+publisher:"King Abdullah University of Science and Technology" +contributor:("Bagci, Hakan")

King Abdullah University of Science and Technology

1. Brambila, Danilo. Quantum-Classical correspondence in nonlinear multidimensional systems: enhanced di usion through soliton wave-particles.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/225111

► Quantum chaos has emerged in the half of the last century with the notorious problem of scattering of heavy nuclei. Since then, theoreticians have developed… (more)

▼ Quantum chaos has emerged in the half of the last century with the notorious problem of scattering of heavy nuclei. Since then, theoreticians have developed powerful techniques to approach disordered quantum systems. In the late 70's, Casati and Chirikov initiated a new field of research by studying the quantum counterpart of classical problems that are known to exhibit chaos. Among the several quantum-classical chaotic systems studied, the kicked rotor stimulated a lot of enthusiasm in the scientific community due to its equivalence to the Anderson tight binding model. This equivalence allows one to map the random Anderson model into a set of fully deterministic equations, making the theoretical analysis of Anderson localization considerably simpler. In the one-dimensional linear regime, it is known that Anderson localization always prevents the diffusion of the momentum. On the other hand, for higher dimensions it was demonstrated that for certain conditions of the disorder parameter, Anderson localized modes can be inhibited, allowing then a phase transition from localized (insulating) to delocalized (metallic) states. In this thesis we will numerically and theoretically investigate the properties of a multidimensional quantum kicked rotor in a nonlinear medium. The presence of nonlinearity is particularly interesting as it raises the possibility of having soliton waves as eigenfunctions of the systems. We keep the generality of our approach by using an adjustable diffusive nonlinearity, which can describe several physical phenomena. By means of Variational Calculus we develop a chaotic map which fully describes the soliton dynamics. The analysis of such a map shows a rich physical scenario that evidences the wave-particle behavior of a soliton. Through the nonlinearity, we trace a correspondence between quantum and classical mechanics, which has no equivalent in linearized systems. Matter waves experiments provide an ideal environment for studying Anderson localization, as the interactions in these systems can be easily controlled by Feshbach resonance techniques. In the end of this thesis, we propose an experimental realization of the kicked rotor in a dipolar Bose Einstein Condensate. Advisors/Committee Members: Fratalocchi, Andrea (advisor), Bagci, Hakan (committee member).

Subjects/Keywords: Solitons; Quantum Chaos; Variational; Anderson Localization

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APA (6^th Edition):

Brambila, D. (2012). Quantum-Classical correspondence in nonlinear multidimensional systems: enhanced di usion through soliton wave-particles. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/225111

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Brambila, Danilo. “Quantum-Classical correspondence in nonlinear multidimensional systems: enhanced di usion through soliton wave-particles.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/225111.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Brambila, Danilo. “Quantum-Classical correspondence in nonlinear multidimensional systems: enhanced di usion through soliton wave-particles.” 2012. Web. 12 Apr 2021.

Vancouver:

Brambila D. Quantum-Classical correspondence in nonlinear multidimensional systems: enhanced di usion through soliton wave-particles. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/225111.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Brambila D. Quantum-Classical correspondence in nonlinear multidimensional systems: enhanced di usion through soliton wave-particles. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/225111

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

2. Sayed, Sadeed B. Transient Electromagnetic Analysis of Complex Penetrable Scatterers using Volume Integral Equations.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/630075

► Simulation tools capable of analyzing electromagnetic (EM) field/wave interactions on complex penetrable scatterers have applications in various areas of engineering ranging from the design of… (more)

▼ Simulation tools capable of analyzing electromagnetic (EM) field/wave interactions on complex penetrable scatterers have applications in various areas of engineering ranging from the design of integrated antennas to the subsurface imaging. EM simulation tools operating in the time domain can be formulated to directly solve the Maxwell equations or the integral equations obtained by enforcing fundamental field relations or boundary conditions. Time domain integral equation (TDIE) solvers offer several benefits over differential equation solvers: They require smaller number discretization elements/sampling points (both in space and time). Despite the advantages, TDIE solvers suffer from increased computational cost, stability issues of the time-marching algorithms, and limited applicability to complex scatterers. This thesis is focused on addressing the last two issues associated with time domain volume integral equation (TD-VIE) solvers, as the issue of increased computational cost has been addressed by recently developed acceleration methods. More specifically, four new closely-related, but different marching on-in-time (MOT) algorithms are formulated and implemented to solve the time domain electric and magnetic field volume integral equations (TD-EFVIE and TD-MFVIE). The first algorithm solves the TD-EFVIE to analyze EM wave interactions on high-contrast dielectric scatterers. The stability of this MOT scheme is ensured by using two-sided approximate prolate spherical wave (APSW) functions to discretize the time dependence of the unknown current density as well as an extrapolation scheme to restore the causality of matrix system resulting from this discretization. The second MOT scheme solves the TDMFVIE to analyze EM wave interactions on dielectric scatterers. The TD-MFVIE is cast in the form of an ordinary differential equation (ODE) and the unknown magnetic field is expanded using spatial basis functions. The time-dependent coefficients of this expansion are found by integrating the resulting ODE system using a linear multistep method. The third method is formulated and implemented to analyze EM wave interactions on scatterers with Kerr nonlinearity. The former scheme integrates in time a coupled of system of the TD-EFVIE and the nonlinear constitutive relation, which is cast in the form of an ODE system, for the expansion coefficients of the electric field and flux using a linear multistep method. The last method described in this thesis is developed to analyze EM wave interactions on ferrite scatterers. Advisors/Committee Members: Bagci, Hakan (advisor), Bagci, Hakan (committee member), Ooi, Boon S. (committee member), Samtaney, Ravi (committee member), Andriulli, Francesco P. (committee member).

Subjects/Keywords: Electromagnetic; Transient; Analysis; Integral Equation; Complex; Scatterers

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APA (6^th Edition):

Sayed, S. B. (2018). Transient Electromagnetic Analysis of Complex Penetrable Scatterers using Volume Integral Equations. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/630075

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sayed, Sadeed B. “Transient Electromagnetic Analysis of Complex Penetrable Scatterers using Volume Integral Equations.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/630075.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sayed, Sadeed B. “Transient Electromagnetic Analysis of Complex Penetrable Scatterers using Volume Integral Equations.” 2018. Web. 12 Apr 2021.

Vancouver:

Sayed SB. Transient Electromagnetic Analysis of Complex Penetrable Scatterers using Volume Integral Equations. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/630075.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sayed SB. Transient Electromagnetic Analysis of Complex Penetrable Scatterers using Volume Integral Equations. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/630075

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

3. Delgado, Edgar. Strong Localization in Disordered Media: Analysis of the Backscattering Cone.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/235651

► A very interesting effect in light propagation through a disordered system is Anderson localization of light, this phenomenon emerges as the result of multiple scattering… (more)

Subjects/Keywords: Localization of Waves; Multiple Scattering; Disorder; Coherent Backscattering; Backscattering cone

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APA (6^th Edition):

Delgado, E. (2012). Strong Localization in Disordered Media: Analysis of the Backscattering Cone. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/235651

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Delgado, Edgar. “Strong Localization in Disordered Media: Analysis of the Backscattering Cone.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/235651.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Delgado, Edgar. “Strong Localization in Disordered Media: Analysis of the Backscattering Cone.” 2012. Web. 12 Apr 2021.

Vancouver:

Delgado E. Strong Localization in Disordered Media: Analysis of the Backscattering Cone. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/235651.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Delgado E. Strong Localization in Disordered Media: Analysis of the Backscattering Cone. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/235651

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

4. Nafe, Ahmed A. Substrate Integrated Waveguide Based Phase Shifter and Phased Array in a Ferrite Low Temperature Co-fired Ceramic Package.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2014, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/314674

► Phased array antennas, capable of controlling the direction of their radiated beam, are demanded by many conventional as well as modern systems. Applications such as… (more)

▼ Phased array antennas, capable of controlling the direction of their radiated beam, are demanded by many conventional as well as modern systems. Applications such as automotive collision avoidance radar, inter-satellite communication links and future man-portable satellite communication on move services require reconfigurable beam systems with stress on mobility and cost effectiveness. Microwave phase shifters are key components of phased antenna arrays. A phase shifter is a device that controls the phase of the signal passing through it. Among the technologies used to realize this device, traditional ferrite waveguide phase shifters offer the best performance. However, they are bulky and difficult to integrate with other system components. Recently, ferrite material has been introduced in Low Temperature Co-fired Ceramic (LTCC) multilayer packaging technology. This enables the integration of ferrite based components with other microwave circuitry in a compact, light-weight and mass producible package. Additionally, the recent concept of Substrate Integrated Waveguide (SIW) allowed realization of synthesized rectangular waveguide-like structures in planar and multilayer substrates. These SIW structures have been shown to maintain the merits of conventional rectangular waveguides such as low loss and high power handling capabilities while being planar and easily integrable with other components. Implementing SIW structures inside a multilayer ferrite LTCC package enables monolithic integration of phase shifters and phased arrays representing a true System on Package (SoP) solution. It is the objective of this thesis to pursue realizing efficient integrated phase shifters and phased arrays combining the above mentioned technologies, namely Ferrite LTCC and SIW. In this work, a novel SIW phase shifter in ferrite LTCC package is designed, fabricated and tested. The device is able to operate reciprocally as well as non-reciprocally. Demonstrating a measured maximum reciprocal phase shift of 132o and maximum non-reciprocal shift of 118o at 12 GHz. Additionally a slotted SIW antenna is designed and integrated with the phase shifter in an array format, demonstrating a beam scanning of ± 15o. The design is highly suitable for mobile automotive radars and satellite communications systems. Advisors/Committee Members: Shamim, Atif (advisor), Bagci, Hakan (committee member), Kosel, Jürgen (committee member).

Subjects/Keywords: Phase Shifter; Sustrate Integrated Waveguide; Ferrite; Phased Antenna Array

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APA (6^th Edition):

Nafe, A. A. (2014). Substrate Integrated Waveguide Based Phase Shifter and Phased Array in a Ferrite Low Temperature Co-fired Ceramic Package. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/314674

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nafe, Ahmed A. “Substrate Integrated Waveguide Based Phase Shifter and Phased Array in a Ferrite Low Temperature Co-fired Ceramic Package.” 2014. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/314674.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nafe, Ahmed A. “Substrate Integrated Waveguide Based Phase Shifter and Phased Array in a Ferrite Low Temperature Co-fired Ceramic Package.” 2014. Web. 12 Apr 2021.

Vancouver:

Nafe AA. Substrate Integrated Waveguide Based Phase Shifter and Phased Array in a Ferrite Low Temperature Co-fired Ceramic Package. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2014. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/314674.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nafe AA. Substrate Integrated Waveguide Based Phase Shifter and Phased Array in a Ferrite Low Temperature Co-fired Ceramic Package. [Thesis]. King Abdullah University of Science and Technology; 2014. Available from: http://hdl.handle.net/10754/314674

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

5. Zhang, Haoran. Gain Enhancement Techniques for mm-wave On-chip Antenna on Lossy CMOS Platforms.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2019, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/644894

► Recently, there is great interest in achieving higher-level integration, higher data rates, and reduced overall costs. At millimeter-wave (mm-wave) bands, the wavelength is small enough… (more)

▼ Recently, there is great interest in achieving higher-level integration, higher data rates, and reduced overall costs. At millimeter-wave (mm-wave) bands, the wavelength is small enough to realize an antenna-on-chip (AoC), which is an ideal solution for high compactness and lower costs. However, the main drawback of AoC is the low resistivity (10 Ω-cm) Si substrate used in the standard CMOS technology, which absorbs most radio-frequency (RF) power that was supposed to be radiated by the on-chip antenna. Moreover, due to the high relative permittivity (11.9) and relatively large electrical thickness of the Si, higher order surface wave modes get excited, which further degrade the antenna radiation performance. In order to alleviate the above-mentioned issues with the low gain of AoC, a combination of an artificial magnetic conductor (AMC) surface, a high dielectric constant superstrate, and a Fresnel lens is presented in this work. The AMC is realized in standard CMOS technology along with the AoC, whereas the superstrate and lens are part of a smart packaging solution. The AMC surface can change wave propagation characteristics at the operating frequency to achieve in-phase reflection, resulting in gain enhancement by reducing the loss in the substrate. The high dielectric constant superstrate behaves as an impedance transformer between the Si substrate and air, thus enhancing the coupling to air. Finally, the Fresnel lens enhances the gain by focusing the electromagnetic (EM) radiation beam at the boresight. For AoC realization, a standard 0.18 μm CMOS process was utilized. A coplanar waveguide (CPW) fed monopole on-chip antenna at 71 GHz, along with the corresponding driving circuit, was designed and fabricated. The AMC enhances the gain by 3 dB. Since the chip needs to be packaged anyways, in this work, we optimize the package to provide further gain enhancement. This smart package, comprising a superstrate and a Fresnel lens, provides a gain enhancement of 16 dB. The overall combination of the optimized AMC surface, superstrate layer, and lens package can provide a gain enhancement of around 19 dB. Furthermore, the package has been realized through additive manufacturing techniques that ensure lower costs for the overall system. Advisors/Committee Members: Shamim, Atif (advisor), Bagci, Hakan (committee member), Wu, Ying (committee member).

Subjects/Keywords: mm-wave; on-chip antenna; gain enhancement

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, H. (2019). Gain Enhancement Techniques for mm-wave On-chip Antenna on Lossy CMOS Platforms. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/644894

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Haoran. “Gain Enhancement Techniques for mm-wave On-chip Antenna on Lossy CMOS Platforms.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/644894.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Haoran. “Gain Enhancement Techniques for mm-wave On-chip Antenna on Lossy CMOS Platforms.” 2019. Web. 12 Apr 2021.

Vancouver:

Zhang H. Gain Enhancement Techniques for mm-wave On-chip Antenna on Lossy CMOS Platforms. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/644894.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang H. Gain Enhancement Techniques for mm-wave On-chip Antenna on Lossy CMOS Platforms. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/644894

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

6. Rafi, Kazi. Device Characterization of High Performance Quantum Dot Comb Laser.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/215949

► The cost effective comb based laser sources are considered to be one of the prominent emitters used in optical communication (OC) and photonic integrated circuits… (more)

Subjects/Keywords: Comb laser; Broadband Laser; Quantum-Dot; Duty cycle; Cavity; Quantum-Dot

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APA (6^th Edition):

Rafi, K. (2012). Device Characterization of High Performance Quantum Dot Comb Laser. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/215949

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rafi, Kazi. “Device Characterization of High Performance Quantum Dot Comb Laser.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/215949.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rafi, Kazi. “Device Characterization of High Performance Quantum Dot Comb Laser.” 2012. Web. 12 Apr 2021.

Vancouver:

Rafi K. Device Characterization of High Performance Quantum Dot Comb Laser. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/215949.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rafi K. Device Characterization of High Performance Quantum Dot Comb Laser. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/215949

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

7. Abuzaid, Hattan. An LTCC Based Compact SIW Antenna Array Feed Network for a Passive Imaging Radiometer.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2013, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/268852

► Passive millimeter-wave (PMMW) imaging is a technique that allows the detection of inherent millimeter-wave radiation emitted by bodies. Since different bodies with varying properties emit… (more)

▼ Passive millimeter-wave (PMMW) imaging is a technique that allows the detection of inherent millimeter-wave radiation emitted by bodies. Since different bodies with varying properties emit unequal power intensities, a contrast can be established to detect their presence. The advantage of this imaging scheme over other techniques, such as optical and infrared imaging, is its ability to operate under all weather conditions. This is because the relatively long wavelengths of millimeter-waves, as compared to visible light, penetrate through clouds, fog, and sandstorms. The core of a PMMW camera is an antenna, which receives the electromagnetic radiation from a scene. Because PMMW systems require high gains to operate, large antenna arrays are typically employed. This mandatory increase of antenna elements is associated with a large feeding network. Therefore, PMMW cameras usually have a big profile. In this work, two enabling technologies, namely, Substrate integrated Waveguide (SIW) and Low Temperature Co-fired Ceramic (LTCC), are coupled with an innovative design to miniaturize the passive front-end. The two technologies synergize very well with the shielded characteristics of SIW and the high density multilayer integration of LTCC. The proposed design involves a novel multilayer power divider, which is incorporated in a folded feed network structure by moving between layers. The end result is an efficient feeding network, which footprint is least affected by an increase in array size. This is because the addition of more elements is accommodated by a vertical expansion rather than a lateral one. To characterize the feed network, an antenna array has been designed and integrated through efficient transitions.The complete structure has been simulated and fabricated. The results demonstrate an excellent performance, manifesting in a gain of 20 dBi and a bandwidth of more than 11.4% at 35 GHz. These values satisfy the general requirements of a PMMW system. Advisors/Committee Members: Shamim, Atif (advisor), Bagci, Hakan (committee member), Foulds, Ian G. (committee member), Shamim, Atif (committee member).

Subjects/Keywords: Antenna Feed Miniturization; PMMW Imaging; STW; LTCC

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APA (6^th Edition):

Abuzaid, H. (2013). An LTCC Based Compact SIW Antenna Array Feed Network for a Passive Imaging Radiometer. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/268852

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Abuzaid, Hattan. “An LTCC Based Compact SIW Antenna Array Feed Network for a Passive Imaging Radiometer.” 2013. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/268852.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Abuzaid, Hattan. “An LTCC Based Compact SIW Antenna Array Feed Network for a Passive Imaging Radiometer.” 2013. Web. 12 Apr 2021.

Vancouver:

Abuzaid H. An LTCC Based Compact SIW Antenna Array Feed Network for a Passive Imaging Radiometer. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2013. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/268852.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Abuzaid H. An LTCC Based Compact SIW Antenna Array Feed Network for a Passive Imaging Radiometer. [Thesis]. King Abdullah University of Science and Technology; 2013. Available from: http://hdl.handle.net/10754/268852

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

8. Amin, Muhammad. Design of Fano Resonators for Novel Metamaterial Applications.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2014, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/316521

► The term “metamaterials” refers to engineered structures that interact with electromagnetic fields in an unusual but controllable way that cannot be observed with natural materials.… (more)

▼ The term “metamaterials” refers to engineered structures that interact with electromagnetic fields in an unusual but controllable way that cannot be observed with natural materials. Metamaterial design at optical frequencies oftentimes makes of controllable plasmonic interactions. Light can excite collective oscillations of conduction band electrons on a metallic nanostructure. These oscillations result in localized surface plasmon modes which can provide high confinement of fields at metal-dielectric interfaces at nanoscale. Additionally scattering and absorption characteristics of plasmon modes can be controlled by geometrical features of the metallic nanostructures. This ease of controllability has lead to the development of new concepts in light manipulation and enhancement of light-material interactions. Fano resonance and plasmonic induced transparency (PIT) are among the most promising of those. The interference between different plasmon modes induced on nanostructures generates PIT/Fano resonance at optical frequencies. The unusual dispersion characteristics observed within the PIT window can be used for designing optical metamaterials to be used in various applications including bio-chemical sensing, slow light, modulation, perfect absorption, and all-optical switching. This thesis focuses on design of novel plasmonic devices to be used in these applications. The fundamental idea behind these designs is the generation of higher-order plasmon modes, which leads to PIT/Fano resonance-like output characteristics. These are then exploited together with dynamic tunability supported by graphene and field enhancement provided by nonlinear materials to prototype novel plasmonic devices. More specifically, this thesis proposes the following plasmonic device designs. I. Nano-disk Fano resonator: Open disk-like plasmonic nanostructures are preferred for bio-chemical sensing because of their higher capacity to be in contact with greater volumes of analyte. High effective refractive index required by sensing applications is achieved though the dispersion characteristics within PIT window. Higher order modes required for Fano resonance are generated through geometrical symmetry breaking by embedding a shifted and elongated cavity into a circular disk. The resulting dual band PIT can be geometrically tuned by varying the cavity's width and rotation angle. II. Tunable Terahertz Fano resonator: The possibility to dynamically tune graphene's conductivity has made it an attractive choice over conventional noble metals to generate surface plasmon modes at Terahertz frequencies. Subsequently, a polarization-independent and dynamically tunable hybrid gold-graphene structure is designed to achieve PIT/Fano resonance by allowing graphene and metallic plasmon modes to interfere. The effective group index of the resulting resonator is found to be very high (ng=1400, several times higher than all previously reported PIT devices) within the PIT window. Dynamic tunability achieved through a gate voltage applied to graphene suggests… Advisors/Committee Members: Bagci, Hakan (advisor), Ooi, Boon S. (committee member), Rockstunl, Carsten (committee member), Wu, Ying (committee member).

Subjects/Keywords: Fano Resonance; Plasmonics; Metamaterials; Electromagnetics

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APA (6^th Edition):

Amin, M. (2014). Design of Fano Resonators for Novel Metamaterial Applications. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/316521

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Amin, Muhammad. “Design of Fano Resonators for Novel Metamaterial Applications.” 2014. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/316521.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Amin, Muhammad. “Design of Fano Resonators for Novel Metamaterial Applications.” 2014. Web. 12 Apr 2021.

Vancouver:

Amin M. Design of Fano Resonators for Novel Metamaterial Applications. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2014. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/316521.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Amin M. Design of Fano Resonators for Novel Metamaterial Applications. [Thesis]. King Abdullah University of Science and Technology; 2014. Available from: http://hdl.handle.net/10754/316521

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

9. Nafe, Mahmoud. Gain-Enhanced On-Chip Antenna Utilizing Artificial Magnetic Conductor Reflecting Surface at 94 GHz.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2015, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/565638

► Nowadays, there is a growing demand for high frequency-bandwidth mm-wave (30-300 GHz) electronic wireless transceiver systems to support applications such as high data-rate wireless communication… (more)

▼ Nowadays, there is a growing demand for high frequency-bandwidth mm-wave (30-300 GHz) electronic wireless transceiver systems to support applications such as high data-rate wireless communication and high resolution imaging. Such mm-wave systems are becoming more feasible due to the extreme transistor downscaling in silicon-based integrated circuits, which enabled densely-integrated high-speed elec- tronics operating up to more than 100 GHz with low fabrication cost. To further enhance system integrability, it is required to implement all wireless system compo- nents on the chip. Presently, the last major barrier to true System-on-Chip (SoC) realization is the antenna implementation on the silicon chip. Although at mm-wave frequencies the antenna size becomes small enough to fit on chip, the antenna performance is greatly deteriorated due the high conductivity and high relative permittivity of the silicon substrate. The negative e↵ects of the silicon substrate could be avoided by using a metallic reflecting surface on top of silicon, which e↵ectively isolates the antenna from the silicon. However, this approach has the shortcoming of having to implement the antenna on the usually very thin silicon oxide layer of a typical CMOS fabrication process (10’s of μm). This forces the antenna to be in a very close proximity (less than one hundredth of a wavelength) to the reflecting surface. In this regime, the use of conventional metallic reflecting surface for silicon shielding has severe e↵ects on the antenna performance as it tends to reduce the antenna radiation resistance resulting in most of the energy being absorbed rather than radiated. In this work, the use of specially patterned reflecting surfaces for improving on- chip antenna performance is investigated. By using a periodic metallic surface on top of a grounded substrate, the structure can mimic the behavior of a perfect mag- netic conductor, hence called Artificial Magnetic Conductor (AMC) surface. Unlike conventional ground plane reflecting surfaces, AMC surfaces generally enhance the radiation and impedance characteristics of close-by antennas. Based on this property, a ring-based AMC reflecting surface has been designed in the oxide layer for on-chip antennas operating at 94 GHz. Furthermore, a folded dipole antenna with its associ- ated planar feeding structures has been optimized and integrated with the developed ring-based AMC surface. The proposed design is then fabricated at KAUST clean- room facilities. Prototype characterization showed very promising results with good correlation to simulations, with the antenna exhibiting an impedance bandwidth of 10% (90-100 GHz) and peak gain of -1.4 dBi, which is the highest gain reported for on-chip antennas at this frequency band without the use of any external o↵-chip components or post-fabrication steps. Advisors/Committee Members: Shamim, Atif (advisor), Salama, Khaled N. (committee member), Bagci, Hakan (committee member).

Subjects/Keywords: one-chip antenna; System-on-chip; artificla magnetic conductor; hight impedence surface; mm-wave

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APA (6^th Edition):

Nafe, M. (2015). Gain-Enhanced On-Chip Antenna Utilizing Artificial Magnetic Conductor Reflecting Surface at 94 GHz. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/565638

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nafe, Mahmoud. “Gain-Enhanced On-Chip Antenna Utilizing Artificial Magnetic Conductor Reflecting Surface at 94 GHz.” 2015. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/565638.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nafe, Mahmoud. “Gain-Enhanced On-Chip Antenna Utilizing Artificial Magnetic Conductor Reflecting Surface at 94 GHz.” 2015. Web. 12 Apr 2021.

Vancouver:

Nafe M. Gain-Enhanced On-Chip Antenna Utilizing Artificial Magnetic Conductor Reflecting Surface at 94 GHz. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2015. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/565638.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nafe M. Gain-Enhanced On-Chip Antenna Utilizing Artificial Magnetic Conductor Reflecting Surface at 94 GHz. [Thesis]. King Abdullah University of Science and Technology; 2015. Available from: http://hdl.handle.net/10754/565638

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

10. Berdahl, J. Scott. Geological Effects on Lightning Strike Distributions.

Degree: Physical Science and Engineering (PSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/610555

► Recent advances in lightning detection networks allow for detailed mapping of lightning flash locations. Longstanding rumors of geological influence on cloud-to-ground (CG) lightning distribution and… (more)

Subjects/Keywords: Lightning; Geology; Spatial statistics; Conductivity

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APA (6^th Edition):

Berdahl, J. S. (2016). Geological Effects on Lightning Strike Distributions. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/610555

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Berdahl, J Scott. “Geological Effects on Lightning Strike Distributions.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/610555.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Berdahl, J Scott. “Geological Effects on Lightning Strike Distributions.” 2016. Web. 12 Apr 2021.

Vancouver:

Berdahl JS. Geological Effects on Lightning Strike Distributions. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/610555.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Berdahl JS. Geological Effects on Lightning Strike Distributions. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/610555

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

11. Ghaffar, Farhan A. Theory and Design of Tunable and Reconfigurable Microwave Passive Components on Partially Magnetized Ferrite Substrate.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/621876

► Typical microwave components such as antennas are large in size and occupy considerable space. Since multiple standards are utilized in modern day systems and thus… (more)

▼ Typical microwave components such as antennas are large in size and occupy considerable space. Since multiple standards are utilized in modern day systems and thus multiple antennas are required, it is best if a single component can be reconfigured or tuned to various bands. Similarly phase shifters to provide beam scanning and polarization reconfigurable antennas are important for modern day congested wireless systems. Tunability of antennas or phase shifting between antenna elements has been demonstrated using various techniques which include magnetically tunable components on ferrite based substrates. Although this method has shown promising results it also has several issues due to the use of large external electromagnets and operation in the magnetically saturated state. These issues include the device being bulky, inefficient, non-integrable and expensive. In this thesis, we have tried to resolve the above mentioned issues of large size and large power requirement by replacing the large electromagnets with embedded bias windings and also by operating the ferrites in the partially magnetized state. New theoretical models and simulation methodology have been used to evaluate the performance of the microwave passive components in the partially magnetized state. A multilayer ferrite Low Temperature Cofired Ceramic (LTCC) tape system has been used to verify the performance experimentally. There exists a good agreement between the theoretical, simulation and measurement results. Tunable antennas with tuning range of almost 10 % and phase shifter with an FoM of 83.2/dB have been demonstrated in this work, however the major contribution is that this has been achieved with bias fields that are 90 % less than the typically reported values in the literature. Finally, polarization reconfigurability has also been demonstrated for a circular patch antenna using a low cost additive manufacturing technique. The results are promising and indicate that highly integrated ferrite based tunable components are feasible in small form factor, without the need of the large electromagnets and coils, and thus can be operated at very low bias levels as compared to the ones which are operated in the saturated state with external bias mechanisms. Advisors/Committee Members: Shamim, Atif (advisor), Bagci, Hakan (committee member), Wu, Ying (committee member), Swaminathan, Madhavan (committee member).

Subjects/Keywords: Ferrite LTCC; Tunable; Reconfigurable; Microwave components; Partially magnetized

11 more images…

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APA (6^th Edition):

Ghaffar, F. A. (2016). Theory and Design of Tunable and Reconfigurable Microwave Passive Components on Partially Magnetized Ferrite Substrate. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/621876

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ghaffar, Farhan A. “Theory and Design of Tunable and Reconfigurable Microwave Passive Components on Partially Magnetized Ferrite Substrate.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/621876.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ghaffar, Farhan A. “Theory and Design of Tunable and Reconfigurable Microwave Passive Components on Partially Magnetized Ferrite Substrate.” 2016. Web. 12 Apr 2021.

Vancouver:

Ghaffar FA. Theory and Design of Tunable and Reconfigurable Microwave Passive Components on Partially Magnetized Ferrite Substrate. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/621876.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ghaffar FA. Theory and Design of Tunable and Reconfigurable Microwave Passive Components on Partially Magnetized Ferrite Substrate. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/621876

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

12. Uysal, Ismail Enes. Time Domain Surface Integral Equation Solvers for Quantum Corrected Electromagnetic Analysis of Plasmonic Nanostructures.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/621891

► Plasmonic structures are utilized in many applications ranging from bio-medicine to solar energy generation and transfer. Numerical schemes capable of solving equations of classical electrodynamics… (more)

▼ Plasmonic structures are utilized in many applications ranging from bio-medicine to solar energy generation and transfer. Numerical schemes capable of solving equations of classical electrodynamics have been the method of choice for characterizing scattering properties of such structures. However, as dimensions of these plasmonic structures reduce to nanometer scale, quantum mechanical effects start to appear. These effects cannot be accurately modeled by available classical numerical methods. One of these quantum effects is the tunneling, which is observed when two structures are located within a sub-nanometer distance of each other. At these small distances electrons “jump" from one structure to another and introduce a path for electric current to flow. Classical equations of electrodynamics and the schemes used for solving them do not account for this additional current path. This limitation can be lifted by introducing an auxiliary tunnel with material properties obtained using quantum models and applying a classical solver to the structures connected by this auxiliary tunnel. Early work on this topic focused on quantum models that are generated using a simple one-dimensional wave function to find the tunneling probability and assume a simple Drude model for the permittivity of the tunnel. These tunnel models are then used together with a classical frequency domain solver. In this thesis, a time domain surface integral equation solver for quantum corrected analysis of transient plasmonic interactions is proposed. This solver has several advantages: (i) As opposed to frequency domain solvers, it provides results at a broad band of frequencies with a single simulation. (ii) As opposed to differential equation solvers, it only discretizes surfaces (reducing number of unknowns), enforces the radiation condition implicitly (increasing the accuracy), and allows for time step selection independent of spatial discretization (increasing efficiency). The quantum model of the tunnel is obtained using density functional theory (DFT) computations, which account for the atomic structure of materials. Accuracy and applicability of this (quantum corrected) time domain surface integral equation solver will be shown by numerical examples. Advisors/Committee Members: Bagci, Hakan (advisor), Ooi, Boon S. (committee member), Schwingenschlögl, Udo (committee member), Balasubramaniam, Shanker (committee member).

Subjects/Keywords: Plasmonics; Time-domain; Quantum-tunneling; Integral-equation

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APA (6^th Edition):

Uysal, I. E. (2016). Time Domain Surface Integral Equation Solvers for Quantum Corrected Electromagnetic Analysis of Plasmonic Nanostructures. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/621891

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Uysal, Ismail Enes. “Time Domain Surface Integral Equation Solvers for Quantum Corrected Electromagnetic Analysis of Plasmonic Nanostructures.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/621891.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Uysal, Ismail Enes. “Time Domain Surface Integral Equation Solvers for Quantum Corrected Electromagnetic Analysis of Plasmonic Nanostructures.” 2016. Web. 12 Apr 2021.

Vancouver:

Uysal IE. Time Domain Surface Integral Equation Solvers for Quantum Corrected Electromagnetic Analysis of Plasmonic Nanostructures. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/621891.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Uysal IE. Time Domain Surface Integral Equation Solvers for Quantum Corrected Electromagnetic Analysis of Plasmonic Nanostructures. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/621891

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

13. Abdelaziz, Ibrahim. Scalable Discovery and Analytics on Web Linked Data.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/628043

► Resource Description Framework (RDF) provides a simple way for expressing facts across the web, leading to Web linked data. Several distributed and federated RDF systems… (more)

▼ Resource Description Framework (RDF) provides a simple way for expressing facts across the web, leading to Web linked data. Several distributed and federated RDF systems have emerged to handle the massive amounts of RDF data available nowadays. Distributed systems are optimized to query massive datasets that appear as a single graph, while federated systems are designed to query hundreds of decentralized and interlinked graphs. This thesis starts with a comprehensive experimental study of the state-of-the-art RDF systems. It identifies a set of research problems for improving the state-of-the-art, including: supporting the emerging RDF analytics required by many modern applications, querying linked data at scale, and enabling discovery on linked data. Addressing these problems is the focus of this thesis. First, we propose Spartex; a versatile framework for complex RDF analytics. Spartex extends SPARQL to seamlessly combine generic graph algorithms with SPARQL queries. Spartex implements a generic SPARQL operator as a vertex-centric program that interprets SPARQL queries and executes them efficiently using a built-in optimizer. We demonstrate that Spartex scales to datasets with billions of edges, and is at least as fast as the state-of-the-art specialized RDF engines. For analytical tasks, Spartex is an order of magnitude faster than existing alternatives. To address the scalability limitation of federated RDF engines, we propose Lusail; a scalable system for querying geo-distributed RDF graphs. Lusail follows a two-tier strategy: (i) locality-aware decomposition of the query into subqueries to maximize the computations at the endpoints and minimize intermediary results, and (ii) selectivity-aware execution to reduce network latency and increase parallelism. Our experiments on billions of triples show that Lusail outperforms existing systems by orders of magnitude in scalability and response time. Finally, enabling discovery on linked data is challenging due to the prior knowledge required to formulate SPARQL queries. To address these challenges; we develop novel techniques to (i) predict semantically equivalent SPARQL queries from a set of keywords by leveraging word embeddings, and (ii) generate fine-grained and non-blocking query plans to get fast and early results. Advisors/Committee Members: Kalnis, Panos (advisor), Canini, Marco (committee member), Bagci, Hakan (committee member), Renz, Matthias (committee member).

Subjects/Keywords: Graph Analytics; Linked Data; RDF; SPARQL; Data Discovery

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APA (6^th Edition):

Abdelaziz, I. (2018). Scalable Discovery and Analytics on Web Linked Data. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/628043

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Abdelaziz, Ibrahim. “Scalable Discovery and Analytics on Web Linked Data.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/628043.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Abdelaziz, Ibrahim. “Scalable Discovery and Analytics on Web Linked Data.” 2018. Web. 12 Apr 2021.

Vancouver:

Abdelaziz I. Scalable Discovery and Analytics on Web Linked Data. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/628043.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Abdelaziz I. Scalable Discovery and Analytics on Web Linked Data. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/628043

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

14. Agambayev, Agamyrat. Design, fabrication and application of fractional-order capacitors.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2019, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/631276

► The fractional–order capacitors add an additional degree of freedom over conventional capacitors in circuit design and facilitate circuit configurations that would be impractical or impossible… (more)

Subjects/Keywords: Fractional-order Capacity; Nanocomposite; Constant phase element; Bilayer Polymer; PVDF

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APA (6^th Edition):

Agambayev, A. (2019). Design, fabrication and application of fractional-order capacitors. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/631276

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Agambayev, Agamyrat. “Design, fabrication and application of fractional-order capacitors.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/631276.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Agambayev, Agamyrat. “Design, fabrication and application of fractional-order capacitors.” 2019. Web. 12 Apr 2021.

Vancouver:

Agambayev A. Design, fabrication and application of fractional-order capacitors. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/631276.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Agambayev A. Design, fabrication and application of fractional-order capacitors. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/631276

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

15. Alharthi, Noha. Fast High-order Integral Equation Solvers for Acoustic and Electromagnetic Scattering Problems.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2019, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/660105

► Acoustic and electromagnetic scattering from arbitrarily shaped structures can be numerically characterized by solving various surface integral equations (SIEs). One of the most effective techniques… (more)

▼ Acoustic and electromagnetic scattering from arbitrarily shaped structures can be numerically characterized by solving various surface integral equations (SIEs). One of the most effective techniques to solve SIEs is the Nyström method. Compared to other existing methods,the Nyström method is easier to implement especially when the geometrical discretization is non-conforming and higher-order representations of the geometry and unknowns are desired. However,singularities of the Green’s function are more difﬁcult to”manage”since they are not ”smoothened” through the use of a testing function. This dissertation describes purely numerical schemes to account for different orders of singularities that appear in acoustic and electromagnetic SIEs when they are solved by a high-order Nyström method utilizing a mesh of curved discretization elements. These schemes make use of two sets of basis functions to smoothen singular integrals: the grid robust high-order Lagrange and the high-order Silvester-Lagrange interpolation basis functions. Numerical results comparing the convergence of two schemes are presented. Moreover, an extremely scalable implementation of fast multipole method (FMM) is developed to efﬁciently (and iteratively) solve the linear system resulting from the discretization of the acoustic SIEs by the Nyström method. The implementation results in O(N log N) complexity for high-frequency scattering problems. This FMM-accelerated solver can handle N =2 billion on a 200,000-core Cray XC40 with 85% strong scaling efﬁciency. Iterative solvers are often ineffective for ill-conditioned problems. Thus, a fast direct (LU)solver,which makes use of low-rank matrix approximations,is also developed. This solver relies on tile low rank (TLR) data compression format, as implemented in the hierarchical computations on many corearchitectures (HiCMA) library. This requires to taskify the underlying SIE kernels to expose ﬁne-grained computations. The resulting asynchronous execution permit to weaken the artifactual synchronization points,while mitigating the overhead of data motion. We compare the obtained performance results of our TLRLU factorization against the state-of-the-art dense factorizations on shared memory systems. We achieve up to a fourfold performance speedup on a 3D acoustic problem with up to 150 K unknowns in double complex precision arithmetics. Advisors/Committee Members: Keyes, David E. (advisor), Hadwiger, Markus (committee member), Bagci, Hakan (committee member), Kressner, Daniel (committee member).

Subjects/Keywords: Boundary Integral Equation; Acoustic Scattering; LU-Based Solver; Fast Solvers; Fast Multipole Solvers; Tile Low-Rank Approximations

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APA (6^th Edition):

Alharthi, N. (2019). Fast High-order Integral Equation Solvers for Acoustic and Electromagnetic Scattering Problems. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/660105

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alharthi, Noha. “Fast High-order Integral Equation Solvers for Acoustic and Electromagnetic Scattering Problems.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/660105.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alharthi, Noha. “Fast High-order Integral Equation Solvers for Acoustic and Electromagnetic Scattering Problems.” 2019. Web. 12 Apr 2021.

Vancouver:

Alharthi N. Fast High-order Integral Equation Solvers for Acoustic and Electromagnetic Scattering Problems. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/660105.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alharthi N. Fast High-order Integral Equation Solvers for Acoustic and Electromagnetic Scattering Problems. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/660105

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

16. Celis Sierra, Sebastian. INDEX MODULATION USING RECONFIGURABLE ARRAYS.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2020, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/662524

► Communication systems have remained almost unchanged since the invention of the superheterodyne receiver in 1918 by the US engineer Edwin Armstrong. With the introduction of… (more)

Subjects/Keywords: Antennas; communications; index modulation; tunable; wireless channel

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APA (6^th Edition):

Celis Sierra, S. (2020). INDEX MODULATION USING RECONFIGURABLE ARRAYS. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/662524

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Celis Sierra, Sebastian. “INDEX MODULATION USING RECONFIGURABLE ARRAYS.” 2020. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/662524.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Celis Sierra, Sebastian. “INDEX MODULATION USING RECONFIGURABLE ARRAYS.” 2020. Web. 12 Apr 2021.

Vancouver:

Celis Sierra S. INDEX MODULATION USING RECONFIGURABLE ARRAYS. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/662524.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Celis Sierra S. INDEX MODULATION USING RECONFIGURABLE ARRAYS. [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/662524

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

17. Sandhu, Ali Imran. Efficient and Accurate Numerical Techniques for Sparse Electromagnetic Imaging.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2020, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/662627

► Electromagnetic (EM) imaging schemes are inherently non-linear and ill-posed. Albeit there exist remedies to these fundamental problems, more efficient solutions are still being sought. To… (more)

▼ Electromagnetic (EM) imaging schemes are inherently non-linear and ill-posed. Albeit there exist remedies to these fundamental problems, more efficient solutions are still being sought. To this end, in this thesis, the non-linearity is tackled in- corporating a multitude of techniques (ranging from Born approximation (linear), inexact Newton (linearized) to complete nonlinear iterative Landweber schemes) that can account for weak to strong scattering problems. The ill-posedness of the EM inverse scattering problem is circumvented by formulating the above methods into a minimization problem with a sparsity constraint. More specifically, four novel in- verse scattering schemes are formulated and implemented. (i) A greedy algorithm is used together with a simple artificial neural network (ANN) for efficient and accu- rate EM imaging of weak scatterers. The ANN is used to predict the sparsity level of the investigation domain which is then used as the L0 - constraint parameter for the greedy algorithm. (ii) An inexact Newton scheme that enforces the sparsity con- straint on the derivative of the unknown material properties (not necessarily sparse) is proposed. The inverse scattering problem is formulated as a nonlinear function of the derivative of the material properties. This approach results in significant spar- sification where any sparsity regularization method could be efficiently applied. (iii) A sparsity regularized nonlinear contrast source (CS) framework is developed to di- rectly solve the nonlinear minimization problem using Landweber iterations where the convergence is accelerated using a self-adaptive projected accelerated steepest descent algorithm. (iv) A 2.5D finite difference frequency domain (FDFD) based in- verse scattering scheme is developed for imaging scatterers embedded in lossy and inhomogeneous media. The FDFD based inversion algorithm does not require the Green’s function of the background medium and appears a promising technique for biomedical and subsurface imaging with a reasonable computational time. Numerical experiments, which are carried out using synthetically generated mea- surements, show that the images recovered by these sparsity-regularized methods are sharper and more accurate than those produced by existing methods. The methods developed in this work have potential application areas ranging from oil/gas reservoir engineering to biological imaging where sparse domains naturally exist. Advisors/Committee Members: Bagci, Hakan (advisor), Ooi, Boon S. (committee member), Hoteit, Ibrahim (committee member), Dorn, Oliver (committee member).

Subjects/Keywords: Electromagnetic inverse scattering; Inverse problems; Sparsity regularization; Microwave imaging; Accelerated steepest descent; Artificial neural network

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sandhu, A. I. (2020). Efficient and Accurate Numerical Techniques for Sparse Electromagnetic Imaging. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/662627

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sandhu, Ali Imran. “Efficient and Accurate Numerical Techniques for Sparse Electromagnetic Imaging.” 2020. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/662627.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sandhu, Ali Imran. “Efficient and Accurate Numerical Techniques for Sparse Electromagnetic Imaging.” 2020. Web. 12 Apr 2021.

Vancouver:

Sandhu AI. Efficient and Accurate Numerical Techniques for Sparse Electromagnetic Imaging. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/662627.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sandhu AI. Efficient and Accurate Numerical Techniques for Sparse Electromagnetic Imaging. [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/662627

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

18. Desmal, Abdulla. Sparse Reconstruction Schemes for Nonlinear Electromagnetic Imaging.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/602275

► Electromagnetic imaging is the problem of determining material properties from scattered fields measured away from the domain under investigation. Solving this inverse problem is a… (more)

▼ Electromagnetic imaging is the problem of determining material properties from scattered fields measured away from the domain under investigation. Solving this inverse problem is a challenging task because (i) it is ill-posed due to the presence of (smoothing) integral operators used in the representation of scattered fields in terms of material properties, and scattered fields are obtained at a finite set of points through noisy measurements; and (ii) it is nonlinear simply due the fact that scattered fields are nonlinear functions of the material properties. The work described in this thesis tackles the ill-posedness of the electromagnetic imaging problem using sparsity-based regularization techniques, which assume that the scatterer(s) occupy only a small fraction of the investigation domain. More specifically, four novel imaging methods are formulated and implemented. (i) Sparsity-regularized Born iterative method iteratively linearizes the nonlinear inverse scattering problem and each linear problem is regularized using an improved iterative shrinkage algorithm enforcing the sparsity constraint. (ii) Sparsity-regularized nonlinear inexact Newton method calls for the solution of a linear system involving the Frechet derivative matrix of the forward scattering operator at every iteration step. For faster convergence, the solution of this matrix system is regularized under the sparsity constraint and preconditioned by leveling the matrix singular values. (iii) Sparsity-regularized nonlinear Tikhonov method directly solves the nonlinear minimization problem using Landweber iterations, where a thresholding function is applied at every iteration step to enforce the sparsity constraint. (iv) This last scheme is accelerated using a projected steepest descent method when it is applied to three-dimensional investigation domains. Projection replaces the thresholding operation and enforces the sparsity constraint. Numerical experiments, which are carried out using synthetically generated or actually measured scattered fields, show that the images recovered by these sparsity-regularized methods are sharper and more accurate than those produced by existing methods. The methods developed in this work have potential application areas ranging from oil/gas reservoir engineering to biological imaging where sparse domains naturally exist. Advisors/Committee Members: Bagci, Hakan (advisor), Al-Naffouri, Tareq Y. (committee member), Hoteit, Ibrahim (committee member), Moghaddam, Mahta (committee member).

Subjects/Keywords: Sparse reconstruction; Inverse scattering; Electromagnetic (EM) imaging; Nonlinear optimization; Linear Optimization; Reqularization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Desmal, A. (2016). Sparse Reconstruction Schemes for Nonlinear Electromagnetic Imaging. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/602275

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Desmal, Abdulla. “Sparse Reconstruction Schemes for Nonlinear Electromagnetic Imaging.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/602275.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Desmal, Abdulla. “Sparse Reconstruction Schemes for Nonlinear Electromagnetic Imaging.” 2016. Web. 12 Apr 2021.

Vancouver:

Desmal A. Sparse Reconstruction Schemes for Nonlinear Electromagnetic Imaging. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/602275.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Desmal A. Sparse Reconstruction Schemes for Nonlinear Electromagnetic Imaging. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/602275

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

19. Ibeid, Huda. Fast Multipole-Based Elliptic PDE Solver and Preconditioner.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/621993

► Exascale systems are predicted to have approximately one billion cores, assuming Gigahertz cores. Limitations on affordable network topologies for distributed memory systems of such massive… (more)

▼ Exascale systems are predicted to have approximately one billion cores, assuming Gigahertz cores. Limitations on affordable network topologies for distributed memory systems of such massive scale bring new challenges to the currently dominant parallel programing model. Currently, there are many efforts to evaluate the hardware and software bottlenecks of exascale designs. It is therefore of interest to model application performance and to understand what changes need to be made to ensure extrapolated scalability. Fast multipole methods (FMM) were originally developed for accelerating N-body problems for particle-based methods in astrophysics and molecular dynamics. FMM is more than an N-body solver, however. Recent efforts to view the FMM as an elliptic PDE solver have opened the possibility to use it as a preconditioner for even a broader range of applications. In this thesis, we (i) discuss the challenges for FMM on current parallel computers and future exascale architectures, with a focus on inter-node communication, and develop a performance model that considers the communication patterns of the FMM for spatially quasi-uniform distributions, (ii) employ this performance model to guide performance and scaling improvement of FMM for all-atom molecular dynamics simulations of uniformly distributed particles, and (iii) demonstrate that, beyond its traditional use as a solver in problems for which explicit free-space kernel representations are available, the FMM has applicability as a preconditioner in finite domain elliptic boundary value problems, by equipping it with boundary integral capability for satisfying conditions at finite boundaries and by wrapping it in a Krylov method for extensibility to more general operators. Compared with multilevel methods, FMM is capable of comparable algebraic convergence rates down to the truncation error of the discretized PDE, and it has superior multicore and distributed memory scalability properties on commodity architecture supercomputers. Compared with other methods exploiting the low rank character of off-diagonal blocks of the dense resolvent operator, FMM-preconditioned Krylov iteration may reduce the amount of communication because it is matrix-free and exploits the tree structure of FMM. Fast multipole-based solvers and preconditioners are demonstrably poised to play a leading role in exascale computing. Advisors/Committee Members: Keyes, David E. (advisor), Bagci, Hakan (committee member), Gao, Xin (committee member), Yokota, Rio (committee member), Gropp, William D. (committee member).

Subjects/Keywords: Fast Multiple Method; Performance modeling; Boundary element method; Preconditioning

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ibeid, H. (2016). Fast Multipole-Based Elliptic PDE Solver and Preconditioner. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/621993

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ibeid, Huda. “Fast Multipole-Based Elliptic PDE Solver and Preconditioner.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/621993.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ibeid, Huda. “Fast Multipole-Based Elliptic PDE Solver and Preconditioner.” 2016. Web. 12 Apr 2021.

Vancouver:

Ibeid H. Fast Multipole-Based Elliptic PDE Solver and Preconditioner. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/621993.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ibeid H. Fast Multipole-Based Elliptic PDE Solver and Preconditioner. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/621993

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

20. Zhang, Xiujuan. Effective Medium Theory for Anisotropic Metamaterials.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2017, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/626171

► This dissertation includes the study of effective medium theories (EMTs) and their applications in describing wave propagation in anisotropic metamaterials, which can guide the design… (more)

▼ This dissertation includes the study of effective medium theories (EMTs) and their applications in describing wave propagation in anisotropic metamaterials, which can guide the design of metamaterials. An EMT based on field averaging is proposed to describe a peculiar anisotropic dispersion relation that is linear along the symmetry line but quadratic in the perpendicular direction. This dispersion relation is associated with the topological transition of the iso-frequency contours (IFCs), suggesting interesting wave propagation behaviors from beam shaping to beam splitting. In the framework of coherent potential approximation, an analytical EMT is further developed, with the ability to build a direct connection between the microscopic structure and the macroscopic material properties, which overcomes the requirement of prior knowledge of the field distributions. The derived EMT is valid beyond the long-wavelength limit. Using the EMT, an anisotropic zero-index metamaterial is designed. Moreover, the derived EMT imposes a condition that no scattered wave is generated in the ambient medium, which suggests the input signal cannot detect any object that might exist, making it invisible. Such correspondence between the EMT and the invisibilityinspires us to explore the wave cloaking in the same framework of coherent potential approximation. To further broaden the application realm of EMT, an EMT using the parameter retrieval method is studied in the regimes where the previously-developed EMTs are no longer accurate. Based on this study, in conjunction with the EMT mentioned above, a general scheme to realize coherent perfect absorption (CPA) in anisotropic metamaterials is proposed. As an exciting area in metamaterials, the field of metasurfaces has drawn great attention recently. As an easily attainable device, a grating may be the simplest version of metasurfaces. Here, an analytical EMT for gratings made of cylinders is developed by using the multiple scattering theory (MST) method and the lattice sum. Validation of the theory is verified by the agreement between the EMT predictions and the numerical calculations. It is found the EMT is capable of accurately predicting the wave transport behaviors, even for frequencies where the Mie resonances happen. Advisors/Committee Members: Wu, Ying (advisor), Ketcheson, David I. (committee member), Bagci, Hakan (committee member), Chang, Yia-Chung (committee member).

Subjects/Keywords: Effective Medium Theory; Anisotropic Metamaterials; wave cloaking; wave absorption; grating structure

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APA (6^th Edition):

Zhang, X. (2017). Effective Medium Theory for Anisotropic Metamaterials. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/626171

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Xiujuan. “Effective Medium Theory for Anisotropic Metamaterials.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/626171.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Xiujuan. “Effective Medium Theory for Anisotropic Metamaterials.” 2017. Web. 12 Apr 2021.

Vancouver:

Zhang X. Effective Medium Theory for Anisotropic Metamaterials. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/626171.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang X. Effective Medium Theory for Anisotropic Metamaterials. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/626171

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

21. Bakytbekov, Azamat. Fully Printed 3D Cube Cantor Fractal Rectenna for Ambient RF Energy Harvesting Application.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2017, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/626269

► Internet of Things (IoT) is a new emerging paradigm which requires billions of wirelessly connected devices that communicate with each other in a complex radio-frequency… (more)

Subjects/Keywords: RF energy harvesting; Fractal antenna; Multiband antenna; Multiband rectifier; Multiband impedance matching

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APA (6^th Edition):

Bakytbekov, A. (2017). Fully Printed 3D Cube Cantor Fractal Rectenna for Ambient RF Energy Harvesting Application. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/626269

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bakytbekov, Azamat. “Fully Printed 3D Cube Cantor Fractal Rectenna for Ambient RF Energy Harvesting Application.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/626269.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bakytbekov, Azamat. “Fully Printed 3D Cube Cantor Fractal Rectenna for Ambient RF Energy Harvesting Application.” 2017. Web. 12 Apr 2021.

Vancouver:

Bakytbekov A. Fully Printed 3D Cube Cantor Fractal Rectenna for Ambient RF Energy Harvesting Application. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/626269.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bakytbekov A. Fully Printed 3D Cube Cantor Fractal Rectenna for Ambient RF Energy Harvesting Application. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/626269

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

22. Abduljabbar, Mustafa. Communication Reducing Approaches and Shared-Memory Optimizations for the Hierarchical Fast Multipole Method on Distributed and Many-core Systems.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2018, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/630221

► We present algorithms and implementations that overcome obstacles in the migration of the Fast Multipole Method (FMM), one of the most important algorithms in computational… (more)

▼ We present algorithms and implementations that overcome obstacles in the migration of the Fast Multipole Method (FMM), one of the most important algorithms in computational science and engineering, to exascale computing. Emerging architectural approaches to exascale computing are all characterized by data movement rates that are slow relative to the demand of aggregate floating point capability, resulting in performance that is bandwidth limited. Practical parallel applications of FMM are impeded in their scaling by irregularity of domains and dominance of collective tree communication, which is known not to scale well. We introduce novel ideas that improve partitioning of the N-body problem with boundary distribution through a sampling-based mechanism that hybridizes two well-known partitioning techniques, Hashed Octree (HOT) and Orthogonal Recursive Bisection (ORB). To reduce communication cost, we employ two methodologies. First, we directly utilize features available in parallel runtime systems to enable asynchronous computing and overlap it with communication. Second, we present Hierarchical Sparse Data Exchange (HSDX), a new all-to-all algorithm that inherently relieves communication by relaying sparse data in a few steps of neighbor exchanges. HSDX exhibits superior scalability and improves relative performance compared to the default MPI alltoall and other relevant literature implementations. We test this algorithm alongside others on a Cray XC40 tightly coupled with the Aries network and on Intel Many Integrated Core Architecture (MIC) represented by Intel Knights Corner (KNC) and Intel Knights Landing (KNL) as modern shared-memory CPU environments. Tests include comparisons of thoroughly tuned handwritten versus auto-vectorization of FMM Particle-to-Particle (P2P) and Multipole-to-Local (M2L) kernels. Scalability of task-based parallelism is assessed with FMM’s tree traversal kernel using different threading libraries. The MIC tests show large performance gains after adopting the prescribed techniques, which are inevitable in a world that is moving towards many-core parallelism. Advisors/Committee Members: Keyes, David E. (advisor), Bagci, Hakan (committee member), Hadwiger, Markus (committee member), Gropp, William D. (committee member).

Subjects/Keywords: N-Body Method; fast multipole method; hight-performance computing; HSDX algorithm; domain decomposition; MPI+X+Y Parallelism

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Abduljabbar, M. (2018). Communication Reducing Approaches and Shared-Memory Optimizations for the Hierarchical Fast Multipole Method on Distributed and Many-core Systems. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/630221

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Abduljabbar, Mustafa. “Communication Reducing Approaches and Shared-Memory Optimizations for the Hierarchical Fast Multipole Method on Distributed and Many-core Systems.” 2018. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/630221.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Abduljabbar, Mustafa. “Communication Reducing Approaches and Shared-Memory Optimizations for the Hierarchical Fast Multipole Method on Distributed and Many-core Systems.” 2018. Web. 12 Apr 2021.

Vancouver:

Abduljabbar M. Communication Reducing Approaches and Shared-Memory Optimizations for the Hierarchical Fast Multipole Method on Distributed and Many-core Systems. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2018. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/630221.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Abduljabbar M. Communication Reducing Approaches and Shared-Memory Optimizations for the Hierarchical Fast Multipole Method on Distributed and Many-core Systems. [Thesis]. King Abdullah University of Science and Technology; 2018. Available from: http://hdl.handle.net/10754/630221

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

23. Al Farhan, Mohammed. Unstructured Computations on Emerging Architectures.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2019, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/644902

► This dissertation describes detailed performance engineering and optimization of an unstructured computational aerodynamics software system with irregular memory accesses on various multi- and many-core emerging… (more)

▼ This dissertation describes detailed performance engineering and optimization of an unstructured computational aerodynamics software system with irregular memory accesses on various multi- and many-core emerging high performance computing scalable architectures, which are expected to be the building blocks of energy-austere exascale systems, and on which algorithmic- and architecture-oriented optimizations are essential for achieving worthy performance. We investigate several state-of-the-practice shared-memory optimization techniques applied to key kernels for the important problem class of unstructured meshes. We illustrate for a broad spectrum of emerging microprocessor architectures as representatives of the compute units in contemporary leading supercomputers, identifying and addressing performance challenges without compromising the floating-point numerics of the original code. While the linear algebraic kernels are bottlenecked by memory bandwidth for even modest numbers of hardware cores sharing a common address space, the edge-based loop kernels, which arise in the control volume discretization of the conservation law residuals and in the formation of the preconditioner for the Jacobian by finite-differencing the conservation law residuals, are compute-intensive and effectively exploit contemporary multi- and many-core processing hardware. We therefore employ low- and high-level algorithmic- and architecture-specific code optimizations and tuning in light of thread- and data-level parallelism, with a focus on strong thread scaling at the node-level. Our approaches are based upon novel multi-level hierarchical workload distribution mechanisms of data across different compute units (from the address space down to the registers) within every hardware core. We analyze the demonstrated aerodynamics application on specific computing architectures to develop certain performance metrics and models to bespeak the upper and lower bounds of the performance. We present significant full application speedup relative to the baseline code, on a succession of many-core processor architectures, i.e., Intel Xeon Phi Knights Corner (5.0x) and Knights Landing (2.9x). In addition, the performance of Knights Landing outperforms, at significantly lower power consumption, Intel Xeon Skylake with nearly twofold speedup. These optimizations are expected to be of value for many other unstructured mesh partial differential equation-based scientific applications as multi- and many- core architecture evolves. Advisors/Committee Members: Keyes, David E. (advisor), Moshkov, Mikhail (committee member), Hadwiger, Markus (committee member), Bagci, Hakan (committee member), Chow, Edmond (committee member).

Subjects/Keywords: Performance Optimizations; Thread-level parallelism; Data-level parallelism; Unstructured Grids; Computational Aerodynamics; Intel Xeon Phi

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Al Farhan, M. (2019). Unstructured Computations on Emerging Architectures. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/644902

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Al Farhan, Mohammed. “Unstructured Computations on Emerging Architectures.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/644902.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Al Farhan, Mohammed. “Unstructured Computations on Emerging Architectures.” 2019. Web. 12 Apr 2021.

Vancouver:

Al Farhan M. Unstructured Computations on Emerging Architectures. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/644902.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Al Farhan M. Unstructured Computations on Emerging Architectures. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/644902

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

24. Su, Zhen. 3D Near Isotropic Antenna in Package for IoT Applications.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2020, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/665969

► Internet of Things (IoT) is an emerging paradigm about building a massive internet to link billions of non-living things to make smart decisions for humans… (more)

▼ Internet of Things (IoT) is an emerging paradigm about building a massive internet to link billions of non-living things to make smart decisions for humans and improve their quality of life. For many of IoT devices, such as wireless sensor nodes dispersed in the environment, there is not much control over their placements or orientations. Thus, there is a need to develop orientation insensitive antennas that ensure reliable data transmission irrespective of devices’ positions or orientations. As billions of such IoT devices required in the future, a low-cost fabrication process suitable for mass manufacturing must be adapted. Antenna in package (AiP) concept is beneficial that the package is utilized to realize the antennas, not only saving space but also reducing the overall cost. For orientation insensitivity, antennas must be near isotropic and even have to maintain their radiation pattern for multi-bands or wide bandwidths in most applications. However, there is a dearth in the literature about design methodologies for near isotropic antennas, particularly for multi-bands near isotropic AiP designs. In addition, a near isotropic behavior is also important for polarization, particularly for CP antennas. To have simultaneous isotropy in radiation pattern and circular polarization is challenging. In the nut shell, this thesis presents theoretical models and derives conditions for wire AiP design for different specifications, single-band and dual-band near isotropic antennas, null free near isotropic antenna with wide CP coverage, and a full CP antenna with decent near isotropy (with very narrow null beam). The single-band AiP has only 5.05 dB gain variation at WiFi/BLE band and the dual-band AiP has a decent near isotropic radiation property and covers both GSM900 and GSM1800 bands. The theoretical model for null-free near isotropic antenna with wide CP coverage is presented with particle swarm optimization (PSO). The full CP antenna has a measured CP coverage of 70% with a small null in the radiation pattern. The results are promising and indicate that the conditions and methods proposed are useful for the future near isotropic AiP design. Also, this work provides designers flexibility to adjust the AiP design according to their own applications. Advisors/Committee Members: Shamim, Atif (advisor), Shamim, Atif (committee member), Bagci, Hakan (committee member), Wu, Ying (committee member), Wu, Ke (committee member).

Subjects/Keywords: Antenna Theory; Near Isotropic Antenna; Antenna in Package; Antenna Synthesis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Su, Z. (2020). 3D Near Isotropic Antenna in Package for IoT Applications. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/665969

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Su, Zhen. “3D Near Isotropic Antenna in Package for IoT Applications.” 2020. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/665969.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Su, Zhen. “3D Near Isotropic Antenna in Package for IoT Applications.” 2020. Web. 12 Apr 2021.

Vancouver:

Su Z. 3D Near Isotropic Antenna in Package for IoT Applications. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/665969.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Su Z. 3D Near Isotropic Antenna in Package for IoT Applications. [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/665969

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Li, Bodong. Advanced Magnetoimpedance Sensors.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2015, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/344788

► This thesis is concerned with the advanced topics of thin film magnetoimpedance (MI) sensors. The author proposes and develops novel MI sensors that target on… (more)

▼ This thesis is concerned with the advanced topics of thin film magnetoimpedance (MI) sensors. The author proposes and develops novel MI sensors that target on the challenges arising from emerging applications such as flexible electronics, passive wireless sensing, etc. In the study of flexible MI sensor, the investigated sensors of NiFe/Cu/NiFe tri-layersare fabricated on three flexible substrates having different surface roughness: Kapton, standard and premiumphotopaper. Sensitivity versus substrate roughness analysis is carried out for the selection of optimal substrate material. The high magnetic sensing performance is achieved by using Kapton substrate. Stress simulation, incorporated with the theory of magnetostriction effect, reveals the material composition of Ni/Fe being as a key factor of the stress dependent MI effect for the flexible MI sensors. In the development of MI-SAW device for passive wireless magnetic field sensing, NiFe/Cu/NiFe tri-layersand interdigital transducers(IDT) are designed and fabricated on a single piece of LiNbO3substrate, providing a high degree of integration and the advantage of standard microfabrication. The double-electrodeIDT has been utilized and proven to have an optimal sensing performance in comparison to the bi-directional IDT design. The optimized high frequency performance of the thin film MI sensor results in a MI-SAW passive wireless magnetic sensor with high magnetic sensitivity comparing to the MI microwire approach. Benefiting from the high degree of integration of the MI thin film element, in the following study, two additional sensing elements are integrated to the SAW device to have a multifunctional passive wireless sensor with extended temperature and humidity sensing capabilities. Analytical models havebeen developed to eliminate the crossovers of different sensing signals through additional reference IDTs, resulting in a multifunctional passive wireless sensor with the capability of detecting all three measurands individually and simultaneously. Advisors/Committee Members: Kosel, Jürgen (advisor), Bagci, Hakan (committee member), Amassian, Aram (committee member), Vazquez, Manuel (committee member).

Subjects/Keywords: Magnetic sensors; Magnetoimpedance; Passive Wireless; Flexible Sensor

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APA (6^th Edition):

Li, B. (2015). Advanced Magnetoimpedance Sensors. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/344788

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Bodong. “Advanced Magnetoimpedance Sensors.” 2015. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/344788.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Bodong. “Advanced Magnetoimpedance Sensors.” 2015. Web. 12 Apr 2021.

Vancouver:

Li B. Advanced Magnetoimpedance Sensors. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2015. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/344788.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li B. Advanced Magnetoimpedance Sensors. [Thesis]. King Abdullah University of Science and Technology; 2015. Available from: http://hdl.handle.net/10754/344788

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

26. Al-Harthi, Noha A. Performance Benchmarking of Fast Multipole Methods.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2013, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/293890

► The current trends in computer architecture are shifting towards smaller byte/flop ratios, while available parallelism is increasing at all levels of granularity – vector length,… (more)

▼ The current trends in computer architecture are shifting towards smaller byte/flop ratios, while available parallelism is increasing at all levels of granularity – vector length, core count, and MPI process. Intel’s Xeon Phi coprocessor, NVIDIA’s Kepler GPU, and IBM’s BlueGene/Q all have a Byte/flop ratio close to 0.2, which makes it very difficult for most algorithms to extract a high percentage of the theoretical peak flop/s from these architectures. Popular algorithms in scientific computing such as FFT are continuously evolving to keep up with this trend in hardware. In the meantime it is also necessary to invest in novel algorithms that are more suitable for computer architectures of the future. The fast multipole method (FMM) was originally developed as a fast algorithm for ap- proximating the N-body interactions that appear in astrophysics, molecular dynamics, and vortex based fluid dynamics simulations. The FMM possesses have a unique combination of being an efficient O(N) algorithm, while having an operational intensity that is higher than a matrix-matrix multiplication. In fact, the FMM can reduce the requirement of Byte/flop to around 0.01, which means that it will remain compute bound until 2020 even if the cur- rent trend in microprocessors continues. Despite these advantages, there have not been any benchmarks of FMM codes on modern architectures such as Xeon Phi, Kepler, and Blue- Gene/Q. This study aims to provide a comprehensive benchmark of a state of the art FMM code “exaFMM” on the latest architectures, in hopes of providing a useful reference for deciding when the FMM will become useful as the computational engine in a given application code. It may also serve as a warning to certain problem size domains areas where the FMM will exhibit insignificant performance improvements. Such issues depend strongly on the asymptotic constants rather than the asymptotics themselves, and therefore are strongly implementation and hardware dependent. The primary objective of this study is to provide these constants on various computer architectures. Advisors/Committee Members: Keyes, David E. (advisor), Bagci, Hakan (committee member), Ravasi, Timothy (committee member).

Subjects/Keywords: Fast Multiple Method; FMM; Benchmark; Scalability; load balancing; GPU

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APA (6^th Edition):

Al-Harthi, N. A. (2013). Performance Benchmarking of Fast Multipole Methods. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/293890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Al-Harthi, Noha A. “Performance Benchmarking of Fast Multipole Methods.” 2013. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/293890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Al-Harthi, Noha A. “Performance Benchmarking of Fast Multipole Methods.” 2013. Web. 12 Apr 2021.

Vancouver:

Al-Harthi NA. Performance Benchmarking of Fast Multipole Methods. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2013. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/293890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Al-Harthi NA. Performance Benchmarking of Fast Multipole Methods. [Thesis]. King Abdullah University of Science and Technology; 2013. Available from: http://hdl.handle.net/10754/293890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

27. Alfadhel, Ahmed. Magnetic Nanocomposite Cilia Sensors.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2016, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/617228

► Recent progress in the development of artificial skin concepts is a result of the increased demand for providing environment perception such as touch and flow… (more)

▼ Recent progress in the development of artificial skin concepts is a result of the increased demand for providing environment perception such as touch and flow sensing to robots, prosthetics and surgical tools. Tactile sensors are the essential components of artificial skins and attracted considerable attention that led to the development of different technologies for mimicking the complex sense of touch in humans. This dissertation work is devoted to the development of a bioinspired tactile sensing technology that imitates the extremely sensitive hair-like cilia receptors found in nature. The artificial cilia are fabricated from permanent magnetic, biocompatible and highly elastic nanocomposite material, and integrated on a giant magneto-impedance magnetic sensor to measure the stray field. A force that bends the cilia changes the stray field and is therefore detected with the magnetic sensor, providing high performance in terms of sensitivity, power consumption and versatility. The nanocomposite is made of Fe nanowires (NWs) incorporated into polydimethylsiloxane (PDMS). Fe NWs have a high remanent magnetization, due the shape anisotropy; thus, they are acting as permanent nano-magnets. This allows remote device operation and avoids the need for a magnetic field to magnetize the NWs, benefiting miniaturization and the possible range of applications. The magnetic properties of the nanocomposite can be easily tuned by modifying the NWs concentration or by aligning the NWs to define a magnetic anisotropy. Tactile sensors are realized on flexible and rigid substrates that can detect flow, vertical and shear forces statically and dynamically, with a high resolution and wide operating range. The advantage to operate the sensors in liquids and air has been utilized to measure flows in different fluids in a microfluidic channel. Various dynamic studies were conducted with the tactile sensor demonstrating the detection of moving objects or the texture of objects. Overall, the results confirm the possibility to easily control the sensors’ performance with the cilia arrangement and dimensions. The cost effective mold-based microfabrication process and magnetic operation enable a high degree of integration, which together with the extremely low power consumption make the artificial cilia sensor reported in this dissertation an attractive solution for many applications. Advisors/Committee Members: Kosel, Jürgen (advisor), Javey, Ali (committee member), Bagci, Hakan (committee member), Di Fabrizio, Enzo M. (committee member).

Subjects/Keywords: Tactile sensors; Nanowires; magnetic; Nanocomposite; Artificial Skin; Cilia

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APA (6^th Edition):

Alfadhel, A. (2016). Magnetic Nanocomposite Cilia Sensors. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/617228

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alfadhel, Ahmed. “Magnetic Nanocomposite Cilia Sensors.” 2016. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/617228.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alfadhel, Ahmed. “Magnetic Nanocomposite Cilia Sensors.” 2016. Web. 12 Apr 2021.

Vancouver:

Alfadhel A. Magnetic Nanocomposite Cilia Sensors. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2016. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/617228.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alfadhel A. Magnetic Nanocomposite Cilia Sensors. [Thesis]. King Abdullah University of Science and Technology; 2016. Available from: http://hdl.handle.net/10754/617228

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

28. AdbulGhaffar, Farhan. Design of LTCC Based Fractal Antenna.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2010, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/133211

► The thesis presents a Sierpinski Carpet fractal antenna array designed at 24 GHz for automotive radar applications. Miniaturized, high performance and low cost antennas are… (more)

Subjects/Keywords: Low Temparature Co-fired Ceramic; Antenna

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

AdbulGhaffar, F. (2010). Design of LTCC Based Fractal Antenna. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/133211

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

AdbulGhaffar, Farhan. “Design of LTCC Based Fractal Antenna.” 2010. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/133211.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

AdbulGhaffar, Farhan. “Design of LTCC Based Fractal Antenna.” 2010. Web. 12 Apr 2021.

Vancouver:

AdbulGhaffar F. Design of LTCC Based Fractal Antenna. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2010. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/133211.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

AdbulGhaffar F. Design of LTCC Based Fractal Antenna. [Thesis]. King Abdullah University of Science and Technology; 2010. Available from: http://hdl.handle.net/10754/133211

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

29. Martinez, Miguel Angel Galicia. Design and Fabrication of a Reconfigurable MEMS-Based Antenna.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2011, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/136732

► This thesis presents the design and fabrication of a customized in house Micro-Electro-Mechanical-Systems (MEMS) process based on-chip antenna that is both frequency and polarization reconfigurable.… (more)

▼ This thesis presents the design and fabrication of a customized in house Micro-Electro-Mechanical-Systems (MEMS) process based on-chip antenna that is both frequency and polarization reconfigurable. It is designed to work at both 60 GHz and 77 GHz through MEMS switches. This antenna can also work in both horizontal and vertical linear polarizations by utilizing a moveable plate. The design is intended for Wireless Personal Area Networks (WPAN) and automotive radar applications. Typical on-chip antennas are inefficient and difficult to reconfigure. Therefore, the focus of this work is to develop an efficient on-chip antenna solution, which is reconfigurable in frequency and in polarization. A fractal bowtie antenna is employed for this thesis, which achieves frequency reconfigurability through MEMS switches. The design is simulated in industry standard Electromagnetic (EM) simulator Ansoft HFSS. A novel concept for horizontal to vertical linear polarization agility is introduced which incorporates a moveable polymer plate. For this work, a microprobe is used to move the plate from the horizontal to vertical position. For testing purposes, a novel mechanism has been designed in order to feed the antenna with RF-probes in both horizontal and vertical positions. A simulated gain of approximately 0 dB is achieved at both target frequencies (60 and 77 GHz), in both horizontal and vertical positions. In all the cases mentioned above (both frequencies and positions), the antenna is well matched (< -10 dB) to the 50 Ω system impedance. Similarly, the radiation nulls are successfully shifted by changing the position of the antenna from horizontal to vertical. The complete design and fabrication of the reconfigurable MEMS antenna has been done at KAUST facilities. Some challenges have been encountered during its realization due to the immaturity of the customized MEMS fabrication process. Nonetheless, a first fabrication attempt has highlighted such shortcomings. According to the high gain obtained in a lossy silicon substrate and the compatibility of the custom MEMS process with the state of the art standard CMOS process, it is believed that the design of this antenna can lead to efficient and low cost reconfigurable millimeter-wave System-on-Chip (SoC) solution. Advisors/Committee Members: Shamim, Atif (advisor), Bagci, Hakan (committee member), Foulds, Ian G. (committee member).

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APA (6^th Edition):

Martinez, M. A. G. (2011). Design and Fabrication of a Reconfigurable MEMS-Based Antenna. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/136732

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Martinez, Miguel Angel Galicia. “Design and Fabrication of a Reconfigurable MEMS-Based Antenna.” 2011. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/136732.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Martinez, Miguel Angel Galicia. “Design and Fabrication of a Reconfigurable MEMS-Based Antenna.” 2011. Web. 12 Apr 2021.

Vancouver:

Martinez MAG. Design and Fabrication of a Reconfigurable MEMS-Based Antenna. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2011. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/136732.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Martinez MAG. Design and Fabrication of a Reconfigurable MEMS-Based Antenna. [Thesis]. King Abdullah University of Science and Technology; 2011. Available from: http://hdl.handle.net/10754/136732

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

King Abdullah University of Science and Technology

30. Cook, Benjamin. Inkjet Printing of Paper-Based Wideband and High Gain Antennas.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2011, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/205809

► This thesis represents a major contribution to wideband and high gain inkjet-printed antennas on paper. This work includes the complete characterization of the inkjet printing… (more)

Subjects/Keywords: inkjet printer antenna; paper based antenna; inkjet printing nanoparticles; nanoparticle Ink

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APA (6^th Edition):

Cook, B. (2011). Inkjet Printing of Paper-Based Wideband and High Gain Antennas. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/205809

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cook, Benjamin. “Inkjet Printing of Paper-Based Wideband and High Gain Antennas.” 2011. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021. http://hdl.handle.net/10754/205809.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cook, Benjamin. “Inkjet Printing of Paper-Based Wideband and High Gain Antennas.” 2011. Web. 12 Apr 2021.

Vancouver:

Cook B. Inkjet Printing of Paper-Based Wideband and High Gain Antennas. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2011. [cited 2021 Apr 12]. Available from: http://hdl.handle.net/10754/205809.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cook B. Inkjet Printing of Paper-Based Wideband and High Gain Antennas. [Thesis]. King Abdullah University of Science and Technology; 2011. Available from: http://hdl.handle.net/10754/205809

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations