You searched for subject:(Visible light).
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NSYSU
1.
Huang, Yu-Syuan.
Nonlinear Volterra Filter in Visible Light Communication.
Degree: Master, Electro-Optical Engineering, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830114-141053 
► This thesis discusses the channel effects of a visible light communication system on signal performance, when carrier-less amplitude phase (CAP) or orthogonal frequency-division multiplexing (OFDM)…
(more)
▼ This thesis discusses the channel effects of a
visible light communication system on signal performance, when carrier-less amplitude phase (CAP) or orthogonal frequency-division multiplexing (OFDM) modulation scheme is employed. To mitigate the channel effects and interference, which is mainly caused by an LED, this thesis applies linear and Volterra equalizer to equalize the signals, and studies the effects of the filter parameters on the
visible light communication system.
Advisors/Committee Members: Yung-Jr Hung (chair), Chen-Mu Tsai (chair), Chin-Ping Yu (chair), Chia-chien Wei (committee member).
Subjects/Keywords: Visible Light Communication
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APA (6th Edition):
Huang, Y. (2014). Nonlinear Volterra Filter in Visible Light Communication. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830114-141053
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Huang, Yu-Syuan. “Nonlinear Volterra Filter in Visible Light Communication.” 2014. Thesis, NSYSU. Accessed April 18, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830114-141053.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Huang, Yu-Syuan. “Nonlinear Volterra Filter in Visible Light Communication.” 2014. Web. 18 Apr 2021.
Vancouver:
Huang Y. Nonlinear Volterra Filter in Visible Light Communication. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Apr 18].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830114-141053.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Huang Y. Nonlinear Volterra Filter in Visible Light Communication. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830114-141053
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
2.
Mallo, Neil.
Visible light-responsive photoswitches.
Degree: Chemistry, 2019, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/61724
► The structure and properties of photochromic compounds can be altered with light. These photoswitches are ideally addressed with visible light. Various switching motifs are known,…
(more)
▼ The structure and properties of photochromic compounds can be altered with
light. These photoswitches are ideally addressed with
visible light. Various switching motifs are known, each with a different response to
light. Donor-Acceptor Stenhouse Adducts (DASAs) re-emerged as
visible light responsive photoswitches in 2014, and have already found numerous applications. These molecules can be isomerised with green
light between a coloured linear form and a colourless cyclic form.One of the major limitations of these compounds was the range of solvents in which reversible isomerisation is possible. Reversible switching of the initially reported DASAs was only demonstrated in apolar solvents. With the work described in this thesis, isomerisation in a wide range in polar organic solvents is possible. The introduction of aniline-based DASAs, recognised as ‘second generation’ DASAs, led to reversible switching possible in chloroform and acetonitrile. However, the improved photocyclisation comes at the cost of the thermal equilibrium, and large fractions of the cyclic isomer remain present in the dark. Further advances towards switching in water have been made by altering the acceptor group and the first examples of reversible isomerisation in the polar solvents ethanol and DMSO are demonstrated.Establishing a structure-function relationship on ‘first generation’ DASAs has found minor changes in the structure can render these compounds excellent switches in common solvents such as chloroform. This work provides a guideline for the rational design of new compounds. The minor isomers found in solution have been identified and their role towards cyclisation has been studied. Although overlooked in the literature, these minor linear isomers could be part of an alternative path of isomerisation. In solution the cyclic isomer can be present as two tautomeric structures, depending on amine donor, solvent and concentration. For some applications the delicate difference between the two tautomers may have a significant effect on the functionality of the switch, and rational design of the DASA can vastly improve photoinduced changes.
Advisors/Committee Members: Beves, Jonathon, Chemistry, Faculty of Science, UNSW, Thordarson, Pall, Chemistry, Faculty of Science, UNSW.
Subjects/Keywords: Light-responsive; Photoswitch; Visible light
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APA (6th Edition):
Mallo, N. (2019). Visible light-responsive photoswitches. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/61724
Chicago Manual of Style (16th Edition):
Mallo, Neil. “Visible light-responsive photoswitches.” 2019. Doctoral Dissertation, University of New South Wales. Accessed April 18, 2021.
http://handle.unsw.edu.au/1959.4/61724.
MLA Handbook (7th Edition):
Mallo, Neil. “Visible light-responsive photoswitches.” 2019. Web. 18 Apr 2021.
Vancouver:
Mallo N. Visible light-responsive photoswitches. [Internet] [Doctoral dissertation]. University of New South Wales; 2019. [cited 2021 Apr 18].
Available from: http://handle.unsw.edu.au/1959.4/61724.
Council of Science Editors:
Mallo N. Visible light-responsive photoswitches. [Doctoral Dissertation]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/61724
3.
Chen, Cheng.
Downlink system characterisation in LiFi Attocell networks.
Degree: PhD, 2017, University of Edinburgh
URL: http://hdl.handle.net/1842/25420
► There is a trend to move the frequency band for wireless transmission to ever higher frequencies in the radio frequency (RF) spectrum to fulfil the…
(more)
▼ There is a trend to move the frequency band for wireless transmission to ever higher frequencies in the radio frequency (RF) spectrum to fulfil the exponentially increasing demand in wireless communication capacity. Research work has gone into improving the spectral efficiency of wireless communication system to use the scarce and expensive resources in the most efficient way. However, to make wireless communication future-proof, it is essential to explore ways to transmit wirelessly outside the traditional RF spectrum. The visible light (VL) spectrum bandwidth is 1000 times wider than the entire 300 GHz RF spectrum and is, therefore, a viable alternative. Visible light communication (VLC) enables existing lighting infrastructures to provide not only illumination but also wireless communication. In conjunction with the concept of cell densification, a networked VLC system, light fidelity attocell (LAC) network, has been proposed to offer wide coverage and high speed wireless data transmission. In this study, many issues related to the downlink system in LAC networks have been investigated. When analysing the downlink performance of LAC networks, a large number of random channel samples are required for the empirical calculation of some system metrics, such as the signal-to-interference-plus-noise ratio (SINR). However, using state-of-the-art approaches to calculate the non-line-of-sight (NLoS) channel component leads to significant computational complexity and prolonged computation time. An analytical method has been presented in this thesis to efficiently calculate the NLoS channel impulse response (CIR) in VLC systems. The results show that the proposed method offers significant reduction in computation time compared to the state-of-the-art approaches. A comprehensive performance evaluation of the downlink system of LAC networks is carried out in this thesis. Based on the research results in the literature in the field of optical wireless communication (OWC), a system level framework for the downlink system in LAC networks is developed. By using this framework, the downlink performance subject to a large number of parameters is evaluated. Additionally, the effect of varying network size, cell deployment and key system parameters are investigated. The calculation of downlink SINR statistics, cell data rate and outage probability are considered and analysed. The results show that the downlink performance of LAC networks is promising in terms of achievable data rate per unit area compared to other state-of-the-art RF small-cell networks. It is found that co-channel interference (CCI) is a major source of signal impairment in the downlink of LAC network. In order to mitigate the influence of CCI on signal distortion in LAC networks, widely used interference mitigation techniques for RF cellular systems are borrowed and extensively investigated. In this study, fractional frequency reuse (FFR) is adapted to the downlink of LAC networks. The SINR statistics and the spectral efficiency in LAC downlink system with FFR…
Subjects/Keywords: 621.382; light fidelity; visible light; visible light communication; cellular network
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APA (6th Edition):
Chen, C. (2017). Downlink system characterisation in LiFi Attocell networks. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/25420
Chicago Manual of Style (16th Edition):
Chen, Cheng. “Downlink system characterisation in LiFi Attocell networks.” 2017. Doctoral Dissertation, University of Edinburgh. Accessed April 18, 2021.
http://hdl.handle.net/1842/25420.
MLA Handbook (7th Edition):
Chen, Cheng. “Downlink system characterisation in LiFi Attocell networks.” 2017. Web. 18 Apr 2021.
Vancouver:
Chen C. Downlink system characterisation in LiFi Attocell networks. [Internet] [Doctoral dissertation]. University of Edinburgh; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1842/25420.
Council of Science Editors:
Chen C. Downlink system characterisation in LiFi Attocell networks. [Doctoral Dissertation]. University of Edinburgh; 2017. Available from: http://hdl.handle.net/1842/25420
IUPUI
4.
Jiang, Ruizhe.
A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel.
Degree: 2020, IUPUI
URL: http://hdl.handle.net/1805/23390
► Indiana University-Purdue University Indianapolis (IUPUI)
Recently witnessed a great popularity of unobtrusive Visible Light Communication (VLC) using screen-camera channels. They overcomes the inherent drawbacks of…
(more)
▼ Indiana University-Purdue University Indianapolis (IUPUI)
Recently witnessed a great popularity of unobtrusive Visible Light Communication (VLC) using screen-camera channels. They overcomes the inherent drawbacks of traditional approaches based on coded images like bar codes. One popular unobtrusive method is the utilizing of alpha channel or color channels to encode bits into the pixel translucency or color intensity changes with over-the-shelf smart devices. Specifically, Uber-in-light proves to be an successful model encoding data into the color intensity changes that only requires over-the-shelf devices. However, Uber-in-light only exploit Multi Frequency Shift Keying (MFSK), which limits the overall throughput of the system since each data segment is only 3-digit long. Motivated by some previous works like Inframe++ or Uber-in-light, in this thesis, we proposes a new VLC model encoding data into color intensity changes on red and blue channels of video frames. Multi-Phase-Shift-Keying (MPSK) along with MFSK are used to match 4-digit and 5-digit long data segments to specific transmission frequencies and phases. To ensure the transmission accuracy, a modified correlation-based demodulation method and two learning-based methods using SVM and Random Forest are also developed.
Advisors/Committee Members: King, Brian, Guo, Xiaonan, Xiao, Luo.
Subjects/Keywords: Visible Light Communication; Machine Learning
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APA (6th Edition):
Jiang, R. (2020). A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel. (Thesis). IUPUI. Retrieved from http://hdl.handle.net/1805/23390
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jiang, Ruizhe. “A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel.” 2020. Thesis, IUPUI. Accessed April 18, 2021.
http://hdl.handle.net/1805/23390.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jiang, Ruizhe. “A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel.” 2020. Web. 18 Apr 2021.
Vancouver:
Jiang R. A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel. [Internet] [Thesis]. IUPUI; 2020. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1805/23390.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jiang R. A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel. [Thesis]. IUPUI; 2020. Available from: http://hdl.handle.net/1805/23390
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
5.
Deshpande, A. (author).
Relative localization for Mobile Nodes using Visible Light.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d4fac3ee-7e83-4c1e-93da-2875b2c20121
► A growing number of wireless devices and increasing traffic in the radio spectrum has pushed for alternatives to radio based communication. Among these, communication using…
(more)
▼ A growing number of wireless devices and increasing traffic in the radio spectrum has pushed for alternatives to radio based communication. Among these, communication using visible light (VLC) has gained considerable momentum. The imminent adoption of energy efficient Light Emitting Diodes (LEDs) and the high data transmission rates offered by VLC has greatly contributed to the spread of visible light as a competitive communication medium. Apart from communication, another area greatly benefiting from visible light is localization. A significant amount of work has been done in localization for VLC based networks, however most of the methods proposed are dependent on either surrounding environments or require multiple reference points at fixed positions for localization. These dependencies greatly restrict localization for scenarios where a lot of mobility is involved, such as vehicles on a road, or robots in an industrial environment. This master thesis presents a localization model which can be used to find the relative position of devices or nodes without such dependencies. Compared to the existing work in this field, in our proposed model, nodes are free to move and rotate in any direction, and only require a single light source for position estimation. We present a mathematical model for relative localization and a software implementation to visualize the location of nodes in real-time. Results from experiments conducted in both static and mobile settings under different illumination levels validate our proposed model. These results also highlight the effect of errors in received power and orientation of nodes on localization accuracy. Our work indicates that this proposed model can be further extended and implemented in a real world scenario.
Electrical Engineering, Mathematics and Computer Science
Software Technology
Embedded Software
Advisors/Committee Members: Zuñiga Zamalloa, M.A. (mentor).
Subjects/Keywords: visible light; communication; localization; mobile
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APA (6th Edition):
Deshpande, A. (. (2016). Relative localization for Mobile Nodes using Visible Light. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d4fac3ee-7e83-4c1e-93da-2875b2c20121
Chicago Manual of Style (16th Edition):
Deshpande, A (author). “Relative localization for Mobile Nodes using Visible Light.” 2016. Masters Thesis, Delft University of Technology. Accessed April 18, 2021.
http://resolver.tudelft.nl/uuid:d4fac3ee-7e83-4c1e-93da-2875b2c20121.
MLA Handbook (7th Edition):
Deshpande, A (author). “Relative localization for Mobile Nodes using Visible Light.” 2016. Web. 18 Apr 2021.
Vancouver:
Deshpande A(. Relative localization for Mobile Nodes using Visible Light. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Apr 18].
Available from: http://resolver.tudelft.nl/uuid:d4fac3ee-7e83-4c1e-93da-2875b2c20121.
Council of Science Editors:
Deshpande A(. Relative localization for Mobile Nodes using Visible Light. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:d4fac3ee-7e83-4c1e-93da-2875b2c20121
McMaster University
6.
Sepehrvand, Sahand.
Rate-Power Trade-Off in Solar Cell-based Simultaneous Lightwave Information and Power Transfer Systems.
Degree: MASc, 2020, McMaster University
URL: http://hdl.handle.net/11375/25782
► The Internet-of-Things (IoT) infrastructure is made of uniquely identifiable wireless-enabled smart devices that use the Internet to communicate with each other as well as people,…
(more)
▼ The Internet-of-Things (IoT) infrastructure is made of uniquely identifiable wireless-enabled smart devices that use the Internet to communicate with each other as well as people, on a large scale. These IoT devices require power to operate, and to communicate with other smart devices. The optical bands have the capacity to provide power and wireless communication to the IoT devices.
Simultaneous lightwave information and power transmission (SLIPT) is a technology through which information and optical power are received simultaneously by the receiver. SLIPT is made possible by solar cell-based SLIPT receivers. In this thesis, for the first time, the trade-off between the achievable data rate and the harvested power in solar cell-based SLIPT systems is quantified and analysed.
It is known that the amount of power harvested using a solar cell is dependent on its operating voltage.
By utilizing a realistic electrical model of the solar cells, an expression for the bandwidth and a lower bound on the data rate of a solar cell receiver as function of the operating voltage is derived. Using the dependency of rate and power on the operating voltage, the rate-power trade-off in solar cell based SLIPT receivers are studied in this thesis.
This work proposes a novel solar cell based SLIPT receiver that includes a DC-DC boost converter, which allows control over the operating voltage of the solar cell.
Finally, this thesis proposes an optimization problem to compute the optimum operating voltage for a SLIPT system located indoor where a desired trade-off between the data rate and harvested power can be attained based on the battery state of charge.
Thesis
Master of Applied Science (MASc)
Advisors/Committee Members: Hranilovic, Steve, Electrical and Computer Engineering.
Subjects/Keywords: Visible Light Communication; Power Harvesting
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APA (6th Edition):
Sepehrvand, S. (2020). Rate-Power Trade-Off in Solar Cell-based Simultaneous Lightwave Information and Power Transfer Systems. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/25782
Chicago Manual of Style (16th Edition):
Sepehrvand, Sahand. “Rate-Power Trade-Off in Solar Cell-based Simultaneous Lightwave Information and Power Transfer Systems.” 2020. Masters Thesis, McMaster University. Accessed April 18, 2021.
http://hdl.handle.net/11375/25782.
MLA Handbook (7th Edition):
Sepehrvand, Sahand. “Rate-Power Trade-Off in Solar Cell-based Simultaneous Lightwave Information and Power Transfer Systems.” 2020. Web. 18 Apr 2021.
Vancouver:
Sepehrvand S. Rate-Power Trade-Off in Solar Cell-based Simultaneous Lightwave Information and Power Transfer Systems. [Internet] [Masters thesis]. McMaster University; 2020. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/11375/25782.
Council of Science Editors:
Sepehrvand S. Rate-Power Trade-Off in Solar Cell-based Simultaneous Lightwave Information and Power Transfer Systems. [Masters Thesis]. McMaster University; 2020. Available from: http://hdl.handle.net/11375/25782
University of New South Wales
7.
Jung, Kenward.
Green Synthesis of Polymers in an Aqueous Dispersed System - A Visible Light Mediated Miniemulsion Approach.
Degree: Chemical Engineering, 2018, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/60906
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:54236/SOURCE02?view=true
► An exploratory investigation into the implementation of visible light mediated reversible deactivation radical polymerization (RDRP) in an aqueous dispersed system is conducted. Visible light mediated…
(more)
▼ An exploratory investigation into the implementation of
visible light mediated reversible deactivation radical polymerization (RDRP) in an aqueous dispersed system is conducted.
Visible light mediated Radical Addition-Fragmentation chain Transfer (RAFT) polymerizations provide an energy efficient route to the controlled synthesis of polymers. In contrast to conventional approaches, reactions proceed at room temperature, requiring only exposure to low energy
visible wavelengths. Free of harmful radical initiators, this energy efficient synthetic approach can further be enhanced by implementation in an aqueous dispersed system. Doing so affords environmentally-friendly solvent-free conditions that exemplify the green credentials of this technology. However, the turbidity of dispersed polymerization systems is a potential impediment to the successful application of this technology. The use of miniemulsions as a model dispersed system would be a true test to the capabilities of
visible light mediated RAFT processes.Utilizing the Photoinduced Electron/Energy Transfer – Reversible Addition-Fragmentation chain Transfer (PET-RAFT) process, the initial study demonstrated that the implementation of
visible light mediated polymerizations in an aqueous dispersed system is indeed feasible and warranted further investigation. Due to the poor solubility of available photocatalysts, the
visible light mediated RAFT iniferter process was investigated as an alternative. Operating without the aid of a catalyst, the RAFT iniferter process surprisingly provided faster rates of polymerization. A crucial discovery was made during this work; surface-activity of the RAFT agent induces an exit and ‘frustrated’ re-entry phenomenon that delays nucleation and causes inhibition of the polymerization process. A simple modification afforded suppression of surface-activity and a corresponding improvement was observed in the polymerization kinetics. The value of this approach was further verified by the superior livingness that was demonstrated in comparison to the surface-active iniferter. These promising results confirm the capability of
visible light to mediate polymerization processes despite the turbidity and mark the first steps towards the development of greener polymerization technologies.
Advisors/Committee Members: Boyer, Cyrille, Centre for Advanced Macromolecular Design, Faculty of Engineering, UNSW, Zetterlund, Per, Centre for Advanced Macromolecular Design, Faculty of Engineering, UNSW.
Subjects/Keywords: Heterogeneous Polymerization; Visible light; Photopolymerization
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APA (6th Edition):
Jung, K. (2018). Green Synthesis of Polymers in an Aqueous Dispersed System - A Visible Light Mediated Miniemulsion Approach. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60906 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:54236/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Jung, Kenward. “Green Synthesis of Polymers in an Aqueous Dispersed System - A Visible Light Mediated Miniemulsion Approach.” 2018. Doctoral Dissertation, University of New South Wales. Accessed April 18, 2021.
http://handle.unsw.edu.au/1959.4/60906 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:54236/SOURCE02?view=true.
MLA Handbook (7th Edition):
Jung, Kenward. “Green Synthesis of Polymers in an Aqueous Dispersed System - A Visible Light Mediated Miniemulsion Approach.” 2018. Web. 18 Apr 2021.
Vancouver:
Jung K. Green Synthesis of Polymers in an Aqueous Dispersed System - A Visible Light Mediated Miniemulsion Approach. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Apr 18].
Available from: http://handle.unsw.edu.au/1959.4/60906 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:54236/SOURCE02?view=true.
Council of Science Editors:
Jung K. Green Synthesis of Polymers in an Aqueous Dispersed System - A Visible Light Mediated Miniemulsion Approach. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60906 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:54236/SOURCE02?view=true
Rutgers University
8.
Nguyen, Viet H.
Communication and sensing techniques for smart, seamless human-environment interactions.
Degree: PhD, Electrical and Computer Engineering, 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61829/
► Since its birth over 70 years ago, the computing area has gone over several generations, with significant reduction in size and cost. We are now…
(more)
▼ Since its birth over 70 years ago, the computing area has gone over several generations, with significant reduction in size and cost. We are now entering a new generation of computing, called ubiquitous computing, where many small computers (smartphones, tablets, sensors, actuators, etc.) are placed on user's body or in the environments and provide many useful services to users. However, current devices and communication methods have not been able to provide fully smart and seamless interaction between users and the environments yet: either users are required to explicitly give attentions to devices and give them instructions to run, or environments need to be equipped with additional infrastructure, often expensive or inconvenient, to monitor user's presence and activities. Therefore, the next generation of computing requires devices that implicitly align with user's intention, obtain necessary information from environments as well as implicitly control them, and smart environments with minimal infrastructure setup to monitor user presence and behaviors.
The goal of this research is to propose novel communication and sensing methods to enable such requirements. In particular, the proposed solutions include: (i) TextureCode, a flicker-free high-speed screen-camera communication technique to help smart glasses equipped with cameras obtain useful information from video stream on electronics displays, (ii) a body-guided communication technique that are used for authenticating users with devices and objects on every single touch interaction, (iii) EyeLight, a sensing system based on visible light to provide indoor occupancy estimation and room activity recognition services, and (iv) HandSense, an on-hand capacitive coupling-based sensing system for recognizing micro, dynamic finger gestures suitable for controlling head-mounted devices. We believe these systems provide users with more seamless interaction with surrounding environments: as the environment-user interactions implicitly align well with user's intention, data exchange, sensing, or authentication happens in the background without interruption to user's workflow.
Advisors/Committee Members: Gruteser, Marco (chair), Chen, Yingying (internal member), Trappe, Wade (internal member), Howard, Richard (internal member), Vu, Tam (outside member), School of Graduate Studies.
Subjects/Keywords: Visible light communication; Ambient intelligence
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APA (6th Edition):
Nguyen, V. H. (2019). Communication and sensing techniques for smart, seamless human-environment interactions. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61829/
Chicago Manual of Style (16th Edition):
Nguyen, Viet H. “Communication and sensing techniques for smart, seamless human-environment interactions.” 2019. Doctoral Dissertation, Rutgers University. Accessed April 18, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/61829/.
MLA Handbook (7th Edition):
Nguyen, Viet H. “Communication and sensing techniques for smart, seamless human-environment interactions.” 2019. Web. 18 Apr 2021.
Vancouver:
Nguyen VH. Communication and sensing techniques for smart, seamless human-environment interactions. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Apr 18].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61829/.
Council of Science Editors:
Nguyen VH. Communication and sensing techniques for smart, seamless human-environment interactions. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61829/
University of Cambridge
9.
Flodén, Nils.
Radical methods for the synthesis of aliphatic amines.
Degree: PhD, 2020, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/317125
► The aliphatic amine motif is a ubiquitous and uniquely important functional group in pharmaceutical agents and the development of ever more efficient synthetic methods for…
(more)
▼ The aliphatic amine motif is a ubiquitous and uniquely important functional group in pharmaceutical agents and the development of ever more efficient synthetic methods for their synthesis is a continuous challenge. This thesis details the development of three new radical reactions for the synthesis of aliphatic amines. Following an introduction to radical chemistry and a summary of previous advances in amine synthesis, chapter 2 will describe a general carbonyl alkylative amination reaction, a successful version of which has been sought for over 70 years. Facilitated by visible light and a silane reducing agent, the operationally straightforward reaction forms tertiary amines via the coupling of aldehydes and secondary amines with alkyl halides. Combining an efficient radical-chain mechanism with the structural and functional diversity of readily available starting materials, the carbonyl alkylative amination provides a flexible strategy for the streamlined synthesis of complex tertiary amines. In chapter 3, an improved carbonyl alkylative amination was sought by replacing the alkyl halide with a more abundant radical precursor. This led to the development of a new carbonyl alkylative amination reaction using tetrachloro N-hydroxyphthalimide esters, prepared from carboxylic acids, in conjunction with inexpensive and environmentally friendly zinc dust instead of the costly silane reducing agent. The use of a carboxylic acid derived nucleophile enabled a broader scope in both amine and nucleophile components and the full potential of this reaction is currently being developed. In chapter 4, a visible light-mediated direct synthesis of N-heterospirocycles is reported. A photocatalyst was employed to reduce an aliphatic iminium ion to the corresponding -amino radical, which was cyclized to afford polar, heteroatom-rich spirocycles. The reaction tolerated a range of polar functional groups and the resulting scaffolds were shown to occupy a promising yet less exploited area of chemical space, making the reaction relevant for fragment-based drug discovery.
Subjects/Keywords: Radicals; Amines; Photoredox; Visible light
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APA (6th Edition):
Flodén, N. (2020). Radical methods for the synthesis of aliphatic amines. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/317125
Chicago Manual of Style (16th Edition):
Flodén, Nils. “Radical methods for the synthesis of aliphatic amines.” 2020. Doctoral Dissertation, University of Cambridge. Accessed April 18, 2021.
https://www.repository.cam.ac.uk/handle/1810/317125.
MLA Handbook (7th Edition):
Flodén, Nils. “Radical methods for the synthesis of aliphatic amines.” 2020. Web. 18 Apr 2021.
Vancouver:
Flodén N. Radical methods for the synthesis of aliphatic amines. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Apr 18].
Available from: https://www.repository.cam.ac.uk/handle/1810/317125.
Council of Science Editors:
Flodén N. Radical methods for the synthesis of aliphatic amines. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://www.repository.cam.ac.uk/handle/1810/317125
Delft University of Technology
10.
Suwignyo, Haris (author).
Increasing the Performance of Passive Communication with Ambient Light.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b6637f53-4d37-4e79-a184-240bc2c4f32d
► Most wireless communication technologies have been using the Radio Frequency (RF) spectrum for decades. Due to the popularity of the Internet of Things (IoT), the…
(more)
▼ Most wireless communication technologies have been using the Radio Frequency (RF) spectrum for decades. Due to the popularity of the Internet of Things (IoT), the RF spectrum has started to become densely populated. Researchers have begun to explore other bands of the electromagnetic spectrum that can be utilized as a communication media. One of the promising choices is the visible light spectrum. Visible Light Communication (VLC) refers to the wireless communication technology that utilizes the visible light spectrum. This spectrum is thousands of times wider than the Radio Frequency (RF) spectrum and is license-free. In VLC, data is transmitted by turning a light source on and off. However, not every light source can be controlled. Passive light sources such as the sun provide an immense amount of light that can be used for wireless communication if we can develop ways to modulate them. One of the researches that use ambient light to create a wireless link is LuxLink. LuxLink uses liquid crystal shutters to control passive light sources and provides low energy, reliable, and flicker-free (safe) communication. This thesis addresses several problems that the current LuxLink system has. We present LuxLink+, an extension of LuxLink that provides two main improvements. Firstly, the data rate of the system is relatively low (80~bps). To increase the data rate, we provide a thorough analysis of the system’s bandwidth. Afterward, we modify the modulation technique, which increases the data rate to 1000~bps at a range of 1.5~m. Secondly, the system has a static data rate, which means that the system cannot adapt its data rate to changes in the environment. We implement a rate adaptation algorithm that can change its data rate accordingly. LuxLink+ improves the average throughput of the system by up to 85 percent compared to LuxLink.
Electrical Engineer | Embedded Systems
Advisors/Committee Members: Zuñiga Zamalloa, Marco (mentor), Langendoen, Koen (graduation committee), Al-Ars, Zaid (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: visible light communication; passive communication; ambient light
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APA (6th Edition):
Suwignyo, H. (. (2019). Increasing the Performance of Passive Communication with Ambient Light. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b6637f53-4d37-4e79-a184-240bc2c4f32d
Chicago Manual of Style (16th Edition):
Suwignyo, Haris (author). “Increasing the Performance of Passive Communication with Ambient Light.” 2019. Masters Thesis, Delft University of Technology. Accessed April 18, 2021.
http://resolver.tudelft.nl/uuid:b6637f53-4d37-4e79-a184-240bc2c4f32d.
MLA Handbook (7th Edition):
Suwignyo, Haris (author). “Increasing the Performance of Passive Communication with Ambient Light.” 2019. Web. 18 Apr 2021.
Vancouver:
Suwignyo H(. Increasing the Performance of Passive Communication with Ambient Light. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Apr 18].
Available from: http://resolver.tudelft.nl/uuid:b6637f53-4d37-4e79-a184-240bc2c4f32d.
Council of Science Editors:
Suwignyo H(. Increasing the Performance of Passive Communication with Ambient Light. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:b6637f53-4d37-4e79-a184-240bc2c4f32d
McMaster University
11.
Taylor, Michael Thomas.
Angular Diversity Based Visible Light Positioning.
Degree: MASc, 2014, McMaster University
URL: http://hdl.handle.net/11375/16362
► Visible Light Positioning (VLP) uses modulated LED luminaries to help locate a receiver inside a building. Indoor positioning is becoming an increasingly important service, and…
(more)
▼ Visible Light Positioning (VLP) uses modulated LED luminaries to help locate a
receiver inside a building. Indoor positioning is becoming an increasingly important
service, and visible light has many advantages over other technologies used in indoor
positioning systems (IPS). However existing VLP approaches have major drawbacks
in robustness that have hindered their ability to be commercially deployed.
This work proposes and demonstrates a new way of using light signals in an indoor
localization system, titled Angular Diversity Visible Light Positioning (AD-VLP).
AD-VLP uses optics at the transmitter to create a structured overlapping light pattern
that can be used for positioning. This method is shown to have several advantages
over existing VLP approaches, including increased robustness over intensity based
techniques while still using a single element receiver.
This work also includes an experimental implementation of the proposed AD-VLP
system using existing mobile device technology. The experiments prove that
sub-meter accuracy is obtainable, even when the receiver is oriented away from the
transmitter.
Thesis
Master of Applied Science (MASc)
Advisors/Committee Members: Hranilovic, Steve, Electrical and Computer Engineering.
Subjects/Keywords: visible light positioning; visible light communications; indoor positioning
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APA (6th Edition):
Taylor, M. T. (2014). Angular Diversity Based Visible Light Positioning. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/16362
Chicago Manual of Style (16th Edition):
Taylor, Michael Thomas. “Angular Diversity Based Visible Light Positioning.” 2014. Masters Thesis, McMaster University. Accessed April 18, 2021.
http://hdl.handle.net/11375/16362.
MLA Handbook (7th Edition):
Taylor, Michael Thomas. “Angular Diversity Based Visible Light Positioning.” 2014. Web. 18 Apr 2021.
Vancouver:
Taylor MT. Angular Diversity Based Visible Light Positioning. [Internet] [Masters thesis]. McMaster University; 2014. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/11375/16362.
Council of Science Editors:
Taylor MT. Angular Diversity Based Visible Light Positioning. [Masters Thesis]. McMaster University; 2014. Available from: http://hdl.handle.net/11375/16362
University of Michigan
12.
McAtee, Rory.
Innovations in Photochemical C-C and C-N Bond Forming Reactions.
Degree: PhD, Chemistry, 2019, University of Michigan
URL: http://hdl.handle.net/2027.42/153425
► Over the past decade, photoredox catalysis has risen to the forefront of synthetic organic chemistry as an indispensable tool for selective small-molecule activation and chemical-bond…
(more)
▼ Over the past decade, photoredox catalysis has risen to the forefront of synthetic organic chemistry as an indispensable tool for selective small-molecule activation and chemical-bond formation. New bond forming strategies have the potential to impact a variety of synthetic endeavors including, pharmaceuticals, natural product synthesis, and material sciences. This cutting-edge platform allows photosensitizers to convert
visible light into chemical energy, prompting generation of reactive radical intermediates. In particular, the formation of new C−C and C−N bonds is fundamental to organic synthesis. This thesis describes some of our contributions to the design, optimization, implementation, and mechanistic underpinnings of novel C−C and C−N bond forming reactions mediated by photoredox catalysis.
Chapter 1 provides a detailed summary of the importance of photoredox catalysis in organic synthesis and its appeal as an enabling technology for free radical generation. The history. key contributions in the field, the impact of
light arrays on reactivity, aliphatic amine functionalization, designing complementary mechanistic paradigms, and applications of photoredox catalysis in industry is reviewed.
Chapter 2 focuses on a method for the radical chlorodifluoromethylation of (hetero)arenes using chlorodifluoroacetic anhydride. A historical perspective on (hetero)arene functionalization via the classic Minisci reaction, along with strategies for radical (perfluoro)alkylation, are presented. Optimization studies, elucidation of scope, and product diversification of chlorodifluoromethylated (hetero)arenes is described.
Chapter 3 describes our efforts in the area of alkene aminoarylation using simple bifunctional arylsulfonylacetamide reagents to synthesize 2,2-diarylethylamines. In this process, single-electron alkene oxidation enables C−N bond formation to provide a key benzylic radical poised for a Smiles-Truce 1,5-aryl shift. This reaction is redox-neutral, exhibits broad functional group compatibility, and occurs at room temperature with loss of sulfur dioxide. The ability of photoredox catalysis to mediate the formation C−C and C−N bonds in a single operation is established in this Chapter.
Chapter 4 continues to explore the utility of bifunctional arylsulfonylacetamide reagents; now in the context of arene dearomatization. Arene dearomatization reactions are an important class of synthetic technologies for the rapid assembly of unique chemical architectures. Here, we describe a catalytic protocol to initiate a carboamination/dearomatization cascade that proceeds through transient sulfonamidyl radical intermediates formed from strong N−H bonds leading to 1,4-cyclohexadiene-fused sultams. Reaction optimization, substrate scope, and mechanistic features of this transformation are presented. Additionally, several new substrate classes are identified which undergo N-radical aryl transfer reactivity with electron-neutral olefins leading to functionalized arylethylamine products in good yields.
Advisors/Committee Members: Stephenson, Corey (committee member), Ault, Andrew P (committee member), Schindler, Corinna (committee member), Wolfe, John P (committee member).
Subjects/Keywords: photoredox catalysis, visible light, radicals; Chemistry; Science
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Manager
APA (6th Edition):
McAtee, R. (2019). Innovations in Photochemical C-C and C-N Bond Forming Reactions. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/153425
Chicago Manual of Style (16th Edition):
McAtee, Rory. “Innovations in Photochemical C-C and C-N Bond Forming Reactions.” 2019. Doctoral Dissertation, University of Michigan. Accessed April 18, 2021.
http://hdl.handle.net/2027.42/153425.
MLA Handbook (7th Edition):
McAtee, Rory. “Innovations in Photochemical C-C and C-N Bond Forming Reactions.” 2019. Web. 18 Apr 2021.
Vancouver:
McAtee R. Innovations in Photochemical C-C and C-N Bond Forming Reactions. [Internet] [Doctoral dissertation]. University of Michigan; 2019. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/2027.42/153425.
Council of Science Editors:
McAtee R. Innovations in Photochemical C-C and C-N Bond Forming Reactions. [Doctoral Dissertation]. University of Michigan; 2019. Available from: http://hdl.handle.net/2027.42/153425
Boston College
13.
Yang, Jingchen.
Using the Transient IR Spectroscopy to Elucidate Reaction
Mechanisms in Visible Light Photoredox Catalysis.
Degree: MS, Chemistry, 2020, Boston College
URL: http://dlib.bc.edu/islandora/object/bc-ir:108934
► Studying the visible light-driven photoredox catalysis coupled with transition-metal complexes is of overriding importance in the development of synthetic strategy. Comparing to conventional thermal catalysis,…
(more)
▼ Studying the
visible light-driven photoredox catalysis
coupled with transition-metal complexes is of overriding importance
in the development of synthetic strategy. Comparing to conventional
thermal catalysis, reactions catalyzed and/ or initiated by photon
energy are not only attractive for establishing a more sustainable
system, but also for their unique reactivity that has previously
been inaccessible. However, one issue draws our attention is that
such photoredox catalytic schemes often suffer from a limited
substrate scope. To develop more efficient and effective synthetic
strategies applicable to broader range of substrates, it is of our
interest to construct an functional and reliable instrument to
identify the critical mechanistic steps that lead to low product
yield. To this end, we designed a time-resolved
visible-pump/
infrared-probe spectroscopic measurement technique to monitor
reaction dynamics in-situ. Using our transmission infrared setup,
we effectively demonstrated in-situ photoexcitation and decay
process of Tris(2,2′-bipyridyl)dichlororuthenium(II) hexahydrate in
deuterated acetonitrile. In addition, to optimize signal
resolution, an electronic filter was installed in one of the
data-collecting channels to allow for concurrent AC-coupled and
DC-coupled signal recording. A series of chopper wheel experiments
was conducted to assure the functionality of the system and
reliability of obtained data.
Advisors/Committee Members: Matthias M. Waegele (Thesis advisor).
Subjects/Keywords: Visible Light Photoredox Catalysis; Transient IR Spectroscopy
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APA (6th Edition):
Yang, J. (2020). Using the Transient IR Spectroscopy to Elucidate Reaction
Mechanisms in Visible Light Photoredox Catalysis. (Masters Thesis). Boston College. Retrieved from http://dlib.bc.edu/islandora/object/bc-ir:108934
Chicago Manual of Style (16th Edition):
Yang, Jingchen. “Using the Transient IR Spectroscopy to Elucidate Reaction
Mechanisms in Visible Light Photoredox Catalysis.” 2020. Masters Thesis, Boston College. Accessed April 18, 2021.
http://dlib.bc.edu/islandora/object/bc-ir:108934.
MLA Handbook (7th Edition):
Yang, Jingchen. “Using the Transient IR Spectroscopy to Elucidate Reaction
Mechanisms in Visible Light Photoredox Catalysis.” 2020. Web. 18 Apr 2021.
Vancouver:
Yang J. Using the Transient IR Spectroscopy to Elucidate Reaction
Mechanisms in Visible Light Photoredox Catalysis. [Internet] [Masters thesis]. Boston College; 2020. [cited 2021 Apr 18].
Available from: http://dlib.bc.edu/islandora/object/bc-ir:108934.
Council of Science Editors:
Yang J. Using the Transient IR Spectroscopy to Elucidate Reaction
Mechanisms in Visible Light Photoredox Catalysis. [Masters Thesis]. Boston College; 2020. Available from: http://dlib.bc.edu/islandora/object/bc-ir:108934
University of Edinburgh
14.
Chen, Zhe.
Interference mitigation techniques for optical attocell networks.
Degree: PhD, 2017, University of Edinburgh
URL: http://hdl.handle.net/1842/22868
► The amount of wireless data traffic has been increasing exponentially. This results in the shortage of radio frequency (RF) spectrum. In order to alleviate the…
(more)
▼ The amount of wireless data traffic has been increasing exponentially. This results in the shortage of radio frequency (RF) spectrum. In order to alleviate the looming spectrum crisis, visible light communication (VLC) has emerged as a supplement to RF techniques. VLC uses light emitting diodes (LEDs) for transmission and employs photodiodes (PDs) for detection. With the advancement of the LED technology, LEDs can now fulfil two functions at the same time: illumination and high-speed wireless communication. In a typical indoor scenario, each single light fixture can act as an access point (AP), and multiple light fixtures in a room can form a cellular wireless network. We refer to this type of networks as ‘optical attocell network’. This thesis focuses on interference mitigation in optical attocell networks. Firstly, the downlink inter-cell interference (ICI) model in optical attocell networks is investigated. The conventional ray-tracing channel model for non-line-of-sight (NLOS) path is studied. Although this model is accurate, it leads to time-consuming computer simulations. In order to reduce the computational complexity, a simplified channel model is proposed to accurately characterise NLOS ICI in optical attocell networks. Using the simplified model, the received signal-to-interference-plus-noise ratio (SINR) distribution in optical attocell networks can be derived in closed-form. This signifies that no Monte Carlo simulation is required to evaluate the user performance in optical attocell networks. Then, with the knowledge of simplified channel model, interference mitigation techniques using angle diversity receivers (ADRs) are investigated in optical attocell networks. An ADR typically consists of multiple PDs with different orientations. By using proper signal combining schemes, ICI in optical attocell networks can be significantly mitigated. Also, a novel double-source cell configuration is proposed. This configuration can further mitigate ICI in optical attocell networks in conjunction with ADRs. Moreover, an analytical framework is proposed to evaluate the user performance in optical attocell networks with ADRs. Finally, optical space division multiple access (SDMA) using angle diversity transmitters is proposed and investigated in optical attocell networks. Optical SDMA can exploit the available bandwidth resource in spatial dimension and mitigate ICI in optical attocell networks. Compared with optical time division multiple access (TDMA), optical SDMA can significantly improve the throughput of optical attocell networks. This improvement scales with the number of LED elements on each angle diversity transmitter. In addition, the upper bound and the lower bound of optical SDMA performance are derived analytically. These bounds can precisely evaluate the performance of optical SDMA systems. Furthermore, optical SDMA is shown to be robust against user position errors, and this makes optical SDMA suitable for practical implementations.
Subjects/Keywords: 621.36; visible light communication; optical attocell network
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APA (6th Edition):
Chen, Z. (2017). Interference mitigation techniques for optical attocell networks. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/22868
Chicago Manual of Style (16th Edition):
Chen, Zhe. “Interference mitigation techniques for optical attocell networks.” 2017. Doctoral Dissertation, University of Edinburgh. Accessed April 18, 2021.
http://hdl.handle.net/1842/22868.
MLA Handbook (7th Edition):
Chen, Zhe. “Interference mitigation techniques for optical attocell networks.” 2017. Web. 18 Apr 2021.
Vancouver:
Chen Z. Interference mitigation techniques for optical attocell networks. [Internet] [Doctoral dissertation]. University of Edinburgh; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1842/22868.
Council of Science Editors:
Chen Z. Interference mitigation techniques for optical attocell networks. [Doctoral Dissertation]. University of Edinburgh; 2017. Available from: http://hdl.handle.net/1842/22868
University of Arizona
15.
Zhang, Yueteng.
Development of New Organic Photoredox Catalysis Driven by Visible Light
.
Degree: 2020, University of Arizona
URL: http://hdl.handle.net/10150/641425
► Development of efficient and sustainable synthetic technologies for molecular construction is the central goal in modern organic synthesis. In recent decades, organocatalysis has become one…
(more)
▼ Development of efficient and sustainable synthetic technologies for molecular construction is the central goal in modern organic synthesis. In recent decades, organocatalysis has become one of the viable tools in organic synthesis with notable features including easy manipulation, low cost, and/or less susceptible to air and moisture. Organophotoredox catalysis has merged as a front runner in organocatalysis. My Ph.D. study focuses on the development of novel
visible-
light mediated organic photoredox catalysis strategies for the construction of structurally diverse molecular architectures in distinct ways.
In the first efforts, a metal- and oxidant-free organophotocatalytic method for preparing structurally diverse thioesters from readily accessible, abundant aldehydes, has been realized. Excited by blue
light, the simple and cost-effective 9,10-phenanthrenequinone (PQ) promotes hydrogen atom transfer (HAT) to selectively generate acyl radicals from corresponding aldehydes without inducing crossover reactivity of thioesters. In situ formed acyl radicals then react with thiosulfonate S-esters to efficiently produce thioesters. The mild and efficient method exhibits excellent substrate scope and outstanding functional group tolerance. Significantly, it is proved to be useful in a late-stage functionalization of complex molecules.
Direct H/D exchange at formyl groups represents the most straightforward approach to C-1 deuterated aldehydes. Along this line, a new photoredox catalytic,
visible-
light mediated neutral radical approach has been developed via a unique double-HAT process. Selective control of highly reactive acyl radical enables driving the formation of deuterated products when an excess of D2O is employed. The power of H/D exchange process has been demonstrated for both aromatic aldehydes and aliphatic substrates, and more important late-stage deuterium incorporation into complex structures with uniformly high deuteration level (>90%).
The direct dearomatization of indoles represents the most straightforward access to indolines. However, the exiting dearomative methods largely restrict to electron-rich indoles or go through an ionic process using strong nucleophiles. Toward this end, an unprecedented organophotocatalytic process by harnessing nucleophilic radicals to react with electron-deficient indoles was developed. The preparative power of this radical-engaged strategy has been demonstrated by direct addition of in situ formed nucleophilic radicals from readily accessible feedstock carboxylic acids, into structurally diverse electrophilic indoles including (thio)ester, amide, ketone, nitrile and thus delivering a series of trans-2,3-disubstituted indolines with uniformly high stereoselectivity (> 20:1 dr). Moreover, this approach has also been successfully applied to other aromatic heterocycles such as pyrroles, benzofurans and benzothiophenes.
Advisors/Committee Members: Wang, Wei (advisor), Wondrak, Georg T. (committeemember), Hulme, Christopher (committeemember), Njardarson, Jon T. (committeemember).
Subjects/Keywords: Dearomatization;
Deuteration;
Organocatalysis;
Photoredox;
Thioester;
Visible light
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APA ·
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Manager
APA (6th Edition):
Zhang, Y. (2020). Development of New Organic Photoredox Catalysis Driven by Visible Light
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/641425
Chicago Manual of Style (16th Edition):
Zhang, Yueteng. “Development of New Organic Photoredox Catalysis Driven by Visible Light
.” 2020. Doctoral Dissertation, University of Arizona. Accessed April 18, 2021.
http://hdl.handle.net/10150/641425.
MLA Handbook (7th Edition):
Zhang, Yueteng. “Development of New Organic Photoredox Catalysis Driven by Visible Light
.” 2020. Web. 18 Apr 2021.
Vancouver:
Zhang Y. Development of New Organic Photoredox Catalysis Driven by Visible Light
. [Internet] [Doctoral dissertation]. University of Arizona; 2020. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10150/641425.
Council of Science Editors:
Zhang Y. Development of New Organic Photoredox Catalysis Driven by Visible Light
. [Doctoral Dissertation]. University of Arizona; 2020. Available from: http://hdl.handle.net/10150/641425
Delft University of Technology
16.
Kleingeld, Hajo (author).
Sensing human activity with dark light.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:e7804c69-5209-4e23-b085-1064edfaeae5
► Nowadays, 19% of the global energy consumption is used for lighting. For this reason, saving energy in lighting is vital. A simple way to save…
(more)
▼ Nowadays, 19% of the global energy consumption is used for lighting. For this reason, saving energy in lighting is vital. A simple way to save energy is to “simply” turn the lights off, or reduce the amount of light used when nobody is around. This thesis proposes a new method for luminaires to detect the presence of humans and objects which only uses a photodiode and a fraction of the light a luminaire normally emits, namely Dark Sensing. Dark sensing works by sending out short flashes of light. These short flashes use little energy and are barely visible to the user. These flashes get reflected by the environment and received by a photodiode placed next to the light. By extracting a key feature of the received flash, we obtain a metric representing the surrounding area. If an object enters the observed area, the reflections of light will change. These changes will be noticed by the system, which triggers a detection resulting in the light being turned on. A prototype was created which shows the potential of the newly developed method. The prototype was tested in two different environments and achieved detects between 73% and 90% of bypassing pedestrians, depending on the accepted false positive ratio (0 to 0.05).
Embedded Systems
Advisors/Committee Members: Zuñiga Zamalloa, Marco (mentor), Langendoen, Koen (graduation committee), Doerr, Christian (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Passive visible light localisation; Human activity detection
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APA ·
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Export
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Manager
APA (6th Edition):
Kleingeld, H. (. (2017). Sensing human activity with dark light. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e7804c69-5209-4e23-b085-1064edfaeae5
Chicago Manual of Style (16th Edition):
Kleingeld, Hajo (author). “Sensing human activity with dark light.” 2017. Masters Thesis, Delft University of Technology. Accessed April 18, 2021.
http://resolver.tudelft.nl/uuid:e7804c69-5209-4e23-b085-1064edfaeae5.
MLA Handbook (7th Edition):
Kleingeld, Hajo (author). “Sensing human activity with dark light.” 2017. Web. 18 Apr 2021.
Vancouver:
Kleingeld H(. Sensing human activity with dark light. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 18].
Available from: http://resolver.tudelft.nl/uuid:e7804c69-5209-4e23-b085-1064edfaeae5.
Council of Science Editors:
Kleingeld H(. Sensing human activity with dark light. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:e7804c69-5209-4e23-b085-1064edfaeae5
University of Edinburgh
17.
Olanrewaju, Hammed Gbolahan.
Study of MIMO techniques for optical wireless communications.
Degree: PhD, 2019, University of Edinburgh
URL: http://hdl.handle.net/1842/36668
► With its huge spectral resource, optical wireless communication (OWC) has emerged as a promising complementary technology to the radio frequency (RF) communication systems. OWC provides…
(more)
▼ With its huge spectral resource, optical wireless communication (OWC) has emerged as a promising complementary technology to the radio frequency (RF) communication systems. OWC provides data communications for a variety of user applications and it can be deployed using simple, low-cost, low-power and energy-efficient component. In order to enhance capacity, reliability and/or coverage of OWC, multiple-input-multiple-output (MIMO) systems are employed to exploit additional degrees of freedom, such as the location and angular orientation of optical sources and detectors. However, the implementation of MIMO systems is faced with challenges such as the strong correlation and multipath propagation in indoor OWC channels, system synchronisation, as well as inter-channel interference (ICI) due to multiple parallel data transmission. This dissertation investigates MIMO OWC systems which utilises transmission techniques with reduced complexity. A detailed study and performance evaluation of the techniques in terms of capacity, spectral efficiency and error rates is conducted through theoretical analysis, simulation and experiments. The system performance is investigated under different constraints imposed by impairments such as interference, synchronization and channel correlation. Optical spatial modulation (OSM) is studied as a low complexity technique using multiple light sources to enhance system capacity. A generalised framework for implementing OSM with energy efficient pulse position modulation scheme is devised. This framework supports other variants of OSM, and it can be adapted to satisfy varying system requirement such as spectral and energy efficiencies. The performance of the OWC system is investigated in indoor line-of-sight (LOS) propagation. The error performance of the system is analysed theoretically and matched by simulation results. Also, the system performance is evaluated with experiments to demonstrate feasibility. Furthermore, the performance of OSM MIMO techniques in the realistic indoor scenario is considered by taking into account the multiple reflections of the transmitted signal from room surfaces. This is motivated by the recent drive towards high-speed Gigabits per second (Gbps) data communication, where the inter-symbol interference (ISI) caused by the multipath propagation may pose a major bottleneck. A model of the multipath-induced ISI is presented to account for signal spreading and then applied to formulate the error performance analysis. The impact of multipath-induced power penalty and delay spread on system performance is demonstrated using their spatial distributions across the coverage area. Additionally, the impact of timing synchronization problems on the error performance of different variants of the OSM MIMO techniques is investigated. While most works related to SM have assumed a perfect synchronization among the multiple transmitter and receiver elements, such assumption pose a challenge in practical deployment. Hence, the need to examine the impact of synchronisation error that…
Subjects/Keywords: visible light communication; VLC; MIMO; optical communication
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APA (6th Edition):
Olanrewaju, H. G. (2019). Study of MIMO techniques for optical wireless communications. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/36668
Chicago Manual of Style (16th Edition):
Olanrewaju, Hammed Gbolahan. “Study of MIMO techniques for optical wireless communications.” 2019. Doctoral Dissertation, University of Edinburgh. Accessed April 18, 2021.
http://hdl.handle.net/1842/36668.
MLA Handbook (7th Edition):
Olanrewaju, Hammed Gbolahan. “Study of MIMO techniques for optical wireless communications.” 2019. Web. 18 Apr 2021.
Vancouver:
Olanrewaju HG. Study of MIMO techniques for optical wireless communications. [Internet] [Doctoral dissertation]. University of Edinburgh; 2019. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1842/36668.
Council of Science Editors:
Olanrewaju HG. Study of MIMO techniques for optical wireless communications. [Doctoral Dissertation]. University of Edinburgh; 2019. Available from: http://hdl.handle.net/1842/36668
University of New South Wales
18.
Tang, Yiming.
Development of sulphide semiconductor electrodes for visible light conversion.
Degree: Chemical Sciences & Engineering, 2015, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/54623
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35372/SOURCE02?view=true
► This work starts with the synthesis of relatively thick n-type CuInS2 film by a single-step electrodeposition followed by calcination in a mixture of N2 and…
(more)
▼ This work starts with the synthesis of relatively thick n-type CuInS2 film by a single-step electrodeposition followed by calcination in a mixture of N2 and H2 at 500 ºC without the need of toxic H2S gas for sulfurization. It was found that the heat treatment in reducing atmosphere suppresses the formation of oxide impurity of the electrodeposited Cu/In/S elements and increases the donor density of CuInS2 by increasing the sulfur vacancies at the grain surface. The resultant CuInS2 film from reducing gas calcination exhibited a fourfold enhancement in photoelectrochemical performance as compared to that from calcination in pure N2.Following the synthesis of the n-type CuInS2 film, a one-dimensional (1-D) CuInS2-ZnO composite was designed to improve the electron transport within the photoanode and capture the
visible-
light absorption for photoelectrochemical applications. Well-aligned ZnO nanorods were successfully coated with a uniform thin layer of CuInS2 nanoparticle photosensitizers using a tailored sequential pulsed-electrodeposition. The formation of CuInS2-ZnO heterojunction with well-matched band energy alignment and the superior electron mobility in ZnO nanorods led to remarkable improved photoelectrochemical performance of the electrode under
visible light irradiation. The effects of deposition sequences and pulsing frequency in the sequential pulsed electrodeposition were found to be crucial in the photoelectrochemical properties of these photoelectrodes.Besides the ternary sulphide CuInS2, binary sulphide such as CdS was also studied for the application of photoelectrodes due to its advanced
visible light activity. The last part of the thesis focuses on the development of one-dimensional CdS-ZnO composites prepared by pulsed electrodeposition with specific synthesis conditions. An ultrathin CdS film with a thickness less than 10 nm was formed on the pre-grown ZnO nanorod arrays. The CdS-ZnO heterojunction electrode yielded a significant improvement in the photoelectrochemical properties comparing to pure CdS and pristine ZnO nanorod arrays films. The application of pulsed electrodeposition in this work will provide a new platform into the development of decorating 1-D structure with various metal sulphide materials.
Advisors/Committee Members: Amal, Rose, Chemical Sciences & Engineering, Faculty of Engineering, UNSW, Ng, Yun Hau, Chemical Sciences & Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Sulphides Semiconductor; Photoelectrodes; Visible Light Conversion
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APA (6th Edition):
Tang, Y. (2015). Development of sulphide semiconductor electrodes for visible light conversion. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/54623 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35372/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Tang, Yiming. “Development of sulphide semiconductor electrodes for visible light conversion.” 2015. Doctoral Dissertation, University of New South Wales. Accessed April 18, 2021.
http://handle.unsw.edu.au/1959.4/54623 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35372/SOURCE02?view=true.
MLA Handbook (7th Edition):
Tang, Yiming. “Development of sulphide semiconductor electrodes for visible light conversion.” 2015. Web. 18 Apr 2021.
Vancouver:
Tang Y. Development of sulphide semiconductor electrodes for visible light conversion. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2021 Apr 18].
Available from: http://handle.unsw.edu.au/1959.4/54623 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35372/SOURCE02?view=true.
Council of Science Editors:
Tang Y. Development of sulphide semiconductor electrodes for visible light conversion. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/54623 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35372/SOURCE02?view=true
19.
Rodrigues, Pedro Alexandre Tavares.
Test platform for visible light positioning
.
Degree: 2019, Universidade de Aveiro
URL: http://hdl.handle.net/10773/29621
► This dissertation is addressed to location systems in indoor environments using artificial light source, based in off-the-shelf light emitting diodes, and visible light communication. It…
(more)
▼ This dissertation is addressed to location systems in indoor environments using
artificial
light source, based in off-the-shelf
light emitting diodes, and
visible
light communication. It emphasizes the study of the
light behaviour travelling
through space and the design of a current LED driver capable of producing
pulsed
light. Nowadays, most of the traditional lighting systems are being replaced
by LED lighting due to their energy efficiency. A study over artificial
light
sources is performed, specially photometry measures and their optoelectronic
properties. A lighting project has been developed to adapt a dark room with
the European lighting standards regulation, that follows a traditional lighting
project. A linear LED current driver has been designed for regulation of LED
current, continuous or pulsed mode, which allows dimming of
light intensity.
Light modulations have been studied for low bandwidth
visible light communication
system to be implemented with a microcontroller acting directly on the
current that passes through the LED. The built lighting system allows, when
communicating, modulation of each LED identification number through
light,
while performing the basic need of illumination. The modulated signals are
received by photo detectors, photo diodes or image sensor (camera), which
receives the signal, extracts the ID, and have the ability to measure a relative
distance to the emitters, using power reception (photo diodes) or image
deformation of image sensors. The adaptation of a dark room in Integrated
Circuit Systems laboratory of Instituto de Telecomunicações in Aveiro, meets
the necessary requirements for implementation and validation of VLP in real
environments.
Advisors/Committee Members: Fonseca, Pedro Nicolau Faria da (advisor), Alves, Luis Filipe Mesquita Nero Moreira (advisor).
Subjects/Keywords: Visible light positioning;
Visible light communication;
Lighting project;
Lightemitting diode;
Image sensor;
Photodiode
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APA (6th Edition):
Rodrigues, P. A. T. (2019). Test platform for visible light positioning
. (Thesis). Universidade de Aveiro. Retrieved from http://hdl.handle.net/10773/29621
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rodrigues, Pedro Alexandre Tavares. “Test platform for visible light positioning
.” 2019. Thesis, Universidade de Aveiro. Accessed April 18, 2021.
http://hdl.handle.net/10773/29621.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rodrigues, Pedro Alexandre Tavares. “Test platform for visible light positioning
.” 2019. Web. 18 Apr 2021.
Vancouver:
Rodrigues PAT. Test platform for visible light positioning
. [Internet] [Thesis]. Universidade de Aveiro; 2019. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10773/29621.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rodrigues PAT. Test platform for visible light positioning
. [Thesis]. Universidade de Aveiro; 2019. Available from: http://hdl.handle.net/10773/29621
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Rêgo, Miguel Lopes.
Visible light positioning using a camera
.
Degree: 2019, Universidade de Aveiro
URL: http://hdl.handle.net/10773/29720
► This dissertation focuses on the development of an indoor positioning system using a camera. The proposed system uses the camera as the only sensor, calculating…
(more)
▼ This dissertation focuses on the development of an indoor positioning system
using a camera. The proposed system uses the camera as the only sensor,
calculating its position in a room with properly modulated LED
light fixtures. An
initial investigation on the current technological advancements on positioning
systems is performed. Moreover,
light-based positioning systems are explored
and the usage of a camera in such a context is explained and discussed. After
that, the working principles of a camera are presented and the possibility of
using this type of sensor to perform indoor location is developed. Since the application requires it, a method of transmitting data from the
light fixtures to the
camera is also discussed. Going further, the camera geometrical model is explained, in order to clarify the mathematical principles required to perform the
positioning calculation. After that, a MATLAB script is developed, in order to
produce simulated photographs. After this, another simulation was developed,
with the objective of studying the impact of errors in the final position estimation in such a system. The program structure is presented and the results are
discussed. Finally, the complete system is implemented. After an explanation,
the final experimental positioning errors are presented and discussed.
Advisors/Committee Members: Alves, Luis Filipe Mesquita Nero Moreira (advisor), Fonseca, Pedro Nicolau Faria da (advisor).
Subjects/Keywords: Visible light positioning;
Indoor positioning systems;
Optical camera communication;
Camera;
Image sensor;
Visible light communication
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rêgo, M. L. (2019). Visible light positioning using a camera
. (Thesis). Universidade de Aveiro. Retrieved from http://hdl.handle.net/10773/29720
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rêgo, Miguel Lopes. “Visible light positioning using a camera
.” 2019. Thesis, Universidade de Aveiro. Accessed April 18, 2021.
http://hdl.handle.net/10773/29720.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rêgo, Miguel Lopes. “Visible light positioning using a camera
.” 2019. Web. 18 Apr 2021.
Vancouver:
Rêgo ML. Visible light positioning using a camera
. [Internet] [Thesis]. Universidade de Aveiro; 2019. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10773/29720.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rêgo ML. Visible light positioning using a camera
. [Thesis]. Universidade de Aveiro; 2019. Available from: http://hdl.handle.net/10773/29720
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Dalhousie University
21.
Gujjari, Durgesh.
Visible Light Communication.
Degree: Master of Applied Science, Department of Electrical & Computer
Engineering, 2012, Dalhousie University
URL: http://hdl.handle.net/10222/15478
► White LEDs (Light Emitting Diodes) in Visible Light Communication (VLC) is an emerging technology that is being researched so it can eventually be used for…
(more)
▼ White LEDs (
Light Emitting Diodes) in
Visible Light
Communication (VLC) is an emerging technology that is being
researched so it can eventually be used for common communications
systems. LEDs have a number of advantages, one of which is long
life expectancy. However, like many emerging technologies, VLC has
many technical issues that need to be addressed. We proposed an
optical indoor wireless communication system that used white LEDs
like plug-in devices. We developed a practical implementation of
VLC and demonstrated it experimentally. In particular we focused on
designing a prototype of VLC that can be used without having to
make major changes to the present infrastructure with two types of
protocol — namely RS-232 and USB — for data
transmission.
Advisors/Committee Members: Dr. Srinivas Sampalli (external-examiner), Dr. Michael Cada (graduate-coordinator), Dr. Zhizhang Chen, Dr. Srinivas Sampalli (thesis-reader), Dr. Michael Cada (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: Visible Light Communication; Light Emitting Diode;
Photodiode; Transceiver
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APA ·
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Manager
APA (6th Edition):
Gujjari, D. (2012). Visible Light Communication. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/15478
Chicago Manual of Style (16th Edition):
Gujjari, Durgesh. “Visible Light Communication.” 2012. Masters Thesis, Dalhousie University. Accessed April 18, 2021.
http://hdl.handle.net/10222/15478.
MLA Handbook (7th Edition):
Gujjari, Durgesh. “Visible Light Communication.” 2012. Web. 18 Apr 2021.
Vancouver:
Gujjari D. Visible Light Communication. [Internet] [Masters thesis]. Dalhousie University; 2012. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10222/15478.
Council of Science Editors:
Gujjari D. Visible Light Communication. [Masters Thesis]. Dalhousie University; 2012. Available from: http://hdl.handle.net/10222/15478
Universitat Rovira i Virgili
22.
Shen, Yangyang.
Visible Light Photoredox Promoted Transformations of Inert Chemical Bonds.
Degree: Departament de Química Analítica i Química Orgànica, 2018, Universitat Rovira i Virgili
URL: http://hdl.handle.net/10803/665125
► Last decade has witnessed the dramatic development of visible light photoredox catalysis, a number of previously unrecognized transformations have been nicely discovered and proceeded under…
(more)
▼ Last decade has witnessed the dramatic development of
visible light photoredox catalysis, a number of previously unrecognized transformations have been nicely discovered and proceeded under exceptionally mild conditions. Applications enabled by photoredox technique have been found in organic synthesis, pharmaceuticals and material science. However, functionalization of inert chemical bonds beyond the confined ability of conventional photocatalysts still remains less explored.
Considering the research interest of Martín’s group and the potential of new designed strategy to activate inert chemical bonds, together with the accommodating technique of photoredox, we successfully disclosed the following main challenge in photochemistry:
To expand the
visible light promoted atom transfer radical cyclization to virtually unexplored unactivated alkyl iodides.
To develop a multiple bond-forming photochemical CO2 fixation towards the synthesis of valuable phenylacetic acid with high molecular complexity.
To unlock new concept for functionalizing native sp3 C-H bonds with the synergy of diaryl ketone and nickel catalyst.
Advisors/Committee Members: [email protected] (authoremail), true (authoremailshow), Martín Romo, Rubén, (director).
Subjects/Keywords: Llum Visible; Fotoredox; Radical Addición; Luz Visible; Visible Light; Photoredox; Radical Addition; Ciències; 54; 542; 543; 547
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to Zotero / EndNote / Reference
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APA (6th Edition):
Shen, Y. (2018). Visible Light Photoredox Promoted Transformations of Inert Chemical Bonds. (Thesis). Universitat Rovira i Virgili. Retrieved from http://hdl.handle.net/10803/665125
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shen, Yangyang. “Visible Light Photoredox Promoted Transformations of Inert Chemical Bonds.” 2018. Thesis, Universitat Rovira i Virgili. Accessed April 18, 2021.
http://hdl.handle.net/10803/665125.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shen, Yangyang. “Visible Light Photoredox Promoted Transformations of Inert Chemical Bonds.” 2018. Web. 18 Apr 2021.
Vancouver:
Shen Y. Visible Light Photoredox Promoted Transformations of Inert Chemical Bonds. [Internet] [Thesis]. Universitat Rovira i Virgili; 2018. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10803/665125.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shen Y. Visible Light Photoredox Promoted Transformations of Inert Chemical Bonds. [Thesis]. Universitat Rovira i Virgili; 2018. Available from: http://hdl.handle.net/10803/665125
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
23.
Zhang, Weizhi.
Indoor Optical Positioning System.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/22572
► Indoor positioning has become an attractive research topic within the past two decades. However, no satisfying solution has been found with consideration of both accuracy…
(more)
▼ Indoor positioning has become an attractive research topic within the past two decades. However, no satisfying solution has been found with consideration of both accuracy and system complexity. Recently, research on
visible light communications offers new opportunities on realizing accurate indoor positioning with relatively simple system configuration. This dissertation investigates several fundamental research topics of indoor positioning systems based on
visible light communications (VLC) technology.
First, we introduce a simulation method to generate optical wireless channel impulse response more efficiently and accurately, based on which a novel 2-D positioning algorithm is developed. Using basic framed slotted ALOHA (BFSA) protocol, it successfully addresses channel multi-access issue, removing synchronization requirement on the transmitters. The algorithm makes use of received signal strength (RSS) to calculate the ranges from receiver to
light-emitting diode (LED) bulbs, after which trilateration is performed to obtain estimation of the receiver’s location. Simulation results show that, with over 95% confidence, the target receiver can be located with an accuracy of 5.9 cm, assuming indirect sunlight exposure and proper installation of LED bulbs.
The dissertation also explores one of the main digital signal processing techniques available: digital filters. Three filtering techniques are employed to improve the positioning accuracy: Kalman filter, sequential importance-resampling particle filter (SIR-PF) and Gaussian mixture sigma-point particle filter (GM-SPPF). Filtering techniques are used to form the trajectory of the receiver while rejecting wild values which are large deviations from correct measurements. Results show that filters help increase the positioning accuracy and Gaussian mixture sigma-point particle filter (GM-SPPF) outperforms other filters such as basic Kalman filter and particle filter (SIR-PF), at a reasonable computational cost.
3-D positioning algorithm is then proposed to keep track of the receiver’s height. Simulation results show that the height of receiver can be estimated as accurately as within ten centimeters. Results also show that the estimation is more accurate when
light distribution from LED bulbs involved are uniform.
Finally, sensor fusion technology is adopted as a solution to blockage problem and an option to further improve the positioning accuracy.
Advisors/Committee Members: Mohsen Kavehrad, Dissertation Advisor/Co-Advisor, Mohsen Kavehrad, Committee Chair/Co-Chair, Shizhuo Yin, Committee Member, Zhiwen Liu, Committee Member, Jian Xu, Committee Member.
Subjects/Keywords: Light emitting diode; visible light communications; indoor positioning; Kalman filter; sensor fusion
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to Zotero / EndNote / Reference
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APA (6th Edition):
Zhang, W. (2014). Indoor Optical Positioning System. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22572
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhang, Weizhi. “Indoor Optical Positioning System.” 2014. Thesis, Penn State University. Accessed April 18, 2021.
https://submit-etda.libraries.psu.edu/catalog/22572.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Weizhi. “Indoor Optical Positioning System.” 2014. Web. 18 Apr 2021.
Vancouver:
Zhang W. Indoor Optical Positioning System. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Apr 18].
Available from: https://submit-etda.libraries.psu.edu/catalog/22572.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang W. Indoor Optical Positioning System. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22572
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Kansas State University
24.
Gude, Kelly Marie.
Altering
solar light with high tunnel coverings to improve health-promoting
phytochemicals of lettuce and tomato.
Degree: PhD, Department of Horticulture and
Natural Resources, 2020, Kansas State University
URL: http://hdl.handle.net/2097/40741
► High tunnels (HTs) have shown to increase marketability and yield of numerous crops compared to open field production. These structures alter light by utilizing specific…
(more)
▼ High tunnels (HTs) have shown to increase
marketability and yield of numerous crops compared to open field
production. These structures alter
light by utilizing specific
polyethylene (poly) films and/or shade cloth, which may negatively
affect phytochemical accumulation. This study evaluated the effect
of HT coverings on the microclimate, yield, sensory attributes, and
phytochemical concentration of tomato (Solanum lycopersicum cv. BHN
589) and lettuce (Lactuca sativa cv. Two Star, New Red Fire). Field
experiments were carried out at the Kansas State University Olathe
Horticulture Center in consecutive years from fall 2017 to spring
2019. An adjacent, open field (open) bed was used during the
descriptive sensory study. The six HT coverings included standard,
UV-stabilized poly (standard); diffuse poly (diffuse);
full-spectrum clear poly (clear); UV-A/B blocking poly (block);
standard + 55% shade cloth (shade); and removal of standard poly 2
to 3 weeks prior to initial harvest to simulate a movable tunnel
(movable). The microclimate measurements of photosynthetic active
radiation (PAR) were highest under the movable covering, and
exceeded the diffuse and shade covering in the spring and summer
seasons. During the fall, a decrease in available PAR, net
photosynthesis (Pn), soil and canopy temperatures were observed
under all tested coverings, minimizing the effect of the coverings.
The coverings with higher soil temperatures in the spring and
summer resulted in greater yields of lettuce and tomato.
Phytochemical concentration of ascorbic acid (AsA), flavonoids, and
phenolic acids were measured in breaker and
light red mature fruit
at harvest and throughout ripening in tomato and at harvest and
after storage in lettuce. For tomato, the fruit under the clear and
standard covering increased in AsA compared to the shade and
movable coverings. The flavonoids, quercetin and rutin, increased
with on-plant ripening, i.e.
light red harvested fruit once
reaching mature red was higher in concentration compared to breaker
harvested fruit once reaching mature red. In the spring red and
green lettuce, the flavonoid concentration of isoquercetin and
rutin increased under the clear and movable covering. During the
fall, a decrease in individual phenolic compounds was observed for
both red and green lettuce. Sensory attributes of fall red lettuce
were evaluated with a descriptive study at the Center for Sensory
Analysis and Consumer Behavior in Manhattan, KS. The lettuce under
the open, clear, and movable coverings had redder pigmented leaves
relative to the other coverings as determined by both the panelists
and instrumental analysis. Results from PCA analysis show a cluster
was formed with the movable, clear, and open coverings, and 73% of
the perceived variability between the HT coverings was due mostly
to color intensity. The results of this work indicate that HTs can
significantly alter solar
light and temperature, thus altering
yield and health-promoting phytochemical concentration of lettuce
and tomato and perceived sensory…
Advisors/Committee Members: Eleni PliakoniChanna B. Rajashekar.
Subjects/Keywords: Hoop-house; Season
Extension;
Lexicon;
Ultra-violet light; Visible
light; Postharvest
quality
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gude, K. M. (2020). Altering
solar light with high tunnel coverings to improve health-promoting
phytochemicals of lettuce and tomato. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/40741
Chicago Manual of Style (16th Edition):
Gude, Kelly Marie. “Altering
solar light with high tunnel coverings to improve health-promoting
phytochemicals of lettuce and tomato.” 2020. Doctoral Dissertation, Kansas State University. Accessed April 18, 2021.
http://hdl.handle.net/2097/40741.
MLA Handbook (7th Edition):
Gude, Kelly Marie. “Altering
solar light with high tunnel coverings to improve health-promoting
phytochemicals of lettuce and tomato.” 2020. Web. 18 Apr 2021.
Vancouver:
Gude KM. Altering
solar light with high tunnel coverings to improve health-promoting
phytochemicals of lettuce and tomato. [Internet] [Doctoral dissertation]. Kansas State University; 2020. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/2097/40741.
Council of Science Editors:
Gude KM. Altering
solar light with high tunnel coverings to improve health-promoting
phytochemicals of lettuce and tomato. [Doctoral Dissertation]. Kansas State University; 2020. Available from: http://hdl.handle.net/2097/40741
Australian National University
25.
Zavaleta Fernandez de Cordova, Alonso.
Spectroscopic studies of photodamage and photoprotection of photosystem II
.
Degree: 2016, Australian National University
URL: http://hdl.handle.net/1885/109164
► Light is required for photosynthesis to occur, but it also has a deleterious effect by damaging the photosynthetic machinery, in particular Photosystem II (PSII). Photoinhibition…
(more)
▼ Light is required for photosynthesis to occur, but it also has a deleterious effect by damaging the photosynthetic machinery, in particular Photosystem II (PSII). Photoinhibition of PSII is a complex process, balancing between photoinactivation, protective and repair mechanisms. Current understanding of photodamage is limited to competing hypotheses where the photosensitizer is either photosynthetic pigments or the Mn4CaO5 cluster itself, with little consensus on the mechanisms and consequences of PSII photoinactivation. Using different spectroscopic techniques, the author evaluated the mechanisms of photodamage and photoprotection of PSII under visible light. In the first Chapter a critical examination is presented of current evidence about the photodamage mechanisms, in particular that related to the action spectra of photodamage. The second Chapter examines if the damage to the Mn4CaO5 cluster is applicable to PSII under visible light as manganese absorbs visible light only weakly. The third Chapter was intended to determine which of the three main events of PSII photodamage occurs first: (1) Inactivation of the oxygen evolution; (2) inactivation of the PSII RC; (3) and release of Mn ions. The fourth Chapter evaluates whether quenching of excessive excitation does protect PSII from photodamage, as the recent rise of paradigms that advocate that photodamage is independent of excessive excitation has questioned the relevance of quenching mechanisms. Finally, the fifth Chapter discusses and integrates the result of the present thesis in the context of the current hypothesis to explain PSII photodamage. The main results of this work are: (1) visible light damages Mn4CaO5 cluster prior to photodamage to the PSII reaction center; (2) the two step model under visible light is explained mostly by limitations on the acceptor side; (3) release of Mn ions is not the cause of PSII inactivation but a later consequence; and (4) the discovery of a long-lived fluorescence quencher that accumulates faster than the light-induced loss of PSII efficiency shows that the induction of this quencher is a preventive mechanism to reduce the excitation pressure and not the consequence of photodamage. Upon critical examination of the previously reported evidence and the new discoveries in the present work, the hybrid mechanism of photoinactivation, sensitized mostly by photosynthetic pigments and in minor way the Mn4CaO5, is the most plausible explanation to PSII photodamage under visible light.
Subjects/Keywords: Photosystem II;
Photodamage;
Photoprotection;
Photoinhibition;
Spectroscopy;
light;
photosynthesis;
visible light;
fluorescence;
chlorophyll
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APA (6th Edition):
Zavaleta Fernandez de Cordova, A. (2016). Spectroscopic studies of photodamage and photoprotection of photosystem II
. (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/109164
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zavaleta Fernandez de Cordova, Alonso. “Spectroscopic studies of photodamage and photoprotection of photosystem II
.” 2016. Thesis, Australian National University. Accessed April 18, 2021.
http://hdl.handle.net/1885/109164.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zavaleta Fernandez de Cordova, Alonso. “Spectroscopic studies of photodamage and photoprotection of photosystem II
.” 2016. Web. 18 Apr 2021.
Vancouver:
Zavaleta Fernandez de Cordova A. Spectroscopic studies of photodamage and photoprotection of photosystem II
. [Internet] [Thesis]. Australian National University; 2016. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1885/109164.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zavaleta Fernandez de Cordova A. Spectroscopic studies of photodamage and photoprotection of photosystem II
. [Thesis]. Australian National University; 2016. Available from: http://hdl.handle.net/1885/109164
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
26.
Hu, Cheng-Ching.
Synthesis and Characterization of Nitrogen and Tungsten Doped Titanium Dioxide for Photocatalytic Application in Visible-light Region.
Degree: PhD, Materials and Optoelectronic Science, 2013, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0603113-154334
► This dissertation consisits of two sections regarding the visible light driven photocatalysts based upon nitrogen doped and nitrogen tungsten codoped titania. The first Chapter 1…
(more)
▼ This dissertation consisits of two sections regarding the
visible light driven photocatalysts based upon nitrogen doped and nitrogen tungsten codoped titania. The first Chapter 1 to Chapter 3 emphasized relvent backround of photocatalysis and metal or non-metal doped titania. Within Chapter 4, a sphere-like W,N-codoped TiO2 photocatalysts were prepared by a simple one-pot synthesis route. The morphology and microstructure characteristics of W,N-codoped titania photocatalysts with different amount of tungsten doping were characterized by means of XRD, BET, SEM, XPS, DRS and UVâvis. The metal and nonmetal codoped W,N-TiO2 sample shows the photocatalytic activity, which is much superior to the commercial titania P25 and undoped titania under
visible light irradiation. The probable mechanism of codoping effect is proposed. The tungsten ions with changing valences in the W,N-TiO2 samples are considered to act as trapping sites, which will effectively decrease the recombination rate of photo-induced electrons and holes and then increase the photo-oxidation efficiency of the catalysts. The second section in Chapter 5 and Chapter 6 regards a facile one-step cohydrothermal synthesis via urea treatment has been adopted to prepare a series of nitrogen-doped titanate nanotubes with highly efficient
visible light photocatalysis of rhodamine B, in an effect to identify the effect of nitrogen doping on the photodegradation efficiency. The morphology and microstructure of the thus-prepared N-doped titanates were characterized by nitrogen adsorption/desorption isotherms, transmission electron microscopy, and scanning electron microscopy. With increasing urea loadings, the N-doped titanates change from a porous multi-layer and nanotube-shaped to a dense and aggregated particle-shaped structure, accompanied with reduced specific surface area and pore volume and enhanced pore diameter. Interstitial linkage to titanate via Ti-O-N and Ti-N-O is confirmed by X-ray photoelectron spectroscopy. Factors governing the photocatalytic degradation such as the specific surface area of the catalyst and the degradation pathway are analyzed, a mechanistic illustration on the photodegradation is provided, and a 3-stage degradation mechanism is identified. The synergistic contribution due to the enhanced deethylation and chromophore cleavage on rhodamine B molecules and the reduced band gap on the catalyst TiO2 by interstitial nitrogen-doping has been accounted for the high photodegradation efficiency of the N-doped titanate nanotubes.
Advisors/Committee Members: Li-Heng Kao (chair), Tzu-Chien Hsu (committee member), Bing-Hwai Hwang (chair), Wei-Hung Su (chair), Jeh-Jeng Wang (chair).
Subjects/Keywords: Visible light photocatalysis; Deethylation; Cohydrothermal; titanate nanotube; Nitrogen Tungsten Co-doped
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APA (6th Edition):
Hu, C. (2013). Synthesis and Characterization of Nitrogen and Tungsten Doped Titanium Dioxide for Photocatalytic Application in Visible-light Region. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0603113-154334
Chicago Manual of Style (16th Edition):
Hu, Cheng-Ching. “Synthesis and Characterization of Nitrogen and Tungsten Doped Titanium Dioxide for Photocatalytic Application in Visible-light Region.” 2013. Doctoral Dissertation, NSYSU. Accessed April 18, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0603113-154334.
MLA Handbook (7th Edition):
Hu, Cheng-Ching. “Synthesis and Characterization of Nitrogen and Tungsten Doped Titanium Dioxide for Photocatalytic Application in Visible-light Region.” 2013. Web. 18 Apr 2021.
Vancouver:
Hu C. Synthesis and Characterization of Nitrogen and Tungsten Doped Titanium Dioxide for Photocatalytic Application in Visible-light Region. [Internet] [Doctoral dissertation]. NSYSU; 2013. [cited 2021 Apr 18].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0603113-154334.
Council of Science Editors:
Hu C. Synthesis and Characterization of Nitrogen and Tungsten Doped Titanium Dioxide for Photocatalytic Application in Visible-light Region. [Doctoral Dissertation]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0603113-154334
NSYSU
27.
Chen, Chang-Yu.
Synthesis of Nitrogen and Tungsten Codoped Titanate Nanotube Prepared by Hydrothermal Process for Photocatalytic Applications in Visible-light Region.
Degree: Master, Materials and Optoelectronic Science, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0616114-155605
► The nitrogen- and tungsten-doped titanate nanotubes were prepared by the hydrothermal synthesis route, using the commercial P25 as TiO2 sources, urea and ammonium tungsten as…
(more)
▼ The nitrogen- and tungsten-doped titanate nanotubes were prepared by the hydrothermal synthesis route, using the commercial P25 as TiO2 sources, urea and ammonium tungsten as the nitrogen and tungsten sources. The UV-Vis absorption and the band gap of the N,W-doped titanate nanotubes were conducted by UV/Vis spectrophotometry. It was proven that N,W-doped titanate nanotubes were successfully synthesized. Microstructual characterization of N,W-doped titanate nanotubes with different amount of tungsten doping were performed by powder X-ray diffraction (XRD), surface area and porosity analyzer (BET), X-ray photoelectron spectrometry (XPS), diffuse reflectance spectroscopy (DRS), and UV/Vis spectrophotometry. The photocatalytic activity of N,W-doped titanate nanotubes with different amount of tungsten doping were evaluated by decomposition of rhodamine B dye solution under
visible light. It was found that the degradation of rhodamine B of the N,W-doped titanate nanotubes were higher than the undoped titanate nanotubes up to 30%. The function of nitrogen and tungsten doping was found to form the new mid-gap states and to narrow the band gap of the photocatalysts, thus decreasing the recombination of electrons and holes and meanwhile increasing the efficiency of photocatalytic activity.
Advisors/Committee Members: Li-Heng Kao (chair), Bing-Hwait Hwang (chair), Tzu-chien Hsu (committee member).
Subjects/Keywords: hydrothermal; N,W-doped titanate nanotubes; rhodamine B; visible-light photocatalysis
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APA (6th Edition):
Chen, C. (2014). Synthesis of Nitrogen and Tungsten Codoped Titanate Nanotube Prepared by Hydrothermal Process for Photocatalytic Applications in Visible-light Region. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0616114-155605
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Chang-Yu. “Synthesis of Nitrogen and Tungsten Codoped Titanate Nanotube Prepared by Hydrothermal Process for Photocatalytic Applications in Visible-light Region.” 2014. Thesis, NSYSU. Accessed April 18, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0616114-155605.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Chang-Yu. “Synthesis of Nitrogen and Tungsten Codoped Titanate Nanotube Prepared by Hydrothermal Process for Photocatalytic Applications in Visible-light Region.” 2014. Web. 18 Apr 2021.
Vancouver:
Chen C. Synthesis of Nitrogen and Tungsten Codoped Titanate Nanotube Prepared by Hydrothermal Process for Photocatalytic Applications in Visible-light Region. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Apr 18].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0616114-155605.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen C. Synthesis of Nitrogen and Tungsten Codoped Titanate Nanotube Prepared by Hydrothermal Process for Photocatalytic Applications in Visible-light Region. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0616114-155605
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
28.
Lu, Shan-Yu.
Synthesis and Characterization of Nitrogen-Doped Titanate Nanotube for Photocatalytic Applications in Visible-light Region.
Degree: Master, Materials and Optoelectronic Science, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-084818
► Nitrogen-doped TiO2 nanotubes with enhanced visible light photocatalytic activity have been synthesized using commercial titania P25 as raw material by a facile P25/urea co-hydrothermal method.…
(more)
▼ Nitrogen-doped TiO2 nanotubes with enhanced
visible light photocatalytic activity have been synthesized using commercial titania P25 as raw material by a facile P25/urea co-hydrothermal method. Morphological and microstructual characteristics were conducted by transmission electron microscopy, powder X-ray diffraction, and nitrogen adsorption/desorption isotherms; chemical identifications were performed using X-ray photoelectron spectroscopy, and the interstitial nitrogen linkage to the TiO2 nanotubes is identified. The photocatalytic activity of all nitrogen-doped TiO2 nanotubes synthesized by different urea content, evaluated by the decomposition of rhodamine B dye solution under
visible light using UVâVis absorption spectroscopy, is found to exhibit higher degradation rate than that of P25. Factors affecting the photocatalytic activity of RB were analyzed and a possible mechanism of photodegradation was also proposed. The high photocatalytic activity was attributed to the process of two different mechanisms, one was the direct degradation of the chromophoric system and the other was successive deethylation of the four ethyl groups.
Advisors/Committee Members: Li-Heng Kao (chair), Bing-Hwai Hwang (chair), Hung-Yang Lu (chair), Tzu-Chien Hsu (committee member).
Subjects/Keywords: deethylation; visible light photocatalysis; nanotubes; Nitrogen-doped TiO2
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Lu, S. (2012). Synthesis and Characterization of Nitrogen-Doped Titanate Nanotube for Photocatalytic Applications in Visible-light Region. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-084818
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lu, Shan-Yu. “Synthesis and Characterization of Nitrogen-Doped Titanate Nanotube for Photocatalytic Applications in Visible-light Region.” 2012. Thesis, NSYSU. Accessed April 18, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-084818.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lu, Shan-Yu. “Synthesis and Characterization of Nitrogen-Doped Titanate Nanotube for Photocatalytic Applications in Visible-light Region.” 2012. Web. 18 Apr 2021.
Vancouver:
Lu S. Synthesis and Characterization of Nitrogen-Doped Titanate Nanotube for Photocatalytic Applications in Visible-light Region. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Apr 18].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-084818.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lu S. Synthesis and Characterization of Nitrogen-Doped Titanate Nanotube for Photocatalytic Applications in Visible-light Region. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704112-084818
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California – Riverside
29.
Li, Zening.
Indoor Positioning System Using Visible Light Communication and Smartphone With Rolling Shutter Camera.
Degree: Electrical Engineering, 2016, University of California – Riverside
URL: http://www.escholarship.org/uc/item/4280x06f
► Indoor positioning systems provide location based service within buildings. Because the Global Positioning System is usually unavailable in indoor environment, other positioning technologies making use…
(more)
▼ Indoor positioning systems provide location based service within buildings. Because the Global Positioning System is usually unavailable in indoor environment, other positioning technologies making use of optical, radio or even acoustic techniques are used for indoor positioning application. In this dissertation, an indoor visible light communication positioning system using a smartphone with rolling shutter camera is proposed. The LED transmits periodical signals with different frequencies high enough to avoid flickering as its optical tags. The camera exploits the rolling shutter effect to detect the fundamental frequency of optical signals. This kind of systems use smartphone camera as the receiver with no requirement of extra hardware. And at the same time, the optical communication link allows a date rate much higher than the frame rates of traditional optical camera communication. For the work of this research topic carried out so far, the roles of camera parameters determining rolling effect performance are studied and a technique to measure the camera readout time per column is presented. Factors limiting the detectable frequency range is explained based on the discussion of rolling shutter mechanism. Followed is the analysis of frequency detection reliability and resolution with Fourier spectrum analysis. After that, we present a background removal algorithm to recover the modulated information from background interference. In our algorithm, only one extra image is used and a one-time image alignment is required. Linear filter performs poorly in this case because the image with rolling shutter effect is a multiplication of modulated signal and the reflectance of the scene. Therefore we use background division rather than background subtraction to remove the background interference. The modulated illumination pattern is analyzed and the performance of background removal is evaluated by experiments. The experiment result shows that the interference is significantly compressed after background removal. After the LED ID being detected successfully, an indoor positioning algorithm is proposed using multi-view imaging geometry with built-in smartphone inertial sensors. Due to the narrow field of view (FOV) of camera and the illumination placement of buildings, there is usually only one LED can be captured within camera FOV at the same time. In our proposed algorithm, only one detected LED with known position and one camera are required. And this system can still work when the VLC link is temporarily blocked or the LED temporarily moves out of the camera FOV. Another advantage of proposed algorithm is that no additional accessory will be needed except those sensors built inside the smartphone. In addition, the position is calculated at the receiver end without the knowledge of transmitter specifications, therefore there is no privacy concerns. The low-cost built in IMU sensor exhibits significant systematic errors, axes misalignment and noisy measurement. Even though a IMU calibration process can eliminate the…
Subjects/Keywords: Electrical engineering; IMU; Kalman filter; positioning; rolling shutter; visible light communication
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APA (6th Edition):
Li, Z. (2016). Indoor Positioning System Using Visible Light Communication and Smartphone With Rolling Shutter Camera. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/4280x06f
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Li, Zening. “Indoor Positioning System Using Visible Light Communication and Smartphone With Rolling Shutter Camera.” 2016. Thesis, University of California – Riverside. Accessed April 18, 2021.
http://www.escholarship.org/uc/item/4280x06f.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Li, Zening. “Indoor Positioning System Using Visible Light Communication and Smartphone With Rolling Shutter Camera.” 2016. Web. 18 Apr 2021.
Vancouver:
Li Z. Indoor Positioning System Using Visible Light Communication and Smartphone With Rolling Shutter Camera. [Internet] [Thesis]. University of California – Riverside; 2016. [cited 2021 Apr 18].
Available from: http://www.escholarship.org/uc/item/4280x06f.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Li Z. Indoor Positioning System Using Visible Light Communication and Smartphone With Rolling Shutter Camera. [Thesis]. University of California – Riverside; 2016. Available from: http://www.escholarship.org/uc/item/4280x06f
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Zhang, Qitao.
Graphitic Carbon Nitride-based Nanohybrid Photocatalysts with Enhanced Photocatalytic Performance under Visible Light Irradiation : グラファイト型窒化炭素を用いた高活性可視光応答型ナノハイブリット光触媒の開発に関する研究.
Degree: 博士（工学）, 2017, Kyushu Institute of Technology / 九州工業大学
URL: http://hdl.handle.net/10228/00006313
九州工業大学博士学位論文 学位記番号:工博甲第437号 学位授与年月日:平成29年3月24日
1 General Introduction|2 Preparation and properties of pristine g-C3N4 bulks|3 Morphology engineering of g-C3N4 by physicochemical modification|4 Extended visible light absorption of g-C3N4 by bandgap engineering|5 Construction of g-C3N4-based nanohybrid heterojunctions|6 General Conclusions
平成28年度
Advisors/Committee Members: 横野, 照尚.Subjects/Keywords: Graphitic Carbon Nitride; Nanohybrid Photocatalysts; Visible Light Irradiation
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APA (6th Edition):
Zhang, . Q. (2017). Graphitic Carbon Nitride-based Nanohybrid Photocatalysts with Enhanced Photocatalytic Performance under Visible Light Irradiation : グラファイト型窒化炭素を用いた高活性可視光応答型ナノハイブリット光触媒の開発に関する研究. (Thesis). Kyushu Institute of Technology / 九州工業大学. Retrieved from http://hdl.handle.net/10228/00006313
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhang, Qitao. “Graphitic Carbon Nitride-based Nanohybrid Photocatalysts with Enhanced Photocatalytic Performance under Visible Light Irradiation : グラファイト型窒化炭素を用いた高活性可視光応答型ナノハイブリット光触媒の開発に関する研究.” 2017. Thesis, Kyushu Institute of Technology / 九州工業大学. Accessed April 18, 2021.
http://hdl.handle.net/10228/00006313.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Qitao. “Graphitic Carbon Nitride-based Nanohybrid Photocatalysts with Enhanced Photocatalytic Performance under Visible Light Irradiation : グラファイト型窒化炭素を用いた高活性可視光応答型ナノハイブリット光触媒の開発に関する研究.” 2017. Web. 18 Apr 2021.
Vancouver:
Zhang Q. Graphitic Carbon Nitride-based Nanohybrid Photocatalysts with Enhanced Photocatalytic Performance under Visible Light Irradiation : グラファイト型窒化炭素を用いた高活性可視光応答型ナノハイブリット光触媒の開発に関する研究. [Internet] [Thesis]. Kyushu Institute of Technology / 九州工業大学; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10228/00006313.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang Q. Graphitic Carbon Nitride-based Nanohybrid Photocatalysts with Enhanced Photocatalytic Performance under Visible Light Irradiation : グラファイト型窒化炭素を用いた高活性可視光応答型ナノハイブリット光触媒の開発に関する研究. [Thesis]. Kyushu Institute of Technology / 九州工業大学; 2017. Available from: http://hdl.handle.net/10228/00006313
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] [6] [7] [8] [9] ▶
. 
Open Access Theses and Dissertations
