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Delft University of Technology
1.
Anggrit Dewangkara Yudha Pinangkis, Anggrit (author).
Uniform Gain Beamforming in 60 GHz Communications.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:0b03cc39-d73f-4e99-a896-a2b60d77ce01 
► Wireless data traffic is growing rapidly as the number of mobile devices increase and video contents become more popular. As 2.4\,GHz and 5\,GHz band communications…
(more)
▼ Wireless data traffic is growing rapidly as the number of mobile devices increase and video contents become more popular. As 2.4\,GHz and 5\,GHz band communications only provide limited bandwidth, these frequency bands cannot support the demand of ultra-high data rate. Millimeter-wave (mmWave) communications promise massive available bandwidth to support the next generation of wireless communications (e.g. 5G and the next Wi-Fi standard) such as 60\,GHz band that offers 7\,GHz available bandwidth. This extremely high frequency (EHF) band not only provides large available bandwidth, but it also experiences more losses than in 2.4 GHz and 5\,GHz band communications. With such excessive path loss challenge, mmWave communications employ beamforming to compensate the losses. Switched beamforming, which is performed in the media access layer (MAC), is preferred due to its low computational complexity compared to adaptive beamforming. However, to avoid high beam training overhead, beam-searching algorithm in the MAC layer beamforming must be chosen appropriately. Beam-searching protocol in IEEE 802.15.3c and IEEE 802.11ad, which exploit two-level of beam-searching, still can experience high training overhead if narrow beams are used. Therefore, hierarchical beam-searching algorithms are proposed to reduce training packet overhead. In our approach, hierarchical beam-searching approach with two beam candidates at each level of beam-searching is chosen to minimize the number of training packets. These beam candidates then transmit training packets giving signal quality information of each beam so that the best beam can be selected. Some beamforming techniques have already been proposed to follow hierarchical beam-searching algorithm. However, the prior beamforming techniques do not consider non-isotropic array element beam pattern. As a result, the gain follows array element beam pattern where the gain weaken at the angle direction close to the end-fire direction following beam pattern of a single patch antenna element. In this thesis, we propose a beamforming technique that has uniform gain within the scanning coverage even with the non-isotropic element patterns. To the best our knowledge, our proposed beamforming is the first work that considers a realistic element beam pattern in mmWave communications. The proposed beamforming requires flexible antenna weight vectors (AWVs) and more antenna elements than IEEE 802.15.3c or discrete Fourier transform (DFT) based beamforming. Due to flexibility value of AWVs, the AWVs must be done in the digital domain. However, digital beamforming requires a large number of radio frequency (RF) chains. Therefore, hybrid beamforming is chosen to solve the problem. We show that we achieve uniform gains with reasonable complexity.
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Chandra, Kishor (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: beamforming; mmWave; 60 Ghz; beam codebook
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APA (6th Edition):
Anggrit Dewangkara Yudha Pinangkis, A. (. (2017). Uniform Gain Beamforming in 60 GHz Communications. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0b03cc39-d73f-4e99-a896-a2b60d77ce01
Chicago Manual of Style (16th Edition):
Anggrit Dewangkara Yudha Pinangkis, Anggrit (author). “Uniform Gain Beamforming in 60 GHz Communications.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:0b03cc39-d73f-4e99-a896-a2b60d77ce01.
MLA Handbook (7th Edition):
Anggrit Dewangkara Yudha Pinangkis, Anggrit (author). “Uniform Gain Beamforming in 60 GHz Communications.” 2017. Web. 05 Mar 2021.
Vancouver:
Anggrit Dewangkara Yudha Pinangkis A(. Uniform Gain Beamforming in 60 GHz Communications. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:0b03cc39-d73f-4e99-a896-a2b60d77ce01.
Council of Science Editors:
Anggrit Dewangkara Yudha Pinangkis A(. Uniform Gain Beamforming in 60 GHz Communications. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:0b03cc39-d73f-4e99-a896-a2b60d77ce01
Delft University of Technology
2.
Lew, Duncan (author).
Integration of V2H/V2G Towards Effective Demand-Response Programs.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:ab935819-ddca-491d-8977-b9037d6d7859
► Increasing adoption of EVs in the next few decades is going to present new challenges such as EV charging creating a new and significant demand…
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▼ Increasing adoption of EVs in the next few decades is going to present new challenges such as EV charging creating a new and significant demand on the grid. The purpose of this thesis is to create a system that intelligently schedules the charging of EVs while considering the cost of energy and the discomfort of the user. At any given moment, 90% of vehicles are parked and have a huge energy source left unused. EVs could also be used as power sources for vehicle-to-home/vehicle-to-grid (V2H/V2G) to benefit from them during high demand of energy. This way the power plants would see almost a constant demand and usage, in the long run, making them more efficient. This thesis uses a non-intrusive data-driven technique to create a occu- pancy and EV charging model of the household. Smart meters in each household collect power usage data. From this power usage data we de- termine occupancy and EV charge sessions. The next step is to determine temporal metrics for occupancy and EV charge sessions. The temporal met- rics study the likelihood for occupancy or an EV charge session to occur or to switch from one state to another. Because there are differences between weekday/weekend and seasonal power usage, we have decided to create tem- poral metrics for each time period. The next step is to create the EV charging algorithm and V2H/V2G algorithms. These algorithms require a flexibility window. This window indicates in which hours the EV can be charged. Which hours of the flexib- ility window are chosen, depends on the type of objective. We have created three objectives: cost minimization, comfort maximization and joint object- ive. The V2H/V2G algorithm is executed when the state of charge (SoC) of the EV is higher than the SoC boundary. In order to measure the performance of the algorithm, we have created two metrics: relative savings and miss rate. The miss rate measures how an hour was scheduled for EV charging but failed. During the testing of the algorithm, we found that only the objective cost minimization was deemed useful. Each objective uses a flexibility window and we conclude that the user’s preferences are already taken into account during the creation of this window. For the execution of the EV charge scheduling algorithm, a max- imum relative savings can be achieved of 27% and a maximum miss rate of 11.1%. By choosing the SoC boundary value of 60% for V2H, maximum relative savings of 9.9% and a maximum miss rate of 5.2% can be achieved. V2G execution had a negligible effect on the relative savings and miss rate because the pricing dataset did not contain many price surges.
Embedded Systems
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: V2H; V2G; EV; charging; Algorithm
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APA (6th Edition):
Lew, D. (. (2017). Integration of V2H/V2G Towards Effective Demand-Response Programs. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:ab935819-ddca-491d-8977-b9037d6d7859
Chicago Manual of Style (16th Edition):
Lew, Duncan (author). “Integration of V2H/V2G Towards Effective Demand-Response Programs.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:ab935819-ddca-491d-8977-b9037d6d7859.
MLA Handbook (7th Edition):
Lew, Duncan (author). “Integration of V2H/V2G Towards Effective Demand-Response Programs.” 2017. Web. 05 Mar 2021.
Vancouver:
Lew D(. Integration of V2H/V2G Towards Effective Demand-Response Programs. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:ab935819-ddca-491d-8977-b9037d6d7859.
Council of Science Editors:
Lew D(. Integration of V2H/V2G Towards Effective Demand-Response Programs. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:ab935819-ddca-491d-8977-b9037d6d7859
Delft University of Technology
3.
Tawde, Gauri (author).
Scalability in LoRaWAN.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:1d4d4125-52fd-4304-a7ba-c28244af8a59
► This work is a study into the channel throughput produced by a single channel LoRaWAN gateway under various traffic load conditions. The use of CSMA…
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▼ This work is a study into the channel throughput produced by a single channel LoRaWAN gateway under various traffic load conditions. The use of CSMA protocols has been proposed in heavy traffic conditions when ALOHA protocol starts to fail. Three network scenarios - Centralized, Distributed and Hybrid were envisioned in which p-CSMA and np-CSMA techniques were applied. Event-driven simulations were developed to analyze and compare their throughput and energy results. As LoRaWAN does not inherently possess carrier sensing, the CAD mode in LoRaWAN was studied and applied. This study provides insights into the implementation of unslotted carrier sensing techniques in LoRaWAN. It was concluded that, while the ALOHA like LoRaWAN can perform effectively under light load conditions, the throughput and probability of success of the CSMA protocols was better as the number of serviced devices per gateway increased. The average energy efficiency of the devices was observed to be better than the ALOHA in higher traffic loads.
Embedded Systems
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: LoRa; LoRaWAN; CSMA; CAD
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APA (6th Edition):
Tawde, G. (. (2018). Scalability in LoRaWAN. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1d4d4125-52fd-4304-a7ba-c28244af8a59
Chicago Manual of Style (16th Edition):
Tawde, Gauri (author). “Scalability in LoRaWAN.” 2018. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:1d4d4125-52fd-4304-a7ba-c28244af8a59.
MLA Handbook (7th Edition):
Tawde, Gauri (author). “Scalability in LoRaWAN.” 2018. Web. 05 Mar 2021.
Vancouver:
Tawde G(. Scalability in LoRaWAN. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:1d4d4125-52fd-4304-a7ba-c28244af8a59.
Council of Science Editors:
Tawde G(. Scalability in LoRaWAN. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:1d4d4125-52fd-4304-a7ba-c28244af8a59
Delft University of Technology
4.
Manjappa, Renukaprasad (author).
Crowd Distribution Estimation using Smart Lighting Grids.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:df6b4b54-5f39-4be9-8956-efacd6cb6fbf
► Estimating the number of people in a given area and knowing their positions open up numerous possibilities for a variety of smart data driven applications.…
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▼ Estimating the number of people in a given area and knowing their positions open up numerous possibilities for a variety of smart data driven applications. Most of the existing systems either require active participation from people in the crowd or are too expensive to be deployed. The exponentially increasing adoption of smartphones by people and the ubiquitous Wi-Fi infrastructure motivated us to tackle this problem in a non-intrusive manner. This thesis focuses on designing a system to infer the crowd distribution in large indoor spaces. As we choose to be non-intrusive in approach, we incorporate low cost Wi-Fi sniffers into smart bulbs that are part of the lighting grids in buildings. The Wi-Fi data gathered from these smart bulbs is analyzed to obtain people count and the people’s position within a given area. Our aim is to estimate people’s location within 4x4 m2 grids with minimal number of Wi-Fi frames. A number of filtering and post processing mechanisms are proposed in order to eliminate false positives and to accurately identify the number of people within a given area. Extensive experiments are conducted in a realworld testbed with controlled settings as well as in test setups with no control (auditorium and a coffee corner). The improvised counting algorithm comes close to 75% of the ground truth. We adopt range free localization algorithms to estimate the position of people and evaluate these algorithms extensively. We propose enhancements on these algorithms to refine the position estimation accuracy and reduce the execution time. Range free localization algorithms were able to estimate the position 40% of the time within 2m when sniffers are placed 6m apart in a grid topology in a highly multipath testbed environment. Simulations indicate this number can increase up to 76% when sniffers are placed 4m for the same topology. Since the bulbs with sniffers cost more we minimize the overall deployment cost of the system by reducing the number of sniffers while maintaining an accuracy within a 4x4 m2 grid majority of the time. Extensive simulations are run with different topologies and sniffer densities in order to find this sweet spot. iv
Advisors/Committee Members: Rao, Vijay (mentor), Venkatesha Prasad, Ranga Rao (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: smart lighting grids
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APA (6th Edition):
Manjappa, R. (. (2017). Crowd Distribution Estimation using Smart Lighting Grids. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:df6b4b54-5f39-4be9-8956-efacd6cb6fbf
Chicago Manual of Style (16th Edition):
Manjappa, Renukaprasad (author). “Crowd Distribution Estimation using Smart Lighting Grids.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:df6b4b54-5f39-4be9-8956-efacd6cb6fbf.
MLA Handbook (7th Edition):
Manjappa, Renukaprasad (author). “Crowd Distribution Estimation using Smart Lighting Grids.” 2017. Web. 05 Mar 2021.
Vancouver:
Manjappa R(. Crowd Distribution Estimation using Smart Lighting Grids. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:df6b4b54-5f39-4be9-8956-efacd6cb6fbf.
Council of Science Editors:
Manjappa R(. Crowd Distribution Estimation using Smart Lighting Grids. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:df6b4b54-5f39-4be9-8956-efacd6cb6fbf
Delft University of Technology
5.
Fragkeskos, Kyriakos (author).
Semantic enrichment and exploration process on domain specific digital libraries.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:4475a83f-d0e8-485a-ba74-5478f43c32aa
► With the growing number of scientific publications, the concept of navigating effectively and searching for domain specific information is rather significant and highly important for…
(more)
▼ With the growing number of scientific publications, the concept of navigating effectively and searching for domain specific information is rather significant and highly important for the scientific community [2]. For instance, to search by topics, research methods, used datasets, or scientific objectives. Such deep meta-data increase our perception for a given domain (i.e. Data Processing Pipelines) and facilitate us to understand and visualize the evolution of research topics and venues over time. Nevertheless, the extraction of such deep meta-data from text-based documents is notorious challenging and demanding due to the unstructured and ambiguous language of the text in different publications. The work in this paper has already contributed into two publication attempts; with one published paper at ESWC conference, and one accepted paper at the TPDL conference. Furthermore, the work in this project extends the analysis of previous attempts by adding more data from the domain of Data Processing Pipelines and by including one additional domain for analysis (i.e. the domain of Robotics). Moreover, this work provides justifications for all the implementation decisions and proposes a refined version of the online domain-aware semantic enrichment framework (SmartPub), that automates the generation of deep meta-data by utilizing key facets from the domains of Data Processing Pipelines and Robotics. The goal is to generate structured meta-data (i.e. named entities or phrases), from full-text scientific publications, with respect to a set of domain aware facets (i.e. Objective, Methods, Dataset, Software, and Results), and afterwards, to construct groups of facet-terms (i.e. facet-topics) according to their semantic similarity for allowing data exploration and navigation. Finally, the proposed framework is evaluated both quantitatively and qualitatively on seventeen conference series from the domains of Data Processing Pipelines and Robotics.
Advisors/Committee Members: Lofi, Christoph (mentor), Houben, Geert-Jan (graduation committee), Venkatesha Prasad, Ranga Rao (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Meta-Data Extraction; Digital Library; Facet Embedding; Natural Language Processing; Topic Modeling
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APA (6th Edition):
Fragkeskos, K. (. (2017). Semantic enrichment and exploration process on domain specific digital libraries. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:4475a83f-d0e8-485a-ba74-5478f43c32aa
Chicago Manual of Style (16th Edition):
Fragkeskos, Kyriakos (author). “Semantic enrichment and exploration process on domain specific digital libraries.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:4475a83f-d0e8-485a-ba74-5478f43c32aa.
MLA Handbook (7th Edition):
Fragkeskos, Kyriakos (author). “Semantic enrichment and exploration process on domain specific digital libraries.” 2017. Web. 05 Mar 2021.
Vancouver:
Fragkeskos K(. Semantic enrichment and exploration process on domain specific digital libraries. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:4475a83f-d0e8-485a-ba74-5478f43c32aa.
Council of Science Editors:
Fragkeskos K(. Semantic enrichment and exploration process on domain specific digital libraries. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:4475a83f-d0e8-485a-ba74-5478f43c32aa
Delft University of Technology
6.
Shah, Dhaval (author).
A Day in a Wheelchair.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:e6cce86f-73f2-419b-bb88-1b4369f988d7
► Advances in sensing and machine learning technologies give rise to personal health coaches that monitor human activities and support healthy behaviour. In this context, wheelchair…
(more)
▼ Advances in sensing and machine learning technologies give rise to personal health coaches that monitor human activities and support healthy behaviour. In this context, wheelchair users can benefit from such technologies as they often suffer from physical ailments due to insufficient or over activity, prolonged improper posture and lack of postural changes. While sitting posture is a well-studied area, current works focus on the recognition of less frequent postures and miss important postures such as slouching and pelvic postures. The benefits gained from activity tracking also remain restricted to able bodied individuals. In this thesis we demonstrate an end-to-end, multimodal, wheelchair sitting posture and activity monitoring system facilitating just-in-time feedback on postural changes. By using an earable to monitor activity and head posture with a complementary filter and performing classification using Force Sensitive Resistors, we show faster and more precise recognition of relevant postures and activity.
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Kortuem, Gerd (graduation committee), Bourgeois, Jacky (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: wheelchair; earable; sensor fusion; wearable; posture; classification; activity tracker
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APA (6th Edition):
Shah, D. (. (2019). A Day in a Wheelchair. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e6cce86f-73f2-419b-bb88-1b4369f988d7
Chicago Manual of Style (16th Edition):
Shah, Dhaval (author). “A Day in a Wheelchair.” 2019. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:e6cce86f-73f2-419b-bb88-1b4369f988d7.
MLA Handbook (7th Edition):
Shah, Dhaval (author). “A Day in a Wheelchair.” 2019. Web. 05 Mar 2021.
Vancouver:
Shah D(. A Day in a Wheelchair. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:e6cce86f-73f2-419b-bb88-1b4369f988d7.
Council of Science Editors:
Shah D(. A Day in a Wheelchair. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:e6cce86f-73f2-419b-bb88-1b4369f988d7
Delft University of Technology
7.
Pandaravila Biju, Atul (author).
An Energy-Harvesting Facade Optimization System for Built Environments.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d06f954a-51e6-4423-88d9-61b2da3276c2
► Daylighting is the immediate exploitation of solar energy in the form of nat- ural lighting and plays an integral role in minimizing the energy footprint…
(more)
▼ Daylighting is the immediate exploitation of solar energy in the form of nat- ural lighting and plays an integral role in minimizing the energy footprint of a building. Smart daylighting enables us to design buildings that provide comfort and energy savings. This work proposes a dynamic facade system for buildings which aims to maximize user comfort while simultaneously maximizing energy savings by harvesting solar energy optimally. The solar panels on the facade can har- vest the highest amount of energy when it is positioned perpendicular to the suns rays. However, this may result in unsatisfactory lighting conditions in- side the room and the problem is approached as a bi-objective optimization problem. This work is a preliminary exploration of the concept of smart skins for buildings that autonomously regulates light while harvesting solar energy, contributing to the creation of the future of sustainable buildings. The primary focus of this research work revolves around building a con- ceptual model, formulating an optimization problem, developing a control algorithm, iFOS, and then evaluating it. Data was simulated using advanced simulations to evaluate the dynamics of light indoors. Two benchmarks were created to evaluate the algorithm against, one where the system works towards maximizing user comfort indoors, and the other, where the system works to maximize the energy harvested by the facade. Upto 8% increase in the energy harvested was achieved with minimal loss in user comfort in the use case evaluated. The average energy figure for The Netherlands in the summer months is about 5 kWh/m2/day, which makes the total energy that can be captured at 20% efficiency to be about 750 kWh per day. The algorithm is found to work the best when the desired light level to be maintained indoors lies in the range [400,600] lux.
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Sarkar, Chayan (mentor), Langendoen, Koen (graduation committee), Eisemann, Elmar (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Facade; Building envelope; Solar Energy; Simulation; Sustainability
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APA (6th Edition):
Pandaravila Biju, A. (. (2017). An Energy-Harvesting Facade Optimization System for Built Environments. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d06f954a-51e6-4423-88d9-61b2da3276c2
Chicago Manual of Style (16th Edition):
Pandaravila Biju, Atul (author). “An Energy-Harvesting Facade Optimization System for Built Environments.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:d06f954a-51e6-4423-88d9-61b2da3276c2.
MLA Handbook (7th Edition):
Pandaravila Biju, Atul (author). “An Energy-Harvesting Facade Optimization System for Built Environments.” 2017. Web. 05 Mar 2021.
Vancouver:
Pandaravila Biju A(. An Energy-Harvesting Facade Optimization System for Built Environments. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:d06f954a-51e6-4423-88d9-61b2da3276c2.
Council of Science Editors:
Pandaravila Biju A(. An Energy-Harvesting Facade Optimization System for Built Environments. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:d06f954a-51e6-4423-88d9-61b2da3276c2
Delft University of Technology
8.
Soto Muñoz Ledo, Sergio (author).
Telehealth and Remote Monitoring of the Elderly: A Generic IoT Approach.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:ec8c380d-1c87-4d8d-b228-0fb8eaed28c4
► As the elderly world population increases, caregivers are switching to remote care and monitoring solutions to enable their patients to live autonomously at home for…
(more)
▼ As the elderly world population increases, caregivers are switching to remote care and monitoring solutions to enable their patients to live autonomously at home for as long as possible. Such services are based on detecting and recognizing Activities of Daily Living (ADL) by using diverse types of sensors at the elder's home that transmit activity data to a remote backend for processing. However, these have a limited reach due to high costs, mostly due to elevated prices of the hardware required, as well as the installation costs. Meanwhile, Smart Home technologies are reaching more homes every year. These are based on identical sets of sensors as those prescribed for remote health monitoring systems. Extensive research has taken place in recognizing ADL given the sensor signals. However, these methodologies require prescribed sensors, the floor plan of the house and the location of the sensors. In this thesis, we first propose a generic IoT interface that enables the backend to connect to arbitrary sensors, such as those typically found in Smart Homes. Regardless of the brand and communication protocol they use, the sensor data is transmitted to a backend where it can be processed by the ADL recognition algorithms and other telemonitoring services. We evaluate our design in the Philips HomeLab environment where generic sensors are installed. The system correctly transmits the activity detected by the sensors to a remote cloud service. Then, we propose a methodology based on Multidimensional Scaling to estimate the location and distribution of sensors based entirely on monitored sensor activity. Finally, we propose a methodology combining heuristics and Support Vector Machines to classify and label the sensors by the type of room in which they are placed, such as Kitchen, Bedroom or Bathroom. We train and test our model based on 4 different houses where volunteers had sensors monitoring their activity for at least 80 days. Our proposed methodology correctly identifies 5 different key locations and fully characterizes the interior of the house. Our heuristic classifier achieves a sensitivity of 0.84 and specificity of 0.98. The SVM classifier achieves a precision of 0.78 and recall of 0.78. This results in an automated method of generating the configuration data needed by the fore mentioned ADL recognition algorithms. The experiment demonstrates the feasibility of using the IoT paradigm for remote health monitoring systems by reusing existing sensors found in smart homes, reducing burden and costs which can potentially have an impact on a broader adoption of these kind of monitoring services.
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Kouvelas, Nikos (mentor), Spaan, Matthijs (graduation committee), ten Kate, Warner (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: IoT; Sensors; Telehealth; Remote Sensing; Multi-Dimensional Scaling; SVM; Machine Learning
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APA (6th Edition):
Soto Muñoz Ledo, S. (. (2018). Telehealth and Remote Monitoring of the Elderly: A Generic IoT Approach. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:ec8c380d-1c87-4d8d-b228-0fb8eaed28c4
Chicago Manual of Style (16th Edition):
Soto Muñoz Ledo, Sergio (author). “Telehealth and Remote Monitoring of the Elderly: A Generic IoT Approach.” 2018. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:ec8c380d-1c87-4d8d-b228-0fb8eaed28c4.
MLA Handbook (7th Edition):
Soto Muñoz Ledo, Sergio (author). “Telehealth and Remote Monitoring of the Elderly: A Generic IoT Approach.” 2018. Web. 05 Mar 2021.
Vancouver:
Soto Muñoz Ledo S(. Telehealth and Remote Monitoring of the Elderly: A Generic IoT Approach. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:ec8c380d-1c87-4d8d-b228-0fb8eaed28c4.
Council of Science Editors:
Soto Muñoz Ledo S(. Telehealth and Remote Monitoring of the Elderly: A Generic IoT Approach. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:ec8c380d-1c87-4d8d-b228-0fb8eaed28c4
Delft University of Technology
9.
Shruthi Kashyap, Shruthi (author).
Adapting TCP/IP protocol to a Time-Slotted NFC Channel present in a Wireless Power Environment.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:39c662a8-b085-4115-acd7-7aa45dfd7c13
► Kitchen is becoming a hotbed for innovation in the Internet of Things (IoT) revolution. Many kitchen appliances are being connected to the Internet to facilitate…
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▼ Kitchen is becoming a hotbed for innovation in the Internet of Things (IoT) revolution. Many kitchen appliances are being connected to the Internet to facilitate `smart-cooking'. The appliances are becoming cordless too, i.e., they are being powered by the inductive power sources which are integrated into the kitchen counter-tops. The Wireless Power Consortium (WPC) has proposed standards for smart-cooking in cordless kitchens by enabling communication using the near field communication (NFC) protocol between the appliance and the power transmitter. In order to keep the appliances safe as well as reduce the cost of the appliances, it is required that the NFC channel should be exploited to enable Internet connectivity in the appliances. However, due to practical constraints, the NFC channel is time-slotted. Furthermore, this NFC channel has low data rates and high latencies. These constraints make it highly challenging to enable Internet connectivity for these resource-constrained cooking appliances for IoT applications. This thesis explores different ways of providing Internet connectivity to the cordless kitchen appliances using the time-slotted NFC channel. Two architectures are proposed based on this method, namely the Proxy and the Bridge architectures. In the proxy architecture, the cordless appliances implement only the application layer and tunnel the application data through the NFC channel which will then be used by the power source to create TCP/IP packets for the appliance. In the bridge architecture, the appliances implement all the layers of the TCP/IP network stack. All the TCP/IP traffic is sent through the NFC channel and the power source acts as an intermediate hop. These architectures are evaluated in detail to determine the best-suited architecture. The thesis concludes that the bridge architecture, although heavy on the appliances, truly creates an IoT-enabled appliance, and therefore adopts it. While it is proposed to send the complete TCP/IP packets to go over the NFC channel, the impact on the performance of the protocols needs to be investigated, specifically the TCP as it is the most used protocol for IoT applications. The performance of the TCP will be affected due to several reasons: (a) the time-slotted NFC channel; (b) low data rates on the NFC; (c) delays in accessing the NFC channel, and (d) no control over the network stack of the other TCP end-point. Furthermore, the behavior of the TCP in such resource-constrained channels aggravate the problems as spurious retransmissions get triggered. This work presents important challenges that need to be solved in order to enable the TCP to work smoothly in the time-slotted NFC channels. Two major performance problems that occur in such an environment are identified, viz., spurious retransmissions and packet drops at the NFC interface. The existence of the problems are verified with an experimental setup of the cordless kitchen and solutions are presented to these challenges: (a) determine the optimal retransmission timeout…
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Rao, Vijay (graduation committee), Staring, Toine (graduation committee), Hauff, Claudia (graduation committee), Langendoen, Koen (graduation committee), Delft University of Technology (degree granting institution).
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APA ·
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MLA ·
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APA (6th Edition):
Shruthi Kashyap, S. (. (2017). Adapting TCP/IP protocol to a Time-Slotted NFC Channel present in a Wireless Power Environment. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:39c662a8-b085-4115-acd7-7aa45dfd7c13
Chicago Manual of Style (16th Edition):
Shruthi Kashyap, Shruthi (author). “Adapting TCP/IP protocol to a Time-Slotted NFC Channel present in a Wireless Power Environment.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:39c662a8-b085-4115-acd7-7aa45dfd7c13.
MLA Handbook (7th Edition):
Shruthi Kashyap, Shruthi (author). “Adapting TCP/IP protocol to a Time-Slotted NFC Channel present in a Wireless Power Environment.” 2017. Web. 05 Mar 2021.
Vancouver:
Shruthi Kashyap S(. Adapting TCP/IP protocol to a Time-Slotted NFC Channel present in a Wireless Power Environment. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:39c662a8-b085-4115-acd7-7aa45dfd7c13.
Council of Science Editors:
Shruthi Kashyap S(. Adapting TCP/IP protocol to a Time-Slotted NFC Channel present in a Wireless Power Environment. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:39c662a8-b085-4115-acd7-7aa45dfd7c13
Delft University of Technology
10.
Humala, Bontor (author).
Semi-supervised Energy Disaggregation Framework using General Appliance Models.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:6d60dba9-5817-4787-a799-bc7a2188146e
► Providing detailed appliance-level energy consumption information helps consumers to understand their usage behavior and encourages them to optimize their energy usage. Non-intrusive load monitoring (NILM)…
(more)
▼ Providing detailed appliance-level energy consumption information helps consumers to understand their usage behavior and encourages them to optimize their energy usage. Non-intrusive load monitoring (NILM) or energy disaggregation aims to estimate appliance-level energy consumption data from the aggregate consumption data of households. NILM algorithms can be broadly classified into supervised and unsupervised (or semi-supervised) techniques. The former requires a large amount of prior data for each appliance and the latter relies on manual tuning of models of appliances based on some metadata information. While there is a significant interest from academia and industry, NILM techniques are still not adopted widely across households. This is mainly because the techniques developed for one household cannot be generalized and applied in other households (applicability), require tremendous manual-tuning to apply across households (scalability), and cannot run in real-time. To overcome the above issues, we propose a novel semi-supervised energy disaggregation framework – UniversalNILM. The key idea of UniversalNILM is to model appliances in a few (3-10) training houses, which has detailed appliance-level data and transfer this learning to test houses (blind disaggregation), which has only aggregate house consumption data to derive fine-grained appliance energy consumption. To this end, we develop an automated appliance modeling technique that creates general appliance models across various appliance brands and models. The general appliance models are analytical models which describe power consumption of each appliance. These general appliance models are then fine-tuned automatically on test houses to accurately disaggregate the energy consumption in real-time. To test the robustness of UniversalNILM, we empirically evaluated it across three publicly available real-world datasets. We show that the general appliance models learnt on a few households is able to accurately disaggregate on unseen test houses in the same dataset, as well as unseen houses from different datasets. This is the first work in NILM which is able to perform disaggregation across datasets. Another improvement is that UniversalNILM outperforms the reported accuracy from both state-of-the-art supervised and unsupervised NILM techniques.
Embedded Systems
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Akshay Uttama, Nambi S.N. (mentor), Langendoen, Koen (graduation committee), Bozzon, Alessandro (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: NILM; Machine Learning; disaggregation; Energy efficient technologies
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Humala, B. (. (2018). Semi-supervised Energy Disaggregation Framework using General Appliance Models. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:6d60dba9-5817-4787-a799-bc7a2188146e
Chicago Manual of Style (16th Edition):
Humala, Bontor (author). “Semi-supervised Energy Disaggregation Framework using General Appliance Models.” 2018. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:6d60dba9-5817-4787-a799-bc7a2188146e.
MLA Handbook (7th Edition):
Humala, Bontor (author). “Semi-supervised Energy Disaggregation Framework using General Appliance Models.” 2018. Web. 05 Mar 2021.
Vancouver:
Humala B(. Semi-supervised Energy Disaggregation Framework using General Appliance Models. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:6d60dba9-5817-4787-a799-bc7a2188146e.
Council of Science Editors:
Humala B(. Semi-supervised Energy Disaggregation Framework using General Appliance Models. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:6d60dba9-5817-4787-a799-bc7a2188146e
Delft University of Technology
11.
van der Veen, Niels (author).
A paint-based approach for optimal lighting design in real scenes.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:87f5e0a0-54b9-486d-9d40-59f7864b6d0e
► Lighting design is a computational expensive task, commonly done using Computer-aided design (CAD) software in a virtual scene. The designer places and tunes the virtual…
(more)
▼ Lighting design is a computational expensive task, commonly done using Computer-aided design (CAD) software in a virtual scene. The designer places and tunes the virtual light sources and, yet the virtual environment is ideal for physically correct light tracing, the costly simulation might not provide the desired impression in the real scene. Moreover, the chosen light placement is not necessarily optimized. In this work we capture light behavior from real scenes as well as 3D scene properties and use this information to recreate different lighting designs. The results approximates physical correctness while visualizing the illumination on the real scene in a more time-efficient way. To make the design process more intuitive, the user paints the desired light properties instead of placing the light sources. The system attempts to find valid positions and parameters of the light sources in the scene to reflect the current design. Constraints such as number of light sources and emission profiles as well as spatial constraints can be specified.
Embedded Systems
Advisors/Committee Members: Eisemann, Elmar (mentor), Hildebrandt, Klaus (graduation committee), Venkatesha Prasad, Ranga Rao (graduation committee), Ziliotto Salamon, Nestor (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Lighting design; Image based lighting; Genetic Algorithm; Light probe; Paint based
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APA ·
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APA (6th Edition):
van der Veen, N. (. (2018). A paint-based approach for optimal lighting design in real scenes. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:87f5e0a0-54b9-486d-9d40-59f7864b6d0e
Chicago Manual of Style (16th Edition):
van der Veen, Niels (author). “A paint-based approach for optimal lighting design in real scenes.” 2018. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:87f5e0a0-54b9-486d-9d40-59f7864b6d0e.
MLA Handbook (7th Edition):
van der Veen, Niels (author). “A paint-based approach for optimal lighting design in real scenes.” 2018. Web. 05 Mar 2021.
Vancouver:
van der Veen N(. A paint-based approach for optimal lighting design in real scenes. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:87f5e0a0-54b9-486d-9d40-59f7864b6d0e.
Council of Science Editors:
van der Veen N(. A paint-based approach for optimal lighting design in real scenes. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:87f5e0a0-54b9-486d-9d40-59f7864b6d0e
Delft University of Technology
12.
Haridas, Anand (author).
Extending the lifetime of NB-IoT devices through Energy-Harvesting techniques.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:596af01f-adef-428d-b802-730a1ff11e4f
► For the Internet of Things (IoT) applications that send a few bytes of sensor information infrequently, several long-range IoT technologies have been conceived. Narrowband IoT…
(more)
▼ For the Internet of Things (IoT) applications that send a few bytes of sensor information infrequently, several long-range IoT technologies have been conceived. Narrowband IoT (NB-IoT) is one of them that stands out due to its extended coverage, high penetrability, and high reliability features. Envisaged long device lifetime and the extended coverage are important aspects of the NB-IoT radio technology that has garnered attention. With the increase in applications to connect a large number of devices over long distances, it becomes crucial for the technology to meet the lifetime expectations set in the standards. However, the empirical lifetime estimations, done as part of this work, indicate that the current devices do notmeet the lifetime estimates targeted in the 3GPP standards, lasting for 2.38 yearswhen exchanging 200 bytes of data at a rate of 1 message per day. Potential solutions include energy-harvesting to augment the battery lifetime. However, due to the spatiotemporal variation in the amount of energy harvested, the supplemented energy levels will be less than the energy consumption. Therefore, it becomes essential for the sensor device enabled with NB-IoT communication technology to implement energy management techniques to maximize the utility to the application it serves based on its energy situation. Further, the coverage enhancement techniques inbuilt in the technology forms a major contributor to the low device lifetime. With the NB-IoT radio block considered as a ‘black box’ with no access to the software stack, innovative solutions are required to reduce the energy consumption of sending payloads without losing out on coverage. To this end, this work proposes a framework called xTEND to increase the utility of the device while being energy-efficient in deep coverage scenarios. In xTEND, the decision to transmit a payload is done by modeling the problem as a 0/1 incremental knapsack problem. A threshold policy is proposed that optimally schedules payloads in a given finite horizon, with a low complexity method to compute it on the device. Furthermore, as the coverage enhancement techniques deplete the battery soon for deep coverage scenarios, we propose to increase the transmission power adaptively based on the channel conditions. The framework is evaluated with an existing scheme in the literature that performs energy management and is shown to outperform in different traffic distributions. Further, with the framework, an average 3.8 J of energy savings and 8.027 s of time savings is obtained in the shared and control channels of the physical layer. This results in an average lifetime extension of 20 % in deep coverage scenarios. With the only requirement of access to the power amplifier embedded on the NB-IoT chipset, the framework can be implemented on the deployed sensor device.
Embedded Systems
Advisors/Committee Members: Venkatesha Prasad, Ranga Rao (mentor), Rao, Vijay (mentor), Kuipers, Fernando (graduation committee), de Weerdt, Mathijs (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: NB-IoT; energy-harvesting; lifetime extension; Energy characterization
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APA ·
Chicago ·
MLA ·
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Export
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Manager
APA (6th Edition):
Haridas, A. (. (2018). Extending the lifetime of NB-IoT devices through Energy-Harvesting techniques. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:596af01f-adef-428d-b802-730a1ff11e4f
Chicago Manual of Style (16th Edition):
Haridas, Anand (author). “Extending the lifetime of NB-IoT devices through Energy-Harvesting techniques.” 2018. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:596af01f-adef-428d-b802-730a1ff11e4f.
MLA Handbook (7th Edition):
Haridas, Anand (author). “Extending the lifetime of NB-IoT devices through Energy-Harvesting techniques.” 2018. Web. 05 Mar 2021.
Vancouver:
Haridas A(. Extending the lifetime of NB-IoT devices through Energy-Harvesting techniques. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:596af01f-adef-428d-b802-730a1ff11e4f.
Council of Science Editors:
Haridas A(. Extending the lifetime of NB-IoT devices through Energy-Harvesting techniques. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:596af01f-adef-428d-b802-730a1ff11e4f
. 
Open Access Theses and Dissertations