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Articles 361 - 370 of 370
Full-Text Articles in Engineering
Mcmc- Based Optimization And Application, Xiaobin Wu
Mcmc- Based Optimization And Application, Xiaobin Wu
Electronic Theses and Dissertations
In the thesis, we study the theory of Markov Chain Monte Carlo (MCMC) and its application in statistical optimization. The MCMC method is a class of evolutionary algorithms for generating samples from given probability distributions. In the thesis, we first focus on the methods of slice sampling and simulated annealing. While slice sampling has a merit to generate samples based on the underlying distribution with adjustable step size, simulated annealing can facilitate samples to jump out of local optima and converge quickly to the global optimum. With this MCMC method, we then solve two practical optimization problems. The first problem …
Resource Allocation And Load-Shedding Policies Based On Markov Decision Processes For Renewable Energy Generation And Storage, Edwards Jimenez
Resource Allocation And Load-Shedding Policies Based On Markov Decision Processes For Renewable Energy Generation And Storage, Edwards Jimenez
Electronic Theses and Dissertations
In modern power systems, renewable energy has become an increasingly popular form of energy generation as a result of all the rules and regulations that are being implemented towards achieving clean energy worldwide. However, clean energy can have drawbacks in several forms. Wind energy, for example can introduce intermittency. In this thesis, we discuss a method to deal with this intermittency. In particular, by shedding some specific amount of load we can avoid a total system breakdown of the entire power plant. The load shedding method discussed in this thesis utilizes a Markov Decision Process with backward policy iteration. This …
Towards Improving Human-Robot Interaction For Social Robots, Saad Khan
Towards Improving Human-Robot Interaction For Social Robots, Saad Khan
Electronic Theses and Dissertations
Autonomous robots interacting with humans in a social setting must consider the social-cultural environment when pursuing their objectives. Thus the social robot must perceive and understand the social cultural environment in order to be able to explain and predict the actions of its human interaction partners. This dissertation contributes to the emerging field of human-robot interaction for social robots in the following ways: 1. We used the social calculus technique based on culture sanctioned social metrics (CSSMs) to quantify, analyze and predict the behavior of the robot, human soldiers and the public perception in the Market Patrol peacekeeping scenario. 2. …
Multifrequency Averaging Of Hysteresis-Current-Controlled Dc-Dc Converters, Yingying Liu
Multifrequency Averaging Of Hysteresis-Current-Controlled Dc-Dc Converters, Yingying Liu
Theses and Dissertations--Electrical and Computer Engineering
Multifrequency averaging is one of the widely used modeling and simulation techniques today for the analysis and design of power electronic systems. This technique is capable of providing the average behavior as well as the ripple behavior of power electronic systems. Hysteresis current control has fast response and internal current stability through controlling switches to maintain the current within a given hysteresis band of a given current command. However the state space variables in a hysteresis controlled system cannot be directly approached by multifrequency averaging method because of time varing switching frequency. In this thesis, a method of applying multifrequency …
Fault Section Identification For Power Distribution Systems Using Online Measurements, Jie Chen
Fault Section Identification For Power Distribution Systems Using Online Measurements, Jie Chen
Theses and Dissertations--Electrical and Computer Engineering
Fault location is very important for distribution systems, and quickly identifying the fault and restoring the system can help reduce the outage time and make the system more reliable. In this thesis, a method for locating faults on distribution systems is introduced to quickly identify the faulted feeder sections by using the overcurrent information from the switches in the system. Fuzzy logic is utilized. The proposed method can quickly and accurately locate faulted sections with different fault locations, fault types and fault resistances. The method is applicable to cases with single-faults or multi-faults, and is applicable to networks with multi-sources. …
Explorations For Efficient Reversible Barrel Shifters And Their Mappings In Qca Nanocomputing, Ke Chen
Explorations For Efficient Reversible Barrel Shifters And Their Mappings In Qca Nanocomputing, Ke Chen
Theses and Dissertations--Electrical and Computer Engineering
This thesis is based on promising computing paradigm of reversible logic which generates unique outputs out of the inputs and. Reversible logic circuits maintain one-to-one mapping inside of the inputs and the outputs. Compared to the traditional irreversible computation, reversible logic circuit has the advantage that it successfully avoids the information loss during computations. Also, reversible logic is useful to design ultra-low-power nanocomputing circuits, circuits for quantum computing, and the nanocircuits that are testable in nature. Reversible computing circuits require the ancilla inputs and the garbage outputs. Ancilla input is the constant input in reversible circuits. Garbage output is the …
Nanostructured Semiconductor Device Design In Solar Cells, Hongmei Dang
Nanostructured Semiconductor Device Design In Solar Cells, Hongmei Dang
Theses and Dissertations--Electrical and Computer Engineering
We demonstrate the use of embedded CdS nanowires in improving spectral transmission loss and the low mechanical and electrical robustness of planar CdS window layer and thus enhancing the quantum efficiency and the reliability of the CdS-CdTe solar cells. CdS nanowire window layer enables light transmission gain at 300nm-550nm. A nearly ideal spectral response of quantum efficiency at a wide spectrum range provides an evidence for improving light transmission in the window layer and enhancing absorption and carrier generation in absorber. Nanowire CdS/CdTe solar cells with Cu/graphite/silver paste as back contacts, on SnO2/ITO-soda lime glass substrates, yield the …
An Adaptive Physical- And Link Layer For Narrowband Mobile Ad-Hoc Networks, Mathias Dehm
An Adaptive Physical- And Link Layer For Narrowband Mobile Ad-Hoc Networks, Mathias Dehm
Theses
Search and Rescue (SAR) missions require robust ad-hoc networks especially in situations where existing wired or cellular networks have been damaged or are not available. Here, a promising SAR communications technology is a Mobile Ad-hoc Networks (MANETs). However, development of systems is challenging due to bandwidth constraints, various application services, high mobility and harsh environments leading to unstable wireless connections.
Throughout this thesis, a prototype of a physical- and link layer is developed which satisfies the criteria for communication services in SAR missions.
This work includes three major contributions:
The first contribution is a single-carrier narrowband physical layer. The transmission …
Limiters Protect Adcs Without Adding Harmonics, Chin-Leong Lim
Limiters Protect Adcs Without Adding Harmonics, Chin-Leong Lim
Chin-Leong Lim
High-speed Analogue to Digital Converters (ADC) are used for sampling at either the intermediate frequency (IF) or the radio frequency of wireless receivers. When the transmitter is nearby, the sampled signal can exceed the ADC’s maximum input level. So, amplitude limiting is necessary to prevent ADC damage or degradation. While automatic gain control is effective for controlling IF amplitude excursion in traditional single-carrier systems, it is not desirable in modern multi-carrier applications. One solution is to cap the IF amplitude excursion with a limiter. Unfortunately, a new problem is created – the strong non-linearity that is required of a good …
A Literature Survey On Different Type Of Energy Efficiently Routing Protocol In Wireless Sensor Network, Innovative Research Publications Irp India, Devendra Patle, Sandip Nemade
A Literature Survey On Different Type Of Energy Efficiently Routing Protocol In Wireless Sensor Network, Innovative Research Publications Irp India, Devendra Patle, Sandip Nemade
Innovative Research Publications IRP India
— Wireless sensor network is an emerging technology which has an immense scope of research and development. It has the potential of quick capturing, processing and transferring data with high resolution to the base station. WSN consists of multiple sensor nodes, these nodes have low storage capability and limited battery life which dies due to the computation and transmission of data. It is not feasible to replace these batteries due to their placement in isolated areas. In this paper we will emphasize on maximizing energy efficiency and improvement of life span of network. Clustering is the technique which balances the …