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Articles 331 - 336 of 336
Full-Text Articles in Electrical and Computer Engineering
Optical Amplifiers For 10 Gb/S Wdm Recirculating Loop Testbed, Sravanthi Thotakura
Optical Amplifiers For 10 Gb/S Wdm Recirculating Loop Testbed, Sravanthi Thotakura
Electrical Engineering Theses - Archive
This Master's thesis deals with building experimental setup for characterization of novel nonlinear optical devices for fiber communication. The first part of the thesis deals with the description of the theoretical basis for operation of a particular type of such nonlinear optical devices, namely a parametric amplifier. Document includes deriving and solving the equations for parametric amplification in optical fiber when signal, idler and pump beams are linearly co-polarized. We consider both non-degenerate and degenerate pump cases for arbitrary phase mismatch. In the second part of the thesis we present the design and experimental implementation of electrical interface between commercial …
Time Synchronization In Network-Centric Sensor Networks, Sejal D. Raje
Time Synchronization In Network-Centric Sensor Networks, Sejal D. Raje
Electrical Engineering Theses - Archive
Time synchronization is a crucial component of infrastructure for wireless sensor networks (WSN). Most applications of WSNs make extensive use of time synchronization, for accurate timestamping of events, coordinate activities of the network, data fusion, object tracking or TDMA scheduling. The unique requirements of sensor networks in terms of precision, lifetime, energy and scope of the synchronization achieved, calls for design of new synchronization methods for WSNs. In this thesis, we describe the design of three novel techniques for achieving synchronization in network centric scenario of sensor networks: sequential least squares, Kalman filter and fuzzy logic systems. The strength of …
Collision Response For Virtual Laparoscopic Surgery, Jitesh Devidas Butala
Collision Response For Virtual Laparoscopic Surgery, Jitesh Devidas Butala
Electrical Engineering Theses - Archive
During laparoscopic surgery the surgeon operates inside the abdomen guided by the 2D imagery of the operating area. This image is obtained via a camera inserted through a small incision. Laparoscopic surgery, in contrast to open surgery, results in low pain and recovery time for the patient. However, the surgeons have some difficulty, as the training required for this type of surgery is more intense and rigorous than that for conventional open surgery. Hence, surgical trainers for laparoscopic surgery are important. The main difference in the different types of surgical trainers is the degree to which the actual environment of …
Structure & Decision In Mobile Wireless Sensor Networks, Prasanna Mohan Ballal
Structure & Decision In Mobile Wireless Sensor Networks, Prasanna Mohan Ballal
Electrical Engineering Theses - Archive
This work concerns the development of a novel structure of Discrete Event Controller (DEC) for mobile wireless sensor networks consisting of mobile robots and stationary wireless sensing nodes known as Unattended Ground Sensors (UGS). These are the three contributions: 1. Decision-making systems such as Fuzzy Logic and Dempster Shafer Theory for sensor fusion are implemented. 2. Decision-making is used for a special case of routing of resources for multiple tasks performed by different resources. 3. The DEC was actually implemented in the Mobile Wireless Sensor Networks lab at Automation & Robotics Research Institute. This work was supported by ARO grant …
Shared Data Acquisition System For Real-Time Power Systems Applications, Yi-Fang Hsu
Shared Data Acquisition System For Real-Time Power Systems Applications, Yi-Fang Hsu
Electrical Engineering Theses - Archive
Digital signal processing chip (DSP's) can be used to perform data analysis computation and have very good performance in real-time system. Digital filters can be designed with consideration of both magnitude and phase responses for digital re-sampling in power system applications. The design consists of two parts: magnitude approximation and group delay compensation. It compromises between the amount of calculation needed to implement the filters and the performance of the filters, which makes the filters good candidates for both real-time and offline applications.
Analysis And Modeling Of A Micro Variable Capacitance Electromechanical Energy Converter, Amita Jindal
Analysis And Modeling Of A Micro Variable Capacitance Electromechanical Energy Converter, Amita Jindal
Electrical Engineering Theses - Archive
Research and development in microelectromechanical systems (MEMS) have made remarkable progress since 1988. Micro-machines are an integral part of MEMS. However, these machines are not often discussed in most electric machines, power electronics and drive forums due to the relative newness of these machines. This thesis provides an in-depth analysis of a variable capacitance micro-machine (VCM). It gives an insight into the effects of machine geometry, on capacitance and torque profiles of the machine. Tangential and radial components of the electrostatic forces in the air gap of the machine have been investigated to study the effects of mutual flux. These …