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Articles 241 - 270 of 336
Full-Text Articles in Electrical and Computer Engineering
Simulation Of Tetrahedral Mesh Based Organ Deformation Using Parameter Optimized Spring Constants, Koyel Mukherjee
Simulation Of Tetrahedral Mesh Based Organ Deformation Using Parameter Optimized Spring Constants, Koyel Mukherjee
Electrical Engineering Theses - Archive
Virtual reality based surgical simulators are becoming increasingly popular for training doctors on minimally invasive surgery. For these simulators, it is necessary to generate 3D organ models and create virtual environments depicting visually realistic deformation response by tissues and organs to manipulations by surgical tools. For creating a 3D model, several different approaches have been used by the computer graphics community, among which polygonal/polyhedral meshes have gained popularity for real time virtual reality applications. This work investigates two problems in 3D organ modeling for virtual reality simulators. Firstly, we consider the use of unstructured 3D meshes for generation of organ …
Implementation And Evaluation Of Residual Color Transform For 4:4:4 Rgb Lossless Coding, Pooja Vasant Agawane
Implementation And Evaluation Of Residual Color Transform For 4:4:4 Rgb Lossless Coding, Pooja Vasant Agawane
Electrical Engineering Theses - Archive
The 4:4:4 video sampling format promises an excellent quality video. It is gaining a lot of attention due to its significance in the professional applications of multimedia processing. The use of the RGB color space for video processing is attracting, both, the industry and the academia. Extensive research is being undertaken to achieve better compression efficiency and high coding gain in the RGB (red, green, blue) color space. In contrast to typical consumer applications, high quality video is demanded in areas such as professional digital video recording, video post production and digital cinema. These latter applications demand all three color …
Diagnosis And Prognosis Of Electrical And Mechanical Faults Using Wireless Sensor Networks And A Two-Stage Neural Network Classifier, Akarsha Ramani
Diagnosis And Prognosis Of Electrical And Mechanical Faults Using Wireless Sensor Networks And A Two-Stage Neural Network Classifier, Akarsha Ramani
Electrical Engineering Theses - Archive
Diagnosis and isolation of electrical and mechanical problems in induction motors has always been a very challenging task. Some of the common problems in induction motors are: bearing, stator winding, and rotor bar failures. This thesis has three phases: The first one pertains to development of low-cost test-beds for simulating bearing faults and short circuit stator winding faults in a motor. Bearing fault is due to the failure of any of the components of the bearing and the stator winding fault is due to the failure of insulation between the windings. Bearing faults can be identified from the motor vibration …
Theoretical And Experimental Study Of Wide-Band Quasi-Planar Conical Antennas, Tsungyin Wu
Theoretical And Experimental Study Of Wide-Band Quasi-Planar Conical Antennas, Tsungyin Wu
Electrical Engineering Theses - Archive
Conical antennas are widely used in many applications because of their broad input impedance bandwidth and omni-directional radiation pattern. However, conical antennas usually have three-dimensional structures and are, hence, relatively difficult to fabricate and integrate. In this thesis, a quasi-planar conical antenna is proposed, where the simulation and measurement results indicate that dielectric loading could mechanically stabilize the antenna while keeping the input impedance invariant within a broad band. Also, the proposed antenna keeps the original wide-band and omni-directional properties. Specifically, a few configurations of the quasi-planar conical antenna are simulated, fabricated, and tested. The simulation and measurement results show …
Hardware Platform For Research In Helicopter Uav Control, Petru Emanuel Stingu
Hardware Platform For Research In Helicopter Uav Control, Petru Emanuel Stingu
Electrical Engineering Theses - Archive
The topic discussed in this work addresses the current research being conducted at the Automation & Robotics Research Institute in the areas of UAV helicopter instrumentation targeted towards aerobatic flight control and heterogenous multi-vehicle cooperation. A modular electronic control system is designed which includes sensors communicating over a CAN bus and an on-board computer that runs a special real-time Linux kernel. The majority the electronics is developed by the author, including the electronic schematics, PCB design, component soldering and the supporting software. Commercially available modules are used for the radio transceivers or the on-board computer. The same control system is …
Image Mirroring, Rotation And Interpolation In The Wavelet Domain, Theju Isabelle Jacob
Image Mirroring, Rotation And Interpolation In The Wavelet Domain, Theju Isabelle Jacob
Electrical Engineering Theses - Archive
JPEG2000, the international standard for still image compression, uses the wavelet transform. The filters used in JPEG2000 for transformation are the 9/7 Daubechies filters and the 5/3 Le Gall filters. At present, to achieve image mirroring or rotation for images, one has to convert them back to spatial domain and proceed. This thesis presents methods by which it can be implemented in the wavelet domain, without extra computational complexity. To do so, one manipulates the transform domain coefficients so that the condition of perfect reconstruction still holds true. The thesis also discusses a method to achieve image interpolation, which would …
Performance Analysis And Effect Of Multi-User Interference For Ultra Wideband Communications, Mukta Athavale
Performance Analysis And Effect Of Multi-User Interference For Ultra Wideband Communications, Mukta Athavale
Electrical Engineering Theses - Archive
Ultra-Wideband (UWB) is an upcoming technology for short-range high data rate applications like Wireless Personal Area Networks or medium/long-range low data rate applications like sensor networks. UWB has many captivating characteristics such as very short duration pulses (order of nanoseconds), multipath channel, large instantaneous bandwidth and time hopping pulse trains resulting in coexistence with the existing narrow band users. The Ultra Wideband communication systems employ the technique of Impulse radio of transmitting short duration pulses which result in extremely wide bandwidth and many performance benefits. Since UWB systems operate in dense multipath environments, RAKE receiver is the optimum choice for …
Practical Evaluation And Analysis Of Passive Uhf Rfid Tags, Ananyaa Gautham
Practical Evaluation And Analysis Of Passive Uhf Rfid Tags, Ananyaa Gautham
Electrical Engineering Theses - Archive
In this thesis, we have identified the important parameters that impact the performance of passive UHF RFID tags and developed a testing methodology to evaluate and characterize tags. We have also developed the theory to validate the empirical data and analysis. The high performance, low cost and increased storage capacity of the RFID tags has led to the economic adoption of this technology by many industries. Choosing the right tag for the right application might be quite a task with the number of commercially available tags today. It is very important to test the tags and analyze the results to …
Improving The Bit Error Rate Performance Of Gsm System Using A Independent Component Analysis Based Non-Linear Filter, Kumarabhijeet Singh
Improving The Bit Error Rate Performance Of Gsm System Using A Independent Component Analysis Based Non-Linear Filter, Kumarabhijeet Singh
Electrical Engineering Theses - Archive
Presently, call drop out is considered a major problem in wireless communication. A large percentage of call drops take place due to network congestion, handover failure and high bit error rate.Our main objective is to reduce call drops due to high bit error rate using a newly proposed signal processing block (SPB) at the receiver section of a mobile handset. The SPB helps improve the performance of the wireless system, particularly Global Systems for Mobile (GSM) by providing a coding gain over the existing system. In this work, we carried out a simulation of the physical layer of a GSM …
Performance Evaluation Of Greedy Heuristic For Sip Analyzer In H.264/Svc, Jaydeep Vijay Inamdar
Performance Evaluation Of Greedy Heuristic For Sip Analyzer In H.264/Svc, Jaydeep Vijay Inamdar
Electrical Engineering Theses - Archive
The latest scalable video coding standard, H.264/SVC uses many components of H.264/AVC standard to maintain backward compatibility and also has proposed many tools to support scalable video coding with increased coding efficiency. SIP Analyzer is one such tool incorporated in JSVM (Joint Scalable Video Model) software which is the reference software for the SVC project. SIP Analyzer implements Selective Interlayer Prediction strategy to encode the bitstream so as to improve coding performance in scenarios where multiple adaptation is not needed without losing much if the same bitstream is used in scenario where multiple adaptation is needed. Core of this algorithm …
Fast Algorithms For Mdct And Low Delay Filterbanks Used In Audio Coding, Ravi Kiran Chivukula
Fast Algorithms For Mdct And Low Delay Filterbanks Used In Audio Coding, Ravi Kiran Chivukula
Electrical Engineering Theses - Archive
Modern audio and speech coding systems use filterbank and transform coding techniques to decorrelate the input signal. Cosine-modulated, perfect reconstruction, pseudo-QMF filterbanks are most commonly used for this purpose. In this thesis, we present three propositions. First, a fast algorithm for modified discrete cosine transform (MDCT) for transform lengths of the form 5× 2m and 15× 2m is presented. This algorithm is based on mapping the MDCT to DCT-II via DCT-IV and using the involutory property of the DCT-IV matrix. This leads to a reduction in the number of multiplications and constant memory requirement. The algorithm also uses very efficient …
On Reducing Call Drop Outs By Improving Bit Error Rate Performance In A Gsm Mobile Communications System, Sudeep Sharma
On Reducing Call Drop Outs By Improving Bit Error Rate Performance In A Gsm Mobile Communications System, Sudeep Sharma
Electrical Engineering Theses - Archive
Call Drop Out is one of the most annoying problems in Mobile Communications. It is one of the most important Quality of Service (QoS) indicators for a mobile carrier. Over the years, many strategies have been proposed to solve the problem of call drop out. But the problem is still prevalent. One of the important reasons for call drop outs is high Bit Error Rate (BER). In general, many existing wireless systems set a threshold BER before a call is dropped. In this work, our intent is to reduce the call drop out due to high BER. Towards that end, …
Simulation Analysis Of Orthogonal Frequency Division Multiplexing Systems With Diversity Reception, Sai Sravan Bharadwaj Karri
Simulation Analysis Of Orthogonal Frequency Division Multiplexing Systems With Diversity Reception, Sai Sravan Bharadwaj Karri
Electrical Engineering Theses - Archive
With the rapid increase in the utility of voice and data services, there is a demand for higher data rates and reliability in wireless communications. A wireless communication channel is prone to degrading effects such as multi-path fading, ISI etc. Orthogonal Frequency Division Multiplexing (OFDM), a candidate for the 4^{th} generation wireless systems, mitigates these effects and supports higher data rates.The performance analysis of a complex system like OFDM,is a challenging task where analytical methods become cumbersome to be used. Simulation based approaches provide a fair estimate of the performance in such cases. In this thesis, the performance of an …
Fano Resonance Filters On Patterned Silicon Photonic Crystal Nanomembranes, Santhad Chuwongin
Fano Resonance Filters On Patterned Silicon Photonic Crystal Nanomembranes, Santhad Chuwongin
Electrical Engineering Theses - Archive
Recently broadband reflectors and guided-resonance narrowband filters have been proposed to be the major components in communication and optical interconnect systems. Most work reported so far are based on free-standing membranes. Recent advances in the fabrication process have made it possible to pattern crystalline silicon nanomembranes (NMs) and transfer to foreign substrates. These NMs are transferable, stackable, bondable and manufacturable. In this thesis, we present two-dimensional photonic crystal broadband reflectors and narrowband filters based on Fano resonances on patterned silicon nanomembranes, on Si, glass, and polyethylene terephthalate (PET) substrates. For broadband reflectors, spectral trimming was achieved by partially or even …
Collision Response Of Surface Modeled Organs For Virtual Laparoscopic Surgery, Dibbesh Sharma Adhikari
Collision Response Of Surface Modeled Organs For Virtual Laparoscopic Surgery, Dibbesh Sharma Adhikari
Electrical Engineering Theses - Archive
Laparoscopic surgery is a modern surgical procedure in which, operations are performed in the abdomen by monitoring the image from a laparoscope: a telescopic rod lens system, which is usually connected to a video camera with a halogen or xenon light source, and is inserted into the abdomen through a small incision. Generally, laparoscopic surgeries are chosen over open surgery because of lower pain and speedier recovery process. However, the surgeon needs additional training in performing such surgery since laparoscopic camera reflects 2D mirror image of hand movement and depth information of the scene is harder for the surgeon to …
Collision Detection And Penetration Depth Calculation In Virtual Surgical Simulation, Rupin Pavithran
Collision Detection And Penetration Depth Calculation In Virtual Surgical Simulation, Rupin Pavithran
Electrical Engineering Theses - Archive
Virtual Reality (VR) based surgical simulators create a simulated, realistic three dimensional surgical environments using advanced graphic and haptic rendering techniques. Virtual objects, which are geometric surface polygonal models of different human organs and instruments, are rendered in a common viewing volume. Such deformable or non-deformable polygonal models interact with each other. In order to provide a realistic response in real-time, detection of collisions in such models is the greatest challenge in the field of VR based simulators. Once collision is detected, the overlapping region and the largest penetration distance for a pair of intersecting objects need to be determined …
The Design Of A Precision Current Miror Using A High-Gain Current Amplifier, Mei-Ping Pua
The Design Of A Precision Current Miror Using A High-Gain Current Amplifier, Mei-Ping Pua
Electrical Engineering Theses - Archive
An improved high gain, precision, low sensitivity current mirror is designed around a feedback circuit. This mirror utilizes a buffered Widlar current mirror to drive the constant input reference current, two beta helpers to compensate for the loss of base current and an active load, and a feedback loop in the amplifier. This design provides a comparison node for detecting the input error signal. The output collector current is substantially equal to the input reference current when driving multiple transistor loads. The circuit has been fabricated with National's VIP10 process, which caters to the high gain bipolar technology. Measurement results …
Development Of A New Procedure For Assessing Power System Reliability In Preparation For Nerc's Standards Compliance, Frederico Von Pinho
Development Of A New Procedure For Assessing Power System Reliability In Preparation For Nerc's Standards Compliance, Frederico Von Pinho
Electrical Engineering Theses - Archive
In response to historical reliability issues of the past and following the evolution of newly developing power system markets, NERC has created new standards for maintaining and enforcing power system reliability. Entities are still reviewing the standards and finding ways to comply with the same. Non-compliance can result in financial penalties that can add-up to $1M per day per violation.The aim of this thesis is to propose a procedure to be followed by entities wishing to comply with NERC's reliability requirements for a preliminary determination/understanding of the current reliability situation of the system and therefore foresee any difficulties might appear …
Evaluation Of Iso 18000-6 Type C Class 1 Generation 2 Rfid Protocol Artifacts, Nikhil Ayer
Evaluation Of Iso 18000-6 Type C Class 1 Generation 2 Rfid Protocol Artifacts, Nikhil Ayer
Electrical Engineering Theses - Archive
In this thesis, we have identified the effect on the performance of the RFID system when ISO 18000-6 Class 1 Gen 2 RFID protocol's parameters are changed. The protocol parameters we considered changing for the conformance testing are Tari, operating frequency, pulse width and modulation index at the constant transmitted power. The range of frequencies used in the experiments does fall outside the specification of ISO 18000-6 Type-C Class-1 Gen-2 protocol; but the power transmited by the RFID reader is under the FCC regulations. The research gives the detail behavior of the RFID signal propagation both from the reader to …
Combining The Wind Power Generation System With Energy Storage Equipments, Ming-Shun Lu
Combining The Wind Power Generation System With Energy Storage Equipments, Ming-Shun Lu
Electrical Engineering Theses - Archive
With the advance in wind turbine technologies, the cost of wind energy becomes competitive with other fuel-based generation resources. Due to the price hike of the fossil fuel and the concern of the global warming, the development of wind power has rapidly progressed over the last decade. The annual growth rate of the wind generation installation has exceeded 26% since 1990s. Many countries have set goal for high penetration levels of wind generations. Recently, several large-scale wind generation projects have been implemented all over the world. It is economically beneficial to integrate very large amounts of wind capacity in power …
Thermal Effects And Analysis On Analog Integrated Circuit Design, Ardasheir Sayek Rahman
Thermal Effects And Analysis On Analog Integrated Circuit Design, Ardasheir Sayek Rahman
Electrical Engineering Theses - Archive
Analog circuit design is an art of circuit designing. With technology becoming more advance and size of devices shrinking, circuit designing has becoming a real chance for the designers to meet up the demands in the market. Density of device transistor is rapidly increasing leading to thermal runaway issues and increasing operational speed of the transistors. Thus transistors are more sensitive to temperature changes, therefore requiring a more sensitive and accurate modeling of the thermal effects of the device as well as its adjacent devices. This research is on the thermal modeling of dielectric bipolar junction devices. It looks into …
Suppressing Delta-I Noise In Mcml Circuits In Mixed Signal Environment, Ritesh Jayant Mehta
Suppressing Delta-I Noise In Mcml Circuits In Mixed Signal Environment, Ritesh Jayant Mehta
Electrical Engineering Theses - Archive
This work addresses the problem of simultaneous switching noise (SSN) in mixed signal environment. It is shown that the Metal Oxide Semiconductor Current Mode Logic (MCML) can be used to minimize the SSN. In short channel devices, Drain Induced Barrier Lowering (DIBL) effect causes the current mismatch problem. It is seen that this current mismatch problem aggravates SSN. Basic logic gates were designed using MCML topology at 5 Gbps. Parasitic model was introduced at power supply lines and substrate to study the behaviour of these logic gates in the presence of parasitics. Interpolation type delay cells were used to suppress …
Localization In Noisy Environment Using Extended Kalman Filter, Aneeket Suresh Patkar
Localization In Noisy Environment Using Extended Kalman Filter, Aneeket Suresh Patkar
Electrical Engineering Theses - Archive
Localization is an important aspect of Wireless Sensor Networks. Information regarding the position of the sensor nodes is not always known. Without the position information of the sensors, the data reported by the sensors is of little use. Various approaches have been used to perform localization using some information about the sensor node. Potential field approach for localization, using distance information has been successfully tested with satisfactory results. However in case of noisy environment, the range measurements have greater inaccuracy. In such cases, localization using the above algorithm can provide some inaccuracy. To rectify such erroneous localization situations, Extended Kalman …
Decoupling Of Hamiltonian System With Applications To Linear Quadratic Problem, Vishal Gupta
Decoupling Of Hamiltonian System With Applications To Linear Quadratic Problem, Vishal Gupta
Electrical Engineering Theses - Archive
This thesis provides a method of decoupling the Hamiltonian system with application to linear quadratic problem in control system. Resulting decoupled Hamiltonian system helps in formulating easy closed form solution to various optimal control problems. These closed form solution are improvement over the problem of solving first order nonlinear differential equations in conventional methods. Decoupling also eliminates the constraint, "Q = 0 " for certain type of optimal control.
Sequences Of Bayes Gaussian Classifier, Jimy Shah
Sequences Of Bayes Gaussian Classifier, Jimy Shah
Electrical Engineering Theses - Archive
A new method for designing sequences of Bayes Gaussian Classifiers is presented in this thesis. First, a basic Bayes Gaussian Classifier is designed with an assumption of data being Gaussian. Then, we have used the Output Weight Optimization-Back Propagation (OWO-BP) technique to iteratively modify the coefficients of the classifier, resulting in less classification error. Through use of an iterative Gram-Schmidt procedure, to train linear functional link nets, input features are ordered from most useful to least useful. Another important development in this thesis is the generation of nested feature subsets. This ensures that the curve for error percentage versus the …
Embedded System For Monitoring Human Activities Using 3-Axis Accelerometer, Himabindu Yamana
Embedded System For Monitoring Human Activities Using 3-Axis Accelerometer, Himabindu Yamana
Electrical Engineering Theses - Archive
The last decade has witnessed a surge of interest in new sensing and monitoring devices for health care. In several medical and non-medical applications it is necessary to measure the human activities. Detection and monitoring of human activities requires the use of external sensors around the body. The reported design provides a systematic approach for characterization of states. The design employs a 3-axis accelerometer, a microcontroller and RS232 based communication protocol for sensing the activities of a person and the output will be seen on a PC with a graphical user interface. Experiments were conducted on human test subjects and …
Characterization Of Rf Propagation In Metal Pipes For Passive Rfid Systems, Darmindra Danaraj Arumugam
Characterization Of Rf Propagation In Metal Pipes For Passive Rfid Systems, Darmindra Danaraj Arumugam
Electrical Engineering Theses - Archive
In this paper we collect and extend the theory of radio frequency (RF) propagation as it relates to propagation within metal cylinders, or circular pipes. This work is motivated by a need to understand the operation of UHF radio frequency identification (RFID) systems when the tags are placed within the pipes. These circular pipes are shown to be similar to metal tube waveguides which are either hollow or filled with air. We derive the Bessel function that is used to identify the propagation constants, the different transverse electric and transverse magnetic modes, cut-off frequencies and the multi-mode attenuation. The cut-off …
Cmos Vco & Lna Implemented By Air-Suspended On-Chip Rf Mems Inductors, Varun K. Shenoy
Cmos Vco & Lna Implemented By Air-Suspended On-Chip Rf Mems Inductors, Varun K. Shenoy
Electrical Engineering Theses - Archive
In this thesis, a CMOS 2.4 GHz Low noise amplifier (LNA) and Voltage-controlled oscillator (VCO) was designed and simulated. These circuits were designed to operate in the 2.4GHz Industrial Scientific Medicine (ISM) band and to achieve Bluetooth and Wifi standard specifications. High-Q RF MEMS air-suspended circular spiral inductors are used in both circuits. High-Q inductors give the circuit better performance parameters including higher gain, lower noise figure and narrower bandwidth. The integration of these RF MEMS inductors onto RF circuit chips was carried out using the UV-LIGA technique and an additive pattern transfer technique such as electroplating. The LNA maintains …
Spatially Resolving Spectrometer For Characterisation Of Broad-Area Laser Diodes, Sheldon Fernandes
Spatially Resolving Spectrometer For Characterisation Of Broad-Area Laser Diodes, Sheldon Fernandes
Electrical Engineering Theses - Archive
The mode pattern of the BALD (Broad-Area Laser Diode) is characterized and measured using a 1-GHz resolution double-pass spectrometer. The design of spectrometer allowed also a spatial discrimination with 1mkm resolution. The construction and design of the double-pass grating is analyzed and discussed. A matrix approach is developed for the double-pass measurement arrangement. The developed procedure of analysis of spatially resolved spectra provides unique information about broad-area laser diode active medium and cavity geometry and potentially will help to predict the reliability of the laser diode. The developed model is based on paraxial approximation. The laser diode modes are measured …
Fabrication Of A Silicon Single Electron Transistor, Sharukh Roomy Chinoy
Fabrication Of A Silicon Single Electron Transistor, Sharukh Roomy Chinoy
Electrical Engineering Theses - Archive
Single electronics has bright prospects because of its high scalability. The single electron transistor (SET) which utilizes these principles could replace the current workhorse of the industry, the MOSFET. The SET is plagued with limitations such as, a low operating temperature, background charge issues, a low voltage gain and high output impedance. The current generation SET devices have overcome most of the aforementioned issues but use highly complicated fabrication techniques. Electron beam lithography was used to pattern device structures on silicon-on-insulator (SOI) wafers with a hydrogen silsesquioxane (HSQ) system being the resist. The silicon was then etched using HSQ as …