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Articles 1  23 of 23
FullText Articles in Engineering
Semiconductor PN Junction Space Charge Region Capacitance, Mohammad Humayun Habib
Semiconductor PN Junction Space Charge Region Capacitance, Mohammad Humayun Habib
Dissertations and Theses
The classical capacitance voltage characteristics based on the depletion approximation, is adequate at reverse bias, but introduces errors at high forward bias. Because of its inherent simplicity and compactness this classical depletion model is well studied and widely used in circuit simulators. In this work, a new model for the semiconductor space charge region (SCR) capacitance, based on physical justification, will be derived. This new model takes three input parameters, C0 , Vbi and m, thus eliminating the fitting parameter FC currently used in SPICE. This new model is applicable for any applied voltage and will be compared with the SCR ...
The Use Of Laboratory Testing To Understand The Behavior Of Collapsible Soil Upon Wetting, Martha H. Denham
The Use Of Laboratory Testing To Understand The Behavior Of Collapsible Soil Upon Wetting, Martha H. Denham
Dissertations and Theses
In developing a constitutive model that could predict the settlement due to the collapse, several goals needed to be met. These were to gain an understanding of the collapse phenomenon, knowing the soil properties at the natural water content and how they change after collapse, and develop and test the new model. It was felt that laboratory testing could be of use. The types of test conducted included use of the Oedometer, Pressuremeter, and Triaxial tests. The material that was used for the testing was a "generic" soil manufactured out of diatomite. In all of the tests the soil was ...
Minimization Of Exclusive Sum Of Products Expressions For MultipleValued Input Incompletely Specified Functions, Ning Song
Dissertations and Theses
In recent years, there is an increased interest in the design of logic circuits which use EXOR gates. Particular interest is in the minimization of arbitrary Exclusive Sums Of Products (ESOPs). Functions realized by such circuits can have fewer gates, fewer connections, and take up less area in VLSI and especially, FPGA realizations. They are also easily testable. So far, the ESOPs are not as popular as their Sum of Products (SOP) counterparts. One of the main reasons it that the problem of the minimization of ESOP circuits was traditionally an extremely difficult one. Since exact solutions can be practically ...
Applications Of Digital Signal Processing With Cardiac Pacemakers, Merry Thi Tran
Applications Of Digital Signal Processing With Cardiac Pacemakers, Merry Thi Tran
Dissertations and Theses
Because the voltage amplitude of a heart beat is small compared to the amplitude of exponential noise, pacemakers have difficulty registering the responding heart beat immediately after a pacing pulse. This thesis investigates use of digital filters, an inverse filter and a lowpass filter, to eliminate the effects of exponential noise following a pace pulse. The goal was to create a filter which makes recognition of a haversine wave less dependent on natural subsidence of exponential noise. Research included the design of heart system, pacemaker, pulse generation, and D sensor system simulations. The simulation model includes the following components: \ • Signal ...
A New Approach To The Decomposition Of Incompletely Specified Functions Based On Graph Coloring And Local Transformation And Its Application To Fpga Mapping, Wei Wan
Dissertations and Theses
The thesis presents a new approach to the decomposition of incompletely specified functions and its application to FPGA (Field Programmable Gate Array) mapping. Five methods: Variable Partitioning, Graph Coloring, Bond Set Encoding, CLB Reusing and Local Transformation are developed in order to efficiently perform decomposition and FPGA (LookupTable based FPGA) mapping. 1) Variable Partitioning is a high quality hemistic method used to find the "best" partitions, avoiding the very time consuming testing of all possible decomposition charts, which is impractical when there are many input variables in the input function. 2) Graph Coloring is another high quality heuristic\ used to ...
Mapping Programs To Parallel Architectures In The Real World, Dezheng Tang
Mapping Programs To Parallel Architectures In The Real World, Dezheng Tang
Dissertations and Theses
Mapping an application program to a parallel architecture can be described as a multidimensional optimization problem. To simplify the problem, we divide the overall mapping process into three sequential substeps: partitioning, allocating, and scheduling, with each step using a few details of the program and architecture description. Due to the difficulty in accurately describing the program and architecture and the fact that each substep uses incomplete information, inaccuracy is pervasive in the realworld mapping process. We hypothesize that the inaccuracy and the use of suboptimal, heuristic mapping methods may greatly affect the mapping or submapping performance and lead to a ...
Developing Image Processing Tools In X Window System, Xin Zhang
Developing Image Processing Tools In X Window System, Xin Zhang
Dissertations and Theses
The X Window System is an industrystandard software system which facilitates programmers to develop portable graphical user interfaces. This thesis describes an image processing tool developed under the X Window System. A multiwindow image display software with image editing and improvement functions is developed. The software has four modules: environment generation, image creation, image editing and image improvement. The environment generation module creates working windows, scrollbars, dialogbox and pulldown menu buttons, and tracks mouse cursor positions. The working windows are three adjacent windows allowing display of three different images simultaneously. The dialogbox provides an interface between the user and the ...
An Intelligent Database For Psubot, An Autonomous Wheelchair, Dieudonne Mayi
An Intelligent Database For Psubot, An Autonomous Wheelchair, Dieudonne Mayi
Dissertations and Theses
In the design of autonomous mobile robots, databases have been used mainly to store information on the environment in which the device is to operate. For most of the models and ready systems, the database when used, is not a stand alone component in the system, rather it is only intended to keep static information on the disposition and properties of objects on the map.
An Improved Formulation Of The Temperature Dependence Of The GummelPoon Bipolar Transistor Model Equations, ChorngLii Liou
An Improved Formulation Of The Temperature Dependence Of The GummelPoon Bipolar Transistor Model Equations, ChorngLii Liou
Dissertations and Theses
A number of shortcomings were found after complete derivation of the temperature dependence of equations, and the expressions related to the Early effect in the present GummelPoon 2 model, as implemented in the TEKSPICE program. The formulation and application of improved model equations is presented, followed by a detailed comparison of the existing model with the one developed in this work.
Performance Analysis Of Doa Estimation Algorithms Using Physical Parameters, Hui Liu
Performance Analysis Of Doa Estimation Algorithms Using Physical Parameters, Hui Liu
Dissertations and Theses
Analytical performance analysis on DirectionOfArrival (DOA) estimation algorithms has attracted much excellent research in recent years, various statistical properties have been revealed. However, in most of these analyses, insights of the performance were masked because of the involvement of singular values and singular vectors which depend on the character of the algorithms and data structures in a complex and nonlinear manner.
Hypoid Gear Optimization, Selvaraj Ramachandran
Hypoid Gear Optimization, Selvaraj Ramachandran
Dissertations and Theses
A hypoid gear optimization procedure using the method of feasible directions has been developed. The objective is to reduce the gear set weight with bending strength, contact strength and facewidthdiametral pitch ratio as constraints. The objective function weight, is calculated from the geometric approximation of the volume of the gear and pinion. The design variables selected are number of gear teeth, diametral pitch, and facewidth. The input parameters for starting the initial design phase are power to be transmitted, speed, gear ratio, type of application, mounting condition, type of loading, and the material to be used. In the initial design ...
Spontaneous Coherent Pulsations In StandingWave Laser Oscillators : Stability Criteria, Pitak Chenkosol
Spontaneous Coherent Pulsations In StandingWave Laser Oscillators : Stability Criteria, Pitak Chenkosol
Dissertations and Theses
The stability criteria for singlemode standingwave laser oscillators in the strongly homogeneously broadened limit are reported for the first time. Two types of stability criteria are presented. The first type, called type 1, corresponds to the minimum value of threshold parameter for which an infinitesimal perturbation away from steady state grows into an oscillatory solution. Another type of stability criteria, called type 2, corresponds to the minimum value of threshold parameter for which large amplitude oscillatory solutions do not decay to the steady state solution. Undamped pulsations in single mode strongly homogeneously broadened standingwave laser oscillators are found to occur ...
Improved Methodology For Limit States Finite Element Analysis Of Lattice Type Structures Using Nonlinear PostBuckling Member Performance, Markus Ostendorp
Improved Methodology For Limit States Finite Element Analysis Of Lattice Type Structures Using Nonlinear PostBuckling Member Performance, Markus Ostendorp
Dissertations and Theses
In an attempt to achieve more efficient designs, the technological frontier is pushed further and further. Every year science probes for a better understanding of natural phenomena, discovering new and improved methods to perform the same task more efficiently and with better results. One of the new technologies is the nonlinear analysis of structural systems using inelastic postbuckling member performance. Inelastic postbuckling member performance is defined as the constitutive relationship between axial load and displacement after the ultimate member capacity has been exceeded. A nonlinear analysis is able to predict the failure behavior of a structural system under ultimate loads ...
A PartitioningBased Approach To The Fitting Problem In Special Architecture Eplds, Steffan Goller
A PartitioningBased Approach To The Fitting Problem In Special Architecture Eplds, Steffan Goller
Dissertations and Theses
In this thesis, we describe an architecturedriven fitting algorithm for an ApplicationSpecific EPLD, the CY7C361, from Cypress Semiconductor. Traditional placement and routing tools for PLDs perform placement and routing separately. Several placement possibilities are created and the router tries to realize the connections between the physical locations of the cells on the chip. The Cypress CY7C361 has a very unique chip architecture with a highly limited connectivity between the physical cells. Therefore, it is necessary to consider the mutability when the placement of cells is performed. The combination of the two stages is called fitting. The specific architecturedependent constraints, imposed ...
Characterization Of Quantization Noise In Oversampled Analog To Digital Converters, Eric W. Multanen
Characterization Of Quantization Noise In Oversampled Analog To Digital Converters, Eric W. Multanen
Dissertations and Theses
The analog to digital converter (ADC) samples a continuous analog signal and produces a stream of digital words which approximate the analog signal. The conversion process introduces noise into the digital signal. In the case of an ideal ADC, where all noise sources are ignored, the noise due to the quantization process remains. The resolution of the ADC is defined by how many bits are in the digital output word. The amount of quantization noise is clearly related to the resolution of the ADC. Reducing the quantization noise results in higher effective resolution.
Multiplexed Pipelining : A Cost Effective Loop Transformation Technique, Satish Pai
Multiplexed Pipelining : A Cost Effective Loop Transformation Technique, Satish Pai
Dissertations and Theses
Parallel processing has gained increasing importance over the last few years. A key aim of parallel processing is to improve the execution times of scientific programs by mapping them to many processors. Loops form an important part of most computational programs and must be processed efficiently to get superior performance in terms of execution times. Important examples of such programs include graphics algorithms, matrix operations (which are used in signal processing and image processing applications), particle simulation, and other scientific applications. Pipelining uses overlapped parallelism to efficiently reduce execution time.
Improved I/O Pad Positions Assignment Algorithm For SeaOfGates Placement, ShyangKuen Her
Improved I/O Pad Positions Assignment Algorithm For SeaOfGates Placement, ShyangKuen Her
Dissertations and Theses
A new heuristic method to improve the I/O pad assignment for the seaofgates placement algorithm "PROUD" is proposed. In PROUD, the preplaced I/O pads are used as the boundary conditions in solving sparse linear equations to obtain the optimal module placement. Due to the total wire length determined by the module positions is the strong function of the preplaced I/O pad positions, the optimization of the I/O pad circular order and their assignment to the physical locations on the chip are attempted in the thesis. The proposed I/O pad assignment program is used as a ...
A New Method For Calculating The Economic Benefits Of Varying Degrees Of Power Factor Correction For Industrial Plant Loads, Mohammed Ishaque
A New Method For Calculating The Economic Benefits Of Varying Degrees Of Power Factor Correction For Industrial Plant Loads, Mohammed Ishaque
Dissertations and Theses
A comparative study of the economic benefits that can be obtained from different degrees of power factor correction for medium and small scale industrial installations is shown. A new approach for precise calculation of kws and kvars required at different power factors is presented. These calculated values are used to find the return on investments for the capacitors needed for power factor correction. The developed method is easy to use, cost effective, accurate and will help electrical engineers with minimum knowledge of power systems to precisely determine the savings available by improving the power factor of an industrial load.
Tapered Radio Frequency Transmission Lines, Vincent D. Matarrese
Tapered Radio Frequency Transmission Lines, Vincent D. Matarrese
Dissertations and Theses
A transformation used to obtain solutions for the beam parameter equation of fiber optics is applied to the second order differential equation for nonuniform transmission lines. Methods are developed for deriving possible transmission line tapers from known solutions of the transformed equation. This study begins with a comprehensive overview of previous work done to obtain closedform solutions for the transmission line equations. Limitations of the lumped parameter model are also discussed. As part of this thesis, a tapered transmission line is constructed, based on one of the solutions obtained from the fiber optics studies. A discussion of the design and ...
Ignoring Interprocessor Communication During Scheduling, Chintamani M. Patwardhan
Ignoring Interprocessor Communication During Scheduling, Chintamani M. Patwardhan
Dissertations and Theses
The goal of parallel processing is to achieve high speed computing by partitioning a program into concurrent parts, assigning them in an efficient way to the available processors, scheduling the program and then executing the concurrent parts simultaneously. In the past researchers have combined the allocation of tasks in a program and scheduling of those tasks into one operation. We define scheduling as a process of efficiently assigning priorities to the already allocated tasks in a program. Assignment of priorities is important in cases when more than one task at a processor is ready for execution. Most heuristics for scheduling ...
Effectiveness Of Additive Correction Multigrid In Numerical Heat Transfer Analysis When Implemented On An Intel Ipsc2, James D. Padgett
Effectiveness Of Additive Correction Multigrid In Numerical Heat Transfer Analysis When Implemented On An Intel Ipsc2, James D. Padgett
Dissertations and Theses
The effectiveness of the Additive Correction Multigrid (ACM) algorithm, a linebyline Tridiagonal Matrix Algorithm (TDMA), and simple GaussSeidel (GS) iteration in numerical heat transfer analysis is investigated on a conventional single processor computer and on a distributed memory parallel computer. The performance of these methods is studied by solving a twodimensional, steady heat conduction problem. The execution time of ACM on a single processor is proportional to the number of unknowns to the 1.5 power. This is in contrast to the execution time of the TDMA for which the execution time is proportional to the number of unknowns to ...
Parameter Uncertainty And Modeling Of Sludge Dewatering In One Dimension, Joseph H. Plaskett
Parameter Uncertainty And Modeling Of Sludge Dewatering In One Dimension, Joseph H. Plaskett
Dissertations and Theses
Separation of liquid from solids is a necessary step in the ultimate disposal of wastewater sludges. Most commonly, sludges are dewatered by pressurefiltration methods. Mathematical models of the physics of the sludge dewatering process would provide the ability to predict dewatering performance and optimize the design and operation of dewatering facilities.
A GazeAddressing Communication System Using Artificial Neural Networks, Gabriel BaudBovy
A GazeAddressing Communication System Using Artificial Neural Networks, Gabriel BaudBovy
Dissertations and Theses
Severe motor disabilities can render a person almost completely incapable of communication. Nevertheless, in many cases, the sensory systems are intact and the eye movements are still under good control. In these cases, one can use a device such as the Brain Response Interface (BRI) to command a remote control (e.g. room temperature, bed position), a wordprocessor, a speech synthesizer, and so on.