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 Algorithms (2)
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Articles 1  17 of 17
FullText Articles in Engineering
On Modeling Of A Mobile Multipath Fading Channel, Heng Xiao
On Modeling Of A Mobile Multipath Fading Channel, Heng Xiao
Dissertations and Theses
Multipath fading is one of the major practical concerns in wireless communications. A multipath transmission takes place when a transmitted signal arrives at a receiver by two or more paths of different delay. Such multiple paths may be due to atmospheric reflection or refraction, or reflections from buildings or other objects. A multipath fading channel is usually modeled as a timevariant tapped delay system. RAKE receiver can be used to detect the signal from the multipath fading channel. However, the number of delay taps, the time delay of each path, and the tap weight for each delay path need to ...
Methodology For Accurate Speedup Prediction, Aruna Chittor
Methodology For Accurate Speedup Prediction, Aruna Chittor
Dissertations and Theses
The effective use of computational resources requires a good understanding of parallel architectures and algorithms. The effect of the parallel architecture and also the parallel application on the performance of the parallel systems becomes more complex with increasing numbers of processors. We will address this issue in this thesis, and develop a methodology to predict the overall execution time of a parallel application as a function of the system and problem size by combining simple analysis with a few experimental results. We show that runtimes and speedup can be predicted more accurately by analyzing the functional forms of the sequential ...
Predicting Solute Transport In Natural Streams  A Stochastic Approach, Xueqing Zhou
Predicting Solute Transport In Natural Streams  A Stochastic Approach, Xueqing Zhou
Dissertations and Theses
The existing theories for predicting longitudinal dispersion in straight open channels have long been recognized as inadequate when applied to natural rivers. These theories tend to grossly underestimate dispersion in real streams since an important mixing mechanism due to nonuniform river crosssection variations is not explicitly taken into account. Recognizing the important role of stream irregularities on solute transport and the analytical difficulties of classical deterministic analysis, we develop a stochastic approach for analyzing solute transport in natural streams. Variations in river width and bed elevation are conveniently represented as onedimensional random fields, characterized by their autocorrelation functions. Advection and ...
Erp Analysis Using Matched Filtering And Wavelet Transform, Xueming Lin
Erp Analysis Using Matched Filtering And Wavelet Transform, Xueming Lin
Dissertations and Theses
Event related potentials (ERP's) carry very important information that relates to the performance of the brain functions of the human being. Further studies have identified that one component, in particular, P 300, is affected by the memory process. Matched filter is used to improved the SNR of signal ERP' s. We use the output of the matched filter to distinguish the difference of the waveforms between normal subjects and memoryimpaired subjects. In our study, we found that the peak values of the matched filtering output were different between normal subjects and memoryimpaired subjects. Also, as an application, wavelet transform ...
Two Dimensional Finite Element Modeling Of Swift Delta Soil Nail Wall By "Abaqus", Richard James Barrows
Two Dimensional Finite Element Modeling Of Swift Delta Soil Nail Wall By "Abaqus", Richard James Barrows
Dissertations and Theses
Soil nail walls are a form of mechanical earth stabilization for cut situations. They consist of the introduction of passive inclusions (nails) into soil cut lifts. These nailed lifts are then tied together with a structural facing (usually shotcrete) . The wall lifts are constructed incrementally from the top of cut down. Soil nail walls are being recognized as having potential for large cost savings over other alternatives. The increasing need to provide high capacity roadways in restricted rights of way under structures such as bridges will require increasing use of techniques such as combined soil nail and piling walls. The ...
High Level Preprocessor Of A VhdlBased Design System, Karthikeyan Palanisamy
High Level Preprocessor Of A VhdlBased Design System, Karthikeyan Palanisamy
Dissertations and Theses
This thesis presents the work done on a design automation system in which highlevel synthesis is integrated with logic synthesis. DIADESfa design automation system developed at PSU, starts the synthesis process from a language called ADL. The major part of this thesis deals with transforming the ADL based DIADES system into a VHDL based DIADES system. In this thesis I have upgraded and modified the existing DIADES system so that it becomes a preprocessor to a comprehensive VHDL based design system from Mentor Graphics. The highlevel synthesis in the DIADES system includes two stages: data path synthesis and control unit ...
An Analysis Of Approaches To Efficient Hardware Realization Of Image Compression Algorithms, Kamran Iravani
An Analysis Of Approaches To Efficient Hardware Realization Of Image Compression Algorithms, Kamran Iravani
Dissertations and Theses
In this thesis an attempt has been made to develop a fast algorithm to compress images. The ReedMuller compression algorithm which was introduced by Reddy & Pai [3] is fast, but the compression factor is too low when compared to the other methods. In this thesis first research has been done to improve this method by generalizing the ReedMuller transform to the fixed polarity ReedMuller form. This thesis shows that the Fixed Polarity ReedMuller transform does not improve the compression factor enough to warrant its use as an image compression method. The paper, by Reddy & Pai [3], on ReedMuller image compression ...
Minimization Of Generalized ReedMuller Expansion And Its SubClass, Xiaoqiang Zeng
Minimization Of Generalized ReedMuller Expansion And Its SubClass, Xiaoqiang Zeng
Dissertations and Theses
Several classes of ANDEXOR circuit expressions have been defined and their relationship have been shown. A new class of ANDEXOR circuit, the Partially Mixed Polarity ReedMuller Expression(PMPRM), which is a subclass of the Generalized ReedMuller expression, is created, along with an efficient minimization algorithm. This new AND/EXOR circuit form has the following features: • Since this subfamily of ESOP (with a total of n2nI22ni  (n1)2n forms which includes the 2n FixedPolarity ReedMuller forms) is much larger than the Kronecker ReedMuller(KRM) expansion(with 3n forms), generally the minimal form of this expansion will be much closer to the ...
Reflection And Refraction Of Light From Nonlinear Boundaries, Mohammad Azadeh
Reflection And Refraction Of Light From Nonlinear Boundaries, Mohammad Azadeh
Dissertations and Theses
This thesis deals with the topic of reflection and refraction of light from the boundary of nonlinear materials in general, and saturating amplifiers in particular. We first study some of the basic properties of the light waves in nonlinear materials. We then develop a general formalism to model the reflection and refraction of light with an arbitrary angle of incidence from the boundary of a nonlinear medium. This general formalism is then applied to the case of reflection and refraction from the boundary of linear dielectrics. It will be shown that in this limit, it reduces to the well known ...
Circuit Modeling Of Switched Linear Networks, Fardin Ansari
Circuit Modeling Of Switched Linear Networks, Fardin Ansari
Dissertations and Theses
The use of switched linear networks is prevalent in power processing systems such as dctodc power converters. These converters provide regulated dc output power and are widely used in the power supplies for computers and peripherals. As with most systems where high performance is a criterion, the power converter is usually enclosed in a feedback loop. Feedback design usually entails the use of small signal (linear) models with linear feedback design techniques. There exists a large number of small signal models, but most of them are ad hoc. A describing function approach has previously been presented which determines the exact ...
The Design, Realization And Testing Of The Ilu Of The Ccm2 Using Fpga Technology, David W. Foote
The Design, Realization And Testing Of The Ilu Of The Ccm2 Using Fpga Technology, David W. Foote
Dissertations and Theses
Most existing computers today are built upon a subset of the arithmetic system which is based upon the foundation of set theory. All formal systems can be expressed in terms of arithmetic and logic on current arithmetic computers through an appropriate model, then work with the model using software manipulation. However, severe speed degradation is the price one must pay for using a softwarebased approach, making several highlevel formal systems impractical. To improve the speed at which computers can implement these highlevel systems, one must either design special hardware, implementing specific operations much like math and image processing coprocessors, or ...
HighFrequency Analog Voltage Converter Design, Ping Xu
HighFrequency Analog Voltage Converter Design, Ping Xu
Dissertations and Theses
For many highspeed, highperformance circuits, purely differential inputs are needed. This project focuses on building highspeed voltage converters which can transfer a singleended signal to a purely differential signal, or a differential input signal to a singleended signal. Operational transconductance amplifier (OTAs) techniques are widely used in highspeed continuoustime integrated analog signal processing (ASP) circuits because resistors, inductors, integrators, buffers, multipliers and filters can be built by OT As and capacitors. Taking advantage of OT As, veryhighspeed voltage converters are designed in CMOS technology. These converters can work in a frequency range from DC (OHz) up to lOOMHz and higher ...
An Analysis Of The LinkedPulse In SteadyState Free Precession In Mri, Fang Li
An Analysis Of The LinkedPulse In SteadyState Free Precession In Mri, Fang Li
Dissertations and Theses
The steadystate free precession (SSFP) is one type of the fast scanning technique in MRI. So far most of its analysis are concentrated on the gradient echo SSFP (GR SSFP), very few paper~discuss the spin echo (SSFP (SE SSFP), and they are usually based on the simplified the hard pulse assumption. The advantage of the SE SSFP is that it can refocus the dephasing caused by the magnetic field inhomogeniety, which is the disadvantage of the GR SSFP. Also the hard pulse model can provide very limited information. The purpose of this paper is to establish the soft pulse ...
Performance Evaluation Tools For Interconnection Network Design, Anna Kolinska
Performance Evaluation Tools For Interconnection Network Design, Anna Kolinska
Dissertations and Theses
A methodology is proposed for designing performance optimized computer systems. The methodology uses software tools created for performance monitoring and evaluation of parallel programs, replacing actual hardware with a simulator modeling the hardware under development. We claim that a software environment can help hardware designers to make decisions on the architectural design level. A simulator executes real programs and provides access to performance monitors from user's code. The performance monitoring system collects data traces when running the simulator and the performance analysis module extracts performance data of interest, that are later displayed with visualization tools. Key features of our ...
Laser Resonators Using Tiered Fresnel Mirrors, Bruce Dale Ulrich
Laser Resonators Using Tiered Fresnel Mirrors, Bruce Dale Ulrich
Dissertations and Theses
A reflective Tiered Fresnel Zone Plate, herein called a Tiered Fresnel Mirror TFM, with a focal length on the order of a meter is studied for use as the mirror(s) in a FabryPerot interferometer type of laser. The relative phase transition within the individual zones (ideally smooth from zero to pi ) is stairstepped or tiered in the longitudinal direction of the mirror. Within an individual zone the step height is constrained to a constant whereas the width of the tiers are monotonically decreased when traversing radially outward so that the overall profile follows the ideal smooth curve. The effectiveness ...
Adaptive Notch Filter, Yuchen Huang
Adaptive Notch Filter, Yuchen Huang
Dissertations and Theses
The thesis presents a new adaptive notch filter (ANF) algorithm that is more accurate and efficient and has a faster convergent rate than previous ANF algorithms. In 1985, Nehorai designed an infinite impulse response (UR) ANF algorithm that has many advantages over previous ANF algorithms. It requires a minimal number of parameters with constrained poles and zeros. It has higher stability and sharper notches than any ANF algorithm until now. Because of the special filter structure and the recursive prediction error (RPE) method, however, the algorithm is very sensitive to the initial estimate of the filter coefficient and its covariance ...
Logic Synthesis With High Testability For Cellular Arrays, Andisheh Sarabi
Logic Synthesis With High Testability For Cellular Arrays, Andisheh Sarabi
Dissertations and Theses
The new Field Programmable Gate Array (FPGA) technologies and their structures have opened up new approaches to logic design and synthesis. The main feature of an FPGA is an array of logic blocks surrounded by a programmable interconnection structure. Cellular FPGAs are a special class of FPGAs which are distinguished by their fine granularity and their emphasis on local cell interconnects. While these characteristics call for specialized synthesis tools, the availability of logic gates other than Boolean AND, OR and NOT in these architectures opens up new possibilities for synthesis. Among the possible realizations of Boolean functions, XOR logic is ...