Physical Sciences and Mathematics Commons^™

Deterministic Linear Predictors For Bit Rate Improvement, Dhanvant H. Goradia

Electrical & Computer Engineering Theses & Dissertations

This thesis addresses the application of deterministic linear predictor s for telemetry based systems. Deterministic linear predictors are considered as a viable alternative to block transform coding in order to achieve bit rate reduction. A method of calculating the predictor coefficients of a deterministic linear predictor is presented. The system model is developed parametrically with respect to the bandwidth, polynomial order, signal class and predictor length. Two classes of signals, deterministic and random are analyzed and bounds on the performance of the deterministic linear predictor are established. A family of six pole Butterworth filters are used as presample filters in …

A Systolic Parsing Algorithm For A Visual Programming Language, Adam W. Bojanczyk, Takayuki Dan Kimura

All Computer Science and Engineering Research

In this paper we consider a problem of parsing a two-dimensional visual programming language Show and Tell on a two-dimensional array of processors. A program in Show and Tell is a bit-mapped, two-dimensional pattern satisfying a certain set of grammatical rules. The pattern consists of partially ordered set of rectilinear boxes and arrows distributed over the space of nxn pixel area. The corresponding directed graph, the box graph, where boxes are nodes and arrows are directed edges, may not have a cycle in a Show and Tell program. The cycle detection is the most computationally intensive stage of the parsing …

Show And Tell User's Manual, Peter Mclain, Takayuki Dan Kimura

All Computer Science and Engineering Research

The purpose of this report is to introduce essential features of the Show and Tell Language system to those computer users who are already familiar with some high-level programming language such as FORTRAN, BASIC or PASCAL. This manual is not intended for school children. Some familiarity with the Macintosh user interface and the MacPaint application program is assumed. It is also assumed that the Show and Tell application program disk and the Sample program are available to the reader. The basic programming concepts in Show and Tell are introduced in Chapter Three. The reader may find it easer to start …

Lsim User Manual, Roger D. Chamberlain

All Computer Science and Engineering Research

Lsim is a gate/switch level digital logic similar. It enables users to model digital circuits both at the gate and switch level and incorporates features that support investigation of the simulation task itself. This user's manual describes the procedures used to specify a circuit to lsim and control the simulation of the circuit (i.e., specifying inputs vectors, running the simulation, and monitoring output signals).

An Exact Analysis For Efficient Computation Of Random-Pattern Testability In Combinational Circuits, Sharad C. Seth, Bhargab B. Bhattacharya, Vishwani Agrawal

School of Computing: Conference and Workshop Papers

Experimental evidence shows that low testability in a typical circuit is much more likely due to poor observability than poor controllability. Thus, from theoretical and practical standpoints, it is important to develop an accurate model for observability computation. One such model, in terms of supergates, is proposed in the first part of this paper thus complimenting our earlier work. It is now possible to obtain exact random-pattern testability for each line in a circuit.

The second part of the paper analyzes the supegate structure of a circuit from a graph theoretic viewpoint. Finding a supergate is related to determining the …

Investigation Of Electronic Holography Using Spice Computer Simulation Experiments, Monish Ranjan Chatterjee

Electrical and Computer Engineering Faculty Publications

Using SPICE experiments, it has been possible to verify most of the important aspects of electronic holography. The generation and properties of dynamic echoes under different types of nonlinearities have been extensively tested, and some new information has been garnered in the process. The case of pulse and generalized memory echoes has also been tested, and the results have been fairly satisfactory. Most of all, the simplicity with which the intriguing concept of memory echoes has translated into the circuit implementation on SPICE, and the closeness of the results to predicted behavior have been somewhat of a pleasant surprise.

Since …

Statistics On Logic Simulation, K. F. Wong, Mark A. Franklin, Roger D. Chamberlain, B. L. Shing

All Computer Science and Engineering Research

The high costs associated with logic simulation of large VLSI based systems have led to the need for new computer architectures tailored to the simulation task. Such architecture have the potential for significant speedups over standard software based logic simulators. Several commercial simulation engines have been produced to satisfy need in this area. To properly explore the space of alternative simulation architectures, data is required on the simulation process itself. This paper presents a framework for such data gathering activity by first examining possible sources of speedup in the logic simulation task, examining the sort of data needed in the …

Randomized Routing On Fat-Trees, Ronald I. Greenberg

Computer Science: Faculty Publications and Other Works

Fat-trees are a class of routing networks for hardware-efficient parallel computation. This paper presents a randomized algorithm for routing messages on a fat-tree. The quality of the algorithm is measured in terms of the load factor of a set of messages to be routed, which is a lower bound on the time required to deliver the messages. We show that if a set of messages has load factor lambda on a fat-tree with n processors, the number of delivery cycles (routing attempts) that the algorithm requires is O(lambda+lgnlglgn) with probability 1-O(1/ …

Analog Computer Simulation With Automatic Scaling By Digital Computer, Mark Anthony Motter

Electrical & Computer Engineering Theses & Dissertations

A computer-aided design approach for the simplification of analog computer simulation is presented. The simulation configuration consists of an EAI 2000 analog computer with serial communications link to a PDP — 11/24 digital computer. Under control of the PDP-11, the analog simulations are realized with appropriate time and magnitude scaling which adjusts the range of the simulation coefficients and prevents overloads of the analog components. The analog computer hardware configuration accommodates both stable plants up to eighth order and closed-loop systems up to tenth order. Cascade compensation is provided for the closed-loop systems.

The plant may be described by either …

On The Probable Performance Of Graph Coloring Algorithms, Jonathan S. Turner

All Computer Science and Engineering Research

We define a natural probability distribution over the set of k-colorable graphs on n vertices and study the probable performance of several algorithms on graphs selected from this distribution. The main results are listed below. • We describe an algorithm to determine if a given n vertex graph is k-colorable, which runs in time O(n + m log k), where m is the number of edges. We show that this algorithm can successfully identify almost all random k-colorable graphs for constant or slowly growing values of k. • We show that an algorithm proposed by Brelas, and justified on experimental …

Collecting Data About Logic Simulation, Roger D. Chamberlain, Mark A. Franklin

All Computer Science and Engineering Research

Design of high performance hardware and software based gate-switch level logic simulators requires knowledge about the logic simulation process itself. Unfortunately, little data is publically available concerning key aspects of this process. An example of this is the lack of published empirical measurements relating to the time distribution of events generated by such simulators. This paper presents a gate-switch level logic simulator lsim which is oriented towards the collection of data about the simulation process. The basic components of lsim are reviewed, and its relevant data gathering facilities are discussed. An example is presented which illustrates the use of lsim …

Impacts Of Robotics And Flexible Manufacturing Technologies On Manufacturing Costs And Employment, Steven M. Miller

Research Collection School Of Computing and Information Systems

The issues analyzed in this paper are the extent to which unit costs and production labor requirements might be reduced in manufacturing industries if there is more widespread use of industrial robots and flexible systems. The analysis is reported in detail in Miller (1983). These issues are analyzed from two different perspectives. The technological focus of the first perspective is narrowly confined to the use of robotic manipulators. It is assumed that robotic manipulators will be “retrofitted” into existing production facilities without making major changes in the organization of production within the factory, other than modifying individual work stations so …

Block Encoding Of Speech Spectral Principal Components, James R. Holland Jr.

Electrical & Computer Engineering Theses & Dissertations

A Karhunen-Loeve series expansion was used to block encode speech spectral principal components as a function of time. Each of ten principal components was first obtained as a linear combination of 2© speech spectral band energies. Using a fixed block length of 10 frames (0.128 s), the K-L basis vectors were computed separately for various speakers for each principal component. In all cases the resulting basis vectors were essentially a set of discrete cosine basis vectors. Synthesis of speech from the block encoded parameters showed that very little information is lost with up to 70% data reduction. The block encoding …

Suboptimal Algorithms For Improvement Of Pipeline Through Insertion Of Delays, Sukhamoy Som

Electrical & Computer Engineering Theses & Dissertations

Pipelining is now widely used in the design of high speed processors in order to overcome the intrinsic speed limitations imposed by the technology. For a good performance and avoidance of internal conflicts, the concurrent operations within different subunits of a pipeline architecture should be properly scheduled This scheduling problem is known to be intrinsically difficult" and a member of the "NP complete class of problems. The aim of this thesis is to develop heuristic suboptimal algorithms whose execution time is a polynomial function of the number of items to be scheduled. Insertion of delay is used as a basic …

Ads Formal Semantics, Takayuki Kimura

All Computer Science and Engineering Research

Abstract Database System (ADS) is a data model developed for an enduring medical information system where frequent changes in the conceptual schema are anticipated and multi-level abstraction is required. The mechanism of abstraction in ADS is based on the abstraction operator of the lamba calculus. The formal semantics of a subset of the ADS model is presented using the denotational specification method.

Robotic Realities: Near Term Prospects And Problems, Robert U. Ayres, Steven M. Miller

Research Collection School Of Computing and Information Systems

Industrial robots are automation, but with a difference. Other machine tools are extensions of human capabilities, while robots are seen mainly as substitutes for human workers. Robots will find most of their industrial applications during the next decade or two in the metal-working sectors, where they will begin to displace semiskilled machine operatives in medium to large batch production operations. They cannot substitute for skilled machinists or other workers doing nonroutine jobs, or specialized, dedicated hard automation used in mass production. The current generation of robots, lacking sensory data processing and interpretation capabilities, can potentially replace up to 1.3 million …

Self‐Refraction Of Nonlinear Capillary‐Gravity Waves, Partha P. Banerjee, Adrianus Korpel, Karl E. Lonngren

Electrical and Computer Engineering Faculty Publications

Self‐refraction effects have been observed during the propagation of deep‐water capillary‐gravity waves. The observations are shown to be in qualitative agreement with the theory of self‐focusing and defocusing in a cubically nonlinear medium in the presence of diffraction.

Some Design Considerations For Picture Archiving And Communication Systems, J. R. Cox, G. J. Blaine, R. L. Hill, R. G. Jost, C. D. Shum

All Computer Science and Engineering Research

Design considerations for picture archiving and communication systems are reviewed with special emphasis on those issues that differ from conventional network architectures. Design equations for three layers of a picture network are developed and discussed in the context of preliminary estimates of the flow of digital images between a multiplicity of picture sources, picture archives and picture viewing stations. Discussions of differences from conventional networks focuses on the local nature of the net, the availability of a wide-band transmission media with low error rates, the relative costliness of network equipment capable of taking advantage of the wide-band transmission media and …

Subharmonic Generation By Resonant Three‐Wave Interaction Of Deep‐Water Capillary Waves, Partha P. Banerjee, Adrianus Korpel

Electrical and Computer Engineering Faculty Publications

Subharmonic generation has been observed during the propagation of deep‐water capillary waves. The observations are shown to be in agreement with the theory of degenerate resonant noncollinear three‐wave interaction in a nonlinear, dispersive medium.

Interfacing The Sdk-85 With Common Laboratory Equipment, Thomas A. Boerjan

Graduate Research Papers

The-SDK-85 is a low-cost microcomputer trainer well-suited for entry and intermediate level programming and also interfacing. From it the fundamentals of digital electronics and computer programming can be taught at the high school and college level. The objectives of this paper are to learn:

1. The basic hardware required for a simple computer trainer.

2. The software necessary to do simple tasks.

3. How to interface the SDK-85 to common laboratory equipment.

4. How industry is using digital electronics.

5. Basic hardware and software troubleshooting • techniques.

6. Instructional methodology to be used with the SDK-85.

Development Of An On-Line Computer System For Enzyme Kinetics Studies, Jacqueline R. Thweatt

Chemistry & Biochemistry Theses & Dissertations

The PDP-11/10 minicomputer was interfaced to the Beckman 25 ultraviolet/visible spectrophotometer and this on-line computer system was applied to enzyme kinetics studies. This interface involved hardware equipment to locate, amplify, and transmit the analog signal to an analog-to-digital converter, and software to acquire and store the digital data. Data processing programs were used to calculate kinetic parameters and statistical information from the acquired data.

The Varian Cary 219 ultraviolet/visible spectrophotometer can be readily interfaced to the Apple II Plus microcomputer by hardware equipment which can be purchased from the manufacturer. Various software may also be purchased for use in enzyme …

Octal-Tree Spatial Sorting And Its Applications, Jeffrey L. Posdamer

All Computer Science and Engineering Research

An octal tree subdivision recursively divides a bounded three-dimensional volume into octanta about an internal division point. This scheme has been used to represent cellular or enumerated voxel models of solid objects. Given one or more sets of points sampled from the surface of a solid, an octal tree may be generated in which each leaf node contains m or less points. By specifying the tree traversal rule, the points are accessed in a sorted order. By defining m=3, a divide-and-conquer surface triangulation algorithm may be developed which does not require special sampling conditions (such as co-planarity) on subsets of …

Robotics And The Conservation Of Human Resources, Robert U. Ayres, Steven M. Miller

Research Collection School Of Computing and Information Systems

Due to rapid expansion in the field of robotics, policy issues have arisen in regard to developing human skills to deal with the new technology and to deal with the obsolescent human skills which are the inevitable result of this growth pattern. Industrialists, educators, union leaders, and government officials must work cooperatively to insure that the coming changes are made with minimum disruption. Improved training methods and courses have to be developed for the skills needed to control, manage and supervise the new machines. Some of the ways in which this can be accomplished are through offering financial incentives for …

A Direct Formulation And Computer-Implementation Of A Symbolic Network Analysis Algorithm, Timothy James Knerr

Electrical & Computer Engineering Theses & Dissertations

An algorithm for the symbolic analysis of linear, time-invariant, active or passive networks is presented. The algorithm incorporates the best features of earlier numerical and topological methods of symbolic analysis. A hybrid set of equations is formulated for a closed linear graph and arranged in matrix form. A numerical evalu­ation procedure for the determinant of this hybrid matrix results in an efficient method of symbolic analysis. A proof of the algorithm based on determinant evaluation by a permutation product expansion provides insight into relationships with other methods of symbolic analysis. A computer program implementation of the algorithm is described and …

A Critical Study Of Nonlinear Echo Phenomena, Monish Ranjan Chatterjee

Electrical and Computer Engineering Faculty Publications

The present thesis attempts to give a concise and critical account of the evolution of the echo phenomena over the last thirty years. Starting with spin and photon echoes, which were among the earliest to be observed and studied, the thesis explores the experimental findings and the models proposed in connection with the more contemporary echo experiments, viz. those involving electroacoustic or polarization echoes in single and polycrystalline piezoelectric materials and in powders. Although the investigations regarding the various mechanisms of short and long term echo formation are by no means complete, a coherent picture is beginning to emerge as …

An Abstract Model Of Unstratified Database System, Takayuki D. Kimura, Jerome R. Cox Jr., Will D. Gillett

All Computer Science and Engineering Research

A semantic data model is introduced with the following capabilities: (1) Abstraction mechanisms for aggregation, generalization and classification, (2) Unstratified control of the database content, (3) Refined control of intentional and extensional information, and (4) Extensive semantic consistency checking. The basic features of the model are illustrated through a scenario of interactions between the user and the database system (using the proposed model) for constructing a simple database on technical publications.

Design Studies Suggested By An Abstract Model For Medical Information System, Jerome R. Cox Jr., Takayuki D. Kimura, P. Moore, Will D. Gillett, Mishell J. Stucki

All Computer Science and Engineering Research

We have developed a formal model of a database system that is unusual in that it has the ability to represent information about its own structure and to insure semantic consistency. The model distinguishes general laws from instances of events and objects, but many of its mechanisms serve both categories of information. The model form a substrate upon which an information structure appropriate to neonatology is being developed. Some example queries are shown and a design study for an associative memory suggested by the model is described briefly.

Synchronization Strategies, Mishell J. Stucki, Jerome R. Cox Jr

All Computer Science and Engineering Research

Computing systems are now frequently composed of independently clocked subsystems that cooperate to perform the function desired for the whole. This type of architecture has many advantages and promises to be the standard for the foreseeable future. With the trend towards more and more gates per chip, the number of chips per subsystem gets smaller and smaller, and we can expect to soon see one or more subsystems per chip. This transition will require contributions from disciplines previously outside the field of chip design, and every issue will have to be carefully worked out beforehand because debugging chips of this …

Information Systems For Natural Resources Managers: An Exercise In Interfacing, Connie L. Knapp

Marine Affairs Theses and Major Papers

This thesis proposes guidelines for achieving the human interfaces which are requisite to the development and operation of natural resources information systems. Conclusions were drawn from an evaluation of past experiences in building and attempting to use these types of systems. Both successful and unsuccessful systems were considered, as well as the current effort in Rhode Island to develop a system for coastal resources managers. Examples are presented to support particular conclusions and recommendations. The perspective is nontechnical. Examples and recommendations, therefore, are conceptual rather than quantitative or technical. While a variety of mechanisms can be used to achieve the …

Comparative Cost Analysis Of Implementing Computer Assisted Instruction On General Purpose Computers, Minicomputers, Or Time-Shared Systems, William Henderson Trueheart Junior

College of Graduate Studies: Theses & Dissertations (1964–2006)

No abstract provided.