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Purdue University

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1991

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Unix And Security: The Influences Of History, Eugene H. Spafford Dec 1991

Unix And Security: The Influences Of History, Eugene H. Spafford

Department of Computer Science Technical Reports

No abstract provided.


Three Letters On Computer Security And Society, Eugene H. Spafford Dec 1991

Three Letters On Computer Security And Society, Eugene H. Spafford

Department of Computer Science Technical Reports

No abstract provided.


User Authentication And Related Topics: An Annotated Bibliography, Eugene H. Spafford, Stephen A. Weeber Dec 1991

User Authentication And Related Topics: An Annotated Bibliography, Eugene H. Spafford, Stephen A. Weeber

Department of Computer Science Technical Reports

No abstract provided.


The Combinatorics Of Algebraic Splines, Chanderjit L. Bajaj Dec 1991

The Combinatorics Of Algebraic Splines, Chanderjit L. Bajaj

Department of Computer Science Technical Reports

No abstract provided.


Visualization Of Four Dimensional Space And Its Applications (Ph.D. Thesis), Jianhua Zhou Dec 1991

Visualization Of Four Dimensional Space And Its Applications (Ph.D. Thesis), Jianhua Zhou

Department of Computer Science Technical Reports

No abstract provided.


Methodologies For Voltage Contingency Ranking, James Matthew Kulaga Dec 1991

Methodologies For Voltage Contingency Ranking, James Matthew Kulaga

Department of Electrical and Computer Engineering Technical Reports

Contingency studies in interconnected electric power systems are performed to assess the capability of a system to withstand disturbances caused by equipment outages and other factors, and are relevant to the area of power system security. Due to the large size and complexity of modern power systems, accurate techniques for measuring the effect of line contingencies are often time consuming and impose a heavy computational burden. Thus, ranking methods are used to define a subset of the most severe contingencies to be studied in full detail. Contingencies are classified into voltage contingencies and power contingencies; the term voltage contingency refers …


The Use Of Non-Cylindrically-Symmetric Sources In The Holographic Measurement Of Plane Wave Reflection Coefficients, J Stuart Bolton, Ziqiang Hu Dec 1991

The Use Of Non-Cylindrically-Symmetric Sources In The Holographic Measurement Of Plane Wave Reflection Coefficients, J Stuart Bolton, Ziqiang Hu

Publications of the Ray W. Herrick Laboratories

No abstract provided.


Optimal Parallel Algorithms For Periods, Palindromes And Squares (Preliminary Version), Alberto Apostolico, Dany Breslauer, Zvi Galil Nov 1991

Optimal Parallel Algorithms For Periods, Palindromes And Squares (Preliminary Version), Alberto Apostolico, Dany Breslauer, Zvi Galil

Department of Computer Science Technical Reports

No abstract provided.


Gcache: A Generalized Caching Mechanism, Douglas E. Comer, Shawn Ostermann Nov 1991

Gcache: A Generalized Caching Mechanism, Douglas E. Comer, Shawn Ostermann

Department of Computer Science Technical Reports

No abstract provided.


An Organization Of Sparse Gauss Elimination For Solving Pdes On Distributed Memory Machines, Mo Mu, John R. Rice Nov 1991

An Organization Of Sparse Gauss Elimination For Solving Pdes On Distributed Memory Machines, Mo Mu, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.


How To Count Quickly And Accurately: A Unified Analysis Of Probabilistic Counting And Other Related Problems, Peter Kirschenhofer, Helmut Prodinger, Wojciech Szpankowski Nov 1991

How To Count Quickly And Accurately: A Unified Analysis Of Probabilistic Counting And Other Related Problems, Peter Kirschenhofer, Helmut Prodinger, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.


A Declarative View Of Inheritance In Logic Programming, M. Bugliesi Nov 1991

A Declarative View Of Inheritance In Logic Programming, M. Bugliesi

Department of Computer Science Technical Reports

No abstract provided.


Unstructured Scheduling In Parallel Pde Sparse Solvers On Distributed Memory Machines, Mo Mu, John R. Rice Nov 1991

Unstructured Scheduling In Parallel Pde Sparse Solvers On Distributed Memory Machines, Mo Mu, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.


Neural Networks For Constrained Optimization Problems, Walter E. Lillo, Stefen Hui, Stanislaw H. Zak Nov 1991

Neural Networks For Constrained Optimization Problems, Walter E. Lillo, Stefen Hui, Stanislaw H. Zak

Department of Electrical and Computer Engineering Technical Reports

This paper is concerned with utilizing neural networks and analog circuits to solve constrained optimization problems. A novel neural network architecture is proposed for solving a class of nonlinear programming problems. The proposed neural network, or more precisely a physically realizable approximation, is then used to solve minimum norm problems subject to linear constraints. Minimum norm problems have many applications in various areas, but we focus on their applications to the control of discrete dynamic processes. The applicability of the proposed neural network is demonstrated on numerical examples.


Generalized 'Probe' Model For Arbitrary Dephasing Mechanisms, Supriyo Datta Nov 1991

Generalized 'Probe' Model For Arbitrary Dephasing Mechanisms, Supriyo Datta

Department of Electrical and Computer Engineering Technical Reports

It has been shown earlier that in the linear response regime, dephasing by point scatterers (within the self-consistent Born approximation) can be visualized in terms of point voltage probes attached to each space and energy coordinate (r,E). In this paper we derive a generalized linear response equation starting from the non-equilibrium Green function formalism that can be used to describe any dephasing process in any approximation. The dephasing is characterized by a 'reservoir function' which can be evaluated from the self-energy. The linear response equation can be visualized in terms of voltage probes but with individual probes connected to each …


Generalized 'Probe' Model For Arbitrary Dephasing Mechanisms, Supriyo Datta Nov 1991

Generalized 'Probe' Model For Arbitrary Dephasing Mechanisms, Supriyo Datta

Department of Electrical and Computer Engineering Technical Reports

It has been shown earlier that in the linear response regime, dephasing by point scatterers (within the self-consistent Born approximation) can be visualized in terms of point voltage probes attached to each space and energy coordinate (r,E). In this paper we derive a generalized linear response equation starting from the non-equilibrium Green function formalism that can be used to describe any dephasing process in any approximation. The dephasing is characterized by a ‘reservoir function’ which can be evaluated from the self-energy. The linear response equation can be visualized in terms of voltage probes but with individual probes connected to each …


Neural Networks For Constrained Optimization Problems, Walter E. Lillo, Stefen Hui, Stanislaw H. Zak Nov 1991

Neural Networks For Constrained Optimization Problems, Walter E. Lillo, Stefen Hui, Stanislaw H. Zak

Department of Electrical and Computer Engineering Technical Reports

This paper is concerned with utilizing neural networks and analog circuits to solve constrained optimization problems. A novel neural network architecture is proposed for solving a class of nonlinear programming problems. The proposed neural network, or more precisely a physically realizable approximation, is then used to solve minimum norm problems subject to linear constraints. Minimum norm problems have many applications in various areas, but we focus on their applications to the control of discrete dynamic processes. The applicability of the proposed neural network is demonstrated on numerical examples


Quadratic Spline Collocation Methods For Elliptic Partial Differential Equations, Christina C. Christara Nov 1991

Quadratic Spline Collocation Methods For Elliptic Partial Differential Equations, Christina C. Christara

Department of Computer Science Technical Reports

No abstract provided.


Population Trends For Indiana Counties, Cities, And Towns 1970–1990, Herpicc Nov 1991

Population Trends For Indiana Counties, Cities, And Towns 1970–1990, Herpicc

Indiana Local Technical Assistance Program (LTAP) Publications

This report presents tabulation and rankings that permit a direct comparison of population growth and population totals for city, town, and county units to assist officials in making amore comprehensive interpretation of the 1990 census figures.


Uniform System For Accident Reporting, Jorge A. Vanegas Nov 1991

Uniform System For Accident Reporting, Jorge A. Vanegas

Indiana Local Technical Assistance Program (LTAP) Publications

This report presents the results of Project 91-08 Task 5, Project 1, Part III: Uniform System for Accident Reporting.


Output Feedback Variable Structure Controllers And State Estimators For Uncertain Dynamic Systems, Stanislaw H. Zak, Stefen Hui Nov 1991

Output Feedback Variable Structure Controllers And State Estimators For Uncertain Dynamic Systems, Stanislaw H. Zak, Stefen Hui

Department of Electrical and Computer Engineering Technical Reports

In this paper we propose a new class of output feedback variable structure controllers and state estimators (observers) for uncertain dynamic systems with hounded uncertainties. No statistical information about the uncertain elements is assumed. A variable structure systems (VSS) approach together with the geometric approach to the analysis and synthesis of system zeros are employed in the synthesis of the proposed output feedback controllers and state estimators. The role of system zeros in the output feedback stabilization and state estimation, using the VSS approach, is discussed. Numerical examples included illustrate the feasibility of the proposed stabilization and state estimation schemes.


Minimizing Quotient Space Norms Using Penalty Functions, Stefen Hui, Walter E. Lillo, Stanislaw H. Zak Nov 1991

Minimizing Quotient Space Norms Using Penalty Functions, Stefen Hui, Walter E. Lillo, Stanislaw H. Zak

Department of Electrical and Computer Engineering Technical Reports

A penalty function method approach is proposed to solve the general problem of quotient space norms minimization. A new class of penalty functions is introduced which allows one to transform constrained optimization problems of quotient space norms minimization by unconstrained optimization problems. The sharp bound on the weight parameter is given for which constrained and unconstrained problems are equivalent. Also a computationally efficient bound on the weight parameter is given. Numerical examples and computer simulations illustrate the results obtained.


Electronic Skeletons: Modeling Skeletal Structures With Piecewise Algebraic Surfaces, Chanderjit L. Bajaj Oct 1991

Electronic Skeletons: Modeling Skeletal Structures With Piecewise Algebraic Surfaces, Chanderjit L. Bajaj

Department of Computer Science Technical Reports

No abstract provided.


Portable 3d Graphics In A Heterogeneous Distributed Environment, Vinod Anupam, Chanderjit L. Bajaj, Malcolm C. Fields, Andrew V. Royappa Oct 1991

Portable 3d Graphics In A Heterogeneous Distributed Environment, Vinod Anupam, Chanderjit L. Bajaj, Malcolm C. Fields, Andrew V. Royappa

Department of Computer Science Technical Reports

No abstract provided.


Computer Vision, Descriptive Geometry, And Classical Mechanics, Christoph M. Hoffmann Oct 1991

Computer Vision, Descriptive Geometry, And Classical Mechanics, Christoph M. Hoffmann

Department of Computer Science Technical Reports

No abstract provided.


The Shastra Distributed And Collaborative Geometric Design Environment, Vinod Anupam, Chanderjit L. Bajaj, Andrew V. Royappa Oct 1991

The Shastra Distributed And Collaborative Geometric Design Environment, Vinod Anupam, Chanderjit L. Bajaj, Andrew V. Royappa

Department of Computer Science Technical Reports

No abstract provided.


How To Compute Offsets Without Self-Intersection, Ching-Shoei Chiang, Christoph M. Hoffmann, Robert E. Lynch Oct 1991

How To Compute Offsets Without Self-Intersection, Ching-Shoei Chiang, Christoph M. Hoffmann, Robert E. Lynch

Department of Computer Science Technical Reports

No abstract provided.


On Solving Constrained Optimization Problems With Neural Networks : A Penalty Function Method Approach, Walter E. Lillo, Mei Heng Loh, Stefen Hui, Stanislaw H. Zak Oct 1991

On Solving Constrained Optimization Problems With Neural Networks : A Penalty Function Method Approach, Walter E. Lillo, Mei Heng Loh, Stefen Hui, Stanislaw H. Zak

Department of Electrical and Computer Engineering Technical Reports

This paper is concerned with utilizing analog circuits to solve various linear and nonlinear programming problems. The dynamics of these circuits are analyzed. Then, the previously proposed circuit implementations for solving optimization problems are examined. A new nonlinear programming network and its circuit implementation is then introduced which utilizes the nonlinearities to eliminate the problems encountered in previous circuit implementations.


Data Structures And Sparsity In A Digital Simulation Of An Hvdc Link, Mark Timothy Luehmann Oct 1991

Data Structures And Sparsity In A Digital Simulation Of An Hvdc Link, Mark Timothy Luehmann

Department of Electrical and Computer Engineering Technical Reports

An earlier algorithm for the detailed simulation of the High Voltage Direct Current (HVDC) link using the tensor approach was modified to improve the runtime speed. The runtime, approximately eleven percent that of the original algorithm, was improved by employing sparsity techniques, restructuring the state matrix, and condensing subroutines. The readability of the code was accomplished by a modular programming approach. This research was done for a two-terminal simulation, but could be expanded and modified to include multiterminal simulations.


Plant Growth Regulation: A Viable Concept In Aquatic Plant Management?, C. A. Lembi, M. D. Netherland Oct 1991

Plant Growth Regulation: A Viable Concept In Aquatic Plant Management?, C. A. Lembi, M. D. Netherland

IWRRC Technical Reports

No abstract provided.