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1995

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Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Acuta Enews December 1995, Vol. 24, No. 12 Dec 1995

Acuta Enews December 1995, Vol. 24, No. 12

ACUTA Newsletters

In This Issue

From the President

Cabling for the life of your network

Planning today

FRED fights fraud

From ACUTA Headquarters


Using Mathematica To Aid Simulation Analysis, Paul Savory Dec 1995

Using Mathematica To Aid Simulation Analysis, Paul Savory

Industrial and Management Systems Engineering Faculty Publications

As computer power has increased, so has the capability of software developers to write programs that assist people with time-consuming tasks. Mathematica is such a program. The objective of this paper is to demonstrate how Mathematica, a symbolic programming environment, can be used to aid simulation analysis. In addition to a general discussion of Mathematica’s uses, advantages, and disadvantages, several examples will be presented. The examples include using Mathematica for distribution fitting, queueing analysis, random number generation, and creating a surface plot for optimization.


A Psychological Perspective On Service Segmentation Models: The Significance Of Accounting For Consumers' Perceptions Of Waiting And Service, Ziv Carmon, J. George Shanthikumar, Tali F. Carmon Nov 1995

A Psychological Perspective On Service Segmentation Models: The Significance Of Accounting For Consumers' Perceptions Of Waiting And Service, Ziv Carmon, J. George Shanthikumar, Tali F. Carmon

Industrial and Manufacturing Engineering

We examine how service should be divided and scheduled when it can be provided in multiple separate segments. We analyze variants of this problem using a model with a conventional function describing the waiting cost, that is modified to account for some aspects of the psychological cost of waiting in line. We show that consideration of the psychological cost can result in prescriptions that are inconsistent with the common wisdom of queuing theorists derived according to the conventional approach (e.g., equal load assignments). More generally, our intention in this paper is to illustrate that aspects of the psychological cost ...


Acuta Enews November 1995, Vol. 24, No. 11 Nov 1995

Acuta Enews November 1995, Vol. 24, No. 11

ACUTA Newsletters

In This Issue

From the President

Voice Cellular Services at CMU

CTI for Universities Network 2000 at UTMB

From ACUTA Headquarters


Acuta Enews October 1995, Vol. 24, No. 10 Oct 1995

Acuta Enews October 1995, Vol. 24, No. 10

ACUTA Newsletters

In This Issue

From the President

Disaster Recovery: Part ll

PBX Call Processing Basics

Cal State lnstalls Intelligent Payphones

From ACUTA Headquarters


A Simulation Study Of Quality Index In Machine-Component Grouping, Hamid Seifoddini, Manocher Djassemi Sep 1995

A Simulation Study Of Quality Index In Machine-Component Grouping, Hamid Seifoddini, Manocher Djassemi

Industrial Technology and Packaging

Simulation modeling is employed to determine the effectiveness of quality index in screening machine-part matrices for the development of cellular manufacturing systems.


Traffic Control For Automated Highway Systems: A Conceptual Framework, H.-S. Jacob Tsao Sep 1995

Traffic Control For Automated Highway Systems: A Conceptual Framework, H.-S. Jacob Tsao

Faculty Publications

This paper proposes a conceptual framework for designing a traffic control scheme. It adopts a top-down approach to defining major design steps starting with high-level feature definition. With the desired features defined, the top-down approach then identifies and defines moves and related planning and movement functions that are required for supporting the desired features. The paper takes a systems view and identifies the safety issues regarding the movement coordination of the large number of vehicles on an Automated Highway System (AHS).


Acuta Enews September 1995, Vol. 24, No. 9 Sep 1995

Acuta Enews September 1995, Vol. 24, No. 9

ACUTA Newsletters

In This Issue

Awards presented at 24th Annual Conference

New Board of Directors looks forward to 1996

Board Report

Welcome New Members

Host needed for Winter Seminar

President's Message

Driving smart on the Info Highway


Acuta Enews August 1995, Vol. 24, No. 8 Aug 1995

Acuta Enews August 1995, Vol. 24, No. 8

ACUTA Newsletters

In This Issue

From the President

ISDN at MSU

Disaster Recovery

From ACUTA Headquarters: Emeritus Membership Status approved


Acuta Enews July 1995, Vol. 24, No. 7 Jul 1995

Acuta Enews July 1995, Vol. 24, No. 7

ACUTA Newsletters

In This Issue

Board report

President's message

Wiring today for tomorrow

Card technology

DC at a glance

From ACUTA Headquarters


Acuta Enews July 1995, Vol. 24, No. 7 Jul 1995

Acuta Enews July 1995, Vol. 24, No. 7

ACUTA Newsletters

In This Issue

Board report

Presidents message

Wiring today for tomorrow

Card technology

DC at a glance

From ACUTA Headquarters


Acuta Enews June 1995, Vol. 24, No. 6 Jun 1995

Acuta Enews June 1995, Vol. 24, No. 6

ACUTA Newsletters

In This Issue

Board report

President's message

Charles Co. Community College's telecommuting project

Brock's campus ID card

From ACUTA Headquarters


Acuta Enews May 1995, Vol. 24, No. 5 May 1995

Acuta Enews May 1995, Vol. 24, No. 5

ACUTA Newsletters

In This Issue

Board report

President's message

DC at a glance

Benchmarks for your telecom operation

From ACUTA Headquarters


Acuta Enews April 1995, Vol. 24, No. 4 Apr 1995

Acuta Enews April 1995, Vol. 24, No. 4

ACUTA Newsletters

In This Issue

Board Report

President's message

DC at a glance

Directory updates

From ACUTA Headquarters


Acuta Enews March 1995, Vol. 24, No. 3 Mar 1995

Acuta Enews March 1995, Vol. 24, No. 3

ACUTA Newsletters

In This Issue

Board report

President's message

ACUTA hires Administrative

DC at a glance

Info Superhighway grant

From ACUTA Headquarters


A Discrete Single Server Queue With Markovian Arrivals And Phase Type Group Services, Attahiru Sule Alfa, K. Laurie Dolhun, Srinivas R. Chakravarthy Mar 1995

A Discrete Single Server Queue With Markovian Arrivals And Phase Type Group Services, Attahiru Sule Alfa, K. Laurie Dolhun, Srinivas R. Chakravarthy

Industrial & Manufacturing Engineering Publications

We consider a single-server discrete queueing system in which arrivals occur according to a Markovian arrival process. Service is provided in groups of size no more than M customers. The service times are assumed to follow a discrete phase type distribution, whose representation may depend on the group size. Under a probabilistic service rule, which depends on the number of customers waiting in the queue, this system is studied as a Markov process. This type of queueing system is encountered in the operations of an automatic storage retrieval system. The steady-state probability vector is shown to be of (modified) matrix-geometric ...


Acuta Enews February 1995, Vol. 24, No. 2 Feb 1995

Acuta Enews February 1995, Vol. 24, No. 2

ACUTA Newsletters

In This Issue

Board Report

President's message

ACUTA hires Computer Services Administrator

Peer presentations at Maui

DC at a glance

From ACUTA Headquarters


Inexpensive Ultrahigh Vacuum Heatable/Coolable Xyz-Rotary Motion Sample Manipulator, Susan L. Peterson, Kirk H. Schulz, Carl A. Schulz, John M. Vohs Jan 1995

Inexpensive Ultrahigh Vacuum Heatable/Coolable Xyz-Rotary Motion Sample Manipulator, Susan L. Peterson, Kirk H. Schulz, Carl A. Schulz, John M. Vohs

Departmental Papers (CBE)

A simple design for a heatable, coolable, rotable sample manipulator, suitable for ultrahigh vacuum (UHV) applications, is described. Highlights of the design include using a combination power/thermocouple feedthrough for heating, cooling, and temperature measurement; and the use of primarily "off-the-shelf" components available from most UHV components vendors. The described manipulator is capable of sample cooling to ~100 K, sample heating to above 900 K, while maintaining 360o of rotary motion, ~1 in. of x and y motion, and 2 in. of z motion. The apparatus can be assembled for approximately $5500 (all new parts) and uses about 3 ...


Using Matlab To Illustrate The 'Phenomenon Of Aliasing', Sol Neeman, Ph.D. Jan 1995

Using Matlab To Illustrate The 'Phenomenon Of Aliasing', Sol Neeman, Ph.D.

Engineering Studies Faculty Publications and Creative Works

The phenomenon of aliasing is important when sampling analog signals. In cases where the signal is bandlimited, one can avoid aliasing by ensuring that the sampling rate is higher than the Nyquist rate . But in cases where the signal is not bandlimited , aliasing is unavoidable if the signal is not filtered before it is sampled. It is then crucial to understand the phenomenon in order to estimate the distortion generated when the signal is reconstructed from its samples. Using the software package MATLAB by MathWorks, Inc ., two examples are presented. The first is a pure sinusoid which is sampled at ...


Merits Of The Production Volume Based Similarity Coefficient In Machine Cell Formation, Hamid Seifoddini, Manocher Djassemi Jan 1995

Merits Of The Production Volume Based Similarity Coefficient In Machine Cell Formation, Hamid Seifoddini, Manocher Djassemi

Industrial Technology and Packaging

In this paper, two types of similarity coefficients are compared: (1) the Jaccard's coefficient and (2) the production volume based coefficient. Each is used to form a cellular manufacturing system whose performance will be used as a measure of effectiveness of the similarity coefficient. The sum of intercellular and intracellular material handling costs is used as a criterion for performance evaluation.


Linearly-Constrained Entropy Maximization Problem With Quadratic Costs And Its Applications To Transportation Planning Problems, Shu-Cherng Fang, Jacob Tsao Jan 1995

Linearly-Constrained Entropy Maximization Problem With Quadratic Costs And Its Applications To Transportation Planning Problems, Shu-Cherng Fang, Jacob Tsao

Faculty Publications

Many transportation problems can be formulated as a linearly-constrained convex programming problem whose objective function consists of entropy functions and other cost-related terms. In this paper, we propose an unconstrained convex programming dual approach to solving these problems. In particular, we focus on a class of linearly-constrained entropy maximization problem with quadratic cost, study its Lagrangian dual, and provide a globally convergent algorithm with a quadratic rate of convergence. The theory and algorithm can be readily applied to the trip distribution problem with quadratic cost and many other entropy-based formulations, including the conventional trip distribution problem with linear cost, the ...


A Staggered-Diamond Design For Automated/Manual-Hov Highway-To-Highway Interchanges And Constraints On Ahs Design For Accommodating Automated Highway Change, Jacob Tsao Jan 1995

A Staggered-Diamond Design For Automated/Manual-Hov Highway-To-Highway Interchanges And Constraints On Ahs Design For Accommodating Automated Highway Change, Jacob Tsao

Faculty Publications

This paper consists of two components. The First component addresses a key AHS infrastructure support issue—providing eight extra connector ramps, in addition to the eight existing highway-to-highway connector ramps for the conventional manual traffic, at a highway-to-highway interchange for accommodating continuous automated driving from one highway to the crossing highway. The proposed staggered-diamond design requires only four, instead of eight, separate structures and hence greatly increases the feasibility of AHS infrastructure support. However, the reduced infrastructure complexity at such interchanges could still constrain considerably the design, operation and evolution of AHS. This is the focus of the second component ...


Stage Definition For Ahs Deployment And An Ahs Evolutionary Scenario, Jacob Tsao Jan 1995

Stage Definition For Ahs Deployment And An Ahs Evolutionary Scenario, Jacob Tsao

Faculty Publications

Pros and cons of various mature Automated Highway Systems (AHS) have been a subject of intense study. However, such discussions are nothing but intellectual exercises unless the issue of how to evolve, in a planned and managed fashion, the current highway systems towards these mature AHS is also addressed. Since full functionality of a mature AHS cannot be realized suddenly, discrete functional steps must be identified and optimized. This paper defines an evolutionary stage towards a mature AHS as any discernible functional increment whose realization may encounter considerable difficulties requiring a significant amount of conscious effort to overcome. A good ...


Acuta Enews January 1995, Vol. 24, No. 1 Jan 1995

Acuta Enews January 1995, Vol. 24, No. 1

ACUTA Newsletters

In This Issue

Board Report

President's message

Telecom Resources Library Update

Developing a campus telecom plan

Precautions combat

phone fraud

DC at a glance


A “Robust” Convergent Visual Servoing System, D. Kim, A. A. Rizzi, G. D. Hager, Daniel E. Koditschek Jan 1995

A “Robust” Convergent Visual Servoing System, D. Kim, A. A. Rizzi, G. D. Hager, Daniel E. Koditschek

Departmental Papers (ESE)

This paper describes a simple visual servoing control algorithm capable of robustly positioning a three degree of freedom end effector based only on information from a stereo vision system. The proposed control algorithm does not require estimates of the gripper’s spatial position, a significant source of calibration sensitivity. The controller is completely immune to positional camera calibration errors, and we demonstrate robustness to orientation miscalibration through a series of simulations and experiments.

For more information: Kod*Lab


The Geometry Of A Robot Programming Language, Daniel E. Koditschek Jan 1995

The Geometry Of A Robot Programming Language, Daniel E. Koditschek

Departmental Papers (ESE)

This paper explores the problem of building robot navigation plans via scalar valued functions in the face of incomplete information about the configuration space such as might be available from onboard sensors. It seems as though syntactical aspects of navigation function construction may play an important role. This problem provides an important concrete instance of the need for intelligent control.

For more information: Kod*Lab


Issues In Developing An Undergraduate Simulation Course, Paul Savory Jan 1995

Issues In Developing An Undergraduate Simulation Course, Paul Savory

Industrial and Management Systems Engineering Faculty Publications

Experience in developing an undergraduate simulation course is described. The course introduces the philosophies, principles, and methodologies for discrete-event simulation modeling. Strategy in choosing the course simulation software is discussed, plus important areas of teaching emphasis are highlighted.


Simulation Project Characteristics In Industrial Settings, Paul Savory Jan 1995

Simulation Project Characteristics In Industrial Settings, Paul Savory

Industrial and Management Systems Engineering Faculty Publications

In a survey of practitioners of discrete-event simulation from industry and research institutes who "build models for money," we asked about project goals, user backgrounds and training, organizational types and activities, software and hardware choices, modeling team composition, and effort allocation within a modeling project. We found that (1) only about half of the practitioners have three or more years experience, (2) many academics feel strongly affiliated with their industry clients rather than with their university employers, (3) shop-floor supervisors rarely lead simulation projects, even though their knowledge of the system may be unparalleled, (4)simulation models are generally described ...


Variance And Uncertainty Measures Of Population Diversity Dynamics, Mark A. Bedau, Martin Zwick, Alan Bahm Jan 1995

Variance And Uncertainty Measures Of Population Diversity Dynamics, Mark A. Bedau, Martin Zwick, Alan Bahm

Systems Science Faculty Publications and Presentations

We define variance and uncertainty measures of population diversity. Both measures have precise decompositions that we can exploit in analysis of evolutionary dynamics. We discuss how these measures are related and how they can be observed in artificial and natural evolving systems.