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1991

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

Acuta Enews December 1991, Vol. 20, No. 12 Dec 1991

Acuta Enews December 1991, Vol. 20, No. 12

ACUTA Newsletters

In This Issue

10-XXX gives occasion for fraud

President's Message

YaleNET, a variety of services

Think ahead to prevent fraud

MOREnet links 12 campuses

Positions available


Material Handling In A Flexible Manufacturing Systems Processing Part Families, Paul Savory, Gerald Mackulak, Jeff Cochran Dec 1991

Material Handling In A Flexible Manufacturing Systems Processing Part Families, Paul Savory, Gerald Mackulak, Jeff Cochran

Industrial and Management Systems Engineering Faculty Publications

The objective of this simulation study is to analyze the system performance of a six machine flexible manufacturing system cell in which a material handling system is to be incorporated. The analysis focuses on determining the production potential of the cell by grouping common parts into "families". To accomplish this, computer simulation models are developed using the SIMAN simulation language.

Initially the manufacturing cell is modeled with no material handling system to get an upper bound estimate of production output. We next explore the impact that an automatic guided vehicle (AGV) has on system performance of the manufacturing system cell ...


Acuta Enews November 1991, Vol. 20, No. 11 Nov 1991

Acuta Enews November 1991, Vol. 20, No. 11

ACUTA Newsletters

In This Issue

President's message

Distance learning in Maine

FCC backs phone-line video

Pooling purchasing power

Area code shortage

Positions available


Can Dumb Feedback Produce Intelligent Machines?, Daniel E. Koditschek Nov 1991

Can Dumb Feedback Produce Intelligent Machines?, Daniel E. Koditschek

Departmental Papers (ESE)

An intelligent machine is autonomous. An autonomous machine can operate successfully in a diversity of situations without resort to intervention by “higher level” processes, for example, humans. Physical machines are ultimately force or torque controlled dynamical systems: the specification of input torques, whether via syntactic prescriptions or feedback controllers, results in certain classes of vector fields. Control procedures whose resulting vector fields have globally attracting goal states may properly be said to evince autonomous behavior. In this light it makes sense to “program” robots using the language of dynamical systems via feedback. This talk will review various procedures developed within ...


Acuta Enews October 1991, Vol. 20, No. 10 Oct 1991

Acuta Enews October 1991, Vol. 20, No. 10

ACUTA Newsletters

In This Issue

President's message

Wireless alternative to cable

AT&T donates computers

ACUTA budget for 1991-92

Voice messaging is "hit"

Publications Editor profiled


Acuta Enews September 1991, Vol. 20, No. 9 Sep 1991

Acuta Enews September 1991, Vol. 20, No. 9

ACUTA Newsletters

In This Issue

0+ fraud alive and well

AOS rules don't move north

Call screening not mandated

Workshop in Atlanta

Five Ps paying off

Business Manager profile


Acuta Enews August 1991, Vol. 20, No. 8 Aug 1991

Acuta Enews August 1991, Vol. 20, No. 8

ACUTA Newsletters

In This Issue

President's column

Business meeting

Regional meetings

User groups

Director's column

Workshop in Atlanta


Tardiness Heuristic For Scheduling Flexible Manufacturing Systems, Ali S. Kiran, Sema E. Alptekin, A. Celal Kaplan Jul 1991

Tardiness Heuristic For Scheduling Flexible Manufacturing Systems, Ali S. Kiran, Sema E. Alptekin, A. Celal Kaplan

Industrial and Manufacturing Engineering

This paper evaluates the tardiness performance of a sampling-based adaptive heuristic in a dynamic manufacturing environment. A test bed, following a real world manufacturing system, has been developed. The proposed algorithm has been implemented in this simulated environment. After fine tuning the algorithm, it has been tested in various shop conditions. The results of these simulation studies are summarized.


Acuta Enews July 1991, Vol. 20, No. 7 Jul 1991

Acuta Enews July 1991, Vol. 20, No. 7

ACUTA Newsletters

In This Issue

ACUTA Forum

Unblocking 1-0-XXX

President's farewell

Affordable fiber to the desk

Value of utility bill audits

$60 million math/science network


Preliminary Experiments In Spatial Robot Juggling, A. A. Rizzi, Daniel E. Koditschek Jun 1991

Preliminary Experiments In Spatial Robot Juggling, A. A. Rizzi, Daniel E. Koditschek

Departmental Papers (ESE)

In a continuing program of research in robotic control of intermittent dynamical tasks, we have constructed a three degree of freedom robot capable of juggling a ball falling freely in the earth’s gravitational field. This work is a direct extension of that previously reported in [7, 3, 5, 4]. The present paper offers a comprehensive description of the new experimental apparatus and a brief account of the more general kinematic, dynamical, and computational understanding of the previous work that underlie the operation of this new machine.

For more information: Kod*Lab


Acuta Enews June 1991, Vol. 20, No. 6 Jun 1991

Acuta Enews June 1991, Vol. 20, No. 6

ACUTA Newsletters

In This Issue

Panel to focus on fraud

Interactive video bandwidth

Aggregator requirements

Telex can still be useful

Penn State still pioneering

Positions availabe


Acuta Enews May 1991, Vol. 20, No. 5 May 1991

Acuta Enews May 1991, Vol. 20, No. 5

ACUTA Newsletters

In This Issue

Golf outing set for St. Louis

Network ties islands together

Reorganization at Chicago

Recycling phone books

Party Line

Call for nominations


Acuta Enews April 1991, Vol. 20, No. 4 Apr 1991

Acuta Enews April 1991, Vol. 20, No. 4

ACUTA Newsletters

In This Issue

ACUTA Forum

Travel cards save money

Reorganization at Chicago

Regional Directors elected

Enchancing campus safety

Drew's Knowledge Initiative


From Suburban Railways To Regional Rail Systems, Vukan R. Vuchic Apr 1991

From Suburban Railways To Regional Rail Systems, Vukan R. Vuchic

Departmental Papers (ESE)

In recent decades rail systems serving cities and their suburbs have undergone a major expansion and evolution. As one of the oldest modes of mechanized urban transportation, suburban or commuter railways were specialized services for commuters operated by railway companies which primarily operated long-distance passenger and freight transport. Today most of these railways have grown into regional rail systems - regular transit services which meet the need for high quality multicentered transportation throughout growing metropolitan areas.


Robot Assembly: Another Source Of Nonholonomic Control Problems, Daniel E. Koditschek Mar 1991

Robot Assembly: Another Source Of Nonholonomic Control Problems, Daniel E. Koditschek

Departmental Papers (ESE)

Assembly problems require that a robot with a few actuated degrees of freedom manipulate an environment with a greater number of unactuated degrees of freedom. Since the dynamical coupling between degrees of freedom in this setting is a function of their relative configuration, the motion of such systems is subject to constraints that preclude smooth feedback stabilization. This paper explores the extent to which assembly planning and control may be effected by recourse to some other methodical means of generating stabilizing feedback controllers. A partial solution is offered for a very simple assembly problem involving an intermittent dynamical environment.

For ...


Acuta Enews March 1991, Vol. 20, No. 3 Mar 1991

Acuta Enews March 1991, Vol. 20, No. 3

ACUTA Newsletters

In This Issue

Telecom graduate study

Greenville Tech outgrows PBX

World-calling discounts

Call for Presentations

Update on Hawaii

Listing of exhibitors


Toward A Science Of Robot Planning And Control, Daniel E. Koditschek Feb 1991

Toward A Science Of Robot Planning And Control, Daniel E. Koditschek

Departmental Papers (ESE)

Programming machines to operate flexibly and autonomously in the physical world seems to require a sophisticated representation that encodes simultaneously the nature of a task, the nature of the environment within which the task is to be performed, and the nature of the robot’s capabilities with respect to both. We seek a scientific methodology of robot task encoding that encompasses the desired behavioral goals and environmental conditions as well. The methodology must balance the need for flexible expression of abstract human goals against the necessity of a eliciting a predictable response from the commanded machine. This talk focuses on ...


Acuta Enews February 1991, Vol. 20, No. 2 Feb 1991

Acuta Enews February 1991, Vol. 20, No. 2

ACUTA Newsletters

In This Issue

ACUTA gains new tax status

Stopping a runaway dialer

Just what is an engineer?

FCC ruling awaited

Party Line

In-house accounting


Stabilizing Feedback Controllers For Robotic Assembly Problems, Daniel E. Koditschek Feb 1991

Stabilizing Feedback Controllers For Robotic Assembly Problems, Daniel E. Koditschek

Departmental Papers (ESE)

Assembly problems require that a robot with a few actuated degrees of freedom manipulate an environment with a greater number of unactuated degrees of freedom. Since the dynamical coupling between degrees of freedom in this setting is a function of their relative configuration, the motion of such systems is subject to constraints that preclude smooth feedback stabilization. In other words, in contrast to purely geometric motion planning problems, assembly planning cannot be carried out within the limits of traditional control theory. This paper explores the extent to which assembly planning and control may be effected by recourse to some other ...


Prospects For Competitiveness Of Urban Public Transport, Vukan R. Vuchic Feb 1991

Prospects For Competitiveness Of Urban Public Transport, Vukan R. Vuchic

Departmental Papers (ESE)

From the introductory paragraphs:


"If we observe a herd of sheep who want to pass through a gate to a green pasture, we see them pushing so hard that they get stuck at the gate and pass through it only very torturously and with great delay. It is obvious that if they would not push, but pass one or two at a time, the sheep would get through the gate much faster and more easily. The problem is, we conclude, that the sheep are animals with a rather low level of intelligence. If a creature from Outer Space observes one ...


The Production Data-Based Similarity Coefficient Versus Jaccard's Similarity Coefficient, Hamid Seifoddini, Manocher Djassemi Jan 1991

The Production Data-Based Similarity Coefficient Versus Jaccard's Similarity Coefficient, Hamid Seifoddini, Manocher Djassemi

Industrial Technology and Packaging

This paper compares the performance of Jaccard's similarity coefficient with the production data-based similarity coefficient. A number of machine-component charts taken from the literature or randomly generated are used to form machine-component groups. Then, the sum of intercellular and intracellular material handling costs for each machine-component group is calculated and used as a basis for performance evaluation of the two similarity coefficients.


Acuta Enews January 1991, Vol. 20, No. 1 Jan 1991

Acuta Enews January 1991, Vol. 20, No. 1

ACUTA Newsletters

In This Issue

ECCI founder honored

Pocket phone test at UGA

Giving pays off for Emory

Digitizing X-rays

Illicall lists rates

Party Line


Theory And Practice Of Metro Network Design, Vukan R. Vuchic, Antonio Musso Jan 1991

Theory And Practice Of Metro Network Design, Vukan R. Vuchic, Antonio Musso

Departmental Papers (ESE)

Most transit networks are designed empirically. For bus net­works this process 1s often satisfactory because bus routes and networks are very dependent on local conditions, and they can be easily modified, allowing easy corrections of problems which line design may cause in operations. However, with transit systems which have extensive infrastructure, most typically metro lines and networks, corrections are ex­tremely difficult to make. Develop­ment of an optimal network and avoidance of design features which result in operational pro­blems are therefore of great im­portance. Yet, the experiences from the design and operation of such large older ...


An Empirical Analysis Of Backpropagation Error Surface Initiation For Injection Molding Process Control, Alice E. Smith, Elaine R. Raterman, Cihan H. Dagli Jan 1991

An Empirical Analysis Of Backpropagation Error Surface Initiation For Injection Molding Process Control, Alice E. Smith, Elaine R. Raterman, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

Backpropagation neural networks are trained by adjusting initially random interconnecting weights according to the steepest local error surface gradient. The authors examine the practical implications of the arbitrary starting point on the error landscape of the ensuing trained network. The effects on network convergence and performance are tested empirically, varying parameters such as network size, training rate, transfer function and data representation. The data used are live process control data from an injection molding plant


A Technological Development Model For Strategy Formation, Halvard E. Nystrom Jan 1991

A Technological Development Model For Strategy Formation, Halvard E. Nystrom

Engineering Management and Systems Engineering Faculty Research & Creative Works

Summary form only given, as follows. The author presents a technological development model for product and company development based on a distinction between explicit and implicit technologies. Implicit technologies are evolving technologies while explicit technologies are established technologies. Based on empirical data from Swedish companies, a number of strategic dimensions are discussed such as network interaction and combining knowledge from various sources. These concepts are then used to present an integrated model of strategy formation and product and company development. It is argued that this view of technological development facilitates the understanding and analysis of innovation and entrepreneurship in highly ...


Integrated Neural Network And Machine Vision Approach For Intelligent State Identification, Cihan H. Dagli, Timothy Andrew Bauer Jan 1991

Integrated Neural Network And Machine Vision Approach For Intelligent State Identification, Cihan H. Dagli, Timothy Andrew Bauer

Engineering Management and Systems Engineering Faculty Research & Creative Works

An interfacing of neural networks (NNs) and machine vision to provide the next state of a system given an image of the present state of the system is presented. This interfacing is applied to a loading operation. First, a NN is trained for part recognition under conditions of rotation, location, object distortion, and background noise given an image of the part. Then, a second NN, given the output of the first NN and an image of a pallet being loaded, is trained for optimal part loading onto the pallet under conditions of noise in the image. The paradigm used is ...