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1992

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Articles 1 - 30 of 77

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

Simulation Study For The Effect Of Dependencies In Queueing Systems, Yitao Bai Dec 1992

Simulation Study For The Effect Of Dependencies In Queueing Systems, Yitao Bai

Theses

Few theoretical results have been obtained in the literature for the effects of dependencies between random variables on the performance of queueing systems. This thesis aims at investigating this issue via simulation. Several dependencies are studied in detail, including dependencies between interarrival times, between interarrival time and service time, between service times and dependencies between different stages in networks of queues. We define several classes of dependent random variables and study their correlation coefficients, then we apply them to single and multiple station service systems. Comparisons with the independent case, for which the explicit form solution are available, are made ...


Acuta Enews December 1992, Vol. 21, No. 12 Dec 1992

Acuta Enews December 1992, Vol. 21, No. 12

ACUTA Newsletters

In This Issue

Regulatory update

President's column

Dual routing protects Duke

Talking clock "tells" time

Seminar ratings

Director's column


The Role Of Automated Guided Transit Systems In Urban Transportation, Vukan R. Vuchic Dec 1992

The Role Of Automated Guided Transit Systems In Urban Transportation, Vukan R. Vuchic

Departmental Papers (ESE)

New transportation systems have always attracted attention of both transportation experts and general public: the first railway in England, first automobile and streetcar in Germany, first airplane in the United States - all of these inventions attracted excitement, curiosity, enthusiasm - and skepticism.

With time, many inventions fulfilled or exceeded expectations: they have been developed into major transportation systems which influence our lives and shape our cities. However, an even greater number of inventions never developed into viable systems; incorrectly conceived, they never matured into operating systems.

For the last 20-30 years there have been many inventions of automated transit systems. They ...


An Integrated Simulation Model Development Environment For Slam Ii Using Object-Oriented Paradigm, Rizvan Erol Dec 1992

An Integrated Simulation Model Development Environment For Slam Ii Using Object-Oriented Paradigm, Rizvan Erol

Master's Theses

An integrated simulation model development environment was implemented to assist the modeler by automating certain activities of simulation modeling. The system included interactive model definition, experimental design, automatic simulation program generation in SLAM II. Object-oriented paradigm at software development stage was extensively used to conceptualize the structure, and rules of the SLAM II language in order to generate efficient, and modular program code. The present system targeted modeling of various probabilistic inventory control system problems. The remarkable advantages of the system were rapid model development time, and achieving reliable program code without requiring any knowledge in SLAM II. Object-oriented programming ...


Acuta Enews November 1992, Vol. 21, No. 11 Nov 1992

Acuta Enews November 1992, Vol. 21, No. 11

ACUTA Newsletters

In This Issue

Interchangeable NPA, NNX

President's Message

Permanent 800 numbers

Industry/ Regulatory updates

Making voice mail effective

The fax-on-demand solution


Artificial Neural Networks For Robotics Coordinate Transformation, Stephen Aylor, Luis Rabelo, Sema E. Alptekin Oct 1992

Artificial Neural Networks For Robotics Coordinate Transformation, Stephen Aylor, Luis Rabelo, Sema E. Alptekin

Industrial and Manufacturing Engineering

Artificial neural networks with such characteristics as learning, graceful degradation, and speed inherent to parallel distributed architectures might provide a flexible and cost solution to the real time control of robotics systems. In this investigation artificial neural networks are presented for the coordinate transformation mapping of a two-axis robot modeled with Fischertechnik physical modeling components. The results indicate that artificial neural systems could be utilized for practical situations and that extended research in these neural structures could provide adaptive architectures for dynamic robotics control.


Acuta Enews October 1992, Vol. 21, No. 10 Oct 1992

Acuta Enews October 1992, Vol. 21, No. 10

ACUTA Newsletters

In This Issue

CMSU testing VISIT

President's message

A telecom intern's report

Annual ACUTA budget

Answers from "Regional Feud"

Membership Director's report


Packet Routing In Networks With Long Wires, Ronald I. Greenberg, H.-C. Oh Oct 1992

Packet Routing In Networks With Long Wires, Ronald I. Greenberg, H.-C. Oh

Computer Science: Faculty Publications and Other Works

In this paper, we examine the packet routing problem for networks with wires of differing length. We consider this problem in a network independent context, in which routing time is expressed in terms of “congestion” and “dilation” measures for a set of packet paths. We give, for any constant ε > 0, a randomized on-line algorithm for routing any set of N packets in O((Clg^ε(Nd)+Dlg(Nd))/lglg(Nd)) time, where C is the maximum congestion and D is the length of the longest path, both taking wire delays into account, and d is the longest path in ...


Automatic Recognition Of Tool Wear On A Face Mill Using A Mechanistic Modeling Approach, Daniel Waldorf, Shiv G. Kapoor, Richard E. Devor Sep 1992

Automatic Recognition Of Tool Wear On A Face Mill Using A Mechanistic Modeling Approach, Daniel Waldorf, Shiv G. Kapoor, Richard E. Devor

Industrial and Manufacturing Engineering

A strategy is developed for identifying cutting tool wear on a face mill by automatically recognizing wear patterns in the cutting force signal. The strategy uses a mechanistic model development to predict forces on a lathe under conditions of wear and extends that model to account for the multiple inserts of a face mill. The extended wear model is then verified through experimentation over the life of the inserts. The predicted force signals are employed to train linear discriminant functions to identify the wear state of the process in a manner suitable for on-line application.


Acuta Enews Septmber 1992, Vol. 21, No. 9 Sep 1992

Acuta Enews Septmber 1992, Vol. 21, No. 9

ACUTA Newsletters

In This Issue

Merging technologies to compete

President's column

Award, election winners

Innovation spurs productivity

Conference evaluations

Welcome to new members


Ice Skate Blade Alignment Mechanism, Leon E. Girard, Patrick E. Patterson Aug 1992

Ice Skate Blade Alignment Mechanism, Leon E. Girard, Patrick E. Patterson

Iowa State University Patents

A blade alignment mechanism for an ice skate including a clamp for releasably securing the blade assembly to a skating boot in a trial position. The clamp includes a first member secured to the boot at a point remote from the screw apertures in the front or rear flanges, and a second member attached to the first member and disposed to contact one of the flanges to hold it in a trial position. The second member includes an enlarged adjustment opening that allows side-to-side and fore-and-aft adjustment of the second member with respect to the first member. The first and ...


Acuta Enews August 1992, Vol. 21, No. 8 Aug 1992

Acuta Enews August 1992, Vol. 21, No. 8

ACUTA Newsletters

In This Issue

FCC gives nod to touch-tone video

President's column

West Chester starting student resale

Security at Yale

ACUTA Calender

Phone taps snare hackers


Acuta Enews July 1992, Vol. 21, No. 7 Jul 1992

Acuta Enews July 1992, Vol. 21, No. 7

ACUTA Newsletters

In This Issue

President's column

Two Region Directors elected

Party Line

Northeast Region meeting


Acuta Enews June 1992, Vol. 21, No. 6 Jun 1992

Acuta Enews June 1992, Vol. 21, No. 6

ACUTA Newsletters

In This Issue

Connectivity, Database Center

President's column

WISE participants

Billed party preference

Keene State gets "slammed"

New Membership Director


Introduction To Intellisim 1.0, Paul Savory Jun 1992

Introduction To Intellisim 1.0, Paul Savory

Industrial and Management Systems Engineering Faculty Publications

IntelliSIM is a prototype for a new generation of knowledge-based simulation tool that has been developed by the Systems Simulation Laboratory at Arizona State University. This tool is a computer environment that allows non-simulation trained modelers to predict the performance of a manufacturing system for which the necessary data is available. The system provides predictive data on such items as throughput time, queue levels, equipment utilization, reactions to machine failures, etc. With IntelliSIM, the benefits of discrete-event simulation can be exploited without requiring the high level of expertise necessary to successfully conduct a sound simulation study. The approach offered with ...


Hierarchical Feedback Controllers For Robotic Assembly, Daniel E. Koditschek May 1992

Hierarchical Feedback Controllers For Robotic Assembly, Daniel E. Koditschek

Departmental Papers (ESE)

How is navigating a unicycle amidst obstacles like manipulating beads on a necklace? This paper addresses that question by introducing a simple control system that appears to offer a common dynamical model for both situations. System (1) consists of a trivially controlled set of “steering” state variables and an additional set of “body” state variables that can be “driven” in a direction determined by the steering variables. The task will be to bring the state of the system to some desired equilibrium using feedback. A defect in the “steered” vector field precludes the possibility of stabilization via a single continuous ...


Acuta Enews May 1992, Vol. 21, No. 5 May 1992

Acuta Enews May 1992, Vol. 21, No. 5

ACUTA Newsletters

In This Issue

Nominations for officers sought

President's column

AT&T opens development site

Northeast regional meeting


Deterministic Approximations To Co-Production Problems With Service Constraints And Random Yields, Gabriel R. Bitran, Thin Yin Leong May 1992

Deterministic Approximations To Co-Production Problems With Service Constraints And Random Yields, Gabriel R. Bitran, Thin Yin Leong

Research Collection School Of Information Systems

Production planning problems where multiple item categories are produced simultaneously are examined. The items have random yields and are used to satisfy the demands of many products. These products have specification requirements that overlap. An item originally targeted to satisfy the demand of one product may be used to satisfy the demand of other products when it conforms to their specifications. Customers' demand must be satisfied from inventory. The problem is formulated with service constraints and a near-optimal solution is provided to the problem with a fixed planning horizon. Simple heuristics are proposed for the problem solved with a rolling ...


Acuta Enews April 1992, Vol. 21, No. 4 Apr 1992

Acuta Enews April 1992, Vol. 21, No. 4

ACUTA Newsletters

In This Issue

Call for Award nominations

President's column

Managing Telecom review

Creighton opens access, ends fraud

Membership Service Coordinator

San Francisco registration form


Computational Simulation Of Flow Through Elbows In The Approach Piping Systems To A Headbox, Kasinathan Ramanathan Apr 1992

Computational Simulation Of Flow Through Elbows In The Approach Piping Systems To A Headbox, Kasinathan Ramanathan

Master's Theses

The successful operation of the wet end in a paper machine is highly dependent on the approach piping system. Sheet basis weight stability and ease of making wet end adjustments are greatly impaired by improperly designed approach piping systems. Most problems in headbox approach piping occur when the flow splits, combines, and passes through elbows.

Elbows create cross flows, flow separation, and eddies, and play an important role in the uniform and stable delivery of the pulp into the headbox. The effect due to an elbow lasts for a considerable distance downstream of the elbow and is severe when two ...


The Indentation Of Foam Pattern Surfaces By Coordinate Measuring Machine Probes, Sanjay Nenawati Apr 1992

The Indentation Of Foam Pattern Surfaces By Coordinate Measuring Machine Probes, Sanjay Nenawati

Master's Theses

When coordinate measuring machines are used to measure the complex shapes of foam patterns, the spherical probe tips indent into the soft surface of the pattern. Such indentation represents a measurement error since the indicated dimension will not be the same as the actual dimension. To determine the magnitude of error, the depth of probe tip indentation into PMMA and EPS foam surface (i.e., elastic indentation) was measured as a function of time, applied load, and foam density. The residual indentation after the removal of the load (i.e., plastic indentation) was also studied.

The depth of elastic indentation ...


Acuta Enews February 1992, Vol. 21, No. 2 Feb 1992

Acuta Enews February 1992, Vol. 21, No. 2

ACUTA Newsletters

In This Issue

Call for RD Nominations

President's column

Workshop announcement

Alabama college takes case to PSC

Party Line

Rating to Tucson seminars


On Capacity Modeling For Production Planning With Alternative Machine Types, Robert C. Leachman, Tali F. Carmon Jan 1992

On Capacity Modeling For Production Planning With Alternative Machine Types, Robert C. Leachman, Tali F. Carmon

Industrial and Manufacturing Engineering

Analyzing the capacity of production facilities in which manufacturing operations may be performed by alternative machine types presents a seemingly complicated task. In typical enterprise-level production planning models, capacity limitations of alternative machine types are approximated in terms of some single artificial capacitated resource. In this paper we propose procedures for generating compact models that accurately characterize capacity limitations of alternative machine types. Assuming that processing times among alternative machine types are identical or proportional across operations they can perform, capacity limitations of the alternative machine types can be precisely expressed using a formulation that is typically not much larger ...


Acuta Enews January 1992, Vol. 21, No. 1 Jan 1992

Acuta Enews January 1992, Vol. 21, No. 1

ACUTA Newsletters

In This Issue

Are you ready for the ADA?

Alabama regulators take aim at campus phone services

NATA asks that blocking services be mandatory for LECS

Distance education programs, technology continue to mature

Message From The President

Merging technologies may mean crossfire of competition

Monographs: opportunity to share knowledge

ADA to have far-reaching effect on telecommunications

Party Line

Annenberg announces distance learning grants

Marketplace Update


Three-Dimensional Incompressible Flow Calculations With Maccormack's Method, Robert S. Bernard, Michael L. Schneider Jan 1992

Three-Dimensional Incompressible Flow Calculations With Maccormack's Method, Robert S. Bernard, Michael L. Schneider

US Army Research

MAC3D is a finite-volume computer code that uses MacCormack's method to calculate three-dimensional incompressible flow on staggered Marker-and-Cell grids. The code accepts nonuniform, nonorthogonal grids for any curvilinear domain that can be mapped onto a single rectangular block. It is applicable for free-surface flow at low Froude number, and for confined flow in general. Computed results from MAC3D are presented for laminar flow in channels with internal obstacles and curved boundaries.


Improved Thermal Predictions In Ce-Qual-W2, Raymond S. Chapman, Thomas M. Cole Jan 1992

Improved Thermal Predictions In Ce-Qual-W2, Raymond S. Chapman, Thomas M. Cole

US Army Research

Recent modifications to the transport scheme within the two-dimensional hydrodynamic and water quality model CEQUAL- W2 have resulted in a significant improvement in the prediction of temperature distributions by reducing numerical diffusion. These changes allow for a more accurate description of wind effects in the model. This paper briefly describes the modifications to CE-QUAL-W2 and presents results of two simulations both with and without the improvements to the transport algorithm.


Hydrodynamics For Water Quality Models, Mark Dortch, Billy Johnson Jan 1992

Hydrodynamics For Water Quality Models, Mark Dortch, Billy Johnson

US Army Research

During the past decade, the US Army Engineer Waterways Experiment station (WES) has developed and applied a variety of numerical water quality models for surface waters. In most cases, the transport terms of these models have been computed using output from numerical hydrodynamic models. This paper summarizes the experience of linking water quality models to hydrodynamic models and examines the need for such linkages.


Verification Techniques Used In Modeling Charleston Harbor, South Carolina, Samuel B. Heltzel Jan 1992

Verification Techniques Used In Modeling Charleston Harbor, South Carolina, Samuel B. Heltzel

US Army Research

Verification to field data provides a means to assess a model's ability to reproduce behavior of the natural system being modeled. Often neither time nor funds are available to collect extensive sets of field data, and alternate techniques are required. This study used the results of a laterally averaged model to provide limited verification for a two-dimensional depthaveraged hydrodynamic and sediment model.

This numerical model investigation used the US Army Corps of Engineers TABS-MD numerical modeling system for open channel flow and sedimentation. Boundary conditions and a verification data set were obtained from the laterally averaged numerical model FIne-Grained ...


Release Alternatives On A 3-D Salinity Simulation, Bernard B. Hsieh Jan 1992

Release Alternatives On A 3-D Salinity Simulation, Bernard B. Hsieh

US Army Research

Hydraulic structures such as darns, locks or diversion gates, in the upstream or tributary of an estuary system can control necessary freshwater discharge to meet downstream water quality standards. One of the most significant purposes of these structures is maintaining target salinity to satisfy the environment concerns, such as fishery spawning in the high-flow season and drinking water criteria in the low-flow period. In order to evaluate possible alternative regulations for the reservoir operation, a reliable three-dimensional (3-D) hydrodynamic model is required as a management tool to simulate the impact of salinity variations due to release policy changes. This paper ...


Flow Impingement Velocities, Snake River, Wyoming, Stephen T. Maynord Jan 1992

Flow Impingement Velocities, Snake River, Wyoming, Stephen T. Maynord

US Army Research

Flow impingement, which occurs when approach channels direct flow into a bank line at large acute angles, results in flow concentration along bank lines, which creates large forces on bank material or bank protection. As part of studies conducted to determine the required riprap size for impinged flow, velocities were measured on the Snake River near Jackson, Wyoming. High velocities and steep water-surface slopes were observed at each impingement site.