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Articles 1 - 14 of 14

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

Haccp As A Regulatory Innovation To Improve Food Safety In The Meat Industry, Laurian J. Unnevehr, Helen H. Jensen Feb 1996

Haccp As A Regulatory Innovation To Improve Food Safety In The Meat Industry, Laurian J. Unnevehr, Helen H. Jensen

CARD Working Papers

Industrial engineers in the food-processing industry have developed the Halyard Analysis Critical Control Point (HACCP) system as a preventive approach to ensuring the safety of meat and poultry products. This paper discusses both the origins of HACCP as an engineering concept and the economics of HACCP as a regulatory tool. The authors contend that the economics literature has not adequately explored the benefits from prevention, particularly when the costs of hazard detection are high and the exact benefits of a particular standard are uncertain but potentially large.


Solving Multi Depot Vehicle Routing Problem For Iowa Recycled Paper By Tabu Search Heuristic, Supachai Pathumnakul Jan 1996

Solving Multi Depot Vehicle Routing Problem For Iowa Recycled Paper By Tabu Search Heuristic, Supachai Pathumnakul

Retrospective Theses and Dissertations

No abstract provided.


Field Study Of Energy Savings In Manufacturing Facilities , Karen Louise Smith Jan 1996

Field Study Of Energy Savings In Manufacturing Facilities , Karen Louise Smith

Retrospective Theses and Dissertations

Many energy conservation projects have been implemented, and a great deal of investment will be made in the future. Yet little data are available showing the actual energy savings achieved. This project evaluated energy conservation projects related to compressors, boilers, and reducing heating and cooling loads, through monitoring at six industrial facilities and in on-campus facilities;As predicted by theory, lowering the exit pressure from the air compressor resulted in lower power consumption for positive displacement compressors. For the screw compressor studied, the isentropic compression model does a good job of predicting the savings due to a decreased compressor exit ...


Variants Of Asymptotic Extremes , Chih-Yao Liu Jan 1996

Variants Of Asymptotic Extremes , Chih-Yao Liu

Retrospective Theses and Dissertations

In this dissertation, we study two variants of asymptotic extremes, with the first exploiting Daniels' "covering circle", and the second exploiting a certain variant of it. The first topic concerns geometric tolerancing, for gauging the quality of either the assembly of two manufactured planar parts, or the conformance of a single such planar part to its jig. Minimax point-to-point discrepancy and the corresponding plate misalignment are studied asymptotically in n, using the notion of random covering circle, in the case of circular normal and circular uniform error. The second topic concerns certain asymptotic distributions related to game values, for k ...


Tqm Comes To The Carter Company: A Case Study Of Quality Improvement Teams In A Total Quality Management Initiative In A Mid-Sized Manufacturing Company , James William Teegarden Jan 1996

Tqm Comes To The Carter Company: A Case Study Of Quality Improvement Teams In A Total Quality Management Initiative In A Mid-Sized Manufacturing Company , James William Teegarden

Retrospective Theses and Dissertations

This study examines a Total Quality Management (TQM) initiative in which cross functional quality improvement teams were a key element. The study was conducted in a mid-sized manufacturing company located in the Midwest, using a qualitative research paradigm, during the spring and summer of 1995. The Carter Company (a pseudonym) had started the TQM initiative 24 months before the study began;Information about the Carter Company's TQM initiative was obtained through interviews with the management group, with members of two cross functional quality improvement teams, and with groups of employees who had not been members of a cross functional ...


Schedule Network Node Time Distributions And Arrow Criticalities , Scott Kenneth Singleton Jan 1996

Schedule Network Node Time Distributions And Arrow Criticalities , Scott Kenneth Singleton

Retrospective Theses and Dissertations

This research develops exact methods to calculate project duration distributions and to calculate Van Slyke's (1963) criticality for arrows, the probability that an arrow is on a critical path, assuming nonnegative integer duration distributions. These calculations for project duration distributions correct estimates made by the Program Evaluation and Review Technique (PERT), and the Van Slyke criticality calculations extend the arrow criticality analysis by the Critical Path Method (CPM) into the probabilistic realm;Exact methods for calculating project duration distributions and Van Slyke's criticality are demonstrated on series networks, parallel networks, parallel-series networks, and the Wheatstone network. The Van ...


Resource Constrained Project Scheduling Using Simulated Annealing And Tabu Search, Ying-Wei Tsai Jan 1996

Resource Constrained Project Scheduling Using Simulated Annealing And Tabu Search, Ying-Wei Tsai

Retrospective Theses and Dissertations

No abstract provided.


Optimal Developmental Test Programs For One-Shot Systems , Michael James Moon Jan 1996

Optimal Developmental Test Programs For One-Shot Systems , Michael James Moon

Retrospective Theses and Dissertations

This dissertation considers two developmental testing models for one-shot systems, non-repairable devices that are destroyed by testing or first normal use (for example, rocket engines) when there is the potential for reliability growth through redesign. Given a limited budget and fixed cost per redesign, we wish to determine the sequence of redesigns and tests so that the expected number of effective systems in an ultimate stockpile of systems of the final design is maximized. We develop mathematical models and analyses which describe the optimal testing policies for this sequential decision problem. Further, we present properties of the models which, in ...


Construction Labor Productivity Modeling With Neural Networks And Regression Analysis , Rifat Sonmez Jan 1996

Construction Labor Productivity Modeling With Neural Networks And Regression Analysis , Rifat Sonmez

Retrospective Theses and Dissertations

Construction labor productivity variations are the results of several factors. However most of the productivity models developed address only the effect of a single factor. There are a few models, limited to masonry construction, in which multiple factors are considered. Regression analysis has been the common tool used in productivity studies, but in recent years neural networks have been a successful alternative for problems similar to construction labor productivity modeling. This study involved development of multivariate productivity models for concrete pouring, formwork, concrete finishing, and granular fill. A large sample was obtained from eight projects of a building contractor. Several ...


Statistical Analysis Of Maintenance Growth Curves , Thomas James Kirchoff Jan 1996

Statistical Analysis Of Maintenance Growth Curves , Thomas James Kirchoff

Retrospective Theses and Dissertations

Annual data on labor hours incurred for maintaining individual trucks in a large fleet are available from a truck leasing firm. Up to seven consecutive annual reports are available for a single truck, and by allowing cumulative mileage, the primary explanatory variable, to serve as a measure of time, data for a single truck can be effectively viewed as a sample from a growth curve taken at irregular inspection times. The goal is to predict labor hours for a subsequent year. Under this framework, three methods of analyzing the data are considered;(1) A linear interpolation method: Linear interpolation is ...


Electric Power Auction Market Implementation And Simulation , Jayant Kumar Jan 1996

Electric Power Auction Market Implementation And Simulation , Jayant Kumar

Retrospective Theses and Dissertations

This work is motivated by the recent changes in regulatory policies towards inter utility-power interchange practices. If competition replaces regulation as the norm of electric power generation and bulk power supply, a number of changes would be required. The NOPR proposes unbundling the utility companies into: Genco (generation company), Transco (transmission company), and disco (distribution company). A central coordinating body is called RTG in FERC's 1993 NOPR;This work has developed the foundation for market-based pricing of ancillary services in electric power transaction. It is used to design an auction market simulator;The developed brokerage model provides a unified ...


Scheduling For Client-Driven Capacitated Systems , Debra Sprunger Bishop Jan 1996

Scheduling For Client-Driven Capacitated Systems , Debra Sprunger Bishop

Retrospective Theses and Dissertations

Client-driven, capacitated systems have special characteristics that pose a unique challenge for those attempting to schedule and control such systems. The variable nature of client requirements, the prioritization of clients, limited resource availability, parallel tracks for projects, and stochastic nature of project activities all contribute to the unique nature of these types of systems. Using information gathered from representative systems, we first show how these stochastic, client-driven, capacitated systems can be modeled. Furthermore, these models can be used for real-time scheduling of project activities using a Bayesian approach and an objective function that targets project revenue. We conclude with an ...


Analytical And Finite Element Modeling Of A Machining System To Minimize Inaccuracy In Milling And Using Rapid Prototyping For Die Manufacturing , Parag Gupta Jan 1996

Analytical And Finite Element Modeling Of A Machining System To Minimize Inaccuracy In Milling And Using Rapid Prototyping For Die Manufacturing , Parag Gupta

Retrospective Theses and Dissertations

The end milling process is used extensively in a gamut of manufacturing areas. It accounts for up to 40% of the cost of fabrication of non-electrical parts for a high performance aircraft. This economically justifies the effort to find ways to reduce inaccuracy caused in milling by workpiece deformation, fixture deflection and cutter deflection to improve the quality of parts. The process is also used extensively for roughing and finishing of dies. However, the conventional die manufacturing process, which uses the milling process, is too time consuming because of the extensive CNC programming involved. Furthermore skilled labor required for CNC ...


Practical Feedback Stabilization Of Nonlinear Control Systems And Applications , Ruey-Gang Lai Jan 1996

Practical Feedback Stabilization Of Nonlinear Control Systems And Applications , Ruey-Gang Lai

Retrospective Theses and Dissertations

An important and challenging research subject in the field of nonlinear control systems is the impact of input constraints on control performance, which is more realistic in practical problems but much more difficult in mathematical analysis, such as the concepts of controllability, stability, stabilization, domain of attraction, controlled invariance and so on, especially when unstable systems are involved;More precisely, we consider the nonlinear system of the form x = f(x) on a smooth manifold M⊂ Rd together with the family of control-affine systems \dot x=f(x)+[sigma]spi=1mui(t)gi(x) with constrained control range U⊂ Rm ...