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

Economics Of Sacrificial Fixturing For Cnc Machining And Rapid Manufacturing, Kevin Mcbrearty, Richard A. Wysk, Matthew C. Frank Sep 2004

Economics Of Sacrificial Fixturing For Cnc Machining And Rapid Manufacturing, Kevin Mcbrearty, Richard A. Wysk, Matthew C. Frank

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

This paper presents a fixturing method for sacrificial fixturing machining using CNC equipment. The focus of the paper is not on the method itself, but on the economics of sacrificial fixturing CNC machining, which defines the domain of use for the results described in the paper. The paper presents an economic model of machining, and then analyzes the use of the method as a function of: the number of parts to be produced, the ratio of material removed to final part volume, the number of features on the part, and the basic part geometry. We conclude that sacrificial fixturing is ...


Visibility From A Slice File For Rapid Cnc Machining, Matthew C. Frank, Richard A. Wysk, Sanjay B. Joshi Jan 2004

Visibility From A Slice File For Rapid Cnc Machining, Matthew C. Frank, Richard A. Wysk, Sanjay B. Joshi

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

A methodology for using CNC machining as a rapid prototyping process is being developed. The method involves cutting complex parts using layer-based machining operations from a plurality of orientations about one axis of rotation. A critical step is to determine the number of and location of those orientations. This paper presents an approach to mapping the visibility of a model about an axis of rotation using a set of model slices taken orthogonal to the axis of rotation.


Workforce Scheduling With Costs And Ergonomic Considerations, Sasidhar Malladi, K. Jo Min Jan 2004

Workforce Scheduling With Costs And Ergonomic Considerations, Sasidhar Malladi, K. Jo Min

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

In this paper, we develop a workforce scheduling methodology, which takes both financial costs and ergonomic factors such as the avoidance of backward rotations and consecutive night shifts into consideration. First, we obtain relative weights for each complete schedule called a scheme by applying analytic hierarchy process (AHP) under financial costs and ergonomic factors criteria. Next, we formulate an integer program with weights from AHP to select the optimal set of schemes. In addition, we show how the ergonomic aspects of a given set of schemes can be improved via an assignment formulation when the planning horizon repeats itself.


The Effect Of Technological Improvement On Capacity Expansion For Uncertain Exponential Demand With Lead Times, Dohyun Pak, Nattapol Pornsalnuwat, Sarah M. Ryan Jan 2004

The Effect Of Technological Improvement On Capacity Expansion For Uncertain Exponential Demand With Lead Times, Dohyun Pak, Nattapol Pornsalnuwat, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Publications

We formulate a model of capacity expansion that is relevant to a service provider for whom the cost of capacity shortages would be considerable but difficult to quantify exactly. Due to demand uncertainty and a lead time for adding capacity, not all shortages are avoidable. In addition, technological innovations will reduce the cost of adding capacity but may not be completely predictable. Analytical expressions for the infinite horizon expansion cost and shortages are optimized numerically. Sensitivity analyses allow us to determine the impact of technological change on the optimal timing and sizes of capacity expansions to account for economies of ...


The Engineering Learning Portal For Problem Solving: Experience In A Large Engineering Economy Class, Sarah M. Ryan, John K. Jackman, Frank E. Peters, Sigurdur Olafsson, Mary Huba Jan 2004

The Engineering Learning Portal For Problem Solving: Experience In A Large Engineering Economy Class, Sarah M. Ryan, John K. Jackman, Frank E. Peters, Sigurdur Olafsson, Mary Huba

Industrial and Manufacturing Systems Engineering Publications

In an effort to improve students' problem solving skills with information technology across the industrial engineering curriculum, we created an Internet based problem-solving environment. The module implemented for engineering economy presents a realistic problem that establishes connections with other courses. The design of the learning environment promotes metacognitive skill development by requiring students to explain each major problem solving action taken and to evaluate their own progress toward a solution. Experience in two successive semesters of a large introductory course indicates that information technology can be used effectively to create opportunities for students to collaboratively solve realistic engineering problems, thereby ...


Determining Multi-Criteria Priorities In The Planning Of Electric Power Generation: The Development Of An Analytic Hierarchy Process For Using The Opinions Of Experts, Sung Chul Kim, Kyung J. Min Jan 2004

Determining Multi-Criteria Priorities In The Planning Of Electric Power Generation: The Development Of An Analytic Hierarchy Process For Using The Opinions Of Experts, Sung Chul Kim, Kyung J. Min

Industrial and Manufacturing Systems Engineering Publications

The electric power industry in the United States is undergoing substantial changes in power gene ration business as well as in environmental regulation. Under these changes, it is highly desirable for the electric power industry to objectively and quantitatively examine generation planning, which often involves a multiple number of different experts with multi-criteria for decision making. In this paper, we consider these two key aspects in generation planning (multi-experts/multi-criteria), and integrate an analytic hierarchy process for multi-criteria decision making and a Bayesian approach for combining experts' opinions. Our efforts lead to a comprehensive numerical example that illustrates multi-experts/multi-criteria ...


Integrated Curriculum To Improve Engineering Problem Solving, John K. Jackman, Sigurdur Olafsson, Frank E. Peters, Sarah M. Ryan Jan 2004

Integrated Curriculum To Improve Engineering Problem Solving, John K. Jackman, Sigurdur Olafsson, Frank E. Peters, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

A series of modules based on realistic problems are being developed for our industrial engineering curriculum. These modules require students to use a variety of information technology skills to access, screen and analyze the data available to them. The modules are also designed to help students build relationships among the courses, which they traditionally treat as isolated bodies of knowledge. Students’ engineering problem solving will also be enhanced by the challenge presented by more realistic open-ended problems that are incorporated into the modules. This paper details the results of the latest module used in a Manufacturing Systems Engineering course.


Implementation And Assessment Of Industrial Engineering Curriculum Reform, Sigurdur Olafsson, Kevin P. Saunders, John K. Jackman, Frank E. Peters, Sarah M. Ryan, Veronica J. Dark, Mary Huba Jan 2004

Implementation And Assessment Of Industrial Engineering Curriculum Reform, Sigurdur Olafsson, Kevin P. Saunders, John K. Jackman, Frank E. Peters, Sarah M. Ryan, Veronica J. Dark, Mary Huba

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

We describe a curriculum reform project that aims to improve the industrial engineering curriculum through a web-based learning environment that engages students in active and collaborative learning. This environment focuses on engineering problems solving, increased information technology content, and the higher order cognitive skills that are needed to be a successful engineering problem solver. We describe the status of this project, which has been implemented in two courses: an engineering economy course and a manufacturing systems engineering course. One of the objectives of this new environment is integration of the curriculum, and we discuss how links were created between these ...


Capacity Expansion For Random Exponential Demand Growth With Lead Times, Sarah M. Ryan Jan 2004

Capacity Expansion For Random Exponential Demand Growth With Lead Times, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Publications

The combination of demand uncertainty and a lead time for adding capacity creates the risk of capacity shortage during the lead time. We formulate a model of capacity expansion for uncertain exponential demand growth and deterministic expansion lead times when there is an obligation to provide a specified level of service. The service level, defined in terms of the ratio of expected lead-time shortage to installed capacity, is guaranteed by timing each expansion to begin when demand reaches a fixed proportion of the capacity position. Under this timing rule, the optimal facilities to install can be determined by solving an ...


Development Programs For One-Shot Systems Using Multiple-State Design Reliability Models, Suntichai Shevasuthisilp, Stephen B. Vardeman Jan 2004

Development Programs For One-Shot Systems Using Multiple-State Design Reliability Models, Suntichai Shevasuthisilp, Stephen B. Vardeman

Industrial and Manufacturing Systems Engineering Publications

Design reliability at the beginning of a product development program is typically low, and development costs can account for a large proportion of total product cost. We consider how to conduct development programs (series of tests and redesigns) for one-shot systems (which are destroyed at first use or during testing). In rough terms, our aim is to both achieve high final design reliability and spend as little of a fixed budget as possible on development. We employ multiple-state reliability models. Dynamic programming is used to identify a best test-and-redesign strategy and is shown to be presently computationally feasible for at ...