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Full-Text Articles in Engineering

Design Of Developmental Test Programs For One-Shot Systems With Two State Reliability , Mu-Yeh Huang Jan 1995

Design Of Developmental Test Programs For One-Shot Systems With Two State Reliability , Mu-Yeh Huang

Retrospective Theses and Dissertations

This dissertation considers efficient developmental testing for one-shot systems (for example, missiles) that are destroyed in testing or first normal use, where there is the possibility of "reliability growth" of the basic system design as a result of redesigns following failed developmental tests. We consider situations where the cost of redesign is negligible and there is a fixed procurement budget covering both system development and purchase, each developmental test produces either a binary (success-failure) or a continuous outcome. The analysis offered here is intended as an answer to the question "How much testing is enough?" posed by Seglie (1992) in ...


Characterization Of Surface Profiles Using Discrete Measurement Systems , Tai-Hung Yang Jan 1995

Characterization Of Surface Profiles Using Discrete Measurement Systems , Tai-Hung Yang

Retrospective Theses and Dissertations

Form error estimation techniques based on discrete point measurements can lead to significant errors in form tolerance evaluation. By modeling surface profiles as random variables, we are able to show how sample size and fitting techniques affect form error estimation. Depending on the surface characteristics, typical sampling techniques can result in estimation errors of as much as 50%;We investigate current available interpolation procedures. Kriging is an optimal interpolation for spatial data when the model of variogram is known a priori. Due to the difficulty in identifying the correct variogram model from the limited sampled data and lack of complete ...


Market-Based Allocation Mechanisms For Lot-Size Decision Makers And Electric Power Utilities , Cheng-Kang Chen Jan 1995

Market-Based Allocation Mechanisms For Lot-Size Decision Makers And Electric Power Utilities , Cheng-Kang Chen

Retrospective Theses and Dissertations

The objective of this dissertation is to investigate how lot-size decision makers and electric power utilities determine critical economic quantities (e.g., the order quantities for the lot-size decision makers and the transmission service charges for the electric power utilities). A primary motivation of this study is to improve the economic efficiency (often measured in terms of cost saving) for lot-size decision makers and electric power utilities;For lot-size decision makers, we extend the traditional economic order quantity (EOQ) model by considering various aspects of model environments such as pricing policies. First, we investigate the inventory and disposal policies for ...


The Development And Testing Of New, Single And Multiple Echelon, Dynamic, Capacitated, Lot Sizing Heuristics , Robert Jay Mccoy Jan 1995

The Development And Testing Of New, Single And Multiple Echelon, Dynamic, Capacitated, Lot Sizing Heuristics , Robert Jay Mccoy

Retrospective Theses and Dissertations

Three new heuristics and two random problem generators are introduced and tested. These heuristics and problem generators are associated with single and multiple echelon, dynamic, capacitated lot sizing problems, with or without setup times. These types of problems often occur in an MRP environment;First, the Dixon and Silver (DS) lot sizing heuristic was extended. The new, single echelon heuristic offers improved cost performance at a small computational expense. It incorporates newly developed perturbation factors that allow for multiple iterations of the DS heuristic. At the conclusion of all iterations, the lowest cost production plan is recalled. The second, single ...


Manufacturing Cell Formation In A Fuzzy Environment , Chang-Chun Tsai Jan 1995

Manufacturing Cell Formation In A Fuzzy Environment , Chang-Chun Tsai

Retrospective Theses and Dissertations

The main objective of this study is to develop useful mathematical programming (FMP) models to solve cell formation (CF) problems in fuzzy environments. The dissertation was divided into three major parts. First, two mathematical programming models were developed to formulate the cell formation problems under consideration. The first model was a linear programming (LP) model for grouping parts and machines simultaneously into cells and solving the CF problem for dealing with exceptional elements (EEs). In second, a goal programming (GP) model to obtain a trade off between minimizing total cost of dealing with EEs and maximizing GE, a new similarity ...