Open Access. Powered by Scholars. Published by Universities.®

Operations Research, Systems Engineering and Industrial Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Series

Iowa State University

2000

Articles 1 - 3 of 3

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

A Simplified Procedure For Estimating Labor-Hour Requirements Of Discrete Assemblies, Deepak Srinivas, Kyung J. Min Jan 2000

A Simplified Procedure For Estimating Labor-Hour Requirements Of Discrete Assemblies, Deepak Srinivas, Kyung J. Min

Industrial and Manufacturing Systems Engineering Publications

Estimating the labor-hour requirements of discrete assemblies is often critical to numerous manufacturers because of its usefulness in determining the production cycle time, the costs of products, the performance of employees, and the price quotes to customers. The traditional method does not necessarily provide a fast and realistic estimation because of the time and complexity necessary to develop and estimate pre-specified times and allowances. In this paper. we propose a new procedure that is simpler and/aster. First, we present the data requirements and the regression-based procedure to estimate the Labor-hour requirements. Next, we show how specific linear and nonlinear ...


Determining Inventory Levels In A Conwip Controlled Job Shop, Sarah M. Ryan, Bruno Baynat, F. Fred Choobineh Jan 2000

Determining Inventory Levels In A Conwip Controlled Job Shop, Sarah M. Ryan, Bruno Baynat, F. Fred Choobineh

Industrial and Manufacturing Systems Engineering Publications

We extend the concept of CONWIP control to a job shop setting, in which multiple products with distinct routings compete for the same set of resources. The problem is to determine the fixed overall WIP level and its allocation to product types (WIP mix) to meet a uniformly high customer service requirement for each product type. We formulate an optimization problem for an open queuing network model in which customer orders pull completed products from the system. Then, assuming heavy demand, we derive a throughput target for each product type in a closed queuing network and provide a simple heuristic ...


Form Error Estimation Using Spatial Statistics, Tai-Hung Yang, John K. Jackman Jan 2000

Form Error Estimation Using Spatial Statistics, Tai-Hung Yang, John K. Jackman

Industrial and Manufacturing Systems Engineering Publications

Form error estimation is an essential step in the assessment of product geometry created through one or more manufacturing processes. We present a new method using spatial statistics to estimate form error. Using large sets of uniform sample points measured from five common machined surfaces, we compare the form error estimates using individual points and fitted surfaces obtained through spatial statistical methods. The results show that spatial statistics can provide more accurate estimates of form error under certain conditions.