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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Institute of Industrial Engineers
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Korean Institute of Industrial Engineers
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Volume & Issues
Volume 14, Issue 2 - Dec 1988
Volume 14, Issue 1 - Jun 1988
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An Evaluation of Error Performance Estimation Schemes for DS1 Transmission Systems Carrying Live Traffic
Eu, J.H. ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 1~15
DS1 transmission systems use framing bit errors, bipolar violations and code-detected errors to estimate the bit error rate when determining errored and severely errored seconds. Using the coefficient of variation under the memoryless binary symmetric channel assumption, a basic framework to evaluate these estimation schemes is proposed to provide a practical guideline in determining errored and severely errored seconds which are fundamental in monitoring the real-ime error performance of DS1 transmission systems carrying live traffic. To evaluate the performance of the cyclic redundancy check code (CRC), a computer simulation model is used. Several drawbacks of the superframe format in association with real time error performance monitoring are discussed. A few recommendations are suggested in measuring errored and severely errored seconds, and determining service limit alarms through the use of the superframe format. Furthermore, we propose a new robust scheme for determining service limit alarms which take into consideration the limitations of some estimation schemes for the time interval of one second.
Analysis of a Queueing System with Two Types of Arrival Patterns
Lee, Hwa-Gi ; Yun, Eun-Sang ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 17~30
The aim of this project is to analyze the queueing model with the two types of customers which either can wait unrestrictedly or wait restrictively in the system depending on the condition of service facility unless they may be served immediately. This model consists of the three-dimensional state space and then quasi birth-death process is formulated. The steady-state probabilities and measures of performance of this system are derived by using Matrix Geometric method.
A Study on Class-based Turnover Assignment in Automated Storage/Retrieval Systems with Continuous Rectangular Rack Face in Time
Hwang, Hark ; Koh, Sie-Gheun ; Jang, Gil-Sang ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 31~42
This paper studies class-based turnover assignment rule in terms of the expected travel time in automated storage/retrieval systems (AS/RS). With the rack face not necessarily in square in time, travel time models of two and three-class systems are developed, from which class partition values are determined for single command cycle. Also, the effects of the system parameters such as the rack shape factor and the skewness of the ABC curve are evaluated on the travel time through example problems.
Sensitivity Analysis of Matrix Game by using Linear Programming
Seong, Gi-Seok ; Park, Sun-Dal ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 43~49
The purpose of this paper is to study the sensitivity analysis of matrix game by means of linear programming. The relations between matrix game and linear programming is well known. In this paper we first transform matrix game into linear programming. The sensitivity analysis of matrix game is performed by that of linear programming.
The use of spectral analysis in choosing time series and forecasting models
Jeon, Deok-Bin ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 51~56
A spectrum analysis method is presented with an example as an aid to Box and Jerkins' model identification procedure, where the theoretical spectrum of ARMA model and its confidence intervals derived by chi-square distribution are compared. An APL (A Programming Language) program for the method is developed for the 16-bit personal computer.
Evaluation by Fuzzy Checklist
Kim, Kuk ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 57~71
Checklist method is rapid and comprehensive to evaluate in practice. Check items are commonly rated by subjective utility function; i.e., evaluator's significant judgment. Since human judgment includes fuzziness (vagueness) inherently in spite of its significance, fuzzy set theory is useful in this case. The paper illustrates a evaluation method using fuzzy checklist where check items are rated as fuzzy numbers. Pairwise comparison data is used to determine the weights of check items, since it has comparative advantage for human's fuzzy judgment. Sample of BASIC program is provided for microcomputer. When uncertainty is due to subjectivity or imprecision of data, this method can be applied to practical problems widely.
A Scheduling Heuristic Alogorithm for Flexible Manufacturing Systems
No, In-Gyu ; Choe, Jeong-Sang ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 73~82
This research is concerned with production scheduling for FMS (Flexible Manufacturing System) which consists of machine centers served by cycle conveyor. The objective of the research is to develop and evaluate scheduling procedures to minimize the mean flow time. An optimal algorithm called SCTF (Shortest Circle Time First) is proposed when the conveyor runs at minimum possible speed (CS=1) and a heuristic algorithm called SCTJMF (Shortest Cycle Time and Job Matching Algorithm) is suggested when the conveyor runs at double speed (CS=2). The evaluation of the heuristic algorithm was implemented by comparison with the optimal algorithm for 112 experimentations for CS=1 and random schedule. The results showed that the proposed heuristic algorithm provides better solution that can be regarded noticeable when compared with SCTF algorithm and random scheduling.
Optimal Screening Procedures with Dichotomous Performance and Continuous Screening Variables
Bae, Do-Seon ; Kim, Sang-Bok ; An, Sang-Sik ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 83~89
Optimal screening procedures with dichotomous performance variable T and continuous screening variable X are presented for assuring with a specified degree of confidence that at least
out of m items found acceptable in screening inspection are conforming. It is assumed that T is a Bernoulli random variable and that the conditional distribution of X given T=t is normal. When m is also to be determined, optimal m and cut-off value of X minimizing the total expected cost are obtained. Cases of known and unknown parameters are considered and for unknown parameter cases, Bayesian approaches are used to find the optimal screening procedures.
Break-even Analysis with Learning Effect Under Inflation
Kim, Ji-Soo ; Kim, Jin-Wook ; Rim, Jeong-Mook ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 91~101
Break-even analysis is a simple and useful tool in decisions and planning activities though its use is somewhat limited to short-term analysis. The subject is discussed in the fields of engineering economics, production management, cost and managerial accounting, finance, marketing, and so on. Conventional break-even analysis suits the case of stable price and low interest rate. In this paper, we try to overcome the limit by considering following factors, namely, time value of money, depreciation, tax, and capital gains. Also, considering learning effect, we increase applicability to a new project which raises certain changes such as a replacement of production process, an employee turnover, etc. Thus, we suggest a model which has a dynamic break-even quantity per period for the project. Furthermore, we examine the effect of inflation in break-even analysis.
Generalized Replacement Demand Forecasting to Complement Diffusion Models
Chung, Kyu-Suk ; Park, Sung-Joo ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 103~117
Replacement demand plays an important role to forecast the total demand of durable goods, while most of the diffusion models deal with only adoption data, namely initial purchase demand. This paper presents replacement demand forecasting models incorporating repurchase rate, multi-ownership, and dynamic product life to complement the existing diffusion models. The performance of replacement demand forecasting models are analyzed and practical guidelines for the application of the models are suggested when life distribution data or adoption data are not available.
The Solution of Vehicle Scheduling Problems with Multiple Objectives in a Probabilistic Environment
Park, Yang-Byung ;
Journal of Korean Institute of Industrial Engineers, volume 14, issue 1, 1988, Pages 119~131
Vehicle Scheduling Problem (VSP) is a generic name given to a whole class of problems involving the visiting of "stations" by "vehicles," where a time is associated with each activity. The studies performed to date have the common feature of a single objective while satisfying a set of restrictions and known customer supplies or demands. However, VSPs may involve relevant multiple objectives and probabilistic supplies or demands at stations, creating multicriteria stochastic VSPs. This paper proposes a heuristic algorithm based on goal programming approach to schedule the most satisfactory vehicle routes of a bicriteria VSP with probabilistic supplies at stations. The two relevant objectives are the minimization of the expected travel distance of vehicles and the minimization of the due time violation for collection service at stations by vehicles. The algorithm developed consists of three major stages. In the first stage, an artificial capacity of vehicle is determined, on the basis of decision maker's subjective estimates. The second one clusters a set of stations into subsets by applying an efficient cluster method developed. In the third one, the stations in each subset are scheduled by applying an iterative goal programming heuristic procedure to each cluster.