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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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Journal DOI :
Korean Institute of Industrial Engineers
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Volume & Issues
Volume 28, Issue 4 - Dec 2002
Volume 28, Issue 3 - Sep 2002
Volume 28, Issue 2 - Jun 2002
Volume 28, Issue 1 - Mar 2002
Selecting the target year
Analysis of Economic Replenishment Policy for Exponentially Deteriorating Products under Trade Credit Depending on the Amount of Purchase
Shinn, Seong-Whan ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 232~239
This paper analyzes how a buyer can determine the economic replenishment policy when the supplier allows delay in payments for an order of a product. For the analysis, it is assumed that the length of credit period is a function of the buyer's amount of purchase, and inventory is depleted not only by buyer's demand but also by deterioration. Investigation of the properties of the model developed allows us to develop an algorithm whose validity is illustrated using an example problem.
Economic Screening Procedures in Normal and Logistic Models when the Rejected Items are Reprocessed
Hong, Sung-Hoon ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 240~246
In this paper, economic screening procedures with dichotomous performance variable T and continuous screening variable X are considered when the rejected items are reprocessed. Two models are considered; normal and logistic models. It is assumed that X given T is normally distributed in the normal model, and P(T=1|X=x) is given by a logistic function in the logistic model. Profit models are constructed which involve four price/cost components; selling price, cost from an accepted nonconforming item, and reprocessing and inspection costs. Methods of finding the optimal screening procedures are presented and numerical examples are given.
A Note on the Decomposition Property for
/G/1 Queues with Generalized Vacations
Chae, Kyung-Chul ; Choi, Dae-Won ; Lee, Ho-Woo ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 247~255
The objective of this paper is to clarify the decomposition property for
/G/1 queues with generalized vacations so that the decomposition property is better understood and becomes more applicable. As an example model, we use the
/G/1 queue with setup time. For this queue, we correct Choudhry's (2000) steady-state queue size PGF and derive the steady-state waiting time LST. We also present a meaningful interpretation for the decomposed steady-state waiting time LST.
Fleet Sizing under Dynamic Vehicle Dispatching
Koo, Pyung-Hoi ; Suh, Jungdae ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 256~263
This paper addresses a planning problem in a pickup-delivery transportation' system under dynamic vehicle dispatching. We present a procedure to determine a fleet size in which stochastic characteristics of vehicle travels are considered. Statistical approach and queueing theory are applied to estimate vehicle travel time and vehicle waiting time, based on which an appropriate fleet size is determined. Simulation experiments are performed to verify the proposed procedure.
Optimal Disassembly Sequencing with Sequence-Dependent Operation Times Based on the Directed Graph of Assembly States
Kang, Jun-Gyu ; Lee, Dong-Ho ; Xirouchakis, Paul ; Lambert, A.J.D. ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 264~273
This paper focuses on disassembly sequencing, which is the problem of determining the optimum disassembly level and the corresponding disassembly sequence for a product at its end-of-life with the objective of maximizing the overall profit. In particular, sequence-dependent operation times, which frequently occur in practice due to tool-changeover, part reorientation, etc, are considered in the parallel disassembly environment. To represent the problem, a modified directed graph of assembly states is suggested as an extension of the existing extended process graph. Based on the directed graph, the problem is transformed into the shortest path problem and formulated as a linear programming model that can be solved straightforwardly with standard techniques. A case study on a photocopier was done and the results are reported.
A Study on Customer Characteristics in B2B Transactions Using Three-dimensional Positioning Map and Web-shape Customer Needs Analysis
Park, Chan-Ju ; Park, Yunsun ; Kim, Chang-Ouk ; Joo, Sang-ho ; Kim, Sun-il ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 274~282
This paper discusses a multi-dimensional analysis for Customer Relationship Management (CRM). For this, We propose a decision-making methodology which employs three analysis models. The first model is a three-dimension positioning map to derive a strategy which achieves the Process Value Line (PVL). The second model is the web-shape analysis model to visibly understand the individual based on the customer CSI (Customer Satisfactory Index) data. The third model which supports the web-shape analysis model, is the relative satisfactory analysis model. It considers a satisfaction level after purchasing against before purchasing. Then we perform overall analysis based on the three analysis models to provide marketing strategies to decision makers.
A Study on Developing Fold-Over Designs with Four-Level Quantitative Factors
Choi, Kiew-Phil ; Byun, Jai-Hyun ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 283~290
Two-level fractional factorial designs are widely used when many factors are considered. When two-level fractional factorial designs are used, some effects are confounded with each other. To break the confounding between effects, we can use fractional factorial designs, called fold-over designs, in which certain signs in the design generators are switched. In this paper, optimal fold-over designs with four-level quantitative and two-level factors are presented for (1) the initial designs without curvature effect and (2) those with curvature effect. Optimal fold-over design tables are provided for 8-run, 16-run, and 32-run experiments.
Pricing·Quality and Service Mix Strategies for Portal Sites Providing Various Services
Lee, Kang Bae ; Joo, Cheol Min ; Lee, Woon-Seek ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 291~301
In this paper, we introduce a mathematical model to analyze pricing/quality and service mix strategies for Internet Portal site. This model includes utilities and costs of each participants, i.e., user, third party provider, and portal sites. Especially, we consider portal sites that initiate their businesses by providing free services like free e-mail service or search service and providing several charged services. As the results, we can find that Portal sites should make the target of customers and focus them to maximize their profit. Portal sites should pay their marketing effort not for all customers but pertinent portions of customers. And Portal sites should make more efforts to efficiently develop and provision their services.
A Study on a To-Be System Design for the Operational Information System of Postal Service
Yee, Soung Ryong ; Sun, Ji Ung ; Lee, Kyungsik ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 302~318
As facing the challenges from many competitors, the Office of Korea Postal Service has issued the fundamental plan of business renovation which includes the master plan of the information systems. In this paper we discuss the design of a to-be information system for postal service, which will be provided for the completion of the master plan. After briefly discussing the issues on developing information system and the current situation, we provide the design concept and the framework of the to-be system based on the bench marking and gap analysis with advanced systems. The to-be system consists of eight subsystems which can be grouped into three categories; intelligent systems, operational systems, and platforms. We develop detailed specification of each subsystem and provide an operational scenario. We also explain how the to-be system compatibly fits into an integrated information system, which will include the postal, banking, and management functions, to perform its ultimate role for the efficient postal service.
Operational Behavior of the BMAP/G/1 Queue with Server Control
Lee, Ho Woo ; Park, No Ik ; Park, Jong Geun ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 319~330
We consider BMAP/G/1 queueing system with N-policy and multiple vacations. We derive the vector generating functions of the queue length in a factorized form and interpret the factorization. We also derive the mean queue length.
User Satisfaction Models Based on a Fuzzy Rule-Based Modeling Approach
Park, Jungchul ; Han, Sung H. ;
Journal of Korean Institute of Industrial Engineers, volume 28, issue 3, 2002, Pages 331~343
This paper proposes a fuzzy rule-based model as a means to build usability models between emotional satisfaction and design variables of consumer products. Based on a subtractive clustering algorithm, this model obtains partially overlapping rules from existing data and builds multiple local models each of which has a form of a linear regression equation. The best subset procedure and cross validation technique are used to select appropriate input variables. The proposed technique was applied to the modeling of luxuriousness, balance, and attractiveness of office chairs. For comparison, regression models were built on the same data in two different ways; one using only potentially important variables selected by the design experts, and the other using all the design variables available. The results showed that the fuzzy rule-based model had a great benefit in terms of the number of variables included in the model. They also turned out to be adequate for predicting the usability of a new product. Better yet, the information on the product classes and their satisfaction levels can be obtained by interpreting the rules. The models, when combined with the information from the regression models, are expected to help the designers gain valuable insights in designing a new product.