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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Korean Institute of Industrial Engineers
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Volume & Issues
Volume 21, Issue 4 - Dec 2008
Volume 21, Issue 3 - Sep 2008
Volume 21, Issue 2 - Jun 2008
Volume 21, Issue 1 - Mar 2008
Selecting the target year
A Study of Semiconductor Process Control using Dual Damping EWMA
Kim, Seon-Eok ; Ko, Hyo-Heon ; Kim, Jih-Yun ; Kim, Sung-Shick ;
IE interfaces, volume 21, issue 2, 2008, Pages 141~150
In this paper, an efficient control method for semiconductor fabrication process is presented. Generally, control is performed with data which is under the influence of process disturbance. EWMA is one of the most popular control methods in semiconductor fabrication that effectively deals with varying process condition. A new method using EWMA, called the Dual Damping EWMA, is presented in this study to reduce over-control by separating weight factor of input and output. The goal is to reflect Drift but reduce the effects of White noise in run to run control. Simulation is performed to evaluate the performance of DPEWMA and to compare with EWMA and Double EWMA.
Effective Construction Method of Defect Size Distribution Using AOI Data: Application for Semiconductor and LCD Manufacturing
Ha, Chung-Hun ;
IE interfaces, volume 21, issue 2, 2008, Pages 151~160
Defect size distribution is a probability density function for the defects that occur on wafers or glasses during semiconductor/LCD fabrication. It is one of the most important information to estimate manufacturing yield using well-known statistical estimation methods. The defects are detected by automatic optical inspection (AOI) facilities. However, the data that is provided from AOI is not accurate due to resolution of AOI and its defect detection mechanism. It causes distortion of defect size distribution and results in wrong estimation of the manufacturing yield. In this paper, I suggest a size conversion method and a maximum likelihood estimator to overcome the vague defect size information of AOI. The methods are verified by the Monte Carlo simulation that is constructed as similar as real situation.
Bullwhip Effect and Lot Size: the Main Cause of BwE is Lot Size
Paik, Si-Hyun ;
IE interfaces, volume 21, issue 2, 2008, Pages 161~169
Normally, suppliers have to decide on what, how much, and when to replenish stocks of goods based on a data flow generated by a vendor managed inventory(VMI) system. But information from supply chain is often misleading. It is common for such data to be distorted by a lack of coordination and synchronization across several business entities managing different supply chain operations. This phenomenon is called the 'bullwhip effect(BwE)'. Many researchers, working over many years, have studied the reasons for the BwE. They have proposed various remedies, but this phenomenon persists. Though overlooked in previous research, this paper reveals that the 'lot size' of a supply chain of distribution is indeed the main cause of the BwE. In addition, some problems in the existing methods of measuring the BwE are identified and a revised much improved method of measurement is suggested.
Optimal Room Assignment Problem for Multi-floor Facility using Binary Integer Programming
Lee, Sang-Won ; Rim, Suk-Chul ;
IE interfaces, volume 21, issue 2, 2008, Pages 170~176
Consider a multi-floor facility with multiple rooms of unequal size on each floor. Students come from many organizations to attend the conference to be held at this facility. In assigning the rooms to the students, several constraints must be met; such as boys and girls must not be assigned to the rooms on the same floor. Given the capacity of each room and the number of students from each organization, the problem is assigning students to rooms under a set of constraints and various objectives. We present six models with different objective functions; and formulate them as binary integer programming problems. A numerical example and a case study follow to illustrate the proposed models.
RDF Based Logistics Data Modeling and Applications in the Ubiquitous Environment
Jun, Hong-Bae ; Suh, Hyo-Won ;
IE interfaces, volume 21, issue 2, 2008, Pages 177~188
Recently, due to emerging technologies such as radio frequency identification(RFID), global positioning system(GPS), and wireless mobile communication technologies, it is possible to build up the infrastructure for tracking and tracing product logistics data at any place and at any time. However, for implementing the infrastructure, it is necessary to develop a suitable management method for product logistics data. To this end, this study deals with a resource description framework(RDF) based modeling and application method for product logistics data in the ubiquitous environment. It will give us the capability to control product logistics data, which leads to streamline logistics operations.
Capacity Analysis of MMR(Mobile Multihop Relay) System
Lee, Kang-Won ; Kook, Kwang-Ho ; Choi, Song-In ;
IE interfaces, volume 21, issue 2, 2008, Pages 189~197
This study shows achievable capacity gain from the MMR system. Relay stations are placed along the cell boundary in tiers. We can have as many tiers of relays and as many relays in each tier as we want. A model is developed, which can estimate the system capacity varying the number of relays in each tier and the bandwidths allocated to the BS and the RS. It is shown that maximum capacity increases are 21.5% and 18.9% when we have relays in the first tier only and in the first and the second tiers, respectively.
Research on a Streamlined Software Project Management Model for Small-sized Software Enterprises
Lee, Jeong-Eun ; Park, Ju-Chull ;
IE interfaces, volume 21, issue 2, 2008, Pages 198~208
Effective management of a project is a crucial issue to software companies. There are various international standards, such as CMM, ISO9000, and SPICE, applied to project management. But, small scale companies have some difficulties in accepting those standards because of its complexity and enormous manpower requirements. This study proposes a project management approach streamlining the CMM by which a small scale software company can perform the tasks with ease. A prototype system has also been developed to show the capability of the proposed model.
A Technology Convergent Medical Service Engineering Model based on the Dynamic Innovation Theory
Kim, Jong-Ho ;
IE interfaces, volume 21, issue 2, 2008, Pages 209~220
Recently, innovative medical services are fast emerging, which include customized medical services based on bio-informatics, composition of cure and well-being exploiting ubiquitous technology, hospital supply chain management using RFID, and so forth. However, conventional approaches for new service development hardly give us systematic model to analyze and produce creative medical services. Because most of them are static and concentrate on microscopic tools or techniques. Thus, it is highly desirable to suggest an integrative framework to organize the whole transformation process from technology to medical service. The objective of this study is to propose a medical service engineering model based on the dynamic innovation theory. The proposed model contains objectives of service system, strategies of hospital, stages, activities required to deal with medical service life cycle, which incorporates the acquisition of new technology, transformation to the product, penetration into market, and adoption of consumers. In addition, the usefulness and applicability of the newly proposed model are provided using catholic medical center example.
Estimation of Process Parameters Using QFD and Neural Networks in Injection Molding
Koh, Bum-Wok ; Kim, Jong-Seong ; Choi, Hoo-Gon ;
IE interfaces, volume 21, issue 2, 2008, Pages 221~228
The injection molding process is able to produce high precision manufactures as a single process with fast speed. However, the prices of both the mold and the molding machine are expensive, and the single process is very complex and difficult to compose of the exact relationship between the process setting conditions and the product quality. Therefore, the quality of a molded product often depends on a skillful engineer's operations in the design of both parts and molds. In this paper, the relationship between the process conditions and the defectiveness is built for better manufactures under settings of the appropriate parameters, and so it can reduce the setup time in the injection molding process. Quality Function Deployment (QFD) provides severe defectiveness factors along with the related process parameters. Also, neural networks estimate the relationship between defective factors and process setting parameters, and lead to reduce the defectiveness of molded parts.
Case Study on Location Tracking System using RFID Active Tag and Improvement of Scheduling System in Semiconductor Manufacturing
Kim, Gahm-Yong ; Chae, Myoung-Sin ; Yu, Jae-Eon ;
IE interfaces, volume 21, issue 2, 2008, Pages 229~236
Recently, ubiquitous computing paradigm considers as a tool for making innovation and competitive strength in manufacturing industry like other industries. Particularly, the location-based service that enables us to trace real-time logistics make effective management of schedules for inventory control, facilities and equipments, jobs planning, and facilitate the processes of information management and intelligence, which relate with ERP and SCM in organizations. Our study tries to build the location-based system for products of semiconductors in manufacturing place and suggests the good conditions and effective tracking procedures for positions of products. Our study show that the system is good for the saving of time in tracking products, however, it has to be improved in terms of accuracy. The study verifies the application of RFID technology in manufacturing industry and suggests the improvement of photograph process through RFID. In addition, our research introduces the future operation of FAB in semiconductors' processes that relate with real-time automation and RFID in manufacturing company.
Data Mining for the Effectiveness of Government Support Strategies for Technology Innovation in Service Sectors
Hwang, Doo-Hyun ; Kim, Woo-Jin ; Sohn, So-Young ;
IE interfaces, volume 21, issue 2, 2008, Pages 237~246
In today's competitive global environment, technological innovation is an important issue. Many countries are devising national level strategies to further strengthen industrial capacity in support of innovative companies. South Korea is no exception, and multiple strategies are in place to aid innovative development in the private sector. This study postulates that such national level strategies are applied differently depending on the innovation goal pursued by the service sector in Korea. We use data mining methods to test such research hypothesis. Factor analysis is used for clustering of various service companies, while association rule is used in finding the relationship per each cluster. The results show that national level strategies are underutilized and unequally distributed. This may be attributed to the disparity between the demand and needs of the private sector and the opinion of the government, which lead to underutilized and indistinguishable strategies.