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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 10, Issue 3 - Nov 1997
Volume 10, Issue 2 - Jul 1997
Volume 10, Issue 1 - Mar 1997
Selecting the target year
Shift Scheduling in Semiconductor Wafer Fabrication
Yea, Seung-Hee ; Kim, Soo-Young ;
IE interfaces, volume 10, issue 1, 1997, Pages 1~13
Capacity Planning and Control of Probe Process in Semiconductor Manufacturing
Jeong, Bong-Ju ; Lee, Young-Hoon ;
IE interfaces, volume 10, issue 1, 1997, Pages 15~22
In semiconductor manufacturing, the probe process between fabrication and assembly process is constrained mostly by the equipment capacity because most products pass through the similar procedures. The probe process is usually performed in a batch mode with relatively short cycle times. The capability of the probe process can be determined by the optimal combination of the equipments and the products. A probe line usually has several types of equipment with different capacity. In this study, the probe line is modeled in terms of capacity to give the efficient planning and control procedure. For the practical usage, the hierarchical capacity planning procedure is used. First, a monthly capacity plan is made to meet the monthly production plan of each product. Secondly, the daily capacity planning is performed by considering the monthly capacity plan and the daily fabrication output. Simple heuristic algorithms for daily capacity planning are developed and some experimental results are shown.
A Simulation-Based Decision Support System for Operations of Etching Workstations
Shin, Yong-Ho ; Seo, Jeong-Won ; Lee, Tae-Eog ; Hahn, Ik-Hwan ; Choi, Cheol ;
IE interfaces, volume 10, issue 1, 1997, Pages 23~35
A Neural Network Approach for Wafer-lot Batching
Sung, Chang-Sup ; Choung, You-In ; Yoon, Sang-Hum ;
IE interfaces, volume 10, issue 1, 1997, Pages 37~45
Determination of an Economic Lot Size of Color Filters in TFT-LCD Manufacturing
Jeong, Bong-Ju ; Sohn, So-Young ;
IE interfaces, volume 10, issue 1, 1997, Pages 47~55
This paper deals with an assembly process of the TFT glasses and the color filters in LCD manufacturing. Two specific problems are presented and solved. One is a matching problem to find the best matches between a set of TFT glasses and a set of color filters, which result in the maximum number of good LCD assemblies. A simple mathematical model is constructed for this problem and an optimal solution can be obtained using an existing algorithm. The other is a main problem that requires a determination of an economic lot size of the color filters which are going to be assembled with a given set of TFT glasses. A Bayesian dynamic forecasting model is developed to predict the defective patterns of color filters. Based on the predicted defective rate of color filters, the minimum lot size of the color filters can be determined to minimize the probability of losing good TFT glasses and color filters.
Inter-loop Stocker Automated Material Handling Systems
Jo, Min-Ho ;
IE interfaces, volume 10, issue 1, 1997, Pages 57~65
Less researches on AGV(Automated Guided Vehicle) path configurations have been conducted so far while more studies have been placed in determining AGV guide path directions and pick-up/drop-off station locations, and routing/dispatching/scheduling strategies. In practice plenty of concerns fall in preventing deadlock and simplifying AGV system control through an appropriate AGV path configuration. In order to meet those requirements, a new AGV path configuration, inter-loop stocker type is introduced here. The stocker serves as relaying material between loops as well as stocking material. Automated material handling systems using AGVs play an important role in semiconductor industry including TFT LCD and memory/non-memory chip. A practical example of implementing the inter-loop stocker concept successfully in the TFT LCD fab is presented in this paper.
Quality Engineering in Semiconductor Manufacturing with Emphasis on Patterning and Thin Film Forming Processes
Yum, Bong-Jin ; Kim, Kil-Soo ; Lee, Pal-Hun ; Park, Yang-Gil ; Kim, Seong-Jun ;
IE interfaces, volume 10, issue 1, 1997, Pages 67~77
The Comparison and Use of Yield Models in Semiconductor Manufacturing
Park, Kwang-Su ; Jun, Chi-Hyuck ; Kim, Soo-Young ;
IE interfaces, volume 10, issue 1, 1997, Pages 79~93
Application of Experimental Design Technics to Optimization Using Simulators : A case study
Tong, Seung-Hoon ; Rhee, Dae-Young ;
IE interfaces, volume 10, issue 1, 1997, Pages 95~107
Total Quality Management of Semiconductor Manufacturing
Ree, Sang-Bok ; Hwang, Young-Hun ; Kang, Suk-Ho ;
IE interfaces, volume 10, issue 1, 1997, Pages 109~117
Inventory Control Policies for a Hospital Blood Bank: A Simulation and Regression Approach
Suh, Jeong-Dae ;
IE interfaces, volume 10, issue 1, 1997, Pages 119~134
The management of blood inventory is very important within the medical care system. The efficient management of blood supplies and demands for transfusions is of great economic and social importance to both hospitals and patients. For any blood type, there is a complex interaction among the optimal inventory level, daily demand level, daily supply level, transfusion to crossmatch ratio, crossmatch release period, issuing policy and the age of arriving units that determine the shortage and outdate rate. In this paper, we develop an efficient decision rule for blood inventory management in a hospital blood bank which can support efficient hospital blood inventory management using simulation. The primary use of the efficient decision rule will be to establish minimum cost function which consists of inventory levels, period in inventory, outdate and shortage rate for whole blood and various component inventories for a hospital blood bank or a transfusion service. If the administrator compute the mean daily demand for each blood type, the mean daily supply for each blood type, the length of the crossmatch release period and the average transfusion to crossmatch ratio, then it is possible to apply the efficient decision rule to compute the optimal inventory level, inventory period, outdate and shortage rate. This rule can also be used as a decision support system that allows the blood bank administrator to do sensitivity analysis related to controllable blood inventory parameters.
Development of an Operating Software for Educational DNC System
Seo, Ki-Sung ;
IE interfaces, volume 10, issue 1, 1997, Pages 135~143
The importance of training for NC, CNC and Machining Center has been greatly increased. This paper presents implementation of a DNC(Direct Numerical Control) operating software for educational system. This system is able to connect 8-32 CNCs to Control PC with RS232 multi-port serial card. Therefore, it allows much efficiency in training even after costs are considered. The KISCO DNC S/W for above system includes various communication functions, communication parameters setting, program editor and user-friendly environment. This software was developed with C and Windows programming. It was proved in function and stability by iterative field tests.
Simulator-Based Mental Workload Assessment of the In-Vehicle Navigation System Driver Using Revision of NASA-TLX
Cha, Doo-Won ; Park, Peom ;
IE interfaces, volume 10, issue 1, 1997, Pages 145~154
In developing the HMI(Human-Machine Interface) evaluation system for the IVNS(In-Vehicle Navigation System), design guidelines and evaluation methods are the most crucial problems for its use and efficiency. As the part of this system, focused on the final product of the database, subjective mental workload assessment is seriously considered to evaluate the driver's own driving task using the IVNS. This paper suggests the methodology for the ergonomic assessment of the IVNS that corresponds to the subjective measurement of the driver's mental workload by rating his or her own driving task. For this approach, Revision of NASA-Task Load Index(RNASA-TLX) was developed which translated and revised the version of NASA-TLX that is generally accepted an efficient and powerful method for evaluating the in-vehicle information systems. To verify the RNASA-TLX, an experiment was conducted in a real road situation, because the result of the laboratory approach is uncertain and has the differences from the real road test.
Development of the Process Planning Program for a Multi-functional Surface Mounting Device
Sohn, Jin-Hyeon ; Yu, Sung-Yeol ; Kang, Jang-Ha ; Park, Sung-Soo ; Oh, Byung-Jun ; Seong, Pil-Young ;
IE interfaces, volume 10, issue 1, 1997, Pages 155~167
The purpose of this study is to develop the program for efficient operation of a multi-functional surface mounting device(SMD) which mount various components on a printed circuit board(PCB). These components are provided by diverse types of feeders such as cassette, stick and tray feeders. The SMD has one or two heads. In the SMD, the positions of PCB and feeders and fixed, and the head moves to pick up a component from a feeder and to mount it on the PCB. The number of lanes occupied by each feeder and the nozzle used for each component can be different. We develop an off-line program to minimize the cycle-time of the SMD by studying the optimal assignment of feeders and the optimal mounting sequence of components. Graphical User Interface(GUI) is also developed. Additionally, we consider the line balancing problem which appears when two SMDs are used sequentially.
Design and Implementation of Group Decision Support System using Object-Oriented Modeling Technique
Kim, Soung-Hie ; Cho, Sung-Sik ; Kim, Sun-Uk ; Park, Hung-Kook ;
IE interfaces, volume 10, issue 1, 1997, Pages 169~187
Recently, in organizations many decisions are being made by groups. And the organization is changing a lot so are groups. To help decision making of changing groups, we need more flexible and more adaptive GDSS. Therefore one of the critical success factors of GDSS is flexibility and incremental improvement. Prior research on specifying design requirements of GDSS suggests generic design requirements. But they are too general to be incorporated directly into system design, because of the disparity between real group and ideal group that the researchers studied. Many design strategies that start from the generic design requirements thus have contingency variables that changes as the characteristics of group change. From the viewpoint of developers, these variables implicate the desirability of flexibility. To achieve flexibility we need new methodology of design and implementation. Nowadays, object-oriented analysis and design methodologies have been progressed to the point that many systems are being developed through these methodologies. In this paper, a design is proposed using Object-Oriented Modeling Techniques(OMT). Exploiting object-oriented paradigm results in a highly flexible and easily upgradable design.
Generation of Erection Sequence in Shipbuilding Process Planning
Hong, Yoon-Gee ; Jung, Eun-Kyung ; Jun, Jin ; Kim, Se-Young ;
IE interfaces, volume 10, issue 1, 1997, Pages 189~207
This paper explains a way of describing the erection sequence using the connecting relationship among blocks of a hull in shipbuilding industry. The information of the adjacent blocks such as upper, lower, right, left, front, rear, and their erection status, etd., is defined and the proper use of this allows us to determine one of the possible erection sequences. The methodology suggested also includes some useful benefits of avoiding insert blocks or maintaining stability in erection process. Further, an algorithm for generating the initial erection network is shown and this network may be a basis for designing daily erection scheduling. Some examples illustrate the procedure developed in this study and the results support the model's fidelity.
An automaticity indicator computation and a factory automation procedure
Cho, Hyun-Bo ; Jeong, Ki-Yong ; Lee, In-Bom ; Joo, Jae-Koo ; Lee, Joo-Kang ; Jeon, Jong-Hag ;
IE interfaces, volume 10, issue 1, 1997, Pages 209~222
The paper provides a methodology to obtain the automaticity indicator of a factory and the sequence of enabling technologies of factory automation. The automaticity indicator is the measure of the current automation status of a factory and can be used as a crucial criteria for the future automation schedule and investment. Although most industries have their own computation methods which usually consider the number of workers in the shop floor, this research covers five evaluation items of automation, such as, production facility, material transfer system, inspection and test system, information system, and flexibility. The detailed evaluation models are developed for each item. Automation sequencing prioritizes the enabling technologies of factory automation on the basis of several criteria which consist of two phases. The first phase includes the automation indicator and the second phase includes six sub-criteria such as production rate, quality, number of workers, capital investment, development duration, development difficulty. For this evaluation, AHP(Analytical Hierarchy Process) is introduced to prevent the decision maker's subject intention. As results of the automaticity indicator and automation sequence, the manager can save time and cost in building constructive and transparent automation plans.
Evaluation of Tool Paths and NC Codes Generation for PCB Drilling Operations
Choi, Hoo-Gon ; Lee, Ho-Chan ; Seo, Jun-Sung ;
IE interfaces, volume 10, issue 1, 1997, Pages 223~235
The process of determining the optimal tool path in PCB(printed circuit board) drilling operations is identical with that of solving a TSP(traveling salesman problem). However, the optimal solution will be ruined when a drill bit needs tracking back in its tool paths. The back tracking occurrences shorten a life of the main spindle and result in inaccurate mechanical movements. In this study, the performances of four heuristics(Nearest Neighbor, Convex Hull, Greatest Angle and Most Eccentric Ellipse) are evaluated to obtain feasible tool paths along with less number of back trackings for a large number of holes(more than 2000holes/bit) and to generate corresponding NC codes for a given CNC drill. Also, the operations of these algorithms are visualized to show a user the graphic image of tool visitation with PCB holes on a computer screen.
Economic Analysis of Power Plant Utilities Under
Kim, Ji-Soo ; Lee, Byoung-Nam ; Kim, Tae-Jin ;
IE interfaces, volume 10, issue 1, 1997, Pages 237~248
The purpose of this study is to make an economic analysis of power plant utilities by examining electricity generating costs with environmental consideration. Economic growth has caused pollutant emission, and subsequent environmental pollution has been identified as a very real limit to sustainable development. Considering the enormous role of electricity in the national economy, it is thus very important to study the effect of environmental regulations on the electricity sector. Because power utilities need large investments during construction, operation and maintenance, and also require much construction lead time. Economic analysis is the very important process in the electric system expansion planning. In this study, the levelized generation cost method is used in comparing economic analysis of power plant utilities. Among the pollutants discharged of the electricity sector, this study principally deals with the control activities related only to
, since the control cost of
, and TSP (Total Suspended Particulates) is already included in the construction cost of utilities. The cost of electricity generation in a coal-fired power plant is compared with one in an LNG combined cycle power plant. Moreover this study surveys the sensitivity of fuel price, interest rate and carbon tax. In each case, this sensitivity can help to decide which utility is economically justified in the circumstance of environmental regulations.