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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 41, Issue 6 - Dec 2015
Volume 41, Issue 5 - Oct 2015
Volume 41, Issue 4 - Aug 2015
Volume 41, Issue 3 - Jun 2015
Volume 41, Issue 2 - Apr 2015
Volume 41, Issue 1 - Feb 2015
Selecting the target year
Usability Evaluation of the Touch Keys for the Smart Watch
Kim, Su Young ; Ban, Kimin ; Choe, Jaeho ; Jung, Eui S. ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 225~232
DOI : 10.7232/JKIIE.2015.41.3.225
The smart watch is the most popular wearable computing device because it takes a form of wristwatch. Many smart watches have adopted the touch screen interface due to the limited size of display. This paper focuses on touch key size and spacing that affect the usability about the touch key of smart watch. The experiments were made for four touch key sizes (width
) and nine touch key spacing (vertical
). The completion time, error rate, control discomfort and identification discomfort were measured. The touch key size
and the touch key spacing
provided the best results in terms of the completion time and the control discomfort, while the square touch key (
) provided the best performance for the error rate measure. The result of this study can help ergonomically design the touch interface of the smart watch.
Genetic Algorithms for a Multi-product Dynamic Lot-sizing and Dispatching Problem with Delivery Time Windows and Multi-vehicle Types
Kim, Byung Soo ; Chae, Syungkyu ; Lee, Woon-Seek ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 233~242
DOI : 10.7232/JKIIE.2015.41.3.233
This paper analyzes a multi-product inbound lot-sizing and outbound dispatching problem with multi-vehicle types in a third-party logistics distribution center. The product must be delivered to the customers within the delivery time window and backlogging is not allowed. Replenishing orders are shipped by several types of vehicles with two types of the freight costs, i.e., uniform and decreasing, are considered. The objective of this study is to determine the lot-size and dispatching schedules to minimize the total cost with the sum of inbound and outbound transportation and inventory costs over the entire time horizon. In this study, we mathematically derive a mixed-integer programming model and propose a genetic algorithm (GA1) based on a local search heuristic algorithm to solve large-scale problems. In addition, we suggest a new genetic algorithm (GA2) with an adjusting algorithm to improve the performance of GA1. The basic mechanism of the GA2 is to provide an unidirectional partial move of products to available containers in the previous period. Finally, we analyze the results of GA1 and GA2 by evaluate the relative performance using the gap between the objective values of CPLEX and the each algorithm.
Supply Chain Coordination Under the Cap-and-trade Emissions Regulation
Min, Daiki ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 243~252
DOI : 10.7232/JKIIE.2015.41.3.243
This paper considers a supply chain consisting of a manufacturer under the cap-and-trade emissions regulation and a permit supplier. We study joint production quantity and investment in reducing permit production cost decisions for centralized and decentralized supply chains. We formulate two supply chain contracts with aims to coordinate the decentralized supply chain; wholesale price contract and cost-sharing contract. Under the cost-sharing contract, the manufacturer shares a part of the investment in reducing permit production cost and then is allowed to purchase emission permit at a lower price. We analytically find that the proposed cost-sharing contract with reasonable parameters can coordinate the supply chain whereas the wholesale price contract is not desirable to achieve the system-wide profit. Numerical example is followed to support the analysis.
Development of a 3D Printing Open-market System for Copyright Protection and Remote 3D Printing
Kim, Sung Gyun ; Yoo, Woosik ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 253~258
DOI : 10.7232/JKIIE.2015.41.3.253
The 3D printing is any of various processes for making a three dimensional object of almost any shape from a 3D model. Recently, a rapidly expanding hobbyist and home-use market has become established with the inauguration of the open-source RepRap and Fab@Home projects. However, this causes problems regarding copyright protection and usage of illegal 3D data. In this paper, we developed a 3D printing open-market system, which guarantees copyright protection using the remote 3D printing without direct distribution of 3D design data. Because most of the home-use 3D printers are FFF (Fused Filament Fabrication) based on NC code system, open-market system uses FFF 3D printers. Also, open-market system inspects the uploaded 3D model data, so the system can prevent distribution of illegal model data such as weapons, etc.
Optimal LNG Procurement Policy in a Spot Market Using Dynamic Programming
Ryu, Jong-Hyun ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 259~266
DOI : 10.7232/JKIIE.2015.41.3.259
Among many energy resources, natural gas has recently received a remarkable amount of attention, particularly from the electrical generation industry. This is in part due to increasing shale gas production, providing an environment-friendly fossil fuel, and high risk of nuclear power. Because South Korea, the world's second largest LNG importing nation after Japan, has no international natural gas pipelines and relies on imports in the form of LNG, the natural gas has been traditionally procured by long term LNG contracts at relatively high price. Thus, there is a need of developing an Asian LNG trading hub, where LNG can be traded at more competitive spot prices. In a natural gas spot market, the amount of natural gas to be bought should be carefully determined considering a limited storage capacity and future pricing dynamics. In this work, the problem to find the optimal amount of natural gas in a spot market is formulated as a Markov decision process (MDP) in risk neutral environment and the optimal base stock policy which depends on a stage and price is established. Taking into account price and demand uncertainties, the basestock target levels are simply approximated from dynamic programming. The simulation results show that the basestock policy can be one of effective ways for procurement of LNG in a spot market.
Wafer Map Image Analysis Methods in Semiconductor Manufacturing System
Yoo, Youngji ; An, Daewoong ; Park, Seung Hwan ; Baek, Jun-Geol ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 267~274
DOI : 10.7232/JKIIE.2015.41.3.267
In the semiconductor manufacturing post-FAB process, predicting a package test result accurately in the wafer testing phase is a key element to ensure the competitiveness of companies. The prediction of package test can reduce unnecessary inspection time and expense. However, an analysing method is not sufficient to analyze data collected at wafer testing phase. Therefore, many companies have been using a summary information such as a mean, weighted sum and variance, and the summarized data reduces a prediction accuracy. In the paper, we propose an analysis method for Wafer Map Image collected at wafer testing process and conduct an experiment using real data.
A Daily Production Planning Method for Improving the Production Linearity of Semiconductor Fabs
Jeong, Keun-Chae ; Park, Moon-Won ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 275~286
DOI : 10.7232/JKIIE.2015.41.3.275
In this paper, we propose a practical method for setting up a daily production plan which can operate semiconductor fabrication factories more stably and linearly by determining work in process (WIP) targets and movement targets. We first adjust cycle times of the operations to satisfy the monthly production plan. Second, work in process (WIP) targets are determined to control the production progress of operations: earliness and tardiness. Third, movement targets are determined to reduce cumulated differences between WIP targets and actual WIPs. Finally, the determined movement targets are modified through a simulation model which considers capacities of the equipments and allocations of the WIPs in the fab. The proposed daily production planning method can be easily adapted to the memory semiconductor fabs because the method is very simple and has straightforward logics. Although the proposed method is simple and straightforward, the power of the method is very strong. Results from the shop floor in past few periods showed that the proposed methodology gives a good performance with respect to the productivity, workload balance, and machine utilization. We can expect that the proposed daily production planning method will be used as a useful tool for operating semiconductor fabrication factories more efficiently and effectively.
A Real Options Approach to Testing the Validity of Contribution to the Budget of the United States Forces Korea
Jeong, Weon Yeol ; Chae, Won Young ; Choi, Moon Sub ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 287~295
DOI : 10.7232/JKIIE.2015.41.3.287
Due to the latest agreement between the military authorities of the Republic of Korea (ROK) and the United States (US) of America, Korea's annual contribution to the budget of the United States Forces Korea (USFK) rose as high as close to 1 trillion won. This seemingly prohibitive amount has led to the questioning of military critics regarding determination criteria, wholesomeness of cost, alignment of incentives, and implementational transparency, etc. As these sources of mistrust can potentially undermine the congruence of alliance, we attempt to devise a scientific means to test the validity of Korea's budget contribution. Specifically, we use the real options approach (ROA) to estimating the interval of the fair prices of maintaining the USFK. We consider the USFK as an insurance against foreign incursions, and this enables us to assume their role as a put option. Upon a hypothetical war breakout, the daily cumulative size of the Korean economy is estimated by implementing the simulated loss ratios of assets and population. As a result, the strategic value (put premium) of the USFK is exponentially higher the sooner the US forces are augmented following an intrusion. Also, Korea's payments toward the USFK in 2011 and 2012 appear theoretically fairly valued.
Additional Vessel Traffic Services (VTSs) Location Problem for Maximizing Control Area Subject to Budget Limitation
Han, Junsoo ; Kim, Hyunwoo ; Jung, Seungeun ; Lee, Jinho ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 296~304
DOI : 10.7232/JKIIE.2015.41.3.296
Vessel Traffic Service (VTS) is the service that provides ships navigating on a sea transportation route with guidance and advice about geographical environment and other attentive information for their safety. In this study we point out that currently, constructing additional VTSs is required to prevent ships from unexpected accident on their navigation. We first select several candidate locations for constructing VTSs, based on the amount of marine transportation and its potential development possibility. Then, we present an optimization model in which the maximum area coverage is achieved by determining new locations of VTS subject to budget limitation. The problem can be modeled as a binary integer program and it provides an optimal solution for new VTS locations to be constructed under the consideration of the currently located VTSs in Korea.
Analysis of Current Situation and Relationship among National R&D Projects for Technology Convergence
Cho, Yangrae ; Yang, Iesuk ; Suh, Yongyoon ; Jeon, Jeonghwan ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 305~323
DOI : 10.7232/JKIIE.2015.41.3.305
Since various R&D projects about technology convergence was conducted by the government of Korea, the lack of liaisons among the projects has been accepted as serious issues related on the duplicated funding. In this article, we propose a research framework to analyze the relationship among national R&D projects about technology convergence. In detail, the projects have been sorted and categorized with the data collected from National Science and Technology Information Service (NTIS) in order to analyze the current state of national R&D projects. The linkages among projects are then established using the results of analysis on national R&D projects. Finally, the relationship maps have been developed. It is expected that the result could be applied to identify the relations among projects and handle problems on the duplicated funding.
Optimality of the Sole Sourcing under Random Yield
Park, Kyungchul ; Lee, Kyungsik ;
Journal of Korean Institute of Industrial Engineers, volume 41, issue 3, 2015, Pages 324~329
DOI : 10.7232/JKIIE.2015.41.3.324
Though the supplier diversification is considered as a vital tool to mitigate the risk due to supply chain disruptions, there are results which show the optimality of the sole sourcing. This paper further generalizes the results to show that the sole sourcing is optimal under very mild conditions. Discussion on why the sole sourcing is optimal is given with the insight on the value of supplier diversification.