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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Industrial Engineering and Management Systems
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Journal DOI :
Korean Institute of Industrial Engineers
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Volume & Issues
Volume 10, Issue 4 - Dec 2011
Volume 10, Issue 3 - Sep 2011
Volume 10, Issue 2 - Jun 2011
Volume 10, Issue 1 - Mar 2011
Selecting the target year
Visualized Preference Transition Network Based on Recency and Frequency
Masruri, Farid ; Tsuji, Hiroshi ; Saga, Ryosuke ;
Industrial Engineering and Management Systems, volume 10, issue 4, 2011, Pages 238~246
DOI : 10.7232/iems.2011.10.4.238
Given a directed graph, we can determine how the user's preference moves from one product item to another. In this graph called "preference transition network", each node represents the product item while its edge pointing to the other nodes represents the transition of user's preference. However, with the large number of items make the network become more complex, unclear and difficult to be interpreted. In order to address this problem, this paper proposes a visualization technique in preference transition analysis based on recency and frequency. By adapting these two elements, the semantic meaning of each item and its transition can be clearly identified by its different types of node size, color and edge style. The experiment in a sales data has shown the results of the proposed approach.
Single-Machine Total Completion Time Scheduling with Position-Based Deterioration and Multiple Rate-Modifying Activities
Kim, Byung-Soo ; Joo, Cheol-Min ;
Industrial Engineering and Management Systems, volume 10, issue 4, 2011, Pages 247~254
DOI : 10.7232/iems.2011.10.4.247
In this paper, we study a single-machine scheduling problem with deteriorating processing time of jobs and multiple rate-modifying activities which reset deteriorated processing time to the original processing time. In this situation, the objective function is to minimize total completion time. First, we formulate an integer programming model. Since the model is difficult to solve as the size of real problem being very large, we design an improved genetic algorithm called adaptive genetic algorithm (AGA) with spontaneously adjusting crossover and mutation rate depending upon the status of current population. Finally, we conduct some computational experiments to evaluate the performance of AGA with the conventional GAs with various combinations of crossover and mutation rates.
Expressions for Expectations and Variances of Cycle Times for Yard Cranes by Considering Dependencies among Time Elements
Lee, Byung-Kwon ; Kim, Kap-Hwan ; Yun, Won-Young ;
Industrial Engineering and Management Systems, volume 10, issue 4, 2011, Pages 255~263
DOI : 10.7232/iems.2011.10.4.255
During the design process of a terminal, the handling capacity of a container yard needs to be evaluated in advance. This study suggests formulas for estimating the expectations and the variances of cycle times for various types of operations of a yard crane. Statistical analysis is used to estimate the expectations and variances. The main focus of this study is to show the impact of interdependencies among handling time elements on the expectation and variance of the cycle times; these interdependencies have not been considered in previous studies. Numerical experiments are done for evaluating the difference in the variance of cycle times and the waiting of trucks between the cases with and without the consideration of interdependencies.
Development of a Computer Game "Ecopoly" for Education on Relationship between Environment and Economy
Komuro, Tasuya ; Matsumoto, Toshiyuki ;
Industrial Engineering and Management Systems, volume 10, issue 4, 2011, Pages 264~271
DOI : 10.7232/iems.2011.10.4.264
It is necessary for humans who have been facing environmental problems to build a sustainable society in which economic activities coexist with nature. To realize such goals, it is essential to promote and enhance environmental education, and to raise global awareness of environmental issues. As a preceding study, a board game "Ecopoly" based on the Kyoto protocol and the estate dealings game, was developed and the validity of environmental education was verified. This study further aims to develop a computer game "Ecopoly", based on the board game which enables us to learn the relationship between environmental problems and economic activities, and to learn more about environmental problems. This computer game enables to concentrate on it by automatic complicated calculations, and to get a higher visual effect compared with the board game. Experimental testing of the game was conducted with 13 college student subjects, and the validity of the game was verified.
Optimization of Decision Tree for Classification Using a Particle Swarm
Cho, Yun-Ju ; Lee, Hye-Seon ; Jun, Chi-Hyuck ;
Industrial Engineering and Management Systems, volume 10, issue 4, 2011, Pages 272~278
DOI : 10.7232/iems.2011.10.4.272
Decision tree as a classification tool is being used successfully in many areas such as medical diagnosis, customer churn prediction, signal detection and so on. The main advantage of decision tree classifiers is their capability to break down a complex structure into a collection of simpler structures, thus providing a solution that is easy to interpret. Since decision tree is a top-down algorithm using a divide and conquer induction process, there is a risk of reaching a local optimal solution. This paper proposes a procedure of optimally determining thresholds of the chosen variables for a decision tree using an adaptive particle swarm optimization (APSO). The proposed algorithm consists of two phases. First, we construct a decision tree and choose the relevant variables. Second, we find the optimum thresholds simultaneously using an APSO for those selected variables. To validate the proposed algorithm, several artificial and real datasets are used. We compare our results with the original CART results and show that the proposed algorithm is promising for improving prediction accuracy.
Resolution of Time and Worker Conflicts for a Single Project in a Max-Plus Linear Representation
Yoshida, Shotaro ; Takahashi, Hirotaka ; Goto, Hiroyuki ;
Industrial Engineering and Management Systems, volume 10, issue 4, 2011, Pages 279~287
DOI : 10.7232/iems.2011.10.4.279
This research develops a framework for resolving time and worker conflicts in the Critical Chain Project Management (CCPM) method, expressed in the form of a Max-Plus Linear (MPL) system. Our previous work proposed a method for resolving time conflicts. However, in practical cases, both time and worker conflicts may occur. Hence, we propose a method for resolving both time and worker conflicts for a single project. We first consider how to detect a resource conflict. Then, we define an adjacency matrix to resolve the detected conflicts. Using the proposed method, we confirm that the resource conflict can be resolved through a numerical example.
Improving In-Vehicle Display and Control Design for Older Drivers
Ryu, Jae-Heok ; Lee, Seong-Il ;
Industrial Engineering and Management Systems, volume 10, issue 4, 2011, Pages 288~291
DOI : 10.7232/iems.2011.10.4.288
Recommendations for older driver-friendly automobile interior design have been determined by taking into account older people's physical and cognitive characteristics. Twenty three older people (aged from 54 to 78) and five younger people (from 20 to 29) performed several tasks in actual driving conditions, in which their reaction times and performance errors were recorded. Some design factors were found to be related to older drivers' visibility and controllability. Several design recommendations were proposed in terms of cluster color and font, display location, and HVAC control type. Proposed recommendations are expected to satisfy a wider range of older drivers as these will facilitate automobile interior designs which are fitter to older drivers' visual, cognitive, and manual capabilities.