• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.12
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• pp.2453-2461
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• 2009

Faults caused by medium-voltage customers have been increased and enlarged their portion in total distribution faults even though we have done many efforts. In the previous paper, we suggested the fault prediction model and fault prevention method for these distribution line faults. However we can't directly apply this prediction model in the field. Because we don't have an useful program to predict those customers causing distribution line faults. This paper presents the construction method of data warehouse in ERP system and the program to find customers who cause distribution line faults in medium-voltage customer's electric facility management applying data mining techniques. We expect that this data warehouse and prediction program can effectively reduce faults resulted from medium-voltage customer facility.

• Korean Management Science Review
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• v.11 no.1
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• pp.91-106
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• 1994

In mixed model assembly lines, products are assembled seqeuntially that have different combination of options specified by customers. In just in time (JIT) environment, production smoothing becomes an important issue for sub-lines which supply the necessary parts to each workstation of the assembly line. Another important issue is to avoid line stopping caused by work overload in workstations. To find a sequence which minimizes the costs associated with line stoppage and the option parts inventory level, a nonlinear mixed integer programming is formulated. Recognizing the limit of the Branch and Bound technique in large sized problems, a heuristic solution procedure is proposed. The performance of the heuristic is compared with the Branch and Bound technique through randomly generated test problems. The computational results indicate that on the average the heuristic solutions deviate approximately 3.6% from the optimal solutions.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.1287-1290
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• 2005

This paper represents an conceptual design for the on-line EMS(Energy Management System) database using object-oriented concept. By using object-oriented concept, EMS can meet on-line control operation.

• International Journal of Quality Innovation
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• v.2 no.1
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• pp.30-49
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• 2001

This paper considers a recent environment in the manufacturing process in which data in large amounts can be obtained on-line in real-time. Under this environment an on-line real-time Statistical Process Control (SPC) scheme equipped with detection of a process change, change-point estimation, and recognition of the change pattern is proposed. The proposed SPC scheme is composed of a Cusum chart, filtering methods and Akaike Information Criterion (AIC). We examine the performance of this scheme by Monte Carlo simulation and show its usefulness.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.642-646
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• 2006

This is a study on I/O materials management system of production line. They usually use bar code in existing materials management systems but there we many difficult factors. If RFID technic is applied to I/O materials management system, we can manage information of materials efficiently, and save time and cost by decreasing works. In this paper, for I/O materials management system of production line, I/O materials management system, warehousing processor, deiver processor, raise processor, material requirement processor and processor, Also we verify these processors in a point of user view.

• Journal of Korean Society of Archives and Records Management
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• v.8 no.2
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• pp.127-152
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• 2008

This article focuses on analyzing the cases of on-line archival contents services of the national archives' web-sites and explaining their types and characteristics. This study defines the concept of on-line archival contents services through literature review. Then, it examines the cases of on-line archival contents provided by web-sites of the USA, the UK, Australian and Korean national archives. The types of on-line archival contents services are classified in accordance with the main purpose of use, the structure, and the way of interaction between contents and users. Lastly, it summarizes their structural and thematic characteristics by type and country.

• Journal of Korea Society of Digital Industry and Information Management
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• v.7 no.3
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• pp.137-150
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• 2011

Long-term customer retention strategies with switching cost is very important for gaining a competitive advantage in on-line shopping mall environment. The purpose of this study is to investigate the affecting factors of switching cost in terms of on-line shopping mall's quality and the effects of it on customers' behavior moderating commitment. According to the result, information quality and customized information were found to be significantly related to social switching cost, and also royalty program and product differentiation were found to be significantly related to lost benefit cost and procedural cost respectively. When it comes to the relationship between switching cost and commitment, results shows that social switching cost is not significantly related to affective commitment. Lost benefit cost and procedural cost, however, were found to be significantly related to affective commitment and calculative commitment respectively. Finally, affective commitment was found to bolster repurchase intention and control negative WOM, and calculative commitment was found to bolster both repurchase intention and negative WOM.

• Transactions on Electrical and Electronic Materials
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• v.7 no.2
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• pp.90-95
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• 2006

An on-line diagnostic test has been studied and performed for the pumped storage generator/motor. This study aims at reducing the diagnostic cost, minimizing the technical dependency on third party manufactures. Further design of on-line diagnostic system such as shorted-turn of rotor winding, partial discharge (PD) of stator winding and air-gap between stator and rotor for pumped storage generator/motor has been verified. In addition, it needs to be validated on site performance of the developed continuous on-line monitoring system for corresponding tasks for the improvement of the availability & reliability during operation.

• Journal of the Korea Safety Management & Science
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• v.6 no.2
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• pp.11-21
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• 2004

Objectives: The aim of this study is to determine prevalence and related factors of musculoskeletal symptoms in electronics assembly line workers. Method: A questionnaire survey was performed on 350 workers in In-chon city. The questionnaire consisted of questions on the general characteristics, work duration, working hours, hobby activity hours, housekeeping activity hours and standardized descriptions of NOISH on musculoskeletal symptoms. Result: Complaint rates of musculoskeletal symptoms by anatomical site were as follows: shoulder, 67% : neck, 40.4% : waist, 28.7% : wrist and hand, 27.1% : foot and leg, 14.4% : arm and elbow, 11.2%. Significantly higher prevalence of shoulder musculoskeletal symptom was found women than men, married than unmarried, less than 1hours housekeeping activity than over 1hours housekeeping activity. Multiple logistic regression analysis identified gender, marital status and housekeeping activity as the main affecting factors for shoulder musculoskeletal symptoms. Conclusions: The most prevalence of musculoskeletal symptoms was shoulder site. It was higher in married women and over 1hours housekeeping activity in a day. It is recommended that married women should be reduce housekeeping activity time.

• Journal of Korean Society for Quality Management
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• v.20 no.2
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• pp.11-20
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• 1992

We discuss the feed back control of the on-line QC in the Taguchi method. Taguchi(1982) used the assumptions that the quality characteristics follow an uniform distribution and the Brownian motion to draw the loss function and proposed ${\Delta}/3$ or ${\Delta}$ for the initial control limit. Adams and Woodall(1989) also proposed a different procedure but using the same loss function. We propose, in this paper the new loss function under the assumption of mainly Brownian motion and compare the results with the results of the above.