• Journal of Electrical Engineering and Technology
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• 제13권3호
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• pp.1173-1184
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• 2018

The lifetime of a lithium-ion battery is one of the most important issues of the energy storage system (ESS) because of its stable and reliable operation. In this paper, the lifetime management method of the lithium-ion battery for energy storage system is proposed. The lifetime of the lithium-ion battery varies, depending on the power usage, operation condition, and, especially the selected depth of discharge (DOD). The proposed method estimates the total lifetime of the lithium-ion battery by calculating the total transferable energy corresponding to the selected DOD and achievable cycle (ACC) data. It is also demonstrated that the battery model can obtain state of charge (SOC) corresponding to the ESS operation simultaneously. The simulation results are presented performing the proposed lifetime management method. Also, the total revenue and entire lifetime prediction of a lithium-ion battery of ESS are presented considering the DOD, operation and various condition for the nations of USA and Korea using the proposed method.

• 한국경영과학회지
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• 제22권3호
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• pp.99-111
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• 1997

We consider a production system with post-operation and early set-up. As soon as there are no more units(raw materials) to process and the machine becomes idle, it undergoes a post-operation. After the post operation, if the number of waiting units is greater than or equal to m, it begins a set-up. After the set-up, if the number of units is greater than or equal to N($\geq$m), it begins to process the units. We first analyze the system by employing the decomposition property of the vacation queue. We, then, propose an algorithm that finds the optimal threshold values ($m^*$, $N^*$). Finally we present some numerical examples and interprete the system behavior.

• 대한안전경영과학회지
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• 제11권1호
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• pp.213-222
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• 2009

Two functions are considerable in the record management of policy management system operation. The first one is to prove that shows the conforming status of the management system requirements. The second one is to prove that shows the performing status whether the policy management system is operating effectively to the company. However, the second function requires the high level data analysis techniques, and it is more important for the decision making of the company operations. That is, the second function is more closer than the first function to the top manager's policy management tool. This paper is prepared to offer a study on the desirable record management which is necessary to the scientific decision making process. The scientific decision making requires the analysis of data derived from the reliable records. It is also aimed to enlighten the relations between the reliability of records and the adoption of the results of analysis in associated with the top manager's decision making.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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• pp.153-157
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• 1986

This paper describes the design of a monitoring system of automatic loom operation, which can provide valuable data for production and management by monitoring the operation of upto 512 looms.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2005년도 춘계공동학술대회 발표논문
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• pp.106-111
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• 2005

In nuclear power plant, the source of the energy is generated from the nuclear fuel rod. Given a certain level of consumption, the burnt fuel rod should be removed and replaced by a new(fresh) one. The burnt fuel is approximately one third of the whole fuel rods. Currently, this operation is done manually using paper documents and verbal communication and consumes a lot of operation time. In this study, we develop an computerized operation process of nuclear fuel rod replacement procedure based on the ERP(Enterprise Resource planning) methodology.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 D
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• pp.778-780
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• 1997

This study considers a hydro power energy operation management and planning problem in KEPCO power systems for efficient use of hydro resources. A database is developed to provide with a convenience to hydro Power operation management and Planning by studying of the hydro resourse characteristics of Korea. The data is obtained in the operation history from 7 years ago and by considering the hydro facility planning to 2010 year. Also a computer program is developed to decide the monthly required volume of water and the water level of a dam in the Han river using the database.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2004년도 품질경영모델을 통한 가치 창출
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• pp.513-516
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• 2004

Evolutionary operation is useful to improve on-line full-scale manufacturing processes by systematically changing the levels of the process variables while meeting production schedule. Evolutionary operation was developed using two or three process variables for process operators who are not good at statistics. Recently, when a product is developed, it is very important for the engineers to make the production line stable as soon as possible. And there are many causes which have influences to the product performance. This paper presents an evolutionary operation procedure with many process variables using saturated two level fractional factorial designs including Plackett-Burman design.

• 한국재난정보학회 논문집
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• 제9권4호
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• pp.484-492
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• 2013

연구는 재난 및 안전관리기본법 개정에 따른 재난안전 분야 종사자의 재난안전 교육훈련을 위해 체계적인 교육과정의 설계 및 운영에 대한 발전 방안 제시를 목적으로 한다. 재난 및 안전관리기본법 개정으로 재난안전분야 종사자의 재난교육 의무화가 요구되고 있으며, 기존의 교육과정 설계 및 운영의 발전 방안이 필요하다. 이를 위해 재난안전의 24개 기능과 재난 관리의 13개 역량 항목을 기초로 재난안전 분야 종사자를 재난관리자, 재난실무자, 재난지휘자로 구분하여 역량의 우선순위를 도출하고 교육수요를 파악한 후, 선진재난관리 요소와 과정의 브랜드화를 고려하여 재난안전분야의 교육훈련 과정 설계 안을 도출 하였다. 기본법 개정에 따라 교육기관의 교육과정의 전문화와 함께 교육 효과와 교육 수요자의 요구 사항을 고려, 참여형 교육훈련 기법을 반영한 교육 운영 형태를 포함한 발전 방안을 제시한다.

• 한국항해학회지
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• 제23권4호
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• pp.63-76
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• 1999

This paper aims at developing an integrated fleet management support system for industrial carriers who usually control the vessels of their own or on a time charter to minimize the cost of shipping their cargoes. The work is mainly concerned with the operational management problem of the fleet owned by a major oil company, a typical industrial carrier. The optimal fleet management problem for the major oil company can be divided into two phase problem. The front end corresponds to the production operation problem of the transportation of crude oil, the refinery operation, and the distribution of product oil to comply with the demand of the market. The back end is to tackle the fleet scheduling problem to meet the seaborne transportation demand derived from the front end. Relevant optimization models for each phase are proposed and described briefly. Then a user-friendly integrated fleet management support system is built based on the proposed optimization models for both ends under Windows environment. A case study reflecting the practices of fleet management problem for the major oil company is carried out by using the system.

• 경영정보학연구
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• 제8권1호
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• pp.223-239
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• 2006

디지털 경제 시대에 있어 정보시스템은 기업의 경쟁 우위 확보 차원을 넘어 생존의 차원에서 필요성을 인정 받고 있다. 기업은 신규 개발 또는 ERP 도입을 통해 정보시스템을 개발하고 이를 기반으로 사업을 추진하고 확장해야 하는 것이다. 그러나, 이러한 정보시스템의 성공적 운영에는 많은 현실적 문제가 있음을 인식해야 할 것이다. 특히, 중소기업의 경우 정보 시스템 운영 단계에서 많은 문제가 노출되어 운영에 차질이 생기거나 운영 자체를 포기하는 사례가 발생하고 있다. 본 논문은 중소기업의 성공적인 정보화 지속을 위해 효과적인 정보시스템 유지보수와 진화 관리를 위한 프레임웍을 제시하고자 한다. 사례 연구를 통해 설계된 프레임웍은 서비스 프레임웍, 감사 프레임웍, 위험관리 프레임웍 등으로 구성되어 있으며 중소기업의 정보화를 지속적으로 구현할 수 있는 정보시스템의 효과적인 운영 체제 구축에 활용될 수 있을 것으로 기대된다.