• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2000년도 춘계학술대회
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• pp.427-434
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• 2000

본 연구에서는 품질기능전개(QFD)를 품질전개, 기술전개, 원가전개, 신뢰성전개로 구분하여 각 단계에서 실무적으로 고려해야 할 중요한 사항을 제안한다. 품질전개에서는VOC로 J.D.Power사의 시장품질조사 방법을 활용할 것을 제안하며 기술전개에서는 새로운 SPC 공정도와 작업표준 작성방안을 제안한다. 끝으로 신뢰성 전개에서는 BOM의 구조분석과 RBD, FTA 통합기능분석, FMEA의 체계적인 정리 등의 3단계 전개방안을 제안한다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2006년도 춘계공동학술대회 논문집
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• pp.1641-1646
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• 2006

This paper deals with a physical access network design problem arising from the deployment of fiber-to-the-home passive optical networks (FTTH-PON). The problem seeks to find an optimal location and capacity assignment of splitters in the network such that the total cost of fiber and splitter is minimized, while satisfying all the demand. We propose tabu search approach for finding a good feasible solution.

• 산업공학
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• 제11권1호
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• pp.41-53
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• 1998

The Korean government has made efforts to establish ITS (Intelligent Transport System) strategic plans and to implement ITS. Commercial Vehicle Operation (CVO) has been developed in Korea as one of five subsystems in ITS and also in the context of Integrated Logistics Information Systems (ILIS). A low-level strategic plan of CVO is fixed on October, 1997, which has two subsystems and six major services. In this paper, services, requirements and information technologies for CVO are introduced as well as operational tests, deployment cases and cost-effectiveness.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2015년도 추계학술발표대회
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• pp.19-20
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• 2015

대용량 분산처리시스템과 전산자원 가상화를 토대로 소프트웨어 정의 데이터센터(SDDC) 구현 기술이 광범위하게 연구되고 오픈소스로써 발표되고 있다. 이에 더하여, 성능과 용량이 비약적으로 발전된 commodity hardware는 분산처리와 가상화에 최적의 조건이 됨은 물론, 기존 플랫폼의 한계를 극복하고 글로벌 클라우드가 표방하는 각종 편의성을 자체 구현 할 수 있는 기회를 주기도 한다. 이에 따라, 지속가능하면서 비용효율적인 컴퓨팅 플랫폼 구축 모델을 제시하고자 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권7호
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• pp.1230-1251
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• 2011

This document specifies a new IPv6 deployment protocol called CHANC, which stands for Configuring Hosts to Auto-detect (IPv6, IPv6-in-IPv4, or IPv4) Network Connectivity. The main part is an application level tunneling protocol that allows Internet Service Providers (ISPs) to rapidly start deploying IPv6 service to their subscribers whom connected to the Internet via IPv4-only access networks. It carries IPv6 packets over HTTP protocol to be transmitted across IPv4-only network infrastructure. The key aspects of this protocol are: offers IPv6 connectivity via IPv4-only access networks, stateless operation, economical solution, assures most firewall traversal, and requires simple installation and automatic configuration at customers' hosts. All data packets and routing information of the IPv6 protocol will be carried over the IPv4 network infrastructure. A simple application and a pseudo network driver must be installed at the end-user's hosts to make them able to work with this protocol. Such hosts will be able to auto-detect the ISP available connectivity in the following precedence: native IPv6, IPv6-in-IPv4, or no IPv6 connectivity. Because the protocol does not require changing or upgrading customer edges, a minimal cost in the deployment to IPv6 service should be expected. The simulation analysis showed that the performance of CHANC is pretty near to those of native IPv6, 6rd, and IPv4 protocols. Also, the performance of CHANC is much better than that of D6across4 protocol.

• 산업경영시스템학회지
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• 제39권2호
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• pp.138-149
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• 2016

Quality function deployment (QFD) is a widely adopted customer-oriented product development methodology by translating customer requirements (CRs) into technical attributes (TAs), and subsequently into parts characteristics, process plans, and manufacturing operations. A main activity in QFD planning process is the determination of the target levels of TAs of a product so as to achieve a high level of customer satisfaction using the data or information included in the houses of quality (HoQ). Gathering the information or data for a HoQ may involve various inputs in the form of linguistic data which are inherently vague, or human perception, judgement and evaluation for the information and data. This research focuses on how to deal with this kind of impreciseness in QFD optimization. In this paper, it is assumed as more realistic situation that the values of TAs are taken as discrete, which means each TA has a few alternatives, as well as the customer satisfaction level acquired by each alternative of TAs and related cost are determined based on subjective or imprecise information and/or data. To handle these imprecise information and/or data, an approach using some basic definitions of fuzzy sets and the signed distance method for ranking fuzzy numbers is proposed. An example of a washing machine under two-segment market is provided for illustrating the proposed approach, and in this example, the difference between the optimal solution from the fuzzy model and that from the crisp model is compared as well as the advantage of using the fuzzy model is drawn.

• 한국정보통신학회논문지
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• 제11권4호
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• pp.846-851
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• 2007

산불감시와 같이 광범위하고 험난한 지역에 대한 감시 시스템으로써 무선 센서 네트워크는 가장 경제적이고 현실적인 방안의 하나이다. 그러나 센서 노드의 저전력 소모 필요성으로 인하여 센서노드간 통신 가능거리가 짧아 해당 지역에 설치되어야 하는 센서노드의 수는 수만개에 이른다. 본 논문에서는 센서 노드의 설치와 수명이 다한 센서노드를 대체하기 위한 재설치 문제를 고찰하고 분석하였다. 동적 설치로 인해 발생될 수 있는 감시 불능 영역에 대한계산의 필요성과 향 후 해결방안에 대하여 제시하였다. 한편, ZigBee무선 통신 프로토콜을 사용하여 센서 노드간 거리 변화와 지형이나 숲과 같은 장애물 여부에 따른 노드 간 패킷 수신율을 실험을 통해 측정하고 분석하였다.

• 전기학회논문지
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• 제64권2호
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• pp.228-231
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• 2015

In power system research fields, one of current key issues is the construction and commercialization of micro grid site which is called green island, carbon zero island, energy independent island, building micro grid, etc. and various affiliated technologies have been being vigorously developed to realize. In addition, various researches about electric vehicles (EVs) are in progress and it is expected to penetrate rapidly with the next a few years. Some new load models should be developed integrating with electric vehicle loads because the EVs' deployment could cause the change of load composition rate on power system planning and operations. EVs are also resources for micro grid as well as distributed generation and demand response so that various supply and demand side resources should be considered for micro grid researches. In this paper, the load composition rate of residential sectors is prospected considering the deployment of EVs and the resource configuration of micro grid is optimized based on net present cost. In the optimization, the load patten of case studies includes EV's charging characteristics and various cases are simulated comparing micro grid environment and normal condition. HOMER is used to compare various cases and economic effects.

• 한국컴퓨터정보학회논문지
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• 제19권2호
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• pp.11-19
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• 2014

본 논문에서는 노후화된 NT 서버를 중심으로 서버 통합 가상화를 구축하고 이에 따른 효과 분석을 통해 다음과 같은 결과를 제시하였다. 첫째, 다수의 물리적인 서버를 가상화 통합 서버에 탑재하여 전산 데이터 센터의 상면공간확보로 인한 항온항습기의 효율 증가를 얻을 수 있었다. 둘째, 노후화된 대형서버의 가상화 탑재로 전력 사용량 감소 및 신규 서버도입에 따른 추가 하드웨어 도입감소로 전산데이터센터 유지비용과 신규 자원 도입에 따른 비용 절감 효과를 도출할 수 있었다. 상면 절감 효과는 89%, 전력과 냉방 소비량은 기존 대비 79% 정도 절감 효과를 얻었다. 이러한 NT 서버 통합 가상화는 현재 뿐만 아니라 추후에도 전산센터의 유지보수 비용을 주는데 기여하고 Green-IT로의 변화를 기대 할 수 있다. 본 논문에서 적용한 가상화 서버 통합 구축 방법은 UNIX 계열 및 기타 다른 서버군을 통합 할 때도 동일하게 적용할 수 있다.

• Journal of Information Processing Systems
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• 제3권1호
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• pp.8-15
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• 2007

Grid environments provide the mechanism to share heterogeneous resources among nodes. Because of the similarity between grid environments and P2P networks, the structures of P2P networks can be adapted to enhance scalability and efficiency in deployment and to search for services. In this paper, we present a membership management based on a hierarchical ring which constructs P2P-like Grid environments. The proposed approach uses only a limited number of connections, reducing communication cost. Also, it only keeps local information for membership, which leads to a further reduction in management cost. This paper analyzes the performance of the approach by simulation and compares it with other approaches.