• Industrial Engineering and Management Systems
• /
• 제9권3호
• /
• pp.227-241
• /
• 2010

A memory module industry's supply chain usually consists of multiple manufacturing sites and multiple distribution centers. In order to fulfill the variety of demands from downstream customers, production planners need not only to decide the order allocation among multiple manufacturing sites but also to consider memory module industrial characteristics and supply chain constraints, such as multiple material substitution relationships, capacity, and transportation lead time, fluctuation of component purchasing prices and available supply quantities of critical materials (e.g., DRAM, chip), based on human experience. In this research, a directed graph-based supply network planning (DGSNP) model is developed for memory module industry. In addition to multi-site order allocation, the DGSNP model explicitly considers production planning for each manufacturing site, and purchasing planning from each supplier. First, the research formulates the supply network's structure and constraints in a directed-graph form. Then, a proposed genetic algorithm (GA) solves the matrix form which is transformed from the directed-graph model. Finally, the final matrix, with a calculated maximum profit, can be transformed back to a directed-graph based supply network plan as a reference for planners. The results of the illustrative experiments show that the DGSNP model, compared to current memory module industry practices, determines a convincing supply network planning solution, as measured by total profit.

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
• /
• pp.1054-1056
• /
• 2017

액체로켓엔진의 성능 검증을 위한 시험발사체의 발사가 준비되고 있다. 액체로켓엔진의 비행시험은 막대한 비용과 준비가 필요하고 계측채널의 제한이 있음으로, 발사준비과정의 검사와 비정상상황 파악을 위하여 최적의 계측 계획이 수립되어야 한다. 본 논문은 해외 액체로켓엔진 비행시험 계측관련 자료를 조사하였는데, 근래에 들어 모든 가능한 결함을 지상시험단계에서 확인하여 제거하고자 하는 경향에 따라 비행시험 횟수가 줄고 있고 이에 반하여 비행시험 시 엔진의 측정 항목이 크게 증가하고 높은 측정 정확성을 요구하고 있다. 본 논문은 향후 국내에서 수행될 시험발사체 준비 및 발사 작업에 참고가 될 수 있다.

• 한국문헌정보학회지
• /
• 제38권2호
• /
• pp.49-74
• /
• 2004

본 연구에서는 한국과학기술정보연구원(KISTI)에서 지정하여 지원하고 있는 우리나라 과학기술분야 전문정보센터를 대상으로 정보서비스 체계 전반에 대한 현황 및 문제점을 분석$\cdot$파악하고 이를 토대로 최신의 정보기술을 반영$\cdot$적용한 우리나라 과학기술분야 전문정보센터의 효율적인 정보서비스 방안을 제시하였다. 이를 위하여 본 연구에서는 선행연구 분석, 설문조사, 해당기관 직접방문을 통한 관련자 면담, 해당기관 홈페이지의 관련 사이트 분석, 그리고 관련 전문가로 구성된 상시협의체의 회의를 통한 Brainstorming 방범 등을 병행하여 실시하였다.

• 한국문헌정보학회지
• /
• 제5권
• /
• pp.152-178
• /
• 1978

This has been designed for an attempt to survey a library use competency in order to provide basic information to plan more effective library use instruction for high school students. To get necessary data, a questionnaire was sent to 450 students in the 7 sample high schools in Seoul, and $80\%$ of them responded. The followings are the analysed results. 1. $42\%$ of them responded that they have heard about the decimal classification and $15\%$ of all the students have ever used decimal classification to search for the materials. 2. $3.6\%$ responded that they can understand the decimal classification and $66\%$ of all the students want to know about decimal classification. 3. $94\%$ responded that they have heard about the catalog cards and $41\%$ of all the students used catalog cards to search for the materials. 4. $29\%$ responded that they can understand the catalog cards and $68\%$ of all the students want to know about the catalog cards. 5. $61\%$ responded that they can use reference books. 6. $55.6\%$ responded that they know about the parts of a book. 7. $11\%$ responded that they can footnote. Reviewing the results of this study, library use competency of high school students can be said to be below level. And more effective approach is expected.

• 한국위성정보통신학회논문지
• /
• 제5권1호
• /
• pp.27-31
• /
• 2010

급증하는 주파수 수요를 해결하기 위해 최근 FCC(Federal Communications Commission)에서는 스펙트럼 사용 효율을 높이기 위해 주파수를 공유하는 CR(Cognitive radio)를 적용하기로 하였다. 그리고 이러한 CR 시스템을 LTE 시스템에 적용하고자 CR 기술 중 스펙트럼 센싱 이론을 LTE 환경에 적용을 시켜 실험을 하여 성능분석을 하였다. 본 실험에 있어서 LTE 하향링크 OFDMA (Orthogonal frequency division multiple access) 신호를 센싱했고, 채널은 가우시안 채널로 가정하여 실험을 하였다. 또한 실험에 필요로 한 임계값(threshold)은 5%, 10%로 달리 적용하여 성능분석을 하였다. 그리고 추후 LTE 시스템에 CR 시스템 적용을 위한 향후 연구 방향에 대하여 논의를 하였다.

• 한국실내디자인학회논문집
• /
• 제15권3호
• /
• pp.48-55
• /
• 2006

A sustainable building must produce an interior environment that is safe, healthy, comfortable and supportive of human performance and well-being. The medical human comfort: performance and productivity cost of unhealthy environment may cause much cost for healing. Research that buildings with daylight, fresh air, eco-materials and sustainable interior design are consistently rated as more comfortable and occupants performance, satisfaction and health. This study is to categorize systematically interior environmental design elements for improving sustainability with a view to developing an evaluation model of super high-rise apartment unit plans. With a literature survey and design guide lines concerning sustainable design elements, three hierarchical categorization levels of human, environment, energy and resources systems that consists of upper, middle, low design elements have been proposed. A total of 6 items have been suggested for middle level of categorization and 24 items for lower level. Finally a total of 107 design elements concerning the 24 items and their relationahips have been revealed. The needs for a systematic approach to interior environmental design for sustainability have been discussed.

• 한국안전학회지
• /
• 제26권5호
• /
• pp.105-109
• /
• 2011

Since a severe accident, which happens in low frequency, can cause serious damages, the interests in off-site consequence analysis for a nuclear power plant have been increased after Chernobyl, TMI and Fukushima accidents. Consequences, which are the effects on health and environment caused by released radioisotopes, are evaluated using MACCS II code based on the method of Level 3 PSA. To perform a consequence analysis for the reference plants, the input data of the code were generated such as meteorological data, population distribution, release fractions, and so on. Using these input data, acute and lifetime dose as an organ, CCDF for early fatalities and latent cancer fatalities, and average individual risk were analyzed by using MACCS II code in this study. These results might contribute to establishing accident management plan and quantitative health object.

• 한국안전학회지
• /
• 제26권5호
• /
• pp.99-104
• /
• 2011

An ILRT Interval for a nuclear power plant in Korea was extended from once in five years to once in ten years. Therefore, it is necessary to evaluate risk impact for ILRT interval extensions. In this paper, input data were generated for the reference plants, KSNP, using raw data such as meteorological data, population distribution data and source term data. And, using MACCS II code the risk impact assessment was performed based on the two methodologies of NUREG-1493 and NEI Interim Report. The risk impact derived from an ILRT interval extension was identified not to be significant. It is considered to apply this study and results to making an accident management plan and safety goal, and to the field of public acceptance.

• 정보관리연구
• /
• 제29권4호
• /
• pp.1-22
• /
• 1998

데이터베이스와 관련된 표준화는 기본 참조모델 설정을 통하여 크게 데이터베이스 일반, 데이터, 데이터베이스의 세가지 분야로 나누어 설명할 수 있다. 이러한 데이터베이스 국제표준화 활동은 현재 다양하고 적극적으로 추진되고 있는 상황이다. 이에 국내의 표준화 활동을 강화하기 위해 문헌정보 분야의 ISO/TC46과 데이터베이스 분야의 ISO/IEC JTC1/SC32의 활동현황을 분석하고 이와 관련하여 국내 전문위원회의 활동을 강화하여 추진할 수 있는 방안을 제시하였다. 또한 관련된 국내 데이터베이스 표준 제정기관의 실태를 조사하고 향후 개선 방향을 제시하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
• /
• 제20권1호
• /
• pp.15-26
• /
• 2014

Purpose: This study aims to suggest the architectural planning guidelines for the nurse area and patients' convenient facilities design of the wards in central public hospitals of the communities. Methods: In order to suggest architectural planning guidelines, expert's interview, field survey and analysis of the floor plan have been conducted in this paper. Results: This paper presents room configurations and space program, which determines the areas and structures of the spaces in the wards. Also it suggests the examples of floor plans which contains how to design nurse area and convenient facilities of the patient in the wards. Implications: The result of this research would be useful as a reference when the architect tries to design nurse area and convenient facilities of the patient of the wards.