• 한국국방경영분석학회지
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• 제3권2호
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• pp.49-77
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• 1977

Weapon systems are curcial instruments for the security of a nation and critical elements for the victory in a war. Since modern weapon systems tend to be capital-intensive with high precision and quality, they become more and more complex and diversified; their acquisition costs become huge; and their technological obsolescence becomes accelerated. Therefore, the systematic management of weapon acquisition process would be one of the most important defense tasks at the national level. To analyze such problems and find solutions, this paper has studied various aspects related to the efficient management of weapon system acquisition. After brief summarization of the general characteristics of weapon systems, their effectiveness, and developmental trend, the paper discusses the defense management policies and techniques for the weapon systems. Specifically, four alternative acquisition methods such as indigenous R & D, foreign purchase, co-production and joint-production are discussed and analyzed by systems approach. The systems analysis procedure to evaluate and select weapon acquisition method is as follows; 1) to analyze the merits and demerits of the alternative methods, 2) to screen unrealistic alternatives through the consideration of significant factors such as political, economic, military, technological, and social constraints, 3) to evaluate and select an optimal one among the remaining acquisition methods after the cost-effectivenss analysis. For the base of cost-effectivess analysis, cost analysis model as well as effectiveness analysis model of each acquisition method are developed.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 춘계학술대회
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• pp.281-284
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• 2011

최근 유사석유제품 판매와 정량주유를 하지 않는 주유소로 인해 많은 운전자들이 피해를 입고 있고, 이러한 현상들이 점점 증가하여 앞으로 그 피해는 더 늘어날 전망이다. 유사석유제품을 사용함으로써 발생하는 피해는 연료계통의 윤활작용 및 자가 청정기능 문제, 부품의 조기 노후화 및 연료계통의 불순물 누적, 정품 휘발유와의 연소속도 차이로 인한 엔진의 부담 가중, 배기가스의 유독성물질 배출, 엔진오일과 확인되지 않은 화학적 반응 등이 발생하게 되는 문제점이 있다. 이러한 피해를 예방하기 위해 OBD-II 프로토콜로 자동차의 주행 내부정보를 받아 유사석유제품과 정량주유를 측정하고자 한다. 본 논문에서는 WinCe 기반의 개발보드를 이용하여 WiFi 통신을 지원하는 OBD-II 스캐너를 통해 주행 내부정보를 받아와서 현재 차량의 유사석유제품판별 시스템과 정량주유 시스템을 구현하였다.

• 건축역사연구
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• 제19권1호
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• pp.27-50
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• 2010

This paper was to analyze the fusion between the organic and inorganic characteristics performed in architecture and urbanism, especially on the characteristics found in the works of Archigram group who was very active during 1960s and 70s. Generally, it was thought that Archigram drew its ideas mainly from a mechanist metaphor and that the diagrams of its members were based on the notion of the material obsolescence, which could be placed in a British tectonic tradition. But, Archigram's works has been continually influenced by the biological-organic analogy from the birth of the group to its dissolution. Simply, the importance that the biological-organic analogy takes in the works of Archigram has changed periodically according to the change of its members. We can divide generally Archigram group in two parts : on one hand, nascent members such as Peter Cook, Dennis Greene, Michael Webb ; on the another hand, three members who participated from LCC such as Warren Chalk, Ron Herron, Dennis Crompton. As the new three LCC members participated, Archigram Group focalized on the technological part more than ever. But, when its members dispersed geographically and professionally, its biological-organic analogy came out again at the surface of their works. However, Archigram's organic and inorganic characteristics did not always adhere in opposing position with each other and took the form of coexistence in harmony at the same period. That is, the works of Archigram were persuing the creation of community that nature, technology and architecture could communicate and harmonize with each other through the intergration between organic and inorganic characteristics. The reason why Archigram became the one of the most excellent architectural avant-garde group in the 60s was mainly to receive asssitance with the fact that two small groups having contradictory tendencies got together and formed the Archigram group.

• 한국건설관리학회논문집
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• 제6권6호
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• pp.171-180
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• 2005

공공임대주택은 공공이 건설, 소유하고 관리하는 임대주택으로 사업주체는 건설부터 폐기처분에 이르는 전 과정을 관리하게 된다. 일반분양주택 사업주체가 초기투자비에 적극적인 관심을 보이는 반면, 공공임대주택 사업주체는 초기투자비와 더불어 건물의 유지보전을 위해 지출되는 수선비에 관심을 기울이지 않을 수 없다. 하지만 국내 공공임대주택의 수선비용은 단지 회계상의 지출요소로 관리되어 왔을 뿐, 체계적인 실태조사 및 분석에 대한 선행연구가 많이 부족한 실정이다. 따라서 본 논문은 공동주택 LCC모델링이나 수선비 예측모델의 신뢰성 향상 및 실무적 활용성 제고를 목적으로 공공임대주택에 지출된 수선비 실적자료를 바탕으로 통계적 방법을 활용, 경과연수와 지출비용과의 관계, 단지별 수선비 지출차이, 준공 후 시기에 따른 수선비 지출 경향에 초점을 맞추어 실태를 분석하였고, 단지별 수선비 지출격차가 발생하는 원인과 경과 연수에 따른 수선비 변화의 특성을 파악하여 제시하였다.

• Applied Microscopy
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• 제38권2호
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• pp.107-115
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• 2008

콩팥의 모세여과관문은 토리모세혈관, 내피세포, 혈관사이바탕질, 토리바닥막, 발세포로 구성되어 있다. 콩팥의 노화가 일어나게 되면 형태학적 변형이 일어난다고 보고되었는데, 그 중 흰쥐의 경우 생쥐나 사람보다 노화에 따른 토리의 형태가 다양하게 관찰된다는 보고가 있다. 하지만 이런 연구들은 대부분 단면 위주로, 형태변화에 관한 입체적인 연구는 부족한 실정이다. 본 연구에서는 3개월이 지난 성숙한 흰쥐와 24개월이 지난 노화 흰쥐의 토리 모세여과관을 비교하여 그에 따른 형태변화를 광학 및 투과전자현미경을 이용하여 관찰하였으며, 이러한 결과를 바탕으로 연속절편을 통해 컴퓨터 프로그램을 기반으로 한 3차원 재구성을 시행하였다. 그 결과 노화 흰쥐의 토리에서 요공간의 확장, 모세혈관 내피세포의 변형, 토리바닥막의 비대, 혈관사이바탕질의 확장을 관찰할 수 있었다. 또한 3차원 재구성을 시행한 결과 노화 흰쥐의 토리에서 바닥막 경계의 붕괴 현상, 발세포 핵막의 조각화와 분절 양상, 발세포 세포돌기의 부분적인 수축과 세포돌기의 가늘어짐으로 인한 여과틈새의 확장을 관찰할 수 있었다. 이상의 결과로 미루어 볼 때, 노화가 진행되면 토리의 여과관문의 변형으로 인하여 콩팥의 생리학적 역할과 조절이 영향을받을 것으로 사료된다.

• 한국문헌정보학회지
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• 제12권
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• pp.7-37
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• 1985

In most of the modern libraries throughout the world, it is popular to adopt the author number which arranges the books or entries in alphabetical order of their author's names within the same ultimate class. However, viewed historically, that was the Western practice never used in the East before. Traditionally chronological order was followed in the East. Book number not only individualizes the books within the same class but also makes it easy for the user to choose and find out the relevant materials. In this respect, chronological book number is decidedly superior to all kinds of book number systems ever have been existed. Especially in these days of rapid obsolescence of documents and with serious problems of storage of documents, the chronological order seems to be the most modern and future-oriented of all other book number systems because it distinguishes clearly new materials from aged materials by the date of publication and controls the stack spaces mechanically and effectively. This writer devised New Chronological Book Numbers adaptable to both the Eastern and Western materials, and the system has been adopted at Yonsei University Library. The features of the system are as follows: (1) It is easy to type the call number in cataloging the Eastern and Western materials. That is because the structure of the chronological number is pure numerical notation by taking the last two figures of the year within twentieth century(e.g. 85 for AD 1985), that is 1900s, and the last three figures of the year from twenty-first century to thirtieth century, that is 2000s. (2) It does not make all classes have chronological number uniformly. Within the classes for individual biographies, genealogies and collections of biography of specific family, books about individual organization, individual literary and artistic works, philosophical works of the famous philosophers, books and its facsmile editions published before 1900, new editions, translations, commentaries, serials, chronological number is assigned to the author number as in the past. (3) It separates the Eastern materials from the Western materials and makes the typing easy in cataloging. That is because the subarrangement within the same chronological book number is made by the accession order which uses 'panjol-ponmun' or the characters of basic syllabic table of Korean alphabet in case of the Eastern materials and Roman alphabet in case of the Western materials.

• 산업경영시스템학회지
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• 제41권1호
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• pp.50-58
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• 2018

Intermittent demand is a demand with a pattern in which zero demands occur frequently and non-zero demands occur sporadically. This type of demand mainly appears in spare parts with very low demand. Croston's method, which is an initiative intermittent demand forecasting method, estimates the average demand by separately estimating the size of non-zero demands and the interval between non-zero demands. Such smoothing type of forecasting methods can be suitable for mid-term or long-term demand forecasting because those provides the same demand forecasts during the forecasting horizon. However, the smoothing type of forecasting methods aims at short-term forecasting, so the estimated average forecast is a factor to decrease accuracy. In this paper, we propose a forecasting method to improve short-term accuracy by improving Croston's method for intermittent demand forecasting. The proposed forecasting method estimates both the non-zero demand size and the zero demands' interval separately, as in Croston's method, but the forecast at a future period adjusted by binomial weight according to occurrence probability. This serves to improve the accuracy of short-term forecasts. In this paper, we first prove the unbiasedness of the proposed method as an important attribute in forecasting. The performance of the proposed method is compared with those of five existing forecasting methods via eight evaluation criteria. The simulation results show that the proposed forecasting method is superior to other methods in terms of all evaluation criteria in short-term forecasting regardless of average size and dispersion parameter of demands. However, the larger the average demand size and dispersion are, that is, the closer to continuous demand, the less the performance gap with other forecasting methods.

• 한국전자통신학회논문지
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• 제9권6호
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• pp.681-687
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• 2014

원자력 산업계는 최근 원전 계측제어계통 설비의 단종과 같은 예상치 못한 환경에 직면해오고 있으며, 이러한 문제를 근본적으로 해결하고자 노력하고 있다. IAEA, IEC, 등의 연구결과에 따르면, FPGA는 단종이 예상되는 제어계통에의 대체수단으로 주목받고 있다. FPGA가 원자력 플랜트의 PLC(Programmable Logic Controller)를 대체하기 위해서는 높은 건정성과 신뢰성을 가져야 한다. 따라서, FPGA 기반 제어기의 건전성과 신뢰성을 향상시키기 위하여 HDL 개발수명주기를 적용하여 개발하였다. 또한, 원전 계측제어계통에 적용하기 위하여 번인시험과 환경시험의 기기검증이 수행되었다. 시험수행결과, 352시간의 번인시험과 92시간의 환경시험 중에 정상적인 기능 및 성능을 수행함을 확인할 수 있었다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.177-179
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• 2018

After Fukushima nuclear accident at 2011, nuclear industrial has been focused on operation and maintenance phase, not design and construction phase. Continued good operating performance of nuclear power plants has been the best critical issue to nuclear utilities. Replacement for complete components as well as parts of components is being procured because nuclear utilities must maintain safety and reliability of operating nuclear power plants. However, many suppliers and manufacturers are giving up a nuclear quality assurance program under reduction in new construction of nuclear power plants. It is able to be increased difficulty in procuring spare parts to support operations and maintenance of nuclear power plants. Over 20% of nuclear power plant equipment in some countries is obsolete. Owing to obsolescence of nuclear safety-related items and/or withdrawing a nuclear quality assurance program of suppliers and manufactures, some replacement item and part might be procured to the item not covered by appendix B to USNRC 10 CFR Part 50. Under various methods of the nuclear repair and replacement methodology, utilities are supposed to establish a typical program for a repair and replacement of an electrical equipment and its parts in conjunction with a nuclear quality assurance. Concerning this typical program, this study suggests the repair and replacement methodology of electrical equipments used in nuclear power plants by procurement of a power supply, based on nuclear regulations, codes, standards, guidelines, specific and general technical information, etc..

• 한국산학기술학회논문지
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• 제8권6호
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• pp.1458-1464
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• 2007

현재 국내 외 제조 산업은 기업 시스템의 노후화 등의 많은 문제들이 발생하고 있다. 현재의 자동차 부품공장에서의 불량품에 대한 처리방법은 제품의 생산이 완료된 후 테스트 단계를 거쳐 양품과 불량품을 분류하고 불량품이 발생하면 생산을 중단하고 생산라인의 상태를 점검하는 방식이다. 본 연구에서는 자동차 부품공장의 생산라인에서 불량품 생산을 줄이고 생산라인 가동시간의 지연을 줄이기 위한 생산성 향상을 위한 모니터링 솔루션에 대해 제안한다. 생산성 향상을 위한 모니터링 솔루션은 제품 조립의 각 단계마다 테스트를 통해 데이터를 수집하고, 수집한 데이터에서 불량이 예상되면 알람기능을 이용해서 경고를 하도록 설계하였다. 경고 메시지를 통해 불량이 예상되는 곳에 대해 조기에 조치하여 불량품이 나올 확률을 최소한으로 하고 제품의 생산지연 시간을 줄이는 것을 목표로 한다.