• 한국경영과학회지
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• 제16권2호
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• pp.118-127
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• 1991

In this paper, criteria and algorithms for the optimal service rate in a closed queueing network have been established. The objective is to minimize total cost. It is shown that system throughput is increasing concave over the service rate of a node and cycle time is increasing convex over the set of service times with a single calss of cubsomers. This enables developing an algorithm using a steepest descent method when the cost function for service rate is convex. The efficiency of the algorithm rests on the fact that the steepest descent direction is readily obtained at each iteration from the MVA algorithm. Several numerical examples are presented. The major application of this research is optimization of facility capacity in a manufacturing system.

• 한국재난정보학회 논문집
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• 제9권4호
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• pp.423-428
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• 2013

본 연구는 테러대응을 위한 일본 정부기관의 대응 방향을 살펴봄으로서 테러대응에 만전을 기하고 있는 우리에게 주는 그 함의는 무엇인지를 탐색하였다. 그 결과 첫째, 급조폭발물(IED)에 대한 대비책을 강구하여야 할 것이다. 둘째, 국내 자생 테러리스트의 상존 가능성을 검토하여야 할 것이다. 셋째, 중요시설의 안전도를 극대화하여야 할 것이다. 넷째, 범정부 차원에서 테러대응을 위한 대국민 홍보 교육이 이루어져야 할 것이다.

• 한국농공학회지
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• 제44권7호
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• pp.74-82
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• 2002

There are two major operation and management (O & M) systems in Korea, one by the Korea Agricultural and Rural Infrastructure Corporation (KARICO), a government corporation, and the other by non-KARICO, which includes Irrigation associations (IAs) and individual farmers under the supervision of city or county authorities. Main issues and constraints in the irrigation facility management are: (1) The dual system of the irrigation water management system; management by KARICO and that by IAs, and (2) From the commencement of KAICO in 2000, farmers were exempted from water charge. This is opposite to the international trend, which follows' user pay principle: Main specific strategies to improve irrigation management system are: (1) Introduction of water metering for water charge as well as water conservation, (2) Adoption of demand-oriented irrigation rather than supply-oriented to reduce waste of water, (3) To augment farmer's participation by forming water user associations, (4) To maintain consistency of government policy, (5) To promote roles of local governments, and (6) To reestablish the role of KARICO.

• 한국전자통신학회논문지
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• 제12권6호
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• pp.1151-1158
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• 2017

히트파이프 일체형 고효율 난방기는 겨울철 시설원예 내 작물생육에 필수인 난방장치와 배기열 회수기를 일체화하여 배기열이 외부로 배출되기 전 미사용 에너지를 재이용하는 장치이다. 시설원예, 유리온실 등 점검을 통해 우리나라 농업용 난방기의 문제점을 파악하였고, 개선방향을 찾아 시설원예 및 하우스에 맞는 최적화된 농업용 고효율난방기 및 스마트 제어시스템을 제안하였다.

• 한국환경보건학회지
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• 제30권4호
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• pp.329-343
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• 2004

We conducted to investigate citizen's attitude to the treatment of food waste in Yongin city. The respondent of $41.81\%$ throws the food waste eliminate from home and store less than 1l in Yongin. When they dump the food waste, they speak out the inconvenience of damaged envelope by animals in case of home and store. This caused troubles for reason of sanitary. So a local autonomous entity must carefully consider of expand use specially designed container as like apartment house. They give an answer that the collecting time of food waste is suitable form dawn till morning. This answer shows the satisfaction of the period time to collect the food waste. They prefer to be appointed the exclusive place to collect food waste. The service interval of collect is suitable 1 time a day. They want to increase the number of washing of the collecting container. This is good method for sanitary condition, but the care of the period time to collect the food waste is more efficient than the care of the number of washing the collecting container. The care of the period time minimizes to incur the enmity of the people and to pollute in environment. The major of respondent handled the food waste after keeping the basket or a kit. This fact shows to us almost citizen doesn't feel the seriousness to remove the moisture of the food waste. Recently, many solutions which can be disposal efficiently are getting magnified and improved owing to increase utilities channel to loss in quantities and dry the food waste. We expect the reduction of food waste is solved getting easily step by step. The results of the awareness about the facility of food waste show citizen prefer recycling facility to the other facilities. If recycle facility and incineration facility are constructed, they were worried about bed smell. When some facility of the food waste is constructed, they have to maintain and to handle not to incur the enmity of the people. The spread rate of specially designed container already increased, the citizen set a high value on the use of specially designed container more than amount-rate vinyl envelope that people have used for several years. In the cost treatment about food waste, the major respondent answered the use cost of specially designed container is suitable price. So we can know the use charge is proper level. The majority of citizen more prefer autonomous plan which voluntary atmosphere creation and public information by mass media than levy system and rising treatment cost which forced plan. The citizens have pretty positive thinking of incineration, so the government needs more efforts for a public notice, which includes the incineration is no more than abandoned thing. Each of local self government has to sort the food waste and make kind of resource system related to collecting and carrying, constructing a suitable facility, proper disposal of the food waste and producing harmless in our surrounding in order to solve the invisible problems. To do above mentioned things, we have to analyze referred several problems till now. Also, to minimize the side effect, the government will have to improve through enforce the system.

• 한국산학기술학회논문지
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• 제19권5호
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• pp.537-550
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• 2018

본 스마트시티의 개발초점은 점차 물리적 개발측면에서 공간적 개발측면으로 변화하고 있다. 공간적 개발의 주요적용 기술로는 환경기술(ET), 정보기술(ET), 그리고 환경기술과 정보기술이 융합된 환경 정보기술(ET+IT)이 있다. 그러나 스마트시티에 공간융합이 3가지의 기술들에 의해 변화 한다는 것은 아직까지 불투명하다. 따라서 본 연구는 스마트시티 공간(지구, 가로, 건물, 시설)의 융합 변화를 3가지 기술들을 통해 구체적으로 분석하는데 목적을 두고 있다. 주요연구 내용은 스마트시티에 융합된 환경기술, 정보기술, 환경 정보기술과 4개의 공간 사이의 융합 분포비율을 시기별(시기 1 : 1972~1999, 시기 2 : 2000~2009, 시기 3 : 2010~2017)로 파악하는 것이다. 그에 따라 연구결과는 다음과 같다. 첫째, 스마트시티 1기의 공간 적용개수와 융합 분포비율 합계는 지구(53개/43.0%)-건물(36개/29.1%)-가로(22개/17.9%)-시설(12개/10.0%) 순으로 높았다. 둘째, 스마트시티 2기의 공간 적용개수와 융합 분포비율 합계는 지구(223개/32.4%)-건물(197개/28.6%)-가로(195개/28.3%)-시설(74개/14.8%) 순으로 높았다. 셋째, 3기에는 4개의 공간 위계 중, 지구(467개/33%)가 가장 높았다. 그러나 1기, 2기와 다른 점은 가로(384개/27.4%)가 건물(361개/25.8%)보다 높았으며, 그 뒤로 시설(188개/13.4%)의 융합되고 있다. 넷째, 스마트시티는 1기와 2기 모두 적용개수와 융합비율에서 지구-건물-가로-시설 순으로 높은 결과 값이 나왔으나, 개수평균에서는 건물-가로-지구-시설 순으로 높았다. 3기에는 적용개수와 융합비율이 지구-가로-건물-시설 순으로 높았으며, 개수평균은 1,2기와 동일하였다. 결과적으로 스마트시티 공간(지구, 가로, 건물, 시설)은 초창기에 도시의 거시적 공간(항만, 공원, 녹지, 유원지, 공공공지, 수도전기, 열 공급시설, 하천, 궤도, 운하)의 개발을 통해 변화 되었다. 이후 지구 공간중심 개발과 스마트시티를 구축하는 중요한 건물(내부, 외부, 사이)공간에 다양한 디바이스/기술이 융합되어 시민유입을 목표로 변화하게 되었다. 건물공간은 계속해서 진화하고 있으며, 향후 스마트시티 공간은 완료된 건물과 건물을 연결하는 가로 공간으로 활성화 될 것이라 예상된다.

• 농업과학연구
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• 제29권2호
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• pp.135-148
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• 2002

In recent years, domestic market environment of rice production is confronted with the problems of excessive production and decrease in per capita consumption, resulting in steady decline of domestic rice price. Moreover, as new trade negotiations of WTO or FTA are being forwarded, cheap price of imported rice will also make the rice production environment being worse off. One of the possible production strategies to relieve this situation could be expanding farm size, which increases market competitiveness in terms of cost-saving. Since 1990's, one of the main agricultural policies for rice production in Korea has been expanding farm size. This study aims at 1)exploring brief history of Korean government's agricultural policy for expanding farm size, 2)examining economic effect of farming size expansion, and 3)discussing major role of government to promote appropriate programs for rice-farming and producers. Main conclusion suggests that appropriate farming size should be expanded upto at least five hectares per farm, with producers' effort to reduce farming costs and continuous investments on agricultural infrastructures including irrigation systems, etc. Continuous government's investment on operation and maintenance on water facility is also one of the important factors in expanding farm size.

• 천문학회보
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• 제35권1호
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• pp.39.1-39.1
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• 2010

We are developing a CCD camera named CQUEAN (Camera for Quasars in Early Universe) to search for quasars at z > 7. CQUEAN has a 1024*1024 deep depletion CCD chip and will be attached to 2.1m Otto-Struve Telescope at McDonald Observatory, USA. Although commercial software for the CCD camera is provided by the vendor, we are going to develop our own software to control the other instruments as well, to carry out efficient observation. There are four major parts in our software: Instrument control part controls the camera and filter wheel to obtain imaging data. Quick look window is to display acquired imaging data for quick inspection. Telescope control part interfaces with Telescope Control System (TCS) to move the telescope and to get time or coordinate information. Finally, Observation scripting facility part carries out a series of short exposures in a batch. The whole software will be written in python on linux platform, using the instrument control software libraries provided by the vendors.

• Nuclear Engineering and Technology
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• 제55권2호
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• pp.493-505
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• 2023

Comprehensive condition monitoring of large industry systems such as nuclear power plants (NPPs) is essential for safety and maintenance. In this study, we developed novel system-scale diagnostic technology based on deep-learning and IR thermography that can efficiently and cost-effectively classify system conditions using compact Raspberry Pi and IR sensors. This diagnostic technology can identify the presence of an abnormality or accident in whole system, and when an accident occurs, the type of accident and the location of the abnormality can be identified in real-time. For technology development, the experiment for the thermal image measurement and performance validation of major components at each accident condition of NPPs was conducted using a thermal-hydraulic integral effect test facility with compact infrared sensor modules. These thermal images were used for training of deep-learning model, convolutional neural networks (CNN), which is effective for image processing. As a result, a proposed novel diagnostic was developed that can perform diagnosis of components, whole system and accident classification using thermal images. The optimal model was derived based on the modern CNN model and performed prompt and accurate condition monitoring of component and whole system diagnosis, and accident classification. This diagnostic technology is expected to be applied to comprehensive condition monitoring of nuclear power plants for safety.

• 예술인문사회 융합 멀티미디어 논문지
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• 제8권7호
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• pp.929-943
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• 2018

주도적 주거유형이 공동주택단지로 자리잡아가며 현대사회에서 주거환경에 따른 커뮤니티의 문제가 중요한 이슈로 자리 잡고 있다. 그리고 이는 전통적 공동체의 붕괴와 이로 인한 사회적 문제의 양산으로 나타나기 시작한지 오래이다. 공동주택단지내 커뮤니티의 활성화를 위하여 다양한 논의가 지속되어 왔으며, 본 연구에서는 이를 위해 서울, 수도권, 지방대도시의 공동주택단지를 조사 분석하여 커뮤니티 시설의 모델을 제안하고자 하는 설계형 연구로서 도출한 결론은 다음과 같다. 공동주택 관련 법규에서 규정하고 있는 커뮤니티 시설 기준에 견주어 프로그램의 다양성에 있어서는 한계를 갖고 있는 것을 확인할 수 있다. 이는 점차 여가의 질의 향상을 기대하는 거주민의 만족도를 충족시키는데 한계로 나타나고 있으며, 물리적인 시설환경을 중심으로 기준화하고 있는 시설기준은 점차 질에 있어서의 요구가 증대하고 있는 가주민의 만족도를 높이는데 한계가 있으며, 이를 위해서는 시설기준의 다양성을 고려하는 접근이 선행되어야 할 것이다. 공동주택의 외부공간 이용성이 증대되고 있는 오늘날 커뮤니티시설의 지하공간을 활용하며, 건축적 요소를 통해 환경성을 확보하는 방안이 고려될 수 있으며, 이는 커뮤니티시설의 내·외부 공간의 이용성을 높이는데 장점을 갖는다.