• 한국조경학회지
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• 제30권4호
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• pp.28-36
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• 2002

The main purpose of this study was to estimate a new regression model to explain the relationship between urban forest and air temperature in summer, 2001. This study consists of two parts: correlation coefficient analysis and regression analysis. According to correlation coefficient analysis, thermal infra-red radiations of the major land use categories found significant difference in each category. However there were no significant relationship between the data (thermal infra-red radiation and NDVI) derived from Landsat-7 ETM+ image and air temperature at Automatic Weather Stations(AWSs). After estimating various regression models for summer air temperature, the final models were chosen. The final regression models consisted of two variables such as forest m and traffic facilities area. The regression models explained over 78% of the variability in air temperatures. The regression models with variables of forest area and traffic facilities area showed that the coefficient of the first variable was even more significant than the second one. However, the negative impact of the traffic facilities area was slightly greater than the positive impact of the forest area. Consequently, the effects of forest area and traffic facilities area were apparent to explain summer air temperature in Seoul. Therefore two policies have the most important implications to mitigate the summer air temperature in Seoul: to expand and to conserve the urban forest; and to change the Oafnc facilities'characteristics. The results from this study are expected to be useful not merely in informing the public that urban forest mitigates summer air temperahne, but in urging the necessity of budgets for trees and managing urban forests. It is recommended that field swey of summer air temperature be Performed for the vadidation of the models. The main purpose of this study was to estimate a new regression model to explain the relationship between urban forest and air temperature in summer, 2001. This study consists of two parts: correlation coefficient analysis and regression analysis. According to correlation coefficient analysis, thermal infra-red radiations of the major land use categories found significant difference in each category. However there were no significant relationship between the data (thermal infra-red radiation and NDVI) derived from Landsat-7 ETM+ image and air temperature at Automatic Weather Stations(AWSs). After estimating various regression models for summer air temperature, the final models were chosen. The final regression models consisted of two variables such as forest m and traffic facilities area. The regression models explained over 78% of the variability in air temperatures. The regression models with variables of forest area and traffic facilities area showed that the coefficient of the first variable was even more significant than the second one. However, the negative impact of the traffic facilities area was slightly greater than the positive impact of the forest area. Consequently, the effects of forest area and traffic facilities area were apparent to explain summer air temperature in Seoul. Therefore two policies have the most important implications to mitigate the summer air temperature in Seoul: to expand and to conserve the urban forest; and to change the traffic facilities'characteristics. The results from this study are expected to be useful not merely in informing the public that urban forest mitigates summer air temperature, but in urging the necessity of budgets for trees and managing urban forests. It is recommended that field survey of summer air temperature be Performed for the vadidation of the models.

• 한국산학기술학회논문지
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• 제18권11호
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• pp.740-746
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• 2017

함정의 추진기와 발전기에 의해 발생하는 고온의 폐기가스와 연돌 주변 금속표면에서 방사되는 적외선 신호는 적 위협 무기체계의 표적이 되어 함의 생존성을 감소시키는 주 원인이 된다. 폐기가스와 연돌의 적외선 신호는 함정에 적외선 신호저감 장치(Infra-Red Signature Suppression system, IRSS)를 설치하여 감소시키고 있다. IRSS는 폐기가스에 난류 유동을 형성하는 이덕터, 폐기가스와 주변 공기가 혼합되는 믹싱 튜브, 외기와의 압력차를 이용하여 공기 필름을 형성하는 디퓨져 세 부분으로 구성된다. 본 연구는 적외선 신호저감 장치를 국내 독자기술로 개발하기 위한 기초 연구로 국외 선진 기술사에서 개발하여 국내 함정에 설치된 IRSS의 모형시험 조건을 분석하고 이를 기반으로 열 유동해석 연구를 수행하였다. 열 유동해석에서는 상용 수치해석 프로그램을 사용하였으며, 다양한 난류 이론 모델을 고려하여 결과를 비교 분석하였다. 해석의 주요 결과로는 이덕터 입구와 디퓨져 출구에서의 폐기가스 온도 및 속도, 그리고 디퓨져의 금속표면 온도를 구하였으며 모형시험의 계측 결과와 잘 부합함을 확인하였다.

• 한국산학기술학회논문지
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• 제18권12호
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• pp.793-798
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• 2017

현대의 함정에서는 추진 기관에서 생성된 고온의 폐기가스와 가열된 폐기관의 금속표면온도를 저감하기 위해 적외선 신호저감 장치(Infra-red Signature Suppression system, IRSS)를 설치하고 있다. 국내 함정에 탑재된 일반적인 IRSS는 이덕터, 믹싱튜브 그리고 디퓨져로 구성되며, 이 중 디퓨져는 금속표면에 내기 외기의 압력차에 의한 공기 막을 생성시켜 온도를 저감시키는 역할을 한다. 본 연구에서는 국외 선진 기술사에서 설계한 IRSS의 디퓨져 형상을 분석하여 설계 변수를 선정하였으며, 분석 조건을 줄이면서 설계 변수의 특성을 효과적으로 파악 할 수 있는 다구치 실험계획법을 통해 IRSS 디퓨져의 성능에 영향을 미치는 설계 변수의 특성을 검토하였다. 디퓨져의 성능분석에는 선행 연구에서 정립한 열 유동해석 기술을 활용하였다. IRSS의 성능평가에는 함정 적외선 신호의 세기와 직접적으로 관련되는 디퓨져 출구에서의 폐기가스 온도와 금속표면온도의 면적평균 값을 기준으로 하였으며, 폐기가스의 온도는 디퓨져 출구의 직경 변화에 크게 영향을 받고, 디퓨져 금속표면의 온도는 디퓨져 링의 개수 변화에 크게 영향 받음을 확인하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제11권1호
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• pp.43-54
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• 2005

This study is a second paper of the re-structuring strategies of healthcare facilities in Kwang-ju and Jeon-nam province for it's competition power in the emerging global health care market. Kwang-Ju city and Jeon-nam province have had difficulties in building a balanced healthcare system because of rapidly declining population, weakened healthcare infra-structure and geographical problems of healthcare supply by numerous islands. This paper presents the new approaching process for re-building healthcare network in the regional healthcare facilities planning. In addition, it analyzes health planning index, healthcare system, the concept of health care networking, etc. Finally, this presents the case study of regional healthcare facilities planning in Kwang-ju city and Jeon-nam Province.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.608-615
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• 2022

Construction projects are large-scale projects that require extensive construction costs and resources. Especially, scheduling is considered as one of the essential issues for project success. However, the schedule and resource management are challenging to conduct in high-tech construction projects including complex design of MEP and architectural finishing which has to be constructed within a limited workspace and duration. In order to deal with such a problem, this study suggests resource and sequence optimization using constraint programming in construction projects. The optimization model consists of two modules. The first module is the data structure of the schedule model, which consists of parameters for optimization such as labor, task, workspace, and the work interference rate. The second module is the optimization module, which is for optimizing resources and sequences based on Constraint Programming (CP) methodology. For model validation, actual data of plumbing works were collected from a construction project using a five-minute rate (FMR) method. By comparing actual data and optimized results, this study shows the possibility of reducing the duration of plumbing works in construction projects. This study shows decreased overall project duration by eliminating work interference by optimizing resources and sequences within limited workspaces.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.280-284
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• 2002

최근 Workflow System의 컴퍼넌트화는 필수적인 것으로 인식되고 잇다. 컴퍼넌트화의 장점으로는 유지, 보수의 용이성과 다른 어플리케이션과의 원활한 통합을 들 수 있고, 컴퍼넌트 기반의 Workflow System은 e-business infra를 형성하는데 필수적이다. 따라서 본 연구에서는 기업 내부의 포로세스를 관리해 주는 Workflow System을 컴퍼넌트형태로 설계하여 가장 진보된 형태의 Workflow System의 기반을 마련한다. 본 논문에서는 RUP방법론에 다라 use case분석, class diagram분석을 통해서 DISFlow(Daewoo Information Workflow)를 EJB Architecture에 맞게 변환하였다.

• 한국정보처리학회논문지
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• 제4권12호
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• pp.3097-3110
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• 1997

초고속 통신망의 구축과 컴퓨터 기술의 발전으로, 컴퓨터 기술과 통신망이 통합된 정보통신 인프라 (Infra-structure)를 객체 지향 소프트웨어 구조의 시스템으로 모델화한 개방형 정보 통신망 구조위에서 멀티미디어 서비스를 제공하는 연구 활동이 활발히 전개되고 있다. 본 논문에서는 멀티미디어 서비스의 기본이 되는 화상 회의 서비스를 선정하여, 개방형 정보 통신망 구조에서 서비스 세션 관리 기능을 객체 모델링 하였다. 또한 화상 회의 서비스를 통하여 서비스 세션 객체와 물리적 통신망을 제어하는 연결 관리 객체간 접속을 세션 그래프와 연결 그래프로 개념화 하였으며, 이들 간의 세션 관리 객체 모델링과 매핑 및 객체 정보 공유에 대한 기술을 검증하였다.

• 한국군사과학기술학회지
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• 제20권6호
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• pp.767-773
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• 2017

Infrared stealth is an important technology for naval ships. This technology helps improve the anti-detection performance and survivability of naval ships. In general, the infrared signature of naval ships are categorized into internal and external heat source. External signature are generated by ship surface heating by solar flux as well as the complicated heat transfer process with the surrounding weather condition. Modern naval ships are equipped with seawater injection nozzles on the outside for nuclear, biological and, chemical, and these nozzles are used to control external signature. Wide nozzle placement intervals and insufficient injection pressure, however, have reduced seawater dispersion area. To address this problem, nozzle installation standards must be established. In this study, an actual-scale experimental system was implemented to provide the evidence for nozzle installation standards in order to reduce the infrared signature of naval ships. In addition, the environmental conditions of the experiment were set up through computational fluid dynamics considering the ocean climate data and naval ship management conditions of South Korea. The dispersion distance was measured using a high-resolution thermography system. The flow rate, pipe pressure, and dispersion distance were analyzed, and the evidence for the installation of seawater injection nozzles and operation performance standards was suggested.

• 한국정보처리학회논문지
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• 제6권3호
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• pp.729-741
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• 1999

ATM networks are widely deployed as the network that is capable of supporting multimedia services efficiently now. To date, a large portion of ATM connections, particularly in the WAN environment, have been of a permanent virtual circuits-requiring management intervention for set-up and tear-down. However, switched virtual circuits are required to support a range of desired characteristics on demand, to a reachable end user. To establish, maintain and release on-demand call/connections, the user-network interface(UNI) and node-node interface(NNI) signalling capabilities are required. Two protocols have been specified for NNI signalling within a public network: the broadband integrated-services user part(B-ISUP) protocol specified by the ITU-T, and the private network-network interface(PNNI) protocol specified by the ATM Forum. PNNI offers different type of internetwork or internodal interface from the traditional B-ISUP approach favored to date public network operators. In spite of its name, PNNI may find its place in network service provide networks as well as in private networks. Thus many public network operators and ATM equipment manufacturers are still unable to choose the NNI interface architecture of their system. In this paper, we survey the characteristics of the B-ISUP and PNNI protocols, and investigate the applicability issue of these specifications to the ATM-based Information Infra-Network of Korea. Analyzing the characteristics of the two protocols and clarifying the NNi requirements of the ATM-based Information Infra-Network of Korea, we propose that the B-ISUP protocol is more suitable than PNNI.

• 대한예방한의학회지
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• 제13권3호
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• pp.19-28
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• 2009

Background : Recently, Medical Act was amended to encourage the induction of combined treatment between Oriental Medicine doctors and Western doctors. As yet, the information infra for combined treatment has not been studied. Objectives : This study aimed to design the architecture of information system for combined treatment of the Oriental and the Western Medicine. Methods : First, we defined the information of combined treatment through the analysis of research trends from the inside and outside of the country. Because the data compatibility is very important, the definition of information must be ahead of anything else. Second, we designed the architecture of information system based on the prior definition. Results : We classified the information for combined treatment by subject such as law, clinic, research, manpower, facilities, and education. In this paper information system examined in three aspects. First the infra layer is organized as hardware, netware, and security. Second is data warehouse layer for the storing, filtering, and extraction of data. Third is service layer which is related to data transmission. And Finally all information for combined treatment is provided through the portal system for medical consumer, political planner, and R&D researcher. Conclusion : In this paper, we studied the essential factors of combined treatment information in the view point of information system. But the detailed design and implementation of information system must be followed to effect this results.