• Journal of Advanced Marine Engineering and Technology
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• 제30권1호
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• pp.140-149
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• 2006

Characteristics of a laminar diffusion flame placed near wall in microgravity have been numerically analyzed in a two-dimension. The fuel for the flame is $C_2H_4$. The flame is initiated by imposing a high temperature ignition source. The flow field, temperature field, and flame shape in microgravity diffusion flame are detailed. Especially, effects of surrounding air velocity and fuel injection velocity on the microgravity diffusion flame have been discussed accounting for standoff distance. And, the effect of curvature rate has been also studied. The results showed that velocities in a diffusion flame were overshoot because of volumetric expansion and distribution of temperature showed regularity by free-buoyancy This means that the diffusion flame in microgravity is very stable, while the flame in normal gravity is not regular and unstable due to buoyancy. Standoff distance decreases with increase in surrounding air velocity and with decrease in fuel injection velocity. With increasing curvature rate, the position of reaction rate moves away the wall.

• 한국산학기술학회논문지
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• 제13권1호
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• pp.412-418
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• 2012

본 논문은 원인천의 중심이었던 경인선 동인천역 및 동인천역세권을 대상으로 20세기 도시성장에 따른 원인천의 쇠퇴와 함께 불합리한 민자역사 개발로 낙후된 지역을 재활성화하기 위하여, 철도에 의해 양분된 지역생활권의 단절 해소 및 철도시설 연변부지의 효율적 토지이용을 통한 입체적인 철도 환승시스템을 제안함과 동시에 철도 이용객의 편의를 도모하며 기존 지역상권의 복원 및 활용을 통한 지역활성화 방안을 모색하는 것에 있다.

• Molecules and Cells
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• 제44권11호
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• pp.781-783
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• 2021

• 한국실내디자인학회논문집
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• 제24권6호
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• pp.212-220
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• 2015

The study aims to identify the design character of libraries today into outwardness which enhances publicity in the library buildings. This design trend tends to be emphasized in contemporary civic libraries. In these days, the libraries become not only to be the traditional places of information but also to be the multi-purpose places to provide community services and cultural spaces. Thus the contemporary libraries, especially big civic libraries, are willing to open to the public of diverse purposes and to accelerate social communication among them through outward design in the buildings. This study surveys literatures and identify accessibility, symbolism, openness, amenity, connection, as the characters of publicity in the libraries. The study also examines the outward design strategies of the libraries which enhance publicity in the ways of design to connect surrounding environment, to symbolize buildings, to wrap transparent external surfaces and to build interior spaces. The study finds in the case studies of ten outstanding civic libraries abroad which were built in relatively recent years that the outward design is achieved mainly through four ways. First, the libraries have connection with surrounding urban environment, thus have continuities from the surrounding. Second, the libraries have the shapes of landmarks which expose themselves and their roles to the outside. Third, the libraries have transparent surfaces through which outdoor environment penetrates into the buildings. Fourth, the libraries have corridors and halls which look like traditional urban public streets and plazas. The study concludes that outward design strategies which employ in contemporary libraries enhance publicity in the libraries. Thus the libraries can perform as multi-functional cultural and open places which accelerate social interactions among the public of cities. This study has the value as a research which emphasizes outwardness as the design strategies which enhance publicity in contemporary libraries.

• 한국멀티미디어학회논문지
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• 제11권4호
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• pp.544-553
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• 2008

통상적인 센서 네트워크는 센서노드로부터 고정된 정보를 수집하는 일괄적인 방식을 사용한다. 하지만 이러한 방식은 헬스케어 환경에서 주요 센싱대상인 사람의 상태와 위치변화, 주변 환경의 변화에 능동적으로 대처하기 어렵다. 헬스케어 환경을 지원하기 위해서는 사람의 상태와 주변상황의 변화에 따른 특정정보를 제공해주어야 한다. 또한 사람의 이동에 따른 네트워크 타입의 변화에 대처하여야 한다. 본 논문에서는 대표적인 다중 에이전트 미들웨어인 Agilla 모델과 주변노드간의 클러스터를 구성함으로써 네트워크의 효율성을 보장하는 LEACH 프로토콜에 대해 분석한다. 이 분석 결과를 기반으로 기존 LEACH 프로토콜의 취약점인 노드 이동성을 보장하는 LEACH_Mobile 프로토콜을 제안한다. 또한 노드의 동적 기능변경을 지원하는 Mobility Agent Middleware와 LEACH_Mobile 라우팅 모듈을 구성요소로 이동노드의 동적 기능변경을 지원하는 Mobility Agent 모듈을 설계한다. 그리고 LEACH_Mobile 프로토콜의 시뮬레이션 결과를 통해 네트워크의 데이터 전송 성공률에 대한 성능 향상을 보여준다.

• 융합경영연구
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• 제12권2호
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• pp.51-60
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• 2024

Purpose: The purpose of this study was to analyze the factors influencing the housing satisfaction of the new middle-aged who returned to farming to derive the implications of real estate policies to resolve regional imbalances. Research design, data and methodology: As a result, this study used secondary data, housing survey data, and identified factors influencing housing satisfaction through multiple regression analysis as well as basic analysis such as exploratory factor analysis, reliability analysis, technical statistics analysis, and correlation analysis. Previous studies, in particular, mainly focused on aging, retirement, economic activity, and retirement preparation, but this study was able to derive predictive factors that can increase the persistence of living after returning to farming by analyzing housing satisfaction for the new middle-aged, and as a result, suggest implications for resolving regional imbalances. Results: As a result of the analysis, it was found that housing structure status had the greatest influence among the three factors of housing-related predictors: housing structure status, facility accessibility, and surrounding environment, suggesting that policy alternatives that can improve the quality of the housing structure itself should be prepared rather than facility accessibility and the surrounding environment. Conclusions: Based on these results, we discussed implications for improving the housing structure to increase the continuity of living for the new middle-aged after returning to farming, and presented follow-up research directions on the need for complementary research in addition to individual analysis of influencing factors, limitations of secondary data, and the lighting of research on the new middle-aged and other generations who did not return to farming.

• 한국환경생태학회지
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• 제25권2호
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• pp.145-155
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• 2011

본 연구는 2004년부터 2008년에 걸쳐 강원도 자연환경연구공원 내 산림 및 주변 산림지역을 대상(조사구역 I: 호수 및 주변 수변생태계, 조사구역II: 인가 및 주변 산림생태계, 조사구역Ⅲ: 산림생태계)으로 육상 포유동물의 종다양성과 분포현황 및 변화양상을 조사한 것이다. 본 연구 동안 멸종위기종인 하늘다람쥐, 수달, 삵 등이 연구지역 내에 서식하고 있는 것을 확인하였다. 포유동물의 종다양성은 인가 접경 산림인 조사구역II보다는 수변지역인 조사구역I과 산림지역인 조사구역III에서 다양도가 더 높은 경향을 보였다. 종다양성의 변화는 2006년에 다소 증가했으나 2007년부터 미세하게 감소하기 시작했다. 그러나 종수의 미세한 감소와는 달리 개체수는 2007년부터 매우 크게 감소하는 경향을 보였다. 따라서 연구지역 내 산림에서 포유류의 종다양성과 개체수를 일정하게 유지하기 위한 방안을 마련할 필요가 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.149.5-149
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• 2001

The robot soccer simulation game is a dynamic multi-agent environment. In this paper we suggest a new reinforcement learning approach to each agent´s dynamic positioning in such dynamic environment. Reinforcement learning is the machine learning in which an agent learns from indirect, delayed reward an optimal policy to choose sequences of actions that produce the greatest cumulative reward. Therefore the reinforcement learning is different from supervised learning in the sense that there is no presentation of input-output pairs as training examples. Furthermore, model-free reinforcement learning algorithms like Q-learning do not require defining or learning any models of the surrounding environment. Nevertheless ...

• 한국환경복원기술학회지
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• 제13권3호
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• pp.114-127
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• 2010

This study aimed at reviewing the case examples of environmental assessment of development projects within management zones, identifying problems and improvement opportunities and suggesting the direction of environmental assessment for management zones that are increasingly segmented Findings showed that first, the assessment of environment soundness in management zones must incorporate the national land environmental map and wide-area ecological axes established by the Ministry of Environment. Second, regarding development activities in management zones, rather than an issue of simply destroying natural environment in a development site itself during a development period, an issue of permanently isolating ecosystems from surrounding areas in a mid/long-term perspective and continually polluting water in mid-stream/upstream regions where sites are located must be considered. Third, in the case of development projects with vast areas, existing plant communities will be disturbed and the naturalness of vegetation will gradually decline due to foreign tree species introduced for landscape architecture. Therefore, creating buffer forests at forest boundaries and planting native tree species that are same as nearby tree species must be examined. Last but not least, when assessing the environmental soundness of management zones, it would be crucial to comprehensively review the environmental, social and locational features of management zones, including surrounding areas, and set the direction of environmental assessment accordingly.

• 한국시뮬레이션학회논문지
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• 제25권2호
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• pp.63-74
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• 2016

본 연구는 자가-적응 조명 제어 소프트웨어에 대한 시뮬레이션을 수행하고, 이를 통해 실제 시스템의 성능 평가 기준을 명시하는 것을 목적으로 하고 있다. 자가-적응 소프트웨어는 소프트웨어를 작동시키는 과정에서 소프트웨어가 스스로 주변 환경을 모니터링해 환경에 예상하지 못한 변화가 발생한 것을 감지하고, 변화하는 실행 환경에 맞추어 요구사항을 만족시키는 소프트웨어를 의미한다. 본 연구는 IoT(Internet of Things) 환경에서 자가-적응을 수행하는 조명 제어 시스템에 대한 연구이다. 제안하는 시스템은 환경이 변화함에 따라 사용자의 요구사항을 고려해 시스템 스스로의 적응을 수행한다. 이에 대한 시나리오와 시스템 아키텍처 및 평가지표를 소개하며, 이를 기반으로 시뮬레이션을 진행하여 성능 평가를 수행했다.