• 전산구조공학
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• 제10권3호
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• pp.133-143
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• 1997

한국에서는 서울-부산간 고속철도건설이 5년전 시험구간의 시공을 시작으로 본격적인 고속철도건설이 진행중에 있다. 본 연구에서는, 고속철도교량의 전산화 유지관리를 위한 신뢰성에 기초한 건전성 평가모델을 개발하는데 중점을 두고 있다. 신뢰성 해석을 위한 PC철도교의 강도한계상태모형은 휨 또는 전단강도와 같이 단일 파괴모드뿐만아니라 휨, 전단 및 비틀림을 동시에 고려하는 조합상관식도 고려되었다. 실제적인 내하력 평가를 위해 체계신뢰성에 기초한 등가내하력 평가방법을 사용하였으며 이로부터 얻은 결과를 요소신뢰성과 재래적인 방법에 의한 결과와 비교하였다. 본 논문에서 제안한 모델은 실재하는 고속철도교량의 신뢰성에 기초한 실제적인 안전도 및 내하력평가를 위한 적절한 모델임을 알 수 있었다.

• Architectural research
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• 제22권2호
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• pp.41-52
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• 2020

Laboratory buildings with specialized equipment and ventilation systems pose challenges in terms of efficient energy use and initial construction costs. Additionally, lab spaces should have flexible and efficient layouts and provide a comfortable indoor research environment. Therefore, this study aims to identify the correlation between the facade of a building and its interior layout from case studies of energy-efficient research labs and to propose passive energy design strategies for the establishment of an optimal research environment. The case studies in this paper were selected from the American Institute of Architects Committee on the Environment Top Ten Projects and Leadership in Energy and Environmental Design (LEED) certified research lab projects. In this paper, the passive design strategies of space zoning, façade design devices to control heating and cooling loads were analyzed. Additionally, the relationships between these strategies and the interior lab layouts, lab support spaces, offices, and circulation areas were examined. The following four conclusions were drawn from the analysis of various cases: 1) space zoning for grouping areas with similar energy requirements is performed to concentrate similar heating and cooling demands to simplify the HVAC loads. 2) Public areas such as corridor, atrium, or courtyard can serve as buffer zones that employ passive solar design to minimize the mechanical energy load. 3) A balanced window-to-wall ratio (WWR), exterior shading devices, and natural ventilation systems are applied according to the space programming energy requirements to minimize the dependence on mechanical service. 4) Lastly, typical laboratory space zoning categories can be revised, reversed, and even reconfigured to minimize the energy load and adjust to the site context. This study can provide deep insights into various design strategies employed for construction of green laboratories along with intuitive arrangement of various building components such as laboratory spaces, lab support spaces, office spaces, and common public areas. The key findings of this study can contribute towards creating improved designs of laboratory facilities with reduced carbon footprint and greenhouse emissions.

• 한국주거학회논문집
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• 제25권2호
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• pp.19-26
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• 2014

The number of elderly who wants to access to Nursing Homes (NH) will increase due to the rapid aging society and domestic changes. Those who move into NH expect 24/7 care service in safe environment. Providing space free from danger, especially from fall, for the frail elderly is essential. The purpose of this study is to categorize performance needs of flooring materials in the aspect of safety, and analyze materials so that adequate ones for each space in NH can be suggested. Performance needs are as follows; slip resistance (dry/wet), fire resistance, resilience, water resistance, soil retardant, anti-bacterial, gloss, sound absorbtion. maintenance, durability, ease replacement, color and pattern variety, visual and tactual texture, tactile warmth, IAQ, sustainable material (before use), impact to nature (after use). They are categorized under function, economy, sensibility and sustainability. It was found that there are better materials than common ones that has been used repeatedly in NHs, such as vinyl sheets and VCT. In overall, Cork flooring and nylon carpet met all four categories, followed by wool carpet, rubber and linoleum. For bedroom, wood flooring, Cork, rubber, wool carpet, nylon carpets were suggested. In bathroom with shower, rubber, vinyl sheet and porcelain tiles were safe materials. As living/dining room and corridor floors, wool carpet, nylon carpet, cork flooring would be excellent as they are resilient and durable. The result of this paper can be used by both NH managers and material companies, resulting better quality of life of the elderly by providing safe environment.

• 한국전자파학회논문지
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• 제10권4호
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• pp.607-617
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• 1999

본 논문에서는 실내환경에서 안테나의 빔 폭에 따른 편파 다이버시티 특성을 분석하고, 실내환경에 적합한 편파 다이버시티용 안테나를 제안하기 위하여 소형, 경량, 박형의 지향성 패턴을 갖는 이중편파 마이크로스트 립 배열 안테나를 이용하여 편파 다이버시티 특성을 살펴보았다. 제작된 안테나는 빔 폭이 각각 $70^{\circ}$와 $20^{\circ}$인 $1\times4$ 배열과 $4\times4$ 배열의 안테나이며, 중심주파수는 IMT-2000 주파수대역인 1890 MHz이다. 안테나의 빔 폭 에 따른 특성을 분석하기 위하여, 도파관 구조의 다양한 폭을 지닌 복도에서 측정을 하였으며. 이를 다이폴 안테나를 사용한 공간 다이버시티 기법의 결과와 비교하였다. 측정 및 분석 결과 제작된 지향성을 갖는 이중 편파 마이크로스트립 배열 안테나를 사용한 편파 다이버시티 기법이 공간 다이버시티 기볍보다 환경에 따라 약 1-7 dB이상의 더 높은 다이버시티 이득을 나타냈다. 따라서 실내환경구조에 따른 적합한 지향성 빔 패턴 을 갖는 안테나 및 다이버시티 시스댐 설계에 효과적으로 사용되어질 수 있을 것으로 판단된다.

• 건축역사연구
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• 제18권2호
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• pp.85-105
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• 2009

This study set out to compare and analyze the influences Kabbalah, which was Louis I. Kahn's faith as a Jew, on his architecture based on Freud's psychoanalysis that had many exchanges with modernism and contemporary architecture and theories. The specific goals of the study were to shed light to Kahn's presence in contemporary architecture anew and establish the methodology of using psychoanalysis in building new theories of architectural planning. When the theories of psychoanalysis were introduced for comparison and analysis purposes, Kahn tried to differentiate his buildings by placing a function or symbolic central space at the heart of a building even though he did adopt a characteristic of modernism architecture, which was placing a core at the centre of plan, for a while. Such a tendency of his was based on Jung's opinions rather than Freud's and affected by Ecole des Beaux-Art. The analysis results also indicate that he conceived "Served Space & Servant Space," "architecture of connection" and "silence and light" that made up the essence of his architectural theory from the relationships between Ayin-Sof, Kabbalah's absolute god, and Sefiroth. It's also very likely that his often use of triangles and circles in his architecture was affected by the Tree of Sefiroth diagram of Kabbalah. His tendency is well reflected in Salk Institute and Philips Exeter Academy Library, where he placed a laboratory or courtyard at the center where a core was supposed to be, created a corridor or courtyard space between those central spaces and the core, and connected them one another with to perceive the being of Ayin-Sof into an architectural space, which is well proven with Mikveh Israel Synagogue where he directly applied the Tree of Sefiroth diagram. The synagogue also contained a hollow column that served as an important concept in his late architecture. The hollow column was also the result of him applying the concept of Sefiroth of the place where Ayin-Sof Was reduced in Kabbalah.

• 한국통신학회논문지
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• 제39C권8호
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• pp.660-666
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• 2014

본 논문에서는 선박 내부에 IP-USN(Internet Protocol-Ubiquitous Sensor Network)망을 적용한 경우 선박 내부를 기능적으로 분류하여 센서 노드를 구성하고 효율적으로 라우팅할 수 있는 방안을 제안하였다. 이동성이 제한적인 선박의 기계실이나 기관실과 같은 경우에는 트리형태의 라우팅 기법을 적용하였으며 이동성이 많은 식당이나 휴게실과 같은 거주구역에는 메시 형태의 라우팅 기법을 적용하였다. 또한 싱크 노드와 센서 노드 사이의 경로를 주기적으로 유지하기 위해서 새로운 메시지 타입인 RDES(Routing Detect Sensor-Node) 형식의 메시지를 정의하였다. RDES 메시지를 이용함으로써 이동성에 상관없이 추가되는 센서 노드에 대한 경로 업데이트가 가능하다.

• 한국환경과학회지
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• 제16권5호
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• pp.549-559
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• 2007

Vegetation surveys were performed at 45 plots along 10 highways cut slopes in South Korea. Total floral inventory, species richness and exotic plant percentage were obtained within each plot. Life history and life form of each species appeared were analyzed. Community types were classified using hierarchical cluster analysis and detrended correspondence analysis and non-metric multidimensional scaling were conducted from vegetation matrix. 292 species of vascular plants were discovered and the number of natives and exotics were 226 and 66, respectively. There were no significant differences of species richness and exotic plant percentage between cut slopes and rest areas. Hierarchical cluster analysis indicated five clear vegetation associations in cut slopes and rest areas. Detrended correspondence analysis indicated that species composition of total and native plants were similar along the highway cut slopes whereas exotic plants were distributed differentially along the highway cut slopes. in non-metric multidimensional scaling, the studied sites were more separated from each other on the basis of their species composition than the results of detrended correspondence analysis with respect to total, native and exotic plants. The both ordination represented that exotic plants have not been made uniform yet on cut slopes and rest areas by highway corridor in spite of diverse chronosequences after highway construction termination (1 to 22 years). This study showed that the distribution of species composition in exotic plants was different and localized on cut slopes and rest areas of highway in this representative peninsula area of North East Asia and the invasion of exotic plants can retard the process of plant species homogenization.

• Spatial Information Research
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• 제18권1호
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• pp.77-87
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• 2010

시공간 조인은 이동객체와 같이 시공간의 특성을 가지는 데이터를 처리할 때 요구되는 중요한 연산자로, 이동객체들의 움직임을 분석하거나 이동객체들의 시공간적 패턴을 찾는 것과 같이 다양하게 활용된다. 현재까지 실외공간에서의 시공간 조인 질의에 관한 연구는 많이 진행되어왔다. 최근에는 실내측위기술이 발전함에 따라 실외뿐만 아니라 실내에서도 다양한 위치기반 서비스가 점진적으로 제공되고 있으며, 특히 이동객체를 중심으로 다양한 응용 서비스들을 필요로 하게 된다. 하지만 실내공간에서의 시공간 조인에 관한 연구는 아직 전무하다. 본 논문에서는 실내공간에서 실시간으로 갱신되는 이동객체에 대한 연속 시공간 셀프조인 질의와 질의처리 방법론을 제안하였다. 연속 시공간 셀프조인 질의는 주어지는 특정 시간과 공간의 조건을 만족하는 모든 쌍들을 시간이 지남에 따라 지속적으로 갱신하는 질의이다. 본 논문에서는 방이나 복도와 같이 특정한 기호를 중심으로 이동객체의 위치를 표현하며 이러한 특징을 가지는 공간을 기호공간이라 한다. 그리고 방대한 스트림데이터를 효과적으로 필터링하고 관리하기 위한 후보쌍 버퍼 테이블이라는 자료구조와 이를 활용한 질의처리 방법론을 제안하였으며 실험을 통해 타당성을 검증하였다.

• 대한전자공학회논문지SP
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• 제47권1호
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• pp.73-82
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• 2010

실내 환경에서 문은 주어진 주변 환경을 이해하기 위한 매우 중요한 정보로써, 복도와 방을 구분할 수 있는 기준이 된다. 문은 이동 로봇을 위한 자연 표식 등으로 널리 사용되고 있으나, 로봇에서 획득한 영상내의 특징을 이용한 기존의 문 인식 방법의 경우 연산량이 많기 때문에 실시간으로 구현하는데 어려움이 있다. 본 연구에서는 복도 환경에서 문을 인식하기 위한 새로운 방법을 제안한다. 먼저 허프 변환(Hough transform)을 사용하여 문을 구성할 가능성이 큰 직선들을 추출하고 시각 퍼지(Visual fuzzy) 시스템에서 적용하여 문 후보 영역을 검출하게 된다. 이후 문 후보 영역에서 문 고리 후보 영역들을 뽑고 이를 이차적인 시각퍼지 시스템에 적용하여 최종적으로 문을 검증한다.

• 한국환경복원기술학회지
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• 제18권2호
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• pp.19-32
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• 2015

In Korea, significant riparian areas have been developed due to river maintenance projects. Introduction of new riparian facilities can negatively affect wildlife in the riparian areas. This study focuses on selecting core conservation areas for Eurasian Otter(Lutra lutra) to support decision making process for development of riparian areas. For the study, first of all, field data of study site were collected by field surveys. Secondly, stream naturalness was assessed to understand physical environments of the study sites. Thirdly, habitat suitability was assessed using occurrence data of Eurasian Otter and environmental data. Lastly, core areas for conservation was selected by comparing and synthesizing stream naturalness map and habitat suitability map. The selected core areas showed several characteristics. The number of artificial facilities is low in the core areas. Rocks which are preferred by Eurasian Otter to eat and excrete are plentiful in the core areas. Also, the ratio of adjacent farmland is high. Based on the analyses, it is expected that this study can contribute to decision making process for environmental spatial plans to better conserve habitats of Eurasian Otter.