• 한국항해항만학회지
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• 제39권3호
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• pp.179-184
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• 2015

이 연구의 목적은 건전성 평가 기법을 통해 해양 구조물 중 생산 라이저의 건전성 및 안전성을 확보할 수 있도록 하는 것이다. 생산 라이저의 건전성 평가 기법을 선정하기 위해서 레벨 I, II의 비파괴 손상평가(NDE) 기법을 분류 및 검토하였다. 그리고 수치해석을 통해 검토한 기법의 손상 탐지 성능 및 적용성을 확인하였다. 그 결과 모달 변형 에너지를 이용한 손상탐지 기법이 다른 기법들에 비해 가장 손상에 대해 민감한 결과를 나타냈다. 실제 구조물에서 모니터링 시스템을 적용하는 경우 환경적, 경제적 요인들에 의해 센서 개수는 제한적이다. 센서 수의 감소함에 따른 손상탐지 성능에 대한 영향을 일련의 수치해석 과정을 통해 분석하고 그 결과를 논의하였으며, 생산 라이저의 건전성 평가에 대한 최적 센서 개수를 추천하였다.

• 한국실내디자인학회논문집
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• 제24권1호
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• pp.12-22
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• 2015

When it comes to the architecture design, Kuma Kengo rejects a strong and violent subject-centered position and advocates the design that is object-oriented. As can be seen in 'gentle architecture', 'three lows principle', 'natural architecture', and 'connecting architecture', he clearly expresses the objective nature of architecture design in those terms. In this respect, the purpose of this study is to make a close inquiry into the meaning, effect and characteristics of objectivity. In particular, we try to identify the contents of 'impure architecture', which has a clear ambivalence to be an instrumental expression strongly settled in the objectivity, in an aesthetic standpoint. To do that, we systemized the concept of mimesis and the theory of subversive appropriation by Walter Benjamin and Theodor Adorno in to a frame of interpretation. By systemizing translation, subversion, verbalization and the dialectic structure of the aesthetics of negation, we interpreted the features of his works as an objective work and 'impure architecture'. His objectivity leads the situation by subversively appropriating the inherent elements of architectural conditions based on a dialectic solution in which inquiries on logical and scientific materials have played a critical role. Above all, through all these processes, he tried to suggest a language as a new technique for materials and structures. Ultimately, we could find out that this object oriented design sublates a subject oriented way that is monolithic and repetitive regardless of objects. Rather, it is a way that is effective in creating a new way of design by making a different approach to a new object rather unfamiliarly, yet deeply.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.280-283
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• 2007

The first grid-connected, building-integrated transparent amorphous silicon photovoltaic installation has been operated since October 2004 in Yongin, Korea. The 2.2kWp transparent PV system was applied to the facade of entrance hall in newly constructed KOLON E&C R&D building. The PV module is a nominal 0.98m ${\times}$ 0.95m, 10% transparent, laminated, amorphous(a-Si) thin-film device rated at 44 Wp per module. To demonstrate the architectural features of thin film PV technologies for daylighting application, transparent PV modules are attached to the building envelope with the form of single glazed window and special point glazing(SPG) frames. Besides power generation, the 10% transmittance of a-Si PV module provides very smooth natural daylight to the entrance hall without any special shading devices for whole year. The installation is fully instrumented and is continuously monitored in order to allow the performance assessment of amorphous silicon PV operating at the prevailing conditions. This paper presents measured power performance data from the first 12 months of operation. For the first year, annual average system specific yield was just 486.4kWh/kWp/year which is almost half of typical amorphous silicon PV output under the best angle and orientation. It should be caused by building orientation and self-shading of adjacent mass. Besides annual power output, various statistical analysis was performed to identify the characteristics of transparent thin film PV system.

• 한국강구조학회 논문집
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• 제16권1호통권68호
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• pp.81-89
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• 2004

구조물과 같은 아치의 진동해석은 많은 산업분야에서 다양하게 적용되기 때문에 공학적 문제에 중요한 주제이다. 특히 변화하는 단면형상을 가지는 아치는 질량이나 강도를 최적화 하거나 특별한 구조물이나 요구조건들을 만족하기 위해서 폭넓게 사용되어 진다. 최근에는 일반화 미분구적법(GDQM)이나 미분변환법(DTM)은 각각 Shu와 Zou에 의해서 제안이 되었다. 연구에서는 변화하는 단면형상을 가지는 아치의 진동해석이 일반화 미분구적법과 미분변환법을 적용하였다. 변화하는 단면형상을 가지는 아치에 대하여 지배방정식이 유도되어졌으며, 미분변환과 일반화 미분구적법의 개념이 간단히 소개되었다. 변화하는 단면형상을 가지는 아치의 무차원화된 고유진동수가 다양한 경계조건에 대해서 구해졌으며, 이러한 방법들에 의해서 얻어지는 결과들은 선행연구와 비교 되어졌다. 일반화 미분구적법과 미분변환법은 변화하는 단면형상을 가지는 아치의 진동문제를 해석함에 있어서 빠른 수렴, 정확도, 효율성, 유효성을 보인다.

• 한국산학기술학회논문지
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• 제15권12호
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• pp.7393-7402
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• 2014

본 연구는 최근에 높아지고 있는 도시농업 요구에 건축, 도시분야가 빠르게 대응하기 위해서 법제도적 장치로서 기존에 활용도가 높은 생태면적률의 개선에 주목한 연구이다. 기존의 생태면적률은 여러 작물생장조건 중 토심과 투수만을 다룬 지표로 조경식재 등의 관리에는 활용될 수 있으나 도시농업의 주요요소인 작물을 다루기에는 부족한 점이 있다. 본 연구는 이러한 가설을 증명하고 그 개선의 방향을 제시하는 것을 목적으로 했다. 본 연구를 통해서 실제로 생태면적률 지표만으로 작물생장까지를 다루기에는 한계가 있음을 밝힐 수 있었다. 또한 실제 단지계획상에서의 문제점을 도출할 수 있었다. 본 연구는 생태면적률에 빠져 있는 작물생장 조건 중 가장 중요한 일조를 중심으로 생태면적률 개선의 가능성 및 개선 방향을 타진했다는 점에서 도시농업 활성화를 위한 기초 연구를 수행했다는 점에서 의의를 지닌다.

• Wind and Structures
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• 제26권1호
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• pp.11-24
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• 2018

Full-scale measurements of wind action on the open roof structure of the WuXi grand theater, which is composed of eight large-span free-form leaf-shaped space trusses with the largest span of 76.79 m, were conducted during the passage of Typhoons HaiKui and SuLi. The wind pressure field data were continuously and simultaneously monitored using a wind pressure monitoring system installed on the roof structure during the typhoons. A detailed analysis of the field data was performed to investigate the characteristics of the fluctuating wind pressure on the open roof, such as the wind pressure spectrum, spatial correlation coefficients, peak wind pressures and non-Gaussian wind pressure characteristics, under typhoon conditions. Three classical methods were used to calculate the peak factors of the wind pressure on the open roof, and the suggested design method and peak factors were given. The non-Gaussianity of the wind pressure was discussed in terms of the third and fourth statistical moments of the measured wind pressure, and the corresponding indication of the non-Gaussianity on the open roof was proposed. The result shows that there were large pulses in the time-histories of the measured wind pressure on Roof A2 in the field. The spatial correlation of the wind pressures on roof A2 between the upper surface and lower surface is very weak. When the skewness is larger than 0.3 and the kurtosis is larger than 3.7, the wind pressure time series on roof A2 can be taken as a non-Gaussian distribution, and the other series can be taken as a Gaussian distribution.

• KIEAE Journal
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• 제10권3호
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• pp.43-50
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• 2010

Natural lighting is directly connected with our mental and physical health. For working or learning effect, the proper natural lighting is required for improving our living conditions. School facilities, especially, are the place where includes students' ordinary activities with learning behaviors during the school years from elementary to high school. This study was carried out for the purpose introducing a basic database in that planning a school by researching on the actual in the natural lighting system of some schools' classroom, estimating, and analyzing through a simulation, which resulted in a method of improving the natural lighting system. As a result of measuring and analyzing Daylight Factor(DF) during the time from 9 am to 3 pm when students are activating in their classroom, generally DF range of the sides near to window and aisle seats zone are not distributed well. Besides, two out of four school which are researched would not reach the standards of the law for school sanitary while rest of the schools meet the standards; Average DF 5% and Minimum DF 2%. And the result of a simulation by RADIANCE program shows the most appropriate DF range when it is applied in variable numbers about an oriehows the- South-east 15, south-east 30, south-east 45, south-west 15, south-west 30, and south-west 45 degrees. When it is applied in the variable numbers about glass transmittance - 60%, 70%, and 80% in condition facing south of a classroom, the result shows that the DF range of 80% transmittance is relatively higher than other glasses in the classroom. Thus, when a school is built, plans for an orientation is necessary for improve of elementary schools' environment with the glass installation which is made for high transmittance and is regarded with the students' activities time.

• 한국철도학회논문집
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• 제12권6호
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• pp.1049-1058
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• 2009

한국의 철도공장은 철도도입과 함께 설립되었고 근대기 산업건축의 중심이 되었다. 한국 철도공장의 대표적 사례인 용산공장에는 근대기 건물이 다수 현존하는데, 특히 규모를 잘 보존하고 있어 이를 중심으로 근대기 건물의 건축적 특성을 살펴보고자 한다. 한국의 철도공장은 입지조건이 적합한 곳에 건립되었고, 작업공정에 따른 시설 배치, 각각의 용도와 기능에 따른 독특한 구조 및 단면 입면의 형태를 갖고 있고 철골구조와 철근콘크리트 구조를 적극 도입하여 구조적 변환기로서의 특성을 보여주고 있다. 따라서 철도공장이 한국 근대 공장건축의 초기적 특성을 갖고 있고 한국 근대기의 산업건축유산으로써, 중요한 가치를 지닌 과제임을 밝히려 한다.

• 상하수도학회지
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• 제32권1호
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• pp.1-10
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• 2018

Recently, interest in the development of alternative water resources has been increasing rapidly due to environmental pollution and depletion of water resources. In particular, seawater desalination has been attracting the most attention as alternative water resources. As seawater desalination consumes a large amount of energy due to high operating pressure, many researches have been conducted to improve energy efficiency such as energy recovery device (ERD). Consequently, this study aims to compare the energy efficiency of RO process according to ERD of isobaric type which is applied in scientific control pilot plant process of each $100m^3/day$ scale based on actual RO product water. As a result, it was confirmed that efficiency, mixing rate, and permeate conductivity were different depending on the size of the apparatus even though the same principle of the ERD was applied. It is believed that this is caused by the difference in cross-sectional area of the contacted portion for pressure transfer inside the ERD. Therefore, further study is needed to confirm the optimum conditions what is applicable to the actual process considering the correlation with other factors as well as the factors obtained from the previous experiments.

• 한국전산구조공학회논문집
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• 제27권5호
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• pp.361-368
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• 2014

본 연구에서는 테이퍼 보에 대한 미분방정식의 일반해에 캔틸레버 보의 경계조건을 적용하여 모드특성을 추정한다. 또한, 휨을 받는 테이퍼 원형강관 캔틸레버 보에 발생하는 관통균열을 모델링하기 위하여 에너지 방법을 이용하여 균열보에 대한 보 길이방향 휨강성을 구한 후 이를 이용하여 테이퍼 원형강관 캔틸레버 균열보에 대한 고유주파수와 모드형상을 추정한다. 보 길이에 따른 균열보의 휨강성 변화는 기존 연구에서 밝혀진 현상과 유사하게 합리적인 양상을 보였으며, 유도한 휨강성을 적용하여 산정한 균열보의 고유주파수는 균열 크기가 증가할수록 감소함을 확인하였고, 모드형상은 균열발생에 의해 변화함을 알 수 있었다. 연구결과는 향후 테이퍼 원형강관 캔틸레버 보 형태의 타워 구조물에 대한 진동기반 균열탐지에 활용될 수 있을 것으로 판단된다.