• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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• pp.1079-1084
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• 2000

The apartment houses which were constructed in a large quantity are currently being deteriorated and the reuse of them is directly related to the economic and environmental problem of the nation. Therefore, this research approaches to structural planning other than to the materials and/or the repair for the reuse of these deteriorated buildings. The research suggests the structural planning technique which includes the idea for the reinforcement of the structure in a part to improve the structural efficiency by investigating the current condition which includes the structural type of the buildings, examining the plan for the improvement of the structural efficiency, establishing the model of the space reorganization associated to the capability changes for the scale, the use, and the facilities, and checking of the structural efficiency through the structural analysis for the building structure suggested to be replaced.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2000년도 가을 학술발표회논문집
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• pp.273-280
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• 2000

Building structures which are in need of large open space make the damping effect of the structures decrease greatly. Assembly and office buildings with a lower natural frequency have a higher possibility of experiencing excessive vibration induced by human activities. These excessive vibration make the residents uncomfortable and the serviceability deterioration. The loads induced by human activities were classified into two types. First type is in place loads as like jumping, foot stamping and body bouncing. The other type is moving loads as like walking, running and dancing. A series of laboratories experiments had been conducted to study the dynamic loads induced by human activities, The earlier works were mainly concerned to parameters study of dynamic loads as like activity type, weight, sex, surface condition of structure and etc. In this paper, we have measured directly the walking loads by using the platform. And we have evaluated and analyzed load-time history of walking loads. One of the most important parameter is pacing rate (walking speed) in the walking loads. The difference between the maximum value and minimum value of walking loads depends on the walking speed.

• 한국기계가공학회지
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• 제10권2호
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• pp.52-60
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• 2011

Korea is the best country for ship-building. But nowadays, the speedboat and yacht are not mostly developed yet. For the sleek lines of ship, more innovative transmission system should be obtained in the ship industry. In general, marine transmissions often use the straight shafts and the helical gears. So it makes problem that engine-room requires large space. In this case, conical gear is the best solution for this. Until now, technology of conical gear is not generalized, but it will be increased more through many applications. So, in order to get conical gear design technology by ourselves, this thesis is conducted. This paper was written to gain useful information of marine gearbox design applied conical gear through the measurement of backlash, computer analysis and tooth contact test of helical conical involute gear pairs.

• 한국공간구조학회논문집
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• 제13권2호
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• pp.47-55
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• 2013

The design composition elements and the mechanical behavior of trusses have been investigated for Pratt trusses. As a result, it was determined that the design composition elements of the trusses consist of the composition of webs, the distance between joints, the chords profile, the depth of the truss, and the double chord composition. In addition, by analyzing models with a variation of elements, comprehensive features of structural behavior have been presented for variations of design of Pratt trusses. This is to provide more effective and useful design information on truss structure in the architectural and structural planning stage.

• Elastomers and Composites
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• 제59권1호
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• pp.22-33
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• 2024

Passive radiative cooling is a promising technology for cooling objects without energy input. Passive radiative cooling works by radiating heat from the surface, which then passes through the atmosphere and into space. Achieving efficient passive radiative cooling is mainly accomplished by using materials with high emissivity in the atmospheric window (8-13 ㎛). Research has shown that polymers tend to exhibit high emissivity in this spectral range. In addition to elastomers, other materials with potential for passive radiative cooling include metal oxides, carbon-based materials, and polymers. The structure of a passive radiative cooling device can affect its cooling performance. For example, a device with a large surface area will have a greater amount of surface area exposed to the sky, which increases the amount of thermal radiation emitted. Passive radiative cooling has a wide range of potential applications, including building cooling, electronics cooling, healthcare, and transportation. Current research has focused on improving the efficiency of passive radiative cooling materials and devices. With further development, passive radiative cooling can significantly affect a wide range of sectors.

• 한국항해항만학회지
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• 제36권3호
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• pp.253-259
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• 2012

마리나클럽을 중심으로 한 마리나는 앞으로 예상되는 해양관광 및 해양레포츠 수요에 대비한 필수적인 시설이다. 국내 여건을 반영하여 마리나와 마리나클럽은 요트수용 대수를 기준으로 한 규모와 프로그램에 따라 레포츠소형, 복합소형, 레포츠중형, 복합중형, 레포츠대형, 복합대형의 6가지 유형으로 구분할 수 있다. 서울마리나, 아라마리나, 전곡마리나 등 3개의 국내 마리나클럽을 분석한 결과 마리나전용 시설과 상업시설의 공간 비율은 평균 21% : 79% 로 나타났다. 단기적으로는 현재의 공간 구성을 유지하는 방향으로 복합형 마리나클럽 계획이 우선 시 될 것으로 예상되며, 장기적으로는 마리나전용시설 비율이 높은 레포츠형 마리나클럽으로 전환될 것으로 보인다. 또한 플로팅 마리나클럽은 해양관광 및 해양레포츠 체험을 극대화하는 친수공간 확보에 매우 유리하다.

• 설비공학논문집
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• 제18권11호
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• pp.941-946
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• 2006

Nowadays heat exchangers that have been applied for freon refrigerating systems, a shell and tube type condenser, but because of their large size, large space for installation and more amount of refrigerants are needed. Therefore, in this study, we will find the most suitable operating condition through the comparison of performance between the shell & tube type and shell & disk type heat exchanger with R22. The experiments are carried out for the condensing pressure of refrigeration system from 1,500 kPa to 1,600 kPa and for the degree of superheat from 0 to $10^{\circ}C$ at each condensing pressure. As a result of experiment, if the shell & disk type heat exchanger is applied for R22 refrigerating systems, minimized input of refrigerants and space required for installation will be secured, which will have a great contribute to financial improvement for industry.

• 한국주거학회논문집
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• 제26권2호
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• pp.111-119
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• 2015

This study aims to analyze space planning of accommodations in seven closed schools involved in experiential activity programs on Jeju Island, a famous tourist destination in Korea. The results are as follows. First, 35 schools had been closed down in Jeju between 1982 and 2015. Among them, four closed schools were sold, three are currently used by the Jeju special self-government provincial office of education, and 25 are being leased by individuals, village organizations, and other entities. However, they have not been well-operated, and so strategies for the effective management or operation of these closed schools should be developed. Second, there are distinctive differences in space planning of accommodations based on the correlation between experiential activities and the types of participants. If the experiential activity participants are mainly individuals or small groups, the closed school is likely to plan double-bed accommodations and individual bathrooms rather than large group rooms. Third, in order to operate experiential activity programs, closed schools require four different spaces for experiential activities, lodging, dining, and sanitation. The largest space available in each school building is used for experiential activities, and original classrooms are still in use. According to the standard drawing of school architecture, standard classroom size since 1997 has been $7.5{\times}9$ meters, and lodging rooms have mainly been re-planned based on the module of the standard-sized classroom. School cafeterias are utilized as dinning and kitchen spaces. For sanitation purposes, original school restrooms are still used by experiential program participants, while the shower rooms are newly equipped.

• 한국정보기술학회논문지
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• 제16권12호
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• pp.13-24
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• 2018

최근 과도한 야간조명의 사용으로 인해 발생하는 빛공해가 사회적 문제로 대두되면서, 빛공해 피해를 최소하기 위한 시도들이 지속되고 있다. 현재 국내에서 사용되고 있는 빛공해 진단방법은 주로 국소지역의 광원을 조사하는 직접 측정 방식이다. 본 연구에서는 서울시 전역의 빛공해 실태를 파악하는 기법 개발을 목적으로 국제 우주정거장(International Space Station)에서 촬영되는 야간 조명 이미지 데이터를 사용하여 서울시 빛지도를 제작하고 이를 활용하여 서울시의 빛공해 실태를 진단하고자 한다. 연구의 결과 업무시설 밀집지역과 상업 활성화 지역이 서울시 내 가장 밝은 곳으로 나타났으며, 대형 체육시설 또한 서울시내 빛을 유발하는 주요 요소인 것으로 확인되었다. 본 연구는 현재 국내에서는 잘 알려지지 않은 ISS이미지 데이터를 사용하여 서울시 빛공해의 현황을 고찰하고, 빛공해 지도를 제작할 수 있는 새로운 방법론을 제안했다는 것에 그 의의가 있다.

• 대한건축학회논문집:계획계
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• 제36권2호
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• pp.3-11
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• 2020

The police substation includes work spaces for civil services, interviews, and meetings, etc, and private spaces for rest, showers and cafeterias and so on. Since a large number of rooms for each function should be installed in a relatively small building, it is important to develop an area standard for efficient space organization in consideration of the functional characteristics and usage patterns of each space. The purpose of this study is to suggest the way for improving the area standards for spaces in police substation based on the results of existing standards analysis and case study. For this objective, architectural documents of 161 police substations built after 2013 in Korea were comparatively analyzed. Sixteen of these facilities were selected for field survey and investigated how the workspace and private area were organized and used. The results of investigation showed that there were a number of problematic cases, such as spaces not installed or insufficient, spaces used for two or more functions, spaces installed even though they are not included in the standards. It was mainly due to the fact that several important spaces which had been installed in most police substations were not included in the existing standards. The ways for improvement were suggested like following four points: (1) Modifying the criteria for classifying facility size, (2) Modifying the lists of the required spaces, (3) Specifying the basis of calculation for each space in detail, and (4) Differentiating the way to organize spaces according to the facility size.