• 한국전자파학회논문지
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• 제11권7호
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• pp.1194-1203
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• 2000

1 mG부터 5 G까지 발생시킬 수 있는 소동물 실험율 60Hz 자계 발생장치를 설계하고 제작하였다. 동시에 많은 동물을 시험하기 위해서는 발생장치 내의 균일한 자계 분포 영역이 넓어야 하는데, 본 고에서는 SD-계쥐 약 50마리를 수용할수 있도록 하기 위해 소동물의 거주 공간을 장치 내부 1$\times$1$\times$1m3 크기로 하고 전체 발생장치의 크기는 1.8$\times$1.8$\times$1.8m3 입방형으로 설정하였다. 장치 내부의 자계 균일도를 검증하기 위해서 3차원 자계 계산 프로그램을 개발하였고, 이를 이용하여 거주 공간의 자계 분포가 가장 균일하게 되는 내.외곽코일의 최적 전류비 및 위치를 결정하였다. 또한 수치계산을 통한 임피던스에 근거하여 전원장치를 제작하였다. 제작된 자계 발생장치는 측정을 통하여 동물 거주 공간의 자계 최대치와 최소치의 차이가 3% 이내임을 확인할수 있었고 정밀한 소동물 자계 노출 시험용으로 사용 가능한 것으로 판단되었다.

• 한국환경보건학회지
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• 제46권5호
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• pp.548-554
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• 2020

Objectives: This study is to examine the polyvinyl chloride (PVC) materials in elementary school classrooms and libraries in Seoul, and to investigate phthalate contamination in indoor dust. Methods: PVC material was identified for building materials and furniture using portable x-ray fluorescence (XRF). Phthalates in dust samples (n=19) were extracted by ultrasonic extraction using cyclohexane and analyzed by GC-MS. Results: Diethyl phthalate (DEP), di-n-butyl phthalate (DBP), and Bis (2-ethylhexyl) phthalate (DEHP) were found in all collected dust samples (n=19), and diisonyl phthalate (DINP) was detected in all except for one sample (n=18). The concentration of DEHP (median: 2190 mg/kg) and DINP (2960 mg/kg) were higher than other compounds, suggesting that there are many products in the school that used these compounds. When comparing the phthalate concentration in the classroom (n=11) and library dust (n=8), the total concentration in the classroom (median: 10000 mg/kg) was higher than that in the library (8030 mg/kg). DEHP was the dominant compound in the library. The library is relatively more equipped with PVC furniture (n=83) and most floors are also identified as PVC material, suggesting that floors and furniture made of PVC materials are main sources of DEHP contamination. Conclusions: This study is a pilot survey for investigating phthalate contamination in elementary schools. As a result of the survey, phthalate contamination in elementary school was confirmed. However, further study requires risk assessment of children through analysis of phthalate metabolites in children based on sufficient number of samples and information about the site.

• 한국산학기술학회논문지
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• 제12권5호
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• pp.2038-2047
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• 2011

본 논문에서는 TFT-LCD(Thin Film Transistor-Liquid Crystal Display) 제조 공정 중 Module 공정의 Slim MES(Manufacturing Execution System)를 위한 생산계획 프레임워크(framework)개발에 관해 연구한다. TFT-LCD 제조 공정 중 Module 공정의 라인 구성 및 기능은 각 제조 현장마다 차이가 있다. 본 논문은 이러한 차이를 반영하는 제조현장 맞춤형 MES를 위한 생산계획 프레임워크를 제시한다. 먼저 TFT-LCD Module 공정의 분석을 통해 생산계획 프로세스를 파악한다. 그런 다음 현장 상황 제약조건을 반영한 수리적 모델링을 제시하고 이에 대한 최적 스케줄의 도출을 사례를 통해 제시한다. 또한 현장 상황을 반영한 디스패칭(dispatching) 룰에 의한 스케줄 생성 과정을 제시하고 성능실험 결과를 제시한다. 마지막으로 Slim MES를 위한 생산계획 프레임워크 설계 과정을 제시한다.

• 한국실내디자인학회논문집
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• 제20권3호
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• pp.249-258
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• 2011

As the elderly population are rapidly growing, the elderly who needs special care and nursing homes for them are also growing. However, many nursing homes were planned without considering the hierarchial space organization such as division of housing unit and nursing unit based on the cognitive and behavioral characteristics of the elderly or accessibility and supportiveness of the staff. This study was to examine the hierarchial characteristics in space organization of nursing homes by using Space Syntax. The subjects were 8 nursing homes in Busan. First, spaces in nursing homes were divided into five areas based on the literature review. Then the hierarchy of space organization for the access layer and layers of living floors was grasped by using G-graph. The access layer has a tree-type hierarchical structure and high visuality. Also, average depth of the space was 5. Then the full integration was analyzed. Mobile area, such as elevator, hallways, or living rooms has a high accessibility and the middle corridor type has commonly been characterized. The nursing stations were analyzed through the control degree and it was low in three nursing homes such as B, C, and G. The low clarity was showed in B, D, and F. The low clarity means that it is relatively difficult to recognize the whole space organization of nursing home. Even though the hierarchy of their living floors was tree-type structure with a high visuality, they has a type of grouping spaces around hallways and spreading, or a ring type.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2006년도 춘계학술발표대회 논문집
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• pp.113-118
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• 2006

The lobby is the space that contributes the most to conveying the first impression of an enterprise or company that is occupying a building, and enhances the quality of the urban or business environment around an office building. Transparency is the biggest change in architecture since the modern age began, and it is the most important element of the lobby expression methods. Therefore this study was an attempt to understand the expression method of transparency which is expressed in the lobby space of office buildings, and used documentary survey and field survey to analyze it. In the examination of the theoretical background of transparency to make a specific study purpose, and based on an on-the-spot probe document, an attempt was made to grasp the expression method of Visual Transparency and Phenomenal Transparency. The data collected during this investigation was studied and a correlation coefficient. A summary of the findings of this study is as follows: 1) Transparent materials does not appear often in floors. But Phenomenal Transparency material is used in the floor. 2) During the survey it was discovered that Visual Transparency was often used in the walls of each investigated building. Phenomenal Transparency materials are found less in walls than in the floors of lobbies. 3) The expression methods that appeared the most in ceilings among the Visual Transparent expression methods. In the case of Phenomenal Transparency, the highest distribution is seen in ceilings. 4) The result of the analyzation of the correlation coefficient of Visual Transparency and Phenomenal Transparency is as follows: Expression method: There is more than one expression method of transparency, 'Open Sight', 'Light Material' and 'Surface Material' methods were introduced in case of the introduction of 'Transparent Material' among Visual Transparency in office building lobby space planning. If the 'Superimposed Space' method is introduced, then the 'Ambiguous Border' or 'Dual Sight' methods are introduced.

• 한국강구조학회 논문집
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• 제22권6호
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• pp.599-608
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• 2010

트러스의 상현재와 콘크리트 슬래브가 합성 거동하는 합성 트러스는 장스팬에 경제적인 구조시스템임에도 불구하고 현재 국내에서 설계되는 대부분의 트러스 보는 바닥슬래브와의 합성효과를 전혀 고려하지 않고 설계되고 있다. 슬래브와 트러스 보의 합성효과를 고려할 경우에는 단순히 고정하중으로 취급되던 슬래브를 구조체로서 활용할 수 있으므로 구조 재료를 매우 효율적으로 활용할 수 있게 되고 구조체의 강성이 증가하게 되므로 장스팬 설계의 중요 변수인 사용성 측면에서도 상당한 이점을 확보할 수 있게 된다. 이와 더불어 슬래브 하부에 다양한 설비 시설을 위한 공간이 확보되므로 보의 춤이 깊어지는데 대한 단점을 상당부분 상쇄할 수 있게 된다. 본 연구는 합성 트러스 시스템을 개발함에 있어 국내 현실을 충분히 반영하여 국내 설계 및 시공 현장에서 바로 적용하기 위한 초기단계의 연구로서 실험과 수치해석을 통해 스터드 커넥터의 유 무에 따른 합성 트러스의 역학적 거동 특성을 평가하기 위한 것에 목적을 두고 있다.

• 한국실내디자인학회논문집
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• 제23권5호
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• pp.131-138
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• 2014

The purpose of this study is to examine spatial composition elements of the public sector through medium-sized first class urban hotels of Korea and Japan, the two countries with geopolitical closeness and high cultural and economic correlation, and to provide data needed for devising future urban hotel plans. The scope of this study included case studies on medium-sized first class urban hotels (10 urban hotels with concours composition type in the public sector) located in downtowns of Korea (5 hotels) and Japan (5 hotels). The study was conducted by analysis of drawing based on review of preceding studies and literature, and on-site survey. The results of survey and analysis on physical spatial elements shown in medium-sized urban hotels of Korea and Japan with concours composition type among composition types in the public sector are as follows. First, as a result of analyzing spatial elements of medium-sized urban hotels in the public sector, an in-depth checklist must be prepared with consideration on intimate correlation between elements to devise a construction spatial plan for urban hotel in the future. Second, as a result of comparatively analyzing area ratio for each function (public sector, sales sector and service sector) through area analysis on the lower floors of medium-sized urban hotels, reference data for planning were found in regards to spatial composition ratio of the public sector. Third, as a result of analyzing spatial elements of lobby hall and traffic line of visitors on the lower floors of medium-sized urban hotels in the public sector, there was a substantial difference between hotels of Korea and Japan.

• Wind and Structures
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• 제15권6호
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• pp.531-553
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• 2012

Many tall buildings possess through-building gaps at middle levels of the building elevation. Some of these floors are used as sky gardens, or refuge floors, through which wind can flow with limited blockage. It has been reported in the literature that through-building gaps can be effective in reducing across-wind excitation of tall buildings. This paper systematically examines the effectiveness of two configurations of a through-building gap, at the mid-height of a tall building, in reducing the wind-induced dynamic responses of the building. The two configurations differ in the pattern of through-building opening on the gap floor, one with opening through the central portion of the floor and the other with opening on the perimeter of the floor around a central core. Wind forces and moments on the building models were measured with a high-frequency force balance from which dynamic building responses were computed. The results show that both configurations of a through-building gap are effective in reducing the across-wind excitation with the one with opening around the perimeter of the floor being significantly more effective. Wind pressures were measured on the building faces with electronic pressure scanners to help understand the generation of wind excitation loading. The data suggest that the through-building gap reduces the fluctuating across-wind forces through a disturbance of the coherence and phase-alignment of vortex excitation.

• Earthquakes and Structures
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• 제6권1호
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• pp.71-87
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• 2014

Interaction between closely-spaced buildings subject to earthquake induced strong ground motions, termed in the literature as "seismic pounding", occurs commonly during major seismic events in contemporary congested urban environments. Seismic pounding is not taken into account by current codes of practice and is rarely considered in practice at the design stage of new buildings constructed "in contact" with existing ones. Thus far, limited research work has been devoted to quantify the influence of slab-to-slab pounding on the inelastic seismic demands at critical locations of structural members in adjacent structures that are not aligned in series. In this respect, this paper considers a typical case study of a "new" reinforced concrete (R/C) EC8-compliant, torsionally sensitive, 7-story corner building constructed within a block, in bi-lateral contact with two existing R/C 5-story structures with same height floors. A non-linear local plasticity numerical model is developed and a series of non-linear time-history analyses is undertaken considering the corner building "in isolation" from the existing ones (no-pounding case), and in combination with the existing ones (pounding case). Numerical results are reported in terms of averages of ratios of peak inelastic rotation demands at all structural elements (beams, columns, shear walls) at each storey. It is shown that seismic pounding reduces on average the inelastic demands of the structural members at the lower floors of the 7-story building. However, the discrepancy in structural response of the entire block due to torsion-induced, bi-directionally seismic pounding is substantial as a result of the complex nonlinear dynamics of the coupled building block system.

• 한국비블리아학회지
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• 제26권1호
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• pp.51-76
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• 2015

학교도서관은 다양한 정보자료 및 공간을 제공함으로써 학생들에게는 독서를 통한 창의력 향상 및 인성교육의 기회를 제공하고, 교사에게는 학생의 적성과 능력에 맞는 교수방법을 개발하여 질적으로 우수한 교육실시의 기회를 제공하는데 그 목표를 두고 있다. 학교도서관은 더 이상 도서 보관의 장소가 아니며 학교교육 과정의 중심공간으로서의 역할을 하고 있다. 본 연구는 학교교육 과정의 중심공간인 학교도서관의 주이용자인 학생 및 교사가 이용하기에 가장 적합한 학교도서관의 위치로 운영자인 사서들의 인식을 조사하여 적합한 위치를 제시하고자 하였다. 위 연구의 목적을 달성하기 위해 본 연구에서는 학교도서관 시설에 관한 연구와 학교도서관 활성화에 관한 선행연구를 조사 분석하고 전국 학교도서관 사서를 대상으로 설문조사를 수행하였다. 연구결과, 학교도서관의 '소재건물, 층수, 건물 내 위치, 면적' 등의 요인들은 사서대상 위치 만족도 조사에서 유의미한 수치가 발견되었으며, 사서들의 학교도서관 위치 인식 전체와 높은 상관관계를 보여주었다.