• KIEAE Journal
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• v.17 no.3
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• pp.15-21
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• 2017

Purpose: "Building energy design standard" is used to limit the thermal transmittance of building in Korea. However, it only covers the insulation standard for each appropriate elements of a building, not the thermal performance of Junction thermal bridge of windows and doors installed in wall. Therefore in this study, we have evaluated the thermal performance of Junction thermal bridge depending on installation method and position of windows and provide it as design data. Method: We analyzed heat transfer of 4-Track sliding window and tilt & turn triple glazed window that are placed in the first class category on window energy efficiency rating using Window 7.4 and Therm 7.4. Result : First, linear thermal transmittance of 4-Track sliding window differs by 2.2 times or more depending of installation method and location. It is higher than the linear thermal transmittance, 0.01W/mK, proposed by Passivhaus. Second, linear thermal transmittance of Tilt & turn triple glazed window differs by 7.7 times or more depending of installation method and location. The average linear thermal transmittance was less than 0.01W /mK when windows were installed on the internal wall insulation by the fixed hardware attachment method. Third, the thermal losses of a window caused by a junction thermal bridge are inversely proportional to the window area and converge gradually as the area increased.

• KIEAE Journal
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• v.17 no.3
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• pp.91-97
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• 2017

Purpose: Various studies on a light shelf are in progress, but it has the problem of glare occurrence. The present study suggested a diffusion film as the method for resolving the glare problem, and aimed to establish light shelf-related basic data by conducting the performance evaluation of a light shelf depending on the installation position of the diffusion film. Method: To carry out the light shelf performance evaluation depending on the diffusion film installation position, three cases were established: no diffusion film installation (Case 1), diffusion film installation on the reflector (Case 2), and diffusion film installation on the upper glass surface of the window for light shelf installation (Case 3); and the energy reduction performance, luminance, and luminance contrast were analyzed based on a testbed. Result: The conclusions of this study are as follows. 1) When the diffusion film was applied, the amount of light introduced through the light shelf decreased, and the average indoor illumination decreased accordingly. 2) For Case 3, the lighting energy reduction performance was identical to the lighting energy reduction efficiency of the existing light shelf; and for Case 2, it was found to be inappropriate as the lighting energy consumption increased compared to that of the existing light shelf. 3) The analysis of the glare for the cases established in this study showed that the luminance contrast was low for Case 3, and thus the glare problem could be minimized. 4) The specific angle of the light shelf could induce the glare problem by increasing the luminance depending on the external condition. 5) Based on the aforementioned contents, the installation position of the diffusion film for improving the lighting performance and glare problem of the light shelf was found to be the upper glass surface of the window for light shelf installation.

• KIEAE Journal
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• v.17 no.3
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• pp.119-124
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• 2017

Purpose: Groundwater heat pump (GWHP) system has high coefficient of performance than conventional air-source heat pump system and closed-loop type geothermal system. However, there is problem in long-term operation that groundwater raise at the diffusion well and reduced at the supply well. Therefore, it is necessary to accurately predict the groundwater flow, groundwater movement and control the groundwater level in the wells. In this research, in consideration of hydrogeological characteristic, groundwater level and groundwater movement were conducted analysis in order to develop the optimal design method of the two-well system using the pairing pipe. Method: For the optimum design of the two-well system, this research focused on the design method of the pairing pipe in the simulation model. Especially, in order to control the groundwater level in wells, pairing pipe between the supply well and diffusion well was developed and the groundwater level during the system operation was analyzed by the numerical simulation. Result: As the result of simulation, the groundwater level increased to -2.65m even in the condition of low hydraulic conductivity and high pumping flow rate. Consequently, it was found that the developed system can be operated stably.

• KIEAE Journal
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• v.17 no.3
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• pp.125-131
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• 2017

Purpose: The study is to measure concentrations of indoor air pollutants in housing and to analyze the characteristics of pollutants in housing indoor-air between summer and winter comparatively. The research result could be used as data for public health through indoor air quality management of existing housing and more as a reference for new housing. Method: It was investigated 24 middle class housings of metropolitan area in winter which have been built for the past 30 years. Concentration of HCHO, TVOC was investigated in living room at morning and night and concentration of $CO_2$ was investigated in living room and master bedroom at morning and night. SKT100-X5 was used for concentration of HCHO, TVOC and ZGm053UK for concentration of $CO_2$. The characteristics of HCHO, TVOC, $CO_2$ concentration in winter were analyzed and then the concentrations in winter were analyzed the concentrations in summer being preceding research comparatively. Result: Average concentration of TVOC in winter was 2.7 times more than that of TVOC in summer, average concentration of HCHO in winter was about 2.0 times more than that of HCHO in summer. Average concentration of $CO_2$ in the morning at living room in winter was 1.3 times more than that of $CO_2$ in summer. Average concentration of $CO_2$ in the morning at master bedroom in winter was 1.1 times more than that of $CO_2$ in summer. Average concentration of TVOC was 1.31 times more than that of HCHO and standard deviation of that was 1.73 times higher. Average concentration of $CO_2$ was almost nearly close or over to 1,000ppm being criteria of the Ministry of Environment.

• KIEAE Journal
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• v.17 no.3
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• pp.5-13
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• 2017

Purpose: Various studies have been performed to address the issue of increased energy use by buildings. In particular, research on complex envelopes that combines diverse envelope element techniques is currently in progress in the building sector. The present study aimed to develop an awning system using a light shelf, and to verify its validity through performance evaluation. Method: In the present study, a testbed was established for the performance evaluation of the awning system using a light shelf, and the uniformity ratio and lighting energy consumption were compared and analyzed relative to those with no awning and light shelf installation (Case 1), awning installation (Case 2), and light shelf installation (Case 3). Result: 1) In the present study, an awning system using a light shelf (Case 4) where an opening is made on the awning screen and natural light can be introduced through the light shelf located at the bottom was developed. 2) The optimum standard for Case 4 obtained through the performance evaluation was a 0.6m lighting length and a 2m extension length at a light shelf angle of $30^{\circ}$. 3) Case 4 with the optimum standard had a 5.5% lower uniformity ratio than Case 2, but had a higher uniformity ratio than Case 1 and Case 3. 4) Case 4 with the optimum standard showed 13.3%, 44.6%, and 0%~8.7% lighting energy reductions compared to Case 1, Case 2, and Case 3, respectively. 5) Based on the above results, Case 4 suggested in the present study was found to be effective for indoor light environment improvement and lighting energy reduction.

• Journal of the Korean Institute of Landscape Architecture
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• v.30 no.5
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• pp.78-88
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• 2002

본 연구는 울산월드컵경기장의 조경현황을 분석함과 동시에 경기가 끝난 후에도 이곳을 찾는 이용자들의 요구를 수렴함으로써, 향후 경기장조경시에 적용할 수 있는 교훈을 얻기 위한 목적을 두고 진행되었다. 조경현황에 대한 분석 자료는 월드컵경기장 조경을 위한 시공보고서와 도면 및 사진 그리고 현장에서 수집한 제반 자료이며, 이용자요구는 현장에서 조사한 이용행태이다. 연구결과 2002월드컵대회에 대비해서 만들어진 울산월드컵경기장은 건축공간을 확보하는 과정에 서 대규모의 정지작업을 실시하여 과다한 지형변화가 발생하였으나, 친환경적인 법면의 처리와 향토식생의 도입 및 대형목 등의 이식을 통해서 자연과 친화될 수 있는 경관을 조성하고 있었다. 특히 기존의 옥동저수지를 보전.활용하여 친수공간을 확보한 것은 울산월드컵경기장조경에서 주목할만한 특징으로써, 기회요소를 지혜롭게 활용한 좋은 사례가 되고 있다. 한편, 울산월드컵경기장은 시민들이 부담 없이 여가공간으로 활용할 수 있는 공원적 기능이 체육시설에 접목됨으로써 기존의 경기장과는 달기 체육, 문화, 교육기능이 복합적으로 기능하는 세계적 수준의 체육공원으로 개발되었다. 또한, 울산이 가진 역사 문화적 요소를 상징적인 설계언어로 도입한 것은 역사적 장소성을 중시한 설계방법으로서 이것 역시 울산월드컵경기장조경의 특징으로 손꼽을 수 있는 것이다. 특히 울산월드컵경기장은 경기가 종료된 이후에도 시민들에게 적극적으로 개방되고 있으며, 시민공원의 성격으로 이용될 수 있는 다원적 기능을 가지고 있어서 주목되는 바가 컸다 이와 같은 경기장 건설의 개념은 공간의 이용을 시간적으로 확장하는 것으로서 향후 보다 적극적으로 도입되어야 할 현대적 개념의 공간이용으로 볼 수 있다. 연구결과 향후 울산월드컵경기장이 시민의 휴식과 문화공간으로서 보다 적극적으로 기능하기 위해서는 경기장은 물론 공원으로 이용되는 공간에 대한 철저한 유지관리와 운영관리에 대한 노력이 필요할 것으로 생각된다. 특히 자연환경이 훼손된 부분에 대해서는 원래의 생태적 질서가 회복될 수 있도록 더욱 노력하여야 할 것이다.

• Journal of Korean Society for Geospatial Information Science
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• v.18 no.1
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• pp.41-46
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• 2010

The latest multi-dimension spatial information technology is emerging its importance as material for carrying out efficient facilities management's supporting business about numerous facilities inside a university, budgeting decision-making supporting business such as operating expenses' budgeting and management, etc. and admission advertisement, etc. Accordingly, the present study selected an optimal location that can maximize spatial utilization of a building to be newly built by constructing multi-dimension spatial information for facilities management of a university, and executed a site suitability analysis according to transfer of a university symbol and a landscape analysis, etc. according to external environment change. As a result, it appeared that the effects such as prevention of duplicate investment and budget saving, etc. due to university's comfortable spatial composition and systematic comprehensive development & budgeting or decision-making support in case of execution, etc. caused by rationalization of facilities plan & management can be maximized.

• Journal of the Korean Recycled Construction Resources Institute
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• v.2 no.2
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• pp.166-171
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• 2014

This experimental study considers manufacturing method of the non-portland cement matrix for the light-weight building materials using blast furnace slag, paper ash, fly ash and polysilicon sludge the industrial by-product. For the experiment, we used paper ash by means of the foaming agent and alkali activator to make non-portland cement light-weight matrix. Various specimens were prepared with different types and addition ratios of the alkali activator. Then, the properties of these specimens were investigated by compressive strength test, bulk specific gravity. As a results, it was judged that experiment results of non-portland cement matrix with specific waste resources and alkali activators were useful as basic data for mixtures design and evaluation properties of lightweight non-portland cement building material.

• Analytical Science and Technology
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• v.23 no.3
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• pp.255-260
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• 2010

The Ministry of Environment simultaneously revised testing methods and emission standards of adhesives product on the "Law of indoor air quality management" for the effective management of the building materials releasing pollutants in great quantities. Accordingly, it is impossible to compare original standards with revised standards directly. The influences of each factor of the revised testing methods of adhesive product on the emission rate of pollutants are reviewed through comparing with the original testing method. Through this study, revised pollutant emission control standards were assessed. With the result that it is found that emission rate of adhesives product is weakened two and half times by changing test period and the emission rate resulting from changing drying time has little difference. As a result of comparing TVOC emission standards with the original testing method considering the modification of testing methods, it is found that the emission standard through this revision is strengthened about 2.1 times more than that of present testing method.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2001.04a
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• pp.89-89
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• 2001

종이는 목재섬유와 물의 현탁액을 스크련을 통해 균일하게 분산시킨 판상섬유 제품 으로서 가격이 저렴하고, 열, 전기절연성, 필터기능, 난연성 및 폐기성이 우수하여 다양한 분 야에서 활용되고 있다. 특히 최근에는 종이의 고부가가치화, 차별화를 위하여 내열성, 전기 절연성, 내수성, 기계적 특성, 내약품성, 생체적응성을 지닌 다양한 기능지가 개발되어 식품, 전기, 전자, 건축, 화학, 의료 관련 산업에 있어서 주요 재료로 이용되고 있다. 특히 전기, 전 자산업 발전과 더불어 전기절연성이 우수한 종이의 역할과 수요는 크게 증대되고 있으며 산 업발전의 핵심적인 제품으로서 자리매김을 하고 있다. 하지만 국내의 경우 전기절연지와 관 련된 제품 및 생산기술 부족으로 전량을 수입에 의존하고 있는 실정이며, 그 수입량은 앞으 로 전기 및 전자 산업의 발전으로 인해 더욱 증가할 것으로 예상된다. 이러한 수입의존성을 극복하기 위해서는 전기절연지와 관련된 제품개발 및 생산기술에 관한 연구가 시급히 요청 되고 있다. 이러한 기술의 국산화는 수입 대체 효과 뿐만 아니라 관련 산업의 발전에도 기 여할 수 있을 것으로 예상되며 수출산업으로 성장할 수 있을 것으로 예상된다. 종이의 전기적 성질은 유전상수, 유전손실율과 같은 유전적 특성과 전기저항, 절연 파괴강도의 기계적 특성으로 구분할 수 있다. 종이의 전기적 성질 가운데 유전율은 전기장 에 대한 종이의 물리화학적인 반응으로 일반적으로 종이의 밀도와 종이를 구성하는 성분의 쌍극자 모멘트에 비례하며 온도에 따라서도 변화한다. 일반적으로 온도가 상승하면 열에너 지를 얻게된 쌍극자가 전기장에 배열됨으로써 유전율이 상승하지만 온도가 유리전이점 이상 으로 높아질 경우 열적 교란에 의해서 분극 능력이 감소하게 되어 유전완화 현상이 나타난 다. 전기절연지로 사용될 종이의 절연특성을 이해하기 위해서는 사용환경에 따른 유전적 특 성 및 tan$\delta$에 관한 연구가 펼요하다. 본 연구에서는 종이의 유전특성을 개선하기 위해서 펼름형성능력이 우수한 polyvinyl alcoholCPV A)과 aery lonitrile을 이용하여 시아노에틸화한 P PYA의 표면처리에 따른 종이의 유전적 특성의 변화를 검토하였다. 그 결과 PYA에 도입된 시아노에틸기에 의해 유전율을 증가시킬 수 있음을 확인하였다. 또 본 연구에 적용된 시험 범위에서는 온도상승에 따라 유전율이 상승하였다.