• 한국주거학회논문집
• /
• 제24권6호
• /
• pp.189-197
• /
• 2013

The purpose of the study was to analyze the improvement elements depended on housing quality measurement tool related to mental health. The data for the analysis was collected through questionnaire survey method from November 1, 2012 to January 17, 2013, and the sample consisted of 720 respondents living in single detached houses, multi-families detached houses, apartments, and town houses in 4 cities, Seoul, Busan, Daejeon, and Kwangju. The data were analyzed using descriptive statistics. The results of improvement elements are as follows: 1) Pedestrian-threaten street from cars in physical safety 2) A secluded or dark spot and fear of walking at night in social security, 3) Indoor noise, outdoor noise, and evidence of abandoned trash heap/bottle in neighborhood in health & sanitation, 4) Illegal parking and heating control system in facility convenience, 5) Extra kitchen, number of bathrooms, and community spaces in space convenience, 6) Openness and spaciousness of indoor room, and satisfaction of house and neighborhood in comfort, 7) Management common/sharing space in maintenance, 8) Energy saving facility and environment friendly materials use in sustainability, 9) Burden on housing cost, asset value on house, and school district in economic value, 10) Reflection of residents style, surrounding building's number of layers, and neighborhood appearance of preference in housing environment image.

• 생물환경조절학회지
• /
• 제28권3호
• /
• pp.243-254
• /
• 2019

본 연구에서는 전국을 대상으로 태양광에너지와 관련된 기상 및 지형 대리변수를 고려하여 태양광발전 시설에 대한 취약지역을 분석하였으며, GIS를 이용하여 공간분석을 통해 태양광발전 시설의 적정입지에 대한 평가용 지도를 개발하였다. 본 연구에서 최종적으로 개발된 태양광발전 시설에 대한 취약지도에서는 '취약단계 5(매우 취약)' 지역과 '취약단계 1(매우좋음)' 지역은 나타나지 않았다. '취약단계 4(취약)' 지역은 전라남도가 가장 크게 나타났으며, '취약단계3(보통)' 지역은 광주광역시, 전라북도, 충청북도 및 강원도 등 다수의 행정구역에서 높은 것으로 나타났다. '취약단계 2(좋음)' 지역은 대구광역시, 울산광역시 및 인천광역시 등이 높은 것으로 나타났다. 현재 운영되고 있는 태양광발전소 30곳을 비교 검토한 결과, 대부분 취약단계 2 및 3단계 지역에 위치하며, 상대적으로 태양광에너지가 적합한 지역에 위치함을 나타냈다. 하지만 본 연구의 한계점인 태양광발전소의 제한적인 자료량으로 인해 본 연구결과의 정확성을 명확하게 평가하기는 어렵다. 그럼에도 불구하고 본 연구에서는 GIS 공간분석 기법을 이용하여 다양한 기상 및 지형요소들을 고려하여 전국을 대상으로 태양광발전시설에 대한 취약지도 평가를 시도하였으며, 국내 전 지역에 대한 자료를 제시함으로써 태양광발전과 관련된 부분에 기초자료로 활용할 수 있을 것이다.

• 유기물자원화
• /
• 제20권4호
• /
• pp.61-74
• /
• 2012

우리나라는 1960년대에 들어서 경제개발계획의 수립과 더불어 산업발전 정책이 강력히 추진되기 시작하며 많은 산업단지가 조성되어 있다. 현재는 지속적인 발전이 가능한 산업단지로 만들기 위하여 정부에서는 산업단지에서 발생되는 부산물과 폐기물을 다른 기업의 원료나 에너지로 재활용하는 생태산업단지 구축사업을 추진하고 있다. 이와 관련하여 본 연구에서는 연구대상지역인 A 산업단지에서 발생되는 슬러지의 물리화학적 특성을 분석하였고, 슬러지의 에너지화 시설 설치에 따른 경제성 및 부대효과를 분석함으로써 사업화 가능성을 검토하였다. 연구대상지역인 A산업단지에서 발생되는 슬러지발생 업종의 비율은 92%가 석유 화학업종인 것으로 분석되었다. 이렇게 발생된 슬러지는 매립>소각>>재활용>해양투기의 순으로 처리되고 있는 것으로 조사되었으며 슬러지를 채취하여 분석한 결과 발생량 가중치 평균으로 3,891kcal/kg인 것으로 분석되었다. 분석된 기초 데이터를 바탕으로 건조시설과 열병합 발전소를 설치하여 운영 할 경우 설치비용, 운영비용, 운영이익을 산출하였고, 총 8가지 Case로 분류하여 흑자전환유무 및 그 시점에 대한 시뮬레이션을 하였다. 분석결과 건조시설과 열병합발전소를 설치 운영하며 국고지원을 받을 경우 3년에 원금회복 후 4년째부터 흑자를 나타낼 것으로 분석되어 사업화 경제성이 있는 것으로 평가되었다.

• 한국태양에너지학회:학술대회논문집
• /
• 한국태양에너지학회 2009년도 춘계학술발표대회 논문집
• /
• pp.139-144
• /
• 2009

The generation of small hydropower as compared to other different developed environmental methods produces one of the clean energies. In such manner, various application system development through IT technique is being developed for an advanced small hydropower energy resources data mining. However, existing data analysis of New & Renewable Information System for small hydropower resources application is incomplete therefore it limits expressing these information on the Web. Thus for positive usage of small hydropower resources, a more systematic and precise analysis system should be built. This study seeks to develop a map of the domestic small hydropower resources problems to further improve small hydropower resources, developed through Package Tool which can accurately evaluate a wide range of small hydropower basin in a short period of time. Small hydropower Package Tool was calculated using existing Analysis System small hydropower resources which did not provide diverse capabilities resulting to 840 standard basin classified by A and facility capacity, etc., and to assume a 40% annual capacity, expected annual electricity production was calculated. Small hydropower for the national water system of small hydropower resources potential calculated in terms of resources for the development of small hydropower will be utilized as basic data.

• Nuclear Engineering and Technology
• /
• 제41권5호
• /
• pp.617-648
• /
• 2009

Under the government supported long-term nuclear R&D program, the severe accident research program at KAERI is directed to investigate unresolved severe accident issues such as core debris coolability, steam explosions, and hydrogen combustion both experimentally and numerically. Extensive studies have been performed to evaluate the in-vessel retention of core debris through external reactor vessel cooling concept for APR1400 as a severe accident management strategy. Additionally, an improvement of the insulator design outside the vessel was investigated. To address steam explosions, a series of experiments using a prototypic material was performed in the TROI facility. Major parameters such as material composition and void fraction as well as the relevant physics affecting the energetics of steam explosions were investigated. For hydrogen control in Korean nuclear power plants, evaluation of the hydrogen concentration and the possibility of deflagration-to-detonation transition occurrence in the containment using three-dimensional analysis code, GASFLOW, were performed. Finally, the integrated severe accident analysis code, MIDAS, has been developed for domestication based on MELCOR. The data transfer scheme using pointers was restructured with the modules and the derived-type direct variables using FORTRAN90. New models were implemented to extend the capability of MIDAS.

• 방사성폐기물학회지
• /
• 제18권4호
• /
• pp.517-536
• /
• 2020

The radionuclide inventory in radioactive waste from nuclear power plants should be determined to secure the safety of final repositories. As an alternative to time-consuming, labor-intensive, and destructive radiochemical analysis, the indirect scaling factor (SF) method has been used to determine the concentrations of difficult-to-measure radionuclides. Despite its long history, the original SF methodology remains almost unchanged and now needs to be improved for advanced SF implementation. Intense public attention and interest have been strongly directed to the reliability of the procedures and data regarding repository safety since the first operation of the low- and intermediate-level radioactive waste disposal facility in Gyeongju, Korea. In this review, statistical methodologies for SF implementation are described and evaluated to achieve reasonable and advanced decision-making. The first part of this review begins with an overview of the current status of the scaling factor method and global experiences, including some specific statistical issues associated with SF implementation. In addition, this review aims to extend the applicability of SF to the characterization of large quantities of waste from the decommissioning of nuclear facilities.

• KEPCO Journal on Electric Power and Energy
• /
• 제7권1호
• /
• pp.93-99
• /
• 2021

The government has proposed a mission to enhance intelligent power networks, decrease coal-fired generation, expand distributed energy resources, and promote energy prosumer into the distribution network in Korea. Installation cost of facility expansion to guaranteed interconnection with small distributed energy resources increases dramatically on KEPCO's distribution sector. And it is hard to withdraw in time. In addition, there are explicit research is required to meet the reliability on grid corresponding to the increase of distributed power. Infrastructure support for accommodating energy prosumer is also needed. Therefore, KEPCO is pushing transition to DSO by expanding distribution management scope and changing its roles. In addition, KEPCO is proactively preparing for integrated operation between distribution network and existing distributed power which is accommodated passively. KEPCO is also trying to accept multiple network users, e.g. building platforms, to manage a data and promote new markets. In the long term, transition to DSO will achieve saving investment costs for accommodating distributed sources and maintaining stable electrical quality. And it will be possible to create new business model using the platform to secure revenue.

• 한국항해항만학회지
• /
• 제28권3호
• /
• pp.269-276
• /
• 2004

매립지는 도심부 혹은 내륙지역과는 달리 독특한 지형적 자연환경 특성을 가지고 있으며 내륙지역에 비해 낫은 기온, 강한 바람, 과다한 일사조건, 해염을 포함한 습기라는 기후적 악조건을 가지고 있다. 따라서 워터프런트를 개발할 경우는 매립에 따른 기후환경 특성을 상세하게 파악하여 적합한 개발 및 체계적인 유지관리가 필요하다. 워터프런트의 지형적, 기후적 특성을 충분히 검토하지 않고 개발을 추진한 경우 기후환경의 악화와 더불어 시설의 하자발생 및 부정확한 설비용량 산정에 따른 에너지비용 및 유지관리비용의 상승이 초래될 수 있다. 본 연구에서는 현재 매립ㆍ개발이 진행되고 있는 부산 신항만지역의 환경친화적 에너지 수급계획을 위하여 신항만지역의 표준기상데이터를 작성하고, 이를 바탕으로 현재 계획되어 있는 상업ㆍ업무시설과 주거시설을 대상으로 동적 최대 열부하계산을 실시하여 신항만지역 배후도시의 설비용량 산정을 위한 기초자료를 제시하였다.

• 설비공학논문집
• /
• 제30권2호
• /
• pp.83-91
• /
• 2018

A datacenter is a high energy consuming facility whose cooling energy consumption rate is 10~20 times larger than general office buildings. The higher the temperature of supply air from a CRAC (computer room air-conditioner) is supplied, the more energy efficient cooling is possible because of improving the COP of a chiller and advanced range of outdoor air temperature available for the economizer cycles. However, because the temperature of cold air flowing into server computers varies depending on air mixing configurations in a computer room, the proper supply air temperature must be considered based on the investigation of air mixing and heat dissipation. By these, this study aims to understand the effects of variation of the supply air temperature on the air flow distributions, temperature distributions and rack cooling efficiencies. Computational fluid dynamics (CFD) aided in conducting the investigation. As a result, the variation of the supply air temperature does not affect the air flow distributions. However, it mainly affects the temperature distribution. From the results of CFD simulations, Rack cooling indices (RCIHI and RCILO) were evaluated and showed the ideal state set at $19^{\circ}C$ of the supply air temperature.

• Nuclear Engineering and Technology
• /
• 제41권7호
• /
• pp.907-920
• /
• 2009

This study was performed to evaluate the prediction capability of a commercial CFD code and to investigate the effects of different geometries such as a 4.4 mm tube and an 8/10 mm annular channel on the detailed flow structures. A numerical simulation was performed for the conditions, at which the experimental data was produced by the test facility SPHINX. A 2-dimensional axisymmetric steady flow was assumed for computational simplicity. The RNG $\kappa-\varepsilon$ turbulence model (RNG) with an enhanced wall treatment option, SST $\kappa-\omega$ (SST) and low Reynolds Abid turbulence model (ABD) were employed and the numerical predictions were compared with the experimental data generated from the experiment. The effects of the geometry on heat transfer were investigated. The flow and temperature fields were also examined in order to investigate the mechanism of heat transfer near the wall. The local heat transfer coefficient predicted by the RNG model is very close to the measurement result for the tube. In contrast, the local heat transfer coefficient predicted by the SST and ABD models is closer to the measurement for the annular channel.