가정용 Video기기의 기술개발 현황과 전망

이해승,Lee, Hae-Seung 한국전자정보통신산업진흥회 1986 電子振興 Vol.6 No.7

채널 형상에 따른 마이크로채널 열교환기의 증발열전달 특성 및 압력강하에 관한 실험적 연구

이해승(HaeSeung Lee),김선창(Seon-Chang Kim),김영률(Young-Lyoul Kim),전동순(Dong-Soon Jeon),김용찬(YongChan Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11

Experimental investigations have been carried out to examine the evaporative heat transfer characteristics of R-134a in micro-channel heat exchangers with straight and zigzag 15° and 30° channel. The micro-channels heat exchangers used in this study is a sort of plate heat exchanger. Micro-channels were fabricated on the SUS304 plate by photo-etching process : 13 sheets of plate were stacked and bonded by diffusion bonding process. Effects of difference in Reynolds number with R-134a and that of difference in heat transfer areas have been examined under counter flow condition. The heat transfer rate of zigzag 15° and 30° has increased about 1.1~1.2 times compared with the straight, and the pressure drop also increased about 1.1~1.4 times. The evaporative heat transfer coefficients obtained in this study range from 0.97 ㎾/㎡ㆍ℃ to 7.85 ㎾/㎡ㆍ℃.

매립가스 발생량에 따른 자원화 가능성 평가

이해승(Lee, Hae-Seung) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.10

본 연구는 신재생에너지 활용을 위하여 강원도의 B 지자체를 대상으로 폐기물 발생특성에 따른 매립가스 발생량 및 자원화 가능성에 대하여 연구하였다. B 지자체의 생활폐기물 평균 겉보기 밀도는 144 ㎏/㎥로, 가스 물질 및 연료화 가능성 물질인 가연성 평균 폐기물 조성비는 종이류 36.0 %, 비닐·플라스틱류 21.6 %, 음식물류 19.7 %로 조사되었다. 발열량 분석결과, 고위발열량(습 윤) 3,471 ㎉/㎏, 저위발열량(습윤) 2,941 ㎉/㎏ 로 측정되었으며, 특히 음식물류 폐기물의 매립지 직매립이 금지된 후 에는 발열량이 높은 종이류와 비닐·플라스틱의 비율이 증가하여 발열량이 증가한 것으로 나타났다. 매립지에서 발생 하는 메탄가스는 2021년(2,505.7 CH₄ ton/year)을 정점으로 점차 감소하는 것으로 예측되었는데, 특히 RDF(Refuse Derived Fuel) 제조시설이 설치되면 2013년(1,956.9 CH₄ ton/year)을 정점으로 감소되는 것으로 예측되었다. B 지자체 의 매립지에서 발생하는 매립가스(Land Fill Gas; LFG) 추정량은 9.92 ㎥/min 로 예측되어 타 지자체에서 발생하는 매립가스 추정량(10.11 ㎥/min)과 유사하게 조사되었다. This study was performed to the municipal waste generation amounts and characteristics for B city in Gangwon province, predicted the methane gas generation rate emitted from landfill, and analyzed the possibility of energy recovery to RDF(Refuse Derived Fuel) using combustible waste. The study results showed that the average bulk density of municipal waste for B city was 144.0 ㎏/㎥, and the average ratios of combustible waste were 36.0 % of paper, 21.6 % of vinyl, and 19.7 % of food waste. respectively. In the experiment for heating value, high and low heating value(moisture) was measured to 3,471 ㎉/㎏ and 2,941 ㎉/㎏, respectively. After the prohibition of burying of food waste in landfill, the heating value of municipal waste was dramatically increased due to increase of the ratio of paper, vinyl, and plastic waste. The prediction results of methane gas generation rate emitted from landfill showed that the gas generation rate is increasing to 2,505.7 CH₄ ton/year in 2021. After then, the rate is decreasing gradually. When the RDF facility is installed, the rate is decreasing after peaking at 1,956.9 CH₄ ton/year in 2013. The generation rate of LFG emitted from waste landfill of B city was analyzed to 9.92 ㎥/min, similar to 10.11 ㎥ /min for other city.

친환경적 복구를 위한 비탈면 붕괴원인 분석

이해승 ( Hae-seung Lee ),박병수 ( Byung-soo Park ) 한국환경기술학회 2016 한국환경기술학회지 Vol.17 No.3

본 연구는 실제 붕괴가 발생한 비탈면의 붕괴 원인 규명을 위한 연구이다. 현장조사를 통해 불연속면 특성을 파악하고, 사면 굴착단계를 고려한 한계평행해석을 통하여 안전율의 변화를 알아보았다. 또한, 유한요소해석을 통해 사면내 전단변형률의 발달 경로를 추적하므로써 현장에서 관찰된 인장균열 등과의 연관성을 파악하였다. 한계평형해석결과, 굴착에 의한 응력해방이 비탈면내 전단응력을 증가시키고, 당초 설계조건에서 예측되지 못한 단층 파쇄대가 깊게 형성됨에 따라 비탈면의 전단저항력이 감소되어 비탈면 붕괴원인으로 작용한 것으로 나타났다. 한편, 유한요소해석 결과, 단계별 굴착에 따라 소성변형이 비탈면 하부에서 상부로 확대되었으며 그 위치는 추가활동이 발생한 상부의 인장균열 관측지점을 시점과 유사하였다. This study is for the investigation of really occurred collapse. Characteristics of discontinuity was investigated by field test. Change of safety ratio was investigated by limit equilibrium analysis considering slope excavation steps. Furthermore, correlation with observed tension crack was estimated by trace of development rout of shear deformation rate in the slope using finite element analysis. From the results of limit equilibrium analysis, it was found that the release from stress by excavation can increase the shear stress in slope face. Fault shattered zone decreased the shear resistance of slope face and caused the collapse. By the way, from the results of finite element analysis, plastic deformation was extended from the bottom to the top place of face slope. And the place was similar to the observed place of tension crack.

강원 영동지역의 관광철 폐기물 및 발열량 특성

이해승(Hae-Seung Lee),최용범(Yong-Bum Choi) 대한환경위생공학회 2006 대한환경위생공학회지 Vol.21 No.1

When we looked at the seasonal food dregs of the eastern side of gangwondo, gangneung city's summer and winter food dregs showed 25.9 and 25.8% respectively due to the presence of beach areas and ski resorts. Sokcho city showed 28.12% in summer and yangyang gun's summer food dregs showed 40.2%. Yangyang gun's august food dregs showed 2.7 times larger than annual average amount. Outlook density showed regional characteristics. Data showed that food dregs' amount rate has been reduced gradually from 2005 because of the prohibition of direct filling up. As a result of compositions analysis, the eastern side of gangwondo's water fraction of living dregs were lower than that of chuncheon city where is located at the gangwondo's inland area. chuncheon city's data showed residential areas 53.5%, community areas 56.8% and commercial areas 55.6%. These discrepancies caused by the characteristics of dregs discharge type and climate. The caloric value of dregs has been increased incrementally after the ban of food dregs' direct filling up. Therefore, heating value of the dregs exceeds the existing furnace design spec and it can cause high caloric value problems, so we need additional research to solve these problems.

환경성평가를 통한 비위생 매립지 정비방안

이해승(Hae-Seung Lee) 대한환경위생공학회 2008 대한환경위생공학회지 Vol.23 No.3

In this study, we intend to present the uncontrolled landfill maintenance plans by diversely reviewing the operating conditions of landfill and environmental effects and economical issues resulted from the operation of landfill for the purpose of suggesting the optimal maintenance plans applicable to the uncontrolled landfill and unused landfill located in Korea. We perform the basic and precise surveys against three landfill sites showing the biggest problem out of 8 unsanitary landfills sites located in Y County. We compare and review the treatment plans prepared and operated by the N Landfill. The compared and reviewed results show that the local stabilization plan is more effective than the excavation and transfer treatment plan when considering the economic efficiency only. However, the excavation and transfer treatment plan is valid when considering the diverse elements. The G Landfill is operated with separated into living waste landfill section and construction waste landfill section. However, some landfill gas collection bores or holes are installed in its living waste landfill section, which has not been used for about 20 years, as a part of follow-up control. The element causing the environmental damage is considerably reduced in its living waste landfill section. However, the effort to keep the follow-up control through the local stabilization work is required. The landfill is under processing in the construction waste landfill section. However, most of buried wastes are the inorganic wastes such as waste materials and concrete, so the maintenance plan focused on the use of top land by installing the local stabilization facilities is considered as an effective plan. The landfill is under processing in the K Landfill. It seems to be difficult to maintain this landfill through the local stabilization. The excavation and transfer treatment plan to completely remove the potential environmental pollution source. is considered as the valid plan.

마이크로채널 열교환기에서 채널 굽힘 각도에 따른 R-134a의 증발열전달 특성에 관한 연구

이해승(Hae-Seung Lee),전둥순(Dong-Soon Jeon),김영률(Young-Lyoul Kim),김선창(Seon-Chang Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.6

마이크로채널 열교환기에서 채널 굽힘 각도에 따른 R-134a의 증발열전달 특성에 관하여 실험적 연구를 수행하였다. 본 연구에서는 채널의 굽힘 각도가 120°, 150° 및 180°인 마이크로채널 열교환기에서 R-134a의 증발온도와 Reynolds수 변화에 따른 열전달 특성을 대향류 조건에서 실험하였으며, 실험결과 마이크로채널 열교환기에서 증발열전달량과 증발열전달계수는 R-134a의 레이놀즈수 증가에 따라 증가하였다. 또한 채널의 굽힘 각도가 120° 및 150°인 마이크로채널 열교환기는 증발온도 4.9~14.9 ℃에서 채널굽힘 각도가 180°인 마이크로채널 열교환기와 비교하여 평균 약 17.1% 및 13.3%로 증발열전달량이 증가하였으며, R-134a의 증발열전달계수는 채널의 굽힘 각도가 작을수록 증발열전달계수가 증가하는 것으로 나타났다. Experimental investigations have been carried out to examine the evaporative heat transfer characteristics of R-134a with the channel-bending angle (CBA) in microchannel heat exchangers. In this study, we examined the effects of evaporation temperature and Reynolds number of R-134a on the evaporative heat transfer characteristics of R-134a in microchannel heat exchangers with CBAs of 120°, 150°, and 180° under counterflow conditions. Experimental results show that the evaporative heat transfer rate and evaporative heat transfer coefficient increased with an increase in the Reynolds number of R-134a. Further, the evaporative heat transfer rate corresponding to CBAs of 120° and 150° increased to values greater than the evaporative heat transfer rate corresponding to 180° by approximately 17.1% and 13.3%, respectively, for evaporating temperatures in the range 4.9?14.9℃. The evaporative heat transfer coefficient was affected by the channel angle with increasing evaporative heat transfer coefficient at small channel bending angle.

폐기물처리시설 입지선정에 따른 사례연구

이해승(Hae-Seung Lee) 대한환경위생공학회 2004 대한환경위생공학회지 Vol.19 No.1

This study is to investigate the present condition of waste disposal establishment and to analysis problems which could be produced at location selection formalities of waste disposal establishment. It proposed building methods of waste disposal establishment to lead spontaneous participation of local resident according to case analysis of waste disposal establishment.<br/> There are research results; i) Opposition of inhabitants was the majority of reason at the business abandonment or delay of waste disposal establishment. Therefore agreement formation course with local inhabitants is most important position. ii) Many estimate have been needed for waste disposal establishment, but support estimate of government was 30-50% that is really low compare with other environmental establishment. So that it need to increase of government estimate. iii) Location collection is carried out based on law and final collected location must be executed without delay of relation business as soon as possible. iv) Standard of location collection has to divide into small, middle and large size and to apply with same rule according to divided location. v) It must be change public subscription before and location selection after and maintain continuance of information offer to local inhabitants and offered information. vi) after building of waste disposal establishment for solving distrust of waste disposal establishment. It must be planed and carried on useful support countermeasure to local inhabitants in actuality.

주파수 영역과 시간 영역의 특성을 고려한 래틀 소음 평가 Process에 대한 연구

이해승(Lee Hae Seung),채창국(Chae Chang Gook) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Recently, the interior sound of vehicle is reduced drastically. So the whine. rattie, and pattern noises which were not so important are getting more and more crucial in deciding NVH characteristics and productivity. In traditional method. Rattle sound was rated by subjective evaluation than objective analysis. And we had to spend much time and cost on evaluating the rattle noise. by human ear. Moreover. subjective evaluation may result in error because of human's fatigue. In this research, We modeled rattle index by consider ing characteristics of time and frequency domain and proposed rattle index which was certified by subjective rating.

강원 동해안지역의 생활폐기물 발생특성

이해승(Hae-Seung Lee),최용범(Yog-Bum Choi),김병욱(Byoung-Ug Kim) 대한환경위생공학회 2005 대한환경위생공학회지 Vol.20 No.1

This research was performed to investigate the generation and physico-chemical characteristics of municipal solid wastes in the east coast of gangwon. The results were as follows:<br/> ⅰ) The generation rate of G city and Y gun were 0.187-0.384 ㎏/cap/d and 0.136-0.259 ㎏/cap/d. Apparent density of G city and Y gun were 137.9-191.9 g/L and 157.3-238.3 g/L, respectively. ⅱ) The wastes consisted of 76.1-97.5% of combustibles and 2.5-23.9% of incombustibles in G city. And the wastes consisted of 73.7-98.6% of combustibles and 1.4-26.3% of incombustibles in Y gun. Most of municipal solid wastes are composed of food, paper, and vinyl-plastics waste. Water content of commercial area, agricultural resident, detached resident, apartment area, school zone were 42.5-45.9, 37.6-43.4, 32.4-38.4, 29.3-32.3, 6.8-26.9%, respectively. ⅲ) The low heating value of G city and Y gun were 1,125.5-2,540.7 kcal/㎏, 1,104.4-2,062.3 kcal/㎏, and school and apartment area were higher than commercial area.