가정용 Video기기의 기술개발 현황과 전망

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

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.

대기확산모델 AERMOD에 의한 소각장 주변 대기오염물질 기여도 평가

이해승(Hae-Seung Lee ) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계

본 연구는 U.S. EPA에서 권장하는 우선모델인 AERMOD(AMS/EPA Regulatory Model)를 예측모델로 선정하여, 소각장에서 배출되는 환경오염물질이 주변 대기환경에 미치는 기여도를 평가하기 위하여 수행되었다. AERMOD는 미국기상학회와 미국환경보호청(EPA)이 공동으로 ISC3 모델의 단점을 보완하기 위해서 개발한 확산모델이다. ISC3 모델에서는 공간적으로 수평연기확산계수(σy) 및 연직연기확산계수(σz)가 일정하다는 가정을 사용하였으나, 실제 대기에서는 고도에 따라 그 값들이 크게 변하는 특성이 있다. 그러나 AERMOD에서는 고도에 따른 연기확산계수 및 풍속의 변화를 대기경계층 상사이론(Similarity theory)을 이용하여 계산해 확산모델에 반영하여 대기 상태가 공간적으로 균일하다는 가정을 보완한 모델이다. 소각장 배출구에서 확산되는 오염물질 항목은 환경정책기본법 중 대기 환경기준적용 항목인 NO2, CO, SO2, PM10과 지정악취물질인 NH3, H2S를 대상 항목으로 설정하였으며, 모델링에 필요한 배출량 입력자료는 기오염물질의 경우 소각장 굴뚝에서 배출되는 농도, 지정악취물질은 자가측정에 따른 배출농도를 적용하였다. 대기오염물질 확산 모사를 위해 연구대상 소각장을 중심으로 반경 2.5 km 영역을모델링 영역으로 설정하였으며, 모델링 격자의 크기는 100 m로 50 × 50개 격자로구성하였다. 대기오염물질 측정지점과 동일 지점을 영향예측지점으로 선정하여, 실제 측정 농도와 모사농도의 차를 이용하여 소각장에서 배출되는 오염물질이 주변지역에 미치는 기여도를 평가하였다.

조립품 심(seam)의 갭(gap)에 대한 정량적 심미평가의 기초연구

이해승(Haeseung Lee),이래우(Raewoo Lee),임현준(Hyunjune Yim) (사)한국CDE학회 2011 한국CDE학회 논문집 Vol.16 No.5

Esthetic appeal of a product is often affected by the appearance quality of seams forming between components of the product. The appearance quality of seams is, however, assessed in a very subjective and qualitative manner that heavily depends on the evaluator. This paper presents a preliminary study to quantify such assessment by formulating a quantitative index which is a linear function of the seam gap sizes, seam gap ranges, and the size uniformity of seam gaps. By considering a highly simplified problem of a drawer system and utilizing subjective assessments by twenty evaluators, the index has been formulated. The validity of this index has been confirmed by observing its behavior with changes of the component tolerances. Also, the utility of this index has been demonstrated through a selective assembly scheme applied to the drawer system problem. Though the index formulated in this study for seam appearance quality may be useful, future studies are necessary to make the model readily applicable to real problems.

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℃.

마이크로채널 열교환기에서 R-134a의 증발열전달 특성에 관한 실험적 연구

이해승(Haeseung Lee),전동순(Dong-Soon Jeon),김영률(Young-Lyoul Kim),김용찬(Yongchan Kim),김선창(Seon-Chang Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.2

마이크로채널 열교환기에서 R-134a의 증발열전달 특성에 관하여 실험적 연구를 수행하였다. 마이크로 채널은 금속박판인 SUS304에 포토에칭 공정으로 식각되었으며, 13개의 금속박판은 차례로 적층되어 확산접합 공정을 통하여 접합되었다. 본 연구에서는 R-134a의 증발온도, 질량유속 그리고 물의 입구온도의 변화에 따른 열전달 특성을 대향류 조건에서 실험하였다. 실험결과 R-134a와 물의 입구온도차가 클수록 증발열전달량은 증가하였으며, 증발열전달계수는 0.67 ㎾/㎡ ?℃에서 6.23 ㎾/㎡ ?℃이었다. 아울러 마이크로채널 열교환기에서 R-134a와 물의 열교환에 따른 증발열전달 특성에 영향을 미치는 Reynold수와 무차원 온도비 θ를 도출하여 Nusselt수에 관한 실험적 상관식을 제안하였다. An experimental investigation was carried out to examine the evaporative heat transfer characteristics of R-134a in a micro-channel heat exchanger. The micro-channel heat exchanger used in this study was a sort of plate heat exchanger. Micro-channels were fabricated on the SUS304 plate by the photo-etching process: 13 sheets of plates were stacked and bonded by the diffusion bonding process. The effects of the evaporating temperature, mass flux of R-134a, and inlet temperature of water were examined. As the difference between the inlet temperatures of R-134a and water increased, the heat transfer rate increased. The evaporative heat transfer coefficients obtained in this study range from 0.67 to 6.23 ㎾/㎡ ?℃. The experimental correlation for the Nusselt number as a function of the Reynold number and θ was suggested for the micro-channel heat exchanger.

쓰레기 매립지 가스포집관에서 유출가스 계측에 관한 연구 1 : 유량계 계측오차의 최소화를 위한 해석

이해승(Hae-Seung Lee),이찬기(Chan-Ki Lee) 강원대학교 환경연구소 1998 環境硏究 Vol.15 No.-

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.