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이효은,김영재,박수오,성유현,박찬오,이현주,장민,이영재,Lee, Hyo-Eun,Kim, Young-Jae,Park, Soo-Oh,Sung, Yoo-Hyun,Park, Chan-Oh,Lee, Hyun-Ju,Jang, Min,Lee, Young-Jae 대한자원환경지질학회 2011 자원환경지질 Vol.44 No.6
활성탄과 자외선을 이용한 시안 저감 연구를 위해 다양한 농도조건 및 넓은 pH 범위에서 배치실험을 수행하였다. 활성탄을 이용한 시안흡착은 시안의 초기농도 2 mg/L 이하에서 매우 효율적인 것으로 나타났으며, 시안 초기농도 3 mg/L 이하에서는 pH 7.0 에서의 흡착이 우수하였고, 그 이상의 시안 초기농도 구간에서는 pH 9.0일 경우 흡착량이 많은 것으로 관찰된다. 전체적인 흡착 패턴을 봤을 때, pH 9.0 에서는 시안의 초기농도가 증가함에 따라 흡착이 증가하는 양상을 보이는 반면 pH 7.0 에서는 흡착이 감소하는 양상을 보였다. 이는 활성탄의 반응성이 pH에 따라 변화하고 있음을 시사한다. 시간에 따른 시안의 흡착 결과, 반응 후 초기 30분 동안 빠른 흡착을 보이나 3시간 이내에 급격히 탈착되며, 그 이후로는 흡착이 다시 증가하여 최대 흡착에 이르는 양상을 보이고 있다. 이는 활성탄을 이용한 시안의 초기 흡착모드가 시간에 따라 변화하고 있음을 나타내고 있다. 탈착실험 결과, 활성탄에 흡착된 총 시안 중 최대 1.5%의 탈착을 일으키는 것으로 나타났다. 그밖에 활성탄과 함백탄광슬러지의 혼합물을 이용한 시안흡착은 0.76 mg/g의 낮은 저감효율을 나타냈다. 자외선에 의해서는 최대 96.6%의 매우 효율적인 저감을 보였으며, 시안의 초기농도가 높아질수록 활성탄을 이용한 시안의 저감보다 많은 양의 시안을 저감시키는 것으로 관찰된다. 이번 실험결과는 활성탄과 자외선 모두가 다양한 조건의 환경에서도 시안저감에 효율적일 수 있다는 것을 보여준다. Sorption of cyanide on granular activated carbon and attenuation of the cyanide by UV-light over a wide range of conditions such as pH and concentration were investigated through batch experiments. Cyanide uptake by activated carbon is much effective at $[CN]_{ini}$ < 2 mg/L. The sorption of cyanide on activated carbon at pH 7.0 is greater than that of pH 9.0. It is found that the ratio of CN uptake to CN in solution increases at pH 9.0 whereas at pH 7.0 the ratio decreases, suggesting that reactivity of activated carbon increases as a function of pH. The sorption of cyanide rapidly increases during the first 30 min, followed by sharp desorption until 3hr, and then the sorption increases and reaches the maximum sorption during the duration of experiments, implying that the sorption mode could be changed through conformational change during the initial stage of the cyanide uptake by activated carbon. Total amount of cyanide desorbed from the activated carbon during the period of desorption experiments is less than 1.5% of total sorbed cyanide, indicative of strong and stable sorption of cyanide on the activated carbon. The sorption with mixture of activated carbon and Ham-Baek sludge shows less effective on the removal of the cyanide. It is noted that UV-light is much effective on the removal of cyanide but also the attenuation is achieved until $[CN]_{tot}$ is up to 10 mg/L. Our findings demonstrate that both activated carbon and UV-light are very effective on the attenuation of cyanide over a wide range of environmental conditions.
이효은(Hyoeun Lee),김강희(Kanghee Kim),이길호(Kilho Lee) Korean Institute of Information Scientists and Eng 2021 정보과학회논문지 Vol.48 No.5
This paper presents a method of probabilistically analyzing the end-to-end response time from sensing to actuation in autonomous vehicle computing systems. The end-to-end response time is used to evaluate vehicle responsiveness and to derive various indicators of vehicle safety. For example, given the end-to-end response time from sensing an obstacle to stopping the vehicle, an upper limit of the vehicle’s speed may be defined. In addition, the proposed analysis may be used to determine how many computing resources should be invested in improving vehicle responsiveness. This paper proposes a safe analytical method under the assumption that ERF (Earliest Release First) scheduling is used and that each task is pinned to a certain CPU, and presents the results of the responsiveness of an open source autonomous driving stack called Autoware.
이효은 ( Hyeo Eun Lee ),권오성 ( Oh Sung Kwon ) 한남대학교 사회과학연구소 1996 사회과학연구 Vol.6 No.-
This paper investigates recent development of telecommunications policies of ASEAN member countries, which are experiencing most dynamic economic development in the world. We also try to compare relative competitiveness of information and telecommunications industries by using descriptive indices including RCA. Our findings are that market opening to foreign capital, introduction of competition and deregulation are general trends in telecommunications service markets of these countries and that the industry`s competitiveness of these countries have been greatly improved in recent years.
ODDLY-다감각 자극을 통한 스트레스 관리 디지털 명상 콘텐츠
이효은(Hyo-Eun,Lee),강원빈(Won-Been,Kang),최수연(Soo-Yeon,Choi),최수진(Soo-Jin,Choi) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
스트레스 관리를 하지못하고 방치하는 바쁜 현대인들의 오감을 자극하여 스트레스 해소 및 관리를 도와주는 애플리케이션 서비스로,색채심리를 기반으로 제작된 VR 디지털 힐링 콘텐츠를 통해 일종의 디지털 명상을 즐길 수 있게 하였다.
도시열섬현상 저감을 위한 PCM(Phase Change Material)의 단열성능 시뮬레이션 분석
이효은(Lee, Hyo Eun),양영권(Yang, Young Kwon),정민희(Chung, Min-Hee),박진철(Park, Jin Chul) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.6
This study aimed to analyze the Thermal Insulation Performance of the PCM Cool Roof System, which is being developed for mitigating the Urban Heat Island Effect. We compared the performance of common insulation material versus that of PCM, both applied on a standard roof model. We found that PCM had less cooling energy consumption compared to common insulation, whereas common insulation had less heating energy consumption. The annual total energy consumption was found to be lower when using PCM. Therefore, we conclude that the PCM Cool Roof System has insulating capacity comparable to that of common insulation.