브라운필드 재개발사업의 문제점과 녹색정화 대응방안 - 재개발 지역의 토양오염에 대한 제도적, 인식적 문제와 기술 발전 방향에 대한 고찰

이광헌,이승우,박준범,Lee, Gwang-Heon,Lee, Seung-U,Park, Jun-Beom 한국지반공학회 2010 지반 : 한국지반공학회지 Vol.26 No.2

제강슬래그로 충전된 컬럼에서의 카드뮴, 구리, 납의 이동성 평가

이광헌,정재식,남경필,박준범,Lee, Gwang-Hun,Chung, Jae-Shik,Nam, Kyoung-Phile,Park, Jun-Boum 한국지하수토양환경학회 2008 지하수토양환경 Vol.13 No.4

Permeable reactive barriers (PRBs) technology has been focused in contaminated groundwater remediation. It is necessary to select adequate reactive material according to characteristics of contaminant in groundwater. In this research, the reaction between reactive material and heavy metal contaminants was estimated through column test. Reactive material was slag, which has been produced in Gwangyang power plant, and heavy metal contaminants were cadmium, lead and copper. Column test was performed in the condition of 1) single and multi contaminated solution and 2) different initial concentration of cadmium. Retardation factor of cadmium is 3.94 in multi contamination. But that of copper is 40.3 in single and 25 in multi. The difference of retardation between cadmium and copper is due to affinity, resulted from the difference of electronegativity. In multi-contamination, copper effluent concentration was above initial copper concentration and at the same time lead effluent concentration was decreased. This phenomenon was considered that lead extract copper sorbed in slag and then lead was sorbed to the vacant sorption site instead. And as the initial concentration was increased, the retardation factor of cadmium became decreased. 폐금속 광산 지역 등지에서 중금속으로 오염된 지하수의 정화 및 오염 확산 방지를 위하여 투수성 반응벽체를 사용할 수 있다. 본 연구에서는 제강슬래그가 중금속 오염지하수의 이동, 확산 방지를 위한 투수성 반응벽체 충전물질로서 사용가능한지를 평가하기 위하여 카드뮴, 구리, 납에 대한 이동성을 평가하였다. 중금속으로 오염된 현장의 조건을 고려하여, 1) 단일 및 혼합상태에 따른, 2) 카드뮴의 경우 초기 농도에 따른 영향을 주상실험을 이용하여 평가하였다. 또한 평형흡착을 가정한 이류-확산 방정식의 해석해를 이용하여 정량적인 평가도 수행하였다. 중금속 종류별로는 단일오염과 복합오염에 상관없이 카드뮴이 구리보다 지연정도가 적게 나타났다. 카드뮴의 지연계수는 혼합인 경우 3.94였고, 구리의 경우 단일에서는 40.3, 혼합에서는 25였다. 카드뮴과 구리의 지연정도의 차이는 전기음성도에 의한 친화력이 다르기 때문으로 판단된다. 전기음성도가 비슷한 구리와 납의 경우 비슷하게 파과가 진행되었지만, 납의 경우 파과가 진행되다가 유출수에서의 농도가 현저하게 줄어 나타난데 반해 구리는 파과진행 후 유출수에서 초기 농도보다 높은 농도가 나타났다. 이는 납이 흡착되어 있던 구리를 탈착시키고 그 공간에 흡착되었기 때문이라고 사료된다. 결국 흡착되어 있던 중금속이 다른 중금속에 의하여 탈착되는 현상이 나타났다. 제강슬래그에서는 중금속이 반응하면서 흐름특성이 변화하는 것으로 나타났다. 카드뮴의 초기농도가 증가함에 따라 지연정도는 감소하여 나타났다.

캐시클래스의 창업체험형 교육 사례 연구: 효과 검증을 위한 인자분석을 중심으로

이광헌(Gwanghun Lee),김규동(Kyudong Kim) 한국창업학회 2018 한국창업학회 Conferences Vol.2018 No.2

본 연구는 기업가 정신을 기초로 한 창업교육에 있어서 활동 지원금을 제공하는 캐시클래스의 지원금 효과에 대한 평가를 진행하였다. 캐시클래스에 참여한 학생 20명을 대상으로 설문조사를 진행하였으며, 활동 지원금을 통하여 팀활동이 실체적인 의미를 가지게 되면서 창업효능감에 긍정적인 영향을 주는 것을 확인할 수 있었다. 단순하게 활동 지원금을 제공한다는 것으로는 의미가 없었다. 그러므로 활동 지원금을 제공하는 캐시클래스와 같은 형태의 실천중심의 교과과 정은 팀 목표를 구체적으로 설정하고, 역할이 명확하게 배분된 활동이 진행될 때 유의미한 영향 을 주는 것을 확인할 수 있었다. This study performed an assessment of the effectiveness of the cash class s funding to provide activity funding for start-up education based on entrepreneurship. The survey of 20 students who participated in the cache class was conducted, and the team activities had a practical meaning through the activity support fund, which had a positive impact on the sense of founding efficiency. There was no point in simply providing an activity grant. Thus, a traction-oriented curriculum, such as a cache class that provides an activity support fund, specifically establishes team goals and has a significant impact on the progress of activities with clear roles.

다축 유압 가진시스템을 이용한 cabin air suspension system평가

이광헌(K. H. Lee),박진성(J. S. Park),문남수(N. S. Moon),이지선(J. S. Lee),정헌술(H. S. Jeong) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.10

Semi-active cabin air suspension system improves driver"s comfort by controlling the damping characteristics of cabin suspension system continuously or discretely in accordance with driving situation. A field test method of evaluating the ride performance of the system has a drawback. It requires a lot of time and money on repetitive test, due to the sensitivity of field test. On the other hand, the test with multi axial hydraulic vibration system can obtain the repeatability of test, better than the field test method. In this paper, the procedures of ride performance test and control logic tuning with the table are presented. Drive files of the table can be represented with the almost same input condition as field test data.

숙명여자대학교 사회혁신 교과운영 사례

이광헌(Gwanghun Lee),김규동(Kyudong Kim),손종서(Jongseo Son) 한국창업학회 2018 한국창업학회 Conferences Vol.2018 No.2

본 연구사례는 사회혁신가 양성을 위한 숙명여자대학교와 SK 행복나눔재단이 공동으로 운영한 교과를 중심으로 2018년도 1학기동안의 활동사항에 대한 주간활동보고서 및 멘토링, 상담 등을 통한 팀별 인터뷰 내용을 정성적으로 분석하였다. 본 교과를 운영한 결과 사회적 기업 및 SK 프로보노를 포함한 실무 관계자를 만나고, 협업 프로젝트를 수행함으로써 다양한 실무 경험을 할 수 있었다는 측면에서는 학생들의 교과 만족도는 높았다. 그러나 협업 프로젝트가 홍보에 국한되어 있었으며, 현업 종사자들과의 협업 과정에서 학생들의 활동에 어려움이 있었다. 학생팀과 사회적 기업을 매칭 하는 과정에서 다양한 방법을 통해 적합한 매칭이 된다면 문제를 해결할 수 있을 것이다. 또한 활동에 있어서 학교, 재단, 멘토와 SK 프로보노, 사회적 기업 관계자와의 관계 설정 등을 보다 명확히 하여야 학생팀의 활동이 보다 실천적이고, 실무경험을 통한 교육효과를 높힐 수 있을 것으로 판단된다. This case was carried out through the weekly activity report, mentoring and consultation on activities during the 1st semester of 2018, focusing on the curriculum jointly operated by the Sookmyung Women s University and the SK Happiness Foundation to train social innovators. As a result of the operation of this course, students were satisfied to have diverse practical experiences by meeting with working-level officials, including social enterprises and SK Provono, and conducting cooperative projects. However, the collaboration project was limited to promotion, and students had difficulties in their activities in the process of collaborating with the field workers. In the process of matching student team to social enterprise, we can solve the problem if there is a suitable match through various methods. In addition, a clearer relationship between the school, foundation, mentor, SK Provono, and social enterprise officials should be established in the activities so that the student team s activities can be more practical and educational effects through practical experience.

중금속 혼합오염물질에 대한 영가철과 슬래그의 반응성 평가

이광헌(Gwanghun Lee),정재식(Jaeshik Chung),남경필(Kyoungphile Nam),박준범(Junboum Park) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10

증산제를 통한 혐기소화율 개선 및 슬러지 감량 활용방안

이광헌(Kawng Hun Lee),김길수(Gil Su Kim),손병권(Beong Keon Sun),최찬섭(Chan Sup Choi),조진우(Gin Woo Cho),신재훈(Jae Hoon Shin),정태영(Tae Young Jeong) 유기성자원학회 2018 유기물자원화 Vol.26 No.3

본 연구는 음식물폐기물로부터 얻어진 증산제 용액을 농축슬러지와 함께 혐기소화조의 투입한 결과 혐기소화율 향상 및 슬러지 감량화를 살펴보았다. 혐기소화조에 증산제를 5%정도 농축슬러지와 함께 투입한 소화조의 메탄생성율이 약 2.7배 정도 높게 발생하였으며, 소화조내 TCOD 농도값이 약 2배 이상 높게 나타난 것은 투입된 농축슬러지의 감량화가 빠르게 진행됨을 알 수 있었다. 또한, 투입된 증산제로 인해 메탄생성효율에 크게 기여함을 간접적으로 알 수 있었다. This study examined the improvement of anaerobic digestion rate and sludge reduction as a result of the addition of anaerobic digestion with thickened sludge and solution of VFAs obtained from food waste. The methane production rate of the digestion system was 2.21 times higher when anaerobic digestion reactor injected into anaerobes with VFAs from food wastes of 5 percent. Also, The reduction of the amount of concentrated sludge injected will proceed rapidly because of the TCOD concentration in the digestion reactor was more than twice higher. Indirectly it was shown that the increased production system contributed significantly to the methane production efficiency.

대학병원 응급실을 내원한 자살 시도자들의 특성

이광헌(Kwanghun Lee),원승희(Seunghee Won),김희철(Hee-Cheol Kim),이종훈(Jong Hun Lee),서완석(Wan Seok Seo),김지우(Jiwoo Kim) 대한생물치료정신의학회 2015 생물치료정신의학 Vol.21 No.2

Objectives:This study aimed to investigate the demographic and psychosocial characteristics and suicide-related clinical variables of suicide attempters and provide empirical data to establish a suicide prevention program. Methods:The subjects were 279(122 male and 157 female) suicide attempters who were admitted to the emergency centers of 4 university hospitals in a large city between June 2011 and March 2014. Their psychosocial and demographic characteristics and suicide-related clinical variables were studied through interviews, questionnaires(on suicide intention, lethality, risk, and rescue) and their electronic medical records. Results:The main findings were as follows : among subjects in their 20s, there was a significantly higher proportion of women, while among subjects older than 60 years, there was a significantly higher proportion of men. The rate of attempting suicide in autumn was significantly higher in females while that in summer was significantly higher in males. The rate of attempting suicide in the morning was significantly higher in older(≥60 years) subjects while that at night and dawn was significantly higher in subjects below 60 years. Among interpersonal relationship problems, couple relationship problems were the most common motive for suicide attempt. Depressive disorders were the most common psychiatric illness. Conclusion:This study indicates the necessity of suicide prevention measures, tailored to several psychosocial factors(place, time-of-day, season, and so on) according to age and gender, are suited to the regional characteristics. It also reveals the necessity of intervention for couple relationship problems and appropriate psychiatric treatment for depression in order to prevent suicide

플라이 애쉬의 오염물질 차단벽체 구성물질로 사용 가능성 평가

이광헌(Gwanghun Lee),명동일(Dong-il Myung),이승학(Seunghak Lee),박준범(Junboum Park) 대한토목학회 2005 대한토목학회 학술대회 Vol.2005 No.10

감쇠력 가변댐퍼를 이용한 반능동 현가장치의 실차실험 특성에 관한 연구

이광헌(K. H. Lee),이춘태(C. T. Lee),정헌술(H. S. Jeong) 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.4

A semi-active suspension is an automotive technology that controls the vertical movement of the vehicle while the car is driving. The system therefore virtually eliminates body roll and pitch variation in many driving situations including cornering, accelerating, and braking. This technology allows car manufacturers to achieve a higher degree of both ride quality and car handling by keeping the tires perpendicular to the road in corners, allowing for much higher levels of grip and control. An onboard computer detects body movement from sensors located throughout the vehicle and, using data calculated by opportune control techniques, controls the action of the suspension. Semi-active systems can change the viscous damping coefficient of the shock absorber, and do not add energy to the suspension system. Though limited in their intervention (for example, the control force can never have different direction than that of the current speed of the suspension), semi-active suspensions are less expensive to design and consume far less energy. In recent time, the research in semi-active suspensions has continued to advance with respect to their capabilities, narrowing the gap between semi-active and fully active suspension systems. In this paper we are studied the characteristics of vehicle movement during the field test with conventional and semi-active suspension system.