라돈 저감제를 이용한 건축자재의 라돈 방출 저감 연구

박경북,이상혁,Park, Kyung-Buk,Lee, Sang-Houck 한국환경보건학회 2014 한국환경보건학회지 Vol.40 No.6

Objectives: A radon emission reducing agent was prepared using charcoal and zeolite, and the amount was measured after coating construction materials with the agent. The availability of the radon emission reducing agent was evaluated. Methods: Construction materials (red brick, cement brick, and gypsum board) coated with reducing agent were placed in a chamber to measure radon emissions. The construction materials were coated one through three times. The spread volume for brick and gypsum board was 50 mL and 75 mL per application, respectively. The amount of radon emitted was measured by RAD-7 after 48 hours. Results: The reduction ratio increased with the number of coatings, and the reduction ratios for red brick, cement brick, and gypsum board were 63.3, 73.6, and 58%, respectively, in the case of three coatings of RA-1. The reduction ratios for red brick, cement brick, and gypsum board were 42.8, 58.1, and 26.2%, respectively in the case of three coatings with RA-2. RA-1 was slightly better than RA-2 in radon emission reduction. Conclusions: Radon emissions from construction materials decreased according to the concentration of reducing agent coating, and it was more effective than existing methods.

고농도 질산성 질소를 함유한 산세폐수의 생물학적 처리에 관한 연구

박상진 ( Sang Jin Park ),이상혁 ( Sang Houck Lee ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.3

The purpose of this study is the efficient biological treatment of highly concentrated nitrate nitrogen by calcium ion control present within the pickling wastewater. In laboratory scale’s experiments research was performed using a sequencing batch reactor and the evaluation of denitrification reaction in accordance with the injection condition of calcium ions, the surface properties of microorganisms, and the evaluation of sludge precipitability were performed. Results of the study showed that the denitrification reaction was delayed when injecting more than 600 mg/L of the calcium ion within the denitrification process. In addition, we observed the absorption form of calcium ions absorbed on the surface of microorganisms following an increase in the calcium ion dose. It was found that as the calcium ion dose increased the sludge precipitability also increased continuously and it is judged that a smooth denitrification induction is possible when treating the nitrate nitrogen by the calcium ion control of pickling waste water and the shortening of precipitation time enables a liquid operation to increase the reaction time.

대중음악 흥행결정요인이 국내대중음악 흥행성과에 미치는 영향 : 기획사와 유통사의 조절효과를 중심으로

김양석,이상혁,Kim, Yang Sug,Lee, Sang Houck 한국벤처창업학회 2015 벤처창업연구 Vol.10 No.1

K-Pop이 사회, 문화 그리고 경제적인 분야에서 긍정적인 요소로 작용하고 있음에도 불구하고, 국내에서는 관련 연구가 아직 활발히 진행되고 있지 않다. 이에 본 연구에서는 대중음악의 흥행결정요인들이 국내대중음악의 흥행성과에 미치는 영향을 규명하고자 하였다. 기존의 선행연구를 바탕으로 대중음악 흥행결정요인을 파악한 후 가수의 역량, 미디어 영향, OST 영향, SNS 영향 그리고 발매 첫 주 순위를 독립변수로 정하였다. 더불어 2013년 7월 둘째 주부터 2014년 7월 첫째 주까지 가온차트 내 디지털차트 순위에 진입한 국내대중음악을 선별하여 100위 순위 내 유지한 기간을 곡 별로 조사한 후 이를 주 단위로 측정하고 흥행성과인 종속변수로 정하였다. 기획사와 유통사의 역량울 조절변수로 설정한 후 국내대중음악의 흥행결정요인과 흥행성과와의 영향관계에 있어서 조절작용을 하는가를 연구가설로 설정하였다. 연구 결과, 가수의 역량, 미디어의 영향과 SNS의 영향 그리고 발매 첫 주 순위 등이 국내대중음악의 흥행성과에 정(+)의 영향을 미치는 변수로 분석되었으나 OST의 영향은 가온차트 내 디지털차트의 순위유지기간에 유의미한 영향을 미치지 못하는 것으로 분석되었다. 기획사의 역량은 자체적으로는 국내대중음악의 흥행성과에 부(-)의 영향을 미치는 것으로 나타났지만, 조절변수로 작용을 할 경우, 대중음악 흥행결정요인과 국내대중음악 흥행성과에 크게 영향을 미치는 것으로 나타났다. 유통사의 역량은 조절변수로 작용을 할 경우, 대중음악 흥행 결정요인과 국내대중음악 흥행성과에 정(+) 영향을 미치는 것으로 나타났다. The purpose of this study is to find the factors of the box office record in Korean popular music. For this purpose, 1.239 musics were selected in the Gaon digital weekly album chart from second week July 2013 to first week July 2014. The result can be summarized as follows: First, entertainment of music company, distribution of music company, singer, OST(Original Sound Track), television show, SNS and high ranking in the first week of its release are the factors of the box office record in Korean popular music. Second, entertainment of a large number of music production company is more effective than the others, but there is no difference in the case of distribution music company. Third, musics of singers who have large number of music ranked Gaon digital chart and appearance of television show program are effective in the box office record in Korean popular music. Fourth, SNS are great factors to promote Korean popular music. Fifth, it is important to rank high position in the first week of its release.

방재 연구개발 분야의 정부 부처간 역할 조정에 관한 연구

박정한,최규현,김영수,정성훈,이상혁,이평구,이완규,Park, Jung-Han,Choi, Gyu-Hyun,Kim, Young-Soo,Jung, Seong-Hoon,Lee, Sang-Houck,Lee, Pyeong-Koo,Lee, Woan-Kyu 대한자원환경지질학회 2008 자원환경지질 Vol.41 No.3

방재분야에서 가장 발달된 장비와 과학기술을 이용하여 많은 연구개발이 이루어져서 재산 피해를 줄이고 인명을 구하고 있다. 비록 정부가 방재 분야를 확대하려고 노력해 왔지만, 그 투자 규모와 연구 결과는 국내의 타 과학기술 분야나 선진국의 방재분야에 비해 낮은 수준에 머물러 있다. 그렇지만 재난을 방지하는 국가부처인 소방방재청이 2004년 6월에 설치되어, 여러 가지 재난에 효과적이고 정비된 체계를 갖추게 되었다. 이 연구에서는 정부의 투자비용을 산정하고 방재분야와 관련된 영역을 명확히 규명하였다. 또한 방재에 관한 연구개발에 대하여 정부의 각 부처간에 임무를 분석하여 역할 분담에 대해 논의하였다. 이러한 역할 분담은 정부의 승인 절차를 통하여 공고히 하게 되었다. A number of researches on disaster risk reduction using the most advanced equipments and scientific technologies have been performed to minimize the damage of property and to protect human life. Although the Korean government is trying to enlarge the research area for disaster risk reduction, the investment size and the applicable results in this area have stayed in the lower level comparing to other scientific fields in Korea and the same field in advanced countries. However, the National Emergency Management Agency (NEMA), a government Agency which is responsible for disaster management coordination, was established in June 2004 establishing an efficient and well-organized system to cope with various disasters. In this study, investment size by the government was evaluated and associated areas were also identified. We also analyzed the roles on research and development for disaster risk reduction among different government Ministries were analyzed and role assignment to each Ministry was proposed. The role assignment has been concreted by conducting the process of approval in the government.

생태계보전협력금 제도 활성화를 위한 부과금 개선 방안 연구

김경호 ( Gyung Ho Kim ),이상혁 ( Sang Houck Lee ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2011 한국환경복원기술학회지 Vol.14 No.6

Korea introduced the cooperation charge on conservation of ecosystem for minimizing damage of ecosystem due to development projects and their effects and for preparing resources for natural environment conservation projects. Advanced countries have made efforts by expanding investment in natural environment conservation and restoring projects to promote prevention of global warming and improvement of biological diversity, are establishing nationwide strategies and plans. To examine the reality of projects by returns of the cooperation charge on conservation of ecosystem, microsite projects in schools and public facilities take the largest share while their project budgets are only about 100~300 KRW, relatively small, which might be attributable to budget restrictions in accordance with the calculating method of levying cooperation charge on conservation of ecosystem and problems of project proceeding in the system of returning fund for projects in general. The conclusion which this study suggests on invigoration of cooperation charge on conservation of ecosystem and its operation are as followings. First, although the cooperation charge on conservation of ecosystem has been introduced in 2001, the amount of imposition per unit area remains unchanged. It is desirable to increase the amount into 1,400 KRW/㎡ as of August, 2011 as the price index has been continuously rising for the past 10 years and the upward adjustment of imposition per unit area should be notified by the decree of the Ministry of Environment every January. Second, the ceiling amount of the cooperation charge on conservation of ecosystem should be abolished. Now the ceiling amount is defined as 1 billion KRW but it was found that there was not any ceiling amount specified according to the comparative analysis of similar systems with the Korean environmental improvement fund. The ceiling should be abolished so that medium level businesses are carried out and ecosystem recovering projects in the true sense of the word can be made smoothly. Third, weight should be introduced in calculating amounts in accordance with ecologic and economic values. Harmony between development and environment can be achieved by applying differentiated weights of constant regional coefficient by use zone and ecologic and economic values. Continuous efforts of improving cooperation charge on conservation of ecosystem should be made more than anything else so that projects by returns of cooperation charge on conservation of ecosystem get effectiveness.

硏究論文 : 영산강,섬진강 수계 수변구역 매수토지의 관리 현황 및 개선 방안- 순천시 지역을 중심으로-

변성수 ( Seong Soo Byon ),이상혁 ( Sang Houck Lee ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2012 한국환경복원기술학회지 Vol.15 No.6

This study observes the purchased lands in riparian areas of Suncheon City region and proposes a reasonable management method. For the study, the site surveying and analysis on the neglected purchased lands is executed, then, based on the site analysis result, the appropriate management method for each neglected purchased land is established. Each management method is approached from the ecological restoration perspective. According to site surveying and analysis of the neglected purchased lands, most of the sites were bare and agricultural lands. The reason for this is thought to be as when purchasing a land, the areas with higher nonpoint source pollution are bought preferentially. As for the dominant species coverage, 26% (364,000m2) of the total neglected purchased land area in Sucheon City was covered with the dominated species, and for the exotic species coverage, 17% (232,000m2) of the total neglected purchased land area in Sucheon City was covered with the exotic species. The survey site constituted of five different invasive species such as Japanese Hop (Humulus japonicus), Daisy Fleabane (Erigeron annuus), and Evening Primrose (Oenothera odorata). As for the natural succession on site, about 47% of the area showed poor natural succession process. The reason for this outcome is understood as having a lack of appropriate management for purchased lands. Based on the site surveying and analysis, especially the current management state of the and its location, the research site was categorized into preservation, restoration, and improvement sites. During the establishment of the ecological riparian belt, the comprehensive management for preservation, restoration, and improvement of the purchased lands should be executed.

미소 표면변형 관찰을 통한 가스배관 부재의 항복특성 평가

이윤희(Yun-Hee Lee),백운봉(Un-Bong Baek),정인현(In-Hyeon Cheong),남승훈(Seung-Hoon Nahm),이상혁(Sang-houck Lee) 한국가스학회 2008 한국가스학회지 Vol.12 No.2

가스배관 열화부재의 실시간 역학물성 측정기술로 계장화 압입과 압입흔적 입체측정의 융합이 시도되었다. 압입하중-변위곡선을 계장화 압입시험으로 획득한 후 반사식 레이저 스캔너를 이용하여 압입흔적을 3차원으로 관찰하였다. 압흔 단면프로파일로부터 소성역 크기와 실제 접촉경계를 분석할 수 있었고, 두 값을 이용하여 소재의 항복강도와 경도를 계산하였다. 항복강도는 단축 인장시험에서 얻어진 값과 유사한 경향을 나타내었고, 경도는 재료쌓임 영향으로 압입곡선에서 계산된 값에 비해 20~30% 낮은 값을 나타내었으나 최대 인장강도와 정량적인 관련성이 있음을 확인할 수 있었다. 덧붙여 압입하중 인가부의 형태를 수정하여 압입시험과 동시에 압흔주변 형상변화를 측정하기 위한 시스템도 고안되었다. A combination of the instrumented indentation and 3D morphology measurement has been tried in order to perform a real-time property measurement of degraded materials in gas pipelines; threedimensional indent morphologies were recorded using a reflective laser scanner after a series of insturmented indentations on three metallic specimens. Dimensions of the permanent deformation zone and contact boundary were analyzed from the cross-sectional profile over an remnant indent and used for estimating yield strength and hardness, respectively. Estimated yield strength was comparable with that from uniaxial tensile test and actual hardness implying material pile-up effects was lower than the calculated value from indentation curve by 20~30%. It means that this 3D image analysis can explain the material pile-up effects on the contact properties. Additionally, a combined system of indentation and laser sensor was newly designed by modifying a shape of the indentation loading fixture.

Dyna-CLUE 모델을 이용한 양평,여주 지역의 토지이용 변화 예측 및 평가

이동근 ( Dong Kun Lee ),류대호 ( Dae Ho Ryu ),김호걸 ( Ho Gul Kim ),이상혁 ( Sang Houck Lee ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2011 한국환경복원기술학회지 Vol.14 No.6

Land-use changes have made considerable impacts on humans and nature such as biodiversity and ecosystem services. It is recognized as important elements for land use planning and regional natural resources conservation to identify the major causes of land use changes and to predict a process of changes and effects. This study, by using a spatially explicit Dyna-CLUE model, analyzed correlations between driving factors, quantified location characteristics of different land use types using logistic regression analysis and examined future land use changes and its effects in Yangpyeong and Yeoju region. We expected land use changes based on the three scenarios with different future land demands and simulated future changes for spatial variations of land use for the 20 years. The outcomes shows that larger change was found in agricultural areas than forest areas, based on the change in built-up areas. The changes in forest areas, which were mainly occurred in edge area, were expected to affect a large impact on its ecotone. It was found to be the importance of the management of forest edge and the necessity of the environmentally sound and sustainable development in order to conserve natural resources of the region.

Flow-through column 내에서 산성광산배수로 오염된 지하수의 복원에 관한 연구

오병택 ( Byung Taek Oh ),이진호 ( Jin Ho Lee ),이평구 ( Pyeong Koo Lee ),이상혁 ( Sang Houck Lee ),이재영 ( Jai Young Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2006 한국폐기물자원순환학회지 Vol.23 No.7

추출온도, 추출시간, 음용온도에 따른 커피 향미 특성 변화

김영선(Kim, Yeong Seon),김성진(Kim, Sung Jin),이상혁(Lee, Sang Houck) 한국벤처창업학회 2010 한국벤처창업학회 학술대회 Vol.2010 No.11