Development of In-Situ Soil Gas Monitoring Well for Managing the Bioventing Performance

유찬,Yu, Chan The Korean Society of Agricultural Engineers 2007 한국농공학회논문집 Vol.49 No.1

Bioventing is commonly used for petroleum hydrocarbon (PHC) spills. This process provides better subsurface oxygenation, thus stimulating degradation by indigenous microorganisms. Therefore soil vapor monitoring points (VMPs) are extremely important in determining the potential effectiveness of bioventing and in long-term monitoring of bioventing progress. In this study in-situ soil gas monitoring well (GMW) was developed and presented the pilot test results which recover the contaminated site by bioventing method. The result of application was successful and it was expected that GMW developed could be applied to the evaluation procedure of bioventing effectiveness and long-term remediation potential.

산업폐자원을 이용한 환경복원모델 개발

유찬 경상대학교 농업생명과학연구원 2003 농업생명과학연구 Vol.37 No.2

본 연구에서는 실내실험을 통하여 매립장이나 매립지 등의 복토재로서 산업폐기물의 재활용성을 연구하였다. 실험에서는 고로슬래그, 제강슬래그, 화력발전소의 플라이애쉬(비회)와 저희, 인산석고에 대해서 기존의 연구결과들을 참고하고 실험을 수행하였으며, 폐기물들의 물리적, 화학적 그리고 역학적 성질에 대해서 확인하였다. 실험결과에 의해서 저회, 제강슬래그 그리고 인산석고를 복토재료로 선정하였으며, 이를 이용한 모델 실험을 실시하였다. 모델 실험은 약 2개월 동안 수행되었으며, 식물의 성장, 화학적성질의 변화 등의 현상을 관찰하였다. 실험결과로부터 산업폐기물은 역학적으로 성토재로서 우수한 성질을 가지며, 또한 식물의 성장을 위해서도 적절한 수리학적 성질을 가지고 있기 때문에 복토재로서 적용이 가능할 것으로 예상되었다. Laboratory experiments were carried out to investigate the characteristics of industrial wastes(blast furnace slag, steel refining slag, fly ash & bottom ash from an electric power station, phospho-gypsum) with the review from other results for the recycling of wastes in the covering of landfill or reclaimed sites. In the experiments, various physical, chemical, and mechanical properties of industrial wastes were verified and, as the results, bottom ash, steel refining slag, and phospho-gypsum that could be used for the covering material were selected. Using these materials, model test had been performed during about two months and observed some phenomena such that the growth of plants, the variation of chemical properties. As a result of experiments, it was expected that industrial wastes could be adapted for the covering material because it have excellent mechanical properties as a fill material and also have appropriate hydraulic properties for the growth of plants.

개 원발성 면역매개성 혈소판 감소증 증례

유찬,임수정,이선희,박형진,김태신,송은식,김덕환,송근호 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2009 動物醫科學硏究誌 Vol.16 No.1

A 13-year-old, castrated male, Maltese-dog was admitted to the Veterinary Medical Teaching Hospital of Chungnam National University with the history fo petechiae. On physical examination, she had petechiae and ecchymoses at her back, bilateral inguinal region, and inner part of ear pinna. CBC indicated neutrophilia and severe thrombocytopenia. A few platelets, no autoagglutination of RBC, and no spherocyte were observed. Coagulation profile demonstrated normal PT, and aPTT. No significant findings was not found on serum biochemical profile and electolytes test. FNA of a splenic mass which was found on the abdominal radiograph and sonograph demonstrated extramedullary hematopoiesis, Proteinuria was observed on urinarysis. Primary immune-mediated thrombocytopenia was diagnosed by ruling out of other underlying disease, severe thrombocytopenia, and response to immunosuppressive therapy. Prednisone and antibiotics were administered orally and parenterally, respectively. After altering prednisone to azathioprine, the number of platelets was recovered to normal range and petechiae and ecchymoses were improved.

공극수 오염이 시멘트 고화처리된 사질토에 미치는 영향

유찬 한국농공학회 2003 한국농공학회논문집 Vol.45 No.6

Laboratory experiments were carried out to investigate the influence of pore water contamination on the treatment effect of sandy soil which was solidified by Portland cement. In the experiments, setting time of hydraulic cement that was mixed with contaminated mixing water was measured using Vicat equipment and observed the tendency of setting process with the kind of contaminants, organic or inorganic components. It was shown that organic contaminants of the mixing water affect largely on the initial setting process of hydraulic cement and inorganics, expecially heavy metals, did not affect on the initial setting process, otherwise it was appeared that setting time of the sandy soil that was contaminated with inorganic components was apparently faster than the sandy soil that did not include inorganic components even though organic concentrations was relatively low level (COD=200∼300) in the mixing water. The results of unconfined compression strength test (UCST) were well consistent with the results of Vicat equipment test.

지하 환경 오염원 확산 방지공법의 적용사례

유찬,한우선,김승렬,정덕교,한만복 한국지반공학회 2002 지반 : 한국지반공학회지 Vol.18 No.9

개에서 발생한 편충 감염 증례

유찬,이선희,박배근 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2009 動物醫科學硏究誌 Vol.16 No.1

A 4-year-old, intact male, Jindo-dog was admitted to the Veterinary Medical Teaching Hospital of Chungnam National University with the history of diarrhea several times a day the onest of which was a month ago and weight loss. She was not prevented against intestinal parasites and heartmorm since 1 year ago. On physical examination, she was emaciated and had abdominal tension. A Giardia kit test indicated negative result. Results from a serum biochemical profile and electrolytes demonstrated mild reduction in phosphate and sodium. Microfilaria was detected on direct blood smear. A Heartworm kit test indicated positive result. Thoracic radiographs revealed dilation of pulmonary vessels, increased opacity of caudal lung field, and reversed D sign. Abdominal radiographs revealed loss of abdominal serosal details. A abdominal ultrasonograph showed the following: dilation of the intestinal lumen, hyperechoic linear material with acoustic shadowing in bowel, and enlarged lymph node. Fecal examination using saturated saline flotation method indicated that she had trichuris vulpis infection. Anthelmintics were administered orally, and antibiotics were administered parenterally. In addition, heatworm treatment was advised. She had no significant clinical signs such as diarrhea after ten days and five months.

사질토 간극수의 이온 성분들에 따른 전기비저항값의 변화

유찬,윤춘경,이영남,이용길,Yu, Chan,Yoon, Chun-Gyeong,Lee, Young-Nam,Lee, Yong-Gil 한국지반공학회 1999 한국지반공학회논문집 Vol.15 No.1

실내실험에 의하여 사질토 간극수의 이온 성분들사이 관계를 규명하기 위하여 흙의 비저항측정 상자와 STING-Rl비저항 측정기를 이용하여 분석을 수행하였다. 실험은 이온성분들의 농도를 변화시키면서 실시하였다. 또한 2~3가지 성분을 혼합한 경우에 대해서도 비저항값의 변화를 측정하였다. 실험결과는 성분중에서 비소(As)의 비저항값의 감소가 가장 컸으며, 나머지 성분들은 일반성분들과 큰 차이를 보이지는 않았다. 또한 혼합성분의 경우에는 비저항값의 범위가 간극수에 포함된 성분들의 비저항값에 따라 달라지는 것으로 나타났다. A laboratory experiment was performed to examine the relationship between resistivity and ionic components in the pore water of a sand by using soil resistivity test box and STING-Rl. The resistivity measurement was performed with the concentration changes of ionic components. Also, the resistivity change was evaluated for multiple components. The results showed that the resistivity of Arsenic was less than other heavy metals. In the case of complex components, resistivity ranges depended on the resistivity of components existed in the pore water.

흙의 입도분포와 플랙탈 차원

유찬,안성율,이창노,Yu, Chan,Ahn, Sung-Yul,Lee, Chang-No,Baveye, Philippe C. 한국지반공학회 2002 한국지반공학회논문집 Vol.18 No.6

전통적인 흙의 입도분포 곡선상에서 흙의 구성 성분에 따른 프랙탈 차원의 변화에 대해서 Wu등(1993)과Bittelli 등(1999)의 연구결과를 중심으로 Buchan 등(1993)의 실험결과를 이용하여 고찰하였다. 자료분석시에는 실트와 모래의 경계값의 변화에 따른 프랙탈 차원의 변화를 알아보기 위하여 20$\mu{m}$, 63$\mu{m}$ 그리고 125$\mu{m}$에 대한 프랙탈 차원을 산정하여 전체 범위에서 구한 프랙탈 차원과 비교하였다. 분석결과에서는 전통적인 입도분포곡선상에서 프랙탈 차원의 산정은 가능한 것으로 나타났으며, 실트와 모래성분의 경계값은 Wu 등(1993)이 제시한 것 보다 Bittelli 등(1999)이 제시한 경계값이 더 적절함을 알 수 있었다. 또한 Bittelli 등(1999)이 제시한 실험식을 이용해서 실트영역의 프랙탈 차원을 비교적 정확하게 산정할 수 있었다. The fractal dimension that was evaluated with soil components from the traditional particle-size distribution(PSD) curve was analyzed using the results of Wu et al.(1993) and Bittelli et al.(1999). In order to find the change of the variation of fractal dimension with the upper and lower limit, three limit values(200$\mu{m}$, 63$\mu{m}$, and 125$\mu{m}$) were chosen, and these results of fractal dimension analysis were compared to the result that was evaluated in the whole range of the soils. The results showed that it is possible to evaluate fractal dimension from the traditional PSD curve with the soil contents, and it showed that Bittelli et at.(1999)'s upper and lower limit value was more reasonable than Wu et al.(1993). Equations that were presented by Bittelli et at.(1999) also showed a good agreement with the analytical results in the silt domain.

창의성의 두 얼굴: 급진적 창의성과 점진적 창의성

유찬,방호진 대한경영학회 2024 大韓經營學會誌 Vol.37 No.3

창의성에 대한 질문이 확산되고 있다. 그러나 인공지능은 대규모 정보의 취합에 기반한 누적적 지식의 집합체일뿐 기존의 틀을 뒤흔드는 창의적 사고에까지는 이르지 못하고 있다는 의견이 대부분이다. 그럼에도 불구하고 이러한논의는 결국 인간 고유의 창의성에 대한 고민으로 이어지며, 최근 창의성의 유형을 점진적 창의성과 급진적창의성으로 구분하여 이해하는 연구가 제시되고 있다(Madjar, Greenberg & Chen, 2011). 급진적 창의성은 기존의 틀을 깨는 파격적인 아이디어의 제시 또는 혁신적 행동을 의미하며, 점진적 창의성은기존의 업무 수행 방식에 대한 새로운 아이디어의 추가 또는 개선을 의미한다. 이러한 두 가지 유형의 창의성을구분하여 이해함으로써, 조직 현장에서의 창의성과 조직 유효성간의 관계를 좀 더 입체적 시각으로 바라볼 수 있다. 본 연구는 이러한 두 가지 유형의 창의성이 개인의 직무성과에 서로 다른 방식으로 영향을 줄 것이며, 각각의창의성은 기존의 동기 관련 연구에서 제시되었던 내재적 동기와 외재적 동기에 의해 각각 영향을 받을 것이라는가설을 설정하고 이를 실증 분석으로 검증하였다. 실증 분석을 위해 팀 단위 업무 수행을 하고 있는 국내 기업의구성원 400명을 대상으로 설문조사를 실시하였다. 회수된 322부의 설문결과를 대상으로 구조방정식 모형을 검증한결과, 개인의 내재적 동기는 급진적 창의성과 점진적 창의성에 모두 유의한 영향을 나타내었고, 내재적 동기의효과는 점진적 창의성보다는 급진적 창의성에 더 크게 나타나는 것을 확인하였다. 외재적 동기의 경우 점진적창의성에 유의한 영향을 나타내었고 창의성과 직무성과의 관계에서 점진적 창의성의 효과는 유의하게 나타난 반면, 급진적 창의성은 직무성과에 직접적 영향을 주지 않는 것으로 확인되었다. 동기와 성과의 관계에서 내재적 동기가점진적 창의성의 매개효과를 통해 직무성과에 유의한 영향을 주는 것으로 확인되었다. 이러한 실증분석 결과를토대로 본 연구의 이론적 시사점, 실무적 시사점과 향후 연구를 위한 제언을 제시하였다. In today's corporate environment, competition among companies is accelerating, and technology is advancing rapidly. To maintain competitiveness in this dynamic landscape, companies must prioritize constant innovation to secure future advantages and effectively navigate changes. Creativity has emerged as a critical factor in business management, enabling organizations to adapt to the evolving business environment and gain a competitive edge. The discussion ultimately leads to contemplation on human innate creativity, and recent studies have proposed understanding creativity in terms of two types: incremental creativity and radical creativity(Madjar et al., 2011). Radical creativity refers to the presentation of revolutionary ideas that break existing frameworks or innovative actions, while incremental creativity involves adding or improving upon existing methods of task performance. By distinguishing between these two types of creativity, a more comprehensive perspective on the relationship between creativity in organizational settings and organizational effectiveness can be obtained. This study hypothesized that these two types of creativity would influence individual job performance in different ways and that each type of creativity would be influenced by intrinsic and extrinsic motivation, as suggested in previous motivation research. Intrinsic motive is predicted to have a positive influence on both radical creativity and incremental creativity, whereas the extrinsic motive is expected to exert a positive impact only on incremental creativity. To test these hypotheses, a survey was conducted on 400 members of domestic companies engaged in team-based task performance. Structural equation modeling was performed on the collected 322 survey responses. The results revealed that intrinsic motivation significantly influenced both radical and incremental creativity, with a greater effect observed on radical creativity compared to incremental creativity. Extrinsic motivation was found to significantly influence incremental creativity, and the effect of incremental creativity on job performance was significant. In the relationship between motivation and performance, it was supported that intrinsic motivation significantly influences job performance through the mediating effect of incremental creativity. However, radical creativity was found not to directly influence job performance. The lack of statistically significant relationship between radical creativity and job performance has been interpreted in several possible ways. Overall, it is supposed that radical creativity is more characterized by long-term innovation and the introduction of entirely new ideas rather than immediate performance outcomes in the workplace. Based on these empirical findings, theoretical implications, practical implications, and suggestions for future research were presented.

생장 및 부상성이 향상된 남세균 돌연변이 균주 Arthrospira platensis M20CJK3

유찬,김충재,최강국,안치용,최종순,오희목,Yoo, Chan,Kim, Choong-Jae,Choi, Gang-Guk,Ahn, Chi-Yong,Choi, Jong-Soon,Oh, Hee-Mock 한국미생물학회 2009 미생물학회지 Vol.45 No.3

A photosynthetic cyanobacterium Arthrospira platensis, well known for health food supplement, was studied as a target species for atmospheric $CO_2$ removal as well as biomass production. Although the biomass of A. platensis was massively produced in many countries, the recovery cost of its biomass is still high. The purpose of this study was to develop the A. platensis mutant strains which have enhanced growth rate and floatation activity to reduce the recovery cost. A. platensis KCTC AG20590 was treated with 0.24% ethyl methanesulfonate (EMS) for 20 min at room temperature. The mutant strain A. platensis M20CJK3 was finally selected by its morphological and physiological features. The morphology of the mutant A. platensis M20CJK3 was changed from loose-coiled form to tight-coiled form showing short pitch. The growth and $CO_2$ uptake rate of A. platensis M20CJK3 were improved about 15% and 17% compared with A. platensis KCTC AG20590, respectively. The floatation activity of A. platensis M20CJK3 was enhanced in 2-fold compared with that of A. platensis KCTC AG20590. Soluble proteins extracted from two strains were analyzed by two dimensional electrophoresis (2-DE) and MALDI-TOF MS/MS. Among 15 protein spots induced in 2-DE analysis, two spots were the proteins related to photosynthesis and electron transfer system of the other cyanobacteria. As a consequence, it seems that the tight-coiled mutant A. platensis M20CJK3 has an advantage of high growth rate and floatation activity which are beneficial for the mass cultivation and recovery. 건강보조식품 등으로 이용되는 Arthrospira platensis는 세계적으로 대량생산되고 있으나 생산공정 중 수확단계에서 많은 비용이 소요된다. 본 연구에서는 부상을 이용한 효과적인 수확을 위해 균주의 개량을 시도하였으며, 개량균주의 생리적 물리적 특성을 파악하고자 하였다. Ethyl methanesulfonate (EMS)를 모균주 A. platensis KCTC AG20590에 0.24%의 농도로 10, 20, 30분씩 처리하여, 형태 및 부상성이 우수한 균주 A. platensis M20CJK3 균주를 분리하였다. A. platensis M20CJK3은 느슨한 형태에서 촘촘한 형태로 세포사(trichome)의 길이 및 코일간 간격이 감소하였으며, 생장 및 $CO_2$ 고정능이 각각 15%, 17% 향상되었다. 또한, 개량균주의 부상성은 모균주에 비해 2배 이상 향상되었다. 이차원 전기영동 분석을 통해 모균주와 개량균주의 단백질 발현양상을 비교분석한 결과 광합성 관련 색소의 구조와 광전자전달계에 관련된 단백질의 발현 양상이 차이를 보였다. 본 연구에서 개발된 A. platensis M20CJK3은 고밀도 대량배양 및 수확에 유리하며, A. platensis 유전자 연구의 유용한 모델 균주로 활용될 수 있을 것으로 사료된다.