[논문]감천댐 건설에 따른 기상변화 연구

이화운,정우식,이귀옥,임헌호,백승주 부산대학교 환경문제연구소 2004 環境硏究報 Vol.22 No.-

In order to investigate the variation of meteological factors induced by construction of dam, the prediction model, WQRRS, is used. As a result, the effect of Dam construction showed that the amount of evaporation increases because of broad water surface area. Therefore, nighttime relative humidity is raised, and annual foggy days are increased more than 7days and sunshine hours are decreased.

L-N-Benzylaspartic acid의 선택적 에스테르화 반응

이채호,김일광,박승화,이영행,정봉영 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.1

Selective esterification and synthesis of L-N-benzylaspartic acid from L-aspartic acid are described. L-Aspartic acid was transformed into dibenzyl L-asparate p-toluenesulfonate, which was treated with sodium bicarbonate to afford dibenazyl L-asparate. Formation of Schiff base of dibenayl ester with benzaldehyde and subsequent hydrogenation-dehydrogenation of the Schiff base produced L-N-benaylaspartic acid. L-N-Benaylaspartic adcid was transformed into L-N-benzylaspartic anhydride hydrogen bromide, which was treated with methyl alcohol and benzyl alcohol to afford a-methyl and a-benzyl L-N-benzylaspartate and L-N-benaylaspartic acid was transformed into L-N-benaylaspartic acid copper(Ⅱ) salt, which was treated with N,N,N,N-tetramethylguanidine and benzyl bromide to afford β-benzylaspartate

Estimation of Turfgrass Cover Rate using Image Analysis

( Seung Hwa Yu ),( Sun Wook Back ),( Yong Joo Kim ),( Sun Ok Chung ),( Hyun Min Shin ),( Je Hoon Sung ),( Kyeong Hwan Lee ) 한국농업기계학회 2013 한국농업기계학회 학술발표논문집 Vol.18 No.2

Characterization of Microbial Community in the Leachate Associated with the Decomposition of Entombed Pigs

( Yang Seung Hak ),( Sun Hwa Hong ),( Sung Back Cho ),( Joung Soo Lim ),( Sung Eun Bae ),( Hee Kwon Ahn ),( Eun Young Lee ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.10

Foot and mouth disease (FMD) is one of the acute infectious diseases in hoofed and even-toed mammals, including pigs, and it occurs via acute infection by Aphthovirus. When FMD is suspected, animals around the location of origin are typically slaughtered and buried. Other methods such as rendering, composting, and incineration have not been verified in practice in Korea. After the FMD incident, the regular monitoring of the microbial community is required, as microorganisms greatly modify the characteristics of the ecosystem in which they live. This is the result of their metabolic activities causing chemical changes to take place in the surrounding environment. In this study, we investigated changes in the microbial community during a 24 week period with DNA extracts from leachate, formed by the decomposition of buried pigs at a laboratory test site, using denaturing gradient gel electrophoresis (DGGE) with a genomic DNA. Our results revealed that Bacteroides coprosuis, which is common in pig excreta, and Sporanaerobacter acetigenes, which is a sulfur-reduced microbe, were continuously observed. During the early stages (0~2 weeks) of tissue decomposition, Clostridium cochlearium, Fusobacterium ulcerans, and Fusobacterium sp., which are involved in skin decomposition, were also observed. In addition, various microbes such as Turicibacter sanguinis, Clostridium haemolyticum, Bacteroides propionicifaciens, and Comamonas sp. were seen during the later stages (16~24 weeks). In particular, the number of existing microbial species gradually increased during the early stages, including the exponential phase, decreased during the middle stages, and then increased again during the later stages. Therefore, these results indicate that the decomposition of pigs continues for a long period of time and leachate is created continuously during this process. It is known that leachate can easily flow into the neighboring environment, so a long-term management plan is needed in burial locations for FMD-infected animals.

월악산국립공원 용하구곡의 식생구조 및 관리방안

백승준 ( Seung Jun Back ),강현경 ( Hyun Kyung Kang ),김선화 ( Sun Hwa Kim ) 한국환경생태학회 2013 한국환경생태학회지 Vol.27 No.4

본 연구는 월 악산국립공원 용하계곡을 대상으로 용하구곡시문에 내재되어 있는 식생경관 요소를 도출하고, 현존식생, 식물군집구조를 조사하여 식생구조를 파악, 국립공원 내 구곡경관의 유지 및 개선을 위한 식생 관리방안을 제시하고 자 하였다. 시문을 통하여 자연경관요소를 도출한 결과, 너럭바위, 자연첩석, 맑은 물, 밝은 돌, 시냇물, 골짜기, 폭포, 소나무, 당 단풍으로 나타났으며, 주요 식생경관 요소로서 소나무와 당 단풍으로 도출되었다. 현존식생 조사 결과, 자연식 생은 67.5%로 소나무군집, 굴참나무군집, 굴참나무-소나무군집, 굴참나무-졸 참나무군집, 졸 참나무군집, 신갈나무군집, 신갈나무-소나무군집, 낙엽활엽수군집으로 분류되었다. 인공식생(18.7%)은 졸 참나무-일본잎갈나무군집, 신갈나무-밤 나무군집, 일본잎갈나무군집, 일본잎갈나무-밤나무군집, 관목림, 일본잎갈나무-신갈나무군집이 분류되었으며, 초지지 역(2.0%)은 참 억새군집, 갈대군집, 기타지역(11.9%)은 조경수식재지, 밭, 과수원, 주거지역으로 구분되었다. 용하구곡의 대표식생은 소나무군집, 굴참나무-졸 참나무군집, 일본잎갈나무군집, 낙엽활엽수군집이었으며 Shannon의 종 다양도 는 전체적으로 0.6274∼0.9908이었다. 용하구곡은 도통 계승과 자 연애의 표상이며, 조선말과 일제강점기의 위정척사 사 상이 담겨있는 청정지역으로 자연성이 높은 계곡경관의 보전이 이루어져야 한다. 이와 같은 역사·문화적 구곡의 식생경 관 관리방안을 위하여 소나무군집은 경관유지, 일본잎갈나무군집은 자연천이 유도를 위한 밀도관리가 필요하며, 자연 재해 및 인위적 훼손 시, 계곡 부 식생복원을 위하여 역사·문화적 식생경관인 소나무 중심의 식생복원계획이 적용되어져야 할 것으로 사료되었다. This study was conducted to suggest vegetation management plan for Gugok landscape maintenance and improvement by deducing the vegetation landscape factors inherent in Yongha Gugok and understanding vegetation structure through the investigate of existing vegetation and plant community structure of Yongha valley in Woraksan National Park. There were broad and flat rocks, natural layered stones, clear water, light stones, stream, valleys, waterfalls, Pinus densiflora and Acer pseudosieboldianum as a result of deducing natural factors on poetry. There were P. densiflora and A. pseudosieboldianum appeared as one of main vegetation landscape elements. The actual vegetation analysis results were as followed. The natural vegetation occupied 67.5% and it was classified as P. densiflora community, Quercus variabilis community, Q. variabilis-P. densiflora community, Q. variabilis-Q. serrata community, Q. serrata community, Q. mongolica community, Q. mongolica-P. densiflora community, Deciduous broad-leaved tree community. The artificial vegetation (18.7%) was classified as Q. serrata community-Larix kaempferi community, Q. mongolica- Castanea crenata community, L. kaempferi community, L. kaempferi-C. crenata community, fruticeta, L. kaempferi-Q. mongolica community. The grassland area (2.0%) was classified as Miscanthus sinensis community, Phragmites communis community, and other areas were classified as landscape tree planting area, farm, orchard, residential area. The representative vegetation were P. densiflora community, Q. variabilis-Q. serrata community, L. kaempferi community, Deciduous broad-leaved tree community in Yongha Gugok. The species diversity index of Shannon was 0.6274 0.9908 on the whole. Yongha Gugok, as a symbol of succession on confucianism and reverence for nature, should be preserved natural valley landscape being clean and wijungchuksa at the end of Joseon Dynasty and Japanese Colonial era. In this historical and cultural Gugok, vegetation landscape management plan is needed to landscape maintenance with P. densiflora community, density control with L. kaempferi community. And it is considered when natural disasters and artificial damages happened, P. densiflora-oriented vegetation restoration plan should be applied in order to restore.

실시간성과 신뢰성 향상을 위한 CANopen 메시지 스케줄링 기법 연구

한승신(Han Seung Shin),유화수(Ryu Hwa Soo),이상백(Lee Sang Back),한경식(Han Kyung Sik) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.10

Measurement of Granular Fertilizer Application Rate using Image Analysis

( Sun Wook Back ),( Seung Hwa Yu ),( Yong Joo Kim ),( Sun Ok Chung ),( Hyun Min Shin ),( Je Hoon Sung ),( Kyeong Hwan Lee ) 한국농업기계학회 2013 한국농업기계학회 학술발표논문집 Vol.18 No.2

a-SiOx Buffer Layer 삽입을 통한 고효율 비정질 실리콘 박막태양전지에 관한 및 연구

박승만(Park, Seung-Man),이선화(Lee, Sun-Hwa),공대영(Kong, Dae-Young),이원백(Lee, Wan-Back),정우원(Jung, Wu-Wan),이준신(Yi, Jun-Sin) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11

TCO/p/i/n 구조의 비정질 실리콘 박막 태양전지의 제작에 있어서 TCO계면과 p층사이의 이종접합에서의 큰 밴드갭 차이는 p층으로부터의 정공 재결합을 통하여 효율 저하의 원인이 된다. 이러한 재결합은 넓은 밴드갭을 가진 물질을 완충층으로 삽입함으로써 개선되어 질 수 있다. 본 논문에서는 비정질 실리콘 보다 넓은 광학적 밴드갭을 가지는 a-SiOx 박막을 완충층으로 사용하여 TCO/P 계면에서의 재결합 감소에 대한 시뮬레이션을 수행하였다. a-SiOX 박막 내에 포함된 산소의 양에 따라 밴드갭을 조절하여 1.8eV~2.0eV 사이의 완충층을 삽입하여 박막태양전지의 개방전압, 단락전류, 효율 등에 끼치는 영향을 ASA 시뮬레이션을 통하여 알아보았다.

제 6 차 제 7 차 초등학교 3 , 4 학년 과학 교과서의 내용과 삽화의 비교 , 분석

백남권(Nam Gwon Back),서승조(Seung Jo Seo),조태호(Tae Ho Jo),김성규(Sung Kyu Kim),박강은(Kang Eun Park),이경화(Kyung Hwa Lee) 한국초등과학교육학회 2002 초등과학교육 Vol.21 No.1

The purpose of this study was to examine whether or not they have been revised corresponding to the purpose of revision by making a comparative analysis of the content and illustration in the 6th and 7th primary science textbooks. The analysis of content was composed of knowledge, inquiry process and attitude. The analysis of illustrations was composed of the kinds of illustrations and the role of illustrations. The findings of this research were as follows: First, as a result of content analysis of the primary science textbooks in the 6th and the 7th national curriculum, the ratio of inquiry process showed the highest frequency, next knowledge and lastly scientific attitude. And the 7th textbooks are greatly emphasized knowledge and science attitude. Second, as a results of the illustration analysis are as follows: There are conspicuous differences in that the illustration number of the 7th science textbooks is about twice the illustration number of the 6th science textbooks and next, they place more weights on pictures and comics hard to discovery in the 6th science textbooks. Therefore, they have tried to induce the interests of students and heighten their understanding by supplementing the role of illustration presented as picture-centered and increasing its number presented as picture. In the results, although they have improved the problems of the 6th national curriculum a lot through the innovation including the interest induction of pupils through comics, the development of its content presentation method, the gradual change of subject number and the cultivation of curriculum according to the level of enrichment and supplementing types, the 7th science textbooks have fallen short of 6.3%, not around 30% in terms of the reduction in the 7th national curriculum. Accordingly, the 7th science textbooks also can be pointed out to have the problems of too much amount of studying compared to the time per week like the 6th science textbooks.

Removal of Ammonia from Swine Manure by Mixed Microorganisms

( Lim Joung-soo ),( Sung-back Cho ),( Deug-woo Han ),( Sang-ryong Lee ),( Ok-hwa Hwang ),( Jung-hoon Kwag ),( Modabber Ahmed Khan ),( Yang Seung Hak ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-

This study was conducted to investigate the characteristics and concentrations of ammonia produced from the livestock swine manure treated with mixed microorganisms. Odor generating device was made by volume of about 1.12 L for sampling ammonia odor. When swine manure was placed in reactor, average concentration of ammonia was about 310 ppmv out of the range from 295 ppmv to 340 ppmv. Removal efficiencies showed 48% to 73% after 24 hr as compared to initial level before spraying. The persistence of efficiency in two treatments (2 and 5) were 66.7% and 55.9%, respectively that retained for the first seven days. Among the mixed microorganisms, the treatment 2 (mixed microorganisms) showed the best efficiency of 63.3% to 86.7%. To evaluate the effects of 5 kinds of spray mixed microorganisms, the experiments were conducted and based spray treatments without spray mixed microorganisms on swine manure. Swine manure were subjected to a 7-day reactors in which the effects of the spray mixed microorganisms on the ammonia emission were compared. The ammonia gas emission was measured for every day. Ammonia emission from the swine manure with the spray mixed microorganisms was lower than that of the manure in the control treatment (without spray mixed microorganisms). In ammonia removal efficiencies of the experimental groups, some mixed microorganisms showed from 55.9% to 86.7% removal efficiencies throughout the entire period as compared to the control group. On the other hand, initial reduction of ammonia in some treatments (mixed microorganisms) was effective temporarily.