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교수-학습 지원을 위한 웹 에이전트(web agent)의 개발
강신천,한승록,박정환 한국컴퓨터교육학회 2003 컴퓨터교육학회 논문지 Vol.6 No.1
최근 에이전트를 교육에 활용하려는 연구와 노력이 시도되고 있다. 에이전트는 컴퓨터가 사용자를 대신하여 주어진 일을 수행하는 대행자(proxy)나 중개자(middle ware) 역할을 하는 컴퓨터 프로그램을 통칭하는 개념이다[1]. 근래에 다양한 장르에서 에이전트가 활용되고 있으며 교수·학습분야 역시 그러한 것 중의 하나에 해당된다. 웹 상에서 교사의 역할을 대신할 수 있는 프로그램이나 엔진의 개념이 교수·학습을 지원하는 웹 에이전트이다. 웹 상에서 에이전트는 교사의 역할을 수행할 뿐만 아니라 학습자를 도와 주는 도우미 역할을 수행한다. 웹 에이전트가 적용된 웹 기반 교수·학습 환경은 학습자나 교사에게 적응적이고 개별화된 환경을 제공한다. Recently there are many tries and researches for using web agent in education. The agent is a computer program as a common name which takes a role like a proxy or a middle ware for accomplishing the given something on behalf of user [1]. Lately the agent is being used in the various fields. The teaching and learning Is the one of those. It is the web agent that support the teaching and learning on the web. It has a concept of the program or the engine is able to do teachers roles on the behalf of him on the web. Not only the web agent is able to do teachers roles on the behalf of him, but also it is a helper that helps learners on the web. The web based teaching and learning environment has the web agent offers the personal and the adaptive information, interface, or contents.
Aspergillus sp. ISR 균주를 통한 콜레스테롤 합성저해제 lovastain의 생산
박상은,조미현,신동화,황승환,박천석 경희대학교식량자원개발연구소 2005 硏究論文集 Vol.24 No.-
본 연구에서 한국 토양에서 분리된 lovastatin 생산 균주인 Aspergillus sp. ISR 균주를 이용하여 여러 배지 조성 성분이 lovastatin의 생산에 미치는 영향을 관찰하였다. 탄소원으로는 lactose보다 glycerol 5%가 가장 효과적이었으며 질소원과 인산염의 경우는 기본 RPM배지 조성과 농도에서 보다 효과적인 것을 발견하지 못하였다. 복합영양원으로 rapeseed meal 보다는 대두박이 보다 효과적이어서 저렴한 배지원으로 사용이 가능할 것으로 사료된다. 최종적으로 최적화된 배지를 사용하여 52 mg·L^(-1)의 lovastatin을 생산할 수 있었고 이는 기존의 RPM 배지보다 수율이 4.5배 증가한 것이다. 좀 더 효과적인 lovastatin의 생산을 위하여 회분식 발효에 대한 연구와 분자유전학적인 연구를 통한 고생산 균주의 제조에 대한 연구가 진행중이다. Effects of various nutritional components on the production of lovastatin were investigated in the Aspergillus sp. ISR. Among various carbon (C) sources, glycerol was determined to be the most effective C source at the concentration of 5% (v/v). In case of nitrogen sources, 0.2% (w/v) KNO_(3) efficiently induced the lovastatin production in Aspergillus sp. ISR. Interestingly, the addition of soybean meal into the production medium enhanced the lovastatin production compared to the rapeseed meal. Conclusively, Aspergillus sp. ISR produced 52 mg·L^(-1) of lovastatin in the optimized medium containing 5% (v/v) glycerol, 0.2% (w/v) KNO_(3), 0.3% (w/v) KH_(2)PO_(4), and 0.3% (w/v) soybean meal, which was 4.5 times higher than the amount produced using the standard RPM (rapeseedmeal production medium).
유한 단층 모델 및 순환 경계조건을 이용한 전지구 지진해일 예측 시스템 개발
이준환(Jun-Whan Lee),박은희(Eun Hee Park),박순천(Sun-Cheon Park),우승범(Seung-Buhm Woo) 한국해안해양공학회 2015 한국해안해양공학회 논문집 Vol.27 No.6
본 연구에서는 원거리 지진해일에 대응하기 위한 기초 연구로써 유한 단층 모델과 순환 경계조건을 이용한 전지구 지진해일 예측 시스템을 제안하였다. 제안한 전지구 지진해일 예측 시스템을 2014년 칠레 지진해일에 적용하여 원거리 지진해일에 대한 대응 시스템으로써의 가능성을 검토하였다. 전지구 지진해일 예측 시스템의 경계조건, 지배방정식, 격자 크기, 단층 모델에 따른 지진해일 파고와 도달시각을 DART 부이, 조위관측소 관측 자료와 비교함으로써 유한 단층 모델과 순환 경계조건의 중요성을 확인하였다. A global tsunami prediction system was suggested for a distant tsunami using a finite fault model and a cyclic boundary condition. The possibility of the suggested system as a distant tsunami response system was checked by applying it into the case of 2014 Chile tsunami. A comparison between the numerical results(tsunami height and arrival time) with different conditions (boundary condition, governing equation, grid size and fault model) and measured data (DART buoy, tide station) showed the importance of the finite fault model and the cyclic boundary condition.
Cimetidine 및 16 , 16 - dimethyl prostaglandin E2 가 흰쥐 위액분비 및 위궤양형성에 미치는 영향
이기환(Ki Whan Lee),김종숙(Chong Sook Kim),박실무(Sil Moo Park),박병국(Byung Goog Park),차광수(Kwang Soo Cha),서승천(Seung Cheon Seo),엄석준(Souk Jun Um) 대한소화기학회 1982 대한소화기학회지 Vol.14 No.2
N/A the effect of prostaglandin E2 and cimetidine on acute gastric mucosal lesions produced by topical aspirin(200 mg/kg) plus HCI(150 mM) in the pylorus ligated rats were studied. 16, 16-dimethyl prcstaglandin E2 and cimetidine significantly reduced gastric juice secreticn, pH and acid output. A 1so 16, 16-dimethyl prostaglandin E2 and cimetidine significantly reduced acute gastric muicosal lesion although acid was given exogenously so as to negate any antisecretory effect of the drugs studied. We conclude that both 16, 16-dimethyl prostaglandin E2 and cimetidine reduced gastric juice secretion, pH, and acid output and also protect gastric mucosal lesion by some means other than their effect on acid output.
편마비 환자의 계단과 경사로 오르기 동안 하지의 근 활성도 분석
박승규,천동환,Park, Seung-Kyu,Cheon, Dong-Whan 대한물리치료학회 2012 대한물리치료학회지 Vol.24 No.4
Purpose: The purpose of this study was to investigate the change of muscle activities during level walking, stairs and ramp climbing in hemiplegic patients. Methods: Eight hemiplegic patients were recruited and agreed to participate in this study. Muscle activity was measured by MP100 system (BIOPAC System Inc., Santa Barbara, CA, USA). Statistical analysis was used as a one-way repeated measure of ANOVA to know the difference according to the gait conditions (level walking, stairs and ramp ascending). Results: In the swing phase, muscle activity of rectus femoris muscle, with the side lower extremities affected, were generally significantly different in the stair and ramp ascending. In addition, biceps femoris muscle with unaffected side lower extremity was generally significantly different in the ramp ascending. In the swing phase, muscle activity of tibialis anterior muscle with unaffected side lower extremities was generally showed a significant difference in the ramp ascending. In the stance phase, climbing stairs and ramps showed an increase in the muscle activities. Further, climbing the stairs increased muscle activities of the gastrocnemius muscle. Conclusion: These findings indicate that compared with the level walking climbing stairs, ramps and muscle activities of lower extremity during each showed different results. It can be seen that in accordance with the terms of gait are different muscles group recruitment.
저빌동물허혈모델에서의 1시간 중등도 저체온의 신경조직학적효과
김인병,정경천,임성빈,장석준,김승환 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.3
Background : In animal models of cerebral ischemic-reperfusion has been shown to have a beneficial effect. The object of this study is to compare the effect of pathologic findings between normothermic and moderate hypothermic group. Methods : We investigated the effect of moderate hypothermia induced 1 hour after transient(10 min) both carotid artery occlusion on the extent of ischemic-reperfusion cell damage in Mongolian Gerbil model. The terminal deoxyribonucleotidyl transferase(TdT)-mediated biotin-16-dUTP nick-end labelling(TUNEL staning) are used to detect apoptosis. Results : 1. We suggest that Core body temperature is down to moderate hypothermia(30 - 32℃) beyond 10 minite by selective bain cooling method in Mongolian Gerbil model. 2. By light microscopy, ischemic-reperfusion damage were detected in the hippocampal CA1 pyramidal layer on the 3 day after transient ischemic insult, which showed chrosomal condensation and cytoplasmic eosinophilia. Ischemic-reperfusion cells were increased in the CA1 region on the 5 day. Apoptotic cells of the CA1 neurons seen by TUNEL staining than ischemic neurons seen by Hematoxylin-eosin stainig were investigate 3 and 5 days after ischemic-reperfusion insult. Conclusion : We suggest that is not neuroprotective effects of Intraischemic(1hour) moderate hypothermia in Gerbil brain global ischemic-reperfusion model.
개량형 Durometer를 활용한 미장시기별 Dry Mortar의 건조수축 길이변화 특성
한수환 ( Han¸ Soo-hwan ),현승용 ( Hyun¸ Seung-yong ),황인성 ( Hwang¸ Yin-seung ),윤치환 ( Yoon¸ Chi-whan ),한민철 ( Han¸ Min-cheol ),한천구 ( Han¸ Cheon-goo ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
This study is conducted to provide a method to estimate the setting time and early age compressive strength using D type durometer.Test results indicated that the use of D type Durometer attached with modified needle, which was designed to secure improved accuracy in setting and compressive strength, enables to estimate setting time and the compressive strength at early age.
지진해일 시나리오 DB에 기반한 동해안 지진해일 위험 지역 분류
손동효(Sohn Dong Hyo),박순천(Park Sun Cheon),이준환(Lee Jun Whan),문광석(Moon Kwang Seok),김현승(Kim Hyun Seung),이덕기(Lee Duk Kee) 한국방재학회 2018 한국방재학회논문집 Vol.18 No.3
이 연구에서는 개선된 기상청의 지진해일 시나리오 DB에 기반하여 일본 서안 북부지역에서 발생한 지진해일로 인해 피해 가능성이 높은 동해안 지역을 파고에 따라 분류하였다. 시나리오 DB의 정확도 향상을 위해 수치모의시 최신의 수심 및 해안선 자료와 육지정보를 사용하였고, 격자해상도를 높였다. 일본 서안 북부지역에서 발생한 지진해일은 임원부근 지역에서 제일 높은 파고를 형성하고, 경상지역보다 강원지역에 더 높은 파고를 유발하였다. 파고는 지진 규모가 커질수록 높아졌고, 동해안을 따라 남쪽으로 내려갈수록 낮아졌다. 결론적으로 동해 판경계부에서 규모 7.0 이상의 지진이 발생했을 때 주의가 필요하고, 지진해일 발생시 임원부근 해안에 대해서는 중점적인 관측이 필요하다. We classified the areas in the eastern coast of South Korea which are highly likely to be affected by the tsunami that occurred along the northwestern coast of Japan using the improved tsunami scenario database of the Korea Meteorological Administration. To improve the accuracy of database, we used the latest data on bathymetry, coastline, and land information and increased grid resolution for numerical simulation. When tsunami occurred along the northwestern coast of Japan, the maximum wave height appeared in the around Imwon. And the wave height of Gangwon coastal area was higher than those of Gyeongsang. The tsunami height increased as the magnitude of the earthquake increased and decreased as it moved southward along the eastern coast. In conclusion, attention should be paid when an earthquake of magnitude 7.0 or greater occurs in the plate boundary region of the East Sea. And when a tsunami occurs in this region, we need to focus on the area near Imwon.