구조적 설계문제 최적화를 위한 혼합유전알고리즘

윤영수,이상용 한국경영과학회 1998 한국경영과학회지 Vol.23 No.3

Genetic algorithms(GAs) are suited for solving structural design problems, since they handle the design variables efficiently. This ability of GAs considers them as a good choice for optimization problems. Nevertheless, there are many situations that the conventional genetic algorithms do not perform particularly well, and so various methods of hybridization have been proposed. Thus, this paper develops a hybrid genetic algorithm(HGA) to incorporate a local convergence method and precision search method around optimum in the genetic algorithms. In case study, it is showed that HGA is able consistently to provide efficient, fine quality solutions and provide a significant capability for solving structural design problems.

Restoration Project of Heumgyeonggak-nu (欽敬閣漏) in the King Sejong Era

Sang Hyuk Kim,Yong-Hyun Yun2,Byeong-Hee Mihn,Seon Young Ham,Kyung Ha Lee,Dae-Sik Yoon,Go-Eun Choi,Ho-Chul Ki,Myung-Kyoon Yoon 한국천문학회 2017 天文學會報 Vol.42 No.2

분단시를 통해서 본 민족 동질성 회복 문제

윤상기 대불대학교 1999 論文集 Vol.5 No.1

It is evident that the gap between the literary works of the South and the North is widening. The literature of the North has been growing based on the principles of the communist party. the class system and the people. On the contrary, the literature of the South has been oriented towards artistically prejudiced the art-for-art in the diversifying liberalism. And the difference has made the heterogeneity existed between the literature of the two more conspicuous. It has been anknowledged that the so-called popular literature of the South, which has pursued free democracy and capitalism since the 1970 and the proletarian literature of the North, which has pursed realism, have been heading towards different directions with different objectives. However, there can be found a common similarity between the two in that both of them emphasize the national identity to overcome the psychlolgical barrier caused by the division of the Korean Peninsula.

Au를 공침한 SnO₂후막센서의 가스 감응 특성

성정훈,강대원,이윤수,임준우,홍영호,이덕동 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

High selective and sensitive thick film type methane gas sensors were fabricated and their sensing characteristics for various hydrocarbon gases were investigated. Raw material, SnO_(2)/Au, prepared by coprecipitation was even grain size. SEM, TEM, BET and XRD analyses were carried out for investigation of surface morphology and crystalline structure. The thick film devices using the above materials exhibited high sensitivity to methane gas at the operating temperature of 400°C. The sensitivity of SnO_(2)/Au+Pd thick film devices to methane gas was higher than that to the other hydrocarbon gases such as iso-butane and propane. The optimal adding amounts of Au and Pd were 1wt.% and 3wt.%, respectively. The sensitivity, S, is defined as {(R_(A)-R_(G))/R_(A)}><100, which R_(A) and R_(G) are resistance in air and that in the gas ambient, respectively.

외상성 부정 교합의 교정에 관한 연구

윤성호,김동일 인제대학교 1997 仁濟醫學 Vol.18 No.2

외상성 부정 교합의 교정에 있어서 다양한 수술술식을 이용하여 적절한 교합개선과 하안면부의 심미적 개선의 효과를 얻을 수 있었다. The character of modern society's trauma is a large probability of multiple and severe trauma, specially, the fetal damage accompanied by facial bone fracture. We observed the malocclusion owing to delayed prompt treatment. If the fractured fragments is crushed severely, it is being difficult to make them positioned into the normal anatomical states, to fix them tightly. Post-traumatic malocclusion are usually caused by delayed treatment and inadequate anatomic reduction. Inadequately treated facial bone fractures result in facial disfiguring and functional impairment of mastication and speech. We performed 27cases of the correction of post-traumatic malocclusion between April 1994 and June 1996. We used various operative techniques such as anterior segmental osteotomy, Le Fort osteotomy, Maxillary segmental osteotomy and mandibular sagittal split osteotomy. If the malocclusion was due to disarrangement of teeth toward the appropriately arranged skeletal base, we usually take the method of alveolar segmental osteotomy. If that malocclusion came from not acceptable skeletal bone, we take maxillary segmental osteotomy or mandibular sagittal split osteotomy. We acquired the desirable occlusion at first then, and make the fixation between mandible and maxillary skeletal bones with the bite block. The aim of the correction of malocclusion was to creat a harmony of centric relation and centric occlusion. After operation, intermaxillary fixation with bite block have many advantages of treatment in malocclusion.

중·고등학교 체육 교과서의 활용성

윤해철,조성호 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.20 No.1

The purpose of this study is to investigate whether the text book is used effectively in the practical physical education and, if not, to reveal the reason and find the direction and remedy to reform the school physical education curriculum. The subjects of this survey were 182 of teachers and 1,671 of students and the results were analyzed by using SAS package program. The main results obtained can be summarized as following: First, although students are interested in the class of physical education, there is no variety in the class of both theory and practice. Second, the text book is unsystematically used in the class of the physical education theory. Although students recognized the text book to be used in the class, the contents of the text book did not satisfy students. From the result of this study, we can find that teachers and students relatively want to use the text book in the class of physical education. However, there are many problems in the contents and the practicability of the text book is very low.

오옥신의 종류 및 농도가 가이즈까 향나무의 삽목 발근에 미치는 영향

윤재길,송시호,박상현 진주산업대학교 농업기술연구소 2001 農業技術硏究所報 Vol.14 No.-

Effects of auxin and Rootone on the rooting of Juniperus chinensis var. Kaizuka cutting were investigated to improve propagation efficiency. When Rootone treated, rooting was 100% compared with the control, 33%. IBA 200ppm 1h and NAA 100ppm 12h improved evidently rooting, 93% and 90%, respectively. Root fresh weight increased up to 131mg by Rootone. NAA 200ppm 12h, NAA 500ppm 1h, and IBA 200ppm 1h were also very effective to root fresh weight more than 110mg. Shoot growth(height, fresh weight and dry weight) did not increase largely, but increased a little. Dipping into high concentration auxin solution for 1min increased rooting rate and root fresh weight, but was less effective than low concentration treatment. Shoot growth did not increase largely, but increased a little. These results indicate that Rootone and IBA 200ppm 1h are most effective for improvement of rooting in Juniperus chinensis var. Kaizuka cutting.

오존 감수성 및 저항성 고추 품종의 생리생태 변화

윤성철 한국환경농학회 2004 한국환경농학회지 Vol.23 No.3

공시된 세 품종의 고추에 대한 단기간의 오존 처리로 잎에서 나타나는 전형적인 증상은 갈색의 괴사 반응이었으며, 괴사가 심했던 오존 감수성인 다보탑과 같은 농도에서 괴사가 전혀 없었던 부촌 품종을 오존 저항성 품종으로 판단되었다. 고추의 두 품종에서 오존 처리에 의해 광합성 및 기공 전도도 등의 생리생태적 저해가 뚜렷이 나타났다. 그러나 잎에서 가시피해 정도와 생리생태적 저해 정도와의 상호 연관성으로 고추에서의 오존 저항성 기작을 설명하고자 하였으나 생리생태적 반응으로 잎에서 발생하는 오존 저항성의 기작을 설명할 수 없었다. 다만, 고추에서 오존 처리에 의한 광합성 감소는 뚜렷한 기공전도도 감소와 명반응에서 광합성 기구들의 손상에 기인한다고 여겨진다. 그러나, 암반응에서 생화학적 반응을 설명할 수 있는 A-Ci curve 상에서는 오존 처리에 따른 효과를 찾을 수 없었다. Ozone effects were studied by plant growth chamber to evaluate the impact of ozone (O₃) on the physiology of two hot pepper, Capsicum annuum L., cultivars, 'Dabotab' and 'Buchon'. Forty-day old plants with 5~7 leaves were exposed to O₃ of <20 and 150 nL/L for 8 h/d for 3 days. Net photosynthesis and stomatal conductance were measured and foliar injury was described. Foliar damage due to the treated O₃ was different from the varieties.'Dabotab' was most sensitive to O₃ and 'Buchon' was resistant. Symptom of ozone damage on the leaves was bifacial necrosis. Decreases of net photosynthesis by O₃ were 56% and 40% on 'Dabotab' and 'Buchon', respectively. Decreases of stomatal conductance by O₃ were 66% and 63% on each variety. O₃ damage on net photosynthesis was started at the low levels of light on the two hot peppers. In addition, assimilation-internal CO₂ concentration curves were not different from the two varieties. In conclusion, O₃ closed the stomata and decrease net photosynthesis on hot peppers regardless of the ozone sensitivity on leaf injury, but the difference of ecophysiological responses between the two varieties was not found clearly.

세라믹 정밀여과막 생물반응기를 이용한 매립지 침출수 처리

윤영재,노성희,김선일 한국공업화학회 2003 응용화학 Vol.7 No.2

The results that the membrane bioreactor allows the treatment of ammonia and part of the COD, with a limited production of sludges. The elimination yields observed on the membrane bioreactor are high, starting from a biologicaly equilibrated efflent, since the ratio C/N/P is slightly deficient in P. The Chemical Oxygen Demand and Total Organic Carbon are climinated more than 70%. The Nitrification rate nears 98% despite the important variability of the ammonia concentrations inside the raw leachate. The Suspended Solids are eliminated 100% thanks to the microfiltration membrane.

주택임대차분쟁조정위원회의 도입과 운영방안 연구

尹惠楨,張成洙 서울大學校 環境大學院 2001 環境論叢 Vol.39 No.-