漢江下流部 水害輕減을 爲한 調査 硏究

金漢星,高在雄,李相鎔,玄義泰,柳興根 건국대학교 1974 學術誌 Vol.17 No.1

The effect of reducing flood magnitudes, flood stages, and flood damage by upstream reservoir regulation are investigated in this study. The analytical procedures which has been established newly, are treated through this study for 7 index stations and same numbr of reaches. The method of this study could be expressed briefly as following procedures. Using stage-frequency relations and the potential damage survey data, damage-frequency relations are established, and from this, average annual flood damages computed. By holding out portions of the floods with various amounts of flood control storage in 6 reservoirs in the basin, routing were made to establish modified stage-frequency relations. From damage frequency relation, average annual damages are computed with and without condition of each control volume. The study result are concluded as follows; (1) The relationtship of corresponding water level between nearby stations are useful tools to adjust error of the data due to observation error and change of the gaging location. (2) The number of records about 10 years could not be applied for the statistical methods of flood frequency analysis. (3) The regional skew factors are recommended to apply flood frequency study by the log-Pearson Type III method. (4) The effect of damage reductions are greatly affectedin accordance with the routed flood. Therefore application of the Typical Tributary Contribution Flood are reasonable for this type of study. (5) In the North Han, effect of damage reduction due to the lacation of control point are gradually increased from upstream to downward until the confluence of North and South Han. (6) In the South Han, control effect are increased from Chungju to Yeoju where the maximum effect are analyzed and then decrease gradually until the confluence. (7) Better hydrologic and topographic combinations for the flood control are existed in South Han to compare with North Han in this study results.

Han’guk-ŭi Togyo Sasang (Religious Thought of Taoism in Korea)

Yi Py?ng-han(서평자) The Academy of Korean Studies 1986 Korea Journal Vol.26 No.5

Anti-inflammatory and Anti-oxidant Effects of PHBV/Collagen (PHCP) on Lipopolysaccharide-Induced Skin Inflammation

Jin-Yi Han3*, Xu Zi Guang, Jyung-Sik Kwak, Ki-Wan Oh, Han-Ik Bae 충북대학교 동물의학연구소 2012 Journal of Biomedical and Translational Research Vol.13 No.1

The anti-inflammatory effect of PHBV/Collagen (PHCP) was examined in a mouse model of lipopolysaccharide (LPS)-induced skin inflammation. Vascular permeability on the back skin was measured by the local accumulation of Evan’s blue dye after subcutaneous injection of LPS (30 μg site-1). Dye leakage in the skin showed a significant increase at 2 h after injection of LPS. This LPS-induced dye leakage was also completely inhibited by HO-1 inhibitor, ZnPP, and antioxidants, including methyl gallate, trolox, and mannitol. To study the possible mechanisms underlying the in vivo anti-inflammatory effect of PHCP against LPS-induced inflammation, we also examined the effects of PHCP on malondialdehyde (MDA) and glutathione levels in skin tissues and found that pretreatment with PHCP resulted in inhibited MDA elevation and a remarkable reduction of glutathione level. In addition, similar results were obtained after pretreatment with antioxidants, including trolox and mannitol, and HO-1 inhibitor, ZnPP. Histopathologically, an influx of neutrophils into the skin dermis was detected between 24 h and 72 h after LPS injection (30, 100 μg site-1), compared to control animals after injection of saline. This increase was greater in mice treated with 100 μg of LPS than in those treated with 30 μg of LPS and was significantly suppressed by pretreatment with PHCP, antioxidants, and HO-1 inhibitor. These results collectively suggest that PHCP has an anti-inflammatory effect against LPS-induced inflammation model in vivo and may be a good candidate for the skin tissue engineering biomedical application primarily through manipulation of the redox state.

Evaluation of Integrated ACC(Adaptive Cruise Control)/ CA(Collision Avoidance) on a Virtual Test Track

Donghoon Han1,Kyongsu Yi,Seungjong Yi 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10

철근 콘크리트 전단벽과 강재 보 전단접합부의 내진거동

이원호,윤현도,강대언,송한범,태경훈,박완신 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

Ductile coupled flexural wall is the primary seismic load resisting system of buildings. In these systems, connections are generally headed stud bolt connection. The purpose of experimental study is to evaluate the seismic behavior of these connection under cyclic loading. A comprehensive experimental test involving 4 specimens has been performed and this program is used to study the effect of value of moment and edge distance. Through experimental test, the seismic behavior of typical headed stud bolt connections was established.

하악골 충격시 안면 두개골의 응력분산양상에 미치는 구강보호장치의 역할에 관한 유한요소법적 연구

김일한,노관태,노현식,김지연,우이형,Kung-Rock Kwon,최대균 대한치과보철학회 2012 대한치과보철학회지 Vol.50 No.1

연구 목적: 이 연구의 목적은 하악골 충격 시 안면 두개골의 응력 분산양상에 미치는 구강보호장치의 효과에 대해 조사하는 것이다. 연구 재료 및 방법:: 구강보호장치를 제작하고 사람의 머리부위와 치열의 3차원적 유한요소 모델을 컴퓨터 토모그래피를 사용하여 제작하였다. 머리부위의 finite element model은 356,092요소와, 87,099절점으로 이루어져 있다. 그리고 skull과 maxillae, mandible, articular disc, teeth, 그리고 구강보호장치로 구성되었다. 경부의 움직임을 묘사하기 위하여 스프링이 사용되었다. 하악골의 충격점은 gnathion, center of inferior border 와 anterior edge of gonial angle이었다. 충격방향은 수직, 경사방향(45 도), 그리고 수평이다. 충격량은 0.1초당 800 N이었다. 결과: 수직충격을 가한 경우에는 구강보호장치의 장착여부와 무관하게 비슷한 응력과 분산양상이 나타났다(P>.05). 경사충격(45 도)을 가한 경우 구강보호장치를 장착한 모델에서는 응력이 치아와 안면골 및 두개골로 넓게 분산되었으나 이에 비하여 장착하지 않은 모델에서는 치아에 응력이 집중되었다(P<.05). 수평충격을 가한 경우 구강보호 장치를 장착한 모델에서는 응력이 치아와 안면골 및 두개골로 넓게 분산되었으나 이에 비하여 장착하지 않은 모델에서는 치아에 응력이 집중되었다(P<.05). 구강보호장치를 장착하지 않은 모델에서는 상악 치아에 응력이 집중되는 반면, 장착한 모델에서는 모든 충격실험에서 계측된 응력이 매우 낮았으며, 전달된 응력이 상악 치아와 안면골 및 두개골로 넓게 분산되었다. 결론: 구강보호장치는 외부충격 시에 하악에 수직으로 가해지는 충격에는 완충효과가 적었고, 45 도 경사 충격과 수평 충격에는 발생하는 응력을 안면골과 두개골의 넓은 범위로 분산시키고 응력을 감소시켜 응력의 완충 효과가 있었다. PURPOSE. The purpose of this study was to investigate the effects of a mouthguard on stress distribution under mandibular impact. MATERIALS AND METHODS. The FEM model of head consisted of skull, maxilla, mandible, articular disc, teeth, and mouthguard. The impact locations on mandible were gnathion, the center of inferior border, and the anterior edge of gonial angle. And the impact directions were vertical, oblique (45 degrees), and horizontal. The impact load was 800 N for 0.1 sec. RESULTS. When vertical impact was applied, the similar stress and the distribution pattern was occurred without the relation of the mouthguard use (P>.05). The model with mouthguard was dispersed the stress to the teeth, the facial bone and the skull when the oblique (45 degrees) impacts were happened. However, the stress was centralized on the teeth in the model without mouthguard (P<.05). The model with mouthguard was dispersed the stress to the teeth, the facial bone and the skull when the horizontal impacts was occurred. However, the stress was centralized on the teeth without mouthguard (P<.05). For all impact loads, stress concentrated on maxillary anterior teeth in model without mouthguard, on the contrary, the stress was low in the model with mouthguard and distributed broadly on maxillary anterior teeth, facial bone, and skull. CONCLUSION. The mouthguard was less effective at shock absorbing when vertical impact was added. However, it was approved that mouthguard absorbed the shock regarded to the oblique (45 degrees) and horizontal impact by dispersing the shock to the broader areas and decreasing the stress.

삼성 타워팰리스 구조시스템 평가

이원호,현창국,강정호,노재천,조중현,송한범 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose of this study was to analyze the housing mobility behavior according to the income change and to predict the probability of upward and downward movements. A binary logit model was used with the data which were obtained by the Korea Research Institute for Human Settlements in 1989. The sample size was 1620 households in Seoul. The results of this study were as follows; the upward movement probability in rental housing or in single housing was higher than that in owned housing or in apartment housing as household income increased.

ZSM-5 제올라이트에서 n-프로필알코올의 톨루엔에 대한형상 선택적 촉매반응

李漢鈗,安秉濬 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-

변형된 ZSM-5 제올라이트 촉매에서 툴루엔의 n-프로필알코올에 대한 산촉매 반응이 조사되었고, 이알킬벤젠 이성질체들의 100℃에서의 흡착 실험이 수행되었다. 4-프로필암모늄이온, 알루민산나트륨, 콜로 이달실리카 등으로부터 수열반응에 의하여 ZSM-5가 합성되었으며, H-, K-, Sr-, P-Mg-HZSM-5, H-Y 및 H-모더나이트 등이 전통적인 방법에 의하여 만들어졌다. HZSM-5에서 톨루엔의 n-프로필알코올에 의한 주반응생성물은 크실렌, 프로필톨루엔 뿐만 아니라 에틸톨루엔을 포함하며, P-Mg-HZSM-5에서는 이알킬벤젠이성질체중 높은 파라 선택성이 얻어졌다. 다양한 p-이성질체들의 확산계수는 1×10 exp (-10) ㎠/sec로 일정했으며 o-이성질체보다 m-이성질체가 10배 이상 느리게 나타났다. 이들 반응 및 흡착특성이 제올라이트의 세공구조에 의한 형상 선택서, 제올라이트의 산성도 등의 관점에서 해석되었다. The acid catalytic reactions of toluene with n-propylalcohol were investigate and the adsorption experimetns of dialkylbenzene isomers were carried our at 100℃ over modified HZSM-5 zeolites. ZSM-5 zeolite was synthesized by the hydrothermal reaction using 4-propylammonium ion, sodium aluminate and colloidal silica etc., and several zeolite catalysts, including H-, K-, Sr-, P-Mg-HZSM-5, H-Y and H-mordenite, were prepared by conventional methods. The main reaction products of toluene with n-propylalcohol over HZSM-5 catalyst include not only xylenes, propyltoluenes, but also ethyltoluenes and high para-selectivity among dialkylbenzene isomers was observed on P-Mg-HZSM-5 zeolite. The diffusion coefficients of various p-dialkylbenzenes are nearly the same, about 1×10 exp (-10) ㎠/sec and that of m-xylene was about on tenth of o-xylene. These reaction and adsorption characteristics were imterpreted in the light of the shape-selectivity related to the zeolite pore structure and the zeolitic acidity.

접합부 상세에 따른 철골 커플링 보의 내진거동

이원호,윤현도,송한범 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.3

Ductile coupled flexural wall is the primary seismic load resisting system of buildings. The coupling beams of these buildings must exhibit excellent ductility and energy dissipation capacity. To achieve better ductility and energy dissipation, steel coupling beam embedded in the reinforced concrete walls is proposed. A comprehensive experimental test involving 5 steel coupling beam specimens has been performed and results from this program are used herein to study the effect of details of steel coupling beams embedded in the reinforced concrete walls on seismic behavior. Through experimental test, the seismic behavior of typical steel coupling beams was established. These efforts have resulted in details for increasing the seismic capacity of steel coupling beam in the seismic behavior of buildings.

FUZZY를 이용한 GPS 수신기 위치데이터의 정확도 개선

이경웅,최한수 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2

The global positioning system(GPS) is a satellite based precise positioning system avaliable worldwide. The GPS have many error sources. The earth's ionosphere and atmosphere cause delays in the GPS signal that translate into position errors. Some errors can be factored out using mathematics and modeling. The configuration of the satellites in the sky can magnify other errors. The problem of accuracy on GPS measurement data can be meaningful In this study, we propose the method for GPS positioning accuracy improvement. The fuzzy set theory on PDOP(position dilution of precision) and SNR(signal to noise ratio) provide improved for measured positioning data. The accuracy of positioning has been improved by selecting data from original using the fuzzy set theory on PDOP and SNR.