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TDR을 이용한 세굴 모니터링 시스템 개발을 위한 기초 연구
유정동(Yu, Jung-Doung),이종섭(Lee, Jong-Sub),배명호(Bae, Myeong-Ho),박정희(Park, Junghee),윤형구(Yoon, Hyung-Koo) 한국방재학회 2018 한국방재학회논문집 Vol.18 No.5
세굴은 교량의 안정성에 있어 심각한 영향을 줄 수 있다. 본 연구는 TDR을 이용하여 교량에 발생한 세굴을 모니터링하기 위한 기초 연구로 수행되었다. 실내실험을 위해 내·외경이 각각 70 mm와 75 mm이고 길이가 200 mm인 소형 모형 교각을 제작하여 토조에 설치하였으며, 모형 교각에 32개의 전극을 약 7.36 mm의 간격으로 원형으로 배열하여 2선식 전송선로를 구성하였다. 전자기파를 송·수신하기 위하여 TDR을 이용하였다. 실험 결과, 세굴의 깊이가 깊어질수록 전자기파의 도달시간이 증가하는 것으로 나타났다. 또한, 실제 세굴 깊이와 실험을 통해 측정된 세굴 깊이가 유사하게 산정되었다. 본 연구의 결과는 TDR이 세굴을 모니터링하는데 좋은 기법이 될 수 있음을 보여준다. Scour is a critical factor that affects the stability of a bridge. This paper presents a fundamental study on the development of a Time Domain Reflectometry (TDR) system for monitoring scour around a bridge pier. The laboratory experiments were conducted using a small-scale model pier with inner and outer diameters of 70 and 75 mm, respectively and a height of 200 mm. The model pier was embedded in a soil tank. Electrodes were installed in a circular array alongside the model pier to configure two-conductor transmission lines. Electromagnetic waves were generated and detected using the TDR. The experimental results indicate that the round-trip travel time of the electromagnetic waves increase with an increase in the scour depth. In addition, the estimated scour depth is approximately the same as the actual depth. This study demonstrates that the TDR is an effective tool for monitoring scour.
유정우 ( Jungwoo Yoo ),여의동 ( Eui Dong Yeo ),이영구 ( Young Koo Lee ) 대한스포츠의학회 2017 대한스포츠의학회지 Vol.35 No.2
The definition of osteochondral lesion of the talus (OLT) is any defect involving both the articular surface and the subchondral bone of the talus. Many of these lesions are associated with acute ankle injury. Although many classification schemes for OLT have been proposed, Berndt and Harty`s 4-staging classification is most commonly used. Stage 4 lesions and symptomatic lesions under grade 3 are usually recommended to surgical treatment. The treatment approach for athletes should be more elaborate due to the need for an early return to play. Several different types of treatment are described for OLTs in athletes, including bone marrow stimulation, osteochondral autograft transfer system, and autogenous chondrocyte implantation. Osteochondral autograft transfer system shows good clinical outcome and has the advantages that could be applied to large defect and recurred lesions, however, it has some disadvantages in terms of the complications related with the donor site and the difficult approach to the medial lesions. Although autogenous chondrocyte implantation has been extensively applied for treating OLTs with successful clinical outcomes, it has some limitations that apply to athletes in terms of the 2-stage and complicated procedure and the insurance issues. Bone marrow stimulation being a simple and cost-effective procedure associated with a low complication rate and low postoperative pain has faster return to play and is recommended the first-line treatment for the OLTs of athletes.
전반사형광현미경법과 타원체맞춤 방법을 이용한 고체벽면 근처에서의 3 차원 박테리아 경로 추적
구상모(Sangmo Koo),진송완(Songwan Jin),이용구(Yongkoo Lee),전호정(Hojeong Jeon),유정열(Jung Yul Yoo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The motion of flagellated bacteria close to surfaces is relevant to understanding the early stage of Biofilm formation. When Bacterium cells are close to a surface, the cells often swim parallel to the surface in a circle for some time. The simplest and most effective way of understanding this motion is the individual cell tracking. In the present study, TIRFM is used to generate the evanescent wave near the surface so that it emits a green light due to eGFP gene transfection and illuminates a small specimen volume of about 100-㎚ depth. Also, using the PTV method, we can obtain the 3D motion data of bacteria near the surface. However, most of current 3D tracking methods, which are designed for spherical particles, is not optimized to track a bacteriumlike cell which is of a prolate ellipsoid. In this study, using the PTV method and proposing the ellipsoidal fitting to model the shape of bacteria realistically, we obtain the more accurate data of bacteria motion near the wall.
구정회,김문일,유정수,Chung Hoe Koo,Moon Il Kim,Chung Soo Yoo 대한화학회 1963 대한화학회지 Vol.7 No.4
The crystal structure of ethylenediamine dihydrochloride has been determined by the two-dimensional Patterson methods and refined by two-dimensional Fourier syntheses. The unit cell dimensions are a = 4.44${\pm}$0.02, b = 6.88${\pm}$0.02, c = 9.97${\pm}$0.02 ${\AA}$, ${\beta}$ = 92${\pm}$$1^{\circ}$. The space group is $P2_1_{/c}$. The carbon and nitrogen atoms in the ethylenediamine itself lie on one plane and its structure has a trans-form with a centre of symmetry in it, and C-C distance of 1.54 ${\AA}$, C-N distance of 1.48${\AA}$ and C-C-N bond angle of $109.07^{\circ}$. The molecules are linked by N-H${\cdots}$Cl hydrogen bonds with distance of 3.14, 3.16 and 3.22 ${\AA}$ forming three dimensional network. The values of reliability factor for F(okl), F(hol) and F(hko) are 0.11, 0.10 and 0.09 respectively.
발목의 외측 측부인대 불안정성에 대한 관절경적 변형 브로스트롬 술식
이영구(Young Koo Lee),여의동(Eui Dong Yeo),유정우(JungWoo Yoo) 대한정형외과학회 2018 대한정형외과학회지 Vol.53 No.2
발목의 외측 측부 인대 손상은 발목손상 중 가장 많이 발생하는 손상으로서 보존적 치료에도 불구하고 외측 불안정성 증상과 징후가 확인될 경우 수술적 치료를 고려하는데, 가장 흔하게 사용하는 방법은 관혈적 변형 브로스트롬 술식(modified Broström operation, MBO)이다. 최근 견관절과 슬관절의 경우처럼 발목관절에서도 관절경적 술기가 발전하면서 발목인대의 봉합도 관절경만을 이용한 방법으로 시도되고 있다. 특히 사체를 대상으로 한 외측인대 봉합 후의 생역학적 강도 측정 연구와 전향적 무작위 대조군 임상 연구에서 관절경적 MBO는 관혈적 MBO와 동등 이상의 결과가 보고된 바, 관절경적 MBO는 발목관절의 외측 불안정성에 대한 효과적인 치료 방법이며 나아가 관혈적 MBO를 대체할 수도 있는 수술법이라고 생각된다. 또한 이러한 관절경적 수술법을 바탕으로 최근에는 발목의 원위경비이개 및 삼각인대에 대한 관절경적 치료가 소개되고 발전되면서 향후 발목에 대한 관절경적 수술법은 더욱 발전할 것으로 기대된다. Lateral ankle sprain is the most common ankle injuries. Patients who fail conservative treatments are candidates for modified Broström operation (MBO). Traditionally, the primary surgical treatment performed is the open MBO. Recently, there has been an evolution in the arthroscopic treatment of lateral ankle injury. Several reports reveal biomechanically equivalent results of arthroscopic vs . open MBO when using matched cadaver pairs. Also there was no difference in the clinical or radiologic outcomes between the arthroscopic and open MBO in randomized controlled trial. Therefore, arthroscopic MBO is reasonable and good alternative treatment for lateral ankle injury. Actually new techniques of arthroscopic treatment for ankle injury is introduced about arthroscopic syndesmotic repair and arthroscopic deltoid repair. Arthroscopic techniques for ankle injuries seem to develop further in the future.