http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 허승열 (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
-
대퇴골 전자간부 골절에 있어서 정복 방법에 따른 Knowles pin의 안정성에 대한 연구
허승열,박상원,이홍건 고려대학교 의과대학 1988 고려대 의대 잡지 Vol.25 No.3
The present experiment was designed to determine the maximal load supported on the femoral head, neck, intertrochahteric and shaft, then observe their :series of pattern of failure to loading force in the three different reduction of varus, valgus and anatomical position. The specimens consist of eighteen fresh embalmed adult femora obtained from cadaver used in the Department of Anatomy of Korea University Medical Colledge. Three femora were tested as control and another fifteen femora were divided in three groups, e.g. anatomical, valgus and varus reduced position. Simulated intertrochanteric fracture across trochanteric line were produced in all specimens except three femora as control, with inclination of fracture line at 120 degree angle from the shaft of femur. The distal femoral shaft was transected at the line of thirty centimeters from the tip of greater trochanter and specimens to be tested was tightly potted in a support fixture filled by epoxy. The femoral shaft to be tested were placed at an angle of eighty degree of inclination from the horizontal line to provide physiological distribution of weight bearing in static condition, then all specimens were examined for the maximal loading force supported on the femoral head with Instron Floor Machine (Model 1350). During each test with a deformation rate 1.45 mm/min, continuous tracing of load versus deflection was recorded on graphic paper and a series of photographs were taken to determine failure for maximal force supported on the femoral head, particularly the separation of fractured fragments fixed with Knowles pins in intertrochanteric fracture. The results obtained are as follows: 1. The maximal force supported on the femoral head in each group: 1) Control group ranged from 620Kg to 890Kg, and mean was 730±142Kg. 2) Anatomical group ranged from 46Kg to Ⅲ. 3Kg, and mean was 70±24kg. 3) Valgus group ranged from 177.5Kg to 375Kg 3nd mean was 249.5± 81kg. 4) Varus group ranged from 35Kg to 65Kg, and mean was 46±11.7Kg. 2. The pattern of failure for maximal force in each group: 1) Control group produced subcapital fracture. 2) Anatomical group demonstrated at first, widely opened fracture line of the lateral cortex of greater trochanter and femoral head gradually fell into more and more varus position until separation of prorimal and distal fragment in the final stage. There are several fractured fragments of posterior medial aspect of intertrochanteric region. 3) Valgus group revealed, under the heavily increasing force, sudden longitudinal fracture originated at the orifice of insertion of Knowles pins, and then proximal fragment gradually fell down until sudden separation of proximal fracture fragment from distal fragment without remaining any fragment at the posterior aspect of intertrochanteric region. 4) In varus group, under the mild load, the head gradually fell into more and more varus position after the initial gap formation at the lateral aspect of greater trochanter where fracture line crossed around intertrochanteric region, and then suddenly the proximal fragment was ,completely ,separated from distal fragment 5) The mechanical failure of knowles pin was not observed in all fifteen cases of three experimental group.
-
Homeotropic Aligned Liquid Crystal Molecules in Dye-sensitized Solar Cells for High Efficiency
김현경,허승열,강완석,이기동,진성호 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.5
We optimized the alignment of the embedded liquid crystal (LC) molecular in quasi-solid state dye-sensitized solar cells (DSSC) to enhance the photovoltaic performance. The aligned LC molecular increases the ordering strength in the electrolyte so that it can provide a better pathway to transfer generated charges inside the polymer electrolyte. We performed experiments with three types of electrolytes, a typical polymer electrolyte, a polymer electrolyte with LC, and a polymer electrolyte with an aligned LC. The electro-optical characteristics obtained from these experiments were compared with each other for validation. We found that the aligned LCs in a polymer electrolyte can provide higher photovoltaic performance than conventional electrolytes.
-
-
Effect of the Surface Anchoring Energy on Modeling the Defect in the Liquid Crystal Director Field
Wan-Seok Kang,주우용,허승열,한학용,이기동,정봉식,Hyung-Jin Youn 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.4
In this research, we studied the effect of the surface anchoring energy on the defect modeling in the liquid crystal (LC) director field. In order to model the defect of a LC cell, we make use of the fast Q-tensor method, in which the scalar order parameter S and the orientation of the LC director at each gird point of the LC cell can be calculated. The modeling of the defect generation was performed by using the “pincement” of Bouligrand, which shows a reverse tilt-wall and a pair of defect nucleations. We carefully inspected the position of the defect generation in the LC cell as a function of the surface anchoring energy. By using the fast Q-tensor method to consider the tensor form of the surface anchoring energy, we could model both the LC orientation and the generated defect more precisely.
RISS연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
