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A MODIFICATION OF THE MICHELET TECHNIQUE FOR SLIDING HORIZONTAL OSTEOTOMY: A CASE REPORT
Lee,Jin Gew,Davis Ⅲ,Isaac E.,Swift,James Q. 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.2
Ⅲ 앞 턱 부위가 짧고 후방으로 위치해 있을 때 턱의 높이를 증가시키고 전방으로 돌출시키는 축조 이부성형술의 방법으로는, 매식체 삽입술, 골 절단술, 골 전제술 또는 이들을 동시에 시행하는 혼합술등이 행해져 왔다. 그러나 매식체 삽입술에서는 감염 또는 매식체의 유동성 등의 합병증의 발병이 빈발하고 매식체의 밑 부위에 골이 흡수된다든지 연조직의 변화를 예측하기 어렵다든지 하는 복잡한 문제점들이 종종 보고되고 있다. 따라서 매식체를 이용하지 않는 골 절단술이나 골 절제술만을 이용한 다양한 방법의 이부성형술이 많이 시행되고 있다. 하악골이 전후방 관계로 발육부전인 환자에게 양측 하악지 시상분할술을 시행하여 전방 이동시킨 후 앞 턱의 위치를 좀더 개선하기 위하여 Michelet 테크닉의 변형법을 이용한 이부성형술을 추가로 시행하였다. 이 방법의 이부성형술은 턱의 수직적, 수평적 길이를 증가시키기 위하여 하악결합면 부위에 장부와 장붓구멍 모양을 한 골 절단술을 시행하고 광범위한 연조직경을 보존하여 골편으로의 혈류 차단을 최소화하였으며 나사를 이용한 견고한 고정을 용이하게 하였다. 이 술식은 턱을 수직적으로 증가시킬 때 두 골편 사이의 공간에 골 이식을 시행할 필요가 없으며, 금속판을 이용하지 않아도 정확한 위치에 골편을 고정하기가 용이하고, 또한 고정용 나사가 향후 골형성 부위에 위치하게 된다는 장점을 경험하게 되어 이에 한 증례를 보고하는 바이다.
연약지반 표층보강재의 인장강도와 복토두께의 지지력개선효과에 관한 실험적 연구
함태규(Tae-Gew Ham),조삼덕(Sam-Deok Cho),양기석,유승경(Seoung Kyoung You) 한국토목섬유학회 2008 한국토목섬유학회 학술발표회 Vol.2008 No.4
Engineering characteristics (tensile strength, sand mat stiffness, abrasion resistance) of surface reinforcements were evaluated and indoor model test was conducted to examine the influence of the engineering characteristics of surface reinforcements on the bearing characteristics of very soft ground strengthened with surface reinforcements. According to the outdoor exposure test with geotextiles and geogrid for 30 days, the strengths of materials reduced by less than 3.0% compared with the original specimen. Such small deterioration rate is within the product deviation and experimental error tolerance, therefore, judged to be negligible in the estimation of the strength reduction coefficient. According to the pull-out test results, the abrasion resistances between sand/geotextile/clay and sand/geogrid/clay were c=0.03㎏/㎠, φ=26.5˚ and c=0.02㎏/㎠, φ=22.0˚, respectively, and that of the geotextile was larger than geogrid by 1.2 ~ 1.5 times. According to the calculation, the bearing capacity ratios of geotextile according to the sand mat were 6.10, 7.78, and 11.1, at the sand mat of 0, 5㎝, and 10㎝, respectively, showing good correlation between the sand mat thickness of the casing soil and bearing capacity.
ON THE INTIAL VALUE DEPENDENCE OF THE PROPER QUADRATIC FIRST INTEGRALS IN DYNAMICAL SYSTEMS
Rew, See-Gew 東國大學校 1988 論文集 Vol.27 No.-
1946년, T.Y.Thomas는 그의 著書를 통하여 古典力學系에 관한 固有2次 第1積分을 取扱한 以後 最近까지 物理學的이며 幾何學的인 意味를 解析하지 못하고 있는 실정이다. 1972년, M. Ikeda 및 Y. Nishino에 의하여 單純 力學系에 있어서 固有 2次 第2積分을 3가지의 類型으로 分類하고 있을뿐이다. 筆者는 本小考를 통하여, 運動의 trajectories에 着眼하여 初期値를 導入함으로 固有 2次 第1積分을 더욱 細分化하였을 뿐만아니라, 그 結果 物理學的으로는 Total energy는 初期値와 無關함을 밝혀보았다. 이와 같은 接近方法은 窮極的으로는 幾何學의 오랜 宿願이던, 一般的인 Killing tensor을 硏究하는데 도움이 되리라 믿는다. Although the problem of the proper quadratic first integrals has been treated by various author [1], [5], [6], etc., it remains open what is the meaning of the quadratic first integrals, We have focused our attention on this problem for a simple dynamical system in a 3-dimensional Euclidean space, mainly on the relations between the quadratic first integrals and the trajectories of a particle motion. M. Ikeda and Y. Nishino have classified the dynamical system treated here into the three Case Ⅰ, Ⅱ and Ⅲ. Among the proper quadratic first integrals, which contain 5 independent factors, but in CaseⅠ, there is no proper quadratic first integrals. There we led to consider the CaseⅡ and Ⅲ. In the present paper, we have further classified te proper quadratic first integrals with respect to the initial values of te trajectories. For the CaseⅢ, the proper quadratic first integrals exhibit a simple dependence of the initial position, but not of the initial velocity. Importance is the CaseⅡ, since we must consider the energy dependence when we treat the velocity dependence. We may say that among the quadratic first integrals the total energy is the only one that does not depent on any initial condition. Analysis treated here is closely related with the study of the general Killing tensors remains open in the meaning. Therefore, the present work has made a certain contribution to the above problem of the Killing tensors. The geometric and physical meaning of the proper quadratic first integrals have remained open for a long time. For the simple dynamical system as an illustration, it is shown that among the proper quadratic first integrals, someof them exhibit certain dependence on the inital values and the others do not. Therefore the proper quadratic first integrals can be classified into several classes with respect to the properties of the initial value dependence.
초연약지반의 지지력계수 N<SUB>c</SUB>에 관한 실험적 검토
함태규(Tae-Gew Ham),조삼덕(Sam-Deok Cho),양기석,유승경(Seoung-Kyoung You) 한국지반신소재학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.11
This study, as basic research which was intended to develope the surface reinforcement method using reinforcement material which is applicable to very soft ground in Korea, was aimed at proposing the design parameter for the surface ground improvement method. To that end, a wide width tensile test using geotextile, geogrid and steel bar (substitute for bamboo) and 25 kinds of the laboratory model tests with the end restraint conditions of the reinforcement that comprises the constrained and partially constrained (3 types) conditions were conducted. And the result indicated that the modulus of subgrade reaction or Nc value (5.3) apparently overestimated the bearing capacity of very soft ground such as dredged ground.
채기주(Key Gew Chae),박종현(Jong Hyeon Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This paper proposes an optimal galloping trajectory which costs low energy and guarantees the stability of the quadruped robot. In the realization of the fast galloping, the trajectory design is important. As a galloping trajectory, we propose an elliptic leg trajectory, which provides simplified locomotion to complex galloping motions of animals. However, the elliptic trajectory, as an imitation of animal galloping motion, does not guarantee stability and minimal energy consumption. We propose optimization based on the energy and stability using a genetic algorithm, which provides the robust and global solution to a multi-body, highly nonlinear dynamic system. To evaluate and verify the effectiveness of the proposed trajectory, computer simulations were carried out.