FEM 3차원 모델을 이용한 인공관절 대퇴 Stem 경계면의 미세운동 분석

김성곤,최형연,채수원,Kim, Sung-Kon,Choi, Hyung-Yun,Chae, Soo-Won 대한의용생체공학회 1996 의공학회지 Vol.17 No.1

In cementless total hip arthroplasty(THA), an initial stability of the femoral component is mandatory to achieve bony inyowth and secondary long term fixation. Primary stability of the femoral component can be obtained by minimizing the magnitude of relative micromotions at bone stem interface. An accurate evaluation of interf'ace micromotion and stress/strain fields in the bone-implant system may be relevant for better understanding of clinical situations and improving THA design. Recently finite element method(FEM) was introduced in'orthopaedic research field due to its unique capacity to evaluate stress in structure of complex shape, loading and material behavior. The authors developed the 3-dimensional finite element model of proximal femur with $Multilock^{TM}$ stem of 1179 blick elements to analyse the micromotions and mechanical behaviors at the bone-stem inteface in early post-operative period for the load simulating single leg stance. The results indicates that the values of relative motion for this well fit stem were $150{\mu}m$ in maximum $82{\mu}m$ in minimum and the largest relative motion was developed in medial region of Proximal femur and in anterior-posterior direction. The motion in the proximal bone was much greater than in the distal bone and the stress pattern showed high stress concentration on the cortex near the tip of the stem. These findings indicate that the loading on the hip joint in the early postoperative situation before achieving bony ingrowth could produce large micromotion of $150{\mu}m$ and clinicaly non-cemented THA patient should not be allowed weight bearing strictly early in the postoperative period.

Gelatinization Properties of Heat-Moisture Treated Potato and Sweetpotato Starches

김성곤,이신영,박용곤,Kim, Sung-Kon,Lee, Shin-Young,Park, Yong-Kon Korean Society of Food Science and Technology 1987 한국식품과학회지 Vol.19 No.5

감자 및 고구마 전분의 수분-열처리에 따른 호화특성을 비교하였다. 수분-열처리에 의하여 전분의 물결합능력은 증가하였으며 그 정도는 고구마전분이 더 현저하였다. 전분의 blue value는 수분-열처리에 의하여 영향을 받지 않았다. 아밀로그라프의 점도는 수분-열처리에 의하여 크게 감소하였으며, 최고 점도는 나타나지 않았다. 가성소다에 의한 전분의 호화는 감자가 고구마 전분보다 쉬웠으며, 수분-열처리에 의하여 호화에 필요한 알칼리의 농도는 증가하였다. KSCN에 의한 전분겔의 부피는 감자가 고구마전분보다 높았다. 감자 및 고구마 호화전분은 항복응력을 갖는 의가소성 유체의 성질을 보였으며, 수분-열처리에 의하여 점조도지수 및 항복응력이 크게 감소하였다. Gelatinization properties of heat-mositure treated potato and sweet potato starches were investigated. Water-binding capacity of starch was increased by heat-mositure treatment, which was more pronounced in sweet potato starch. Blue value was not affected by the treatment. Amylograph viscosities were decreased by heat-mositure treatment, which was more pronounced in potato starch. Critical concentration of NaOH for gelatinization of starch increased as moisture level increased. Gel volume of starch upon KSCN gelatinization was higher in potato starch. Gelatinized starches showed Binghamapseudoplastic behavior. Consistency index and yield stress were drastically decreased upon heat-moisture treatment.

시뮬레이션 모형과 실험설계법을 활용한 창정비 비용대 효과 분석 사례

김성곤,이상진,Kim, Sung-Kon,Lee, Sang-Jin 한국시뮬레이션학회 2017 한국시뮬레이션학회 논문지 Vol.26 No.3

본 연구는 복수 품목을 정비하는 단일 정비부대의 정비 프로세스를 시뮬레이션으로 모델링하였다. 이를 통해 정비능력을 공유한 정비창이 최적 비용으로 구성품 가동률과 목표 가동율 등을 달성하는지를 분석할 수 있다. 구성품 가동률과 정비시간 등을 핵심 성과지표로 하여 육군 항공기 정비단 엔진 정비프로세스에 대한 시뮬레이션 모델을 구성하고 실증연구를 하였다. 영향요소의 식별을 위해 NOLH 실험설계법을 적용하여, 33가지 시나리오를 구성하고 다중회귀분석을 수행하였다. 이 비용분석 연구를 통해 정비 프로세스의 개선사항을 식별할 수 있었다. 본 연구는 시뮬레이션을 통해 복수품목을 정비하는 단일 정비부대의 비용대 효과 분석 모형을 제공했다는데 의의가 있다. This paper is to study the simulation model of depot maintenance system that analyzes logistics supportability such as component availability and cost of target equipment. A depot maintenance system could repair or maintain multiple components simultaneously. The key performance indicators of this system are component availability, repair cycle time, and maintenance cost. The simulation model is based on the engine maintenance process of army aviation depot. This study combines the NOLH(Nearly Orthogonal Latin Hypercube) experimental design method, to composes 33 scenarios, with a multiple regression analysis to find out major factors that influence on key performance indicators. This study is significant in providing a cost-effectiveness analysis on depot maintenance system that is capable of maintaining multiple components at the same time.

Physicochemical Properties of Tongil(Indica type) and Paldal (Japonica type) Rice Starch

김성곤,한태룡,이양희,다포로니아비엘,Kim, Sung-Kon,Hahn, Tae-Ryong,Lee, Yang-Hee,D'Appolonia, B.L. Korean Society of Food Science and Technology 1978 한국식품과학회지 Vol.10 No.2

Physicochemical properties of rice starches from Paldal(japonica type) and Tongil(indica type) were investigated. There were no significant differences in water-binding capacity, blue value and amylose content between the two starches. Paldal starch showed a higher value for-swelling power than Tongil starch. Amylograph data showed that both Paldal and Tongil starches had similar paste viscosities except setback in which Tongil starch showed a higher value. No significant differences were observed for intrinsic viscosity and glucose units per segment between Paldal and Tongil amylopectin fractions. However, the intrinsic viscosity for Tongil amylose was considerably higher than Paldal amylose. The rate of retrogradation of Tongil starch gels at $21^{\circ}C$ was faster than Paldal starch gels. 통일 및 팔달쌀 전분의 이화학적 성질을 살펴본 바, 전분의 물결합능력, blue value 및 아밀로스 함량에 서로 차이가 없었다. 팔달 전분은 통일 전분에 비해 팽화력이 높았다. 아밀로그라프에 의한 두전분의 차이는 볼 수 없었으나 통일이 팔달보다 $50^{\circ}C$로 냉각시 점도가 다소 높았다. 또한 통일 아밀로스의 intrinsic viscosity는 팔달 아밀로스보다 높았으나 아밀로펙틴은 두 전분모두 비슷한 값을 보였다. 전분 gel의 retrogradation 속도는 $21^{\circ}C$에서 통일이 팔달보다 다소 빨랐다.

환원된 산화 그래핀 표면에 의사커패시턴스 거동을 갖는 폴리도파민의 기능화 및 이의하이브리드 커패시터 전극 소재 응용

김성곤(Sung-Kon Kim) 한국고분자학회 2019 폴리머 Vol.43 No.1

본 연구에서는 환원된 산화 그래핀 전극 표면에 가역적인 산화·환원 반응을 유발하는 폴리도파민 물질을 기능화하여 하이브리드 소재를 제조하였고, 이를 고용량 슈퍼커패시터 전극 소재로 응용하였다. 폴리도파민의 단량체인 도파민의 중합시간을 달리하여 그래핀 표면에 기능화 정도를 조절하였고, 전극 소재로써의 전기화학적 성능을 고려한 최적의 도파민 중합시간을 확인할 수 있었다. 특히, 폴리도파민 내 하이드로퀴논 관능기는 방전 시 2개의 양성자 및 전자를 잃고 퀴논 그룹으로 상호변환이 되고, 충전 시에는 역시 2개의 양성자 및 전자의 이동을 동반하며 역반응이 유도된다. 충·방전에 따라 가역적인 이 반응으로 인해 하이브리드 커패시터 전극 소재는 높은 커패시턴스 성능, 율성능, 및 장기간 충·방전 안정성 구현이 가능하였다. Herein, we report hybrid electrodes using mussel-inspired redox-active polydopamine (PDA) functionalized on reduced graphene oxide (rGO) for high-performance supercapacitors. The extent of polymerization of dopamine is controlled by the polymerization time of dopamine that demonstrates the optimized conditions for hybrid electrodes in terms of electrochemical performances. Particularly, the PDA provides not only hydroxyl and amino groups (amphiprotic groups), but also fast and reversible quinone-hydroquinone proton-coupled electron-transfer reactions, enabling improved capacitive behaviors with respect to areal capacitance, rate capacity, and long cycle lives.

Effect of Temperature on Cooking Rate of Soybean

Sung-Kon Kim(김성곤),Kwangho Cho(조광호),Jong-Goon Kim(김종군) 한국식품과학회 1986 한국식품과학회지 Vol.18 No.5

시멘트를 이용한 대퇴stem 고정술

김성곤 ( Sung Kon Kim ) 대한고관절학회 2010 Hip and Pelvis Vol.22 No.3

Cemented total hip arthroplasty was first introduced by Sir John Charnley in 1961 and it has become one of the principal fixation techniques for fixation of an implant. The surgical technique has since been modified and this has resulted in improved longevity and reliability. The clinical success of the cemented technique has varied in literature, and this has been reported as 30~40% failure to 2% failure for 14 years of follow up using the 2nd generation cement technique. Currently, the successful clinical results can be contributed to the better developed design of the femoral stem and the advancement of the 3rd and 4th generation cement fixation techniques. As society gains more elderly people, for the older patients who have osteoporosis, a wide and thin femur would be the best indication for cement fixation in order to achieve early stability and better clinical results. It is imperative to learn and practice performing the exact cement fixation technique to achieve the best clinical results.

실온 및 고온 저장시 쌀밥의 노화 속도

김성곤(Sung-Kon Kim),변유량(Yu Ryang Pyun) 한국식품과학회 1982 한국식품과학회지 Vol.14 No.1

쌀 배유세포 전분복합체와 단백질체의 미세구조

김성곤(Sung Kon Kim),장병수(Byung Soo Chang),이수정(Soo Jeong Lee) 한국응용생명화학회 1996 Applied Biological Chemistry (Appl Biol Chem) Vol.39 No.5

The ultrastructure of the compound starch granules and the protein bodies of Odaebyeo rice of early matured variety were examined by ligth microscope and electron microscope. The endosperm cell appeared rectangular or octangular shape on the cross section. The thickness of cell wall containing of membraneous materials was about 0.5 ㎛ in diameter. The starch cell was filled compactly with globular or oval shaped compound starch granules with the size of 20∼25 ㎛ in diameter. The compound starch granules were consisted of central core starch granule and concentrical 2∼3 layers of starch granules. The average thickness of the starch granules were about 5 ㎛. Most protein bodies were found in the aleurone layer. The globular protein bodies were scattered near the compound starch granules and 2.5∼3 ㎛ in diameter. The protein bodies composed of central electron dense materials and peripheral electron loose materials in limiting membrane.

Acetabular Cup의 Version측정에 관한 연구

김성곤(Sung Kon Kim),박상원(Sang Won Park) 대한정형외과학회 1983 대한정형외과학회지 Vol.18 No.6