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- 저자 : 金錫中 (검색결과 332 건)
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金錫中 강원대학교 산업기술연구소 1984 産業技術硏究 Vol.4 No.-
Buckling is a significant behavior to be considered whenever we design steel structures. In the case of H-shape beams, the lateral buckling occured by bending moment must be considered, Because of the lateral buckling of H-shape beams, the bending strength of the beams are determined by the lateral buckling stress instead of the allowable bending stress. lateral buckling stress equation, consisting of two terms, i. e. ***** , has been using, but for the practical purpose of use the following equations are using two, i. e. ***** . When we use the above equations, the results are different according to the shape of beam section, and they are rather complex. In this study lateral buckling stress equation is derived, and the proposed formula ***** is compared with above mentioned two basic and practical equations. To verify the proposed formula experimentaly, 16 H-shape beams which have different slender ratios are tested by applying pure bending momet. Through the experiments the buckling behavior of H-shape beams is clarified, and the results shows that the proposed formula ***** is accurate enough for practcal purpose.
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자가 슬개건과 네 겹 슬괵건을 이용한 전방 십자 인대 재건술의 비교
김석중,권오수,최동원,송호욱,강현택,인용,Kim, Seok-Jung,Kwon, Oh-Soo,Choi, Dong-Won,Song, Ho-Wook,Kang, Hyun-Taek,In, Yong 대한관절경학회 2004 대한관절경학회지 Vol.8 No.1
목적: 자가 슬개건과 네 겹의 슬괵건을 이용한 전방 십자 인대 재건술의 결과를 비교하고자 한다. 대상 및 방법: 2000년 5월부터 2002년 2월까지 전방 십자 인대 재건술을 시행받고 최소 2년이상 추시가 가능하였던 41예를 대상으로 하였으며 평균 추시기간은 슬개건 군이 35.9${\pm}$3.8개월, 슬괵건 군이 27.0${\pm}$2.4개월이었다. 재건술 시 사용한 이식건은 자가 슬개건 군이 20예, 자가 네 겹 슬괵건 군이 21예였다. 최종 추시시 결과 평가는International Knee Documentation Committee(IKDC) 평가 기준, KT-2000 관절계, 방사선학적 검사와 압통, 감각 이상 등 이식건 공여부 병변을 이용하여 판정하였으며 두 군간의 차이를 비교 분석하였다. 결과: IKDC 평가 기준상 B(거의 정상) 이상의 양호한 결과를 보인 비율이 자가 슬개건 군에서 80%, 네 겹 슬괵건 군에서 76.2%로 양 군간 차이가 없었다. KT-2000 관절계를 이용한 최대 도수 부하 검사상 자가 슬개건 군에서 평균 1.50${\pm}$1.31 mm, 네 겹 슬괵건 군에서 1.89${\pm}$1.05 mm로 양 군간에 차이가 없었다. 방사선 사진상 네 겹 슬괵건 군에서 슬개건 군보다 현저한 터널 확장 소견을 보였다. 이식건 공여부 평가상 슬개건 군에서 30%, 네 겹 슬괵건 군에서 9.5%의 합병증 소견을 보였다 ·결론: 횡고정 핀 및 Intrafix 고정 방법을 이용한 자가 네 겹 슬괵건 전방 십자 인대 재건술은 자가 슬개건을 이용한 전방 십자 인대 재건술과 임상 결과에서 유의한 차이가 없는 좋은 결과를 보였으며 공여부 합병증은 적어 전방십자 인대 재건술의 좋은 술식의 하나로 사료된다. Purpose: To compare the results of two different autografts used to reconstruct the anterior cruciate ligament(ACL): bone-patellar tendon-bone and quadruple hamstring tendon. Materials and Methods: Forty one cases (20 bone-patellar tendon-bone cases and 21 quadruple hamstring tendon cases) were followed up more than 2 years postoperatively. Patellar tendons were fixed with interference screws and hamstring tendons were fixed with cross pins and intrafix sheaths and screws. Follow-up results were evaluated with KT-2000 arthrometer, International knee Documentation Committee(IKDC) evaluation form and follow up X-ray Donor site morbidity was analysed. Results: Final IKDC) scores more than B grade and side to side differences of manual maximum test using KT-2000 arthrometer showed insignificant differences(p>) between the two groups. Plain radiographs of hamstring group showed marked widening of the femoral and tibial tunnels at postoperative 2 years. Patellar tendon group showed 30% rate of anterior knee complications. Conclusion: ACL reconstruction using autogenous hamstring graft with new fixation method showed comparable clinical results to using autogenous patellar tendon graft with fewer anterior knee symptoms.
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근접장 광기록 시스템용 전자기구동 액추에이터의 설계 및 평가
김석중,이용훈,이철우,서중언 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.11
Combination of magnetic recording technology and optical recording technology such as Near Field Optical Recording is watched recently. In order to accomplish this technology, the development of an electromagnetic driven mm-sized mirror shifting laser beam in track direction have to needed. In Near Field Optical Recording System, shifting laser beam in track direction mean as fine tracking and means as coarse tracking. Therefore in Near Field Optical Recording, 2-stage actuator is composed of servo controller in reading or recording information on disc layer. In our research, through design and simulation process of driven mm-sized mirror, we arrange systematically design process of driven mm-sized mirror having good frequency transfer characteristics. Design and simulation processes included modal analysis of spring, calculation of magnetic moment according to the number of turns and geometric configuration of coil and magnetic circuit analysis meaning that calculation of magnetic flux density in air gap of magnetic circuit. After that we design and make parts of driven mm-sized mirror, assemble and evaluate our electriomagnetic driven mm-sized mirror. we compared design values with actual characteristic values and present solution scheme. Through these processes we performed manufacturing of an electromagnetic driven mm-sized mirror having good frequency-domain characteristics and high sensitivity characteristics.
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김석중,김성남 대한설비공학회 1999 설비저널 Vol.28 No.4
최근 들어, 생활수준의 향상과 인구의 증가로 인하여 서울 주변에는 위성도시가 건설되고 이러한 위성도시의 완성으로 공동주거(아파트)의 관심은 날로 높아져 가며, 생활양식의 변화로 인하여 건축물에서 생활용수의 사용량이 급격히 증가하고 있다.
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김석중,옥인영,주인탁,송석환,하기용,김용훈,Kim, Seok-Jung,Ok, In-Young,Chu, In-Tak,Song, Seok-Whan,Ha, Kee-Yong,Kim, Yong-Hoon 대한족부족관절학회 2003 대한족부족관절학회지 Vol.7 No.2
Purpose: To evaluate the effectiveness of ankle arthrography in diagnosis and treatment of the ankle sprain. Materials and Methods: Arthrography was performed to eighteen patients who were diagnosed as ankle sprain clinically from September, 1990 to April, 2003. Splint immobilization for three days and return to daily life were for the eleven patients who showed normal limits of extension of joint and no dye leakage on arthrography, cast for 3 weeks and compression brace wearing were for 4 patients who showed anterior talofibular ligament tear on arthrography. 3 patients diagnosed as anterior talofibular and calcaneofibular ligament tears were treated with cast for 6 weeks and then brace for 3 weeks. Results: The range of motion of the injured joint was recovered normally at the time of 3 month of postoperative follow up examination. But two patients complained a mild pain after exercise but it did not affect ordinary activities. Eleven patients who were normal on arthrography returned to daily activities in a week. Conclusion: It is reasonable to determine the extent of ankle sprain and treatment method for it using arthrography.
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