후방순환계 뇌동맥류의 임상분석

임동준,이훈갑,정흥섭,김봉룡,권택현,이기찬,서중근 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.11

3經間 連續合成橋의 ASD方法과 旣存設計法에 관한 比較分析

정택동 서울산업대학교 산업대학원 1993 大學院論文集 Vol.2 No.-

우리나라에서는 강교를 허용응력설계법으로 설계하고 있지만 미국등의 선진국에서는 1973년부터 하중계수설계법(Load Facor Design)으로 설계하고 있으며 1976년부터 AISI 및 AASHTO에서는 ASD(Auto Stress Design)방법에 대한 연구가 시작되어 1985년에는 이에 대한 지침시방서가 작성되었으며 실제 설계에 적용되어가고 있다. 하중계수설계법은(-) 최대 휨모멘트의 교각지점에서 10% 모멘트를 (+) 휨모멘트 지역으로 재분배하여 Shakedown현상을 개략적으로 인정하여 설계하고 있으나 ASD 방법은 이러한 교각지점의 재분배모멘트를 비탄성회전각으로부터 계산하여 보다 합리적으로 Shakedown현상으로 인한 Automoment의 잇점을 이용한다. 그러므로 허용응력설계법보다 이 재분배되는 모멘트 만큼의 강재를 절약할 수 있다. ASD방법에서는 구조부재의 어떤부분에 항복이 일어나도 반듯이 구조물이 파괴되지는 않는다는 사실과 실제하중에 하중계수를 곱하여 안전율을 적용한 하중으로 규정된 파괴 상태를 대응시키는 방법으로 실험을 통하여 부재가 지탱할 수 있는 최대한의 강도를 얻음으로서 하중의 특성과 부재의 특성을 고려하여 설계한다. 본 논문에서는 ASD방법의 기본 개념을 이용하여 3경간연속합성교(26m+35m+26m)의 (-)최대 휨모멘트의 교각지점에서 재분분배모멘트를 계산하여 3가지 하중단계(Service Load, Over Load, Maximum Design Load)에 대하여 검토하였으며 같은 교량제원으로 하중계수설계법과 허용응력설계법으로 설계하여 강제크기를 결정하고 각 설계법의 강재중량을 비교해보면 ASD방법은 허용응력설계법보다는 40%, 하중 계수설계법보다는 4%의 강재를 절약할 수 있으며 허용응력설계법에 의한 강재로 Rating에 대해 비교하면 교량에 재하할 수 있는 활하중은 ASD방법 DB-44. It, 하중계수 설계법 DB-42.8t, 허용응력설계법은 DB-24.3t으로서 ASD방법은 허용응력설계법의 1.84배와 하중계수 설계법의 1.04배의 활하중을 더 재하시킬 수 있음을 알 수 있었다. 그러므로 우리나라에서도 ASD설계방법에 대한 연구와 이에 따른 모형실험을 실시하고 ASD방법의 시방서를 작성하여 실제교량에 반영함으로서 강재도 절약하고 보다 합리적으로 설계할 수 있도록 토목기술자가 다함께 노력해야 될 것으로 사료된다. At home, the steel birdges is designed by a Workins Stress Design method, however in the developed countries such as U.S.A., etc., it is designed by a Load Factor Design method from 1973, and from 1976, in AISI and AASHTO, researches into Auto Stress Design, and in 1985 a guide specification on that was Composed and applied to actual design. In the Factor Design method, design is done in mays of that 10% moment as the pier point of the(-) max. bending moment is redistributed to the area of(+) bending moment, therefore with phenomenon of 'shakedown' being generaily recognized. However, in the ASD method, by calculating the redistributing moment at such pier point from the revolving inelastic rotation, the merit of the Automoment caused by the phenomenon of'shakedown'is used, Therefore, a quantity of the steel material as much as redistributed than that in the Workins Stress Design can be econmized. The ASD method is one that responds to the regulated state of demolition with the fact that even if there happened any surrender on any part of structural material, the structure should not be demolished and the load apllied with safety rate by multiplying actual load with the coefficient of load, which is to design in consideration of the charactertics of both load and materials. In the study, using the basic concept of the ASD method, three loading stages-Service Load, Over land and Maximum Design Load-were reviewed by calculating redistributive moment at the pier point of the (-)max. beending moment of there span Continuous Composite bridges(26m + 35m + 26m). With the same materials for a bridge, the size of the material was decided by designig in the method of Load Factor Design and that of Workins Stress Design, and when the weights of the steel material in each case of design, the ASD method can economize 40% of the material than of Workins Stress Design and 4% than of Load Factor Design, and in Comparison of ratings with the steel material by Workins Stress Design, the active load applicable to the bridge was DB-44. It in case of the ASD method, DB-42.8t in case Load Factor Design, and DB-24.3t in case of Workins Stress Design, and therefore, it could be understood that the ASD method can more active load,i.e.,1.84 times of active load than the of Workins Stress Design and 1.04 time of active load than the case of active Load Factor Design. Therefore, it is considered at home also, studies on the ASD method and model experiments concerning the ASD method should be practised, the speci-fication of the ASD method is composed and actually applied to the building of a bridge so steel materials can be economized and more rational design be done, and to that all civil engineers should give effort.

수입각증후군에 의한 급성 복증 1례

정은욱,지삼룡,이영태,박지훈,김동기,제인수,채두근,박성재,박은택,이연재,이상혁,설상영,정정명 白中央醫療院 2005 仁濟醫學 Vol.26 No.1

Afferent loop syndrome is an uncommon complication of a gastrectomy and Billroth Ⅱ reconstruction. It may cause symtoms at any time from the first postoperative day to many years after the gastrectomy. Afferent loop syndrome is characterized by abdominal pain, vomiting and elevation of serum amylase. Thus, it is difficult to differentiate afferent loop syndrome from other cause of acute pancreatitis. However, the history of gastrectomy can be an important clue for diagnosing afferent loop syndrome. We experienced one case of chronic afferent loop syndrome with acute pancreatitis. After appropriate management, the abdominal pain disappeared and serum amylase level decreased. We report this case with a review of relevant literatures.

적응관측기를 이용한 SPMSM의 속도 및 위치 센서리스 제어

정택기,이정철,이홍균,정동화 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

This paper is proposed to position and speed control of a surface permanent magnet synchronous motor(SPMSM) drive without mechanical sensor. An adaptive state observer is used for the mechanical state estimation of the motor. The observer is developed based on a nonlinear model of the SPMSM, that employs a d-q rotating reference frame attached to the rotor. A adaptive observer is implemented to compute the speed and position feedback signal. The validity of the proposed sensorless scheme is confirmed by various response characteristics.

소아 상완골 외과 골절 치료후 발생한 운반각 변화 : 운반각의 새로운 방사선적 측방 방법에 대하여 The New Radiologic Carrying Angle Measuring Method

박동만,이정윤,김경택,손성근,김성수 대한골절학회 1995 대한골절학회지 Vol.8 No.1

The lateral condyle fracture of humerus in children is the second most common fracture among the elbow fractures. In dealing with this fracture, we have frequently encountered the various complications due to physeal plate and intraarticular involvement. Change of the carrying angle is one of the common complications, but many authors reported different results about the change of carrying angle. Also, it is too difficult to measure the carrying angle during the early stage of the treatment because of cast immobilization, motion limitation of elbow, and wide variations of radiologic carrying angle according to elbow position changes. We performed this study to find the more stable and predictable new radiologic measuring mothod about the carrying angle, and then analysed the factors affecting the changes of carrying angle of the 23 patients of the lateral condyle fractures of the humerus in children who were treated and followed up more than twelve months at the Department of Orthopaedic Surgery, Dong-A University Hospital from May 1990 to April 1993. The results were as follows. 1. Carrying angles by Beals method showed variable values according to the elbow positions, but A-angles by the new measuring method were relatively stable repudless of the elbow positons. 2. Increase of clinical carrying sngle was 3 cases, decrease was 9 cases, and ranges of clinical carrying angle change were from -7 degress to +4 depees. Imease of A-angle was 7 cases, decrease was 4 cases, and ranges of A-angle change were form -10 degrees to +10 degrees. 3. The change of carrying angle showed no correlation with Jacob stage, follow up duratian, metaphyseal height and interval between injury and treatment. But the incidence and the amount of carrying angle change were increased accarding to the inaeaaed age at injury(r=0.62, P$lt;0.01). 4. Tbere were statistical significant correlation(r= -0.65, P$lt;0.01) and regreasion between the change of carrying angle and A-angle: Y -0.99X + 0.56(Y:change of clinical carrying angle, X: A- angle change), (r2=0.42, P$lt;0.01).

경골 천정 골절에 대한 임상적 고찰

박동만,이정윤,김경택,손성근 대한골절학회 1994 대한골절학회지 Vol.7 No.2

A pilon fracture, which is defined as a comminuted intraarticular fracture of distal tibia, involve the articular surface and metaphysis with occasional extension in the diaphysis. The management has been notoriously difficult due to the associated injury, intraarticular fracture, severe communition of distal tibia, joint incongruity and soft tissue trauma. Most authors has reported good results after a surgical treatment by a priociple of AO group treatment. Rescently, Bone et all reports that ROM and outcomes of the severly comminuted or open fractures of the distal intraarticular tibia were very good in using the external fixator. The result of treatment of 22 cases were analysed at the Department of Orthopedic Surgery, Dong-A University hospital from Mar. 1990 to Feb. 1993. The results were as follows; 1. The incidence of pilon fracture is 8.3% of all anlle fracture treated during same period. 2. The most common cause of injury is fall down(63.3%). 3. The most frequent type is type 3 (54.6%).(by Rudei & Allgower) 4. The most common associated injury is compression fracture of spine and calcaneal fracture(4 cases) 5. There are eight cases open Pilon fracture(36.3%) 6. We had treated severe communited fracture and open fracture by using external fixator, we achived good ROM and outcomes. 7. The more accurate reduction, the better clinical result. 8. Complication of the Pilon fracture were traumatic arthritis, non-union, malunion, wound int, etc.

하수방류수의 자외선 살균을 위한 설계인자 최적화에 관한 연구

신동호,김진현,김정민,고승민,모효원,이용택 한국공업화학회 2004 응용화학 Vol.8 No.2

대전·충남지역 와병노인의 실태에 관한 연구

이동배,심운택,이태용,오장균,정성훈 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.1

This study was conducted to investigate the prevalence rate and the relationship between causative diseases and self-help abilities in bed ridden patients of the elderly. The study group was composed of 1.568 peoples aged 65 or more, living in Taejeon city and Chungnam provincial area. The results obtained were as follows : 1. The prevalence rate of bed ridden patients were 5.7% in male, and 4.3% in female. The rates revealed increasing basis with the ages. 2. The prevalence rate was higher in city area with 6.1% than inland and seaside area with 4.3%, 3.7% respectively. 3. The mean age of bed ridden patients were 75.9 years in male. 78. 0 years in female. The rates were variable with residential area. As the cause of bed ridden patients the cerebrovascular disease was higher in urban than rural area. 4. The mean age of causative diseases was the highest in contusion and fracture with 82.8 years. The period of bed ridding was the highest in muscular disease and arthropathy with 60.2 monthes. 5. The average score of activity of daily living was the highest in muscular disease and arthropathy and followed by respiratory disease, other disease, senility, cerebrovascular disease, contusion and fracture with decreasing basis. But most bed ridden patients did the activity of daily living similar to those of normal persons. 6. The causative diseases were diagnosed mainly in general hospital, hospital. and herb medicine. but muscular disease and senility were in self-diagnosed. 7. The helper of bed ridden patients were mainly wives or daughters in law.

DNA 감지를 위한 MOSFET형 전하검출센서의 제작 및 특성

정용택,김동선,류홍근,박혜정,신장규,최평,이종현,임근배 경북대학교 센서기술연구소 2002 센서技術學術大會論文集 Vol.13 No.1

S. cerevisiae와 A. pullulans를 이용한 수용액 중의 납 제거에서 온도와 pH의 영향

김동석,서정호,우형택,송승구 대구효성가톨릭대학교 응용과학연구소 1997 응용과학연구논문집 Vol.6 No.1

The environmental factors, temperature and pH, were controlled to investigate the effects on the removal of lead in the solution by S. cerevisiae and A. pullulans. The range of experimental temperature was 20℃∼50℃, and that of Ph was 2.5∼6.5 and 2.5∼12, respectively. The optimum temperature of S. cerevisiae and A. pullulans in the removal of lead was 30℃ and 40℃, respectively. And the initial removal rate of lead by, S. cerevisiae was increased according to the increase of temperatue. The variation of the amounts of lead removal by S. cerevisiae according to the variation of temperature was steeper that by A. pullulans. The optimum pH condition was existed on both of the microorganisms, S. cerevisiae and A. pullulans, in our experimental range and that is 4.5 and 9.0, respectively.