고속 4-2 compressor

이성태,김정범 강원대학교 정보통신연구소 2010 정보통신논문지 Vol.14 No.-

4-2 compressor는 곱셈기의 부분 곱 합 트리(partial product summation tree)의 기본적인 구성요소이다. 본 논문은 고속 연산이 가능한 4-2 compressor 구조 두 개를 제안한다. 제안한 첫 번째 회로는 최적화된 XOR-XNOR와 MUX로 구성하였고, 지연시간이 32.2% 감소하였다. 제안한 두 번째 회로는 한 개의 전가산기와 MUX로 구성하여, 6.3%의 전력소모가 감소하였다. 이 두개의 회로는 기존의 회로와 비교하였을 때 회로 구성에 필요한 트랜지스터수가 12개 감소하였다. 제안한 회로들은 Samsung 0.18um CMOS 공정을 이용하여 설계하였으며, HSPICE를 통하여 검증하였다.

토양의 EC 수준에 따른 관비공급 농도가 시설토마토 수량과 토양의 염류집적에 미치는 영향

이성태,김영봉,이영한,이상대 한국환경농학회 2006 한국환경농학회지 Vol.25 No.1

測量用 Eslone Tape의 適正使用法에 관한 硏究

李成泰 건국대학교 1968 學術誌 Vol.9 No.1

In recently Eslone Tape (P.V.C. Coated fiber glass) has been used increasingly in a tool of measuring distance. If we found out fit using method of this tape, we could measure more accurate distance surveying. In order to achieve this purpose, elongation about the same kind of three tape is experimented under the each tension from 1kg to 10 on the 30m Horizontal plane and at the same time sagging is calculated under each tension by selfish load. As a result, considering elongation and sagging to be (+) and (-) error, it is known the right tension as the elongation of the errors.

성인에서 전완부 양골 간부골절의 수술적 치료

이성태,안의환,구자헌 대한골절학회 2001 대한골절학회지 Vol.14 No.2

Purpose : The purpose of this study is to evaluate the effectiveness of operative methods for diaphyseal fractures of both forearm bones in adults. Materials and Methods: Forty five cases with diaphyseal fractures of both forearm bones over 18 year old that are treated by operative methods from January 1994 to December 1998 were followed and analyzed. The most common age group was 3rd and 4th decade(each, 24.4%). Traffic accident was the most common cause of injuries(31.2%). Among both the radius and ulna, middle 1/3 was the most common level of fractures(60%, 57.8%). In operative methods, open redeuction and internal fixation with dynamic compression plate(D.C.P.) and screws were performed in 39 cases, closed reduction and internal fixation with Rush pin were performed in 5 cases, And another 1 case was performed with D.C.P. and Rush pin simultaneously. Results: According to simple X-ray and physical examinations, The average of bone union periods was l2.7 weeks in radius, 13.5 weeks in ulna. The range of bone union periods according to the level of fractures was from 12.4 weeks to 14.1 weeks. For the functional results assessed by Grace and Eversmann method, excellent was 48.9%, good was 35.6%, acceptable was 11.1% and unacceptable was 4.4%. Conclusion: The functional result was satisfactory in 84.5%. So the operative method of diaphyseal fractures of both forearm bones, if proper operative method had been selected and meticulous surgical technique had been performed, was considered as recommendable method.

CO2 저감용 혼합재를 사용한 고인성 콘크리트의 개발

이성태,허형석,노재호 한국구조물진단유지관리공학회 2013 한국구조물진단유지관리공학회 논문집 Vol.17 No.3

1990년대 후반부터 사용된 폴리머 콘크리트로 제작된 맨홀은 이 맨홀이 가지고 있는 다양한 장점 때문에 현재까지 널리 이용되고 있다. 그러나, 고유가 시대로 접어들면서 석유화학 재료의 가격인상과 더불어 폴리머 콘크리트의 제조원가가 상승되고 이에 따른 폴리머 콘크리트의 약점이 대두되고 있다. 따라서, 고가의 폴리머 콘크리트로 제작된 맨홀의 뛰어난 휨강도를 대체할 수 있는 경제적인 시멘트 콘크리트 맨홀의 개발이 요구되어 왔다. 본 연구에서는 비정질 칼슘알루미네이트 (Armorphous calcium aluminate, ACA)계의 속경형 시멘트기술을 기반으로 플라이 애쉬와 고로슬래그, 실리카 퓸, 메타카올린 등의 산업부산물을 이용하여 시멘트의 사용량을 최소화시킴으로써 CO2를 저감시킬 수 있는 친환경적인 맨홀용 고인성 콘크리트를 개발하고자 하였다. 연구결과, 경제적이고 친환경적이면서도 요구성능을 만족시키는 시멘트 콘크리트 맨홀을 개발하였다. Now-a-days, a manhole adopted since the late 1990s and produced using the polymer concrete has widely used due to the various benefits. While entering the High oil prices times, however, and with the price increase of the petrochemical materials, the cost of manufacture of polymer concrete was elevated and the resulting polymer concrete's weakness is being put on. Accordingly, the development of economic cement concrete manholes, which can replace the outstanding bending strength of manhole made of high-price polymer concrete, has been required. In this study, based on the cement technology of fast hardening armorphous calcium aluminate (ACA), by minimizing the amount of cement using the industrial byproducts, to develop the eco-friendly high-toughness concrete manhole, which can reduce CO2 reduction, was intended. As the results, the cement concrete manhole, which economic, eco-friend, and meeting the performance requirements, was developed.

척추결핵의 KANEDA기구를 이용한 전방융합술 : Cases Report

이성태,장석정,안태형,도성신,신호 대한신경외과학회 1989 Journal of Korean neurosurgical society Vol.18 No.6

We reported 2 cases of tuberculous spondylitis and its treatment was improved with anterior interbody fusion by a KANEDA instrument. The patients were early ambulation without any complications and sequalaes.

Automatic Level C3의 測定誤差에 對한 硏究

李成泰 建國大學校附設 農業資源開發硏究所 1975 論文集 Vol.1 No.-

A Study of Measuring Errors of Automatic Level C3 Recently the uses of automatic level is popular because of its handy operation and its comparatively being of better function. This study is to find out the measurement error and the accuracy in the experiment with the automatic level C3. The results are summarized as follows; 1. The air bubble in the circular level has to be within the red circle on glass and at least touched internally to the line. 2. When the same leveling rod is measured and observed considerably long period, the collimation error is approximately of 4" resolving power of the telescope and proportional to the collimation distance. 3. In case of Common leveling once setting error is proportional to the collimation distance and the accuracy of the Automatic level Compensator is 2-9" 4. The error of closure in leveling is getting smaller as the collimation distance is getting shorter. 5. If the collimation distance is within 60m, the error of closure is less than 10 √Lmm, which is the allowable limit of the second order leveling in Korea. 6. The level used in this experiment was belong to 3rd class.

회계사무를 합리적으로 운영하는 방안 - 관계법규를 엄수해야한다

이성태 대한지방행정공제회 1959 地方行政 Vol.8 No.70

N/A N/A

사과에 대한 패화석의 시용 효과

이성태,이영한,최용조,손길만,조주식,허종수 한국토양비료학회 2001 한국토양비료학회 학술발표회 Vol.2001 No.-

진공함침을 이용한 철근콘크리트 부재에서의 보강공법 개발

이성태,송영선 한국구조물진단유지관리공학회 2012 한국구조물진단유지관리공학회 논문집 Vol.16 No.5

철근콘크리트 구조물은 시간의 흐름과 환경의 변화에 의하여 노후화 및 부실화가 진행된다. 따라서 강도와 사용성이 저하되고, 결국에는 구조물 수명의 단축은 물론, 안전성도 줄어든다. 따라서 본 연구에서는 성능저하로 안전성이 떨어진 구조물의 내하력을 증진시키고, 기존 공법보다 내구성을 향상시켜서 구조물의 수명을 증가시키는 보강공법을 개발하고자 하였다. 이를 위해 보강재 양을 쉽게 조절할 수 있고 기존 콘크리트 구조물과 보강재를 일체화시킴으로서 하중재하 시에 보강재와 기존 콘크리트가 같이 거동할 수 있도록 진공함침을 이용하는 보강공법을 개발하였다. 휨 실험의 경우, 진공함침으로 2겹에 해당하는 보강, 섬유시트 2겹 보강, 진공함침으로 1겹 에 해당하는 보강, 섬유시트 1겹 보강, 무보강한 실험체의 순으로 최대강도를 보였다. 또한, 섬유보강재가 열악한 환경에 노출되었을 때의 내구성에 대한 확인결과, 모든 환경에 대한 잔류 인장강도가 90% 이상을 상회하였다. 이는 본 연구에 사용된 섬유보강재가 열악한 환경에 대해 저항성이 우수하기 때문으로 판단된다. Deterioration and weakening is advanced in compliance with flowing of time and the change of environment in RC structures. Consequently, strength and serviceability decreases, finally, the life of infrastructure shortens and safety characteristics decreases. Accordingly, in this study, a new method to develop a strengthening method using the vacuum impregnation, which increases durability of the infrastructure occurred the safety reduction due to the performance degradation and increases the life of infrastructure by improving the durability compared to the existing method, was planned. For flexural tests, the maximum strength was a low-end order from high order as follows: (1) vacuum impregnation with 2 fold reinforcement, (2) fiber sheet 2 fold reinforcement, (3) vacuum impregnation with 1 fold reinforcement, (4) fiber sheet 1 fold reinforcement, and (5) nothing. Also, for confirmation results about durability, when the fiber reinforcement is being exposed to the inferior environment, the remaining tensile strength exceeded of 90% or more for all environments. This is because the reinforcement used in this research shows the excellent resistance in severe environment.