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논문 : Top-Down 공법이 적용된 흙막이벽의 역해석을 이용한 거동분석
홍원표 ( Won Pyo Hong ),강철중 ( Chul Joong Kang ),윤중만 ( Jung Mann Yun ) 대한지질공학회 2012 지질공학 Vol.22 No.1
본 연구에서는 흙막이벽 설계시 널리 사용되고 있는 SUNEX 프로그램을 이용하여 Top-Down 공법이 적용된 지중연 속벽, 주열식 흙막이벽 (CIP벽, SCW벽)의 변형거동을 분석하였다. 해석프로그램에 Rankine의 토압(l857), Terzaghi and Peck의 토압(1967), Tschebotarioff의 토압(1973), 홍원표·윤중만의 토압(1995a)을 적용하여 흙막이벽의 수평변위를 예측하였다. 프로그램 해석결과, 흙막이벽의 수평변위량은 토압의 종류에 따라 큰 차이를 나타내고 있다. 홍원표·윤중만의 토압(I995a)을 적용하여 얻은 흙막이벽의 예측수평변위량이 실측수평변위량과 가장 유사하게 나타났다. 따라서 프로 그램 해석시 홍원표·윤중만의 경험토압(l995a)을 적용하면, Top-Down 공법이 적용된 흙막이벽의 변형거동을 비교적 정확히 예측할 수 있다. Abstract: The behaviors of a diaphragm wall and a contiguous pile wall such as CIP (Case-in-place pile) and SCW (Soil-cement wall), applied to the top-down construction method, were analyzed using the SUNEX program, which is widely used to design earth retaining walls. Four types of earth pressures, as described by Rankine (1857), Terzaghi and Peck (1967), Tchbotarioff (1973), and Hong and Yun (1995a), were applied to the analysis program to predict the lateral displacement of walls, The results show that the displacements of an earth retaining walls vary with the applied earth pressure. The predicted lateral displacement based on Hong & Yun`s (1995a) earth pressure is similar to the measured displacement. Therefore, the actual lateral displacement of an earth retaining wall, as applied to top-down construction method, can be accurately predicted by using an analysis program considering Hong and Yun`s (1995a) earth pressure.
Top-Down 공법이 적용된 지중연속벽의 설계시 측방토압의 적합성 평가
홍원표(Hong Won-Pyo),강철중(Kang Chul-Joong),윤중만(Yun Jung-Mann) 한국토목섬유학회 2012 한국지반신소재학회 논문집 Vol.11 No.1
본 연구에서는 지중연속벽 설계시 사용되는 범용 해석프로그램에 Rankin(1857)의 이론토압과 홍원표와 윤중만(1995a)의 경험 토압을 각각 적용하여 Top-Down 공법에 적용된 지중연속벽의 수평변위를 분석하였다. 그리고 이들 해석 프로그램에서 산정된 예측변위량과 지중경사계로 측정된 실측변위량을 비교 검토하였다. 현재 지중연속벽 설계에 적용되는 해석프로그램에는 Rankine의 토압이 주로 적용되고 있다. 검토결과, 지중연속벽의 예측수평변위는 적용되는 토압에 따라 상당히 큰 차이를 나타내고 있다. Rankine의 토압을 적용하여 산정된 예측수평변위 형상은 실측결과와 큰 차이를 보이고 있으며 벽체의 하부에서 예측치가 실측치보다 과다하게 산정되었다. 반면, 홍원표·윤중만의 토압을 적용하여 얻은 예측수평변위 형상과 최대수평변위 량은 실측결과와 유사하게 나타났다. 따라서 Top-Down 공법이 적용된 지중연속벽의 설계시 Rankine의 토압보다는 홍원표·윤중만의 경험토압을 적용하는 것이 적합함을 알 수 있다. The Rankine(1857)'s earth pressure and the Hong and Yun(1995a)'s earth pressure was applied to analyze the lateral displacement of diaphragm wall applied to the Top-Down construction method using the computer program, which is a common design program for diaphragm wall. The lateral displacement estimated by the computer program was compared with the lateral displacement measured by inclinometer. The Rankine's earth pressure has been widely used to design the diaphragm wall in the analysis of computer program. As the result of comparison, the lateral displacement of diaphragm wall was predicted differently according to the applied earth pressures. The behavior of lateral displacement predicted by the Rankine's earth pressure was different with displacement measured by inclinometer and the lateral displacement at the bottom part was overestimated. However, the lateral displacement predicted by the Hong and Yun's earth pressure is similar to the behavior and maximum value of real displacement. Therefore, the Hong and Yun's earth pressure is more suitable than the Rankine' earth pressure to design the diaphragm walls applied to the Top-Down Construction Method.
성연중,한치근 慶熙大學校 1997 論文集 Vol.26 No.-
In this paper, we consider a graph partition problem, in which we partition the vertices of the graph into 2 parts and minimize the sum of costs of edges that connect two parts. We use Kernighan's heuristic method based on a local search method for solving the problem, In order to increase the possibility of finding the global optimum, we apply smoothing techniques to the heuristic method and propose two smoothing algorithms. Also, we propose an algorithm for obtaining an initial solution and using the initial solution, we can get a minimum solution that is not worse than solutions that can be obtained using many random initial solutions. Through the computational experiments, we demonstrate the proposed methods are better than the existing method for the graph partition problem.
平行 結合 마이크로스트립 線路를 利用한 帶域通過필터에 關한 硏究
尹義重,李潤鉉 한국항공대학교 1990 論文集 Vol.28 No.-
This paper discribes on parallel coupled microstrip band pass filter synthesis procedure. Exact analysis of parallel coupled microstrip line structure, that is this proportionately is then performed by evaluationg the transmission coefficient as a function of frequency with the aid of a computer. The wide about 50% pass bandwidth could be obtained for a microstrip band pass filter of 4 and 6 [GHz] center frequency using the parallel coupled microstrip transmission line. A method for filter synthesis was proposed and correlation between analytical and computer simulation results showed good agreement for parallel coupled microstrip line structure.
치과용 디지털 색상 분석용 기기의 정확성과 재현 능력에 대한 평가
정중재,박수정,조현구,황윤찬,오원만,황인남 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.4
본 연구에서는 치과용 디지털 색상 분석기기 중 하나인 ShadeScan (CYNOVAD, Montreal, Canada)의 색상 분석의 정확성과 재현 능력을 평가하였다. 균일한 치아 배열을 가진 20대 성인 남자 8명과 여자 8명의 상악 인상을 고무인 상제 (Exaflex, GC, Japan)를 이용하여 채득하고, 인상에 A2 색상의 임시 크라운 제작용 자가중합형 레진을 주입하여 치아 모델을 완성하고, ShadeScan을 이용해 각 치아의 영상을 얻어 컴퓨터의 ShadeScan 프로그램으로 분석하였다. 그리고 측정 결과의 재현 능력를 평가하기 위해 2개의 치아 모델을 임의로 선택하여 각 치아마다 10회의 색상 측정을 시행하여 분석 결과를 비교하였다. 또한 분석된 영상의 동일 shade 간의 색차를 확인하기 위해 광중합 복합레진인 Gradia Direct (GC, Tokyo, Japan)와 shade guide의 CIE L^(*)a^(*)b^(*) 값을 백색과 흑색 배경판 상에서 spectrophotometer (Spectrolino, GretagMacbeth, USA)로 측정하고, ShadeScan에 의해 동일한 shade로 분석된 shade guide간의 색차를 계산하여 다음의 결과를 얻었다. 모든 치아에서 모델 제작 재료와 동일한 A2 색상므로 분석된 경우는 없었으며, 개개의 치아에서 전체 순면이 동일한 색상으로 분석된 예는 없었다. 또한 동일한 치아군에서 치아의 크기 , 형태 , 순면의 굴곡 등에 따라 서로 다른 색상 분포를 보였다. 재현성 평가에서 각 치아의 중앙부는 비교적 일정한 재현성출 보였으나, 절단부와 주변 부위는 재현성이 낮았으며, 동일한 shade로 분석된 shade guide 간에는 3 이상의 색차 (ΔE^(*))를 보였다. 이상의 결과는 치과용 디지털 색상 분석기기는 비록 높은 재현 능력은 가지고 있지만 정확성에 오류가 있음을 시사하며 , 따라서 이러한 기기를 이용한 색상 분석 시 좀 더 세밀한 주의와 다른 방법의 추가 사용이 필요하리라 사료된다. This study was done to evaluate the reliability of the digital color analysis system (ShadeScan, CYNOVAD, Montreal, Canada) for dentistry. Sixteen tooth models were made by injecting the A2 shade chemical cured resin for temporary crown into the impression acquired from 16 adults. Surfaces of the model teeth were polished with resin polishing cloth. The window of the ShadeScan handpiece was placed on the labial surface of tooth and tooth images were captured, and each tooth shade was analyzed with the ShadeScan software. Captured images were selected in groups, and compared one another. Two models were selected to evaluate repeatability of ShadeScan, and shade analysis was performed 10 times for each tooth. And, to ascertain the color difference of same shade code analyzed by ShadeScan, CIE L^(*)a^(*)b^(*)values of shade guide of Gradia Direct (GC, Tokyo, Japan) were measured on the white and black background using the Spectrolino (GretagMacbeth, USA), and Shade map of each shade guide was captured using the ShadeScan. There were no teeth that were analyzed as A2 shade and unique shade. And shade mapping analyses of the same tooth revealed similar shade and distribution except incisal third. Color difference (ΔE^(*)) among the Shade map which analyzed as same shade by ShadeScan were above 3. Within the limits of this study, digital color analysis instrument for dentistry has relatively high repeatability, but has controversial in accuracy.
박윤자,한광래,고한중 전주교육대학교 과학교육연구소 2001 科學 敎育 硏究 論文集 Vol.23 No.1
The enhancement of inquiry skills has been emphasized as a important objective of science education for a long time.Of these, the observation is not only a simple and basic skill but also a very important skill, in aspect of gathering informations about the nature of all things around us, through interaction between the sense organs of body and objectives. The purpose of this study is to analyze the results of observations about the leaf of Camellia made by the elementary student.from the 3rd to the 6th grade, and to make use of them as the basic materials for the observative learning and the evaluation of the observation ability.As the results of this study, a total number of observation items is 75 ( 59 using the sight sense, 10 using the tactile sense, 5 using the olfactory sense, 1 using the auditory sense and 0 using the palate sense).Generally, most of students have observations the sight and the tactile sense.As the grade ascends, the observations with operation is increased, also the quantitative expression and Interpretation about them is increased.Occasionally, the interpretations on the observative (acts made by student are inaccurate.
一部 大學生들의 性에 對한 認識,態度 및 性經驗에 關한 調査硏究
金周姸,尹太永,崔重明,朴淳永,柳東俊 慶熙大學校 1993 論文集 Vol.22 No.-
For one month from September 24, 1992, the knowledge, attitude and experience toward sex of K University student were investigated, and the results were as follows. 1. The time that majority of subjects began to be interested in sex was at the 5th to 6th grade of primary school (22.8%). The case that had troubles about sex was 77.9% of all subjects and this reveals that sex is an important issue of adolescent period. The method to resolve their sexual desire were reading books (12.2%), masturbation (10.2%) and suppression (10%). They got information of sex from magazines (37.4%), friends (21.6%) and they counselled the issue of sex with their friends (65.6%). 2. Almost all of the subjects (98.3%) talked about marriage and love at school and were interested in making friends of opposite sex. 88.4% of subjects had an experience of having friends of opposite sex and 45.3% of subjects thought them as friends. 78.1% of parents were affirmative to their children´s making friends with opposite sex. 3. Only 35.6% of subjects thought that pre-marriage virginity should be kept, and there was difference of concept between males (28.3%) and females (50.6%) (p<0.001). 4. The experience of msturbation was 63.5% and there was large difference between both sexes (male: 88.4%, female: 12.8%). The subjects that had not experienced kiss were 50.4% of total. The subjects that had not experienced sexual intercourse were 68.3% of total, and there were statistically significant difference between both sexes(male: 56.3%, female: 93%).
선택적 신동맥 색전술을 이용한 신절석술 후의 신출혈 치료 1례
이중화,이보배,윤능수,임승수,박청희 충남대학교 의과대학 지역사회의학연구소 1985 충남의대잡지 Vol.12 No.2
A patient with uncontrollable postoperative renal hemorrhage was successfully treated by selective injection of gelfoam into the anterior inferior segmental branch of right renal artery. Follow up arteriography was done 16 days later. It revealed persistent occlusion of the bleeding vessels. This method is a simple effective procedure in cases of renal hemorrhage to diverse etiology without responsive management.