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.

Growth Inhibition of Colon Cancer through Inactivation of STAT3 Pathway by IL-10 and IL-1ra Released from Murine Macrophage

Jin Tae Hong, Dohee Won1, Mi Hee Park, Sun Mi Kown, Miran Jo, Sang-Yoon Nam, Beom Jun Lee, Young Won Yun, Ki-Wan Oh, Sang Bae Han 충북대학교 동물의학연구소 2011 Journal of Biomedical and Translational Research Vol.12 No.4

The objective of this study was to determine the effect of macrophages on growth of human colon cancer cells. The results showed that co-culture of colon cancer cells with macrophages inhibited the growth of colon cancer cells (HCT116 and SW620) depending on the number of macrophages, RAW 264.7 cells, and activated THP-1 cells accompanied by down regulation of pSTAT3 in cancer cells. We also found that expression and release of cancer cell growth inhibitory cytokines, IL-1 receptor antagonist (IL-1ra) and IL-10, was increased in macrophages. Blocking of the STAT3 pathway with specific inhibitor and siRNA of STAT3 abolished the growth of colon cancer cells and expression of IL-1ra and IL-10. In addition, neutralization of IL-1ra and IL-10 with antibodies resulted in reversal of macrophage-induced inhibition of cancer cell growth. These data showed that IL-1ra and IL-10 released from macrophages inhibit growth of colon cancer cells through inhibition of the STAT3 pathway

800㎿급 발전소 복수기의 최적 운전점 및 운전방법에 대한 연구

장철호(Cheol-Ho Jang),홍은기(Eun-Kee Hong),황광원(Kwang-Won Hwang),윤린(Rin Yun) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5

Along with the recent construction of a 800㎿ thermal power plant it is necessary to check the soundness of the current operation of the condenser, and to investigate the effects of vacuum level of it on the turbine efficiency for the power plant. In this study, the performances of the condenser and the turbine for the 800㎿ thermal power plant were tested based on the ASME PTC 6 and ASME PTC 12.2 with the variation of the vacuum level. When the condenser vacuum levels were 719.91 ㎜Hg, 724.5 ㎜Hg, and 729.6 ㎜Hg, the turbine efficiencies were 47.36%, 47.47%, and 47.55%, respectively. From the regression analysis of the present data, it was estimated that the optimal vacuum point is between 729 ㎜Hg and 731 ㎜Hg. When this optimal point is to be applied to the condenser, the profit of 5.5 billion won/year is expected based on the '09 caloric cost.

Chronological Role of the Soil Research in Korea - Analysis of Research Reports on Soil from 1906 to 2012 -

Yun, Sun-Gang,Kwon, Soon-Ik,Hong, Seung-Chang,Kim, Min-Kyeong,Chae, Mi-Jin,Park, Chan-Won,Jung, Goo-Bok 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.5

Research reports on soil during the years from 1906 to 2012 have been analyzed to understand the role and pattern of soil research in agriculture. The number of research reports in relation with the key word of soils were 2,211 cases and classified in accordance with the criteria of research area, research subject, and research place of report papers. During the 40 years from 1906 to 1946, research work on soil chemistry was reached 62%, highest in the research area. In the case of research subject, research reports on soil fertility and soil nutrients was highest as 42.2%, and the next subject on soil salt and desalinization was about 19.5%. Research places were in the order of paddy as 34.1%, upland as 23.7%, and reclaimed soil as 22.5%. From 1953 to 2012 during 60 years, in the research area report papers were mainly concentrated on chemistry area as 32% and the next was physics as 26%, and environment as 12%. In the case of research subject during the same period, nutrient management report was reached 21.1%, and soil improvement on chemical and physical properties for optimum crop growth was 11.9%. Soil survey and data base establishment report was 8.6%. Research place were in the order of upland as 34.9%, paddy as 25.7%, and vinyl house as 12.5%, which showed reversed pattern compared to that of before 40 years.

Magnetism and Magnetocrystalline Anisotropy at fcc Fe (001) Surface

Won Seok Yun,Gi-Beom Cha,Soon Cheol Hong 한국자기학회 2008 Journal of Magnetics Vol.13 No.4

The size and surface effects on the magnetism of a fcc Fe (001) surface was investigated by performing firstprinciples calculations on 3, 5, 7, and 9 monolayers fcc Fe (001) single slabs with two different two-dimensional lattice constants, a = 3.44 A (System Ⅰ) and 3.65 A (System Ⅱ), using the all-electron full-potential linearized augmented plane wave method within a generalized gradient approximation. The surface layers were coupled ferromagnetically to the subsurface layer in both systems. However, the magnetism of the inner layers was quite different from each other. While all the inner layers of System Ⅱ were ferromagnetically coupled in the same way as the surface layer, the inner layers of System I showed a peculiar magnetism, bilayer antiferromagnetism. The calculated spin magnetic moments per Fe atom were approximately 2.7 and 2.9 μB at the surface for Systems Ⅰ and Ⅱ, respectively, due to the almost occupied Fe d-state being in the majority spin state and band narrowing. The spin orientations of System I were out-of-plane regardless of its thickness, whereas the orientation of System Ⅱ changed from out-of-plane to in-plane with increasing thickness.

Two New Isoflavone Glycosides from the Extracts of the Fungus Monascus pilosus-Fermented Black Soybean

Hong, Seong Su,Choi, Yun-Hyeok,Lee, Jung A,Ahn, Eun-Kyung,Suh, Joo-Won,Oh, Joa Sub Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.12

Pneumomediastinum, Subcutaneous Emphysema and Pneumoretroperitoneum Secondary to Colonoscopic Perforation in the Absence of Pneumoperitoneum

( Yun Won Jo ),( Seung Suk Yoo ),( Sung Soo Kim ),( Jeong Mi Lee ),( Hyun Ju Min ),( Chang Yoon Ha ),( Hong Jun Kim ),( Woon Tae Jung ),( Ok Jae Lee ),( Hyun Jin Kim ) 대한내과학회 2011 대한내과학회 추계학술대회 Vol.2011 No.1

Colonoscopic polypectomy is a commonly performed procedure in Korea, subsequently prevents colon cancer. The increase of therapeutic colonoscopy, polypectomy, results in inevitably various complications including bowel perforation that is rare and requires emergent decision of treatment modalities and timely treatment. The bowel perforation is usually diagnosed on the basis of pneumoperitoneum on simple X-ray images. Surgery is the treatment of choice for most cases of colonic perforation. A 58-year-old woman was referred to the gastroenterologist for endoscopic mucosal resection (EMR) of laterally spreading flat adenoma in the sigmoid colon. The EMR was performed with flexible and insulated tip knives. The patient was hospitalized for close observation of post-EMR complications. On the day of the polypectomy, simple X-ray images were taken to rule out colonic perforation, which revealed a large amount of intracolonic gas, but no free air in the subphrenic area. The next day of the procedure, subcutaneous emphysema was observed by the clinicians. Then abdomen computed tomography (CT) scan was performed, which showed diffuse bilateral retroperitoneal air extending to the mediastinum without intraperitoneal gas. The patient was discharged from the hospital after medical treatment and supportive care. We herein report a case of colonoscopic perforation in which pneumomediastinum, subcutaneous emphysema and peumoretroperitoneum occurred in the absence of pneumoperitoneum. The perforation was successfully treated with medical treatment and endoscopic clipping. Colonoscopists should not exclude colonic perforation even though free air on simple X-ray images is not visible.

LC : Prediction of Liver-Related Events Using Transient Elastography in Patients with Chronic Liver Disease

( Yun Nah Lee ),( Young Seok Kim ),( Sang Gyune Kim ),( Sae Hwan Lee ),( Soung Won Jeong ),( Jae Young Jang ),( Hong Soo Kim ),( Boo Sung Kim ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1

Background and Aims: Transient elastography (TE) by Fibroscan is a noninvasive method for the diagnosis of liver fi- brosis, but the effi cacy for prediction of clinical decompensation in patients with chronic liver disease (CLD) is uncertain. The aim of this study was to evaluate the efficacy of TE for predicting development of liver related events (LRE) in patients with chronic liver disease. Methods: Between August 2008 and December 2010, 104 CLD patients who underwent TE and liver biopsy before antiviral therapy or portal pressure modifying treatment were enrolled, retrospectively. Patients were evaluated to develop LRE for at least 2 years or until they experienced LRE. Results: During the median follow-up period [median 33.0 (9.0-60.0) months], total 16 LREs developed in 12 (11.5%) patients. TE [P=0.047; odds ratio (OR), 1.064; 95% confidence interval (CI), 1.001-1.130] and ALT [P=0.024 OR, 1.011; 95% CI, 1.001-1.020] were identified as independent predictor for development of LREs by multivariate analysis. The AUROC of TE for predicting the occurrence of LRE was 0.823 and sensitivity and specificity were 75% and 87%, respectively (P<0.001). When patients were divided in two groups according to optimal TE value below or above 15.6 kPa, probability of remaining free of first LRE was significantly higher in group with below 15.6 kPa (P<0.001). Conclusion: TE is effective tool to predict development of LREs in patients with CLD. Therefore, TE is considered to be a valuable clinical tool to avoid invasive procedures

Fundamental magnetic and elastic properties of Fe-Si alloys

Won Seok Yun,Jee Yong Lee,In Gee Kim,Soon Cheol Hong,Jae Il Lee 한국자기학회 2011 한국자기학회 학술연구발표회 논문개요집 Vol.2011 No.12