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국부좌굴과 뒤틀림좌굴이 발생하는 종방향 보강재로 보강된 강판의 압축강도
박호상,서상정,권영봉,Park, Ho-Sang,Seo, Sang-Jung,Kwon, Young-Bong 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.3
This paper describes an experimental research on the structural behavior and the ultimate strength of longitudinally stiffened plates subjected to local, distortional, or mixed-mode buckling under compression. The stiffened plate undergoes local, distortional, or interactive local-distortional buckling according to the flexural rigidity of the plate's longitudinal stiffeners and the width-thickness ratios of the sub-panels of the stiffened plate. A significant post-buckling strength in the local and distortional modes affects the ultimate strength of the longitudinally stiffened plate. Compression tests were conducted on stiffened plates that were fabricated from 4mm-thick SM400 steel plates with a nominal yield stress of 235MPa. A simple strength formula for the Direct Strength Method based on the test results was proposed. This paper proves that the Direct Strength Method can properly predict the ultimate strength of stiffened plates when the local buckling and distortional buckling occur simultaneously or nearly simultaneously. 본 논문에는 압축력을 받는 국부좌굴, 뒤틀림좌굴 및 두 좌굴의 혼합좌굴이 발생하는 종방향 보강재가 부착된 강판의 거동 및 극한 강도에 대한 실험적인 연구를 서술하였다. 압축력을 받는 보강판의 경우 서브패널의 폭-두께비와 보강재의 휨강성에 따라서 국부좌굴, 뒤틀림좌굴 또는 두 좌굴의 혼합형태의 좌굴이 발생하게 되고, 상당한 크기의 후좌굴강도가 발현되어 보강판의 극한강도를 지배하게 된다. 보강재의 휨강성과 보강재로 구분된 서브패널의 폭-두께비가 다른 두께 4.0mm, 공칭항복강도 235MP인 SM400 강판으로 제작된 보강판의 중심압축실험을 수행하고 유한요소해석결과와 비교하여 검증하였다. 실험 결과에 근거하여 보강판의 극한강도를 예측할 수 있는 직접강도법을 적용한 설계압축강도식을 제안하였다. 제안된 직접강도법은 뒤틀림좌굴 또는 국부좌굴과 뒤틀림좌굴이 혼합하여 발생하는 종방향 보강재로 보강된 강판의 극한강도를 적절하게 예측할 수 있는 것으로 판단되었다.
김창길(Chang Gil Kim),김호상(Ho Sang Kim),서장우(Jang Woo Seo),정금철(Geum Chul Jung) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
This study describes the optimum size of a reef set in Korean coastal waters. Data were analyzed in relation to the weight and variety of fish species caught with a three-layer gill net. The results did not indicate a significant difference in the mean catch and mean number of fish species among the three different reef sets, 800, 1,600 and 2400 ㎥.
김창길(Chang Gil Kim),김호상(Ho Sang Kim),서장우(Jang Woo Seo),김두봉(Doo Bong Kim) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
This study describes the postinstallation maintenance technology of artificial reefs and their improvement. The maintenance technology of artificial reefs consists of four steps; the investigation of volumes of installed reefs, the removal of fishing gears entangled in reefs, the estimation of reef functions, and the establishment of surveyed results in the data base. The proper understandings of their steps is the key to improve the maintenance technology of artificial reefs.
정진용 ( Jin Yong Jung ),임선영 ( Sun Young Yim ),김창하 ( Chang Ha Kim ),김진동 ( Jin Dong Kim ),서연석 ( Yeon Seok Seo ),임형준 ( Hyung Joon Yim ),류호상 ( Ho Sang Ryu ),김민주 ( Min Ju Kim ),박범진 ( Beom Jin Park ),엄순호 ( So 대한간암학회 2012 대한간암학회지 Vol.12 No.1
Tumor size is one of the most important factors for decision of therapeutic plan and prognosis of hepatocellular carcinoma (HCC). If the diagnosis of HCC is made earlier in its small size, the prognosis is better. However the diagnosis of small HCC is not easy because small HCC lacks the typical clinical and radiologic feature. We experienced two cases of small HCC less than 1 cm that was confirmed after first treatment.
손호상,서성모 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.1
KR desulphurization facilities has been adopted to Steelmaking Plant I in Pohang Works, POSCO since 1976. However, it has been more important than ever to improve desulphurization efficiency with increasing demand of high-quality steel. Therefore, water model and plant scale experiments were conducted to improve desulphurization efficiency in KR equipment by inserting a certain baffle on ladle bottom or wall. By the application of a baffle on ladle bottom or wall, the perfect mixing time was decreased to 20-42% and higher disperse and penetrating degree of particles were observed by giving turbulence to helical flow of fluid compared with that of the conventional condition. The plant scale equipment experiments show that using a certain baffle on ladle bottom or wall increase desulphurization efficiency in KR.
이상우,김윤환,이재원,박미라,이성준,이구,김창덕,최재현,엄순호,류호상,전훈재,송치욱,현진해,진윤태,김광희,서성옥 대한소화기학회 1999 대한소화기학회지 Vol.32 No.6
Background/Aims: Recent progress in both diagnostic and therapeutic technique of hepatocellular carcinoma (HCC) appears to improve the prognosis. The purpose of this study was to evaluate the prognosis of HCC in relation to treament methods. Methods: A new staging scheme (PI stage) based on the prognostic index was used. A total of 487 patients with HCC were divided into 4 treatmen groups; no treatment (No Tx), transarterial oily chemoembolization (TOCE), combination of percuta neous ethanol injection and TOCE (CEI), partial hepatectomy (OP). Results: In PI stage I, the groups of CEI and OP showed similar survival rates, and both prolonged survival compared with the group of TOCE. In PI stage II, CEI gave a better survival than TOCE, whereas OP could not improve survival rate, compared with TOCE. In PI stage III, only TOCE was done in some patients and i prolonged survival, particularly when serum bilirubin was 1.5 mg/dL or less. Conclusions: In the P stage I, operation is recommended firstly, but if operation is impossible, CEI could be selected. CE may be chosen as the first treatment choice in PI stage II. In PI stage III, TOCE may be considered for patients whose serum bilirubin is 1.5 mg/dL or less.
이상우,김윤환,이재원,김경수,박미라,박동규,이성준,이구,김광희,김창덕,최재현,류호상,전훈재,송치욱,서성옥,엄숭호,현진해,진윤태 대한간학회 1998 Clinical and Molecular Hepatology(대한간학회지) Vol.4 No.4
Background/ Aims : Cases of small hepatocellular carcinoma (HCC) have been increasing with the progress of diagnostic methods . In t his study the screening methods for early diagnos is of HCC were re-evaluated, and comparative ther apeutic analyses were perfomed. Methods : A total of 110 pat ients with small HCC ($lt; 5 cm and $lt; 4 nodules ) were retrospectively analyzed. The patients were divided into four treatment groups ; unt reated group (No T x, n=12), transarterial-oily-chemoembolization group (TOCE, n=43), combined treatment group of percutaneous ethanol injection and TOCE (CEI, n=22), OP group ( OP, n=33). Results : Small HCC occupied 22.6% of t ot al HCC cases . Only one thir d of small HCC cases were detected during the regular screening. In this group, Alpha- fet oprotein as say pr ovided a diagnostic clue in 50% of cases, ultras onography in 71%, and the combination of both in 88%. Five year s ur vival rat e and 5- year non- recurrence rate in small HCC was 29% and 37% respectively. Comparative ther apeutic analys es showed t hat CEI and OP gave a bet t er s ur vival t han T OCE in Child gr ade A. CEI prolonged survival in Child grade B wher eas TOCE did not . Only TOCE was tried and did not improve the survival in Child grade C. Conclus i on : 1) A more strict screening is needed in high risk group of HCC. 2) As a first line of treatment in small HCC, OP or CEI can be selected in Child grade A, and CEI in Child grade B. In Child grade C, a less invasive treatment (PEIT , microwave coagulat ion therapy) should be investigated. (Korean J Hepatol 1998;4:365 380)