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Role of accidental torsion in seismic reliability assessment for steel buildings
Heui-Yung Chang,Jung-Yu Chen,Chu-Chieh Jay Lin,Ker-Chun Lin 국제구조공학회 2009 Steel and Composite Structures, An International J Vol.9 No.5
This study investigates the role of accidental torsion in seismic reliability assessment. The analyzed structures are regular 6-story and 20-story steel office buildings. The eccentricity in a floor plan was simulated by shifting the mass from the centroid by 5% of the dimension normal to earthquake shaking. The eccentricity along building heights was replicated by Latin hypercube sampling. The fragilities for immediate occupancy and life safety were evaluated using 0.7% and 2.5% inter-story drift limits. Two limit-state probabilities and the corresponding earthquake intensities were compared. The effect of ignoring accidental torsion and the use of code accidental eccentricity were also assessed. The results show that accidental torsion may influence differently the structural reliability and limit-state PGAs. In terms of structural reliability, significant differences in the probability of failure are obtained depending on whether accidental torsion is considered or not. In terms of limit-state PGAs, accidental torsion does not have a significant effect. In detail, ignoring accidental torsion leads to underestimates in low-rise buildings and at small drift limits. On the other hand, the use of code accidental eccentricity gives conservative estimates, especially in high-rise buildings at small drift limits.
박원규,장재천,이헌주,김홍진,최준혁,구미진 대한간학회 2002 Clinical and Molecular Hepatology(대한간학회지) Vol.8 No.4
Nodular hepatic involvement of multiple myeloma is very rare. We report a case of nodular hepatic involvement of multiple myeloma, mimicking hypervascular hepatocellular carcinoma.(Korean J Hepatol 2002;8:490-494)
박원규,장재천,이헌주,김홍진,최준혁,구미진 대한간학회 2002 Clinical and Molecular Hepatology(대한간학회지) Vol.8 No.3
Intrahepatic biloma is one of the rare complications occurring after transcatheter arterial chemoembolization (TACE). Biloma after TACE may result from the development of peripheral bile duct necrosis caused by microvascular damage of the peribiliary capillary plexus, and intrahepatic ductal stenosis. We report a case of resection of intrahepatic biloma with hepatocellular carcinoma after TACE. (Korean J Hepatol 2002;8:331-335)
Desmoplastic Small Round Cell Tumor: A Case Report
( Joon Hyuk Choi ),( Sung Soo Yun ),( Jay Chun Chang ) 영남대학교 기초/임상의학연구소 2006 Yeungnam University Journal of Medicine Vol.23 No.1
Desmoplastic small round cell tumor (DSRCT) is a rare and highly malignant mesenchymal tumor found in the abdominal cavity. It mainly affects young male patients. We report a case of DSRCT that occurred in the abdominal cavity of a 50-year-old man. The tumor was characterized by small round tumor cells with irregular nests in the prominent desmoplastic stroma. The tumor cells showed immunoreactivity for epithelial membrane antigen, desmin, vimentin, and neuron specific enolase.
간내 비 구역성 관류 이상 중심부, 변연부에 따른 역동성의 차이
신명호 ( Myung Ho Shin ),장재천 ( Jay Chun Chang ),박원규 ( Won Kyu Park ),이헌주 ( Heon Ju Lee ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
<목적> 구역문맥지 폐쇄에 의한 구역성 관류이상과는 달리, 간 변연부의 일시적인 관류증가에 의한 비구역성 관류이상은 화농성 문맥 혈전증, 특발성 문맥고혈압 등의 질환이나, 해면상변형 발생시 변연부문맥계의 측부혈행이 도달하지 못하는 상황에서 동반된다고 하며, 최근 해면상 형성이 발달하기 이전에도 이런 현상이 관찰된다고 보고하고있다. 저자들이 경험한 일시적 간 변연부 관류증강을 보였던 증례들을 정리하여 그 원인질환과 생성 배경을 확인하고 미만성 간질환에 대
박원규(Won Kyu Park),장재천(Jay Chun Chang),이헌주(Heon Zu Lee),최준혁(Joon Hyuk Choi),구미진(Mi Jin Gu) 대한소화기학회 2002 대한소화기학회지 Vol.39 No.2
Plasmacytoma is a neoplastic proliferation of plasma cells and commonly occurs in the bone marrow. However, it may develop in any tissue throughout the body. Extramedullary plasmacytomas constitute 3-5% of all plasma cell neoplasms, and the most common site of these tumors is the upper respiratory tract. Extramedullary plasmacytoma of the omentum is extremely rare. We report a case of extramedullary plasmacytoma of the omentum presented as a huge omental cystic mass on ultrasonogram and CT scans. It was confirmed by immunohistochemical study of the resected specimen. (Korean J Gastroenterol 2002;39:142-145)
Dental arch wires with tooth-like color
Chen, Sinn-Wen,Wu, Hsin-Jay,Liu, Chih-Hao,Chien, Yuan-Chun,Hu, Chih-Chang Techno-Press 2012 Advances in materials research Vol.1 No.1
Unique tooth-like (milky white) color ${\beta}$-Ti dental arch wires are prepared by anodization in a 1M $H_2SO_4$ electrolyte at $30^{\circ}C$ and 30 V for 88 min and 40 s. Aggregates are formed on these surfaces of the anodized wires with tooth-like colors, and the results are different from those of the anodized wires with monochromatic colors which have smooth oxide surfaces. Similar to the monochromatic wires, the composition of the oxide layer is $TiO_{2-x}$ and the x approaches zero at the outer layer. But different from the amorphous structure observed in monochromatic wires, the oxide layers are partially crystallized with an anatase structure. The milky white colors result from the rough and crystalized oxide layers, not by the interference effect as observed in monochromatic wires.
간내 비구역성 관류이상: 동맥강조영상에서 보이는 일시적 간 변연부 관류증가
박원규 ( Won Kyu Park ),장재천 ( Jay Chun Chang ),김재운 ( Jae Woon Kim ) 영남대학교 기초/임상의학연구소 2007 Yeungnam University Journal of Medicine Vol.24 No.2S
Purpose:This study was done to arrange the cases showing temporally hyperperfusion in the periphery of the liver, to check the etiology and mechanism, and to find out the new radiologic role on diffuse liver disease. Materials and Methods:We reviewed 12 cases of showing transient arterial hyperperfusion in the just peripheral portion of the liver on the arterial dominant phase on dynamic CT and the absence of abnormal perfusion between central and peripheral portion on tissue equilibrium phase. We retrospectively analyzed final diagnosis and the presence of main portal vein thrombi, and cavernous transformation. 1) Results:Final diagnosis in 12 cases was as follows: diffuse liver disease was in seven cases, pancreatitis in three and pyogenic portal thrombosis in two. Main portal vein thrombosis were detected all cases of pancreatitis and pyogenic portal thrombosis. In seven diffuse liver disease, two cases shown thrombosed, two cases shown normal and the other cases are collapsed. Cavernous transformation was in three cases of pancreatitis and two of diffuse liver disease. Conclusion:We think that the causes of this phenomenon maybe as follows: the difference of the hemodynamic compensation mechanism between central and peripheral zone of the liver, presence of microscopic thrombi in peripheral portal branch which cannot be detected by imaging technique, hypercoagulability in portal area, the systematic destruction of terminal portal branch and the development of ectopic portal pathway.