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Takuji Yamagami,Rika Yoshimatsu,Hiroshi Miura,Tomohiro Matsumoto,Terumitsu Hasebe 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.3
Objective: To determine the safety and usefulness of a two-tiered approach to balloon-occluded retrograde transvenous obliteration (B-RTO) as a treatment for large gastric varices after portal hypertension. Materials and Methods: 50 patients were studied who underwent B-RTO for gastric varices between October 2004 and October 2011 in our institution. The B-RTO procedure was performed from the right femoral vein and the B-RTO catheter was retained until the following morning. Distribution of sclerotic agents in the gastric varices on fluoroscopy was evaluated in all patients on days 1 and 2. When distribution of sclerotic agents in the gastric varices on day 1 had been none or very scanty even though the volume of the sclerotic agent infused was above the acceptable level, a second infusion was administered on day 2. When distribution was satisfactory, the B-RTO catheter was removed. Results: In 8 (16%) patients, little or no sclerotic agent infused on day 1 was distributed in the gastric varices. However, on day 2, sclerotic agents were distributed in all gastric varices. Mean volume of ethanolamine oleate-iopamidol infused on day 1 was 24.6 mL and was 19.4 mL on day 2. Gastric varices were well obliterated with no recurrence. Complications caused by the sclerotic agent such as pulmonary edema or renal insufficiencies were not seen. Conclusion: When gastric varices are very large, a strategy involving thrombosis of only the drainage vein on the first day followed by infusing the sclerotic agent on the following day might be effective and feasible.
A Proposal of Wheel/Rail Contact Model for Friction Control
Kosuke Matsumoto,Yoshihiro Suda,Hisanao Komine,Takuji Nakai,Masao Tomeoka,Kunihito Shimizu,Masuhisa Tanimoto,Yasushi Kishimoto,Takashi Fujii 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.1S
Controlling the friction between wheel and rail is direct and very effective measures to Improve the curving performances of railway trucks, because the curving performances depend much on friction characteristics Authors have proposed a method, "fllction control", which utilizes friction modifier (KELTRACKTM HPF) with onboard spraying system With the method, not only friction coefficient, but also fuction characteristics can be controlled as expected In this study, MBD simulation is very valuable tool to foresee the effect of the contiol In advance of experiment With real car And the creep characteristics of wheel/rail contact With the friction modifier takes very Important role In the simulation In this paper, authors propose a theoretical model of wheel/rat I contact condition considering the creep characteristics of friction modifier, Which is derived the application of principle tribological theories<br/>