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Tsuyoshi Takeda,Takashi Sasaki,Takafumi Mie,Takeshi Okamoto,Chinatsu Mori,Takaaki Furukawa,Yuto Yamada,Akiyoshi Kasuga,Masato Matsuyama,Masato Ozaka,Naoki Sasahira 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.4
Background/Aims: Digital single-operator cholangioscopy (DSOC)-guided mapping biopsy (DMB) and tube-assisted mapping biopsy(TMB) are two techniques used for preoperative evaluation of biliary tract cancer (BTC). However, data regarding the diagnostic performanceof these techniques are limited. Methods: We retrospectively examined consecutive patients with BTC who underwent either technique at our institution between2018 and 2020. We evaluated the technical success rate, adequate tissue acquisition rate, and diagnostic performance of these techniquesfor the evaluation of lateral spread of BTC. Results: A total of 54 patients were included in the study. The technical success rate of reaching the target sites was 95% for DMB and100% for TMB. The adequate tissue acquisition rate was 61% for DMB and 69% for TMB. The adequate tissue acquisition rate was low,especially for target sites beyond the secondary biliary radicles. The sensitivity of DMB alone was 39%, which improved to 65% whencombined with visual impression. Experts demonstrated a higher negative predictive value and diagnostic accuracy with respect toboth DSOC visual impression and DMB for the evaluation of lateral spread of BTC compared to trainees. Conclusions: Adequate tissue acquisition rates were similar between the two techniques. Since DMB requires expertise, TMB may bean acceptable option when DSOC is unavailable or when DSOC expertise is limited.
Verification of Autonomous Decentralized Control UPS system using FPGA based Hardware Controller
Tsuyoshi Saito,Nobuaki Doi,Tomoki Yokoyama 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Design concept of FPGA based hardware controller with HW/SW codesign for autonomous decentralized control UPS system is proposed. Progress of FPGA technology makes it possible to include the software macro CPU core into the FPGA chip, a high flexibility can be realized for the construction of the control processor in power electronics application. In the proposed method, all the control system is implemented in one FPGA chip. Complicated calculations are assigned to hardware calculation logic, and the parallel processing circuit makes it possible to realize minimizing the calculation time. Also Nios II CPU core is implemented in the same FPGA chip, and the software development can be applied for non-time critical calculations.The advantages of the proposed system is discussed through simulations and experiments.
Vortex Lens in Bi2Sr2CaCu2O8+y
Tsuyoshi Tamegai,Hiroyuki Chiku,Masashi Tokunaga 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
The control of pancake vortices (PVs) caused by Josephson vortices (JVs) is demonstrated in the highly anisotropic superconductor Bi2Sr2CaCu2O8+y. The moderately strong attractive interactions between PVs and JVs in the crossing-lattices state under tilted fields are utilized to change the distribution of PVs. Micro-Hall probe magnetometry and differential magneto-optical imaging provide direct evidence for such a novel control. We have succeeded in visualizing the lensing effect of PVs by slowly ramping the in-plane field in the presence of a small c-axis field. How the lensing effect is affected by the history, the density of PVs, and the temperature is systematically studied.
( Tsuyoshi Hamada ),( Takeshi Tsujino ),( Hiroyuki Isayama ),( Ryunosuke Hakuta ),( Yukiko Ito ),( Ryo Nakata ),( Kazuhiko Koike ) 대한간학회 2013 Gut and Liver Vol.7 No.2
Percutaneous transhepatic biliary drainage (PTBD) is an established procedure for biliary obstruction. However, duodenobiliary or jejunobiliary reflux of the intestinal contents through a PTBD catheter sometimes causes recurrent catheter obstruction or cholangitis. A 64-year-old female patient with a history of choledochojejunostomy was referred to our department with acute cholangitis due to choledochojejunal anastomotic obstruction. Emergent PTBD was performed, but frequent obstructions of the catheter due to the reflux of intestinal contents complicated the post-PTBD course. We therefore introduced a catheter with an antireflux mechanism to prevent jejunobiliary reflux. A commercially available catheter was modified; side holes were made at 1 cm and 5 to 10 cm (1 cm apart) from the tip of the catheter, and the catheter was ligated with a nylon thread just proximal to the first side hole. Using this novel "antireflux PTBD technique," jejunobiliary reflux was prevented successfully, resulting in a longer patency of the catheter. (Gut Liver 2013;7:255-257)