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( Tamiko Saito ),( Masafumi Naito ),( Yuki Matsumura ),( Hisaaki Kita ),( Tomoyo Kanno ),( Yuki Nakada ),( Mina Hamano ),( Miho Chiba ),( Kosaku Maeda ),( Tomoki Michida ),( Toshifumi Ito ) The Editorial Office of Gut and Liver 2014 Gut and Liver Vol.8 No.5
A 75-year-old Japanese man with chronic hepatitis C was found to have a large liver tumor and multiple nodules in the bilateral lungs. We diagnosed the tumor as hepatocellular carcinoma (HCC) with multiple lung metastases based on imaging studies and high titers of HCC tumor markers. Remarkably, without any anticancer treatment or medication, including herbal preparations, the liver tumor decreased in size, and the tumor makers diminished. Moreover, after 1 year, the multiple nodules in the bilateral lungs had disappeared. Fifteen months after the first medical examination, transcatheter arterial chemoembolization (TACE) was performed for the residual HCC. Because local relapse was observed on follow-up computed tomography, a second TACE was performed 13 months after the first one. At 4 years after the second TACE (7 years after the initial medical examination), there was no recurrence of primary or metastatic lesions. Spontaneous regression of HCC is very rare, and its mechanism remains unclear. Understanding the underlying mechanism of this rare phenomenon may offer some hope of finding new therapies, even in advanced metastatic cases. (Gut Liver 2014;8:569-574)
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.
Ippei Tanaka,Dai Hirasawa,Hiroaki Saito,Junichi Akahira,Tomoki Matsuda 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.6
Background/Aims: Endoscopic submucosal dissection (ESD) for superficial non-ampullary duodenal tumors (SNADETs) is associat-ed with a high rate of en bloc resection. However, the technique for ESD remains challenging. Recent studies have demonstrated the ef-fectiveness of S-O clips in colonic and gastric ESD. We evaluated the efficacy and safety of duodenal ESD using an S-O clip for SNA-DETs. Methods: Consecutive patients who underwent ESD for SNADETs between January 2011 and December 2021 were retrospectively en-rolled. Propensity score matching analysis was used to compare patients who underwent duodenal ESD with the S-O clip (S-O group)and those who underwent conventional ESD (control group). Intraoperative perforation rate was the primary outcome, while proce-dure time and R0 resection rate were the secondary outcomes. Results: After propensity score matching, 16 pairs were created: 43 and 17 in the S-O and control groups, respectively. The intraopera-tive perforation rate in the S-O group was significantly lower than that in the control group (p=0.033). A significant difference was ob-served in the procedure time between the S-O and control groups (39±9 vs. 82±30 minutes, respectively; p=0.003). Conclusions: The S-O clip reduced the intraoperative perforation rate and procedure time, which may be useful and effective in duo-denal ESD.