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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.
Pairing Symmetry in the Ordered Honeycomb Network Superconductor BaPtSb
Tsuyoshi Imazu,Masafumi Kudo,Shohei O. Singu,Jun Goryo,Yoshiki Imai 한국물리학회 2023 새물리 Vol.73 No.12
We investigate the pairing symmetry of the ordered honeycomb network superconductor BaPtSb with broken inversion symmetry. There is a preliminary μSR measurement report below critical temperature (Tc) suggesting the superconducting state with time-reversal symmetry breaking (TRSB). In this paper, first principles calculation is performed and we find the effective tight-binding model which reproduces the Fermi surfaces consisting of Pt 5d<SUB>x2-y2</SUB> , 5d<SUB>xy</SUB> and Sb 5p<SUB>z</SUB> orbitals mainly. In order to discuss the pairing symmetry of BaPtSb we classify the gap functions based on crystal point group and solve the gap equations, and the condensation energies are calculated. Consequently, on the most dominant Fermi surface, chiral d-wave state is most stable among the TRSB states.
( Tsuyoshi Hamada ),( Hiroyuki Isayama ),( Yousuke Nakai ),( Osamu Togawa ),( Naminatsu Takahara ),( Rie Uchino ),( Suguru Mizuno ),( Dai Mohri ),( Hiroshi Yagioka ),( Hirofumi Kogure ),( Saburo Matsu 대한소화기학회 2017 Gut and Liver Vol.11 No.1
Background/Aims: In distal malignant biliary obstruction, an antireflux metal stent (ARMS) with a funnel-shaped valve is effective as a reintervention for metal stent occlusion caused by reflux. This study sought to evaluate the feasibility of this ARMS as a first-line metal stent. Methods: Patients with nonresectable distal malignant biliary obstruction were identified between April and December 2014 at three Japanese tertiary centers. We retrospectively evaluated recurrent biliary obstruction and adverse events after ARMS placement. Results: In total, 20 consecutive patients were included. The most common cause of biliary obstruction was pancreatic cancer (75%). Overall, recurrent biliary obstruction was observed in seven patients (35%), with a median time to recurrent biliary obstruction of 246 days (range, 11 to 246 days). Stent occlusion occurred in five patients (25%), the causes of which were sludge and food impaction in three and two patients, respectively. Stent migration occurred in two patients (10%). The rate of adverse events associated with ARMS was 25%: pancreatitis occurred in three patients, cholecystitis in one and liver abscess in one. No patients experienced nonocclusion cholangitis. Conclusions: The ARMS as a first-line biliary drainage procedure was feasible. Because the ARMS did not fully prevent stent dysfunction due to reflux, further investigation is warranted. (Gut Liver 2017;11:142-148)