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Utility of the Gel Immersion Method for Treating Massive Colonic Diverticular Bleeding
Kazuki Yamamoto,Yasutoshi Shiratori,Takashi Ikeya 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.2
Background/Aims: In Asia, right-sided diverticular bleeding is more common than that of the left side. It often causes massivebleeding and difficulties in identifying the stigmata of recent hemorrhage (SRH) of colonic diverticular bleeding (CDB). This caseseries demonstrates the efficacy of the gel immersion method using OS-1 Jelly (Otsuka Pharmaceuticals Factory, Tokushima, Japan)in patients with CDB. Methods: This retrospective case series analyzed data of patients with CDB who underwent the gel immersion method fromApril 2016 to February 2020 at St. Luke’s International Hospital, Japan. All patients diagnosed with CDB who underwent the gelimmersion method were included. We collected data on the site of bleeding, identification of SRH, and efficacy of the method fromthe electronic medical records. Results: A total of 9 patients (including 7 with right-sided CDB) underwent gel immersion method and were included in this study. SRH were successfully found in 66.7% (6/9) of patients. Moreover, effective hemostasis was achieved in 85.7% (6/7) of patients withright-sided CDB. There were no adverse events. Conclusions: The gel immersion method was found to be effective, especially for massive right-sided CDB.
Point-Gap Topology of Non-Hermitian Many-Body Systems
Shu Hamanaka,Kazuki Yamamoto,Tsuneya Yoshida 한국물리학회 2023 새물리 Vol.73 No.12
In the non-Hermitian system, the complex-valued spectrum leads to a unique topology known as the point-gap topology. Recent studies within a single-particle picture have shown that the nontrivial point-gap topology induces the non-Hermitian skin effect (NHSE), which denotes significant dependence of the eigenstates and eigenvalues on boundary conditions. However, most of the studies focus on the noninteracting case, and little is known about the effect of interactions on the point-gap topology. In this paper, we study the one-dimensional non-Hermitian fermionic system with a complex-valued interaction. By performing the numerical diagonalization, we demonstrate that the strong interaction induces the NHSE. Moreover, we show that the many-body topological invariant takes a nonzero value corresponding to the NHSE.
Takashi Tamura,Yasunobu Yamashita,Kazuki Ueda,Yuki Kawaji,Masahiro Itonaga,Shin-ichi Murata,Kaori Yamamoto,Takeichi Yoshida,Hiroki Maeda,Takao Maekita,Mikitaka Iguchi,Hideyuki Tamai,Masao Ichinose,Jun 대한소화기내시경학회 2017 Clinical Endoscopy Vol.50 No.4
Background/Aims: Endoscopic ultrasonography-guided fine-needle aspiration (EUS-FNA) has been used to diagnose gastrointestinal submucosal tumors (SMTs). Although rapid on-site evaluation (ROSE) has been reported to improve the diagnostic accuracy of EUS-FNA for pancreatic lesions, on-site cytopathologists are not routinely available. Given this background, the usefulness of ROSE by endosonographers themselves for pancreatic tumors has also been reported. However, ROSE by endosonographers for diagnosis of SMT has not been reported. The aim of this study was to evaluate the diagnostic accuracy of EUS-FNA with ROSE by endosonographers for SMT, focusing on diagnosis of gastrointestinal stromal tumor (GIST), compared with that of EUS-FNA alone. Methods: Twenty-two consecutive patients who underwent EUS-FNA with ROSE by endosonographers for SMT followed by surgical resection were identified. Ten historical control subjects who underwent EUS-FNA without ROSE were used for comparison. Results: The overall diagnostic accuracy for SMT was significantly higher in cases with than without ROSE (100% vs. 80%, p=0.03). The number of needle passes by FNA with ROSE by endosonographers tended to be fewer, although accuracy was increased (3.3±1.3 vs. 5.9±3.8, p=0.06). Conclusions: ROSE by endosonographers during EUS-FNA for SMT is useful for definitive diagnosis, particularly for GIST.
Effects of blade tip profile on in-plane tensile properties of wedge-notchedpolypropylene sheet
Shigeru Nagasawa,Akihiro Yamamoto,Thepwachara Ruchirabha,Kazuki Umemoto 한국소성가공학회 2018 플라스틱가공 심포지엄(한일 공동 세미나) Vol.2018 No.8
In this work a tensile characteristic of 0.2mm thickness polypropylene (PP) sheet subjected to indentation of a virgin and a brunt wedge (apex angle of α=42°, tip thickness of w=6㎛, 20㎛) was experimentally investigated. In order to reveal the effect of mechanical condition, such as a notched depth and profile of root surface on the breaking behavior of the half-cut PP specimen, the in-plane uni-axial tensile test was carried out by varying the indentation depth and the tensile velocity. Through the experiments, the breakage behavior of scored (half-cut) zone was characterized with the indentation depth, the tip thickness and the strain rate. The crazing by the brunt wedge decreases the tensile resistance and the burr elongation for the indentation depth larger than 0.9, whereas the work-hardening by the brunt wedge increases them for the indentation depth less than 0.8. When using the virgin wedge and/or under a high strain rate larger than 0.01 s<SUP>-1</SUP>, the breakage of half-cut zone of PP sheet became brittle, namely the tensile resistance and the burr elongation were decreased.
Experimental Flight of KIT Student’s Rocket in France
Koji Okuda,Yuji Ujimoto,Yuta Otsuka,Takaya Sato,Takuya Shidooka,Daijiro Semba,Kenichi Tominaga,Junichi Fukuda,Yuta Yamamoto,Kazuki Wada,Shinichi Sagara,Koichi Yonemoto 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
KIT Student's Rocket has been developed by a student group of Kyushu Institute of Technology lor rocket launch campaign held at La Courtine in France since 2006. This paper introduces the newest design of rocket. The rocket has the body length of 2120㎜, and weighs 14.6㎏ and can reach to an altitude of about 700㎜ by a solid rocket motor provided by CNES (the French Centre National D’Etudes Spatiales). The rocket is controlling rolling attitude during ascent phase and then deploying a parafoil at the apogee of the trajectory for recovery guidance to an aiming point.