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Okuno, Hiroshi,Sato, Sohei,Kawakami, Takeshi,Yamamoto, Kazuya,Tanaka, Tadao The Korean Association for Radiation Protection 2021 방사선방어학회지 Vol.46 No.2
Background: The Japan Atomic Energy Agency (JAEA) is specified in the Disaster Counter-measures Basic Act as a designated public corporation for dealing with nuclear disasters. Materials and Methods: The Nuclear Emergency Assistance and Training Center (NEAT) was established in 2002 as the activity base providing technical assistance to both national and local governments during nuclear emergencies. The NEAT has a robust structure and utilities and special installations, and it organizes training and exercises. Results and Discussion: Due to an offshore earthquake that caused a devastating tsunami in March 2011, a nuclear accident occurred at the Tokyo Electric Power Company's Fukushima Daiichi Nuclear Power Station. The NEAT responded by conducting off-site environmental radiation monitoring and contamination screening, dispatching special vehicles, offering telephone consultations, and calculating the dispersion of radioactive materials. An examination of the emergency response activities revealed that the organization was prepared for these types of disasters and was able to plan long-term response. Conclusion: As a designated public corporation, the JAEA technically supports the national government, the Fukushima prefectural government, and the Ibaraki prefectural government, all of which responded to the off-site emergencies resulting from the March 2011 Fukushima Daiichi accident
Temperature dependence of spin Hall magnetoresistance in W/CoFeB bilayer
Okuno, Takaya,Taniguchi, Takuya,Kim, Sanghoon,Baek, Seung-heon Chris,Park, Byong-Guk,Moriyama, Takahiro,Kim, Kab-Jin,Ono, Teruo Institute of Pure and Applied Physics 2016 Japanese Journal of Applied Physics Vol. No.
<P>We investigate the temperature dependence of the spin Hall magnetoresistance (SMR) in a W/CoFeB bilayer. The SMR is found to increase with decreasing temperature. An analysis based on the SMR theory suggests that the spin Hall angle of W and/or the spin polarization of CoFeB can be the origin of the temperature dependence of the SMR. We also find that the spin diffusion length and the resistivity of W do not significantly vary with temperature, which indicates the necessity of further study on the electron transport mechanism in W films to reveal the origin of the spin Hall effect in W. (C) 2016 The Japan Society of Applied Physics</P>
Okuno Takuya,Hirose Kazuhiro,Moriguchi Hideki,Yamamoto Eiji,Uchino Katsuya,Kitagawa Nobuyuki 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In recent years, PCB drills with smaller diameters less than 0.1 mm are used and thus there are growing needs for ultra-fine grained cemented carbides. However, ultra-fine WC powder usually causes extraordinary grain growth during sintering which weakens mechanical strength of ultra-fine grained cemented carbides. So we examined several kinds of WC powders to make new ultra-fine grained cemented carbides having superior performance. We found that direct carburized WC powder is very good as a WC raw material. The PCB drills made of the developed ultra-fine grained cemented carbides have higher hardness, toughness and stiffness than conventional ones.
Nozomi Okuno,Kazuo Hara,Nobumasa Mizuno,Shin Haba,Takamichi Kuwahara,Hiroki Koda,Masahiro Tajika,Tsutomu Tanaka,Sachiyo Onishi,Keisaku Yamada,Akira Miyano,Daiki Fumihara,Moaz Elshair 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.4
Background/Aims: The Japan Gastroenterological Endoscopy Society (JGES) has published guidelines for gastroenterologicalendoscopy in patients undergoing antithrombotic treatment. These guidelines classify endoscopic ultrasound-guided biliary drainage(EUS-BD) as a high-risk procedure. Nevertheless, the bleeding risk of EUS-BD in patients undergoing antithrombotic therapy isuncertain. Therefore, this study aimed to assess the bleeding risk in patients undergoing antithrombotic therapy. Methods: This single-center retrospective study included 220 consecutive patients who underwent EUS-BD between January 2013and December 2018. We managed the withdrawal and continuation of antithrombotic agents according to the JGES guidelines. Wecompared the bleeding event rates among patients who received and those who did not receive antithrombotic agents. Results: A total of 18 patients (8.1 %) received antithrombotic agents and 202 patients (91.8 %) did not. Three patients experiencedbleeding events, with an overall bleeding event rate of 1.3% (3/220): one patient was in the antithrombotic group (5.5%) and twopatients were in the non-antithrombotic group (0.9%) (p=0.10). All cases were moderate. The sole thromboembolic event (0.4%) wasa cerebral infarction in a patient in the non-antithrombotic group. Conclusions: The rate of EUS-BD-related bleeding events was low. Even in patients receiving antithrombotic therapy, the bleedingevent rates were not significantly different from those in patients not receiving antithrombotic therapy.
An Approach to the Interactive Design Process Using Genetic Algorithms
Taku OKUNO,Yukinori KAKAZU 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
This paper is aiming to apply the Genetic Algorithms(GAs) to the interactive design. For that purpose, the scheme for utilizing the past design processes for the next interactive design process is proposed. In this scheme, the process consists of three phases: the searching phase, the tuning phase and the design phase. The first phase searches the optimal decision sequences for the past design instances by GAs. By the collected sequences, the second phase tunes the criteria of selecting decision sequences for the next design process. By this scheme, the implicit constraints satisfied in the past design can be applied to the next design. Finally, the computer simulations on the simple gear-train design were carried out to show the effectiveness of the scheme.
Endoscopic ultrasound-guided drainage for an abscess cavity
Nozomi Okuno,Kazuo Hara,Nobumasa Mizuno,Shin Haba,Takamichi Kuwahara,Yasuhiro Kuraishi,Takafumi Yanaidani,Sho Ishikawa,Tsukasa Yasuda,Masanori Yamada,Toshitaka Fukui 소화기인터벤션의학회 2022 International journal of gastrointestinal interven Vol.11 No.4
Endoscopic ultrasound (EUS)-guided interventions, including EUS-guided biliary drainage and EUS-guided cystic drainage, are now well developed and in widespread use. Intraperitoneal abscess requires drainage because mortality associated with an undrained abscess is high. Percutaneous or surgical drainage has traditionally been performed, but there have been numerous reports of EUS-guided drainage for intraperitoneal abscesses in recent years. EUS-guided abscess drainage has the advantage of being less invasive and enabling direct access to the cavity via the trans-luminal route as well as clear visualization of interposed vessels using color Doppler ultrasonography. It is necessary to consider the advantages and disadvantages when selecting a drainage method. This article reviews the current status of EUS-guided abscess drainage at three sites: the liver, pelvis, and mediastinum.
Infectious peritonitis after endoscopic ultrasound-guided biliary drainage in a patient with ascites
Nozomi Okuno,Kazuo Hara,Nobumasa Mizuno,Takamichi Kuwahara,Hiromichi Iwaya,Masahiro Tajika,Tsutomu Tanaka,Makoto Ishihara,Yutaka Hirayama,Sachiyo Onishi,Kazuhiro Toriyama,Ayako Ito,Naosuke Kuraoka,Shi 소화기인터벤션의학회 2018 International journal of gastrointestinal interven Vol.7 No.1
Summary of Event Bacterial, mycotic peritonitis and Candida fungemia developed in a patient with moderate ascites who had undergone endoscopic ultrasound-guided biliary drainage (EUS-BD). Antibiotics and antifungal agent were administered and ascites drainage was performed. Although the infection improved, the patient’s general condition gradually deteriorated due to aggravation of the primary cancer and he died. Teaching Point This is the first report to describe infectious peritonitis after EUS-BD. Ascites carries the potential risk of severe complications. As such, in patients with ascites, endoscopic retrograde cholangiopancreatography (ERCP) is typically preferred over EUS-BD or percutaneous drainage to prevent bile leakage. However, ERCP may not be possible in some patients with tumor invasion of the duodenum or with surgically altered anatomy. Thus, in patients with ascites who require EUS-BD, we recommend inserting the drainage tube percutaneously and draining the ascites before and after the intervention in order to prevent severe infection. Summary of Event Bacterial, mycotic peritonitis and Candida fungemia developed in a patient with moderate ascites who had undergone endoscopic ultrasound-guided biliary drainage (EUS-BD). Antibiotics and antifungal agent were administered and ascites drainage was performed. Although the infection improved, the patient’s general condition gradually deteriorated due to aggravation of the primary cancer and he died. Teaching Point This is the first report to describe infectious peritonitis after EUS-BD. Ascites carries the potential risk of severe complications. As such, in patients with ascites, endoscopic retrograde cholangiopancreatography (ERCP) is typically preferred over EUS-BD or percutaneous drainage to prevent bile leakage. However, ERCP may not be possible in some patients with tumor invasion of the duodenum or with surgically altered anatomy. Thus, in patients with ascites who require EUS-BD, we recommend inserting the drainage tube percutaneously and draining the ascites before and after the intervention in order to prevent severe infection.