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Current Treatment Strategy for Superficial Nonampullary Duodenal Epithelial Tumors
Tetsuya Suwa,Kohei Takizawa,Noboru Kawata,Masao Yoshida,Yohei Yabuuchi,Yoichi Yamamoto,Hiroyuki Ono 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.1
Endoscopic submucosal dissection (ESD) is the standard treatment method for esophageal, gastric, and colorectal cancers. However,it has not been standardized for duodenal lesions because of its high complication rates. Recently, minimally invasive and simplemethods such as cold snare polypectomy and underwater endoscopic mucosal resection have been utilized more for superficialnonampullary duodenal epithelial tumors (SNADETs). Although the rate of complications associated with duodenal ESD has beengradually decreasing because of technical advancements, performing ESD for all SNADETs is unnecessary. As such, the appropriatetreatment plan for SNADETs should be chosen according to the lesion type, patient condition, and endoscopist’s skill.
Endocuff-Assisted versus Cap-Assisted Colonoscopy Performed by Trainees: A Retrospective Study
Yutaka Okagawa,Tetsuya Sumiyoshi,Yusuke Tomita,Shutaro Oiwa,Fumihiro Ogata,Takashi Jin,Masahiro Yoshida,Ryoji Fujii,Takeyoshi Minagawa,Kohtaro Morita,Hideyuki Ihara,Michiaki Hirayama,Hitoshi Kondo 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.3
Background/Aims: The adenoma detection rate (ADR) of screening colonoscopies performed by trainees is often lower than thatof colonoscopies performed by experts. The effcacy of cap-assisted colonoscopy (CAC) in adenoma detection is well documented,especially that of CACs performed by trainees. Endocuff, a new endoscopic cap, is reportedly useful for adenoma detection; however,no trials have compared the effcacy of Endocuff-assisted colonoscopy (EAC) and CAC conducted by trainees. Therefore, the presentstudy retrospectively compared the effcacy between EAC and CAC in trainees. Methods: This was a single-center, retrospective study involving 305 patients who underwent either EAC or CAC performed by threetrainees between January and December 2018. We evaluated the ADR, mean number of adenomas detected per patient (MAP), cecalintubation rate, cecal intubation time, and occurrence of complications between the EAC and CAC groups. Results: The ADR was significantly higher in the EAC group than in the CAC group (54.3% vs. 37.3%, p=0.019), as was the MAP (1.36vs. 0.74, p=0.003). No significant differences were found between the groups with respect to the cecal intubation rate or cecal intubationtime. No major complications occurred in either group. Conclusions: Our results suggest that EAC exhibits increased ADR and MAP compared to CAC when performed by trainees.
Masayoshi Seike,Tetsuya Fukushima,Kazunori Sato,Hiroshi Katayama-Yoshida 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We present a materials design of MgO-based d0 ferromagnets with a high blocking temperature(TB) based on multiscale simulations. The chemical pair interactions between the N atoms inMg(O,N) and the Mg vacancies (VMg) in (Mg,VMg)O were calculated using a generalized gradientapproximation, and Monte Carlo simulations of the crystal growth were performed to predictthe configurations of the dopant distribution. Our simulations showed that self-organized nanostructurescould be formed both in Mg(O,N) and (Mg,VMg)O, which suggests that a high TB canbe obtained in these d0 ferromagnets due to the superparamagnetic blocking phenomenon. Furthermore,depending on the crystal growth conditions, it was shown that various self-organizednanostructures, such as three-dimensional nanoclusters and one-dimensional nanowires, could appear.
Maneuverability of Flexible Mono-tread Mobile Track(FMT)
Takafumii Haji,Tetsuya Kinugasa,Koji Yoshida,Hisanori Amano,Koichi Osuka 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In the past decade, search robots in rescue operations have been focused on and developed for the purpose of finding survivors trapped in the rubble of collapsed buildings. Most of them adopt serpentine Mechanisms. However, they might gather to catch debris between tracks or become stuck due to the mechanisms. To get over the problems, a new mobile mechanism have been proposed: flexible mono-tread mobile track (FMT), and a prototype "Rescue mobile track No.2(RT-02) WORM" was developed. The machine is composed of a "flexible chain" and vertebral structure, the body flexes in 3D. As a result of the specific turning mechanism, steering performance of FMT is different from the usual differential-type tracked vehicle (DTV). The purpose of this paper si to show the maneuverability of FMT comparing with that of DTV through some experiments.
Online Walking Pattern Generation for Biped Walking
Hun-ok Lim,Tetsuya Yoshida 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper describes an online walking pattern generation method for biped humanoid robots which is based on a preview control method. Depending on the walking parameters, a 3-step pattern and reference ZMP are generated, and one step in the pattern is selected for walking. If another 3-step pattern is created, it will connect with the previous step using linear interpolation. This pattern generation method is able to deal with forward, sideward and forward-sideward mixed walking. In order to confirm the pattern generation method, various walking simulations are conducted using MATLAB/Simulink and ADAMS.
Mechanisms of Biped Humanoid Robot and Online Walking Pattern Generation
Kouhei Yamada,Keisuke Sayama,Tetsuya Yoshida,Hun-ok Lim 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper describes the mechanism of a biped humanoid robot, KBHR (Kanagawa Biped Robot-2), that has large moveable angles similar to humans’. The KBHR has 29 degrees of freedom (DOF) (two 6 DOF legs, a 3 DOF waist and two 7 DOF arms). Also, an online walking pattern generation method for a biped humanoid robot based on preview control is proposed. Depending on the walking parameters (step length, height, etc.), a pre-3-step pattern is created, and one step of the 3-step pattern is selected for one step of the robot. Using KBHR, various walking experiments are conducted, and the effectiveness of the mechanism and the online walking pattern generation method is confirmed.
( Takato Maeda ),( Hirotake Sakuraba ),( Hiroto Hiraga ),( Shukuko Yoshida ),( Yoichi Kakuta ),( Hidezumi Kikuchi ),( Shogo Kawaguchi ),( Keisuke Hasui ),( Tetsuya Tatsuta ),( Daisuke Chinda ),( Tatsu 대한장연구학회 2022 Intestinal Research Vol.20 No.1
Background/Aims: Thiopurines are key drugs for inflammatory bowel disease (IBD), including ulcerative colitis (UC) and Crohn’s disease (CD). Recently, NUDT15 polymorphism (R139C, c.415C>T) has been shown to be associated with thiopurine-induced adverse events in Asian populations. In patients with the C/T genotype, low-dose thiopurine treatment is recommended, but its long-term efficacy and tolerability remain unclear. This study aimed to uncover the long-term efficacy and appropriate dosage of thiopurine for IBD patients with the C/T genotype. Methods: A total of 210 patients with IBD (103 UC and 107 CD) determined to have NUDT15 R139C variants were enrolled. Clinical data were retrospectively reviewed from medical records. Results: Of 46 patients (21.9%) with the C/T genotype, 30 patients (65.2%) were treated with thiopurines. Three of whom (10.0%) discontinued thiopurine treatment due to adverse events and 27 of whom continued. The median maintenance dosage of 6-mercaptopurine was 0.25 mg/kg/day (range, 0.19-0.36 mg/kg/day), and 6-thioguanine nucleotides level was 230 (104-298) pmol/8×10<sup>8</sup> red blood cells. Cumulative thiopurine continuation rates for 120 months for patients with the C/C and C/T genotypes were not significantly different (P=0.895). Cumulative non-relapse rates in the patients with UC treated with thiopurine monotherapy and surgery-free rates in CD patients treated with combination therapy (thiopurines and anti-tumor necrosis factor-α agents) for maintenance remission were not significantly different at 60 months (C/C vs. C/T, P=0.339 and P=0.422, respectively). Conclusions: Low-dose thiopurine treatment is an effective and acceptable treatment for patients with C/T genotype. (Intest Res 2022;20:90-100)