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A Study on Ship’s Autopilot System for a Small Boat
Toshihiko NAKATANI,Makoto ENDO,Keiji SASAYA,Takashi MIWA,Hiroshi MIKAMI,Taizo KANEDA,Emi KANAYAMA,Erika URA 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper describes dynamics analysis of a small training boat and the application of a gain map PID controller to the autopilot of the vessel. After upgrading the autopilot of the Sazanami, an actual small training boat, in order to identify the boat model, zigzag maneuver trials were performed at various speeds. It was found that the Nomoto gain and time constant changed considerably with the vessel’s speed. Based on this analysis, an improved autopilot system that utilizes a gain map PID controller to compensate for vessel maneuverability changes was designed. From the results of various control simulations, we determined that the proposed system offered significant performance improvements over the vessel’s conventional autopilot.
Water Lubricated Guide Bearing with Self-aligning Segments
Oguma, Tadashi,Nakagawa, Naritoshi,Mikami, Makoto,Thantrong, Long,Kizaki, Yasumi,Takimoto, Fumio Korean Society for Fluid machinery 2013 International journal of fluid machinery and syste Vol.6 No.2
Water lubricated guide bearing was newly released and has been applied to actual hydro turbines with vertical shaft. As a result, they can have not only high bearing performance but environmental advantages in meeting the demand for reducing river pollution by oil leakage from oil lubricated guide bearing. The PTFE composite guide bearing was tested by experimental equipment operated under conditions similar to those of actual hydro turbines. Circumferential and axial tilting bearing segments help to improve the bearing performance and efficiency due to low friction loss in the bearing system. Furthermore, bearing cooling systems could be eliminated and maintenance periods could be extended, thus the initial investment and operating costs of the hydroelectric power plant are reduced.
Water Lubricated Guide Bearing with Self-aligning Segments
Tadashi OGUMA,Naritoshi NAKAGAWA,Makoto MIKAMI,Long THANTRONG,Yasumi KIZAKI,Fumio TAKIMOTO 한국유체기계학회 2013 International journal of fluid machinery and syste Vol.6 No.2
Water lubricated guide bearing was newly released and has been applied to actual hydro turbines with vertical shaft. As a result, they can have not only high bearing performance but environmental advantages in meeting the demand for reducing river pollution by oil leakage from oil lubricated guide bearing. The PTFE composite guide bearing was tested by experimental equipment operated under conditions similar to those of actual hydro turbines. Circumferential and axial tilting bearing segments help to improve the bearing performance and efficiency due to low friction loss in the bearing system. Furthermore, bearing cooling systems could be eliminated and maintenance periods could be extended, thus the initial investment and operating costs of the hydroelectric power plant are reduced.
홍상휘,문지훈,Kouji Mimura,Makoto Mikami,Masahito Uchikoshi,Minoru Isshiki 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.2
We have investigated the effect of annealing in an O2 atmosphere on the electrical properties of high-quality ZnO single crystals grown by seeded chemical vapor transport (SCVT). A temperature dependent Hall-effect technique indicates that the dominant donor in as-grown ZnO crystals has an ED of 42.8 meV and ND value of 2.8 × 1017 cm−3. After heat treatment in the O2 atmosphere at 1000 oC for 5 h, the color of the crystal changed from an orange color to transparent, and the ND value decreased to 4.3 × 1016 cm−3, while the ED value did not change. It can be deduced that the dominant donor in as-grown ZnO single crystals is a donor type native defect, which has a donor binding energy of about 42.8 meV.
( Shinta Mizuno ),( Keiko Ono ),( Yohei Mikami ),( Makoto Naganuma ),( Tomohiro Fukuda ),( Kazuhiro Minami ),( Tatsuhiro Masaoka ),( Soichiro Terada ),( Takeshi Yoshida ),( Keiichiro Saigusa ),( Norim 대한장연구학회 2020 Intestinal Research Vol.18 No.1
Background/Aims: 5-Aminosalicylic acid (ASA) causes intolerance reactions in some patients. This study was performed to examine the prognosis of patients with ulcerative colitis (UC) and 5-ASA intolerance, and to evaluate the potential interaction between 5-ASA intolerance and the intestinal microbiota. Methods: We performed a retrospective cohort study of patients with UC who visited participating hospitals. The primary endpoint was to compare the incidence of hospitalization within 12 months between the 5-ASA intolerance group and the 5-ASA tolerance group. The secondary endpoint was to compare the risk of adverse clinical outcomes after the start of biologics between the 2 groups. We also assessed the correlation between 5-ASA intolerance and microbial change in an independently recruited cohort of patients with UC. Results: Of 793 patients, 59 (7.4%) were assigned to the 5-ASA intolerance group and 734 (92.5%) were assigned to the 5-ASA tolerance group. The admission rate and incidence of corticosteroid use were significantly higher in the intolerance than tolerance group (P<0.001). In 108 patients undergoing treatment with anti-tumor necrosis factor biologics, 5-ASA intolerance increased the incidence of additional induction therapy after starting biologics (P<0.001). The 5-ASA intolerance group had a greater abundance of bacteria in the genera Faecalibacterium, Streptococcus, and Clostridium than the 5-ASA tolerance group (P<0.05). Conclusions: In patients with UC, 5-ASA intolerance is associated with a risk of adverse clinical outcomes and dysbiosis. Bacterial therapeutic optimization of 5-ASA administration may be important for improving the prognosis of patients with UC. (Intest Res 2020;18:69-78)
Lee, Wonju,Kinosita, Yoshiaki,Oh, Youngjin,Mikami, Nagisa,Yang, Heejin,Miyata, Makoto,Nishizaka, Takayuki,Kim, Donghyun AMERICAN CHEMICAL SOCIETY 2015 ACS NANO Vol.9 No.11
<P>In this paper, we describe super-resolved sampling of live bacteria based on extraordinary optical transmission (EOT) of light. EOT is produced by surface plasmon confinement and coupling with nanostructures. Bacterial fluorescence is excited by the localized fields for subdiffraction-limited sampling. The concept was applied to elucidating bacterial dynamics of gliding Mycoplasma mobile (M. mobile). The results analyzed with multiple M. mobile bacteria show individual characters and reveal that M. mobile undergoes a significant axial variation at 94 nm. The sampling error of the method is estimated to be much smaller than 1/10 of the diffraction limit both in the lateral and depth axis. The method provides a powerful tool for investigation of biomolecular dynamics at subwavelength precision.</P>
Kaoru Takabayashi,Naoki Hosoe,Motohiko Kato,Yukie Hayashi,Ryoichi Miyanaga,Kosaku Nanki,Kayoko Fukuhara,Yohei Mikami,Shinta Mizuno,Tomohisa Sujino,Makoto Mutaguchi,Makoto Naganuma,Naohisa Yahagi,Haruh 거트앤리버 소화기연관학회협의회 2020 Gut and Liver Vol.14 No.5
Background/Aims: The evaluation of small bowel lesions of Crohn’s disease (CD) using balloon-assisted enteroscopy (BAE) is crucial because mucosal healing is associated with a good prognosis. However, BAE procedures are invasive, requiring sedation or analgesia to reduce the patient’s pain. This study evaluated the clinical usefulness of a novel ultrathin single-balloon enteroscopy (SBE) procedure for CD. Methods: This single-center retrospective study included 102 CD patients who underwent trans-anal SBE between January 2012 and May 2018. Of these patients, 82 underwent enteroscopy using conventional SBE, while 20 underwent ultrathin SBE. Patients were analyzed using propensity score matching, with 20 patients per group. The median duration of the examination, terminal ileum intubation rate, median cecum intubation time, median insertion depth, adverse events, and sedated dose in each group were compared. Results: Before propensity score matching, the conventional SBE group had a larger number of surgical history patients than the ultrathin SBE group (p=0.05). After matching, the two groups did not significantly differ clinically. There were no significant differences in the mean duration of the examination, cecum intubation time, or terminal ileal intubation rate between ultrathin SBE and conventional SBE. The mean insertion depth of ultrathin SBE tended to be deeper than that of conventional SBE (p=0.09). The use of ultrathin SBE also reduced the sedative dose during needed for enteroscopy compared with conventional SBE (p=0.005). Conclusions: Novel ultrathin SBE may be less painful for CD patients than conventional SBE.