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Silica-Based Planar Lightwave Circuits for WDM Applications
Okamoto, Katsunari,Inoue, Yasuyuki,Tanaka, Takuya,Ohmori, Yasuji The Korean Institute of Electrical and Electronic 1998 전기전자재료 Vol.11 No.11
Planar lightwave circuits (PLCs) provide various important devices for optical wavelength division multiplexing (WDM) systems, subscriber networks and etc. This paper reviews the recent progress and future prospects of PLC technologies including arrayed-waveguide grating multiplexers, optical add/drop multiplexers, programmable dispersion equalizers and hybrid optoelectronics integration technologies.
A New Moving-magnet Type Linear Actuator utilizing Flux Concentration Permanent Magnet Arrangement
Akira Goto,Takuya Okamoto,Atsushi Ikariga,Takashi Todaka,Masato Enokizono 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.3
This paper presents a moving-magnet type linear actuator designed by using flux concentration type permanent magnet arrangement, which can generate higher magnetic flux density in air-gap. In this construction, detent force which is induced by both slot-effect and end-effect becomes larger due to strong attractive forces. To reduce cogging force we have employed a modular mover structure of two magnetic pole sections connected with a center yoke. The improved motor performance is demonstrated with the prototype machine.
A New Moving-magnet Type Linear Actuator utilizing Flux Concentration Permanent Magnet Arrangement
Goto, Akira,Okamoto, Takuya,Ikariga, Atsushi,Todaka, Takashi,Enokizono, Masato The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.3
This paper presents a moving-magnet type linear actuator designed by using flux concentration type permanent magnet arrangement, which can generate higher magnetic flux density in air-gap. In this construction, detent force which is induced by both slot-effect and end-effect becomes larger due to strong attractive forces. To reduce cogging force we have employed a modular mover structure of two magnetic pole sections connected with a center yoke. The improved motor performance is demonstrated with the prototype machine.
Longer prolapsed rectum length increases recurrence risk after Delorme’s procedure
Tanabe Taro,Yamaguchi Emi,Nakada Takuya,Nishio Risa,Okamoto Kinya,Yamana Tetsuo 대한대장항문학회 2022 Annals of Coloproctolgy Vol.38 No.4
Purpose: Risk factors for recurrence of rectal prolapse after surgery remain unclear. Delorme’s procedure is often selected for relatively small-sized rectal prolapse, but there are few reports discussing the association between prolapsed rectum length and prolapse recurrence after Delorme’s procedure. We hypothesized that patients with longer rectal prolapses are at a higher risk of recurrence after Delorme’s procedure. Methods: The study population comprised patients with rectal prolapse who underwent Delorme’s procedure between January 2014 and December 2019 at Tokyo Yamate Medical Center. We extracted data on patient age, sex, body mass index, previous history of anal surgery, previous history of surgery for rectal prolapse, and length of prolapse, to identify risk factors for prolapse recurrence. Results: Altogether, 96 patients were eligible for analysis. The median length of the prolapsed rectum was 3.0 cm (range, 1.0–6.6 cm). Twenty-four patients (25.0%) experienced recurrence after Delorme’s procedure after a median of 7.5 months (interquartile range, 3.2–20.9 months). Multivariate analysis revealed that longer prolapsed rectum length increased the risk of recurrence after Delorme’s procedure (hazard ratio, 6.28; 95% confidence interval, 1.83–21.50; P<0.001). Conclusion: The length of the prolapsed rectum should be measured before Delorme’s procedure for rectal prolapse, because length is associated with a risk of recurrence after the surgery.
Zikrilla Bobamuratovich Alimov,Hyunwoo Youn,Ayumi Iwata,Kohei Nakano,Takuma Okamoto,Ayaha Sasaki,Takuya Katori,Tomoaki Okuda 한국대기환경학회 2022 Asian Journal of Atmospheric Environment (AJAE) Vol.16 No.3
Cyclone sampling devices have been helpful in assessing the toxic effects of fine particulate matter (PM2.5). The particle collection efficiency of sampling devices is critical. This study investigated the effect of cyclone size on particle size, chemical composition, and particle toxicity. Three cyclones with different inner diameters (12-68 mm) were tested for penetration using an aerodynamic particle sizer, fluorescent polystyrene latex, and a differential mobility analyzer. The elemental and water-soluble ion compositions of the particles collected by different cyclones were compared. An evaluation of the particles’ toxicity was conducted by comparing the results of dithiothreitol (DTT), limulus amebocyte lysate (LAL), and cell exposure assays. The experimental evaluation showed a 50% cut-size of the cyclones between 0.17-0.28, 0.34-0.36, and 0.70 μm for the small, medium, and large cyclones, respectively. To collect PM2.5 and evaluate separation performance in the real environment, the small and large cyclones were selected according to the particle penetration and flow rate. A comparison of chemical composition and enrichment factor values found that the particles in the small cyclone samples contained smaller and more anthropogenic sources than those in the large cyclone samples. The oxidative potential (OP) measured by the DTT assay of the samples collected using the small and large cyclones differed across sampling periods and associated with the transition metals. The viability of human epithelial A549 cells after exposure to the collected particles using the cyclones was different across sampling periods and associated with OP. The endotoxin concentrations measured in the LAL assay were found only in the large cyclone samples; they affected the estimated level of cytokine based on IL(interleukin)-6 release from human leukemia monocytic (THP-1) cells derived macrophage- like cells. Regardless of the size, the cyclone techniques used in this study to collect aerosol particles would be a powerful tool for a detailed evaluation of particle toxicity.