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Products of differentiation and composition on Bloch spaces
Shuichi Ohno 대한수학회 2009 대한수학회보 Vol.46 No.6
We will consider the questions of when the products of composition and differentiation are bounded and compact on Bloch and little Bloch spaces. We will consider the questions of when the products of composition and differentiation are bounded and compact on Bloch and little Bloch spaces.
A Fast Rendering Method for Water Droplets on Glass Surfaces
Shuichi Takenaka,Yoshiki Mizukami,Katsumi Tadamura 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This study proposes a fast rendering method for water droplets on glass surfaces, where the merger phenomenon between two droplets at non-adjacent cells is represented by detecting the collision of their contours and moving them closer into a single water droplet after the collision detection. The appearance of water droplets is efficiently rendered with an environmental mapping technique, a generating method of texture images using the framebuffer object function, and plotting these images using the point sprite function.
Shuichi Emura,Masanobu Nunogaki,Yoshiyuki Nakata 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.3
Surfaces of metallic Ti have been modified successfully to thick layers of metalceramic, TiC, by reactive plasma processing. The carbonized surfaces consist of mixed layers of TiC and metallic Ti. TiC grains grow up on the Ti substrate with island forms. The metal Ti acts as a “paste” between the growing TiC grains. The hardness of the modified surface layers increases with processing temperature. The hardness reaches 5000 kg/mm2 at a processing temperature of about 1300 oC, which is a value comparable to bulk TiC. Analysis of the XAFS spectrum and the diffraction profiles for the fabricated layers shows a reduction of the Ti-Ti distance from a distance of 3.07 Å for the bulk TiC to 3.025 Å. Using the results of the local structures around a Ti element by XAFS analysis, we will try to elucidate the abnormal hardness of the newly fabricated TiC by an analytical model. Surfaces of metallic Ti have been modified successfully to thick layers of metalceramic, TiC, by reactive plasma processing. The carbonized surfaces consist of mixed layers of TiC and metallic Ti. TiC grains grow up on the Ti substrate with island forms. The metal Ti acts as a “paste” between the growing TiC grains. The hardness of the modified surface layers increases with processing temperature. The hardness reaches 5000 kg/mm2 at a processing temperature of about 1300 oC, which is a value comparable to bulk TiC. Analysis of the XAFS spectrum and the diffraction profiles for the fabricated layers shows a reduction of the Ti-Ti distance from a distance of 3.07 Å for the bulk TiC to 3.025 Å. Using the results of the local structures around a Ti element by XAFS analysis, we will try to elucidate the abnormal hardness of the newly fabricated TiC by an analytical model.
Modeling of the Flow-Reversal Process in a Density Oscilator
Shuichi Kinoshita,Takeshi Kano 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The density oscillator is known to be a simple model system that exhibits self-sustained oscillation. In a previous study, we have shown that the flow-reversal process is clearly viscosity-dependent and have proposed a model that describes the viscosity-dependent process. In the present paper, we refine the previous model and describe the dynamical behaviors of the density oscillator by using simple differential equations with non-dimensionalized formulations. The refined model is generally in good agreement with the experimental results for fluids with various viscosities.
Experimental Study on Thermal Transport Phenomenon of Nanofluids as Working Fluid in Heat Exchanger
SHUICHI TORII 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.1
This paper aims to study the convective heat transfer behavior of aqueous suspensions ofnanoparticles flowing through a horizontal tube heated under constant heat flux condition. Consideration is given to the effects of particle concentration and Reynolds number on heattransfer enhancement and the possibility of nanofluids as the working fluid in various heatexchangers. It is found that (i) significant enhancement of heat transfer performance due tosuspension of nanoparticles in the circular tube flow is observed in comparison with pure water asthe working fluid, (ii) enhancement is intensified with an increase in the Reynolds number andthe nanoparticles concentration, and (iii) substantial amplification of heat transfer performanceis not attributed purely to the enhancement of thermal conductivity due to suspension ofnanoparticles.
Shuichi Morizane,Hubert Stein,Takayuki Komiya,Hiroyuki Kaneta,Atsushi Takenaka 대한비뇨의학회 2023 Investigative and Clinical Urology Vol.64 No.4
Purpose: To investigate the feasibility and optimal port placements of robot-assisted laparoscopic nephroureterectomy (RANU) via the retroperitoneal approach in the lateral decubitus and supine positions using the da Vinci Xi (DVXi) and da Vinci SP (DVSP) systems. Materials and Methods: We performed lateral decubitus extraperitoneal RANU on the right side and supine extraperitoneal RANU on the left side using the DVXi and DVSP systems without repositioning in two fresh cadavers. In addition, paracaval and pelvic lymphadenectomies were performed simultaneously during both surgical procedures. The operative time of each procedure was calculated, and the technical details associated with these procedures were evaluated. Results: Lateral decubitus and supine extraperitoneal RANU using the DVXi and DVSP systems were achieved without repositioning. The surgeon console time ranged from 89 to 178 minutes, and no major technical complications were observed. However, carbon dioxide insufflation into the abdominal cavity was observed owing to a peritoneal breach during the creation of the surgical workspace, particularly in the supine position. Compared with the DVXi system, the DVSP system was more suitable for RANU using the retroperitoneal approach, except for renal handling. Conclusions: The DVXi and DVSP systems are feasible for performing lateral decubitus and supine extraperitoneal RANU without patient repositioning. The lateral decubitus position may be better than the supine position, and the DVSP system is more suitable for retroperitoneal RANU than the DVXi system. Nevertheless, further studies should be performed in clinical settings to validate our results.