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Yuki Hishinuma,Hiroaki Tezuka,Takao Nishitani 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper describes a hierarchical unified parameter generation on fine-to-coarse multi-resolution foreground segmentation based on Gaussian mixture model (GMM). The hierarchical parameter generation can reduce the required update processing amount by half in the coarse processing area, without serious performance degradation on high resolution video pictures. The GMM approach over Walsh transform domain in every resolution processing is modified to a set of finer resolution layers by the GMM approaches, followed by the remaining set of coarse resolution layers using single Gaussian models which employ the unified parameters generation scheme. The unified parameter generation is based on the reproducing property of Gaussian distributions used for GMM parameters in the last GMM layer. Experimental results show almost the same stable performance of the fine-to-coarse GMM in outdoor conditions.
MIXING CONDITIONS WITH SPRAY-JET INTERACTION FOR EFFECTIVE SOOT REDUCTION IN DIESEL COMBUSTION
Chikahisa, Takemi,Hishinuma, Yukio,Ushida, Hirohisa The Korean Society of Automotive Engineers 2002 International journal of automotive technology Vol.3 No.1
The authors have reported significant reductions in particulate emissions of diesel engines by generating strong turbulence during the combustion process. This study aims to identify optimum conditions of turbulent mixing for effective soot reduction during combustion. The experiments were conducted with a constant volume combustion vessel equipped with abet-generating cell, in which a small amount of fuel is injected during the combustion of the main spray. The jet of burned gas from the cell impinges the main flame, causing changes In the mixing of fuel and air. Observation was made for a variety combinations of distances between spray nozzle and Jet orifice at different directions of impingement. It Is shown that compared with the case without Jet flame soot decreases when the jet impinges. When the jet is very close to the flame, it penetrates the soot cloud and causes little mixing. There were no apparent differences in the combustion duration when the direction of impingement was varied, although the mechanisms of soot reduction seemed different. An analysis of local turbulent flews with PIV (Particle image Velocimetry) showed the relationship between the scale of the turbulence and the size of the soot cloud.
KI, WOO-KYUNG,HISHINUMA, FUMIO,CHO, YONG-UN 경상대학교 유전공학연구소 1985 遺傳工學硏究所報 Vol.4 No.-
Two linear DNA killer plasmids from Kluyveromyces lactis were transfered into four kinds of secretion mutant derived from Saccharomyces cerevisiae(a,suc2, mal, gal2, cup1, rho) by cell fusions. Out of 286 colonies regenerated on selective medium, two strains derived from sec 7 and sec 1, three strains from sec 18, and two strains from sec 53 were identified harboring two killer plasmids by killer test and electro phoretic analysis of plasmids.
Designing Picture Book of the Body for 5-6 Year Olds: Teaching Basic Knowledge about Health
Katsura Goto,Michiko Hishinuma,Kazuo Shiraki,Miwako Matsutani,Nobuko Ookubo,Yumi Sakyo,Hisako Nakayama,Akiko Ishimoto,Naoko Arimori,Yoshimi Yamazaki,Kyoko Iwanabe,Takako Shimada,Yasuko Mitsumori,Atsuk 한국간호과학회 2007 한국간호과학회 학술대회 Vol.2007 No.11
Deformation Twinning in TiAl : Effects of Defect Clustering
Yoo, M H,HISHINUMA, A 대한금속재료학회(대한금속학회) 1997 METALS AND MATERIALS International Vol.3 No.2
Possible roles of point defect clustering in the formation of deformation twins in γ-TiAl are critically assessed by reviewing the available models of dislocation-assisted twin nucleation and experimental data on deformation twinning in Ti-56 at.% Al single crystals and two-phase Ti-47 at.% Al alloys. According to the pole mechanism for twinning in the Ll_0 structure, a reasonable combination of the stress concentration (n=27) and the vacancy supersaturation (c/c_0=13) is needed to overcome the critical stages of twin formation. The so-called radiation-induced ductility reported in Ti-47 at.% Al alloys is attributed to the effective formation of twin embryos in the presence of interstitial-type Frank loops and the subsequent nucleation and growth of twins during plastic deformation.
MIXING CONDITIONS WITH SPRAY-JET INTERACTION FOR EFFECTIVE SOOT REDUCTION IN DIESEL COMBUSTION
Takemi Chikahisa,Yukio Hishinuma,Hirohisa Ushida 한국자동차공학회 2002 International journal of automotive technology Vol.3 No.1
The authors have reported significant reductions in particulate emissions of diesel engines by generating strong turbulence during the combustion process. This study aims to identify optimum conditions of turbulent mixing for effective soot reduction during combustion. The experiments were conducted with a constant volume combustion vessel equipped with a jet-generating cell, in which a small amount of fuel is injected during the combustion of the main spray. The jet of burned gas from the cell impinges the main flame, causing changes in the mixing of fuel and air. Observation<br/> was made for a variety combinations of distances between spray nozzle and jet orifice at different directions of<br/> impingement. It is shown that compared with the case without jet flame soot decreases when the jet impinges. When the jet is very close to the flame, it penetrates the soot cloud and causes little mixing. There were no apparent differences in the combustion duration when the direction of impingement was varied, although the mechanisms of soot reduction seemed different. An analysis of local turbulent flows with PIV (Particle Image Velocimetry) showed the relationship between the scale of the turbulence and the size of the soot cloud.<br/>
Avalanche-like Quenches in Cable in Conduit Conductors
Kazutaka Seo,Arata Nishimura,Yoshimitsu Hishinuma 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Superconducting conductors carrying large currents of more than several tens of kA are required for magnetic confinement fusion apparatuses. A cable-in-conduit conductor (CICC), which has around a thousand parallel and twisted thin superconducting strands in a stiff conduit, is a promising candidate for such large and high-magnetic-field superconducting systems. We developed a numerical code AQUAPS (Avalanche-like QUench Analysis for Parallel Superconducting strands) simulating electromagnetic and thermal phenomena in a conductor consisting of parallel superconducting strands. A specific phenomenon in the CICC is so-called avalanche-like quench. When one strand becomes resistive due to current saturation or a mechanical disturbance, e.g. frictional heating, it loses the transport current and the current re-distributes into neighboring strands. Neighboring strands are electromagnetically well coupled and electrically contact each other. Therefore, neighboring strands receive supplemental current from the original strand and this results in a following quench. We call this phenomenon ’avalanche-like quench’. With the newly developed numerical code AQUAPS, we have simulated quenches in multi-strand cables with both Nb3Sn and NbTi strands and compared these. For the Nb3Sn cable, the critical temperature (Tc) may be much larger than the liquid-helium bath temperature (T0), in spite of the fact that current sharing temperature (Tcs) is almost equal to T0. This situation is very different from that in the NbTi cable. We analyzed this issue intensively and present some discussion.0chh9mu
Fadel Elseed, A.M.A.,Sekine, J.,Hishinuma, M.,Hamana, K. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.3
This experiment was conducted to examine the effects on the composition and rumen degradation in sacco of rice straw treated with animal urine (1 l of 2.9 g N/kg DM straw) and urea plus calcium hydroxide (2% urea plus 0.5% $Ca(OH)_2$/kg DM straw) as a cheap and relatively safe alternative for ammonia (3% ammonia solution/kg DM straw). Mold occurred in urine treated straw, but other treatments were apparently mold-free. All treatments significantly (p<0.05) increased CP content in the straw compared with untreated one. Ammonia-treated straw contained CP at about twice that in urine or urea-calcium hydroxide treated straw. NDF and hemicellulose contents decreased significantly (p<0.05) in all treatments, while ADF and cellulose showed no differences compared with untreated straw. The degradable fraction of DM, CP, NDF, hemicellulose and cellulose was significantly (p<0.05) increased for ammonia and urea-calcium hydroxide treatments than for urine treated or untreated straw except for CP of urine treated straw. Chemical treatment of rice straw increased the readily degradable fraction of CP, while it decreased the slowly degradable fraction for urine or urea-calcium hydroxide treated rice straw. The degradation rate of hemicellulose was significantly (p<0.05) increased for ammonia and urea-calcium hydroxide treatments compared to urine treated or untreated straw. However, no effect on cellulose degradation rate was found by any of the treatments. There was no improvement in the degradation kinetics caused by the urine treatment despite the improvement of the chemical composition. Although the improvement in rumen degradability was less in the urea-calcium hydroxide treatment than in the ammonia treatment, its use may be more desirable because it is less expensive to obtain, less hazardous nature, and readily available. For further improvement it is necessary to investigate the supplementation of slowly degradable nitrogen to ureacalcium hydroxide treated rice straw diet.