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Search Results: 1 - 10 of 1214 matches for " Katsunori Ishii "
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Evaluation of the Bending Loss of the Hollow Optical Fiber for Application of the Carbon Dioxide Laser to Endoscopic Therapy  [PDF]
Daisuke Kusakari, Hisanao Hazama, Rinna Kawaguchi, Katsunori Ishii, Kunio Awazu
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.34A003
Abstract:

Since carbon dioxide laser is excellent for incision, hemostasis, coagulation, and vaporization of soft tissues, it has been widely applied in clinical treatments as the laser knife. In these days, flexible thin hollow optical fibers transmitting mid-infrared light have been developed, and the application of carbon dioxide laser to endoscopic therapy has become possible. However, it is expected that the irradiation effect is influenced by the change in the laser power at the tip of the hollow optical fiber due to the change in the transmittance by the bending loss. The purpose of this research is to quantitatively evaluate the change in the output power and therapeutic effect by bending the hollow optical fiber in a gastrointestinal endoscope. The change in the transmittance of the hollow optical fiber due to the insertion of the fiber into the endoscope and bending of the head of the endoscope was measured. Then, the relationship between the irradiated laser power and the incision depth for a porcine stomach was investigated. As the results, the most significant decrease in the transmittance of the hollow optical fiber was caused by the insertion of the fiber into the instrument channel of the endoscope, and bending of the head of the endoscope with the angle of 90° decreased the output laser power and incision depth by 10% and 25%, respectively. Therefore, it was confirmed that the bending loss of the hollow optical fiber due to the bending of the head of the endoscope had no significant influence on the endoscopic therapy using the carbon dioxide laser.

Observation of Atherosclerotic Plaque Phantoms through Saline or Blood Layers by Near-Infrared Hyperspectral Imaging  [PDF]
Katsunori Ishii, Akiko Kitayabu, Ryo Nagao, Kunio Awazu
Optics and Photonics Journal (OPJ) , 2014, DOI: 10.4236/opj.2014.410026
Abstract: We observed atherosclerotic plaque phantoms using a novel near-infrared (NIR) hyperspectral imaging (HSI) technique. Data were obtained through saline or blood layers to simulate an angioscopic environment for the phantom. For the study, we developed a NIR-HSI system with an NIR supercontinuum light source and mercury-cadmium-telluride camera. Apparent spectral absorbance was obtained at wavelengths of 1150 - 2400 nm. Hyperspectral images of lipid were constructed using a spectral angle mapper algorithm. Bovine fat covered with saline or blood was observed using hyperspectral images at a wavelength around 1200 nm. Our results show that NIR-HSI is a promising angioscopic technique with the potential to identify lipid-rich plaques without clamping and saline injection.
Arbuscular Mycorrhizal Fungal Community Structure in Soybean Roots: Comparison between Kanagawa and Hokkaido, Japan  [PDF]
Katsunori Isobe, Kohei Maruyama, Singo Nagai, Masao Higo, Tomiya Maekawa, Gaku Mizonobe, Rhae A. Drijber, Ryuichi Ishii
Advances in Microbiology (AiM) , 2011, DOI: 10.4236/aim.2011.11003
Abstract: The objectives of this study were to determine arbuscular mycorrhizal fungi (AMF) community structure in colonized roots of soybean cultivated from Kanagawa and Hokkaido in Japan and to relate the community structure to environmental conditions, which included soil type, preceding crops, and soil chemical properties. The average number of AMF OTU (operational taxonomic unit) colonizing soybean roots collected from Kanagawa and Hokkaido was 11.2 and 5.8, respectively, a significant difference. Moreover, AMF from the family Gigasporasera was not identified in soybean roots collected from Hokkaido, suggesting that AMF in the family Gigasporasea is absent or rare in the soybean fields of sampled in Hokkaido. We postulate that the soil type, preceding crops or soil chemical properties are not the underlying factor differentiating AMF community structure colonizing in soybean roots between Kanagawa and Hokkaido. Instead we conclude that temperature and phosphate absorption coefficient are the determining factors of AMF OTU in this study.
Correlation between mood and heart rate variability indices during daily life  [PDF]
Kohzoh Yoshino, Katsunori Matsuoka
Health (Health) , 2011, DOI: 10.4236/health.2011.39094
Abstract: We investigated the correlation between mood and heart rate variability (HRV) indices during daily life. The RR-interval and body acceleration of 40 normal male subjects were recorded using ambulatory device for 48 to 72 hours. Every hour that the subjects were awake they registered their current mood on a Visual Analogue Scale questionnaire. The questionnaire scales eight of the subjects’ current moods. Those are happiness, tension, fatigue, worry, depression, anger, vigor, and confusion. The following four HRV indices were calculated. Those are heart rate, root mean square of successive differences of RR-interval sequence, the normalized high-frequency (0.15 - 0.4 Hz) power of RR-in- terval variability, and mean frequency in the high-frequency band of RR-interval variability. The calculated HRV indices data and the mood data were normalized individually, the data with body acceleration exceeding 30 mG were excluded from the analysis to reduce the effect of exercise, and the differences from the first day (?mood and ?HRV-index) were taken to reduce the effect of circadian rhythm. The most three highly correlated combinations were ?vigor and ?HFnu (R = –0.24, p < 0.0001), ?vigor and ?RMSSD (R = –0.24, p < 0.0001), and ?vigor and ?HR (R = 0.22, p < 0.001). Vigor exhibited the most significant correlations with HRV indices of eight moods.
Rain Attenuation at Terahertz  [PDF]
S. Ishii
Wireless Engineering and Technology (WET) , 2010, DOI: 10.4236/wet.2010.12014
Abstract: Rain attenuation values were calculated using empirical raindrop-size distributions, which were, Marshall-Palmer (M-P), Best, Polyakova-Shifrin (P-S) and Weibull raindrop-size distributions, and also calculated using a specific rain attenuation model for prediction methods recommended by ITU-R. Measurements of Terahertz wave taken at 313 GHz (0.96 mm) were compared with our calculations. Results showed that the propagation experiment was in very good agreement with a calculation from the specific attenuation model for use in prediction methods by ITU-R.
Product R&D Rivalry and Quality Policy in an International Industry Composed of Firms from Capitalist and Post-Communist Countries  [PDF]
Yasunori Ishii
Open Journal of Political Science (OJPS) , 2018, DOI: 10.4236/ojps.2018.83021
Abstract: Modeling an international mixed duopoly composed of a private firm from a capitalist country (CC), and a state firm from a post-communist country (PCC) that choose outputs and product qualities under quality policies of their governments, we analyze the firms’ output-quality rivalry and the governments’ quality policies. We find that when the PCC’s state firm is partially or perfectly privatized, an increase in the quality subsidy of each country raises its firm’s output, product quality and market share, but decreases those of its rival firm, and both the quality policies of the CC and PCC are the subsidy policies. However, when the PCC’s state firm is completely nationalized, while a change in the quality subsidy of the CC has the similar effects as those mentioned above, a change in the quality subsidy of the PCC has no effect on the firms’ outputs, product qualities and market shares, which means that the optimal quality policy of the CC is the subsidy policy, but that of the PCC is to do nothing.
Quality Rivalry in an Industry Composed of Private and Public Firms under Privatization  [PDF]
Yasunori Ishii
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.67003
Abstract: Modeling a duopoly in which a private firm and a public firm endogenously decide their product qualities and outputs under a privatization policy of a public firm by government, we analyze relationships between the privatization degree of the public firm and firms’ product quality choices. For establishing a more actual model we adopt more generalized demand functions including firms’ product qualities as variables. We find that a rise in the privatization degree of the public firm lowers the public firm’s product quality, whilst it raises the private firm’s one. We also show that the product quality of the public firm is not always inferior to that of the private firm, depending on their production and product quality technologies. Furthermore, we demonstrate that when the firms’ production and product quality technologies are identical to each other, the product quality of the public firm is always superior to that of the private firm.
Obituary: Yukio Mano (1943–2004)
Katsunori Ikoma
Journal of NeuroEngineering and Rehabilitation , 2005, DOI: 10.1186/1743-0003-2-1
Abstract: Associate Editor, Journal of NeuroEngineering and RehabilitationI was terribly shocked to hear of the tragic and sudden passing of Yukio Mano on November 7, 2004, at the age of 61. He had not been well this past year but had been working continuously until just ten days before his death.Yukio Mano (Figure 1) was born on August 26, 1943 in Aichi Prefecture, Japan. He studied medicine at Nagoya University School of Medicine, and graduated in 1968. After he completed his basic medical training in Japan, he began his medical career in the USA in 1972. He first worked as a resident at the Institute of Rehabilitation Medicine at New York University for two years, then in 1974 he moved to the Department of Neurology at Baylor College of Medicine working as an assistant instructor and resident for one year. In 1975, he became a research fellow at the University of Maryland School of Medicine, in the Neuromuscular Research Unit. Yukio Mano studied the most advanced techniques in the fields of rehabilitation medicine and neurology during his four-year stay in the USA. Upon returning to Japan in 1976, he resumed his research in rehabilitation medicine at Nagoya University and the National Center of Neurology and Psychiatry, Japan. In 1981, he became an associate professor in the Department of Neurology at Nara Medical University. He was responsible for running the rehabilitation department there as a specialist in rehabilitation medicine. Finally, he was granted a full professorship in Rehabilitation and Physical Medicine at Hokkaido University (Graduate) School of Medicine in 1995. Yukio Mano was committed to helping researchers studying rehabilitation medicine, as well as young medical doctors and therapists in the rehabilitation field. He extensively expanded the Rehabilitation Department of Hokkaido University, and my colleagues and I had expected his leadership to continue into the future.His research interest was rehabilitation medicine, especially brain plasticity. He w
Forgotten and unattended: refugees in post-earthquake Japan
Katsunori Koike
Forced Migration Review , 2011,
Abstract: Despite being a world leader in disaster preparedness, Japan paid scant attention to the needs of one of its most marginalised social groups after the 2011 earthquake.
Fulde-Ferrell-Larkin-Ovchinnikov State in the absence of a Magnetic Field
Katsunori Kubo
Physics , 2008, DOI: 10.1143/JPSJ.77.043702
Abstract: We propose that in a system with pocket Fermi surfaces, a pairing state with a finite total momentum q_tot like the Fulde-Ferrell-Larkin-Ovchinnikov state can be stabilized even without a magnetic field. When a pair is composed of electrons on a pocket Fermi surface whose center is not located at Gamma point, the pair inevitably has finite q_tot. To investigate this possibility, we consider a two-orbital model on a square lattice that can realize pocket Fermi surfaces and we apply fluctuation exchange approximation. Then, by changing the electron number n per site, we indeed find that such superconducting states with finite q_tot are stabilized when the system has pocket Fermi surfaces.
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