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Search Results: 1 - 10 of 2200 matches for " Kohgi Kato "
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Analysis of Langmuir Probe Characteristics for Measurement of Plasma Parameters in RF Discharge Plasmas  [PDF]
Kohgi Kato, Satoru Iizuka
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.49185
Abstract: A simple method for measuring RF plasma parameters by means of a DC-biased Langmuir probe is developed. The object of this paper is to ensure the reliability of this method by using the other methods with different principles. First, Langmuir probe current \"\"response on RF voltage \"\" superimposed to DC \"\" biased probe was examined in DC plasmas. Next, probe current response of DC biased probe in RF plasmas was studied and compared with the first experiment. The results were confirmed by using an emissive prove method, an ion acoustic wave method, and a square pulse response method. The method using a simple Langmuir probe is useful and convenient for measuring electron temperature \"\" , electron density \"\" , time-averaged space potential \"\" , and amplitude of space potential oscillation \"\" in RF plasmas with a frequency of the order of \"\" .
Web Search Query Privacy, an End-User Perspective  [PDF]
Kato Mivule
Journal of Information Security (JIS) , 2017, DOI: 10.4236/jis.2017.81005
Abstract: While search engines have become vital tools for searching information on the Internet, privacy issues remain a growing concern due to the technological abilities of search engines to retain user search logs. Although such capabilities might provide enhanced personalized search results, the confidentiality of user intent remains uncertain. Even with web search query obfuscation techniques, another challenge remains, namely, reusing the same obfuscation methods is problematic, given that search engines have enormous computation and storage resources for query disambiguation. A number of web search query privacy procedures involve the cooperation of the search engine, a non-trusted entity in such cases, making query obfuscation even more challenging. In this study, we provide a review on how search engines work in regards to web search queries and user intent. Secondly, this study reviews material in a manner accessible to those outside computer science with the intent to introduce knowledge of web search engines to enable non-computer scientists to approach web search query privacy innovatively. As a contribution, we identify and highlight areas open for further investigative and innovative research in regards to end-user personalized web search privacy—that is methods that can be executed on the user side without third party involvement such as, search engines. The goal is to motivate future web search obfuscation heuristics that give users control over their personal search privacy.
Asymptotic Analysis for Spectral Risk Measures Parameterized by Confidence Level  [PDF]
Takashi Kato
Journal of Mathematical Finance (JMF) , 2018, DOI: 10.4236/jmf.2018.81015
Abstract: We study the asymptotic behavior of the difference \"\" as \"\", where \"\" is a risk measure equipped with a confidence level parameter \"\" , and where X and Y are non-negative random variables whose tail probability functions are regularly varying. The case where is the value-at-risk (VaR) at α, is treated in [1]. This paper investigates the case where \"\" is a spectral risk measure that converges to the worst-case risk measure as \"\" . We give the asymptotic behavior of the difference between the marginal risk contribution \"\" and the Euler contribution \"\" of Y to the portfolio X+Y . Similarly to [1], our results depend primarily on the relative magnitudes of the thicknesses of the tails of X and Y. Especially, we find that \"\" is asymptotically equivalent to the expectation (expected loss) of Y if the tail of Y is sufficiently thinner than that of X. Moreover, we obtain the asymptotic relationship \"\" as \"\", where \"\" is a constant whose value likewise changes according to the relative magnitudes of the thicknesses of the tails of X and Y. We also conducted a numerical experiment, finding that when the tail of X is sufficiently thicker than that of Y, \"\" does not increase monotonically with α and takes a maximum at a confidence level strictly less than 1.
Contribution of CD3 ε Epitope and Oxidative Type of Copper-Zinc Superoxide Dismutase to the Degeneration Processes of Cerebellar Purkinje Cells in Patients with Multiple System Atrophy-Cerebellar Type (MSA-C: Olivopontocerebellar Atrophy, OPCA): An Immunohistochemical Study  [PDF]
Masako Kato, Shinsuke Kato, Kiyota Kato, Kazuhiko Hayashi
World Journal of Neuroscience (WJNS) , 2016, DOI: 10.4236/wjns.2016.64034
Abstract: Objective: This study aimed to investigate the contribution of CD3 epsilon (ε) epitope and oxidative type of copper-zinc superoxide dismutase to the degeneration processes of cerebellar Purkinje cells in patients with Multiple System Atrophy-Cerebellar type (MSA-C). Methods: This retrospective study was carried out on autopsy specimens of 17 patients with sporadic MSA-C and 10 normal individuals. Paraffin sections of autopsied cerebella and pontes were immunostained with polyclonal antibodies against CD3 ε epitope and oxidative modification to cysteine sulfonic acid of cys111 in human copper-zinc superoxide dismutase (Ox-SOD1). With respect to the areas of CD3-ε-epitope expression, the immunohistochemical study and the quantitative statistical analysis between the areas of CD3-ε-epitope expression in the surviving Purkinje cells of MSA-C patients and their disease duration were performed. Results: The cell bodies and dendritic arborization including primary, secondary, and tertiary dendrites of normal Purkinje cells were intensely immunostained by the antibody against CD3 ε epitope. Both the immunohistochemical study and the quantitative statistical analysis revealed that the areas positive for CD3 ε epitope disappeared in the order from tertiary dendrites, secondary dendrites, primary dendrites toward the cell bodies, along with the disease progression. In addition, Glial Cytoplasmic Inclusions (GCIs) and Neuronal Cytoplasmic Inclusions (NCIs) were strongly positive for CD3 ε epitope. The surviving Purkinje cells in MSA-C showed immunostaining by the anti-Ox-SOD1 antibody, although normal Purkinje cells did not. Conclusion: Based on the oxidative stress that the surviving Purkinje cells
Efficient Protein Refolding Using Surfactants at High Final Protein Concentration  [PDF]
Hidetaka Noritomi, Yoshiyuki Kato, Satoru Kato
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2014, DOI: 10.4236/jsemat.2014.41002

The refolding of denatured hen egg white lysozyme (HEWL) was examined by surfactants at a high final refolded HEWL concentration (1 mg/mL). Hexadecyltrimethylammonium bromide (CTAB) and sucrose fatty acid monoester (DK-SS) were used to dissolve denatured HEWL without denaturants such as guanidine hydrochloride (GuHCl) and urea. When denatured HEWL was perfectly dissolved in buffer solutions containing surfactants and dithiothreitol (DTT), the concentration of CTAB was about one-twentieth times less than that of DK-SS. The concentration of CTAB strongly affected the refolding yield, and the maximum refolding yield was obtained at 0.88 mM CTAB, which is around the critical micelle concentration of CTAB. The refolding yield was influenced by the molar ratio of oxidized glutathione (GSSG) to DTT, and the maximum refolding yield was obtained when [GSSG]/[DTT] was 1.5. The refolding yield was markedly dependent upon the solution pH of HEWL, and exhibited 80% at pH 5.2.

Relationship between Taste Sensitivity and Eating Style in Japanese Female University Students  [PDF]
Yoshiko Kato, Roswith Roth
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.33044
Abstract: This study investigated the relationship between taste sensitivity, the frequency and the preference for eating foods rich in zinc, dietary habits, and restrained eating among Japanese female undergraduate students. Forty-three subjects be-tween the ages of 20 and 22 participated in this study. After a taste-sensitivity test for sweetness and saltiness the stu-dents completed a food list indicating the intake frequency and preference of foods rich in zinc and their eating habits. The students were divided into four groups: high salt-taste sensitivity (SA-HG), low salt-taste sensitivity (SA-LG), high sweet-taste sensitivity (SW-HG), and low sweet-taste sensitivity (SW-LG). Individuals in the SA-HG group ate more foods rich in zinc and were more concerned with their health than those in the SA-LG group. Further, the SW-LG group ate more convenience foods than the SW-HG group. High salt-taste sensitivity could be predicted by eating more but less preference of foods rich in zinc, less snacking, and greater regularity of meals. On the other hand there is a signifi-cant positive relationship between the frequencies of eating and preference for foods rich in zinc. This means the results were inconsistent, further research is needed to clarify this point.
Reading Aloud Performance and Listening Ability in an L2: The Case of College-Level Japanese EFL Users  [PDF]
Shigeo Kato, Kento Tanaka
Open Journal of Modern Linguistics (OJML) , 2015, DOI: 10.4236/ojml.2015.52015
Abstract: Recent advance in neuropsychology has evidenced a facilitative role of sensorimotor activity for the development in L2 speech perception. The study attempted to examine the relationship between reading aloud (RA) performance, grammatical knowledge and listening ability with 31 college-level Japanese EFL users. The result demonstrated highly significant correlations between all the variables, and the subsequent multiple regression analysis also indicated RA significantly accounting for listening. Supplementary analyses dividing the participants by listening ability demonstrated that while significant correlation was maintained between L2 knowledge and listening with less-proficient listeners, it disappeared with proficient listeners; in contrast, significant correlation between RA and listening performance was maintained in both groups, indicating that production accuracy/fluency still played an important role in advanced L2 listening.
How Specialists Become Primary Care Physicians in Japan  [PDF]
Takuma Kato, Naoki Ikegami
Health (Health) , 2019, DOI: 10.4236/health.2019.113028
Abstract: Background: Most countries have a shortage of Primary Care (PC) physicians. Japan has mitigated this problem by specialists making a mid-career change to PC when they go into private practice. This study examines the circumstances under which specialists shift to PC. Methods: Since the division between specialists and PC physicians is blurred in Japan, we focus on Physicians Providing Home Visits (PPHV). The list of PPHV was obtained from the local medical associations in two neighboring medical planning areas in Japan. The methods used were a questionnaire and in-depth interviews. Results: Of the 46 listed as PPHV, 38 responded to the questionnaires. Physicians mainly acquired their knowledge and skills in primary care from post-graduate clinical training and on the job training after becoming PPHV. The specialists who had moved to PC were equally knowledgeable regarding PC as those had taken the PC accreditation exam. The in-depth interviews revealed that the higher income earned in clinics and being able to retain their identity as a specialist were also important factors. Conclusions: The factors that contributed to physicians making a mid-career change from specialists to PC were their experiences after being certified, the higher income in clinics and the ability to retain their professional identity as specialists. These enabling factors might also be applicable for increasing the ratio of PC physicians at the global level although further studies are required.
Kondo interactions in the CeOs4Sb12 skutterudite studied by inelastic neutron scattering

Yang Chang-Ping,Zhou Zhi-Hui,Wang Hao,K Iwasa,M Kohgi,
,周智辉,王 浩,K. Iwas,M. Kohgi

物理学报 , 2006,
Abstract: The energy gap near Fermi surface due to the hybridization of Ce3+ 4f1 and conduction electrons is the key to understand the physical properties of the CeOs4Sb12 compound, such as Kondo insulating behavior, moment quench of Ce3+ at low temperatures and the characteristics of heavy fermion. In this work, inelastic neutron scattering spectra of powder CeOs4Sb12 sample were collected at different temperatures using LAM-D neutron spectrometer at KEK pulsed neutron source. The result indicates that the CeOs4Sb12 skutterudite is a Kondo insulator with a c-f interaction of 3.1 meV. The Debye temperature is determined as 317 K.
Stripe orders in the extended Hubbard model
Taira Kato,Masaru Kato
Physics , 2000, DOI: 10.1143/JPSJ.69.3972
Abstract: We study stripe orders of charge and spin density waves in the extended Hubbard model with the nearest-neighbor Coulomb repulsion V within the mean field approximation. We obtain V vs. T(temperature) phase diagram for the on-site Coulomb interaction U/t=8.0 and the filling n=0.8, here t is a nearest-neighbor transfer energy. Our result shows that the diagonal stripe spin density wave state (SDW) is stable for small V, but for large V the most stable state changes to a charge density wave-antiferromagnetic (CDW-AF) state. Especially we find at low temperature and for a certain range of value of V, a vertical stripe CDW-AF state becomes stable.
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