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Search Results: 1 - 10 of 1470 matches for " Yuki Tsuji "
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Socially Anxious Tendencies Affect Autonomic Responses during Eye Gaze Perception  [PDF]
Yuki Tsuji, Sotaro Shimada
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.613160
Abstract: Social anxiety disorder is a common psychiatric disorder. The gaze of others is known to frequently induce social anxiety. We conducted a gaze detection experiment to examine the effects of social anxiety on autonomic response, namely heart rate (HR) response. We used the maximum HR deceleration between 0 s and 3 s after stimulus onset as an indicator of emotional stress. Participants were assigned to a high social anxiety (HSA) or low social anxiety (LSA) group on the basis of cut-off scores indicative of clinical levels of stress as per the Japanese version of the Liebowitz Social Anxiety Scale (LSAS-J). Our results showed that HR deceleration was greater for the HSA compared with the LSA group. Moreover, the higher the LSAS-J score was, the greater the increase was in HR deceleration (correlation coefficient rs = 0.52, p < 0.01). Our results suggest that the eye gaze of others can be processed as a threat in individuals with a high tendency towards social anxiety.
Exploring the Priced Factors in ICAPM in Japan  [PDF]
Chikashi TSUJI
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.24078
Abstract: This paper investigates the priced factors in the Intertemporal Capital Asset Pricing Model (ICAPM) in the Tokyo Stock Exchange (TSE) in Japan. Focusing on the time-varying covariance risks derived by the multivariate Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model, we find new priced state variables in Japan. That is, our empirical tests reveal that in the TSE, the time-varying covariance between market return and illiquidity measure and that between market return and the log change of the seasonally adjusted industrial production are statistically significantly priced state variables in the ICAPM.
Stock Return Conjunction in Markets with Deteriorated Sentiment: Evidence from the Japanese Electric Appliances Industry  [PDF]
Chikashi Tsuji
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.34060
Abstract: This paper aims to clarify the characteristics of stock return dynamics when investor sentiment is deteriorated in equity markets. Further, prior to our empirical analysis, we newly develop the measures of return conjunction and the exponentially weighted correlation coefficient. Namely, our contributions are as follows. First, this paper clarifies the fact that when market sentiment is deteriorated, stock returns present conjunctional behavior. Second, for our empirical analysis, we newly develop two kinds of conjunction measures of stock returns. Third, we also develop the exponentially weighted correlation coefficient measure referring to the exponentially weighted volatility suggested by J.P. Morgan. This correlation measure is a useful tool because it captures forward-looking correlation without difficulty caused by model estimation.
Value Premium and Portfolio Return Regime: Evidence from European Equities  [PDF]
Chikashi Tsuji
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.93028
Abstract: This paper examines the profitability of four European higher return stock portfolios and their linkages between the value premium factor return, high-minus-low (HML), developed by Fama and French. Our fundamental analyses and quantitative examinations using Markov switching models derive the following findings. First, in the four higher return stock portfolios in Europe, the smallest and the highest momentum portfolio shows the highest return. Second, the second smallest and the highest book-to-market (BM) portfolio, the second smallest and the highest operating profitability portfolio, and the second smallest and the second lowest investment portfolio for Europe also demonstrate higher excess returns than the overall stock market in Europe. Furthermore, we also clarify that for all the four European stock portfolios, there clearly exist two regimes: one is positively associated with the value premium factor return, HML, and the other is negatively associated with HML. We further reveal that recently, for all the four portfolios, the high value premium factor loading regimes shift to the other regimes that are uncorrelated with HML. This indicates that, in the recent periods, hedging and risk-diversification effects can be recognized in investing value stocks and the four higher return stock portfolios in Europe.
How Are Structural Breaks Related to Stock Return Volatility Persistence? Evidence from China and Japan  [PDF]
Chikashi Tsuji
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.910102
Abstract: This study empirically examines the effects of structural breaks on equity return volatility persistence by using Chinese and Japanese equity index return data. Applying standard GARCH models and two kinds of structural break dummy variables, we derive the following findings. First, we reveal that for both Chinese and Japanese equity index returns, the values of GARCH parameters of standard GARCH models decline when the first structural break dummies are incorporated. Second, our analyses further clarify that for both Chinese and Japanese equity index returns, the values of GARCH parameters of standard GARCH models again decline when different kinds of structural break dummies are incorporated.
Two New Monoterpene Glycosides from Qing Shan Lu Shui Tea with Inhibitory Effects on Leukocyte-Type 12-Lipoxygenase Activity
Hideyuki Ito,Akemi Otsuki,Hitomi Mori,Peng Li,Mai Kinoshita,Yuki Kawakami,Hideaki Tsuji,Ding Zhi Fang,Yoshitaka Takahashi
Molecules , 2013, DOI: 10.3390/molecules18044257
Abstract: We evaluated the inhibitory effect of 12 Chinese teas on leukocyte-type 12-lipoxygenase (LOX) activity. Tea catechins such as epigallocatechin gallate have been known to exhibit leukocyte-type 12-LOX inhibition. Qing Shan Lu Shui, which contains lower catechin levels than the other tested teas, suppressed leukocyte-type 12-LOX activity. To characterize the bioactive components of Qing Shan Lu Shui, leukocyte-type 12-LOX inhibitory activity–guided fractionation of the aqueous ethanol extract of the tea was performed, resulting in the isolation of two new monoterpene glycosides: liguroside A ( 1) and B ( 2). The structures of compounds 1 and 2 were characterized as (2 E,5 E)-7-hydroperoxy-3,7-dimethyl-2,5-octadienyl- O-(α-L-rhamnopyranosyl)-(1″→3′)-(4′″- O- trans- p-coumaroyl)-β-D-glucopyranoside and (2 E,5 E)-7-hydroperoxy-3,7-dimethyl-2,5-octa-dienyl- O-(α-L-rhamnopyranosyl)-(1″→3′)-(4′″- O- cis- p-coumaroyl)-β-D-glucopyranoside, respectively, based on spectral and chemical evidence. Ligurosides A ( 1) and B ( 2) showed inhibitory effects on leukocyte-type 12-LOX activity, with IC 50 values of 1.7 and 0.7 μM, respectively.
An Empirical Investigation of Common Sense of Land Use from a Statistical Approach  [PDF]
Yuki Hanashima
Journal of Geographic Information System (JGIS) , 2012, DOI: 10.4236/jgis.2012.42014
Abstract: Recently, ontological study has been one of the key concerns of geographic information science, a number of studies have been conducted in both of philosophical and knowledge engineering approach. Some studies pointed out the importance of human cognition and social context for development of ontologies. This paper presents empirical investigation of common sense of land use categories for development of suitable ontologies for each cultural or speech communities. Distinctions and characteristics in perceiving land use categories were described by a psychological method that was submitted to Japanese graduate and undergraduate students. In addition the results were analyzed using corresponddence analysis, a statistical technique for categorical data. This analysis serves to clarify the dominant determining factors for land use categories.
Identification of the Bacterial Gene in Patients Who Repeatedly Develop Streptococcal Pharyngitis  [PDF]
Yuichiro Tsuji, Ichihashi Izumi
International Journal of Clinical Medicine (IJCM) , 2012, DOI: 10.4236/ijcm.2012.37121
Abstract:

Background: We aimed at determining whether the pathogenic bacteria at the onset of disease are genetically different and whether this affects future choice of the therapeutic methods against group A β-hemolytic streptococcal acute pharyngitis/tonsillitis. Methods: A pharynx swab was collected from pediatric patients who visited our hospital. The swab was cultured, and hemolytic streptococcus was detected 230 times. We isolated pathogenic bacteria of patients infected more than once and examined the bacteria using pulse-field gel electrophoresis. Results: Based on gene search results, we found that if the period of developing relapse was within 1 month from the first infection, all patients had the same gene. However, all patients in whom reinfection occurred after 6 months or later had different pertinent genes. Conclusions: The number of relapse/reinfection is significant for this disease, and considerably caution is essential for its treatment. No changes to antibacterial drug administration may be necessary for the second administration unless more than 6 months have passed since the first infection.

Successful Treatment of PFAPA (Periodic Fever, Aphthous Stomatitis, Pharyngitis, and Adenitis) Syndrome with Shinbuto*  [PDF]
Yuichirou Tsuji, Chitose Karasawa
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.520160
Abstract: Periodic fever with aphthous stomatitis, pharyngitis, and adenitis (PFAPA) syndrome is an autoimmune disorder and the most common disorder characterized by periodic fever in children. A male patient has been followed up from 11 months to 10 years of age because of repeated high fever. We prescribed antifebriles and antibiotics for each febrile episode without a beneficial effect to him each time. He required several days of rest at home to recover from each episode. During his most recent febrile episode at 10 years of age, we prescribed 5.0 g of shinbuto (TJ-30; Tsumura Co., Tokyo, Japan). His fever resolved the next day and he was able to attend school. His growth and development are normal. Shinbuto had a therapeutic effect in this patient with PFAPA syndrome and may be useful in this condition.
Serum Antibody Titers of Measles and Rubella among Japanese Children  [PDF]
Yuichirou Tsuji, Chitose Karasawa
World Journal of Vaccines (WJV) , 2015, DOI: 10.4236/wjv.2015.54017
Abstract: Background: The rubella outbreak in Japan has not yet been eliminated. In particular, an outbreak of congenital rubella syndrome has recently become a public health problem in Japan. The World Health Organization has set an elimination target of 2015 for measles in Japan. However, an outbreak of measles occurred in Japan between 2007 and 2008. Starting in April 2006, the measles and rubella vaccines were administered twice, once when a child reached 1 year old and once when the child was 5 - 6 years old (just before starting elementary school). Between October of 1978 and 2006, children were vaccinated only once for measles and rubella. Design: During the study enrollment period (2011-2013), the serum antibody titers of measles and rubella were measured in pediatric patients (n = 163) in the Tokyo Takanawa Hospital. Results: The prevalence rates of the two diseases indicated that only one vaccination was insufficient to protect against infection. Conclusions: Our studies have determined that it was important to vaccinate children twice for measles and rubella during early infancy.
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