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Search Results: 1 - 10 of 117961 matches for " T. Ohira "
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Predictors for benign paroxysmal positional vertigo with positive Dix–Hallpike test
Noda K, Ikusaka M, Ohira Y, Takada T, Tsukamoto T
International Journal of General Medicine , 2011, DOI: http://dx.doi.org/10.2147/IJGM.S27536
Abstract: edictors for benign paroxysmal positional vertigo with positive Dix–Hallpike test Original Research (2584) Total Article Views Authors: Noda K, Ikusaka M, Ohira Y, Takada T, Tsukamoto T Published Date December 2011 Volume 2011:4 Pages 809 - 814 DOI: http://dx.doi.org/10.2147/IJGM.S27536 Kazutaka Noda, Masatomi Ikusaka, Yoshiyuki Ohira, Toshihiko Takada, Tomoko Tsukamoto Department of General Medicine, Chiba University Hospital, Chiba, Japan Objective: Patient medical history is important for making a diagnosis of causes of dizziness, but there have been no studies on the diagnostic value of individual items in the history. This study was performed to identify and validate useful questions for suspecting a diagnosis of benign paroxysmal positional vertigo (BPPV). Methods: Construction and validation of a disease prediction model was performed at the outpatient clinic in the Department of General Medicine of Chiba University Hospital. Patients with dizziness were enrolled (145 patients for construction of the disease prediction model and 61 patients for its validation). This study targeted BPPV of the posterior semicircular canals only with a positive Dix–Hallpike test (DHT + BPPV) to avoid diagnostic ambiguity. Binomial logistic regression analysis was performed to identify the items that were useful for diagnosis or exclusion of DHT + BPPV. Results: Twelve patients from the derivation set and six patients from the validation set had DHT + BPPV. Binomial logistic regression analysis selected a "duration of dizziness ≤15 seconds" and "onset when turning over in bed" as independent predictors of DHT + BPPV with an odds ratio (95% confidence interval) of 4.36 (1.18–16.19) and 10.17 (2.49–41.63), respectively. Affirmative answers to both questions yielded a likelihood ratio of 6.81 (5.11–9.10) for diagnosis of DHT + BPPV, while negative answers to both had a likelihood ratio of 0.19 (0.08–0.47). Conclusion: A "duration of dizziness ≤15 seconds" and "onset when turning over in bed" were the two most important questions among various historical features of BPPV.
High Emotional Arousal Enables Subliminal Detection of Concealed Information  [PDF]
Akemi Osugi, Hideki Ohira
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.810098
Abstract: The Concealed Information Test (CIT) is an information-detecting technique for criminal investigations. Although it has been shown that emotional arousal plays a specific role in the CIT, the mechanisms by which emotional arousal affects the CIT are unclear. The main purpose of this study was to elucidate the processing pathway for stimuli encoded with emotional arousal in a mock crime before the CIT. In this study, participants viewed emotionally arousing pictures before the mock crime. Participants were assigned randomly to either a high or low emotional arousal group, viewing pictures expected to arouse emotion at a high or low level, respectively. Subsequently, all participants enacted the same mock crime, in which they were instructed to stab a pillow with a sharp-edged tool (e.g., kitchen knife or ice pick) as if to harass a woman lying on a bed. After the antecedent emotional experience, a P300-based CIT was conducted using subliminal and supraliminal presentation methods. The results revealed a significantly greater CIT effect on the P300 event-related potential (ERP) component in the High Arousal group compared with the Low Arousal group, under both subliminal and supraliminal conditions. The detection of concealed information was successful only in the High Arousal group under subliminal conditions, whereas detection was successful regardless of the emotional arousal group under supraliminal conditions. These results provide strong evidence that emotional arousal can increase P300 amplitude during responses to concealed information in the CIT. This suggests that concealed information may be automatically processed via the bottom-up route in the CIT, but only when it is encoded with high emotional arousal.
Emissivities of gamma's and electrons/positrons Induced by Collisions between Cosmic-Ray Proton and ISM in the Galaxy
Shibata, T.;Ohira, Y.;Kohri, K.;Yamazaki, R.
High Energy Physics - Phenomenology , 2013,
Abstract: We show that the production cross-sections of $\gamma$ and e$^\pm$ in p-p collision, $\sigma_{pp\rightarrow \gamma}$ and $\sigma_{pp\rightarrow {\rm e}^\pm}$ respectively, may be kinematically equivalent without back to that of the parent pion $\sigma_{pp\rightarrow \pi}$. So we can obtain straightforwardly $\sigma_{pp\rightarrow {\rm e}^\pm}$ once we have $\sigma_{pp\rightarrow \gamma}$ with help of the machine data. We discuss in detail the relation between them, and present how reliable for $\sigma_{pp\rightarrow {\rm e}^\pm}$ even in the TeV region. Based on these studies, we give also the emissivities of $\gamma$ and e$^\pm$ in the Galaxy, and present the positron fraction observed at the solar system, the ratio of e$^+$ to [e$^+$ + e$^-$]. It is now in a vital open question that it appears to rise as the energy gets higher, $\gtrsim$\,10\,GeV, far beyond the expectation with the standard model today. The aim of the present paper is to give the production cross-section of e$^\pm$ firmly even in the TeV region, in order to see quantitatively how much deviated from the standard model in the yield of e$^\pm$ and its propagation to the Earth.
Predictors for benign paroxysmal positional vertigo with positive Dix–Hallpike test
Noda K,Ikusaka M,Ohira Y,Takada T
International Journal of General Medicine , 2011,
Abstract: Kazutaka Noda, Masatomi Ikusaka, Yoshiyuki Ohira, Toshihiko Takada, Tomoko TsukamotoDepartment of General Medicine, Chiba University Hospital, Chiba, JapanObjective: Patient medical history is important for making a diagnosis of causes of dizziness, but there have been no studies on the diagnostic value of individual items in the history. This study was performed to identify and validate useful questions for suspecting a diagnosis of benign paroxysmal positional vertigo (BPPV).Methods: Construction and validation of a disease prediction model was performed at the outpatient clinic in the Department of General Medicine of Chiba University Hospital. Patients with dizziness were enrolled (145 patients for construction of the disease prediction model and 61 patients for its validation). This study targeted BPPV of the posterior semicircular canals only with a positive Dix–Hallpike test (DHT + BPPV) to avoid diagnostic ambiguity. Binomial logistic regression analysis was performed to identify the items that were useful for diagnosis or exclusion of DHT + BPPV.Results: Twelve patients from the derivation set and six patients from the validation set had DHT + BPPV. Binomial logistic regression analysis selected a "duration of dizziness ≤15 seconds" and "onset when turning over in bed" as independent predictors of DHT + BPPV with an odds ratio (95% confidence interval) of 4.36 (1.18–16.19) and 10.17 (2.49–41.63), respectively. Affirmative answers to both questions yielded a likelihood ratio of 6.81 (5.11–9.10) for diagnosis of DHT + BPPV, while negative answers to both had a likelihood ratio of 0.19 (0.08–0.47).Conclusion: A "duration of dizziness ≤15 seconds" and "onset when turning over in bed" were the two most important questions among various historical features of BPPV.Keywords: benign paroxysmal positional vertigo, likelihood ratio, diagnosis, screening, prediction rules
Production cross sections of gamma-rays, electrons, and positrons in p-p collisions
T. Shibata,Y. Ohira,K. Kohri,R. Yamazaki
Physics , 2013, DOI: 10.1016/j.astropartphys.2014.01.001
Abstract: Because the production cross sections of gamma-rays, electrons, and positrons made in p-p collisions, $\sigma_{pp\rightarrow \gamma}$ and $\sigma_{pp\rightarrow {e}^\pm}$, respectively, are kinematically equivalent with respect to the parent pion-production cross section $\sigma_{pp\rightarrow \pi}$, we obtain $\sigma_{pp\rightarrow {e}^\pm}$ directly from the machine data on $\sigma_{pp\rightarrow \gamma}$. In Sato et al. (2012), we give explicitly $\sigma_{pp\rightarrow \gamma}$, reproducing quite well the accelerator data with LHC, namely $\sigma_{pp\rightarrow {e}^\pm}$ is applicable enough over the wide energy range from GeV to 20\,PeV for projectile proton energy. We dicuss in detail the relation between the cross sections, and present explicitly $\sigma_{pp\rightarrow {e}^\pm}$ that are valid into the PeV electron energy.
Quantification of group chasing and escaping process
S. Matsumoto,A. Kamimura,T. Nogawa,T. Shimada,N. Ito,T. Ohira
Physics , 2012,
Abstract: We study a simple group chase and escape model by introducing new parameters with which configurations of chasing and escaping in groups are classified into three characteristic patterns. In particular, the parameters distinguish two essential configurations: a one-directional formation of chasers and escapees, and an escapee surrounded by chasers. In addition, pincer movements and aggregating processes of chasers and escapees are also quantified. Appearance of these configurations highlights efficiency of hunting during chasing and escaping.
Beneficial Roles of Emotion in Decision Making: Functional Association of Brain and Body
Hideki Ohira
Psychological Topics , 2011,
Abstract: Though traditional microeconomics has supposed that human decisions are based on logical and exact computation of cost-benefit balances or efficacies, studies in behavioral economics have shown that humans sometimes make seemingly irrational decisions driven by emotions. In our everyday situations, factors related to decisions are complex and which alternative will be the most beneficial is uncertain. In such cases, emotions have been thought adaptive because they can quickly reduce negative alternatives and facilitate fast and effective decision making. Some theorists argued that one of important sources of such emotional drives affecting decision making is bodily responses that are represented in brain regions (Craig, 2009; Damasio, 1994). In this article, empirical evidence for the functional associations of the brain and body accompanying decision making will be shown as follows. (1) Heart rate responses and concentration of inflammatory cytokine (IL-6) can predict acceptance or rejection of an unfair offer in an economical negotiation game, the Ultimatum Game. Activation of the anterior insula mediates relationship between bodily states and decision making. (2) Sympathetic responses reflected by secretion of adrenaline are represented in brain regions such as the midbrain, anterior cingulate cortex, and anterior insula, and furthermore can determine exploration of decision making in a situation where an action-outcome contingency is stochastic and unstable. These findings suggest beneficial roles of emotion and bodily responses in decision making.
Oscillatory correlation of delayed random walks
Toru Ohira
Physics , 1997, DOI: 10.1103/PhysRevE.55.R1255
Abstract: We investigate analytically and numerically the statistical properties of a random walk model with delayed transition probability dependence (delayed random walk). The characteristic feature of such a model is the oscillatory behavior of its correlation function. We investigate a model whose transient and stationary oscillatory behavior is analytically tractable. The correspondence of the model with a Langevin equation with delay is also considered.
Encryption with Delayed Dynamics
Toru Ohira
Physics , 1998, DOI: 10.1016/S0010-4655(99)00279-9
Abstract: We propose here a new model of encryption of binary data taking advantage of the complexity associated with delayed dynamics. In this scheme, the encryption process is a coupling dynamics with various time delays between different bits in the original data. It is shown that decoding of the encrypted data is extremely difficult without a complete knowledge of coupling manner with associated delays for all bits of the data.
Stochasticity and Non-locality of Time
Toru Ohira
Physics , 2007, DOI: 10.1016/j.physa.2007.01.015
Abstract: We present simple classical dynamical models to illustrate the idea of introducing a stochasticity with non-locality into the time variable. For stochasticity in time, these models include noise in the time variable but not in the "space" variable, which is opposite to the normal description of stochastic dynamics. Similarly with respect to non-locality, we discuss delayed and predictive dynamics which involve two points separated on the time axis. With certain combinations of fluctuations and non-locality in time, we observe a ``resonance'' effect. This is an effect similar to stochastic resonance, which has been discussed within the normal context of stochastic dynamics, but with different mechanisms. We discuss how these models may be developed to fit a broader context of generalized dynamical systems where fluctuations and non-locality are present in both space and time.
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