地震活動の異常性とモデリング

要旨あり地震予測と統計モデル研究詳

最近の地震活動の解析

Open House, ISM in Tachikawa, 2016.6.17統計数理研究所オープンハウス（立川）、H28.6.17ポスター発

Precursory seismic anomalies and transient crustal deformation prior to the 2008 Mw=6.9 Iwate-Miyagi Nairiku, Japan, earthquake

平成21年度研究報告会、統計数理研究所(広尾）、H22.3.18-19ポスター発

Analysis of Induced seismicity after the 2011 Tohoku-Oki earthquake by non-stationary ETAS models

Open House, ISM in Tachikawa, 2013.6.14統計数理研究所オープンハウス（立川）、H25.6.14ポスター発

What Affects the Visualization of Prostate Cancer Using MRI in Patients Treated with RARP?

Aim：To assess the index lesions（the largest and clinically significant ones）in cases of surgically confirmed prostate cancer（PCa）using a multi-parametric MRI at 3 tesla and to evaluate the relationships between the clinical-pathological features of index PCas and cancer visualization. Materials and Methods：This retrospective study included 67 patients who had undergone roboticassisted radical prostatectomy. Two radiologists reviewed the MRIs（axial and coronal T2-weighted imaging, diffusion-weighted imaging（DWI）with apparent diffusion coefficient mapping and dynamic contrast enhancement MRI（DCEI））. The patients were divided into 4 groups as follows：detected on all 3 sequences（A）, on 2 of 3 sequences（B）, on 1 of 3 sequences（C）, and on none of them（D）. In all groups, all PCa characteristics were assessed, including the PSA level, Grade Group（GG）based on the Gleason score（GS）, the D’Amico criteria, and the maximum tumour length（TL）of the biopsy specimen. Results：Of the 67 patients, 16 were high-risk according to the D’Amico criteria, and 15 of these 16 high-risk patients（94％）belonged to either Group A or Group B. In addition, the mean TL and GG were longer and higher, respectively, in Group A than in the other groups（p＜0.05）. Furthermore, in Group B, 3 of the 4 high-risk patients（75％）were detected using DWI and DCEI. The lesions detected using DWI and DCEI had higher GSs and were in a higher GG. Conclusion：PCas of pathologically higher grades and clinically higher risk were more readily detectableusing multiple parameters

Background swarm earthquake rates modulated by volumetric strain changes

Open House, ISM in Tachikawa, 2015.6.19統計数理研究所オープンハウス（立川）、H27.6.19ポスター発

伊豆東部火山地帯において群発地震予測の可能性を探る

Open House, ISM in Tachikawa, 2014.6.13統計数理研究所オープンハウス（立川）、H26.6.13ポスター発

Frequency components of systolic blood pressure variability reflect vasomotor and cardiac sympathetic functions in conscious rats

In this study, after confirming the suppression of autonomic nervous function by isoflurane anesthesia using autonomic antagonists, we pharmacologically investigated the involvement of vasomotor and cardiac sympathetic functions in systolic blood pressure variability (SBPV) frequency components in conscious rats at rest and during exposure to low-ambient temperature (LT-exposure, 9°C for 90 min). Under unanesthesia, phentolamine administration (α-adrenoceptor antagonist, 10 mg/kg) decreased the mid-frequency component (MF 0.33–0.73 Hz) and inversely increased the high-frequency component (HF 1.3–2.5 Hz). The increased HF was suppressed by subsequent treatment with atenolol (β-adrenoceptor antagonist, 10 mg/kg), but not with atropine (muscarinic receptor antagonist, 10 mg/kg). Moreover, phentolamine administration after atenolol decreased MF, but did not increase HF. LT-exposure increased MF and HF; however, phentolamine pretreatment suppressed the increased MF during LT-exposure, and atenolol pretreatment dose-dependently decreased the increased HF. These results suggest that MF and HF of SBPV may reflect α-adrenoceptor-mediated vasomotor function and β-adrenoceptor-mediated cardiac sympathetic function, respectively, in the conscious state