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A scheme on multi-tier heterogeneous networks for citywide damage monitoring in an earthquake
Fujiwara, Takahiro,Watanabe, Takashi,Shinozuka, Masanobu Techno-Press 2013 Smart Structures and Systems, An International Jou Vol.11 No.5
Quick, accurate damage monitoring is strongly required for damage assessment in the aftermath of a large natural disaster. Wireless sensor networks are promising technologies to acquire damage information in a citywide area. The wireless sensor networks, however, would be faced with difficulty to collect data in real-time and to expand the scalability of the networks. This paper discusses a scheme of network architecture to cove a whole city in multi-tier heterogeneous networks, which consist of wireless sensor networks, access networks and a backbone network. We first review previous studies for citywide damage monitoring, and then discuss the feature of multi-tier heterogeneous networks to cover a citywide area.
A scheme on multi-tier heterogeneous networks for citywide damage monitoring in an earthquake
Takahiro Fujiwara,Takashi Watanabe,Masanobu Shinozuka 국제구조공학회 2013 Smart Structures and Systems, An International Jou Vol.11 No.5
Quick, accurate damage monitoring is strongly required for damage assessment in the aftermath of a large natural disaster. Wireless sensor networks are promising technologies to acquire damage information in a citywide area. The wireless sensor networks, however, would be faced with difficulty to collect data in real-time and to expand the scalability of the networks. This paper discusses a scheme of network architecture to cove a whole city in multi-tier heterogeneous networks, which consist of wireless sensor networks, access networks and a backbone network. We first review previous studies for citywide damage monitoring, and then discuss the feature of multi-tier heterogeneous networks to cover a citywide area.
Magnetization Reversal and Chemical Pressure Effect in the Electron-doped Manganite CaMn0.95Sb0.05O3
Takahiro Fujiwara,Michiaki Matsukawa,Syuya Ohuchi,Satoru Kobayashi,Shigeki Nimori,Ramanathan Suryanarayanan 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have demonstrated the effect of Sr substitution on the temperature-dependent magnetizationreversal in the electron-doped manganite CaMn0.95Sb0.05O3. X-ray photoemission spectroscopyreveals the substitution of the Sb ion with its valence of 5+ at a Mn4+ site, resulting in oneeg-electron doping, which is consistent with the negative Seebeck coefficient previously reported. For the (Ca1−ySry)Mn0.95Sb0.05O3 system, anomalously-diamagnetic behaviors are observed fory ≤ 15% in the weak-field-cooled magnetization. For Sr contents beyond 15%, the behavior ofthe negative magnetization disappears. We believe that the local lattice distortion due to Sbsubstitution causes a tilting of the Jahn-Teller active Mn3+O6 octahedron and stabilizes the cantedspin state in a direction opposite that of applied field through the Dzyaloshinsky-Moriya interaction,thus contributing to the diamagnetic response.
Tsutomu Ida,Hiroyuki Fujiwara,Takahiro Kiriu,Yoshimi Taniguchi,Akira Kohyama 대한부인종양학회 2019 Journal of Gynecologic Oncology Vol.30 No.6
Objective: To investigate the relationship between the precursors of high grade serousovarian cancer (HGSOC) and the characteristics of patients with a low HGSOC risk in termsof the effects of pregnancy. Methods: We prospectively examined consecutive cases in which the bilateral fallopian tubeswere removed during benign gynecological or obstetric surgery and assessed the relationshipbetween the patient characteristics, including parity and pregnancy, and the incidence ofHGSOC precursors. All the fallopian tubes were examined by applying the Sectioning andExtensively Examining the Fimbriated End (SEE-FIM) Protocol. Results: Of the 113 patients enrolled, 67 were gynecological and 46 were obstetric. The p53signature was identified in 21 patients. No other precursors were identified. In a comparisonof the p53 signature-positive and negative groups, parous women and pregnant womenwere significantly fewer in the p53 signature-positive group (53% vs. 86%, p=0.002, 10%vs. 47%, p=0.001, respectively). Current pregnancy was also associated with a significantlylower incidence of the p53 signature after multivariate adjustment (odds ratio [OR]=0.112;95% confidence interval [95% CI]=0.017–0.731; p=0.022). Among gynecological patients,parous women were fewer in the p53 signature-positive group on univariate (47% vs. 73%,p=0.047) and multivariate analysis (OR=0.252; 95% CI=0.069–0.911; p=0.036). No othercharacteristics were associated with p53 signature positivity. Conclusions: The incidence of the p53 signature was significantly lower in parous womenand pregnant women. This decreased incidence of early phase serous carcinogenesis may beone of the possible mechanisms underlying HGSOC risk reduction among parous women.
SEARCH FOR DEBRIS DISKS BY AKARI AND IRSF
NAMI TAKEUCHI,DAISUKE ISHIHARA,HIDEHIRO KANEDA,SHINKI OYABU,HIROSHI KOBAYASHI,TAKAHIRO NAGAYAMA,TAKASHI ONAKA,HIDEAKI FUJIWARA 한국천문학회 2017 天文學論叢 Vol.32 No.1
Debris disks are important observational clues to understanding on-goingplanetary system formation. They are usually identified by significantmid-infrared excess on top of the photospheric emission of a central star onthe basis of prediction from \sl J\rm-, \sl H\rm-, and \sl Ks\rm-band fluxes and the stellar model spectra. For bright stars, 2MASS near-infrared fluxes suffer large uncertainties due to thenear-infrared camera saturation. Therefore we have performed follow-up observations with the IRSF 1.4 mnear-infrared telescope located in South Africa to obtain accurate \sl J\rm-, \sl H\rm-, and \sl Ks\rm-bandfluxes of the central stars. Among 754 main-sequence stars which are detected in theAKARI 18 $\mu$m band, we have performed photometry for 325 stars with IRSF. As a result, we have successfully improved the flux accuracy of the centralstars from 9.2 \% to 0.5 \% on average. Using this dataset, we have detected 18$\mu$m excess emission from 57 stars in our samples with a 3$\sigma$ level. We find that some of them have high ratios of the excess to the photospheric emission even around very old stars,which cannot be explained by the current planet-formation theories.
Maruyama Toshiaki,Nakamae Toshio,Kamei Naosuke,Tanaka Nobuhiro,Fujiwara Yasushi,Harada Takahiro,Adachi Nobuo 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2
Study Design: A retrospective cohort study.Purpose: We aimed to investigate the surgical results of foramen magnum decompression (FMD) to identify the potential factors associated with syrinx reduction in Chiari malformation type I (CMI).Overview of Literature: The predictive value of preoperative factors for syrinx reduction in patients with CMI remains debatable.Methods: We enrolled patients who underwent microscopic FMD with outer dural layer resection for CMI. The distance from the tip of the cerebellar tonsil to the C2 vertebral endplate on sagittal magnetic resonance imaging (MRI) was defined as the tonsillar distance (TD). Patients who showed a >20% syrinx diameter reduction on the 1-year follow-up MRI were defined as the syrinx reduction group while the others were categorized in the syrinx nonreduction group. Patients with syringomyelia were categorized into the clinically improved and unimproved groups using the Chicago Chiari Outcome Scale. The imaging and clinical parameters were evaluated pre- and postoperatively.Results: This study included 25 patients of whom 19 (76.0%) had syringomyelia. At the 1-year follow-up, the syrinx diameter had decreased in 11 patients (57.8%). The increased TD significantly differed between the syrinx reduction and nonreduction groups. At the 1-year follow-up, 12 and seven patients with syringomyelia were categorized into the clinically improved and unimproved groups, respectively. The clinically improved and unimproved groups showed significant differences in the mean age and increased TD.Conclusions: Postoperative syrinx reduction was significantly correlated with the upward shifting of the cerebellar tonsil in patients with CMI. Our quantitative evaluation of the alterations in hindbrain position after FMD was easily performed and reflects the clinical outcomes.
DEBRIS DISKS AND THE ZODIACAL LIGHT EXPLORED BY THE AKARI MID-INFRARED ALL-SKY SURVEY
DAISUKE ISHIHARA,NAMI TAKEUCHI,TORU KONDO,HIROSHI KOBAYASHI,HIDEHIRO KANEDA,SHU-ICHIRO INUTSUKA,SHINKI OYABU,TAKAHIRO NAGAYAMA,HIDEAKI FUJIWARA,TAKASHI ONAKA 한국천문학회 2017 天文學論叢 Vol.32 No.1
Debris disks are circumstellar dust disks around main-sequence stars. They are important observational clues to understanding the planetary system formation. The zodiacal light is the thermal emission from the dust disk in our Solar system. %For a comprehensive understanding of the nature andthe evolution of dust disks around main-sequence stars,we try a comparative study of debris disks and the zodiacal light. %We search for debris disks using the AKARI mid-infrared all-sky point source catalog. By applying accurate flux estimate of the photospheric emissionbased on the follow-up near-infrared observations with IRSF,we have improved the detection rate of debris disks. %For a detailed study of the structure and grain propertiesin the zodiacal dust cloud,as an example of dust disks around main-sequence stars,we analyze the AKARI mid-infrared all-sky diffuse maps. %As a result of the debris disks search,we found old ($>$1\,Gyr) debris disks which have large excess emissioncompared to their age, which cannot be explained simplyby the conventional steady-state evolution model. %From the zodiacal light analysis, we find the possibilitythat the dust grains trapped in the Earth's resonance orbitshave increased by a factor of $\sim$3 in the past $\sim$20 years. %Combining these results, we discuss the non-steady processes in debris disks and the zodiacal light.