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Design and Analysis of On-chip Leakage Monitor using an MTCMOS circuit
Satoshi KOYAMA,Seidai TAKEDA,Kimiyoshi USAMI 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
On cutting-edge semiconductor process, leakage current varies drastically due to process variation and temperature changes. At the circuit design stage, it is difficult to estimate the amount of leakage current at every manufactured chip. Therefore an on-chip function of measuring leakage current is required. The Virtual-ground (VGND) voltage of MTCMOS circuits increases during the sleep operation, because parasitic capacitance of a VGND line is charged up by the leakage current. By applying this behavior, we design leakage monitor circuits using ASPLA 90nm technology. Simulation results show that monitor delay-time is 165ns and monitor-error is 6% under the typical process condition, 25℃ and operating frequency of 200㎒. Power dissipation of designed circuits is 29㎼ in the monitoring mode and 15㎼ in the standby mode.
Satoshi Koyama,Nagisa Yoshihara,Atsushi Takagi,Etsuko Komiyama,Akira Oka,Shigaku Ikeda 대한피부과학회 2023 Annals of Dermatology Vol.35 No.5
Background: Alopecia areata (AA) is considered complex genetic and tissue-specific autoimmune disease. We recently discovered a nonsynonymous variant in the coiled-coil alphahelical rod protein 1 (CCHCR1) gene within the AA risk haplotype. And a water avoidance stress test on CCHCR1 knockout mice induced AA-like lesions. Objective: To investigate the difference clinical findings of AA in patients with the CCHCR1 variant and without. Methods: We conducted a retrospective analysis of the data from 142 AA patients. Among these patients, 20 (14.1%) had a variant of CCHCR1. We evaluated the sex distribution of the patients, age at onset, distribution of the clinical types, prevalence of a positive family history of AA, prevalence of association of AA with atopic dermatitis, response to steroid therapy, and recurrence rate. We used multivariate logistic regression analysis and Fisher’s exact test for statistical analysis. We also investigate electron microscopic observations of hair samples with the CCHCR1 variant and without. Results: The results showed a significant correlation between the CCHCR1 variant and the recurrence rate compared with the variant-negative group (p=0.0072). Electron microscopy revealed abnormalities in the hair shaft structure and hair cuticle in patients with the CCHCR1 variant (p=0.00174). Conclusion: Our results suggest that AA with CCHCR1 variant is clinically characterized by a high recurrence rate and hair morphological abnormality
Kanako Tsushima,Satoshi Ogasawara,Koji Orikawa,Masatsugu Takemoto,Kenji Koyama 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper deals with electromagnetic interference radiated from air-conditioner piping that acts as an antenna and emits electromagnetic noise. The current distribution on the piping is measured by using a near-field magnetic probe, and the distribution mode is analyzed. The results show that the piping resonates at the frequencies where the piping length accords with λ/4, 3λ/4, and 5λ/4, and radiates electromagnetic noise as a monopole antenna. This radiation mechanism is confirmed by simulations using the CST EMC Studio electromagnetic field simulator.
Web-Based IP Packet Transmission Evaluation System
Yuta Ogino,Raja Zahilah,Satoshi Nakatsukasa,Osanori Koyama,Yutaka Katsuyama 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-
A web-based IP transmission evaluation system has been designed and implemented to evaluate IP-over-WDM networks. The system consists of a web server, a network tester for measurement and a controller for the network tester. The evaluation functions were implemented such that the programs in the server and the controller work in corporation with each other to measure and save the data systematically. The system functions were examined in an experimental network, and it was found that the system could generate traffic and measure throughputs and latency effectively in corporation with the web server.
Lightpath Management System for IP-over-CWDM Networks with ROADMs
Raja Zahilah,Soichiro Nishiuma,Tomoyuki Taira,Satoshi Kawase,Osanori Koyama,Yutaka Katsuyama 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-
A lightpath management system has been designed and implemented for IP-over-CWDM networks with ROADMs. The system can search possible lightpaths made by ROADMs with specified switch states. The function is based on an equivalent graph method proposed for representing the ROADMs, and can output lightpaths in the network together with the total loss values. The system functions enable the network administrators to manage the lightpath reconfigurations effectively without errors by avoiding making unlinked lightpaths through routes with higher losses to connect nodes, before the reconfiguration.
Role of Breast Tomosynthesis in Diagnosis of Breast Cancer for Japanese Women
Takamoto, Yayoi,Tsunoda, Hiroko,Kikuchi, Mari,Hayashi, Naoki,Honda, Satoshi,Koyama, Tomomi,Ohde, Sachiko,Yagata, Hiroshi,Yoshida, Atsushi,Yamauchi, Hideko Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5
Introduction: Mammography is the most basic modality in breast cancer imaging. However, the overlap of breast tissue depicted on conventional two-dimensional mammography (2DMMG) may create significant obstacles to detecting abnormalities, especially in dense or heterogeneously dense breasts. In three-dimensional digital breast tomosynthesis (3DBT), tomographic images of the breast are reconstructed from multiple projections acquired at different angles. It has reported that this technology allows the generation of 3D data, therefore overcoming the limitations of conventional 2DMMG for Western women. We assessed the detectability of lesions by conventional 2DMMG and 3DBT in diagnosis of breast cancer for Japanese women. Methods: The subjects were 195 breasts of 99 patients (median age of 48 years, range 34~82 years) that had been pathologically diagnosed with breast cancer from December 20, 2010 through March 31, 2011. Both conventional 2DMMG and 3DBT imaging were performed for all patients. Detectability of lesions was assessed based on differences in category class. Results: Of the affected breasts, 77 (75.5%) had lesions assigned to the same categories by 2DMMG and 3DBT. For 24 (23.5%) lesions, the category increased in 3DBT indicating improvement in diagnostic performance compared to 2DMMG. 3DBT improved diagnostic sensitivity for patients with mass, focal asymmetric density (FAD), and architectural distortion. However, 3DBT was not statistically superior in diagnosis of the presence or absence of calcification. Conclusions: In this study, 3DBT was superior in diagnosing lesions in form of mass, FAD, and/or architectural distortion. 3DBT is a novel technique that may provide a breakthrough in solving the difficulties of diagnosis caused by parenchyma overlap for Japanese women.