著者

Shizuyo Sutou Takashi Egawa Hiroki Mori Hiroaki Aso

出版者

日本環境変異原学会

雑誌

Genes and Environment (ISSN:18807046)

巻号頁・発行日

vol.35, no.3, pp.73-79, 2013 (Released:2013-09-03)

参考文献数

6

被引用文献数

2

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The March 11 earthquake and tsunami crippled the Fukushima Daiichi Nuclear Power Plant of Tokyo Electric Power Company. Consequently, wide areas were contaminated with radioactive substances. The evacuation zone was set as the area within a 20 km radius from the power plant. People who lived in that zone were forced to evacuate immediately. Fukushima Prefectural Disaster Headquarters (FPDH) and the Japanese Governmental Disaster Headquarters (JGDH) planned to let them return to their homes temporarily and asked for help from related organizations, one of which is the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. The ministry asked all Japanese universities and colleges to take part in screening radioactivity of the temporal returnees from the areas, with aids of the temporal returning program. We applied to the screening activities and measured radioactivity of the returnees at Bajikoen Off-site Center on July 14-17, 2011, and at Kawauchi Gymnasium or Hirono Central Gymnasium Off-site Center on July 23-25, 2011, in Fukushima Prefecture. During these periods, 4009 returnees in all were screened at these three Off-site Centers. None was found to be contaminated with radioactivity over 13,000 cpm. Before the returnee screening program, emergency screening had been conducted soon after the disaster. In all, 33,598 people out of 78,000 evacuees (43%) were screened during March 12-December 7, 2011, during which 3,686 volunteers were recruited by MEXT for the screening program. This is a tiny fraction of the temporal returning program. FPDH reported that 102 people were contaminated with more than 100,000 cpm out of 259,108 people generally screened from March 13, 2011-October 10, 2012. The 102 were detected only in the screening in March in 2011. No hazardous effect, however, was detected among them, so far. Screening is still underway. The present article was compiled to record aspects of the large scale radioactivity monitoring program planned by FPDH and JGDH.

著者

Katsuhiko SANDO Takeshi YAMAMOTO Kenji SAWADA Tomoyuki TANIGUCHI Nobuyuki SOWA Hiroki MORI Takahiro KONDO

出版者

The Japan Society of Mechanical Engineers

雑誌

Mechanical Engineering Journal (ISSN:21879745)

巻号頁・発行日

vol.8, no.2, pp.20-00497, 2021 (Released:2021-04-15)

参考文献数

11

被引用文献数

1

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This paper describes a design method of a friction reducer device using a loading cam to suppress unstable vibration. Nonlinear simulation and energy analysis of numerical solutions demonstrates that destabilization is caused by the large phase difference between the slipping velocity in the translation direction and that in the rotation direction. It was found that similarly unstable vibration occurs in various structures using wedge rollers with translational and rotational motion. The analytical equation could be simplified by focusing on the motion factor that affects the slip velocity of the power transmission surface, which is the factor of vibration. Consequently, the design method for suppressing vibration could be expressed by a mathematical formula. This equation is validated by using the results of experiments conducted in the previous work of the current authors. Furthermore, from this equation, we proposed that vibration could be suppressed by the parameter balance of the power transmission device without using damping. The power transmission surface slips when a quick torque is input and damping is used. The proposed design can handle a quick torque response and reduce the weight of the reducer. Specifically, the shape of the wedge roller is made lighter, so that the moment of inertia of the roller is not lowered, or the wedge roller is set as a small roller.

著者

Hiroki Mori Tadahiro Yoshikawa Hitomi Kimura Hiroshi Ono Hitoshi Kato Yasuo Ono Masaki Nii Takahiro Shindo Ryo Inuzuka Hitoshi Horigome Masaru Miura Shunichi Ogawa Junko Shiono Yoshiyuki Furutani Mikiko Ishido Toshio Nakanishi

出版者

The Japanese Circulation Society

雑誌

Circulation Journal (ISSN:13469843)

巻号頁・発行日

vol.86, no.1, pp.109-115, 2021-12-24 (Released:2021-12-24)

参考文献数

21

被引用文献数

1 4

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Background:There has been no nationwide survey on the prognosis of pediatric dilated cardiomyopathy (DCM) in Japan. Therefore, we designed this retrospective multicenter study to investigate the long-term survival rate in pediatric patients with DCM in Japan.Methods and Results:In this multicenter retrospective observational study, data were reviewed for 106 patients aged <18 years who had been diagnosed with DCM at any 1 of 18 Japanese institutions between 1990 and 2014. The median age at diagnosis was 2.0 years and the median duration of observation was 3.3 years. Most DCM patients were diagnosed because of symptoms of heart failure. On echocardiography, the median left ventricular end-diastolic dimension z score was 5.4 and fractional shortening was 0.10. Freedom from death or transplantation rates at 1, 3, 5, 10, and 20 years after diagnosis were 76%, 66%, 64%, 58%, and 43%, respectively. Freedom from death rates at 1, 5, 10, and 20 years after diagnosis were 81%, 75%, 72%, and 53%, respectively. The incidence of heart transplantation at 1, 5, 10, and 20 years after diagnosis was 6%, 15%, 20%, and 20%, respectively, suggesting that only 15% of patients in Japan underwent heart transplantation within 5 years of diagnosis.Conclusions:In Japan, the prognosis of pediatric DCM is poor and the rate of heart transplantation is low.

著者

Tateki Kato Hiroyoshi Yamada Hiroki Mori

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Communications Express (ISSN:21870136)

巻号頁・発行日

vol.11, no.12, pp.760-765, 2022-12-01 (Released:2022-12-01)

参考文献数

6

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Achieving high-resolution 2-dimentional (2D) or 3-dimentional (3D) imaging with millimeter-wave radar requires a large number of antenna elements. Synthetic aperture radar (SAR) is commonly used to achieve high-resolution imaging. However, SAR usually requires long observation time due to mechanical scanning. In this study, we have developed a prototype high-resolution millimeter-wave MIMO (Multiple-Input Multiple-Output) radar with non-uniform planar arrays for both transmitter and receiver. We achieved high-resolution 3D imaging by applying virtual array processing to the received data. In this report, we provide the spatial resolution evaluation of the prototype millimeter-wave non-uniform 2D-MIMO radar by experiments.