著者
Koichi Takemura Daisuke Ohshima Akihiro Noriki Daisuke Okamoto Akio Ukita Jun Ushida Masatoshi Tokushima Takanori Shimizu Ichiro Ogura Daisuke Shimura Tsuyoshi Aoki Takeru Amano Takahiro Nakamura
出版者
The Japan Institute of Electronics Packaging
雑誌
Transactions of The Japan Institute of Electronics Packaging (ISSN:18833365)
巻号頁・発行日
vol.15, pp.E21-012-1-E21-012-13, 2022 (Released:2022-04-25)
参考文献数
25
被引用文献数
3

We propose silicon (Si)-photonics-embedded interposers as a novel packaging platform to achieve co-packaged optics. An interposer is an organic substrate that has Si-photonics transceiver dies buried in it and polymer optical waveguides connecting the embedded Si chips and optical connectors. We also developed a Si-photonics-device-embedding process and investigated the properties and operations of embedded Si-photonics devices as a feasibility study. The embedded arrayed waveguide grating and reflective optical filter showed a wavelength shift on the order of 0.1 nm with our embedding process. The shifts seem to be due to the difference in ambient temperature during the measurements and induced strain. Though this embedding process is presumed to affect the spectrum for Si-photonics devices, the difference is small enough to be controlled. Embedded Si-photonics transmitter- and receiver-integrated circuits successfully demonstrated 25-Gb/s operations. The proposed Si-photonics-embedded interposer is a promising candidate for a co-packaged optics platform to eliminate the interconnect bandwidth bottleneck for high-performance computing systems.
著者
Eiichiro Matsubara Shigeo Sato Muneyuki Imafuku Takahiro Nakamura Hisato Koshiba Akihisa Inoue Yoshio Waseda
出版者
The Japan Institute of Metals
雑誌
Materials Transactions, JIM (ISSN:09161821)
巻号頁・発行日
vol.41, no.11, pp.1379-1384, 2000 (Released:2007-06-01)
参考文献数
15
被引用文献数
13 14

This paper has been retracted by the Editorial Committee with the first author’s agreement due to substantial overlap with the following paper previously received in another journal. Mater. Sci. Eng. A 312 (2001) 136-144 Structural study of Amorphous Fe70M10B20 (M=Zr, Nb and Cr) alloys by X-ray diffraction E. Matsubara, S. Sato, M. Imafuku, T. Nakamura, H. Koshiba, A. Inoue, Y. Waseda (Received on May 8, 2000) And thus, it shall not be regarded as an original paper. Although this paper was submitted to the Special Issue on Bulk Amorphous, Nano-Crystalline and Nano-Quasicrystalline Alloys by the first author without understanding the bylaws of Materials Transactions, JIM, it was not an appropriate deed. The first author acknowledges the substantial overlap and his apologies have been accepted accordingly. The notice has been issued to all the authors to pay more careful attention in submitting papers.
著者
Takahiro Nakamura Masahiro Hashizume Kayo Ueda Tatsuhiko Kubo Atsushi Shimizu Tomonori Okamura Yuji Nishiwaki
出版者
日本疫学会
雑誌
Journal of Epidemiology (ISSN:09175040)
巻号頁・発行日
vol.25, no.4, pp.289-296, 2015-04-05 (Released:2015-04-05)
参考文献数
21
被引用文献数
1 12

Background: Asian dust events are caused by dust storms that originate in the deserts of China and Mongolia and drift across East Asia. We hypothesized that the dust events would increase incidence of out-of-hospital cardiac arrests by triggering acute events or exacerbating chronic diseases.Methods: We analyzed the Utstein-Style data collected in 2005 to 2008 from seven prefectures covering almost the entire length of Japan to investigate the effect of Asian dust events on out-of-hospital cardiac arrests. Asian dust events were defined by the measurement of light detection and ranging. A time-stratified case-crossover analysis was performed. The strength of the association between Asian dust events and out-of-hospital cardiac arrests was shown by odds ratios and 95% confidence intervals in two conditional logistic models. A pooled estimate was obtained from area-specific results by random-effect meta-analysis.Results: The total number of cases of out-of-hospital cardiac arrest was 59 273, of which 35 460 were in men and 23 813 were in women. The total number of event days during the study period was smallest in Miyagi and Niigata and largest in Shimane and Nagasaki. There was no significant relationship between Asian dust events and out-of-hospital cardiac arrests by area in either of the models. In the pooled analysis, the highest odds ratios were observed at lag day 1 in both model 1 (OR 1.07; 95% CI, 0.97–1.19) and model 2 (OR 1.08; 95% CI, 0.97–1.20). However, these results were not statistically significant.Conclusions: We found no evidence of an association between Asian dust events and out-of-hospital cardiac arrests.