NAGAI Yasuhiro

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Name
NAGAI Yasuhiro
Affiliation
Kyoto University
Section
Academic Center for Computing and Media Studies, Academic Center for Computing and Media Studies Department of Networking Research
Job title
Professor
Degree
Dr Engneering(Keio University)

Research Areas

 
 

Academic & Professional Experience

 
1981
 - 
2006
 NTT Researcher,1992-1993 Univ.California Researcher
 

Education

 
 
 - 
1981
Graduate School, Division of Engineering, Keio University
 

Published Papers

 
Standard Levels of Authentication and Security for Use in Japanese Academic Cloud Services
Yamaji, K., Nishimura, K., Nagai, Y., Sato, H., Nakamura, M., Ito, T., Nishimura, N., Okada, Y.
TERENA Networking Conference 2014      May 2014   [Refereed]
IT Service & Its Security Level at Kyoto Univ.~Level of Assurance~
NAGAI Yasuhiro
“GakuNin” Federation Work shop at Kyoto      Dec 2011
T. Komura; Y. Nagai; S. Hashimoto; M. Aoyagi; K. Takahashi
Proceedings - 2009 9th Annual International Symposium on Applications and the Internet, SAINT 2009   235-238   Jul 2009   [Refereed]
Design and Evaluation of High Security Contact/Contactless Smart IC Cards
K. Tsuru, K. Murata, Y. Ohtani, and Y. Nagai
The 27th Annual Conference of the IEEE Industrial Electronics Society (Proc. IECON’01),pp.76-79      2001   [Refereed]
A Q&A learning system using consumer connmucation tools for personal interactive communication
Y.Nagai, T.Kon, M.Shinji, H.Kimura, and K.Yamamoto
1997 Digest of Technical Papers of Int. Conf. on Consumer Electronics (ICCE'97),pp.440-441      1997   [Refereed]
A study on antenna coils for wireless ID tags
N.Suzuki, Y.Nagai, Y.Ohtani and Y.Ichinose
Proceedings of 1997 Asia Pacific Microwave Conference (APMC ’97),Vol.III, pp.1077-1080      1997   [Refereed]
Radio frequency card systems for indoor personal communication services
Y.Ohtani, Y.Nagai, N.Suzuki and Y.Ichinose
1996 Asia Pacific Microwave Conference,E7.INV1, pp.755      1996   [Refereed]
What is possible when using multimedia networks for education
M.Shinji, H.Kimura, K.Yamamoto, T.Kon and Y.Nagai
Proc. of Int. Symp. on Educational Revolution with Internet (ERI'96,pp.73-78      1996   [Refereed]
Analysis of an electromagnetically coupled superconducting small antenna using a simulation model
N.Suzuki, K.Itoh, Y.Nagai and O.Michikami
Proc. Int. Symp. Supercond.(Springer-Verlag, Tokyo),p1159      1996   [Refereed]
Superconductive passive microwave devices
Y.Nagai
Proc. of European Conf. Appl. Supercond. (EUCAS'95),OSD1      1995   [Invited]
High temperature Superconducting filters and antennas
Y.Nagai
Proc. Volume of Superconducting Symposium titled "Low temperature electronics and high temperature superconductivity",p19      1995   [Invited]
Application of superconductive microwave passive devices to telecommunications
Y.Nagai
ISTEC Journal,7, p36      1994
Superconductive bandpass filters
Y.Nagai, D.F.Hebert, N.Suzuki, O.Michikami and T.Van Duzer
Proc. Int. Symp. Supercond., (Springer-Verlag, Tokyo),p1155      1994   [Refereed]
Superconductive filters and antennas
Y.Nagai, N.Suzuki, O.Michikami and T.Van Duzer
Extended Abst. Int. Workshop on High-temp. Supercond. Elect. Dev. (HTSED'94),3-3, p64      1994   [Invited]
Microwave passive devices
Y.Nagai
ISTEC Journal,7, p33      1994
Superconductive filters with several functions
Y.Nagai, O.Michikami and T.Van Duzer
Digest of Microwave Workshop and Exhibition (MWE'93),p347      1993   [Refereed]
Superdirective array antennas composed of high-Tc superconducting small helical radiators
K.Itoh, O.Ishii, Y.Nagai, N.Suzuki, Y.Kimachi and O.Michikami
Proc. Int. Symp. Antenna Prob. (ISAP'92),p1025      1993   [Refereed]
Superconductive small antennas made of EuBaCuO thin films
N.Suzuki, Y.Nagai, K.Itoh and O.Michikami
Proc. Int. Symp. Supercond., Tokyo, (Springer-Verlag, Tokyo),p1187      1993   [Refereed]
Pulse propagation in 8 um-wide coplanar superconductive transmission line
Y.Nagai, N.Suzuki, K.Itoh, O.Michikami and T.Van Duzer
Proc. Int. Symp. Supercond., Tokyo, (Springer-Verlag, Tokyo),p1187      1993   [Refereed]
Planarization for integrated circuits using high-temperature superconductors
A.P.Marathe, X.Meng, Y.Nagai and T.Van Duzer
Abst. MRS spring meeting,T13.5      1993   [Refereed]
Minitualization of array antennas with superdirective excitation
O.Ishii, K.Itoh, Y.Nagai and K.Kagoshima
Proc. Antenna Propagation Symp. (APS'93),D-8, p1850      1993   [Refereed]
High-Tc superconducting microwave devices for communication systems
O.Michikami, Y.Nagai, K.Itoh, N.Suzuki and Y.Kimachi
Proc. Int. Symp. Supercond., Tokyo (Springer-Verlag, Tokyo),p1187      1993   [Refereed]
Superconductive small antennas with thin-film matching circuits
N.Suzuki, Y.Nagai, K.Itoh and O.Michikami
Proc. Int. Symp. Antenna Prob. (ISAP'92),p1009      1992   [Refereed]
Surface resistance in high-Tc superconductors and their application to microwave devices
T.Konaka, M.Sato, H.Asano and Y.Nagai
Proc. Int. Symp. Supercond., Tokyo, (Springer-Verlag, Tokyo),p931      1992   [Refereed]
Properties of superconductive delay line using EuBaCuO superconducting films
Y.Nagai, N.Suzuki, K.Itoh and O.Michikami
Proc. Int. Symp. Supercond., Tokyo(Springer-Verlag, Tokyo, 1992),p949      1992   [Refereed]
Improvement of critical current by oxygen plasma treatment
Y.Nagai and K.Tsuru
Proc. Int. Symp. Supercond., Sendai, 1990 (Springer-Verlag, Tokyo),p1175      1991   [Refereed]
High-Tc superconducting high-Q coplanar resonator made on MgO
T.Konaka, M.Sato, H.Asano, S.Kubo and Y.Nagai
1991 IEEE MTT-S Digest,RR-4, p1337      1991   [Refereed]
Y.Nagai, C.Nishimura and T.Toshima
Japanese journal of applied physics. Pt. 2, Letters   24(4) L272-L274   Apr 1985   [Refereed]
NAGAI, Y; TOSHIMA, T
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   4(2) 179-183   Mar 1986   [Refereed]
NAGAI, Y; TOSHIMA, T
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   4(5) 2364-2368   Sep 1986   [Refereed]
Y.Nagai and M.senda
Jpn. J. Appl. Phys.,26, pL1514   26(9) L1514-L1516   Sep 1987   [Refereed]
NAGAI, Y; TAGO, A; TOSHIMA, T
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   5(1) 61-66   Jan 1987   [Refereed]
NAGAI, Y; TAGO, A; YANAGISAWA, K; TOSHIMA, T
JOURNAL OF APPLIED PHYSICS   61(8) 3841-3843   Apr 1987   [Refereed]
XPS Investigations of Ni-Fe Alloy and Fe Films
Y.Nagai, M.Senda and T.Toshima
Japanese journal of applied physics. Pt. 2, Letters   26(7) L1131-L1134   Jul 1987   [Refereed]
NISHIMURA, C; NAGAI, Y; YANAGISAWA, K; TOSHIMA, T
IEEE TRANSACTIONS ON MAGNETICS   23(5) 2728-2730   Sep 1987   [Refereed]
NAGAI, Y; SENDA, M; TOSHIMA, T
JOURNAL OF APPLIED PHYSICS   63(4) 1136-1140   Feb 1988   [Refereed]
NAGAI, Y; YANAGISAWA, K; SENDA, M
JOURNAL OF APPLIED PHYSICS   64(3) 1343-1346   Aug 1988   [Refereed]
NAGAI, Y; SENDA, M
JOURNAL OF APPLIED PHYSICS   64(8) 4108-4112   Oct 1988   [Refereed]
SENDA, M; NAGAI, Y
JOURNAL OF APPLIED PHYSICS   65(3) 1238-1242   Feb 1989   [Refereed]
SENDA, M; NAGAI, Y
JOURNAL OF APPLIED PHYSICS   65(8) 3151-3156   Apr 1989   [Refereed]
SENDA, M; NAGAI, Y
JOURNAL OF APPLIED PHYSICS   65(8) 3157-3160   Apr 1989   [Refereed]
Improvement of Surface Flatness on BiSrCaCuO Film
Y.Nagai and K.Tsuru
Japanese journal of applied physics. Pt. 2, Letters   28(11) L1970-L1972   Nov 1989   [Refereed]
Preparation of microbridges by BiSrCaCuO superconducting film
Y.Nagai and K.Tsuru
Trans. Inst. Electron. Inf. & Commun. Eng.,E73, p516      1990   [Refereed]
SENDA, M; NAGAI, Y
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   8(1) 13-18   Jan 1990   [Refereed]
Localized Orientation Control in BiSrCaCuO Superconducting Film
Y.Nagai and K.Tsuru
Japanese journal of applied physics. Pt. 2, Letters   29(9) L1600-L1603   Sep 1990   [Refereed]
SENDA, M; NAGAI, Y
JOURNAL OF APPLIED PHYSICS   68(7) 3508-3511   Oct 1990   [Refereed]
High-Q end-coupled coplanar transmission line resonator of high-Tc EuBaCuO film on MgO
M.Sato, K.Konaka, H.Asano, S.Kubo and Y.Nagai
Trans. Inst. Electron. Inf. & Commun. Eng.,E74, p1980      1991   [Refereed]
NAGAI, Y; TSURU, K; TERADA, A; YANAGISAWA, K
IEEE TRANSACTIONS ON MAGNETICS   27(2) 1622-1625   Mar 1991   [Refereed]
Properties of Superconductive Strip-line Resonators Fabricated Using EuBaCuO Films on MgO (100)
Y.Nagai, M.Sato, H.Asano, S.Kubo and T.Konaka
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   30(8) 1679-1684   Aug 1991   [Refereed]
NAGAI, Y; SUZUKI, N; SATO, M; KONAKA, T
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   30(11A) 2751-2755   Nov 1991   [Refereed]
Non-dispersive and dispersive delay lines using high-Tc superconducting films
Y.Nagai, N.Suzuki, K.Itoh and O.Michikami
Trans. Inst. Electron. Inf. & Commun. Eng.,E75C, p876      1992   [Refereed]
Superconducting small antennas with thin-film matching circuits
N.Suzuki, Y.Nagai, K.Itoh and O.Michikami
Trans. Inst. Electron. Inf. & Commun. Eng.,E75C, p906      1992   [Refereed]
KONAKA Tsuneo, SATO Makoto, ASANO Hidefumi, KUBO Shugo, NAGAI Yasuhiro
The Transactions of the Institute of Electronics,Information and Communication Engineers. C-(0xF9C2)   75(2) 121-129   Feb 1992   [Refereed]
Novel Superconductive Delay Line Process Using High-T_c Superconducting Films
Y.Nagai, N.Suzuki, Y.Kimachi and O.Michikami
Japanese journal of applied physics. Pt. 2, Letters   31(3) L242-L245   Mar 1992   [Refereed]
ITOH, K; ISHII, O; NAGAI, Y; SUZUKI, N; KIMACHI, Y; MICHIKAMI, O
JOURNAL OF SUPERCONDUCTIVITY   5(5) 485-490   Oct 1992   [Refereed]
K.Itoh, O.Ishii, Y.Nagai, N.Suzuki, Y.Kimachi and O.Michikami
IEEE Trans. Appl. Supercond.,3, p2836      1993   [Refereed]
High-Tc superconducting thin-films
S.Miyazawa, Y.Tazoh, H.Asano, Y.Nagai, O.Michikami and M.Suzuki
Adv. Mater.,5, p179      1993   [Invited]
A.P.Marathe, X.Meng, Y.Nagai and T.Van Duzer
IEEE Trans. Appl. Supercond.,3, p2373      1993   [Refereed]
1.5-GHz Band-Pass Microstrip Filters Fabricated Using EuBaCuO Superconducting Films
Y.Nagai, K.Itoh, N.Suzuki and O.Michikami
Japanese journal of applied physics. Pt. 2, Letters   32(2) L260-L263   Feb 1993   [Refereed]
NAGAI, Y; HEBERT, DF; VANDUZER, T; MICHIKAMI, O
APPLIED PHYSICS LETTERS   63(6) 830-832   Aug 1993   [Refereed]
NAGAI, Y; HEBERT, DF; VANDUZER, T; SUZUKI, N; MICHIKAMI, O
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   32(12A) 5527-5531   Dec 1993   [Refereed]
SUZUKI, N; ITOH, K; NAGAI, Y; MICHIKAMI, O
PHYSICA B   194 129-130   Feb 1994   [Refereed]
HAYASHI, T; MIKAZUKI, T; SUZUKI, N; NAGAI, Y
ELECTRONICS LETTERS   30(17) 1424-1425   Aug 1994   [Refereed]
Properties of Thin-Film Thermal Switches for High-T_c Superconductive Filter (Special Section on Superconducting Devices)
Nagai Yasuhiro;Suzuki Naobumi;Michikami Osamu
IEICE transactions on electronics   77(8) 1229-1233   Aug 1994   [Refereed]
Suzuki, N; Itoh, K; Nagai, Y; Michikami, O
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   6(1) 13-18   Mar 1996   [Refereed]
A new personal multi-functional card and related communication equipment for an automatic call forwarding service
Nagai, Y; Ohtani, Y; Suzuki, N; Ichinose, Y; Kumahara, N
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E79A(7) 1097-1103   Jul 1996   [Refereed]
Wireless Tag System Using an Infrared Beam and an Electromagnetic Wave for Outdoor Facilities
Y.Nagai, N.Suzuki, Y.Ohtani and Y.Ichinose
IEICE transactions on communications   80(3) 494-498   Mar 1997   [Refereed]

Misc

 
SUZUKI Naobumi, NISHITANI Takashi, DOBASHI Hisanobu, NAGAI Yasuhiro
Technical report of IEICE. KBSE   100(541) 33-38   Jan 2001
This paper describes a membership service system that allows various kinds of reservation services for registered cardholders using multiple contactless IC cards. In this system, one or more members can make reservations for airplane tickets, hote...
NISHITANI Takashi, SUZUKI Naobumi, NAGAI Yasuhiro
Proceedings of the IEICE General Conference   2000(1)    Mar 2000
YAMAMOTO Hideaki, SUZUKI Naobumi, NAGAI Yasuhiro
Proceedings of the Society Conference of IEICE   1999(1)    Aug 1999
SUZUKI Naobumi, OHTANI Yoshimitsu, NAGAI Yasuhiro
Proceedings of the Society Conference of IEICE   1999(1)    Aug 1999
Tsuru Koji, Murata Koushi, Ohtani Yoshimitsu, Nagai Yasuhiro, Shinagawa Mitsuru
Technical report of IEICE. RCS   99(141) 1-5   Jun 1999
A novel measurement of the resonance frequency for contactess IC cards is presented. The resonance frequency of the contactless IC card was difficult to precisely determined because of electro-magnetic coupling between the antenna in the card and ...
SUZUKI Naobumi, NAGAI Yasuhiro, OHTANI Yoshimitsu, ICHINOSE Yutaka
Proceedings of the Society Conference of IEICE   1997(1)    Aug 1997
SUZUKI Naobumi, NAGAI Yasuhiro, OHTANI Yoshimitsu, ICHINOSE Yutaka
Proceedings of the IEICE General Conference   1997(1)    Mar 1997
NAGAI Yasuhiro, SUZUKI Naobumi, KON Taichi, MIZUNO Hideki, SHINJI Masaaki, KIMURA Hidetoshi, YAMAMOTO Koichi
Proceedings of the IEICE General Conference   1997(1)    Mar 1997
NAGAI Yasuhiro, SUZUKI Naobumi, OHTANI Yoshimitsu, ICHINOSE Yutaka
Technical report of IEICE. RCS   96(354) 93-98   Nov 1996
A wireless tag system, in which an infrared (IR) beam and an electromagnetic wave with a radio frequency (RF) are used, has been developed for maintenance and management of outdoor communication facilities. The system was constructed using IR-RF t...
NAGAI Yasuhiro, OHTANI Yoshimitsu, SUZUKI Naobumi, ICHINOSE Yutaka
Proceedings of the Society Conference of IEICE   1996    Sep 1996
SUZUKI Naobumi, NAGAI Yasuhiro, OHTANI Yoshimitu, ICHINOSE Yutaka
Technical report of IEICE. SST   96(99) 43-48   Jun 1996
We examine the feasibility of applying wireless IC tags to a management system for facilities with metal parts. The magnetic field distribution in a hole formed in a metal plate is analyzed using the finite element method. The magnetic field inten...
SUZUKI Naobumi, NAGAI Yasuhiro, OHTANI Yoshimitsu, ICHINOSE Yutaka
Proceedings of the IEICE General Conference   1996(1)    Mar 1996
Ohtani Yoshimitsu, Nagai Yasuhiro, Suzuki Naobumi, Ichinose Yutaka
Proceedings of the IEICE General Conference   1996(1)    Mar 1996
NAGAI Yasuhiro, OHTANI Yoshimitsu, SUZUKI Naobumi, ICHINOSE Yutaka, KUMAHARA Norio
IEICE technical report. Electromagnetic compatibility   95(324) 71-76   Oct 1995
A new multi-functional card with a display, sounder and input keys, and related communication equipment, such as a microwave base station and a contactless surface reader/writer, have been developed to perform the functions of positioning, paging,...
Kumahara Norio, Ozeki Shinya, Nagai Yasuhiro
Proceedings of the Society Conference of IEICE   1995(2)    Sep 1995
NAGAI Yasuhiro, OHTANI Yoshimitu, SUZUKI Naobumi, ICHINOSE Yutaka, KUMAHARA Norio
Proceedings of the Society Conference of IEICE   1995(2)    Sep 1995
Hayashi T., Mikazuki T., Suzuki N., Nagai Y.
1994(2)    Sep 1994
Nagai Yasuhiro, Suzuki Naobumi, Michikami Osamu
Technical report of IEICE. SCE   94(8) 29-34   Apr 1994
The properties of thin-film thermal switches monolithicallyfabricated on high Tc superconductive filter were studied.Operating at a wide temperature range of 50-77K,it was found that the switch could control the center frequency by -10 MHz with a ...
Nagai Yasuhiro, Suzuki Naobumi, Michikami Osamu, VanDuzer Theodore, Hebert David
Technical report of IEICE. SCE   93(363) 37-42   Dec 1993
The properties of disk resonators and end-coupled disk filters were investigated.High quality factors of 60,000 at 3 GHz and 27, 000 at 7 GHz,respectively corresponding to TM_11> and TM_31> modes,were found in a Nb disk resonator with a diameter o...

Books etc

 
Kyoto City Large-Scale General-purpose Computer Open Project Review Committee Survey Report
NAGAI Yasuhiro
Jun 2017   
http://www2.city.kyoto.lg.jp/shikai/img/iinkai/soumushoubou/data/290703souki02.pdf

Conference Activities & Talks

 
Total Migration to Public Cloud of Office IT Systems at Kyoto University [Invited]
NAGAI Yasuhiro
12 Jun 2019   amazon

Works

 
A Study of Service Authorization System using Distributed RA and Single-sign-on Authentication Systems
2007

Research Grants & Projects

 
Certification, authentication and authorization
Project Year: 2006