Curriculum Vitaes

Takayuki Watanabe

  (渡辺 隆行)

Profile Information

Affiliation
-
Degree
理学博士

Contact information
nabelab.twcu.ac.jp
J-GLOBAL ID
200901010203996768
researchmap Member ID
1000282839

External link

http://www.linkedin.com/in/takayukiwatanabe


Major Papers

 44
  • Takayuki Watanabe
    63(1) 35-49, Jan, 2022  Peer-reviewedLead authorCorresponding author
  • 渡辺隆行, 吉川りな
    特許第6709427号, May, 2020  Peer-reviewedLead author
  • 渡辺隆行
    人間中心設計, 15(1) 1-4, Jun, 2019  Peer-reviewed
  • Takayuki Watanabe
    Communications in Computer and Information Science, 713 80-87, 2017  Peer-reviewed
    WCAG 2.0 has played an important role on Web accessibility. Evaluation of Web accessibility is carried out to conform to WCAG 2.0. Authors and evaluators consult specific techniques of WCAG 2.0 to achieve Web accessibility. Web accessibility, however, is not techniques issues but a communication problem. W3C/WAI has just started a task force to perform preliminary development of a new version of accessibility guidelines. So, now is a good time to reconsider Web accessibility guidelines which focus on communication problems of users. To have a rationale of requirements for upcoming version of Web accessibility guidelines, the proposed paper tries to draw a holistic view of Web accessibility in terms of communication model, which is derived from semiotics. This model uses triangle relationship, authors (developers), content, and users, of WAI model. Authors have a message they want to present to users. The message is encoded with Web technologies into content. Multi-modal content is decoded by user agents and assistive technologies to send a message as view-ports to users. You must notice that the relation between authors and content is unidirectional. The relation between content and users, however, is bidirectional. Users, who have a goal, interact with content through user agents and assistive technologies in a specific context of use. Based on this model, the following 4 points are discussed: (1) It is possible that users interact with content but it is not possible that users interact with authors, which makes communication difficult. (2) We must pay more attention to users’ goal and context when evaluating Web accessibility. (3) Evaluation guideline which does not focus on WCAG but approach Web accessibility from user side is needed. User-centered evaluation is important. (4) To compensate a lack of communication between authors and users, an intelligent content is needed.
  • Takayuki Watanabe
    ACM SIGACCESS, 104 30-42, 2012  Peer-reviewed
  • NISHIMOTO Takuya, WATANABE Takayuki
    The IEICE transactions on information and systems, 94(1) 209-220, Jan 1, 2011  Peer-reviewed
    視覚障害者のコンピュータ利用に適した超早口音声の音質を改善することが望まれている.しかし超早口音声の評価のためには,聞き手の慣れの効果の考慮が重要である.本研究では親密度を統制した超早口音声の聴取において(1)実験の途中での親密度条件の変化,(2)親密度に関する教示の有無,の要因が聞き手の課題への慣れに与える影響を検証した.約21モーラ/秒という超早口音声の聴取における了解度と心的負荷に着目した実験から,「慣れによって親密度が高いという自覚が促された場合に,特にトップダウン情報としての心的辞書へのアクセスが促進され,その結果として了解度が高くなり心的負荷が少なくなる」という仮説を支持する結果が得られた.
  • Takuya Nishimoto, Takayuki Watanabe
    11TH ANNUAL CONFERENCE OF THE INTERNATIONAL SPEECH COMMUNICATION ASSOCIATION 2010 (INTERSPEECH 2010), VOLS 1-2, 266-+, 2010  Peer-reviewed
    Audio CAPTCHA systems, which distinguish between software agents and human beings, are especially important for persons with visual disability. The popular approach is based on mixing-based methods (MBM), which use the mixed sounds of target speech and noises. We have proposed a deletion-based method (DBM) which uses the phonemic restoration effects. Our approach can control the difficulty of tasks simply by the masking ratio. In this paper, we propose a design principle of CAPTCHA, according to which the tasks should be designed so that the large difference of performance between the machines and human beings can be provided. We also show the experimental results that support the hypotheses as follows: (1) only using MBM, the degree of task difficulty can not be controlled easily, (2) using DBM, the degree of task difficulty and safeness of CAPTCHA system can be controlled easily.
  • Takuya Nishimoto, Takayuki Watanabe
    COMPUTERS HELPING PEOPLE WITH SPECIAL NEEDS, PROCEEDINGS, PT 1, 6179 368-+, 2010  Peer-reviewed
    Audio CAPTCHA systems, which distinguish between software agents and human beings, are especially important for persons with visual disability. The popular approach is based on mixing-based methods (MBM), which use the mixed sounds of target speech and noises. We have proposed a deletion-based method (DBM) which uses the phonemic restoration effects. Our approach can control the difficulty of tasks simply by the masking ratio. According to our design principle of CAPTCHA, the tasks should be designed so that the large difference of performance between the machines and human beings can be provided. In this paper, we show the experimental results that support the hypotheses as follows: (1) only using MBM, the degree of task difficulty can not be controlled easily, (2) using DBM, the degree of task difficulty and safeness of CAPTCHA system can be controlled easily.
  • Takayuki Watanabe
    Disability and Rehabilitation: Assistive Technology, 4(4) 236-247, 2009  Peer-reviewed
    Purpose.To evaluate if marking up heading elements of Web sites improves usability and accessibility. Method.Task completion times and questionnaire responses were collected from sighted and blind users for two kinds of Web sites: sites marked up appropriately with heading elements, and sites with the same visual appearance but with no heading elements marked up. The experiment was carried out with user agents that could navigate through heading elements. Results.1 Heading elements improved usability both for sighted and blind users in terms of significantly reduced task completion time and also higher user satisfaction with the structured site. 2 A significant difference in accessibility i.e., if reduction of task completion time is larger for blind users than sighted users was not observed when heading elements were marked up. The lack of significant effect in this case might have been due to blind users making use of the user-agent's navigation functions to find the target information efficiently when the heading elements were not present. Conclusions.A combination of content with heading elements marked up, user agents with functions that utilise structure markup, and users with sufficient knowledge about user agents functionality, improves usability for both sighted and blind users and may improve accessibility for blind users. © 2009 Informa UK Ltd All rights reserved.
  • Takuya Nishimoto, Yukika Kariya, Takayuki Watanabe
    Proceedings of Acoustics ‘08 Paris, 6119-6124, Jul, 2008  Peer-reviewed
  • Takuya Nishimoto, Takayuki Watanabe
    COMPUTERS HELPING PEOPLE WITH SPECIAL NEEDS, PROCEEDINGS, 5105 809-+, 2008  Peer-reviewed
    A prototype lunch delivery web system for visually impaired was developed based on the analysis of human (a visually impaired who wants to order a lunch) to human (a sighted person who helps the visually impaired to decide lunch by reading aloud lunch menu) dialog. Based on the analysis, a prototype system was developed, which consists of three steps: 1) rough selection, 2) selection of favorites, and 3) final selection. The evaluation of the prototype system is performed by the visually impaired only with synthesized speech and key-board. The results showed that our system is effective and easy to use.
  • Takayuki Watanabe, Masahiro Umegaki
    Universal Access in the Information Society, 6(3) 221-232, Nov, 2007  Peer-reviewed
    To determine how well user agents conform to UAAG 1.0, capabilities of user agents were investigated with UAAG 1.0 Test Suite. It was found that 20 Priority 1 checkpoints were met by all the user agents, while 12 Priority 1 checkpoints, relating to multimedia control and time-dependent interactions, were failed by all of them. The results showed that two major Japanese user agents did not have enough functions to navigate through the Web, whereas the latest ones did have those functions. These results show that there are user agents which meet many requirements of UAAG 1.0 but Web authors still have to pay attention to the capability of the user agents that are considered to be used to browse their content. © Springer-Verlag 2007.
  • Nishimoto T, Sako S, Sagayama S, Ohshima K, Oda K, Watanabe T
    Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference, 1 5691-5694, 2006  Peer-reviewed
  • Takayuki Watanabe, Masahiro Umegaki
    ACM International Conference Proceeding Series, 134 38-48, 2006  Peer-reviewed
    Capabilities of major Japanese user agents, three screen readers and one voice browser, were investigated with the following test files: W3C UAAG 1.0 Test Suite for HTML 4.01, an accessible PDF file, an accessible Flash file, and test files which test Japanese specific issues. Using the UAAG 1.0 Test Suite, 20 out of 48 Priority 1 checkpoints were met by all user agents, while all of the user agents failed to meet 11 of the checkpoints. Test results of all test files were assigned into three categories: capabilities satisfied by almost all user agents, capabilities not satisfied by any of the user agents, and capabilities that were satisfied by some of the user agents only. The test results indicated that 1) two major Japanese user agents do not have enough functions to navigate through a Web page using the structure information of the content, and 2) none of the user agents have enough functions to control multimedia and time-dependent interactions. These results provide an objective evidence to define the Japanese baseline, a set of technologies that a user agent is assumed to support, which is required in the WCAG 2.0 working draft. Accessibility responsibility between Web content and user agents is also determined by the current survey. Copyright 2006 ACM.
  • Takayuki Watanabe
    2005 76-86, 2005  Peer-reviewed
  • T. Watanabe
    Proceedings of 3rd Int. Conference Universal Access in Human-Computer Interaction, 8(CD-ROM), 2005  Peer-reviewed
  • T Watanabe
    HUMAN SOCIETY AND THE INTERNET, PROCEEDINGS, 2105 92-99, 2001  Peer-reviewed
    The Internet becomes a fundamental infrastructure of the current life. The fundamental technology must be accessible to anyone; otherwise, there arises a digital-divide between the people who can use these technologies and the people who cannot. We must resolve this problem by some means or many people are isolated from the society. To resolve a part of this problem, the author launched Bilingual Emacspeak Project. This open-source project develops a highly capable bilingual speech synthesis system for Japanese visually impaired computer users. In this paper, based on the experiences of Bilingual Emacspeak Project and other projects that concern well-being activities, the prospect, problems, and important points of resolving a digital-divide by open-source project assisted by the Internet is discussed in detail.
  • Takayuki Watanabe, Koichi Inoue, Mitsugu Sakamoto, Masanori Kiriake, Hirohiko Honda, Takuya Nishimoto, Tuneyoshi Kamae
    Universal Access In HCI: Towards an Information Society for All, Proceedings of HCI International '2001 (the 9th International Conference on Human-Computer Interaction), New Orleans, USA, August 5-10, 2001, Volume 3, 446-450, 2001  Peer-reviewed
  • Tuneyoshi Kamae, Hirohiko Honda, Takayuki Watanabe, Tomio Koide, Tohru Kurihara
    Universal Access In HCI: Towards an Information Society for All, Proceedings of HCI International '2001 (the 9th International Conference on Human-Computer Interaction), New Orleans, USA, August 5-10, 2001, Volume 3, 349-353, 2001  Peer-reviewed
  • W. Ootani, M. Minowa, K. Miuchi, T. Watanabe, Y. Ito, A. Takeda, Y. Inoue, Y. Ootuka
    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 436(1-2) 233-237, Oct 21, 1999  Peer-reviewed
    An experiment to search for hypothetical neutralino dark matter using lithium fluoride bolometer array is underway. This bolometer array consists of eight pieces of 21 g LiF bolometers. Fluorine has large sensitivity for axially coupled neutralino compared with other nuclei. We report on the first results from the pilot run in a shallow depth site (15 m w.e.). From the measured energy spectra the exclusion limits for the cross section of the elastic neutralino scattering off protons are evaluated.
  • W Ootani, M Minowa, K Miuchi, Y Inoue, T Watanabe, M Yoshida, Y Ito, Y Ootuka
    PHYSICS LETTERS B, 461(4) 371-375, Sep, 1999  Peer-reviewed
    An experiment to search for hypothetical particle dark matter using cryogenic thermal detector, or bolometer is ongoing. The bolometer consists of eight pieces of 21 g LiF absorbers and sensitive NTD germanium thermistors attached to them and is installed in the Nokogiriyama underground cell which is a shallow depth site (similar to 15 m w.e.). We report on the results from the first running for about ten days using this arrayed bolometer system together with appropriate shieldings and muon veto counters. From the obtained energy spectra the exclusion limits for the cross section of the elastic neutralino-proton scattering are derived under commonly accepted astrophysical assumptions. The sensitivity for the light neutralino with a mass below 5 GeV is improved by this work. (C) 1999 Published by Elsevier Science B,V. All rights reserved.
  • N Kudomi, H Ejiri, K Fushimi, K Hayashi, R Hazama, T Kishimoto, M Komori, K Kume, G Kunitomi, T Matsuoka, H Miyawaki, K Nagata, H Ohsumi, K Okada, T Shima, S Shiomi, K Takahisa, J Tanaka, K Tasaka, T Watanabe
    NUCLEAR PHYSICS A, 629(1-2) 527C-530C, Feb, 1998  Peer-reviewed
    Exclusive measurements of neutrino-less double beta decays(0 nu beta beta) of Mo-100 were made by means of ELEGANT V at Kamioka Underground Laboratory. Oto Cosmo Observatory has been constructed for underground laboratory for ELEGANT V and VI for the study of 0 nu beta beta of Mo-100 and Ca-48, search for dark matters and so on.
  • Wataru Ootani, Makoto Minowa, Takayuki Watanabe, Yutaka Ito, Yasuhiro Kishimoto, Kentaro Miuchi, Yoshizumi Inoue, Youiti Ootuka
    Astroparticle Physics, 9(4) 325-329, 1998  Peer-reviewed
    The performance of a 21-g lithium fluoride bolometer is presented. The background spectrum was measured in the surface laboratory. We derive an exclusion plot for the spin-dependent coupled Weakly Interacting Massive Particles (WIMPs) cross section. © 1998 Elsevier Science B.V.
  • Yutaka Ito, Makoto Minowa, Wataru Ootani, Keiji Nishigaki, Yasuhiro Kishimoto, Takayuki Watanabe, Youiti Ootuka
    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 386(2-3) 439-442, Feb 21, 1997  Peer-reviewed
    We developed a bolometer with a 0.5 g CdTe absorber using a high-sensitivity NTD germanium thermistor. An energy resolution of 24 keV (FWHM) is obtained for 0.66 to 1.8 MeV γ-rays. It shows a good linearity of the response in the energy range between 0.66 and 5.5 MeV. The gain is found to be stable for a period of 72 days of continuous operation and relatively insensitive to temperature changes of the refrigerator. The temperature change of the refrigerator for this period is within ± 1 mK. Since this material contains double positron emission (β+β+) nuclides 106Cd, 108Cd and 120Te, a new series of double beta decay experiments may become possible with this new method.
  • M Minowa, Y Ito, W Ootani, K Nishigaki, Y Kishimoto, T Watanabe, Y Inoue, Y Ootuka
    NUCLEAR PHYSICS B, 314-317, Nov, 1996  Peer-reviewed
    A direct dark matter search experiment is now under preparation at the University of Tokyo. An array of LiF bolometers with a total mass of roughly one kilogram is to be used aiming at a direct detection of spin-dependently interacting supersymmetric neutralinos. A dedicated low-radioactivity dilution refrigerator for the bolometer has been constructed along with a small on-line helium requefier to help the detector operation in the underground laboratory where liquid helium supply is not always available. A long term test operation of a bolometer at the University of Tokyo proved the stability of the detector for more than 45 days. The detector will be installed in the Nokogiri-yama underground laboratory of the Institute for Cosmic Ray Research of the University of Tokyo. The laboratory is 200 m w.e. deep and located about 60 km to the south of Tokyo.
  • Makoto Minowa, Yutaka Ito, Wataru Ootani, Keiji Nishigaki, Yasuhiro Kishimoto, Takayuki Watanabe, Yoshizumi Inoue, Youiti Ootuka
    Nuclear Physics B - Proceedings Supplements, 51(2) 314-317, Nov, 1996  Peer-reviewed
    A direct dark matter search experiment is now under preparation at the University of Tokyo. An array of LiF bolometers with a total mass of roughly one kilogram is to be used aiming at a direct detection of spin-dependently interacting supersymmetric neutralinos. A dedicated low-radioactivity dilution refrigerator for the bolometer has been constructed along with a small on-line helium requefier to help the detector operation in the underground laboratory where liquid helium supply is not always available. A long term test operation of a bolometer at the University of Tokyo proved the stability of the detector for more than 45 days. The detector will be installed in the Nokogiri-yama underground laboratory of the Institute for Cosmic Ray Research of the University of Tokyo. The laboratory is 200 m w.e. deep and located about 60 km to the south of Tokyo.
  • Makoto Minowa, Yutaka Ito, Wataru Ootani, Keiji Nishigaki, Takayuki Watanabe, Youiti Ootuka
    Journal of Low Temperature Physics, 93(3-4) 803-808, Nov, 1993  Peer-reviewed
    Bolometers are being developed at the University of Tokyo aiming at a search for galactic dark matter. We have succeeded in constructing a small-sized bolometer with 2.8 gram of lithium fluoride crystal with an rms energy resolution of 3.8 ke V for 60-ke V γ rays. Both lithium and fluorine are expected to be suitable for the detection of possible particle dark matter with a spin-dependent interaction like supersymmetric neutralinos. Fabrication of Neutron Transmutation Doped (NTD) germanium is also in progress to make a number of thermistors with uniform sensitivities to be used for multi-module bolometers. When the development of a full-sized detector with a total mass of order one kilogram is completed, we plan to install it in the Kamioka underground laboratory. © 1993 Plenum Publishing Corporation.
  • Makoto Minowa, Michiaki Sakamoto, Yutaka Ito, Takayuki Watanabe, Wataru Ootani, Youiti Ootuka
    Nuclear Inst. and Methods in Physics Research, A, 327(2-3) 612-614, Apr 1, 1993  Peer-reviewed
    A cryogenic thermal detector with a 2.8 g LiF crystal is constructed. A photoelectric peak of 60 keV γ-rays is clearly seen with LiF crystal with an RMS energy resolution of 3.8 keV. LiF is suitable for the detection of possible particle dark matter with a spin-dependent interaction like neutralinos since both Li and F are expected to have high interaction rates with such particles. © 1993.
  • N KUDOMI, T SHIMA, H EJIRI, J TANAKA, T WATANABE
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 322(1) 53-56, Oct, 1992  Peer-reviewed
    A large and thin source film with area of S almost-equal-to 10(3) cm2 and thickness of t is similar to 20 mg/cm2 has been fabricated for measuring nuclear rare decays. The uniformity is within 10%, and contaminations of U and Th radioactive isotopes are less than 0.5 ppb. It can be used for studying rare nuclear (beta) decays with decay rates of 10(-20)-10(-23) yr-1.
  • H EJIRI, K FUSHIMI, M KAWASAKI, H KINOSHITA, N KUDOMI, K KUME, K NAGATA, H OHSUMI, K OKADA, H SANO, T SHIBATA, T SHIMA, J TANAKA, T WATANABE
    NUCLEAR PHYSICS B, 258(1-2) 219-222, 1992  Peer-reviewed
    Double beta (betabeta) decays of Mo-100 and charge nonconserving (CNC) X-ray and gamma-ray transitions in I-127 were studied by means of ELEGANTS V.A finite half-life of T1/2(2nu) = 1.15(-0.20)+0.30 x 10(19)yr(68%CL) for the two neutrino betabeta decay and the lower limit of T1/2(0nu) > 7 x 10(21)yr(68%CL) for the neutrino-less betabeta decay were obtained. This corresponds to the mass limit of m(nu) < 7eV. Lower limits on the mean fives of the CNC inelastic and elastic processes, I-127 + e(K) --> I-127* + nu and I-127 + e(K) --> I-127 + nu were obtained as tau > 5.8 x 10(22)yr and tau > 1.2 . 10(23)yr, respectively. Upper limits on the ratios of the CNC strengths to the charge conserving ones for the weak and electromagnetic processes were obtained as epsilon(W)2 < 3.0 x 10(-30) and epsilon(gamma)2 < 1.5 x 10(-46), respectively.
  • H EJIRI, K FUSHIMI, M KAWASAKI, H KINOSHITA, N KUDOMI, K KUME, K NAGATA, H OHSUMI, K OKADA, H SANO, T SHIBATA, T SHIMA, J TANAKA, T WATANABE
    NUCLEAR PHYSICS B, 28(1) 219-222, 1992  Peer-reviewed
    Double beta (betabeta) decays of Mo-100 and charge nonconserving (CNC) X-ray and gamma-ray transitions in I-127 were studied by means of ELEGANTS V.A finite half-life of T1/2(2nu) = 1.15(-0.20)+0.30 x 10(19)yr(68%CL) for the two neutrino betabeta decay and the lower limit of T1/2(0nu) > 7 x 10(21)yr(68%CL) for the neutrino-less betabeta decay were obtained. This corresponds to the mass limit of m(nu) < 7eV. Lower limits on the mean fives of the CNC inelastic and elastic processes, I-127 + e(K) --> I-127* + nu and I-127 + e(K) --> I-127 + nu were obtained as tau > 5.8 x 10(22)yr and tau > 1.2 . 10(23)yr, respectively. Upper limits on the ratios of the CNC strengths to the charge conserving ones for the weak and electromagnetic processes were obtained as epsilon(W)2 < 3.0 x 10(-30) and epsilon(gamma)2 < 1.5 x 10(-46), respectively.
  • H EJIRI, K FUSHIMI, T KAMADA, H KINOSHITA, H KOBIKI, H OHSUMI, K OKADA, H SANO, T SHIBATA, T SHIMA, N TANABE, J TANAKA, T TANIGUCHI, T WATANABE, N YAMAMOTO
    PHYSICS LETTERS B, 258(1-2) 17-23, Apr, 1991  Peer-reviewed
    Double beta (beta-beta) decays of Mo-100 were studied by means of ELEGANTS V. A finite half-life of T1/2(2v) = (1.15(-0.20)+0.30) X 10(19) yr (68% CL) for 2v-beta-beta decay and the most stringent lower limit of T1/2(0v) > 4.7 X 10(21) yr (68% CL) on the half-life for the 0v-beta-beta decay were obtained. The observed T1/2(2v) indicates very severe cancellation of the components of the relevant nuclear matrix element.
  • H EJIRI, K HIGA, T KAMADA, H KOBIKI, K MATSUOKA, K OKADA, H SANO, T SHIBATA, T SHIMA, N TANABE, J TANAKA, T TANIGUCHI, T WATANABE, N YAMAMOTO
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 302(2) 304-314, Apr, 1991  Peer-reviewed
    The high sensitivity beta-gamma spectrometer ELEGANTS V (ELEctron GAmma-ray Neu Trino Spectrometer V) has been developed primarily for studying rare double-beta decays. It is a low background high sensitivity detector for low energy beta (beta), electron (e) and gamma (gamma) decays. ELEGANTS V is shown to be useful for the study of ultrarare nuclear beta(e), beta-beta(ee), beta(e)gamma and beta-beta(ee)gamma decays with decay rates of the order of T approximately 10(-27-30) s-1 (t1/2 approximately 10(20-23 yr).
  • T. Watanabe, H. Ejiri, K. Okada, N. Kamikubota, H. Sano, T. Shima, J. Tanaka, K. Fushimi, H. Kinoshita, Y. Nagai, T. Shibata
    Journal of Physics G: Nuclear and Particle Physics, 17(1) S217-S220, 1991  Peer-reviewed
    The normal double beta decay with two neutrinos (2 nu beta beta ) has been studied for 100Mo in order to study experimentally the 2 nu beta beta nuclear matrix element (M2 nu). A low background spectrometer, ELEGANTS-IV, which consists of eleven Si(Li) beta -detectors and surrounding 4 pi -NaI(Tl) gamma -detectors, has been used for the present experiment. natMo and 94% enriched 100Mo source-disks have been measured simultaneously for 8006 hours. A lower limit for the 2 nu half-life was obtained as 7.9(6.2)*1018 years at the 68(90)% confidence level. The present experiment suggests a finite 2 nu half-life of the order of 1019 years. However, it is necessary to estimate the contribution from contamination in the 100Mo disks by a Monte Carlo calculation.
  • T WATANABE, H EJIRI, K OKADA, N KAMIKUBOTA, H SANO, T SHIMA, J TANAKA, K FUSHIMI, H KINOSHITA, Y NAGAI, T SHIBATA
    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 17(Supplement) S217-S220, 1991  Peer-reviewed
    The normal double beta decay with two neutrinos (2-nu-beta-beta) has been studied for Mo-100 in order to study experimentally the 2-nu-beta-beta nuclear matrix element (M2-nu). A low background spectrometer, ELEGANTS-IV, which consists of eleven Si(Li) beta-detectors and surrounding 4-pi-NaI (Tl) gamma-detectors, has been used for the present experiment. (nat)Mo and 94% enriched Mo-100 source-disks have been measured simultaneously for 8006 hours. A lower limit for the 2-nu half-life was obtained as 7.9(6.2) x 10(18) years at the 68(90) % confidence level. The present experiment suggests a finite 2-nu half-life of the order of 10(19) years. However, it is necessary to estimate the contribution from contamination in the Mo-100 disks by a Monte Carlo calculation.
  • H EJIRI, K FUSHIMI, M KAWASAKI, H KINOSHITA, H OHSUMI, K OKADA, H SANO, T SHIMA, E TAKASUGI, J TANAKA, T WATANABE
    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 17(Supplement) S155-S164, 1991  Peer-reviewed
    Double beta (beta-beta) decays of Mo-100 and charge nonconserving excitations of I-127 were studied by means of ELEGANTS V. A finite half-life of T1/2(2-nu) = 1.15(-0.20)+0.30 x 10(19)y (68 % CL) for the two neutrino beta-beta-decay of Mo-100 and the most stringent lower limit of T1/2(0-nu) > 4.7 x 10(21) y (68 % CL) on the half-life for the neutrino-less beta-beta-decay of Mo-100 were obtained. Lower limits on the mean life of the charge nonconserving (CNC) processes I-127 + e(K) --> I-127* + nu leading to the first excited states of I-127 were obtained as tau > 1.1 x 10(23)y by searching for the gamma-decay.
  • H EJIRI, T KAMADA, T KOBIKI, K OKADA, H SANO, T SHIBATA, T SHIMA, N TANABE, J TANAKA, T WATANABE, N YAMAMOTO
    WEAK AND ELECTROMAGNETIC INTERACTIONS IN NUCLEI /, 691-693, 1989  Peer-reviewed
  • K OKADA, H EJIRI, T SHIBATA, Y NAGAI, N TAKAHASHI, N KAMIKUBOTA, T WATANABE, T SHIMA, J TANAKA, T TANIGUCHI, T KAMADA, M KOBIKI
    NUCLEAR PHYSICS A, 478(29) C447-C452, Feb, 1988  Peer-reviewed
  • H EJIRI, N KAMIKUBOTA, Y NAGAI, T NAKAMURA, K OKADA, T SHIBATA, T SHIMA, N TAKAHASHI, T WATANABE
    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 13(6) 839-846, Jun, 1987  Peer-reviewed
  • H. Ejiri, N. Kamikubota, Y. Nagai, T. Nakamura, K. Okada, T. Shibata, T. Shima, N. Takahashi, T. Watanabe
    Journal of Physics G: Nuclear Physics, 13(6) 839-846, 1987  Peer-reviewed
    Double beta decays ( beta beta ) from the 76Ge ground state (0+) to the 0+ and 2+ states in 76Se have been studied by means of a 171 cm3 Ge detector surrounded by a 4 pi -geometry NaI detector for 8621 h at the Kamioka underground laboratory. All beta -ray signals from the Ge detector and gamma -ray ones from the NaI detector were recorded on magnetic tape with a list mode, and were used to select candidates of beta beta events from background events. Lower limits on the neutrinoless double beta decays (0 nu beta beta ) are obtained as T 12/0 nu0+ to 0+)&gt 0. 73*1023 year and T12/0 nu(0+ to 2+)&gt 0.57*1023 year at the 68% confidence level (CL). The limit on T12/0 nu(0+ to 0 +) gives an upper limit on the Majorana neutrino mass of (m nu)&lt 1.8-4.7 eV, depending on the matrix elements used. The 0 + to 2+ 0 nu beta beta is due to the right-handed weak current. The present value gives the most stringent limit on the T 12/0 nu(0+ to 2+). The lower limit on the half-life for the 0+ to 0+ 0 nu beta beta process accompanied by the Majoron is T12/0 nu M(0+ to 0+)&gt 2*1020 year. This leads to an upper limit on the coupling strength with the Majoron field as mod (gB) mod &lt (0.7-1.8)*10-3. The lower limit on the half-life for the two-neutrino beta beta is T12/2 nu(0+ to 0 +)&gt 1*1020 year.
  • N KAMIKUBOTA, H EJIRI, T SHIBATA, Y NAGAI, K OKADA, T WATANABE, T IRIE, Y ITOH, T NAKAMURA, N TAKAHASHI
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 245(2-3) 379-392, May, 1986  Peer-reviewed
  • H EJIRI, N TAKAHASHI, T SHIBATA, Y NAGAI, K OKADA, N KAMIKUBOTA, T WATANABE, T IRIE, Y ITOH, T NAKAMURA
    NUCLEAR PHYSICS A, 448(2) 271-279, Jan, 1986  Peer-reviewed

Misc.

 102
  • 渡辺隆行
    日本デザイン学会第70回研究発表大会 梗概, Jun, 2023  Lead author
  • 渡辺隆行
    Scheem-D(大学教育のデジタライゼーション・イニシアティブ,文部科学省高等教育局専門教育課), Oct, 2022  Lead author
    文科省の管理下にある順応型組織の大学で生じている様々な教育課題を解決するために、ブロックチェーンの技術を使って大学を多元型・進化型組織の「Web3大学」に進化させ、自律分散化した大学教員コミュニティの自由な競争と、大学の壁を超えた自由な教育の提供と履修により教育を向上させることを目指しています。
  • 渡辺隆行
    日本繊維製品消費科学会 2020年年次大会・研究発表要旨, 35-35, Jun, 2020  Lead author
  • Mifuyu Nukaga, Hibiki Matsumoto, Haruru Mitobe, Takayuki Watanabe
    119(478) 45-50, Mar, 2020  
  • 荒井優希, 山田璃々夏, 渡辺隆行
    電子情報通信学会技術研究報告, 117(502(WIT2017 66-91)) 95‐102, Mar 2, 2018  

Books and Other Publications

 8

Presentations

 9
  • 渡辺隆行
    日本Webアクセシビリティ推進協会 セミナー, May 26, 2017  Invited
  • 渡辺隆行
    規格の策定者が解説する JIS X 8341-3:2010, Sep, 2010, 情報通信アクセス協議会・ウェブアクセシビリティ基盤委員会,ITRC(日本学術振興会産学協力研究委員会・インターネット技術第163委員会)・ UAI研究会  Invited
    1) 改正版JIS策定の背景 2) JIS改正原案を作成中に気付いた課題と対処 3) 基盤委員会の立ち上げと概要 4) 「JIS X 8341-3:2010 解説」から ・公開資料の使い方 ・ウェブアクセシビリティ概論 5) 規格票を見ながら ・改正版JISの特徴 ・主な箇条の説明
  • 渡辺隆行
    TCシンポジウム2010, Aug, 2010, テクニカルコミュニケーター協会  Invited
    1. ウェブの可能性 2. ウェブアクセシビリティ概論 3. JIS X 8341-3:2010の概要 4. JIS X 8341-3:2010に対応したコンテンツ作成 5. 達成基準を満たすコンテンツを作成する例 6. JIS X 8341-3:2010に対応した試験 7. ウェブアクセシビリティ基盤委員会が公開している資料の使い方 8. おわりに
  • 渡辺隆行
    ウェブアクセシビリティ推進協会発足イベント, Apr, 2010  Invited
  • 渡辺隆行
    第16回ヒューマンインタフェース学会セミナー 「改正迫るウェブアクセシビリティの規格(JIS X 8341-3)の改正のポイントと動向」, Dec, 2009, ヒューマンインタフェース学会
    2004年に制定されたウェブコンテンツのアクセシビリティ規格JIS X 8341-3が,今年度中に改正される予定です。JIS X 8341-3の改正原案はW3CのWCAG 2.0(Web Content Accessibility Guidelines 2.0)を含んでいますので,技術に依存しない形で要求事項をまとめている,客観的評価が可能な形で要求事項を記述している,認知障害・言語障害・学習障害にも配慮している,などの特徴を持っています。一方、改正版JISに基づいたウェブコンテンツを作成するためは、技術非依存に書かれた要求事項(達成基準)を(X)HTMLやCSSなどの個々の技術でどのように実装できるのか,日本の支援技術はその実装方法をサポートしているのか,適合性評価はどのように行えばよいのか,などの情報が必要となります。本セミナでは、JIS X 8341-3の改正原案作成に携わった先生方をお迎えし、JIS改正原案の紹介,改正のポイントと課題、今どのような取り組みが進んでいるかをお話ししていただきます。質疑応答の時間も長めに設定しましたので、ぜひ、この機会に新しいJIS X 8341-3に関する疑問を解決してください。
  • 渡辺隆行
    学振産学連携ITRC研究会, May, 2009
  • 渡辺隆行, 西本卓也, 中村精親, 辻勝利, 福田健太郎
    第45回 福祉情報工学研究会 特別企画, Dec, 2008  Invited
    World Wide Webはユニバーサルなメディアとして設計されており、例えば視覚障害者は合成音声によってWebを利用することができるが、現実には高齢者や障害者にとって使いにくいWebサイトがたくさんある。そこでWebコンテンツのアクセシビリティに関する標準化活動が行われており、海外では W3C WCAG 2.0 の策定が完了間近になっており、これを受けて日本でも JIS X 8341-3 の改訂作業が進められている。 Webアクセシビリティの新たな標準が受け入れられるために必要なのは、 Webコンテンツの新しい標準技術を生かすことができる支援技術である。 本特別企画はまずWebアクセシビリティ標準化活動の現状を概説し、続いてWebアクセシビリティを実現する高性能なツールになりうる以下のオープンソースソフトウェアを実演を交えて紹介する。 * スクリーンリーダー NVDA 日本語化プロジェクト * 音声対話ツールキット Galatea プロジェクト * アクセシビリティソフトウェア基盤 Eclipse Accessibility Tools Framework (ACTF) 最後にパネルディスカッションを行い、Webアクセシビリティ関連のオープンソースプロジェクトの展望や今後の課題について議論したい。支援技術ユーザ、研究者、ソフトウェア開発者など幅広い聴衆の参加を期待する。
  • 渡辺隆行, 辻, 植木真
    辻ちゃん・ウエちゃんのアクセシビリティPodcast, Dec, 2008  Invited
  • 渡辺隆行, 梅垣正宏
    ヒューマンインタフェース学会 SIGACI 2008年第4会研究談話会, Nov, 2008  Invited

Teaching Experience

 13

Research Projects

 8

Other

 10
  • - Present
    ・特定非営利活動法人ウェブアクセシビリティ推進協会(JWAC)・理事長 ・特定非営利活動法人 支援技術開発機構(ATDO)理事 ・令和4年度総務省調査研究「障害者の利便増進に資するICT機器等の利活用推進に関する調査研究」電子書籍サイトのアクセシビリティ向上に資する検討会・座長(2022年10月~2023年3月)
  • ・特定非営利活動法人ウェブアクセシビリティ推進協会(JWAC)・理事長 ・日本学術振興会 産学協力インターネット技術研究委員会(ITRC)UAT分科会 副査 ・特定非営利活動法人 支援技術開発機構(ATDO)理事
  • 2003年度 * 電子情報通信学会 福祉情報工学研究専門委員会 専門委員 * (財)日本規格協会 情報技術標準化研究センター 情報技術分野共通及びソフトウェア製品のアクセシビリティの向上に関する標準化調査研究(WG2(Webアクセシビリティ)委員)(2003年7月から) * 日本学術振興会 産学協力インターネット技術研究委員会 「高齢者と障害者のインターネット利用分科会」主査 * 慶應義塾大学 政策メディア研究科の大学院プロジェクト科目非常勤講師
  • 2004年度 * 電子情報通信学会 福祉情報工学研究専門委員会 専門委員 * (財)日本規格協会 情報技術標準化研究センター 情報アクセシビリティの国際標準化調査研究委員会(親委員会委員、WG2(Webアクセシビリティ)主査) * W3C Web Content Accessibility Guidelines Working Group 参加者 * 日本学術振興会 産学協力インターネット技術研究委員会 「高齢者と障害者のインターネット利用分科会」主査 * 慶應義塾大学 政策メディア研究科の大学院プロジェクト科目非常勤講師
  • 2005年度 * (財)日本規格協会 情報技術標準化研究センター 情報アクセシビリティの国際標準化調査研究委員会(本委員会委員、 WG2(Webアクセシビリティ)主査) * (独)情報通信研究機構 高度通信・放送研究開発委託研究評価委員会 専門委員 * 総務省「公共分野におけるアクセシビリティの確保に関する研究会」構成員 * W3C Web Content Accessibility Guidelines Working Group 参加者 * 日本学術振興会 産学協力インターネット技術研究委員会 「高齢者と障害者のインターネット利用分科会」主査 * 慶應義塾大学 政策メディア研究科の大学院プロジェクト科目非常勤講師