久保田 周治

研究成果

年別の研究成果 1982 2017

• 1988 被引用数
• 18 h-index
• 217 Article
• 36 Conference contribution
• 19 Paper
• 12 Conference article
• 1 その他
  • 1 Review article

年別の研究成果

年別の研究成果

検索結果

• 1998

  Bit-stream-arranged weighted modulation scheme for low delay spread frequency selective fading channels

  Kobayashi, K. & Kubota, S., 1998, In: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. E81-A, 7, p. 1452-1458 7 p.

  研究成果: Article › 査読

  • Fading Channels 100%
  • Frequency selective fading 81%
  • Modulation 80%
  • Fading channels 61%
  • Voice 55%

• Low-power and high-quality signal transmission baseband LSIC for personal communications

  Kobayashi, K., Kubota, S., Enomoto, K., Seki, K., Kawazoe, K., Sakata, T., Matsumoto, Y. & Hattori, T., 1998, In: IEEE Transactions on Very Large Scale Integration (VLSI) Systems. 6, 4, p. 687-696 10 p.

  研究成果: Article › 査読

  • Differential pulse code modulation 100%
  • Integrated circuits 80%
  • Time division multiple access 49%
  • Modems 48%
  • Controllers 47%

• Prompt estimation of channel quality for personal communication systems

  Suzuki, M. & Kubota, S., 1998 9, In: Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi). 81, 9, p. 87-96 10 p.

  研究成果: Article › 査読

  • Personal communication systems 100%
  • Pulse code modulation 96%
  • Degradation 34%
  • Speech transmission 22%
  • Networks (circuits) 17%

• Realization of simple decoders for high-coding-rate convolutional codes

  Kawazoe, K. & Kubota, S., 1998 3, In: Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi). 81, 3, p. 47-56 10 p.

  研究成果: Article › 査読

  • Convolutional codes 100%
  • Convolution 80%
  • Decoding 34%
  • Electric power utilization 30%
  • Networks (circuits) 22%

• Realization of simple decoders for high-coding-rate convolutional codes

  Kawazoe, K. & Kubota, S., 1998 3, In: Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi). 81, 3, p. 47-56 10 p.

  研究成果: Article › 査読

  • Convolutional codes 100%
  • Convolution 80%
  • Decoding 34%
  • Electric power utilization 30%
  • Networks (circuits) 22%

• Routing management in asymmetric networks

  Miyata, S., Tanaka, T. & Kubota, S., 1998 12 1, In: NTT R and D. 47, 10, p. 1049-1056 8 p.

  研究成果: Article › 査読

  • Telephone lines 100%
  • Communication satellites 40%
  • Telecommunication links 34%
  • Satellites 28%
  • Network protocols 25%
  3 被引用数 (Scopus)

• Simultaneous ASCA and RXTE Observations of Cygnus X-1 during its 1996 State Transition

  Cui, W., Ebisawa, K., Dotani, T. & Kubota, A., 1998 2 1, In: The Astrophysical Journal. 493, p. L75-L78

  研究成果: Article › 査読

• Technology for reducing the power consumption of mobile/personal handheld terminals

  Hattori, T., Ogose, S., Kubota, S. & Kobayashi, K., 1998 3, In: Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi). 81, 3, p. 39-52 14 p.

  研究成果: Article › 査読

  • Electric power utilization 100%
  • hardware 86%
  • configurations 72%
  • trends 68%
  • Computer hardware 52%

• Technology for reducing the power consumption of mobile/personal handheld terminals

  Hattori, T., Ogose, S., Kubota, S. & Kobayashi, K., 1998 3, In: Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi). 81, 3, p. 39-52 14 p.

  研究成果: Article › 査読

  • Electric power utilization 100%
  • hardware 86%
  • configurations 72%
  • trends 68%
  • Computer hardware 52%

• The Electronic System for the ASTRO-E X-ray Detector

  Takahashi, T., Nomachi, M., Fukuzawa, Y., Tashiro, M., Ezawa, H., Hamaya, M., Isobe, M. H., ?33? ?41??15??, . . & Kubota, S., 1998 11 1, In: SPIE. 3445, p. 155-168

  研究成果: Article › 査読
• 1999

  ASCA observations of the X-ray transient YTE J1550-564 : change of accretion disk parameters

  Kubota, A., Marchall, F., Makishima, K., Dotani, T., Inoue, H. & Negoro, H., 1999 4 1, In: Astronomische Nachrichten. 320, p. 353

  研究成果: Article › 査読

• Fabrication of the ASTRO-E Hard X-Ray Detector

  Nakazawa, K., Kamae, T., Mikishima, K., Takahashi, T., Murakami, T., Tashiro, M., Fukuzawa, Y., Tamura, T., ?26? ?34??17??, . . & Kubota, S., 1999 10 1, In: SPIE. 3765, p. 148-159

  研究成果: Article › 査読

  21 被引用数 (Scopus)

• High capacity and wide coverage cell station for personal communication systems

  Kobayashi, K., Kumagai, T., Kubota, S., Ogose, S. & Hattori, T., 1999, In: IEICE Transactions on Communications. E82-B, 1, p. 112-118 7 p.

  研究成果: Article › 査読

  • Personal communication systems 100%
  • Demodulators 49%
  • Power transmission 39%
  • Transceivers 38%
  • Antennas 26%
  1 被引用数 (Scopus)

• Key Technology for Future Wireless Systems

  Kubota, S., Otsu, T. & Mizuno, H., 1999 12 1, In: Default journal. WS13-02, p. 377-382

  研究成果: Article › 査読

• Multicast Routing Protocols for Avoiding Congestion in Ad Hoc Wireless Network

  Takasugi, K. & Kubota, S., 1999 9 1, In: IEEE International Symposium on Personal Indoor Mobile Radio Communications (PIMRC'99).

  研究成果: Article › 査読

• Next Generation Wireless Communications

  Kubota, S., Otsu, T. & Mizuno, H., 1999 9 1, In: YRP他.

  研究成果: Article › 査読

• Preflight Performance of the Astro-E Hard X-ray Detector

  Tanihata, C., Kataoka, J., Makishima, K., Takehashi, T., Murakami, T., Tashiro, M., Fukuzawa, Y., Tamura, T., ?31? ?39?? 19??, . . . & Kubota, S., 1999 10 1, In: SPIE. 3765, p. 645-663

  研究成果: Article › 査読

  21 被引用数 (Scopus)
• 2000

  A High-accuracy Pedestrian Positioning Information System using Pico Cell Techniques

  Shibuya, A., Nakatsugawa, M., Kubota, S. & Ogawa, T., 2000 5 1, In: IEEE International Conference on Vehicle Technology (VTC'2000-S).

  研究成果: Article › 査読

  4 被引用数 (Scopus)

• An effective data transmission control method for mobile terminals in spot communication systems

  Yoshioka, H., Nakatsugawa, M. & Kubota, S., 2000 1 1, In: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. E82-A, 7, p. 1328-1337 10 p.

  研究成果: Article › 査読

  • Data Transmission 100%
  • Communication Systems 85%
  • Data communication systems 61%
  • Communication systems 54%
  • Quality of Service 42%
  5 被引用数 (Scopus)

• ASCA Observation of ultra-Luminous X-ray Source in the Nearby Spiral Galaxy NGC 2403

  Kotoku, J., Mizuno, T., Kubota, A. & Makishima, K., 2000 12 1, In: Publications of the Astronomical Society of Japan. 52, p. 1081-L1085

  研究成果: Article › 査読

  13 被引用数 (Scopus)

• A Study on an Over-the Air Download Scheme for Software Radios

  Shiba, H., Shono, T., Uehara, K. & Kubota, S., 2000 11 1, In: International Workshop on Mobile Multimedia Communications.

  研究成果: Article › 査読

• Common Carrier Activities in SDR: Prototype Implementation of SDR Systems

  Kubota, S., Uehara, K. & Nakatsugawa, M., 2000 4 1, In: Default journal. p. 161-173

  研究成果: Article › 査読

• New Flexible Security Systems on Software Radio and the Evaluation of the Performance of Algorithms for Electric Commerce on the Software Radio

  Sugita, M., Uehara, K. & Kubota, S., 2000 9 1, In: IEEE International Conference on Vehicle Technology (VTC'2000-F).

  研究成果: Article › 査読

• Pico Cell Network for Local Information and Positioning System

  Kudoh, E., Shibuya, A., Ogawa, T., Uchida, D., Nakatsugawa, M., Suda, H. & Kubota, S., 2000 10 1, In: Annual Conference of the IEEE Industrial Electronics Society (IECON'2000). p. 1165-1170

  研究成果: Article › 査読

• SDR Application for the Next Generation Wireless Access: Prototype Implementation

  Kubota, S., Uehara, K. & Nakatsugawa, M., 2000 9 1, In: Default journal.

  研究成果: Article › 査読

• Software Defined Radio Prototypes for Multimode Operation

  Suzuki, Y., Uehara, K., Nakatsugawa, M. & Kubota, S., 2000 11 1, In: Workshop on Personal Mobile Communications (WPMC'2000).

  研究成果: Article › 査読

• Software Radio Base and Personal Stations Prototypes

  Suzuki, Y., Uehara, K., Nakatsugawa, M., Shirato, Y. & Kubota, S., 2000 6 1, In: IEICE Transaction on Communications.

  研究成果: Article › 査読

  19 被引用数 (Scopus)

• The Nature of Ultra-Luminous Compact X-ray Sources in Nearby Spiral Galaxies

  Makishima, K., Kubota, A., Mizuno, T., Ohnishi, T., Tashiro, M., Aruga, Y., Asai, K., Dotani, T. & ?7?, ., 2000 6 1, In: The Astrophysical Journal. 535, p. 632-643

  研究成果: Article › 査読

• What is software radio communication

  Kubota, S., 2000 1 1, In: Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers. 54, 12, p. 1723-1724 2 p.

  研究成果: Article › 査読

  Open Access
• 2001

  A Feature Extraction Technique for Fading Channels to Achieve Automatic Modulation Recognition that Employs the Nearest Neigbor Rule

  Yoshioka, H., Shirato, Y., Nakatsugawa, M. & Kubota, S., 2001 1 1, In: URSI AP-RASC01.

  研究成果: Article › 査読

• Excess hard X-ray emission from the obscured low luminosity AGN in the nearby galaxy M 51 (NGC5194)

  Fukazawa, Y., Iyomoto, N., Kubota, A., Matsumoto, Y. & Makishima, K., 2001 7 1, In: Astronomy and Astrophysics. 374, p. 73-82

  研究成果: Article › 査読

• Normalized Least Square Method for Cellular-based Position Detection Services

  Shibuya, A., Nakatsugawa, M., Kubota, S., Kudoh, E. & Suda, H., 2001 7 1, In: Wireless'2001. p. 260-264

  研究成果: Article › 査読

• Proposal for system diversity on software defined radio

  Shono, T., Uehara, K. & Kubota, S., 2001 9, In: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. E84-A, 9, p. 2346-2358 13 p.

  研究成果: Article › 査読

  • Software Defined Radio 100%
  • Wireless Communication 31%
  • Communication Systems 28%
  • Communication systems 20%
  • Channel Capacity 16%
  12 被引用数 (Scopus)

• Proposal for System Diversity on Software-Defined Radio

  Shono, T., Kubota, S. & Uehara, K., 2001 9 1, In: IEICE Transaction on Fundamentals.

  研究成果: Article › 査読

  12 被引用数 (Scopus)

• Research and Development of Software-Defined Radio Technologies in Japan

  Nakajima, N., Kohno, R. & Kubota, S., 2001 8 1, In: Default journal. 39, p. 146-155

  研究成果: Article › 査読

  37 被引用数 (Scopus)

• Research and developments of software-defined radio technologies in Japan

  Nakajima, N., Kohno, R. & Kubota, S., 2001 8 1, In: IEEE Communications Magazine. 39, 8, p. 146-154 9 p.

  研究成果: Article › 査読

  • Mobile telecommunication systems 100%
  • Communication systems 68%
  • Computer hardware 50%
  • Communication 43%
  • Industry 37%
  37 被引用数 (Scopus)

• Spatially dependent response of thick and large are p-i-n diode for ASTRO-E hard X-ray detector

  Sugiho, M., Kamae, T., Makishima, K., Takehashi, T., Murakami, T., Tashiro, M., Fukazawa, T., Iyomoto, N. & Kubota, S., 2001 6 1, In: IEEE Trans. Nucl. Sci.. 48, p. 426-429

  研究成果: Article › 査読

  16 被引用数 (Scopus)

• Spectral transitions of X-ray sources in IC 342

  Kubota, A., Mizuno, T., Makishima, K., Fukuzawa, Y., Kotoku, J., Ohnishi, T. & Tashiro, M., 2001 2 1, In: The Astrophysical Journal. 547, p. L119-L122

  研究成果: Article › 査読

• Trends in the research and development of software radio

  Uehara, K., Nakatsugawa, M., Kubota, S. & Mizuno, H., 2001, In: NTT R and D. 50, 1, p. 33-40 8 p.

  研究成果: Article › 査読

  • Software radio 100%
  • Digital circuits 16%
  1 被引用数 (Scopus)

• X-ray Study of Optically Thick Accretion Disks Around Steel lar Black Holes - The Standard Accretion Disk and Beyo

  Kubota, A., Makishima, K. & Ebisawa, K., 2001 3 1, In: New Century of X-ray Astronomy. 251, p. 80

  研究成果: Article › 査読

• X-ray Study of Optically Thick Accretion Disks Around Stel Lar Black Holes

  Kubota, A., 2001 6 1, In: X-RAY EMISSION FROM ACCRETION ONTO BLACK HOLES.

  研究成果: Article › 査読
• 2002

  Another Interpretation of the Power-law type Spectrum of an Ultralunminous Compact X-ray Source in IC 342

  Kubota, A., Done, C. & Makishima, K., 2002 12 1, In: Monthly Notices of the Royal Astronomical Society. 337, p. L11-L15

  研究成果: Article › 査読

• Design and Performance Evaluation of Software Radio for PHS and IEEE802.11 Wireless LANs

  Uehara, K., Shiba, K. UH., Shono, T., Shirato, Y., Yoshioka, H., Nakatsugawa, M., Kubota, S. & Umehira, M., 2002 9 1, In: IEEE International Symposium on Personal Indoor Mobile Radio Communications（PIMRC'2002）.

  研究成果: Article › 査読

• Improvement on the Light Yield of a High-Z Inorganic Scintil lator GSO(Ce)

  Kamae, T., Fukazawa, Y., Isobe, N., Kokubun, M., Kubota, A., Osone, S., Takahashi, T. & H.Ishibashi, N. T., 2002 9 11, In: Nuclear Instruments and Methods in Physics Research Section A. 490, p. 456-464

  研究成果: Article › 査読

• Proposal and Performance Evaluation of System Diversity for Software Defined Radio

  Shono, T., Uehara, K. & Kubota, S., 2002 4 1, In: IEEE International Conference on Communications (ICC'2002). p. 490-496

  研究成果: Article › 査読
• 2003

  Accretion Disk Spectra of Ultraluminous X-ray Sources in Nearby Spiral Galaxies and Galactic Superluminal Jet

  Ebisawa, K., Zycki, P., Kubota, A., Mizuno, T. & Watarai, K., 2003 11 10, In: The Astrophysical Journal. 597, p. 780-797

  研究成果: Article › 査読

  78 被引用数 (Scopus)

• Discovery of A New X-Ray Jet of PKS2201 + 044 and Its Emission Mechanism

  Urry, C. M., VanDuyne, J., C.C.Cheung, C. C. C., R.M.Smbruna, R. M. S., J.E.Pesce, J. E. P., Maraschi, L., F.Tavecchio, F. T. & Kubota, S., 2003 3 24, In: Default journal.

  研究成果: Article › 査読

• Future Systems and Technologies for Broadband Wireless Access Services

  Matsue, M., Kubota, K., Hojo, H., Watanabe, W., Saito, S., Aikawa, A. & Sato, S., 2003 10 1, In: IEEE Topical Conference on Wireless Communication Technology 2003. p. 156-157

  研究成果: Article › 査読

  7 被引用数 (Scopus)

• Observational evidence for a high energy Compton cloud in GRO J1655-40

  Kobayashi, Y., Kubota, A., Nakazawa, K., Takahashi, T. & Makishima, K., 2003 2 1, In: Publications of the Astronomical Society of Japan. 55, p. 273-279

  研究成果: Article › 査読

  13 被引用数 (Scopus)

• Understanding of X-ray spectra of Black Hole Binaries in High State

  Kubota, A., 2003 10 28, In: Stellar, Intermediate and Supermassive Black Holes, Kyoto, Japan. No.155, p. 19-26

  研究成果: Article › 査読