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29th International Cosmic Ray Conference, ICRC 2005

作者： Amenomori, M. Ayabe, S. Chen, D. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huang, Q. Jia, H.Y. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Saito, T. Sakata, M. Sasaki, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Yuan, A.F. Yuda, T. Zhang, H.M. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys. Chinese Academy of Sciences Institute of High Energy Physics Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute of Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

The Tibet air shower array has been in operation since 1999 as Tibet III with an energy threshold of a few TeV. As primary cosmic rays are shielded by the Moon having the finite size of 0.5° in diameter, we observe a deficit in cosmic rays called the Moon's shadow with a significance of 40 α level for 1041 live days. The center of the Moon's shadow shifts westward depending on primary cosmic-ray energies due to the geomagnetic field. We calibrate the absolute energy scale of the primary cosmic rays observed by the Tibet III array using this effect. The Moon's shadow simulation, including a precise calculation of the geomagnetic effect, shows a good agreement with observational data. As a result, the systematic error in the absolute energy scale is estimated to be less than approximately ± 8% level by means of the geomagnetic field as a spectrometer.

关键词： Cosmic rays

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Search for TeV transient gamma-ray sources of the northern sky using the Tibet- III air shower array

Search for TeV transient gamma-ray sources of the northern s...

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29th International Cosmic Ray Conference, ICRC 2005

作者： Amenomori, M. Ayabe, S. Chen, D. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huang, Q. Jia, H.Y. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Saito, T. Sakata, M. Sasaki, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Yuan, A.F. Yuda, T. Zhang, H.M. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki Univ Ersity Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute of Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

The Tibet III air shower array has a wide field of view greater than one steradian and a high duty cycle. Using the Tibet III (Nov. 1999 - Oct. 2004) data, we search for TeV transient gamma-ray point sources on the time scale of 120 days, 30 days, 10 days and 3 days. No new source was found at sufficiently high significance on any time scale in the field of view during the live time. The 90% confidence level upper limits on the integral flux above 3 TeV assuming an energy spectrum of E-1.6 and of E-1.0 are obtained.

关键词： Gamma rays

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The energy spectrum of the light components (P+He) at the knee obtained by the Tibet air shower core detector

The energy spectrum of the light components (P+He) at the kn...

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29th International Cosmic Ray Conference, ICRC 2005

作者： Katayose, Y. Amenomori, M. Ayabe, S. Chen, D. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huang, Q. Jia, H.Y. Kajino, F. Kasahara, K. Kato, C. Kawata, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Saito, T. Sakata, M. Sasaki, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Yuan, A.F. Yuda, T. Zhang, H.M. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys. Chinese Academy of Sciences Institute of High Energy Physics Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute of Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

A hybrid experiment was carried out to study the cosmic-ray primary composition in the 'knee' energy region. The experimental set-up consists of the Tibet-II air shower array( AS ), the emulsion chamber ( EC ) and the burst detector ( BD ) which are operated simulteneously and provides us information on the primary species. For three-year operation, we have observed 177 γ -families ( ∑Eγ 20 TeV ) accompanying air showers with the shower size Ne≥ × 105. Using this data set and a neural network method to select proton and helium induced events, the primary proton and helium energy spectra are obtained between 1015 and 10 16. The proton spectrum, thus obtained, can be expressed by a single power-law function with a differential index of -3.01 ± 0.11 and -3.05 ± 0.12 based on the QGSJET+HD and SIBYLL+HD models, respectively, which are steeper than that extrapolated from the direct observations of -2.74 ± 0.01 vin the energy range below (1014eV. Our experiment suggests that the main component responsible for making the knee structure of the all-particle spectrum is composed of nuclei heavier than helium.

关键词： Helium

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Sidereal anisotropy of galactic cosmic-ray intensity observed with the Tibet air shower array

Sidereal anisotropy of galactic cosmic-ray intensity observe...

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29th International Cosmic Ray Conference, ICRC 2005

作者： Kawata, K. Amenomori, M. Ayabe, S. Chen, D. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huang, Q. Jia, H.Y. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Saito, T. Saito, T.Y. Sakata, M. Sasaki, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Yuan, A.F. Yuda, T. Zhang, H.M. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys. Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute of Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

We report the large-scale sidereal anisotropy of galactic cosmic-ray intensity in the multi-TeV region obtained with the Tibet III air shower array in the period from 1999 through 2003. The sidereal daily variation of cosmic rays observed with Tibet III clearly indicates the excess of relative intensity around 4 ∼ 7 hours local sidereal time, as well as the deficit around 12 hours local sidereal time. The amplitude of the excess is not significant when averaged over the declination, however it becomes larger and clearer as the declination of viewing direction moves toward the south. The maximum phase of the excess intensity shifts from ∼ 7 to ∼ 4 hours according to the declination moving from the northern hemisphere to the equatorial region. Furthermore.

关键词： Anisotropy

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An upper limit on cosmic-ray p¯/p flux ratio estimated by the Moon's shadow with the Tibet III air shower array

An upper limit on cosmic-ray p¯/p flux ratio estimated by t...

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29th International Cosmic Ray Conference, ICRC 2005

作者： Amenomori, M. Ayabe, S. Chen, D. Cui, W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Ohta, I. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huang, Q. Jia, H.Y. Kajino, F. Saito, T. Katayose, Y. Kato, C. Kasahara, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Kawata, K. Zhaxisangzhu Sasaki, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Zhang, H.M. Tateyama, N. Torii, S. Tsuchiya, H. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Takita, M. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Udo, S. Yuda, T. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Yi Sakata, M. Yuan, A.F. Tan, Y.H. Hibino, K. Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys. Chinese Academy of Sciences Institute of High Energy Physics Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute of Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

The Tibet air shower array has been in operation since 1999 as Tibet III (22,050m2) with energy threshold of a few TeV. As primary cosmic rays are shielded by the Moon having the finite size of 0.5 degree in diameter, we observe a deficit in cosmic rays called the Moon's shadow with sufficient statistical significance. The center of the Moon's shadow shifts westwardly due to the geomagnetic field. By analyzing this energy-dependent westward displacement carefully, we set an upper limit of about 5% at 90% confidence level on the cosmic-ray antiproton/proton ratio at multi-TeV energies.

关键词： Cosmic rays

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Two dimensional observation on TeV Cosmic-ray large scale anisotropy using the Tibet Air Shower Array

Two dimensional observation on TeV Cosmic-ray large scale an...

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29th International Cosmic Ray Conference, ICRC 2005

作者： Amenomori, M. Ayabe, S. Chen, D. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Z.Y. Gao, X.Y. Geng, Q.X. Guo, H.W. He, H.H. He, M. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Huang, Q. Jia, H.Y. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. labaciren Le, G.M. Li, J.Y. Lu, H. Lu, S.L. Meng, X.R. Mizutani, K. Mu, J. Munakata, K. Nagai, A. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Onuma, H. Ouchi, T. Ozawa, S. Ren, J.R. Saito, T. Sakata, M. Sasaki, T. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wang, X. Wang, Y.G. Wu, H.R. Xue, L. Yamamoto, Y. Yan, C.T. Yang, X.C. Yasue, S. Ye, Z.H. Yu, G.C. Yuan, A.F. Yuda, T. Zhang, H.M. Zhang, J.L. Zhang, N.J. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Department of Physics Saitama University Saitama 338-8570 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Key Lab. of Particle Astrophys. Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics South West Jiaotong University Chengdu 610031 China Department of Physics Yunnan University Kunming 650091 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Konan University Kobe 658-8501 Japan Faculty of Systems Engineering Shibaura Institute of Technology Saitama 337-8570 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Center of Space Science and Application Research Chinese Academy of Sciences Beijing 100080 China Advanced Media Network Center Utsunomiya University Utsunomiya 321-8585 Japan National Institute of Informatics Tokyo 101-8430 Japan Tokyo Metropolitan College of Aeronautical Engineering Tokyo 116-0003 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan RIKEN Wako 351-0198 Japan

The two-dimensional large scale anisotropy of cosmic-ray intensity in a magnitude about 0.1% is observed in TeV energy range using data taken from Tibet-III (Nov.1999-Oct.2003). The anisotropy due to the terrestrial o... 详细信息

关键词： Anisotropy

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Extraterrestrial Subsurface technology Test Bed: Human Use and Scientific Value of Martian Caves

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AIP Conference Proceedings 2004年第1期699卷

作者： P. J. Boston R. D. Frederick S. M. Welch J. Werker T. R. Meyer B. Sprungman V. Hildreth‐Werker S. L. Thompson Earth & Environmental Sciences Dept. New Mexico Institute of Mining and Technology 801 Leroy Place Socorro NM 87801 Complex Systems Research Inc. Boulder CO 80306 Oregon Public Education Network Clearinghouse Silverton OR Boulder Center for Science and Policy Boulder CO Space Data Resources and Information Boulder CO Southwest Composites Hillsboro NM Lawrence Livermore Nat. Lab. Livermore CA

Caves and subsurface voids on Mars and other bodies can provide significant advantages when used for human habitat and operational space. They are also targets for significant scientific investigations. We have developed a suite of technology concepts to make utilization of extraterrestrial caves feasible. Our goal is to provide a solid foundation of information and options so that mission planners may realistically consider the subsurface option in development of mission scenarios. We have concentrated on identifying the primary challenges to human operation in the extraterrestrial cave environment. Employing concepts like inflatable cave liner habitats, foamed‐in‐place airlock technologies, and micro‐robotic self‐deploying communication, mapping, and data transmission networks, we are developing solutions to meet those challenges and demonstrate the feasibility of cave use on Mars. We present the results of field trials of an incave mission simulation in several Earth caves as a proof‐of‐concept demonstration. These trials during the summer and fall of 2003 culminate in a high fidelity simulation scheduled for January 2004. Concepts and prototypes were developed during a completed Phase I and on‐going Phase II NASA Institute for Advanced Concepts (NIAC) study.

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Remote sensing image compression for deep space based on region of interest

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Journal of Harbin Institute of technology(New Series) 2003年第3期10卷 300-303页

作者：王振华吴伟仁田玉龙田金文柳健 Institute for Pattern Recognition and Artificial Intelligence State Key Lab for Image Processing and Intelligent ControlHuazhong University of Science and Technology Wuhan 430074 China Institute for Pattern Recognition and Artificial Intelligence State Key Lab for Image Processing and Intelligent ControlHuazhong University of Science and Technology Wuhan 430074 China major limitation for deep space communication is the limited bandwidths available. The downlink rate using X-band with an L2 halo orbit is estimated to be of only 5.35 GB/d. However the Next Generation Space Telescope (NGST) will produce about 600 GB/d. Clearly the volume of data to downlink must be reduced by at least a factor of 100. One of the resolutions is to encode the data using very low bit rate image compression techniques. An very low bit rate image compression method based on region of interest(ROI) has been proposed for deep space image. The conventional image compression algorithms which encode the original data without any data analysis can maintain very good details and haven't high compression rate while the modern image compressions with semantic organization can have high compression rate even to be hundred and can't maintain too much details. The algorithms based on region of interest inheriting from the two previews algorithms have good semantic features and high fidelity and is therefore suitable for applications at a low bit rate. The proposed method extracts the region of interest by texture analysis after wavelet transform and gains optimal local quality with bit rate control. The Result shows that our method can maintain more details in ROI than general image compression algorithm(SPIHT) under the condition of sacrificing the quality of other uninterested areas

A major limitation for deep space communication is the limited bandwidths available. The downlinkrate using X-band with an L2 halo orbit is estimated to be of only 5.35 GB/d. However, the Next GenerationSpace Telescope (NGST) will produce about 600 GB/d. Clearly the volume of data to downlink must be re-duced by at least a factor of 100. One of the resolutions is to encode the data using very low bit rate image com-pression techniques. An very low bit rate image compression method based on region of interest(ROI) has beenproposed for deep space image. The conventional image compression algorithms which encode the original datawithout any data analysis can maintain very good details and haven' t high compression rate while the modernimage compressions with semantic organization can have high compression rate even to be hundred and can' tmaintain too much details. The algorithms based on region of interest inheriting from the two previews algorithmshave good semantic features and high fidelity, and is therefore suitable for applications at a low bit rate. Theproposed method extracts the region of interest by texture analysis after wavelet transform and gains optimal localquality with bit rate control. The Result shows that our method can maintain more details in ROI than generalimage compression algorithm(SPIHT) under the condition of sacrificing the quality of other uninterested areas.

关键词： wavelet compression ROI deep space

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Active Learning for Name Entity Recognition with External Knowledge

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ACM Transactions on Asian and Low-Resource Language Information Processing 1000年

作者： Ying Ma Yu Zhang Arun Kumar Sangaiah Ming Yan Guoqi Li Tian Wang Harbin Institute of Technology Xiamen University of Technology China Xiamen University of Technology China National Yunlin University of Science and Technology China Institute of High Performance Computing Agency for Science Technology and Research Singapore Institute of Automation China Academy of Sciences China BNU-UIC Institute of Artificial Intelligence and Future Networks Beijing Normal University Guangdong Key Lab of AI and Multi-Modal Data Processing BNU-HKBU United International College (UIC) China

Named Entity Recognition (NER) is an important task in knowledge extraction, which targets extracting structural information from unstructured text. To fully employ the prior-knowledge of the pre-trained language models, some research works formulate the NER task into the machine reading comprehension form (MRC-form) to enhance their model generalization capability of commonsense knowledge. However, this transformation still faces the data-hungry issue with limited training data for the specific NER tasks. To address the low-resource issue in NER, we introduce a method named active multi-task-based NER (AMT-NER), which is a two-stage multi-task active learning training model. Specifically, A multi-task learning module is first introduced into AMT-NER to improve its representation capability in low-resource NER tasks. Then, a two-stage training strategy is proposed to optimize AMT-NER multi-task learning. An associated task of Natural Language Inference (NLI) is also employed to enhance its commonsense knowledge further. More importantly, AMT-NER introduces an active learning module, uncertainty selective, to actively filter training data to help the NER model learn efficiently. Besides, we also find different external supportive data under different pipelines improves model performance differently in the NER tasks. Extensive experiments are performed to show the superiority of our method, which also proves our findings that the introduction of external knowledge is significant and effective in the MRC-form NER tasks.

关键词： Named Entity Recognition Machine Reading Comprehension Multi-task Learning Active Learning

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Edge-Adaptive Dynamic Scalable Convolution for Efficient Remote Mobile Pathology Analysis

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ACM Transactions on Autonomous and Adaptive Systems 1000年

作者： Peng Xiao Dajiang Chen Zhen Qin Mingsheng Cao Ruidong Chen Network and Data Security Key Laboratory of Sichuan Province University of Electronic Science and Technology of China China School of Computer Science & Engineering University of Electronic Science and Technology of China China

With the emergence of edge computing, there’s a growing need for advanced technologies capable of real-time, efficient processing of complex data on edge devices, particularly in mobile health systems handling pathological images. On edge computing devices, the lightweighting of models and reduction of computational requirements not only save resources but also increase inference speed. Although many lightweight models and methods have been proposed in recent years, they still face many common challenges. This paper introduces a novel convolution operation, Dynamic Scalable Convolution (DSC), which optimizes computational resources and accelerates inference on edge computing devices. DSC is shown to outperform traditional convolution methods in terms of parameter efficiency, computational speed, and overall performance, through comparative analyses in computer vision tasks like image classification and semantic segmentation. Experimental results demonstrate the significant potential of DSC in enhancing deep neural networks, particularly for edge computing applications in smart devices and remote healthcare, where it addresses the challenge of limited resources by reducing computational demands and improving inference speed. By integrating advanced convolution technology and edge computing applications, DSC offers a promising approach to support the rapidly developing mobile health field, especially in enhancing remote healthcare delivery through mobile multimedia communication.

关键词： Internet of things edge computing dynamic scalable convolution deep learning lightweight

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