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2014 International Conference on Information and Communications Technologies, ICT 2014

作者： Wu, Tao Zheng, Haixin Yan, Di Liu, Shaolin Science and Technology on Complex Electronic System Simulation Laboratory Academy of Equipment Beijing China Department of Optical and Electrical Equipment Academy of Equipment Beijing China Company of Postgraduate Management Academy of Equipment Beijing China School of Information and Communication Enginneering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781849198431

When the traditional SNR estimation algorithm based on singular value decomposition (SVD) is applied to the digital data analysis of spaceflight TT&C system, problem of large deviation arises. This paper analyzes the limitations of SVD, and proposes a modified singular value decomposition (MSVD) SNR estimation algorithm. Before estimating SNR by use of SVD, MSVD does some processing to whiten noise, such as band-pass, down-sampling, and up-sampling. The simulation results show that this algorithm can, within a large range, accurately estimate the actually received SNR, effectively improving the application scope of traditional algorithms.

关键词： Singular value decomposition

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Design and implementation of multiple volume servers block level storage system based on load-balanced strategy

International Journal of Database Theory and Application

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International Journal of Database Theory and Application 2014年第4期7卷 59-78页

作者： Wan, Jian Chen, Xun You, Xindong School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Key Laboratory of Complex System Modeling and Simulation Ministry of Education China

Block level storage system has been widely used as it can provide users raw block device. On the basis of Orthrus system, this paper designs and implements a multiple volume servers block level storage system based on load-balanced strategy-Orthrus Plus. This system uses the dynamic load-balanced strategy based on genetic algorithm strategy to load balance the volume servers clusters and proposes an iSCSI pause and resume method to solve the breakpoint retransmission problem during load-balancing. At last, we design a hierarchical management mechanism based on volume life cycle at storage. Experiments show that the load balancing capability in Orthrus Plus is more accurate and efficient under the situation of larger amount of data, and the hierarchical storage strategy also increases the I/O throughout capacity. © 2013 SERSC.

关键词： Genetic algorithms

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EXTP: Enhanced X-ray Timing and Polarization mission

EXTP: Enhanced X-ray Timing and Polarization mission

引用

space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray

作者： Zhang, S.N. Feroci, M. Santangelo, A. Dong, Y.W. Feng, H. Lu, F.J. Nandra, K. Wang, Z.S. Zhang, S. Bozzo, E. Brandt, S. De Rosa, A. Gou, L.J. Hernanz, M. Van Der Klis, M. Li, X.D. Liu, Y. Orleanski, P. Pareschi, G. Pohl, M. Poutanen, J. Qu, J.L. Schanne, S. Stella, L. Uttley, P. Watts, A. Xu, R.X. Yu, W.F. In't Zand, J.J.M. Zane, S. Alvarez, L. Amati, L. Baldini, L. Bambi, C. Basso, S. Bhattacharyya, S. Bellazzini, R. Belloni, T. Bellutti, P. Bianchi, S. Brez, A. Bursa, M. Burwitz, V. Budtz-Jorgensen, C. Caiazzo, I. Campana, R. Cao, X.L. Casella, P. Chen, C.Y. Chen, L. Chen, T.X. Chen, Y. Chen, Y. Chen, Y.P. Civitani, M. Zelati, F. Coti Cui, W. Cui, W.W. Dai, Z.G. Del Monte, E. De Martino, D. Di Cosimo, S. Diebold, S. Dovciak, M. Donnarumma, I. Doroshenko, V. Esposito, P. Evangelista, Y. Favre, Y. Friedrich, P. Fuschino, F. Galvez, J.L. Gao, Z.L. Ge, M.Y. Gevin, O. Goetz, D. Han, D.W. Heyl, J. Horak, J. Hu, W. Huang, F. Huang, Q.S. Hudec, R. Huppenkothen, D. Israel, G.L. Ingram, A. Karas, V. Karelin, D. Jenke, P.A. Ji, L. Kennedy, T. Korpela, S. Kunneriath, D. Labanti, C. Li, G. Li, X. Li, Z.S. Liang, E.W. Limousin, O. Lin, L. Ling, Z.X. Liu, H.B. Liu, H.W. Liu, Z. Lu, B. Lund, N. Lai, D. Luo, B. Luo, T. Ma, B. Mahmoodifar, S. Marisaldi, M. Martindale, A. Meidinger, N. Men, Y.P. Michalska, M. Mignani, R. Minuti, M. Motta, S. Muleri, F. Neilsen, J. Orlandini, M. Pan, A.T. Patruno, A. Perinati, E. Picciotto, A. Piemonte, C. Pinchera, M. Rachevski, A. Rapisarda, M. Rea, N. Rossi, E.M.R. Rubini, A. Sala, G. Shu, X.W. Sgro, C. Shen, Z.X. Soffitta, P. Song, L.M. Spandre, G. Stratta, G. Strohmayer, T.E. Sun, L. Svoboda, J. Tagliaferri, G. Tenzer, C. Tong, H. Taverna, R. Torok, G. Turolla, R. Vacchi, A. Wang, J. Wang, J.X. Walton, D. Wang, K. Wang, J.F. Wang, R.J. Wang, Y.F. Weng, S.S. Wilms, J. Winter, B. Wu, X. Wu, X.F. Xiong, S.L. Xu, Y.P. Xue, Y.Q. Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sc iences Beijing100049 China IAPS INAF Via del Fosso del Cavaliere 100 Rome00133 Italy IAAT University of Tuebingen Sand 1 Tuebingen72076 Germany ISDC Geneve University Chemin d'Ecogia 16 Versoix1290 Switzerland National Space Institute Technical University of Denmark Elektrovej Bld 327 Kgs Lyngby2800 Denmark Campus UAB C/Magrans s/n Barcelona Spain DPNC Geneve University Quai Ernest-Ansermet 30 Geneva1205 Switzerland Astrophysics Science Division Joint Space-Science Institute NASA Goddard Space Flight Center GreenbeltMD20771 United States Department of Engineering Physics Center for Astrophysics Tsinghua University Beijing100084 China Key Laboratory of Advanced Microstructured Materials Ministry of Education Institute of Precision Optical Engineering School of Physics Science and Engineering Tongji University Shanghai200090 China National Astronomical Observatories Chinese Academy of Sciences 20A Datun Road Chaoyang District Beijing China Shanghai Astronomical Observatory 80 Nandan Road Shanghai200030 China Nanjing University 22 Hankou Road Nanjing Jiangsu210093 China Purdue University 525 Northwestern Avenue West LafayetteIN47907 United States Max Planck Institute for extraterrestrial Physics Giessenbachstr. 1 Garching Germany Peking University No.5 Yiheyuan Road Haidian District Beijing100871 China Center for Field Theory and Particle Physics Department of Physics Fudan University Shanghai200433 China University of Alabama in Huntsville HuntsvilleAL35805 United States INAF OA Roma Via Frascati 33 Monte Porzio Catone00040 Italy Anton Pannekoek Institute University of Amsterdam Postbus 94249 Amsterdam Netherlands SRON Sorbonnelaan 2 Utrecht3584 CA Netherlands Leiden Observatory Niels Bohrweg 2 LeidenNL-2333 CA Netherlands ASTRON Netherlands Institute for Radio Astronomy Postbus 2 Dwingeloo7990 AA Netherlands 2

ISBN: (纸本)9781510601895

EXTP is a science mission designed to study the state of matter under extreme conditions of density, gravity and magnetism. Primary goals are the determination of the equation of state of matter at supra-nuclear density, the measurement of QED effects in highly magnetized star, and the study of accretion in the strong-field regime of gravity. Primary targets include isolated and binary neutron stars, strong magnetic field systems like magnetars, and stellar-mass and supermassive black holes. The mission carries a unique and unprecedented suite of state-of-the-art scientific instruments enabling for the first time ever the simultaneous spectral-timing-polarimetry studies of cosmic sources in the energy range from 0.5-30 keV (and beyond). Key elements of the payload are: the Spectroscopic Focusing Array (SFA) - a set of 11 X-ray optics for a total effective area of ∼0.9 m2 and 0.6 m2 at 2 keV and 6 keV respectively, equipped with Silicon Drift Detectors offering 2, between 6 and 10 keV, and spectral resolution better than 250 eV;the Polarimetry Focusing Array (PFA) - a set of 2 X-ray telescope, for a total effective area of 250 cm2 at 2 keV, equipped with imaging gas pixel photoelectric polarimeters;the Wide Field Monitor (WFM) - a set of 3 coded mask wide field units, equipped with position-sensitive Silicon Drift Detectors, each covering a 90 degrees × 90 degrees field of view. The eXTP international consortium includes major institutions of the Chinese Academy of sciences and Universities in China, as well as major institutions in several European countries and the United States. The predecessor of eXTP, the XTP mission concept, has been selected and funded as one of the so-called background missions in the Strategic Priority space science Program of the Chinese Academy of sciences since 2011. The strong European participation has significantly enhanced the scientific capabilities of eXTP. The planned launch date of the mission is earlier than 2025. © 2016 SPIE.

关键词： Polarimeters

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The freeform collimating lens designed for light transmission

The freeform collimating lens designed for light transmissio...

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International Conference on Advanced Robotics and Intelligent systems (ARIS)

作者： A. J. W. Whang K. C. Jhan C. C. Su J. W. Chen Photonics System Simulation and Design Laboratory National Taiwan University of Science and Technology Taipei Taiwan Department of Electro-Optical Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Electronic Engineering National Taiwan University of Science and Technology Taipei Taiwan

This paper explores the design of a collimating lens based on freeform method. With this freeform structure, the light can be propagated as nearly parallel light which allow the light be transmitted to a large distanc... 详细信息

关键词： Lenses Lighting Vectors Educational institutions Laboratories Renewable energy sources Optical fibers

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Ontology-based heterogeneous data integration technology

Ontology-based heterogeneous data integration technology

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2013 International Conference on Vehicle and Mechanical Engineering and Information technology, VMEIT 2013

作者： Li, Kang Li, Xin Ming Liu, Dong Cui, Yun Fei Science and Technology on Complex Electronic System Simulation Laboratory China

ISBN: (纸本)9783037858202

For the vast amounts of heterogeneous data is difficult to effectively deal with the problem, propose an ontology-based data integration technology. Analysis of the types of semantic conflicts in data integration, ontology semantic description of traditional data integration framework for data integration middleware module. Ontology concept in the domain of information resources, and take the initiative to find and build semantic mapping between semantic conflicts. © (2013) Trans Tech Publications, Switzerland.

关键词： Data integration

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A latency-hiding scheme for adjacent interaction simulation on multi-core/many-core clusters

A latency-hiding scheme for adjacent interaction simulation ...

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13th International Conference on systems simulation, AsiaSim 2013

作者： Chen, Li-Li Li, Wei Zhang, Jing Shi, Shuai Huang, Jian-Xin Science and Technology on Complex System Simulation Laboratory Beijing China

ISBN: (纸本)9783642450365

As the processor has entered the multi-core/many-core era, the parallel processing capability of a single processor can be improved in scale with increasing cores. However, for the high performance computation (HPC) clusters, the improvement of inter-node communication latency is far behind of the performance improvement of processors. As a result, communication latency often becomes the performance bottleneck of most HPC applications. This paper focuses on solving the communication latency problem of adjacent inter-action simulation on multi-core/many-core clusters, and pro-poses an optimized algorithm for adjacent interaction simula-tion on modern general purpose graphic many-core architec-tures and an O(B+2R) algorithm for inter-node latency- hiding. The theoretical analysis and experimental result show that the techniques proposed in this paper can effectively improve the performance of adjacent interaction simulation on multi-core/many-core clusters. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Parallel processing systems

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A massive grid-connected power accumulator battery testing system using hybrid AC-DC microgrid

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2014年 29卷 449-453页

作者： Long, Bo Sun, Hongbin Wang, Bin Yao, Shuqing Fang, Xu Yao, Gaoxiang University of Electronic Science and Technology Chengdu610054 China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing100084 China Bohai New Century Machinery Manufacturing Co. Ltd. TianJin300280 China

Nowadays, the network mode of the most energy recovery power battery testing instruments adopts AC-microgrid, which has the drawbacks of low energy recovery efficiency, complicated power circuit topology, cumbersome of the control algorithms. Aiming at these issues, a hybrid AC-DC microgrid system which is based on the power battery testing system has been put forward in this paper. The proposed scheme is composed by an energy storing system, a bidirectional DC-DC converter for test experiment, the grid-side loads, compared with conventional scheme, the proposed scheme has the merits of higher energy recovery efficiency, simplified power circuit for testing instruments. ©, 2014, Diangong Jishu Xuebao/Transactions of China Electrotechnical Society. All right reserved.

关键词： DC-DC converters

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The first post-Kepler brightness dips of KIC 8462852

arXiv

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arXiv 2018年

作者： Boyajian, Tabetha S. Alonso, Roi Ammerman, Alex Armstrong, David Ramos, A. Asensio Barkaoui, K. Beatty, Thomas G. Benkhaldoun, Z. Benni, Paul Bentley, Rory Berdyugin, Andrei Berdyugina, Svetlana Bergeron, Serge Bieryla, Allyson Blain, Michaela G. Blanco, Alicia Capetillo Bodman, Eva H. L. Boucher, Anne Bradley, Mark Brincat, Stephen M. Brink, Thomas G. Briol, John Brown, David J. A. Budaj, J. Burdanov, A. Cale, B. Carbo, Miguel Aznar García, R. Castillo Clark, Wendy J. Clayton, Geoffrey C. Clem, James L. Coker, Phillip H. Cook, Evan M. Copperwheat, Chris M. Curtis, J. Cutri, R.M. Cseh, B. Cynamon, C.H. Daniels, Alex J. Davenport, James R. A. Deeg, Hans J. De Lorenzo, Roberto Jaeger, Thomas De Desrosiers, Jean-Bruno Dolan, John Dowhos, D.J. Dubois, Franky Durkee, R. Dvorak, Shawn Easley, Lynn Edwards, N. Ellis, Tyler G. Erdelyi, Emery Ertel, Steve Farfán, RafaeL. G. Farihi, J. Filippenko, Alexei V. Foxell, Emma Gandolfi, Davide Garcia, Faustino Giddens, F. Gillon, M. González-Carballo, Juan-Luis González-Fernández, C. Hernández, J. I. González Graham, Keith A. Greene, Kenton A. Gregorio, J. Hallakoun, Na'ama Hanyecz, Ottó Harp, G.R. Henry, Gregory W. Herrero, E. Hildbold, Caleb F. Hinzel, D. Holgado, G. Ignácz, Bernadett Ivanov, Valentin D. Jehin, E. Jermak, Helen E. Johnston, Steve Kafka, S. Kalup, Csilla Kardasis, Emmanuel Kaspi, Shai Kennedy, Grant M. Kiefer, F. Kielty, C.L. Kessler, Dennis Kiiskinen, H. Killestein, T.L. King, Ronald A. Kollar, V. Korhonen, H. Kotnik, C. Könyves-Tóth, Réka Kriskovics, Levente Krumm, Nathan Krushinsky, Vadim Kundra, E. Lachapelle, Francois-Rene Lacourse, D. Lake, P. Lam, Kristine Lamb, Gavin P. Lane, Dave Lau, Marie Wingyee Lewin, Pablo Lintott, Chris Lisse, Carey Logie, Ludwig Longeard, Nicolas Villanueva, M. Lopez Ludington, E. Whit Mainzer, A. Malo, Lison Maloney, Chris Mann, A. Mantero, A. Marengo, Massimo Marchant, Jon González, M. J. Martínez Masiero, Joseph R. Mauerhan, Jon C. McCormac, James McNeely, Aaron Meng, Huan Y. A. Miller, Mike Molnar, Lawrence A. Morales, J.C. M Department of Physics and Astronomy Louisiana State University Baton RougeLA70803 United States Instituto de Astrofísica de Canarias La Laguna Tenerife38205 Spain Departamento de Astrofísica Universidad de La Laguna La Laguna Tenerife38206 Spain American Association of Variable Star Observers University of Notre Dame QuarkNet Center Department of Physics University of Warwick Gibbet Hill Road CoventryCV4 7AL United Kingdom Centre for Exoplanets and Habitability University of Warwick Gibbet Hill Road CoventryCV4 7AL United Kingdom Institute of Astronomy University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom Institute Université de Liège Belgium Laboratoire LPHEA Oukaimeden Observatory Cadi Ayyad University/FSSM BP 2390 Marrakesh Morocco Department of Astronomy & Astrophysics Pennsylvania State University 525 Davey Lab University ParkPA16802 United States Center for Exoplanets and Habitable Worlds Pennsylvania State University 525 Davey Lab University ParkPA16802 United States Acton Sky Portal ActonMA01720 United States Tuorla Observatory University of Turku Finland Kiepenheuer Institut für Sonnenphysik Freiburg Germany Royal Astronomical Society of Canada Harvard-Smithsonian Center for Astrophysics 60 Garden St CambridgeMA02138 United States Department of Physics and Astronomy Calvin College Grand RapidsMI49546 United States American Association of Variable Star Observer School of Earth and Space Exploration Arizona State University TempeAZ85287-1404 United States Nexus for Exoplanet System Science Institute for Research on Exoplanets Département de Physique Université de Montréal MontréalQCH3C 3J7 Canada Department of Astronomy University of California BerkeleyCA94720-3411 United States Astronomical Institute Slovak Academy of Sciences Slovakia George Mason University MSN 3F3 4400 University Drive FairfaxVA22030 United States American Association of Variable Star Observers Blesa Spain Asociación Astronómic

We present a photometric detection of the first brightness dips of the unique variable star KIC 8462852 since the end of the Kepler space mission in 2013 May. Our regular photometric surveillance started in October 2015, and a sequence of dipping began in 2017 May continuing on through the end of 2017, when the star was no longer visible from Earth. We distinguish four main 1-2.5% dips, named "Elsie," "Celeste," "Skara Brae," and "Angkor", which persist on timescales from several days to weeks. Our main results so far are: (i) there are no apparent changes of the stellar spectrum or polarization during the dips;(ii) the multiband photometry of the dips shows differential reddening favoring non-grey extinction. Therefore, our data are inconsistent with dip models that invoke optically thick material, but rather they are in-line with predictions for an occulter consisting primarily of ordinary dust, where much of the material must be optically thin with a size scale ◂ 1μm, and may also be consistent with models invoking variations intrinsic to the stellar photosphere. Notably, our data do not place constraints on the color of the longer-term "secular" dimming, which may be caused by independent processes, or probe different regimes of a single process. Copyright © 2018, The Authors. All rights reserved.

关键词： Luminance

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Research and implementation of distributed disaster recovery system based on PRS algorithm

International Journal of Database Theory and Application

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International Journal of Database Theory and Application 2014年第3期7卷 91-106页

作者： Wan, Jian Xuan, Huijia Zhang, Jilin School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Key Laboratory of Complex System Modeling and Simulation Ministry of Education Hangzhou China Electric Engineering School Zhejiang University Hangzhou China

With the advent of the information age, the data volumes of various industries are in explosive growth, which increasingly highlights the importance of data. When a disaster occurs, how to recover the data completely and rapidly is one of the important issues receiving common concerns throughout the current industrial and academic circles. Based on the traditional disaster recovery system, this paper researches and implements a PRS algorithm-based distributed disaster recovery system[1, 2] called OsnDDR, which ensures the high availability of the system under the circumstance of continuous disasters or multi-node damage. The system adopts PRS algorithm based on RS erasure code [3] to reduce the storage resource consumption caused by the data redundancy and designs the load balancing strategy to guarantee the load balancing of each disaster recovery center in the system. © 2014 SERSC.

关键词： Disasters

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Planetary science: Lunar impact basins revealed by gravity recovery and interior laboratory measurements

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science Advances 2015年第9期1卷

作者： Neumann, Gregory A. Zuber, Maria T. Wieczorek, Mark A. Head, James W. Baker, David M. H. Solomon, Sean C. Smith, David E. Lemoine, Frank G. Mazarico, Erwan Sabaka, Terence J. Goossens, Sander J. Melosh, H. Jay Phillips, Roger J. Asmar, Sami W. Konopliv, Alexander S. Williams, James G. Sori, Michael M. Soderblom, Jason M. Miljkovic, Katarina Andrews-Hanna, Jeffrey C. Nimmo, Francis Kiefer, Walter S. Solar System Exploration Division NASA Goddard Space Flight Center GreenbeltMD20771 United States Department of Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology CambridgeMA02139 United States Institut de Physique du Globe de Paris Sorbonne Paris Cité Université Paris Diderot CNRS Paris75013 France Department of Earth Environmental and Planetary Sciences Brown University ProvidenceRI02912 United States Lamont-Doherty Earth Observatory Columbia University PalisadesNY10964 United States Department of Terrestrial Magnetism Carnegie Institution of Washington WashingtonDC20015 United States Center for Research and Exploration in Space Science and Technology University of Maryland BaltimoreMD21250 United States Department of Earth Department of Atmospheric and Planetary Sciences Purdue University West LafayetteIN47907 United States Planetary Science Direct. Southwest Research Institute BoulderCO80302 United States Jet Propulsion Laboratory California Institute of Technology PasadenaCA91109-8099 United States Department of Geophysics Center for Space Resources Colorado School of Mines GoldenCO80401 United States Department of Earth and Planetary Sciences University of California Santa CruzCA95064 United States Lunar and Planetary Institute HoustonTX77058 United States

Observations from the Gravity Recovery and Interior laboratory (GRAIL) mission indicate a marked change in the gravitational signature of lunar impact structures at the morphological transition, with increasing diameter, from complex craters to peak-ring basins. At crater diameters larger than ~200 km, a central positive Bouguer anomaly is seen within the innermost peak ring, and an annular negative Bouguer anomaly extends outward from this ring to the outer topographic rim crest. These observations demonstrate that basin-forming impacts remove crustal materials from within the peak ring and thicken the crust between the peak ring and the outer rim crest. A correlation between the diameter of the central Bouguer gravity high and the outer topographic ring diameter for well-preserved basins enables the identification and characterization of basins for which topographic signatures have been obscured by superposed cratering and volcanism. The GRAIL inventory of lunar basins improves upon earlier lists that differed in their totals by more than a factor of 2. The size-frequency distributions of basins on the nearside and farside hemispheres of the Moon differ substantially;the nearside hosts more basins larger than 350 km in diameter, whereas the farside has more smaller basins. Hemispherical differences in target properties, including temperature and porosity, are likely to have contributed to these different distributions. Better understanding of the factors that control basin size will help to constrain models of the original impactor population. © 2015 The Authors, some rights reserved.

关键词： Moon

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