检索结果-内蒙古大学图书馆

Design of Acquisition and Controlling system for Multi-channel Digital-analog Signal Based on FPGA

Design of Acquisition and Controlling System for Multi-chann...

2011 IEEE 3rd International Conference on Communication Software and Networks(2011第三届通信软件与网络国际会议 ICCSN2011)

作者： Liu Wei Zhang Yanjun Hong Yingping Jiang Wei National Key Laboratory for Electronic Measurement Technology North University of China Taiyuan C Project Research Institution of Space Navigation System in Beijing Beijing China

Acquisition Device is the core of this system. Acquisition module is controlled by the Ground monitoring device, which is responsible for collecting 48 routes analog signal with different sampling rate, receiving digital signals transported by RS-422 (1 route), and transmitting acquired analog and digital signals to ground monitoring device for real-time monitoring. At the same time, after mixing and compiling frame, Acquisition module sends signals to the storage module in parallel way. The collected signals are analyzed by means of the date which is read out of the storage module. This acquisition and controlling system has been applied in the check of flight test in one flight vehicle.

关键词： RS-422 interface digital-analog signal multichannel parallel way acquisition and controlling.

来源：评论

学校读者我要写书评

暂无评论

Development of the onboard processor for Pi-SAR2

Development of the onboard processor for Pi-SAR2

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Jyunpei Uemoto Seiho Uratsuka Toshihiko Umehara Shin-ichi Yamamoto Shinichi Taira Makoto Satake Shoichiro Kojima Tatsuharu Kobayashi Masaki Satoh Kazuyoshi Kawasaki Takeshi Matsuoka Akitsugu Nadai Ryutaro Suzuki Radiowave Remote Sensing Laboratory Applied Electromagnetic Research Institute Institute of Information and Communications Technology Tokyo Japan Space Communication Systems Laboratory Wireless Network Research Institute National Institute of Information and Communications Technology (NICT) Tokyo Japan Strategic Planning Department (NICT) National Institute of Information and Communications Technology Tokyo Japan Integrated Science Data System Research Laboratory National Institute of Information and Communications Technology (NICT) Tokyo Japan

The synthetic aperture radar (SAR) has been utilized for monitoring natural disaster areas because the SAR observation can be performed irrespective of the daylight and weather conditions. To reduce the time from observation to distributing SAR images to the headquarters for disaster control and disaster area, we have developed an onboard processor which is capable of doing a full-spec processing for the airborne SAR called as the polarimetric and interferometric SAR (Pi-SAR2) since 2009. We demonstrated that the developed onboard processor is effective to reduce the time from observation to distribution and the SAR image can be transferred to the ground within 15 min after observation via the communication satellite called as the engineering test satellite VIII (ETS-VIII) in the experiments on March 2011.

关键词： Image processing Synthetic aperture radar Satellite communication Laboratories Head Process control

来源：评论

学校读者我要写书评

暂无评论

Efficient Distributed Skyline Queries for Mobile Applications

引用

计算机科学技术学报（英文版） 2010年第3期25卷 523-536页

作者： Ying-Yuan Xiao Yue-Guo Chen Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191China Key Laboratory of Computer Vision and System Tianjin University of TechnologyTianjin 300191China School of Computing National University of Singapore117417Singapore Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of ChinaBeijing 100872China

In this paper,we consider skyline queries in a mobile and distributed environment,where data objects are distributed in some sites(database servers)which are interconnected through a high-speed wired network,and queries are issued by mobile units(laptop,cell phone,etc.)which access the data objects of database servers by wireless *** inherent properties of mobile computing environment such as mobility,limited wireless bandwidth,frequent disconnection,make skyline queries more *** show how to efficiently perform distributed skyline queries in a mobile environment and propose a skyline query processing approach,called efficient distributed skyline based on mobile computing(EDS-MC).In EDS-MC,a distributed skyline query is decomposed into five processing phases and each phase is elaborately designed in order to reduce the network communication,network delay and query response *** conduct extensive experiments in a simulated mobile database system,and the experimental results demonstrate the superiority of EDS-MC over other skyline query processing techniques on mobile computing.

关键词： skyline distributed query processing mobile database system

来源：评论

学校读者我要写书评

暂无评论

Cache blocks: An efficient scheme for solid state drives without DRAM cache

Cache blocks: An efficient scheme for solid state drives wit...

引用

IEEE International Conference on Networking, Architecture and Storage

作者： Wu, Fei Chen, Xiang Wan, Jiguang Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China Division of Data Storage System Wuhan National Laboratory for Optoelectronics China

ISBN: (纸本)9780769541341

Most solid state drives use DRAM for device's cache, the volatile memory provides the I/O Caching ability, and maintains the drives' mapping table (indicates the correspondence between physical unit and logical unit). However, when the drives' power shut down unexpected, the volatile DRAM memory may lose the caching data, which did not have time to write to the drives' storage media, so the dirty data generated. This paper proposes an efficient management scheme for low cost Solid State Drives, with low cost ASIC controller chip, only has internal SRAM memory, and no external DRAM. We use a kind of Cache Blocks: when write requests come, write in these areas first, and write in the sequentially physical place, and the limited internal SRAM for the mapping tables maintaining and data transferring. We propose some efficient methods: 1)using flash memory as cache, 2) page mapping for cache blocks regions, block mapping for data blocks regions, 3) binding two planes operation, 4) using the idle internal plane SRAM as data buffer to improve the I/O performance, without DRAM. So we avoid the dirty data when the power loses unexpected. And this scheme is energy-efficient and low cost. We test the scheme on our own SSD test board, with the pool SRAM size, the I/O performances do not decrease two much, and the random write even better about 20%, compare to the SSD with DRAM. The experiment also shows, this scheme cuts about 21% energy than the DRAM architecture. And it may be adapted in consumer electronics area. © 2010 IEEE.

关键词： Dynamic random access storage

来源：评论

学校读者我要写书评

暂无评论

Erratum: Continental-scale temperature variability during the past two millennia

引用

Nature Geoscience 2013年第6期6卷 503页

作者： Moinuddin Ahmed Kevin J. Anchukaitis Brendan M. Buckley Edward R. Cook Jason E. Smerdon Asfawossen Asrat Mohammed Umer Hemant P. Borgaonkar Martina Braida Barbara Stenni Ulf Büntgen Raphael Neukom Brian M. Chase Duncan A. Christie Antonio Lara Mark A. J. Curran Andrew D. Moy Tas van Ommen Henry F. Diaz Jan Esper Ze-Xin Fan Narayan P. Gaire Quansheng Ge Xuemei Shao Joëlle Gergis J Fidel González-Rouco Hugues Goosse Stefan W. Grab David J. Nash Nicholas Graham Rochelle Graham Martin Grosjean Heinz Wanner Sami T. Hanhijärvi Atte A. Korhola Darrell S. Kaufman Nicholas P. McKay Thorsten Kiefer Lucien von Gunten Katsuhiko Kimura Paul J. Krusic Anne-Marie Lézine Fredrik C. Ljungqvist Andrew M. Lorrey Jürg Luterbacher Johannes P. Werner Valérie Masson-Delmotte Danny McCarroll Maria R. Prieto Joseph R. McConnell Michael Sigl Mariano S. Morales Ignacio A. Mundo Ricardo Villalba Robert Mulvaney Takeshi Nakatsuka Masaki Sano Sharon E. Nicholson Hans Oerter Jonathan G. Palmer Steven J. Phipps Chris S.M. Turney Andres Rivera Mirko Severi Timothy M. Shanahan Feng Shi Olga N. Solomina Eric J. Steig Meloth Thamban Valerie Trouet Dirk Verschuren Andre E. Viau Bo M. Vinther Sebastian Wagner Eduardo Zorita Eugene R. Wahl James W.C. White Koh Yasue Department of Botany Federal Urdu University of Arts Science and Technology Karachi 75300 Pakistan Lamont Doherty Earth Observatory Columbia University Palisades 10964 New York USA Woods Hole Oceanographic Institution Woods Hole 2543 Massachusetts USA School of Earth Sciences Addis Ababa University Addis Ababa Ethiopia Indian Institute of Tropical Meteorology Pune 411008 India Dipartimento di Matematica e Geoscienze University of Trieste 34128 Italy Swiss Federal Research Institute WSL Birmensdorf 8903 Switzerland Département Paléoenvironnements et Paléoclimats (PAL) Université Montpellier Montpellier 34095 France Department of Archaeology History Cultural Studies and Religion University of Bergen Bergen 5020 Norway Laboratorio de Dendrocronología y Cambio Global Universidad Austral de Chile Casilla 567 Valdivia Chile Center for Climate and Resilience Research Universidad de Chile Casilla 2777 Santiago Chile Australian Antarctic Division Kingston 7050 Tasmania Australia Antarctic Climate & Ecosystems Cooperative Research Centre University of Tasmania Sandy Bay 7005 Tasmania Australia Cooperative Institute for Research in Environmental Sciences National Oceanic and Atmospheric Administration Boulder 80305 Colorado USA Department of Geography Johannes Gutenberg University Mainz 55099 Germany Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Yunnan 666303 China Faculty of Science Nepal Academy of Science and Technology Khumaltar GPO Box 3323 Lalitpur Nepal Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China School of Earth Sciences University of Melbourne Melbourne 3010 Victoria Australia Departamento Astrofísica y CC de la Atmósfera Universidad Complutense de Madrid Madrid 28040 Spain Lemaitre Center for Earth and Climate Research Earth and Life Institute Université catholique de Louvain Louvain-la-Neuve 1348 Belgium School of Geography Archaeolog

来源：评论

学校读者我要写书评

暂无评论

Effcient Distributed Skyline Queries for Mobile Applications

引用

Journal of Computer Science & technology 2010年第3期25卷 523-536页

作者：肖迎元陈跃国 Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology Key Laboratory of Computer Vision and System Tianjin University of Technology School of Computing National University of Singapore Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of China

In this paper, we consider skyline queries in a mobile and distributed environment, where data objects are distributed in some sites （database servers） which are interconnected through a high-speed wired network, and queries are issued by mobile units （laptop, cell phone, etc.） which access the data objects of database servers by wireless channels. The inherent properties of mobile computing environment such as mobility, limited wireless bandwidth, frequent disconnection, make skyline queries more complicated. We show how to efficiently perform distributed skyline queries in a mobile environment and propose a skyline query processing approach, called efficient distributed skyline based on mobile computing （EDS-MC）. In EDS-MC, a distributed skyline query is decomposed into five processing phases and each phase is elaborately designed in order to reduce the network communication, network delay and query response time. We conduct extensive experiments in a simulated mobile database system, and the experimental results demonstrate the superiority of EDS-MC over other skyline query processing techniques on mobile computing.

关键词： skyline distributed query processing mobile database system

来源：评论

学校读者我要写书评

暂无评论

Cache Blocks: An Efficient Scheme for Solid State Drives without DRAM Cache

Cache Blocks: An Efficient Scheme for Solid State Drives wit...

引用

International Conference on Networking, Architecture, and Storage (NAS)

作者： Fei Wu Xiang Chen Jiguang Wan Key Laboratory of Data Storage System School of Computer Science and Technology Division of Data Storage System Wuhan National Laboratory of Optoelectronics Huazhong University of Science and Technology Wuhan Hubei China

关键词： Random access memory Microprogramming Flash memory Solids Arrays Capacitance Accidents

来源：评论

学校读者我要写书评

暂无评论

A Low Cost and Inner-round Pipelined Design of ECB-AES-256 Crypto Engine for Solid State Disk

A Low Cost and Inner-round Pipelined Design of ECB-AES-256 C...

引用

International Conference on Networking, Architecture, and Storage (NAS)

作者： Fei Wu Liang Wang Jiguang Wan Key Laboratory of Data Storage System School of Computer Science and Technology Division of Data Storage System Wuhan National Laboratory of Optoelectronics Huazhong University of Science and Technology Wuhan Hubei China

Solid-State Disks (SSD) are widely used in government and security departments owing to its faster speed of data access, more durability, more shock and drop, no noise, lower power consumption, lighter weight compared with Magnetic disk. As a result, the demand of security for storing data has been generated. The Advanced Encryption Standard (AES) is today's key data encryption standard for protecting data, but the implementation of high-speed AES encryption engine needs to consume a large number of hardware resources. This paper presents a low-cost and inner-round pipelined ECB-256-AES encryption engine. Through sharing the resources between the AES encryption module and the AES decryption module and using the look-up table for the SubBytes and InvSubBytes operations, the logic resources have been largely reduced; by using loop rolling and inner-round pipelined techniques, a high throughput of encryption and decryption operations is achieved. A 1.986Gbits/s throughput and 232.748MHz clock frequency are achieved using 614 slices of the Xilinx xc6slx45-3fgg484. The simulation results show that the AES crypto design is able to meet the read and write speed of SATA 1.0 interface.

关键词： Encryption Engines Table lookup Random access memory Registers Pipelines

来源：评论

学校读者我要写书评

暂无评论

Study in retrieval visibility and optical thickness of fog with MODTRAN

Study in retrieval visibility and optical thickness of fog w...

引用

International Conference on Multimedia technology

作者： Zhang, Wengang Wei, Ming Yu, Tao Wang, Gengke Lai, Jibao Wang, Yuqing Key Laboratory of Meteorological Disaster of Ministry of Education Earth System Remote Sensing Institute Nanjing University of Information Science and Technology Nanjing 210044 China Center for National Space-borne Demonstration Beijing 100101 China Institute of Data and Knowledge Engineering Henan University Kaifeng Henan 475001 China Binjiang College Nanjing University of Information Science and Technology Nanjing 210044 China

ISBN: (纸本)9781424478743

In recent years, many scientists have done some work in monitoring the fog, and achieved fruitful results. Now we want to conduct more in-depth study. In this paper, we utilize MODTRAN to simulate the relationship between transmittance and visibility, height of fog. By fitting the relationship between them, we get the formula that calculates visibility of fog using transmittance and height of fog. The correlation coefficient of this formula is very high, so it can be regarded as an accuracy one. The height of fog can be calculated by top temperature of fog, surface temperature and vertical lapse rate. The transmittance of the fog can be measured by using special instrument. Therefore, the visibility and optical thickness can be retrieved by this method. ©2010 IEEE.

关键词： Visibility

来源：评论

学校读者我要写书评

暂无评论

I/O Response Rate Analysis in the Replicate-Based Object Storage system

I/O Response Rate Analysis in the Replicate-Based Object Sto...

引用

International Symposium on Distributed Computing and Applications to Business, Engineering and Science (DCABES)

作者： Zhipeng Tan Yulai Xie Quanli Gui Tian Zhan Wenhua Zhang Key Laboratory of Data Storage System Ministry of Education Wuhan National Laboratory of Optoelectronics School of Computer Science Huazhong University of Science and Technology Wuhan China

With the development of storage technology, storage system capacity has been rapidly growing, so rapid that storage I/O performance has become one of the most critical issues in large complex systems. This article combines the latest research in object-based storage with replica technology to share I/O in the object storage system, and to maintain high and stable I/O response rate. Theoretical derivation and simulation experiment results are both examined, which show the prominent role that replicas can play in improving system performance and maintain stable I/O response rate.

关键词： Time factors Throughput Bibliographies Laboratories Stability analysis Mathematical model File systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：