Plant Ecology / William Leach

• Record Nr.: UNINA990001459750403321
• Autore: Leach, William
• Pubbl/distr/stampa: London, : Methuen & Co. LTD, c1963
• Edizione: [4 edz]
• Descrizione fisica: vii, 106 p. ; 15 cm
• Locazione: SC1
• Collocazione: BSF-581.5-LEA-1
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia

Assessing the socioeconomic impact and value of open geospatial information : a workshop / / organized by the National Aeronautics and Space Administration, the U.S. Geological Survey, the University of Colorado, Boulder, and the George Washington University, Elliott School of International Affairs ; by Francoise Pearlman [and eleven others] ; prepared in cooperation with the Socioeconomic Benefits Community

• Record Nr.: UNINA9910707389203321
• Pubbl/distr/stampa: Reston, Virginia : , : U.S. Department of the Interior, U.S. Geological Survey, , 2016
• Descrizione fisica: 1 online resource (vi, 36 pages) : illustrations (some color)
• Collana: Open-file report ; ; 2016-1036
• Soggetti: Geospatial data - Economic aspects; Geospatial data - Social aspects; Value - Evaluation; Open access publishing; Information commons; Big data; Conference papers and proceedings.
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Title from title screen (viewed on July 8, 2016).; "This report summarizes discussion at the Workshop on Assessing the Impact and Value of Open Geospatial Information held at George Washington University in Washington, D.C. in October 2014"--Page 3.; "Prepared in cooperation with the Socioeconomic Benefits Community."
• Nota di bibliografia: Includes bibliographical references (pages 21-22).

Wireless and Satellite Systems : 12th EAI International Conference, WiSATS 2021, Virtual Event, China, July 31 – August 2, 2021, Proceedings / / edited by Qing Guo, Weixiao Meng, Min Jia, Xue Wang

• Record Nr.: UNINA9910523721603321
• Pubbl/distr/stampa: Cham : , : Springer International Publishing : , : Imprint : Springer, , 2022
• ISBN: 3-030-93398-9
• Edizione: [1st ed. 2022.]
• Descrizione fisica: 1 online resource (841 pages)
• Collana: Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, , 1867-822X ; ; 410
• Disciplina: 621.384; 621.382
• Soggetti: Computer networks; Data structures (Computer science); Information theory; Application software; Computer science - Mathematics; Mathematical statistics; Computer systems; Computer Communication Networks; Data Structures and Information Theory; Computer and Information Systems Applications; Probability and Statistics in Computer Science; Computer System Implementation
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Nota di contenuto: Intro -- Preface -- Organization -- Contents -- Satellite Network Transmission -- Inter Satellite Link Interference Detection and Analysis of NGSO Satellite System -- Abstract -- 1 Introduction -- 1.1 Development of NGSO Constellation Status of NGSO Constellation -- 1.2 Research of Interference Analysis for NGSO Constellation -- 2 Construction of Inter Satellite Link Interference Model -- 2.1 NGSO Constellation Construction -- 2.2 System Model -- 2.3 Analysis of Interference Problem -- 3 Simulation Setup133 -- 4 Conclusion -- References -- A Fast Acquisition Algorithm Based on High Sampling Rate FFT for LEO Satellite Signals -- Abstract -- 1 Introduction -- 2 Principle -- 3 Simulation -- References -- Satellite Staring Beam Scheduling Strategy Based on Multi-agent Reinforcement Learning -- 1 Introduction -- 2 System Model -- 3 Multi-agent Deep Q-Learning Algorithm -- 4 Simulation Results -- 5 Conclusion -- References -- Optimization of Joint Power and Bandwidth Allocation for Multiple Users in a Multi-spot-Beam Satellite Communication -- Abstract -- 1 Introduction -- 2 System Model -- 2.1 Downlink Capacity of Users -- 2.2 Optimization Problem Formulation -- 3 Proposed Joint Bandwidth and Power Allocation Algorithm -- 3.1 Optimal Allocation Algorithm -- 3.2 Low Computational Complexity Allocation Algorithm -- 4 Performance Analysis and Simulation Results -- 4.1 Efficiency of the Proposed Joint Allocation Algorithm -- 4.2 Performance of the Low Computational Complexity Allocation Algorithm -- 4.3 The Impact of Pre-allocations for Each Beam -- 5 Conclusion -- Appendix -- References -- A Networking Transmission Method in the Case of Limited Satellite Transceiver -- Abstract -- 1 Introduction -- 2 Topology Planning Based on Fairness -- 3 Low Delay Routing Method Based on Step-by-Step Strategy -- 4 Performance Evaluation and Simulations -- 5 Conclusion.; Acknowledgments -- References -- Design and Implementation of a High Efficiency Space Packet Routing Algorithm on a Spacecraft -- Abstract -- 1 Introduction -- 2 Space Packet Protocol -- 3 Constructing a Hash Routing Table -- 4 Forwarding a Space Packet -- 4.1 Finding a Route -- 4.2 Forwarding a Space Packet on 1553B Buses -- 4.3 Forwarding a Space Packet on Ethernet Bus -- 4.4 Forwarding a Space Packet to Other Process -- 5 Performance Evaluation -- 6 Summary -- References -- A Design of GNSS Based Time Management System for Telecommunication Satellite -- Abstract -- 1 Introduction -- 2 Architecture of Satellite Time Management System -- 2.1 Time Management Working Principle -- 2.2 Time Management System Architecture -- 3 Time Management Strategy Design -- 3.1 Operation Mode of Time Management -- 3.2 Time Management Specific Design -- 4 Accuracy Analysis of Time Management -- 5 Conclusion -- References -- Attitude Determination Method Based on GNSS Signals Null Steering Technology -- Abstract -- 1 Introduction -- 2 Beam Access by GNSS Attitude Determination Module -- 3 GNSS Attitude Determination Technologies -- 3.1 Multi-baseline and Multi-DOA Attitude Determination Methods -- 3.2 Limitation of Carrier Phase Measurement -- 3.3 GSNS Technology for DOA Estimation -- 4 Typical Applications -- 5 Conclusion -- References -- Construction of Knowledge Graph Based on Conventional Jamming Patterns -- Abstract -- 1 Introduction -- 2 System Model -- 2.1 Anti-jamming Knowledge Graph Architecture -- 2.2 Anti-jamming Strategies of Conventional Jamming Patterns -- 3 Establishment of Communication Anti-jamming Knowledge Graph of Conventional Jamming Patterns -- 3.1 The Construction Process of Anti-jamming Knowledge Graph of Conventional Jamming Patterns -- 3.2 Construction of Anti-jamming Knowledge Graph -- 4 Results and Application.; 4.1 Overview of Anti-jamming Knowledge Graph -- 4.2 Relationship Expansion of Anti-jamming Knowledge Graph -- 5 Conclusion -- References -- Effects of Link Disruption on Licklider Transmission Protocol for Mars Communications -- Abstract -- 1 Introduction -- 2 System Model -- 3 Experimental Setup and Configurations -- 4 Numerical Experimental Results and Discussion -- 4.1 Single Link Disruption Event with Different Durations -- 4.2 More than One Link Disruption Event with Different Starting Times -- 5 Conclusions -- References -- Space Information Networks and Spacecraft System -- A Cloud Service Architecture for SDN-Based Space-Terrestrial Integrated Network -- Abstract -- 1 Introduction -- 2 Related Work -- 3 The Space-Terrestrial Integrated Network Architecture -- 3.1 SDN-Based Heterogeneous Network Convergence Architecture -- 3.2 The Space-Terrestrial Integrated Cloud Service Architecture -- 4 Application Scenarios -- 5 Conclusions -- Acknowledgement -- References -- Research on Beam Interference Optimization Strategy of LEO Constellation -- Abstract -- 1 Introduction -- 2 Periodic Beam Closing Strategy -- 2.1 Beam on/off Policy -- 2.2 Simulation Results and Analysis -- 3 Dynamic Adjustment Strategy of Beam Resources -- 3.1 Frequency Dynamic Allocation Strategy -- 3.2 Simulation Results and Analysis -- 4 Conclusion -- References -- A Full Lifecycle-Oriented Flexible Method for Satellite Design -- Abstract -- 1 Introduction -- 2 Definition of Satellite Flexibility -- 3 Methods Supporting the Design of Flexible for Full Lifecycle -- 4 Flexible Design of the Satellite -- 4.1 Flexibility of Satellite Hardware Designed -- 4.2 Flexibility of Satellite Software Designed -- 5 Conclusion -- References -- Spacecraft Information Flow Collaborative Design Model and Application -- Abstract -- 1 Introduction -- 2 Information Flow Elements -- 2.1 Entity.; 2.2 Relationship -- 3 Information Mapping Rules -- 4 Modeling of Spacecraft Collaborative Design System Based on Information Flow -- 4.1 Spacecraft Collaborative Design Process -- 4.2 Activity Model of Spacecraft Collaborative Design -- 4.3 Role Model of Spacecraft Collaborative Design -- 4.4 Information Interaction Model of Spacecraft Collaborative Design -- 5 Practice of Spacecraft Information Flow Collaborative Design -- 5.1 Division of Information Flow Elements -- 5.2 Collaborative Design Activity Model -- 5.3 Role Model of Collaborative Design -- 5.4 Information Interaction Model -- 6 Conclusion -- References -- Design of a Spacecraft Network System Based on Space-Ground Integrated Network -- Abstract -- 1 Introduction -- 2 Architecture of Spacecraft Network -- 3 Protocol Stack of Spacecraft Network -- 3.1 Application Layer -- 3.2 Transport Layer -- 3.3 Network Layer -- 3.4 Data Link Layer -- 3.5 Physical Layer -- 4 Network Communication Mode -- 4.1 Autonomous Addressing Mechanism for Spacecraft Network -- 4.2 Dynamic Routing Mechanism in Space-Ground Network -- 5 Experiment -- 6 Conclusion -- References -- A Dynamic Hashing Method for Storage Optimization of Spacecraft Verification Database -- Abstract -- 1 The Introduction -- 2 Selection of Common Algorithms -- 3 Dynamic Hash DSH Algorithm -- 3.1 The First Round of Uniform Hashing of DSH Algorithm -- 3.2 DSH Algorithm Sub-round Dynamic Partitioning -- 4 Conclusion -- References -- A Method of On-Board Dynamic Health Management of TT&amp -- C Transponder of Spacecraft -- Abstract -- 1 Introduction -- 2 Principle of Fault Detection -- 2.1 Health State -- 2.2 Fault Decision -- 2.3 Fault Removal -- 3 Design and Application of Health Management System -- 3.1 System Composition -- 3.2 Design of Fault Detection and Recovery Process -- 3.3 On-Orbit Applications -- 4 Conclusion -- References.; Structured Design Method of Spacecraft Telecommand Information Flow Based on Electronic Data Sheet -- Abstract -- 1 Introduction -- 2 The Process of Spacecraft Information Flow Design -- 3 Design of Electronic Data Sheet -- 3.1 Design Principles -- 3.2 Design of Basic Component -- 3.3 Design of Container Data Sheet -- 3.4 Design of Interface Connection Between Containers -- 4 Application of Electronic Data Sheet in Telecommand Information Flow Design -- 4.1 Design and Application Based on Layered Model -- 4.2 Output and Application of Structured File -- 5 Conclusion -- References -- A Telecommand Scheme for Spacecraft Based on High-Speed and Low-Speed Hybrid TT&amp -- C System -- Abstract -- 1 Introduction -- 2 Requirement of Spacecraft Telecommand -- 3 Space Data Link Protocols -- 4 Design of Telecommand Scheme -- 4.1 Main Ideas -- 4.2 Design of Data Flow -- 4.3 Design of Protocol -- 4.4 Further Recommendation -- 5 Summary -- References -- Spacecraft Electronic Datasheet Based Onboard Spacecraft Test System Design -- Abstract -- 1 Introduction -- 2 SEDS Based Modeling -- 3 System Architecture -- 4 Experiment and Effects -- 5 Summary -- References -- Design of Universal Software Architecture for Spacecraft Autonomous Thermal Control -- Abstract -- 1 Introduction -- 2 Analysis of Control Elements of Active Thermal Control -- 2.1 Temperature Accuracy -- 2.2 Control Period and Time Slot of Thermal Control -- 2.3 Switch Mode of Heater -- 2.4 Energy Constraints -- 3 Universal Architecture for Active Thermal Control -- 3.1 Universal Software Architecture Based on Software Components -- 3.2 Hardware Composition of Avionics System -- 3.3 Control Process of Software Architecture -- 4 Analysis and Evaluation of Application Effect -- 5 Conclusions -- References -- A Network Traffic Collection System for Space Information Networks Emulation Platform -- Abstract.; 1 Introduction.
• Sommario/riassunto: This book constitutes the refereed post-conference proceedings of the 12th International Conference on Wireless and Satellite Services, WiSATS 2021, held in Nanjing, China, in September 2020. Due to COVID-19 pandemic the conference was held virtually. The 79 full papers were carefully reviewed and selected from 140 submissions. The conference’s central theme is the means of using the wireless and satellite services directly to the user for personal communications, multimedia and location identification. The services enabled by WiSATS not only cover the requirements of an ordinary citizen but also provide personal and public services for global coverage communications as the applications of internet of things. .