Download or read book Duplex Direct Data Distribution System written by and published by . This book was released on 2001 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Duplex Direct Data Distribution System written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-30 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA Glenn Research Center (GRC) is developing and demonstrating communications and network technologies that are helping to enable the near-Earth space Internet. GRC envisions several service categories. The first of these categories is direct data distribution or D3 (pronounced "D-cubed"). Commercially provided D3 will make it possible to download a data set from a spacecraft, like the International Space Station. as easily as one can extract a file from a remote server today, using a file transfer protocol. In a second category, NASA spacecraft will make use of commercial satellite communication (SATCOM) systems. Some of those services will come from purchasing time on unused transponders that cover landmasses. While it is likely there will be gaps in service coverage, Internet services should be available using these systems. This report addresses alternative methods of implementing a full duplex enhancement of the GRC developed experimental Ka-Band Direct Data Distribution (D3) space-to-ground communication link. The resulting duplex version is called the Duplex Direct Data Distribution (D4) system. The D4 system is intended to provide high-data-rate commercial direct or internet-based communications service between the NASA spacecraft in low earth orbit (LEO) and the respective principal investigators associated with these spacecraft. Candidate commercial services were assessed regarding their near-term potential to meet NASA requirements. Candidates included Ka-band and V-band geostationary orbit and non-geostationary orbit satellite relay services and direct downlink ("LEO teleport") services. End-to-end systems concepts were examined and characterized in terms of alternative link layer architectures. Alternatives included a Direct Link, a Relay Link, a Hybrid Link, and a Dual Mode Link. The direct link assessment examined sample ground terminal placements and antenna angle issues. The SATCOM-based alternatives examined existing or pr

Download or read book DUPLEX DIRECT DATA DISTRIBUTION SYSTEM FINAL REPORT NASA written by United States. National Aeronautics and Space Administration and published by . This book was released on 2002* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Technology 2001 written by and published by DIANE Publishing. This book was released on with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 2004 with total page 1102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Direct Data Distribution From Low Earth Orbit written by and published by . This book was released on 1997 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dictionary of Acronyms and Technical Abbreviations written by Jakob Vlietstra and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Dictionary covers information and communication technology (ICT), including hardware and software; information networks, including the Internet and the World Wide Web; automatic control; and ICT-related computer-aided fields. The Dictionary also lists abbreviated names of relevant organizations, conferences, symposia and workshops. This reference is important for all practitioners and users in the areas mentioned above, and those who consult or write technical material. This Second Edition contains 10,000 new entries, for a total of 33,000.

Download or read book Datamation written by and published by . This book was released on 1981 with total page 1026 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book StarBriefs Plus written by Andre Heck and published by Springer Science & Business Media. This book was released on 2004-03-31 with total page 1102 pages. Available in PDF, EPUB and Kindle. Book excerpt: With about 200,000 entries, StarBriefs Plus represents the most comprehensive and accurately validated collection of abbreviations, acronyms, contractions and symbols within astronomy, related space sciences and other related fields. As such, this invaluable reference source (and its companion volume, StarGuides Plus) should be on the reference shelf of every library, organization or individual with any interest in these areas. Besides astronomy and associated space sciences, related fields such as aeronautics, aeronomy, astronautics, atmospheric sciences, chemistry, communications, computer sciences, data processing, education, electronics, engineering, energetics, environment, geodesy, geophysics, information handling, management, mathematics, meteorology, optics, physics, remote sensing, and so on, are also covered when justified. Terms in common use and/or of general interest have also been included where appropriate.

Download or read book DATAMATION written by Information Access Company and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976-05 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book StarBriefs 2001 written by and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 805 pages. Available in PDF, EPUB and Kindle. Book excerpt: This compilation probably looks like one of the craziest things a human being could spend his or her time on. Yet nobody would wonder at someone taking a short walk every day - after twenty five years that person would have covered a surprisingly long distance. This is exactly the story behind this list, which appeared first as a few pages within the directory StarGuides (or whatever name it had at that time) and as a distinct sister publication since 1990. The idea behind this dictionary is to offer astronomers and related space scientists practical assistance in decoding the numerous abbreviations, acronyms, contractions and symbols which they might encounter in all aspects of the vast range of their professional activities, including traveling. Perhaps it is a bit paradoxical, but if scientists quickly grasp the meaning of an acronym solely in their own specific discipline, they will probably encounter more difficulties when dealing with adjacent fields. It is for this purpose that this dictionary might be most often used. Scientists might also refer to this compilation in order to avoid identifying a project by an acronym which already has too many meanings or confused definitions.

Download or read book Wireless Communications written by International Engineering Consortium and published by Intl. Engineering Consortiu. This book was released on 2006 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Containing essays from leading experts in the industry that discuss academic theories and practical applications of wireless communications, this book focuses on the latest wireless technologies and advancements. A diverse volume, it seeks to shed light on such topics as business strategies and current trends while combining the perspectives of many specialists across the nation.

Download or read book Elsevier s Dictionary of Technical Abbreviations written by S. Bobryakov and published by Elsevier. This book was released on 2005-03-23 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The English-Russian dictionary of technical abbreviations contains nearly 65,000 entries covering various fields and subfields of engineering and technology. Abbreviations are widely used in technical literature and, as a rule, they create difficulties for the reader. Numerous abbreviations are used in technical literature dealing with space, agriculture, electronics, computer science, chemistry, thermodynamics, nuclear engineering, refrigeration, cryogenics, machinery, aviation, business, accounting, optics, radio electronics, and military fields, including abbreviations used on a wide scale by the Navy, Airforce and the Army.In many instances the same abbreviation is used in most different fields of engineering and technology though depicting different notions. There are cases when the same abbreviation may have dozen of meanings, depending on the specific field of engineering.The entries are arranged in alphabetical order. A wide range of literature has been explored for the selection and translation of the abbreviations. The dictionary has been compiled by comparing parallel texts in both languages, and by consultation with experts.This publication will be invaluable to the personnel of designing bureaus and research institutions, and also to translators, scientists, researchers, designers and university personnel dealing with various fields of engineering and technology.approx. 125,000 terms

Download or read book Process Control Systems written by Fran. Jovic and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stratification of computer tasks 94 Example I 94 Example 2 96 Controllevels and computer input/output hardware 104 Leveli 105 Level 2 118 Level 3 118 Level4 118 Level5 119 Characteristics of process control computer systems 119 A survey of process control computer hardware 120 Communication codes and circuits 138 Channe1 capacity 138 Types of connection and communication hardware 140 Practical suggestions and recommendations 152 Rcferences 153 Part II: The Role of Software in Process Control Systems 155 Chapter 4: The relative roles of software and hardware 157 In troduction 157 Data processing 158 Hardware 159 Computingpower 163 Software for process control data processing 169 Process software 170 Intercomputer communication software 173 Message switching software 173 Software for engineering ca1culations 173 Extcnded real-time software 173 Software versus hardware 174 Program loop 175 References 183 Chapter 5: System software 185 Introduction 185 Basic concepts of real-time operating systems 186 Structure and functions of real-time operating systems 190 Data and symbols for the operating system 200 System software 204 Cost, safety and reliability of operating system software 208 References 209 Chapter 6: Application pro grams and databases 211 Introduction 211 Application program tasks 211 Structure and timing requirement of application programs 220 Direct communication 227 Multiprogramming constraints 228 Database and basic process software 233 Access to database 235 Basic faciJities of an on-line database 236 Database organization 240 Contention resolution 243 Distributed database 244 Extended real-time software 247 Referenees 257 Part III: The Man-Machine Interface 259