Airborne and spaceborne altimeters provide measurements of sea-ice elevation, from which sea-ice freeboard and thickness may be derived. Observations of the Arctic ice pack by satellite altimeters indicate a significant decline in ice thickness, and volume, over the last decade. NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2) is a next-generation laser altimeter designed to continue key sea-ice observations through the end of this decade. An airborne simulator for ICESat-2, the...
Topics: NASA Technical Reports Server (NTRS), SEA ICE, ARCTIC REGIONS, LASER ALTIMETERS, ELEVATION,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), AIR TRAFFIC CONTROL, NATIONAL AIRSPACE SYSTEM, ASYNCHRONOUS...
In Spring 2013, high level NASA and Boeing management were seeking opportunities to collaborate on a flight test activity involving the ecoDemonstrator. The Airspace Systems Program Office identified FIM as a viable candidate. ATD-1 accepted the challenge. Work began in July for a December 2013 flight test.
Topics: NASA Technical Reports Server (NTRS), AIR TRAFFIC CONTROL, RESEARCH AIRCRAFT, AIRCRAFT APPROACH...
Enabling efficient arrivals for the NextGen Air Traffic Management System and developing a set of integrated decision support tools to reduce the high cognitive workload so that controllers are able to simultaneously achieve safe, efficient, and expedient operations at high traffic demand levels.
Topics: NASA Technical Reports Server (NTRS), AIR TRAFFIC CONTROL, MANAGEMENT SYSTEMS, WORKLOADS...
Develop a simulation and modeling capability that includes: (a) Assessment of multiple parallel universes, (b) Accepts data feeds, (c) Allows for live virtual constructive distribute environment, (d) Enables integrated examinations of concepts, algorithms, technologies and National Airspace System (NAS) architectures.
Topics: NASA Technical Reports Server (NTRS), AIRSPACE, NATIONAL AIRSPACE SYSTEM, ASYNCHRONOUS TRANSFER...
A monitoring system is disclosed, which includes a base station and at least one sensor unit that is separate from the base station. The at least one sensor unit resides in a dormant state until it is awakened by the triggering of a vibration-sensitive switch. Once awakened, the sensor may take a measurement, and then transmit to the base station the measurement. Once data is transmitted from the sensor to the base station, the sensor may return to its dormant state. There may be various...
Topics: NASA Technical Reports Server (NTRS), SYSTEMS HEALTH MONITORING, ASYNCHRONOUS TRANSFER MODE, DATA...
Abstract-Next Generation Air Transportation System (NextGen) applications reliant upon aircraft data links such as Automatic Dependent Surveillance-Broadcast (ADS-B) offer a sweeping modernization of the National Airspace System (NAS), but the aviation stakeholder community has not yet established a positive business case for equipage and message content standards remain in flux. It is necessary to transition promising Air Traffic Management (ATM) Concepts of Operations (ConOps) from simulation...
Topics: NASA Technical Reports Server (NTRS), ASYNCHRONOUS TRANSFER MODE, NATIONAL AIRSPACE SYSTEM, AIR...
High altitude balloon based facilities can make solar cell calibration measurements above 99.5% of the atmosphere to use for adjusting laboratory solar simulators. While close to on-orbit illumination, the small attenuation to the spectra may result in under measurements of solar cell parameters. Variations of stratospheric weather, may produce flight-to-flight measurement variations. To support the NSCAP effort, this work quantifies some of the effects on solar cell short circuit current (Isc)...
Topics: NASA Technical Reports Server (NTRS), SOLAR CELLS, GAS MIXTURES, ASYNCHRONOUS TRANSFER MODE, SHORT...
The high-speed ring bus at the Jet Propulsion Laboratory (JPL) allows for future growth trends in spacecraft seen with future scientific missions. This innovation constitutes an enhancement of the 1393 bus as documented in the Institute of Electrical and Electronics Engineers (IEEE) 1393-1999 standard for a spaceborne fiber-optic data bus. It allows for high-bandwidth and time synchronization of all nodes on the ring. The JPL ring bus allows for interconnection of active units with autonomous...
Topics: NASA Technical Reports Server (NTRS), BUS CONDUCTORS, HIGH SPEED, CONTROL EQUIPMENT, SPACECRAFT...
Many U.S. Navy systems were built on the fly and have encountered interoperability problems at sea, such as erroneous dual/multiple track designations, misidentification/track identity conflicts, report responsibility conflicts, friendly tracks displayed as unknown/pending, tracks dropped without operator action, different track identities of at different ships, etc. To identify and fix these interoperability problems, the Navy instituted the Distributed Engineering Plant (DEP) testing program,...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *GOAL PROGRAMMING, *TEST AND EVALUATION,...
5
5.0
2009
2009
2009
by
Souders, Steve
texts
eye 5
favorite 3
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xix, 231 p. : 24 cm
Topics: Web sites -- Design, Web sites, Web site development, JavaScript (Computer program language),...
8
8.0
2008
2008
2008
by
Morrison, Michael, 1970-
texts
eye 8
favorite 0
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xvii, 291 p. : 24 cm. +
Topics: Ajax (Web site development technology), Web site development, JavaScript (Computer program...
The Advanced Prototyping, Engineering & eXperimentation (APEX) Laboratory at the Aviation and Missile Research, Development, and Engineering Center (AMRDEC) supports many distributed simulation exercises utilizing the Defense Research Engineering Network (DREN). A mix of classified and unclassified simulation exercises have recently been held, utilizing the Type B Asynchronous Transfer Mode (ATM) services provided by the DREN. Upcoming unclassified experiments will involve participants that...
Topics: DTIC Archive, Fraser, Laurie, ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING CENTER REDSTONE...
9
9.0
2006
2006
2006
by
Purvis, Michael
texts
eye 9
favorite 1
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xxiii, 358 p. : 24 cm
Topics: Ajax (Web site development technology), Web sites -- Authoring programs, Asynchronous transfer...
17
17
2006
2006
2006
by
Holzner, Steven
texts
eye 17
favorite 0
comment 0
Topics: JavaScript (Computer program language), Web site development, Asynchronous transfer mode
28
28
2006
2006
2006
by
Moroney, Laurence; SpringerLink (Online service)
texts
eye 28
favorite 1
comment 0
Topics: Internet, Internet - World Wide Web, Computers, Computer - Internet, Computer Books: Web...
28
28
2006
2006
2006
by
Zakas, Nicholas C
texts
eye 28
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xxiii, 406 pages : 24 cm
Topics: Ajax (Web site development technology), Web sites -- Authoring programs, JavaScript (Computer...
3
3.0
2006
2006
2006
by
McLaughlin, Brett
texts
eye 3
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xxxi, 413 p. : 24 cm
Topics: JavaScript (Computer program language), Asynchronous transfer mode, Web site development, World...
2
2.0
2006
2006
2006
by
Schutta, Nathaniel T
texts
eye 2
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xix, 313 p. : 24 cm
Topics: Ajax (Web site development technology), JavaScript (Computer program language), Web site...
86
86
2006
2006
2006
by
Gross, Christian
texts
eye 86
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"The expert's voice in Web development"--Cover
Topics: JavaScript (Computer program language), Asynchronous transfer mode, World Wide Web, JavaScript...
17
17
2006
2006
2006
by
Holzner, Steven
texts
eye 17
favorite 0
comment 0
Topics: JavaScript (Computer program language), Web site development, Asynchronous transfer mode
A gateway has been developed to enable digital communication between (1) the high-rate receiving equipment at NASA's White Sands complex and (2) a standard terrestrial digital communication network at data rates up to 622 Mb/s. The design of this gateway can also be adapted for use in commercial Earth/satellite and digital communication networks, and in terrestrial digital communication networks that include wireless subnetworks. Gateway as used here signifies an electronic circuit that serves...
Topics: NASA Technical Reports Server (NTRS), ASYNCHRONOUS TRANSFER MODE, COMMUNICATION NETWORKS, PULSE...
317
317
2005
2005
2005
by
Smith, Timothy D
texts
eye 317
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As the Nation moves towards a hydrogen economy the shape of aviation will change dramatically. To accommodate a switch to hydrogen the aircraft designs, propulsion, and power systems will look much different than the systems of today. Hydrogen will enable a number of new aircraft capabilities from high altitude long endurance remotely operated aircraft (HALE ROA) that will fly weeks to months without refueling to clean, zero emissions transport aircraft. Design and development of new hydrogen...
Topics: COMMUNICATION, ACTS, ASYNCHRONOUS TRANSFER MODE, PROTOCOL (COMPUTERS), COMMERCE, EXTREMELY HIGH...
This report presents the test results of the Swift Start algorithm in single-flow and multiple-flow testbeds under the effects of high propagation delays, various slow bottlenecks, and small queue sizes. Although this algorithm estimates capacity and implements packet pacing, the findings were that in a heavily congested link, the Swift Start algorithm will not be applicable. The reason is that the bottleneck estimation is falsely influenced by timeouts induced by retransmissions and the...
Topics: NASA Technical Reports Server (NTRS), PROTOCOL (COMPUTERS), SPACE COMMUNICATION, ALGORITHMS,...
Since December 2002 the Naval Research Laboratory (NRL) has been evaluating an Altix 3000, the newest high performance computing system available from Silicon Graphics, Inc. (SCI). The Altix is a departure from the previous products from SGI in that instead of using MIPS processors and the IRIX operating system, the Altix uses the Intel Itanium IA-64 processor and SGI ProPack (based on Linux Red Hat) operating system. The Altix still has the brick concept of system configuration and the SGI...
Topics: DTIC Archive, Anderson, Wendell, Rosenberg, Robert, Lanzagorta, Marco, NAVAL RESEARCH LAB STENNIS...
In the context buffer models fed by independent on-off fluid sources, the author explores conditions under which determinism minimizes the stationary backlog. These comparison results are couched in terms of the convex ordering for distributions. He shows that increased variability in the on-duration random variable results in greater variability of the corresponding backlog. While it appears that, in general, increased variability in the off-duration random variable does not necessarily imply...
Topics: DTIC Archive, Makowski, Armand M, MARYLAND UNIV COLLEGE PARK INST FOR SYSTEMS RESEARCH, *STOCHASTIC...
This report considers the problem of bounding the loss rate of the aggregation of independent on-off sources in a bufferless model by the loss rate resulting from the aggregation of i.i.d. on-off sources. This is done through a unified framework based on the interplay of well-known results from the theory of variability orderings with the concept of majorization ordering. The author uses a basic comparison result to readily derive a bound of Rasmussen et al. for heterogeneous sources and an...
Topics: DTIC Archive, Makowski, Armand M, MARYLAND UNIV COLLEGE PARK INST FOR SYSTEMS RESEARCH, *STOCHASTIC...
This effort addresses the lack of delivery guarantees for encrypted messages that transit through firewall security devices bridging high data rate networks. Firewalls that can easily and dependably handle these high data rates are the main goal of this effort. Generally, current firewall technology is either high-performance or high-security. Defined here is an architecture for decomposing network protocols into the high-security, authentication/access control portion, and the...
Topics: DTIC Archive, Knobbe, Roger, TRUSTED INFORMATION SYSTEMS NETWORK ASSOCIATES INC LOS ANGELES CA,...
The ATM Sentinel project comprised three phases. The first phase was a review of relevant ATM protocol and security documents to determine the state of the art and develop a concept for the system. During this phase we also identified attack scenarios that were specific to components of the ATM PNNI specification and that could result in serious degradation of an ATM network. These attack scenarios were provided to our subcontractor, Professor Sumit Ghosh of Arizona State University, to develop...
Topics: DTIC Archive, Smith, Robert N, GENERAL DYNAMICS SCOTTSDALE AZ, *NETWORKS, *INTRUSION DETECTION,...
One of the primary challenges in today's computer networking world is providing enough bandwidth to achieve true broadband access in the local, or last-mile, access network. Over the course of the last decade or so, there has been a tremendous increase in the bandwidth of the core network in the U.S. In fact, a substantial portion of this core network, which primarily consists of fiber optic technology, is unused. This is primarily due to the lack of bandwidth in the last-mile access network....
Topics: DTIC Archive, Schwartz, Jason L, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTER NETWORKS,...
Who Should Read This Report and Why? This report should be read by all who are interested in the contracting procedures of the Air National Guard. It addresses the Air National Guard's right to make a unilateral decision not to exercise an option on a contract. We performed this audit in response to a request from Congressman Roscoe G. Bartlett. The request was based on information the Congressman received from both the Air National Guard and Digicon Corporation regarding the Air National...
Topics: DTIC Archive, INSPECTOR GENERAL DEPT OF DEFENSE ARLINGTON VA, *NATIONAL GUARD, *CONTRACT...
This report covers work done in three areas: 1) Active destination-oriented QoS support; 2) Active and secure routing and multicasting; 3) Trusted dissemination of active packets.
Topics: DTIC Archive, Aceves, J J, CALIFORNIA UNIV SANTA CRUZ, *COMPUTER NETWORKS, *INTERNET, *SECURE...
Military communications networks typically employ a gateway multiplexer to aggregate all communications traffic onto a single link. These multiplexers typically use a static bandwidth allocation method via time-division multiplexing (TDM). Inefficiencies occur when a high-bandwidth circuit, e.g., a video teleconferencing circuit, is relatively inactive rendering a considerable portion of the aggregate bandwidth wasted while inactive. Dynamic bandwidth allocation (DBA) reclaims unused bandwidth...
Topics: DTIC Archive, Schwamb, Timothy M, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF...
Recent advances from the theory of multivariate stochastic orderings can be used to formalize the folk theorem to the effect that positive correlations lead to larger buffer levels at a discrete-time infinite capacity multiplexer queue. For instance, it is known that if the input traffic is larger than its independent version in the supermodular (sm) ordering, then their corresponding buffer contents are similarly ordered in the increasing convex (icx) ordering. A sufficient condition for the...
Topics: DTIC Archive, Vanichpun, Sarut, MARYLAND UNIV COLLEGE PARK INST FOR SYSTEMS RESEARCH, *STOCHASTIC...
1
1.0
2002
2002
2002
by
Tarman, Thomas D
texts
eye 1
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xxi, 293 pages : 24 cm
Topics: Computer networks -- Security measures, Asynchronous transfer mode, ATM, Netzwerk, Sicherheit
4
4.0
2002
2002
2002
by
Kyas, Othmar
texts
eye 4
favorite 0
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xv, 526 p. : 24 cm
Topics: Asynchronous transfer mode, Computer networks
This MURI grant was reviewed within the overall program in July of 1998 by government science and technology managers from DARPA, BMDO, and DDRandE as well as by the AFOSR program manager and found superlative in achieving stated goals and program objectives. Documentation of specific technical progress is retained with the grant funding records in the form of annual technical reports. The MOST center successfully addressed the following aspects of optical switching technology within the MURI...
Topics: DTIC Archive, Bowers, John E, CALIFORNIA UNIV SANTA BARBARA DEPT OF ELECTRICAL AND COMPUTER...
This is the final report for the grant F49620-96-1-0472 which ended on Dec. 31, 2000. During the period from September 1996 through December 2000, the main objectives were to: 1. Build a research infrastructure (equipment, faculty, students) 2. Develop faculty research opportunities 3. Develop a graduate student research program within the Computer Science and Electrical Engineering Departments.
Topics: DTIC Archive, Roy, Sumit, TEXAS UNIV AT SAN ANTONIO, *COMMUNICATIONS NETWORKS, MULTIPROCESSORS,...
A fiber-optic network derived by a set of ATM (asynchronous transfer mode) switches in association with CAD (computer aided diagnosis/detection) algorithms has been set up as the first prototype of on-line, real-time cancer detection/diagnostic system. Expanding diagnostics and treatment beyond the local level will bring better health care to a wider range of people at a reduced cost. This work describes the Asynchronous Transfer Mode (ATM) Teleradiology Network (ATMTN) and the high-speed fiber...
Topics: DTIC Archive, Sheybani, Ehsan, HILLSBOUOUGH COMMUNITY COLL YBOR CITY FL DEPT OF COMPUTER SCIENCE,...
To optimize bandwidth efficiency, the natural limitations of each network-supported data type must be overcome or mitigated. This paper discusses issues affecting bandwidth efficiency through the U.S. Navy's bandwidth-constrained wide-area network (WAN). The paper details the prevalent data types found in the naval environment and describes the characteristics associated with each data type. Commercial, standards-based link layer protocols that have widespread application in Navy networks also...
Topics: DTIC Archive, Landers, Todd, SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA, *OPTIMIZATION,...
ATM USA provides the framework for building security solutions for DoD ATM users. This architecture can be configured to support encryption devices at the local workstation, at the ATM switch, and at enclave boundaries (including cell and link encryptors). The enclave security policy can be used to provide a fine grain control over who has access to ATM services, the type and nature of the services that can be accessed, when they can be accessed, etc. The policy can also provide flexibility to...
Topics: DTIC Archive, Long, Douglas, ODYSSEY RESEARCH ASSOCIATES INC ITHACANY, *CRYPTOGRAPHY, *SECURITY,...
With the emergence of a network-centric philosophy of military operations, the behavior of video applications over resource-constrained information networks is of increasing interest in the development of future naval information systems. This thesis analyzes the impact of compression, delay variance, and channel noise on perceived networked video quality using commercially available off-the-shelf equipment and software. An experimental setup for packet video is developed for quantitative and...
Topics: DTIC Archive, Kinney, Albert C, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *NETWORKS, *VIDEO SIGNALS,...
The Internet was initially design for non real-time data communications and hence does not provide any Quality of Service (QoS). The next generation Internet will be characterized by high speed and QoS guarantee. The aim of this paper is to develop a prioritized early packet discard (PEPD) scheme for ATM switches to provide service differentiation and QoS guarantee to end applications running over next generation Internet. The proposed PEPD scheme differs from previous schemes by taking into...
Topics: NASA Technical Reports Server (NTRS), ASYNCHRONOUS TRANSFER MODE, INTERNETS, MARKOV CHAINS,...
Asynchronous Transfer Mode (ATM) has been introduced into the land tactical communications system (specifically the Parakeet system) and offers the potential for increasing the effectiveness of the communications trunks by dynamically sharing the capacity between competing demands. Such a capability has been limited in respect of the trunks between the Parakeet circuit switches since Parakeet uses military standard protocols that do not integrate easily with the civil standard ATM. The Parakeet...
Topics: DTIC Archive, Blair, W D, DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION SALISBURY (AUSTRALIA)...
ATM technology has enjoyed great success, due in great part, for its ability to support a whole range of applications with Quality of Service (QoS) guarantees. Consequently, ATM has become of great interest for the support of services over military telecommunications networks. This report is provided as part of a study on the feasibility of military voice services over wireless ATM networks. In this study we are concerned with the support of low data rate and delay sensitive applications over...
Topics: DTIC Archive, Villasenor-Gonzalez, Luis, DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO), *VOICE...
Wireless ATM was designed to extend the support of broadband, multimedia services provided in fixed ATM networks to the wireless/mobile environment in a seamless and efficient manner. It is a candidate wireless networking technology for future tactical military networks which have adopted ATM in the core network. The bandwidth-limited, error-prone nature of wireless links poses significant challenges in the design of wireless ATM. This report is part of a study on the feasibility of military...
Topics: DTIC Archive, Tsakiridou, Sophia, DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO), *COMMUNICATIONS...
This research program focused on the development of optoelectronic interconnection networks that combine communication and processing capabilities in network hardware to accelerate distributed computing applications. On the architecture front, we have designed an optoelectronic hardware module that can be used as a building block of smart networks with application-specific performance and cost requirements. A detailed technological comparison between the optoelectronic design and an equivalent...
Topics: DTIC Archive, Kiamilev, Fouad E, NORTH CAROLINA UNIV AT CHARLOTTE OFFICEOF RESEARCH, *OPTICAL...
We describe two enhancements to the AFS distributed file system intended to improve the performance of large file fetches over high-speed networks. Selective caching AFS bypasses the client local disk when fetching files, which improves the performance of applications such as streaming video, for which local caching is of little benefit, and gives client processor and cache resources to applications for which local caching is an advantage. Split-path AFS augments the conventional UDP-based...
Topics: DTIC Archive, Antonelli, Charles J, MICHIGAN UNIV ANN ARBOR CENTER FOR INFORMATION TECHNOLOGY...
1
1.0
2001
2001
2001
by
Brandt, Hartmut, 1963-
texts
eye 1
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xviii, 252 p. : 25 cm
Topics: Asynchronous transfer mode, Signals and signaling
4
4.0
texts
eye 4
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xxvii, 517 p. : 24 cm
Topics: Cisco Systems, Inc, Internet telephony, Frame relay (Data transmission), Asynchronous transfer mode
