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20100017455 Oasis Systems, Inc., Lexington, MA USA; Research Associates for Defense Conversion, Inc., Marcy, NY, USA Cellular Class Encoding Approach to Increasing Efficiency of Nearest Neighbor Searching Huggins, Mark; Lawson, Aaron; Smolenski, Brett; March 26, 2009; 5 pp.; In English; 35th International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 14 - 19 Mar. 2010, Dallas, TX, USA; Original contains color illustrations Contract(s)/Grant(s): FA8750-08-C-0029; Proj-3188; 35885G Report No.(s): AD-A517235; AFRL-RI-RS-TP-2010-9; No Copyright; Avail.: Defense Technical Information Center (DTIC) ONLINE: http://hdl.handle.net/100.2/ADA517235 Nearest neighbor searching (NNS) is a common classification method, but its brute force implementation is inefficient for dimensions greater than 10. We present Cellular Class Encoding (CCE) as an alternative, full-search equivalent shown to be 1.1-1.8 times faster than BF on real-world, 14-dimensional data sets. Given a query in an indexed cell of a partitioned space, the CCE’s efficiency is achieved by only performing NNS on those database elements which could not be eliminated a priori as impossible nearest neighbors of vectors residing in that cell. To ensure CCE is a viable alternative for real-world applications, we use VQ Speaker ID as a testbed application and present results. DTIC Coding; Information Retrieval; Speech 20100017456 Texas Univ., Dallas, TX, USA; Research Associates for Defense Conversion, Inc., Marcy, NY, USA Dialect Distance Assessment Based on 2-Dimensional Pitch Slope Features and Kullback Leibler Divergence Mehrabani, Mahnoosh; Boril, Hynek; Hansen, John H; April 8, 2009; 5 pp.; In English; 35th International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 14 - 19 Mar. 2010, Dallas, TX, USA; Original contains color illustrations Contract(s)/Grant(s): FA8750-05-C-0029; FA8750-09-C-0067; Proj-3188; 35885G Report No.(s): AD-A517234; AFRL-RI-RS-TP-2010-7; No Copyright; Avail.: Defense Technical Information Center (DTIC) ONLINE: http://hdl.handle.net/100.2/ADA517234 Dialect variations of a language have a severe impact on the performance of speech systems. Knowing how close or separate dialects are in a given language space provides useful information to predict or improve, system performance when there is a mismatch between train and test data. Distance measures have been used in several applications of speech processing, including speech recognition, speech coding, and speech synthesis. Apart from phonetic measures, little if any work has been done on dialect distance measurement. This method of dialect separation assessment based on modeling 2D pitch slope patterns within dialects is proposed. Kullback-Leibler divergence is employed to compare the obtained statistical models. The presented scheme is evaluated on a corpus of Arabic dialects. The sensitivity of the proposed measure to changes on input data is quantified. It is also shown in a perceptive evaluation that the presented objective approach of dialect distance measurement correlates well with subjective distances. DTIC Distance Measuring Equipment; Divergence; Slopes; Speech; Speech Recognition 20100017500 State Univ. of New York, Buffalo, NY USA; Air Force Research Lab., Rome, NY, USA Minimum Total-Squared-Correlation Quaternary Signature Sets: New Bounds and Optimal Designs Li, Ming; Batalama, Stella N.; Pados, Dimitris A.; Matyjas, John D.; December 2009; 11 pp.; In English; Original contains color illustrations Contract(s)/Grant(s): FA8750-08-1-0063; Proj-ANCL; 62702F Report No.(s): AD-A517403; AFRL-RI-RS-TP-2010-15; No Copyright; Avail.: Defense Technical Information Center (DTIC) We derive new bounds on the total squared correlation (TSC) of quaternary (quadriphase) signature/sequence sets for all lengths L and set sizes K. Then, for all K, L, we design minimum-TSC optimal sets that meet the new bounds with equality. Direct numerical comparison with the TSC value of the recently obtained optimal binary sets shows under what K, L realizations gains are materialized by moving from the binary to the quaternary code-division multiplexing alphabet. On the other hand, comparison with the Welch TSC value for real/complex-field sets shows that, arguably, not much is to be gained 60
y raising the alphabet size above four for any K, L. The sum-capacity (as well as the maximum squared correlation and total asymptotic efficiency) of minimum TSC quaternary sets is also evaluated in closed-form and contrasted against the sum capacity of minimum-TSC optimal binary and real/complex sets. DTIC Code Division Multiple Access; Multiplexing; Signatures 20100017560 State Univ. of New York, Buffalo, NY USA New Bounds on the Total-Squared-Correlation of Quaternary Signature Sets and Optimal Designs Li, Ming; Batalama, Stella N.; Pados, Dimitris A.; Matyjas, John D.; March 2010; 6 pp.; In English; IEEE Global Communications Conference, IEEE GLOBECOM 2009,, 30 Nov. - 4 Dec. 2009, Honolulu, HI, USA; Original contains color illustrations Contract(s)/Grant(s): FA8750-08-1-0063; Proj-ANCL Report No.(s): AD-A517398; No Copyright; Avail.: Defense Technical Information Center (DTIC) We derive new bounds on the total squared correlation (TSC) of quaternary (quadriphase) signature/sequence sets for all lengths and set sizes. Then we design minimum-TSC optimal sets that meet the new bounds with equality. Direct numerical comparison with the TSC value of the recently obtained optimal bindary sets shows what gains are materialized by moving from the binary to the quaternary code-division multiplexing alphabet. On the other hand, comparison with the Welch TSC value for real/complex-field sets shows that, arguably, not much is to be gained by raising the alphabet size above four. DTIC Code Division Multiple Access; Multiplexing; Signatures 20100017563 State Univ. of New York, Buffalo, NY USA Cognitive CDMA Channelization Gao, Kanke; Batalama, Stella N.; Pados, Dimitris A.; Matyjas, John D.; Proceedings of the Asilomar Conference on Signals, Systems and Computers, 2009; March 2010; 18 pp.; In English; 43rd Asilomar Conference on Signals, Systems, and Computers, 1-4Nov2009, Pacific Grove, CA, USA; Original contains color illustrations Contract(s)/Grant(s): FA8750-08-1-0063; Proj-ANCL; 62702F Report No.(s): AD-A517395; AFRL-RI-RS-TP-2010-13; No Copyright; Avail.: Defense Technical Information Center (DTIC) We consider the problem of simultaneous power and code-channel allocation of a secondary transmitter/receiver pair coexisting with a primary code-division-multiplexed (CDM) system. Our objective is to find the optimum transmitting power and code sequence of the secondary user that maximizes the signal-to-interference-plus-noise ratio (SINR) at the output of the maximum SINR linear receiver while, at the same time, the SINR of all primary users at the output of their max-SINR receiver is maintained above a certain threshold. This is an NP-hard non-convex optimization problem. In this paper, we propose a novel feasible suboptimum solution using semidefinite programming. Simulation studies illustrate the theoretical developments. DTIC Code Division Multiple Access; Code Division Multiplexing; Multiplexing; Optimization 20100017567 State Univ. of New York, Buffalo, NY USA; State Univ. of New York, Buffalo, NY, USA ROSA: Distributed Joint Routing and Dynamic Spectrum Allocation in Cognitive Radio Ad Hoc Networks Ding, Lei; Melodia, Tommaso; Batalama, Stella; Medley, Michael J.; Proceedings of the 12th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems; March 2010, pp. 13 - 21; In English; 12th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems, 26 - 29 Oct. 2009, Tenerife, Canary Islands, Spain; Original contains color illustrations Contract(s)/Grant(s): FA8750-08-1-0063; Proj-ANCL Report No.(s): AD-A517383; No Copyright; Avail.: Defense Technical Information Center (DTIC) Throughput maximization is one of the main challenges in cognitive radio ad hoc networks, where local spectrum resources may change from time to time and hop-by-hop. For this reason, a cross-layer opportunistic spectrum access and dynamic routing algorithm for cognitive radio networks is proposed, called ROSA (ROuting and Spectrum Allocation algorithm). Through local control actions, ROSA aims at maximizing the network throughput by performing joint routing, 61
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Since its founding, NASA has been d
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NASA STI Availability Information N
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46 Geophysics .....................
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02 AERODYNAMICS Includes aerodynami
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limited and/or other common visuali
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is a computer-based thickness desig
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20100017735 Government Accountabili
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20100017218 NASA, Washington, DC, U
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20100017246 Naval Research Lab., Mo
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and post-shot core analysis to quan
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20100017248 Naval Research Lab., Mo
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atmosphere, and vice versa. These s
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planned downtime; and the VARIANCE
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20100017802 Water Supply Solutions,
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tested. Although installation instr
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containing an epidermal growth fact
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a prolonged QTc interval. The poten
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53 BEHAVIORAL SCIENCES Includes psy
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20100017234 NASA Marshall Space Fli
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20100017702 NASA Johnson Space Cent
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papers include mathematical analysi
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20100017392 Royal Inst. of Tech., S
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with these agents. It is not yet cl
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so-called correction equation. In a
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processes by using the quantum mult
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portal to bring together DoD softwa
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62 COMPUTER SYSTEMS Includes comput
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middleware to support tactical comm
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R&D by the authors. SSC is building
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20100017553 Air Force Research Lab.
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20100017868 Colorado Water Conserva
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activities: a) Access and analyze A
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70 PHYSICS (GENERAL) Includes gener
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etween closely spaced electronic su
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projectiles and/or spin-polarized t
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test run. With these lifetimes we c
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Additionally, on-orbit ventilation
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are made that yield better agreemen
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20100017095 Princeton Univ., NJ USA
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20100017874 Lawrence Livermore Nati
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(GK)-electron and fully-kinetic (FK
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slowness surfaces) in the damaged m
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provides a set of metrics for measu
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it is an exploration of ad-hoc retr
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20100017711 Jet Propulsion Lab., Ca
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Ares V is a heavy lift vehicle bein
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89 ASTRONOMY Includes observations
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channelizer for submillimeter spect
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20100017373 Bay Area Environmental
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20100017729 NASA Dryden Flight Rese
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and operated in a proximity of the
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for anorthosite. The DTA (Fig 1a) i
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systematics, and discuss these ages
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solar flares, but for convenience a
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Very high dose (red) is deposited i
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FAA Aerospace Forecast, Fiscal Year
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MER Surface Phase; Blurring the Lin
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BIOSPHERE Spheres of Earth: An Intr
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Atmospheric Radiation Measurement P
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SPRUCE: Systems and Software Produc
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Coal Combustion Waste Impoundment D
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DOCUMENT MARKUP LANGUAGES Journal o
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ELECTRON TRANSFER Single Molecule S
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Thermal Modeling and Feedback Requi
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GEOCHRONOLOGY Mapping Tyrrhena Pate
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Summary of the Updated Regulatory I
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IN SITU MEASUREMENT Miniaturized En
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LARGE SCALE INTEGRATION Large-Scale
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MAGNETOPLASMADYNAMIC THRUST- ERS Ev
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METHANE Regulation of Methane Genes
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NITROGEN Development of Designer Di
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PEBBLE BED REACTORS Nuclear Safegua
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Polymerization method for formation
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QUANTUM WELL LASERS High-Efficiency
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RESIDUES A Parameterization of Posi
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Nondestructive Evaluation Methods f
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SPACECRAFT MOTION Instrument Pointi
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Nuclear Hydrogen Initiative, Result
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THERMAL PROTECTION Design and Analy
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VIRULENCE Infectious Disease Risk A
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Aalseth, Craig E P-Type Point Conta
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Bird, L. Carbon Taxes: A Review of
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Chen, Lilia Health Hazard Evaluatio
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Peak Performance Through Nutrition
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Fox, K. M. Atmospheric Ention of Mo
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Hammond, Monica Robotic Lunar Lande
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Initial Study Comparing the Radiati
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Ko, Jinseok Design of a New Optical
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Little, Leslie E. Engineering Evalu
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Melton, Shannon On-Orbit Prospectiv
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Papanicolaou, T. Autonomous Measure
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Rickman, Doug Thermal Properties of
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Seifried, Jeffrey E. Thermal Modeli
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Stoeser, D. NASA Lunar Regolith Sim
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Wang, Shuying Post-Cyclic Behavior
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