| The Effects of a Novel Head-Mounted Symbology on Spatial Disorientation and Flight Performance in U.S. Air Force Pilots |
24 Oct 2012 |
15 pages |
| Authors:
Fred H Previc; Nathan A Dillon; Rick H Evans; Ryan Maresh; William R Ercoline; Joseph Fischer; SCHOOL OF AEROSPACE MEDICINE WRIGHT PATTERSON AFB OH
|
 | Spatial disorientation (SD) has accounted for about 25% of all Class A mishaps in the U.S. Air Force over the past several decades, with over 40% of fatal mishaps attributed to SD. One way to counter SD is by improving attitude awareness (pitch and roll) and overall spatial orientation through improved primary flight displays. One such display, the X-Motion Device(Trademark) (XMD), is a see-through device resembling standard eyewear but with ... |
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| Who has Legal Sovereignty Over Jerusalem and which Peace Proposal has the Best Chance of Resolving the Dispute over this Symbolic Land? |
Jun 2012 |
87 pages |
| Authors:
Daxton H Moore; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| There are four schools of thought as to who has legal sovereignty over Jerusalem, and this is one of the primary reasons why there has been no resolution to the problem. The first is that there was a vacuum of sovereignty in the wake of British withdrawal, which was filled by Israel after the first Arab-Israeli War and again as a need for selfdefense after the 1967 War; the second ... |
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| Improving Systematic Constraint-driven Analysis Using Incremental and Parallel Techniques |
May 2012 |
216 pages |
| Authors:
Junaid H Siddiqui; TEXAS UNIV AT AUSTIN
|
| This dissertation introduces Pikse, a novel methodology for more effective and efficient checking of code conformance to specifications using parallel and incremental techniques, describes a prototype implementation that embodies the methodology, and presents experiments that demonstrate its efficacy. Pikse has at its foundation a well-studied approach - systematic constraint-driven analysis - that has two common forms: (1) constraint-based testing - where logical constraints that define desired inputs and expected program ... |
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| An All-Fragments Grammar for Simple and Accurate Parsing |
21 Mar 2012 |
22 pages |
| Authors:
Mohit Bansal; Daniel Klein; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| We present a simple but accurate parser which exploits both large tree fragments and symbol refinement. We parse with all fragments of the training set, in contrast to much recent work on tree selection in data-oriented parsing and tree-substitution grammar learning. We require only simple, deterministic grammar symbol refinement, in contrast to recent work on latent symbol refinement. Moreover, our parser requires no explicit lexicon machinery, instead parsing input sentences ... |
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| The Significance of Fire Service Culture as an Impediment to Effective Leadership in the Homeland Security Environment |
Mar 2012 |
155 pages |
| Authors:
Alan T Cox; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF NATIONAL SECURITY AFFAIRS
|
| The tragic loss of 343 firefighters on 9/11 monumentally illustrates that firefighters now stand on the front line in the war against terrorism. The ramifications of 9/11 forced fire service leaders to incorporate newly recognized strategies of terrorism management and mitigation into traditional firefighting roles. Blue-collared manual laborers are no longer the archetype of modern firefighters. Instead, firefighters now command with an expanded leadership role within society and the desire ... |
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| Rotary-Wing Brownout Mitigation: Technologies and Training (Remedes contre le phenomene de brownout sur les appareils a voilure tournante: Technologies et entrainement) |
Jan 2012 |
182 pages |
| Authors:
NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)
|
| The RTO HFM-162 Rotary-Wing Brownout Mitigation Task Group was formed to examine the effects of Rotary-Wing Brownout (RWB) and whiteout on pilots during operations. Brownout is the condition developed by recirculating rotor downwash as a helicopter lands or takes off in an arid or a snowy (whiteout) environment. The dust, dirt, or snow that is developed by the downwash renders out-the-cockpit visibility severely degraded or non-existent. The resultant mishaps due ... |
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| Detection of Common Warfighting Symbology (MIL-STD-2525) Air Symbols |
Sep 2011 |
22 pages |
| Authors:
Kingsley Fletcher; Ashley Arnold; Susan Cockshell; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
|
| The Common Warfighting Symbology Standard Bravo version (MIL-STD-2525B) is a contractual requirement for a number of Australian defence projects. To evaluate how well MIL-STD-2525B supports rapid and accurate detection of symbols in clutter the current study examined the speed and accuracy with which 23 participants could detect the presence of each MIL-STD-2525B air affiliation symbol when symbol overlap and icon presence were manipulated. Detection efficiency and accuracy were significantly lower ... |
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| Enhancing Simulation-Based Training Adversary Tactics via Evolution (ESTATE) |
15 DEC 2010 |
11 pages |
| Authors:
Brad Rosenberg; CHARLES RIVER ANALYTICS INC CAMBRIDGE MA
|
| During the current reporting period, we presented ESTATE at the two-day ONR 341 Program Review for Harold Hawkins on 4-5 October 2010. The review included program presentations from ONR-funded performers on human cognitive performance predictors such as neural plasticity, working memory, and adaptive performance as well as population modeling and computational approaches for 21st Century Naval Operations. Interactions with the review participants helped us to consider future directions for the ... |
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| Grid-Enabled Quantitative Analysis of Breast Cancer |
Oct 2009 |
51 pages |
| Authors:
Andrew R Jamieson; Maryellen L Giger; Karen Drukker; Lorenzo Pesce; Hui Li; Neha Bhooshan; Yading Yuan; CHICAGO UNIV IL
|
| The long-term goal of this research is to improve breast cancer diagnosis, risk assessment, response assessment, and patient care via the use of large-scale, multi-modality computerized image analysis. The central hypothesis of this research is that large-scale image analysis for breast cancer research will yield improved accuracy and reliability when optimized over multiple features and large multi-modality databases. We designed and executed a pilot study to utilize large scale parallel ... |
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| Performance Analysis of a Link-16/JTIDS Compatible Waveform With Noncoherent Detection, Diversity and Side Information |
Sep-2009 |
70 pages |
| Authors:
Ioannis Kagioglidis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Joint Tactical Information Distribution System (JTIDS) is a hybrid frequency-hopped, direct sequence spread spectrum system. A (31, 15) Reed-Solomon (RS) code is used for forward error correction coding, and cyclical code-shift keying (CCSK) M-ary modulation is used, where each encoded symbol represents five bits. In this thesis, a compatible waveform consistent with the existing JTIDS channel waveform is analyzed. The system considered uses the same (31, 15) RS encoding ... |
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| Joint Command Decision Support 21st Century Technology Demonstration: Human Factors Style Guide |
Mar-2009 |
168 pages |
| Authors:
CAE PROFESSIONAL SERVICES OTTAWA (ONTARIO)
|
| The aim of the Joint Command Decision Support for the 21st Century Technology Demonstrator Project (JCDS 21 TDP) is to demonstrate a Joint Net-enabled, Collaborative Environment to achieve Decision Superiority at the strategic and operational levels of command. JCDS 21 applications are intended for short-duration, domestic operations that may require military and civil responders to work together to resolve the impact of natural or man-made incidents. This document is intended ... |
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| Performance Analysis of an Alternative Link-16/JTIDS Waveform Transmitted Over a Channel with Pulse-Noise Interference |
Dec-2008 |
66 pages |
| Authors:
Ho K Wei; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Joint Tactical Information Distribution System (JTIDS) is a hybrid frequency-hopped direct sequence spread spectrum system that utilizes a (31, 15) Reed- Solomon (RS) code and cyclical code-shift keying modulation for the data packets, where each encoded symbol consists of five bits. The primary drawback to JTIDS is the limited data rate. In this thesis, an alternative waveform consistent with the existing JTIDS waveform but with twice the data rate ... |
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| Performance Analysis of a JTIDS/Link-16-type Waveform Transmitted over Slow, Flat Nakagami Fading Channels in the Presence of Narrowband Interference |
Dec-2008 |
208 pages |
| Authors:
Chi-Han Kao; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Link-16 is a tactical data link. It provides presumably secure and jam-resistant tactical information for land, sea, and air platforms. The communication terminal of Link-16 is called Joint Tactical Information Distribution System (JTIDS) and features Reed-Solomon (RS) coding, symbol interleaving, cyclic code-shift keying (CCSK) for M-ary symbol modulation, minimum-shift keying (MSK) for chip modulation, and combined frequency-hopping and direct sequence spread spectrum for transmission security. In this dissertation, the performance ... |
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| Deconstructing Spatiotemporal Chaos Using Local Symbolic Dynamics |
Dec-2008 |
6 pages |
| Authors:
Shawn D Pethel; Ned J Corron; ARMY AVIATION AND MISSILE RESEARCH DEVELOPMENT ENG CTR REDSTONE ARSENAL AL
|
| We find that the global symbolic dynamics of a diffusively coupled map lattice (CML) is well approximated by a very small local model for weak to moderate coupling strengths. A local symbolic model is a truncation of the full symbolic model to one that considers only a single element and a few neighbors. Using interval analysis we give rigorous results for a range of coupling strengths and different local model ... |
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| Performance Analysis of a Link-16/JTIDS Compatible Waveform Transmitted Over a Channel with Pulse-Noise Interference |
01-Sep-2008 |
110 pages |
| Authors:
Dimitrios Lekkakos; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Joint Tactical Information Distribution System (JTIDS) is a hybrid frequency-hoped, direct sequence spread spectrum system that utilizes a (31, 15) Reed-Solomon (RS) code and cyclical code-shift keying (CCSK) modulation for the data packets, where each encoded symbol consists of five bits. In this thesis, an alternative waveform consistent with the existing JTIDS channel waveform is analyzed. The system to be considered uses (31, 15) RS encoding as the original ... |
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| A Study of Connectivity in MIMO Fadinc Ad-Hoc Networks |
04-Aug-2008 |
13 pages |
| Authors:
H Yousefizadeh; H Jafarkhani; J Dazemitabar; CALIFORNIA UNIV IRVINE CENTER FOR PERVASIVE COMMUNICATIONS AND COMPUTING
|
| We investigate the connectivity of fading wireless ad-hoc networks with a pair of novel connectivity metrics. Our first metric looks at the problem of connectivity relying on the outage capacity of MIMO channels. Our second metric relies on a probabilistic treatment of the symbol error rates for such channels. We relate both capacity and symbol error rates to the characteristics of the underlying communication system such as antenna configuration, modulation, ... |
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| Toolkit for Tactical Visualizations that Represent Uncertainty Dynamically |
01-Apr-2008 |
50 pages |
| Authors:
Xinyu Zhang; Celestine A Ntuen; NORTH CAROLINA AGRICULTURAL AND TECHNICAL STATE UNIV GREENSBORO
|
| Decisions are usually made under uncertainty, so displaying uncertainty information is very important to decision-making. In the past, uncertainty information associated with tactical symbols was ignored. Recent research explored uncertainty display techniques and investigated the capabilities of the human perceptual system. However, most previous studies focused on static display, and limited techniques. In this report, we investigated dynamic display of uncertainty information of tactical symbols. A comparison study was carried ... |
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| AI and Mental Imagery |
01-Jan-2008 |
3 pages |
| Authors:
Samuel Wintermute; Scott D Lathrop; MILITARY ACADEMY WEST POINT NY
|
| Vision and space are prominent modalities in our experiences as humans. We live in a richly visual world, and are constantly and acutely aware of our position in space and our surroundings. In contrast to this seemingly precise awareness, we are also able to reason abstractly, use language, and construct arbitrary hypothetical scenarios In this position paper, we present an AI system we are building to work towards human capability ... |
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| Evaluation of Symbol Sets for Naval Tactical Displays |
JAN 2008 |
80 pages |
| Authors:
Sharon M. McFadden; Jennifer Jeon; Annie Li; Annalisa Minniti; HUMANSYSTEMS INC GUELPH (ONTARIO)
|
| The four experiments reported in this paper were conducted in support of the COMmand Decision Aiding Technology (COMDAT) (11bg) Technology Demonstrator Project (TDP) and the Halifax Class Modernization Command and Control System (HMCCS) programme. The first experiment assessed the relative visibility of the basic Naval Tactical Data System (NTDS) and MIL-STD-2525B (2525B) tactical symbols. Performance with the colour-coded versions of the two symbol sets was not significantly different. However, the ... |
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| Navigation Using Orthogonal Frequency Division Multiplexed Signals of Opportunity |
SEP 2007 |
87 pages |
| Authors:
Jamie S. Velotta; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The global positioning system (GPS) provides high-accuracy position measurements anywhere in the world. However, a limitation of this system is that a line of sight to multiple satellites is required; therefore, it is unsuitable to use indoors or in urban canyons. Also, in the presence of radio-frequency interference or jamming, GPS may be unavailable. Alternative methods of navigation and positioning are need to either compliment GPS as a backup or ... |
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| Wavelet Approach to Data Analysis, Manipulation, Compression, and Communication |
07 AUG 2007 |
16 pages |
| Authors:
Charles K. Chui; MISSOURI UNIV-ST LOUIS
|
| The main objective of our research program over the past three-year period is three-fold: firstly, mathematical theories and methods, as well as construction of basis functions, for multi-level approximation and analysis, with emphasis on scattered data interpolation and representation, were developed; secondly, based on minimum-energy criteria, new data processing tools, particularly variational algorithms and optimal wavelet thresholding methods, with applications to image restoration, were introduced; and finally, these developments were ... |
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| Long-Term Symbolic Learning |
2007 |
36 pages |
| Authors:
William G. Kennedy; J. G. Trafton; NAVAL RESEARCH LAB WASHINGTON DC
|
| What are the characteristics of long-term learning? We investigated the characteristics of long-term, symbolic learning using the Soar and ACT-R cognitive architectures running cognitive models of two simple tasks. Long sequences of problems were run collecting data to answer fundamental questions about long-term, symbolic learning. We examined whether symbolic learning continues indefinitely, how the learned knowledge is used and whether computational performance degrades over the long term. We report three ... |
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| Helmet-Mounted Display Computer Model and Research Visualization Tool |
NOV 2006 |
9 pages |
| Authors:
T. H. HARDING; J. S. Martin; C. E. Rash; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| As the Army increases its reliance upon helmet mounted displays (HMDs) or head-up displays (HUDs), it is paramount that displays are developed that meet the operational needs of the warfighter. During the development cycle, questions always arise concerning the operational requirements of the HMD. These include questions concerning luminance, contrast, color and resolution. To provide intelligent answers to these operational questions, a method has been devised to evaluate these issues. ... |
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| Phenomenology-Based Inverse Scattering for Sensor Information Fusion |
15 SEP 2006 |
34 pages |
| Authors:
Kung-Hau Ding; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE
|
| Fusion of sensor and communication data currently can only be performed at a late processing stage after sensor and textual information are formulated as logical statements at appropriately high level of abstraction. Contrary to this it seems, the human mind integrates sensor and language signals seamlessly, before signals are understood, at preconceptual level. Learning of conceptual contents of the surrounding world depends on language and vice versa. This paper uses ... |
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| A Compendium on Glyph/Icon Research Including MIL 2525B |
SEP 2006 |
50 pages |
| Authors:
D. W. Repperger; G. Kuperman; G. Thomas-Meyers; D. Aleva; S. Fullenkamp; GENERAL DYNAMICS ADVANCED INFORMATION ENGINEERING SERVICES INC DAYTON OH
|
| An overview is conducted on the vast area of visualization when applied to icons and their application is map-type displays. The early history and motivation of the use of icons is examined. Displaying complex information is surveyed in multiple areas. The possible use of animation is both researched and hypothesized for application in military scenarios. The genesis of the military standard MIL2525B is discussed. Suggestions are made on means of ... |
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| Sensor Ontology Integration for the Knowledge Management for Distributed-Tracking (KMDT) Program |
JUN 2006 |
41 pages |
| Authors:
Marion G. Ceruti; Dwight R. Wilcox; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| This paper describes Knowledge Management for Distributed-Tracking (KMDT), which is an ongoing research and development project to explore methods to improve military functions in the battle space, such as command, control, and decision support. It features a hypothetical use-case scenario that shows how knowledge-management technologies, such as ontologies and intelligent agents, can be used to improve battle-space awareness and the decision-making process in command centers with respect to distributed tracking ... |
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| The Identification of War-Fighting Symbology With the Use of a Small Display |
MAY 2006 |
30 pages |
| Authors:
Kimberty Myles; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD HUMAN RESEARCH AND ENGINEERING DIRECTORATE
|
| Two studies were conducted to evaluate the effects of symbol size and screen clutter on symbol identification when one is using a small map display. The purpose of the first study was to determine the minimum threshold symbol size for a group of selected war-fighting symbols that could be discriminated and identified on a 3.5-inch simulated wrist map display. The Best PEST (Parameter Estimation by Sequential Testing) psychophysical adaptive procedure ... |
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| Bandwidth Efficient Pilot Assisted Transmission Over Double-Selective Wireless Fading Channels Using Superimposed Training |
MAY 2006 |
18 pages |
| Authors:
Mounir Ghogho; LEEDS UNIV (UNITED KINGDOM)
|
| We propose to estimate time-varying frequency-selective channels using data-dependent super- imposed training (DDST) and a basis expansion model (BEM). The superimposed training consists of the sum of a known sequence and a data-dependent sequence, which is unknown to the receiver. The data-dependent sequence cancels the effects of the unknown data on channel estimation. Symbol detection is performed using MMSE equalization. The method is compared to time-division-multiplexing-based methods. |
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| BotXminer: Mining Biomedical Literature with a New Web-Based Application |
21 MAR 2006 |
6 pages |
| Authors:
Uma Mudunuri; Robert Stephens; David Bruining; David Liu; Frank J. Lebeda; NATIONAL CANCER INST FREDERICK MD
|
| This paper outlines botXminer, a publicly available application to search XML-formatted MEDLINE data in a complete, object-relational schema implemented in Oracle XML DB. An advantage offered by botXminer is that it can generate quantitative results with certain queries that are not feasible through the Entrez-PubMed interface. After retrieving citations associated with user-supplied search terms, MEDLINE fields (title, abstract, journal, MeSH and chemical) and terms (MeSH qualifiers and descriptors, keywords, author, ... |
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| Flare Cue Symbology for Zero-Zero Weather Landings |
MAR 2006 |
13 pages |
| Authors:
Guy A. French; David M. Murphy; William R. Ercoline; GENERAL DYNAMICS ADVANCED INFORMATION ENGINEERING SERVICES INC DAYTON OH
|
| When flying an airplane, landing is arguably the most difficult task a pilot can do. This applies to pilots of all skill levels particularly as the level of complexity in both the aircraft and environment increase. Current navigational aids, such as an instrument landing system (ILS), do a good job of providing safe guidance for an approach to an airfield. These aids provide data to primary flight reference (PFR) displays ... |
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| Activity-Local Symbolic State Graph Generation for High-Level Stochastic Models |
SEP 2005 |
30 pages |
| Authors:
KAI LAMPKA; MARKUS SIEGLE; UNIVERSITAET DER BUNDESWEHR MUENCHEN NEUBIBERG (GERMANY F R) FAKULTAET FUER INFORMATIK
|
| We introduce a new, efficient method for constructing compact symbolic representations of very large stochastic labelled transition systems. Contrary to known symbolic state space generation techniques, our technique is applicable to general high-level models which do not have to possess any particular structure. The method is based on zero-suppressed binary decision diagrams which we extended to the multi- terminal case. The symbolic representation is obtained by evaluating the semantics of ... |
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| Simulation of Quantum Time-Frequency Transform Algorithms |
20 JUN 2005 |
16 pages |
| Authors:
Chao Lu; TOWSON UNIV MD
|
| The demand for exact computation in scientific fields related to quantum physics is not met by the Symbolic Math Toolbox developed in MATLAB. In particular, exact evaluation rational multiples of 2 square is at the heart of efficient implementation of quantum time-frequency transforms. Computations performed using this Toolbox generate erroneous results when used with numbers with more than twenty digits in length. Furthermore, the results of our investigation lead us ... |
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| The Role of the Ulama in Shiite Social Movements: Bahrain, Lebanon, and Iraq |
JUN 2005 |
101 pages |
| Authors:
Brian P. Maynard; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Shiite "ulama" have become politically active in past decades, beginning in the 1960s-1970s with the articulation of the new ideology that empowered the Iranian Revolution. Though a significant portion of the ulama retained their quietist tradition, enough felt motivated by "wilayet e-faqih" to become a major force on the political landscape. The ulama were particularly well suited to lead a successful social movement. Shiite tradition and symbology, once released ... |
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| 3-D Audio: Military Applications and Symbology |
01 APR 2005 |
11 pages |
| Authors:
Mark A. Ericson; Brian D. Simpson; Richard L. McKinley; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| Five experiments were conducted to study the acoustic attributes that enable the accurate identification and localization of rudimentary spatial warning sounds. In each experiment, two sounds were played simultaneously over loudspeakers at various azimuths and elevations. The stimuli consisted of pure tone complexes with a 13 kHz bandwidth. The fundamental frequencies, the amplitude modulation rate of the complex, the harmonicity of the carrier and modulation frequencies, and the coherence of ... |
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| A High-Level Symbolic Representation for Intelligent Agents Across Multiple Architectures |
JUL 2004 |
186 pages |
| Authors:
Jacob Crossman; Robert Wray; Paul Nielson; Randolph M. Jones; Al Wallace; Christian Lebiere; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| This report describes the High-bevel Symbolic Representation (HLSR) project for the U.S. Air Force PRDA 03-01-HE: Human Performance in Modeling and Simulation, Technical Area 2: Opposing Force Behaviors. This report summarizes the work done on Defense Modeling Simulation contract F33615-03-C-6343 to develop a high level symbolic representation (HLSR) for behavior modeling. This effort seeks to increase development efficiency and reuse in behavior modeling. The report describes the development of a ... |
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| Improving Individual and Team Decisions Using Iconic Abstractions of Subjective Knowledge (Briefing Charts) |
JUN 2004 |
36 pages |
| Authors:
Robert A. Fleming; Michael B. Cowen; SPACE AND NAVAL WARFARE SYSTEMS COMMAND SAN DIEGO CA
|
| Research has shown that in a group decision making environment, members usually discount any uniquely held information that gets shared with the group. We hypothesize this is so because: (1) A group member already has a high cognitive burden in processing the information he has found. (2) Shared information from other members usually arrives in an unprocessed form. (3) The new information is not integrated into the decision process because ... |
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| Synchronization Analysis and Simulation of a Standard IEEE 802.11G OFDM Signal |
MAR 2004 |
176 pages |
| Authors:
Keith D. Lowham; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Synchronization of orthogonal frequency-division multiplexed (OFDM) signals is significantly more difficult than synchronization of a single-carrier system. The recently approved IEEE Standard 802,1 ig specifies a packet-based OFDM system that provides a basis for the discussion of OFDM synchronization in a packet-based enviwnment. Algorithms that synchronize the receiver can'ier demodulation frequency and phase, the data flame, the OFDM symbol timing, and the data symbol timing are discussed and analyzed in ... |
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| Interference Suppression in Multiple Access Communications Using M-Ary Phase Shift Keying Generated via Spectral Encoding |
MAR 2004 |
127 pages |
| Authors:
Abel S. Nunez; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| A conceptual transform domain communication system (TDCS) is shown capable of operating successfully using M-Ary phase shift keying (MPSK) data modulation in a multiple access environment. Using spectral encoding, the conceptual TDCS provides an effective means for mitigating interference affects while achieving multiple access communications. The use of transform domain processing with MPSK data modulation (TD-MPSK) provides higher spectral efficiency relative to other modulation techniques (antipodal signaling and cyclic shift ... |
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| The Case for Using Semantic Nets as a Convergence Format for Symbolic Information Fusion |
MAR 2004 |
|
| Authors:
Jean Rohmer; THALES COMMUNICATIONS COLOMBES (FRANCE)
|
 | People have to deal with an impressive continuum of representations, from fully numeric and structured to totally textual and unstructured. Solving this situation of heterogeneity is a prerequisite to information fusion processes and algorithms. However, in the human brain, the distinction between structured and unstructured data simply does not exist. Humans are easily able to merge information coming from heterogeneous sources. How can computers mimic this extraordinary capability? The solution ... |
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| A SAT-Based Algorithm for Reparameterization in Symbolic Simulation |
03 DEC 2003 |
|
| Authors:
Pankaj Chauhan; Daniel Kroening; Edmund Clarke; CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE
|
| Parametric representations used for symbolic simulation of circuits usually use BDDs. After a few steps of symbolic simulation, state set representation is converted from one parametric representation to another smaller representation, in a process called reparameterization. For large circuits, the reparametrization step often results in a blowup of BDDs and is expensive due to a large number of quantifications of input variables involved. Efficient SAT solvers have been applied successfully ... |
|
| Integration of Language and Cognition at Pre-Conceptual Level |
04 OCT 2003 |
6 pages |
| Authors:
Leonid I. Perlovsky; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| This paper discusses mathematical models of the mechanisms that the mind can use for combining language and cognition. I address the problem of concurrent language acquisition and conceptual learning. How can a child learn so fast? In concurrent learning of language and cognitive structures, language helps learning about objects in the surrounding world and vice versa, which might explain why we can learn to recognize objects and words, but cannot ... |
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| A Limited Evaluation of Off-Boresight Flight Reference Symbologies for Fixed Wing Aircraft Helmet-Mounted Displays |
JUN 2003 |
88 pages |
| Authors:
Donald G. Sheesley; Thomas A. Holler; Stephen P. McIlvaine; Frederick C. Bivetto; C. T. Owens; AIR FORCE FLIGHT TEST CENTER EDWARDS AFB CA
|
| This report presents the results of Project Have SYCLOPS, a limited evaluation of off-boresight flight reference symbologies for fixed wing helmet- mounted displays (HMDs). The overall objective was to compare three HMD flight reference displays containing own- ship status information as aids during operationally representative, off-boresight, air-to-air and air-to-ground piloting tasks. The three symbologies were the Baseline (BL), Baseline Plus (BL+) and Advanced Non-Distributed Flight Reference (ANDFR). The Air Force ... |
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| Information Exchange and Display in Asynchronous C2 Group Decision Making |
JUN 2003 |
38 pages |
| Authors:
Robert A. Fleming; SPACE AND NAVAL WARFARE SYSTEMS COMMAND SAN DIEGO CA
|
| Research has indicated that group decision making participants have difficulty in sharing their uniquely held information and in integrating unique information from other participants. An on-line knowledge elicitation technique is proposed where participants assign a variety of cognitive assessments to each retained decision-relevant information item. These assessments might include source credibility, timeliness, information uncertainty, direction of impact on the related decision criterion as well as overall importance of the information ... |
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| Sensible Agents: Augmenting and Empowering Human Decision-Makers |
14 MAY 2003 |
|
| Authors:
K. S. Barber; Anuj Goel; Joonoo Kim; Cheryl E. Martin; David C. Han; TEXAS UNIV AUSTIN LAB FOR INTELLIGENT PROCESSES AND SYSTEMS
|
| The development of computer systems that interact with human operators requires an intelligent mechanism for defining their relationship(s). This research demonstrates a computer augmented cognition framework characterized as human-machine symbiosis. The responsibilities of the computing system are elevated from mere information sources to those of an entity that can form complex relationships with the appropriate humans. Specifically the research addresses the augmentation of human decision-making providing software agents to augment ... |
|
| Nation-Building, The American Way |
07 APR 2003 |
40 pages |
| Authors:
Jayne A. Carson; ARMY WAR COLL CARLISLE BARRACKS PA
|
| The United States has conducted nation-building operations since 1898 and does so in a uniquely American way. Nation-building is the intervention in the affairs of a nation-state for the purpose of changing the state's method of government and when the United States pursues these efforts there is one goal - democratization. Removing existing governments requires force, and history has shown that the Army is the force of choice. The story ... |
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| The Human Dimension of Battlespace Visualization: Research and Design Issues |
FEB 2003 |
39 pages |
| Authors:
Michael J. Barnes; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The purpose of the report was to explore the human dimension of battlefield visualization in order to generate design principles and suggest future research topics. The author reviewed cognitive engineering research sponsored by the U.S. Army Research Laboratory, other military related research, and pertinent open literature publications. A descriptive model of visualization is discussed in terms of the ability of the commander to understand the current combat situation, generate courses ... |
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| Effects of Spatial Disorientation on Cognitive Functions |
FEB 2003 |
3 pages |
| Authors:
Ahmet Sen; Kaan Yilmaz; H. F. Tore; TURKISH AEROMEDICAL CENTER ANKARA
|
| Spatial Disorientation is well known by fliers but, generally it is too difficult to overcome. Even if it is managed, a pilot might still be at risk of serious dangers. After simulating Spatial Disorientation in laboratory conditions, any impairment of cognitive functions of the pilots was examined in order to find out whether Spatial Disorientation has any negative effect on cognitive functions. Two groups of, totally 82 pilot candidates who ... |
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| The Effects of Helmet-Mounted Display Symbology on the Opto-Kinetic Cervical Reflex and Frame of Reference |
FEB 2003 |
11 pages |
| Authors:
Kristen K. Liggett; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
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| Spatial disorientation (SD) accidents are a major contributor to the Class A mishap rate in the US Air Force. A recent investigation showed that transitions between visual meteorological conditions (VMC), when pilots use real-world visual cues to fly, to instrument meteorological conditions (IMC), when pilots have to use instruments to fly, were a leading cause of SD. In VMC, the true horizon is the primary visual cue pilots use to ... |
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| Glossary and Catalog of MeT Data Representation |
FEB 2003 |
13 pages |
| Authors:
Edward Measure; ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM
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| The present short report is intended to catalog the major digital formats in wide use for representing meteorological data. Each data format discussed is briefly defined, and references are given to more detailed discussions of the format. The author intends to follow this report with another that discusses the most important formats used for satellite data in considerably greater detail. No claim is made that the list of formats given ... |
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| Joint Detection and Decoding of High-Order Modulation Schemes for CDMA and OFDM Wireless Communicaitons |
2003 |
200 pages |
| Authors:
Yingjiu Xu; MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| Wireless communications call for high data rate, power and bandwidth efficient transmissions. High-order modulation schemes are suitable candidates for this purpose as the potential to reduce the symbol period is often limited by the multipath-induced intersymbol interference. In order to reduce the power consumption, and at the same time, to estimate time-variant wireless channels, we propose low-complexity, joint detection and decoding schemes for high-order modulation signals in this dissertation. We ... |
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