| General Coverage Problems with Applications, and Bootstrap Method in Survival Analysis and Reliability Theory |
08 JAN 98 |
9 pages |
| Authors:
Shaw-Hwa Lo; COLUMBIA UNIV NEW YORK
|
 | By approximating the classical Product-Limit estimator of a distribution function with an average of lid random variables, we derive, for the first time in the literature, sufficient and necessary conditions for the rates of (both strong as well as weak laws) uniform convergence of the Product- Limit estimator over the whole line. These findings somehow fill a longstanding gap in the theory of Survival Analysis and provide a systematic tool ... |
|
| Fourth Quarterly Monitoring Report for the Former Fire Training Area Deliverable 2B |
JAN 1998 |
28 pages |
| Authors:
OGDEN ENVIRONMENTAL AND ENERGY SERVICESLOUISVILLE KY
|
| The Installation Restoration Program was initiated by the Air National Guard (ANG) to evaluate potential contamination to the environment caused by past practices at its installations. The Preliminary Assessment (PA) identified the location of a former Fire Training Area (FTA). Closure activities in Aug 1995 included placement of a cap. State regulations in this karst area require 30 years of monitoring of the surface water at a nearby spring. This ... |
|
| Seismic Velocity, Stratigraphy and Acoustic Study of the South China Sea |
1998 |
|
| Authors:
Peter D. Clift; Jian Lin; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF GEOLOGY AND GEOPHYSICS
|
 | A study was performed of the seismic velocity structure of the South China Shelf from the westernmost parts of the Beibu Gulf, adjacent to the Gulf of Tonkin, south of Hainan Island and offshore southern mainland China, as far east as 118 deg east. Stacking velocities from petroleum industry multichannel seismic surveys were compiled into a database from which the depth or two way travel ... |
|
| Proposals for Updating Tai Algorithm |
Dec-1997 |
13 pages |
| Authors:
C Thomas; J Azoubib; BUREAU INTERNATIONAL DES POIDS ET MESURES SEVRES (FRANCE)
|
| The conditions of computation of TAI and UTC are in constant evolution. The replacement of clocks of older design by new ones of type HP 5071A, started in 1993, continues with consequent improvement in the stability of the free atomic time scale EAL, the first step in the calculation of TAI. To further improve the stability of EAL and to further reduce the delay of access to TAI and UTC, ... |
|
| New Approximation Techniques for Some Ordering Problems |
25 SEP 97 |
|
| Authors:
Satish Rao; Andrea W. Richa; CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE
|
| We describe O(log n) times optimal approximation algorithms for the NP-hard graph optimization problems of minimum linear arrangement, minimum containing interval graph and minimum storage-time product. This improves on the O(log n log log n) approximation bounds provided in a previous paper by Even, Naor, Scheiber and Rao. Our techniques are based on using spreading metrics (as in Even Naor Rao, and Scheiber) to define a cost estimate for a ... |
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| Conservative Delta Hedging |
SEP 97 |
32 pages |
| Authors:
Per A. Mykland; CHICAGO UNIV IL
|
| It is common to have interval predictions for volatilities and other quantities governing securities prices. The purpose of this paper is to provide an exact method for converting such intervals into arbitrage based prices of financial derivatives or industrial or contractual options. We call this procedure conservative delta hedging. As existing procedures are of an ad hoc nature, the proposed approach will permit an institution's man agement a greater oversight ... |
|
| Reliability Estimation Based Upon Test Plan Results |
AUG 97 |
29 pages |
| Authors:
Robert R. Read; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OPERATIONS RESEARCH
|
| The report contains a brief summary of aspects of the Maximus reliability point and interval estimation technique as it has been applied to the reliability of a device whose surveillance tests contain a succession of stressful environments. The lower confidence limits appear to be ultra conservative. It is argued that the serial system approach to modeling of the cumulative effect of the stresses is inappropriate. Some alternative modeling is suggested. ... |
|
| Michigan Breast Reconstruction Outcomes Study |
JUL 97 |
52 pages |
| Authors:
Edwin G. Wilkins; MICHIGAN UNIV ANN ARBOR
|
| The objective of the study is to compare the long term outcomes of the most common techniques of post- mastectomy breast reconstruction: tissue expansion/breast implants, transverse rectus abdominis musculocutaneous (TRAM) flaps (free and pedicle), and Latissimus Dorsi flaps. This four year prospective study will adapt existing instruments and formulate new methodologies to assess outcomes in five categories: complication rates, aesthetic results, functional results, psychosocial status and costs. Study results will ... |
|
| Analysis of a Soft Real-Time Random Access Protocol |
MAR 97 |
30 pages |
| Authors:
Michael J. Markowski; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A communications network that is part of a soft real time system will need to transmit messages within a bounded delay, but may allow some messages to miss this bound and be dropped within a maximum prespecified rate of message loss. This paper presents a media access protocol for soft real time systems implemented on a slotted radio channel with binary feedback. The protocol is based on the Gallager FCFS ... |
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| Critical Examination of C-130 Programmed Depot Maintenance (PDM) induction Methodology: Determining PDM Intervals |
MAR 1997 |
36 pages |
| Authors:
John A. Daniels; AIR UNIV MAXWELL AFB AL
|
| The current USAF process for establishing intervals between C-130 PDM does not account for the wide range of aircraft variables within each aircraft MDS. This paper develops a model, based on five unique aircraft variables, to provide C-130 maintainers with a prediction tool to forecast when a C-130 aircraft requires PDM. These five variables include: aircraft age, total flying hours, average yearly flying hours, mission profile (expressed as a severity ... |
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| Modeling and Simulation for Air Defense Force Allocation Planning |
97 |
145 pages |
| Authors:
John J. Nelson; UNIVERSITY OF CENTRAL FLORIDA ORLANDO
|
| The use of force ratios is an extremely valuable planning tool for the U.S. Army. Analysis of force ratios provides planning staffs and commanders an indication of the required combat power for successful operations. While the use of force ratios is prevalent for analyzing maneuver force allocation, little effort has been made to apply this technique to air defense operations. The initial attempt at force ratio analysis within the air ... |
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| Surfactant Enhanced Microbial Degradation of JP-8 Contaminated Soil |
DEC 96 |
108 pages |
| Authors:
John D. Thomas; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| This research effort used an automated respirometer to evaluate the enhancement of JP-8 fuel biodegradation, from surfactant addition. Two nonionic surfactants, Novell 1412-7 and Alfonic 810-4.5 were chosen for addition to contaminated JP-8, microcosms at three levels of treatment. The three levels of treatment included sub-CMC, CMC, and supra-CMC concentrations for each surfactant. The Novell II, nonionic surfactant, exhibited inhibitory characteristics, and was eliminated from the study. The focus of ... |
|
| F-111C Lower Wing Skin Bonded Composite Repair Substantiation Testing |
NOV 96 |
|
| Authors:
R. Boykett; K. Walker; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| Experimental testing was undertaken to verify a bonded composite repair to a crack in the primary structure of a F-111C aircraft of the Royal Australian Air Force. The flight safety was compromised by a crack in the lower wing skin reducing the structure residual strength below the Design Limit level. Two levels of representative specimens were designed to incorporate the complex local geometry in the lower wing skin. They were ... |
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| Facility Inreach Strategy to Promote Annual Mammography |
OCT 1996 |
47 pages |
| Authors:
Joni A. Mayer; SAN DIEGO STATE UNIV CA
|
| The primary purpose of this study is to increase annual return rates for screening mammography among asymptomatic women aged 50 and older. Specific project objectives include: (a) To develop an intervention aimed at promoting return mammogram adherence within 12-14 months following the last mammogram. The intervention will consist of an appointment reminder letter. (b) To refine and standardize a comparison reminder letter. (c) To implement and monitor the proposed interventions ... |
|
| Imaging of Moving Ground Vehicles |
SEP 96 |
128 pages |
| Authors:
A. W. Rihaczek; S. J. Hershkowitz; T. V. Duong; MARK RESOURCES INC TORRANCE CA
|
| We demonstrate the processing steps necessary for the identification of moving ground vehicles with synthetic aperture radar (SAR). The variety of targets is so large and the vehicles can behave in so many different ways that only a highly adaptive algorithm can accommodate all the different conditions, and identification requires that use be made of the complex image. The yaw/ pitch/roll/bounce/flex motion of a moving ground vehicle demands that different ... |
|
| Material Characterization of Samples from the Linchburg Mine |
SEP 96 |
77 pages |
| Authors:
J. W. Martin; TERRA TEK INC SALT LAKE CITY UT
|
| The Joint ROK U.S. R&D Program for New Underground Ammunition Storage Technologies was established in 1991 as a 5-year cooperative research effort between the United States (U.S.) and the Republic of Korea (ROK). The purpose of the program is to develop new design concepts for underground ammunition storage facilities that will significantly reduce the hazard distances and areas presently proscribed for ammunition storage sites by U.S. Department of Defence (DoD) ... |
|
| Studies for the Prevention and Treatment of Malaria, Leishmania, and Other Emerging Infectious Diseases in Brazil |
AUG 96 |
17 pages |
| Authors:
Reynaldo Dietze; FUNDACAO CECILIANO ABEL DE ALMEIDA VITORIA (BRAZIL)
|
| Advances in diagnosis and treatment of disease include understanding the behavior and susceptibilities of the vector, the parasite virus, or bacteria, and the host. Genetic studies have shown differences at the molecular level in parasites which may aid rapid diagnosis and allow prognosis limiting toxic drug therapy. Ongoing trials of toxicity and effectiveness in the first oral drug for visceral leishmaniasis WR6O26 include two cohorts where neither adequate efficacy nor ... |
|
| Performance Evaluation of a Modified Aloha Protocol for Tactical Radio Communications |
AUG 96 |
29 pages |
| Authors:
Michael J. Markowski; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A performance evaluation of a modified Aloha protocol for the MAC layer is presented. The modifications are that frames are not constrained to be fixed length, and frames are assigned a waiting time for their first attempt rather than only after collisions. Equations are derived that predict the throughput and average delay for a finite user systems with a Poisson arrival process. These expressions can be used in a higher ... |
|
| Acclimated Growth Rates of Mediterranean Synechoccus at Thermocline and Mixed Layer Temperatures |
JUL 96 |
3 pages |
| Authors:
A. M. Wood; F. Garcia-Pichel; C. Thiemann; M. Teiser; OREGON UNIV EUGENE
|
| Marine Synechococcus are an important component of the picoplankton in the Eastern Mediterranean. These cells are small and rod-shaped, usually about 0.8 X 1.0 micrometers in size. Because of their distinctive fluorescence characteristics, they can be distinguished from other types of phytoplankton and enumerated by epifluorescence microscopy. These cells are abundant in both the mixed layer and the thermocline of the Eastern Mediterranean, reaching maximum summertime densities of 10(exp 4) ... |
|
| Aerospace Applications of Navigation Satellites |
13 MAY 96 |
13 pages |
| Authors:
Yao Yu; Zhang Liyu; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| The United States' Navstar Global Positioning System (Navstar-GPS) and Russia's Global Navigation Satellite System (Glonass) are the new-generation global satellite radio navigation systems each developed separately in the 1970s. Their appearance fundamentally changed the concept of global navigation. The GPS satellite system is composed of a constellation of 24 satellites at an altitude of approximately 20,000 kilometers, distributed in orbits at six equivalent intervals. The orbital planes are at 55 ... |
|
| Depth and Geoacoustic Parameter Measurement in Littoral Regions Using the UQN-4A Sonar Sounding Set |
08 APR 96 |
29 pages |
| Authors:
Raymond W. Fidler; Robert D. Broome; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS FREQUENCY ACOUSTICS SECTION
|
| The data in this report demonstrates that SIMAS (Sonar In situ Mode Assessment System) can obtain current in situ bathymetric and geoacoustic information from the AN/UQN-4A Sonar Sounding Set (depth sounder) in littoral regions where vessels equipped with SIMAS systems will operate. Acoustic time series and digital depth output data were collected from the depth sounder for recording and transmission to the SIMAS system on-board the USS Curtis Wilbur (DDG-54). ... |
|
| Replicative Use of an External Model in Simulation Variance Reduction |
MAR 96 |
130 pages |
| Authors:
Thomas H. Irish; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The use of control variates is a well-known variance reduction technique for discrete event simulation experiments. Currently, internal control variates are used almost exclusively by practitioners and researchers when using control variates. The primary objective of this study is to explore the variance reduction achieved by the replicative use of an external, analytical model to generate control variates. Performance for the analytical control variates is compared to the performance of ... |
|
| Statistically Based Decompression Tables IX: Probabilistic Models of the Role of Oxygen in Human Decompression Sickness |
MAR 96 |
37 pages |
| Authors:
E. C. Parker; S. S. Survanshi; E. D. Thalmann; P. K. Weathersby; NAVAL MEDICAL RESEARCH INST BETHESDA MD
|
| While probabilistic models of human decompression sickness (DCS) have been successful in describing both the level and timing of DCS risk in a wide variety of N2-O2 data, they have failed to account for the observed DCS risk in the currently available collection of dives with significant periods of 100% oxygen breathing. The best model to date, calibrated with over 2300 air and N2- O2 dives, under-predicts the DCS risk ... |
|
| Influence of Large Volume Phlebotomy on Compensatory Tracking Performance in Rhesus Monkeys |
FEB 96 |
23 pages |
| Authors:
John W. Fanton; Dennis W. Blick; Frank R. Weathersby; Michael Cook; G. C. Brown; ARMSTRONG LAB BROOKS AFB TX OCCUPATIONAL AND ENVIRONMENTAL HEALTH DIRECTORATE
|
| In the biomedical research community, veterinarians charged with the clinical care of nonhuman primates occasionally are called upon to make judgments on the issue of blood volumes, blood sampling criteria, and the effects of phlebotomy on research results. The clinician must balance on a fine line when allowing investigators to perform either frequent small volume phlebotomies, or single large volume phlebotomies. Some large primate colonies allow 10 m1/kg of whole ... |
|
| Feasibility Study of a Rotorcraft Health and Usage Monitoring System (HUMS): Usage and Structural Life Monitoring Evaluation. Phase 2 |
FEB 96 |
68 pages |
| Authors:
B. Dickson; J. Cronkhite; S. Bielefeld; L. Killian; R. Hayden; BELL HELICOPTER TEXTRON INC FORT WORTH TX
|
| The objective of this study was to evaluate two techniques, Flight Condition Recognition (FCR) and Flight Load Synthesis (FLS), for usage monitoring and assess the potential benefits of extending the retirement intervals of life-limited components, thus reducing the operator's maintenance and replacement costs. Both techniques involve indirect determination of loads using measured flight parameters and subsequent fatigue analysis to calculate the life expended on the life-limited components. To assess the ... |
|
| Feasibility Study of a Rotorcraft Health and Usage Monitoring System (HUMS): Usage and Structural Life Monitoring Evaluation. Phase 2 |
FEB 96 |
68 pages |
| Authors:
B. Dickson; J. Cronkhite; S. Bielefeld; L. Killian; R. Hayden; BELL HELICOPTER TEXTRON INC FORT WORTH TX
|
| The objective of this study was to evaluate two techniques, Flight Condition Recognition (FCR) and Flight Load Synthesis (FIS), for usage monitoring and assess the potential benefits of extending the retirement intervals of life-limited components, thus reducing the operator's maintenance and replacement costs. Both techniques involve indirect determination of loads using measured flight parameters and subsequent fatigue analysis to calculate the life expended on the life-limited components. To assess the ... |
|
| System for Assessing Stochastic Properties of Signals Representing Three Items of Mutually Orthogonal Measurement Information. |
17 JAN 1996 |
25 pages |
| Authors:
Francis J. O'Brie Jr.; Chung T. Nguyen; Sherry E. Hammel; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A signal processing system provides and processes a digital signal, generated in response to an analog signal, which includes a noise component and possibly also an information component representing three mutually orthogonal items of measurement information representable as a sample point in a symbolic Cartesian three dimensional spatial reference system. An information processing subsystem receives said digital signal and processes it to extract the information component. A noise likelihood determination ... |
|
| Utilizing Serial Measures of Breast Cancer Risk Factors |
JAN 96 |
54 pages |
| Authors:
Mimi Y. Kim; NEW YORK UNIV MEDICAL CENTER NY
|
| Failure to account for errors-in-measurement of exposure and confounder variables can result in biased estimates of relative risk. We have developed a technique for correcting for measurement error when subjects have a variable number of repeated measurements and the average of the measurements is used as the subject's measure of exposure in the analysis. A bootstrap method for obtaining confidence intervals of the relative risk estimates, which takes into account ... |
|
| Using Time to Improve the Performance of Coordinated Checkpointing |
96 |
11 pages |
| Authors:
Nuno Neves; W. K. Fuchs; ILLINOIS UNIV AT URBANA
|
| This paper describes and evaluates a coordinated checkpoint protocol that uses time to eliminate several peformance overheads that are present in traditional protocols. The time-based protocol does not have to exchange coordination messages, does not need to add information to the processes' messages, and only accesses stable storage when checkpoints are saved. This protocol uses a simple initialization procedure to set checkpoint timers at the dlfferent processes. After the initialization, ... |
|
| Synchronous Capture of Image Sequences from Multiple Cameras |
DEC 95 |
|
| Authors:
P. J. Narayanan; Peter Rander; Takeo Kanade; CARNEGIE-MELLON UNIV PITTSBURGH PA ROBOTICS INST
|
| Several applications today need to digitally capture every frame of a video stream or a camera. These range from psychological studies to surveillance to video processing. Some applications also need to capture the fames from multiple video streams synchronously and to correlate them with one another. A video stream of color data, though, represents a sustained bandwidth of about 26 Mbytes per second from the digitizing hardware to a secondary ... |
|
| The Effect of Ageing on PBXW-115 (Aust.), PBXN-1O3 and PBXN-1O5 |
NOV 95 |
|
| Authors:
G. Bocksteiner; D. J. Whelan; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| When PBXW-115 (Aust.) is exposed to accelerated ageing according to the program set out in DEFAUST 5168: Cycle B2, mass loss (attributed to loss of plasticiser, isodecyl pelargonate) occurs, the Shore A hardness increases and the tensile properties alter somewhat. There is a link between these changes and it is probably related to the plasticiser content of the samples. From a kinetic analysis, it appears as if there may be ... |
|
| Aircraft Identification, Trajectory Tracking and Prediction |
OCT 95 |
88 pages |
| Authors:
Luis C. Cattani; Paul J. Eagle; DETROIT MERCY UNIV MI DEPT OF MECHANICAL ENGINEERING
|
| Techniques are presented for improving methods of aircraft identification and trajectory prediction. This work represents an extension of the advanced trackers that use both translation and attitude data to improve accuracy of trajectory tracking and prediction. The novel extension in this work deals with the development of a new tracking algorithm based on a radius of curvature estimator, use of regression based artificial measurements during the prediction interval and development ... |
|
| Real Time Stabilizing System for Pulsating Activity. |
05 SEP 1995 |
|
| Authors:
Mark L. Spano; William L. Ditto; Alan Garfinkel; James N. Weiss; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Electrical stimuli delivered to cardiac tissue at times determined from a chaos stabilizing algorithm, converts arrhythmia activity to periodic beating by an interbeat interval shortening action, utilizing real time calculation based on a system parameter experimentally determined from intervention by the electrical stimuli. |
|
| Reliability Modeling and Estimation Using U.S. Navy 3M Maintenance Data |
SEP 95 |
104 pages |
| Authors:
Jason J. Michal; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis provides a statistical and economic assessment tool for the analysis of failure characteristics of equipment whose failure data are reported in the U.S. Navy's Maintenance and Material Management (3M) system. The software accompanying this thesis is written in a programming language compatible with the Microsoft Excel (spreadsheet) operating environment. With the software, the reliability engineer will have the ability to manipulate and analyze 3M data directly using customized ... |
|
| Statistical Genetic Methods for Localizing Multiple Breast Cancer Genes |
SEP 95 |
8 pages |
| Authors:
Jurg Ott; COLUMBIA UNIV NEW YORK
|
| Genetic risks are often computed as a single number (a so-called point estimate) under the assumption that all parameters involved in the calculation of the risk are known without error. In previous work, a method was developed to allow for variability in these parameters. Technically, by the use of the maximum likelihood method, a support interval (approximate confidence interval) is constructed for the risk. This method has been extended to ... |
|
| Effects of Speciation In Sediment-Water Exchange of Metals |
31 AUG 95 |
4 pages |
| Authors:
John R. Donat; David J. Burdige; OLD DOMINION UNIV RESEARCH FOUNDATION NORFOLK VA
|
| Beginning in October 1993, we sampled sediments from two estuarine sites in Chesapeake Bay having contrasting biogeochemical and physical characteristics. Temporal variability at these sites has been examined during fall '93 and spring '94. Our results show that total dissolved copper concentrations in upper pore water intervals (8-11 nM) are similar to bottom water concentrations (5-12 nM). Virtually all of the copper (96.9 to 99.9%) dissolved in the pore waters ... |
|
| Improvement of Real Time f0F2 Prediction for OTH Radars |
29 AUG 95 |
52 pages |
| Authors:
B. S. Dandekar; PHILLIPS LAB HANSCOM AFB MA
|
| Dandekar and Buchau (1986) presented an empirical algorithm for improving the f(0)F(2) predictions for the sunrise transition period. The algorithm uses an average hourly gradient obtained from the previous four days f(0)F(2) observations and the 'present' f(0)F(2), to predict f(0)F(2) for the next hour. A further improvement was achieved by adding a second order correction term to the averaged slope. The second order correction takes into account (1) the change ... |
|
| Michigan Breast Reconstruction Outcome Study |
15 JUL 95 |
64 pages |
| Authors:
Edwin G. Wilkins; MICHIGAN UNIV ANN ARBOR
|
| The objective of the Michigan Breast Reconstruction Outcome Study (MBROS) is to compare the long-term outcomes of two common techniques of post-mastectomy breast reconstruction: tissue expansion/breast implants and transverse rectus abdominis musculocutaneous (TRAM) flaps. A four year prospective study, the project seeks to adapt existing instruments and formulate new methodologies to assess outcomes in five categories: complication rates, aesthetic results, functional results, psychosocial status and costs. Measurements of outcome variables ... |
|
| Edge Completion Sequences for Classes of Chordal Graphs |
JUN 95 |
52 pages |
| Authors:
Richard M. Odom; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Given an incomplete graph G = (V, E) of order n and size m and possessing some property P, a P-Completion sequence for G is a sequence e1,,,,,, es of edges, where s = (n2) - m, with the property that if Go = G then (1) Gi is obtaIned from G(i-1) by insertion of exactly one edge and (2) Gi has property P for each 1 |
|
| Three Cuts for Accelerated Interval Propagation |
MAY 95 |
7 pages |
| Authors:
David A. McAllester; Pascal Van Hentenryck; Deepak Kapur; MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB
|
| This paper addresses the problem of nonlinear multivariate root finding. In an earlier paper we describe a system called Newton which finds roots of systems of nonlinear equations using refinements of interval methods. The refinements are inspired by Al constraint propagation techniques. Newton is competitive with continuation methods on most benchmarks and can handle a variety of cases that are infeasible for continuation methods. This paper presents three "cuts" which ... |
|
| Fatigue Reliability Method with In-Service Inspections |
MAY 95 |
28 pages |
| Authors:
M. Fleming; H. Harkness; B. Moran; T. Belytschko; NORTHWESTERN UNIV EVANSTON IL
|
| The first order reliability method (FORM) has traditionally been applied to probabilistic fatigue analyses for single inspection intervals. Accounting for inspections then requires several sequential FORM analyses and that the random distribution of crack lengths be recharacterized following each inspection. The augmented FORM presented here allows the reliability analyses to span several inspection periods without explicit characterization of the crack length distribution subsequent to each inspection. The method thereby preserves ... |
|
| Efficacy of Repeated Psychophysiological Detection of Deception Testing |
APR 95 |
51 pages |
| Authors:
Andrew B. Dollins; Victor L. Cestaro; Donald J. Pettit; DEPARTMENT OF DEFENSE POLYGRAPH INST FORT MCCLELLAN AL
|
| Physiological measures were recorded during repeated psychophysiological detection of deception (PDD) tests to determine if physiologic response levels change with test repetition. Two groups of 22 healthy male subjects completed six Peak of Tension PDD tests on each of two test days. A minimum between test day interval of six days was maintained. The treatment group was programmed to respond deceptively to one of seven test questions while the control ... |
|
| Parameter Estimation in Chaotic Systems |
APR 95 |
187 pages |
| Authors:
Elmer S. Hung; MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB
|
| This report examines how to estimate the parameters of a chaotic system given noisy observations of the State behavior of the system. Investigating parameter estimation for chaotic systems is interesting because of possible applications for high precision measurement and for use in other signal processing, communication, and control applications involving chaotic systems. In this report, we examine theoretical issues regarding parameter estimation in chaotic systems and develop an efficient algorithm ... |
|
| The Development of a Metamodel for a Major Weapon System Cost Model |
07 MAR 95 |
114 pages |
| Authors:
Paul W. Campbell; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Cost estimation is an integral part of the procurement process of major weapon systems. Despite this essential role, the cost estimation process is able to provide the decision makers and analysts with a limited amount of insight. This is due to the complex nature of the cost models that typically contain 20-30 cost estimating relationships (CERs) and 50-100 variables. In an effort to provide the decision makers and analysts with ... |
|
| Association of Tobacco Use with Injuries among Infantry Soldiers Carrying Loads on a 100-Mile Road March |
03 MAR 95 |
4 pages |
| Authors:
Katy L. Reynolds; Paul J. Amoroso; J. R. Dettori; C. E. Witt; J. J. Knapik; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
|
| PURPOSE: To examine the effect of tobacco use on injuries sustained during a physically demanding 100-mile road march. METhODS: A study was conducted with 212 infantry soldiers who marched with an Army backpack (mean weight 28.3+4 kg) 20 miles per day for five days. Prior to the march, all soldiers completed a demographic (i.e. age, race) and tobacco use questionnaire. All march-related injuries were recorded by physician assistants when a ... |
|
| Distributed Hard Real-Time Scheduling for a Software Prototyping Environment |
MAR 95 |
180 pages |
| Authors:
Mauricio DE Menezes Cordeiro; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Scheduling analysis is one of the most important activities in hard real-time systems development since the correctness of hard real-time systems depends not only on the logical results of computation, but also on the time at which the results are produced. This dissertation aimed at the development of both fundamental theory and software tools to support efficiently and reliably the scheduling of distributed hard real-time systems. The major work of ... |
|
| Automation and Cognition in Air Traffic Control: An Empirical Investigation |
FEB 95 |
17 pages |
| Authors:
O. U. Vortac; Mark B. Edwards; Dana K. Fuller; Carol A. Manning; OKLAHOMA UNIV NORMAN DEPT OF PSYCHOLOGY
|
| A simulation of an air traffic control task was the setting for an investigation of the functions of external cues in prospective memory. External cues can support the triggering of an action or memory for the content of the action. We focused on memory for the content and manipulated the temporal characteristics of the external cue to disentangle two possible functions the cue can support: (1) An external cue visible ... |
|
| Air Ground Data Link VHF Airline Communications and Reporting System (ACARS) Preliminary Test Report |
FEB 95 |
35 pages |
| Authors:
Albert Rehmann; Jose D. Mestre; FEDERAL AVIATION ADMINISTRATION TECHNICAL CENTER ATLANTIC CITY NJ
|
| An effort was conducted to determine actual ground to air, and air to ground performance of the Airline Communications and Reporting system (ACARS), Very High Frequency (VHF) Data Link System. Parameters of system throughput, error rates, and availability were measured by tabulating statistics of messages ranging from 2 to 150 bytes in length. The intervals of transmission were developed based on anticipated air traffic service (ATS) requirements for tactical air ... |
|
| Method And System For Reducing Drag On A Body Moving Through A Fluid Medium. |
15 NOV 1994 |
|
| Authors:
Richard A. Katz; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A method of detecting the onset of turbulence in connection with a body moving through a fluid medium and of reducing body drag and as well reducing the amount of drag noise radiated from the body. First, the body is supplied with sensors each for generating a signal suitable for measuring amplitude of pressures fluctuations of the of this medium proximate a region of said sidewall of the body in ... |
|
| Development of Improved Geophysical Imaging Techniques for Environmental Site Characterization |
08 OCT 94 |
43 pages |
| Authors:
Robert J. Greaves; Jung M. Lee; David P. Lesmes; M. N. Toksoef; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF EARTH ATMOSPHERIC AND PLANETARY SCIENCES
|
| The common midpoint (CMP) processing technique has been shown to be effective in improving the results of ground penetrating radar profiling. When radar data are collected with the CMP multi-offset geometry, stacking increases the signal-to-noise ratio of subsurface radar reflections and the effective penetration depth. An important aspect of CMP processing is normal moveout velocity analysis. Most, if not all, GPR surveys, are very limited in spatial extent and the ... |
|
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