WorldCat Identities

BBN SYSTEMS AND TECHNOLOGIES CORP CAMBRIDGE MA

Overview
Works: 111 works in 123 publications in 1 language and 123 library holdings
Publication Timeline
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Most widely held works by BBN SYSTEMS AND TECHNOLOGIES CORP CAMBRIDGE MA
Stereoscopic Digital Mammography: Improving Cancer Diagnosis( )

5 editions published between 1997 and 2000 in English and held by 5 WorldCat member libraries worldwide

The subject of study in this project was the potential benefit of using stereoscopic digital mammography as an adjunct to standard film mammography to improve the detection and diagnosis of breast cancer. We sought to determine whether stereo mammography might bring significant gains - either in earlier detection of worrisome lesions, or in more accurate discrimination of lesions as benign or malignant. Several main activities were required to accomplish this evaluation. We further developed and refined a system for capturing and viewing stereo mammograms, using state-of-the-art digital methods. Over the duration of the project, stereo mammograms and film studies were acquired on a large number of path-proven cases. Three experienced mammographers served as consultants, and an extensive effort was devoted to developing with them a comprehensive list of visual features to consider in reading the stereo mammograms. In a final reading study with 137 cases, we measured diagnostic accuracy obtained with standard film mammograms alone compared to that obtained with film combined with the stereo mammogram. We found that the stereo mammogram significantly improved diagnostic accuracy. A second, exciting finding was that new, additional lesions, mostly masses, were detected in the stereo mammogram but were not visible in the film study, in 30% of the cases
Research and Development in Natural Language Understanding as Part of the Strategic Computing Program( Book )

3 editions published between 1988 and 1989 in English and held by 3 WorldCat member libraries worldwide

This report includes a collection of reprints reporting natural language research. The problem of acquiring linguistic knowledge is the chief obstacle to widespread use of natural language technology. Chapter 1 and 4 report results of five to tenfold increase in our productivity in moving the Janus and Parlance natural language shells to new application domains. The ability of natural language systems to cooperatively handle novel, errorful, or incomplete forms is also critical; chapter 3 and 5 report new techniques for intelligently and graceful respond to such forms. Chapter 2 reports on an implementation of a discourse module for understanding definite reference. (KR)
IRUS-II User Manual( Book )

2 editions published in 1989 in English and held by 2 WorldCat member libraries worldwide

This user's manual for the Irus-II natural language sys tem describes the capabilities of the different modes of the end user interface for Irus-II, including entering and editing queries, the history list, control of processing, viewing of the intermediate results, window management and the use of files of queries. There is a companion document to this one, A Guide to Irus-II Application Development, BBN Report 7144, intended for use by developers, that describes the internal operation of Irus-II, including the dictionary, domain model, semantic interpretation rules, and back-end translation rules. Irus-II is part of a larger system called Janus, which is composed of a number of seamless interface utilities, including understanding (provided by Irus-II), generation (provided by Spokesman), maps, and other graphics tools. (kr)
Usable, Real-Time, Interactive Spoken Language Systems( )

2 editions published between 1992 and 1994 in English and held by 2 WorldCat member libraries worldwide

The objective of this project was to make the next significant advance in human-machine interaction by developing a spoken language system (SLS) that operates in real-time while maintaining high accuracy on cost- effective COTS (commercial, off-the-shelf) hardware. The system has a highly interactive user interface, is largely user independent and to be easily portable to new applications. The BBN HARC spoken language system consists of Byblos speech recognition system and the Delphi or HUM language understanding system
Cronus/Mach integration( Book )

2 editions published in 1997 in English and held by 2 WorldCat member libraries worldwide

This document is the final technical report for the Cronus/Mach Integration Project. The work for the project was performed over the period from June 1993 through March 1996. This project was funded by the U.S. Air Force Rome Laboratory (RL) under contract F30602-93-C-0033. The objective of this effort is to integrate the capabilities of the Cronus distributed computing system with the capabilities of the Mach kernel to achieve superior functionality, performance and usability. This report was written by BBN together with its subcontractor, Trusted Information Systems (TIS)
Development of a spoken language system : final report( )

2 editions published between 1990 and 1992 in English and held by 2 WorldCat member libraries worldwide

This report describes the activities performed and the progress made in the development of HARC (Hear And Respond to Continuous speech), BBN's spoken language system, from May 1, 1989 to February 29, 1992. Significant progress has been made both in terms of speed of understanding and accuracy of understanding. New search algorithms BBN developed during this period increased the speed of HARC by more than three orders of magnitude. The result has been the first spoken language system that runs in real-time on an off-the-shelf workstation, with no additional hardware. Furthermore, real-time performance was achieved without losing understanding accuracy. In tests performed by the National Institute of Standards and Technology (NIST) on data collected from the DARPA airline Travel Information System (ATIS) domain, the BBN HARC system had the best speech recognition and speech understanding performance. Another important milestone in this project has been the demonstration of HARC in a military logistical transportation planning application
Testing and Refining a Core Theory of Human Plausible Reasoning( Book )

2 editions published between 1991 and 1996 in English and held by 2 WorldCat member libraries worldwide

This report details our extensions of a formal theory of human plausible reasoning. It presents an overview of the theory and experimental work
Network Architecture and SONET Services in the NASA-ARPA Gigabit Satellite Network using NASA's Advanced Communications Technology Satellite (ACTS)( Book )

2 editions published in 1993 in English and held by 2 WorldCat member libraries worldwide

The Gigabit Satellite Network, a project jointly sponsored by ARPA and NASA, will provide long-haul STS-3 (155.54 Mb/s) and STS-12 (622.08 Mb/s) point-to-point and point-to-multipoint full-duplex services over NASA's Advanced Communications Technology Satellite (ACTS). Data multiplexing over the satellite will be accomplished using TDMA techniques coordinated with the switching and beam hopping facilities provided on-board the ACTS. Transmissions to the satellite will be protected using Reed-Solomon encoding, providing almost error-free clear-sky transmissions and, in the case of rain-fade, bit error rates better than 10(exp -11) 99.0% of the time. Unique to the system architecture are a TDMA frame structure an satellite synchronization mechanisms that, together, will allow (1) very efficient utilization of the satellite capacity, (2) over-the-satellite closed-loop synchronization of network configurations with up to 64 earth stations, and (3) earth station initial acquisition without collisions with existing signaling or data traffic. The end-user interfaces will use fiber-optics and will be compatible with SONET standards for fiber-based terrestrial networks. The terrestrial interfaces at the earth stations will perform the function of conventional SONET multiplexers and, as such, can be readily integrated with standard SONET fiber or radio-based terrestrial networks. As SONET multiplexers in the SONET hierarchy, the earth stations will synchronize the geographically-separated end-user interfaces
SIMNET CVCC Software Design Document( Book )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

The Inter Vehicle Information System (IVIS) provides different types of reports that you can create, save, send, receive, delete and relay. Ivis also supports Position Navigation System (POSNAV) which helps you navigate your tank more efficiently and effectively. IVIS is integrated into a larger system know as the Combat Vehicle Command and Control System (CVCC)
Toward Real-Time Continuous Speech Recognition( )

1 edition published in 1989 in English and held by 1 WorldCat member library worldwide

This final report describes research on real-time speech recognition. The authors developed, under other DARPA-funded contracts, a system for continuous speech recognition. BYBLOS, the BBN Continuous Speech Recognition System, consists of a general paradigm and several algorithms for high performance speech recognition. The goals of the real-time project have been: 1) Develop algorithms and hardware for near-real time speech recognition; and 2) Develop and assess techniques for using highly parallel machines for continuous speech recognition. The authors investigated the use of the Butterfly parallel processor for increasing the speed of speech recognition. They found that is was possible to achieve factors of 10 speedup with minimal effort. More effort was required to achieve high efficiency on larger machines with 64 or more processors. Implemented was a near-real-time demonstration of continuous speech recognition with a grammar
SIMNET CVCC IVIS Utilities User Manual( Book )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

The CVCC includes two Macintosh computers that run IVIS utilities called IVIS send and IVIS listen. These utilities are used solely to send IVIS reports to the network, and to listen for incoming reports and print them. They are documented in this user manual
SIMNET Combat Vehicle Command and Control (CVC2) System User's Guide( Book )

1 edition published in 1990 in English and held by 1 WorldCat member library worldwide

This document is intended for use by persons with an interest in the operational procedures associated with the Simulation Network Developmental (SIMNET-D) based implementation of Combat Vehicle Command and Control (CVC2). CVC2 is a research and development program in support of automated and interoperable command, control, and communications (C3) systems for ground combat vehicles. The program is funded by the Balanced Technology Initiative (BTI) program, tech base funds and, for NATO interoperability, funds from the Nunn Agreement. This User's Guide is not intended to reflect the final functionality and operational procedures for a fielded automated C3 system, rather its represents a test bed containing an evolving system of proposed functions which will change and improve based on soldier utilization and soldier recommendations from experiments conducted in the SIMNET-D facility
SIMNET Dismounted Infantry Simulator Validation Checklist( Book )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

This document contains two parts: A completed Validation Checklist that summarizes the currently-implemented functionality of the SIMNET Dismounted Infantry (DI) Simulator, and A Physical Configuration Checklist, listing all physical components of the DI Simulator. The DI Validation Checklist is intended to be used by the Government to validate the deliverables under the SIMNET Bridge contract. The Checklist was developed by the authors of the DI Simulator Functional Specification (dated 23 February 1990). The authors reviewed the currently-implemented DI Simulation to determine which functions had been fully or partially implemented, and which functions remained to be implemented. SIMNET is a research and development program, as compared with a system procurement program. A SIMNET functional specification provides guidance for the developers, and is not considered a system specification. Thus, the system as actually implemented may vary from the description provided in the functional specification; however, all functions are intended to be fully developed
Algorithms That Learn to Extract Information BBN: Description of the Sift System as Used for MUC-7( )

1 edition published in 1998 in English and held by 1 WorldCat member library worldwide

For MUC-7, BBN has for the first time fielded a fully-trained system for NE, TE, and TR; results are all the output of statistical language models trained on annotated data, rather than programs executing handwritten rules. Such trained systems have some significant advantages: 1. They can be easily ported to new domains by simply annotating data with semantic answers. 2. The complex interactions that make rule-based systems difficult to develop and maintain can here be learned automatically from the training data. We believe that the results in this evaluation are evidence that such trained systems, even at their current level of development, can perform roughly on a par with rules hand-tailored by experts. Since MUC-3, BBN has been steadily increasing the proportion of the information extraction process that is statistically trained. Already in MET-1, our name-finding results were the output of a fully statistical, HMM-based model, and that statistical Identifinder(trademark) model was also used for the NE task in MUC-7. For the MUC-7 TE and TR tasks, BBN developed SIFT, a new model that represents a significant further step along this path, replacing PLUM, a system requiring handwritten patterns, with SIFT, a single integrated trained model
Distributed Heuristics for Maintaining Connectivity in Mobile Networks (SRNTN-54)( Book )

1 edition published in 1986 in English and held by 1 WorldCat member library worldwide

In a packet radio network, a packet radio (PR) can establish links to any other PR within hearing range, but, if too many PRs are nearby, its link table may overflow. To maintain connectivity and keep their link-table sizes feasible it is necessary for PRs to choose a subset of all possible links. This selection problem resembles the problem of finding spanning trees in a distributed manner. We develop a distributed heuristic for choosing which links should be retained to keep the network connected. Since the heuristic uses only local information, it cannot guarantee to keep the network connected in those cases that require more global information. The heuristic is of interest because it requires less coordination, less information and, therefore, lower communications overhead than algorithms that guarantee to maintain connectedness. Packet switching; Radio links; Heuristic methods; Algorithms; Decision rules. (EDC)
Integrated High Performance Distributed System( )

1 edition published in 1994 in English and held by 1 WorldCat member library worldwide

The objective of the Integrated High Performance Distributed System (IHPDS) project is to design, implement, and demonstrate a distributed programming environment that will integrate and support very high bandwidth networks with heterogeneous computer architectures, including parallel and specialized processors, and that will support multiple programming models. The IHPDS project is developing the Photon distributed programming environment to meet the emerging needs of distributed application programmers. Photon provides an object-oriented programming model. This provides users with a consistent view of all services while insulating the user from the implementation details of those services. This enforcement of modularity and the separation of policy and mechanism make the object model a powerful way to build large-scale, distributed applications. Photon is a distributed computing environment that supports distributed application development across heterogeneous machine architectures and programming languages. It is particularly targeted to support the needs of high performance applications. Photon not only supports applications whose components are located within a single local area network, but also supports applications whose components are widely dispersed geographically
The SIMNET Network and Protocols. Revision( Book )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

SIMNET is an advanced research project sponsored by the Defense Advanced Research Projects Agency (DARPA) in partnership with the United States Army. Currently in its sixth year, the goal of the program is to develop the technology to build a large-scale network of interactive combat simulators. This simulated battlefield will provide, for the first time, an opportunity for fully-manned platoon-, company-, and battalion-level units to fight force-on-force engagements against an opposing unit of similar composition. Furthermore, it does so in the context of a joint, combined arms environment with the complete range of command and control and combat service support elements essential to actual military operations. All of the elements that can affect the outcome of a battle are represented in this engagement, with victory likely to go to that unit which is able to plan, orchestrate, and execute their combined-arms battle operations better than their opponent. Whatever the outcome, combat units will benefit from this opportunity to practice collective, combined arms, joint war fighting skills at a fraction of the cost of an equivalent exercise in the field. This report describes the SIMNET network and its communication facilities and protocols
SIMNET CVCC Battalion TOC Workstation Quick Reference Release 1.5( Book )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

CONTENTS: Map Display Operations; Overlays; Message module operations
Use of Virtual Environment Training Technology for Individual Combat Simulation( )

1 edition published in 1993 in English and held by 1 WorldCat member library worldwide

For this research, 25 tasks and functions for dismounted soldiers were derived from Army training documents. Ten types of virtual environment technology were identified: visual display, visual sensing, auditory display, auditory sensing, haptic display, haptic sensing, whole-body movement, biomechanical articulation of Dismounted Infantry (DI) models, influence of physical condition on DI models, and physical condition of trainee. For each type of technology, up to three levels of capability were identified that represent anticipated availability in the near, intermediate (3-5 years), or far (more than 5 years) term. Subjective estimates were then made of the minimum level of technology required to support training of each of the tasks and functions. Although the technology that will be available in the near term does not appear to provide adequate training on all tasks and functions, it will nevertheless provide potential training and mission rehearsal benefits. Difficult problems yet to be resolved concern mission-specific training, urban and close-in operations, control and manipulation of weapons and equipment, and whole-body movement. Dismounted infantry, Simulation Networking (SIMNET), Virtual reality, Distributed interactive simulation, Virtual environments
SIMNET CVCC Battalion TOC Workstation User Manual Release 1.5( Book )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

The Battalion Tactical Operations Center (BnTOC) workstation provides a capability for passing electronic messages, tracking friendly vehicles, and relaying status information of simulators on the SIMNET network. Part of the SIMNET Combat Vehicle Command and Control (CVC2) system, it is designed to support experiments and evaluation of the soldier-machine interface and to ease task loading on staff at the battalion headquarters level. In addition to being designed to interface with the CVC2 system, it will eventually interface with a simulation of the Maneuver Control System (MCS). The BnTOC workstation must also support an interface with a NATO Portable Computer Unit, or suitcase version of CVC2. Each of the workstations resides on a TOC local area network (LAN) and will share data with the other workstations on the LAN. The software for each workstation is unique; however, many of the individual routines will be resident on more than one workstation to permit individual staff sections to manipulate data as necessary to perform their duties
 
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English (32)