摘要 :
Automated aircraft control has traditionally been divided into distinct "functions" that are implemented separately (e.g., autopilot, autothrottle, flight management); each function has its own fault-tolerant computer system, and ...
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Automated aircraft control has traditionally been divided into distinct "functions" that are implemented separately (e.g., autopilot, autothrottle, flight management); each function has its own fault-tolerant computer system, and dependencies among different functions are generally limited to the exchange of sensor and control data. A by-product of this "federated" architecture is that faults are strongly contained within the computer system of the function where they occur and cannot readily propagate to affect the operation of other functions. More modern avionics architectures contemplate supporting multiple functions on a single, shared, fault-tolerant computer system where natural fault containment boundaries are less sharply defined. Partitioning uses appropriate hardware and software mechanisms to restore strong fault containment to such integrated architectures. This report examines the requirements for partitioning, mechanisms for their realization, and issues in providing assurance for partitioning. Because partitioning shares some concerns with computer security, security models are reviewed and compared with the concerns of partitioning.
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摘要 :
Automated aircraft control has traditionally been divided into distinct 'functions' that are implemented separately (e.g., autopilot, autothrottle, flight management); each function has its own fault-tolerant computer system, and ...
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Automated aircraft control has traditionally been divided into distinct 'functions' that are implemented separately (e.g., autopilot, autothrottle, flight management); each function has its own fault-tolerant computer system, and dependencies among different functions are generally limited to the exchange of sensor and control data. A by-product of this 'federated' architecture is that faults are strongly contained within the computer system of the function where they occur and cannot readily propagate to affect the operation of other functions. More modern avionics architectures contemplate supporting multiple functions on a single, shared, fault-tolerant computer system where natural fault containment boundaries are less sharply defined. Partitioning uses appropriate hardware and software mechanisms to restore strong fault containment to such integrated architectures. This report examines the requirements for partitioning, mechanisms for their realization, and issues in providing assurance for partitioning. Because partitioning shares some concerns with computer security, security models are reviewed and compared with the concerns of partitioning.
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This working paper documents Task B of the present project, Identify AdvancedTraveler Information Systems (ATIS) and Commercial Vehicle Operations (CVO) System Objectives and Performance Requirements. The goal of Task B is to defi...
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This working paper documents Task B of the present project, Identify AdvancedTraveler Information Systems (ATIS) and Commercial Vehicle Operations (CVO) System Objectives and Performance Requirements. The goal of Task B is to define the transportation community's current conceptualization of ATIS and CVO, providing a baseline of information for subsequent tasks. Information was obtained from a literature review, conducted as the first task of the project, and by interviewing and surveying government and private representatives of the ATIS and CVO development community. The results of this report have supported subsequent project tasks by: (1) Providing basic information regarding the range of operational capabilities to be included in ATIS and CVO systems for use in the more specific definition of system functions and features during the conduct of Task C, Define Functions; (2) Providing a survey of ATIS and CVO systems currently developed, or under development, in support of Task D, Comparable Systems Analysis; (3) Providing a preliminary set of ATIS and CVO scenarios that can be further elaborated during the conduct of Task E, Task Analysis; and (4) Providing a summary of performance requirements currently identified by the transportation community for subsequent incorporation in project research. (Tasks H, K, and M).
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This report discusses methods to assess the benefits of Intelligent Transportation Systems. It provides a comprehensive review of methods currently available in the United States. It develops a framework for benefits assessment us...
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This report discusses methods to assess the benefits of Intelligent Transportation Systems. It provides a comprehensive review of methods currently available in the United States. It develops a framework for benefits assessment using benefit trees and emerging analysis methods for benefit studies at the sketch planning level. These efforts should lead to specifications for information needs for evaluating ITS projects and methods to compare ITS projects with other traditional capacity enhancing projects.
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This contract final technical report documents the Automated Response to Intrusion project results. This project extended concepts developed in the Dynamic Cooperating Boundary Controllers project, which developed the initial vers...
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This contract final technical report documents the Automated Response to Intrusion project results. This project extended concepts developed in the Dynamic Cooperating Boundary Controllers project, which developed the initial version of the Intruder Detection and Isolation Protocol (IDIP). IDIP provides an infrastructure for intruder tracking and containment. The focus of the extensions developed under the Automated Response to Intrusions project was to integrate the IDIP technology with selected security technologies to improve the effectiveness of the intrusion response system. This work also leveraged results from the Adaptive System Security Policies contract. This report provides an overview of the current IDIP implementation and the results of this contract. It also provides references to IDIP documentation and technical papers where more detail can be found on the IDIP implementation and architecture.
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A control system for flexible manufacturing systems to control work stations and the manufacturing process was developed. Work scheduling and material flow control are described. The coordinated action of the control and monitorin...
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A control system for flexible manufacturing systems to control work stations and the manufacturing process was developed. Work scheduling and material flow control are described. The coordinated action of the control and monitoring systems enables malfunction in production process to be detected without delay and the steps to be taken at the various control levels. Automation of workpiece flow imposes additional tasks on the system director and material-flow control, which are already taken into account in the program system.
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This report details the findings of a usability study for the Washington State Department of Transportation (WSDOT) of traffic and weather information on the Web. The purpose of this test was to examine the user experience associa...
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This report details the findings of a usability study for the Washington State Department of Transportation (WSDOT) of traffic and weather information on the Web. The purpose of this test was to examine the user experience associated with retrieving traveler information, such as road conditions, traffic congestion, pass information, construction, and weather, from the WSDOT Traffic and Weather site.
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Expert systems have considerable potential to assist computer users in managing the large volume of information available to them. One possible use of an expert system is to model the information retrieval interests of a human use...
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Expert systems have considerable potential to assist computer users in managing the large volume of information available to them. One possible use of an expert system is to model the information retrieval interests of a human user and then make recommendations to the user as to articles of interest. At Cal Poly, a prototype expert system written in the C Language Integrated Production System (CLIPS) serves as an Automated Information Retrieval System (AIRS). AIRS monitors a user's reading preferences, develops a profile of the user, and then evaluates items returned from the information base. When prompted by the user, AIRS returns a list of items of interest to the user. In order to minimize the impact on system resources, AIRS is designed to run in the background during periods of light system use.
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During the fourth reporting period the cooperation partners mainly dealt with the specification of the LOMA 2.0 system. The related activities comprised the elaboration of design documents together with the supplier as well as the...
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During the fourth reporting period the cooperation partners mainly dealt with the specification of the LOMA 2.0 system. The related activities comprised the elaboration of design documents together with the supplier as well as the coordination of user requirement with important stakeholders. Further the project management interface with the LOMA 2.0 supplier required additional efforts due to frequent changes of the supplier's project manager and general lack of proper use of adequate PM tools. A common kick-off meeting with the system supplier has been held in May 2011, followed by regular weekly web meetings.
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This document is a supplement to The Wright Laboratory Manufacturing TechnologyDirectorate's Project Book 1995. It is not a replacement, but rather an enhancement to an already vital living report with the specific purpose of prom...
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This document is a supplement to The Wright Laboratory Manufacturing TechnologyDirectorate's Project Book 1995. It is not a replacement, but rather an enhancement to an already vital living report with the specific purpose of promoting the transfer of technology. It is organized in such a way as to provide information needed to decide whether the technology described will be useful.
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