216 research outputs found

    Fault-Tolerant Control of a Distributed Database System

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    Optimal state information-based control policy for a distributed database system subject to server failures is considered. Fault-tolerance is made possible by the partitioned architecture of the system and data redundancy therein. Control actions include restoration of lost data sets in a single server using redundant data sets in the remaining servers, routing of queries to intact servers, or overhaul of the entire system for renewal. Control policies are determined by solving Markov decision problems with cost criteria that penalize system unavailability and slow query response. Steady-state system availability and expected query response time of the controlled database are evaluated with the Markov model of the database. Robustness is addressed by introducing additional states into the database model to account for control action delays and decision errors. A robust control policy is solved for the Markov decision problem described by the augmented state model

    Fine arts in undergraduate education - a possible and effective approach

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    This communication tells experiences lived by Universidade Federal do Paraná, Coastal Sector, which adopted the Visual Arts as cross wind axe inside of the curricular proposals of its diverse courses of graduation, technical and high school. This institution is the most recent campus of one of the oldest universities of the country and has as its main characteristic the innovation in the teach-learning process.Peer Reviewe

    General legal considerations relevant to highway safety countermeasure development and implementation. Final report

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    Notes: Report covers the period Nov 1976-Oct 1979. Released July 1980. Contract amount $199,000National Highway Traffic Safety Administration, Washington, D.C.http://deepblue.lib.umich.edu/bitstream/2027.42/484/2/44934.0001.001.pd

    Preliminary assessment of the legal feasibility of proposed programs involving citizen reporting of traffic-law violations. Letter report

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    Notes: Released July 1980National Highway Traffic Safety Administration, Washington, D.C.http://deepblue.lib.umich.edu/bitstream/2027.42/483/2/44952.0001.001.pd

    Legal memorandum on constitutionality of mandatory motorcycle helmet use statutes

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    http://deepblue.lib.umich.edu/bitstream/2027.42/683/2/36687.0001.001.pd

    Occupant restraints and traffic crash loss reduction

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    Motor Vehicle Manufacturers Association, Detroit, Mich.http://deepblue.lib.umich.edu/bitstream/2027.42/342/2/46436.0001.001.pd

    An analysis of the potential legal constraints on proposed model legislation creating a class of traffic offenses aggravated by alcohol. Final report

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    Notes: Report covers the period Nov 1976-Sept 1979. Released July 1980. Contract amount $199,000National Highway Traffic Safety Administration, Washington, D.C.http://deepblue.lib.umich.edu/bitstream/2027.42/520/2/44929.0001.001.pd

    Managing the speed crash risk

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    Motor Vehicle Manufacturers Association, Detroit, Mich.http://deepblue.lib.umich.edu/bitstream/2027.42/339/2/46440.0001.001.pd

    Editorial

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