Multi-level transactions have received considerable attention as a framework for high-performance concurrency control methods. An inherent property of multi-level transactions is the need for compensating actions, sin...
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ISBN:
(纸本)0897913523
Multi-level transactions have received considerable attention as a framework for high-performance concurrency control methods. An inherent property of multi-level transactions is the need for compensating actions, since state-based recovery methods do no longer work correctly for transaction undo. The resulting requirement of operation logging adds to the complexity of crash recovery. In addition, multi-level recovery algorithms have to take into account that high-level actions are not necessarily atomic, e.g., if multiple pages are updated in a single *** this paper, we present a recovery algorithm for multi-level transactions. Unlike typical commercial database systems, we have striven for simplicity rather than employing special tricks. It is important to note, though, that simplicity is not achieved at the expense of performance. We show how a high-performance multi-level recovery algorithm can be systematically developed based on few fundamental principles. The presented algorithm has been implemented in the DASDBS database kernel system.
The DURESS (Distributed University Research and Education and Support System) project is a joint effort of the Database and informationsystems Group at the Johann Wolfgang Goethe-University, Frankfurt, and the IBM Eu...
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A solution is presented to the L/sup 1/ minimization problem for plants with commensurate delays. In the special case where the weight has one pole, the problem can be solved by a single linear programming problem. Ot...
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A solution is presented to the L/sup 1/ minimization problem for plants with commensurate delays. In the special case where the weight has one pole, the problem can be solved by a single linear programming problem. Other special cases are also presented. A method for computing the optimal performance and a characterization of minimizing solutions are given.< >
作者：
Krcmar, Helmut A.OBaruch College
CUNY Dept. of Statistics and Computer Information Systems 17 Lexington Ave. New YorkNY10010 United States
The growing interest in the use of expert systems (ES) necessitates procedures to determine, when the use of ES-techniques is appropriate. The paper describes some recently suggested proposed criteria and reviews them...
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The paper presents a frequency-domain estimator which can identify both a nominal model of a plant as well as a frequency-domain bounding function on the modeling error associated with this nominal model. This estimat...
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The paper presents a frequency-domain estimator which can identify both a nominal model of a plant as well as a frequency-domain bounding function on the modeling error associated with this nominal model. This estimator, which we call a robust estimator, can be used in conjunction with a robust control-law redesign algorithm to form a robust adaptive controller.
We evaluated a Prolog machine PSI (Personal Sequential Inference machine) for the purpose of improving and redesigning it. In this evaluation, we measured the execution speed and the dynamic characteristics of cache m...
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A new computer system for Monte Carlo Experimentation is presented in this thesis. The new system speeds and simplifies the process of coding and preparing a Monte Carlo Experiment; it also encourages the proper desig...
ISBN:
(纸本)9780911801118
A new computer system for Monte Carlo Experimentation is presented in this thesis. The new system speeds and simplifies the process of coding and preparing a Monte Carlo Experiment; it also encourages the proper design of Monte Carlo Experiments, and the careful analysis of the experimental results.A new functional language is the core of this system. Monte Carlo Experiments, and their experimental designs, are programmed in this new language; those programs are compiled into Fortran output. The Fortran output is then compiled and executed. The experimental results are analyzed with a standard statistics package such as S, Isp, or Minitab or with a user supplied program. Both the experimental results and the experimental design may be directly loaded into the workspace of those *** new functional language frees programmers from many of the details of programming an experiment. Experimental designs such as factorial, fractional factorial or latin square are easily described by the control structures and expressions of the language. Specific mathematical models, such as arima(p,n,q) models, regression models with specific collinearity properties, tabular data generated by logit or log-linear models are generated by the routines of the language. Numerous random number generators and many standard statistic routines are included. It is easy to use standard variance reduction techniques, such as common or antithetic variables, conditional Monte Carlo, weighted samples, importance sampling or control variates.
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