Read e-book online Algorithms from P to NP, Vol. I: Design and Efficiency PDF

By Bernard Moret, Henry D. Shapiro

ISBN-10: 0805380086

ISBN-13: 9780805380088

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Note that for locking-based concurrency control algorithms, conservative TO schedulers are denoted pessimistic concurrency control algorithms, and aggressive TO schedulers are denoted optimistic concurrency control algorithms. Papadimitriou gives a good overview of concurrency control algorithms [104]. Another good book on the subject is Bernstein et al. [19]. Pessimistic This section on pessimistic concurrency control algorithms covers the basic two-phase locking algorithm (2PL) and the enhanced high-priority two-phase locking algorithm, which is more suited for real-time systems than the former algorithm.

3. Construct a transformation from Π to GSUCDF. A lemma (page 34 in [48]) says that if there exists a polynomial transformation of a problem into another problem which can be solved in polynomial time, then the rst problem can also be solved in polynomial time. However, if there exists a polynomial transformation of a problem, Π1 , which is not in P , into another problem, Π2 , then Π2 is also not in P . 3. 2: Set-union knapsack problem (SUKP). 4. Show that the transformation takes polynomial time.

10) give that [44, 113]: 1. , the model predicts values based on the values set on the parameters of the model, b, and on the readings used as inputs, X. 2. The vector of residuals is given by e = Y − Yˆ . 3. It is possible to calculate con dence intervals of values in b based on the t-distribution. 4. , check whether the hypothesis that b = 0 can be rejected. There are different metrics that measure how well Yˆ estimates Y . One such metric is the R2 value which is calculated as 1− n ˆi )2 i=1 (yi − y .

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Algorithms from P to NP, Vol. I: Design and Efficiency by Bernard Moret, Henry D. Shapiro

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