Wyniki wyszukiwania - Biblioteka Nauki

1

New existence theorems for solutions of generalized quasi-variational inequalities

100%

Wu X.

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1998

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tom Vol. 4, nr 1

53-62

EN

In this paper, we give several existence theorems for solutions of the generalized quasi-variational inequalities under new conditions. Even in topological vector spaces, our results are new.

2

Existence theorems for maximal elements in H-spaces with applications on the minimax inequalities and equilibrium of games

100%

Wu X.

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2000

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tom Vol. 6, nr 2

283-293

EN

In this paper, we give two new existence theorems for maximal elements in H-spaces. As their applications, we obtain a extended version of Fan-Yen minimax inequality and some new existence theorems of an equilibrium for a qualitative game and an abstract economy. Our main results not only generalize the corresponding results of [4, 12, 15, 16] to H -spaces, but also the open question raised by Yannelis and Prabhakar [15] is answered in affirmative.

3

A new generalization of browder fixed point theorem with applications

63%

Wu X. , Xu Y.

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1998

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tom Vol. 4, nr 2

205-214

EN

In the present paper, a new generalization of Browder fixed point theorem is obtained. As its applications, we obtain some generalized versions of Browder's theorems for quasivariational inequality and Ky Fan's minimax inequality and minimax principle.

4

On minimax inequality and generalized quasi-variational inequality in h-spaces

63%

Wu X. , Zhang Z.

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1999

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tom Vol. 5, nr 1

59-70

EN

In this paper, we give a new minimax theorem and two new existence theorems of solutions for generalized quasi-variational inequalities in H-spaces. Our results improve and develop some famous results.

5

Model badania potwierdzającego niezawodność dla dwumianowych systemów o rosnącej niezawodności

63%

Wu X. , Liu Q.

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2010

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tom nr 2

55-58

PL

Wiele złożonych systemów inżynieryjnych przechodzi proces wzrostu niezawodności w kolejnych etapach badań. Większość istniejących modeli badań potwierdzających niezawodność nie uwzględnia jednak wzrostu niezawodności. W niniejszym artykule przedstawiono model badania niezawodności dla systemów dwumianowych o 2 etapach testowych, który bierze pod uwagę możliwy wzrost niezawodności. Określono wskaźniki prawdopodobieństwa dla różnych możliwych sytuacji oraz wyprowadzono statystyczne reguły decyzyjne. Podany przykład ilustruje względnie niższe ryzyko decyzyjne proponowanego modelu w stosunku do tego, jakie niosą klasyczne modele badań.

EN

Many complex engineering systems experience reliability growth in successive test stages. In most existing reliability demonstration test models, reliability growth is not incorporated. In this paper, for binomial systems with 2 test stages, a reliability demonstration test model is presented that takes possible reliability growth into consideration. Likelihood ratios are defi ned for various possible situations, and statistical decision rules are derived. With a given example, the relative lower decision risk of the proposed model is illustrated by comparison with that of classical demonstration test models.

6

Privacy Preserving Database Generation for Database Application Testing

51%

Wu X. , Wang Y. , Guo S. , Zheng Y.

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2007

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tom Vol. 78, nr 4

595-612

EN

Testing of database applications is of great importance. Although various studies have been conducted to investigate testing techniques for database design, relatively few efforts have been made to explicitly address the testing of database applications which requires a large amount of representative data available. As testing over live production databases is often infeasible in many situations due to the high risks of disclosure of confidential information or incorrect updating of real data, in this paper we investigate the problem of generating synthetic databases based on a-priori knowledge about production databases. Our approach is to fit the general location model using various characteristics (e.g., constraints, statistics, rules) extracted from a production database and then generate synthetic data using model learned. The generated data is valid and similar to real data in terms of statistical distribution, hence it can be used for functional and performance testing. As characteristics extracted may contain information which may be used by attackers to derive some confidential information about individuals, we present our disclosure analysis method which applies cell suppression technique for identity disclosure and perturbation for value disclosure analysis.

7

Simultaneous electrochemical detection of hydroquinone and catechol in binary mixtures using poly(cysteine)-modified glassy carbon electrode

38%

Wang L. , Huang P. , Bai J. , Wu X. , Wang H. , Zhao Y.

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2007

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tom Vol. 52, No. 1

15-24

EN

A simple and highly selective electrochemical method for simultaneous detection of hydro-quinone and catechoi using a glassy carbon electrode modified with poty(cysleine) has been developed. The modified electrode has shown an excellent electrocatalytical effect on cyclic voltammctric oxidation of hydroquinone and calechol in 0. l mol L"1 acetate buffer solution (pH 5.0). in differentia! pulse voltammograms (DPV), oxidation peak potentials of hydroquinone and catechoi recorded atpoly(cysteinc)-modified electrode in the same solution were separated b\ about 100 mV. At a bare electrode they overlapped giving a single broad peak due to the fouling effect by the oxidation product of hydroquinone and catechoi signal the fouling effect has been achieved by using po!y(cysteine)-modified electrodes. Detection limit of hydroquinone in the presence of 1.0 x10-4 mol L-4 catechoi was 8.0 x 10-7 mol L-1, and detection limit of catechoi in the presence of 1.0 x10-4 mol L-4 hydroquinonewas 1.0 x 10mol L-1. The proposed method has been applied to simultaneous detection of hydroquinone and catechoi in a water sample with simplicity and high selectivity.

PL

Opracowano prostą i wysoko selektywną metodę równoczesnego oznaczania hydrochinonu i katecholu. Do oznaczania użyto elektrody z węgla szklistego zmodyfikowanej policysteiną. Na zmodyfikowanej elektrodzie, w roztworze buforu octanowego o pH 5.0, w przypadku obu analitów. występował silny efekt elcktrokatalityczny. Na różnicowych woltampero-gramach pulsowych potencjały pików analitów różniły się o ok. 100 mV. W przypadku elektrody niernodyfikowanej otrzymywano tylko jeden, szeroki pik. Ewidentnie warstwa policysteiny chroniła powierzchnię elektrody przed zatruciem produktami utlenienia hydrochinonu i katecholu. Granicę wykrywalności hydrochinonu w obecności 1.0 x10-4 katecholu oszacowano na 8.0 x 10-7 mol L-1. Z kolei granica wykrywalności katecholu w obecności 1.0 x 10-4mol L-1 hydrochinonu wynosiła l x 10-6 mol L-1. Nową metodę zastosowano do jednoczesnego oznaczania hydochinonu i katecholu w próbkach wody.