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Digital Right Protection of Relational Databases

Thesis Info

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Author

Kamran, Muhammad

Program

PhD

Institute

National University of Computer and Emerging Sciences

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2012

Thesis Completion Status

Completed

Subject

Computer Science

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/835

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727737632

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Design and development of knowledge-preserving and robust water- marking techniques for digital ownership rights protection of relational databases is an active area of research. In this dissertation, various dis- ciplines have been used to design and develop watermarking techniques which ensure knowledge-preserving and robustness characteristics of wa- termarking techniques by bringing tolerable distortions in the original data. Different parameters are used to define data distortions in terms of information loss as a result of watermarking. The intelligent min- ing techniques and statistical measures have been utilized to define and measure information loss after watermark embedding in the relational databases. The data owner usually defines the usability constraints to control this information loss. These usability constraints in turn iden- tify the available bandwidth for watermark embedding. The watermark decoding accuracy of a watermarking algorithm generally depends on this bandwidth; larger the bandwidth the better the decoding accuracy (watermark robustness) and vice versa. However, this dissertation pro- poses a model to make the watermark decoding accuracy independent of this bandwidth and hence the usability constraints; as a result, max- imum decoding accuracy can be achieved even with very tight usability constraints and minimum data distortions. Such mechanism also helps to preserve the knowledge in the databases to a maximum level; as a consequence, the classification results for such databases are also pre- served after watermark embedding. In the pilot study, empirical study and formal modeling have been used to prove the knowledge-preserving and robustness characteristics of the proposed watermarking techniques for digital right protection.
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باراں ماہ ہک بیت وچ

باراں ماہ
(باراں ماہ ہک بیت وچ)

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Right to Life As a Human Right: A Comparative Study of Shari’ah and Law

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Application of Fractional Calculus to Engineering: A New Computational Approach

In this dissertation, a new heuristic computational intelligence technique has been developed for the solution for fractional order systems in engineering. These systems are provided with generic ordinary linear and nonlinear differential equations involving integer and non-integer order derivatives. The design scheme consists of two parts, firstly, the strength of feed-forward artificial neural network (ANN) is exploited for approximate mathematical modeling and secondly, finding the optimal weights for ANN. The exponential function is used as an activation function due to availability of its fractional derivative. The linear combination of these networks defines an unsupervised error for the system. The error is reduced by selection of appropriate unknown weights, obtained by training the networks using heuristic techniques. The stochastic techniques applied are based on nature inspired heuristics like Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) algorithm. Such global search techniques are hybridized with efficient local search techniques for rapid convergence. The local optimizers used are Simulating Annealing (SA) and Pattern Search (PS) techniques. The methodology is validated by applying to a number of linear and nonlinear fraction differential equations with known solutions. The well known nonlinear fractional system in engineering based on Riccati differential equations and Bagley- Torvik Equations are also solved with the scheme. The comparative studies are carried out for training of weights for ANN networks with SA, PS, GA, PSO, GA hybrid with SA (GA-SA), GA hybrid with PS (GA-PS), PSO hybrid with SA (PSO-SA) and PSO hybrid with PS (PSO-PS) algorithms. It is found that the GA-SA, GA-PS, PSO-SA and PSO-PS hybrid approaches are the best stochastic optimizers. The comparison of results is made with available exact solution, approximate analytic solution and standard numerical solvers. It is found that in most of the cases the design scheme has produced the results in good agreement with state of art numerical solvers. The advantage of our approach over such solvers is that it provides the solution on continuous time inputs with finite interval instead of predefine discrete grid of inputs. The other perk up of the scheme in its simplicity of the concept, ease in use, efficiency, and effectiveness.