DSpace Collection: Volume 5 Number 4
http://hdl.handle.net/10525/1624
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MPGN – An Approach for Discovering Class Association Rules
http://hdl.handle.net/10525/1635
Title: MPGN – An Approach for Discovering Class Association Rules<br/><br/>Authors: Mitov, Iliya<br/><br/>Abstract: The article briefly presents some results achieved within the PhD project R1876Intelligent Systems’ Memory Structuring Using Multidimensional Numbered Information Spaces, successfully defended at Hasselt University. The main goal of this article is to show the possibilities of using multidimensional numbered information spaces in data mining processes on the example of the implementation of one associative classifier, called MPGN (Multilayer Pyramidal Growing Networks).<br/><br/>Description: his article presents some of the results of the Ph.D. thesis Class Association Rule MiningUsing MultiDimensional Numbered Information Spaces by Iliya Mitov (Institute of Mathematicsand Informatics, BAS), successfully defended at Hasselt University, Faculty of Science on 15November 2011 in BelgiumA Framework for Design-Time Testing of Service-Based Applications at BPEL Level
http://hdl.handle.net/10525/1634
Title: A Framework for Design-Time Testing of Service-Based Applications at BPEL Level<br/><br/>Authors: Ilieva, Sylvia; Pavlov, V.; Manova, I.; Manova, D.<br/><br/>Abstract: Software applications created on top of the service-oriented architecture (SOA) are increasingly popular but testing them remains a challenge. In this paper a framework named TASSA for testing the functional and non-functional behaviour of service-based applications is presented. The paper focuses on the concept of design time testing, the corresponding testing approach and architectural integration of the consisting TASSA tools. The individual TASSA tools with sample validation scenarios were already presented with a general view of their relation. This paper’s contribution is the structured testing approach, based on the integral use of the tools and their architectural integration. The framework is based on SOA principles and is composable depending on user requirements.Integer Programming Approach to HP Folding
http://hdl.handle.net/10525/1633
Title: Integer Programming Approach to HP Folding<br/><br/>Authors: Yanev, N.; Milanov, Peter; Mirchev, I.<br/><br/>Abstract: One of the most widely studied protein structure prediction models is the hydrophobic-hydrophilic (HP) model, which explains the hydrophobic interaction and tries to maximize the number of contacts among hydrophobic amino-acids. In order to find a lower bound for the number of contacts, a number of heuristics have been proposed, but finding the optimal solution is still a challenge. In this research, we focus on creating a new integer programming model which is capable to provide tractable input for mixed-integer programming solvers, is general enough and allows relaxation with provable good upper bounds. Computational experiments using benchmark problems show that our formulation achieves these goals.Theoretical Hyperbolic Model of a Partial Agonism: Explicit Formulas for Affinity, Efficacy and Amplification
http://hdl.handle.net/10525/1632
Title: Theoretical Hyperbolic Model of a Partial Agonism: Explicit Formulas for Affinity, Efficacy and Amplification<br/><br/>Authors: Milanov, Peter; Pencheva, Nevena<br/><br/>Abstract: The quantitative analysis of receptor-mediated effect is based on experimental concentration-response data in which the independent variable, the concentration of a receptor ligand, is linked with a dependent variable, the biological response. The steps between the drug–receptor interaction and the subsequent biological effect are to some extent unknown. The shape of the fitting curve of the experimental data may give some in-sights into the nature of the concentration–receptor–response (C-R-R) mechanism. It can be evaluated by non-linear regression analysis of the experimental data points of the independent and dependent variables, which could be considered as a history of the interaction between the drug and receptors. However, this information is not enough to evaluate such important parameters of the mechanism as the dissociation constant (affinity) and efficacy. There are two ways to provide more detailed information about the C-R-R mechanism: (i) an experimental way for obtaining data with new orInteractive 3D Visualization of Bézier Curves using Java Open Graphics Library (JOGL)
http://hdl.handle.net/10525/1631
Title: Interactive 3D Visualization of Bézier Curves using Java Open Graphics Library (JOGL)<br/><br/>Authors: Vlachkova, Krassimira; Boikova, Marina<br/><br/>Abstract: We present a new program tool for interactive 3D visualization of some fundamental algorithms for representation and manipulation ofBézier curves. The program tool has an option for demonstration of one of their most important applications - in graphic design for creating letters by means of cubic Bézier curves. We use Java applet and JOGL as our main visualization techniques. This choice ensures the platform independency of the created applet and contributes to the realistic 3D visualization. The applet provides basic knowledge on the Bézier curves and is appropriate for illustrative and educational purposes. Experimental results are included.A Super-Dimension Approach in ROLAP Environments
http://hdl.handle.net/10525/1630
Title: A Super-Dimension Approach in ROLAP Environments<br/><br/>Authors: Naydenova, Ina<br/><br/>Abstract: Often the designer of ROLAP applications follows up with the question “can I create a little joiner table with just the two dimension keysand then connect that table to the fact table?” In a classic dimensional model there are two options - (a) both dimensions are modeled independently or (b) two dimensions are combined into a super-dimension with a single key. The second approach is not widely used in ROLAP environments but it is an important sparsity handling method in MOLAP systems. In ROLAP this design technique can also bring storage and performance benefits, although the model becomes more complicated. The dependency between dimensions is a key factor that the designers have to consider when choosing between the two options. In this paper we present the results of our storageand performance experiments over a real life data cubes in reference to these design approaches. Some conclusions are drawn.