The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Complexity of tsunami modeling requires designing software system with high level of reusability and interoperability of its components, and flexible resource management. In this paper we investigate how to integrate the tsunami modeling software with an agent-based resource management infrastructure.
In this paper, an investigation of the influence of the population size on the genetic algorithm (GA) performance for a model parameter identification problem, is considered. The mathematical model of an E. coli fed-batch cultivation process is studied. The three model parameters - maximum specific growth rate (μmax), saturation constant (kS) and yield coefficient (YS/X) are estimated using different...
In this paper we present a Column Generation approach to the Quadratic Traveling Salesman Problem. Given a graph and a function that maps every pair of edges to a cost, the problem consists in finding a cycle that visits every vertex exactly once and such that the sum of the costs over all pairs of consecutive edges of the cycle is minimum. We propose a Linear Programming formulation that has a variable...
Relativistic numerical hydrodynamics is an important tool in high energy nuclear science. However, such simulations are extremely demanding in terms of computing power. This paper focuses on improving the speed of solving the Riemann problem with the MUSTA-FORCE algorithm by employing the CUDA parallel programming model. We also propose a new approach to 3D finite difference algorithms, which employ...
Fiber To The Home (FTTH) deployment is crucial for telecommunication operators for both economical and quality of service reasons. This paper deals with a real-life Passive Optical Network (PON) design problem focusing on optical cabling constraints. This decision problem is formulated as an integer linear program (ILP) and several solving approaches are designed. Tests performed on real instances...
This paper presents an approach for underdetermined blind source separation that can be applied even if the number of sources is unknown. Moreover, the proposed approach is applicable in the case of separating I+3 sources from I mixtures without additive noise. This situation is more challenging and suitable to practical real world problems. Also, the sparsity conditions are not imposed unlike to...
The extensive use of the Wireless Sensor Networks (WSNs) in main critical scenarios stresses the need to verify their dependability properties at design time to prevent wrong design choices and at runtime in order to make a WSN more robust against failures that may occur during its operation. In literature, several approaches have been proposed in order to evaluate the dependability of a WSN during...
This article focuses on the performance evaluation of the response time for signalling through a home Internet Protocol based Multimedia Subsystem (IMS), separately for each of IMS core nodes (Proxy-Call Session Control Function, Interrogating-CSCF, Serving-CSCF and Home Subscriber Server) and then on the investigation of the trend-line functions and their equations to describe these delays for various...
In the article a new approach for control of a pressure-constrained batch reactor and a new multi-step optimization algorithm were presented. The considered batch reactor was described by both differential and algebraic equations. State constraints incorporate always difficulties into a mathematical model of the reactor, so a new algorithm based on a multiple shooting SQP-line search method was proposed...
The paper presents a concept and the outline of the implementation of a hybrid approach to modeling and solving constrained problems. Two environments of mathematical programming (MP) and logic programming (LP) were integrated. The strengths of integer programming (IP) and constraint logic programming (CLP), in which constraints are treated in a different way and different methods are implemented,...
The principal goal of information technologies application in medicine is improvement and conditioning of medical care. Modern healthcare systems have to perfect the care of a patient. Therefore, the healthcare system has to be characterized, first of all, by high reliability and reliability analysis of such a system is an important problem. The new method for estimation of system reliability is considered...
The paper presents the concept and an outline of the implementation of a hybrid approach to supply chain modeling and optimization. Two environments mathematical programming (MP) and logic programming (LP) were integrated. The strengths of integer programming (IP) and constraint logic programming (CLP), in which constraints are treated in a different way and different methods are implemented, were...
Bullwhip effect (BWE) refers to the accumulation of stock flowing up and down along the supply chain management (SCM). It reduces the operating efficiency of the chain and blocks the operating resources. Some of the common causes of BWE are demand order variations, long lead times, competence defects between supply chain links, lack of communication among links in the chain, etc. There have been efforts...
Petri net modeling has well-known algorithms, so it is easy to develop computer tools to build, edit, and analyse these networks. These tools are designed to be able to add extensions giving additional functionality, such as an extension for evaluation networks.
The inexact Newton method is commonly known from its ability to solve large-scale systems of nonlinear equations. In the paper the classical inexact Newton method is presented as a tool for solving differential-algebraic equations (dae) in fully-implicit form F(ẏ, y, t) = 0. The appropriate statement of dae using the backward Euler method makes the possiblity to see the differential-algebraic system...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.