Andrzej Karbowski

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The main purpose of this paper is to describe the design, implementation and possibilities of our object-oriented library of algorithms for dynamic optimization problems. We briefly present library classes for the formulation and manipulation of dynamic optimization problems, and give a general survey of solver classes for unconstrained and constrained(More)
This paper indicates two errors in the formulation of the main optimization model in the article " Dynamic power management in energy-aware computer networks and data intensive computing systems " by Niewiadomska-Szynkiewicz et al. and shows how to fix them.
—We present a very simple, free tool for parallelizing calculations under Matlab in multicore and cluster environments. After the installation it does not use any compilers, MEX files, disk files, etc. It is compatible with the old Paralize package, but allows the involved cores/machines to do other jobs when a worker core/machine is not busy.
— This paper presents a newly deployed server, IDOS (Interactive Dynamic Optimization Sever), devoted to solving optimal control problems. Development and deployment of the Interactive Dynamic Optimization Server is a result of a project funded by NCBiR (National Center for Research and Development in Poland). The aim of the project was to develop a(More)
—Efforts to reduce power consumption in telecom-munication networks follow in two mutually related directions – design of a more efficient equipment and development of energy-aware network control strategies and protocols. The paper presents a formulation of two-criteria traffic engineering problem, which takes advantage of energy saving capabilities in(More)
The article proposes a two-layered system for distributed computation. The setup combines two different tools - Globus and Mosix - in order to harness the computing power wasted in unused student laboratories. The system is easy to set up and use. We present the results of experiments on a simple testbed, using the Google PageRank algorithm as an example(More)
—A cross-layer network optimization problem is considered. It involves network and transport layers, treating both routing and flows as decision variables. Due to the non-convexity of the capacity constraints, when using Lagrangian relaxation method a duality gap causes numerical instability. It is shown that the rescue preserving separability of the(More)
Due to the physical processor frequency scaling constraint, current computer systems are equipped with more and more processing units. Therefore, parallel computing has become an important paradigm in the recent years. AMPL is a comprehensive algebraic modeling language for formulating optimization problems. However, AMPL itself does not support defining(More)