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This paper presents new upper bounds for binary covering arrays of variable strength constructed by using a new Simulated Annealing (SA) algorithm. This algorithm incorporates several distinguished features including an efficient heuristic to generate good quality initial solutions, a compound neighborhood function which combines two carefully designed neighborhoods and a fine-tuned cooling schedule...
Timetabling is a problem that arises in many application areas such as telecommunications. Call-center enterprises are companies that search for schedules that minimize the resources spent to attend customer calls. Given that the constraints to create an acceptable schedule vary from one call center to another, it is not possible to find a polynomial time algorithm that fits the requirements of all...
One of the primary tools for performance analysis of multi-tier systems are standardized benchmarks. They are used to evaluate system behavior under different circumstances to assess whether a system can handle real workloads in a production environment. Such benchmarks are also helpful to resolve situations when a system has an unacceptable performance or even crashes. System administrators and developers...
Current Web servers are highly multithreaded applications whose scalability benefits from the current multi-core/multiprocessor trend. However, some workloads cannot capitalize on this because their performance is limited by the available memory and/or the disk bandwidth, which prevents the server from taking advantage of the computing resources provided by the system. To solve this situation we propose...
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