Πλοήγηση ανά Θέμα "Heuristic methods"
Αποτελέσματα 1-20 από 24
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3DQoE-Oriented and energy-efficient 2D plus depth based 3D video streaming over centrally controlled networks
(2018)IP networks have become the dominant platform for video delivery. However, bandwidth-hungry video is pushing networks to their limits: costs are rising for the operators and the viewing experience is not always satisfactory ... -
Alloy Design Based on Computational Thermodynamics and Multi-objective Optimization: The Case of Medium-Mn Steels
(2017)A new alloy design methodology is presented for the identification of alloy compositions, which exhibit process windows (PWs) satisfying specific design objectives and optimized for overall performance. The methodology is ... -
Bilevel programming solution algorithms for optimal price-bidding of energy producers in multi-period day-ahead electricity markets with non-convexities
(2021)We consider the problem of devising optimal price-offers (bids) for an energy producer participating in a multi-period day-ahead electricity market which exhibits non-convexities due to the discrete nature of the generation ... -
Carrier assignment algorithms for OFDM-based multi-carrier wireless networks with channel adaptation
(2008)We study carrier assignment in a single-cell multiuser OFDM multi-carrier system so as to satisfy user rate requirements with minimal resources. Different users experience different quality in different carriers due to ... -
Continuous replica placement schemes in distributed systems
(2005)The Replica Placement Problem (RPP) aims at creating a set of duplicated data objects across the nodes of a distributed system in order to optimize certain criteria. Typically, RPP formulations fall into two categories: ... -
Cross-layer energy-aware topology control through Simulated Annealing for WSNs
(2016)In this paper, we optimize the energy consumption and node placements of a wireless sensor network (WSN) using Simulated Annealing (SA). We propose an energy-aware optimization of the power control, the packet transmission ... -
Energy-aware joint power, packet and topology optimization by simulated annealing for WSNs
(2013)Energy-aware connectivity in wireless sensor networks (WSNs) can increase their network lifetime. This can be achieved by optimizing the power control, a particular communication mechanism and the topology control. To this ... -
Evolutionary fuzzy multi-objective routing for wireless mobile ad hoc networks
(2004)The complexity involved in implementing multi-objective routing in computer networks has led to many researchers exploring alternate solutions with the use of heuristic based techniques. The rationale underlying the use ... -
An exact solution algorithm for maximizing the fleet availability of an aircraft unit subject to flight and maintenance requirements
(2013)Flight and Maintenance Planning (FMP) of mission aircraft addresses the question of which available aircraft to fly and for how long, and which grounded aircraft to perform maintenance operations on, in a group of aircraft ... -
A heuristic approach for overlay content-caching network design in 5G wireless networks
(2016)With a wide variety of mobile applications and social networks, there is a growing demand for anytime, anywhere access to high quality video and other multimedia content. Fifth generation wireless networks are aiming to ... -
Implementing replica placements: Feasibility and cost minimization
(2007)Given two replication schemes Xold and Xnew, the Replica Transfer Scheduling Problem (RTSP) aims at reaching Xnew, starting from Xold, with minimal implementation cost. In this paper we generalize the problem description ... -
Improved genetic algorithms and list scheduling techniques for independent task scheduling in distributed systems
(2007)Given a set of tasks with certain characteristics, e.g., data size, estimated execution time and a set of processing nodes with their own parameters, the goal of task scheduling is to allocate tasks at nodes so that the ... -
Investigating the replica transfer scheduling problem
(2006)The Replica Placement Problem (RPP) aims at selecting the nodes for duplicating data objects in order to optimize their access. Even though a lot of work already exists on RPP, the issue of implementing the resulting ... -
Joint QoS multicast power / admission control and base station assignment: A geometric programming approach
(2008)The joint power control and base station (BS) assignment problem is considered under Quality-of-Service (QoS) constraints. If a feasible solution exists, the problem can be efficiently solved using existing distributed ... -
MapReduce algorithms for the k group nearest-neighbor query
(2019)Given two datasets of points (called Query and Training), the Group (K) Nearest Neighbor (GNN) query retrieves (K) points of the Training dataset with the smallest sum of distances to every point of the Query one. This ... -
Medium-Term Unit Commitment in a pool market
(2011)We consider a mandatory pool, based to the one established in the Greek electricity market, in which the unit commitment and the scheduling of energy and reserves are the solution of Day-Ahead Scheduling (DAS), an optimization ... -
A methodology for computing time-dependent alternate routes around freeway incidents
(2005)This article introduces an approach that produces dynamic control strategies in the form of alternate routes around freeway incidents in response to the prevailing traffic conditions. The approach consists of a System ... -
National survey of morbidity and risk factors (EMENO): Protocol for a health examination survey representative of the adult Greek population
(2019)Background: Main causes of death in Greece are cardiovascular diseases (CVDs), malignant neoplasms, respiratory diseases, and road traffic crashes. To assess the population health status, monitor health systems, and adjust ... -
On the Wireless Network Coding with overhearing and index coding
(2013)We study the problem of Wireless Network Coding with imperfect overhearing, a joint coding/scheduling problem that arises naturally in multihop wireless networks. We map this problem to specific instances of index coding. ... -
Optimal jamming attacks and network defense policies in wireless sensor networks
(2007)We consider a scenario where a sophisticated jammer jams an area in a single-channel wireless sensor network. The jammer controls the probability of jamming and transmission range to cause maximal damage to the network in ...