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.
Datacenters provide flexibility and high performance for users and cost efficiency for operators. However, the high computational demands of big data and analytics technologies such as MapReduce, a dominant programming model and framework for big data analytics, mean that even small changes in the efficiency of execution in the data center can have a large effect on user cost and operational cost...
It is necessary to optimize the energy-efficient (EE) performance for millimeter-wave (mmWave) wireless systems, since the power consumption problem becomes increasingly crucial at high frequency bands. In hybrid precoding mmWave systems, the EE-oriented optimized elements include the analog and digital precoders at the transmitter, the analog and digital combiners at the receiver, as well as the...
We propose a cross layer design that optimizes the energy efficiency of spectrum sharing systems. The energy per good bit (EPG) is considered as an energy efficiency metric. We optimize the secondary user's transmission power and media access frame length to minimize the EPG metric. We protect the primary user transmission via an outage probability constraint. The non-convex targeted problem is optimized...
This research paper focuses on reengineering and optimization of energy consumption and other costs for large IT infrastructures, with support from EA software which is based on advanced use of IT Key Performance Indicators (KPIs) and powerful visualization solutions. Use of KPIs is crucial in achieving energy efficient, green IT, implementing these metrics allows the enterprise to determine areas...
Dynamic churn in overlays is an obvious barrier to gathering collective availability constantly. Despite, a single index was mainly concerned, such as session time or node degree to select most-capable peers in previous works. In this paper, we propose a new utility function in which three metrics, deciding a quality of data dissemination services, are incorporated while considering energy consumption...
Energy efficiency and CO2 awareness are globally-important issues in cloud computing. With increasing attention being paid to the environmental impact of cloud computing there are concerns about the sustainability of cloud computing model as its uptake increases. In this respect, we consider it useful to provide a snapshot of the requirements for energy efficient and CO2 aware cloud computing to allow...
Quality of Experience (QoE) is a widely used metric reflecting the users' satisfaction of the multimedia service. This paper studies the QoE-driven resource allocation technique in the Orthogonal Frequency Division Multiplexing (OFDM) system. Different from other schemes, multiuser-multiservice scenario is taken into consideration for both power allocation and subcarrier scheduling, which is much...
Nowadays mobile operators are planning and designing their mid/long term strategies based on new OFDMA-based cellular technologies such as LTE and WiMAX. Co-siting and re-utilization of existing facilities are within their roadmap in order to keep CAPEX as low as possible. Therefore, the optimization of OFDMA networks subject to fixed/previous (and usually suboptimal) coverage is mandatory. In addition,...
In this paper a realization of the self-growing networks concept is developed by means of an adaptive algorithm that facilitates capacity and energy-efficient performance. The algorithm builds on two aspects of optimisation of the self-growing concept: goal-based optimisation and network-based optimisation. The former aspect elaborates on the performance of a network controlled by multi-objective...
Until recently, link adaptation and resource allocation for communication system relied extensively on the spectral efficiency as an optimization criterion. With the emergence of the energy efficiency (EE) as a key system design criterion, resource allocation based on EE is becoming of great interest. In this paper, we propose an optimal EE-based resource allocation method for the scalar broadcast...
The current trend to move from homogeneous to heterogeneous multi-core systems promises further performance and energy-efficiency benefits. A typical future heterogeneous multi-core system includes two distinct types of cores, such as high performance sophisticated (``large'') cores and simple low-power (``small'') cores. In those heterogeneous platforms, execution phases of application threads that...
Over the last decade, numerous research efforts have been made to develop energy-efficient routing protocols for the Mobile Ad-hoc wireless Networks MANET. However, these energy-efficient protocols have added an overhead on the network and its nodes which could result in overall network performance degradation. In this research paper, a new swarm intelligent routing algorithm inspired from Bees; the...
It is everyone's dream to have network connectivity anywhere at all times. This dream can only be realized provided there are feasible solutions that are put in place for the next generation of wireless works. Wireless Mesh Networks (WMNs) configures itself and because of its cost effectiveness, it is therefore seen as a solution for the next generation networks. However, this field still has a lot...
This paper discusses the possibilities of an energy efficient use of compressed air in pneumatic drives such as cylinders in combination with switching valves. It presents a numerical optimization realization with which an energy optimal open loop control of standard pneumatic systems with switching valves is derived. The main part of air savings results from a better usage of the energy stored in...
Energy efficient computing has become a critical concern in the IT industry. For both hardware manufacturers and software developers, energy management work spans all levels from chips, operating systems, servers, to applications. In this paper, we overview energy-saving techniques developed at hardware, system software, and application levels, with an emphasis on energy-efficient computer servers...
Energy efficiency is increasingly important for wireless cellular systems due to the limited battery resources of mobile clients. While modern cellular standards emphasize low client battery consumption, existing techniques do not explicitly focus on reducing power that is consumed when a client is actively communicating with the network. Based on high data rate demands of modern multimedia applications,...
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.