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There has been a high concern regarding the energy saving on mobile devices recently, for mobile devices have been performing increasingly complex tasks over time. The computation offloading is one of the most popular techniques used by developers as an effective way of saving energy on mobile devices, which consists on executing complex tasks in external servers with different purposes including...
Consumption charge on electricity is one of the issues faced by dormitories, room for rent, apartment and the like. Ideally, tenants must only pay what they have used for a specific period of time, but inevitably sometimes, they pay beyond their actual use simply because of unavailability of a meter or machine that could measure their actual use individually. Due to this practice and the current scheme...
The elastic provisioning of Virtual Infrastructures (VIs) enables a dynamic management of cloud resources (computing and communication) in order to meet the hosted application's requirements. Thus, to perform elasticity requests, providers usually rely on reallocation mechanisms and policies. The concerns regarding the environment and the operational costs indicate energy consumption of the data centers...
Mobile applications are usually developed in a native way, using languages and APIs specific for a given platform, hindering the portability. As an alternative, web technologies as JavaScript and PHP have been employed enabling a same implementation to be executed in different mobile platforms without any recompilation or recoding process. This paper compares the efficiency of Android applications...
Cooling systems consume around 40% of modern data centres' total energy consumption, thus reducing the energy waste in this sector will have positive environmental impact. There exist several cooling methods appropriate for particular conditions. Since environmental conditions, such as air temperature, change on seasonal bases, no single cooling method can be claimed to be the best. In contrast, data...
With the recent emergence of smartphones, cloud computing, and the Internet of Things (IoT), our society has become more dependent on the Internet. In these circumstances, increasing energy consumption in data centers is becoming a crucial problem worldwide and data center managers are required to run them efficiently in terms of energy consumption. This study aims to reduce cooling airflow energy...
More and more cyber-physical systems and the internet of things push for a multitude of devices and systems, which need to work together to provide the services as required by the users. Nevertheless, the speed of development and the heterogeneity of devices introduces considerable challenges in the development of such systems. This paper describes a solution being implemented in the setting of a...
The distinguishing feature of the Fog Computing (FC) paradigm is that FC spreads communication and computing resources over the wireless access network, so as to provide resource augmentation to resource and energy-limited wireless (possibly mobile) devices. Since FC would lead to substantial reductions in energy consumption and access latency, it will play a key role in the realization of the Fog...
In this work, a detailed experimental characterization of GPRS and 3G data transmission energy consumption, in a custom Remote Telemetry Unit (RTU) is presented. This comparison results valuable for the design of low data-rate, battery-powered, RTUs until reliable and wide spread IoT networks specifically developed for this type of application in suburban areas are available (probably not before 2...
During the last decades the growing demand for computer infrastructures and software has led to important increased in the number and the dimension of data centers. The energy used by the data centers (here are included the power for IT equipment and the power for the cooling infrastructure) has increased dramatically. The paper proposes an analysis of Power Usage Effectiveness (PUE), the classical...
Smart metering is one of the main objectives for the EU member states to ensure the benefit of consumers on the long term. Due to its functionality, smart meters have a wide applicability in: power quality monitoring, energy savings, data awareness and fraud detection. With long-term cost benefits of the smart meters, it is expected that 72% of European consumers will have a smart meter for electricity...
This contribution shows how rationalized energy consumption can be achieved using user-oriented mobile application. It is undoubtable that energy efficiency improvement is one of the most important targets to be achieved on every society as a whole and in power system in particular. With the advent of smart grids, residential end users are expected to shift from their passive role as consumers of...
This paper designs a multifunctional remote-controllable home system based load aggregation management system. On the one hand, this system combines the Load Aggregators with Smart Home and presents an effective and practical method to realize household load management. When the household loads are needed to adjust by load aggregators, the system can automatically control the load on the user side...
In the US alone, data centers consumed around $20 billion (200 TWh) yearly electricity in 2016, and this amount doubles itself every five years. Data storage alone is estimated to be responsible for about 25% to 35% of data-center power consumption. Servers in data centers generally include multiple HDDs or SSDs, commonly arranged in a RAID level for better performance, reliability, and availability...
The extreme growth in deployment of cloud based services along with applications requiring high computational complexity has had an adverse effect on energy consumption in data centers. When cloud data centers add more computing capacity and increase in size, they generate more heat, require extra cooling. To counter this effect, energy dissipation must be reduced. Servers consume power even when...
One technique of solving energy consumption and performance issues in virtualized data centers consists in migrating the virtual machines between the physical hosts, in order to achieve either resource consolidation or load balancing. These migrations, however, may degrade the performance of the virtualized applications and of the servers and network involved in the migration process. A possible solution...
The energy consumption of data centers has been increasing continuously during the last years due to the rising demands of computational power especially in current Grid- and Cloud Computing systems, which directly influence the increment in operational costs as well as carbon dioxide (CO2) emission. To reduce energy consumption within the cloud data center, it required energy-aware virtual machines...
Cloud computing is underpinned by huge datacenters which are considered as significant consumers of energy. Under the umbrella term GreenCloud the scientific community developed different architectures, algorithms and methods to improve energy efficiency of these datacenters. However, approaches which try to modify existing or applying new economical concepts to improve energy efficiency of datacenters...
Hybrid Clouds couple the scalability of public Clouds with the greater control supplied by private ones. Hybrid Cloud Brokers support customers in selecting the most suitable providers' offers, optionally adding the provisioning of dedicated services with higher Quality of Service (QoS) levels. A clear evaluation of the benefits on performance and energy savings brought about by any allocation strategy...
We study the optimum scheduling of a pushing-based information delivery system, where information is sent from a server to mobile users by using server-initiated pushing actions. Information arrives at the server at random. The server adopts a “hold-then-serve” strategy, where new information is temporarily stored in queue for a later one-time transmission. Based on the current queue status, at any...
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