Energy efficient Research Papers - Academia.edu (original) (raw)

We acknowledge financial support from the research programme ‘Environmental Policy, Economic Reform and Endogenous Technology’, funded by the Netherlands Organisation for Scientific Research (NWO). We gratefully acknowledge useful... more

We acknowledge financial support from the research programme ‘Environmental Policy, Economic Reform and Endogenous Technology’, funded by the Netherlands Organisation for Scientific Research (NWO). We gratefully acknowledge useful comments by Egbert Jongen, Richard Nahuis, Michiel de Nooij and Bob van der Zwaan on an earlier version of this paper. Of course, the usual disclaimer applies. Research Memorandum 0105

One of the major applications of underwater acoustic sensor networks (UWASN) is ocean environment monitoring. Employing data mules is an energy efficient way of data collection from the underwater sensor nodes in such a network. A data... more

One of the major applications of underwater acoustic sensor networks (UWASN) is ocean environment monitoring. Employing data mules is an energy efficient way of data collection from the underwater sensor nodes in such a network. A data mule node such as an autonomous underwater vehicle (AUV) periodically visits the stationary nodes to download data. By conserving the power required for

The area of prosthetic design has long focused on the lightest and presumably most energy efficient designs of prosthetics. Tests to measure energy efficiency are often time consuming or require expensive metabolic equipment. Therefore,... more

The area of prosthetic design has long focused on the lightest and presumably most energy efficient designs of prosthetics. Tests to measure energy efficiency are often time consuming or require expensive metabolic equipment. Therefore, it has been assumed that lighter designs are better than heavier ones. However, simple measures such as maximum ambulation time have been shown to be useful

A wireless network consisting of large number of small sensors with low-power transceivers. These devices rely on battery power so that; improvement in the energy of these networks becomes important. Wireless sensor network (WSN) require... more

A wireless network consisting of large number of small sensors with low-power transceivers. These devices rely on battery power so that; improvement in the energy of these networks becomes important. Wireless sensor network (WSN) require various power management protocols to reduce the power consumption. In this paper we study that different number of clustering algorithm leads to different network performance on the energy balancing, energy consumption and network lifetime. We propose a Multi-hop Hierarchical Stable Election Protocol (MHSEP) for wireless sensor networks to enhance the network lifetime and avoid the formation of energy holes. Classical clustering protocols assume that all the nodes in a system are equipped with the equal amount of energy and as a result, network cannot take full advantage of the presence of node heterogeneity in system. Our proposed protocol is a heterogeneous-aware protocol to increase the time-interval before the death of first node (we refer to a...

The PyRos technology is a new flash pyrolysis technology that is able to produce a solids-free high-quality bio-oil from wood (saw dust) and biomass residues (jatropha cake, coconut residue, sunflower residue, etc). In this patented... more

The PyRos technology is a new flash pyrolysis technology that is able to produce a solids-free high-quality bio-oil from wood (saw dust) and biomass residues (jatropha cake, coconut residue, sunflower residue, etc). In this patented technology the reactor and the oil vapour cleaning unit are integrated in one cyclonic reactor with a rotating particle separator. Advantages of the PyRos technology are: a compact system, solids-free oil, less contaminants in the oil, lower viscosity, and lower costs. Flash pyrolysis is a thermal conversion process to produce oil from organic feeds (e.g biomass, waste residues, etc). About 45-70% of the (dry) feed can be converted into oil. The process takes place in a few seconds at about 500 °C and atmospheric pressure. The thus produced oil can be used either for power generation or it can be upgraded to a high-quality product for the chemical industry. The PyRos flash pyrolysis technology is a low-cost compact technology that can be used on both sma...

With the technological advancement in body area sensor networks (BASNs), low cost high quality electrocardiographic (ECG) diagnosis systems have become important equipment for healthcare service providers. However, energy consumption and... more

With the technological advancement in body area sensor networks (BASNs), low cost high quality electrocardiographic (ECG) diagnosis systems have become important equipment for healthcare service providers. However, energy consumption and data security with ECG systems in BASNs are still two major challenges to tackle. In this study, we investigate the properties of compressed ECG data for energy saving as an effort to devise a selective encryption mechanism and a two-rate unequal error protection (UEP) scheme. The proposed selective encryption mechanism provides a simple and yet effective security solution for an ECG sensor-based communication platform, where only one percent of data is encrypted without compromising ECG data security. This part of the encrypted data is essential to ECG data quality due to its unequally important contribution to distortion reduction. The two-rate UEP scheme achieves a significant additional energy saving due to its unequal investment of communication energy to the outcomes of the selective encryption, and thus, it maintains a high ECG data transmission quality. Our results show the improvements in communication energy saving of about 40%, and demonstrate a higher transmission quality and security measured in terms of wavelet-based weighted percent root-mean-squared difference.

We present a model of energy consumption in IP networks. Using this model, we identify energy ldquohotspotsrdquo and estimate how energy consumption will grow with increasing network capacity. Todaypsilas Internet uses less than 1% of the... more

We present a model of energy consumption in IP networks. Using this model, we identify energy ldquohotspotsrdquo and estimate how energy consumption will grow with increasing network capacity. Todaypsilas Internet uses less than 1% of the available electricity supply. However, network energy consumption could grow substantially as access rates increase.

Climbing oil prices, increasing demand for energy, and energy supply disruptions have -once again -focused the public interest on energy and energy security issues. In this paper we discuss the power of electronics as a means for... more

Climbing oil prices, increasing demand for energy, and energy supply disruptions have -once again -focused the public interest on energy and energy security issues. In this paper we discuss the power of electronics as a means for addressing current challenges in energy production, distribution, and for using energy more efficiently than today. It is argued that the full power of electronic energy management has yet to be exploited. One reason for this lies in a still largely unutilized opportunity for improving the energy efficiency of systems in many application areas. State-of-the-art electronic control systems will play an ever increasing part in managing energy systems. The realization of the enormous potential of this technology will require new forms of collaboration of the energy and information technology sector and an improved shared vision of public policy makers and the industry.

Distributed power generation is the future trend due to its ability to accommodate variety of renewable/alternative energy sources, its potential to improve the energy efficiency and power system capability, and its promise for power... more

Distributed power generation is the future trend due to its ability to accommodate variety of renewable/alternative energy sources, its potential to improve the energy efficiency and power system capability, and its promise for power reliability and security. Many distributed energy sources exists such solar energy, fuel cell, micro turbine, and wind energy. Distributed power generation concept has been implemented in

Energy sustainability is becoming an increasing issue—or rather “the” issue in our society. Often it is reduced to a purely technical problem. Renewable energies and energy-efficient technologies are developed to solve the problem, but... more

Energy sustainability is becoming an increasing issue—or rather “the” issue in our society. Often it is reduced to a purely technical problem. Renewable energies and energy-efficient technologies are developed to solve the problem, but finally the end-users will “decide” how much and what kind of energy they are going to consume. This article is targeted on showing the environmental psychological