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In this paper, we present an approach to ensure efficient energy distribution among all the nodes in a wireless sensor network by employing mobile chargers from several landmark locations within each sensor cluster with timing constraint. Mobile chargers are considered to use radio frequency signals for the charging purpose and use Hamiltonian cycle to ensure minimum time required to visit landmarks...
A future smart phone will become a mobile terminal that communicates with a number of diverse sensors perpetually. This never-resting RF communication will cut the battery life drastically, unless the power consumption per RF communication reduces accordingly while maintaining reasonable performance. This paper presents the recent evolution of a translational circuit (or N-path filter) to enable a...
Due to the limited battery capacity in mobile devices, the concept of mobile cloud computing (MCC) is proposed where some applications are offloaded from the local device to the cloud for higher energy efficiency. The portion of applications or tasks to be offloaded for remote processing should be judiciously determined. In this paper, the problem of optimal task dispatch, transmission, and execution...
In order to fully exploit the high speed broadband multimedia services, prolonging the battery life of user equipment is critical, especially for the current smartphones. In this work, we investigate the problem of designing a content sharing collaborative mobile cloud (CMC) via user cooperation to reduce the energy consumption at terminal side. Given a group of users interested in downloading the...
Modern mobile devices incorporate rich collection of sensing and communication capabilities allowing the design of diverse range of interactive context aware applications. Intensive use of these resources comes at a cost, typically in the form of reduced battery life. Therefore, limited battery power is one of the major drawbacks of mobile communication and hence managing battery life is an important...
The main problem in Wireless Communication Networks in the field nodes is that the battery resources are constrained. In multi-hop network, if one of the nodes is switched off due to low battery power, the network is disconnected and the field information could be lost. While energy efficiency of communication protocols tries to ensure extended network lifetime, but battery drainage problem still...
Harvesting or scavenging the RF(Radio Frequency) energy, better known by its engineering name — “RF energy Scavenging”, is one of the emerging fields, with very good research opportunities. It is a technique, by which, we utilize the RF energy present in the external atmosphere, by scavenging, and convert it into an useful electrical output for driving a load, either directly, or, indirectly, by storing...
A recent study puts the number of mobile phones in use around the world at an astonishing 5 billion and these numbers are growing rapidly. This places the increase in energy consumption of mobile phones in the world at an alarming level. Wi-Pie or Wireless-Piezoelectric technique combines RF energy scavenging and piezoelectric energy harvesting technologies to provide an alternative method of powering...
Some applications require that the communication link between the master and slave transceivers be maintained for a certain lifetime and be recovered as soon as possible whenever the link is broken. In these cases especially for mobile applications, it is most important to reduce the power consumption for both communication. While the master and slave are in linked status, neither of the receivers...
Zigbee is one of the most exciting wireless sensor network (WSN) technologies for monitoring and control. In our previous research, an integrated Zigbee RFID sensor network was designed as an `all-in-one' system solution for Humanitarian Logistics Center (HLC) resource management. Various field trials, which have justified the feasibility and features of such a system structure, have also revealed...
This demo presents a mobile wireless sensor system for debris flow monitoring. The objective of this system is to realize long-term and effective debris flow surveillance using low cost wireless sensors. In the system, a set of robust wireless sensors are designed to deploy on riverbed and cooperatively observe the moving debris flows. Our mobile sensors are intended to be carried along by the debris...
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