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A sensor network deployed for long-term monitoring shall sustain meanwhile provide as much useful sensory information (i.e., as high network utility) as possible. We propose a JCRA (Joint Charging and Rate Allocation) scheme to maximize the network utility while satisfying the network sustainability requirement. JCRA is designed based on the observation that the energy repository of a sensor node...
This paper proposes JAM, a Joint Aggregation and MAC design, to improve the sensor network lifetime under the end-to-end delay constraint. The key idea is to adjust both network traffic (via data aggregation) and communication overhead (via duty-cycled MAC) in a holistic manner at each individual node as well as between neighbors. As a result, JAM extends the sensor network lifetime more efficiently...
We present a novel holistic approach (called I2C-Intra-route and Inter-route Coordination) to prolong the sensor network lifetime under the end-to-end delivery delay constraint. I2C is composed of two lifetime balancing modules: (i) the IntraRoute Coordination module that allows the nodes on the same route to balance their nodal lifetimes through adjusting the MAC behaviors collaboratively; (ii) the...
The emerging wireless charging technology creates a controllable and perpetual energy source to provide wireless power over distance. Schemes have been proposed to make use of wireless charging to prolong the sensor network lifetime. Unfortunately, existing schemes only passively replenish sensors that are deficient in energy supply, and cannot fully leverage the strengths of this technology. To address...
In current days, the business environment is more competitive and changing faster than ever before, so it is important for employees to learn new knowledge related to their business quickly and efficiently. Meanwhile, the personalized e-learning system makes it possible for employees to discover a personalized learning path in order to improve the learning efficiency. For business in a company, it...
The chemical modification of coke powder by HNO3 was reported in this paper. The structure and composition of the coke powder were analyzed using scanning electron microscope (SEM), X-ray photoelectron spectroscopy(XPS), X-ray diffraction (XRD). The effect of the HNO3 concentration on the adsorption capability as well as the adsorption kinetics of the modified coke powder was investigated. In the...
In this paper the Duffing oscillator is applied to solve high transmitter power consumption and high probability of intercept of underwater mine. A chaotic oscillator has the property of being sensitive to weak signal and being immune to noise, which leads to a potential application in weak signal detection. The weak signals can be used as the outside periodic exciter and be brought in the Duffing...
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