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Routing protocols have been widely used in wired networks. In wireless environment, however, cost function of the protocol needs to be modified. We propose a new cost function for routing protocol which considers the unstable condition of wireless links: Using BER (Bit Error Rate) of a link, a channel capacity is calculated and is called effective bandwidth. Performance analysis using simulation shows...
Pure CuInSe2 nanoparticles with single chalcopyrite phase were prepared at 180-220??C with various solvothermal time using simple and environment-benign precursors of InCl3, CuCl and Se powder in the solvent of ethylenediamine via solvothermal approach. Reaction time as well as temperature was found to be crucial for controlling the size and phase purity of the final product. At 200??C, the second...
In this paper, thin graphene sheet composite have been synthesized and field emission parameters (threshold turn on field, mean field enhancement factor, gammam, and emission uniformity) were studied. Electron microscopy analysis revealed that, composite consists of typically 4-6 graphene layers of thickness 1-2 nm. The field emission mainly occurs via edges and folding edges of graphene sheets. The...
CuSe and InSe nanoparticles were synthesized using organic solution pyrolysis route. The size and shape of nanoparticles depend on synthesis conditions such as reaction time and injecting reagent order. We achieved the synthesis of InSe nanowires with 5 nm width, 10 um length, hexagonal plate with 100 nm side and CuSe spherical nanoparticles with 20-50 nm diameter. Polycrystalline CuInSe2 film were...
A "cognitive robotic engine (CRE)" that generates perceptual and action behaviors to select and collect an optimal set of evidences has been introduced previously by the authors. CRE aims at enabling a robot to be capable of dependable and robust recognition and decision under a high level of uncertainty and ambiguity in perception. This paper improves the performance of CRE based on the...
New materials hold the key to fundamental advances in energy conversion and storage. Nanomaterials in particular offer unique properties or combinations of properties as electrodes and electrolytes in a range of energy devices. Technological improvements in rechargeable solid-state batteries are being driven by an ever-increasing demand for portable electronic devices. Lithium-ion batteries are the...
An approach to identifying a caller or callers by a service robot is presented for a natural interaction with people in a home/office environment. The problem addressed specifically in this paper is how to successfully identify a caller in a cluttered environment with large uncertainties involved in the sensed audio-visual cues. The proposed approach is based on a proposition that the dependability...
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