1,252 research outputs found
Improving Routing Efficiency through Intermediate Target Based Geographic Routing
The greedy strategy of geographical routing may cause the local minimum
problem when there is a hole in the routing area. It depends on other
strategies such as perimeter routing to find a detour path, which can be long
and result in inefficiency of the routing protocol. In this paper, we propose a
new approach called Intermediate Target based Geographic Routing (ITGR) to
solve the long detour path problem. The basic idea is to use previous
experience to determine the destination areas that are shaded by the holes. The
novelty of the approach is that a single forwarding path can be used to
determine a shaded area that may cover many destination nodes. We design an
efficient method for the source to find out whether a destination node belongs
to a shaded area. The source then selects an intermediate node as the tentative
target and greedily forwards packets to it, which in turn forwards the packet
to the final destination by greedy routing. ITGR can combine multiple shaded
areas to improve the efficiency of representation and routing. We perform
simulations and demonstrate that ITGR significantly reduces the routing path
length, compared with existing geographic routing protocols
Facile synthesis and enhanced visible light photocatalytic activity of N and Zr co-doped TiO2 nanostructures from nanotubular titanic acid precursors
Zr/N co-doped TiO2 nanostructures were successfully synthesized using
nanotubular titanic acid (NTA) as precursors by a facile wet chemical route and
subsequent calcination. These Zr/N-doped TiO2 nanostructures made by NTA
precursors show significantly enhanced visible light absorption and much higher
photocatalytic performance than the Zr/N-doped P25 TiO2 nanoparticles. Impacts
of Zr/N co-doping on the morphologies, optical properties, and photocatalytic
activities of the NTA precursor-based TiO2 were thoroughly investigated. The
origin of the enhanced visible light photocatalytic activity is discussed in
detail.Comment: 8 pages, 7 figure
Enhancement of Visible-Light-Induced Photocurrent and Photocatalytic Activity of V and N Codoped TiO2 Nanotube Array Films
Highly ordered TiO2 nanotube arrays (TNAs) codoped with V and N were
synthesized by electrochemical anodization in association with hydrothermal
treatment. The samples were characterized by field emission scanning electron
microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The
photocurrent and photocatalytic activity of codoped TiO2 nanotube arrays were
investigated under visible light irradiation. Moreover, the production of
hydroxyl radicals on the surface of visible light-irradiated samples is
detected by a photoluminescence technique using terephthalic acid (TA) as a
probe molecule. It was found that the V+N co-doped TiO2 nanotube arrays showed
remarkably enhanced photocurrent and photocatalytic activity than undoped
sample due to the V and N codoping.Comment: 15 Pages, 6 figure
An Immersive Telepresence System using RGB-D Sensors and Head Mounted Display
We present a tele-immersive system that enables people to interact with each
other in a virtual world using body gestures in addition to verbal
communication. Beyond the obvious applications, including general online
conversations and gaming, we hypothesize that our proposed system would be
particularly beneficial to education by offering rich visual contents and
interactivity. One distinct feature is the integration of egocentric pose
recognition that allows participants to use their gestures to demonstrate and
manipulate virtual objects simultaneously. This functionality enables the
instructor to ef- fectively and efficiently explain and illustrate complex
concepts or sophisticated problems in an intuitive manner. The highly
interactive and flexible environment can capture and sustain more student
attention than the traditional classroom setting and, thus, delivers a
compelling experience to the students. Our main focus here is to investigate
possible solutions for the system design and implementation and devise
strategies for fast, efficient computation suitable for visual data processing
and network transmission. We describe the technique and experiments in details
and provide quantitative performance results, demonstrating our system can be
run comfortably and reliably for different application scenarios. Our
preliminary results are promising and demonstrate the potential for more
compelling directions in cyberlearning.Comment: IEEE International Symposium on Multimedia 201
Analysis of the Dynamical Behavior of Firms in a Three Layered Modular Assembly Model
This paper formulate an option model considers supplier's reaction as the profit sharing in module production, and analyses it by the agent theory. A dynamic environment in the model of the system of the production of modules of three layers is assumed, and the maker and the supplier are modeled by the technique of Genetic Programming (GP) as an agent who takes the action of selfoptimization. As result, the condition that the agent can exist continuously in the market is requested. In conclusion, violent competition and the selection of the similar agent are found even in the model of the option to consider the profit sharing and the reaction
An Immersive Telepresence System using RGB-D Sensors and Head-mounted Display
We present a tele-immersive system that enables people to interact with each other in a virtual world using body gestures in addition to verbal communication. Beyond the obvious applications, including general online conversations and gaming, we hypothesize that our proposed system would be particularly beneficial to education by offering rich visual contents and interactivity. One distinct feature is the integration of egocentric pose recognition that allows participants to use their gestures to demonstrate and manipulate virtual objects simultaneously. This functionality enables the instructor to effectively and efficiently explain and illustrate complex concepts or sophisticated problems in an intuitive manner. The highly interactive and flexible environment can capture and sustain more student attention than the traditional classroom setting and, thus, delivers a compelling experience to the students. Our main focus here is to investigate possible solutions for the system design and implementation and devise strategies for fast, efficient computation suitable for visual data processing and network transmission. We describe the technique and experiments in details and provide quantitative performance results, demonstrating our system can be run comfortably and reliably for different application scenarios. Our preliminary results are promising and demonstrate the potential for more compelling directions in cyberlearning
Enhanced Visible Light Photocatalytic Activity for TiO2 Nanotube Array Films by Codoping with Tungsten and Nitrogen
A series of W, N codoped TiO2 nanotube arrays with different dopant contents
were fabricated by anodizing in association with hydrothermal treatment. The
samples were characterized by scanning electron microscopy, X-ray diffraction,
X-ray photoelectron spectroscopy, and ultraviolet-visible light diffuse
reflection spectroscopy. Moreover, the photocatalytic activity of W and N
codoped TiO2 nanotube arrays was evaluated by degradation of methylene blue
under visible light irradiation.Comment: 8 pages, 5 figure
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