Feedback force is very important for novices to simulate tooth preparation by using the haptic interaction system (dental training system) in a virtual environment. In the process of haptic simulation, the fidelity of...
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A multi-metric QoS Routing Protocol (MQOLSR) is proposed in this paper, which providing different QoS for different applications flow in an ad hoc network. The protocol, which integrates QoS measurement and packet for...
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It is a challenging task to provide real-time, realistic 3D graphics on mobile devices because of the constraints of computing, storage and network bandwidth. In this paper, we first overview current researches of 3D ...
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The modeling and rendering of real material properties highly rely on precise data acquisition. However, it is fairly hard to gather and model the Bidirectional Reflectance Distribution Function (BRDF), which indicate...
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virtual stiffness is a critical performance measure for haptic devices. This paper proposes a new controller to increase the virtual stiffness. The design of the controller is based on theoretical analysis of the syst...
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virtual stiffness is a critical performance measure for haptic devices. This paper proposes a new controller to increase the virtual stiffness. The design of the controller is based on theoretical analysis of the system stability condition, which indicates that by adding a current closed loop the stability can be increased. We implemented the current closed loop controller with a first order filter and a PID control law. With properly selected parameters of the filter and the PID controller, it is possible to increase the maximum achievable virtual stiffness. Experimental results demonstrate the effectiveness of the proposed method.
Shadow mapping is an efficient algorithm for real-time shadow rendering. This algorithm is image based. When a shadow map with limited resolution maps in to a large virtual scene, it will suffer from the aliasing erro...
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This paper presents an approach for compression and synthesis of BTF (Bidirectional Texture Function), and using it BTF can be mapped on arbitrary surfaces. BTF is a kind of multidimensional texture data, which can pe...
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A multimetric QoS routing protocol (MQOLSR) is proposed in this paper, which providing different QoS for different applications flow in an ad hoc network. The protocol, which integrates QoS measurement and packet forw...
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A multimetric QoS routing protocol (MQOLSR) is proposed in this paper, which providing different QoS for different applications flow in an ad hoc network. The protocol, which integrates QoS measurement and packet forwarding, expands the topology discovery and routing computing mechanism of the OLSR protocol. It can provide different routing and forwarding service according to different application flow. The experimental results show that the MQOLSR protocol improves the network performance. Compared to the traditional OLSR protocol, the proposed routing protocol increases network throughput by 31.8% and reduces delay jitter when transmitting IPTV, while its routing overhead and routing discovery time are within an acceptable range.
The region coverage is an important affecting factor of target detection performance in wireless video sensor networks (WVSN). However, the traditional region coverage can not estimate the target detection performance...
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The region coverage is an important affecting factor of target detection performance in wireless video sensor networks (WVSN). However, the traditional region coverage can not estimate the target detection performance properly, so the concept of Effective Coverage is introduced in this paper, which can be considered as the equivalent of target detection performance. Moreover, we propose an effective coverage-enhancing approach for video sensor networks based on virtual forces and the directional sensing model. This approach provides a unified modeling of both sensor node and special area, and defines different states of sensor nodes, including free and restraint state. On this basis, the state switch mechanism and selfadaptive adjusting algorithm in the corresponding models are presented to achieve the target detection performance enhancing indirectly. Simulation results are also presented to demonstrate the performance of these algorithms.
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