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With the development of aerospace manufacturing automation, the demand for high-precision welding robot is increasing. The analysis method of robot pose error is the key technology to improve the accuracy. This paper presents a method of analyzing the robot posture error by using flexible mechanics theory combined with ADAMS virtual prototype technology, which the elastic deformation of the link arm...
Cloud computing is a recently developed new technology for complex systems with massive service sharing, which is different from the resource sharing of the grid computing systems. In a cloud environment, service requests from users go through numerous provider-specific steps from the instant it is submitted to when the requested service is fully delivered. Quality modeling and analysis of clouds...
In the cloud computing paradigm, periodical rejuvenation serves as a preventive measure consolidates robustness and performance through refreshing cloud data-centers or machines. Another factor that influences system performance is VM migration, which transports VMs from a physical machine to another. In this work, we propose a comprehensive framework to model and evaluate performance and energy consumption...
To improve the BDS positioning precision, the model of the BDS static positioning errors is presented by using time series analysis. The error series is verified to be non-stationary, so the non-stationary components, including the trend component and the periodic component, should firstly be extracted, and then we can build an AR (2) model to fit the residual stationary random component, parameters...
Based on physical properties of peritoneal membrane tissue, Mass Spring Model, which is fit for simulating the deformation of peritoneal membrane tissue in virtual surgery, is built in the paper. Then three numerical solution methods of this model are compared and analyzed to furthur put forward another simulating and modeling method, which is more reasonable and reliable. Also, problems of new model's...
In this paper, we design and analyze a new 802.11- based cooperative MAC protocol. Since the wireless fading interval sometimes is comparable to the time of multiple-frame transmission, the traditional retransmission schemes may not be optimal. We consider designing a multi- relay system where neighbor nodes can assist the retransmission in order to achieve transmission diversity and combat channel...
As the largest wetland with the highest elevation located in urban region, the Lhasa Lhalu wetland is chosen as a typical area in this research. The wetland is regarded as “The Lung of Lhasa City” due to its outstanding ecological benefits. It will become more efficient and reasonable for the protection of wetland eco-environment by applying the principle and method of ecohydrology to set a series...
A multi-link cooperative polling scheme for Unmanned Aerial Vehicle Data Link (UAV-DL) is proposed to improve the throughput and reduce the average delay. Markov model of flight States for UAV-DL, Gilbert-Elliot channel model and different priorities for multi-link network are used in the scheme. The key of the scheme is that the high priority notes are polled by master site with main network and...
Recent development in IntelliDrive and associated Vehicular Ad Hoc Networks (VANET) has stimulated tremendous interests among decision-makers, practitioners, and researchers due to the potential safety and mobility benefits provided by these technologies. A primary concern regarding the deployment of IntelliDrive is degree of market penetration required for effectiveness. This paper proposes an approach...
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