Many multicast video streaming algorithms have been proposed to provide scalable streaming media services, but they are designed for homogeneous clients, i.e., users are assumed to have the same receiving bandwidth. T...
详细信息
ISBN:
(纸本)9781424424238
Many multicast video streaming algorithms have been proposed to provide scalable streaming media services, but they are designed for homogeneous clients, i.e., users are assumed to have the same receiving bandwidth. The performance of these state-of-the-art algorithms will degrade significantly in user heterogeneous environment. A scheme, called the Enhanced Patching, is proposed to support user heterogeneity. Both the optimal threshold window and the average bandwidth are analyzed. A simple but efficient analytical model is also proposed to evaluate the distribution of the capacity demanded by the clients. The numerical results show the feasibility of the proposed scheme.
The magnitude of output torque in a BLdC (brushless dC) motordepends on torque angle so that the exact initial position of rotor is essentially required for good starting performance. This paperdescribes starting pe...
详细信息
ISBN:
(纸本)9781424424900
The magnitude of output torque in a BLdC (brushless dC) motordepends on torque angle so that the exact initial position of rotor is essentially required for good starting performance. This paperdescribes starting performance for smooth starting in position sensorless BLdC motordrives forreciprocating compressor of refrigerator. In addition, position of rotor is determined from current response characteristics at align mode and level of the measured phase currents at the open-loop acceleration mode. The experimental results have suggested the effectiveness of starting method as starting load variations of reciprocating compressor.
A scheme, called the Enhanced Patching (EPatching), is proposed to support user heterogeneity. Both the optimal threshold window and the average bandwidth are analyzed. A simple but efficient analytical model is also ...
详细信息
Understanding the topology of large scale IPv6 networks is essential to the procurement of good architectural design decisions, particularly with respect to address allocation anddistribution schemes. The formerdist...
详细信息
ISBN:
(纸本)9781424442348
Understanding the topology of large scale IPv6 networks is essential to the procurement of good architectural design decisions, particularly with respect to address allocation anddistribution schemes. The formerdistributed topology discovery applications deploy multiple probing hosts throughout the network. This approach relies on the ability to deploy probing hosts throughout the network, which in many cases is not possible. Source routing support in IPv6 routers is a mandated feature and hence mostly enabled. With respect to simple traceroute, source routing allows one to discover paths between arbitrary pairs of network nodes, but it is such difficult to avoid probing redundancy with a null probing stopping set in the initial phrase of discovery. This paper presents two probing systems: VdPS (virtual distributed Probing system) and SrPS (Source routing Probing system). Firstly, VdPS discovers the BTI (Basic Topology Information) of IPv6 networks. Secondly, SrPS selects seeds from the BTI. In the processing of SrPS, it is very effective in avoiding probing redundancy rely on the probing stopping set initiated by the BTI. Finishing the implementation of SrPS, the coverage of probing is increased greatly. We also present some initial results from probing the CErNET2, currently the largest public IPv6 network of China. The results illustrate the effectiveness of coverage and avoiding probing redundancy.
This paper presents the M/G/1 multi-class open queuing networks performance model of IXP2400-based VoIP SPS (signaling parse system). We use UML activity diagrams and function module diagrams to describe this VoIP SYS...
详细信息
ISBN:
(纸本)9781424442317
This paper presents the M/G/1 multi-class open queuing networks performance model of IXP2400-based VoIP SPS (signaling parse system). We use UML activity diagrams and function module diagrams to describe this VoIP SYS, andderive the performance model. The resulting model could make statistic analysis of IXP2400-based VoIP SPS with First-Come-First-Seine (FCFS) scheduling policy and mix traffic. We use the approximate calculation of iterative decomposition algorithm to solve this model, and present the formulas of the utilization, delay, etc. The theoretical estimates are in excellent consistence with our testing data, this shows the effectiveness of our performance evaluating method.
Congestion is a natural phenomenon in any network queuing system, and is unavoidable if the queuing system is operated near capacity. In this paper, we study how to set rules of a satellite queuing system so that all ...
详细信息
According to the standard andtechnology of the network host identifying and access controlling and to strategy of the next generation network real-name identifying, a host real-name architecture based on the HIP prot...
详细信息
Many multicast video streaming algorithms have been proposed to provide scalable streaming media services, but they are designed for homogeneous clients, i.e., users are assumed to have the same receiving bandwidth. T...
详细信息
Many multicast video streaming algorithms have been proposed to provide scalable streaming media services, but they are designed for homogeneous clients, i.e., users are assumed to have the same receiving bandwidth. The performance of these state-of-the-art algorithms will degrade significantly in user heterogeneous environment. A scheme, called the Enhanced Patching, is proposed to support user heterogeneity. Both the optimal threshold window and the average bandwidth are analyzed. A simple but efficient analytical model is also proposed to evaluate the distribution of the capacity demanded by the clients. The numerical results show the feasibility of the proposed scheme.
Stream merging techniques utilize multicast to minimize the serverresource consumption. However, how waiting requests are scheduled for service in the context of stream merging has not been studied extensively. The I...
详细信息
Stream merging techniques utilize multicast to minimize the serverresource consumption. However, how waiting requests are scheduled for service in the context of stream merging has not been studied extensively. The Improved Maximum Urgency First (IMUF) scheduling algorithm for video servers applying stream merging is proposed. IMUF considers multiple attributes of the video waiting queue. Three heuristic implementation schemes are presented: IMUF-I, IMUF-P and IMUF-M. The proposed implementations are compared and evaluated through extensive simulation. results show that IMUF can yield significant performance benefits in terms of defection rates, average access delay and fairness.
With Peer-to-Peer (P2P) technology widely applied, P2P network have become an attacked target of viruses and other malicious code. Among them, pollution attacking of resource is one of most serious threat to P2P file ...
详细信息
暂无评论