The Experts below are selected from a list of 9162 Experts worldwide ranked by ideXlab platform
Binqiang Wang - One of the best experts on this subject based on the ideXlab platform.
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load balanced multipath self routing switching structure by concentrators
International Conference on Communications, 2008Co-Authors: Wei He, Hui Li, Bingrui Wang, Qinshu Chen, Peng Yi, Binqiang WangAbstract:A novel two stage load-balanced multipath self-routing switch structure is introduced in this paper. Both stages use a multipath self-routing fabric. With simple algorithms and small buffers, the first stage fabric transforms the Incoming Traffic into uniform and the second stage fabric forwards the data in a self-routing manner to their final destinations. Compared with other similar structures, this structure outstands with no queuing delay and zero jitter, its component complexity and propagation delay are significantly reduced. Mathematical analysis and simulations show this structure can achieve 100% throughput under admissible Traffic pattern, which is a common presumption for Incoming Traffic. For statistically admissible Traffic, by stacking up a few copies of this structure, it is suitable to support QoS application for building super large scale switching fabric in next generation network(NGN).
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ICC - Load-Balanced Multipath Self-Routing Switching Structure by Concentrators
2008 IEEE International Conference on Communications, 2008Co-Authors: Bingrui Wang, Qinshu Chen, Binqiang WangAbstract:A novel two stage load-balanced multipath self-routing switch structure is introduced in this paper. Both stages use a multipath self-routing fabric. With simple algorithms and small buffers, the first stage fabric transforms the Incoming Traffic into uniform and the second stage fabric forwards the data in a self-routing manner to their final destinations. Compared with other similar structures, this structure outstands with no queuing delay and zero jitter, its component complexity and propagation delay are significantly reduced. Mathematical analysis and simulations show this structure can achieve 100% throughput under admissible Traffic pattern, which is a common presumption for Incoming Traffic. For statistically admissible Traffic, by stacking up a few copies of this structure, it is suitable to support QoS application for building super large scale switching fabric in next generation network(NGN).
Bingrui Wang - One of the best experts on this subject based on the ideXlab platform.
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load balanced multipath self routing switching structure by concentrators
International Conference on Communications, 2008Co-Authors: Wei He, Hui Li, Bingrui Wang, Qinshu Chen, Peng Yi, Binqiang WangAbstract:A novel two stage load-balanced multipath self-routing switch structure is introduced in this paper. Both stages use a multipath self-routing fabric. With simple algorithms and small buffers, the first stage fabric transforms the Incoming Traffic into uniform and the second stage fabric forwards the data in a self-routing manner to their final destinations. Compared with other similar structures, this structure outstands with no queuing delay and zero jitter, its component complexity and propagation delay are significantly reduced. Mathematical analysis and simulations show this structure can achieve 100% throughput under admissible Traffic pattern, which is a common presumption for Incoming Traffic. For statistically admissible Traffic, by stacking up a few copies of this structure, it is suitable to support QoS application for building super large scale switching fabric in next generation network(NGN).
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ICC - Load-Balanced Multipath Self-Routing Switching Structure by Concentrators
2008 IEEE International Conference on Communications, 2008Co-Authors: Bingrui Wang, Qinshu Chen, Binqiang WangAbstract:A novel two stage load-balanced multipath self-routing switch structure is introduced in this paper. Both stages use a multipath self-routing fabric. With simple algorithms and small buffers, the first stage fabric transforms the Incoming Traffic into uniform and the second stage fabric forwards the data in a self-routing manner to their final destinations. Compared with other similar structures, this structure outstands with no queuing delay and zero jitter, its component complexity and propagation delay are significantly reduced. Mathematical analysis and simulations show this structure can achieve 100% throughput under admissible Traffic pattern, which is a common presumption for Incoming Traffic. For statistically admissible Traffic, by stacking up a few copies of this structure, it is suitable to support QoS application for building super large scale switching fabric in next generation network(NGN).
Shengkun Xie - One of the best experts on this subject based on the ideXlab platform.
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Impact of source load and routing on QoS of packets delivery
Journal of Computational Science, 2010Co-Authors: Anna T. Lawniczak, Shengkun XieAbstract:Abstract We study how the number of packets in transit (NPT), that is an aggregate measure of a network quality of service (QoS) performance, is affected by routing algorithm coupled with volume of Incoming Traffic. We use our simulation model that is an abstraction of the Network Layer of the OSI Reference Model. We consider a static routing and two different types of dynamic routings and different volumes of Incoming Traffic in the network free flow state. Our study shows that the efficiency of performance of a routing changes with the volume of Incoming Traffic among the considered routings.
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ICCS - Number of packets in transit as a function of source load and routing
Procedia Computer Science, 2010Co-Authors: Anna T. Lawniczak, Shengkun XieAbstract:We study how network performance in delivering packets to their destinations is affected by routing algorithm coupled with volume of Incoming Traffic. We focus our study on the number of packets in transit (NPT) that is an aggregate measure of a network quality of service (QoS) performance. The NPT network performance indicator measures directly the number of packets in the network on their routes to their destinations. We carry out our study using a time-discrete simulation model that is an abstraction of the Network Layer of the ISO OSI Reference Model. This model focuses on packets and their routing. We consider a static routing and two different types of dynamic routings and different volumes of Incoming Traffic in the network free flow state. Our study shows that the efficiency of performance of a routing measured as an average value of the NPT time series and as a variability of this series, changes with the volume of Incoming Traffic among the considered routings. Thus, depending on the volume of Incoming Traffic it is preferable to use one type of routing over the other ones if the objective is to maintain the lowest number of packets in transit and their variability, i.e. the highest QoS network performance.
Lutfi Al-sharif - One of the best experts on this subject based on the ideXlab platform.
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Comprehensive analysis of elevator static sectoring control systems using Monte Carlo simulation
Building Services Engineering Research and Technology, 2018Co-Authors: Lutfi Al-sharif, Zs Yang, Ammar Hakam, Alaa Abd Al-raheemAbstract:For a long time, there was no action that a group controller could take during Incoming Traffic conditions other than returning the elevators back to the main entrance and opening their doors. Pass...
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An integrated framework for elevator Traffic design under general Traffic conditions using origin destination matrices, virtual interval, and the Monte Carlo simulation method:
Building Services Engineering Research and Technology, 2015Co-Authors: Lutfi Al-sharif, Ahmad M Abu AlqumsanAbstract:The conventional design methodology for elevator Traffic analysis has been applied to the case of up-peak Traffic (or Incoming Traffic conditions). The only user requirements are usually the expected arrival rate (AR%) expressed as a percentage of the building population requesting service in the peak 5 min and the target interval. The interval as classically used will be referred to as the physical interval in this paper as it is only relevant for the case of a single entrance and Incoming Traffic conditions. This paper presents an integrated methodology for the design of elevator Traffic systems for the general case of mixed Traffic conditions. It presents a fully integrated framework that covers the steps from user requirements to the selection of the number of required elevators. The user requirements describing the Traffic conditions can be specified by the user, expressed as the AR%, the mix of Incoming Traffic, outgoing Traffic, and interfloor Traffic. This paper derives equations that can be used ...
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Establishing the upper performance limit of destination elevator group control using idealised optimal benchmarks
Building Services Engineering Research and Technology, 2015Co-Authors: Lutfi Al-sharif, Jamal Hamdan, Mohamed Hussein, Zaid Jaber, Mohammad Malak, Anas Riyal, Mohammad Alshawabkeh, Daoud TuffahaAbstract:The concept of an idealised optimal benchmark (IOB) is used in many engineering disciplines. An example of an IOB from the area of thermodynamics is the formula for evaluating the maximum possible efficiency of a heat engine. This paper explores the concept of an IOB in the area of elevator Traffic analysis. It shows that the classical method of elevator Traffic design by calculating the value of the round trip time is an example of an IOB; it also lists the assumptions that lie behind the formulae to illustrate this. It then extends the concept of an IOB to calculating the maximum performance of an elevator system when destination group control is applied under Incoming Traffic conditions. Formulae are derived for finding the minimum values of the expected number of stops (S) and the highest reversal floor (H) under destination group control during Incoming Traffic conditions. The assumption is that the L elevators in the group are sequenced (or rotated) to the L virtual sectors in the building, in order...
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Evaluating the elevator round trip time for multiple entrances and Incoming Traffic conditions using Markov chain Monte Carlo
International Journal of Industrial and Systems Engineering, 2014Co-Authors: Lutfi Al-sharif, Ahmad HammoudehAbstract:The round trip time is the basis for designing elevator systems. There are a number of different methods for calculating the round trip time, whether analytical or numerical. As the building and the conditions of the Traffic become more complicated, analytical methods become intractable. Numerical methods offer an attractive alternative for calculating the round trip time. Monte Carlo simulation has been used to find the value of the round trip time. The use of the Markov chain Monte Carlo method is a viable alternative. This paper derives the formulae necessary to build the transition probability matrix for the elevator during a round trip under Incoming Traffic conditions and multiple entrances. A numerical example is then solved by finding the round trip time using the Markov chain Monte Carlo method and then cross verified by the use of Monte Carlo simulation and the analytical equation based method. Excellent agreement has been found between the three methods, with differences smaller than 0.01%.
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Derivation of a universal elevator round trip time formula under Incoming Traffic
Building Services Engineering Research and Technology, 2013Co-Authors: Lutfi Al-sharif, Ahmad M Abu Alqumsan, Rasha KhaleelAbstract:The design of vertical transportation systems still heavily relies on the calculation of the round trip time (τ). The round trip time (τ) is defined as the average time taken by an elevator to complete a full trip around a building. There are currently two methods for calculating the round trip time: the conventional analytical calculation method and the Monte Carlo simulation method. The conventional analytical method is based on calculating the expected number of stops and the expected highest reversal floor and then substituting the values in the main formula for the round trip time. This method makes some assumptions as to the existence of some special conditions (such as equal floor heights and a single entrance). Where these assumptions are not true in a building, this invalidates the use of the analytical formula the use of which will lead to errors in the result. The conventional analytical equation can be further developed to cover some of the special conditions in the building, but they do not c...
Qinshu Chen - One of the best experts on this subject based on the ideXlab platform.
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load balanced multipath self routing switching structure by concentrators
International Conference on Communications, 2008Co-Authors: Wei He, Hui Li, Bingrui Wang, Qinshu Chen, Peng Yi, Binqiang WangAbstract:A novel two stage load-balanced multipath self-routing switch structure is introduced in this paper. Both stages use a multipath self-routing fabric. With simple algorithms and small buffers, the first stage fabric transforms the Incoming Traffic into uniform and the second stage fabric forwards the data in a self-routing manner to their final destinations. Compared with other similar structures, this structure outstands with no queuing delay and zero jitter, its component complexity and propagation delay are significantly reduced. Mathematical analysis and simulations show this structure can achieve 100% throughput under admissible Traffic pattern, which is a common presumption for Incoming Traffic. For statistically admissible Traffic, by stacking up a few copies of this structure, it is suitable to support QoS application for building super large scale switching fabric in next generation network(NGN).
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ICC - Load-Balanced Multipath Self-Routing Switching Structure by Concentrators
2008 IEEE International Conference on Communications, 2008Co-Authors: Bingrui Wang, Qinshu Chen, Binqiang WangAbstract:A novel two stage load-balanced multipath self-routing switch structure is introduced in this paper. Both stages use a multipath self-routing fabric. With simple algorithms and small buffers, the first stage fabric transforms the Incoming Traffic into uniform and the second stage fabric forwards the data in a self-routing manner to their final destinations. Compared with other similar structures, this structure outstands with no queuing delay and zero jitter, its component complexity and propagation delay are significantly reduced. Mathematical analysis and simulations show this structure can achieve 100% throughput under admissible Traffic pattern, which is a common presumption for Incoming Traffic. For statistically admissible Traffic, by stacking up a few copies of this structure, it is suitable to support QoS application for building super large scale switching fabric in next generation network(NGN).
