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There is currently considerable interest in studying the problem of routing railway wagon-flow under various circumstances. In light of the lack and unbalanced utilization of carrying capacity in railway freight, a multi-objective 0–1 programming model and its transformation into a single-objective one were presented to optimizing transportation cost and rationalizing district load, and the corresponding...
This paper applies Particle Swarm Optimization algorithm (PSO) in a Multi-objective Vehicle Routing Problem with Time Window (MVRPTW). Firstly, through the problem analysis, establish a versatile mathematical model. Secondly, introduce an effective particle code to successfully implement the algorithm. Finally, examples prove that PSO can be obtained the optimal solution quickly and efficiently of...
While there has been many studies on the efficient design of p-cycles focusing on optimizing their spare capacity efficiency, few of them consider such a design under the wavelength continuity assumption, i.e., no wavelength converter at any node. Consequently, few authors look at the routing and wavelength assignment in the context of p-cycles, where p-cycles have to be assigned the same wavelength...
With the rapid development of logistics transportation, the number of high-level orderpickers in the warehouse is increasing day by day. In order to improve order picking efficiency, a mathematical model of this optimization problem is constructed according to characteristics of order picking of the high level orderpicker in a rectangular warehouse. To solve the model, G-A (Genetic-Ant colony) algorithm...
This paper introduces an improved PSO algorithm for power communication network routing, which minimizes the cost of communication and improves the Quality of Service (QoS). In this paper, PSO algorithm is improved in two parts of the parameter inertia weight and the discrete idea is added to, so that it can easily run out the local optimum and provide high speed of convergence as well as for the...
Longest-prefix matching (LPM) is a key processing function of Internet routers. This is an important step in determining which outbound port to use for a given destination address. The time required to look up the outbound port must be less than the minimum inter-arrival time between packets on a given input port. Lookup times can be reduced by caching address prefixes from previous lookups. However...
In the paper the mathematical model of traffic management in the MPLS-TE DiffServ network is proposed. This model describes the processes of routing and distribution channel resource. In article the method of two-level traffic management in the MPLS-TE DiffServ network is offered to improve the scalability of the solutions on the basis of interactions prediction.
Cognitive radio networks (CRNs) have the potential to utilize spectrum efficiently and are positioned to be the core technology for the next-generation multihop wireless networks. An important problem for such networks is its capacity. We study this problem for CRNs in the SINR (signal-to-interference-and-noise-ratio) model, which is considered to be a better characterization of interference (but...
Providing desired QoS is one of the crucial issues in routing protocols design in wireless sensor networks. In this paper, a mechanism for routing in wireless sensor networks is presented using nonlinear optimization. Providing fairness in nodes energy consumption and increasing network lifetime are considered as the main parameters. Proposed routing protocol, which is called FORP (Fair, Optimized...
Delivering desired QoS to the applications is one of the most important challenges in next generation networks. Designing efficient queue management in midway nodes leads to improvement in NGN efficiency. This paper presents fair Efficient active Queue Management (EQM) mechanism for congestion avoidance and control in next generation networks. Proposed AQM mechanism uses instantaneous queue length...
Logistics traffic scheduling is a key job for logistics activity, but there are some weak points, e.g. local optimum, premature convergence and slow convergence while we employ the traditional genetic algorithm to analyze that problem. Therefore, we need to improve the genetic algorithm to solve the vehicle routing problem. This paper builds up a mathematical model for the traffic scheduling problems...
Delay tolerant networks (DTNs) are a class of emerging networks that experience frequent and long-duration partitions. Multicast supports the distribution of data to a group of users, a service needed for many potential DTN applications, due to the unique characteristic of frequent partitioning in DTNs, multicasting in DTNs is a considerably different and challenging problem. In this paper, The mathematics...
Wireless Sensor Networks have recently aroused a great interest both from the academic and industrial communities, thanks to the bright perspective they offer in monitoring a broad range of phenomena. Despite some important achievements been reached in studying hardware and networking configurations, the applicative domain of a Wireless Sensor Network has been substantially neglected by the research...
In order to provide communication service in the Intermittently Connected Mobile Networks (ICMN) where there is only intermittent connectivity between mobile nodes, a variety of epidemic-style routing algorithms have been proposed to achieve high message delivery probability. However, current works do not address the realistic environment that a message is split into multi frames to be transmitted...
Using wireless mesh network characteristics of multi-hop networks, self-organization and other features, to improve the question of the overlarge quantities of communication task, uneven use of resources lead to the problem of low reliability of network communication. Analyze the factors which affect network reliability in the processes of information communication. And combine with bandwidth, node...
With the development of 90-nm and 65-nm technology, a layout optimization relating to real defects has become a necessity for DFM (Design for Manufacturability). In order to optimize a layout, it is essential to extract the position of nets from the layout. The paper provides a novel NSO (Net Sensitivity for Opens) model of arbitrary defect and layout, which takes into account the critical area and...
The mismatch and parasitics of layout and process in pipelined ADCs are analyzed in this paper and an optimized system has been implemented. Based on the model establishment of the proposed ADC, the offset of input in each stage and the fluctuation of reference voltage, which degrades the effective resolution of pipelined ADCs, caused by transistors mismatches and parasitic effects are modeled and...
Analyze classical MANET routing protocol, and combining with the idea of min cost max flow in networks, put forward a routing optimization model based on energy aware. Study the channel propagation property on physical layer and analyze the basic principles of large-scale path loss and multipath fading. Results of simulations in real radio propagation environment show that this model can prolong network...
In recent years, logistics distribution vehicle routing problem is a hot topic in logistics research. It is a NP problem and hard to get an optimal and satisfactory solution. The paper introduces removing-addition operator and excellent individual memory mechanism to the traditional genetic algorithm, so that the improved genetic algorithm can kee excellent individuals and maintain the population...
Wireless Sensor Networks(WSN) is a hot spot of the research of wireless networks currently, the key of achieving efficient transmission business is to control node energy and improve the network lifetime in wireless sensor networks. The paper first uses Boolean sensing model based on Poisson point process to identify the function of the rate of coverage and the node density in unit area, and then...
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