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One major challenging issue in the designs of multi-core embedded systems is to tackle the communication problem among tasks with performance requirements and precedence constraints. This paper targets the problem of scheduling real-time tasks with chain-based precedence constraints over multi-layer bus systems with an objective to minimize the bus cost. We show the NP-hardness of the problem and...
Wireless Mesh Networks (WMNs) have the potential for improving network capacity by employing multiple radios and multiple channels (MRMC). Channel Assignment (CA) is a key issue that plays vital role in defining WMN throughput by efficient utilization of available multiple radios and channels there by minimizing network interference. The two important issues that are needed to be addressed by CA algorithm...
DISC (Data-Intensive Super Computing) is gaining strong research momentum. DISC systems differ from conventional supercomputers in their focus on data, as they acquire and maintain continually changing massive data sets, in addition to performing large-scale computations over the data. Towards this end, we consider the problem of real-time text indexing and search with high input data rates (10 GB/s...
One of the important concepts in MPLS Traffic Engineering (TE) is LSP setup routing. The objective of routing algorithm is to increase the number of accepted request and satisfying Quality of Service (QoS) constrains. Although much work has been done on laying MPLS paths to optimize performance, most has focused on satisfying bandwidth requirements as QoS constrains. The previously published research...
Cluster algorithm is one of the hotspots for studying routing protocol in mobile Ad Hoc networks, which is benefit for enlarging the network topology and utilizing the capacity of channel efficiently. This thesis researches the cluster algorithm of maximum node degree and modifies the update mechanism of cluster header. When the changing of node degree is within a range, the state of header is not...
With the development of humanoid robots, lightweight construction and energy efficiency play an important role. In state-of-the-art processes and methods concerning structural optimization it is assumed that there exists a set of external loads or load functions acting on the part. But humanoid robots are very complex mechatronic systems. The fact that the system's dynamic properties and its overall...
In many applicative scenarios it is important to derive information about the topology and the internal connections of more dynamical systems interacting together. Examples can be found in fields as diverse as economics, neuroscience and biochemistry. The paper deals with the problem of deriving a descriptive model of a network, collecting the node outputs as time series with no use of a priori insight...
In this paper, a novel optimization algorithm, named group search optimizer (GSO) with two improvements, is used to truss structure topology optimization. And the improved methods are using harmony memory and adhering to the boundary which can improve the algorithm obviously. Then a simple and effective topology method, discretization of topology variables is incorporated with improved GSO to make...
As a novel population-based optimization technique, the artificial physics optimization (APO) algorithm inspired by physics is presented recently. Although it is characteristic of rapid convergence speed, it also suffers from worse diversity and premature convergence. Accordingly, drawing lessons from those strategies for interactions among individuals in other algorithms, this paper presents the...
This paper proposed a redirection scheme used in the broadband access network to optimize the transmission of p2p service. The excellent performance of the proposed scheme in decreasing the burden of the core network data is verified through the simulations with NS2.
It is well known that reasoning with AI temporal projection problems is difficult. Determining the Possible Truth problem, a basic temporal projection decision problem, in the so-called Simple Event System remains NP-complete. In this paper, two types of constraints, on the graph-theoretic representation of the cause-and-effect relationships between events and on the partial orders of events, are...
In this paper we propose a methodology based on an evolutionary multiobjective optimization algorithm for the problem of up-grading (expansion) the physical topology of transparent optical networks. The aim is to define the new topology layout and the specification of the new optical devices that should be deployed in an existing network in order to improve its performance, considering simultaneously...
Given many known results on wireless network capacity, practical and optimal capacity utilization remains an open question. The existing link scheduling schemes in the literature are not applicable in large wireless networks because of their global operations for topology collection and transmission synchronization. As network size increases, global operations become infeasible to implement. We propose...
The high capacity of fibers used in optical networks, can be divided into many channels, using the WDM technology. Any damage to a fiber causes all the channels routed through this link to be broken, which may result in a serious amount of data loss. As a solution to this problem, the virtual layer can be mapped onto the physical topology, such that, a failure on any physical link does not disconnect...
In recent years, peer-to-peer (P2P) technology has been demonstrated tremendously effective in delivering large-scale video streaming services. Although P2P streaming is scalable and robust, the network-oblivious peering and scheduling in the current designs impede the further improvement in streaming quality and the efficient usage of network resources. New P2P streaming systems exploit network information...
The optimization model is built for intra-field service placement problem and an efficient algorithm is design to solve the problem. Several cost calculation methods are adopted to fit different structures of the composed service. Simulation result shows the intra-field service placement strategy decreases the cost for intra-field composed services, and the two-tier service placement strategy decreases...
The huge bandwidth of optical fibres is exploited through wavelength division multiplexing technology, which introduces new complexities in the routing problem. In this context, the wavelength converter allocation problem has become a key factor to minimize blocking. The wavelength converter allocation problem has been treated as a mono-objective problem minimizing the number of wavelength converters...
This paper illustrated the characteristics of UTP-5 and Hub-spoken topology, and presented the concept of margin motion coefficient and reliability coefficient based on graph theory and relation matrix and made thorough analysis and comparison. Suggestions are made on resolution of topology problems on cabling infrastructure of intelligent buildings.
The topology optimization of a structure with many subdomains is solved by a bionics approach, called as floating interval of reference strain energy density (SED). In practical engineering, a structure to be optimized may have many subdomains and each one is filled with a type of solid material as an initial design. To solve such kind of structural topology optimization, we present a heuristic approach...
Loading plate in fuselage flutter model is a thin-walled plate which is divided into regions with different thickness, so the design and manufacture is a difficult job. In this paper, topology optimum design of loading plate in fuselage flutter model for frequencies is presented. A thin-walled plate of variable thickness is converted to a constant thickness plate with holes. The method of Bi-directional...
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