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Systems with tightly interacting computational (cyber) units and physical systems are generally referred to as cyber-physical systems. They involve an interplay between embedded systems, control theory, real-time systems and software engineering. A very good example of cyber-physical systems design arises in the context of automotive architectures and software. Modern high-end cars have 50–100 processors...
A latency-hiding algorithm for the parallelization of large scale agent-based model simulations (ABMS) on parallel/distributed computing platform is proposed. The key idea of this algorithm is using redundant computations to hide communication latencies. An analytical model for this algorithm is presented to tell how to select R value to reach the best speedup. Compared to B+2R algorithm [1], theoretical...
Aimed to reduce the overheads using the Time Management (TM) in HLA based distributed simulations, the TM based on publish-subscribe topology information is investigated. The condition under which the message may be received before its causal predecessor is firstly analyzed. And then, the TM algorithms using vector clock are put forward, in which the condition is judged before the clock is comparing...
Delay is an important parameter that needs to be considered in the reversible logic designs, but not much work on delay in reversible network has been done at present. This paper presents an algorithm to calculate delay of reversible network. In the process of calculating delay, we not only take the complexity of different logic gates into consideration, but also the relationship between the output...
Limited resources in Wireless Sensor Networks (WSNs) are the key concern that needs to be given a careful consideration when studying virtually any aspect of a sensor network. Therefore, energy demands and radio bandwidth utilization should be addressed, especially in one-to-many communication. To define the problem, this article presents and categorizes the most common WSN multicast procedures depending...
Cognitive Radio is an enabling technology that is expected to address the problem of scarcity of spectrum by intelligent access, mobility and management of spectrum and pave way for efficient usage of the same. Increasingly, it is seen that most research is directed towards building theoretic models for spectrum access and management. Though some of these are backed by simulations, certainty of any...
In Orthogonal Frequency Division Multiplexing and Discrete Multitone transceivers, a guard interval called Cyclic Prefix (CP) is inserted to avoid inter-symbol interference. The length of the CP is usually greater than the impulse response of the channel resulting in a loss of useful data carriers. In order to avoid long CP, a time domain equalizer is used to shorten the channel. In this paper, we...
We address the problem of finding the least cost disjoint path pair with delay constraints, where working and protection paths require different delay constraints. A heuristic algorithm is proposed and compared with optimal ILP results.
Swarm intelligence inspired by the social behavior of ants boasts a number of attractive features, including adaptation, robustness, decentralized and self-organizing nature, which are well suited for routing in modern communication networks. This paper describes a new adaptive dynamic routing algorithm for packet-switched communications networks based on simple biological “ants” that explore the...
Traditional G-P algorithm exist two drawbacks in solving the correlation dimension of chaotic time series. The one is the subjective existence to determine scaleless range, the other is calculation error is large when the amount of data is small. For two shortcomings, the fuzzy C-means clustering is introduced to the G-P algorithm to determine the no-scales range. Least-squares fitting method is used...
Skyline queries have played an increasingly important role in many applications such as web mining, multi-preference analysis and decision making. Most existing studies mainly focus on centralized systems, and skyline query processing in distributed environments is still an emerging and challenging topic. In this paper we propose SkyStorm, a delay-bounded skyline computing approach by exploiting the...
With Received Signal Strength (RSS) based indoor localization gaining popularity, recent research work has explored many different aspects of such localization systems, for instance, accuracy and deployment cost. In this paper, we study the computational cost of a ratio-based localization algorithm. Specifically, we use the algorithm's inherent distance ratio relationship to refine the physical region...
The emergence of translucency in WDM networks as a trade-off between the low cost of full transparency and high signal quality provided by full opacity has led to immense interest in translucent network design by the research community in recent years. Efficient translucent network design necessitates the judicious choice of regeneration sites and number of regenerators in order to maintain a predefined...
In Wireless Sensor Network (WSN) researches, WSN routing algorithm is one of the hot issues. This article focuses on GPSR (Greedy Perimeter Stateless Routing) and uses the NS2 (Network Simulator-2) to simulate both GPSR and the improved algorithm GPSRI (GPSR-Improved). Consequently, we have compared GPSRI with GPSR in terms of important parameters, such as data transmit delay and data relay hops....
In this paper, a new recursive multibit recoding multiplication algorithm is introduced. It provides a general space-time partitioning of the multiplication problem that not only enables a drastic reduction of the number of partial products (N/r), but also eliminates the need of pre-computing odd multiples of the multiplicand in higher radix (r≥3) multiplication. Based on a mathematical proof that...
It was recently shown that the reverse carpooling technique can realize the benefits of network coding while requiring only a simple coding scheme that can be efficiently implemented in practice. However, when no opportunity for coding exists at an intermediate (relay) node, it needs to decide whether to transmit an uncoded packet or wait for the next opportunity to create a coded packet. While the...
A key challenge of cyber physical system is how to design the communication system. In this paper, the framework of hybrid system which consists of both continuous and discrete system states is adopted for the communication system design, particularly on the routing problem. The mapping between the routing scheme and the system dynamics mode is established by analyzing the impact of delay on the system...
With the advances of e-Science, scientific workflow has become an important tool for researchers to explore scientific discoveries. Although several scientific workflow management systems (SWFMSs) have been developed, their support of exception handling is still limited. In this paper, we introduce our approach of exception handling in the VIEW scientific workflow management system. We propose an...
As the demand for multimedia traffic via satellite increase, quality of service (QoS) management becomes more crucial, especially for the effective utilization of on-board switching capabilities of multi-beam satellite system. For multimedia services, parameters related to different requirements need to be evaluated in terms of delay, jitter, blocking probability and burstiness. This paper is on the...
Decreasing the soaring energy cost is imperative in large data centers. Meanwhile, limited computational resources need to be fairly allocated among different organizations. Latency is another major concern for resource management. Nevertheless, energy cost, resource allocation fairness, and latency are important but often contradicting metrics on scheduling data center workloads. In this paper, we...
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