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Simulation is one of the most popular evaluation methods in scientific workflow studies. However, existing workflow simulators fail to provide a framework that takes into consideration heterogeneous system overheads and failures. They also lack the support for widely used workflow optimization techniques such as task clustering. In this paper, we introduce WorkflowSim, which extends the existing CloudSim...
We design the output feedback controller for a class of nonlinear systems with a state delay, structural and external disturbances. The external perturbation is bounded. Structural disturbance means the unmodeled and unknown stable dynamics in the control loop. In this paper we consider the problem of exponential stability for disturbed systems which can be represented as a feedback connection of...
The growth of different types of applications in the Internet arises the need for supporting Quality of Service (QoS) for them. Differentiating services aims to differentiate among applications in order to provide their requirements based on the level of QoS they need and their characteristics. In this paper we introduce a dynamic QoS-Aware queuing algorithm to differentiate services in IP basednetworks,...
A variety of network deployments in disaster recovery, fire fighting and military scenarios create networks that do not form a connected network all the time. In such scenarios, paths between a source and destination may be created over time when nodes encounter each other due to node mobility. Many routing algorithms that can route messages in such delay-tolerant networking (DTN) settings have been...
Delay tomography is one of the key components of network tomography that has been studied for a number of years. In this paper, an EM-like algorithm is proposed for the delay tomography of the tree topology that uses a dynamic-programming strategy to perform n-fold deconvolution. The effectiveness of the algorithm has been confirmed by simulation.
In order to ease congestion phenomenon in the case of limited resources of nodes, this paper presents an adaptive congestion control algorithm based on the node's priority. The proposed algorithm confirms prioritization according to the degree of congestion situation, and then adaptively chooses its probability of accessing channel in order to quickly relieve the congestion in this region. Experimental...
Flight landing optimization at the terminal area is an ongoing challenge for air traffic controllers. The current schedule scheme is first-come-first-served (FCFS). There are studies focusing on how to minimize the total cost or maximize the throughput. These schemes are short of fairness consideration. In this paper, we start from a real recent example to show that a lack of consideration of long-term...
Track assignment is a critical step between global routing and detailed routing in modern VLSI chip designs. Crosstalk, which is largely decided by wire adjacency, has significant impact on interconnect delay and circuit performance. Therefore, the amount of crosstalk should be restrained in order to satisfy timing constraints. In this work, a novel track assignment algorithm is proposed to reduce...
Routing is one of the most significant challenges regarding mobile ad hoc networks (MANETs). Having no fixed infrastructure as well as frequent changes of network topology, as a result of nodes mobility, necessitates cooperation of all nodes in routing of packets. Lack of cooperation in routing can result in performance reduction and even network denial of service. Uncooperative behavior can be performed...
DTN (Delay Tolerant Network) is a new type of mobile Ad Hoc network. Due to its characteristics such as long communication delay, high dynamic topology, it is difficult to maintain the stability of end to end paths. Therefore, design of effective and reliable routing algorithms has become the key issue in DTN. To avoid random and blindfold forwarding in Spray and Wait routing, a DTN routing algorithm...
Ant colony optimization (ACO) is a kind of new type heuristically optimizing algorithm, having ability to organize itself. In order to solve the problem that QoS routing faces while study at present, this paper proposes a new QoS routing algorithm based on an improved ACO which introduces a routing quality based parameter adaptive mechanism. Simulation results demonstrate that the algorithm has a...
We investigate the problem of influence limitation in the presence of competing campaigns in a social network. Given a negative campaign which starts propagating from a specified source and a positive/counter campaign that is initiated, after a certain time delay, to limit the the influence or spread of misinformation by the negative campaign, we are interested in finding the top k influential nodes...
The high dynamic of mobile peer-to-peer network makes the topology of network changing frequently, inconsistent of overlay network and bottom physical network topology, which can make worse network capability, higher failure rate of super-peer, longer query delay, lower effect of data transmission, as well as lower success rate of resource searching and system instability. This paper proposes a resource...
Partitioning network, especially some DTN, can use Message Ferry(MF) scheme to restore network connection. Message TTL describes the maximum delay tolerance of transmission and messages with out-of-date TTL should be dropped. In this paper, we will study the problem of how to design the ferry's moving route dynamically to get high message delivery ratio under the constraint of message TTL, which we...
In this paper, the fuzzy logic-based decision algorithm is proposed for queue scheduling. This algorithm is employed to determine the optimal values for achieving fairness control for each queue-type serviced. It takes into account the dynamic nature of the internet traffic as regards to its time-varying packet arrival process that affects the network states and performance. In order that the fairness...
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...
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...
Increased commodity use of mobile devices has the potential to enable mission-critical monitoring applications. However, these mobile-enabled monitoring applications have to often work in environments where a delay-tolerant network (DTN) is the only feasible communication paradigm. Detection of complex (composite) events is fundamental to monitoring applications. However, the existing plan-based CED...
We propose and evaluate a novel energy and delay efficient OFDMA-based master medium access control (MAC) framework — the meta-MAC — for heterogeneous coexistence in next-generation PON, featuring both low computational complexity and low end-to-end packet delay.
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