Resource management and task scheduling is a crucial problem (the core of all the questions) in Grid Environments. The aim of task scheduling is to take full advantage of grid resource and execute user's task request as early and quickly as possible. This paper introduces an agent-based resource management model and agent structure and its function. On the basis of local resource's adoption of the strategy "First Come First Served" to the task, we put forward a task Scheduling algorithm using a technique of task advertisement and discovery. Agents are organized into a hierarchy and the algorithm is based on multi-agent cooperation, to ensure that this methodology achieves the goal of task scheduling.
With development and popularization of computer network, network security problems increasingly bring into prominence. Intrusion detection technique can effectively enlarge the scope of protection on network and system. An intrusion detection method based on support vector machine (SVM) is studied. Aiming at the shortcoming of SVM on detecting precision, an intrusion detection model based on improved SVM is put forward according to hypothesis test theory. To confirm the effectiveness of this approach, a simulation testing is done. The experiment results show that the improved SVM has stronger learning ability and higher accuracy and lower false positive rate.
Mobile ad hoc networks are typically characterized by high mobility and frequent link failures, so routing protocol is crucially important. Multipath routing can be utilized so that alternate paths are available to reduce link failure. A nodedisjoint multipath routing protocol based on AODV was proposed in the paper. The main goal is to discover multiple node-disjoint paths with a low routing overhead during a route discovery. We also pay attention to residuary energy of nodes. Simulation results show that the proposed protocol results in significant performance improvement.
In this article, the numerical model of the multi-span iced eight-bundle conductor is established using the nonlinear finite element method, the galloping of the line under different parameters is simulated, and the tension in the galloping process is analyzed. Based on the aerodynamic characteristics and galloping characteristics of conductors, the galloping modes, frequency characteristics, vibration amplitudes, and galloping orbits of multi-span lines under different wind velocities, span lengths, ice shape, and number of spans are analyzed, compared with those of single-span lines. It is demonstrated that there are differences in galloping characteristics between multi-span transmission lines and single-span lines. Each span of the transmission line is different, so it should be fully considered in the research of galloping prevention and control technology.
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