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Recent years, a large number of open routing software architectures have emerged, such as XORP, ForCES, Ryu in SDN, reconfigurable platform, and so on. All of these architectures are open and comprising of components. They use components as the smallest resources, through the support of different assembly and release, to construct the complex routing and switching system. This paper take reconfigurable...
RBAC supports the principle of least privilege by the appropriate combination of roles assigned to users. However, the minimum role set is hard to find. Role hierarchy and inheritance can result in aggregating lots of permissions. To solve this problem, a task-constrained RBAC model is proposed in this paper, which presents four task-constraint rules to restrict the permission inheritance and role...
For charging station network with mixed operation mode, only adequate parking spaces and replaced battery can meet vehicles' charging requirements. However, the number of distributed batteries is very large in the whole network. Optimal distribution of batteries in charging station network is of great importance to ensure the normal operation of station network and greatly reduce the cost of manpower,...
In industrial automation, multi-mass system controlling is a common problem. Varying or unknown parameters, especially friction, make the control problem more difficult. The main purpose of this paper is to design an non-linear multi-stage PID controller to solve the problem above in multi-mass elastic torsional system. The preliminary of elastic torsional system is first analyzed. Then, nonlinear...
This paper analyses network software metrics based on the theory of the network software in order to reveal the object-oriented software system structure characteristics, and the structure and function of the internal connection. It is found that the nodes in software network are inherited tree such units, and limited gather together only in the tree. According to statistics, it can be seen that the...
Numerical reservoir simulation is one of the effective tools for complex fluid analysis in the oil industry. This paper analyzed the principle of thermal recovery simulation, and designed and implemented a parallel program of the thermal recovery simulation based on PESTc toolkit. The improved domain decomposition with load-balance control was presented to partition the computation into different...
Complex applications are usually modeled as workflows, which are often represented by Directed Acyclic Graph (DAG) and require the power of Grid to run efficiently. Cost-optimized workflow scheduling under deadline constraints is a fundamental and intractable problem on Grids. In this paper, an effective and efficient heuristic for workflow scheduling is proposed. A mixed integer programming (MIP)...
In order to solve the problem of impact in robotic force position control during the initial state, the hyperbolic tangent filter function which was constituted a non-linear PID was used to process tracking error and speed. A robot force and position controller without impact was achieved. The Popov method was applied to prove the stability of the system. Based on the force and position control experiment...
For years, several intra-frame encoding methods such as AC/DC prediction used in MPEG-4 and multiple modes intra predication used in H.264 were proposed and the above methods made more efficient compress performance. But compared with inter-frame, the performance still need improved. So, referring to the experience of inter frame compress technique, a novel intra-frame encoding method based on spatial...
In this paper, Web Service composition completeness estimation problem (SCEP) was proposed so as to prognosticate whether services can be successfully composed ahead of time. To solve the problem, first of all, we proposed a three-level model for SCEP, and gave the mapping way between situation theory and BPEL4WS. In this way, we can take advantage of situation calculus to describe service composition...
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