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As an important field in information security, image encryption algorithm has been a research focus. At the same time there are few works on fractal set as the encryption key among various encryption algorithms. In the paper, Mandelbrot set (abbreviated as M set) and the Hilbert transformation are utilized to generate the random key. Since M set can be iterated from only a few parameters, it can reduce...
In this decade, peer-to-peer (P2P) applications have emerged as popular tools for sharing data and they have gained much attention. Such P2P applications build overlay networks on top of existing infrastructure networks and disseminate data in a peer-to-peer manner. How well the P2P overlay network maps onto the underlying physical network topology can significantly impact P2P application performances...
In this paper, we design and implement a hybrid WiMAX network testbed that integrates the NCTUns network emulator with a real-life WiMAX network. This hybrid WiMAX network testbed can seamlessly connect virtual networks (emulated by NCTUns) to a real-life WiMAX network. Thus, in this testbed real-life applications on real machines can exchange data with those on emulated (virtualized) network nodes...
It is difficult for online users to keep track of their social friendships and friends' social activities scattered across different social networking sites. We propose a user-centric approach for integrating social data from different social networking sites and allowing users to create personalized social and semantic contexts for their social data. Users can blend and group friends on different...
This paper proposes a ZSCTS methodology aiding in zero skew clock tree synthesis suitable to the mainstream industry clock tree synthesis (CTS) design flow. At the gate level, the original clock net is broken up into smaller partitions, and the clock buffers are inserted as pseudo clock sources to drive each portion. The automatic place and route (APR) tool may synthesize each clock subtree with better...
This paper presents a new speed-sensorless vector control drive system for induction motor. In order to produce low harmonics in output voltage and current, reduce the torque fluctuation, and avoid the high voltage jump in switching time, the system utilizes three-level inverter to supply power for the induction motor and a SVPWM scheme with neutral point voltage balance strategy is applied for the...
A meta-level and highly automated technique that could formally transform UML diagrams for verification is presented. Firstly, the meta-model hierarchical structure of UML is reviewed and the relationships among different UML diagrams are analyzed from different views. An approach for transforming and verifying UML statechart diagrams is developed based on graph transformation. This approach can be...
A method for modeling and analyzing workflows based on Temporal Logic of Actions is presented. After a brief review of TLA, present the semantic of workflow process using TLA and illustrate how to modeling and analysis workflow using TLA. In TLA, both the workflow model and its properties are modeled by TLA formulas. Analysis of workflow model in TLA is carried out by validating the implication relationship...
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