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Intelligent Transportation System is a worldwide research hotspot and the extraction of traffic parameters is a crucial part of it for subsequent identification of traffic states. This paper proposes a novel approach of extracting traffic parameters such as time occupancy, volume and vehicle velocity based on video images. Visual features obtained from spatio-temporal images are more immune to environmental...
The mutual exclusion of roles as an effective means of implementing separation of duty, has an important role on access control in RBAC systems. This paper deeply discusses the types that the mutual exclusion of roles come from, and puts forward a model of describing mutual exclusion of roles. The model is similar to the structure of adjacency multiple table, and its basic unit is the role structure...
The implementation of wind power forecast technology considerably accelerates the development of wind energy utilization. However, wind power is difficult to be accurately forecasted due to its intermittency and randomness. Meanwhile, a classic prediction system usually could not provide the uncertainty of the predicted wind power so that the suspicious predicted value challenges the dispatch scheduling...
This article covers a problem that often arises in real life situations-the maximum flow problem. This problem is a classical combinatorial optimization problem, which arises in many engineering and scientific applications. It is also the important content of computer science and operational research. In order to reduce computational complexity, many improvement methods have been proposed. In this...
With regard to large-scale network, the classical methods are not suitable for resolving the problems of network analysis, which is due to large space demanding and time consuming. Most of large-scale networks have the feature of community structure in the area of complex network. Sub graphs of the original network have closer relations within them while estranged one between any two sub graphs. Therefore,...
This paper presents an adaptive packetization method, targeting at the video transmission over the wireless networks. Above all, the mean and the variance of overall end-to-end distortion are examined, which show that the error-concealment distortion and its variance are more sensitive to the packetization scheme rather than the overall distortion. Since the previous end-to-end distortion models usually...
In order to teach college freshmen more conveniently, we have formulated a questionnaire to investigate the computer basic knowledge they had got in secondary schools. This paper measures and analyzes the reliability and validity of that questionnaire by the technology of education measurement. The result indicates that the questionnaire has a good internal consistency; and its distinction validity,...
In the task running environment oriented to communication field applications, the characteristcs of a task are commonly undeterministic and unpredictable due to the unsteadiness of communication networks. It is necessary to apply fuzzy concept and theory into the embedded soft real-time task scheduling field. In this paper, we presented a fuzzy scheduling model based on multi-characteristics of a...
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