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In the realm of computer supported cooperative work in design (CSCWD), how to ensure the authenticity and integrity of an image plays important roles. This paper presents a novel semi-fragile image watermarking scheme for authenticating and recovering image content. The scheme also shows strong robustness on those images' content reserved operations. It can precisely detect and locate malicious operations...
Discovering non-trivial matching subsequences from two time series is very useful in synthesizing novel time series. This can be applied to applications such as motion synthesis where smooth and natural motion sequences are often required to be generated from existing motion sequences. We first address this problem by defining it as a problem of l-epsiv-join over two time series. Given two time series,...
Delay dependent decentralized robust H∞ control for a class of interconnected large-scale systems is considered. The time-delays are assumed as time-varying, and exist in interconnected and measurement output matrices. The decentralized output feedback H∞ controllers are designed. Combining the Lyapunov-Krasovskii functional approach and the delay integral inequality of matrices, the delay dependent...
This a new access control model DRBAC based on role and department is proposed, which extends the traditional role-based access control (RBAC) model. The new model adds the abstraction of the department property and simplifies the operational process by means of the authenticating management based on transaction.
Through detailed analysis of energy consumption of wireless sensor network with uniform node distribution, it is proved that the assumption of network where the density of sensor nodes in the same circular ring is uniform can cause inaccurate analysis of energy consumption. A more accurate theoretically analytical method for avoiding energy hole is proposed for wireless sensor networks with non-uniform...
Querying XML data is a computationally expensive process due to the complex nature of both the XML data and the XML queries. In this paper we propose an approach to expedite XML query processing by caching the results of frequent queries. We discover frequent query patterns from user-issued queries using an efficient bottom-up mining approach called VBUXMiner. VBUXMiner consists of two main steps...
Mining the evolving trends of an online data stream and forecasting the data values in the future can provide important support for the decision-making in many time-sensitive applications. This paper models an online data stream as a continuous state transitions process by mapping the possibly infinite stream data into finite states, and uses state transition disGraph (STG) to maintain the track of...
With the growing popularity of XML technology, developing effective and efficient query techniques of XML data becomes an important problem. In this paper, we introduce a query recommendation technique, which is able to provide both result recommendation and query input recommendation for XML queries, to help users to find useful information more efficiently. Ln our approach, we mine association rules...
In this paper, we present an optimization framework for querying XML data by caching frequent query patterns. In this framework, frequent query patterns are mined online from user queries, and these query results are cached for future use. The mining process of frequent query patterns is launched automatically when user queries meet predefined requirements. To deal with queries that are similar to...
Physical database design is a key phase in devising and deploying a database system to improve overall system performance, and automatic physical database design becomes an important value-added feature in a database system to decrease the TCO (total cost of ownership). A GAPDD (general automatic physical database design) framework, with two phases, the workload mining phase and the design advising...
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