Hongfei Fan

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Real-time collaborative programming and non-real-time collaborative programming are two classes of methods and techniques for supporting programmers to jointly conduct complex programming work in software development. They are complementary to each other, and both are useful and effective under different programming circumstances. However, most existing(More)
Operational Transformation (OT) is commonly used for conflict resolution in real-time collaborative applications, but none of existing OT techniques is able to solve a special type of conflict - orthogonal conflict, which may occur when concurrent operations are inserting/deleting an arbitrary number of objects in different dimensions of a two-dimensional(More)
Real-time collaborative programming environments support multiple programmers to edit the same source code document at the same time over communication networks. One key challenge in supporting real-time collaborative programming is semantic conflicts, which may occur when multiple programmers are performing concurrent and incompatible work in(More)
Real-time collaborative programming environments support a team of programmers to edit the same shared source code document concurrently over communication networks. This paper presents the design and implementation of a novel real-time collaborative programming system named CoEclipse, which transparently converts the single-user Eclipse IDE into a(More)
BACKGROUND With the rapid development of cloud computing techniques, it is attractive for personal health record (PHR) service providers to deploy their PHR applications and store the personal health data in the cloud. However, there could be a serious privacy leakage if the cloud-based system is intruded by attackers, which makes it necessary for the PHR(More)
In recent years, group signature techniques are widely used in constructing privacy-preserving security schemes for various information systems. However, conventional techniques keep the schemes secure only in normal black-box attack contexts. In other words, these schemes suppose that (the implementation of) the group signature generation algorithm is(More)
 Abstract—In this paper we propose an efficient hybrid zero block early detection method for high efficiency video coding (HEVC). Our method detects both genuine zero blocks (GZBs) and pseudo zero blocks (PZBs). For GZB detection, we use two sum of absolute difference bounds and one sum of absolute transformed difference threshold to decrease the GZB(More)