Dynamic Time Warping (DTW) is a widely used distance measurement in time series clustering. DTW invariant to phase perturbations but has quadratic complexity. An effective acceleration method must reduce the utilization ratio during clustering; for example, TADPole uses both upper and lower bounds prune off large of expensive calculations. To further ratio, we find that linear-complexity L1-nor...

With the rapid growth of security threats in computer networks, need for developing efficient security-warning systems is substantially increasing. Distributed denial-of-service (DDoS) and DoS attacks are still among most effective dreadful that require robust detection. In this work, we propose a new method to detect TCP DoS/DDoS attacks. Since analyzing network traffic promising approach, our...

We describe a “bag-of-rectangles” method for representing and recognizing human actions in videos. In this method, each human pose in an action sequence is represented by oriented rectangular patches extracted over the whole body. Then, spatial oriented histograms are formed to represent the distribution of these rectangular patches. In order to carry the information from the spatial domain des...

In this paper a region based technique is proposed to search complex human activity in a video. Most of the current activity recognition systems deals with single action type but in this system, by taking meaningful composition of different types of human actions, complex human activity is constructed which is searched in a video sequence. To extract features, this system employed the surroundi...

In this paper, we report on examining in applying of Spoken Term Discovery (STD) to lifelog images. STD is an approach to discover words which repeated in multiple speeches. We used an approach based on Dynamic Time Warping to discover patterns which are repeated in lifelog images. If this approach gives meaningful patterns, the results will be helpful information for lifelog researches (e.g. s...

Movie subtitle alignment is a potentially useful approach for deriving automatically parallel bilingual/multilingual spoken language data for automatic speech translation. In this paper, we consider the movie subtitle alignment task. We propose a distance metric between utterances of different languages based on lexical features derived from bilingual dictionaries. We use the dynamic time warpi...

The recent development of retrieval techniques and advances in 3D shape representation has induced a large amount of research. This paper presents a methodology with three options to retrieve shapes in 3D data bases, based on mapping shapes in 1D using representative sequences, which are matched using Fast Dynamic Time Warping distance. The three options are compared through a performance measu...

Adaptive approaches to synchronization in parallel discrete event simulations hold significant potential for performance improvement. We contend that an adaptive approach based on low cost near-perfect system state information is the most likely to yield a consistently efficient synchronization algorithm. We suggest a framework by which NPSI (near-perfect state information) adaptive protocols c...