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—This report describes our ongoing work on a new end-to-end available-bandwidth measurement tool: FEAT (Fish-Eye Available-bandwidth Tool). FEAT features a new dynamic pattern of probes called a Fisheye Stream. One fisheye stream covers a range of packet probing rates. A fisheye stream consists of a focus region, where the probing rates are sampled more(More)
It is well observed that usually the run-length of successive zero coefficients becomes longer and the magnitude of non-zero coefficients gets smaller while the DCT subband frequency increases. So the probability distributions of level/run combinations should be different at different DCT positions. Based on this observation, an efficient context based(More)
We consider the problem of partial shape matching. We propose to transform shapes into sequences and utilize an algorithm that determines a subsequence of a target sequence that best matches a query. In the proposed algorithm we map the problem of the best matching subsequence to the problem of a cheapest path in a directed acyclic graph (DAG). The approach(More)
In this paper, we introduce a new clustering algorithm, FCC, for intrusion detection based on the concept of fuzzy connectedness. This concept was introduced by Rosenfeld in 1979 and used with success in image segmentation; here we extend this approach to clustering and demonstrate its effectiveness in intrusion detection. Starting with a single or a few(More)
—The purpose of Green Communications is to reduce the energy consumption of the communication system as much as possible without compromising the quality of service (QoS) for users. An effective approach for Green Wireless Communications is On-Demand strategy, which scales power consumption with the volume and location of user demand. Applying the On-Demand(More)
We propose a dimensionality reduction technique for time series analysis that significantly improves the efficiency and accuracy of similarity searches. In contrast to piecewise constant approximation (PCA) techniques that approximate each time series with constant value segments, the proposed method--Piecewise Vector Quantized Approximation--uses the(More)
We consider architecture and synthesis techniques for FPGA logic elements (function generators) and show that the LUT-based logic elements in modern commercial FPGAs are over-engineered. Circuits mapped into traditional LUT-based logic elements have speeds that can be achieved by alternative logic elements that consume considerably less silicon area. We(More)