In recent years, internet-scale worm incidents occurred many times. People wonder at the speediness of the worm spread and the severe damage to the internet. So people began to find methods to detect worms as quickly ...
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The goal of surface simplification is to reduce the number of triangles in 3D models, while maintaining quality. However, surface simplification can easily destroy the contour features of the original surface. The pro...
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In general mobile nodes in mobile Ad-hoc networks have a limited power capacity. Therefore power management is an important issue. Some protocols are proposed considering node power consumption, such as MTPR, MBCR, MM...
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In infrastructure wireless networks, the wireless hop can be considered as another hop of the transmission path. With the rapid growth of wireless traffics, the future wireless network is expected to provide services ...
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Due to increase in occurrences of intrusion events, organizations are now moving towards implementation of various types of monitoring systems to detect and prevent IT security breaches. For that purpose, different te...
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ISBN:
(纸本)1932415823
Due to increase in occurrences of intrusion events, organizations are now moving towards implementation of various types of monitoring systems to detect and prevent IT security breaches. For that purpose, different techniques have been used. Logging is one of such technique. Typical enterprise consists of firewalls, intrusion detection systems, operating systems, legacy applications etc, where each element uses its own conventions and formats of logs. It increases the complexity in comprehensive analysis of logs to generate real time alerts and it also increases time to conduct forensic analysis. In this paper we have presented the concept of application level unification of logs in a consistent format at centralized locations to detect and prevent real time or near real time intrusions in a cost effective manner.
Attribute reduction is necessary in decision making system. Selecting right attribute reduction method is more important. This paper studies the reduction effects of principal components analysis (PCA) and system reco...
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Attribute reduction is necessary in decision making system. Selecting right attribute reduction method is more important. This paper studies the reduction effects of principal components analysis (PCA) and system reconstruction analysis (SRA) on coronary heart disease data. The data set contains 1723 records, and 71 attributes in each record. PCA and SRA are used to reduce attributes number (less than 71 ) in the data set. And then decision tree algorithms, C4.5, classification and regression tree ( CART), and chi-square automatic interaction detector ( CHAID), are adopted to analyze the raw data and attribute reduced data. The parameters of decision tree algorithms, including internal node number, maximum tree depth, leaves number, and correction rate are analyzed. The result indicates that, PCA and SRA data can complete attribute reduction work,and the decision-making rate on the reduced data is quicker than that on the raw data; the reduction effect of PCA is better than that of SRA, while the attribute assertion of SRA is better than that of PCA. PCA and SRA methods exhibit goodperformance in selecting and reducing attributes.
The paper presents a portable 3D acquisition system to get the depth information from a single snap shot. Traditionally, a stereo system needs two cameras to reconstruct the 3D shape. We propose a technique which can ...
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The paper presents a portable 3D acquisition system to get the depth information from a single snap shot. Traditionally, a stereo system needs two cameras to reconstruct the 3D shape. We propose a technique which can be applied to the commercial digital signal camera, and make the 2D camera be able to capture 3D information. The proposed system contains three components: a flash, a commercial camera, and a triaperture lens. A hierarchical pseudo sub-pixel correlation algorithm is proposed to compute the disparity vectors at a fast speed. It is an adaptive block-based correlation process based on the sparse array of the extracted features. The flash projects the speckle pattern onto the object and the camera captures a single snap shot at the same time. In order to embed the 3D information in one captured image, we use a novel lens containing three off-axis apertures, where each aperture was attached one color filter. Therefore, a captured image carries the information from three different viewing directions. The experimental results show that our approach is robust and convincing.
The growing complexity of distributed systems in terms of hardware components, operating system, communication and application software and the huge amount of dependencies among them have caused an increase in demand ...
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In this paper the improvement of fuzzy c-means clustering method is discussed. In the improvement of fuzzy c-means clustering method, the distance definition in Euclidean space is replaced by fuzzy weighting distance,...
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In this paper, generalized quadrature bandpass sampling (BPS) in voltage-mode with inherent FIR filtering is presented. By using the theory of sampling equivalence, this sampling strategy is comparable to another stra...
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In this paper, generalized quadrature bandpass sampling (BPS) in voltage-mode with inherent FIR filtering is presented. By using the theory of sampling equivalence, this sampling strategy is comparable to another strategy, charge sampling with intrinsic IIR filtering. The theoretical analysis and simulation results show that this inherent FIR filtering not only has the advantage of rejecting or attenuating images and interference, but is also helpful in suppressing noise aliasing. A realizable implementation of the proposed sampling strategy by uniform quadrature BPS (UQBPS) promises to suppress noise aliasing in BPS systems to a large extent.
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