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The S transform is a useful linear time-frequency distribution and has been applied to various fields. Since the inverse S transform is an over-determined problem, there exist several different algorithms, which result in different filtering effects. This paper models the discrete S transform in matrix form and proposes a new inverse S transform algorithm with least square error in filters. This paper...
Event evolvement and topic shifting can affect the accuracy of event tracking. A dual-center event model is proposed to improve the event tracking process by adjust the some attributes of event dynamically. The detail of maintenance of the model is given. The experiment results show that the dual-center event can improve event tracking effectively under the condition of event evolvement and topic...
Clustering Web search result is a promising way to help alleviate the information overload for Web users. In this paper, we focus on clustering snippets returned by Google Scholar. We propose a novel similarity function based on mining domain knowledge and an outlier-conscious clustering algorithm. Experimental results showed improved effectiveness of the proposed approach compared with existing methods.
XML employs a tree-structured model for representing data, and queries over XML documents are typically represented as twig patterns. At the same time, keyword search over XML documents has been well studied because of its intuitive and friendly query interface. Consequently, XQuery Full-Text emerges as a full-text extension to XQuery to query both the structure and the text content of XML documents...
To satisfy the requirements and resolve the existing problems of the relay protection of the distribution system under high distributed generation (DG) penetration level, a regional longitudinal comparison scheme is introduced in this paper. The composition and algorithm of fault directional relay are also discussed. Simulations based on PSCAD show that the fault detection algorithm is correct and...
Similarity join is a useful primitive operation underlying many applications, such as near duplicate Web page detection, data integration, and pattern recognition. Traditional similarity joins require a user to specify a similarity threshold. In this paper, we study a variant of the similarity join, termed top-k set similarity join. It returns the top-k pairs of records ranked by their similarities,...
Skyline computation has many applications including multi-criteria decision making. In this paper, we study the problem of efficient processing of continuous skyline queries over sliding windows on uncertain data elements regarding given probability thresholds. We first characterize what kind of elements we need to keep in our query computation. Then we show the size of dynamically maintained candidate...
The invariants of circular surface with fixed radius are investigated by means of differential geometry. Two moving frames are established, which are respectively on the central curve and the circle generatrix of circular surface. Based on the unit normal vector of the circular plane and the arc length of its spherical image curve, the former frame and the central curve are combined and the vector...
In this work, two HTS YBCO rf SQUIDs are used to form a gradiometer without electronic subtraction and digital data processing is applied to cancel the environmental noise. With healthy volunteers as measuring subjects, MCG recordings of various signal-to-noise-ratio SNR are obtained under different shielding conditions in environments of different noise components and characteristics. To extract...
This paper deals with the problem of reliable control against controller failure for a class of uncertain discrete time systems with both state and input delay. The considered system is modeled as uncertain discrete switched system with stable and unstable subsystem. Based on average dwell time method, the sufficient conditions of exponential stability for system are given in terms of linear matrix...
A dual-polarized phased array antenna for synthetic aperture radar (SAR) application is introduced in this paper. The RF topology configuration is illuminated briefly. An antenna module was tested and the measured results are presented, with which an applied array antenna should be extended with RF distribution networks, power supply and control subsystem used.
A microstrip antenna array fed by hybrid method, i.e. the coplanar microstrip series-fed linear patch arrays excited by waveguide slots coupling, is presented. The linear patch arrays conform to the surface of a cylinder. A novel dual slot electromagnetic coupling method is presented further to suppress its radiation to achieve good polarization purity. The array achieves perfect characteristics.
We introduce a social network analysis method as a new approach to build an Intrusion Detection System (SN-IDS) in ad hoc networks. The SN-IDS utilizes social relations as metrics-of-interest for anomaly detections, which is different from most traditional IDS approaches. To construct proper social networks, we first investigate ad hoc MAC and network layer data attributes and select relevant social...
This paper analyses the advantages and disadvantages of the K-means algorithm and the DENCLUE algorithm. In order to realise the automation of clustering analysis and eliminate human factors, both partitioning and density-based methods were adopted, resulting in a new algorithm - Clustering Algorithm based on object Density and Direction (CADD). This paper discusses the theory and algorithm design...
By interconnecting the power system, distributed generation (DG) can not only improve the system reliability, but also enhance the robustness against some emergencies such as snow storm etc. However, the increasing penetration of DG in power systems will deeply affect the distribution network topology, the amplitude and distribution of short-circuit current in the existing distribution network, and...
In this paper, the novel mechanical switch device: suspended-gate FET is applied to FPGA development. This device offers almost an ideal subthreshold swing and a hysteretic resistance switching, opening opportunities for low-power applications. The proposed device can be used as the building block of programmable elements and memory of an FPGA. Based on this device, the proposed FPGA architecture,...
In this paper, the results of stabilizing a large scale nonlinear systems with uncertain dynamic interactions and unmodelled dynamics depending on both subsystem inputs and outputs in [9] and [10] are extended to highly nonlinear systems. Certain modifications on standard adaptive backstepping controllers are proposed to compensate for the effects of interactions from other subsystems in designing...
Association analysis arises in many important applications such as bioinformatics and business intelligence. Given a large collection of measurements over a set of samples, association analysis aims to find dependencies of target variables to subsets of measurements. Most previous algorithms adopt a two-stage approach; they first group samples based on the similarity in the subset of measurements,...
We propose contourlet-based algorithms to extract local angle from seismic migrated images and attenuate seismic noise. Steerable pyramid and projection-filter-based complex wavelet transform have been used to extract seismic local angle, while curvelet transform and complex wavelet transform have been used to attenuate seismic noise. However, previously mentioned transforms either have a fixed number...
We describe a new approach for inferring the functional relationships between non-homologous protein families by looking at statistical enrichment of alternative function predictions in classification hierarchies such as Gene Ontology (GO) and Structural Classification of Proteins (SCOP). Protein structures are represented by robust graphs, and the Fast Frequent Subgraph Mining algorithm is applied...
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