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DHC:Distributed,Hierarchical Clustering in Sensor Networks

Journal of computer science & Technology 2011年第4期26卷 643-662页

作者：马秀莉胡海峰李双峰肖红梅罗琼杨冬青唐世渭 School of Electronics Engineering and Computer Science Peking University Key Laboratory of Machine Perception(Peking University) Ministry of Education Google China Department of Computer Science and Engineering Hong Kong University of Science and TechnologyClear Water BayKowloon Key Laboratory of High Confidence Software Technologies(Peking University) Ministry of Education

In many sensor network applications, it is essential to get the data distribution of the attribute value over the network. Such data distribution can be got through clustering, which partitions the network into contiguous regions, each of which contains sensor nodes of a range of similar readings. This paper proposes a method named Distributed, Hierarchical Clustering （DHC） for online data analysis and mining in senior networks. Different from the acquisition and aggregation of raw sensory data, DHC clusters sensor nodes based on their current data values as well as their geographical proximity, and computes a summary for each cluster. ~3arthermore, these clusters, together with their summaries, are produced in a distributed, bottom-up manner. The resulting hierarchy of clusters and their summaries facilitates interactive data exploration at multiple resolutions. It can also be used to improve the efficiency of data-centric routing and query processing in sensor networks. We also design and evaluate the maintenance mechanisms for DHC to make it be able to work on evolving data. Our simulation results on real world datasets as well as synthetic datasets show the effectiveness and efficiency of our approach.

关键词： clustering data mining wireless sensor networks.

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A Fuzzy Lyapunov LMI Criterion to a Chaotic System

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Physics Procedia 2012年 25卷 262-269页

作者： K. Yeh C.W. Chen C.Y. Chen D.C. Lo P.Y. Chung Department of Construction Science and Technology De-Lin Institute of Technology Tucheng Taipei Taiwan Institute of Maritime Information and Technology National Kaohsiung Marine University Kaohsiung 80543 Taiwan Global Earth Observation and Data Analysis Center (GEODAC) National Cheng Kung University Tainan 701 Taiwan Department and Graduate School of Computer Science National Pingtung University of Education Pingtung 90003 Taiwan Department of Information Management Meiho University 23 Pingguang Rd. Neipu Pingtung Taiwan

In terms of the Fuzzy Lyapunov method, this work proposes stability conditions for fuzzy logic control (FLC). Their application for chaotic systems can be approximated by the Tagagi-Sugeno (T-S) fuzzy model. The fuzzy Lyapunov function is defined as a fuzzy blending of quadratic Lyapunov functions. External forces or disturbances are not considered in the controlled systems. In the design controller procedure, a parallel distributed compensation (PDC) scheme is utilized to construct a global FLC by blending all linear local state feedback controllers. The stability criteria are found not only for fuzzy modeling but also for a real chaotic system. Furthermore, this controller design problem can be reduced to a linear matrix inequality (LMI) problem by use of the Schur Complements. Efficient interior-point algorithms are now available in Matlab toolbox to solve this type of problem.

关键词： Fuzzy Lyapunov method linear matrix inequality

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Key-key-value stores for efficiently processing graph data in the cloud

Key-key-value stores for efficiently processing graph data i...

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International Workshop on Graph management: Techniques and Applications

作者： Connor, Alexander G. Chrysanthis, Panos K. Labrinidis, Alexandros Advanced Data Management Technologies Laboratory Department of Computer Science University of Pittsburgh United States

ISBN: (纸本)9781424491940

Modern cloud data storage services have powerful capabilities for data-sets that can be indexed by a single key - key-value stores - and for data-sets that are characterized by multiple attributes (such as Google's BigTable). These data stores have non-ideal overheads, however, when graph data needs to be maintained;overheads are incurred because related (by graph edges) keys are managed in physically different host machines. We propose a new distributed data-storage paradigm, the key-key-value store, which will extend the key-value model and significantly reduce these overheads by storing related keys in the same place. We provide a high-level description of our proposed system for storing large-scale, highly interconnected graph data - such as social networks - as well as an analysis of our key-key-value system in relation to existing work. In this paper, we show how our novel data organization paradigm will facilitate improved levels of QoS in large graph data stores. © 2011 IEEE.

关键词： Data handling

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Generating emphasis from neutral speech using hierarchical perturbation model by decision tree and support vector machine

Generating emphasis from neutral speech using hierarchical p...

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International Conference on Audio, Language and Image Processing, ICALIP

作者： Fanbo Meng Zhiyong Wu Helen Meng Jia Jia Lianhong Cai Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Computer Science and Technology Tsinghua University Beijing China Department of Systems Engineering and Engineering Management The Chinese University of Hong Kong Hong Kong China Tsinghua-CUHK Joint Research Center for Media Sciences Technologies and Systems Graduate School at Shenzhen Tsinghua University Shenzhen China Tsinghua University Beijing Beijing CN

In a computer-aided pronunciation training (CAPT) system, corrective feedback is desired to provide contrastive comparisons between user's and canonical pronunciations. This paper presents a hierarchical perturbation model to generate emphasis for English by modifying acoustic features of neutral speech to highlight such important speech segments. Synthesis of emphasis needs to be realized hierarchically at word, syllable and phone layers. A two-pass decision tree is constructed to cluster acoustic variations between emphatic and neutral speeches. The questions for decision tree construction are designed according to the above layers. The questions related to word and syllable layers are used to construct the main tree and then the questions related to phone layer are used to expand the leaves of main tree (deriving a set of subtrees). Support vector machines (SVMs) are used to predict acoustic variations for all the leaves of main tree (at word and syllable layers) and sub-trees (at phone layer). Experiments indicate that the proposed hierarchical perturbation model can generate emphatic speech with high quality for both naturalness and emphasis.

关键词： Speech Acoustics Decision trees Support vector machines Training Feature extraction Reactive power

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Detection and emphatic realization of contrastive word pairs for expressive text-to-speech synthesis

Detection and emphatic realization of contrastive word pairs...

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International Symposium on Chinese Spoken Language Processing

作者： Chunrong Li Zhiyong Wu Fanbo Meng Helen Meng Lianhong Cai Tsinghua-CUHK Joint Research Center for Media Sciences Technologies and Systems Graduate School at Shenzhen Tsinghua University Shenzhen China Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Computer Science and Technology Tsinghua University Beijing China Department of Systems Engineering and Engineering Management Chinese University of Hong Kong Shatin New Territories Hong Kong China Tsinghua University Beijing Beijing CN

This paper addresses the problem of automatic detection of contrastive word pairs and their acoustic realization in emphasis for expressive text-to-speech (TTS) synthesis in English. Support vector machines (SVMs) have been used to automatically detect contrastive word pairs from lexical features, syntactic dependencies and semantic relations. A much better performance is achieved by adding accent ratio and word identity features. Hidden Markov model (HMM) based speech synthesis is then used to generate emphatic speeches by putting emphasis on the detected contrastive word pairs. Subjective experiments show that most of the listeners consider putting emphasis on contrastive word pairs is more acceptable than on non-contrastive word pairs. This indicates the importance of the accurate detection of contrastive word pairs.

关键词： Hidden Markov models Speech Feature extraction Semantics Speech synthesis Support vector machines Syntactics

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Information technology and satisfaction in the banking industry: The mediating role of CRM implementation

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ICIC Express Letters, Part B: Applications 2012年第3期3卷 529-534页

作者： Hsu, Meng-Hsiang Hsu, Cheng-Se Yang, Yi-Feng Chen, Chen-Yuan Department of Information Management Graduate School of Management National Kaohsiung First University of Science and Technology No. 2 Jhuoyue Rd. Nanzih Dist. Kaohsiung 811 Taiwan Graduate School of Management National Kaohsiung First University of Science and Technology No. 2 Jhuoyue Rd. Nanzih Dist. Kaohsiung 811 Taiwan Graduate School of Business and Administration Shu-Te University No. 59 Hun Shang Rd. Yen Chao Dist. Kaohsiung 82445 Taiwan Department and Graduate School of Computer Science National Pingtung University of Education No. 4-18 Ming Shen Rd. Pingtung 90003 Taiwan

In this study, we explore the effect of information technology (IT) service applications, customer relationship management (CRM), and their interaction on customer satisfaction in the banking industry. We used data from two samples (bank staff and bank customers) to test the proposed hypotheses. Significant results were yielded by employing a Sobel test. IT service applications and CRM implementation are both found to directly affect customer satisfaction. Also, IT service applications are positively associated with CRM implementation. Finally, IT service applications exert an indirect effect on customer satisfaction through the mediating role of CRM implementation. The ndings highlight the pivotal role of CRM implementation in shaping customer satisfaction, with both direct and indirect effects. The current study advances our understanding of how IT service applications and CRM implementation contribute to customer satisfaction, especially for banks to adapt themselves to the dynamic banking industry. © 2012 ICIC International.

关键词： Customer satisfaction

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Reversible watermarking scheme with visibility using randomize distance

Reversible watermarking scheme with visibility using randomi...

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5th International Conference on Genetic and Evolutionary Computing, ICGEC2011

作者： Wu, Min-Hao Hsu, Fu-Hau Yang, Cheng-Hsing Wang, Shiuh-Jeng Department of Computer Science and Information Engineering National Central University Jhongli 320 Taiwan Department of Computer Science National Pingtung University of Education Pingtung 900 Taiwan Department of Information Management Central Police University Taoyuan 333 Taiwan

ISBN: (纸本)9780769544496

Digital watermarking is widely used to protect the copyright of digital media. The watermarking approach is usually to embed a copyright mark into the target media to claim the ownership. Any ownership dispute can be judged by detecting the existence of the copyright mark. In the paper, we propose a reversible visible watermark method, which embeds binary-imaged watermark into gray-scale images to create a visible watermark. Not using complex calculations, this paper tries to simply change the pixel value to achieve the digital watermark. Besides, a reversible steganographic method is used to embed the watermark information into the watermarked images. The watermark information can be used to recover the original images. © 2011 IEEE.

关键词： Steganography

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UZWEBMAT: A framework for expert system based on personalized adaptive and intelligent tutoring system for mathematics

UZWEBMAT: A framework for expert system based on personalize...

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IADIS International Conference e-Learning 2011, Part of the IADIS Multi Conference on computer science and Information Systems 2011, MCCSIS 2011

作者： Özyurt, Özcan Baki, Adnan Özyurt, Hacer Department of Computer Technologies Besikduzu Vocational School Karadeniz Technical University Trabzon Turkey Department of Science and Mathematics Education Karadeniz Technical University 61335 Trabzon Turkey

ISBN: (纸本)9789728939380

Conventional web based learning environments offer the same content to each user. Nowadays, these kinds of learning environments are gradually replaced by individualized adaptive learning environments. Therefore, many researchers work on the development of individualized learning environments instead of the systems which offer the same content to each user. In this study, an adaptive and intelligent web based system constituted to teach mathematics was designed and developed. Learning styles were based on the system named as UZWEBMAT. Based on Visual-Auditory-Kinesthetic (VAK) learning style, different contents prepared according to these three styles were offered to the students. While the content in each learning style is offered to the student, solution supports students will get for activities and the route students will follow in the system were determined by expert system support. With this study, the structure and architecture of UZWEBMAT system will be introduced. In future studies, experimental studies will be conducted with the developed UZWEBMAT. Hereby, UZWEBMAT will be evaluated according to different parameters such as practicability and its effect on academic achievements of students. © 2011 IADIS.

关键词： Students

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A data hiding scheme using the varieties of pixel-value differencing in multimedia images

A data hiding scheme using the varieties of pixel-value diff...

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作者： Yang, Cheng-Hsing Weng, Chi-Yao Tso, Hao-Kuan Wang, Shiuh-Jeng Department of Computer Science National Pingtung University of Education Pingtung 900 Taiwan Department of Computer Science National Tsing-Hua University Hsinchu 300 Taiwan Department of Computer Science and Communication Engineering Army Academy R.O.C. Chungli Taoyuan 320 Taiwan Department of Information Management Central Police University Taoyuan 333 Taiwan

In this paper, a capacity promoting technique is proposed for embedding data in an image using pixel-value differencing (PVD). The PVD scheme embeds data by changing the difference value between two adjacent pixels so that more data is embedded into two pixels located in the edge area, than in the smooth area. In order to increase the embedding capacity, a new approach is proposed in this paper by searching edge area more flexibly. Instead of processing a pair of pixels at a time as proposed by Wu and Tsai, two pairs of pixels in a block are processed at the same time. In addition, we proposed a pixel-value shifting scheme to further increase the chances for embedding data. Our scheme exploits the edge areas more efficiently, thus leading to an increase in embedding capacity as shown by experimental results compared to Wu and Tsai's method. Also, the embedding result of our scheme passes the Fridrich et al.'s detection. Besides, according to the distribution of difference values, more practical range partitions are suggested for improving capacity. © 2010 Elsevier Inc. All rights reserved.

关键词： Pixels

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Supporting the development of digital competences of pupils and teachers

Supporting the development of digital competences of pupils ...

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9th IEEE International Conference on Emerging eLearning technologies and Applications, ICETA 2011

作者： Host'ovecký, M. Zat'Ková, T. Faculty of Education Trnava University Department of Mathematics and Computer Science Trnava Slovakia Faculty of Economics and Management Slovak University of Agriculture in Nitra Department of Pedagogy and Psychology Slovakia

ISBN: (纸本)9781457700521

The author of this article dealing with issues of developing digital skills of students in primary and secondary schools. In addition to devote his attention now processing the results of testing students in various grades of the Slovak Republic and Czech Republic. Testing was conducted at several pre-selected objects and to analyze the results allow a comprehensive analysis of the cognitive level of students participating countries. In the project participated in three different institutions: University of Trnava in Trnava, the University of Ostrava and Methodology and Evaluation Center, ops in Ostrava. The obtained results of the project, as well as the objectives, specific focus are outlined below. © 2011 IEEE.

关键词： Students

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