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Identifying Zigzag based Perceptually Important Points for indexing financial time series

Identifying Zigzag based Perceptually Important Points for i...

引用

IEEE International Conference on Cognitive Informatics

作者： Chaliaw Phetking Mohd Noor Md. Sap Ali Selamat Faculty of Science and Technology Rajabhat Suan Dusit Unviersity Wachira Bangkok 10170 Thailand Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai Johor Malaysia

Financial time series often exhibit high degrees of fluctuation which are considered as noise in time series analysis. To remove noise, several lower bounding the Euclidean distance based dimensionality reduction methods are applied. But, however, these methods do not meet the constraint of financial time series analysis that wants to retain the important points and remove others. Therefore, although a number of methods can retain the important points in the financial time series reduction, but, however, they loss the nature of financial time series which consist of several uptrends, downtrends and sideway trends in different resolutions and in the zigzag directions. In this paper, we propose the zigzag based perceptually important point identification method to collect those zigzag movement important points. Further, we propose zigzag based multiway search tree to index these important points. We evaluate our methods in time series dimensionality reduction. The results show the significant performance comparing to other original method.

关键词： Indexing Fluctuations Time series analysis Discrete wavelet transforms Noise reduction Euclidean distance Time factors Multi-stage noise shaping Shape Principal component analysis

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Dijkstra beats genetic algorithm: Integrating uncomfortable intersection-turns to subjectively optimal route selection

Dijkstra beats genetic algorithm: Integrating uncomfortable ...

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International Conference on Computational Cybernetics (ICCC)

作者： Yasushi Kambayashi Hidemi Yamachi Yasuhiro Tsujimura Hisashi Yamamoto Department of Computer and Information Engineering Nippon Institute of Technology Saitama Japan Faculty of System Design Tokyo Metropolitan University Hino Tokyo Japan

Route selection is one of the most important problems for a car navigation system. Given a pair of origin and destination, there are many possible routes. Most current car navigation systems propose the shortest path from the origin to the destination. Selecting the shortest path is not a hard problem, but the shortest path is not always what the user wants; what the user really wants to have is the most comfortable route for him or her to drive. In other words, the driver wants to have a car navigation system to propose the subjectively optimal route for him or her. Finding such a route requires enumerating all the possible routes, and is known as a NP-complete problem. In order to reduce computational complexity, we employed a GA to find a (subjectively) quasi-optimal route for the driver. In the previous paper, we reported our attempt to integrate uncomfortable-turns to our GA-based route selection algorithm. Even though GA provided a quasi-optimal route in most cases and certainly much faster than exhaustive search, we have found that the classical Dijkstra algorithm can be used to find subjectively the most comfortable route by changing the data structure. In this paper, we show how the data structure that represents routes can be modified to assist Dijkstra's algorithm to find subjectively optimal driving route. The numerical experiments demonstrate the feasibility of our route selection based on Dijkstra algorithm with extended data structure.

关键词： Genetic algorithms Navigation Data structures Genetic engineering Design engineering Roads Cybernetics Cities and towns NP-complete problem Computational complexity

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A study of trust & privacy models in pervasive computing

A study of trust & privacy models in pervasive computing

引用

International Conference for Technical Postgraduates (TECHPOS)

作者： Hamed Khiabani Jamalul-Lail Ab Manan Zailani Mohamed Sidek Faculty of Computer Science and Information System University Technology of Malaysia Kuala Lumpur Malaysia Information Security Cluster Technology Park Malaysia MIMOS Berhad Kuala Lumpur Malaysia

The pervasive systems are weaving themselves in our daily life, making it possible to collect user information invisibly, in an unobtrusive manner by even unknown parties. So trust and privacy would be a major issue in these environments. The huge number of interactions between users and pervasive devices necessitate a comprehensive trust and privacy models which unifies different technologies to precisely calculate trustworthiness of each party and maintain privacy. In this paper we review previous trust and privacy models in pervasive systems and analyze them to highlight the importance of trusted computing platforms in tackling their weaknesses.

关键词： Pervasive computing Humans computer science Information security Authentication Availability Data privacy Application software computer architecture Peer to peer computing

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Modelling and simulation of modified unipolar PWM scheme on a single phase DC-AC converter using PSIM

Modelling and simulation of modified unipolar PWM scheme on ...

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Student Conference on Research and Development (SCOReD)

作者： M. F. N. Tajuddin N. H. Ghazali T. C. Siong N. Ghazali School of Electrical System Engineering Universiti Malaysia Pedis Perlis Malaysia Faculty of Computer Science and Information Technology Universiti Teknologi Malaysia Johor Malaysia

ISBN: (纸本)9781424451869;9781424451876

Pulse-width modulation (PWM) of a signal or power source involves the modulation of its duty cycle, to either convey information over a communications channel or control the amount of power sent to a load. This paper presents work on modelling and simulation of modified unipolar PWM applied to a single phase DC-AC converter (inverter) as switching control schemes. The harmonic analysis for switching algorithm is done and the best parameters which results in less electromagnetic interference noise produced were chosen to be applied on the inverter using PSIM simulation software. The inverter and its LC filters component value are fixed and carefully selected by considering their volumes and prices as it will be applied in a real hardware to ease any future hardware setup.

关键词： Pulse width modulation Pulse width modulation converters Pulse width modulation inverters Communication system control Communication switching Electromagnetic interference Hardware Space vector pulse width modulation Communication channels Switching converters

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TMS320F2812 Digital Signal Processor (DSP) implementation of DPWM

TMS320F2812 Digital Signal Processor (DSP) implementation of...

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Student Conference on Research and Development (SCOReD)

作者： M. F. N. Tajuddin N. H. Ghazali M. F. Mohammed B. Ismail Z. M. Isa T. C. Siong N. Ghazali School of Electrical System Engineering Universiti Malaysia Pedis Perlis Malaysia Faculty of Computer Science and Information Technology Universiti Teknologi Malaysia Johor Malaysia

ISBN: (纸本)9781424451869;9781424451876

This paper presents the programming and use of TMS320F2812 digital signal processor (DSP) in generating the digital pulse width modulation (DPWM). The structure and functions of eZdsp 2812 board used in this work is explained briefly and the steps need to be taken for the programming is explain in detail to control the frequency, the duty cycle and dead band of the generated PWM. The PWM generated by DSP from programming can be used to control and regulate power electronic converters.

关键词： Digital signal processors Digital signal processing Pulse width modulation Pulse generation Signal generators Space vector pulse width modulation Digital modulation Modulation coding Functional programming Frequency

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Using Self-Announcer Approach for Resource Availability Detection in Grid Environment

Using Self-Announcer Approach for Resource Availability Dete...

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International Multi-Conference on Computing in the Global Information technology, ICCGI

作者： Asgarali Bouyer Ehsan Mohebi Abdul Hanan Abdullah Islamic Azad university-Miyandoab branch Miyandoad west Azarbayjan Iran Faculty of Computer Science and Information System University Technology of Malaysia Skudai Johor Malaysia

Since the Grid is a dynamic environment, the detection of available resources and prediction of resource availability in near future is important for resource scheduling. In a Grid environment, prediction and evaluation of resource availability is the prerequisite for a reasonable resource selection and good scheduling guarantee. There are many approaches for discovery and prediction of the resource availability that have some weaknesses (e.g., complexity time, predicting, using out of date data, etc). In this paper, we present a new method for detection of available resource based on online-announcer with no inquiry from Grid scheduler. We use a rough set analysis in each grid node to get some useful rules for predicting about nodepsilas behavior in the grid. The experiment results show that our proposed approach is fast algorithm and it applies effectively a reliable method to predict of proper resources for scheduling.

关键词： Availability Grid computing Processor scheduling Geographic Information systems Information technology computer science Information systems computerized monitoring Databases Finishing

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A Metrics Suite for Measuring Reusability of Learning Objects

A Metrics Suite for Measuring Reusability of Learning Object...

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International Conference on Intelligent systems Design and Applications (ISDA)

作者： Siti Fadzilah Mat Noor Norazah Yusof Siti Zaiton Mohd Hashim Department of Information Science Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Bangi Malaysia Department of Software Engineering Faculty of Computer Science & Information System Universiti Teknologi Malaysia Skudai Malaysia

Learning Object (LO) is one of the main research topics in the E-Learning community in the recent years, and most researchers pay attention to the issue of Learning Object Reusability. The most obvious motivation is the economic interest of reusing learning material instead of repeatedly authoring it. Reusability requires the LO to be in a fine-grain form because raw media elements are often much easier to reuse than aggregate assemblies. In other words, as the LO size decreases (lower granularity), its potential for reuse increases. Therefore, when designing learning objects, reusability must be considered as a key consideration. This paper shows how we adapted and applied some of the metrics from the software engineering field for the purpose of measuring reusability of learning objects.

关键词： Software engineering Software measurement Electronic learning Information science Aggregates Assembly Animation Intelligent systems Application software computer science

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Threats Identification in Healthcare Information systems using Genetic Algorithm and Coz Regression

Threats Identification in Healthcare Information Systems usi...

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The Fifth International Conference on Information Assurance and Security(第五届信息保障与安全国际会议)

作者： Rabiah Ahmad Ganthan Narayana Samy Nuzulha Khilwani Ibrahim Peter A.Bath Zuraini Ismail Centre for Advanced Software Engineering (CASE) Faculty of Computer Science and Information Systems Department of Computer Systems and Communications Faculty of Computer Science and Information System Department of Information Studies University of Sheffield UK Department of Science College of Science and Technology Universiti Teknologi Malaysia (UTM) Malaysia

ISBN: (纸本)9781424451012

Threats to information security for healthcare information system increased tremendously. There are various factors contribute to information security threats, many researchers focused only to certain factors which interest them (e.g., virus attack). Certain factors which may be important remain unexplored. In addition, lack of tools and technologies directed to limited number of threats traced in healthcare system. Thus it introduces bias in threat analysis. This study explored the use of biological computational termed Genetic Algorithm (GAs) combined with Cox regression (CoRGA) in identifying a potential threat for healthcare system. The results show that variable described “misused of e-mail” is the major information security threats for healthcare system. Results were compared with manual analysis using the same data, and it is shows that GAs not just introducing new threats for healthcare system but it was similar with others threats proposed by previous researches.

关键词： Healthcare Information systems (HIS) Risk Analysis Threats Information Security Genetic Algorithm and Coz Regression

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An Approach to Improve the Robustness of Substitution Techniques of Audio Steganography

An Approach to Improve the Robustness of Substitution Techni...

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2009 2nd IEEE International Conference on computer Science and Information technology（ICCSIT 2009）

作者： Mazdak Zamani Azizah Bt Abdul Manaf Rabiah Bt Ahmad Akram M.Zeki Faculty of Computer Science and Information System University of Technology Malaysia 54100 Kuala Lumpur Malaysia College of Science and Technology University of Technology Malaysia 54100 Kuala Lumpur Malaysia Centre for Advanced Software Engineering University of Technology Malaysia 54100 Kuala Lumpur Malaysia

Steganography is a technique used to transmit hidden information by modifying an audio signal in an imperceptible *** transmission must be possible in spite of subsequent imperceptible alterations(attacks)of the modified *** propose a novel approach of substitution technique of audio *** genetic algorithm,message bits are embedded into multiple,vague and higher LSB layers,resulting in increased *** robustness specially would be increased against those intentional attacks which try to reveal the hidden message and also some unintentional attacks like noise addition as well.

关键词： data hiding substitution techniques audio steganography artificial intelligence genetic algorithm.

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Evaluation of P2P overlays for AoI management in Distributed Virtual Environments

Evaluation of P2P overlays for AoI management in Distributed...

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International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Christian Bettinger Rainer Oechsle Markus Esch Hermann Schloss Peter Sturm Department of Computer Science Trier University of Applied Sciences Trier Germany Faculty of Sciences Technology and Communication University of Luxembourg Luxembourg System Software and Distributed Systems University of Trier Trier Germany

Client/Server-based DVE approaches incur scalability and load balancing problems while addressing massive number of users. In order to mitigate these problems P2P overlays are proposed for content provision and management issues instead. However, content provision and management in a distributed manner is much more complicated and requires an exhaustive study of overlay network properties. In order to investigate which kinds of overlay networks suit the requirements stated by DVEs at best, we have performed a comparative evaluation of the deterministic DHT-based Tapestry overlay and the nondeterministic prefix-tree-based P-Grid overlay considering their data location performance and construction cost. In this paper we discuss these evaluation results and exemplarily show how AoI management and content provision can be realized by using the P-Grid overlay.

关键词： Environmental management Virtual environment Avatars Content management Scalability Load management Surges Information retrieval Spine technology management

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