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Information-based dichotomization: A method for multiclass Support Vector Machines

Information-based dichotomization: A method for multiclass S...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： Patoomsiri Songsiri Boonserm Kijsirikul Thimaporn Phetkaew Department of Computer and Technology Mahidol Wittayanusorn School National Science High School of Thailand Department of Computer Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand Department of Computer Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand School of Informatics Walailak University Thailand

Approaches for solving a multiclass classification problem by support vector machines (SVMs) are typically to consider the problem as combination of two-class classification problems. Previous approaches have some limitations in classification accuracy and evaluation time. This paper proposes a novel method that employs information-based dichotomization for constructing a binary classification tree. Each node of the tree is a binary SVM with the minimum entropy. Our method can reduce the number of binary SVMs used in the classification to the logarithm of the number of classes which is lower than previous methods. The experimental results show that the proposed method takes lower evaluation time while it maintains accuracy compared to other methods.

关键词： Artificial neural networks Joints

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An Ontology-Based Sentiment Classification Methodology for Online Consumer Reviews

An Ontology-Based Sentiment Classification Methodology for O...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Jantima Polpinij Aditya K. Ghose Decision Systems Laboratory School of Computer Science and Software Engineering Faculty of Informatics University of Wollongong Wollongong NSW Australia

This paper presents a method of ontology-based sentiment classification to classify and analyse online product reviews of consumers. We implement and experiment with a support vector machines text classification approach based on a lexical variable ontology. After testing, it could be demonstrated that the proposed method can provide more effectiveness for sentiment classification based on text content.

关键词： Ontologies Motion pictures Support vector machines Text categorization Intelligent agent Support vector machine classification Electronic commerce Internet Web search Automotive engineering

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The synthesis level in Bloom’s Taxonomy — a nightmare for an LMS

The synthesis level in Bloom’s Taxonomy — a nightmare for ...

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EAEEIE Annual Conference,

作者： Heinz-Dietrich Wuttke Raimund Ubar Karsten Henke Artur Jutman Faculty Informatics and Automation Ilmenau University of Technology Ilmenau Germany Department of Computer Engineering Tallinn University of Technology Estonia

A lot of learning management systems (LMS) were developed in the last ten years since e-learning opens new possibilities in learning scenarios. They offer the possibility to watch any of the students action on the computer, but possibilities to verify the level of knowledge, a student has reached (accordingly to Bloompsilas taxonomy), are very poor. Multiple choice questions and the like can only verify lower levels in this taxonomy. In this paper we discuss a new approach in verifying higher levels of knowledge in connection with interactive teaching software and online laboratories, which are coupled to an LMS. This work is a result of eight years cooperation between the Tallinn University of Technology and the Ilmenau University of Technology.

关键词： Least squares approximation Education Taxonomy Digital circuits Cognition Software Laboratories

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Teaching digital test with BIST analyzer

Teaching digital test with BIST analyzer

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EAEEIE Annual Conference,

作者： A. Jutman A. Tsertov A. Tsepurov I. Aleksejev R. Ubar H.-D. Wuttke Department of Computer Engineering Tallinn University of Technology Tallinn Estonia Faculty of Informatics and Automation Ilmenau University of Technology Ilmenau Germany

This paper describes a new software tool for high quality training/learning in the field of digital microelectronics. Its main purpose is to give insight into reliability and quality assurance technologies based on linear feedback shift registers (LFSR) and other pseudo-random pattern generators (PRPG). Various PRPG types are becoming the mainstream test generation solution used in built-in self-test (BIST) structures. Taking into account complex theoretical concepts behind the microelectronics self-testing (including data coding and compression, cryptography, field theory, linear programming) it is important to effectively educate engineers in this field. The software tool we present in this paper is aimed at facilitating this goal. Unlike other similar systems, this tool facilitates study of various test optimization problems, allows fault coverage analysis for different circuits and with different LFSR parameters. The main didactic aim of the tool is presenting complicated concepts in a comprehensive graphical and analytical way. The multi-platform JAVA runtime environment allows for easy usage of the tool both in the classroom and at home. The BIST Analyzer represents an integrated simulation, training, and research environment that supports both analytic and synthetic way of learning. Due to the above mentioned facts the tool provides a unique training platform to use in courses on electronic testing and design for testability.

关键词： Built-in self-test Circuit faults Optimization Polynomials Training Testing Microelectronics

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Modelling the power cost of security in Wireless Sensor Networks : The case of 802.15.4

Modelling the power cost of security in Wireless Sensor Netw...

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International Conference on Telecommunications (ICT)

作者： Marcello Mura Fabio Fabbri Maria Giovanna Sami ALaRI Faculty of Informatics University of Lugano Lugano Switzerland Department of Electrical Engineering and Computer Science Politecnico di Milano Milan Italy

Pervasive applications and in particular Wireless Sensors Networks have very strict requirements in terms of power consumption. It is well known that radio activity is very expensive in terms of energy; we show here that intensive processing activities (as security) represent a major contribution to power budget. In this paper we extend our methodology for analyzing the impact of security related operations on power consumption and optimizing it. The analysis is based on experimental data and was validated with measurements on a real platform.

关键词： Security Payloads Computational modeling Power demand Protocols Wireless sensor networks Microwave integrated circuits

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What is the Best Achievable QoS for Unicast Routing in VANETs?

What is the Best Achievable QoS for Unicast Routing in VANET...

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IEEE Globecom Workshops

作者： Mate Boban Geoff Misek Ozan K. Tonguz Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Faculty of Organization and Informatics University of Zagreb Varazdin Croatia

Significant efforts and studies were recently reported for enabling active safety, traffic management, and commercial applications in Vehicular Ad Hoc Networks (VANET), since these applications are the drivers of the recent surge in VANET research and development. However, very few research efforts considered analyzing the Quality of Service (QoS) metrics that will be available to these applications in VANET. Furthermore, although there are many proposed solutions for routing in VANET, it is still unclear as to what specific characteristics VANET routing protocols should possess, since none of the proposed solutions achieves optimum performance in both urban and highway, as well as sparse and dense environment. To shed light on these issues, in this paper we analyze some of the most important QoS metrics in VANET. Namely, we determine the upper performance bound for connection duration, packet delivery ratio, end-to-end delay, and jitter for unicast communication in typical highway and urban VANET environments. According to our results, delay and jitter in VANET would be adequate for most of the envisioned unicast-based applications, whereas the packet delivery ratio and connection duration might not meet the requirements for most unicast-based applications.

关键词： Unicast Routing Quality of service Road transportation Delay Jitter Safety Telecommunication traffic Research and development management Ad hoc networks

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Raising the effectivity of e-learning systems with use of intelligent principles

Raising the effectivity of e-learning systems with use of in...

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International Conference on Computational Cybernetics (ICCC)

作者： Igor Sivy Marian Bucko Ladislav Madarasz Department of Computer and Informatics Technical University of Košice Kosice Slovakia Department of Cybernetics and Artificial Intelligence Faculty of Electrical Engineering and Informatics Technical University of Košice Kosice Slovakia

E-learning systems are powerful way for bringing the education to people, which wants to be skilled in some area. However, important term in education is quality of this education. Student must have effort to study, and e-learning system must also have tools for bringing educational informations in simplest way, or support learners study as much as it's possible. In present, main problem of e-learning systems is generalisation of learners, it means that all students can take only the same teaching material. In the related way, these informations are served a little bit chaotic and cold". Solving for this problem could be intelligent e-learning systems (IELS) that are e-learning systems, which have build-in intelligence support (algorithms) for learner's study. Next reason for building IELS is attempt for substitution of the teacher. It's not possible to make absolute substitution for the teacher, but scientific conferences all over the world still brings important conclusions in this area, which can help build interesting systems.

关键词： Electronic learning Education Artificial intelligence informatics Cybernetics Problem-solving Information analysis System testing Intelligent systems

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Code Generation from Statecharts: Simulation of Wireless Sensor Networks

Code Generation from Statecharts: Simulation of Wireless Sen...

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Euromicro Symposium on Digital System Design

作者： Marcello Mura Maria Giovanna Sami ALaRI Faculty of Informatics University of Lugano Lugano Switzerland Department of Electrical Engineering and Computer Science Politecnico di Milano Milan Italy

Automatic generation of code starting from lightweight modeling languages such as UML is by now a widely adopted approach. In particular generation of executable SystemC models starting from StateCharts and other UML diagrams represents a promising research field. While RTL SystemC appears better suited for matching the StateCharts formalism (being intrinsically clocked), performances of the generated code suffer from the heavy overhead induced by time management, specially when the number of concurrent processes is high. In this paper we present a methodology that allows applying a solution mixing event based and clock-driven approach. More specifically, clock-driven simulation is activated only when the configuration of the system is identified to be evolving. When no events are present this fact is also detected (together with the interval of absence of events) so that no simulation is performed although the clock runs on. This solution is particularly suited for low duty cycle systems, as, e.g. when simulating Wireless Sensor Networks (WSN); in such instances, speedup of the generated code has been found to be well over two orders of magnitude. Application of the technique to the generation of a power simulator for the IEEE 802.15.4 networking protocol is used as a test case.

关键词： Wireless sensor networks Clocks Mathematical model Unified modeling language Discrete event simulation Power system modeling Protocols Power generation Testing Digital systems

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Quantitative approaches in object-oriented software engineering

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21st European Conference on Object-Oriented Programming, ECOOP 2007

作者： Guéhéneuc, Yann-Gaël Lange, Christian F. J. Sahraoui, Houari A. Falcone, Giovanni Lanza, Michele Calero, Coral Brito E Abreu, Fernando Department of Computer Science and Operations Research Université de Montréal Canada Software Engineering and Technology Group Eindhoven University of Technology Netherlands Lehrstuhl für Softwaretechnik Universität Mannheim Germany Faculty of Informatics University of Lugano Switzerland Department of Computer Science Escuela Superior de Informatica-Castilla-La Mancha University Spain Department of Computer Science Lisbon New University Portugal

ISBN: (纸本)3540781943

The QAOOSE 2007 workshop brought together, for half day, researchers working on several aspects related to quantitative evaluation of software artifacts developed with the object-oriented paradigm and related technologies. Ideas and experiences were shared and discussed. This report includes a summary of the technical presentations and subsequent discussions raised by them. Exceptionally this year, one of the founders of the workshop, Horst Zuse, gave a keynote on the Theoretical Foundations of Object-Oriented Measurement. Three out of the four submitted position papers were presented, covering different aspects such as measuring inconsistencies, visualizing metric values, and assessing the subjective quality of systems. In the closing session, the participants discussed open issues and challenges arising from researching in this area and tried to forecast what will be hot research topics in the short and medium terms. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Object oriented programming

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N-Most Interesting Closed Itemset Mining

N-Most Interesting Closed Itemset Mining

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International Conference on Convergence Information Technology

作者： Panida Songram Veera Boonjing Department of Mathematics and Computer Science Faculty of Science King Mongkuts Institute of Technology Ladkrabang Software Systems Engineering Laboratory Bangkok Thailand Department of Computer Science Faculty of Informatics Mahasarakham University Mahasarakham Thailand

In this paper, we propose an efficient algorithm, NCLOSED, for mining the N k-closed itemsets with the highest supports for 1 up to a certain k max value. The algorithm adopts best-first search strategy to generate closed itemsets with highest remaining supports. It does not keep closed itemsets mined in main memory to ensure that they are really closed. This is because this algorithm can directly generate closed itemsets. Moreover, duplicated closed itemsets are detected and discarded from this algorithm.

关键词： Itemsets Data mining computer science Information technology Software systems Systems engineering and theory Laboratories Mathematics informatics Software algorithms

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