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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...

引用

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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Code Generation from Statecharts: Simulation of Wireless Sensor Networks

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

引用

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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Mining Top-K Closed Itemsets Using Best-First Search

Mining Top-K Closed Itemsets Using Best-First Search

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International Conference on computer and Information Technology (CIT)

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

In this paper, we proposed an efficient algorithm, TOPK_CLOSED, for mining top-k closed itemsets. This algorithm mines top-k closed itemsets using best-first search. The closed itemsets with the highest supports are firstly found from this algorithm. Consequently, the method quickly finds top-k closed itemsets, which leads to an efficient pruning unnecessary itemsets and stop mining rapidly. In addition, this algorithm can generate closed itemsets without keeping candidates in main memory.

关键词： Itemsets Generators Data mining Pediatrics Complexity theory Algorithm design and analysis Databases

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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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Everything You Ever Wanted to Learn from the Semantic Web but Were Unable to Ask

Everything You Ever Wanted to Learn from the Semantic Web bu...

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International Conference on Advanced engineering Computing and Applications in Sciences (ADVCOMP)

作者： Jirí Dokulil Jakub Yaghob Jana Katreniaková Department of Software Engineering Faculty of Mathematics and Physics Charles University Prague Czech Republic Department of Computer Science Faculty of Mathematics Physics and Informatics Comenius University Bratislava Slovakia

One way to see the semantic Web is to think of it as a set of all-knowing technologies that respond to whatever the user asks. The other view is that it is a set of standards and tools that help build better Web applications. Since the latter is probably more realistic at the moment, it means that a lot of software has to be developed before we start actually seeing the semantic Web in widespread *** developers would be needed for the task and unless we "win their hearts and minds", they are likely to obstruct rather than support the semantic Web idea. And from the average developer's point of view, there is not much to like on today's RDF query languages, especially when compared with relational algebra and SQL. Besides the fact that they are built on different principles, none of the languages we are aware of has a property that has served SQL so well - they are not closed.

关键词： Semantic web Resource description format Database languages Electronic mail Real time systems Pattern matching Standards

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Teaching Team Software Process in Graduate Courses to Increase Productivity and Improve Software Quality

Teaching Team Software Process in Graduate Courses to Increa...

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： Bayona O. Sussy Jose A. Calvo-Manzano Cuevas Gonzalo San Feliu Tomás Languages Informatics Systems and Software Engineering Department Faculty of Computer Science Polytechnic University of Madrid Madrid Spain Languages Campus Montegancedo Madrid Spain

This paper presents a case study that describes TSPi teaching (introduction to the team software process) to 4th year students, grouped by teams, at the computer Science School, Polytechnic University of Madrid (UPM). The achievements of the teams, due to training and the use of TSPi, were analyzed and discussed. This paper briefly discusses the approach to the teaching and some of the issues that were identified. The teams collected data on the projects developed. They reviewed the schedule and quality status weekly. The metrics selected to analyze the impact on the students were: size, effort, productivity, costs and defects density. These metrics were chosen to analyze teams 'performance evolution through project development. This paper also presents a study related to the evolution of estimation, quality and productivity improvements these teams obtained. This study will prove that training in TSPi has a positive impact on getting better estimations, reducing costs, improving productivity, and decreasing defect density. Finally, the teams 'performance are analyzed.

关键词： Software Training Estimation Productivity Education Accuracy Programming

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Examples of using technology in teaching Human—computer Interaction according to the Bologna process

Examples of using technology in teaching Human—Computer Int...

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International Conference on Information Technology Interfaces

作者： Matjaz Debevc Primoz Kosec Andreas Holzinger Faculty for Electrical Engineering and Computer Science Maribor Slovenia Institute of Medical Informatics Statistics and Documentation RU HCI4MED Graz Austria

ISBN: (纸本)9789537138127

The abundance of information and communication technology and especially internet services demands changes in lecturerspsila head-on teaching methods towards new directives. This article presents some examples of human-centred use of information technology, applied in the subject of human-computer interaction. Examples include the open source learning management system moodle, video based lecturing, remote laboratory of intelligent house and an age simulator - AgeSim. This article presents the planning and execution of teaching processes with use of Moodle Web tools and exposes organizational structure as well as characteristics, which appeared during the learning process. Finally we show some benefits and weaknesses that arose during the use of the Moodle environment.

关键词： Materials Streaming media User interfaces Laboratories Education Graphical user interfaces Mobile communication

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An extensible query language for content based image retrieval based on Lucene

An extensible query language for content based image retriev...

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International Conference on computer and Information Technology (CIT)

作者： Raoul Pascal Pein Joan Lu Renz Wolfgang Multimedia Systems Laboratory (MMLab) Faculty of Engineering and Computer Science University of Applied Sciences Hamburg Germany Department of Informatics School of Computing and Engineering University of Huddersfield Huddersfield UK Multimedia Systems Laboratory (MMLab) Faculty of Engineering and Computer Science Hamburg University of Applied Sciences Berliner Tor 7 20099 Germany

One of the most important bits of every search engine is the query interface. Complex interfaces may cause users to struggle in learning the handling. An example is the query language SQL. It is really powerful, but usually remains hidden to the common user. On the other hand the usage of current languages for Internet search engines is very simple and straightforward. Even beginners are able to find relevant documents. This paper presents a hybrid query language suitable for both image and text retrieval. It is very similar to those of a full text search engine but also includes some extensions required for content based image retrieval. The language is extensible to cover arbitrary feature vectors and handle fuzzy queries.

关键词： Plugs Database languages Image retrieval Engines Feature extraction Search engines Histograms

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Fast Information Sharing in Networks of Autonomous Agents

Fast Information Sharing in Networks of Autonomous Agents

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2008 American Control Conference (ACC), vol.10

作者： Feng Xiao Long Wang Yingmin Jia Languages Informatics Systems and Software Engineering Department Faculty of Computer Science Peking University Beijing China Seventh Research Division Beihang University Beijing China

A new nonlinear protocol is proposed for state consensus of multi-agent systems in this paper. It is shown that this protocol can provide faster convergence rate than the typical linear protocol, presented by Olfati-Saber and Murray, and furthermore guarantees the states of agents reach a consensus in finite time, provided that the interaction topology, represented by a directed graph, has a spanning tree.

关键词： Multi-agent systems coordination finite-time consensus interaction topology

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