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A Decentralized Intrusion Detection System for Increasing Security of Wireless Sensor Networks

A Decentralized Intrusion Detection System for Increasing Se...

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12th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2007), vol.3

作者： Ioannis Chatzigiannakis Andreas Strikos Research Academic Computer Technology Institute (RACTI) and Computer Engineering and Informatics Department University of Patras Greece School of Information and Communication Technology KTH Stockholm Sweden

Large-scale sensor networks, monitoring an environment at close range with high spatial and temporal resolutions are expected to play an important role in various applications, e.g., assessing the "health" of machines;environmental, medical, food-safety, and habitat monitoring;inventory control, building automation, etc. Ensuring the security of these complex and yet resource-constrained systems has emerged as one of the most pressing challenges for researchers. In this paper (i) we present the major threats, and (ii) we present a new approach for decentralized energy efficient intrusion detection that can be used to improve security from both external and internal adversaries.

关键词： Intrusion detection Wireless sensor networks Biomedical monitoring computerized monitoring Condition monitoring Large-scale systems Spatial resolution Inventory control Automation Pressing

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Defending Wireless Sensor Networks from Jamming Attacks

Defending Wireless Sensor Networks from Jamming Attacks

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Aristides Mpitziopoulos Damianos Gavalas Grammati Pantziou Charalampos Konstantopoulos Department of Cultural Technology and Communication University of Aegean Mytilene Greece Research Academic Computer Technology Institute and Department of Computer Engineering and Informatics University of Patras Rio Greece

Wireless sensor networks (WSNs) are used in many applications which often include the monitoring and recording of sensitive information. Hence, their critical importance raises many security concerns. In the context of WSNs, jamming is the type of attack which interferes with the radio frequencies used by network nodes. In the event that an attacker uses a rather powerful jamming source, disruptions of WSNs proper function are likely to occur. As a result, the use of countermeasures against jamming in WSN environments is of immense importance. The main contribution of this article is the discussion of various defence methods against jamming that would allow a WSN to survive and work properly in a hostile jamming environment. Our focus is on frequency hopping spread spectrum (FHSS) and direct sequence spread spectrum (DSSS), two of the most effective countermeasures against jamming. We suggest the use of a specific FHSS technique in 5 GHz band with 55 frequency channels wherein the channel sequence is generated using a secret word, known only to the sink and the sensor nodes, as a seed. Each channel uses DSSS modulation with 16 bit Pseudo Noise (PN) code, which derives from the same secret word used for FHSS channel generation.

关键词： Wireless sensor networks Jamming Spread spectrum communication Educational technology Mobile communication Protocols Cultural differences Global communication Communications technology informatics

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Opinion analysis across languages: An overview of and observations from the NTCIR6 opinion analysis pilot task

Opinion analysis across languages: An overview of and observ...

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7th International Workshop on Fuzzy Logic and Applications, WILF 2007

作者： Evans, David Kirk Ku, Lun-Wei Seki, Yohei Chen, Hsin-Hsi Kando, Noriko National Institute of Informatics Tokyo Japan Dept. of Information and Computer Sciences Toyohashi University of Technology Japan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9783540733997

In this paper we introduce the NTCIR6 Opinion Analysis Pilot Task, information about the Chinese, Japanese, and English data, plans for future opinion analysis tasks at NTCIR, and a brief overview of the evaluation results. This pilot task is a sentence-level opinion identification and polarity detection task run over data from a comparable corpus in three languages: Chinese, English, and Japanese. We have manually annotated documents for this task in each language, producing what we believe to be the first multilingual opinion analysis data set over comparable data. Six participants submitted Chinese system results, three Japanese, and six English for this pilot task. We plan to release the data to the research community, and hope to spur further research into cross-lingual opinion analysis and its use in other NLP tasks. In particular, we look forward to researchers using this data to investigate cross-cultural perspective differences based on automatic sentiment analysis. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Formal languages

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Trust in global computing systems as a limit property emerging from short range random interactions

Trust in global computing systems as a limit property emergi...

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International Conference on Availability, Reliability and Security, ARES

作者： V. Liagkou E. Makri P. Spirakis Y.C. Stamatiou Department of Computer Engineering and Informatics University of Patras Greece Research Academic Computer Technology Institute Greece Department of Mathematics University of Aegean Greece Department of Computer Engineering and Informatics University of Patras Patras Greece Mathematics Department University of Ioannina (UoI) Greece

ISBN: (纸本)9780769527758;0769527752

Today we are experiencing a major reconsideration of the computing paradigm, as witnessed by the abundance and increasing frequency of use of terms such as ambient intelligence, ubiquitous computing, disappearing computer, grid computer, global computing and mobile ad-hoc networks. Systems that can be described with such terms are of a dynamic, with no clear physical boundary, nature and it seems that it is impossible (or, at least, difficult) to define sharply a number of important properties holding with certainty as well as holding throughout the whole lifetime of the system. One such system property, which is important for the viability of a system, is trust. Our departure point is the assumption that it seems very difficult to define static system properties related to trust and expect that they hold eternally in the rapidly changing systems falling under the new computing paradigm. One should, rather, attempt to define trust in terms of properties that hold with some limiting probability as the system grows and try to establish conditions that ensure that "good" properties hold almost certainly. Based on this viewpoint, in this paper we provide a new framework for defining trust through formally definable properties that hold, almost certainly, in the limit in randomly growing combinatorial structures that model "shapeless" computing systems (e.g., ad-hoc networks), drawing on results that establish the threshold behavior of predicates written in the first and second order logic

关键词： computer networks Grid computing Pervasive computing informatics Mathematics Ad hoc networks Logic Mechanical factors Protocols Management information systems

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Business Models for Broadband Municipal Optical Networks: A Proposed Model for the Greek Case

Business Models for Broadband Municipal Optical Networks: A ...

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IEEE Symposium on computers and Communications (ISCC)

作者： Christos Bouras Apostolos Gkamas John Papagiannopoulos George Theophilopoulos Thrasyvoulos Tsiatsos Computer Engineering and Informatics Dept University of Patras Greece Research Academic Computer Technology Institute Greece Department of Information and Communication Systems Engineering University of Aegean Greece Department of Informatics Aristotle University of Thessaloniki Greece

This paper proposes a business model for the successful operation of the currently developing broadband metropolitan area networks in Greece. Having recorded and examined relevant international practices, we describe in detail the way that these networks should be managed, operated, maintained and expanded. Taking into consideration that these infrastructures will alter the broadband map of Greece widely, that Greece currently has one of the lowest broadband penetration percentages in Europe and that the proper exploitation of the networks to be deployed could boost the demand for broadband connections and applications, the proposition of the business model appears to be of vital importance. We present the proposed business model in detail including information regarding network management and network expansion of the broadband metropolitan networks and viability issues regarding the authority which will manage the broadband metropolitan networks.

关键词： Optical fiber networks Telecommunication services Metropolitan area networks Business communication computer networks Optical computing Cities and towns Internet Costs informatics

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Mining Trajectory Databases via a Suite of Distance Operators

Mining Trajectory Databases via a Suite of Distance Operator...

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International Conference on Data engineering Workshops

作者： Nikos Pelekis Ioannis Kopanakis Irene Ntoutsi Gerasimos Marketos Yannis Theodoridis Department of Informatics University of Piraeus Greece Technological Educational Institute of Crete Greece Research Academic Computer Technology Institute Greece

With the rapid progress of mobile devices and positioning technologies, Trajectory databases (TD) have been in the core of database research during the last decade. Analysis and knowledge discovery in TD is an emerging field which has recently gained great interest. Extracting knowledge from TD using certain types of mining techniques, such as clustering and classification, impose that there is a mean to quantify the distance between two trajectories. Having as a main objective the support of effective similarity query processing, existing approaches utilize generic distance metrics that ignore the peculiarities of the trajectories as complex spatio-temporal data types. In this paper, we define a novel set of trajectory distance operators based on primitive (space and time) as well as derived parameters of trajectories (speed and direction). Aiming at providing a powerful toolkit for analysts who require producing distance matrices with different semantics as input to mining tasks, we develop algorithms for each of the proposed operators. The efficiency of our approach is evaluated through an experimental study on classification and clustering tasks using synthetic and real trajectory datasets.

关键词： Databases Educational technology Spatiotemporal phenomena Query processing Humans Data analysis Sampling methods Pattern analysis informatics Mobile computing

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Exploiting virtual objects' attributes and avatar's behavior in DVEs partitioning

Exploiting virtual objects' attributes and avatar's behavior...

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International Conference on Artificial Reality and Telexistence (ICAT)

作者： Christos Bouras Eri Giannaka Thrasyvoulos Tsiatsos Computer Engineering and Informatics Department University of Patras Patras Greece University of Patras Patras GR Research Academic Computer Technology Institute University of Patras Patras Greece Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece

Partitioning constitutes one of the most critical challenges a distributed virtual environment needs to handle and is related to the efficient assignment of the existing entities of the virtual world to the available resources of the system. The efficient partitioning arises from the need of high consistency maintenance among participating users' view, as virtual reality applications are characterized by the high degree of realism they aim to achieve. To the direction of partitioning algorithms, a lot of work has been done, which has been more intense due to the evolution of network technologies and the familiarization of users with virtual reality systems. This paper presents a partitioning approach, which is based on the degree of interaction of each virtual object and the behavior of the participating users, in terms of moving trends, which is usually directed by the actions they can perform on the surrounding objects. In particular, the partitioning takes place when the virtual world contains only objects, in the sense that no avatars are yet connected and objects' attributes are handled as indicators for avatars' future behavior in the system. This prediction of avatars' behavior based on objects' attributes defines the initial partitioning of the virtual space.

关键词： Virtual environment Avatars Partitioning algorithms Virtual reality Network servers Distributed computing informatics Large-scale systems Negative feedback Costs

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Scalable Data Collection Protocols for Wireless Sensor Networks with Multiple Mobile Sinks

Scalable Data Collection Protocols for Wireless Sensor Netwo...

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Annual Symposium on Simulation

作者： Athanasios Kinalis Sotiris Nikoletseas Department of Computer Engineering and Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece

Data propagation in wireless sensor networks is usually performed as a multihop process. To deliver a single message, the resources of many sensor nodes are used and a lot of energy is spent. Recently, a novel approach is catching momentum because of important applications; that of having a mobile sink move inside the network area and collects the data with low energy cost. Here we extend this line of research by proposing and evaluating three new protocols. Our protocols are novel in a) investigating the impact of having many mobile sinks; b) in weak models with restricted mobility, proposing and evaluating a mix of static and mobile sinks; and c) proposing a distributed protocol that tends to equally spread the sinks in the network to further improve performance. Our protocols are simple, based on randomization and assume locally obtainable information. We perform an extensive evaluation via simulation; our findings demonstrate that our solutions scale very well with respect to the number of sinks and significantly reduce energy consumption and delivery delay

关键词： Wireless application protocol Wireless sensor networks Intelligent sensors Costs Monitoring Sensor phenomena and characterization Spread spectrum communication Energy consumption Contracts Batteries

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Wheat and hazelnut inspection with impact acoustics time-frequency patterns

Wheat and hazelnut inspection with impact acoustics time-fre...

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2007 ASABE Annual International Meeting, Technical Papers

作者： Ince, Nuri F. Onaran, Ibrahim Tewfik, Ahmed H. Kalkan, Habil Pearson, Tom Cetin, A. Enis Yardimci, Yasemin Department of Electrical and Computer Engineering University of Minnesota United States Department of Electrical and Electronics Engineering Bilkent University Turkey Informatics Institute Middle East Technical University Turkey United States Department of Agriculture Agricultural Research Service United States

Kernel damage caused by insects and fungi is one of the most common reason for poor flour quality. Cracked hazelnut shells are prone to infection by cancer producing mold. We propose a new adaptive time-frequency classification procedure for detecting cracked hazelnut shells and damaged wheat kernels using impact acoustic emissions recorded by dropping wheat kernels or hazelnut shells on a steel plate. The proposed algorithm is based on a flexible local discriminant bases (F-LDB) procedure. The F-LDB method combines local cosine packet analysis and a frequency axis clustering approach which supports individual time and frequency band adaptation. Discriminant features are extracted from the adaptively segmented acoustic signal, sorted according to a Fisher class separability criterion, post processed by principal component analysis and fed to linear discriminant. We describe experimental results that establish the superior performance of the proposed approach when compared with prior techniques reported in the literature or used in the field. Our approach achieved classification accuracy in paired separation of undamaged wheat kernels from IDK, Pupae and Scab damaged kernels with 96%, 82% and 94%. For hazelnuts the accuracy was 97.1%.

关键词： Crops

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The differential effects of female only vs. co-ed enrichment programs on middle school students' attitudes toward science, mathematics and engineering

The differential effects of female only vs. co-ed enrichment...

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114th Annual ASEE Conference and Exposition, 2007

作者： Hirsch, Linda Carpinelli, John Kimmel, Howard Rockland, Ronald Bloom, Joel New Jersey Institute of Technology United States Center for Pre-College Programs United States Department of Electrical and Computer Engineering Center for Pre-College Programs New Jersey Institute of Technology United States Department of Chemical Engineering Newark College of Engineering United States Department of Engineering Technology and Biomedical Engineerings Academic and Student Services United States Albert Dorman Honors College

The Center for Pre-College Programs at New Jersey institute of technology offers a series of summer programs designed to increase academically talented students' interest in the fields of science, mathematics, engineering and technology in an effort to increase the number of young students, particularly girls and other traditionally underrepresented minorities, who pursue technological careers. One program in particular, Woman in engineering and technology, called FEMME, was designed specifically for young women in an effort to increase the number of women interested in engineering and other technological careers. Most of the programs span grades four to eight because middle school is such an important time for all students to begin thinking about future careers. research on engineering recruitment indicates that many students, particularly young girls, do not know about engineering careers and have few adults or peers discussing careers in engineering with them. As a result not enough students explore engineering or other technical fields as a career option and therefore do not prepare academically. Programs such as those offered by the Center for Pre-College Programs can be instrumental in informing young students about careers in engineering and technology and assure they receive the academic background required to study for these careers in college. Further, because boys and girls do not differ much in technical abilities but rather in their attitudes toward technological careers including engineering until the later high school years, single-gender programs like FEMME can be particularly effect in reaching young girls and changing their attitudes. Initial evaluations of the FEMME program have been positive but they have been primarily formative in nature. The Middle School Students' Attitude to engineering, Science and Mathematics Survey has been developed to measure middle school students' overall attitudes to engineering, mathematics and science;their knowled

关键词： Curricula

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