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1st Workshop on Services and Applications Over Linked APIs and Data, SALAD 2013 - Co-located with the 10th Extended Semantic Web Conference, ESWC 2013

作者： Koutsomitropoulos, Dimitrios A. Kalou, Aikaterini K. Solomou, Georgia D. Computer Engineering and Informatics Dpt. University of Patras Building B Patras-Rio26500 Greece

Upfront Semantic Web applications are often lacking desirable fea-tures related to their 'Web' part, despite the novelties and acknowledged added-value introduced with them. On the other hand, characteristics like front-end in-tuitiveness, dynamic content rendering and streamlined user management have been dealt with, elaborated and improved over the course of many years in the world of traditional CMSs. Instead of reinventing the wheel, in this paper we propose an example of how these features can be successfully integrated within a Semantic Web application, by taking advantage of an existing CMS infra-structure. In particular, we present our semantic book mashup, which combines Web APIs with semantics in order to produce personalized book recommenda-tions, and explain how this can be interweaved with Drupal. It is shown that this approach not only leaves reasoning expressiveness and effective ontology management uncompromised, but comes to their benefit. Copyright © 2013 for the individual papers by the papers' authors.

关键词： Semantic Web

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Dynamic Time Warping Averaging of Time Series Allows Faster and More Accurate Classification

Dynamic Time Warping Averaging of Time Series Allows Faster ...

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IEEE International Conference on Data Mining (ICDM)

作者： François Petitjean Germain Forestier Geoffrey I. Webb Ann E. Nicholson Yanping Chen Eamonn Keogh Faculty of IT Monash University Melbourne Australia MIPS (EA 2332) Université de Haute Alsace Mulhouse France Computer Science and Engineering Dpt University of California Riverside USA

Recent years have seen significant progress in improving both the efficiency and effectiveness of time series classification. However, because the best solution is typically the Nearest Neighbor algorithm with the relatively expensive Dynamic Time Warping as the distance measure, successful deployments on resource constrained devices remain elusive. Moreover, the recent explosion of interest in wearable devices, which typically have limited computational resources, has created a growing need for very efficient classification algorithms. A commonly used technique to glean the benefits of the Nearest Neighbor algorithm, without inheriting its undesirable time complexity, is to use the Nearest Centroid algorithm. However, because of the unique properties of (most) time series data, the centroid typically does not resemble any of the instances, an unintuitive and underappreciated fact. In this work we show that we can exploit a recent result to allow meaningful averaging of 'warped' times series, and that this result allows us to create ultra-efficient Nearest 'Centroid' classifiers that are at least as accurate as their more lethargic Nearest Neighbor cousins.

关键词： Time series analysis Accuracy Classification algorithms Training Artificial neural networks Prototypes Heuristic algorithms

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Do points, levels and leaderboards harm intrinsic motivation? An empirical analysis of common gamification elements 13

Do points, levels and leaderboards harm intrinsic motivation...

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1st International Conference on Gameful Design, Research, and Applications, Gamification 2013

作者： Mekler, Elisa D. Brühlmann, Florian Opwis, Klaus Tuch, Alexandre N. Center for Cognitive Psychology and Methodology University of Basel Switzerland Dpt. of Computer Science University of Copenhagen Denmark

ISBN: (纸本)9781450328159

It is heavily debated within the gamification community whether specific game elements may actually undermine users' intrinsic motivation. This online experiment examined the effects of three commonly employed game design elements - points, leaderboard, levels - on users' performance, intrinsic motivation, perceived autonomy and competence in an image annotation task. Implementation of these game elements significantly increased performance, but did not affect perceived autonomy, competence or intrinsic motivation. Our findings suggest that points, levels and leaderboards by themselves neither make nor break users' intrinsic motivation in non-game contexts. Instead, it is assumed that they act as progress indicators, guiding and enhancing user performance. While more research on the contextual factors that may potentially mediate the effects of game elements on intrinsic motivation is required, it seems that the implementation of points, levels, and leaderboards is a viable means to promote specific user behavior in non-game contexts. Copyright © 2013 ACM.

关键词： Motivation

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The impact of demographics (age and gender) and other user-characteristics on evaluating recommender systems

The impact of demographics (age and gender) and other user-c...

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International Conference on Theory and Practice of Digital Libraries, TPDL 2013

作者： Beel, Joeran Langer, Stefan Nürnberger, Andreas Genzmehr, Marcel Docear Germany Otto-von-Guericke University Dpt. of Computer Science DKE Group Magdeburg Germany

ISBN: (纸本)9783642405006

In this paper we show the importance of considering demographics and other user characteristics when evaluating (research paper) recommender systems. We analyzed 37,572 recommendations delivered to 1,028 users and found that elderly users clicked more often on recommendations than younger ones. For instance, 20-24 years old users achieved click-through rates (CTR) of 2.73% on average while CTR for users between 50 and 54 years was 9.26%. Gender only had a marginal impact (CTR males 6.88%;females 6.67%) but other user characteristics such as whether a user was registered (CTR: 6.95%) or not (4.97%) had a strong impact. Due to the results we argue that future research articles on recommender systems should report detailed data on their users to make results better comparable. © 2013 Springer-Verlag.

关键词： Recommender systems

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Patient-specific models from inter-patient biological models and clinical records 14

Patient-specific models from inter-patient biological models...

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Formal Methods in computer Aided Design (FMCAD)

作者： E. Tronci T. Mancini I. Salvo S. Sinisi F. Mari I. Melatti A. Massini F. Davì T. Dierkes R. Ehrig S. Röblitz B. Leeners T.H.C. Krüger M. Egli F Ille Computer Science Department Sapienza University of Rome Computational Systems Biology Group Zuse Institute Berlin Division of Reproductive Endocrinology University Hospital Zurich Dpt. of Psychiatry Social Psychiatry and Psychotherapy Hannover Medical School CC Aerospace Biomedical Science & Tech. Luzern Univ. of Appl. Sciences & Arts

ISBN: (纸本)9780983567844

One of the main goals of systems biology models in a health-care context is to individualise models in order to compute patient-specific predictions for the time evolution of species (e.g., hormones) concentrations. In this paper we present a statistical model checking based approach that, given an inter-patient model and a few clinical measurements, computes a value for the model parameter vector (model individualisation) that, with high confidence, is a global minimum for the function evaluating the mismatch between the model predictions and the available measurements. We evaluate effectiveness of the proposed approach by presenting experimental results on using the GynCycle model (describing the feedback mechanisms regulating a number of reproductive hormones) to compute patient-specific predictions for the time evolution of blood concentrations of E2 (Estradiol), P4 (Progesterone), FSH (Follicle-Stimulating Hormone) and LH (Luteinizing Hormone) after a certain number of clinical measurements.

关键词： Computational modeling Biological system modeling Barium Predictive models Evolution (biology) Biochemistry

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Secure image encryption based on a chua chaotic noise generator

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Journal of engineering science and Technology Review 2013年第4期6卷 90-103页

作者： Andreatos, A.S. Leros, A.P. Div. of Computer Engineering and Information Science Hellenic Air Force Academy Dekeleia Air Force Base Dekeleia Attica TGA-1010 Greece Dpt. of Automation School of Technological Applications Technological Educational Institute of Chalkis 34400 Psachna Evia Greece

This paper presents a secure image cryptography telecom system based on a Chua's circuit chaotic noise generator. A chaotic system based on synchronised Master-Slave Chua's circuits has been used as a chaotic true random number generator (CTRNG). Chaotic systems present unpredictable and complex behaviour. This characteristic, together with the dependence on the initial conditions as well as the tolerance of the circuit components, make CTRNGs ideal for cryptography. In the proposed system, the transmitter mixes an input image with chaotic noise produced by a CTRNG. Using thresholding techniques, the chaotic signal is converted to a true random bit sequence. The receiver must be able to reproduce exactly the same chaotic noise in order to subtract it from the received signal. This becomes possible with synchronisation between the two Chua's circuits: through the use of specific techniques, the trajectory of the Slave chaotic system can be bound to that of the Master circuit producing (almost) identical behaviour. Additional blocks have been used in order to make the system highly parameterisable and robust against common attacks. The whole system is simulated in Matlab. Simulation results demonstrate satisfactory performance, as well as, robustness against cryptanalysis. The system works with both greyscale and colour jpg images. © 2013 Kavala Institute of Technology.

关键词： Synchronization

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Log2cloud: Log-based prediction of cost-performance trade-offs for cloud deployments 13

Log2cloud: Log-based prediction of cost-performance trade-of...

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28th Annual ACM Symposium on Applied Computing, SAC 2013

作者： Perez-Palacin, Diego Calinescu, Radu Merseguer, José Dpt. de Informática e Ingeniería de Sistemas Universidad de Zaragoza Spain Department of Computer Science University of York United Kingdom

ISBN: (纸本)9781450316569

Numerous organisations are considering moving at least some of their existing applications to the cloud. A key motivating factor for this fast-paced adoption of cloud is the expectation of cost savings. Estimating what these cost savings might be requires comparing the known cost of running an application in-house with a predicted cost of its cloud deployment. A major problem with this approach is the lack of suitable techniques for predicting the cost of the virtual machines (VMs) that a cloud-deployed application requires in order to achieve a given service-level agreement. We introduce a technique that addresses this problem by using established results from queueing network theory to predict the minimum VM cost of cloud deployments starting from existing application logs. We describe how this formal technique can be used to predict the cost-performance trade-offs available for the cloud deployment of an application, and presents a case study based on a real-world webmail service. Copyright 2013 ACM.

关键词： Computation theory

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Linear Quadratic Optimal Trajectory-Tracking Control of a Longitudinal Thrust Vectoring-Enabled Unmanned Tri-TiltRotor

Linear Quadratic Optimal Trajectory-Tracking Control of a Lo...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Christos Papachristos Kostas Alexis Anthony Tzes Electrical & Computer Engineering Dpt. University of Patras Autonomous Systems Lab ETH Zurich Electrical & Computer Engineering Dpt. University of Patras

ISBN: (纸本)9781479902255

The optimal trajectory-tracking control of a Tri-TiltRotor Unmanned Aerial Vehicle is the subject of this paper. This specific UAV design possesses the capability to control the orientation of its main rotors, thus enabling operation in both the Vertical Take-Off and Landing as well as the Fixed-Wing flight mode configuration. The translational controller developed is based on a Linear-Quadratic tracking scheme. Additionally to the proposed controller, the newly introduced capability for rotor-tilting, and thus thrust vectoring, as provided by this design is proposed for its utilization in the control of the longitudinal degree-of-freedom of the UAV. Simulation and experimental results are presented, demonstrating both the overall proposed controller's efficiency, as well as the clear advantage gained by the aforementioned proposed strategy, with regard to the controlled system's longitudinal control performance.

关键词： trajectory tracking Unmanned Aerial Vehicle drone honey bees Vertical take off Standing Orders cage set Linear quadratic Controllers UNMANNED vertical control performance Freedom Surgery

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A Context-aware model for QoE analysis in mobile environments 14

A Context-aware model for QoE analysis in mobile environment...

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XIV Congreso Internacional de Interaccion Persona-Ordenador, INTERACCION 2013 - 14th International Congress on Human-computer Interaction, INTERACCION 2013

作者： Mateo, Pedro Ruiz, Diego Sevilla Perez, Gregorio Martínez Catedra SAES Laboratories University of Murcia Ed. Rector Soler Murcia30.071 Spain Computer Engineering Dpt. University of Murcia Facultad de Informática Murcia30.071 Spain Comms. Engineering Dpt. University of Murcia Facultad de Informática Murcia30.071 Spain

ISBN: (纸本)9788469583524

This paper describes a novel approach to model users quality of experience (QoE) in mobile environments. A new model is presented to address the open questions of how to extract QoE from users interaction in mobile scenarios, and how to compare different QoE records to each other. This model establishes a set of parameters to dynamically describe the interaction between users and the system, the context in which it is performed and the quality perceived by the user. It provides a uniform representation of the interaction in mobile contexts, helping user-analysis applications to determine QoE and allowing the comparison between different QoE records. Its run-time nature also allows to make QoEbased decisions in real-time, enabling applications to adapt themselves and provide a better experience to users. As result, the proposed model provides unified criteria for the inference and analysis of QoE in mobile scenarios. © 2013 Actas del XIV Congreso Internacional de Interaccion Persona-Ordenador, INTERACCION 2013. All rights reserved.

关键词： Human computer interaction

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Automatic collection of failure data from the iOS platform

Automatic collection of failure data from the iOS platform

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2013 43rd Annual IEEE/IFIP Conference on Dependable Systems and Networks Workshop, DSN-W 2013

作者： Cinque, Marcello Cotroneo, Domenico Rodriguez-Dominguez, Carlos Garrido, Jose Luis Dpt. of Electrical Engineering and Information Technology DIETI University of Naples Federico II Via Claudio 21 80125 Naples Italy Dpt. of Computer Languages and Systems ETSIIT University of Granada C/ P. D. Saucedo Aranda S/N 18071 - Granada Spain

ISBN: (纸本)9781479901814

The increasing complexity of smart phones makes them more susceptible to accidental failures. However, there is still little understanding on the dependability behavior of modern smart phones. In this paper, we propose the design and implementation of a logger to collect relevant failure data from iOS devices, such as iPhone and iPad. The preliminary use of the logger on real-world devices shows that it is able to collect meaningful failure data and to provide interesting insight on the dependability behavior of iOS. © 2013 IEEE.

关键词： Smartphones

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