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18th Panhellenic Conference on Informatics, PCI 2014

作者： Latsiou, Aikaterina Rizomili, Panagiotis Dep. of Information and Communication Systems Engineering University of Aegean Karlovassi Samos83200 Greece

ISBN: (纸本)1595930361

Cloud Computing (CC) is the new trend in computing and resource management, an architectural shift towards thin clients and conveniently centralized provision of computing and networking resources. Worldwide cloud services revenue reached 148.8 billion in 2014. However, CC introduces security risks that the clients of the cloud have to deal with. More precisely, there are many security concerns related to outsourcing storage and computation to the cloud and these are mainly attributed to the fact that the clients do not have direct control over the systems that process their data. In this paper, we investigate the new challenges that cryptography faces in the CC era. We introduce a security framework for analysing these challenges, and we describe the cryptographic techniques that have been proposed until now. Finally, we provide a list of open problems and we propose new directions for research. © 2014 ACM.

关键词： Outsourcing

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Indirect solution for optimal control problems with a pure state constraint

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IFAC Proceedings Volumes 2014年第3期47卷 2456-2461页

作者： Thijs van Keulen Eindhoven University of Technology Dep. of Mechanical Engineering Control Systems Technology group

This paper presents an algorithm that provides a regularization for the costate dynamics of state constrained optimal control problems with a scalar constraint under the assumption that the Hamiltonian is convex in the control and the state dynamics equation of the constrained state is monotonically increasing in the control variable. The algorithm is demonstrated with a classical optimal control problem.

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Accuracy Aspects in Motion Feedforward Tuning

Accuracy Aspects in Motion Feedforward Tuning

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American control Conference

作者： Frank Boeren Tom Oomen Maarten Steinbuch Eindhoven University of Technology Dep. of Mechanical Engineering Control Systems Technology Group Eindhoven The Netherlands

ISBN: (纸本)9781479932757

Feedforward control can significantly improve the performance of a motion system through compensation of known disturbances. Recently, new feedforward algorithms have been proposed that exploit measured data from previous tasks and a suitable feedforward parametrization to attain high performance. The aim of this paper is to analyze the accuracy of these approaches. To achieve this, related results from closed-loop identification are exploited in feedforward control. Furthermore, a new algorithm is proposed that leads to optimal accuracy. The results are confirmed in a simulation study of a motion system.

关键词： FEEDFORWARD FEEDFORWARD control tuning compensated

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A unified race algorithm for offline parameter tuning 14

A unified race algorithm for offline parameter tuning

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Simulation Winter Conference

作者： Tim van Dijk Martijn Mes Marco Schutten Joaquim Gromicho Dep. Industrial Engineering and Business Information Systems University of Twente Enschede THE NETHERLANDS Dep. Algorithmic Innovation ORTEC Software Development Zoetermeer THE NETHERLANDS

This paper proposes uRace, a unified race algorithm for efficient offline parameter tuning of deterministic algorithms. We build on the similarity between a stochastic simulation environment and offline tuning of deterministic algorithms, where the stochastic element in the latter is the unknown problem instance given to the algorithm. Inspired by techniques from the simulation optimization literature, uRace enforces fair comparisons among parameter configurations by evaluating their performance on the same training instances. It relies on rapid statistical elimination of inferior parameter configurations and an increasingly localized search of the parameter space to quickly identify good parameter settings. We empirically evaluate uRace by applying it to a parameterized algorithmic framework for loading problems at ORTEC, a global provider of software solutions for complex decision-making problems, and obtain competitive results on a set of practical problem instances from one of the world's largest multinationals in consumer packaged goods.

关键词： Tuning Training Software algorithms Loading Optimization Containers Software

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A quantitative method for graphical representation of H.264 video content dynamics

A quantitative method for graphical representation of H.264 ...

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International Conference on Telecommunications and Multimedia (TEMU)

作者： Michail-Alexandros Kourtis Harilaos Koumaras Charalampos Skianis Fotios Lazarakis Dep. of Information & Com. Systems Engineering University of the Aegean Greece Institute of Informatics and Telecommunications National Centre of Scientific Research “Demokritos” Athens Greece

This paper presents a method for graphical representation of H.264 video content dynamics, based on the extraction of motion information from the video signal in order to define the content's spatiotemporal dynamics levels. For this purpose, the paper introduces a motion compensation and content residual grid, where each video signal is represented as a point with coordinates that are defined by its motion dynamics and content residual, respectively. The proposed method can be effectively integrated as part of the decision process in video adaptation systems, which perform spatial or temporal (or both) adaptation actions, like MPEG-DASH, in order to optimize the video service delivery.

关键词： Vectors Motion compensation Streaming media Dynamics Measurement Indexes Spatiotemporal phenomena

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What Do Doctors Need for Effective Adoption and Integration of Clinical Guidelines into Daily Practice?

What Do Doctors Need for Effective Adoption and Integration ...

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IEEE International Conference on Healthcare Informatics (ICHI)

作者： Manuel Campos Beatriz García José M. Juárez Juan M. Guillamón Francisco Palacios Dep. Informatics and Systems. Faculty of Computer Science. University of Murcia Murcia Spain Dep. Information and Communication Engineering. University of Murcia Murcia Spain Intensive Care Unit. University Hospital of Getafe. Madrid Spain

Catheter-related bloodstream infection (CRBSI) is one of the major existing problems in Intensive Care Units (ICU). CRBSI has a high prevalence and its treatment is quite costly in time and medication. One of the essential efforts in the diagnosis and treatment of CRBSI is the use of existing Clinical Guidelines (CG). Nevertheless, its adoption and integration into daily practice is quite complex due to the lack of software tools that cover all the needs. Considering this problem, in this work we identify some of the needs detected in daily work, and we present two tools for ICUs that makes the introduction of CGs and patient's data visualization simple. As a first goal we propose to obtain a computerized model of the clinical guideline. Gewel is an application that allows the mapping of a textual CG into a workflow model. In this tool we propose a process that (1) organizes the parts of the textual document according to GEM, (2) maps concepts to the Electronic Health Record (EHR) system, called CH4, so that it can automatically retrieve data and send HL7 messages, (3) supports the design of a workflow model that assists the following up of the steps and the measure of adherence to the CG, and (4) according to Evidence Based Medicine principles, allows the doctors to trace from the task or decision point of the workflow to the exact part of the document where it was originated. Once the CG is computerized and integrated in the EHR, the next goal is to identify key clinical problems, such as CRBSI, and retrieve the relevant information from the EHR. Due to the big amount of the EHR data registered in an ICU, physician's attention should be drawn to the clinical information related to the problem to be solved. We propose a mobile application, called mProblem View, that permits to establish and visualize relations between the elements of the EHR in a Problem-Oriented EHR approach.

关键词： Medical services Medical diagnostic imaging Guidelines Standards Computational modeling XML Mobile communication

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Revisiting lightweight authentication protocols based on hard learning problems 13

Revisiting lightweight authentication protocols based on har...

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6th ACM Conference on Security and Privacy in Wireless and Mobile Networks, WiSec 2013

作者： Rizomiliotis, Panagiotis Gritzalis, Stefanos Dep. of Information and Communication Systems Engineering University of the Aegean Karlovassi Samos GR 83200 Greece

ISBN: (纸本)9781450319980

At the 2011 Eurocrypt, Kiltz et al., in their best paper price awarded paper, proposed an ultra-lightweight authentication protocol, called AUTH. This new protocol is supported by a delegated security proof, against passive and active attacks, based on the conjectured hardness of the Learning Parity with Noise (LPN) problem. However, AUTH has two shortcomings. The security proof does not include man-in-the-middle (MIM) attacks and the communication complexity is high. The weakness against MIM attacks was recently verified as a very efficient key recovery MIM attack was introduced with only linear complexity with respect to the length of the secret key. Regarding the communication overhead, Kiltz et al. proposed a modified version of AUTH where the communication complexity is reduced at the expense of higher storage complexity. This modified protocol was shown to be at least as secure as AUTH. In this paper, we revisit the security of AUTH and we show, somehow surprisingly, that its communication efficient version is secure against the powerful MIM attacks. This issue was left as an open problem by Kiltz et al. We provide a security proof that is based on the hardness of the LPN problem to support our security analysis. Copyright 2013 ACM.

关键词： Hardness

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Distinguishing the popularity between topics: A system for up-to-date opinion retrieval and mining in the web

Distinguishing the popularity between topics: A system for u...

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14th Annual Conference on Intelligent Text Processing and Computational Linguistics, CICLing 2013

作者： Pappas, Nikolaos Katsimpras, Georgios Stamatatos, Efstathios Idiap Research Institute Rue Marconi 19 1920 Martigny Switzerland University of the Aegean Dep. of Information and Communication Systems Engineering Karlovassi 83200 Samos Greece

ISBN: (纸本)9783642372551

The constantly increasing amount of opinionated texts found in the Web had a significant impact in the development of sentiment analysis. So far, the majority of the comparative studies in this field focus on analyzing fixed (offline) collections from certain domains, genres, or topics. In this paper, we present an online system for opinion mining and retrieval that is able to discover up-to-date web pages on given topics using focused crawling agents, extract opinionated textual parts from web pages, and estimate their polarity using opinion mining agents. The evaluation of the system on real-world case studies, demonstrates that is appropriate for opinion comparison between topics, since it provides useful indications on the popularity based on a relatively small amount of web pages. Moreover, it can produce genre-aware results of opinion retrieval, a valuable option for decision-makers. © 2013 Springer-Verlag.

关键词： Sentiment analysis

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GHB#: A provably secure HB-like lightweight authentication protocol

GHB#: A provably secure HB-like lightweight authentication p...

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10th International Conference on Applied Cryptography and Network Security, ACNS 2012

作者： Rizomiliotis, Panagiotis Gritzalis, Stefanos Dep. of Information and Communication Systems Engineering University of the Aegean Karlovassi Samos GR 83200 Greece

ISBN: (纸本)9783642312830

RFID technology constitutes a fundamental part of what is known as the Internet of Things;i.e. accessible and interconnected machines and everyday objects that form a dynamic and complex environment. In order to secure RFID tags in a cost-efficient manner, the last few years several lightweight cryptography-based tag management protocols have been proposed. One of the most promising proposals is the HB+ protocol, a lightweight authentication protocol that is supported by an elegant security proof against all passive and a subclass of active attackers based on the hardness of the Learning Parity with Noise (LPN) problem. However, the HB+ was shown to be weak against active man-in-the-middle (MIM) attacks and for that several variants have been proposed. Yet, the vast majority of them has been broken. In this paper, we introduce a new variant of the HB+ protocol that can provably resist MIM attacks. More precisely, we improve the security of another recently proposed variant, the HB# protocol by taking advantage of the properties of the well studied Gold power functions. The new authentication protocol is called GHB# and its security can be reduced to the LPN problem. Finally, we show that the GHB# remains practical and lightweight. © 2012 Springer-Verlag.

关键词： Authentication

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Evolutionary symbiotic feature selection for email spam detection

Evolutionary symbiotic feature selection for email spam dete...

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9th International Conference on Informatics in control, Automation and Robotics, ICINCO 2012

作者： Cortez, Paulo Vaz, Rui Rocha, Miguel Rio, Miguel Sousa, Pedro Dep. Information Systems Centro Algoritmi Universidade do Minho Guimarães Portugal Dep. Information Systems Universidade do Minho Guimarães Portugal Dep. of Informatics CCTC Universidade do Minho Braga Portugal Dep. Electric and Electronic Engineering University College London Torrington Place London United Kingdom Dep. of Informatics Centro Algoritmi Universidade do Minho Braga Portugal

ISBN: (纸本)9789898565211

This work presents a symbiotic filtering approach enabling the exchange of relevant word features among different users in order to improve local anti-spam filters. The local spam filtering is based on a Content- Based Filtering strategy, where word frequencies are fed into a Naive Bayes learner. Several Evolutionary Algorithms are explored for feature selection, including the proposed symbiotic exchange of the most relevant features among different users. The experiments were conducted using a novel corpus based on the well known Enron datasets mixed with recent spam. The obtained results show that the symbiotic approach is competitive. Copyright © 2012 SciTePress.

关键词： Evolutionary algorithms

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