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International Conference on Communications (COMM)

作者： Adriana-Cristina Enache Victor Valeriu Patriciu Faculty of Automatic Control and Computer Science Politehnica University Bucharest Romania Military Technical Academy Computer Science Bucharest Romania

Web Spam, or Spamdexing, is a form of Search Engine Optimization(SEO) spamming that hinders the efficiency of search engines. These types of exploits use unethical methods in order to place a web page into the first rank. Sabotaging the quality of the results retrieved by search engines can lead users to mistrust the search engine provider. Moreover, spam websites can be a starting point for phishing or malware attacks. Over the last decade Web Spamming has become an important problem. This paper shows a spam host detection approach that uses swarm intelligence. We test our model on two datasets (WEBSPAM-UK2011 and WEBSPAM-UK2007) and show that it can obtain a good accuracy. Moreover, we compared our approach with other popular classifiers (C4.5, SVM and Logistic Regression ) and empirically demonstrated that it can outperform them in some cases.

关键词： Unsolicited electronic mail Particle swarm optimization Training Accuracy Support vector machines Data mining Feature extraction

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On the Set of Perron Exponents of Discrete Linear Systems

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IFAC Proceedings Volumes 2014年第3期47卷 11740-11742页

作者： Adam Czornik Jerzy Klamka Michał Niezabitowski Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Akademicka 16 St. 44-101 Gliwice

The Lyapunov, Bohl and Perron exponents belong to the most important numerical characteristics of dynamical systems used in control theory. Properties of the first two characteristics are well described in the literature. Properties of the Perron exponents are much less investigated. In this paper we show an example of two-dimensional discrete-time linear system with bounded coefficients for which the set of Perron exponents constitutes an interval.

关键词： Perron exponent stability time-varying systems Cantor-type set

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ONSIDE: Socially-aware and Interest-based dissemination in opportunistic networks

ONSIDE: Socially-aware and Interest-based dissemination in o...

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IEEE Symposium on Network Operations and Management

作者： Radu-Ioan Ciobanu Radu-Corneliu Marin Ciprian Dobre Valentin Cristea Constandinos X. Mavromoustakis Computer Science Department Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest Romania Department of Computer Science University of Nicosia Nicosia Cyprus

ISBN: (纸本)9781479909117

Data dissemination in opportunistic networks poses a series of challenges, since there is no central entity aware of all the nodes' subscriptions. Each individual node is only aware of its own interests and those of a node that it is contact with, if any. Thus, dissemination is generally performed using epidemic algorithms that flood the network, but they have the disadvantage that the network overhead and congestion are very high. In this paper, we propose ONSIDE, an algorithm that leverages a node's online social connections (i.e. friends on social networks such as Facebook or Google+), its interests and the history of contacts, in order to decrease congestion and required bandwidth, while not affecting the overall network's hit rate and the delivery latency. We present the results of testing our algorithm using an opportunistic network emulator and three mobility traces taken in different environments.

关键词： Social network services Algorithm design and analysis Measurement History Routing Bandwidth Mobile handsets

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Linearizing controller for higher-degree nonlinear processes with compensation for modeling inaccuracies practical validation and future developments

Linearizing controller for higher-degree nonlinear processes...

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International Conference on Informatics in control, Automation and Robotics (ICINCO)

作者： Pawel Nowak Jacek Czeczot Tomasz Klopot Mateusz Szymura Bogdan Gabrys Faculty of Automatic Control Electronics and Computer Science Institute of Automatic Control Gliwice Poland Smart Technologies Research Centre Bournemouth University Fern barrow Poole U.K.

This work shows the results of the practical implementation of the linearizing controller for the example laboratory pneumatic process of the third relative degree. controller design is based on the Lie algebra framework but in contrast to the previous attempts, the on-line model update method is suggested to ensure offset-free control. The paper details the proposed concept and reports the experiences from the practical implementation of the suggested controller. The superiority of the proposed approach over the conventional PI controller is demonstrated by experimental results. Based on the experiences and the validation results, the possibilities of the potential application of the data-driven soft sensors for further improvement of the control performance are discussed.

关键词： Process control Mathematical model Computational modeling Sensors Noise measurement Observers

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Semantic report search engine — Questor

Semantic report search engine — Questor

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Andrei Vasilateanu Nicolae Goga Alin Moldoveanu Faculty of Engineering in Foreign Languages University Politehnica of Bucharest Romania Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Romania

As ever more data is collected in the business processes of large enterprises, the decision makers need new business intelligence tools. Enterprise reporting tools have been available for some time, however, while reports aggregate business data, the large number of reports can become unmanageable. The European funded project Questor aims to create a revolutionary product that will eliminate the complexities inherent in the report management workflow. The final purpose is to make querying the report database as simple as addressing a question in natural language. This paper gives an overview over the concept of the Questor project, its software architecture, algorithms and results.

关键词： Ontologies Search engines Semantics Engines Crawlers Databases Resource description framework

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Automated measurement setup for microcontrollers and magnetic sensors

UPB Scientific Bulletin, Series C: Electrical Engineering

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UPB Scientific Bulletin, Series C: Electrical Engineering 2013年第1期75卷 91-100页

作者： Dochia, RǍzvan Bogdan, Daniela Burileanu, Corneliu Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Romania

În aceastǍ lucrare se vor prezenta rezultatele obt〉inute în urma dezvoltǍrii unor programe de automatizare a mǍsurǍtorilor. Acestea au fost folosite pentru demonstrarea tehnicilor legate de consumul de putere. Pentru validarea dar şi pentru demonstrarea versatilitǍt〉ii tehnicilor folosite vor fi prezentate si rezultatele obt〉inute în cazul mǍsuratorilor unui senzor magnetic pentru care se realizeazǍ şi o corelare cu rezultatele simulǍrilor. In this paper there will be presented the results obtained after the implementation of an automated measurement setup. These were used to prove the proposed methods of power consumption. To validate and to demonstrate the versatility of the techniques used, there will also be a presentation of the results obtained for measuring a magnetic sensor for which a correlation with the simulation results is also performed.

关键词： Microcontrollers

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Performance analysis of lustre file systems based on benchmarking for a cluster system

UPB Scientific Bulletin, Series C: Electrical Engineering

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UPB Scientific Bulletin, Series C: Electrical Engineering 2013年第1期75卷 27-36页

作者： Negru, CǍtǍlin Pop, Florin Dobre, Ciprian Cristea, Valentin Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Romania

În sistemele distribuite de mari dimensiuni o clasǍ importantǍ de aplicat〉ii este cea a aplicat〉iilor data-intensive (din mediile de cercetare şi de afaceri). Specificul acestor aplicat〉ii îl reprezintǍ cerint〉ele de I/O asupra sistemelor de fişiere. Sistemele de fişiere, în aceste condit〉ii pot produce o scǍdere a performant〉ei aplicat〉iilor. Arhitectura sistemelor distribuite are un rol important cu privire la scalabilitate şi performant〉Ǎ. Mediul de transmisie oferit de ret〉elele de comunicat〉ie este un factor cheie în proiectarea şi implementarea sistemelor de stocare. În acest articol este prezentatǍ analiza sistemelor de fişiere distribuite moderne (cu accent pe sistemul Lustre), prezentând argumentele pro şi contra cu privire la suportul operat〉iilor I/O în aplicat〉iile data-intensive. Sistemul Lustre este analizat pentru cluster-ul NCIT din cadrul UPB. Au fost rulate teste de benchmark folosind diferite scenarii de test pentru operat〉iile de citire şi scriere pentru determinarea şabloanelor optime, în vederea obt〉inerii unei performant〉e ridicate pentru aplicat〉ii. Many of today's applications in large scale distributed systems fall under the category of data-intensive processing (with many scientific or business cases). The specifics of data-intensive applications are the requirements of many I/O requests. In this case the I/O system becomes a major bottleneck for the overall performance of the application. The architecture of a distributed file system for support of such applications has an important role regarding scalability and performance. The network components are a key factor that has various impacts on the overall performance. In this paper we present an analysis of two modern distributed file systems (in particular for LUSTRE and NFS). We present their pros and cons arguments for I/O support in data-intensive applications. We determine the main characteristics of Lustre and its suitability to support complex scientific applications in a dedicated

关键词： Benchmarking

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An agent-oriented and service-oriented architecture in medicine

UPB Scientific Bulletin, Series C: Electrical Engineering

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UPB Scientific Bulletin, Series C: Electrical Engineering 2013年第1期75卷 3-16页

作者： Moldoveanu, Florica Cristescu, Sorin-Alexandru Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Romania

PânǍ de curând, sistemele informatice medicale erau proprietatea anumitor institut〉ii, lucru care a avut un impact negativ asupra calitǍt〉ii serviciilor medicale. OdatǍ cu introducerea standardului HL7 v3 s-au creat premizele abordǍrii problemei interoperabilitǍt〉ii. Din pǍcate, folosirea standardului HL7 este limitatǍ şi defectuos înt〉eleasǍ, în timp ce vechile aplicat〉ii încǍ dominǍ lumea medicalǍ. AceastǍ lucrare propune o arhitecturǍ bazatǍ pe sisteme multiagent şi web semantic care abordeazǍ problema interoperabilitǍt〉ii între sistemele din domeniul medical, având ca nucleu un motor de cǍutare semanticǍ pentru servicii web şi agent〉i software. Traditionally, medical information systems have been proprietary to certain institutions, with a negative impact on the quality of medical services. The introduction of the HL7 standard version 3, helps in defining a better approach to the issue of interoperability. However, the usage of the HL7 standard is limited and misunderstood, while the traditional proprietary applications still dominate the medical world. This paper proposes an architecture based on multiagent systems and semantic web that addresses the interoperability between medical information systems, having as kernel a semantic web service as a solution to the registration and discovery of web services and software agents.

关键词： Semantic Web

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Local Texton Dissimilarity with applications on biomass classification

Local Texton Dissimilarity with applications on biomass clas...

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International Conference on computer Vision Theory and Applications (VISAPP)

作者： Radu Tudor Ionescu Andreea-Lavinia Popescu Dan Popescu Marius Popescu Faculty of Mathematics and Computer Science University of Bucharest Bucharest Romania Faculty of Automatic Control and Computer Science Politehnica University of Bucharest 313 Splaiul Independentei Street Romania Faculty of Mathematics and Computer Science University of Bucharest 14 Academiei Street Romania

ISBN: (纸本)9781479976867

Texture classification, texture synthesis, or similar tasks are an active topic in computer vision and pattern recognition. This paper aims to present a novel texture dissimilarity measure based on textons, namely the Local Texton Dissimilarity (LTD), inspired from (Dinu et al., 2012). Textons are represented as a set of features extracted from image patches. The proposed dissimilarity measure shows its application on biomass type identification. A new data set of biomass texture images is provided by this work, which is available at http://***. Images are separated into three classes, each one representing a type of biomass. The biomass type identification and quality assessment is of great importance when one in the biomass industry needs to produce another energy product, such as biofuel, for example. Two more experiments are conducted on popular texture classification data sets, namely Brodatz and UIUCTex. The proposed method benefits from a faster computational time compared to (Dinu et al., 2012) and a better accuracy when used for texture classification. The performance level of the machine learning methods based on LTD is comparable to the state of the art methods.

关键词： Biomass Feature extraction Kernel Accuracy Learning systems Gray-scale Fractals

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Optimizing node response using real-time operating system in wireless sensors networks

UPB Scientific Bulletin, Series C: Electrical Engineering

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UPB Scientific Bulletin, Series C: Electrical Engineering 2013年第1期75卷 37-46页

作者： PopeangǍ, CǍtǍlin Ionescu, Gabriel Dobrescu, Radu Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Romania

Scopul principal al solut〉iei propuse pentru cercetare şi dezvoltare, într-o versiune experimentalǍ, este implementarea/portarea unor sisteme de operare în timp real OSE[1][2][3] (Operating System Embedded) pe hardware-ul specific unei arhitecturi tipice nodului din ret〉elele wireless de sensori. Acest studiu de caz va compara implementǍrile proprii ale sistemelor de operare OSE cu cele mai cunoscute sisteme de operare utilizate în ret〉elele de senzori. The main goal of the proposed solution for research and development, in an experimental version, is the implementation/porting of real-time operating systems OSE [1][2][3] (Operating System Embedded) on a hardware specific to a typical node architecture in WSNs (wireless sensor networks). This case study will compare our own OSE operating system implementations with the most popular operating systems used in WSNs.

关键词： Embedded systems

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