Non-intrusive continuous user behaviour analysis using computerized systems

There are different ways to authenticate humans, which is an essential prerequisite for access control. The authentication process can be subdivided into three categories that rely on something someone i) knows (e.g. password), and/or ii) has (e.g. smart card), and/or iii) is (biometric features). Besides classical attacks on password solutions and the risk that identity-related objects can be stolen, traditional biometric solutions have their own disadvantages such as the requirement of expensive devices, risk of stolen bio-templates etc. Moreover, existing approaches provide the authentication process usually performed only once initially. Non-intrusive and continuous monitoring of user activities emerges as promising solution in hardening authentication process: iii-2) how so. behaves. In recent years various keystroke dynamic behavior-based approaches were published that are able to authenticate humans based on their typing behavior. The majority focuses on so-called static text approaches, where users are requested to type a previously defined text. Relatively few techniques are based on free text approaches that allow a transparent monitoring of user activities and provide continuous verification. Unfortunately only few solutions are deployable in application environments under realistic conditions. Unsolved problems are for instance scalability problems, high response times and error rates. The aim of this work is the development of behavioral-based verification solutions. Our main requirement is to deploy these solutions under realistic conditions within existing environments in order to enable a transparent and free text based continuous verification of active users with low error rates and response times.

A Fast Platform for Interactive E-Learning Systems

Modern e-learning systems represent a special type of web information systems. By definition, information systems are special computerized systems used to perform data operations by multiple users simultaneously. Each active user consumes an amount of hardware resources. A shortage of hardware resources can be caused by growing number of simultaneous users. Such situation can result in overall malfunctioning or slowed-down system. In order to avoid this problem, the underlying hardware system gets usually continuously upgraded. These upgrades, typically accompanied with various software updates, usually result in a temporarily increased amount of available resources. This work deals with the problem in a different way by proposing an implementation of a web e-learning system with a modified software architecture reducing resource usage of the server part to the bare minimum. In order to implement a full-scale e-learning system that could be used as a substitute to a conventional web e-learning system, a Rich Internet Application framework was used as basis. The technology allowed implementation of advanced interactivity features and provided an easy transfer of a substantial part of the application logic from server to clients. In combination with a special server application, the server part of the new system is able to run with a reasonable performance on a hardware with very limited computing resources.

Comparing architectural styles for distributed expert knowledge modules in intelligent tutoring systems

Intelligent Tutoring Systems (ITSs) are computerized systems for learning-by-doing. These systems provide students with immediate and customized feedback on learning tasks. An ITS typically consists of several modules that are connected to each other. This research focuses on the distribution of the ITS module that provides expert knowledge services. For the distribution of such an expert knowledge module we need to use an architectural style because this gives a standard interface, which increases the reusability and operability of the expert knowledge module. To provide expert knowledge modules in a distributed way we need to answer the research question: ‘How can we compare and evaluate REST, Web services and Plug-in architectural styles for the distribution of the expert knowledge module in an intelligent tutoring system?’. We present an assessment method for selecting an architectural style. Using the assessment method on three architectural styles, we selected the REST architectural style as the style that best supports the distribution of expert knowledge modules. With this assessment method we also analyzed the trade-offs that come with selecting REST. We present a prototype and architectural views based on REST to demonstrate that the assessment method correctly scores REST as an appropriate architectural style for the distribution of expert knowledge modules.

A generic framework and runtime environment for development and evaluation of behavioral biometrics solutions

Increasing use of computerized systems in our daily lives creates new adversarial opportunities for which complex mechanisms are exploited to mend the rapid development of new attacks. Behavioral Biometrics appear as one of the promising response to these attacks. But it is a relatively new research area, specific frameworks for evaluation and development of behavioral biometrics solutions could not be found yet. In this paper we present a conception of a generic framework and runtime environment which will enable researchers to develop, evaluate and compare their behavioral biometrics solutions with repeatable experiments under the same conditions with the same data.

Desenvolvimento de um programa computacional destinado à unidade móvel de ensaio na barra de tração (umeb) para a avaliação do desempenho de tratores

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Report on the production of trade statistics in the Caribbean region

Includes bibliography

Metodologia para inovação tecnológica através de sistema colaborativo de inclusão digital e certificação na agricultura familiar

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

A percepção dos bibliotecários quanto ao sistema de administração de bibliotecas Argo: um estudo de caso na Universidade Federal do Rio Grande

O presente trabalho possuiu como tema um estudo a respeito da percepção dos bibliotecários do Sistema de Bibliotecas (SIB) da Universidade Federal do Rio Grande (FURG) quanto ao Sistema de Administração de Bibliotecas (ARGO). Convém dizer que na atualidade falar dos sistemas informatizados é buscar caminhos para um suporte melhor a informação e ampliar o acesso para os usuários. Assim, o objetivo geral deste trabalho foi investigar a percepção dos bibliotecários quanto ao sistema de administração de bibliotecas ARGO. Sendo os objetivos específicos identificar os bibliotecários que atuam junto ao sistema; conhecer a opinião dos pesquisados sobre o sistema utilizado; refletir, a luz da literatura sobre os resultados da pesquisa; e apresentar a direção do SIB os resultados, de modo a colaborar com o Sistema. Foi utilizado como metodologia uma pesquisa exploratória, quali-quantitativa e também um estudo de caso. Entre os principais resultados se destaca que o sistema não possui os atributos necessários para um bom funcionamento. Nas considerações se observou que durante um tempo o ARGO atendeu as necessidades da instituição, mas devido ao grande crescimento da universidade e do volume de trabalho, ele deixou a desejar.

A contrastive analysis of non-native interlanguage english intonation systems and their implication in the organisation of information from a functional perspectiva : a study based on a computerized corpus of spanish learners of english

El contexto teórico y empírico de esta investigación sobre entonación, se enmarca dentro de la filosofía lingüística de la teoría sistémico-funcional. El modelo metodológico empleado se basa en la Lingüística de Corpus. La descripción de la adquisición y aprendizaje de la lengua extranjera está justificada dentro del marco teórico de la teoría de interlengua y la adquisición de segundas lenguas y lenguas extranjeras.. El presente estudio del corpus comparativo y longitudinal de aprendices y hablantes nativos de lengua inglesa, tiene como objetivo principal investigar los modelos de entonación producidos por ambos grupos de hablantes. Se pretende demostrar que la diferencia a nivel entonativo entre estos dos grupos no sólo tiene como resultado que los no nativos tengan acento extranjero; sino que puede afectar al mensaje transmitido, en cuanto a la estructura y organización de la información dentro del discurso oral en las metafunciones textual e interpersonal.. Se asume la existencia de un sistema entonativo de interlengua, de esta forma este análisis tiene como objeto no sólo reflejar los errores sino también los posibles sistemas aproximativos de los aprendices mencionados..