The security of critical infrastructures is decreasing due to the apparition of new cyber threats against Supervisory Control and Data Acquisition (SCADA) systems. The evolution they have experienced;the use of standa...
详细信息
ISBN:
(纸本)9783642196430
The security of critical infrastructures is decreasing due to the apparition of new cyber threats against Supervisory Control and Data Acquisition (SCADA) systems. The evolution they have experienced;the use of standard hardware and software components or the increase of interconnected devices in order to reduce costs and improve efficiency, have contributed to this. This work reviews the research effort done towards the development of anomaly detection for these specific systems. SCADA systems have a number of peculiarities that make anomaly detection perform better than in traditional information and communications technology (ICT) networks. SCADA communications are deterministic, and their operation model is often cyclical. Based on this premise, modeling normal behavior by mining specific features gets feasible.
In this paper we present an agent based system for extracting live and historic position data on multiple persons in a real environment, using a commercial off the shelves Real Time Location System (RTLS). We present ...
详细信息
ISBN:
(纸本)9783642198748
In this paper we present an agent based system for extracting live and historic position data on multiple persons in a real environment, using a commercial off the shelves Real Time Location System (RTLS). We present a context model for representing the location data which allows composition of location data with preexisting knowledge on the environment and activities taking place at the locations. We describe our experiences using the RTLS deployed in non-laboratory environment with hundreds of participants.
The current web integrates diverse sources of heterogeneous and distributed data (XML database, relational database, Peer database within a P2P network etc.). Integrating data from multiple heterogeneous sources leads...
详细信息
ISBN:
(数字)9783642180293
ISBN:
(纸本)9783642180286
The current web integrates diverse sources of heterogeneous and distributed data (XML database, relational database, Peer database within a P2P network etc.). Integrating data from multiple heterogeneous sources leads to the coexistence of different data models and consequently different query languages. Hence, there is a strong need to address the issue of handling queries over heterogeneous and distributed data. The structural and semantic heterogeneity of data makes the development of custom solutions for querying a time-consuming and complex task. In this paper we propose a query engine system, Virtual-Q. The system is based on data semantic categorization concept which assigns levels of importance according to the semantic level of the data sources. This approach is referred in our paper as the ontology-based approach. The Virtual-Q system aims at providing users a simple and transparent information access. This paper presents also a preliminary prototype validating the proposed architecture.
This paper presents the Juste-Neige system for predicting the snow height on the ski runs of a resort using a multi-agent simulation software. Its aim is to facilitate snow cover management in order to i) reduce the p...
详细信息
ISBN:
(纸本)9783642198748
This paper presents the Juste-Neige system for predicting the snow height on the ski runs of a resort using a multi-agent simulation software. Its aim is to facilitate snow cover management in order to i) reduce the production cost of artificial snow and to improve the profit margin for the companies managing the ski resorts;and ii) to reduce the water and energy consumption, and thus to reduce the environmental impact, by producing only the snow needed for a good skiing experience. The software provides maps with the predicted snow heights for up to 13 days. On these maps, the areas most exposed to snow erosion are highlighted. The software proceeds in three steps: i) interpolation of snow height measurements with a neural network;ii) local meteorological forecasts for every ski resort;iii) simulation of the impact caused by skiers using a multi-agent system. The software has been evaluated in the Swiss ski resort of Verbier and provides useful predictions.
Elderly people comprise the highest proportion of television viewers. However, they often struggle with new technologies and often out-rightly reject them due to their complexity. We propose a system to help people, e...
详细信息
ISBN:
(纸本)9783642231629
Elderly people comprise the highest proportion of television viewers. However, they often struggle with new technologies and often out-rightly reject them due to their complexity. We propose a system to help people, especially the elderly, keep up with new technologies, such as IPTV and social networks with reduced efforts. This system integrates IPTV and social networking website with an interface using mobile phone. Speech to text technology is used as input to reduce the difficulty involved in interaction while viewing television. As speech is a more convenient and natural way of expression than text, we anticipate that people in all age groups would benefit from the system.
With the advent of new technologies, an increasing amount of (scientific) conferences is being digitally recorded and archived for redistribution. Usually such conferences take the form of a series of talks where diff...
详细信息
ISBN:
(数字)9783642180293
ISBN:
(纸本)9783642180286
With the advent of new technologies, an increasing amount of (scientific) conferences is being digitally recorded and archived for redistribution. Usually such conferences take the form of a series of talks where different speakers make use of slide-based presentations displayed as a slide-show during the speech. The data within these electronic documents can be used to improve video indexing to facilitating hence the retrieval of specific sequences within a specific video. In order to exploit such data it is however necessary to synchronize the video with the corresponding slide-show presentation. So far such synchronization has been done mainly manually. Nowadays, given the large amount of conferences being recorded, manual archiving is becoming a too time-consuming task that need to be automated. This paper presents an algorithm that automatically segments the video of the presentation and aligns each segment to the corresponding slide. Multiple tests have been done to evaluate the performance of the proposed algorithm and the obtained results, presented in the paper, prove the effectiveness of the proposed algorithm.
Accurate modelling of driver behaviour in evacuations is vitally important in creating realistic training environments for disaster management. However, few current models have satisfactorily incorporated the variety ...
详细信息
ISBN:
(纸本)9783642198748
Accurate modelling of driver behaviour in evacuations is vitally important in creating realistic training environments for disaster management. However, few current models have satisfactorily incorporated the variety of factors that affect driver behaviour. In particular, the interdependence of driver behaviours is often seen in real-world evacuations, but is not represented in current state-of-the art traffic simulators. To address this shortcoming, we present an agent-based behaviour model based on the social forces model of crowds. Our model uses utility-based path trees to represent the forces which affect a driver's decisions. We demonstrate, by using a metric of route similarity, that our model is able to reproduce the real-life evacuation behaviour whereby drivers follow the routes taken by others. The model is compared to the two most commonly used route choice algorithms, that of quickest route and real-time re-routing, on three road networks: an artificial "ladder" network, and those of Lousiana, USA and Southampton, UK. When our route choice forces model is used our measure of route similarity increases by 21%-93%. Furthermore, a qualitative comparison demonstrates that the model can reproduce patterns of behaviour observed in the 2005 evacuation of the New Orleans area during Hurricane Katrina.
Sophisticated Technology Enhanced Learning (TEL) instruments as training simulations and Serious Games (SG) do not provide knowledge content in an explicit form, but propose interactive solutions for learners to build...
详细信息
ISBN:
(纸本)9783642231629
Sophisticated Technology Enhanced Learning (TEL) instruments as training simulations and Serious Games (SG) do not provide knowledge content in an explicit form, but propose interactive solutions for learners to build their own skills and competences in close to real situations. Thus, expert knowledge should be implicitly embedded into design of SG and training simulations. The present paper discusses the problem of expert knowledge elicitation for building SG, and provides an analysis of the use of cognitive task analysis methods for SG. The use of Applied Cognitive Task Analysis (ACTA) as effective and time-efficient tool for codification of complex expert skills in the context of serious games and complex simulations is discussed, on the base of experience gained in the TARGET project.
Availability and open access to resources is an important factor in educational development, but not a sufficient solution by itself. Open educational practices need to be fostered by an appropriate supportive environ...
详细信息
ISBN:
(纸本)9783642231629
Availability and open access to resources is an important factor in educational development, but not a sufficient solution by itself. Open educational practices need to be fostered by an appropriate supportive environment including discoverable and shareable content, combined with tools for adaptation and redistribution. Although a number of open content resources have been created, the accessibility for end users remains low because resources are spread across different OER repositories. This paper is an attempt to respond to OER challenges by proposing an innovative architecture extending the set of features typical for portal OER repositories with resource discoverability, social networking features and (re)publishing functionality.
暂无评论