Destaques

Title: Semi-automatic Synchronization of Sensory Effects in Mulsemedia Authoring Tools

Author: Raphael Silva de Abreu

Abstract: Synchronization of sensory effects with multimedia content is a non- trivial and error-prone task that can discourage authoring of mulsemedia applications. Although there are authoring tools that assist in the specification of sensory effect metadata in an automated way, the forms of analysis used by them are not general enough to identify complex components that may be related to sensory effects. In this work, we present an intelligent component, which allows the semi-automatic definition of sensory effects. This component uses a neural network to extract information from video scenes. This information is used to define sensory effects synchronously to related videos. The proposed component was implemented in STEVE~2.0 authoring tool, helping the authoring of sensory effects in a graphical interface.

Title: Automatic Preparation of Media Objects in Multimedia Applications

Author: Marina Ivanov

Abstract: In multimedia applications, spatiotemporal relationships among media

objects should be controlled during the execution phase in order to preserve the quality of presentation. When the content that composes the application is delivered over a communication network, some delays may occur due to network congestion problems. In order to avoid synchronization faults during the presentation of the distributed multimedia applications, this work proposes the automatic preparation of media objects. The automatic preparation of media objects aim to ensure that all media objects are available in the receiver device at their presentation moment. In our proposal, the multimedia presentation engine (formatter) builds a preparation plan based on the network conditions and the presentation behavior learned from the multimedia document that defines the application. As proof of concept, we implemented the automatic creation of the preparation plan in the Ginga-NCL middleware. Furthermore, a use case is presented to demonstrate the automatic preparation for NCL applications. Finally, a brief discussion about garbage collection in multimedia applications containing non-deterministic events is also presented.

Title: V-PRISM: An edge-based architecture to virtualize multimedia sensors in the Internet of Things

Author: Anselmo Luiz Eden Battisti

Abstract: The Internet of Things (IoT) enables the interconnection with the Internet of the most varied physical objects, instrumented by intelligent sensors and actuators. By addressing physical objects and making them part of a global network, the IoT has the potential to provide novel applications to make life easier and healthier for citizens, to increase the productivity of companies and to promote the building of more intelligent and sustainable cities, environments and countries. Several types of sensors compose the IoT ecosystem. Among them, multimedia sensors have recently become a major source of data, giving raise to the Internet of Multimedia Things. With the wide spread of the Internet of Things, and its integration with Cloud platforms, a novel paradigm called Cloud of Things (CoT) has recently emerged. In this context, the cloud works as an intermediary between the sensors/IoT devices and applications. CoT system is strongly based on the concept of virtualization, to help dealing with the complexity raised by the heterogeneity of the sensors. However, multimedia applications usually are latency-sensitive, therefore the data processing in the remote cloud is not always effective. A strategy to minimize the latency is to process the multimedia stream closer to the data sources, exploiting the resources at the edge of the networks. Therefore, in this paper, we propose V-PRISM, an architecture to virtualize multimedia sensors with components deployed and executed at the edge tier of a Cloud of Things ecosystem. The adoption of V-PRISM can reduce the battery and CPU consumption at the IoT devices, reduce the traffic at the IoT network, decrease the end-to-end latency and increase the ROI for infrastructure providers.

Prof. George Ghinea
Brunel University

Title: Mulsemedia in 360 VR

Abstract: Previous research has shown that adding multisensory media---mulsemedia---to traditional audiovisual content has a positive effect on user Quality of Experience (QoE). However, the QoE impact of employing mulsemedia in 360 videos has remained unexplored. Accordingly, in this talk, Prof. Ghinea is going to present results of a recently concluded QoE study for watching 360 videos---with and without multisensory effects---in a full free-viewpoint Virtual Reality.

Short Bio: Dr. Gheorghita (George) Ghinea is a Professor in Mulsemedia Computing in the Department of Computer Science, at Brunel University. Dr. Ghinea's research activities lie at the confluence of Computer Science, Media and Psychology. In particular, his work focuses on the area of perceptual multimedia quality and how one builds end-to-end communication systems incorporating user perceptual requirements. To this end, recognising the infotainment duality of multimedia, Dr. Ghinea proposed the Quality of Perception metric as a more complete characterisation of the human side of the multimedia perceptual experience. Dr. Ghinea has applied his expertise in areas such as eye-tracking,telemedicine, multi-modal interaction, and ubiquitous and mobile computing, leading a team of 8 researchers in these areas. He has over 300 publications in his research field and is the lead Brunel investigator of a H2020 project NEWTON (http://www.newtonproject.eu/) applying mulsemedia to STEM learning across Europe.

Title: A Counselors-Based Intrusion Detection Architecture

Author: Silvio Ereno Quincozes

Abstract: Intrusion Detection Systems (IDSs) are a fundamental component of defensive solutions. In particular, signature-based IDSs aim to detect malicious activities on computer systems and networks by relying on data classification models built from a training dataset. However, classifiers performance can vary for each attack pattern. A common technique to overcome this issue is to use ensemble methods, where multiple classifiers are employed and a final decision is taken combining their outputs. Despite the potential advantages of such an approach, its usefulness is limited in scenarios where (i) multiple expert classifiers present divergent results or (ii) representative data are missing to detect a specific attack class. In this work, we introduce the concept of counselor networks to deal with conflicts from different classifiers by exploiting the collaboration between IDSs that analyze multiple and heterogeneous data sources. Our empirical results demonstrate the feasibility of the proposed architecture in improving the accuracy of the intrusion detection process.

Title: A Cache Prefetch Policy based on Users’ Temporal-and-Social Behavior for Content Management in Wireless Access Networks

Author: Cleomar Márcio Marques de Oliveira

Abstract: In this article, a new policy is proposed for store and drops cache content in the Wireless Access Networks nodes. The proposed policy select content that can be dropped and new content to be cached in a network node, on predefined time periods at each day and with pre-established time duration each one, repeated at each day. The temporal aspects and users social behavior that connect to the node for decision making are considered. An algorithm selects new content, in the same proportion, from those categories historically requested ones in these time periods on previous day. These new content selection purpose is to cache them in current day, at the corresponding time periods, to increase the content request hit ratio according to this policy. Simulation results against established FIFO, LRU, LFU and RANDOM policies show that this proposed policy hit ratio is 2.46 times higher than the others, with an average hit ratio of 13.1% here versus an average hit ratio 5.325% of the above cited policies, in the evaluated scenarios.

Title: Using ubus for collecting data and remote configuration of OpenWRT Access Points

Author: Yago de Rezende dos Santos

Abstract: As SCIFI progressed, different protocols were used for collecting data from and configuring Access Points. Originally ssh and scp were used for increased security on an open network. When the control network was isolated on it's own vlan, data collection and configuration migrated to snmp. Finally, the new design calls for rpc using the ubus infrastructure.

Title: Natural Language Processing Characterization of Recurring Calls in Public Security Services

Author: Nicollas Rodrigues De Oliveira

Abstract: Extracting knowledge from unstructured data silos, a legacy of old applications, is mandatory for improving the governance of today's cities and fostering the creation of smart cities. Texts in natural language often compose such data. Nevertheless, the inference of useful information from a linguistic-computational analysis of natural language data is an open challenge. In this paper, we propose a clustering method to analyze textual data employing the unsupervised machine learning algorithms k-means and hierarchical clustering. We assess different vector representation methods for text, similarity metrics, and the number of clusters that best matches the data. We evaluate the methods using a real database of a public record service of security occurrences. The results show that the k-means algorithm using Euclidean distance extracts non-trivial knowledge, reaching up to 93% accuracy in a set of test samples while identifying the 12 most prevalent occurrence patterns.

Title: An SDN-based access point virtualization solution for multichannel IEEE 802.11 networks

Author: Juan Lucas do Rosário Vieira

Abstract: As we move into increasingly denser Wi-Fi scenarios with a more significant number of connected objects, problems such as load unbalance and collisions between transmissions become more severe. While client-based handoff is inefficient to mitigate these challenges, network-wide migration decisions would allow better management of network resources. This work proposes an access point virtualization solution based on the SDN paradigm to allow client handover conducted by the network, based on a global scope. The evaluation of our solution reveals that the handover of stations did not lead to significant delays or packet losses in the clients' connections while providing greater flexibility to the management of IEEE 802.11 wireless networks.

Title: 3AS: Authentication, Authorization, and Accountability for Smart Grids

Author: Arthur Albuquerque Zopellaro Soares

Abstract: The smart grid arises from the need to improve the traditional grid, enabling, among other features, the monitoring and control of the grid with the aid of communication networks and information technology. Despite the benefits presented by the introduction of a communication network, this network also incorporates new vulnerabilities into the smart grid. This work proposes 3AS: Authentication, Authorization, and Accounting for Smart Grids. This proposal provides an IEEE 802.1X-based authentication mechanism for the communication protocols specified by IEC 61850, proposes the use of attribute-based access control, and proposes an integrated accounting system by logging resources usage, authentication, and authorization events. Other works found in the literature only address specific smart grid scenarios, while 3AS is concerned with meeting diverse smart grid scenarios, such as the introduction of electric vehicles to the grid, and teleprotection systems for the grid. Emulated experiments show that the authentication mechanism produces a control load of 4.65 kB, 48.84% less than the mechanism proposed by another work. Authentication has also been validated through two different authentication models: EAP-PEAP, for the electric vehicle scenarios, and produces less control overhead; and EAP-TLS, for teleprotection scenarios, showing less delay. The authorization process was shown efficient by blocking communication from unauthenticated or unauthorized devices and allowing communication only after successful authorization.

Title: MineCap: Super Incremental Learning for Detecting and Blocking Cryptocurrency Mining on Software-Defined Networking

Author: Hélio do Nascimento Cunha Neto

Abstract: Covert mining of cryptocurrency implies the use of valuable computing resources and high energy consumption. In this paper, we propose MineCap, a dynamic online mechanism for detecting and blocking covert cryptocurrency mining flows, using machine learning on software-defined networking. The proposed mechanism relies on Spark Streaming for online processing of network flows, and, when identifying a mining flow, it requests the flow blocking to the network controller. We also propose a learning technique called super incremental learning, a variant of the super learner applied to online learning, which takes the classification probabilities of an ensemble of classifiers as features for an incremental learning classifier. Hence, we design an accurate mechanism to classify mining flows that learn with incoming data with an average of 98% accuracy, 99% precision, 97% sensitivity, and 99.9% specificity and avoid concept drift-related issues.