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SDN aims to facilitate the management of increasingly complex, dynamic network environments and optimize the use of the resources available therein with minimal operator intervention. To this end, SDN controllers maintain a global view of the network topology and its state. However, the extraction of information about network flows and other network metrics remains a non-trivial challenge. Network...
The recent enhancement of sensor devices, such as the Micro-Electro Mechanical Devices (MEMs) used for information collection and dissemination, has led to the emergence of the Internet of Things (IoT). This new paradigm overlaps with many research area such as the Wireless Sensor Networks (WSNs) where sensor nodes are deployed over an area to perform local computations based on information gathered...
This work studies centrality metrics as forwarding load predictors, for both unicast and multicast traffic, within dynamic ad hoc network topologies. We present results from a series of emulation experiments based around an emergency response mobile network scenario. From collected temporal topological and traffic data, we calculate a rank correlation measure between predictive centrality metrics...
Quality of service and quality of experience are of increasingly interest for successful communication network applications, particularly for decentralized networks, such as peer-to-peer (p2p) networks. They need sophisticated monitoring mechanisms to be able to adapt the system's parameters to maintain a certain level of quality of service. In the literature, several well-studied approaches, classified...
In a wireless ad hoc multimedia network, how does the Quality of Experience (QoE) of the user affect the level of Situational Awareness (SA)? Is maximum QoE necessary for high SA? In this empirical study, we propose a novel measurement approach to quantify SA based on the QoE of the user. The relationship between QoE and network Quality of Service (QoS) metrics such as delay and packet loss is well...
System monitoring is an established tool to measure the utilization and health of HPC systems. Usually system monitoring infrastructures make no connection to job information and do not utilize hardware performance monitoring (HPM) data. To increase the efficient use of HPC systems automatic and continuous performance monitoring of jobs is an essential component. It can help to identify pathological...
Middleboxes in private networks have been known to change packets in many ways, making it hard to design protocol extensions that work for the large majority of Internet users. Addressing the need to know what such middleboxes do, we introduce a tool called fling ("flexible ping"). fling can carry out (almost) any kind of protocol dialogue between a server and a client based on a simple...
We investigate a formal characterisation of interactional justice asa mechanism for self-organisation of institutional rules in an open system, in order to address issues of congruence, acceptability and risk. The process of interactional justice uses opinion formation over a social network with respect to a shared set of congruent values, to transform a set of individual, subjective self-assessments...
A novel approach of a test environment for embedded networking nodes has been conceptualized and implemented. Its basis is the use of virtual nodes in a PC environment, where each node executes the original embedded code. Different nodes run in parallel, connected via so-called virtual channels. The environment allows to modifying the behavior of the virtual channels as well as the overall topology...
Previous models based on Deep Convolutional Neural Networks (DCNN) for face verification focused on learning face representations. The face features extracted from the models are applied to additional metric learning to improve a verification accuracy. The models extract high-dimensional face features to solve a multi-class classification. This results in a dependency of a model on specific training...
The concept of agile domain name system (DNS) refers to dynamic and rapidly changing mappings between domain names and their Internet protocol (IP) addresses. This empirical paper evaluates the bias from this kind of agility for DNS-based graph theoretical data mining applications. By building on two conventional metrics for observing malicious DNS agility, the agility bias is observed by comparing...
This publication presents a novel concept for securing P2P-based M2M applications using the integration of a trust management system. In addition, this publication presents different security problems inside the P2P-based M2M application (P2P4M2M) framework and evaluates P2P protocols based on security. Furthermore, this paper emphasises the importance of trust for ensuring security. This is done...
Approximate computing is gaining increasing interest among the VLSI design community due to its potential for enabling low power, high speed, and less area while delivering acceptably correct computation results for many digital signal processing applications. In this context, this paper considers for the first time asynchronous quasi-delay-insensitive (QDI) realizations of approximate adders which...
The rapid advances of transportation infrastructure have led to a dramatic increase in the demand for smart systems capable of monitoring traffic and street safety. Fundamental to these applications are a community-based evaluation platform and benchmark for object detection and multi-object tracking. To this end, we organize the AVSS2017 Challenge on Advanced Traffic Monitoring, in conjunction with...
In order to achieve the requirement that the rotating speed of a rotor can be automatically controlled and measured by computer, a new control and measurement scheme based on computer technique is investigated in this paper. The scheme uses an inverter to control the electric motor. And meanwhile, a data acquisition system is used to sample the impulse signal to compute the rotating speed of the rotor...
Overlay multicast is regarded as a promising way for distributing file or live stream during recent years. In this paper, we reinforce an optimal DAGs (directed acyclic graphs) construction algorithm by relaxing its partitioning and sorting conditions. We employ a realistic topology (CERNET2 backbone) to evaluate several typical types of optimal DAGs in terms of the underlay performance metrics. Simulation...
In the last years, networking scenarios have been evolving, hand-in-hand with new and varied applications with heterogeneous Quality of Service (QoS) requirements. These requirements must be efficiently and effectively delivered. Given its static layered structure and almost complete lack of built-in QoS support, the current TCP/IP-based Internet hinders such an evolution. In contrast, the clean-slate...
Software-Defined Networking (SDN) is an innovative approach to provisioning and delivering QoS (Quality of Service) services, yet it is still devoid of context-differentiating services. In this paper we propose a network application (Autonomic QoS Broker) and a controller module that implements the OpenVSwitch Database Management Protocol (OVSDB). These two components were implemented and validated...
The current design drivers for multi-cores, namely performance per watt, scalability and flexibility, make the Networks-on-Chip (NoCs) the de-facto on-chip interconnect. State of the art NoCs can exploit heterogeneous solutions and complex DVFS techniques to fulfill also the variability of the application requirements. Relevant showstoppers to the design of a truly flexible NoC fitting all the possible...
Neither provider nor user are willing to use Web services (WSs) technologies in sensitive domains without some measure of security. The users, on one hand, want to guard their personal information against unauthorized parties. While, the providers, on the other hand, wish to hide their trade secrets and internal know-how. In our previous works, we suggested the use of the Symbolic Observation Graph...
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