Dimitrios Kallergis

Transport services within the IoT ecosystem using localisation parameters

Within the Internet of Things (IoT) ecosystem, there is a need to interconnect networks of sensors and smart objects in a way that they can intelligently interact with humans. In most cases, these networks have been implemented following the machine-to-machine (M2M) communication disciplines. To adequately design such an emerging system which also has legacy technology characteristics, it is crucial to adopt an architecture reference model. In the context of this work, an architecture and characteristics assessment is conducted to form a roadmap of evolution from an M2M solution to an IoT in the field of Autonomous Vehicles (AVs). Then, an architecture for an AV prototype within the IoT ecosystem is proposed; the intelligent Bus on Campus (iBuC). The respective services are illustrated through a customised real-life scenario.

A policy-aware Service Oriented Architecture for secure machine-to-machine communications

Abstract Breakthrough recent advancements in the field of machine-to-machine (M2M) communications impose the necessity to improve the service delivery by enforcing appropriate security rules. Due to the large number of the connected devices, the criticality of the M2M applications (e.g. patient monitoring and operation of critical infrastructures), and the network stability weaknesses, we need to consider and analyse the security aspects and establish a flexible policy-aware Service Oriented Architecture (SOA) competent to deal with these emerging challenges. This paper presents the existing reference models and proposes a novel Secure M2M Architecture (SeMMA) based on ETSIs M2M communication functional architecture enhanced with policy-based management capabilities and SOA capabilities. We explore the policy-based management aspects to improve the security of the M2M components and services and to mitigate the security concerns that arise by evaluating different scenarios. It is shown that incorporating an adaptive policy enforcement of the suitable security controls enables enhanced security capabilities, increased agility, and better service levels in the field of M2M communications.

Towards mobile cloud security performance: A cross-border approach

The concept of security performance emerges as the core attribute when cloud-based systems need to process data flows through different countries. To effectively address the cloud security issues through a territorial perspective, it is crucial to focus on the initial objectives of the Terms of Service as issued by the cloud service operator or provider. In this paper, a cloud-based service scenario where sensitive data are transferred and managed in a cross-border manner is assessed. The threats definition process considers the adoption of mobile devices. The paper focuses on the security assessment process and on information reconnaissance which in turn leads to the cloud defence boundarys exploitation. Also, the issue of how the service level objectives (SLOs) may affect security and privacy issues in a cloud-based environment is addressed.

Performance evaluation of cloud systems: A behavioural approach

The concept of Cloud Engineering (CE) as a superset of performance engineering emerges in an extensive number of industrial architectural approaches and implementation flavours. To effectively manage cloud-based systems, it is crucial to monitor, to meter and then to allocate their structural behaviour and performance. In the context of this work, considerable number of experimental measurements are conducted in a distributed virtualised infrastructure and statistically analysed. The paper aims to evaluate cloud systems using multiple open-source benchmarking tools. Also, it addresses and discusses operational deviations of a commercial cloud system in respect to the service level objects (SLOs) per se.

Earth and groundwater visualisation using 3D modelling techniques in a cloud computing environment

This paper presents a process for modelling and visualizing Earth and groundwater in Greece using a highly customised open-source part of a 3D engine. Intelligent computational geometry methods are being used to fabricate the visualization in the three-dimensional space. Each step of the process is acknowledged as a subsystem and is illustrated and thoroughly discussed. Geospatial data regarding boreholes, pipelines and aquifers are hosted in a relational database system. The developed subsystems form a state-of-the-art application that is deployed in a cloud computing infrastructure with inherited elastic and resilient features for further development.

Pirus: A file storage service in cloud computing for educational use

This paper describes a file storage service for elearning platforms using object oriented logic in a cloud computing environment. The service can be used by an academic community giving users the ability to store remotely and access their personal files with no security compromises. The Learning Research Management (LRM) innovative system is introduced and a technological assessment of this system is proposed and implemented using a statistical evaluation process. The conducted process is based on the perceptions from using the system by the involved student population. This process leads to an iterative decision making phase to further improve the system.