Vol 2, No 1 (2017)

Table of Contents


1175 Views, 168 PDF Downloads
Fotis Aisopos, Antonios Litke, Magdalini Kardara, Konstantinos Tserpes, Pablo Martínez Campo, Theodora Varvarigou


In this paper we present the RADICAL platform, a software stack that enables the combination of social network (SN) services and Internet of Things (IoT) in the context of innovative smart cities. RADICAL makes possible the development and deployment of interoperable pervasive multi-sensory and socially-aware services; facilitates smart governance and flexible replication of services across cities and regions through a Virtual Machine generation mechan-ism in a sophisticated cloud environment. A large scale piloting of the platform integrates, deploys and tests various services in the areas of Cycling Safety, Participatory Urbanism, Augmented Reality and others while a large group of citizens from different countries are actively involved in the co-creation, validation and evaluation of the RADICAL approach on the basis of an innovative Living Labs approach.

776 Views, 375 PDF Downloads
Anastasia Panori, Agustín González-Quel, Miguel Tavares, Dimitris Simitopoulos, Julián Arroyo


During the last decade, there has been an increased interest on cloud computing and especially on the adoption of public cloud services. The process of developing cloud-based public services or migrating existing ones to the Cloud is considered to be of particular interest—as it may require the selection of the most suitable applications as well as their transformation to fit in the new cloud environment. This paper aims at presenting the main findings of a migration process regarding smart city applications to a cloud infrastructure. First, it summarises the methodology along with the main steps followed by the cities of Agueda (Portugal), Thessaloniki (Greece) and Valladolid (Spain) in order to implement this migration process within the framework of the STORM CLOUDS project. Furthermore, it illustrates some crucial results regarding monitoring and validation aspects during the empirical application that was conducted via these pilots. These findings should be received as a helpful experience for future efforts designed by cities or other organisations that are willing to move their applications to the Cloud.

24944 Views, 207 PDF Downloads
Athena Vakali, Stefanos Antaris, Maria Giatsoglou


Social networking data threads emerge rapidly and such crowd-driven big data streams are valuable for detecting trends and opinions. For such analytics, conventional data mining approaches are challenged by both high-dimensionality and scalability concerns. Here, we leverage on the Cloud4Trends framework for collecting and analyzing geo-located microblogging content, partitioned into clusters under cloud-based infrastructures. Different cloud architectures are proposed to offer flexible solutions for geo-located data analytics with emphasis on incremental trend analysis. The proposed architectures are largely based on a set of service modules which facilitate the deployment of the experimentation on cloud infrastructures. Several experimentation remarks are highlighted to showcase the requirements and testing capabilities of different cloud computing settings.

1422 Views, 639 PDF Downloads
Alkiviadis Giannakoulias


Data security is a major concern in cloud computing environments as they provide much scope for intruders to attack. Data centres in cloud environments hold valid information that end-users would conventionally have stored on their computers. Moving information towards centralised services may have an adverse effect on the security of users’ interactions with files kept in cloud cupboard spaces[1], for example accidental or deliberate alterations or deletions of information from the cloud server by the Cloud Service Provider (CSP). This necessitates the deployment of some sort of mechanism to ensure the safety of information integrity[2]. Public sector organisations have much to gain by adopting a cloud computing approach to service delivery in their ICT environments. However, these benefits must be reaped without compromising core requirements and institutional values.
This paper focuses on the security issues that may arise when public sector organisations consider transitioning to an Open Source Software (OSS) Infrastructure as a Service (IaaS) Cloud Infrastructure (OpenStack), although the same issues are likely to be found in other OSS cloud computing software like Apache CloudStack[3], Eucalyptus[4], and OpenNebula[5]. We examine legal implications, regulatory and standards compliance, new attack vectors resulting from vulnerabilities coming from virtualisation technologies, data integrity issues such as encryption and access controls, and security checks to be performed on the services prior to their movement to the cloud. In addition, some of the most important security threats in cloud computing are presented, followed by key recommendations on how to address them, namely security standards and certifications, service provider auditing, secure APIs, transport layer protection, authentication and encryption key management, and cloud service agreements.


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