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This work presents the concept and methodology as well as the architecture and physical implementation of an integrated node for smart-city applications. The presented integrated node lies on active RFID technology whereas the use case illustrated, with results from a small-scale verification of the presented node, refers to common-type waste-bins. The sensing units deployed for the use case are ultrasonic...
The aim of this paper is to measure the impact that web services have on wireless sensor networks (WSN) when they are used for estimating the free size of parking places in smart cities. In particular, each wireless sensor mote (WSM) of these WSNs supports a fuzzy inference system (FIS)-based algorithm which predicts the aforementioned free sizes. Moreover, the inputs of this algorithm are the measurements...
The research field of event detection in realistic WSN environments has attracted a lot of interest, with health monitoring being one of its most pronounced applications. Although efforts related to the healthcare applications exist in the current literature, there is a significant lack of investigation on the performance of such systems, when applied in error prone and limited resource wireless environments...
Efficient collection of urban solid waste is a growing problem for cities and urban areas. Optimizing service routes based on actual waste bin fill level information can result in significant cost savings, reduced emissions, and improved city image. Fill level sensor installation and networking at an urban scale poses unique challenges. We describe Dynacargo, an innovative smart city application that...
Logistics or supply-chain services provide enterprises and organizations with the necessary level of flexibility and efficiency in order to retain competitiveness under the increasingly turbulent e-business area. Web-Services are utilized by organizations in order to integrate high and low level applications, thus providing a collaborative environment without affecting inter- and intra-enterprise...
A fuzzy rule-based and energy-efficient method for estimating the free size of parking places in smart cities is proposed. In particular, the estimation is the output value of a fuzzy inference system (FIS) which was implemented on each wireless sensor mote (WSM) of a wireless sensor network (WSN) placed in the ground below the parking places and it was observed that it requires 8.9 Kbytes and 5 Kbytes...
In the age of automation the need for indoor navigation has become quite important for a rising number of applications. In this work a strapdown INS (SINS) in terms of Inertial Navigation System is discussed. INS is an electronic device, containing an Inertial Measurement Unit (IMU), implementing a Dead Reckoning (DR) algorithm. This algorithm estimates position, velocity and orientation utilizing...
In this paper, we identify the security and privacy issues specific to wireless health monitoring devices and describe solutions for protecting wireless communications against side channel attacks and in particular traffic analysis attacks. This process takes place by means of data obfuscation and modifications of communication protocol architectures in order to limit exposed information of system...
This paper addresses the possibility of detecting presence of scar tissue in the myocardium through the investigation of vectorcardiogram (VCG) characteristics. Scarred myocardium is the result of myocardial infarction (MI) due to ischemia and creates a substrate for the manifestation of fatal arrhythmias. Our efforts are focused on the development of a classification scheme for the early screening...
Wireless Sensor Networks (WSNs) have limited power capabilities, whereas they serve applications which usually require specific packets, i.e. High Priority Packets (HPP), to be delivered before a deadline. Hence, it is essential to reduce the energy consumption and to have real-time behavior. To achieve this goal we propose a hybrid technique which explores the benefits of data aggregation without...
Wireless Sensors Networks (WSNs) emphasize the necessity of accurate event detection in realistic environments, while health monitoring comprise one of their most pronounced applications. Although respective fuzzy logic systems have been proposed based on vital and environmental sensors, there is a significant lack of investigation on the reliability of such systems when applied in error prone wireless...
In this work, communication security and privacy in pervasive user-centric e-health systems is studied. Our proposed security scheme is presented which uses a combination of mechanisms from Digital Rights Management and side channel attacks defense in order to ensure privacy and security for patients' data. In particular, communication between medical, limited-resource, embedded devices, carried by...
Wireless Sensors and Actors Networks (WSANs) emphasize the necessity of accurate event detection in order to achieve ubiquitous monitoring in realistic environments and perform appropriate actions on them. One of the most significant applications is health monitoring. This paper is aiming to propose a fuzzy logic system based on multi-sensor vital and environmental data, in order to detect distress...
Wireless Sensor and Actor Networks emphasize the necessity for cooperative communication between actors as well as sensors in order to achieve ubiquitous monitoring and efficient interaction in realistic physical environments and appropriate acting on them. This collaboration aims to assure appropriate decision making related to specific event detection, appropriate classification as well as selection...
The InterMedia project aims at progressing towards user-centric convergence of multimedia, by putting the user at the center of services (multimedia applications), devices and interfaces for the interaction. One of the main implications of the user-centric approach is the seamless and secure access to content, regardless of the users' location and terminal device(s), which requires suitable solutions...
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