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The reliability and safety of industrial machines depends on their timely maintenance. The integration of Cyber Physical Systems within the maintenance process enables both continuous machine monitoring and the application of advanced techniques for predictive and proactive machine maintenance. The building blocks for this revolution — embedded sensors, efficient preprocessing capabilities, ubiquitous...
The Internet of Things is evolving around a plethora of vertical platforms, each specifically suited to a given scenario and often adopting proprietary communications, device and resource control protocols. The emerging need for cross-domain IoT applications and services highlights the necessity of interoperability across IoT platforms for a unified and secure sharing of and access to sensing/actuating...
In the recent decades, Internet of Things (IoT) is becoming much more popular than ever. The sensors in IoT are becoming heterogeneous and abundant. It is necessary to implement a middleware platform to deal with the tremendous growth in the number and variety of sensors. In this paper, we design and implement a modularized and dynamic platform based on OSGI framework to deal with the vast heterogeneous...
Publish/subscribe messaging pattern is often used as a communication mechanism in data-oriented applications and is becoming wide-spread, especially due to the expansion of the Internet of Things (IoT) services and applications. In addition to MQTT, which is one of the commonly used publish/subscribe protocols in the context of IoT, there are a number of other message queuing solutions, either open...
This paper presents the basic data flow in a wireless sensor network based on the current literature of the area. The first step is to study exactly how information and different data move in a system like this. Various frameworks have been proposed to represent data move from one layer to another, in order to reach the end-user. After introducing the basic parts of a sensor network in section 1,...
This paper presents the system architecture of an event-based building management platform. By incorporating the distributed computing technologies in its core, it is able to adaptively scale horizontally without the redesign and the configuration downtime. The commodity hardware and networks used, permit vertical scaling if performance requirements change after the deployment. Additionally, the proposed...
This dissertation explores issues of resilience in pervasive Internet of Things (IoT) deployments. It discusses facilitating the classic observe-analyze-adapt loop by addressing problems with devices, networks, and applications. We discuss our experiences with two projects: the Safe Community Awareness and Alerting Network, which leverages pervasive devices to extend a smarter safer home to residents,...
In the recent past, we have observed great advances in the way that people are connected, from social networks to small smart devices At the same time, we are entering the era of smart cities and the internet of things, where sustainability and quality of life are key concerns. Despite these trends, we did not observe an equal level of adoption of technologies or services that leverage the automation...
E-Health systems need to dynamically integrate a huge variety of medical sensors in order to provide a meaningful survey of a patient's condition. Devices like smart phones or gateways usually used as integrators, often underlie resource constraints and have to cope with the mobility of the patient. Therefore it is difficult to realize an overall integration middleware, that allows to handle a sufficient...
According to the specific business requirements of the meteorological wireless sensor network (MWSN), we analyze and summarize the principles and problems of the existing Web real-time communication technology, and put forward the realtime meteorological information publishing platform (RT-MIPP) solution based on WebSocket. We first analyze and classify the observational data of MWSN, and design the...
In order to properly support patient treatment, e-health systems need to dynamically integrate heterogeneous types of medical sensors and provide access to streams of sensed medical data independent of the patients location or the movement of the respective medical devices. Treatment processes usually include several steps and medical departments, which means that sensors have to be moved between...
Nowadays, Wireless Sensor Networks (WSN) are already a very important data source to obtain data about the environment. Thus, they are key to the creation of Cyber-Physical Systems (CPS). Given the popularity of P2P middle wares as a means to efficiently process information and distribute services, being able to integrate them to WSN's is an interesting proposal. JXTA is a widely used P2P middleware...
The Internet of Things (IoT) term is recently emerging to envision a global infrastructure of networked physical objects. As different definitions of IoT do currently exist, we specifically refer to IoT as a loosely coupled, decentralized system of smart objects (SOs), which are autonomous physical/digital objects augmented with sensing/actuating, processing, and networking capabilities. SOs are able...
The Internet of Things vision states that sensors and actuators shall be integrated into the global Internet to facilitate an interaction with and integration of the physical environment. The development of enabling technologies like uIPv6 and 6LoWPAN provide the basic requirements for this interconnection. However, a seamless Internet-connection and interconnection between sensors and actuators can...
Today's abundance of sensors and their wireless/wired networks, coupled with a growing plethora of applications, necessitate a dynamic approach to the assignment of tasks to a network. The current practice in WSN design is almost always application specific, due to functional and resource tradeoffs that have justified much of the tailored research done so far. Identifying this as a major bottleneck...
Wireless sensor networks (WSNs) are deployed to sense, monitor and act on the environment. Deployments in scenarios such as industrial sense and react environments require a set of functionality, and for both ease and reconfiguration capabilities it is important to offer an appropriate framework. We propose a framework for interaction with real-world devices by abstracting proprietary protocols, allowing...
The hardware capability and software functionality of sensor networks have continuously evolved. Apart from the merits brought by technological advances, this rapid upgrading pace poses great challenges to make heterogeneous sensor node platforms interoperate with each other. In this work, a service-oriented Application Programming Interface (API) is proposed for wireless sensor networks to handle...
In this paper, we explore the implementation of a smart monitoring system over a wireless sensor network, with particular emphasis on the creation of a solid routing infrastructure through the Routing Protocol for Low- power and lossy networks (RPL), whose definition is currently being discussed within the IETF ROLL working group. Our framework is based on a very lightweight implementation of the...
The problem of integrating the ad hoc networks and especially the Wireless Sensor Networks (WSN) with the Internet has attracted significant research and implementation efforts so far. Admittedly, not all of them have been widely adopted and established as prevalent standards or solutions in this technical area. In this paper we survey the proposed interconnection models and the relevant architectures...
Wireless Sensor Networks (WSNs), are a challenging and evolving area where applications can demand services, distribution, modularity and intelligence. WSNs are a versatile field with varying software architectures, which has led to the development of a plethora of WSN middlewares, management and reconfiguration protocols. To realize the potential of evolving WSN technologies and software architectures...
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