The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For industrial automation applications using production machines and robotic installations, truly wireless systems offer advantages in terms of cost and flexibility. Requirements on power supply and real time communication for such applications are highly demanding, and cannot be satisfied with today's off-the-shelf systems. A novel factory communication system, called WISA (wireless interface for...
Energy is a scarce resource in wireless sensor networks. Usually, during the deployment phase an appropriate duty cycle has to be found to adjust the trade-off between energy consumption and transmission delay. In this paper an adaptation algorithm for the duty cycle adjustment during runtime of the sensor network is proposed. Thereby, the traffic originating from sensor nodes is monitored in the...
This paper presents an ad-hoc sensor network especially developed for a disaster relief application that provides the rescue teams with a quickly deployable, cost-effective and reliable tool to collect information about the presence of people in a collapsed building space and the state of the ruins. The hardware/software architecture of the wireless sensor nodes is developed for a low cost design...
The impact of the use of mobile devices by means of GPRS (general packet radio service) technology to access environmental information in real time, provided by sensors strategically placed in a metropolitan area has been studied with the objective of using this information to find out rainfall volume and phreatic levels in times of emergency. This allows the technical services to make the correct...
Developments in wireless sensor networks (WSN) hardware have led to a diversity of sensing devices, ranging from simple, micro-controlled boards to complex, highly integrated sensor-transceiver ICs. Given this diversity, the lack of proper abstraction and encapsulation mechanisms at the operating system level often forces developers to reimplement their sensing applications whenever a different sensor,...
Through a new computing paradigm, the wireless sensor networks revolutionize the environment monitoring, enabling applications in a wide range of knowledge areas. However, the process of creating these applications for these networks is still not simple, depending on the target operating system and hardware. In order to fill this gap, we developed a new programming model and a framework able to generate...
This paper introduces a new strategy for data gathering in wireless sensor networks that takes into account the need for both energy saving and for a reasonable tradeoff between robustness and efficiency. The proposed algorithm implements an efficient strategy for retransmission of lost packets by discovering alternative routes and making clever use of multiple paths when necessary; in order to do...
In recent years sensor networks have gained a lot of interest for industrial applications. The target of this paper is to define an analytical framework to evaluate the transient behavior of a sensor network in which sensors implement the energy-saving technique of idle/active states. The model captures the behavior of the battery lifetime of each sensor, and is able to evaluate the distribution of...
In this paper we propose a new reconfigurable architecture for sensor nodes, called RANS-300, which can operate in applications demanding low power to high performance, although sacrificing the lifetime of the sensor node. This node has a FPGA board, which can be dynamically reconfigured to add new configuration, and has a Compact Flash device to expand the node possibilities
The efficient use of the limited energy resources is the key challenge in the design of wireless sensor networks. Due to the paramount importance of the energy conservation, all protocols for these networks have to be designed taking into account their energy consumption. When simulation is used to analyze the performance of any energy-aware algorithm, it is necessary to have the information about...
The precise and "cost-efficient" localization is of particular interest in large wireless sensor networks. For this purpose, the pertinent literature proposes various algorithms, which significantly differ in localization precision, energy consumption, and hardware requirements. One of those algorithms, also known as coarse-grained localization with centroid determination, has received particular...
In this paper we present a new approach to calibrate sensors in sensor networks in an uncontrolled environment. The proposed algorithm makes a model of the distribution of the measured quantity. This model can be used to estimate and correct the bias of the sensor. The proposed, centralized calibration algorithm is a macro-calibration algorithm which tries to improve the system response as a whole,...
IEEE 802.15.4 is an emerging standard specifically designed for low-rate wireless personal area networks (LR-WPAN) with a focus on enabling the wireless sensor networks. It attempts to provide a low data rate, low power, and low cost wireless networking on the device-level communication. In this paper, we have established a realistic environment for the preliminary performance evaluation of the IEEE...
The management of ad-hoc networks raises interesting problems, that are particularly challenging for networks of mobile nodes. Considering the inherent complexity of these systems, the development of distributed applications relying on wireless communication protocols would be greatly simplified by the use of specific tools for supporting testing and step-by-step debugging. In this paper we describe...
Measurements of human physiological data allow inferring information on the mental and emotional state of a human. An increasing number of application developers and scientists of different domains want to make use of this additional information on users. To be accepted in practical application, systems of this sort have to be easy to use, should not intrude the user by wires, and it should be easy...
In recent years, concerns about the safety and security of critical infrastructures have increased enormously. These infrastructures can easily become subjects of physical and cyber attacks. In this paper, we propose a software architecture named security and protection architecture for physical infrastructures (SPAPI) for the protection of these critical infrastructures and for other non-military...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.