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The energy efficiency is a substantial key design issues in such networks. An efficient routing protocol is critical to prolong the life of sensor nodes. This work presents a hierarchical multiple-choice routing path protocol (HMRP) for wireless sensor networks. According to HMRP, the wireless sensor network is initially constructed as a layered network. Based on the layered network, sensor nodes...
Sensing coverage is viewed as one of the critical measures of the performance offered by a sensor network. In previous studies, the sensing range of a node is generally assumed to be a determinate value in all directions. For most types of sensing signals emitted from a far field, the obstructions in the propagation path will induce an extra loss in the received signal power, and cause a large variation,...
Amidst the numerous active research efforts in wireless sensor networks which aim to push beyond the limits, we aim to significantly enhance the effectiveness of wireless sensors by integrating controlled mobility to realize a networked system of mobile sensors that functions collectively as an integrated unit. The All-teRrain Advanced Network of Ubiquitous mobile Asynchronous Systems (TARANTULAS)...
Knowing available energy in each part of a wireless sensor networks (WSN) is undoubtedly essential information. A simple approach to achieve this would be for sensor nodes to periodically report to the sink node on their available energy. This approach is expensive however in terms of energy consumption. In this work we apply several sampling techniques for obtaining such information in WSNs. The...
The proposed DRL is a distributed range-free localization approach. In order to save communication cost in localization, DRL reduces information flooding among nodes by dynamically changing each seed's flooding-hop to limit seed flooding in a local area; however, it still maintains the whole coverage. In addition, DRL allows all the nodes mobile and moving freely, while there is only a limited fraction...
Wireless sensor networks provide an alternative way of improving our environments, such as environment surveillance, hazard monitoring, and other customized environmental applications. Good coverage of service in a sensor network is an essential issue to ensure the service of quality. This paper studies the deployment of new sensor nodes so that the improvement of coverage is optimized. We propose...
Energy efficient office lighting systems can save 40% in electricity consumption in areas that receive significant amounts of daylight. In spite of the savings they can generate, daylighting systems are not widely used in the commercial office building. Barriers prohibiting adoption include high retrofitting costs, and difficulty estimating and maintaining worksurface illuminances. In this paper,...
In this paper we propose a novel cooperation control method for multiple unmanned aerial vehicles (UAVs) to search, detect, and locate ground targets. We assume that our UAVs are only equipped with rudimentary angle of arrival sensors and the ground targets are mobile radio frequency (RF) emitters. In addition to the mobility, we assume our targets emit signals with random duration and frequency....
With 250,000 NTD invested, 6 man power allocated, and 9 month time elapsed, we present BL-Live. The seemingly dumb, senseless BL Hall at National Taiwan University is transformed to an intelligent office building by a 30+ node sensor network. Two everyday services, Elevator Report and Smart Office, are implemented to better utilize the resources of the building and of the building residents. Our experience...
We propose a novel approach to design an asynchronous wakeup schedule (AWS) for the radio of the nodes in wireless sensor networks, in order to reduce the end-to-end latency with energy efficient data transmission. Each node is assigned a particular color and the process is repeated for grouping the nodes based on graph coloring of vertices. The wakeup schedule of a node's radio is fixed based on...
The power management system design is a key factor to determine the stability of a sensor nodes-based network environment. In the meanwhile, an application-based resource reconfigurable operating system can enhance the availability, maintainability and flexibility to the required services. In this paper, we propose an integrated power-saving mechanism and reconfigurable approach for the OS design...
Energy assessment of MAC protocols for wireless sensor networks is generally based on the times of transmit, receive and sleep modes. The switching energy between two consecutive states is generally considered negligible with respect to them. Although such an assumption is valid for traditional wireless ad hoc networks, is this assumption valid also for low duty cycle wireless sensor networks? The...
Sensor data streams exhibit unique characteristics such as inherent information uncertainty, intrinsic data sample correlations (both within and across streams) and resource constraints. In this paper, we introduce a new data model, called probabilistic stream relational algebra (PSRA), that extends conventional relational model to capture these new characteristics faced in managing data in sensor...
A commonly desired feature of large-scale, multi-hop, wireless sensor networks (WSNs) is the ability to reconfigure them after deployment. This reconfiguration could be as simple as changing a single parameter or as complex as replacing the entire application. Several protocols have been proposed to enable reconfiguration in WSNs, most of which use version numbers to distinguish new configurations...
A wireless sensor network consists of many tiny sensor nodes. The distributed memory spaces of sensors can be considered as a large distributed database, in which one can conduct in-network data processing. This paper considers a sensor network used for object tracking where distributed location updates and queries are performed inside the network. Although this issue has been intensively studied...
Taking advantage of the delay tolerance for objects tracking sensor networks, we propose delay-tolerant trajectory compression (DTTC) technique, an efficient and accurate algorithm for in-network data compression. In DTTC, each cluster head compresses the movement trajectory of a moving object by a compression function and reports only the compression parameters, which drastically reduces the total...
Sensor networks are being increasingly deployed for collecting critical data in various applications. Once deployed, a sensor network may experience faults at the individual node level or at an aggregate network level due to design errors in the protocol, implementation errors, or deployment conditions that are significantly different from the target environment. In many applications, the deployed...
Wireless sensor networks place sensors into an area to collect data and send them back to a base station. Data fusion, which fuses the collected data before they are sent to the base station, is usually implemented over the network. Since the sensor is typically placed in locations accessible to malicious attackers, information assurance of the data fusion process is very important. A witness-based...
Sensor networks have attracted intensive interests due to its extendable capability. In this paper, we attempt to answer a fundamental but practical question: "how should we deploy these nodes?" In most current designs, sensors are randomly or uniformly distributed because of their simplicity. However, the node deployment has a great impact to the wireless systems. It in essential highlights...
We examine the problem of detecting the direction of motion in a binary sensor network; in such a network each sensor's value is supplied reliably in a single bit of information: whether the moving object is approaching towards or moving away from the sensor. We demonstrate that the geometric properties of the network itself can be exploited for the detection of movement direction, from a single instance...
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