102 results about "Coverage control" patented technology

A pistol-shaped powder delivery device consolidates propellant pulse creation, powder storage, powder aerosolization and aerolsolized powdered delivery in a single device while providing dose, pattern and coverage control of the output spray. The single-hand-held, single-hand-operated device includes a housing having a handle portion that is selectively collapsed to generate a propellant pulse that is conveyed into and through powder stored in a reservoir mounted at an upward angle to the horizontal in a receptacle provided in the housing. Powder in the reservoir is caused to be aerosolized by the propellant pulse whereupon aerosolized powder exits the reservoir through an open end of, and elongate slots provided in the sidewall of, an elongate hollow member extending from an outlet in the receptacle through the stored powdered material into a head space in the reservoir. The outlet is connected a barrel portion for output of the aerosolized powder spray.

An overlay control circuit and method. In a preferred embodiment of the invention, a graphics controller provides main image data and overlay image data to a display device and includes a memory for storing the main image data and the overlay image data and a logic circuit for producing a signal that, in an active state, indicates that a particular location in the display device is to be represented by the overlay image data. The overlay control circuit fetches the main image data from the memory and is further adapted to respond to a transition in the indicating signal to the active state by halting the fetching.

The coverage control method includes at least: step S101 of detecting that a load of an own cell is higher than a predetermined threshold (Lth1) when there is another cell whose coverage partially overlaps the own cell; step S103 of selecting an accommodation candidate cell that is a candidate to which a mobile station accommodated in the cell is unloaded, from the another cell based on a load condition related to a communication load that is a coverage control execution target; step S106 of selecting a continuously accommodated mobile station that is a mobile station that continues to be a coverage control target of the own cell, from the mobile station accommodated in the own cell based on radio quality of the selected accommodation candidate cell; and step S107 of controlling a coverage of the own cell by targeting at the selected continuously selected mobile station.

A wireless parameter control device comprises: a serving cell prediction unit (11) which predicts a wireless cell which is a connection destination of a first wireless terminal within a first wireless cell upon assuming that an offset value which is added to the wireless quality which the first wireless terminal measures for each wireless cell is changed to a prescribed candidate value; a communication speed index prediction unit (12) which predicts a communication speed index of the first wireless terminal upon assuming that the offset value is changed to the prescribed candidate value and/or a communication speed index of a second wireless terminal within a second wireless cell which is present in the periphery of the first wireless cell; and a coverage control unit (13) which, on the basis of the result of the prediction of the communication speed index, controls the coverage of the first wireless cell and/or the coverage of the second wireless cell.

The invention relates to a novel underwater wireless sensor network point coverage control method. In the method, node depth adjustment is taken as a feasible mobile mode. The method comprises the following steps that: firstly, nodes determine depths of the nodes in reference to a distance between a Sink node and a water surface vertex and the depth of a monitoring water area; secondly, the nodes determine perception radiuses of the nodes according to a distance between the Sink node and a water bottom vertex in reference to a minimum perception radius and a maximum perception radius; thirdly, communication radiuses of the nodes are increased greatly till neighbor nodes with smaller depths are inquired, and a node with a smallest coverage target quantity is selected from a set of the nodes to take the selected node as a cluster head; and lastly, a cluster head node makes inner-cluster nodes hibernate and wake up. Compared with an existing relevant method, the method disclosed by the invention is more feasible. Moreover, indexes such as network coverage, a communication rate, energy consumption and balance, and a network life cycle can be optimized comprehensively.

The invention discloses a coverage control method of a wireless sensor network, relating to the technical field of wireless sensor networks. The coverage control method comprises the steps of: 101, determining a hot spot region set according to a historical movement track of a to-be-monitored target; 102, configuring a static node in the determined hot spot region set, and randomly configuring a movable node; 103, after the target to be monitored enters a to-be-monitored region, predicting a region of the to-be-monitored target, possibly occurring in future; 104, detecting whether the predicted region is covered, if the predicted region is covered, ending, and if not, continuously executing the step 105; and 105, completely covering the predicted region by mobilizing the movable node. According to the invention, through predicting and regulating positions of the nodes, when no target passes through, the to-be-monitored region is partially covered, and the predicted region is effectively covered after the target occurs, thus the coverage degree of the to-be-monitored target is greatly improved, a topological structure is flexible and variable, and the network survival time is effectively prolonged.

The invention provides a WLAN coverage control method and a sending parameter optimization method, device and system in order to lower the probability that terminals outside the coverage area of network information receive the network information and enhance network security. The method comprises the steps of obtaining optimal sending parameters, and using the optimal sending parameters or sending diameters obtained by calculating according to a multi-antenna scheduling algorithm sending a current frame to be sent according to the type of the current frame to be sent, wherein the type of the current frame to be sent comprises a management frame and a data frame. According to the WLAN coverage control method, the quality of receiving signals of terminals in the coverage area is guaranteed, the fact that the network key information carried by the management frame only can be received in a specific area is guaranteed, the safety of networks is enhanced, meanwhile, sending of the data frame and sending of the management frame is distinguished to be treated, the compromise between coverage control and multi-antenna processing gain is achieved to a certain degree, and therefore enough flexibility of multi-antenna scheduling is obtained.

A method of controlling the application of laser peening overlays on the surface of a workpiece to reduce the variability of shock waves generated therein, comprises applying an energy-absorbing overlay to a portion of the surface of a workpiece, measuring the thickness of the energy-absorbing overlay in at least one location on the energy-absorbing overlay, applying a transparent overlay material over the energy-absorbing overlay, measuring the thickness of the transparent overlay in at least one location on the transparent overlay, determining if the measured values for each overlay is within a specified range, and directing a pulse of coherent energy to the workpiece to create a shock wave therein when the measured values are within the specified range.

A loudspeaker system consisting of a plurality of direct-radiating electro-acoustical drivers arrayed along a curved line. While in one embodiment the curved line array may be a spiral array, in another embodiment it may be any curved line array (such as an arcuate array). The acoustical drivers are directly coupled to an acoustical waveguide without use of adapters or a throat section. The waveguide and the acoustical drivers may thus be oriented along the curved line so as to produce controlled vertical and horizontal angular coverage with improved phase coherence and reduced distortion. A plurality of phase plugs may be interspersed between the plurality of acoustical drivers to assist in equalizing the sound path to achieve uniform phase at the mouth of the waveguide.

The invention discloses a method for solving an optimal coverage control set of a static node in a wireless sensor network. With the adoption of the method provided by the invention, on the premise of keeping a certain coverage rate, a part of nodes enter a sleep state, so that the quantity of working nodes is reduced, the network energy consumption is reduced, and the network survival time is prolonged. Furthermore, a node set which has fewer working nodes, suitable sensing radius combination and low energy consumption, and meets certain coverage requirements can be found out by not considering communication and calculation energy consumption among nodes, considering energy consumption of a node sensing module, and using a property that the nodes have adjustable sensing radii. Three sub-functions, namely, energy consumption of the network node sensing module, a network coverage rate and a network node sleep rate, can be established, and a fitness function of a genetic algorithm is commonly formed by the three sub-functions; and the model is solved by using the genetic algorithm. An optimal working node combination with a large coverage range, fewer working nodes and low energy consumption, and an optimal sensing radius combination of the working nodes can be obtained.

A network management system includes: wireless link quality information collection means for collecting, from a mobile terminal that is connected to the mobile communication network, wireless link quality information that indicates wireless link quality measured by the mobile terminal, the wireless link quality information containing information about quality of wireless links between the mobile terminal and two or more wireless cells; coverage evaluation means for evaluating the wireless cell coverage on the basis of wireless link quality information calculated for each of the wireless cells using the wireless link quality information collected by the wireless link quality information collection means; and wireless parameter calculation means for calculating an amount of change in changing for a wireless parameter of a wireless base station on the basis of the result of the evaluation provided by the coverage evaluation means.

The invention discloses a covering and controlling method of the wireless sensor network which adopts the covering judgment of multiple intersection points. The method carries out the distributed type node dynamic sleep control on the wireless sensor network via a redundancy judgment rule of the covering degree of the multiple intersection points. At the initial period of the network operation, each node is at the working status and periodically broadcasts the working message to the neighboring node, simultaneously collects the working information of all neighboring nodes; when one node receives the information from the neighboring node, the node carries out the redundancy qualification judgment, and keeps or transforms the status according to the judgment result for realizing the distributed type node dynamic sleep control of the sensor network. The method judges the redundancy of the network node according to the necessary and sufficient condition for avoiding the occurrence of the blind spot of covering, simultaneously enables the number of the active nodes to decrease to the minimum, decreases the power consumption of the system, prolongs the service life of the network, and realizes the coverage-configurable network covering and controlling which has the advantages of completeness, reliability and high efficiency.

The invention discloses a wireless sensor network coverage maintaining method. The method is based on a probability calculation method to carry out a node redundancy judgment without node position information required, and the wireless sensor network coverage maintaining method carries out an energy balance through collaboration between neighboring nodes. After initialization of a wireless sensor network, operating time is divided into a number of rounds, each round in order carries out a coverage control phase and a state steady phase, and one round is followed by a next round when the one round ends. In the invention, the probability calculation method is used to calculate the node redundancy and coverage quality; the probability calculation method is simple; the node position information is not required; the node precise position information is not relied on; the cost of network hardware is significantly reduced; and the great application value is realized.