33results about How to "Consumption balance" patented technology

The invention discloses a data communication method of a wireless sensor network, which can solve the problems of the traditional cluster routing protocol that the energy consumption of the cluster head is high, and the network bottleneck can be easily formed, thereby making the energy consumption of nodes uneven and shortening the network lifetime. The data communication method comprises the following steps: providing a wireless sensor network topology; designing a method for establishing clusters in a network clustering process; defining gateway nodes used for receiving and transmitting data between adjacent clusters; designing a data transmission routing process, wherein a cluster head node is only responsible for finding a data transmission path, and actual data are transmitted along the found path through the gateway nodes, thereby realizing the separation of path finding and data transmission and reducing the load of the cluster head node; and designing an in-cluster routing method used for transmitting the data to a designated gateway node. The data communication method designed in the invention can effectively reduce the energy consumption, balance the network load, and prolong the lifetime of the network. Therefore, the data communication method is applicable to large-scale wireless sensor networks.

The invention discloses a fixed point vector processor and a vector data access controlling method thereof, relates to a vector processor used for online time series prediction and aims to solve the problems that an existing vector processor incapable of optimizing a specific method is poor in universality and cannot satisfy requirements on online computation. The fixed point vector processor comprises a program counter, a microcode memorizer, a vector memorizer, an arithmetic logic unit and a data control unit. A complete fixed point vector processing procedure is formed by every signal processing procedure of the program counter, the microcode memorizer, the vector memorizer, the arithmetic logic unit and the data control unit. By means of ALU (arithmetic logic unit) designing, an ALU structure of each data path can be changed flexibly according to computation needs, flexible configuration of an instruction set is achieved, and accordingly, the fixed point vector processor and the vector data access controlling method are applicable to occasions required by complex computation.

The provided data inquiry method in sensor network comprises: determining the energy message for every sensor node in the network, and selecting the node with the maximal residual energy as the cluster center, as well as the sensor node for non-cluster center; the non-cluster center sensor sends self-collected data to corresponding cluster center, and enters sleeping state; the cluster node receives inquiry request and obtains the objective data for report. This invention reduces total energy consumption and improves service time of the sensor network.

The invention discloses a safety start method of a tree topology in an IPv6 over low power wireless personal area network (6LoWPAN), belonging to the filed of networks. The method comprises mutual authentication and trust assessment. Before node deployment, a network deployer allocates a unique identification (ID) and key for each node, so that mutual authentication can be achieved between two nodes if only the ID of the opposite party is known; and when a child node selects father nodes to access a network, trust assessment is carried out on the candidate father nodes, and a utility value method in a multi-target objective decision technology is utilized to comprehensively assess three indexes, namely the number of hops from the father node to a base station, consumed energy and time delay, so as to select an optimal father node. According to the method, node energy is saved, mutual authentication can be carried out by only IDs of the nodes and a small amount of information exchange but without the participation of a base station, and attack of malicious node can be resisted. Due to the introduction of trust assessment, the sideness solely depending on energy or hops is avoided, the energy consumption of the whole network is balanced, and the life of the network is prolonged, thus the method can be applied to scenes with small amount of node movement.

The invention discloses an automatic single-data multi-confirmation send-and-wait repeat-request method of a wireless sensor network. Aiming at the energy consumption of a sensor node, a mechanism that a data packet is received and subsequently a plurality of ACK (Acknowledgement Character) confirmation packets are fed back to ensure the reliability of network transmission is adopted, although the number of the ACK confirmation packets transmitted by a receiving party is increased, the times that data packets consume great energy when being retransmitted as an ACK is lost and the data packets are successfully transmitted for a transmitting node are reduced, so that the energy consumption of the node is reduced wholly, and the service life of a network is prolonged.

The invention discloses a consumption equilibrium method and system based on message queues. The method comprises: an ordering step: a consumer client orders multiple message queues in real time according to numbers of non-consumption messages of the multiple message queues; and a consumption step: when any thread executed by the consumer client requires a consumption message, and with the message queue having the largest number of the non-consumption messages as a target queue, a message is obtained from the target queue for consumption. By adopting the consumption equilibrium method in the technical scheme of the invention, no matter a producer client generates the message in which policy, or whether the consumer client draws the same number of messages at each time, or whether a server has a downtime, the consumption equilibrium method disclosed by the invention can be used for guaranteeing that the message queue having the largest non-consumption number is consumed at the next consumption, maintaining the consumption equilibrium of the entire message queue and preventing the message backlog phenomenon of a certain message queue.

The invention discloses a routing method for overcoming congestion of the tree type Zigbee network. The method comprises the following steps that a coordinator node establishes the Zigbee network, and other nodes establish neighbor tables thereof when accessing the Zigbee network; the tree type network is maintained; target address of a data frame is detected, and data is forwarded according to different target addresses; if a link to a father node is in the busy state always, information of the neighbor table is obtained, the neighbor table is inquired, a data request is sent to a neighbor node, the level of the neighbor node is higher than or equivalent to that of the present node, and the relation between the neighbor node and the present node is not a father-son relation; self information is added to a response frame again, and the node updates the neighbor table according to the response information; the neighbor node of the lowest load is selected for horizontal communication; and after the neighbor node receives the data frame, the data frame is forwarded continuously until that the data reaches the target node. When congestion occurs in the trunk, congestion can be effectively alleviated, time delay of the network is reduced, and the total energy consumption of the network is reduced.

The invention provides a method and a device for classifying data packets. The method comprises the following steps of receiving to-be-classified data packets, and determining an ACL (Access Control List) for classifying the to-be-classified data packets; matching the to-be-classified data packets with the ACL according to a preset matching method to which the ACL belongs, and classifying the to-be-classified data packets according to a matching result, wherein the preset matching method to which the ACL belongs is determined according to the following methods of determining that the ACL is matched by adopting a linear matching algorithm when the filtering rule number of the ACL is smaller than or equal to a first preset value, and performing matching by adopting a packet classifying algorithm of the linear matching algorithm when the filtering rule number of the ACL is greater than the first preset value. According to the method provided by the invention, the classifying efficiency of the data packets can be improved, the classifying speed is increased, and meanwhile, the memory consumption can be taken into consideration, so that the matching speed and the memory consumption are more balanced.

The invention discloses a micro-grid wireless sensor network energy consumption optimization method based on cooperative coverage. The method comprises the following steps: constructing a wireless sensor network model for monitoring distributed renewable energy sources in a micro-grid; constructing a cooperative coverage set according to different types of sensors and different monitoring tasks inthe wireless sensor network; communicating the cooperative coverage set of each group of monitoring tasks in the wireless sensor network in a hierarchical clustering mode; in the operation process ofthe wireless sensor network, using an improved ant colony algorithm for scheduling a cooperative coverage set. According to the invention, the monitoring task of the wireless sensor network in the electric power Internet of Things can be better realized, the life cycle of the wireless sensor network is far longer than that of a traditional sensor cooperation model, and the performance is more obvious along with the increase of the number of sensor nodes.

The invention discloses a complex waveform triggering method based on segmented Chebyshev distance, and the problem of multiple triggering is solved by introducing the waveform similarity measurement.A similarity measurement principle is utilized, and a real-time captured sample waveform is compared with a stored reference waveform. The similarity value represents the approximate degree of the input waveform relative to the reference waveform, and trigger pulses can be generated according to the similarity threshold value, so that complex signal waveforms can be stably displayed. Meanwhile, afuzzy membership degree function is introduced to prevent the comparison of the waveform similarity from being influenced by the actual amplitude of the waveform, and the influence of the diversity of the noise levels, so that the waveform similarity judgment is more accurate. In practical application, the segmented length of the algorithm can be dynamically adjusted according to a specific hardware design platform, and the balance of algorithm response speed and hardware resource consumption is guaranteed.

The invention discloses a low-energy diesel engine off-gas treatment system suitable for high exhaust flow. The low-energy diesel engine off-gas treatment system comprises a controller and two regeneration systems used alternately, one regeneration system comprises an air supply unit, an ignition unit, a three-way air channel and a packaging unit wrapped with DPF, a fuel oil supply unit is connected to the ignition unit, a first temperature sensor and a second temperature sensor are correspondingly arranged on the upstream and downstream of the DPF, a pressure sensor and a differential pressure sensor are connected to the DPF, and a mass flow sensor is arranged at the outlet of the air supply unit; and the other regeneration system comprises a secondary air channel, a secondary ignition unit, a secondary three-way air channel and a secondary packaging unit wrapped with secondary DPF, a fuel oil supply unit is connected to the secondary ignition unit, a third temperature sensor and a fourth temperature sensor are arranged on the upstream and downstream of the secondary DPF, and a secondary pressure sensor and a secondary differential pressure sensor are connected to the secondary DPF. The low-energy diesel engine off-gas treatment system can regenerate with minimum energy consumption under high exhaust flow.

The invention discloses an error correcting code decoder. The error correcting code decoder comprises a generating flow from ImpulseC software to FPGA (Field Programmable Gate Array) hardware. The generating flow comprises the following steps: performing C preprocessing on an ImpulseC design file, and performing C language analysis; determining hardware and software processes in application by using a compiler at a C language analysis state; performing an initial optimizing flow, and converting corresponding loops into equivalent concurrent statements by using the compiler at a loop unrolling stage; performing secondary optimization to generate a simulation-supporting HDL (Hardware Description Language) file which describes various processes, flows and elements described in an ImpulseC source element; and generating FPGA decoder hardware. Through the way, the error correcting code decoder can be applied to the fields of digital television demodulation chips, high-speed broadband mobile communication systems, compressed image transmission, wireless local area networks and the like, is used for performing error control and detecting and correcting errors introduced in a signal transmission process, and is an important component for ensuring reliable transmission of data.

The present invention provides a copper ion temperature difference power generation system and method. The system comprises at least one cold-end electrode, a hot end electrode, a housing and an electrolyte. The at least one cold-end electrode is used as a battery cathode, the hot end electrode is used as a battery anode, the housing is configured to install the cold end electrode and the hot endelectrode, and the electrolyte is used to generate electrochemical reaction with the electrode. A novel temperature difference power generation technology is provided and a primary battery principle is employed to change the activity degree of the materials by employing the temperature difference so as to improve the efficiency of the temperature difference power generation.