36 results about "Socially distributed cognition" patented technology

The invention provides distributed cognitive technology for an intelligent emotional robot, which can be applied in the field of multi-channel human-computer interaction in service robots, household robots, and the like. In a human-computer interaction process, the multi-channel cognition for the environment and people is distributed so that the interaction is more harmonious and natural. The distributed cognitive technology comprises four parts, namely 1) a language comprehension module which endows a robot with an ability of understanding human language after the steps of word division, word gender labeling, key word acquisition, and the like; 2) a vision comprehension module which comprises related vision functions such as face detection, feature extraction, feature identification, human behavior comprehension, and the like; 3) an emotion cognition module which extracts related information in language, expression and touch, analyzes user emotion contained in the information, synthesizes a comparatively accurate emotion state, and makes the intelligent emotional robot cognize the current emotion of a user; and 4) a physical quantity cognition module which makes the robot understand the environment and self state as the basis of self adjustment.

The invention discloses a distributed cognition wireless network spectrum allocation method based on coalition games. The problem that in the prior art, a cognition wireless network cannot fully use a totalization and whole and partial concept to allocate free frequency ranges is mainly solved. The method comprise the steps of detecting free frequency ranges, computing secondary user utility values, establishing stable coalition, selecting a coalition manager, merging data, refreshing secondary user trust values, allocating the free frequency ranges and refreshing the secondary user trust values. The method is fully combined with the advantages of the cognition wireless network, the trust values, participation values and requirement values are used to represent the utility values of a secondary user comprehensively, the secondary user satisfaction degree of the free frequency ranges and network service quality are improved, the secondary user is divided into the coalition to allocate spectrum resources, using ratio of the free frequency ranges and fairness of spectrum allocating are improved, and by refreshing the secondary user trust values, negative influence on a network from a vicious secondary user is lowered.

The invention discloses a method for spectrum allocation in a distributed cognitive wireless sensor network on the basis of Q study. The average throughput and the average energy efficiency ratio of the maximized distributed cognitive wireless sensor network are taken as objects, nodes in the cognitive wireless sensor network study from one another according to peripheral authorization frequency spectrum state change and allocation strategies of other nodes and finally adapt, the process is mapped into a distributed multi-agent Q study process, and the best spectrum allocation strategy is approximated by executing the best response Q study iterative algorithm in a timing sequence alternation mechanism. The method has the characteristics that the convergence speed is high, the calculation complexity is low, and the average throughput and the average energy efficiency ratio of the cognitive wireless sensor network are improved.

The invention discloses a method for distributed type cognitive radio network routing based on cross-layer design, which belongs to the technical field of cognitive radio network. The method comprises the following steps: establishing a coloring multi-graph model according to useable frequency spectrum information acquired by node perception; transferring a cross-layer design routing algorithm to search the routing between a source node and a target node, and simultaneously selecting communication signal channels between adjacent nodes; and updating the topology of coloring multi-graph and interface number of the nodes. The routing method adopts the cross-layer design on the routing selection of a network layer and an MAC layer, and concretely optimizes routing hop number and adjacent hop interfere under the condition of lower time complexity. The method is applicable to radio network, next generation heterogeneous network and so on.

The invention discloses a frequency spectrum switching method in a distributed cognitive radio network. Cognitive users establish and maintain the own preferred frequency point neighbor list and a route cache list. When the cognitive users as the source nodes detect the authorized users, the cognitive users performs the following steps of: updating the own preferred frequency point neighbor list; judging whether available frequency point exists between the cognitive users and the next hop neighbor node, if so, selecting a first new frequency point according to the available frequency point and transmitting data on the new frequency point, updating the available frequency point in the preferred frequency point neighbor list to available frequency point around the first new frequency point, and updating corresponding neighbor node; and otherwise, combining the route caching list for switching frequency spectrum. The invention takes route factor into consideration according to characteristics of the distributed network cognitive environment, provides the specific frequency spectrum switching flow and signaling design thereof and ensures completion of frequency spectrum switch, thereby ensuring the persistence of communication of the cognitive users.

The invention discloses a frequency spectrum sensing method. The frequency spectrum sensing method comprises the following steps of: independently sensing minor user nodes in an energy detecting mode, and acquiring the use conditions of frequency spectrums of the peripheries of the minor user nodes; acquiring a latest detection result by diffusing the minor user nodes within a two-hop neighbour range; computing the local sensing information and the synergetic sensing information of the minor user nodes; acquiring a judgment threshold according to master user communication behavior priori knowledges and the synergetic sensing information, and judging. According to the frequency spectrum sensing method disclosed by the invention, special appointed sink nodes or clustering computation is notneeded, the local sensing information diffusion of the minor user nodes is limited within the two-hop neighbour range, and the complexity and the synergetic spending of the synergetic detection of a distributed cognitive network are effectively reduced.

The invention relates to an active spectrum sensing switching method. The method mainly comprises the steps that a cognitive user senses and collects spectrum information of available channels; the cognitive user calculates to obtain next time slot idle probabilities of the channels, residual idle time correction factors of the channels and learning constants of cognitive user switching thresholds through long term observation; the cognitive user judges when to switch and which channel to switch; and the cognitive user carries out spectrum switching and recovers communication. According to the method, changes of the channels can be dynamically tracked and the spectrum can be switched rapidly; on-demand switching can be realized on the premise of not disturbing licensed users; the collision and switching times is effectively reduced; and the method can be applied to a spectrum switching process in a distributed cognitive radio network.

The invention provides a method and a system for probing a distributed cognitive radio channel. In a distributed cognitive network, random M users are selected, wherein M is less than N, and N is the length of discrete wireless signals; each user in the M users carries out inner product operation for respective wireless signals to acquire a compression sampling value respectively, and transmits the acquired compression sampling value to a fusion center; and the fusion center carries out frequency spectrum recovery for the wireless signals, and transmits back the frequency spectrum of the recovered wireless signals to each user terminal in the distributed cognitive network.

The invention discloses a multi-channel collaborative spectrum sensing method based on iterative filtering. The method includes: time is divided into time slices with fixed length through a reasonably designed frame structure. In each time slice, a secondary user with poor sensing performance is removed preferentially and does not participate in next round of cooperative spectrum sensing, and therefore the number of sensing users is reduced remarkably, and spectrum sensing performance is improved. Through design of the frame structure and a collaborative sensing scheme, the multi-channel collaborative spectrum sensing method based on the iterative filtering can solve problems of too much collaborative spectrum sensing users and malicious user interference existing in a distributed cognitive radio network. Theory analysis and simulation results show that: compared with an existing collaborative spectrum sensing method, the multi-channel collaborative spectrum sensing method based on the iterative filtering can effectively reduce the number of the secondary users participating in collaborative sensing in a loose condition, malicious interference users are removed, and simultaneously spectrum sensing performance of the cognitive radio network is improved.

The invention discloses a spectrum access method for a distributed cognitive radio system, which mainly aims to solve the problem of low queue stability of secondary users in the conventional cognitive radio system. The method is implemented by the following steps of: 1) defining primary users and the secondary users in the cognitive radio system; 2) regulating the arrival rate of the secondary users to make the arrival rate of the secondary users lower than a maximum service rate under interference limitation; 3) continuously snooping channels of the primary users by adopting a carrier sensemultiple access (CSMA) protocol, and accessing the channels after snooping results indicate random withdrawal when idle by the secondary users; and 4) adaptively regulating withdrawal time length parameters by the secondary users to make the stable service rate close to the arrival rate to finally achieve queue stability. The method has the advantages that the queue stability of the secondary user is achieved and that primary and secondary user collision probability is lower than the interference limitation, and can be used for the cognitive radio system with strict requirements on queue delay in the field of wireless communication.

The invention belongs to the field of cognitive wireless network technology, and discloses an agent-based intrusion detection method for a cognitive wireless network. The method comprises the following steps: selecting a node placement agent; determining whether the channel energy is greater than a threshold; detecting an internal node; performing attack detection; performing cooperative detection; and giving a response after the intrusion is detected. According to the agent-based intrusion detection method disclosed by the invention, attacks in a distributed cognitive wireless network are detected by using an agent-based intrusion detection system, the shortcoming of only performing single attack detection in existing security schemes can be overcome, and the overall security and robustness of the cognitive wireless network can be realized; and during detection, the attacks that occur inside the network can be detected through the coordination of multiple agents by using an ant colony optimization algorithm, the shortcomings that the computing power of secondary users is weak and a single agent cannot detect all known attacks can be overcome, and the high efficiency of the detection can be guaranteed.

The invention discloses a distributed cognitive radio network two-way channel reservation link constructing method which belongs to the technical field of cognitive radio networks, and mainly comprises the following steps: a node uses the perceptive capability of a radio terminal to spectrum holes, adopts the idea that a predecessor link reserves a public channel for a subsequent link as possible, reserves and distributes the channel resources of each link in a router from a source node to a target node hop by hop through a conflict prevention channel selection method, and establishes a two-way business transmission path from the source node to the target node. The method realizes channel pre-reservation and distribution in router selection, reduces collision and conflict, realizes the high-efficiency reuse of network resources, provides service quality ensuring capability for two-way multi-hop business transmission under the distributed environment, is applicable to cognitive radio networks, distributed multi-hop networks, wireless local are networks, next generation of heterogeneous networks and other application occasions.

Methods and systems for distributed cognition of digital content include receiving submissions from community members regarding a knowledge object. Each community member has a reputation value and each submission includes an evaluation value representing an evaluation of the knowledge object by the community member. A consensus evaluation is determined based on a calculated combination of the evaluation values in the submissions received and the reputation values of the respective community members who submitted the submissions. While submissions are being received, the consensus evaluation of the knowledge object is iteratively updated based on submissions received, being a calculated combination of the evaluation values in the submissions received and the reputation values of the respective community members who submitted the submissions. Additionally, the reputation value for each community member who submitted the submissions is iteratively updated based on a determined contribution of the respective community member's submission to the updated consensus evaluation.

The invention belongs to the technical field of vehicle-mounted communication, and discloses a spectrum sensing data tampering attack method, and a distributed cognitive vehicle-mounted network. The method comprises the following steps: an attacker monitors a common control channel, the attacker determines an initial moving speed, the attacker performs cooperative spectrum perception, and the attacker adjusts an own movement speed. According to the spectrum sensing data tampering attack method, according to the distribution condition of neighbor nodes of the attacker, the change rates of the neighbor nodes of the attacker and the current movement speed of the attacker, the movement speed of the attacker is dynamically adjusted to realize the quick change of the neighbor nodes, when the attacker detection difficulty is increased, the proliferation of erroneous sensing data across the entire network is accelerated, so that the spectrum sensing data are tampered more effectively, and theattack is more flexible.

The invention provides a conflict avoiding method based on a distributed cognitive database, and the cognitive database. The method includes: a first cognitive database receives a first request message sent by a system in which a first site is located, and modifying the occupation condition of a first shared resource as the pending state by the first site according to the first request message, wherein the first request message is used for applying the first shared resource by the first site; the first cognitive database obtains all adjacent sites of the first site; whether the adjacent sites are in a jurisdiction range of the first cognitive database is determined, and if not, the occupation condition of the first shared resource by the adjacent sites which are not in the jurisdiction range of the first cognitive database is obtained; and whether the first shared resource is distributed to the first site is determined according to the occupation condition of the first shared resource by the adjacent sites which are not in the jurisdiction range of the first cognitive database and the occupation condition of the first shared resource by the adjacent sites which are in the jurisdiction range of the first cognitive database. According to the method, the same shared resource can be prevented from being simultaneously allocated to the adjacent sites.