201 results about "Infinite loop" patented technology

The invention provides a robot indoor environment exploration,obstacle avoidance and target tracking method based on a ROS. Based on a grid map established through laser radar information,combined with local map deduction and global boundary searching,an independent exploration strategy is designed so that a moving robot can be prevented from getting into a local exploration infinite loop,and whole-indoor-environment exploration can be completely guaranteed. According to the method,real-time tracking nodes and shielding tracking nodes are designed with an improved Kalman filtering method and aMeanShift method in the ROS,the real-time problem and the complete-shielding problem of target tracking of the moving robot are solved,the computing speed of the system is increased,target search time is shortened,and the real-time requirement of tracking is met; when a target is completely shielded,the shielding tracking nodes forecast and track the target according to previous state information,and after shielding is ended,a target is newly locked,tracking modes are automatically switched,and the target is tracked through the real-time tracking mode.

The invention discloses a method and a device for detecting and processing system faults. The method comprises the following steps: sending a first-grade dog feeding signal by an interrupt service routine and receiving a second-grade dog feeding signal of a system detection task; when detecting a task endless loop or task exception, carrying out system exception handling according to a pre-set processing strategy; when the interrupt service routine cannot receive the second-grade dog feeding signal in pre-set time, stopping feeding the first-grade dog feeding signal by the interrupt service routine and restarting the system. According to the method and the device, automatic detection of faults of a software system can be realized and the system is automatically recovered according to a user strategy; the system exception of a system starting process and a system operation process can be detected simultaneously and is automatically recovered; exception types in an operation process of the system can be identified by classifying, and the exception judgment and self recovery can be carried out according to the user strategy; system exception detection and self-recovery strategies can be configured by a user; exception reasons can be recorded and can be inquired.

A Continuous Data Beaming System that is capable of continuously and automatically beaming data by direct transmission from one Host Device (source device or "beaming station") to another Remote Device (receiver device) every time the receiver needs the data. The Host Device constantly searches to find an IrOBEX compliant Remote Device, checks availability for an infrared connection, completes the connection to the Remote Device and transfers a data object through the respective infrared ports. If a failure occurs during any of the foregoing steps, the program automatically returns to searching. This progresses in an infinite loop, thereby accomplishing continuous, wireless, infrared data transmission. During the continuous transmission, no Remote Device other than BeamMaster can interrupt the continuous beaming. The BeamMaster Device allows the system to halt for a brief period, thirty seconds or less, so that files or data objects may be swapped. Continuous beaming resumes once the files are swapped or the time has expired. The Host Device automatically transmits data to the receiver device every time a receiver shows up and needs the data, thereby effectively achieving one-touch wireless synchronization.

The invention relates to an English word memorizing turntable which effectively settles a problem of no interest in studying English. The technical solution of the English word memorizing turntable is characterized in that the English word memorizing turntable comprises a word ball and a turntable; the center of the turntable is a chamber housing; the inner part of the chamber housing is connected with a ball serving housing through bent pipeline; the inner space of the ball serving housing is divided into a ball serving chamber and a screening chamber; and the ball serving chamber is internally provided with a plurality of uniformly arranged extension springs. The English word memorizing turntable has an ingenious structure and can realize random falling of English words. Furthermore in each English word selection, random selection is realized, thereby preventing infinite loop of some words. Furthermore in English studying, a child can participate in, and playing amusement is improved.

One embodiment of the present invention provides a system that facilitates multi-versioning loops to facilitate modulo scheduling. Upon receiving a computer program, the system analyzes the code to locate loops within the program. When a loop is located, the system examines the loop termination condition to determine if it is based on a “not-equal-to” condition that makes it hard to determine beforehand whether the loop will terminate. If the loop termination condition is based on a “not-equal-to” condition, the system creates multiple versions of the loop, at least one of which will terminate and can be modulo scheduled, and at least one of which might be an infinite loop and consequently cannot be modulo scheduled.

The invention discloses a method for detection task closed loop, which comprises: in a system of a priority level-based task dispatch strategy, a closed loop detection task with the least priority level shall be preset; when the system clock is interrupted, detect whether the duration of the closed loop detection task for non-operation is greater than the preset threshold value, so as to decide that the task closed loop occurs in the system. The invention also discloses a system detecting the task closed loop. The invention ensures that in the system of the priority level-based dispatch strategy, the situation of missed detection on the low priority level task closed loop won't happen, and the detection of the task closed loop doesn't rely on the task dispatch strategy of the system.

The invention provides an STP link layer state machine optimization method, which comprises the steps of detecting whether an STP link layer state machine is in an HL_SendChkRdy state or not, if the STP link layer state machine is in the HL_SendChkRdy state, determining whether a conflict event occurs in the STP link layer or not, and when the conflict event occurs, migrating the STP link layer state machine to an L_SyncEscape state, and executing state machine skip and subsequent service processing in the L_SyncEscape state. According to the invention, the operation mechanism of the link layer state machine is improved, the endless loop problem of the link layer state machine in the STP scene is solved, and the support of the SATA link layer to the STP scene is perfected.

The invention discloses a system and method for long-time acquisition and playback of multi-specification 10Gbps network signals, relating to the technical field of high-speed network signal acquisition and playback. The system and method can simultaneously achieve the acquisition and playback of high-speed network signals with various specifications such as 10Gbps Ethernet and 10Gbps SDH, and cansolve the previous single-specification signal acquisition and playback mode. At the same time, by adopting a high-speed large-capacity high-performance SSD memory disc and a multi-threading technology, the system can achieve long-time line speed acquisition and playback of 10Gbps network signals, and the acquired signals can be continuously stored in real time. In addition, the system provides afunction of playing back the signals according to the line speed and a timestamp or in a constant-speed mode, can also specify the number of data playback times, ensures that a default playback modeis an infinite loop playback mode, and further provides various methods for data signal analysis.

Based on chaos principle about sensitive dependence to initial value, infinite looped key stream is generated providing very high security. Length of cryptographic key is variable, could be any length theoretically (recommend 64-4096). Initial process makes subtle change of cryptographic key lead to non-correlative cryptographs. The random number agitation method in the invention adds random unpredictable information into encrypting process. Thus, even plaintext is same, but the cryptographs are different in each time. Thus, it is not possible to attack and explain the cryptograph. Moreover, the time for the method is not dependent to length of the cryptographic key. Thus, the speed is higher than other methods with same intension. The invention is suitable to various platforms. Wide application prospects are used in Internet and handphone.

An infinite loop or infinite loop like task detection method refers to computer operation system field, especially infinite loop task detecting and processing technology. Present invention overcomes problem of more system resources wasting in current infinite loop or infinite loop like technical detection, determining infinite loop or infinite loop like task and calling system task storehouse accuracy positioning infinite loop position through generating system highest priority infinite loop monitoring task and system lowest priority infinite loop test task. In priority occupying type operation system, present invention only uses two simple tasks effectively detecting infinite loop or infinite loop like task without utilizing system clock interruption handling and task switching processing, to judge whether infinite loop or infinite loop like occurred, having small process frequency and saving CPU resource.

The invention discloses a method and a system for verifying a business flow. The method includes mapping an original business process in a BPMN (business process modeling notation) model to a Petri network model according to mapping strategy and forming a mapped business process; and verifying the mapped business process to judge whether the original business process is erroneous or not. The method and the system for verifying the business process have the advantages that the business process is mapped to the Petri network model to be verified, the problem that whether the original business process in the BPMN model can be deadly locked or be in infinite loop or not can be verified, accordingly, staff can find out the problem in time to adjust the original business process, and actual needs are met.

The invention discloses a parallel construction method limiting a Delaunay triangulation network. Work in aspects including construction of the Delaunay triangulation network, embedding of constraint conditions and parallel calculation of constraint embedding is carried out. The Delaunay triangulation network is constructed via a pointwise insertion method, construction of a convex hull uses a Graham scanning method, constraint embedding uses a method in which a polygon is subdivided into parts, a possible endless loop of an edge switching algorithm is avoided, a constraint embedded non-common influence domain is parallelized in parallel calculating, and time of constraint embedding is shortened greatly. Parallel programming needs to be combined with practical conditions to realize parallel calculating in serial codes which are large in data bulk and operand and can be parallelized, the system cost for developing multiple threads is much lower than benefit from improvement of parallel calculating due to proper task decomposition, effective data conflict processing and correct selection of parallel strategies, and advantages of parallel calculating are made obvious.

The invention discloses a small fixed-wing UAV attitude control method based on an H infinite loop forming algorithm. A fixed-wing UAV attitude controller is designed by combining related knowledge ofthe classical control theory and the modern control theory. A control loop includes a PID controller, a low pass filter, an anti-integrator saturator, and an H infinite controller. The PID controlleris arranged at a forward channel to increase the low frequency gain of the system and reduce the steady state error. The low pass filter is applied to a feedback channel and is mainly used for suppressing high frequency noises in UAV sensor data. The anti-integrator saturator is used for preventing the flight performance from being affected by output saturation of the steering engine. The H infinite controller is used for improving the attitude control robustness of the UAV. Therefore, the fixed-wing UAV can keep the high robustness in a complicated environment or on the condition of changingparameters of the UAV; and the error of command tracking is reduced and the control accuracy is enhanced.

The invention provides an elastic Key-Value pair data storage method based on RDMA (Remote Direct Memory Access) and HTM (High Temperature Modulation). A server-client architecture mode is designed and followed, and the method comprises the steps that at a server side, an improved G-Cuckoo Hash data management mode is given in combination with a Hashmap; the kick-out infinite loop between Hash tables caused by searching for idle positions in the data insertion process is avoided. the bottleneck problem of key value pair storage performance caused by round response required by the traditional network message transmission between the client and the server is analyzed; an Infiniband remote direct memory access RDMA technology is used, an RDMA network communication engine is designed, a data access request is received, and a data request result is sent back; a hardware transaction memory HTM technology is utilized to realize a two-section lock protocol lock operation and ensure the atomiccharacteristics of data operation; and a key value is used for self-verifying the check code of the data to guarantee data consistency. The basic operation speed of the key value on the data can be greatly improved.

The invention discloses a multichannel robustness damping control method based on a static state H-infinite loop shaping method; the multichannel robustness damping control method comprises the following steps: adding a robustness damping controller to simultaneously control subsynchronous oscillations and low frequency oscillations; using a solve linearity matrix inequality to directly solve the controller; using the total least square rotation constant technology to identify a system oscillation modal and a reduced-order model; using a Butterworth band pass filter to decompose different oscillation modals into a plurality of channels; using the static state H-infinite loop shaping method to design different robustness damping controllers for different channels, thus reducing mutual influences between the controllers. Compared with a conventional proportion-integration-differential (PID) controller, the multichannel robustness damping control method has better control effect, can simultaneously control the subsynchronous oscillation and low frequency oscillation, and has better robustness; in addition, the controller is low in order, and output feedback is employed, so engineering practice is easy; the multichannel robustness damping control method is small in computational complexity and low in algorithm complexity.

A method and system are provided for broadcast message filtering in SAS expanders. Common SAS topology defined by ANSI T10 specification only supports spanning tree topology (without loops) interconnection among multiple end devices and expander devices. Broadcast message filtering provides a mechanism to selectively discard broadcast messages, or primitives, in the SAS expanders to break the infinite loop path that broadcast primitives can traverse. This enables new SAS physical topologies with loops that are otherwise difficult or impossible to realize using SAS expanders that handle primitive broadcasts according to the definition of the SAS standard. By allowing redundant paths in a SAS topology, the problem of infinite broadcast flooding in SAS topology is reduced. Selectively forwarding broadcast messages can be based on whether the broadcast was originated at the source phy, or received by the source phy, or based on whether the source phy is a filtered phy.

The invention discloses an AIS-system-based wireless relay network implementing method. The AIS-system-based wireless relay network implementing method comprises the following steps: providing a shore-based AIS base station and wireless relay network ship-borne equipment, wherein the wireless relay network ship-borne equipment comprises a wireless relay network protocol module and an AIS mainframe; according to the shipping dynamic state of a ship in a shipping lane, actively sending an AIS message for monitoring the ship in the shipping lane and automatically forwarding AIS monitoring information of other ships by the wireless relay network ship-borne equipment; setting a forwarding frequency flag bit in a relay message by the wireless relay network protocol module so as to prevent two pieces of equipment from entering an infinite loop state in which the two pieces of equipment repeatedly forward the relay message of the opposite side mutually; periodically broadcasting a coverage identifying message of the AIS base station outwards by the shore-based AIS base station, receiving and indentifying the forwarded ship relay message, and converting the relay message into AIS position information after the relay message is analyzed. After application of the AIS-system-based wireless relay network implementing method, the monitoring ranges of a coastal area and an inland AIS base station can be widened, the AIS monitoring effect on a ship in an inland shipping lane can be improved, communication expenses are not generated and the application value is high.