31 results about "Free interval" patented technology

The invention provides a joint fractal-based method for detecting a small target under a sea clutter background. The joint fractal-based method is higher in detection probability. The detection problem of a non-additive model is transformed into a classification problem, i.e. whether a target exists or not is equivalent to belong to a class in which a pure sea clutter exists, and a characteristic joint detection algorithm is provided. A bilogarithmic graph is established by using a trend fluctuation method through sea clutter data, a slope, namely a Hurst index, is fitted by using a least square method within a scale-free interval, and is used as a characteristic scalar, a nodal increment of a keypoint in the bilogarithmic graph is used as another characteristic scalar, therefore, a double-scalar obtained by each group of sea clutter data corresponds to one point in the bilogarithmic graph, n groups of corresponding points (i=1,...n) of the pure sea clutter data are obtained by using the steps, a space optimal classification line omega is obtained by using a convex hull function, sea clutters of regions in which the target possibly exits are obtained by using the same steps, and finally, by using whether the points exist in the space optimal classification line omega or not as a criterion, when the points exists in the space optimal classification line omega, no target exists, and when the points are outside the space optimal classification line omega, the target exists.

Apparatus and methods for reducing power consumption of a data transfer interface in a computer system are disclosed. In one embodiment, a method for reducing power consumption of a data transfer interface between a first device and a second device, includes, identifying a free interval between a first data and a second data, disabling the data transfer interface during the free interval, enabling the data transfer interface at the end of the free interval, and transmitting the second data. The method may also include a step of notifying the second device that the data transfer interface is being temporarily disabled. Another embodiment, for example, includes the transfer of display data (or video frames) over an interface, such as, a DisplayPort interface, between a graphics controller device and a timing controller device in a computer system.

The invention provides a method for constructing time-frequency hop sequence clusters in a cognitive radio TFH-CDMA system. The method comprises the following constructing processes: firstly, constructing q optimal hop frequency sequence clusters with the length of L according to the current available frequency point n of the system; then, constructing L direct expansion sequences with the lengthof L, forming one time-frequency hop sequence by any one pair of arbitrary hop frequency sequences and direct expansion sequences and constructing time-frequency hop sequence clusters with the numberof Lq; and constructing corresponding hop frequency sequences when increasing or reducing the number of the available frequency points of the system, and then reconstructing direct expansion sequences with the length equivalent to that of the hop frequency sequences, thereby generating novel time-frequency hop sequence clusters. The time-frequency hop sequence clusters constructed by the invention have the advantages of much number of the sequences, large impact-free interval and high utilization rate of frequency spectra and can be directly applied to a TFH-CDMA communication system based oncognition.

The invention discloses a mobile communication device, which is provided with a medium substrate and an antenna. The medium substrate is provided with a ground plane, a first ground plane-free interval and a second ground plane-free interval. The ground plane comprises a master ground plane and a raised ground plane. The raised ground plane is electrically connected with the master ground plane, and is extended between the first and second ground plane-free intervals to separate the first and second ground plane-free intervals. One edge in the raised ground plane is aligned with one edge in the medium substrate. The antenna has a plane structure, and is positioned on the medium substrate and provided with a feed-in part and a radiation part. The feed-in part is positioned at the first ground plane-free interval. The radiation part strides the raised ground plane. One end of the radiation part is positioned at the first ground plane-free interval, and is electrically connected to the ground plane, and the other end of the radiation part is positioned at the second ground plane-free interval, and is electrically connected to the ground plane. A coupling space in the first ground plane-free interval is reserved between the radiation part and the feed-in part. By the coupling space, the radiation part is excited by a capacitor of the feed-in part in a coupling way. The mobile communication device increases the degree of designing freedom.

The invention discloses a heuristic mining method of an optimal comparing sequence mode of free interval constraints. The heuristic mining method comprises the following steps of: step S1, inputting a positive example sequence set, a negative example sequence set and the expected mining quantity of comparing sequence modes; step S2, randomly generating gene type candidate mode codes with the pre-set quantity; step S3, obtaining a candidate comparing sequence mode corresponding to each gene type candidate mode code; step S4, calculating the contrast ratio of each candidate comparing sequence mode; step S5, judging whether the current gene type candidate mode codes meet method finishing conditions or not; if so, taking the k candidate comparing sequence modes with the optimal contrast ratio as a final mining result; otherwise, executing step S6; step S6, selecting the current gene type candidate mode codes; and step S7, forming new gene type candidate mode codes and returning to the step S3. By adopting the comparing sequence mode mining method provided by the invention, a condition that a result is lost due to improper parameter setting under the condition that a user does not have priori knowledge is avoided.

The invention discloses a thin mobile communication device. The thin mobile communication device comprises a medium substrate, a ground plane and an antenna, wherein the medium substrate comprises a ground plane-free interval comprising a first edge and a second edge; the ground plane is positioned on the medium substrate; the antenna, which is a planar structure, includes a first working frequency band and a second working frequency band and is formed in the ground plane-free interval on the medium substrate, the first edge and the second edge of the ground plane-free interval are surrounded by the ground plane, the first edge is used for the passage of a feed-in connecting wire of the antenna, the first edge is a feed-in edge and the second edge is a non-feed-in edge, the distance between a side of the antenna and the second edge is less than 3mm, and the side is at least 5mm long and is in short-circuit connection with the ground plane. The device of the invention can obtain excellent input impedance matching and radiation characteristics by tightly combining the antenna with the adjacent ground plane.

The invention relates to a double-front-axle automobile steering system which comprises a steering gear, a steering gear rocker arm, a first-axle transition pull rod, a first front axle transition arm, a first-axle straight pull rod, a booster cylinder, a booster cylinder support, a first front axle steering knuckle arm, a first front axle, a second-axle straight pull rod, a second front axle steering knuckle arm, a second front axle, a first-axle steering knuckle and a second-axle steering knuckle. Compared with existing steering systems, the double-front-axle automobile steering system has the advantages that one transition pull rod and one transition rock arm assembly are omitted, so that structure of the steering system is simpler while weight of the same is lowered, and manufacturing cost is saved; the transition pull rod and the transition rocker arm assembly are omitted, so that loss of steering force is reduced and steering is easier and more convenient; free interval of the steering system is reduced while steering of the same is more accurate. The steering device is compact in arrangement space, so that arrangement space can be saved, and space is provided for a second-axle lifting device.

Techniques for rescheduling one or more timing intervals associated with a channel of a communication system. Responsive to a detected change in a property of the channel, a rescheduling algorithm identifies a given one of the timing intervals, within a schedule for the channel, that violates a system requirement in view of the detected change. The algorithm determines if the interval can be rescheduled to accommodate the detected change and if so reschedules the interval. If the interval cannot be rescheduled to accommodate the detected change, the interval is removed from the schedule. The rescheduling process may be repeated for each of the intervals in the channel schedule. The intervals in an illustrative embodiment may include, for example, grants, polls, free intervals or initial-maintenance intervals (IMIs) of an upstream channel in a DOCSIS-compliant CATV system.

A lifting device for a transfer plate at the end of a printing machine, which includes a lifting plate, two cylinder units, a fixed support frame and a frame, the cylinder unit includes a fixed cylinder body and a moving piston rod, and one end of the fixed support frame It is fixedly connected with the fixed cylinder body, and the other end is fixedly connected with the frame; the lifting plate is fixed on the upper end surface of the piston rod. It cooperates with the lifting and steering device of the transfer board and the horizontal conveyor belt below the synchronous lowering station to complete the receiving, lowering, rotating 180° of the transfer board in sequence, then lowering and lowering, translation and lifting, and finally feeding In the synchronous lifting mechanism, the linear transition between the two ends of the printing machine is realized, and the entire line realizes continuous printing without intervals, which can reduce the footprint of the printing machine and improve the printing efficiency of the entire printing machine.

The invention relates to an optical switch device based on spiral optical fibers. The optical switch device is formed in the mode that the first spiral optical fiber, the second spiral optical fiber and an optical fiber coupling polarization analyzer is connected in sequence, wherein the first spiral optical fiber is completely same as the second spiral optical fiber. Each spiral optical fiber hasthree different refractive index intervals, wherein the first interval is a rotation-free interval, the second interval is a refractive index-variable interval, and the third interval is a uniform pitch interval. Linearly polarized light enters from the rotation-free interval of the first spiral optical fiber, and the elliptically polarized light exiting from the refractive index-variable interval of the first spiral optical fiber enters the refractive index-variable interval of the second spiral optical fiber, the linearly polarized light exiting from the rotation-free interval of the secondspiral optical fiber enters the optical fiber coupling polarization analyzer, and the output end of the optical fiber coupling polarization analyzer is taken as the final output end of the optical switch device. By means of the optical switch device, the disturbance of the outside environment can be overcome, such as the influence of temperature fluctuation and mechanical vibration on the all-optical switch performance. All parts of the optical switch are connected in a fiber splicing mode, so that the integration level of the system is high.

The invention relates to a fractal dimension calculating method based on a density peak clustering algorithm, and belongs to the field of signal processing. The fractal dimension calculating method comprises the following steps that S1, one-dimensional chaotic time series signals are obtained from practical engineering; S2, sampled time series data are subjected to pre-treatment to obtain an associative integral logarithmic set by using a k-d tree optimized GP algorithm; S3, second order difference is applied to obtained data, and zero fluctuation data are extracted by using the density peak clustering algorithm; S4, the interval of continuous natural numbers in the zero fluctuation data is selected to conduct statistical analysis, and effective zero fluctuation data are maintained; and S5, the reserved data are fitted by using the least square method, and the correlation dimension is calculated. A scale-free interval can be automatically recognized objectively and accurately, calculation results are more precise, the procedure is simple, achievement is easy, and great significance to nonlinear application is achieved.

Disclosed is a method for suppressing an inter-carrier interference and noise signal, and an orthogonal frequency division multiplexing receiver for performing the same. Here, a method for an orthogonal frequency division multiplex (OFDM) receiver to suppress an inter-carrier interference and noise signal by using a symbol interference free interval without inter-symbol interference (ISI) in a guard interval (GI) includes: performing a weighting operation between sample data of the symbol interference free interval and sample data of the effective symbol interval by using a signal-to-noise ratio (SNR) of the symbol interference free interval and an SNR of an effective symbol interval corresponding to the symbol interference free interval; and performing a fast Fourier transform (FFT) on FFT input data configured by including the weighting-operated sample data into the effective symbol interval.

The invention discloses a comprehensive testing device of a double-fed wind power generator set. The device comprises a power generator cabinet, a joint debugging control cabinet and a driving frequency conversion cabinet, wherein the joint debugging control cabinet and the driving frequency conversion cabinet are fixedly installed at the top of the power generator cabinet, a driving frequency converter is arranged in the driving frequency conversion cabinet, and the output end of the driving frequency converter is connected with a cable used for being connected with the wiring end of the stator side of a double-fed wind power generator; a debugging system PLC and a driving system PLC are installed in the joint debugging control cabinet, the debugging system PLC is in communication connection with a cabin PLC and a variable-pitch PLC, and the driving system PLC is in communication connection with the driving frequency converter; and a transformer used for power supply voltage reductionis further installed in the joint debugging control cabinet, and a cabinet door of the joint debugging control cabinet is further provided with a touch screen which facilitates command input and information display. The device is reasonable in design and complete in function, and can carry out static debugging and driving tests on the wind power generator set in a power-action-free interval, thetest efficiency is high, so that the generator set can be guaranteed to be safely and rapidly put into use.

The invention provides a steering wheel assembly which comprises a steering wheel, a steering wheel seat, a driver airbag system module and fixing portions. The steering wheel seat is arranged in the center of the steering wheel and supports the steering wheel; components of the driver airbag system module are mounted in the steel wheel seat at certain intervals, and the periphery of the driver airbag system is protruded to form sliding combining portions; and the fixing portions are slidably combined with the sliding combining portions and are positioned inside the steering wheel seat. The steering wheel assembly has the advantages that the driver airbag system can be prevented from drooping and swinging, free intervals of action of a loudspeaker are reserved and are smooth, and the quality of the steering wheel assembly is improved.

This invention discloses a method to report the environment monitoring information of the base depots. Joint the E1 interface of the transmission module in the environment monitoring equipments with the E1 interface of the base depots. Firstly the transmission module transforms the collected environment monitoring information of the base depots into E1 data format, and then reports them by E1 interface. The base depots bring the environment monitoring information into the free interval in the transmission link or the oam link, to report to the base depots controller. The base depots controller transmits the environment monitoring information to the maintenance depots to monitor and display.