280 results about "Level number" patented technology

The invention provides a mobile phone near field communication system and method based on visible light. The mobile phone near field communication system and method based on the visible light are used for short distance wireless communication. According to the mobile phone near field communication system, a transmitting terminal is arranged on a mobile device provided with a light-emitting screen and a light sensor, and comprises an encoding module and a rate adaptive mechanism module; a receiving terminal is provided with an LED and comprises a light sensor array, a signal conditioning module, a decoding module and a feedback module. The encoding module encodes data into a brightness level sequence and sends the brightness level sequence out through light signals; the receiving terminal collects the light signals to conduct signal conditioning and decoding so as to obtain decoded data; the feedback module is used for feeding back a signal of data blocks which need retransmission and a signal of adjustment of brightness level numbers to the transmitting terminal; the transmitting terminal controls the retransmission of the data blocks and the adjustment of the brightness level numbers through the rate adaptive mechanism module. The mobile phone near field communication system and method based on the visible light are low in cost, easy to use, safer, free of addition of extra hardware, and capable of achieving the near field communication functions such as mobile payment, equipment matching and data exchange between mobile phones.

The invention belongs to the power transmission and distribution field, and specifically relates to a pulse width control method of a modular multilevel converter. The method is characterized by determining the switched number of submodules at any time by carrier phase-shifting and then determining switching of the specific submodules by capacitance-voltage balance control, and comprising the steps of carrier comparison, signal acquisition, signal processing, PWM pulse signal generation and the like. The pulse width control method is simple, scientific and reasonable and easy for engineering realization, and has good dynamic property, thus being applicable to occasions with wider range of frequency variation in an AC system and free from restriction of the level number.

A variable-length binary string is utilized to encode node identifiers in a tree for an XML document object model. A general prefix encoding scheme is followed; a node identifier is generated by the concatenation of encodings at each level of a tree along a path from a root node to another particular node. Arbitrary insertions are supported without change to existing node identifier encodings. In addition, the method provides for document order when unsigned binary string comparison is used to compare encoded node identifiers. In support of sub-document concurrency control, prefix encoding provides a way to derive ancestor-descendant relationships among nodes in a tree. Lastly, the encoding method provides a natural pre-order clustering sequence, also known as depth-first clustering. If a prefix is applied to an encoding with a level number, starting with zero at the root, width-first clustering will result. A mixed clustering can also be supported.

The invention discloses an uplink access method for distribution of lead codes for distinguishing the user priority in a TD-LTE / TD-LTE-A system. The unlink access method is a random access method for achieving different QoS services. The uplink access method includes the steps of (1) a lead code generation sorting stage; (2) a lead code distribution stage, wherein the lead codes are divided into the exclusive lead codes and the competitive lead codes for the first time; during secondary division, the competitive lead codes are divided into n groups according to the user group level number n, G1, G2, ...Gn-1 groups are the priority lead code groups and are used for backoff access of user groups corresponding to the priority lead code groups, and the Gn group is used for public access; an eNB enables the distribution scheme to be notified to all terminals in a broadcasting mode; (3) a random access stage, UE selects the front codes according to broadcast information to have access, a window does not receive any response in the waiting time, collision exists in the access, the terminals back off according to rules and reaccess is performed, and access fails when the maximum access time is exceeded. In random access based on competition, low delay and high throughout of high priority access can be guaranteed, and the requirements for different QoS services of the TD-LTE / TD-LTE-A system are met.

The invention discloses a module combined multi-level converter, and belongs to the technical field of multi-level conversion. Three-phase alternating current wire connecting terminals of a first power unit (U1) are connected in series with n third power units (U3) (n is a positive integer, same below) in turn to form a three-phase upper bridge arm, three-phase alternating current wire connecting terminals of a second power unit (U2) are connected in series with n fourth power units (U4) in turn to form a three-phase lower bridge arm, the three-phase upper bridge arm is connected with the three-phase lower bridge arm through two electric reactors, and a connecting point between the two electric reactors is a three-phase alternating current output end. A direct current wire connecting terminal of the first power unit (U1) is connected with an anode (101) of a direct current bus, and a direct current wire connecting terminal of the second power unit (U2) is connected with a cathode (102) of the direct current bus. By increasing or reducing the number n of the power units of the upper bridge arm and the lower bridge arm, the level number of the converter can be changed. The module combined multi-level converter preserves the advantages of the conventional multi-level converter, overcomes the defects of the conventional multi-level converter, and can be applied to an energy conversion system of medium-high voltage high-power occasions.

The invention discloses a traffic condition prediction system fused with various transport data and a method. The traffic condition prediction system comprises a flow level detecting unit, a speed level detecting unit, a flow trafficability ratio level detecting unit, a flow occupancy level detecting unit, a speed occupancy level detecting unit, a saturation coefficient level detecting unit, a historical road level detecting unit and a road condition predicting unit, level numbers of parameters are obtained by the various level detecting units by means of measuring and computing, then the level numbers are multiplied by percentages of level numbers of the parameters preset in the road condition predicting unit, the sum of the products is computed to obtain road condition level numbers, and a road condition within future prediction time is obtained according to a road condition corresponding to preset road condition level numbers. The technical problem that a future road condition is predicted by means of combining a single road condition characteristic parameter with a historical road condition in the prior art. The traffic condition prediction system and the method are fused with various information of a current road condition.

The invention relates to a modulation strategy for a modular multilevel transducer. The modulation strategy is characterized in that the switching statuses of submodules are determined on the basis of a carrier disposition method in combination with the current directions of bridge arms and the sequence of capacitor voltage of the submodules. The invention has the benefits as follows: each phase only needs one modulating wave and N carrier waves (N is the number of the submodules of the upper or lower bridge arm of each phase of the modular multilevel transducer), the modular multilevel transducer is enabled to output N+1 levels without the need of a carrier phase-shifting, the precision of a control algorithm is high, engineering realization is facilitated, and software and hardware resources are saved; that N submodules are invested in each phase can be guaranteed at any time, and voltage balance control of capacitor voltage of the submodules can be realized without the need of closed-loop control; and meanwhile, the voltage and power classes of the modular multilevel transducer are convenient to adjust, without limitation of level number.

The invention relates to the technical field of internet information processing, in particular to an associated data visualization display method. The method comprises: abstracting associated information of target information into sub-nodes of a corresponding level number, and adding directed edges among the nodes according to pointing relationships among the associated information; and constructing an associative relationship map with the directed edges among the nodes taking the target information as a starting point by using a visualization tool. According to the method, other information associated with the target information can be analyzed from massive associated information data, and an associative mode between an associative path and the nodes is visually displayed by adding the corresponding directed edges among the nodes; and the path is clear, visual and easy to understand, so that the manpower and time costs of users in related data arrangement and analysis are greatly reduced, a reference basis is provided for target information background analysis and mining and related question analysis and tracking, and the method has wide application prospects in the fields of information mining and information processing.

The invention discloses a full-bridge module and half-bridge module-based mixed multi-level converter, which comprises three phase units; the three phase units are connected between an anode direct current bus and a cathode direct current bus; each phase unit is formed by an upper bridge arm and a lower bridge arm; each bridge arm comprises N half-bridge modules and one full-bridge module with a direct current power supply; the N half-bridge modules and the full-bridge module with the direct current power supply are serially connected and N is a positive integer. The invention also discloses a control method of the full-bridge module and half-bridge module-based mixed multi-level converter. According to the full-bridge module and half-bridge module-based mixed multi-level converter and the control method thereof, higher output level number is realized by fewer half-bridge modules as far as possible, when the voltage of the half-bridge modules is subjected to sorting algorithm, the time used by computation is less, the efficiency is higher, the module put-into-use speed is faster and the fluctuation of voltage and capacitance is reduced.

The invention discloses a mixed clamping back-to-back multi-level AC-DC-AC switching circuit. The mixed clamping back-to-back multi-level AC-DC-AC switching circuit comprises two groups of multi-level switching circuits and a direct current bus capacitor link connected with the two groups of multi-level switching circuits; and the level number of the direct current bus capacitor link is more than or equal to 4. By the mixed clamping back-to-back multi-level AC-DC-AC switching circuit, the dynamic self-balance between all direct current bus capacitors and clamping capacitors can be realized and equal capacitor voltage can be obtained so that the champing capacitors and the direct current bus capacitors complete multi-level boost output and a good condition for the expansion of the capacitance of direct current bus capacitors is created at the same time. The mixed clamping back-to-back multi-level AC-DC-AC switching circuit bears a high-power high-voltage load on the premise of guaranteeing system reliability and good harmonic output characteristics, is flexible in control, quite low in loss, has efficient performance, can realize bidirectional flow and mutual control compensation of reactive power and active power, and is very suitable for alternating current speed regulation or a power grid interconnection technique of different distributed power generating systems.

A system and method of processing a component color image signal extracted from image signals are disclosed, including a quantizing unit for quantizing the component color image signal over a plurality of quantization regions of the component color image signal, such that the color difference per unit error caused by quantization of the component color image signal in each of the plurality of quantization regions is within a predetermined value. This quantizing unit operates also to quantize the component color image signal under a quantization level number different for each of regions specified by the value of the component color image signal, as a threshold, corresponding to either the polarity change or the maximum of the component color image signal.

The invention discloses a proficiency testing sample for measuring the color fastness to perspiration of a textile and a preparation method of the sample. The proficiency testing sample is formed by dyeing a piece of pure cotton weaving tabby bleaching grey cloth by adopting an active dye or a direct dye, the detection result of the color fastness to acidic perspiration (which comprises an original sample discoloration level number, a cotton lining staining level number and a wool lining staining level number) is within 2 level-5 level and contains the daily detection range of the color fastness to acidic perspiration in the field of existing textile clothing, and the proficiency assessment of the detection items of different laboratories or the quality control usage of the laboratories can be realized. The preparation method of the proficiency testing sample has the advantages of easiness and convenience for operation, high success rate and high practicability; the prepared proficiency testing sample can be stored and transported at normal temperature and meets the uniformity and stability assessment guide requirement of a CNAS0GL03 proficiency testing sample in the aspects of uniformity and stability.

The invention provides a cascade type time-interval variable-order multi-level static converter, which can be modularized; a previous-stage four-way isolation DC-DC (Direct-Current-Direct-Current) converter (1) is connected to a subsequent-stage four-unit cascade inverter (2); a novel time-interval variable-order multi-level control circuit (3) is connected between the previous stage and the subsequent stage; the converter is characterized in that the previous stage is adopted with four ways of mutually independent, staggered and parallel double-tube forward direct-current converters; the subsequent stage is a cascade structure composed of four single-phase H bridges; a carrier phase-shifting frequency-doubling SPWM (Sinusoidal Pulse Width Modulation) technology is adopted; the time-interval variable-order multi-level control circuit is connected between the previous stage and the subsequent stage; the previous stage of the static converter is beneficial to reducing input current ripple and reducing the volume of a filter; the subsequent stage is low in voltage stress of a power switch device, high in circuit modularization degree and low in loss; and, by means of the time-interval variable-order multi-level control circuit, on the premise of not increasing the number of independent sources of the previous stage, the more level number of output can be realized, and the THD (Total Harmonic Distortion) of the harmonic wave is low.

A method having application for the development of oil reservoirs for automatically extracting from a seismic image pertinent information for sedimentologic interpretation by using estimations of realistic chronological scenarios of sedimentary layers deposition. The method includes iterative estimation of a first and of a second chronological scenario of the deposition of sedimentary layers, assuming that each reflector settles at the earliest and at the latest possible moment during the sedimentary depositional process. A chronological level number is assigned to a group of initial reflectors. Then a chronological level number is incremented by one and decremented by one which numbers are assigned to the reflectors including pixels located above and respectively below the initial reflectors and above and respectively below no other reflector. An interpretation of these two chronological scenarios is eventually carried out so as to reconstruct the depositional conditions of the sedimentary layers.

The invention discloses a novel process of regenerating base oil from waste lubricating oil. The process which applies an advanced molecular distillation technology to regenerate base oil from waste lubricating oil can not only regenerate better base oil, but also carry out effluent fraction through multilevel series connections. The waste lubricating oil is deprived of light diesel oil in a rectification tower through pretreatment and deprivation of light components, and then the waste lubricating oil is pumped into a first-level molecular still through a first-level feed pump to distill off a relatively lighter base oil component as a product. Heavier components which are left by the first-level distillation and serves as the raw material of a second-level molecular still are pumped into the second-level molecular still through a second-level feed pump to distill off a component heavier than the first-level molecular distillation product to serve as a product, and the distillation residuals are taken as the raw material of a third-level distillation. The process is repeated in the manner until a required n level is reached, wherein n is more than or equal to 2 and is less than or equal to 5, and the recommended optimal level number is 3 or 2. The process has the advantages that: the obtained product only contains the base oil component, while other impurities including additives are discharged in the form of residuals; the process also can produce a plurality of products with good quality and varied viscosities, thereby bringing about great convenience for the preparation of product lubricating oil.

In digital communications, a multi-mode block-coded modulation / demodulation method carries out adaptive one-way transmission of a multi-mode digital signal by using, between at least two different modes, different settings for level number, level code, set-partitioning method and modulation method that are component elements of a multi-level block-coded modulation system.

A wireless transmission apparatus in which degradation of error-rate characteristics can be avoided without decreasing a data rate in the mobile communication using a pre-coding together with a FDE. In this apparatus, a modulation unit (102) modulates a first data among transmission data with a first modulation method and generates a first symbol string, a modulation unit (103) modulates a second data among the transmission data with a second modulation method whose modulation multi-level number is larger than that of the first modulation method and generates a second symbol string, and a reproduction unit (104) reproduces the second symbol string and obtains a plurality of second symbol strings. An arrangement unit (105) arranges the plurality of the second symbol strings to both sides of the first symbol string and a pre-coding unit (106) performs a pre-coding to each symbol string after arrangement.

The invention discloses an optically controlled optical PAM signal regeneration device comprising a power adapting unit, an optical clock control unit and a PAM reshaping unit, wherein the PAM reshaping unit is the core of a regenerator and is composed of a Mach-Zehnder interferometer MZI and a highly nonlinear fiber ring NOLM, for a to-be-regenerated degraded optical PAM signal, the level matching between the input degraded optical PAM signal and the PAM reshaping unit is accomplished by the power adapting unit, the optical clock signal power and the delay output by the optical clock control unit and a phase shifter in the MZI structure are adjusted, so that the PAM reshaping unit works normally, the loss coefficient, the optical fiber length, the nonlinear coefficient and other parameters of a highly nonlinear optical fiber in the NOLM structure, and the coupling coefficients of front and back couplers in the MZI structure are changed to design PAM reshaping units with different level numbers, and then the regeneration of the degraded optical PAM signal is accomplished. Therefore, the optically controlled optical PAM signal regeneration device disclosed by the invention can execute a reshaping and a re-timing function and has the advantages of flexible design of regeneration level numbers.

The invention provides a PLL (phase-locked loop) locking state detection circuit structure, comprising a filtering circuit, a self-resetting sampling circuit, a comparison circuit and a state locking circuit, wherein the value of a trigger chain level number n of the self-resetting sampling circuit is determined according to specific PLL design indexes; the clock input ends of two trigger chains of the self-resetting sampling circuit are respectively controlled by a PLL feedback frequency and a frequency-monitoring phase discriminator output frequency, so that the judgment on the PLL input reference frequency and feedback frequency state is realized, meanwhile the determined output signal is connected with the input end of the comparison circuit, and the determination and sampling on the determination result are realized by utilization of the comparison circuit; the state locking circuit generates two types of locking signals consisting of a variable state locking signal and a constant state locking signal according to the output signal of the comparison circuit; the detection on the PLL locking state is finished. According to the PLL locking state detection circuit structure, the circuit structure is simple and flexible, and two types of locking signals consisting of the variable locking signal and the constant locking signal can be output according to different application requirements.

The invention discloses a method for carrying out change detection on remote sensing images based on treelet fusion and level set segmentation, and mainly solves the problem that much pseudo-change information exists in the existing change detection methods. The method is implemented through the following steps: inputting two time-phase remote sensing images, then respectively carrying out mean shift filtering on each image so as to obtain two time-phase filtered images; respectively carrying out two-dimensional stationary wavelet decomposition on the two time-phase filtered images three times under different level numbers; carrying out subtraction on wavelet coefficient matrixes of corresponding directional son-bands of the filtered images with the same decomposition level number; carrying out enhancement and two-dimensional wavelet inverse transformation reconstruction on wavelet coefficient difference matrixes in horizontal and vertical directions by using a sobel operator; and fusing the reconstruction images with different decomposition level numbers so as to obtain a final difference map by using a treelet algorithm, then carrying out level set segmentation on the differencemap so as to obtain a change detection result. By using the method disclosed by the invention, the accuracy of the change detection result can be improved effectively, and the edge feature of a change area can be maintained better, therefore, the method can be applied to the fields of natural disaster analysis, land resource monitoring, and the like.

Adaptive modulation / demodulation method in a radio communication system is provided. A modulation multi-level number in a transmission device and a demodulation multi-level number in a reception device are judged independently from each other according to a propagation condition and communication is performed by controlling the likelihood when the multi-level numbers of the transmission side and the reception side are different. The reception device can perform operation by controlling likelihood information on lower bit of the multi-level modulation even when the modulation multi-level number and the demodulation multi-level number used at the transmission side are different. Moreover, the transmission device and the reception device independently decide the modulation multi-level number and the demodulation multi-level number, thereby following an instantaneous propagation fluctuation and improving the throughput.

A memory system includes a non-volatile semiconductor memory that includes a plurality of blocks, each of the blocks being a data erasing unit; an erasing time monitoring unit that monitors time required for erasing data from the non-volatile semiconductor memory; a management table for managing the erasing time on a unit of each of the blocks; and a wear-leveling control unit that levels number of rewriting across the blocks based on the management table. The memory system accommodates variations among lots, individual pieces, and blocks, thereby performing highly-accurate wear leveling.

The invention discloses a dual constraint based selection calling method of an LOD (Level of Detail) model in a three-dimensional scene. The dual constraint based selection calling method comprises entering into the three-dimensional scene; obtaining a viewpoint coordinate of a user and a center coordinate of the current object in the three-dimensional scene; calculating the sight distance and judging whether the current object is within the field of view of the user or not; calculating the interest degree of the user of a three-dimensional model and calling the user required level number of the current object model; combining with the distance constraint condition to select to call the user required LOD model of the current object; rendering and drawing the selected model; judging whether objects in the three-dimensional scene are traversed or not. According to the dual constraint based selection calling method of the LOD model in the three-dimensional scene, the LOD model can be selected to be called based on the interest degree and the distance, the requirements for the high image quality of the high interest degree of object of the user are met, meanwhile the weakening treatment is performed on the low interest degree of object of the user, and the rendering speed of a system is improved under the condition that the basic visual demand of the user is satisfied.

The invention relates to a modular multilevel converter level number multiplication method and a starting method. According to the control method, when redundancy control is not considered, what a user needs to do is to control at least three sub-modules of each bridge arm to be one half of a rated module capacitor voltage (module voltage for short), so that the level number double effect can be realized by outputting output one half of the sub-module voltages. The half-voltage sub-module (HVSM) set participates in the voltage balancing control of full-voltage sub-modules (FVSM), and at the same time, voltage balancing is performed in the half-voltage sub-modules to maintain the voltage stability of the two kinds of sub-modules. The method is easy to implement, the topology and the modulation strategy do not need to be changed, and the control and the voltage balancing effect of the full-voltage sub-modules will not be influenced. Under the control of the method, the level number of the converter of N sub-modules of a single bridge arm can be improved from (N+1) levels to (2N-2) levels, and the level number is nearly doubled.

The invention provides a processing method and a system for image fusion. The processing method comprises the following steps: converting a multispectral image from an RGB colour space to an HIS colour space to obtain a hue (H) component, a saturation (S) component and an illumination (I) component; acquiring level number for analyzing the full color wave band image through an analysis wave based on the spatial resolution ratio of the filter type, the full color wave band image and the multispectral image; analyzing the full color wave band image and acquiring high frequency information and low frequency information corresponding to the level number according to the acquired level number; performing fusion on the acquired high frequency information corresponding to the level number and an I component image according to the preset strategy, so as to acquire an I' component fusion image; performing fusion on the S component, the H component and the acquired I' component, performing conversion to the RGB colour space, and acquiring the targeted multispectral image. Through the technical scheme of the invention, the acquired targeted multispectral image is high in space resolution and spectral resolution.

A power circuit, a converter structure and a wind power generation system thereof are disclosed. The power circuit includes a first converter having an AC input side and a DC output side, a second converter having a DC input side and an AC output side, and a DC bus storage unit electrically connected to the DC output side of the first converter and the DC input side of the second converter. A level number, a switching valve type and / or a circuit connection of the first converter are different from those of the second converter.

The invention discloses an active steering automotive train which comprises a tractor and a multi-level full trailer and is characterized in that the tractor is connected to a first-level full trailer through a first-level active steering device; the first-level full trailer is connected to a second-level full trailer through a second-level active steering device; an n-1 level full trailer is connected to an n-level full trailer through an n-level active steering device; each level active steering device is connected to a controller corresponding to a level number; and a latter level controller adjusts the action of the active steering device according to real-time running data of a previous trailer, thereby causing the motion track of the latter trailer to follow the motion track of the previous trailer. The invention also discloses a control method based on such a structure. The active steering automotive train and the control method have the beneficial effects that the capability of the full trailer to follow a previous level full trailer is promoted, thereby promoting the driving stability of the full trailer, being capable of towing more full trailers by the tractor and promoting the transportation efficiency of road.

The invention discloses an overmodulation method implemented based on a carrier. The method includes determining a three-phase original modulated wave U1i according to amplitude and phase of a reference vector in an overmodulation area; superposing a zero-sequence component V0 to the original modulated wave to acquire corresponding three-phase saddle modulated waves U2i, and sorting the three-phase saddle modulated waves U2i; in the overmodulation area, judging whether or not the reference vector is positioned in a linear modulation section, a hexagonal modulation section or a six-pulse wave modulation section according to the magnitude relationship between Umax and 2-|Umid|; correcting the three-phase saddle modulated waves in different modulation sections respectively to acquire a final three-phase modulated wave Ui; comparing the Ui with the triangular carrier to generate PWM (pulse-width modulation) waves, and distributing the PWM waves to corresponding pins. The overmodulation method has the advantages that sector division and vector action time calculation are not needed, so that the overmodulation method is simple to implement, easy to apply to engineering and applicable to overmodulation of any level number converters; accuracy of the overmodulation method is proved by simulation results.

A method having application for the development of oil reservoirs for automatically extracting from a seismic image pertinent information for sedimentologic interpretation in order to reconstruct the depositional conditions under which sedimentary layers have formed, by means of estimations of realistic chronological scenarios of sedimentary layers deposition. The method comprises iterative estimation of a first and of a second chronological scenario of the deposition of sedimentary layers, assuming that each reflector settles at the earliest, respectively at the latest possible moment during the sedimentary depositional process. A chronological level number is assigned to a group of initial reflectors. Then a chronological level number incremented by one, respectively decremented by one, is assigned to the reflectors made up from pixels located above, respectively below the initial reflectors and above, respectively below no other reflector. An interpretation of these two chronological scenarios is eventually carried out so as to reconstruct the depositional conditions of the sedimentary layers.

The invention provides an erasing / programming method and device of memory, so as to solve the problems of low erasing / programming speed of a conventional memory. The method comprises the steps of carrying out erasing / programming operation and erasing / programming verification on a memory cell successively; if the erasing / programming verification is not passed, continuing a cyclic operation of erasing / programming erasing / programming verification; when a cumulative number of erasing / programming reaches a preset n-th level number and the erasing / programming verification is not passed, adjusting the intensity of erasing / programming according to the strength of the n-th level and continuing the cyclic operations of the erasing / programming and erasing / programming verification; and jumping out the cyclic when the erasing / programming verification passes or the cumulative number of erasing / programming reaches a preset maximum number. The number for erasing / programming pulse is reduced and speed for erasing / programming is greatly increased by adjusting the intensity of the erasing / programming pulse during the cyclic process of erasing / programming.