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Feedback method of weight matrix and related device and system

The embodiment of the invention discloses a feedback method of a weight matrix and the related device and system so as to reduce the feedback overhead of beam forming. The method provided by the embodiment of the invention comprises the steps: (1) an STA sends the beam forming ability information of a terminal to an AP (access point), and the beam forming ability information comprises the beam forming based on a weight matrix set form supported by the terminal and a largest supported beam forming antenna number, (2) the terminal receives weight matrix set information fed back by the access point according to the beam forming ability information, and the weight matrix set information comprises a plurality of preset weight matrices and the ID numbers which carry out unique marking on each weight matrix, (3) the terminal carries out channel estimation according to data package sent by the access point to obtain an CSI, (4) the terminal selects weight matrices from the weight matrix set information respectively for each OFDM subcarrier according to the CSI obtained through estimation, and (5) the terminal feeds the ID number corresponding to the weight matrix selected for each OFDM subcarrier to the access point.
Owner:GLOBAL INNOVATION AGGREGATORS LLC

Multi-robot cooperative path planning method

The invention relates to the field of robot path planning and particularly relates to a multi-robot cooperative path planning method. A workpiece is provided, a main robot and a slave robot are defined, and the main information of the main robot and the slave information of the slave robot are acquired; the main robot adopts an active vision mode to acquire the information of the workpiece; according to the main information and the slave information, a robot model is built, and an environment model is built according to the workpiece information; according to the robot model and the environment model, the main robot determines the working tasks and the working paths of the main robot and the slave robot; and the main robot and the slave robot execute the working tasks according to the working paths. A three-dimensional object is intelligently identified through a binocular active vision system, which is not limited to features of the color and the shape and the like of the object. A sectional path planning technology is adopted, the path optimization efficiency is improved, a handshake collision avoidance problem in multi-robot superimposed motion can be solved, and dynamic adjustment of each joint and online optimization of the path during the multi-robot processing process can be realized.
Owner:SHANGHAI ELECTRICGROUP CORP

Method and system for bidirectionally transmitting message in MPLS (Multi-Protocol Label Switching) network

The invention discloses a method for bidirectionally transmitting a message in an MPLS (Multi-Protocol Label Switching) network, which mainly comprises the following steps of: establishing a P2MP (Point-to-Multipoint) LSP (Label Switching Path) with a forward path and a backward path between an Ingress PE node of the MPLS network and at least one Egress PE node, wherein the node through which the backward path passes is the same as that through which the forward path passes; when the Ingress PE node receives a message transmitted by a user side, transmitting the message to each Egress PE node along the forward path of the P2MP LSP; and when the Egress PE node receives the message transmitted by the user side, transmitting the message to the Ingress PE node along the backward path of the P2MP LSP. The invention further discloses a system for realizing bidirectional transmission of the message in the MPLS network. According to the invention, the management complexity of the LSP in the MPLS network can be greatly reduced; in addition, the method and the system can be applied to clock synchronization of IEEE (Institute of Electrical and Electronic Engineers) 1588v2; and on the premise of ensuring the clock precision, the number of intermediate transmission nodes by which the IEEE1588v2 can span between a main clock and a slave clock is not limited.
Owner:ZTE CORP

Intelligent building monitoring system based on Android and power carrier

The invention relates to an intelligent building monitoring system based on Android and power carrier. A power line serves as a medium to transmit data packets. The system comprises control ends, a concentrator and multiple terminals, wherein the control ends comprise a PC control end and a mobile phone control end; the PC control end and the concentrator are connected via a serial port line for transmitting data; the mobile phone control end and the concentrator are connected via a GSM network for transmitting data; and the concentrator and a lower-stage terminal are connected via the power line for transmitting data. Defects of strong noise interference, large signal attenuation, randomness, time variation and the like in the case of carrier communication of a low-voltage power line can be overcome. Power carrier wired communication and GSM wireless communication are combined, advantages are enhanced and disadvantages are avoided, advantages of each are made full use of, the communication range is expanded, interference is reduced, the PC end is used for monitoring, multiple aspects such as inner dynamic point monitoring, theft prevention, alarming, and temperature monitoring of the intelligent building are realized, and a regional intelligent building monitoring network is further developed into a wide-area intelligent building monitoring network.
Owner:YANGZHOU UNIV

Single carrier frequency-domain equalization method based on sub-block analysis

The present invention discloses a single carrier frequency-domain equalization method based on sub-block analysis mainly for solving the problems in the prior art that the hardware complexity is high, and the realization process is complicated. The single carrier frequency-domain equalization method based on sub-block analysis comprises the realization steps of 1, intercepting a fast Fourier transform (FFT) block of which the length is N from a reception terminal, and dividing the FFT block into a plurality of sub-blocks; 2, carrying out the N-point FFT on the intermediate channel response in the time quantum of the i-th sub-block; 3, calculating the coefficients of an equalizer to obtain the frequency-domain equalization data of the whole FFT block; 4, obtaining the time domain equalization data of the whole FFT block by the frequency-domain equalization data; 5, obtaining the time domain equalization data of the i-th sub-block; 6, splicing the time domain equalization data of the sub-blocks to obtain a final equalization result. According to the present invention, by carrying out the frequency domain equalization in the FFT block, the interblock interference does not need to be eliminated, thereby reducing the hardware complexity, and simplifying the equalization realization process. Moreover, the single carrier frequency-domain equalization method based on sub-block analysis has a better bit error rate performance than the prior art, and is suitable for the worse channel environments.
Owner:XIDIAN UNIV

Emergency DC control based inhibition method for power fluctuation peak of UHV (Ultra High Voltage) tieline

InactiveCN104485675ASolve the problem of too high power swing peakImprove transient power angle stabilityPower oscillations reduction/preventionStart timePower modulation
The invention discloses an inhibition method for power fluctuation peak of a tieline. The inhibition method is characterized in that the start time and the end time of emergency DC control and the emergent power modulation rate are set to realize inhibition for the power fluctuation peak of the tieline. The method comprises the steps of measuring the power fluctuation data of the tieline in real time; starting the emergency DC control in the case that the power value of the tieline exceeds a start threshold, and determining the corresponding emergency DC power modulation rate according to the power fluctuation slope of the tieline, so as to perform emergency DC control; ending the emergency DC control once the power of the tieline reaches the fluctuation peak, that is, zeroing the emergency DC power modulation quantity. The invention also discloses an inhibition method for the power fluctuation peak of the UHV tieline. With adoption of the method, the problem of excessively high power fluctuation peak of the UHV tieline caused by the transient power shock disturbance can be inhibited, and the transmission capacity of the UHV tieline and the transient stability of an inter-regional interconnection system can be effectively improved.
Owner:HUAZHONG UNIV OF SCI & TECH +2

Mounting structure of machine tool centre and centre shaft

The invention discloses a mounting structure of a machine tool centre and a centre shaft. A mounting portion on the right of the centre is sleeved into a mounting hole on the left of the centre shaft, the right of the centre is a Morse taper section, and the mounting hole on the left of the centre shaft is a Morse taper hole. A large-diameter section, a small-diameter section and a key tooth section are arranged in the middle of an axial body of the centre from left to right, key teeth are arranged on the external circular surface of the key tooth section, a check ring is sleeved in the middle of the centre, the right of an inner hole of the check ring is in clearance fit with the key tooth section of the centre, the left of the inner hole of the check ring I in clearance fit with the small-diameter section of the centre, key grooves are reserved at positions, corresponding to the key teeth on the key tooth section, on the left of the inner hole of the check ring, a stopper is formed between each two adjacent key grooves and clamped between the right end face of the small-diameter section and the corresponding key tooth on the key tooth section, a nut sleeve is sleeved outside the check ring, and the right of an inner hole of the nut sleeve is in threaded connection with the left of the external circular surface of the centre. The mounting structure is not only convenient for calibration of the centre but also capable of guaranteeing matching precision of the centre and the centre shaft, and is further convenient for mounting and demounting of the centre.
Owner:CHONGQING MACHINE TOOL GROUP

Automatic sorting method and system

The invention discloses an automatic sorting method and a system. The automatic sorting method and the system are used for automatic unloading of cargos on a transportation unit at an unloading stall.The automatic sorting method comprises following steps: cargo information of the transportation unit is obtained; based on the acquired cargo information, the information of a pre-set stall is searched so as to obtain target unloading stall information corresponding to the cargo information, and the target unloading stall information is sent to the transportation unit; wireless communication between the transportation unit and the unloading stall is carried out through controlling to obtain the target unloading stall information and address information of a plurality of unloading stalls; andan executing mechanism is controlled to realize automatic unloading of the cargos at the target unloading stall when the acquired target unloading stall information is consist to the address information of the unloading stalls. The automatic sorting method is capable of realizing independent calculation and unloading of each transportation unit based on receive information, the unloading instructions are generated independently and are controlled, so that unloading efficiency is increased greatly, and system damage rate is reduced.
Owner:杭州银弹科技有限公司

Quasi-one-dimensional cold atom source preparation device and method

The invention discloses a preparation device of a quasi-one-dimensional cold atom source. The quasi-one-dimensional cold atom source is prepared by mainly utilizing a diffuse reflection laser cooling atom technology; wherein the preparation device mainly comprises a vacuum cavity, an optical system and a cold atom density distribution measurement system. The outer surface of the vacuum cavity is covered with a transverse cylindrical quartz glass cavity which is made of a high-diffuse-reflection-rate material and is used for cooling laser required by atoms to be cooled; and the optical system mainly comprises cooling laser, re-pumping laser and detection laser; after the cooling laser and the re-pumping laser enter the vacuum cavity, an isotropic quasi-one-dimensional cooling light field is formed to carry out laser cooling on background atom gas in the isotropic quasi-one-dimensional cooling light field, and the detection laser carries out absorption method detection on cooled atoms. The cold atom density distribution measuring system mainly comprises a pair of movable Helmholtz coils, and the density distribution of cold atoms is measured by uniformly moving the coils along the detection direction. According to the invention, the preparation of the quasi-one-dimensional cold atom source with high optical thickness and uniform distribution is realized in the transverse vacuum cavity. Under the condition of a proper atom source and a proper laser system, quasi-one-dimensional alkali metal atoms such as lithium, sodium, potassium, rubidium and cesium and other atoms suitable for laser cooling, such as metastable inert gas atoms, can be cooled and stored.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

Multi-channel fluorescent PCR (Polymerase Chain Reaction) detection system and multi-channel fluorescent detection method

The invention discloses a multi-channel fluorescence PCR (polymerase chain reaction) detection system and a multi-channel fluorescence detection method, which are suitable for detecting a PCR reaction system added with various fluorophores, and the detection system comprises more than two fluorescence detection modules, each fluorescence detection module comprises a light source, a lens, a first optical filter, a dichroscope, a light emitting window, a second optical filter and an imaging module, and the fluorescence detection modules are configured to move to the positions, opposite to the PCR reaction system, of the respective light emitting windows one by one under the driving of external force so as to obtain a complete image of the PCR reaction system of a channel corresponding to the fluorophore; different fluorescence detection modules are adaptive to different types of fluorophores; and first optical filters/second optical filters/dichroscopes in different fluorescence detection modules correspond to different first wave band ranges/second wave band ranges/band pass ranges. According to the invention, a plurality of fluorescence detection modules are arranged, and signals of fluorescence channels of all reaction chambers of a PCR reaction system are sequentially acquired one by one.
Owner:翊新诊断技术(苏州)有限公司

A Method for Suppressing Power Swing Peak of UHV Tie Line Based on DC Emergency Control

InactiveCN104485675BSolve the problem of too high power swing peakImprove transient power angle stabilityPower oscillations reduction/preventionPower modulationStart time
The invention discloses an inhibition method for power fluctuation peak of a tieline. The inhibition method is characterized in that the start time and the end time of emergency DC control and the emergent power modulation rate are set to realize inhibition for the power fluctuation peak of the tieline. The method comprises the steps of measuring the power fluctuation data of the tieline in real time; starting the emergency DC control in the case that the power value of the tieline exceeds a start threshold, and determining the corresponding emergency DC power modulation rate according to the power fluctuation slope of the tieline, so as to perform emergency DC control; ending the emergency DC control once the power of the tieline reaches the fluctuation peak, that is, zeroing the emergency DC power modulation quantity. The invention also discloses an inhibition method for the power fluctuation peak of the UHV tieline. With adoption of the method, the problem of excessively high power fluctuation peak of the UHV tieline caused by the transient power shock disturbance can be inhibited, and the transmission capacity of the UHV tieline and the transient stability of an inter-regional interconnection system can be effectively improved.
Owner:HUAZHONG UNIV OF SCI & TECH +2

High-pressure phosphorous removal auxiliary device

The invention relates to the field of steel belt phosphorous removal equipment, in particular to a high-pressure phosphorous removal auxiliary device which comprises a phosphorous removing bin. Two vibrating rollers and two high-pressure removing devices close to the left end and the right end of the phosphorous removing bin are arranged in the phosphorous removing bin. Pressing roller sets are arranged on the two sides of each vibrating roller correspondingly. Abrasive cleaning rollers are arranged between two close pressing roller sets, and beside one pressing roller set close to the outlet end of the phosphorous removing bin. Each vibrating roller comprises an upper beam frame, a transferring cylinder, a planetary hollow roller and a variable frequency motor, wherein the top end of the upper beam frame is connected to the upper portion in the phosphorous removing bin in a shaft manner, the transferring cylinder is horizontally hinged into the free end of the upper beam frame, the planetary hollow roller is connected into the transferring cylinder in a shaft manner, at least one third portion of the outer side face of the planetary hollow roller is matched with the inner wall of the transferring cylinder in a friction manner, the variable frequency motor is arranged outside the transferring cylinder and connected with the planetary hollow roller in a transmission manner, and one supporting beam plate is arranged below each transferring cylinder. The high-pressure phosphorous removal auxiliary device can reduce the use cost of steel belt phosphorous removal substantially.
Owner:GUANGZHOU SITIAN AUTOMOBILE SUPPLIES CO LTD
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