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34 results about "Schedule Frequency" patented technology
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A regimen for an intervention which consists of a specified number of instances within a specific time period.
Base station, radio terminal and radio communication method
InactiveUS20070230397A1Measure communication qualityRadio/inductive link selection arrangementsWireless commuication servicesCommunication qualitySchedule Frequency
According to an aspect of the present invention, there is provided with a base station which communicates with radio terminals through time frames for transmission by using a plurality of frequency channels, including: a reception section configured to receive communication quality information indicating communication quality of one or more frequency channels from each the radio terminal; a scheduling section configured to schedule frequency channels to be assigned to the respective radio terminals based on the communication quality information received from the respective radio terminals; a signal generation section configured to generate assignment status signals indicating whether or not respective frequency channels are already assigned in a second time frame next to a first time frame; and a reporting section configured to report the assignment status signals for the frequency channels to each the radio terminal through the first time frame
Owner:KK TOSHIBA
Uplink transmission method and device
ActiveCN105898872AAccurate transmissionTransmission path divisionSignal allocationUplink transmissionControl channel
The invention provides an uplink transmission method and device, wherein the uplink transmission method comprises the steps of: receiving a first downlink control channel, wherein the first downlink control channel is used for carrying scheduling information of a first uplink sharing channel and determining a first frequency domain resource used for transmitting the first uplink sharing channel according to the scheduling information carried by the first downlink control channel; based on the first frequency domain resource and a frequency domain basic unit, generating a pilot frequency of the first uplink sharing channel; and transmitting the first uplink sharing channel and the pilot frequency on the first frequency domain resource. According to the scheme provided by the invention, DMRSs are generated on the scheduled frequency domain resource in a segmented manner according to frequency domain basic units, so that in each frequency domain basic unit, orthogonality of DMRSs of different UL(uplink) TTIs is ensured, and the accurate transmission and demodulation of uplink data are further ensured.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Scheduling information transmission method and device
ActiveCN109152072ASimple technical implementationSimplify complexityWireless communicationTime domainInformation transmission
The present invention discloses a scheduling information transmission method and device. According to the scheduling information transmission method and device, a network device determines the quantity of the scheduling information of a terminal; scheduling frequency resources are adopted to send the scheduling information according to the determined quantity of the scheduling information; the scheduling information is located on a physical downlink control channel and is used to indicate the data channel resources of scheduled frequency resources on the scheduling frequency resources; the scheduling information is DCI or an information domain in the DCI; the quantity of the scheduling information is smaller than or equal to the maximum value of a scheduling information quantity, or is determined according to the time domain unit length of the scheduled frequency resources and the time domain unit length of the scheduling frequency resources, or determined according to the subcarrier spacing of the scheduled frequency resources, the subcarrier spacing of the scheduling frequency resource and a first preset value, or is determined according to the time unit length of the scheduled frequency resources, the time unit length of the scheduling frequency resources and the first preset value, wherein the first preset value is used to determine the numbers of the schedulable maximum time domain units of the scheduling information. With the scheduling information transmission method and device of the invention adopted, the complexity of frequency resource scheduling can be decreased.
Owner:HUAWEI TECH CO LTD
Plane display device
InactiveCN1992091AHeight adjustableAdjustable angleMachine supportsInstrument housingDisplay deviceDrive motor
The invention discloses a plan display device that comprises: body which forms the appearance; bracket which is adhered to back of the said body; duplicate gear which is mounted on said bracket and can rotate; drive motor which is mounted on back of said body and make said duplicate gear rotate; track part which is connected with said bracket and shifts relatively to said bracket; besides, the invention also provides a plan display device which includes control part which is mounted on said body of said plan display device and electric connected with said drive motor; signal transmitting part which sends scheduled frequency signal that permits said drive motor to start to said control part. The invention can adjust the height and angle of the plan display device; it is operated by report controller, so it possesses effect of easy to operate.
Owner:LG ELECTRONICS(NANJING) PLASMA CO LTD
Method, device and system for transmitting communication signals
ActiveCN102098071AIncrease the number of channelsImprove reception performanceModulated-carrier systemsRadio frequency signalSchedule Frequency
The embodiment of the invention discloses a method, device and system for transmitting communication signals, relating to the communication field and strengthening network receiving performance. In the method, a multi-frequency receiver is used for carrying out frequency band division on radio-frequency signals received by an antenna so as to obtain radio-frequency signals with different frequency bands; a first part of radio-frequency signals in a scheduled frequency band are sent to a radio-frequency unit, so that the radio-frequency unit is used for converting the received first part of radio-frequency signals in the scheduled frequency band into first baseband digital signals which are sent to a baseband processing unit, wherein the first part of radio-frequency signals are received by the radio-frequency unit; and the radio-frequency unit is used for converting a second part of radio-frequency signals in the scheduled frequency band into second baseband digital signals which are sent to the baseband processing unit by a digital baseband interface, or the second baseband digital signals are sent to a first radio-frequency module by the digital baseband interface, so that the first radio-frequency module is used for sending the second baseband digital signals to the baseband processing unit. The method, device and system provided by the embodiment are mainly applied to a multi-frequency receiving process.
Owner:HUAWEI TECH CO LTD
Method for scheduling frequency channels
ActiveUS9301303B2Interference minimizationMitigate such drawbackFrequency-division multiplexWireless commuication servicesCarrier signalBroadband
The invention concerns a method for scheduling frequency channels implemented in a device for a narrowband radiocommunication system sharing with a broadband radiocommunication system, each comprising a narrowband base station and a broadband base station, and the same frequency band, the frequency band being in part divided into a given number of frequency blocks, each comprising a given number of carrier frequencies to optionally be allocated to the narrowband base stations. The device comprises a means for associating carrier frequencies with the narrowband base stations and a means for distributing over the frequency band the carrier frequencies associated with the narrowband base stations such that each frequency block comprises at least two distinct groups of carrier frequencies, each associated with a different base station, the two groups of carrier frequencies being selected according to a distribution rule such that interference relating to the emission of the base stations associated with groups of carrier frequencies distributed in the same frequency block have a minimum interfered surface area.
Owner:CASSIDIAN SAS
Task scheduling method, device, electronic device and storage medium
ActiveCN109144696ASolve the problem of unbalanced task schedulingSolve the problem of unbalanced schedulingProgram initiation/switchingSchedule FrequencyOperating system
The embodiment of the invention discloses a task scheduling method, a device, an electronic device and a storage medium. The method comprises the following steps: traversing the tasks in the current queue to obtain the current state information of the traversed tasks and the current values of frequency parameters; according to the current state information of each task and the current value of thefrequency parameter, selecting the task whose current state information is the least scheduled frequency among the tasks that can be executed as the target task; the selected target task being executed and the current value of the frequency parameter corresponding to the target task being updated after the target task is executed. By introducing frequency parameters to determine target tasks, theproblem of unbalanced task scheduling in the prior art is solved, and the stability of the task scheduling process is improved.
Owner:APOLLO INTELLIGENT DRIVING (BEIJING) TECHNOLOGY CO LTD
Method and system for coordinating and scheduling frequency band resources in cellular network
InactiveCN102104964AImprove performanceImprove effectivenessWireless communicationIntermediate frequencySchedule Frequency
The invention discloses a method and system for coordinating and scheduling frequency band resources in a cellular network. The method comprises the following steps of: classifying user terminals into UE-CO (User Terminals to be Coordinated) and UE-NCO (User Terminals not to be Coordinated) according to the quality of a channel; dividing frequency band resources into a plurality of equal frequency bands, and determining the starting point of each frequency band; measuring the average value of receiving power RSRP (Reference Signal Receiving Power) of each sector in the periphery by using the UE-CO, determining the maximum interference source, and allocating the frequency band resources according to the maximum interference source; assuming that the maximum interference source of the UE-COis eliminated, and calculating the rate gain value delta C increased by a user by a base station accessed to a cell; and when the rate gain value delta C is greater than a preset threshold, sending arequest for coordinating interference to the base station in which the maximum interference source isby using the UE-CO, and simultaneously reporting the quantized delta C'. The invention can increase the throughput of users in the edges of a cell and the total throughput of the system by less data exchange, and is helpful for improving the effectivity and the justification of the system.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Active control method and system of new-energy power plant
ActiveCN106684931AGive full play to the ability of frequency modulationShort response timeSingle network parallel feeding arrangementsControl systemNew energy
The invention relates to an active control method and system of a new-energy power plant. The method includes: receiving an active power instruction accessing a power grid, and determining the active power basic value and compensation value of the power plant; adding the basic value to the compensation value to obtain the active power comprehensive value of the power plant; determining the active power actual set value of the power plant according to the comprehensive value; distributing the actual set value to each power generating unit of the power plant. The system comprises a basic value and compensation value calculation module, a comprehensive value calculation module, a set value calculation module and a set value distribution module and is used for implementing the method. The active control method and system has the advantages that the active power actual set value of the power plant is determined according to the received power grid scheduled frequency modulation instruction and the current generable active power upper limit of the power plant, the active power actual set value is distributed to each power generating unit of the power plant, and the self-frequency modulation ability of the power plant is brought into full play; fast response is achieved, and frequency modulation precision is increased greatly.
Owner:SHENZHEN HOPEWIND ELECTRIC CO LTD
Dual-mode system, frequency spectrum scheduling baseband unit and interference elimination method
InactiveCN102340782AImprove spectrum utilizationBalance loadNetwork planningFrequency spectrumResource utilization
Owner:ZTE CORP
River and lake sand collecting detecting instrument and river and lake sand collecting detection method
The invention discloses a river and lake sand collecting detecting instrument and a river and lake sand collecting detection method. The method comprises the following steps of: selecting the corresponding length according to the water depth of a probe point, enabling the tail end of the connecting rod to pass through an opening of a core penetrating hammer so as to successively connect with a hammer pad, a touch detecting rod and a probe, vertically inserting a rod body which composed of the parts into water, and enabling the maximum skewness not to be more than a threshold value; hammering the hammer pad according to a scheduled frequency by utilizing the core penetrating hammer until the injection depth of the probe after hammering is less than or equal to the threshold value, recording the hammering times at the moment, if the probe point meets at least two conditions that the hammering time is greater than or equal to n, the injection total depth of the probe is greater than or equal to s meter and the water depth of the probe point is greater than or equal to average depth*m% at present, and judging the probe point on which the sand collecting activity is conducted at present. Through the river and lake sand collecting detecting instrument and the detection method provided by the invention, the sand collecting condition is rapidly accurately detected, and the underwater mining security is guaranteed.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Method and circuit for reducing switch concussion of switch type power supplier
InactiveCN101272093AReduce energy consumptionShorten the shock periodDc-dc conversionElectric variable regulationSchedule FrequencyControl circuit
The invention provides a method and circuit to reduce the switching oscillation in a switching type power supply; the switching type power supply comprises two transistors and the two transistors can not enter an off state simultaneously. A phase locked loop can be further arranged in the invention so as to the output frequency of a pulse width modulation control circuit to be equal to a scheduled frequency. Compared with a synchronous switching type power supply, the power supply of the invention has the advantage of saving energy consumption, which can greatly shorten the oscillation period.
Owner:RICHTEK TECH
Techniques for managing heterogenous nodes configured to support a homogeneous communication protocol
ActiveUS20160227543A1Data switching networksNetwork planningTelecommunications linkWireless mesh network
A wireless mesh network includes heterogeneous types of nodes, including continuously-powered nodes and battery-powered nodes. The battery-powered nodes may reside in a sleeping state most of the time to conserve power. The various nodes in the network may communicate with one another by transmitting and receiving at scheduled times and on scheduled frequencies. The battery-powered nodes may become active during the scheduled transmit and receive times. Network management nodes may facilitate network formation by transmitting information that reflects the scheduled transmit and receive times across the network. Based on this data, the continuously-powered nodes and battery-powered nodes may establish communication links with one another.
Owner:ITRON NETWORKED SOLUTIONS INC
Uplink precoding transmission method, network side equipment and terminal equipment
ActiveCN110572193AImprove transmission performanceSpatial transmit diversityUplink transmissionTerminal equipment
The embodiment of the invention discloses an uplink precoding transmission method, network side equipment and terminal equipment, and the method comprises the steps: transmitting DCI signaling when anuplink is configured to transmit a PUSCH based on a DFT-S-OFDM waveform; wherein the DCI signaling is used for indicating a plurality of to-be-scheduled frequency band resources and a TPMI corresponding to each to-be-scheduled frequency band resource to terminal equipment; the antenna ports corresponding to different to-be-scheduled frequency band resources are different, and the antenna ports corresponding to the different to-be-scheduled frequency band resources are determined by an uplink transmission codebook indicated by the TPMI; and the to-be-scheduled frequency band resource is a section of continuous PRB for transmitting the PUSCH. According to the method of the invention, the PUSCH can be transmitted on different antenna ports by different to-be-scheduled frequency band resources by utilizing antenna diversity and frequency selectivity diversity, and the transmission performance of the DFT-S-OFDM single-carrier system is effectively improved.
Owner:VIVO MOBILE COMM CO LTD
Techniques for managing heterogenous nodes configured to support a homogeneous communication protocol
A wireless mesh network includes heterogeneous types of nodes, including continuously-powered nodes and battery-powered nodes. The battery-powered nodes may reside in a sleeping state most of the time to conserve power. The various nodes in the network may communicate with one another by transmitting and receiving at scheduled times and on scheduled frequencies. The battery-powered nodes may become active during the scheduled transmit and receive times. Network management nodes may facilitate network formation by transmitting information that reflects the scheduled transmit and receive times across the network. Based on this data, the continuously-powered nodes and battery-powered nodes may establish communication links with one another.
Owner:ITRON NETWORKED SOLUTIONS INC
Methods and apparatus for multi-carrier, multi-cell wireless communication networks
ActiveCN101854188AMultiple modulation transmitter/receiver arrangementsTransmission path divisionCell specificCommunications system
Methods and apparatus for multi-carrier, multi-cell wireless communication networks. A method for multi-carrier, multi-cell, OFDMA wireless communication system includes: generating cell-specific pilot subcarriers by base station, wherein the cell-specific pilot subcarriers include information related to specific cells, specific base stations or both of them, and the cell-specific pilot subcarriers are placed at a schedule frequency position in the base station signal; generating common pilot subcarriers by the base station, wherein the common pilot subcarriers include information related to at least a plurality of cells, the base stations and common to both of them, and the common pilot subcarriers are placed in the scheduled frequency position in the base station signal; and transmitting the base station signal.
Owner:NEOCIFIC INC
Dynamic display method for editing interface and communication terminal comprising editing interface
ActiveCN103078994AReduce cognitive loadImprove experienceSubstation equipmentComputer graphics (images)Time segment
The invention is suitable for the technical field of communication and provides a dynamic display method for an editing interface and a communication terminal comprising the editing interface. The dynamic display method for the editing interface comprises the following steps of: performing statistics on the use frequency of at least one field item on the editing interface in a scheduled time quantum; displaying the field item on the editing interface if the use frequency of the field item reaches a scheduled frequency threshold value; and otherwise, not displaying the field item. Therefore, according to the dynamic display method for the editing interface and the communication terminal comprising the editing interface, the information amount displayed in the editing interface is reduced when a user performs editing on the editing interface of the communication terminal, and the cognitive load of the user is relieved.
Owner:DONGGUAN YULONG COMM TECH +1
Pretreating method, device and system in frequency domain resource scheduling
ActiveCN101778480AReduced launch capabilityReduce power consumptionEnergy efficient ICTRadio transmission for post communicationPretreatment methodEmissivity
The invention discloses a pretreating method, a device and a system in frequency domain resource scheduling. The method comprises the following steps of: dividing the whole bandwidth of a channel between a network side and a terminal into at least two sub-bands, and receiving Sounding signals sent by the terminal on a preset bandwidth of each sub-band; determining the channel characteristic of each sub-band according to the Sounding signals; and selecting one or more sub-bands from the at least two sub-bands according to the channel characteristic to schedule frequency domain resource for the terminal in the bandwidth range of the one or more sub-bands. The pretreating method, the device and the system in the frequency domain resource scheduling can reduce the requirement on the emissivity of the terminal and the power consumption of the terminal in the frequency domain resource scheduling, shorten the period for obtaining the bandwidth range spectrum characteristic for carrying out the frequency domain resource scheduling by the network side and improve the utilization rate of the frequency domain resource.
Owner:SHANGHAI HUAWEI TECH CO LTD
Traffic scheduling method and device
ActiveCN106254262AImprove stabilitySuppress shockData switching networksTraffic capacitySchedule Frequency
The invention provides a traffic scheduling method and device which are applied to an SDN (Software Defined Network) controller. According to the method, by setting a transmission interval threshold of a path, and controlling repeatedly scheduled frequency of the same path, a purpose of oscillation suppression is realized, and the stability of the SDN is improved.
Owner:NEW H3C TECH CO LTD
Method and system for coordinating and scheduling frequency band resources in cellular network
InactiveCN102104964BImprove effectivenessImprove fairnessWireless communicationIntermediate frequencyData exchange
The invention discloses a method and system for coordinating and scheduling frequency band resources in a cellular network. The method comprises the following steps of: classifying user terminals into UE-CO (User Terminals to be Coordinated) and UE-NCO (User Terminals not to be Coordinated) according to the quality of a channel; dividing frequency band resources into a plurality of equal frequency bands, and determining the starting point of each frequency band; measuring the average value of receiving power RSRP (Reference Signal Receiving Power) of each sector in the periphery by using the UE-CO, determining the maximum interference source, and allocating the frequency band resources according to the maximum interference source; assuming that the maximum interference source of the UE-CO is eliminated, and calculating the rate gain value delta C increased by a user by a base station accessed to a cell; and when the rate gain value delta C is greater than a preset threshold, sending a request for coordinating interference to the base station in which the maximum interference source isby using the UE-CO, and simultaneously reporting the quantized delta C'. The invention can increase the throughput of users in the edges of a cell and the total throughput of the system by less data exchange, and is helpful for improving the effectivity and the justification of the system.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Time sequence recovery device and method with protection function
InactiveCN1933000AReduce omissionsActions that do not interrupt the normal tracking frequencyRecord information storageDigital signal error detection/correctionCompact discLocking mechanism
The timing resuming device and method with protecting function uses for one CD (Compact Disc) reading system. When the timing character is good, it counts by frequency estimator and store proper frequency estimated value as scheduled frequency estimated value and detect whether the CD reading system read the CD area with vice by vice detector. If it finds vice, store the scheduled frequency estimated value as basement of frequency locked and phase locked to produce referenced timing. When it gets right, restart natural frequency locked mechanism to lock input signal in shorter time. It can greatly reduce the dropping of readable data for frequency doffed and break the action about normally tracking frequency of frequency locked mechanism.
Owner:SUNPLUS TECH CO LTD
Frequency physics resource scheduling method and system based on frequency hopping
InactiveCN102045789BAvoid collisionAvoid voidsError preventionNetwork traffic/resource managementSystem capacityStatic dispatch
The disclosure discloses a method and a system for scheduling frequency physical resources based on frequency hopping. The method comprises: in two time slots of frequency hopping transmission, reserving frequency physical resources for an activated semi-persistent scheduling new transmission user with a transmission period reached and a retransmission user; obtaining a scheduling type of a user required for scheduling, and according to an occupancy situation of the frequency physical resources, obtaining corresponding available frequency physical resources when employing a frequency-selective scheduling type and a non-frequency-selective scheduling type; and according to the scheduling type of the user required for scheduling, searching for corresponding available frequency physical resources, and allocating the frequency physical resources to a frequency-selective scheduling user and a non-frequency-selective scheduling user simultaneously during one scheduling period. The disclosure comprehensively utilizes advantages of the frequency-selective scheduling and non-frequency-selective scheduling, so that the users with good channel quality can utilize the frequency-selective scheduling to obtain the optimal frequency resources, the users without channel quality information can obtain frequency diversity gain through frequency hopping, and the system capacity can be improved without increasing equipment costs.
Owner:ZTE CORP
Electric mosquito swatter
InactiveCN106386753AAvoid wavingPrevent knock downInsect catchers and killersSchedule FrequencyComputer science
The invention discloses an electric mosquito swatter. The electric mosquito swatter comprises a swatter frame (1), a swatter handle (2) connected with the swatter frame (1), an electric net (3) installed in the swatter frame (1), multiple audio collectors (5) which are installed on the swatter frame (1) and used for collecting audio signals within the scheduled frequency range, a mosquito locator (6) which is installed in the swatter handle (2) and used for determining the directions of mosquitoes according to the audio signals and a mosquito indicator (7) which is installed on the swatter handle (2) and used for indicating the location for a user of the electric mosquito swatter so as to enable the user to beat the mosquito more accurately. According to the electric mosquito swatter, the situation that people brandish the electric mosquito swatter aimlessly due to the fact that people cannot judge the general location of the mosquito can be avoided, and therefore the situation that people knock utensils over or hurt children by mistake is avoided to a certain extent.
Owner:王浩达
Method and device for scheduling frequency band resources
ActiveCN105264992BReduce distractionsCriteria allocationWireless communicationCommunications systemSchedule Frequency
The present invention discloses a method and device for scheduling frequency band resources, including: firstly, selecting subbands to be allocated to user terminals according to the transmission quality of each subband to be selected; , whether the reduction in the transmission quality of the user terminal exceeds the first predetermined value, if so, the selected subband is not allocated to the user terminal, otherwise, the selected subband is allocated to the user terminal. The technical solution provided by the invention can effectively reduce the interference in the wireless communication system.
Owner:HUAWEI TECH CO LTD
Method and device capable of dividing cell clusters
ActiveCN102457853BAddresses issues that do not truly reflect the current state of coverageTransmissionNetwork planningDividing cellCarrier signal
The invention provides a method and a device capable of dividing cell clusters, wherein the method comprises the following steps of: during a process of dividing the cell clusters, fully considering quantity of carrier waves configured by cells and geographical positions of the cells, and dividing the cells into the cell clusters, wherein the cells are continuous on a region and satisfy a scheduled frequency limitation reuse relationship. In the invention, a dividing result to the cell clusters is reasonable and effective, and a scientific and quantitative standard and a scientific and quantitative guidance can be provided for network optimization.
Owner:CHINA MOBILE GRP GUANGDONG CO LTD
Dynamic display method for editing interface and communication terminal comprising editing interface
ActiveCN103078994BReduce cognitive loadImprove experienceSubstation equipmentComputer graphics (images)Time segment
Owner:DONGGUAN YULONG COMM TECH +1
River and lake sand mining detector and detection method
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Pretreating method, device and system in frequency domain resource scheduling
ActiveCN101778480BReduced launch capabilityReduce power consumptionEnergy efficient ICTRadio transmission for post communicationPretreatment methodEmissivity
Owner:SHANGHAI HUAWEI TECH CO LTD
Time sequence recovery device and method with protection function
InactiveCN1933000BReduce omissionsActions that do not interrupt the normal tracking frequencyRecord information storageDigital signal error detection/correctionCompact discLocking mechanism
The timing resuming device and method with protecting function uses for one CD (Compact Disc) reading system. When the timing character is good, it counts by frequency estimator and store proper frequency estimated value as scheduled frequency estimated value and detect whether the CD reading system read the CD area with vice by vice detector. If it finds vice, store the scheduled frequency estimated value as basement of frequency locked and phase locked to produce referenced timing. When it gets right, restart natural frequency locked mechanism to lock input signal in shorter time. It can greatly reduce the dropping of readable data for frequency doffed and break the action about normally tracking frequency of frequency locked mechanism.
Owner:SUNPLUS TECH CO LTD
Analog video signal format determination system and method and related devices
ActiveCN102724459BImprove compatibilitySimplify the matching processTelevision system scanning detailsClosed circuit television systemsComputer compatibilityCarrier signal
The invention discloses an analog video signal format determination system and method and related devices, which are used for simplifying the matching process of analog video signal format types and improving the compatibility of a receiving device. The analog video signal format determination system comprises a video signal acquisition device and a plurality of video signal receiving devices, wherein each video signal receiving device is used for generating carrier signals with scheduled frequency when having a high-definition analog video signal decoding capacity, and each video signal receiving device is also used for outputting the carrier signals with the scheduled frequency to the video signal acquisition device; and the video signal acquisition device is used for determining whether to receive the carrier signals with the scheduled frequency sent by the video signal receiving devices; and the video signal acquisition device is also used for determining whether the video signal receiving devices support the high-definition analog video signal format when receiving the carrier signals with the scheduled frequency sent by the video signal receiving devices, otherwise, the video signal acquisition device determines that the video signal receiving devices do not support the high-definition analog video signal format.
Owner:ZHEJIANG DAHUA TECH CO LTD
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