Maxphotonics Corporation

Zte Corporation

Tencent Technology (shenzhen) Company Limited

Maxphotonics Co., Ltd.

Feng Bo Jiang

Jun Song

Gaofeng He

Xiaobo Hu

Fang Zhou Chen

Wei Li

Wei Bai

Li Zhang

Jun Ming Yan

Kai Feng Li

Hong Chen

Cheng Wu

Zheng Chen

Zhihui Zhang

Chi Huang

Ling Zhou

Jian Ju

Yiran Liu

Quanfa Li

Rui Tao

Yixin Jiang

Shaofeng Zhou

Liangjie Huang

A method and apparatus for defending against a DNS attack includes receiving a DNS request from a request source and obtaining an IP address of the request source, calculating a characteristic value of the IP address, and searching an internal memory for preset identifier information corresponding to the characteristic value. Based on the preset identifier information corresponding to the characteristic value being a detection identifier indicating an uncertainty of an existence of an attack risk in the DNS request, the method includes obtaining request record information and an unblocking time corresponding to the characteristic value, the request record information including a number of request times from the request source in a predetermined period. Based on the number of request times exceeding a preset request threshold, determining that the DNS request is an attack request and discarding the DNS request.

Method and apparatus for defending against DNS attack, and storage medium

A data synchronization method, system and apparatus are provided. The method includes receiving a request including data to be uploaded, from a client, and responding to the request after data is successfully obtained from the client, and storing the obtained data. For data whose size is less than a threshold value, a synchronization request is sent to a standby server to request the standby server to store the data. Otherwise a second type work log, including information indicating that data that has not been synchronized, is generated and stored. Data whose size is greater than or equal to the threshold value is not synchronized immediately, but is recorded in the work log. In some cases, data whose size is less than the threshold value, but fails to be synchronized, is recorded in the work log. Synchronization of this data may be subsequently completed according to the work log, so that the synchronization of this data can avoid affecting synchronization of other data. A first-type work log comprising information about the data may be generated and stored in response to the data being synchronized to the standby server successfully. Data that has not been synchronized to the standby server, according to the indication information, may be locally read and the data sent to the standby server to be stored. Data may be sent to the standby server to replace other data, in response to verification codes, such as hash codes, being inconsistent. The first and second work logs may also be sent to a log backup device. Responding to the uploading request and sending data to the standby server may occur asynchronously.

Data synchronization method, system, and apparatus using a work log for synchronizing data greater than a threshold value

Described are a ranging method, and an automatic focusing method and device. The ranging method comprises: acquiring a coefficient of relationship between the number of pixels and the object distance within a range of a distance between a camera and a projection lens on the basis of a preset calibrated object distance; and calculating an actual object distance according to the acquired coefficient of relationship.

Ranging method, automatic focusing method and device

Disclosed are a laser marking equipment and system. The equipment includes: a laser marking machine and a control platform. The laser marking machine is controlled by the control platform, the laser marking machine includes: a laser device and a galvanometer, the galvanometer being configured to move at a predetermined moving speed; and the laser device being configured to output laser; the laser marking equipment further includes: a first obtaining module obtaining coordinate and a gray scale value of the target image pixel dot; a first calculation module calculating output power of the target image pixel dot; a second obtaining module obtaining the material information to be marked; a third obtaining module obtaining corresponding material output power; a secondary calculation module calculating an amended output power; and a control module controlling the laser device to output laser specific to each target image pixel dot.

Laser marking equipment and laser marking system

The embodiments of the disclosure provide a correction method for laser marking, comprising: obtaining an image to be marked; in a preset coordinate system of a laser marker, determining a fracture region and a non-fracture region of the image to be marked; correcting the non-fracture region of the image to be marked by using a preset correcting formula; correcting the fracture region of the image to be marked by using a preset standard correction value and a preset weighted coefficient corresponding to coordinate position; and marking with the corrected image to be marked. According to the disclosure, by providing weighted correction for the mark points within the fracture region according to finely divided coordinate positions, the distortion correction for the fracture region can be completed without measuring deviation values of marking region with high density and high precision.

Correction method and device of laser marking

The present invention discloses a method for detecting influence on a laser from back-reflected light of the laser and a detection device. The method includes: receiving laser light input by a laser; splitting the input light into first detection light and second detection light via a beam coupler having a specific distribution proportion, and outputting the first detection light and the second detection light to a first optical power meter and an adjustable reflector, respectively; receiving a part of the second detection light reflected by the adjustable reflector, splitting the part of the second detection light reflected by the adjustable reflector into first back-reflection light and second back-reflection light, and returning the first back-reflection light and the second back-reflection light to the laser and the first optical power meter, respectively, detecting power of the first detection light by using the first optical power meter, and detecting power of the second back-reflection light by using a second optical power meter, and calculating power of the input light of the laser and power of the first back-reflection light, and establishing a power corresponding relationship between the power of the first back-reflection light and the power of the input light of the laser. By means of the foregoing manner, the present invention can detect a corresponding relationship between power of back-reflection light and power of input light of a laser.

Method for detecting influence on laser from back-reflection light of laser and detection device

Disclosed a laser marking machine, method, equipment and system. The method comprises steps of: the control main board receiving coordinate and gray scale value of the target image pixel dot; calculating output power of the target image pixel dot by using the gray scale value; and controlling the laser device to use corresponding output power according to displacement of the galvanometer, and outputting laser specific to each target image pixel dot. By adjusting the output power of target image pixel dot (marking point), a separate pixel dot may reflect the change of gray scale value, so as to represent the image gray scale value. The coordinate of each pixel dot in the gray scale image may be calculated according to the predetermined resolution, such that, the coordinate of pixel dot is no longer adjusted, ensuring the DPI and the resolution of the gray scale image.

Laser marking machine, laser marking method, laser marking equipment and laser marking system

The present disclosure discloses a fiber laser, including a laser seed source, an amplifying optical path, an output optical isolator and an optical fiber cylinder; wherein, the amplifying optical path is connected to the laser seed source and the output optical isolator, the laser seed source is used to output optical source, the amplifying optical path includes a first stage amplifying optical path and a second stage amplifying optical path, the first stage amplifying optical path is connected to the laser seed source and the second stage amplifying optical path respectively, the output optical source is output via the output optical isolator after two-stage amplifying; the second stage amplifying optical path comprises a multi-mode active optical fiber; the multi-mode active optical fiber is coiled on the optical fiber cylinder. By the disposing way above, the present disclosure may improve output optical beam quality of the fiber laser.

Fiber laser

The present invention discloses a method for controlling a laser marking machine and a laser marking machine. The laser marking machine includes an interface module, a processing module, a laser control module and a galvanometer control module. The interface module receives marking data packets and transfers the marking data packets to the processing module. The processing module parses the marking data packets to obtain marking instructions and control parameters, extracts laser control instruction(s) and galvanometer control instruction(s) from the marking instructions, extracts laser control parameter(s) and galvanometer control parameter(s) from the control parameters, transfers the laser control instruction(s) and the laser control parameter(s) to the laser control module, and transfers the galvanometer control instruction(s) and the galvanometer control parameter(s) to the galvanometer control module.

Method for controlling laser marking machine and laser marking machine

The present invention discloses a method for assigning the carrier frequency in a trunking system, which includes: after the base station subsystem receiving a group call request, it assigns a carrier frequency reference for this group call, by which to establish the forward channels of the group users managed by the base station subsystem. With the method offered by the present invention, all the group members under a base station subsystem could be established on the same carrier frequency reference as far as possible, thereby sharing of the wireless channels.

Growing community of inventors

Shenzhen, China

Feng Bo Jiang