Alibaba Group Holding Limited

Zhejiang Lab

Ulsee Inc.

Inventronics (hangzhou), Inc.

Alipay Information Technology Co., Ltd.

Yang Liu

Guichao Hua

Xiaoli Yao

Liang'an Ge

Yawen Wei

Zhiwei Wang

Shiji Wang

Hanyin Fang

Guanjun Jiang

Yunjiang Rao

Bing Han

Shisheng Dong

Caiyun Li

Lingmei Ma

Xiaobo Zhang

Peng Qiu

A distributed acoustic sensing (DAS) system based on random fiber lasing amplification (RFLA) and a Rayleigh scattering enhanced fiber (RSEF), and relates to the field of distributed optical fiber sensing. The system comprises a DAS demodulation unit, a high-order RFLA unit and a RSEF. The present disclosure adopt the high-order RFLA technology to replace the traditional high-order distributed Raman amplification technology, and it does not need to use a plurality of pumps with different wavelength, and only needs a high-order random fiber laser pump and a broadband reflector to provide feedback for cascaded random fiber lasings to perform distributed amplification on signal light. By using high-order RFLA combined with the RSEF, high-efficiency and low-threshold RFLA can be achieved, and the signal-to-noise ratio and performances of a DAS system can be further improved, which enables realization of long-distance and high-performance distributed acoustic sensing.

Distributed acoustic sensing system based on random laser amplification and scattering enhanced optical fiber

The specification discloses a question answer matching method, system and computer storage medium. The method comprises: transforming the user query and one of one or more suggested answers corresponding to the user query by using a pre-trained word vector to obtain vector representations of the user query and the one of one or more suggested answers corresponding to the user query; performing a convolutional operation on the vector representations of the user query and the one of one or more suggested answers, respectively, to extract features; and mapping convolution results of the vector representations of the user query and the vector expression of the one of one or more suggested answers into a sample annotating space, to obtain a matching result of the user query.

Question and answer matching method, system and storage medium

Implementations of this disclosure provide an authentication system for handling authentication requests. An example method performed by a server includes receiving an access request that includes identification information to be used by the server for selecting a target authentication system, and determining that the access request does not have access permission. In response to determining that the access request does not have access permission, the server selects the target authentication system from at least two authentication systems, based on a predetermined authentication system selection policy and based on the identification information in the access request, and sends the access request to the selected target authentication system for authentication.

Selecting an authentication system for handling an authentication request

A method of reconstructing videos by using super-resolution algorithm includes the steps: (a) providing a video, wherein the video is composed of a plurality of frames having a sequence; (b) starting a first thread and a second thread, the first thread performing a first algorithm and the second thread performing a second algorithm for improving resolution, wherein a time complexity of the first algorithm is greater than a time complexity of the second algorithm; (c) the first thread sequentially reading the frames of the video in units of a first interval and processing the frames in order to obtain first processed frames, and the second thread sequentially reading the frames of the video in units of a second interval and processing the frames in order to obtain second processed frames, wherein a value of the first interval is an integer greater than 1, and a value of the second interval is 1; (d) performing a fusion operation on the second processed frames which is processed by the second thread and the nearest first processed frames which is processed by the first thread in order to obtain a plurality of fusion frames; and (e) displaying the plurality of fusion frames according to the sequence. The present disclosure can solve the problem that video super-resolution in real-time, computing time and resolution are difficult to be taken into account simultaneously.

Method and system of reconstructing videos by using super-resolution algorithm

A load driving device and system, and a limiting point control method and device. The load driving device comprising: a voltage/current regulative main circuit placed under the control of an output current controller, for use in conducting a voltage conversion on an input voltage, and in supplying electric power to a subsequent load unit; a sampling unit connected to an output terminal of the main circuit, for use in sampling an output feature parameter of the main circuit; the output current controller, for use in controlling a limiting point of the main circuit, and on the basis of the adjustment direction of the limiting point and on changes of the output feature parameters of the main circuit before and after an adjustment, determining a steady working point for the main circuit, and controlling the main circuit to work at the steady working point. The load driving device and system enable an increase in driver reliability and a reduction in circuit complexity.

Load driving device and system, limiting point control method and device

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HangZhou, China

Yang Liu