Abstract: Disclosed are methods for non-invasively detecting fetal chromosomal abnormality in maternal samples using high throughput sequencing technologies. The present invention provides a method to minimize the influence of G/C-content in analyzing sequencing data and thus increase the sensitivity and accuracy in detecting any aneuploid chromosome in a genome. This method is especially helpful for analyzing sequencing data with lower quality or low coverage.

Abstract: An embodiment of the present invention disclose a method for fast forward/backward play of video data includes: obtaining fast forward/backward index information that meets a fast forward/backward play request from a pre-generated fast forward/backward sequence index file according to the fast forward/backward play request from a client; and obtaining video data that meets the fast forward/backward play request from a pre-generated fast forward/backward sequence file according to the index information and transmitting the video data to the client via a network. An embodiment of the present invention also discloses a streaming server. With the method and streaming server provided by the present invention, the fast forward/backward video data reading efficiency of the streaming server may be improved.

Abstract: A method for detecting QoS anomaly is provided. The method includes obtaining a QoS index of data stream transmission of a parent peer, and detecting QoS anomaly of the parent peer according to the QoS index and a corresponding QoS index threshold. A method for detecting factors causing QoS anomaly is also provided. The method includes detecting whether QoS of an associated peer is abnormal or not, counting a QoS anomaly proportion of the associated peer statistically, and determining factors causing QoS anomaly according to the anomaly proportion of the associated peer. Correspondingly, a system for detecting QoS anomaly and a system for detecting factors causing QoS anomaly are also provided. Thus, the QoS anomaly information is detected, and the factors causing the QoS anomaly are also detected, so as to ensure that the QoS anomaly information is precisely detected in a P2P system, and the QoS in the system is indeed guaranteed.

Abstract: An embodiment of the present invention disclose a method for fast forward/backward play of video data includes: obtaining fast forward/backward index information that meets a fast forward/backward play request from a pre-generated fast forward/backward sequence index file according to the fast forward/backward play request from a client; and obtaining video data that meets the fast forward/backward play request from a pre-generated fast forward/backward sequence file according to the index information and transmitting the video data to the client via a network. An embodiment of the present invention also discloses a streaming server. With the method and streaming server provided by the present invention, the fast forward/backward video data reading efficiency of the streaming server may be improved.