Abstract: An optimized design method for manufacturing a Fresnel grating is disclosed, including the following steps: (1) making a Fresnel surface type of the Fresnel grating equivalent to a curved surface type, and determining, based on the curved surface type to which the Fresnel surface type is equivalent, an optical path difference function of the Fresnel grating: ? (?)=<AP1P2B>?<AOB>+Nm?; and (2) determining a Fresnel grating parameter that minimizes a function value of the optical path difference function, so as to manufacture a Fresnel grating that has an aberration elimination effect. The manufactured Fresnel grating may effectively eliminate a portion of aberrations of the Fresnel grating, and increase a resolution of a spectrometer.

Abstract: An optimized design method for manufacturing a Fresnel grating is disclosed, including the following steps: (1) making a Fresnel surface type of the Fresnel grating equivalent to a curved surface type, and determining, based on the curved surface type to which the Fresnel surface type is equivalent, an optical path difference function of the Fresnel grating: ? (?)=<AP1P2B>?<AOB>+Nm?; and (2) determining a Fresnel grating parameter that minimizes a function value of the optical path difference function, so as to manufacture a Fresnel grating that has an aberration elimination effect. The manufactured Fresnel grating may effectively eliminate a portion of aberrations of the Fresnel grating, and increase a resolution of a spectrometer.

Abstract: A media resource management method, a media resource management device, a media resource management equipment, and a media resource management system are provided. The media resource management method includes the following steps. First, algorithm complexities of media resources are obtained according to a type of a service, in which the algorithm complexities are algorithm complexities of media resources required by the service. Next, an algorithm complexity of the service is determined according to the algorithm complexities of the media resources required by the service. Then, a capability of processing the service is determined according to the algorithm complexity of the service, and then the media resources are allocated.

Abstract: A method, device, and system for implementing a video conference are disclosed. The method for implementing a video conference includes: creating a video image with ImageId information; defining an image data source and an image data output for the created video image; and acquiring and sending image data according to the image data source and the image data output of the video image with the ImageId information. A video conference model established by using the method is an image-based video conference model, i.e., an abstract image layer is proposed between the user layer and the video conference layer. Through the technical solutions, phenomena such as that a plurality of playback commands exists for a plurality of users, that one record is maintained for each user who watches the video image, and that time synchronization is considered when a same video image is played back for a plurality of users may be avoided.

Abstract: A media resource management method, a media resource management device, a media resource management equipment, and a media resource management system are provided. The media resource management method includes the following steps. First, algorithm complexities of media resources are obtained according to a type of a service, in which the algorithm complexities are algorithm complexities of media resources required by the service. Next, an algorithm complexity of the service is determined according to the algorithm complexities of the media resources required by the service. Then, a capability of processing the service is determined according to the algorithm complexity of the service, and then the media resources are allocated.