Abstract: This application disclose a link configuration method, to configure a DSVPN tunnel interface parameter. A controller obtains a first link profile for a first site and a second link profile for a second site from a link profile library, where the link profile library includes a plurality of link profiles. The controller obtains preconfigured global configuration information, where the global configuration information includes an address pool. The controller generates a first link configuration parameter of the first site and a second link configuration parameter of the second site based on the address pool, the first link profile, and the second link profile and according to a preset link configuration rule. The controller sends the first link configuration parameter to the first site and sends the second link configuration parameter to the second site.

Abstract: This application disclose a link configuration method, to configure a DSVPN tunnel interface parameter. A controller obtains a first link profile for a first site and a second link profile for a second site from a link profile library, where the link profile library includes a plurality of link profiles. The controller obtains preconfigured global configuration information, where the global configuration information includes an address pool. The controller generates a first link configuration parameter of the first site and a second link configuration parameter of the second site based on the address pool, the first link profile, and the second link profile and according to a preset link configuration rule. The controller sends the first link configuration parameter to the first site and sends the second link configuration parameter to the second site.

Abstract: Computing device, computer instructions and method for determining an image of a surveyed subsurface. The method includes receiving recorded wave fields D recorded with seismic sensors over the subsurface; generating a series of modified recorded wave fields Dn based on the recorded wave fields D; iteratively applying an objective function Fi to (1) one element Di of the series of modified recorded wave fields Dn and (2) predicted wave fields Pmi, where “i” is an index associated with a given iteration; calculating with a computing device an updated velocity model mi+1 based on a previous velocity model mi and a step length; and producing the image of the subsurface based on the recorded wave fields D and the updated velocity model mi+1. The predicted wave fields Pmi are predicted by the previous velocity model mi.

Abstract: Computing device, computer instructions and method for determining an image of a surveyed subsurface. The method includes receiving recorded wave fields D recorded with seismic sensors over the subsurface; generating a series of modified recorded wave fields Dn based on the recorded wave fields D; iteratively applying an objective function Fi to (1) one element Di of the series of modified recorded wave fields Dn and (2) predicted wave fields Pmi, where “i” is an index associated with a given iteration; calculating with a computing device an updated velocity model mi+1 based on a previous velocity model mi and a step length; and producing the image of the subsurface based on the recorded wave fields D and the updated velocity model mi+1. The predicted wave fields Pmi are predicted by the previous velocity model mi.