Abstract: The invention discloses a starch-based multi-channel airflow unit and a preparation method and an application thereof. The preparation method of the present invention comprises the following steps: melting a polylactic acid, wherein a temperature of a first temperature control zone is 135° C. to 145° C., a temperature of a second temperature control zone is 175° C. to 185° C., a temperature of a third temperature control zone is 190° C. to 200° C., and a temperature of a fourth temperature control zone is 175° C. to 185° C.; gelatinizing a starch-based material, adding the starch-based material in the third temperature control zone and fully mixing the mixture; adding a polyol in the third temperature control zone, and fully mixing the mixture; and extruding out the mixed material through twin screws, sizing in vacuum, cooling and sizing, and winding and cutting to obtain the starch-based multi-channel airflow unit.

Abstract: Provided are a method and system for upgrading patching software for a communication device in which software on a forwarding plane is separated from software on a control plane and management plane. The method comprises: a version management process triggers an end of at least one old version process to be upgraded, and keeps data and data states of an upstream process and of a downstream process of the old version process unchanged; when the at least one old version process to be upgraded is successfully ended, the version management process triggers a start of a new version process; and, the upstream process and the downstream process assist the new version process to restore data and data states. The system comprises: a version management component and a data restoration component.

Abstract: The present invention discloses a method of broadband access device for controlling a DHCP relay user, which method comprises modifying protocol fields in all of DHCP messages interacted between a DHCP relay and a DHCP client and a DHCP server during initiation phase of the DHCP interaction at Application Layer of TCP/IP protocol so that all of the DHCP messages interacted between the client and the server can pass through the DHCP relay. The present invention can easily control and manage the interaction between the DHCP client and the external DHCP server, vary the network parameters of the DHCP user and detecting the DHCP user online and so on according to the requirements of the user management strategy. Furthermore, the present invention only needs to process Application Layer of TCP/IP protocol to achieve the predetermined purpose of control management.