Abstract: A routing optimization method includes: establishing a routing optimization proxy binding relationship between a proxy mobile agent (PMA) of a mobile node and a PMA of a correspondent node; controlling, by the PMA of the mobile node, according to the established routing optimization proxy binding relationship, routing of a message to be transmitted. And a message transmission system based on a PMA is also provided, which includes: a proxy binding control unit, configured to establish a routing optimization proxy binding relationship with a PMA of a correspondent node; and a routing control unit, configured to control routing of a message to be transmitted based on the established routing optimization proxy binding relationship. With the present invention, it may raise the communication efficiency for various nodes in the proxy mobile IP architecture and improve the routing performance.

Abstract: A power control circuit of a universal serial bus (USB) includes a USB interface, a north bridge chipset and a current control circuit. The USB interface has a power pin and a plurality of data pins. The north bridge chipset has a state pin and a plurality of signal pins connected to the data pins of the USB interface respectively. The current control circuit is connected between the power pin of the USB interface and the state pin of the north bridge chipset, the north bridge chipset controls the state of the current control circuit and further controls the output power at the power pin of the USB interface. The power control circuit can offer different output powers in accordance with different external devices.

Abstract: An exemplary system for keeping desktop management interface (DMI) dynamic information is disclosed. The system includes a power supply (1) and a computer (2). The computer includes a central processing unit (CPU) (3), a north bridge chip (4), a south bridge chip (7), a memory (5), and a basic input/output system read-only memory (BIOS ROM) (8). The memory includes a shadow random access memory (RAM) (6), which is configured for storing all kinds of BIOS programs and keeping DMI dynamic information. The BIOS ROM includes a ROM temporary storage (9) and a DMI data storage (10). The ROM temporary storage is configured for storing backed-up DMI dynamic information from the shadow RAM after updating the BIOS of the computer and cleaning up the DMI dynamic information in the DMI data storage. A related method is also disclosed.

Abstract: A video signal circuit of a notebook computer includes a north bridge chipset, a control module, a VGA port, an A/D converter, a selection module, and a control unit. The north bridge chipset is coupled to the control module and the selection module. The VGA port is coupled between the control module and a display device and a processing device. The A/D converter is coupled between the control module and the selection module. The selection module is coupled to an LCD of the notebook computer. The control unit is coupled to the selection module and the control module. The video signal circuit can be controlled to send a first analog and digital video signals generated by the north bridge chipset to the displaying device and the LCD respectively, or receive a second analog video signal from the processing device and display it on the LCD.

Abstract: An exemplary system for keeping desktop management interface (DMI) dynamic information is disclosed. The system includes a power supply (1) and a computer (2). The computer includes a central processing unit (CPU) (3), a north bridge chip (4), a south bridge chip (7), a memory (5), and a basic input/output system read-only memory (BIOS ROM) (8). The memory includes a shadow random access memory (RAM) (6), which is configured for storing all kinds of BIOS programs and keeping DMI dynamic information. The BIOS ROM includes a ROM temporary storage (9) and a DMI data storage (10). The ROM temporary storage is configured for storing backed-up DMI dynamic information from the shadow RAM after updating the BIOS of the computer and cleaning up the DMI dynamic information in the DMI data storage. A related method is also disclosed.

Abstract: A power control circuit of a universal serial bus (USB) includes a USB interface, a north bridge chipset and a current control circuit. The USB interface has a power pin and a plurality of data pins. The north bridge chipset has a state pin and a plurality of signal pins connected to the data pins of the USB interface respectively. The current control circuit is connected between the power pin of the USB interface and the state pin of the north bridge chipset, the north bridge chipset controls the state of the current control circuit and further controls the output power at the power pin of the USB interface. The power control circuit can offer different output powers in accordance with different external devices.

Abstract: The utility model discloses a power source cabinet comprising a power source disposed within the cabinet body, an inverter portion connected to the power source, an air pump portion powered by the output power source of the inverter, positive and negative electrical clips connected to the power source, placed within the electrical clip box on both sides of the cabinet body, and respectively connected to the positive and negative of the power source, and a function panel disposed on the cabinet body. Thereby the battery will be protected from being easily damaged, have a prolonged lifespan, be convenient to use, be safe and reliable while charging, and motor vehicles will be started easily.