Abstract: The present disclosure provides a method, apparatus, medium and device for extracting a river drying-up region and frequency, and belongs to the technical field of remote sensing. The method for extracting a river drying-up region and frequency can be applied to efficiently acquiring river drying-up information for a long time within the large spatial region. With the inverse normalized difference water index (iNDWI) and the maximum value composite (MVC) method for the remote sensing images, the present disclosure omits the troublesome step of separately extracting a river range for each image in the conventional method. In addition, the present disclosure quickly obtains the drying-up frequency by counting the total number of available images and the number of non-water images at the same pixel position, and yields a greater efficiency for extracting the river drying-up region and frequency.

Abstract: The present disclosure provides a method, apparatus, medium and device for extracting a river drying-up region and frequency, and belongs to the technical field of remote sensing. The method for extracting a river drying-up region and frequency can be applied to efficiently acquiring river drying-up information for a long time within the large spatial region. With the inverse normalized difference water index (iNDWI) and the maximum value composite (MVC) method for the remote sensing images, the present disclosure omits the troublesome step of separately extracting a river range for each image in the conventional method. In addition, the present disclosure quickly obtains the drying-up frequency by counting the total number of available images and the number of non-water images at the same pixel position, and yields a greater efficiency for extracting the river drying-up region and frequency.

Abstract: An antenna system is provided, including a ground plane, a first antenna unit, a second antenna unit, a first ground unit and a second ground unit. The ground plane includes a first side and a second side. The first ground unit and the ground plane jointly form a first closed loop, and a length of the first ground unit matches the first high-frequency signal and the second high-frequency signal to provide grounding of the high-frequency signals. The second ground unit forms a second closed loop and is connected to the first ground unit, and a length of the second ground unit is greater than the length of the first ground unit. A sum of the length of the second ground unit and the length of the first ground unit matches the first low-frequency signal and the second low-frequency signal, to jointly provide the grounding of the low-frequency signals.

Abstract: An antenna system is provided, including a ground plane, a first antenna unit, a second antenna unit, a first ground unit and a second ground unit. The ground plane includes a first side and a second side. The first ground unit and the ground plane jointly form a first closed loop, and a length of the first ground unit matches the first high-frequency signal and the second high-frequency signal to provide grounding of the high-frequency signals. The second ground unit forms a second closed loop and is connected to the first ground unit, and a length of the second ground unit is greater than the length of the first ground unit. A sum of the length of the second ground unit and the length of the first ground unit matches the first low-frequency signal and the second low-frequency signal, to jointly provide the grounding of the low-frequency signals.

Abstract: A network packet capturing method for capturing a plurality of packets from a physical layer to an application layer by a network server through a network card is described. The packet capturing method includes the following steps. Capture packets by a new application interface (NAPI); set a ring queue in a kernel; provide a hook process for capturing the packets; store the captured packets into the ring queue; and map the packets stored in the ring queue into a memory space of a corresponding application through memory mapping, thereby reducing the number of interrupts of the system and the number of replications during the packets parsing.

Abstract: A method of protecting data in the cache memory of a storage system is used to protect the data stored in the cache memory of a first storage system and a second storage system coupled together and with the battery backed function. When the first storage system and the second storage system function normally, the data in their cache memory are mutually backed up. When any of the storage system has a power failure situation, the other normal storage system takes over the malfunctioned storage device. The data in its own cache memory are protected using the battery backed function. After the malfunctioned storage system restarts, the two storage systems keep backing up the data in the cache memory of each other. This provides a thorough protection of the data in the cache memory of the storage systems, increasing the reliability thereof.

Abstract: A method of protecting the cache memory data in a storage system is used to protect the data in the cache memory of a battery backed storage system. The method provides a preserved area in the random access memory (RAM) of the system for storing the information of disk cache items. When the storage system has a power failure, the battery backed function provides power to protect the data stored in the RAM of the system being lost. When the storage system resumes, the information stored in the preserved area preserves the data stored in the disk cache of the system RAM. After the storage system resumes, the data stored in the disk cache of the RAM of the system are written into the corresponding block device. These implement the power failure protection for the data stored in the disk cache of the RAM of the system.

Abstract: An Internet protocol (IP) address take-over system in a local area network and a method thereof are provided. The IP address take-over system takes over the IP addresses in a server connecting with a plurality of clients and containing a plurality of network interface cards, and automatically updates the media access control (MAC) addresses stored in the address resolution protocol (ARP) caches of the clients and corresponding to the IP address of the server, so as to guarantee the continuity of the network communication between the clients and the server, and improve the reliability of the server.

Abstract: A method of detecting heartbeats and the device thereof are applied to a cluster server. It includes a first controller, a second controller, and a detecting module. The detecting module does the counting according to a first predetermined period. If the detecting module receives a first reset signal of the first controller before the first predetermined period, it determines that the operation of the first controller is normal. If the detecting module has not receive the first reset signal of the first controller before the first predetermined period, then the operation of the first controller is determined to be abnormal. The detecting module sends out a control signal to start the second controller. The second controller communicates with the first controller to execute the corresponding failure transfer program and to interrupt the operation of the first controller.

Abstract: A system of protecting data in write-back cache between storage systems and the method thereof are employed to protect data in the write-back cache between a first storage system and a second storage system. The system adds, updates, or deletes the data in the second storage system backed up from the write-back cache of the first storage system by monitoring operations on the write-back cache of the first storage system and sending a corresponding command to the second storage system in accord with the monitored operation. Therefore, the method ensures the consistency between the backup data and the data stored in the write-back cache of the first storage system, thereby increasing the security of the data.

Abstract: A method of protecting data in the cache memory of a storage system is used to protect the data stored in the cache memory of a first storage system and a second storage system coupled together and with the battery backed function. When the first storage system and the second storage system function normally, the data in their cache memory are mutually backed up. When any of the storage system has a power failure situation, the other normal storage system takes over the malfunctioned storage device. The data in its own cache memory are protected using the battery backed function. After the malfunctioned storage system restarts, the two storage systems keep backing up the data in the cache memory of each other. This provides a thorough protection of the data in the cache memory of the storage systems, increasing the reliability thereof.

Abstract: An automatic network connecting system includes a database, a data managing module, a user interface module and a responding module. The database stores user private data and network connection public data. The data managing module accesses the user private data and the network connection public data stored in the database. The user interface module provides at least one prompt to a user, so that the user can input a network service request according to the prompt in one touch. The responding module receives the network service request and accessing the user private data and the network connection public data stored in the database through the data managing module according to the network service request to complete the network service requested by the user automatically.