Abstract: Described are methods and devices for communication between local networks and global networks. In some examples, a method comprises storing mapping data for multiple hosts in a global network and in a local network. The method further comprises receiving a first data packet from one of the multiple hosts in the local network. The first data packet comprises a first source address being the local network address of the host in the local network, a first destination address being the local network address of the host in the global network and payload data. The method further comprises determining, based on the mapping data, the global network address of the host in the local network and a global network address of the host in the global network, and sending a second data packet over the global network.

Abstract: A small-sized fast cold and hot shock test device is provided. The device includes a host, a test head used for cold and hot shock to a component under test by temperature control and output of compressed air, and an adjustment device for adjusting a position of the test head. The host includes a control device at least used to send temperature control data to the test head. The test head includes an eddy current mechanism for cooling or heating the compressed air, a heater including an air inlet end and an air outlet end, and a nozzle. The eddy current mechanism includes an air inlet, a cold air outlet, and a hot air outlet. The air inlet is connected with an air supply system through an intake air line unit. The cool air outlet is connected with the air inlet end of the heater.

Abstract: A small-sized fast cold and hot shock test device is provided. The device includes a host, a test head used for cold and hot shock to a component under test by temperature control and output of compressed air, and an adjustment device for adjusting a position of the test head. The host includes a control device at least used to send temperature control data to the test head. The test head includes an eddy current mechanism for cooling or heating the compressed air, a heater including an air inlet end and an air outlet end, and a nozzle. The eddy current mechanism includes an air inlet, a cold air outlet, and a hot air outlet. The air inlet is connected with an air supply system through an intake air line unit. The cool air outlet is connected with the air inlet end of the heater.

Abstract: The present disclosure provides an small-sized fast cold and hot shock test device. The device includes a host, a test head used for cold and hot shock to a component under test by temperature control and output of compressed air, and an adjustment device for adjusting a position of the test head. The host includes a control device at least used to send temperature control data to the test head. The test head includes an eddy current mechanism for cooling or heating the compressed air, a heater including an air inlet end and an air outlet end, and a nozzle. The eddy current mechanism includes an air inlet, a cold air outlet, and a hot air outlet. The air inlet is connected with an air supply system through an intake air line unit. The cool air outlet is connected with the air inlet end of the heater. The nozzle is connected with the air outlet end of the heater.

Abstract: The present disclosure provides an small-sized fast cold and hot shock test device. The device includes a host, a test head used for cold and hot shock to a component under test by temperature control and output of compressed air, and an adjustment device for adjusting a position of the test head. The host includes a control device at least used to send temperature control data to the test head. The test head includes an eddy current mechanism for cooling or heating the compressed air, a heater including an air inlet end and an air outlet end, and a nozzle. The eddy current mechanism includes an air inlet, a cold air outlet, and a hot air outlet. The air inlet is connected with an air supply system through an intake air line unit. The cool air outlet is connected with the air inlet end of the heater. The nozzle is connected with the air outlet end of the heater.

Abstract: Described are methods and devices for communication between local networks and global networks. In some examples, a method comprises storing mapping data for multiple hosts in a global network and in a local network. The method further comprises receiving a first data packet from one of the multiple hosts in the local network. The first data packet comprises a first source address being the local network address of the host in the local network, a first destination address being the local network address of the host in the global network and payload data. The method further comprises determining, based on the mapping data, the global network address of the host in the local network and a global network address of the host in the global network, and sending a second data packet over the global network.

Abstract: A method (100) for block generation in a distributed ledger is presented. Each client device of a plurality of client devices (302) to (308) defines an associated battery (200). Each battery (200) comprises a proof-of-work (PoW) (202) and a unique identifier (204) of the associated client device. Each of the plurality of client devices (302) to (308) broadcasts the associated battery (200) to a plurality of nodes that maintain the distributed ledger. The plurality of nodes record the battery in the distributed ledger and select, via a battery selection algorithm, a first battery associated with a first client device to generate a new block in the distributed ledger. The first client device generates the new block using the first battery.

Abstract: This disclosure concerns homomorphic encryption for database querying. Numerical values are encrypted using keys and random numbers to produce a ciphertext. The ciphertext is homomorphic and is comprised of two or more sub-ciphertexts. Queries based on addition, average and multiplication operations can be performed without decrypting the numerical values relevant to the query. Each sub-ciphertext is stored in a single record and in separate attributes. There is disclosed methods of encrypting and decrypting, creating a suitable table, querying such a database and updating such a database.

Abstract: This disclosure concerns homomorphic encryption for database querying. Numerical values (FIG. 5) are encrypted using keys (FIG. 6) and random numbers (FIG. 7) to produce a ciphertext. The ciphertext is homoporhic and is comprised of two or more sub-ciphertexts (FIG. 8). Queries based on addition (FIG. 10), average (FIG. 11) and multiplication operations can be performed without decrypting the numerical values relevant to the query. Each sub-ciphertext (FIG. 8) is stored in a single record and in separate attributes. There is disclosed methods of encrypting (402) and decrypting, creating a suitable table (400), querying such a database (412) and updating such a database (408, 410).