Abstract: The federated learning system includes a moderator and client devices. Each client device performs a method for verifying model update as follows: receiving a hash function and a general model; training a client model according to the general model and raw data; calculating a difference as an update parameter between the general model and the client model, sending the update parameter to the moderator; inputting the update parameter to the hash function to generate a hash value; sending the hash value to other client devices, and receiving other hash values; summing all the hash values to generate a trust value; receiving an aggregation parameter calculated according to the update parameters; inputting the aggregation parameter to the hash function to generate a to-be-verified value; and updating the client model according to the aggregation parameter when the to-be-verified value equals the trust value.

Abstract: Provided are vaccine compositions and methods for generation of immune response (including neutralizing antibodies) against SARS-CoV-2 virus. The vaccine compositions comprise a poly-histidine tagged receptor binding domain (RBD) of the SARS-CoV-2 virus incorporated into a liposome comprising cobalt-porphyrin-phospholipid conjugates, such that one or more histidines of the polyhistidine tag are coordinated to the cobalt of the cobalt-porphyrin and at least a portion of the RBD is exposed to the outside of the liposome.

Abstract: A connector and printed circuit board assembly includes a printed circuit board, a connector fixed on the printed circuit board, and a fixing board fixed on the connector, the fixing board defining a through hole, a connecting member fixed on the printed circuit board adjacent to the connector, a threaded retainer, and a threaded post securely connected with the connecting member. The threaded post passes through the through hole and seats the threaded retainer to lock the connector onto the printed circuit board.

Abstract: A connector and printed circuit board assembly includes a printed circuit board, a connector fixed on the printed circuit board, and a fixing board fixed on the connector, the fixing board defining a through hole, a connecting member fixed on the printed circuit board adjacent to the connector, a threaded retainer, and a threaded post securely connected with the connecting member. The threaded post passes through the through hole and seats the threaded retainer to lock the connector onto the printed circuit board.

Abstract: A server rack for receiving a plurality of modules includes two parallel side plates, a clapboard, and a baffle device. The clapboard is disposed between the two side plates substantially perpendicular to the two side plates to form a receiving space. The receiving space defines an air inlet and a module entry opposite to the air inlet. The baffle device is received in the receiving space. The baffle device includes two resisting assemblies installed on the two side plates oppositely. Each resisting assembly includes a baffle. The baffle includes a securing portion and a latching portion opposite to the securing portion. The securing portion of each baffle is rotatably secured on the corresponding side plate. A total length of the two baffles is larger than the width of the receiving space. The two baffles are inclined toward the air inlet. The two latching portions of the two baffles are latched facing the air inlet, to cover the module entry when no module is received in the receiving space.

Abstract: A protecting apparatus includes a receiving box for receiving a solid state drive, and a cover pivotably connected to the receiving box. The receiving box includes a base. Two feet protrude down from a bottom of the base for fixing the receiving box to a motherboard. A through hole is defined in the base for allowing a connector of the motherboard to extend into the receiving box to electrically connect to the solid state drive. The protecting apparatus can protect the solid state drive from knock and loose.

Abstract: An exemplary fixing apparatus is for mounting a hard disk drive (HDD) having a plurality of holes defined in sidewalls thereof. The fixing apparatus includes a first side plate, a bracket, and a bezel assembly. The first side plate includes a first pivoting portion, and a second pivoting portion formed near and at one end thereof respectively. The bracket includes a second side plate, and a transverse member perpendicular to the second side plated. The transverse member is pivotably attached to the first pivoting portion. The bezel assembly is pivotably attached to the second pivoting portion. The bezel assembly includes a latch bar having a wedged block. The transverse member includes a positioning plate to detachably engage with the wedged block. The first and second side plates include a plurality of fixing members to engage in the holes of the disk drive, respectively.

Abstract: An exemplary fixing apparatus is for mounting a hard disk drive (HDD) having a plurality of holes defined in sidewalls thereof. The fixing apparatus includes a first bracket, and a second bracket. The first bracket includes a side plate, and a transverse member perpendicular to the side plate. The second bracket includes a side plate, and a transverse member perpendicular to the side plate. A free end of the transverse member of the second bracket pivotably engages with the transverse member of the first bracket. A free end of the transverse member of the first bracket is detachably locked to the transverse member of the second bracket. The side plates of the first bracket and the second bracket include a plurality of fixing members attached thereto to engage in the holes of the disk drive, respectively.

Abstract: An exemplary fixing apparatus is for mounting a hard disk drive (HDD) having a plurality of holes defined in sidewalls thereof. The fixing apparatus includes a first bracket, a second bracket, and a bezel assembly. The first bracket includes a side plate, an end plate perpendicularly extending from one end of the side plate, and a pivoting portion formed at the other end of the side plate. The second bracket includes a side plate, an end plate perpendicularly extending from one end of the side plate to pivotably engage with the end plate of the first bracket, and an extension portion formed at the other end of the side plate. The bezel assembly is pivotably attached to the pivoting portion of the first bracket and detachably locked with the extension portion of the second bracket. The side plates include a plurality of fixing members to engage in the holes of the disk drive, respectively.

Abstract: An exemplary fixing apparatus is for mounting a hard disk drive (HDD) having a plurality of holes defined in sidewalls thereof. The fixing apparatus includes a first bracket, and a second bracket. The first bracket includes a side plate, and a transverse member perpendicular to the side plate. The second bracket includes a side plate, and a transverse member perpendicular to the side plate. A free end of the transverse member of the second bracket pivotably engages with the transverse member of the first bracket. A free end of the transverse member of the first bracket is detachably locked to the transverse member of the second bracket. The side plates of the first bracket and the second bracket include a plurality of fixing members attached thereto to engage in the holes of the disk drive, respectively.

Abstract: An exemplary fixing apparatus is for mounting a hard disk drive (HDD) having a plurality of holes defined in sidewalls thereof. The fixing apparatus includes a first bracket, a second bracket, and a bezel assembly. The first bracket includes a side plate, an end plate perpendicularly extending from one end of the side plate, and a pivoting portion formed at the other end of the side plate. The second bracket includes a side plate, an end plate perpendicularly extending from one end of the side plate to pivotably engage with the end plate of the first bracket, and an extension portion formed at the other end of the side plate. The bezel assembly is pivotably attached to the pivoting portion of the first bracket and detachably locked with the extension portion of the second bracket. The side plates include a plurality of fixing members to engage in the holes of the disk drive, respectively.

Abstract: An exemplary fixing apparatus is for mounting a hard disk drive (HDD) having a plurality of holes defined in sidewalls thereof. The fixing apparatus includes a first side plate, a bracket, and a bezel assembly. The first side plate includes a first pivoting portion, and a second pivoting portion formed near and at one end thereof respectively. The bracket includes a second side plate, and a transverse member perpendicular to the second side plated. The transverse member is pivotably attached to the first pivoting portion. The bezel assembly is pivotably attached to the second pivoting portion. The bezel assembly includes a latch bar having a wedged block. The transverse member includes a positioning plate to detachably engage with the wedged block. The first and second side plates include a plurality of fixing members to engage in the holes of the disk drive, respectively.