Abstract: A lock electronically controls whether the battery box can be removed or not and has a base and a battery box. A first base latch seat of the base has an electronic controller and a latching member. The battery box is detachably mounted on the base. The latching member is movable or rotatable to engage with the first battery latch seat of the battery box. The latching member is moveable or rotatable to disengage from the first battery latch seat under the control of the electronic controller. The latching member on the base regularly engages with the first battery latch seat. To unlock the battery box, it is only necessary to control the electronic controller by signal, and then the latching member on the base may be disengaged from the first battery latch seat, so that the battery box can be removed.

Abstract: The present disclosure provides an optical element driving mechanism, which includes a first movable part, a fixed assembly, a first driving assembly, a second movable part, a second driving assembly and a locking assembly. The first movable part is configured to connect an optical element. The first movable part is movable relative to the fixed assembly. The first driving assembly is configured to drive the first movable part to move relative to the fixed assembly, and the second driving assembly is configured to drive the second movable part to move relative to the first movable part and the fixed assembly. The locking assembly is configured to fix the first movable part at a first position relative to the fixed assembly.

Abstract: Methods and systems for providing generalized link adaptation in an orthogonal frequency-division multiple access wireless communications network can include determining a number of desired resource blocks (RBs) for each user of a plurality of users; calculating a maximal channel gain Gm for each RB of a plurality of RBs; reordering the plurality of RBs based on the Gm; assigning one of the plurality of RBs to the plurality of users one-by-one according to the reordering of the plurality of RBs; determining a priority list for assigning remaining unassigned RBs; assigning the remaining unassigned RBs to the plurality of users based on the priority list; and mapping a symbol or a packet to each assigned RB.

Abstract: Methods and systems for providing generalized link adaptation in an orthogonal frequency-division multiple access wireless communications network can include determining a number of desired resource blocks (RBs) for each user of a plurality of users; calculating a maximal channel gain Gm for each RB of a plurality of RBs; reordering the plurality of RBs based on the Gm; assigning one of the plurality of RBs to the plurality of users one-by-one according to the reordering of the plurality of RBs; determining a priority list for assigning remaining unassigned RBs; assigning the remaining unassigned RBs to the plurality of users based on the priority list; and mapping a symbol or a packet to each assigned RB.