摘要:
The present invention relates to a vibration generating module and an actuator using the same, and more specifically, to an invention for generating vibration using an unstable structure, in which magnetic force is generated using permanent magnets and a solenoid for generating alternating electromagnetic force, and the vibration is generated by inertia or impact as the permanent magnets or the solenoid is moved by the generated magnetic force. To this end, disclosed is a vibration generating module comprising: a magnetic force generating means 110 for generating magnetic force; and an electromagnetic force generating means 120 for generating electromagnetic force alternating depending on a magnetic pole change signal, in which vibration is generated as the magnetic force generating means 110 or the electromagnetic force generating means 120 is moved to one direction according to the magnetic pole change signal.
摘要:
A shared key management method for a Supervisory Control And Data Acquisition (SCADA) system in which a master terminal unit (MTU), a plurality of sub master terminal units (SUB-MTUs), and a plurality of remote terminal units (RTUs) are configured in a sequential hierarchy, is provided. The method includes: (a) at the MTU, generating a plurality of secret keys and respectively allocating the secret keys to the RTUs; (b) at the MTU, generating a group key in a tree structure, wherein a leaf node of the tree structure corresponds to each RTU, a parent node of a node corresponding to an RTU corresponds to a SUB-RTU to which the RTU is connected, a shared key of each node of the group key is generated by hashing shared keys of all child nodes, and a shared key of a leaf node of the group key is set as a secret key of the RTU; (c) at the RTU or the SUM-MTU, receiving and storing shared keys of every node from a node corresponding to itself to a root node; (d) when the RTU or the SUM-MTU is added or deleted, at the MTU, generating shared keys of nodes along a path from a node corresponding to the added or deleted terminal unit to the root node again; and (e) at the RTU or the SUB-MTU, receiving and storing the generated shared keys. According to the key management method for the SCADA system described above, in the case of encrypting and broadcasting or multicasting a message, a computation amount can be reduced.
摘要:
A power cord cooling apparatus disposed in a cord reel chamber formed inside a main body of the vacuum cleaner to cool a power cord wound around a cord reel, wherein the power cord cooling apparatus allows outside air to enter the cord reel chamber, to contact the power cord wound around the cord reel, and to be discharged outside the cord reel chamber via a center space in the cord reel.
摘要:
A cyclone dust-separating apparatus includes a cyclone unit having air inflow and air outflow parts that separate dust or dirt from air, the cyclone unit being installed such that a longitudinal axis thereof is substantially horizontally arranged; a dust bin joined to a bottom end of the cyclone unit that collects the dust or dirt separated by the cyclone unit, the dust bin installed in such a manner that a longitudinal axis thereof is substantially perpendicular to the longitudinal axis of the cyclone unit; a nonporous envelope detachably disposed in the dust bin that stores the dust or dirt collected into the dust bin; and a pressure difference-generating passage to communicate an outlet of the air outflow part and the dust bin with each other so as to allow the nonporous envelope to come in contact with an inner surface of the dust bin by a pressure difference between the dust bin and the air outflow part.
摘要:
A solution and method for cleaning a silicon wafer following a chemical-mechanical polishing process is disclosed. The cleaning solution being 0.1% to 99% by total solution volume of phosphoric acid, 0.1% to 25% by total solution volume of fluoroboric acid, and the balance of the solution, deionized water.
摘要:
A cyclone dust-separating apparatus includes a cyclone unit having air inflow and air outflow parts that separate dust or dirt from air, the cyclone unit being installed such that a longitudinal axis thereof is substantially horizontally arranged; a dust bin joined to a bottom end of the cyclone unit that collects the dust or dirt separated by the cyclone unit, the dust bin installed in such a manner that a longitudinal axis thereof is substantially perpendicular to the longitudinal axis of the cyclone unit; a nonporous envelope detachably disposed in the dust bin that stores the dust or dirt collected into the dust bin; and a pressure difference-generating passage to communicate an outlet of the air outflow part and the dust bin with each other so as to allow the nonporous envelope to come in contact with an inner surface of the dust bin by a pressure difference between the dust bin and the air outflow part.
摘要:
A power cord cooling apparatus disposed in a cord reel chamber formed inside a main body of the vacuum cleaner to cool a power cord wound around a cord reel, wherein the power cord cooling apparatus allows outside air to enter the cord reel chamber, to contact the power cord wound around the cord reel, and to be discharged outside the cord reel chamber via a center space in the cord reel.