Abstract: A perforation device is disclosed. The perforation device perforating a battery module includes a loading unit configured to convey and load the battery module in a longitudinal direction, a fixing unit configured to fix the battery module, and a perforation unit configured to approach the battery module and perforate the battery module. When the perforation unit approaches the battery module, the fixing unit contacts the battery module on an opposite side of the perforation unit with respect to the battery module and suppresses a movement of the battery module.

Abstract: Provided is a pretreatment container for discharging of a secondary battery used in the process of processing discharging of a secondary battery, in which a first upper plate and a second upper plate are rotatably disposed in a staggered manner on an upper side of a housing including a receiving space receiving a waste battery, thereby preventing the waste battery from floating during the discharging process.

Abstract: A brake booster is provided. The brake booster includes a poppet valve body configured to open a path for atmospheric pressure to be introduced into a variable pressure chamber by an operation rod linked with a brake pedal, and a return spring structure disposed on an outer side of the poppet valve body and configured to adjust an elastic force provided to the poppet valve body when an input of the brake pedal is released.

Abstract: A brake booster is provided. The brake booster includes a poppet valve body configured to open a path for atmospheric pressure to be introduced into a variable pressure chamber by an operation rod linked with a brake pedal, and a return spring structure disposed on an outer side of the poppet valve body and configured to adjust an elastic force provided to the poppet valve body when an input of the brake pedal is released.

Abstract: A reservoir tank of a brake master cylinder, in which the reservoir tank includes a reservoir body to store oil therein, the reservoir body being provided with an oil introduction port, a filter interrupted by a fixing step arranged at a lower portion of the oil introduction port, and a reservoir cap arranged at an upper portion of the oil introduction port, wherein a vent member is provided between the fixing step and the filter, to allow inflow of air through during introduction of oil.

Abstract: Disclosed herein is a pressure damping device for a brake system which may reduce pressure pulsations generated by a piston pump. The pressure damping device is installed at a brake system having a hydraulic block provided with a first hydraulic circuit to control transfer of fluid pressures generated at a first port of a master cylinder and discharged from a first pump, and a second hydraulic circuit to control transfer of fluid pressures generated by a second port of the master cylinder and discharged from a second pump. The hydraulic block is provided with a bore connecting the master cylinder with a discharge outlet of each of the pumps and formed between main oil channels. The pressure damping device is provided in the bore, has a changeable volume, and includes a stopper member and a damping member. The damping member includes a ring-shaped elastic member and a plate.

Abstract: Disclosed herein is a reservoir tank of a brake master cylinder. The reservoir tank includes a reservoir body to store oil therein, the reservoir body being provided with an oil introduction port, a filter interrupted by a fixing step arranged at a lower portion of the oil introduction port, and a reservoir cap arranged at an upper portion of the oil introduction port, wherein a vent member is provided between the fixing step and the filter, to allow inflow of air through during introduction of oil.

Abstract: A method and apparatus for notifying status of an MN in a WLAN system using VLC are provided, in which an AP allocates a first predetermined number of time slots per frame as unallocated slots, for status notification of an initially accessing MN and allocates a second predetermined number of time slots per frame as reserved slots, for status notification of an initially accessing MN and uplink data transmission of an MN, and the MN transmits a visible light signal carrying status information about the MN in one of an unallocated slot and a reserved slot, if the MN initially accesses the AP.

Abstract: Apparatuses and methods for processing a bandwidth request in a multihop relay Broadband Wireless Access (BWA) communication system are provided. A communication method of a Relay Station (RS) includes determining a number of bandwidth request ranging codes received from Subscriber Stations (SSs); and reporting the number of the bandwidth request ranging codes to a Base Station (BS). A communication method of the BS includes allocating a resource to an RS to report on a number of detected bandwidth request ranging codes; and receiving a report on the number of the bandwidth request ranging codes using the allocated resource.

Abstract: A method for retransmitting data when data transmission/reception has failed in a wireless LAN system using visible light communication. A mobile node searches a received frame for a fast feedback slot allocated for retransmission information when momentary data transmission/reception failure has occurred. One mini-slot from among the plurality of mini-slots is selected from the fast feedback slot. The mobile node transmits a fast feedback message, including information for retransmission, to an access point by using the selected mini-slot.

Abstract: Provided are an ARQ apparatus and method for a multihop system in a broadband wireless access communication system. The ARQ method of a relay includes determining if the relay successfully receives specific data from a source and transmitting the specific data to a destination; receiving feedback data from the destination and determining if the destination successfully receives the specific data; generating feedback data including data indicating if the relay and the destination successfully receive the specific data, and outputting the feedback data to the source; and retransmitting the specific data, when the relay successfully receives the specific data but the destination fails to receive the specific data. Accordingly, when the MH-BTS successfully receives the data from the source but the destination fails to receive the data, the source does not retransmit same data to the MH-BTS.

Abstract: Provided is an apparatus and method for determining a data transmission rate in consideration of the queue length of a Relay Station RS in a multi-hop relay system. A Base Station BS apparatus of the multi-hop relay system includes a receiver and a calculator. The receiver receives channel condition information and queue length information for a Mobile Station MS from an RS. The calculator of the BS apparatus determines a data transmission rate between the BS and the RS for data of the MS using the channel condition information and the queue length information.

Abstract: Disclosed herein are a method of communicating and establishing a relay channel between a base station and a non-line-of-sight channel terminal in a next generation cellular communication system.

Abstract: Provided is a multi-hop wireless mobile communication system where a plurality of nodes exist. To select a serving node to be provided with a service, a Mobile Station (MS) receives relay information provided for serving node selection from at least two nodes and selects a first mode of selecting a node that requires the minimum time for unit data transmission/reception as the serving node or a second mode of selecting a node that can transmit and receive the maximum data per unit time as the serving node, based on the received relay information, in order to select the serving node.

Abstract: A method for retransmitting data when data transmission/reception has failed in a wireless LAN system using visible light communication. A mobile node searches a received frame for a fast feedback slot allocated for retransmission information when momentary data transmission/reception failure has occurred. One mini-slot from among the plurality of mini-slots is selected from the fast feedback slot. The mobile node transmits a fast feedback message, including information for retransmission, to an access point by using the selected mini-slot.

Abstract: A method and apparatus for notifying status of an MN in a WLAN system using VLC are provided, in which an AP allocates a first predetermined number of time slots per frame as unallocated slots, for status notification of an initially accessing MN and allocates a second predetermined number of time slots per frame as reserved slots, for status notification of an initially accessing MN and uplink data transmission of an MN, and the MN transmits a visible light signal carrying status information about the MN in one of an unallocated slot and a reserved slot, if the MN initially accesses the AP.

Abstract: Apparatuses and methods for processing a bandwidth request in a multihop relay Broadband Wireless Access (BWA) communication system are provided. A communication method of a Relay Station (RS) includes determining a number of bandwidth request ranging codes received from Subscriber Stations (SSs); and reporting the number of the bandwidth request ranging codes to a Base Station (BS). A communication method of the BS includes allocating a resource to an RS to report on a number of detected bandwidth request ranging codes; and receiving a report on the number of the bandwidth request ranging codes using the allocated resource.

Abstract: Provided is an apparatus and method for determining a data transmission rate in consideration of the queue length of a Relay Station RS in a multi-hop relay system. A Base Station BS apparatus of the multi-hop relay system includes a receiver and a calculator. The receiver receives channel condition information and queue length information for a Mobile Station MS from an RS. The calculator of the BS apparatus determines a data transmission rate between the BS and the RS for data of the MS using the channel condition information and the queue length information.

Abstract: Provided are an ARQ apparatus and method for a multihop system in a broadband wireless access communication system. The ARQ method of a relay includes determining if the relay successfully receives specific data from a source and transmitting the specific data to a destination; receiving feedback data from the destination and determining if the destination successfully receives the specific data; generating feedback data including data indicating if the relay and the destination successfully receive the specific data, and outputting the feedback data to the source; and retransmitting the specific data, when the relay successfully receives the specific data but the destination fails to receive the specific data. Accordingly, when the MH-BTS successfully receives the data from the source but the destination fails to receive the data, the source does not retransmit same data to the MH-BTS.

Abstract: Provided is a multi-hop wireless mobile communication system where a plurality of nodes exist. To select a serving node to be provided with a service, a Mobile Station (MS) receives relay information provided for serving node selection from at least two nodes and selects a first mode of selecting a node that requires the minimum time for unit data transmission/reception as the serving node or a second mode of selecting a node that can transmit and receive the maximum data per unit time as the serving node, based on the received relay information, in order to select the serving node.