Abstract: A method for manufacturing a waterproof felt duct may include (a) laminating a waterproof film on one side of a first nonwoven fabric and laminating a second nonwoven fabric on the waterproof film laminated on the first nonwoven fabric to form a laminated body; (b) forming a waterproof felt base material by thermally adhering the laminated body; (c) cutting the waterproof felt base material into a desired shape; (d) molding a duct while surrounding the waterproof felt base material cut into the desired shape around the external surface of a molding jig having a worm gear shape; (e) heat-treating the molded duct; (f) cooling the heat-treated duct; and (g) ejecting the cooled duct from the molding jig.

Abstract: A method for manufacturing a waterproof felt duct may include (a) laminating a waterproof film on one side of a first nonwoven fabric and laminating a second nonwoven fabric on the waterproof film laminated on the first nonwoven fabric to form a laminated body; (b) forming a waterproof felt base material by thermally adhering the laminated body; (c) cutting the waterproof felt base material into a desired shape; (d) molding a duct while surrounding the waterproof felt base material cut into the desired shape around the external surface of a molding jig having a worm gear shape; (e) heat-treating the molded duct; (f) cooling the heat-treated duct; and (g) ejecting the cooled duct from the molding jig.

Abstract: A beacon scheduling method in multi-hop ad-hoc communications is provided. This method can prevent overhead in a manner that a base station (BS) transmits beacon slot information to a carrier sense multiple access (CSMA)/collision avoidance (CA) node (CN) and a gateway (GW) through contention-free time division multiple access (TDMA) communications at initial clustering, the CN and the GW performs a sequential clustering to forward the beacon slot information to a cluster head (CH), the CH aggregates joining messages from nodes and assigns non-colliding beacon slots to the nodes, and the GW uses a beacon slot frame of a beacon transmission period (BTP) used by its selected CH in a beacon reply period (BRP) as well. Accordingly, the CH does not need to separately perform the initialization to elect the beacon slot, and the GW also does not require a separate initialization to select the beacon relay slot.

Abstract: A Universal Serial Bus (USB) device includes an internal circuit and an interface circuit. The interface circuit is configured to interface the internal circuit and an external device for wireless USB (WUSB) communication and USB communication. The interface circuit includes a WUSB module enabling the WUSB communication, an on-the-go (OTG) module enabling the USB communication, and an interface module configured to selectively control the WUSB module and the OTG module to interface the internal circuit and the external device for the WUSB communication and the USB communication.

Abstract: A Viterbi decoder for executing a trace-back work in parallel and a decoding method.

Abstract: A wireless communication method in a network environment in which several devices are connected and wireless communications are performed through a channel synchronized by a sync signal that is broadcast from a piconet coordinate (PNC) selected among the several devices. The wireless communication method includes classifying a first frame to be transmitted to a first device among the several devices into a predetermined number of classes, calculating a waiting time before backoff depending on the classes, and determining whether the channel is used by any other device during the calculated waiting time, calculating a backoff time according to the classes and performing the backoff during the calculated backoff time, if the channel is idle during the waiting time, and transmitting the first frame when the backoff time ends. By adapting the priority to the CAP of the superframe, the control information is quickly conveyed and a high rate wireless communication is realized.

Abstract: A Universal Serial Bus (USB) device includes an internal circuit and an interface circuit. The interface circuit is configured to interface the internal circuit and an external device for wireless USB (WUSB) communication and USB communication. The interface circuit includes a WUSB module enabling the WUSB communication, an on-the-go (OTG) module enabling the USB communication, and an interface module configured to selectively control the WUSB module and the OTG module to interface the internal circuit and the external device for the WUSB communication and the USB communication.

Abstract: A data slot allocation method allowing a plurality of devices in a wireless personal area network (WPAN) to satisfy the required QoS condition for the data stream transmission. The method includes allocating a specific number of data slots of a superframe to the plurality of the devices based on the QoS information; additionally allocating a certain number of data slots to a first device when the first device transmitting a data stream is allocated data slots less than a number of required data slots for the data stream transmission; and reserving the additional data slots for the first device by reducing a number of data slots to be allocated to the other devices, excluding the first device. Accordingly, the data slots can be fairly distributed to the devices.

Abstract: An apparatus and method of receiving and transmitting data in a wireless local network is provided. An apparatus for receiving data in a wireless local network includes: a congestion determiner which determines whether there is a congestion in a buffer storing received data if the data is received via a prioritized contention access (PCA) period; and a congestion information transmitter which transmits, in the PCA period or a beacon period (BP), congestion generation information in a medium access control (MAC) frame or a beacon frame if there is the congestion in the buffer.

Abstract: A contention reduction apparatus and method in a prioritized contention access (PCA) method of a Wireless Personal Area Network are provided. A contention reduction apparatus of a Wireless Personal Area Network includes: a prioritized contention access (PCA) section retriever which retrieves a PCA section from beacons received for a beacon period (BP); a PCA section divider which divides the retrieved PCA section; a device selector which selects devices using the PCA section; and a PCA section allocator which allocates the divided PCA section to the selected devices.

Abstract: An apparatus and method of merging beacons in a wireless local network are provided. The method of merging beacons in a wireless local network includes: calculating a continuous occurrence frequency of a received alien beacon period (BP); comparing the calculated occurrence frequency with a certain reference occurrence frequency; and merging a beacon group of a corresponding device with an alien beacon group when the calculated occurrence frequency is greater than or equal to the reference occurrence frequency.

Abstract: An apparatus for preventing a device address from conflicting in a WiMedia media access control (MAC), the apparatus including: a device address conflict determination unit which determines whether a conflict between a device address of the apparatus and alien device addresses included in a received alien beacon occurs; a device address generation unit which regenerates the device address of the apparatus when the conflict occurs and a beacon group of the apparatus is not a reference beacon group; a device address information generation unit which generates information about the regenerated device address of the apparatus; and a device information update unit which updates device information of the beacon group of the apparatus, when a beacon including information about a regenerated device address of the apparatus is received from another device included in the beacon group of the apparatus.

Abstract: A beacon scheduling method in multi-hop ad-hoc communications is provided. This method can prevent overhead in a manner that a base station (BS) transmits beacon slot information to a carrier sense multiple access (CSMA)/collision avoidance (CA) node (CN) and a gateway (GW) through contention-free time division multiple access (TDMA) communications at initial clustering, the CN and the GW performs a sequential clustering to forward the beacon slot information to a cluster head (CH), the CH aggregates joining messages from nodes and assigns non-colliding beacon slots to the nodes, and the GW uses a beacon slot frame of a beacon transmission period (BTP) used by its selected CH in a beacon reply period (BRP) as well. Accordingly, the CH does not need to separately perform the initialization to elect the beacon slot, and the GW also does not require a separate initialization to select the beacon relay slot.

Abstract: A Viterbi decoder for executing a trace-back work in parallel and a decoding method.

Abstract: A data slot allocation method allowing a plurality of devices in a wireless personal area network (WPAN) to satisfy the required QoS condition for the data stream transmission. The method includes allocating a specific number of data slots of a superframe to the plurality of the devices based on the QoS information; additionally allocating a certain number of data slots to a first device when the first device transmitting a data stream is allocated data slots less than a number of required data slots for the data stream transmission; and reserving the additional data slots for the first device by reducing a number of data slots to be allocated to the other devices, excluding the first device. Accordingly, the data slots can be fairly distributed to the devices.

Abstract: A method of transferring a TCP stream in a Personal Area Network (PAN) synchronized with a synchronous signal broadcasted from a coordinator, including: transmitting to the coordinator, via a first device at a sending side desiring to send the TCP stream among plural devices linked to the PAN, a channel time request command including information that a stream to be used is a TCP stream to request a channel time allocation; allocating, via the coordinator by referring to the channel time request command, a channel time corresponding to the channel time requested by the first device; inserting information on the allocated channel time into the synchronous signal broadcast to the first device and a second device at a receiving side; and transmitting the TCP data from the first device to the second device and transmitting a TCP acknowledgement (ACK) from the second device to the first device upon receipt of the TCP data, the transmitting and receiving being in the allocated channel time inserted into the synchron

Abstract: A wireless communication method in a network environment in which several devices are connected and wireless communications are performed through a channel synchronized by a sync signal that is broadcast from a piconet coordinate (PNC) selected among the several devices. The wireless communication method includes classifying a first frame to be transmitted to a first device among the several devices into a predetermined number of classes, calculating a waiting time before backoff depending on the classes, and determining whether the channel is used by any other device during the calculated waiting time, calculating a backoff time according to the classes and performing the backoff during the calculated backoff time, if the channel is idle during the waiting time, and transmitting the first frame when the backoff time ends. By adapting the priority to the CAP of the superframe, the control information is quickly conveyed and a high rate wireless communication is realized.