摘要:
Provided is a method of configuring a feedback zone in an uplink zone of a frame. This method is for transmitting feedback data in a wireless communication system. The method sets the feedback zone between a relay station (RS) and a mobile station (MS) in addition to a feedback zone between the MS and a base station (BS), thereby preventing a transmission delay of the feedback data incurred by the RS.
摘要:
A device for opening-closing sun visor of a helmet is disclosed. The device comprises a helmet body 10 provided in front with an opening portion 11 for the face and having a pair of hinge shafts 12 protruded on both the left and right sides, a sun visor 20 having a visor portion 21 placed on the side of the opening portion 11 of the helmet body 10, extending portions 22 extended to the left and right sides of the visor portion 21, and hinge slots 23 formed at the ends of the extending portions 22; and an opening-closing mechanism 30 having a slider 31 connected to the top center of the visor portion 21 of the sun visor 20, a guide rail 32 which is attached to the ceiling of the helmet body 10, and a guide holder 35 which is attached lengthwise to the top center of the helmet body.
摘要:
A small broadband monopole antenna including a shorted patch and a probe with a strip line that are electromagnetically coupled with each other. The probe with a strip line has a length of about λ/4, where λ is a wavelength. The strip line may be one of a spiral type, a folded type and a helix type. A resonance frequency of the antenna can be adjusted by varying the inductance and the capacitance of the resonance circuits. In addition, a double-band antenna or a single-band antenna having a broad bandwidth can be designed in accordance with application purpose of the antenna.
摘要:
A flow control method in an Ethernet switch being a downstream device using a full duplex mode in a packet switched network of the type having a plurality of input ports connected to a plurality of Ethernet switches being upstream devices and a common memory for storing packet data received from each input port and for transmitting packet data read from the common memory to a destination upstream device. In such flow control method, the buffer state of the common memory is first determined. If the buffer state is buffer-full, a pause frame including a predetermined pause time is transmitted to the plurality of Ethernet switches being upstream devices and an expected pause time of the upstream devices is counted. The buffer state of the common memory is determined again if the expected pause time expires. If the buffer state is buffer-full, the pause frame including the predetermined pause time is re-transmitted to the plurality of Ethernet switches being upstream devices and the expected pause time of the upstream devices is initiated.
摘要:
A coupling apparatus for a helmet shield includes a helmet and a shield that includes a left and right protruded inner portion, a curved rim protrusion, a cam shaped shaft portion having an engaging shaft flange at both sides of the rim protrusion and a guide pin shaft. A coupling apparatus includes a movable shaft member, base member and movable shaft member spring that is assembled to the back surface of the base member. The movable shaft member spring includes one end engaged to a spring engaging ring of the movable shaft member and the other end supported by the base member for thereby returning the movable shaft member, wherein the cam shaped shaft portion of the shield is rotatable in the movable shaft member, and the movable shaft member is slide-movable in the concave portion of the base member in a forward and backward direction.
摘要:
A personal computer system capable of preventing unauthorized user's access by way of a chip-in card including a card read and write unit for detecting the insertion or ejection of the chip-in card; a card read and write controller for generating an interrupt in response to the insertion or ejection of the chip-in card; at least one input means for allowing the user to input commands and information to gain access to the computer; and a host controller responsive to the interrupt from the card read and write controller, for preventing the input of commands and/or information from the input means, when the chip-in card is ejected, but allowing input of commands and information from the input means, when the chip-in card is inserted in position of the card read and write unit. Accordingly, the personal computer system can be controlled so that access to the computer or designated program cannot be realized without a personal identification card, while other unrestricted programs can be executed during the control of the computer system in order to increase its operation efficiency.
摘要:
Provided are an apparatus and method for transmitting multi-carriers to provide a high-quality service to multicast-based service subscriber terminals. The method includes: mapping first data for providing the multicast service, and second data different from the first data, to different antennas; converting the first mapped data into a first Intermediate Frequency (IF) signal and the second mapped data into a second IF signal; converting the first IF signal into a first RF signal having a carrier frequency, and deciding a power intensity of the first RF signal so that the first RF signal is transmitted over the entire coverage region of the base station; and converting the second IF signal into a second RF signal having the other carrier frequency, and deciding a power intensity of the second RF signal so that the second RF signal is transmitted over a predetermined region around the base station.
摘要:
The present invention relates to an IPTV service device and method for providing continuous service. The method according to one embodiment of the present invention comprises: a service-request receiving step of receiving an IPTV service request from a user of an IPTV terminal; a service-confirming step of confirming whether or not the IPTV service has previously been stopped in response to the IPTV service request; and an IPTV-service providing step of providing the IPTV service to the IPTV terminal from the point at which service was stopped if the IPTV service has previously been stopped.
摘要:
In a method for detecting a signal in a multi-input multi-output wireless communication system that receives signals transmitted through a plurality of transmission antennas by using a plurality of reception antennas, a detection order for detecting the transmission signals received through the reception antennas is determined on the basis of a cofactor determinant of components constituting a channel matrix representing characteristics of channels between the transmission antennas and the reception antennas. In addition, the transmission signal is detected from the signals received through the reception antennas in accordance with the determined detection order.
摘要:
Provided is a method and apparatus for determining timing for initial ranging of user equipment by using ranging of adjacent pieces of user equipment in a multi-hop mobile relay (MMR) system, and more particularly, a method and apparatus for determining timing for initial ranging of user equipment in which a power value and a timing value for periodic ranging of adjacent pieces of user equipment are measured so as to minimize an uplink timing error of a base station. In the MMR system, user equipment transmits an initial ranging code to the base station with irregular timing while not knowing an exact start point of an uplink of the base station. In particular, if the user equipment attempts the initial ranging at the same time as when adjacent pieces of user equipment attempt the periodic ranging and the handover ranging, an error occurs between transmission timing of the initial ranging and uplink timing, thereby acting as an inter-symbol interference (ISI) and inter-channel interference (ICI) of different ranging. As a result, the initial ranging acts as an interference signal in a ranging process of adjacent pieces of user equipment. However, the apparatus and method can minimize a timing error of the initial ranging code of user equipment by avoiding the initial ranging acting as the interference signal.