Abstract: Provided are a method of fabricating a microlens using selective etching of a compound semi-conductor and a method of fabricating a photoelectric device having the microlens. The formation of the microlens includes patterning a compound semiconductor layer and removing a lateral surface of the compound semiconductor layer to form a roughly hemispheric lens. The lateral surface of the compound semiconductor layer is removed by a digital alloy method. In particular, the lateral surface of the compound semiconductor layer is removed by a wet etching process.

Abstract: A routing method in consideration of the power and transmission delay in a wireless ad hoc network and a terminal device adopting the same are provided, which can reduce the power consumption and packet delay by considering both the power consumption and packet delay. The terminal device includes a judgment unit that determines whether a first accumulative hop count included in a first route request (RREQ) packet exceeds a predetermined route decision value for limiting a hop count from a source node to a destination node, and a control unit that determines a route to the source node, based on information included in the first RREQ packet, if the judgment unit determines that the first accumulative hop count does not exceed the route decision value.

Abstract: A high throughput apparatus for multiple sample analysis is disclosed. The high throughput apparatus for multiple sample analysis may include: a laser light source; a lens array configured to focus laser irradiated by the laser light source into a plurality of focused laser beams; and a focusing unit disposed between the lens array and a sample, the focusing unit configured to focus ions produced from the sample by the plurality of focused laser beams into a plurality of ion beams. A high throughput method for multiple sample analysis may include: producing a plurality of focused laser beams by focusing laser; ionizing a sample by irradiating the plurality of focused laser beams to the sample; and producing a plurality of ion beams by focusing ions, wherein the ions are produced from the sample by the plurality of focused laser beams.

Abstract: A communication system capable of improving a TCP transmission efficiency includes a transmitter for transmitting data packets; a receiver connected to the transmitter, and for receiving the data packets and transmitting to the transmitter response signals with respect to the received data packets; and a multiplexer for multiplexing and transmitting to the transmitter the response signals transmitted from the receiver, and transmitting the transmitted data packets from the transmitter to a corresponding receiver, the multiplexer provided with a queue status monitor for monitoring queue statuses of the transmitted data packets and/or response signals, and a congestion control adjuster instructing the receiver to hold or compress the response signals based on the monitored queue status. Accordingly, the communication system can carry out efficient TCP congestion control by reducing a load of the TCP congestion control of the transmitters and receivers.

Abstract: A wireless communication method according to the present invention, in a Bluetooth device connected to multiple piconets and operating in a scatter mode, includes steps of (a) establishing credit values by link for the multiple piconets, and the total sum of the credit values by link as a temporary account value; (b) updating the credit values by link and the temporary account value every slot based on a predetermined manner; (c) performing communications through a link selected based on a comparison result of the credit values by link at each Presence Point(PP); and (d) unevenly redistributing predetermined credit values based on characteristics by link and returning to the step (b) in one of the two cases in which the communications are interrupted with a POLL_NULL sequence and the temporary account value becomes the same as the total number, n, of links.

Abstract: Provided are a method of fabricating a microlens using selective etching of a compound semi-conductor and a method of fabricating a photoelectric device having the microlens. The formation of the microlens includes patterning a compound semiconductor layer and removing a lateral surface of the compound semiconductor layer to form a roughly hemispheric lens. The lateral surface of the compound semiconductor layer is removed by a digital alloy method. In particular, the lateral surface of the compound semiconductor layer is removed by a wet etching process.

Abstract: A wireless communication system has a queue information search unit for searching a queue-status information provided in a packet unit, a communication priority decision unit for deciding communication priority of external devices based on the queue-status information, giving a higher priority to the external device having a greater number of packets in queues, a communication initiation unit for initiating a communication with the external devices according to the communication priority, a counter for counting the number of times that the communication is initiated for each of the external devices, and a comparator for comparing a counter value of a first external device that corresponds to a transmitted data with a counter value of a second external device that has a maximum counter value. Accordingly, when the wireless communication device transmits and receives data with respect to the plural wireless communication devices, both high throughput and high fairness can be guaranteed.

Abstract: A routing method in consideration of the power and transmission delay in a wireless ad hoc network and a terminal device adopting the same are provided, which can reduce the power consumption and packet delay by considering both the power consumption and packet delay. The terminal device includes a judgment unit that determines whether a first accumulative hop count included in a first route request (RREQ) packet exceeds a predetermined route decision value for limiting a hop count from a source node to a destination node, and a control unit that determines a route to the source node, based on information included in the first RREQ packet, if the judgment unit determines that the first accumulative hop count does not exceed the route decision value.

Abstract: A connection establishment apparatus and method between devices located on a WPAN are provided. The apparatus includes a control module that wakes up a ZigBee channel; a Zigbee module that scans at least one device located on the WPAN using the ZigBee channel and acquires Bluetooth connection information from the scanned device using the ZigBee channel; and a Bluetooth module that performs Bluetooth paging with the other devices by using the Bluetooth connection information, and establishes a Bluetooth piconet.

Abstract: An apparatus and method for analyzing the performance of an ATM switch, and an ATM switching system employing the same. The apparatus includes a traffic detecting portion for detecting traffic of constant bit rate connection type data and available bit rate connection type data input to the ATM switch installed in a communication network for processing a data circuit switching, and a performance analyzing portion for calculating a performance of processing the constant bit rate connection type data and the available bit rate connection type data according to information related to the detected traffic of the constant bit rate connection type data and the available bit rate connection type data. According to the apparatus and method, and an ATM switching system employing the same, performance of the ATM switch can be analyzed and the analyzed result can be used in designing the ATM switch.

Abstract: A wireless communication method according to the present invention, in a Bluetooth device connected to multiple piconets and operating in a scatter mode, includes steps of (a) establishing credit values by link for the multiple piconets, and the total sum of the credit values by link as a temporary account value; (b) updating the credit values by link and the temporary account value every slot based on a predetermined manner; (c) performing communications through a link selected based on a comparison result of the credit values by link at each Presence Point(PP); and (d) unevenly redistributing predetermined credit values based on characteristics by link and returning to the step (b) in one of the two cases in which the communications are interrupted with a POLL_NULL sequence and the temporary account value becomes the same as the total number, n, of links.

Abstract: Disclosed is a Bluetooth wireless communication apparatus and method for indicating devices connectable to ad-hoc networks. The Bluetooth wireless communication apparatus is provided with a user interface and a control unit. The user interface enables a user to select a device to which he or she wishes to connect. The control unit provides, through the user interface, information on peripheral devices in a range connectable to the wireless communication device, and, if a device to which the user wants to connect is selected through the user interface, establishes a connection to only a device to which the user wishes to connect, out of the peripheral devices. Accordingly, connection is made only to a device that a user wishes, while connection to the devices to which the user does not want to connect is not made.

Abstract: Disclosed is a wireless communication system capable of minimizing the hand-off throughput for wireless communication systems. The wireless communication system according to the present invention includes a first communication device for carrying out an inquiry and paging with respect to a wireless communication device located within a communication allowance range, and starting a connection with the wireless communication device; and a second communication device for receiving and transmitting data with the wireless communication device when the wireless communication device connected with the first communication device is cut off by a hard hand-off.

Abstract: A communication system capable of improving a TCP transmission efficiency includes a transmitter for transmitting data packets; a receiver connected to the transmitter, and for receiving the data packets and transmitting to the transmitter response signals with respect to the received data packets; and a multiplexer for multiplexing and transmitting to the transmitter the response signals transmitted from the receiver, and transmitting the transmitted data packets from the transmitter to a corresponding receiver, the multiplexer provided with a queue status monitor for monitoring queue statuses of the transmitted data packets and/or response signals, and a congestion control adjuster instructing the receiver to hold or compress the response signals based on the monitored queue status. Accordingly, the communication system can carry out efficient TCP congestion control by reducing a load of the TCP congestion control of the transmitters and receivers.

Abstract: A wireless communication system has a queue information search unit for searching a queue-status information provided in a packet unit, a communication priority decision unit for deciding communication priority of external devices based on the queue-status information, giving a higher priority to the external device having a greater number of packets in queues, a communication initiation unit for initiating a communication with the external devices according to the communication priority, a counter for counting the number of times that the communication is initiated for each of the external devices, and a comparator for comparing a counter value of a first external device that corresponds to a transmitted data with a counter value of a second external device that has a maximum counter value. Accordingly, when the wireless communication device transmits and receives data with respect to the plural wireless communication devices, both high throughput and high fairness can be guaranteed.

Abstract: A wireless communication system to support real time service and handoff method thereof. A plurality of mobile management units having a plurality of visitor management units perform a handoff based on the movement of a mobile communication unit. One or more visitor management unit is a common visitor management unit that is included in a network constructed by the plurality of mobile management units. When the mobile communication unit moves to another visitor management unit of the same mobile management unit, the mobile management unit including the mobile communication unit updates the mobility information to provide a real time service path between the information providing unit and the mobile communication unit. When the mobile communication unit moves to a different mobile management unit, the common visitor management unit requests another mobile management unit for registration of the mobile communication unit, thereby making a reservation for a real time service path.

Abstract: An apparatus and method for analyzing the performance of an ATM switch, and an ATM switching system employing the same. The apparatus includes a traffic detecting portion for detecting traffic of constant bit rate connection type data and available bit rate connection type data input to the ATM switch installed in a communication network for processing a data circuit switching, and a performance analyzing portion for calculating a performance of processing the constant bit rate connection type data and the available bit rate connection type data according to information related to the detected traffic of the constant bit rate connection type data and the available bit rate connection type data. According to the apparatus and method, and an ATM switching system employing the same, performance of the ATM switch can be analyzed and the analyzed result can be used in designing the ATM switch.