Abstract: Provided is a system and method of testing a plurality of devices under test (DUTs) in parallel. The method includes preparing at least two DUTs having input/output signal pins connected in common to one input/output signal channel and having chip selection signal pins connected to a chip selection signal channel, which provides a chip selection signal to specify one output data among output data to be outputted through the commonly connected input/output channel. The method includes reading the outputted data specified by the chip selection signal through the commonly connected input/output signal channel from one of the devices under test selected by the chip selection signal.

Abstract: Methods for bit allocation and power tuning for optimizing a setup time in a multi-channel communication system. In one aspect, a bit allocation method includes measuring a signal-to-noise ratio (SNR) of each subchannel of a channel, determining a greatest allocable bit number of each subchannel using the measured SNR of the subchannels, determining a sum of the greatest allocable bit numbers of the subchannels, and determining a difference between the sum of the greatest allocable bit numbers of the subchannels and a target bit number. For each subchannel, a currently allocated bit number of the subchannel is set equal to the greatest allocable bit number of the subchannel, if the difference between the sum of the greatest allocable bit numbers and the target bit number is less than or equal to a predetermined value.

Abstract: A method for estimating a phase response for an upstream area in a channel is based on an extrapolation and, following forcible distortion of an amplitude response, coefficients of a time domain equalizer and coefficients of a channel target circuit are determined using a minimum MSE algorithm. When the cost function of a minimum MES is determined, the square of the coefficients of the time domain equalizer are included for determining the cost function in order to reduce the probability that the coefficients of the time domain equalizer diverge. A channel-shortening effect of the time domain equalizer is improved to reduce inter-symbol interference (ISI) and inter-channel interference (ICI). As a result, a signal to noise ratio (SNR) of a communication system is improved.

Abstract: A testing system for memory Devices Under Test (DUTs) uses an improved wiring scheme to increase the parallel test number. In a preferred embodiment, the parallel testing system increases the parallel test number by commonly connecting data input/output pins of the memory devices to an input/output channel of the testing system. Driving channels may also be connected in parallel to driving pins of the plurality of semiconductor memory devices under test.

Abstract: A method for strictly managing group membership in Internet multicast applications is disclosed. The method comprises a group creation and enrollment step, a group announcement step, a group query step, a group information acquisition step, a group registration step, a leaving of the group step, a failure information response step and a fragment message transmission step. In the group creation and enrollment step, a group management server creates a group and performs group registration. In the group announcement step, the group management server announces the created group. In the group query step, the group management client inquires the group information of the group management server. In the group information acquisition step, the group management client joins a known group address and acquires the group information. In the group registration step, the group management client enrolls in the group management server. In the leaving of the group step, the group management client leaves the group.

Abstract: A method of automatically generating IPv6 unicast addresses in IPv6-based next-generation Internet communication environments using a telephone number of a E.164 format allocated to a telephone terminal, and a method of looking up 32-bit IPv4 addresses or 128-bit IPv6 addresses, which are previously allocated to name addresses consisted of E. 164 telephone numbers, from a DNS. An automatic creation relates to a method in which an Internet host as a sender of an IP packet creates an IP address and a search from the DNS indicates a process of looking up an IP address of a receiver. The method automatically generates an IP address of a sender based on a telephone number and a search of an IP address of a receiver using DNS.