Abstract: The present invention relates to a naphthalimide sulfonate derivative, and a photoacid generator and a photoresist composition each comprising same and, more specifically, to a naphthalimide sulfonate derivative compound, and a photoacid generator and a photoresist composition each comprising same, wherein the compound has excellent absorbance for light of i-line (365 nm) wavelength, is greatly easy to prepare into a polymerizable composition due to very high solubility in an organic solvent, has good thermal stability, and shows a favorable acid generation rate.

Abstract: The present invention relates to a method for dynamically allocating bandwidth under a media access control (MAC) protocol between an optical line termination (OLT) and a group including a plurality of optical network units (ONUs) in an ATM-PON. In order to meet quality of service (QoS) requirement, the dynamic bandwidth allocation method is capable of determining bandwidth to be allocated to each of the ONUs on the basis of information about traffic indicators of connections established to each of the ONUs and about the number of non-real time cells waiting in each of the ONUs, resulting in an enhancement in utilization efficiency of an upstream transmission channel and enabling an effective transmission.

Abstract: The present invention relates to a method for dynamically allocating bandwidth under a media access control (MAC) protocol between an optical line termination (OLT) and a group including a plurality of optical network units (ONUs) in an ATM-PON. In order to meet quality of service (QoS) requirement, the dynamic bandwidth allocation method is capable of determining bandwidth to be allocated to each of the ONUs on the basis of information about traffic indicators of connections established to each of the ONUs and about the number of non-real time cells waiting in each of the ONUs, resulting in an enhancement in utilization efficiency of an upstream transmission channel and enabling an effective transmission.

Abstract: A medium access control (MAC) technique between a group of optical network units (ONU) and an optical line termination (OLT) on an asynchronous transfer mode passive optical network (ATM-PON) is disclosed. The downstream frame from the OLT to the group of ONUs includes PLOAM cells having data grant fields, PLOAM grant fields and divided-slot grant fields whose format, being allocated with different identification bit values, is distinguished one from another. The upstream frame from the group of ONUs to the OLT includes a divided-slot structure of 56-byte size, which is divided into four 14-byte minislots for transmitting cell information on the number of real-time cells and non-real-time cells that have arrived at a corresponding ONU. The data grant field format has a quality of service (QoS) class bit allocated for classifying real-time or non-real-time traffics, thus improving the efficiency of utilization as well as efficient transmission.