Abstract: A communication device operating as a master unit includes: a MAC layer termination functioning unit for extracting, from a receiving signal, queue length information scheduled to be transmitted from an ONU, and controlling transmission of a grant to the ONU; a traffic monitor for measuring an amount of uplink traffic of each ONU; and a bandwidth allocation functioning unit for determining a bandwidth to be allocated to each ONU based on the queue length information extracted by the MAC layer termination functioning unit, the amount of traffic measured by the traffic monitor, and a bandwidth that can be allocated in one cycle of bandwidth update, and issuing a grant according to the determination. The bandwidth allocation functioning unit updates a bandwidth to be allocated periodically.

Abstract: A process of manufacturing inorganic nanofibers, without using an organic polymer, using a highly reactive metal alkoxide such as titanium alkoxide or zirconium alkoxide, in particular, a process in which inorganic nanofibers can be stably produced over a long period, is provided. It is a process of manufacturing inorganic nanofibers by electrospinning using a sol solution containing an inorganic component as a main component, characterized in that the sol solution contains a metal alkoxide having a high reactivity and a salt catalyst, and that the salt catalyst is an amine compound having an N—N bond, an N—O bond, an N—C?N bond, or an N—C?S bond.

Abstract: Novel butadiene derivatives of the formula [I]: ##STR1## wherein Ring A is tri-lower alkoxyphenyl, R.sup.1 and R.sup.2 combine each other to form a group of the formula: ##STR2## or one of R.sup.1 and R.sup.2 is lower alkoxy, and the other is group of the formula: -NHR.sup.3, in which R.sup.3 is hydrogen, substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkoxy, substituted or unsubstituted amino, hydroxy or pyridylcarbonyl, or salts thereof, these compounds have excellent antithrombotic activity and are useful as antithrombotic drug, or synthetic intermediate for preparing other antithrombotic drug.

Abstract: Novel succinimide derivatives of formula I!: ##STR1## wherein Ring A is tri-lower alkoxyphenyl, R.sup.1 and R.sup.2 combine each other to form a group of the formula:>N--R.sup.3or one of R.sup.1 and R.sup.2 is lower alkoxy, and the other is group of the formula: --NHR.sup.3, in which R.sup.3 is hydrogen, substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkoxy, substituted or unsubstituted amino, hydroxy or pyridylcarbonyl, or salts thereof, these compounds have excellent antithrombotic activity and are useful as antithrombotic drug, or synthetic intermediate for preparing other antithrombotic drug.