Abstract: A network system including M terminals each connected to the network, and a certain of the M terminals includes memory for storing information about the M terminals including the certain terminal in a manner that each of the M terminals is associated with one of N groups (N<M). Upon receiving first information from a different terminal, the certain terminal selects a group to which second information is to be transmitted, out of the N groups on the basis of the group associated with the different terminal, selects a terminal, to which the second information is to be transmitted, out of the terminals associated with the selected group and transmits the second information to the selected terminal.

Abstract: To provide lossless embedding of a visible watermark in compressed motion picture data. The present invention includes a quantization/dequantization operation part 10 for dequantizing motion picture data that has been subjected to compression including frequency transformation and quantization, and a watermark embedding/removing operation part 30 for generating and embedding a pattern of a visible watermark corresponding to a motion compensated prediction in motion picture data dequantized by the quantization/dequantization operation part 10. The quantization/dequantization operation part 10 quantizes motion picture data with a watermark embedded by the watermark embedding/removing operation part 30.

Abstract: A network system including M terminals each connected to the network, and a certain of the M terminals includes memory for storing information about the M terminals including the certain terminal in a manner that each of the M terminals is associated with one of N groups (N<M). Upon receiving first information from a different terminal, the certain terminal selects a group to which second information is to be transmitted, out of the N groups on the basis of the group associated with the different terminal, selects a terminal, to which the second information is to be transmitted, out of the terminals associated with the selected group and transmits the second information to the selected terminal.

Abstract: [Object]To provide lossless embedding of a visible watermark in compressed motion picture data.

Abstract: The present invention is directed to a ketonitrile derivative represented by the following formula (1): ##STR1## (wherein R.sup.1 is a hydrogen atom or a lower alkyl group; each of R.sup.2, R.sup.3, R.sup.4, and R.sup.

Abstract: Disclosed herein are cyanoketone derivatives of the following formula (1) ##STR1## such as 1-cyano-1-piperidinocarbonyl-3-[4-(2-chloro-4-trifluoromethylphenoxy)pheno xy]-2-butanone, 1-cyano-1-piperidinocarbonyl-3-[4-(3-chloro-5-trifluoromethyl-2-pyridyloxy )phenoxy]-2-butanone, 1-cyano-1-(N-methyl-N-dichlorophenyl)aminocarbonyl-3-[4-(2-quinoxalyloxy)p henoxy]-2-butanone, 1-cyano-1-(N,N-dibutyl)aminocarbonyl-3-[4-(3-chloro-5-trifluoromethyl-2-py ridyloxy)phenoxy-2-butanone, and the like, which are characterized by excellent herbicidal activity and effectiveness against a variety of gramineous weeds.

Abstract: A cyanoketone derivative of the following formula (1) ##STR1## wherein A.sub.1 is a substituted or unsubstituted phenyl or naphthyl group or a substituted or unsubstituted heterocyclic group;each of X.sub.1, X.sub.2 and X.sub.3 is independently an oxygen or sulfur atom;each of B.sub.1, B.sub.2 and B.sub.3 is independently a hydrogen atom or C.sub.1 -C.sub.6 -alkyl group;each of Y.sub.1, Y.sub.2, Y.sub.3 and Y.sub.4 is independently a hydrogen atom, a halogen atom or a C.sub.1 -C.sub.6 -alkyl group; andA.sub.2 is a substituted or unsubstituted group selected from the group consisting of a C.sub.1 -C.sub.6 -alkyl group, a C.sub.2 -C.sub.6 -alkenyl group, a C.sub.2 -C.sub.6 -alkynyl group, a C.sub.1 -C.sub.4 -alkoxy group, a C.sub.1 -C.sub.4 -alkylthio group, a C.sub.1 -C.sub.6 -alkoxycarbonyl group, an unsubstituted benzoyl group, a halogen-substituted benzoyl group, a cyano group or a group as defined in A.sub.1 ;provided that when B.sub.1 is a hydrogen atom and B.sub.