Abstract: Radio signals including modulated radar signals of an unknown modulation type selected from among a predetermined group of modulation types are received, and a plurality of features are extracted for the received radio signals. A plurality of two dimensional (2D) maps are generated for pairs of the extracted features from the received radio signals. The 2D maps of extracted feature pairs for the received radio signals are processed using a binary tree of discriminating vectors, each of the discriminating vectors corresponding to recognition of at least one of the predetermined modulation types based on 2D feature maps and each of the discriminating vectors determined by processing 2D maps for pairs of features extracted from training samples using a support vector machine learning algorithm. The binary tree is derived by pruning permutations of sequences for applying the discriminating vectors according to iterative testing of modulation type recognition accuracy.

Abstract: Radio signals including modulated radar signals of an unknown modulation type selected from among a predetermined group of modulation types are received, and a plurality of features are extracted for the received radio signals. A plurality of two dimensional (2D) maps are generated for pairs of the extracted features from the received radio signals. The 2D maps of extracted feature pairs for the received radio signals are processed using a binary tree of discriminating vectors, each of the discriminating vectors corresponding to recognition of at least one of the predetermined modulation types based on 2D feature maps and each of the discriminating vectors determined by processing 2D maps for pairs of features extracted from training samples using a support vector machine learning algorithm. The binary tree is derived by pruning permutations of sequences for applying the discriminating vectors according to iterative testing of modulation type recognition accuracy.

Abstract: Described is a continuous process for preparing indolenine compounds which comprises charging continuously and simultaneously to a reactor containing an acetic acid reaction medium (1) substituted phenylhydrazine and (2) unsymmetrical ketone from separate sources, continuously discharging from the reactor indolenine product in acetic acid solution, separating acetic acid from the indolenine product, recycling separated acetic acid to the reactor, neutralizing residual acetic acid remaining in the indolenine product with aqueous inorganic alkaline reagent, and separating from the indolenine product an aqueous solution of salts resulting from the preparation and neutralization of the indolenine product.

Abstract: Indoleninium halides, e.g., indoleninium iodides, are prepared by reacting the corresponding indolenine with an organic halide reactant, e.g., alkyl halide, such as methyl iodide, the organo portion of which undergoes addition to the nitrogen atom of the indolenine at conventional reaction temperatures in the presence of a high boiling (80.degree. C.-200.degree. C.) organic ketone solvent selected from the group consisting of acyclic ketones containing from 4 to 12 carbon atoms and alicyclic ketones containing from 4 to 10 carbon atoms.

Abstract: A sock (hosiery) with identification markings includes the sock, a written word description of the color of the sock, and a symbol or symbols. The word description and the symbol are permanently integrated into the sock. The user uses the markings to pair the socks after laundry, to identify the color of the socks in poor light conditions, and to keep original pairs of socks together.