Abstract: A variable optical attenuator with tunable wavelength selectivity includes at least two reflectors disposed parallel to each other at a predetermined angle from an optic axis and driving units connected to said at least two reflectors for allowing the reflectors to move back and forth in a direction perpendicular or parallel to the optic axis or to revolve centering on an axis perpendicular or parallel to the optic axis. Since the variable optical attenuator of the present invention serves as a variable optical attenuator and, at the same time, as a tunable wavelength filter, problems of insertion loss and optical alignment that might be caused by separately installing a variable optical attenuator and a wavelength filter can be effectively prevented. Moreover, by implementing the variable optical attenuator and the tunable wavelength filter by using a single device, the size of a system using the optical attenuator can be reduced.

Abstract: Disclosed are a method and an apparatus for producing a uranium foil with fine crystalline granules by forming the foil by the gravitational dropping of molten uranium or uranium alloy and rapidly cooling the foil by the contact with cooling rolls, and a foil produced thereby. In accordance with the present invention, a high-purity and high-quality uranium foil with an isotropic structure and fine crystalline granules is easily produced via a simple process without requiring hot rolling and heat treatment processes. The surface of the foil is prevented from oxidizing and residual stress is not imparted to the foil. The productivity and the economic efficiency of the foil are improved.

Abstract: The present invention relates to a wavelength tunable filter capable of being driven such that reflecting mirrors move more distant as well as closer by using the principle a direction of the electromagnetic forces changes depending on the direction of the current flowing perpendicular to the external magnetic field. According to the wavelength tunable filter of the present invention, when it is necessary to have the wavelength tuning range and mechanical structure similar to the conventional wavelength tunable filter driven in only one direction, it is possible to lower the maximum force needed to drive the filter to a half, and reduce a probability that a pill-in phenomenon occurs. On the other hand, it is possible to reduce a wavelength change time of the element by increasing a resonant frequency when the same wavelength tuning ranges are implemented by using the same maximum driving forces.

Abstract: Disclosed are a method and an apparatus for continuously casting a uranium rod so that impurities generated in melting the metallic substance reduced from nuclear spent fuel are easily removed, the molten metal is easily degassed, the oxidation of uranium is prevented, and the molten metal does not remain in a crucible, thereby completely removing the noxious gas, improving the safety of work, allowing the workers to be close to the apparatus, reducing the consumption rate of the inert gas, completely preventing the oxidation of uranium, and being remotely controlled.

Abstract: An active type tunable wavelength optical filter having a Fabry-Perot structure is disclosed. A tunable wavelength optical filter which comprises a lower mirror in which silicon films and oxide films are sequentially laminated in a multi-layer and the silicon film is laminated on the highest portion; an upper mirror in which silicon films and oxide films are sequentially laminated in a multi-layer and the silicon film is laminated on the highest portion and which is spaced away from the lower mirror by a predetermined distance; a connecting means for connecting and supporting the lower mirror and the upper mirror to a semiconductor substrate; and electrode pads for controlling the gap between the lower mirror and the upper mirror by an electrostatic force and the method of manufacturing the same are provided.

Abstract: A variable optical attenuator with tunable wavelength selectivity includes at least two reflectors disposed parallel to each other at a predetermined angle from an optic axis and driving units connected to said at least two reflectors for allowing the reflectors to move back and forth in a direction perpendicular or parallel to the optic axis or to revolve centering on an axis perpendicular or parallel to the optic axis. Since the variable optical attenuator of the present invention serves as a variable optical attenuator and, at the same time, as a tunable wavelength filter, problems of insertion loss and optical alignment that might be caused by separately installing a variable optical attenuator and a wavelength filter can be effectively prevented. Moreover, by implementing the variable optical attenuator and the tunable wavelength filter by using a single device, the size of a system using the optical attenuator can be reduced.

Abstract: Disclosed are a method and an apparatus for continuously casting a uranium rod so that impurities generated in melting the metallic substance reduced from nuclear spent fuel are easily removed, the molten metal is easily degassed, the oxidation of uranium is prevented, and the molten metal does not remain in a crucible, thereby completely removing the noxious gas, improving the safety of work, allowing the workers to be close to the apparatus, reducing the consumption rate of the inert gas, completely preventing the oxidation of uranium, and being remotely controlled.

Abstract: Disclosed is a 2-amino-5-acylamino-4-substituted-phenol compound having the structural formula I: wherein Y is a substituent group, and R′ is a ballast group. Also disclosed is a simplified method for preparing a photographic coupler using this compound.

Abstract: The present invention relates to a PID/section filter which is adapted without any restriction to an ATSC standard or a DVB standard, comprising a processor module for detecting a PID and a TID by decoding the input transport stream, downloading the information requested by the viewer, and controlling the operation of the each system unit in order to store the information on a memory or ignores it, a PID comparing circuit module for comparing the PID value stored on an internal register with the PID value from the processor module, a download circuit module for downloading the extracted information among the decoded information by the processor module, and an external memory managing module for storing the information extracted in-accordance with the request of the viewer among the information decoded on the processor module.

Abstract: Disclosed is a 4-acylamino-2-hydroxy-5-substituted-acylanilide compound having the structural formula I: wherein R is hydrogen or an alkyl group, Y is a group linked to the rest of the compound by a —O—, —S—, or —N— atom; and R′ is a substituent group. Also disclosed is a method of using the compound in making a cyan dye-forming photographic coupler.

Abstract: Disclosed are a method and an apparatus for producing a uranium foil with fine crystalline granules by forming the foil by the gravitational dropping of molten uranium or uranium alloy and rapidly cooling the foil by the contact with cooling rolls, and a foil produced thereby. In accordance with the present invention, a high-purity and high-quality uranium foil with an isotropic structure and fine crystalline granules is easily produced via a simple process without requiring hot rolling and heat treatment processes. The surface of the foil is prevented from oxidizing and residual stress is not imparted to the foil. The productivity and the economic efficiency of the foil are improved.

Abstract: Disclosed is a 2-amino-5-acylamino-4-substituted-phenol compound having the structural formula I: 1

Abstract: The invention relates to a 2-halo-1-cycloalkenecarboxamides represented by Formula I: wherein n is 1 or 2; R is hydrogen or an alkyl group; and X is a halogen.

Abstract: Disclosed is a 4-amino-2-hydroxy-5-substituted-acylanilide compound having the structural formula I: wherein R is hydrogen or an alkyl group, and Y is a substituent group linked to the rest of the compound by a hetero atom. Also disclosed is a method of using the compound to prepare an intermediate in a simplified process for making a cyan dye-forming coupler.

Abstract: Disclosed is a 6-acylamino-5-substituted-benzoxazol-2-one compound having the structural formula I: wherein Y is halogen or a substituent group linked to the rest of the compound by a hetero atom, and R′ is a group containing at least 8 carbon atoms. Also disclosed is a method for forming a cyan dye-forming coupler from the above compound. The method and intermediate provide a simplified manufacturing process.

Abstract: Disclosed is a 2-benzyloxy-4-nitro-5-substituted-acylanilide compound of the general formula I: wherein R is hydrogen or an alkyl group, each RA is an independently selected substituent and n is 0-5, and Y is a substituent group linked to the rest of the compound by a hetero atom. Also disclosed is a method for using the intermediates in manufacture of dye-forming couplers.

Abstract: Disclosed is a compound comprising a 2-benzyloxy-5-haloacylanilide having the structural formula I: wherein R is hydrogen or an alkyl group, RA is a substituent and n is 0-5; and X is a halogen. Also disclosed is a method for preparing a coupler using the compound. The compound and method simplify the preparation of photographic couplers.

Abstract: The invention relates to a 2-halo-1-cycloalkenecarboxamides represented by Formula I: 1

Abstract: Disclosed is a 5-acylamino-2-arylazo, nitro, or nitroso-4-substituted-phenol having the structural formula I: wherein: R* is an arylazo, nitro, or nitroso group, Y is a coupling-off group, and R′ is a substituent group. Also disclosed is a method of using the compound in a simplified process for making a photographic coupler.

Abstract: The present invention is concerned with the fabrication process of low or high enrichment uranium and uranium alloy foil, and the fabrication apparatus therefor. Uranium (U) and uranium alloy [U—(A)Q—(B)X—(C)Y (Q: Al, Fe, Ni, Si, Cr, Zr element, X: Al, Fe, Ni, Si, Cr, Zr element, Y: Al, Fe, Ni, Si, Cr, Zr element, Q≠X≠Y, (A)≦1 wt %, (B)≦1 wt %, (C)≦1 wt %)] foil are directly obtained from a melt, not through a vacuum induction melting & casting, ingot cutting, hot-rolling and heat-treatment process, but through melt spinning or a twin-roll casting process. Major advantages have been obtained as follows: 1) a simplified process without the hot-rolling process and heat-treatment process, 2) an improvement in productivity and process economics in foil fabrication, and 3) a high purity and a high quality of the foil.