Abstract: Disclosed is a single-mode optical fiber suitable for and optical transmission line used in WDM (Wavelength Division Multiplexing) system, which has low dispersion slope, sufficient dispersion value and large effective section area over S-, C- and L- band (1460˜1625 nm) to enable high-speed, large-capacity signal transmission. The optical fiber uses the wavelength region from 1460 to 1625 nm, and the optical fiber also has a dispersion value of 0.1˜3.0 ps/nm-km, more preferably 0.3˜2.4 ps/nm-km, at 1460 nm, a dispersion value of 3.0˜5.5 ps/nm-km, more preferably 3.2˜5.2 ps/nm-km, at 1550 nm, and a dispersion value of 4.5˜8.0 ps/nm-km, more preferably 4.8˜7.7 ps/nm-km, at 1625 nm. In addition, the optical fiber has a dispersion slope of 0.023˜0.05 ps/nm-km2 at 1550 nm, an effective sectional area of 35˜50 ?m2 at 1550 nm, an effective section area of 35˜50 ?m2 at 1460 nm.

Abstract: A method for manufacturing a very low roughness copper foil and an apparatus for manufacturing the copper foil. In the method of the present invention, a pickling process, an electrolytic polishing process and a washing process are successively performed after the copper foil was manufactured. In order to manufacture the very low roughness copper foil, the electrolytic polishing process is accomplished with the copper foil to face a metal cathode plate and supplying a current in order to perform the electrolytic polishing.

Abstract: Disclosed is an injection unit having a rotatable device for preventing reverse flow. To connect first flow channels formed in a spacer and second flow channels formed in a screw head when the metering is performed, and prevent reverse flow of resin by cutting off the first flow channels and the second flow channels when the resin is injected, the injection unit has a torsion spring as spring means between a shaft of the screw head and a screw, thereby rapidly preventing movement of the melted resin by restoring force of the spring when the metering of the resin is finished.

Abstract: The present invention relates to silane adducts having a relatively higher adhesive strength as expressed formula X3SiR1, and manufacturing method thereof. wherein X is a hydrogenated form selected from one of epoxy compounds, amino compounds and bisphenolic, and R1 is selected from one of glycidyloxypropyl group, 2-(3,4-epoxycyclohexyl)ethyl group, 3-acryloxypropyl group, 3-methacryloxypropyl group, amino-propyl group, 3-[2-(2-aminoethylamino)ethylamino]propyl group, N-methylaminopropyl group, N-phenylaminopropyl group, N,N-dimethyl-3-aminopropyl group, mercapto-propyl group, cyano-propyl group, and isocyanato-propyl group.

Abstract: An intermediate jointing structure having excellent mechanical and electrical characteristics and method of preparing the same. The intermediate jointing structure includes a metal pipe and a jointing sleeve. The metal pipe is inserted between a pair of superconducting cables and is fixed to the formers by welding. A plurality of superconductor wires, shorter than the conductive metal tube, are arranged around a conductive metal tube in a longitudinal direction. The arranged superconductor wires are taped with Ag tape so as to form the jointing sleeve. The jointing sleeve is jointed and fixed on an outer surface of the metal pipe.

Abstract: An optical cable having a metal tube receiving an optical fiber and bent to form a waved shape is disclosed. The optical cable may prevent cutoff of the optical fiber or deterioration of optical characteristics though tensile force is applied to the optical cable in its longitudinal direction since the metal is formed in a waved shape. To bend the metal tube, the metal tube is passed through roller pair(s) which are shaken in a direction perpendicular to the advancing direction of the metal tube. Thus, it is possible to obtain excess fiber length (EFL) easily and accurately as desired.

Abstract: Triazine ring based polymers for photoinduced liquid crystal alignment introduces photoactive groups for inducing, reinforcing, improving and preserving liquid crystal alignment, for example photoreactor such as cinnamate, coumarin, chalcone and maleimide, as a chain to have at least one photoactive group. One of the photoactive groups can experience Fries rearrangement which induces liquid crystal alignment, and other groups can experience photodimerization, photoisomerization, photocrosslinkng or photodegradation to reinforce, change or preserve the generated alignment.

Abstract: An underground power cable having an optical fiber sensor for measuring temperature distribution is disclosed. In the power cable, an optical fiber for measuring temperature distribution is received in a stainless steel tube having excellent strength, and this optical tube is interposed between a core and a sheath of the power cable. When arranging the optical tube in the power cable, a supporting material having a relatively low strength than the optical tube is arranged in the cable together in order to prevent the optical fiber from being damaged by external force and prevent the inner insulation layer from being broken down by the optical tube. In addition, a fixing tape for fixing the optical tube in contact with the core may be added to prevent the optical tube from being bent seriously or inclined to one side when the cable is bent.

Abstract: The present invention relates to an anisotropic conductive adhesive comprising an anisotropic conductive adhesive combined with a crystalline polymer to realize anisotropic conductivity and PTC (Positive Temperature Coefficient) characteristics at the same time. The anisotropic conductive adhesive having PTC characteristics according to the present invention comprises an insulating adhesive component and a plurality of conductive particles dispersed in adhesive component, in which the insulating adhesive component comprises a crystalline polymer. Since the anisotropic conductive adhesive according to the present invention includes a crystalline polymer, when temperature rises and the volume expands, electrical resistance is rapidly increased, whereby current flow is intercepted resulting in blocking current, providing PTC characteristics acting as a switch. Thus, it shows circuit protection function as well.

Abstract: Disclosed is an interleaver for an optical communication system. A dual collimator is combined with a first optical fiber acting as a light input port and one end of a second optical fiber spaced from the first optical fiber, and switches light advancing along the first and second optical fibers into parallel light. A beam splitter is arranged so that one surface is opposite to the dual collimator, and transmits one half of an input light and reflects the other half of the input light. A single collimator is arranged opposite to the other surface of the beam splitter, and combined with the other end of the second optical fiber so as to switch light advancing toward the other end of the second optical fiber into parallel light. An output optical fiber is arranged opposite to the other surface of the beam splitter and acts as a light output port.

Abstract: PTC conductive polymer composition includes organic polymer containing polyolefin components essentially consisting of 30˜40 w % high density polyethylene (HDPE), 20˜40 w % low density polyethylene (LDPE) and 10˜30 w % ethylene-acrylic-acid (EAA) or ethylene-vinyl-acetate (EVA), and 20˜30 w % high or low density polyethylene which is denaturated into maleic anhydride compound; 60˜120 w % electrical conductive particles dispersed into the organic polymer, the electrical conductive particles by weight of the organic polymer; and 0.2˜0.5 w % peroxidic cross-linking agent added for cross-linking reaction by weight of the organic polymer. Thus, it becomes possible to control PTC characteristics such as switching temperature and trip time of an electrical device by suitably adjusting an added amount of the polyethylene, which is denaturated into maleic anhydride compound.

Abstract: Disclosed are an optical fiber unit in which at least 1-core optical fiber is mounted in and protected by a buffer tube, and an optical cable including the optical fiber unit. The buffer tube is made of a mixture, which includes a composite resin including a resin selected from polyolefin polymer, nitrile rubber and their mixture, and plasticized polyvinylchloride; and an inorganic additive, wherein, in a stress-strain curve of the buffer tube, a modulus is 5 to 50 kgf/mm2 in a linear region with an elongation less than 1% and a tan ? is less than 0.5 at 30° C. The buffer tube of the optical fiber unit may be very usefully applied to an optical cable because it may be easily cut out to ensure easy contact and gives excellent elasticity without being crushed by lateral pressure.

Abstract: Disclosed is a power supply for measuring the line impedance of an underground cable, which includes an input terminal section having a plurality of input terminals, a plurality of autotransformers, a transformer adjustment tap, a plurality of 3rd-harmonics cancellation transformers, and an output terminal section having a plurality of output terminals. The autotransformers are connected respectively to the input terminals. The transformer adjustment tap is connected to all of the autotransformers. The 3rd-harmonics cancellation transformers are connected respectively to the autotransformers. The output terminals are connected respectively to the 3rd-harmonics cancellation transformers.

Abstract: The present invention discloses an anisotropic conductive adhesive comprising an insulating adhesive component and a number of conductive particles dispersed in the insulating adhesive component, wherein the insulating adhesive component contains a crosslinked rubber resin. The anisotropic conductive adhesive of the present invention prevents exfoliation of an adhesive or reduction in adhesive strength of circuit by minimizing its the heat-contraction occurring in the process of a polymerization or a hardening reaction when connecting micro-circuits, whereby a short circuit between adjacent electrodes can be prevented when connecting the circuits, and excellent connection reliability according to a long-term use is achieved.

Abstract: Disclosed is an optical fiber composite power cable having a loose-tube-type optical fiber impregnated therein, wherein the optical fibers are installed in a loose tube made of metal to prevent lateral pressure from being imposed on the optical fibers by the metal conductors, even when tensile force or bending force is applied to the cable.

Abstract: An electrical device including a PTC conductive polymer sheet, and first and second electrodes physically contacted with opposite surfaces of the conductive polymer sheet is disclosed. The first and second electrodes have a plurality of protrusions protruded from surfaces thereof, respectively. The protrusions have an surface roughness (Rz) of 1 to 20 ?m and an average width ({overscore (Rw)}) which is 0.5 to 2 times of the surface roughness (Rz), and an average gap ({overscore (Rg)}) between adjacent protrusions is 0.5 and 2 times of the surface roughness (Rz). The conductive polymer sheet has a thickness which is more than 5 times of the surface roughness (Rz).

Abstract: Disclosed herein is an apparatus for cleaning a lubricant for dry-type wire drawing. The apparatus comprises a case provided with a cover and piercing holes at opposite sides of the case such that a steel wire can pass through the case, a plurality of driving motors provided at one side of the exterior of the case, rotating members located at an inside of the case and connected to the driving motors, respectively, by belts serving to rotate them, support plates for supporting the rotating members, and cleaning members coupled to the rotating member and adapted to provide a path through which the steel wire passes. The dry lubricant on the surface of the steel wire can be effectively cleaned by friction between the lubricant on the steel wire and the cleaning members.

Abstract: Disclosed is a method of manufacturing an optical fiber perform using MCVD including dehydration and dechlorination, which executes the following process repeatedly with changing the composition of soot generation gas according to the refractive index profile, the process including the steps of: forming a soot layer having pores on an inner wall of a deposition tube at a temperature lower than the soot sintering temperature with putting soot generation gas and oxygen gas into the rotating deposition tube; removing hydroxyl groups with keeping the pores by putting dehydration gas into the deposition tube; removing chlorine impurities existing in the soot layer with keeping the pores by putting dehydration gas into the deposition tube; and sintering the soot layer by heating the deposition tube at a temperature over the soot sintering temperature.

Abstract: An electrodeposited copper foil to be laminated on an insulation substrate for a printed circuit board, comprising a barrier layer of ternary alloy of Zn—Co—As formed on the copper foil, is provided. Further, a surface treatment method of an electrodeposited copper foil for a printed circuit board, comprising electrolytically treating the copper foil in an electrolytic solution containing pyrophosphoric acid potassium of about 10 g/l to about 200 g/l, Zn of about 0.1 g/l to about 20 g/l, Co of about 0.1 g/l to about 20 g/l and As of about 0.05 g/l to about 5 g/l, is provided. Further, the electrolytic solution remains at the temperature of about 20° C. to about 50° C. and a pH of about 9 to about 13. The copper foil is electrolytically treated for about 2 seconds to about 20 seconds at a cathode current density of about 0.5 A/dm2 to about 20 A/dm2.

Abstract: A surface treatment method for increasing adhesion of a surface of copper foil to an insulating epoxy-impregnated substrate used in printed circuit boards is provided. The method includes nodularizing a surface of an electrolytic copper foil, surface-treating the surface of the nodularized electrolytic copper foil by Zn—As alloy electrodeposition to form a Zn—As composite layer thereon, and coating the surface of the surface-treated electrolytic copper foil with a silane coupling agent mixture, whose compounding ratio of 3-aminopropyltriethoxysilane with respect to vinyltriethoxysilane is between 6:4 and 9:1. This method is very effective to prevent discoloration of copper foil caused by oxidation and the like.