Abstract: Disclosed is an optical line monitoring system and method which detects an optical line where a disorder occurs, by using an OTDR (Optical Time Domain Reflectometer) pulse pattern with matching information. The optical line monitoring system generates and stores a reference OTDR pulse pattern matched with identification information of an optical channel service unit, and compares the matched reference OTDR pulse pattern with the OTDR pulse pattern collected at an inspection time to verify an optical line region where a disorder occurs.

Abstract: Provided is a DC power cable including a conductor, an inner semiconductive layer, an insulation and an outer semiconductive layer. In particular, the inner semiconductive layer or the outer semiconductive layer may be formed from a semiconductive composition containing a polypropylene base resin or a low-density polyethylene base resin and carbon nano tubes; and the insulation may be formed from an insulation composition containing a polypropylene base resin or a low-density polyethylene base resin and inorganic nano particles. The resulting power cable may have improved properties such as volume resistivity, hot set, and so on, and excellent space charge reducing effect.

Abstract: A security method in a physical layer and a wireless communication system using the same are provided. A wireless communication Access Point (AP) whose security has been enhanced in the physical layer includes a storage unit that manages channel bandwidth pattern data, a controller for sequentially acquiring channel bandwidth data from the channel bandwidth pattern data, a PLL controller for changing a channel bandwidth based on the acquired channel bandwidth data, and a wireless interface unit for performing wireless communication with a wireless communication terminal using the changed channel bandwidth. The channel bandwidth pattern data is identical to channel bandwidth pattern data stored in the wireless communication terminal, and the wireless communication terminal and the wireless communication AP are synchronized with each other such that the wireless communication terminal and the wireless communication AP perform wireless communication using the same channel bandwidth.

Abstract: A superconducting cable is provided. The superconducting cable includes a core part including a former disposed at the center of the core part, one or more superconducting conductive layers with each electric phase disposed at the outside of the former in a radial directions, a insulating layer disposed at the outside of each the conductive layer in a radial direction and a shielding layer disposed at the outermost of the insulating layer; and a cryostat disposed at the outside of the core part in a radial direction with first space being interposed therebetween, having a vacuum part disposed therein and electrically wired to neutral pole (N pole).

Abstract: Disclosed are enamel varnish compositions for an enamel wire and an enamel wire using the same. The present invention relates to enamel varnish compositions for an enamel wire in which a polymeric resin component is included in an organic solvent, wherein the polymeric resin component includes a first polyamideimide resin; and a second resin having polyamideimide in which a triazine ring is introduced into a major chain. The enamel wire, in which such a coating pigment composition is applied to the innermost layer, has the increased adhesivity of the insulated coating layer to the conducting wire, as well as the excellent physical properties such as the wear resistance and flexibility, etc.

Abstract: A termination structure for a superconducting cable is described. The termination structure for a superconducting cable includes a first tube including a conductive rod therein to form a room temperature section, a second tube including a conductive rod therein to form a temperature gradient section, and a spacer provided between the first and second tubes, the spacer including a conductive connector configured to connect the conductive rods inside the first and second tubes to each other. The first and second tubes are joined to be separable from each other.

Abstract: A stop joint for a superconducting cable is provided to maintain superconducting properties by installing the stop joint on a long distance line in which a long distance superconducting cable has to be installed and unitizing a circulation path of a cooling fluid.

Abstract: Disclosed herein is a temperature movable structure of a superconducting cable terminal. The superconducting cable terminal has sections of a high temperature portion, a temperature movable portion and an extremely low temperature portion. The temperature movable structure is disposed in the section of the temperature movable portion between the sections of the high temperature portion and the extremely low temperature portion. The temperature movable structure has upper and lower spacer members, a pipe body, first and third conductors, a second conductor and a contact connecting member disposed between the first and second conductors.

Abstract: An electrical transmission line for transmitting electricity is made of a composite material in which aluminum and a plurality of carbon nanotubes are combined, and a weight ratio of the carbon nanotubes to the aluminum is 0.5 to 3 wt %. The carbon nanotubes are oriented at an angle within 30° along a length direction of the electrical transmission line.

Abstract: The arrangement method of superconducting wires of a superconducting cable, includes: in a case where a refrigerator is installed at one of terminal structures provided on both sides of a superconducting cable, and a cooling fluid is passed through the superconducting cable by a pump for cooling, setting the numbers of superconducting wires of sections of the superconducting cable installed between the terminal structures on both the sides to be different depending to temperatures of the sections, wherein the numbers of superconducting wires are increased from the section of the superconducting cable having the lowest temperature to the section thereof having the highest temperature while maintaining a current-carrying capability.

Abstract: Provided is a superconducting cable device including: a first superconducting cable and a second superconducting cable; an intermediate connection box which connects the first and second superconducting cables to each other; and a cooling device which causes a coolant to flow inside the intermediate connection box in a lengthwise direction of the intermediate connection box, wherein a cable connection portion for connecting the first and second superconducting cables to each other is provided in the intermediate connection box. In an uncooled state, the cable connection portion is disposed to be eccentric from a center line in the lengthwise direction of the intermediate connection box in a direction in which the coolant flows.

Abstract: A superconducting cable terminal connection device connecting a terminal of a superconducting cable for power transmission to an external power system, includes: an electric field relaxation shield disposed inside an insulation housing; a horizontal conductor fixed to an end portion of a core of the superconducting cable drawn into the electric field relaxation shield; an insulator which coats an outer periphery of the horizontal conductor; a vertical conductor which is drawn into the electric field relaxation shield and has a through-hole through which the horizontal conductor and the insulator pass so as to be slidable in a lengthwise direction; and a flexible electrical conduction member which electrically connects an end portion of the horizontal conductor to the vertical conductor.

Abstract: Provided is a superconducting cable device including: a first superconducting cable and a second superconducting cable; an intermediate connection box which connects the first and second superconducting cables to each other; and a cooling device which causes a coolant to flow inside the intermediate connection box in a lengthwise direction of the intermediate connection box, wherein a cable connection portion for connecting the first and second superconducting cables to each other is provided in the intermediate connection box. In an uncooled state, the cable connection portion is disposed to be eccentric from a center line in the lengthwise direction of the intermediate connection box in a direction in which the coolant flows.

Abstract: A superconducting cable terminal connection device connecting a terminal of a superconducting cable for power transmission to an external power system, includes: an electric field relaxation shield disposed inside an insulation housing; a horizontal conductor fixed to an end portion of a core of the superconducting cable drawn into the electric field relaxation shield; an insulator which coats an outer periphery of the horizontal conductor; a vertical conductor which is drawn into the electric field relaxation shield and has a through-hole through which the horizontal conductor and the insulator pass so as to be slidable in a lengthwise direction; and a flexible electrical conduction member which electrically connects an end portion of the horizontal conductor to the vertical conductor.

Abstract: The arrangement method of superconducting wires of a superconducting cable, includes: in a case where a refrigerator is installed at one of terminal structures provided on both sides of a superconducting cable, and a cooling fluid is passed through the superconducting cable by a pump for cooling, setting the numbers of superconducting wires of sections of the superconducting cable installed between the terminal structures on both the sides to be different depending to temperatures of the sections, wherein the numbers of superconducting wires are increased from the section of the superconducting cable having the lowest temperature to the section thereof having the highest temperature while maintaining a current-carrying capability.

Abstract: A stop joint for a superconducting cable is provided to maintain superconducting properties by installing the stop joint on a long distance line in which a long distance superconducting cable has to be installed and unitizing a circulation path of a cooling fluid.

Abstract: A termination structure for a superconducting cable is provided. The termination structure for a superconducting cable includes a first tube including a conductive rod therein to form a room temperature section, a second tube including a conductive rod therein to form a temperature gradient section, and a spacer provided between the first and second tubes, the spacer comprising a conductive connector configured to connect the conductive rods inside the first and second tubes to each other. The first and second tubes are joined to be separable from each other.

Abstract: A communication equipment which is utilized in a power line communication (PLC) system utilizing a hybrid fiber coax (HFC) which includes a PLC optical network unit, a PLC trunk bridge amplifier, a PLC distribution amplifier, and a PLC coupling device. In this instance, the PLC optical network unit does not require a PLC protocol conversion of an Ethernet signal by a cable modem and a PLC modem in each subscriber location, and enables a PLC communication between the each subscriber location and a communication terminal utilizing a PLC Ethernet signal as is, by receiving an optical signal from an optical transmitter via an optical fiber, converting the optical signal into the PLC Ethernet signal corresponding to a predetermined PLC protocol, and transmitting the PLC Ethernet signal to at least one subscriber location via a coaxial cable.

Abstract: Provided is a DC power cable including a conductor, an inner semiconductive layer, an insulation and an outer semiconductive layer. In particular, the inner semiconductive layer or the outer semiconductive layer may be formed from a semiconductive composition containing a polypropylene base resin or a low-density polyethylene base resin and carbon nano tubes; and the insulation may be formed from an insulation composition containing a polypropylene base resin or a low-density polyethylene base resin and inorganic nano particles. The resulting power cable may have improved properties such as volume resistivity, hot set, and so on, and excellent space charge reducing effect.

Abstract: Optimum compositional elements and contents (wt %) of an aluminum alloy conductor cable are newly established to enhance rigidity against vibration and electrical conductivity of the aluminum alloy conductor cable. Further, a process for the aluminum alloy conductor cable is presented to provide an aluminum alloy conductor cable having satisfactory tensile strength (mechanical strength) and electrical conductivity.