Abstract: An apparatus for continuously measuring the thickness of a thin material includes a main frame configured by upper and lower frames provided in a direction crossing with a movement direction of a thin material and a vertical frame which connects the upper and lower frames, upper and lower sliders moved by sliding along guide grooves formed in the upper and lower frames; an upper confocal sensor radiating light toward the thin material, and a lower confocal sensor radiating light toward the thin material, wherein the upper and lower confocal sensors are disposed on the same axis, and height measurement is performed by receiving light only at a moment when a focus coincides at a measurement position, and wherein the upper confocal sensor and the upper slider and the lower confocal sensor and the lower slider are synchronously controlled, and are controlled in conjunction with movement of the thin material.

Abstract: A ship-collision prevention system and method for preventing a collision between ships at sea including a ship-collision avoidance guiding system using a time series graphic display, and guiding system displays, in a time series graph, depicting changes in relative distance according to time with respect to respective ships and obstacles on the basis of information provided from an electronic chart display and information system (ECDIS) and a radar system, wherein, whether other ships are on portside or starboard is displayed on the basis of radar information, and a notification through an alarm or the like if a distance to a specific ship has matched a predetermined threshold value or less, and effectively preventing a collision between ships at sea, and simultaneously, enabling a simulation for a crossing event and avoidance by inputting a random value.

Abstract: The present invention relates to a ship-collision prevention system and method for preventing a collision between a ship at sea and another ship, and according to the present invention, provided is a ship-collision avoidance guiding system using a time series graphic display, and in order to solve problems of a conventional electronic chart display and information system (ECDIS) and navigation systems using the same, which have a disadvantage of a complex and unintuitive screen display because of a simple enumeration of various pieces of information on a screen, the guiding system displays, in a time series graph, changes in relative distance according to time with respect to respective ships and obstacles on the basis of information provided from the ECDIS and a radar system, wherein, in a case of ships, whether the respective ships are on portside or starboard is displayed on the basis of radar information, and if a distance to a specific ship has a predetermined threshold value or less, the guiding system

Abstract: A method for generating, operating, and using a sparse w-NAF key for encryption is disclosed. The method for generating a key comprises generating a string of a number of coefficients, in which at most one coefficient, excluding 0, among a consecutive w number of coefficients, corresponds to a positive odd integer equal to or less than 2w (w being a natural number equal to or more than 2); and outputting the generated string as a key. Accordingly, an encryption is executed through an exponential operation or scalar multiplication using a sparse w-NAF key having the scarce coefficients, excluding 0, such that an encryption pace is improved.

Abstract: A method for generating, operating, and using a sparse w-NAF key for encryption is disclosed. The method for generating a key comprises generating a string of a number of coefficients, in which at most one coefficient, excluding 0, among a consecutive w number of coefficients, corresponds to a positive odd integer equal to or less than 2w (w being a natural number equal to or more than 2); and outputting the generated string as a key. Accordingly, an encryption is executed through an exponential operation or scalar multiplication using a sparse w-NAF key having the scarce coefficients, excluding 0, such that an encryption pace is improved.