Abstract: Provided is an apparatus for computing a T-function based Stream Cipher (TSC)-4 stream cipher. The apparatus includes: two T-function units; and a nonlinear filter for receiving bits output from the two T-function units and generating an 8-bit output sequence per clock. Each of the T-function units includes: a first register for storing an internal state value of the lower N bits; an N-bit internal state updater for updating the internal state value of the lower N-bits stored in the first register; an intermediate result register for storing an intermediate result value output from the N-bit internal state updater; a second register for storing an internal state value of the upper M bits; and an M-bit internal state updater for updating the internal state value of the upper M bits stored in the second register using the value stored in the intermediate result register.

Abstract: A hydraulic circuit for heavy equipment is provided, which can prevent signal pressure exceeding a predetermined pressure from being formed in a pilot signal path provided in a switching valve to sense whether the switching valve has been shifted in a hydraulic system that minimizes the discharge flow rate of a hydraulic pump when a working device such as a boom is not driven.

Abstract: A hydraulic control system is disclosed, which can minimize the flow rate of a hydraulic fluid being discharged from a variable displacement hydraulic pump by using pilot pressure constantly produced by a pilot pump when a switching valve is in a neutral position, and can adjust the flow rate of the hydraulic fluid being discharged from the variable displacement hydraulic pump by using pressure produced by a pressure generator positioned at the most downstream side of a bypass passage if a separate input signal is applied to the pressure generator when the switching valve is operated.

Abstract: A hydraulic circuit for construction equipment is disclosed, which can prevent an abrupt rotation of a swing device when a switching valve for the swing device is shifted in a state that switching valves for a traveling device and a working device have been shifted.

Abstract: A hydraulic circuit for a construction machine is disclosed, which can prevent an energy loss of a hydraulic system by automatically reducing revolution of an engine when a working device such as a boom is not driven. The hydraulic circuit includes first to third hydraulic pumps, first to third switching valves for controlling hydraulic fluid fed to working devices, a fourth switching valve for controlling hydraulic fluid fed to left and right traveling devices, a confluence switching valve for selectively supply the hydraulic fluid from the third hydraulic pump to either the working devices on the first hydraulic pump side or the working devices on the second hydraulic pump side, a signal line for traveling devices, signal lines for working devices, and a shuttle valve for selecting any one of the signal pressure formed in the signal line for the traveling devices and the signal pressure formed in the signal lines for the working devices.

Abstract: Provided are an arithmetic method and apparatus for supporting Advanced Encryption Standard (AES) and Academy, Research Institute and Agency (ARIA) encryption/decryption functions. The apparatus includes: a key scheduler for generating a round key using an input key; and a round function calculator for generating encrypted/decrypted data using input data and the round key. Here, the round function calculator includes an integrated substitution layer and an integrated diffusion layer capable of performing both AES and ARIA algorithms.

Abstract: The present invention A hydraulic control valve with a regeneration function, including a main body formed of a supply fluid passage to which pressurized fluid is supplied, at least one port, a tank fluid passage for discharging the pressurized fluid to an outside storage tank, and a first regeneration fluid passage; a spool movably installed inside the main body for controlling the flow of the pressurize fluid, and including a second generation fluid passage formed therein; and a regeneration valve for returning only part of the pressurized fluid of the first regeneration fluid passage to the tank fluid passage to maintain pressure of the first regeneration fluid passage at a designated value, and for supplying the pressurized fluid to the second regeneration fluid passage, and if the pressure of the supply fluid passage is higher than a predetermined pressure, changing the pressure of the first regeneration fluid passage in accordance with a change of the pressure of the supply fluid passage.

Abstract: A hydraulic circuit for a construction machine is disclosed, which can prevent an energy loss of a hydraulic system by automatically reducing revolution of an engine when a working device such as a boom is not driven. The hydraulic circuit includes first to third hydraulic pumps, a first switching valve, a second switching valve, a third switching valve, a confluence switching valve, a first shuttle valve selecting any one of a pressure of a first signal line in which a signal pressure is formed when the third switching valve for working devices connected to the third hydraulic pump is shifted and a pressure of a second signal line in which a signal pressure is formed when a switching valve for traveling devices is shifted, and a second shuttle valve selecting any one of the pressure selected by the first shuttle valve and a pressure of a third signal line in which a signal pressure is formed when switching valves for the working devices connected to the first and second hydraulic pumps are shifted.

Abstract: Disclosed is a hydraulic control system that can minimize pressure generated by a resilient member of a second flow control device when a hydraulic fluid discharged from a hydraulic pump constantly flows to a tank through a bypass passage while a shifting valve is in the neutral position, and also can control the pressure generated by the resilient member, if necessary. The hydraulic control system includes a hydraulic chamber for applying resilient force to the resilient member provided on one side of the second flow control device. The hydraulic chamber is adapted to operate in response to an automatic deceleration signal pressure Pi when operation of the shifting valves is detected. In the case where there is no need to control the flow rate of the hydraulic fluid flowing through the bypass passage by using the second flow control device, i.e.

Abstract: The present invention A hydraulic control valve with a regeneration function, including a main body formed of a supply fluid passage to which pressurized fluid is supplied, at least one port, a tank fluid passage for discharging the pressurized fluid to an outside storage tank, and a first regeneration fluid passage; a spool movably installed inside the main body for controlling the flow of the pressurize fluid, and including a second generation fluid passage formed therein; and a regeneration valve for returning only part of the pressurized fluid of the first regeneration fluid passage to the tank fluid passage to maintain pressure of the first regeneration fluid passage at a designated value, and for supplying the pressurized fluid to the second regeneration fluid passage, and if the pressure of the supply fluid passage is higher than a predetermined pressure, changing the pressure of the first regeneration fluid passage in accordance with a change of the pressure of the supply fluid passage.

Abstract: In a hydraulic relief valve having a main poppet draining into a pressure-oil tank hydraulic fluid flowing into a sleeve from a hydraulic pump and a pilot poppet draining into the oil tank the hydraulic fluid upon the occurrence of a high pressure over a pressure value set in a back-pressure chamber of the sleeve, an annular interference-preventing projection is provided to be formed in an outer periphery of the sleeve to be placed at boundary portions of feedback paths of feedback fluid on the side of the main poppet which is drained past a throttle of the sleeve and feedback fluid on the side of the pilot poppet which is drained past a feedback fluid path formed outside the sleeve.

Abstract: A seat valve body mounted in a hydraulic line between a pump line and feeder lines to control hydraulic fluid supplied to variable throttles and to auxiliarily control hydraulic fluid flowing in a load line comprises a first seat valve having a variable control throttle displaced by a difference between a load pressure of the load line and a discharge pressure of the hydraulic pump and varying an opening area from the pump line to the feeder lines based on a displacement amount thereof, a second seat valve having a pilot variable control throttle displacing with respect to the first seat valve, determining a displacement amount of the first seat valve, and varying an opening area based on a displacement amount thereof; and a pilot spool having a pilot variable throttle determining a displacement amount of the pilot variable control throttle of the second seat valve upon switching.

Abstract: A seat valve body mounted in a hydraulic line between a pump line and feeder lines to control hydraulic fluid supplied to variable throttles and to auxiliarily control hydraulic fluid flowing in a load line comprises a first seat valve having a variable control throttle displaced by a difference between a load pressure of the load line and a discharge pressure of the hydraulic pump and varying an opening area from the pump line to the feeder lines based on a displacement amount thereof, a second seat valve having a pilot variable control throttle displacing with respect to the first seat valve, determining a displacement amount of the first seat valve, and varying an opening area based on a displacement amount thereof; and a pilot spool having a pilot variable throttle determining a displacement amount of the pilot variable control throttle of the second seat valve upon switching.

Abstract: In a hydraulic relief valve having a main poppet draining into a pressure-oil tank hydraulic fluid flowing into a sleeve from a hydraulic pump and a pilot poppet draining into the oil tank the hydraulic fluid upon the occurrence of a high pressure over a pressure value set in a back-pressure chamber of the sleeve, an interference-preventing hole is provided to be formed in an outer periphery of the sleeve to be placed at boundary portions of feedback paths of feedback fluid on the side of the main poppet which is drained past a throttle of the sleeve and feedback fluid on the side of the pilot poppet which is drained past a feedback fluid path formed outside the sleeve.