Abstract: Provided a method of predicting permeability of porous material based on anisotropic flow model. The method of predicting permeability of porous material based on anisotropic flow model comprises: providing a porous medium; establishing a concentric annulus flow model for the porous medium; calculating a concentric annulus cylinder interstitial flow velocity, a concentric annulus cylinder hydraulic tortuosity, and a concentric annulus cylinder hydraulic diameter using the concentric annulus flow model; and predicting a permeability for the porous medium using the concentric annulus cylinder hydraulic tortuosity and the concentric annulus cylinder hydraulic diameter.

Abstract: Provided a method for predicting permeability according to the geometrical change in a porous medium on the basis of a superficial effective diameter, wherein the permeability according to geometrical changes in the porous medium is precisely predicted. The method for predicting permeability according to geometric change in the porous medium comprises: providing a porous medium; obtaining first porosity and first permeability at a plurality of points of the porous medium, respectively; calculating a first superficial effective diameter using the first porosity and the first permeability; establishing a first correlation between the first porosity and the first superficial effective diameter, a second correlation between the first permeability and the first superficial effective diameter, and a third correlation between the first porosity and the first permeability; and using the correlations to predict a second permeability for a second porosity changed by a geometrical change in the porous medium.

Abstract: An organic compound adsorbent and a gas blowing apparatus comprising same, wherein the organic compound adsorbent has a BET specific surface area of 500 m2/g or more, and the relationship between an average diameter of unit pore inlets and an average diameter inside unit pores of the metal organic framework satisfies Equation 1: 0.4 ? x ? ( nm ) / y ? ( nm ) ? 1. [ Equation ? 1 ] wherein: x is an average diameter of a unit pore inlet of the metal organic framework; and y is an average diameter inside a unit pore of the metal organic framework, and thus even in a dynamic gas flow having a flow rate of 1 cm/sec or more, the adsorption amount and the adsorption rate of volatile organic compounds can be improved, and therefore volatile organic compounds can be efficiently adsorbed in environments having a gas flow, such as an air purifier and an air conditioner.

Abstract: The present disclosure relates to an over-voltage prevention apparatus and method of a distribution line connected with a distributed generator, which sets a range of a dispatched voltage based on a current voltage of a Pole Mounted Automatic Voltage Regulator (PVR) and a voltage at a connection point of a distributed generator to control so that the dispatched voltage is output within the corresponding range.

Abstract: Provided is a method of calculating a tortuous hydraulic diameter of a porous medium for laminar flow and turbulent flow considering a geometric feature and a friction loss feature. A method of calculating a tortuous hydraulic diameter of a porous medium, according to an embodiment of the present invention, includes providing porosity and a specific surface area of a porous medium, calculating a hydraulic diameter of the porous medium by using the porosity and the specific surface area, calculating tortuosity of the porous medium, and calculating a tortuous hydraulic diameter corresponding to a function of tortuosity, by using the hydraulic diameter and the tortuosity of the porous medium.

Abstract: Provided is a method of calculating permeability of a porous medium by using analysis of feature variables of friction flows through the porous medium for laminar and turbulent flows considering a geometric feature and a friction loss feature. A method of calculating permeability of a porous medium, according to an embodiment of the present invention, includes obtaining hydraulic diameters and friction factor-Reynolds number relationships of a plurality of reference porous media, deriving a hydraulic diameter-friction factor-Reynolds number correlation between the hydraulic diameters and the friction factor-Reynolds number relationships, and obtaining permeability of a porous medium to be predicted, by using the hydraulic diameter-friction factor-Reynolds number correlation.

Abstract: The present disclosure relates to an over-voltage prevention apparatus and method of a distribution line connected with a distributed generator, which sets a range of a dispatched voltage based on a current voltage of a Pole Mounted Automatic Voltage Regulator (PVR) and a voltage at a connection point of a distributed generator to control so that the dispatched voltage is output within the corresponding range.

Abstract: An electronic device is provided. The electronic device includes at least one processor and a memory electrically connected to the processor. The memory stores instructions, and the instructions are configured to cause the processor, when executed, to activate a voice recognition service in response receiving a specified user input, receive a voice command while activating the voice recognition service, provide a feedback for the voice command, deactivate the voice recognition service after providing the feedback, receive a voice signal distinct from the specified user input while deactivating the voice recognition service, in response to receiving the voice signal, identify whether at least a portion of the voice signal corresponds to a wake-up command that is obtained from the voice command, and in response to identifying that the at least the portion of the voice signal corresponds to the wake-up command, activate the voice recognition service.

Abstract: Provided is a method of calculating a tortuous hydraulic diameter of a porous medium for laminar flow and turbulent flow considering a geometric feature and a friction loss feature. A method of calculating a tortuous hydraulic diameter of a porous medium, according to an embodiment of the present invention, includes providing porosity and a specific surface area of a porous medium, calculating a hydraulic diameter of the porous medium by using the porosity and the specific surface area, calculating tortuosity of the porous medium, and calculating a tortuous hydraulic diameter corresponding to a function of tortuosity, by using the hydraulic diameter and the tortuosity of the porous medium.

Abstract: Provided is a method of calculating permeability of a porous medium by using analysis of feature variables of friction flows through the porous medium for laminar and turbulent flows considering a geometric feature and a friction loss feature. A method of calculating permeability of a porous medium, according to an embodiment of the present invention, includes obtaining hydraulic diameters and friction factor-Reynolds number relationships of a plurality of reference porous media, deriving a hydraulic diameter-friction factor-Reynolds number correlation between the hydraulic diameters and the friction factor-Reynolds number relationships, and obtaining permeability of a porous medium to be predicted, by using the hydraulic diameter-friction factor-Reynolds number correlation.

Abstract: An electronic device is provided. The electronic device includes at least one processor and a memory electrically connected to the processor. The memory stores instructions, and the instructions are configured to cause the processor, when executed, to activate a voice recognition service in response receiving a specified user input, receive a voice command while activating the voice recognition service, provide a feedback for the voice command, deactivate the voice recognition service after providing the feedback, receive a voice signal distinct from the specified user input while deactivating the voice recognition service, in response to receiving the voice signal, identify whether at least a portion of the voice signal corresponds to a wake-up command that is obtained from the voice command, and in response to identifying that the at least the portion of the voice signal corresponds to the wake-up command, activate the voice recognition service.

Abstract: Provided is a digital doorlock system including a doorlock configured to transmit an iBeacon signal and reduce a period of Bluetooth connection when recognizing proximity of a user terminal and a touch or a press on a keypad, wherein the doorlock is wirelessly connected to the user terminal so that an opening/closing operation of the doorlock is controlled, a user application installed in the user terminal and configured to enter a state of being capable of controlling the doorlock upon receiving the iBeacon signal and control the opening/closing operation of the doorlock when wirelessly connected to the doorlock via the user terminal, and a management server configured to provide a password for controlling the opening/closing operation of the doorlock to the user application through user authentication.

Abstract: Provided is a digital doorlock system including a doorlock configured to transmit an iBeacon signal and reduce a period of Bluetooth connection when recognizing proximity of a user terminal and a touch or a press on a keypad, wherein the doorlock is wirelessly connected to the user terminal so that an opening/closing operation of the doorlock is controlled, a user application installed in the user terminal and configured to enter a state of being capable of controlling the doorlock upon receiving the iBeacon signal and control the opening/closing operation of the doorlock when wirelessly connected to the doorlock via the user terminal, and a management server configured to provide a password for controlling the opening/closing operation of the doorlock to the user application through user authentication.

Abstract: Disclosed are a nonspecific immunostimulant composition, a preparation method thereof, and uses thereof. The composition includes 150 to 300 wt. parts of sodium silicate, 2˜8 wt. parts of sodium thiosulfate, 0.5˜2 wt. parts of sodium carbonate, 0.5˜2 wt. parts of potassium chloride, 200˜400 wt. parts of white sugar, and 300˜400 wt. parts of water, based on 100 wt. parts of potassium carbonate. The composition exhibits excellent defense against the mortality caused by AIV H5N1, thus improving the survival of infected animals. As a supplement of a formulated feed mixture for farmed aquatic organisms, the composition provides excellent immunostimulation and disease resistance so as to decrease the mass mortality of aquatic organisms and to increase productivity. Particularly, when raised with a food in mixture with the composition, livestock and farmed aquatic organisms are immunologically improved so that they can endure and are protected against epidemic diseases caused by viruses and bacteria.

Abstract: Disclosed are a nonspecific immunostimulant composition, a preparation method thereof, and uses thereof. The composition includes 150 to 300 wt. parts of sodium silicate, 2˜8 wt. parts of sodium thiosulfate, 0.5˜2 wt. parts of sodium carbonate, 0.5˜2 wt. parts of potassium chloride, 200˜400 wt. parts of white sugar, and 300˜400 wt. parts of water, based on 100 wt. parts of potassium carbonate. The composition exhibits excellent defense against the mortality caused by AIV H5N1, thus improving the survival of infected animals. As a supplement of a formulated feed mixture for farmed aquatic organisms, the composition provides excellent immunostimulation and disease resistance so as to decrease the mass mortality of aquatic organisms and to increase productivity. Particularly, when raised with a food in mixture with the composition, livestock and farmed aquatic organisms are immunologically improved so that they can endure and are protected against epidemic diseases caused by viruses and bacteria.

Abstract: A system for denitrifying exhaust gas, including a urea water injection unit for supplying urea water and air to a reaction chamber, wherein the urea water injection unit includes: an air supply unit for supplying external air to an injector through an air supply line; a urea water supply unit for supplying urea water to the injector through a urea water supply line; a water supply unit for supplying water to the injector through a water supply line connected to one side of the urea water supply line; a flow control valve for selectively supplying water or urea water to the injector through the urea water supply line; and the injector respectively connected to the air supply unit and the urea water supply unit to selectively discharge air, urea water or water to the reaction chamber through an injection nozzle.

Abstract: Disclosed is a method for preparing a deNOx catalyst for removing nitrogen oxides (NOx) included in exhaust gas and the like. One embodiment of the present invention discloses a V2O5(vanadium pentoxide)-TiO2(titanium dioxide)-based deNOx catalyst for removing nitrogen oxides through selective catalytic reduction by dry-ball-milling crystalline titanium dioxide (TiO2) powder and crystalline vanadium pentoxide (V2O5) powder.

Abstract: A system for denitrifying exhaust gas, including a urea water injection unit for supplying urea water and air to a reaction chamber, wherein the urea water injection unit includes: an air supply unit for supplying external air to an injector through an air supply line; a urea water supply unit for supplying urea water to the injector through a urea water supply line; a water supply unit for supplying water to the injector through a water supply line connected to one side of the urea water supply line; a flow control valve for selectively supplying water or urea water to the injector through the urea water supply line; and the injector respectively connected to the air supply unit and the urea water supply unit to selectively discharge air, urea water or water to the reaction chamber through an injection nozzle.

Abstract: Provided are a novel distribution automation system and its voltage control method, which can supply a stable voltage to a user by properly adjusting the settings of a control device so as to compensate for reactive power at each load terminal.