Abstract: A device and method for estimating a concentration distribution of a fluorescent tracer in a low permeability medium is proposed. The device may obtain images by photographing acrylic boxes containing respective mixtures prepared by combining and stirring each type of clay with fluorescent tracer solutions. The device may also calculate a light intensity for the fluorescent tracer solutions for each clay, derive a light intensity of each RGB channel for each type of clay, select a channel representing a gradual change in the light intensity, and derive a concentration versus intensity equation of the selected channel. The device may further obtain images by photographing a flow chamber at an early stage and late stage of diffusion, estimate a fluorescent tracer concentration by using the concentration versus intensity equation, and evaluate validity of an estimation result by comparing the estimated fluorescent tracer concentration with a modeling value.

Abstract: The present invention relates to a refrigerator, and particularly, to a refrigerator characterized by comprising: a main body which includes an outer casing and an inner casing, wherein the outer casing has an opening formed in a back panel thereof, and the inner casing is provided within the outer casing and provides, in an upper part thereof, an ice-making compartment and a refrigerator compartment, and a freezer compartment in a lower part thereof; an evaporator casing which is provided between the outer casing and the inner casing and forms an installation space in communication with the ice-making compartment and the opening; an evaporator which is installed in the installation space via the opening and provides cold air to the ice-making compartment; and an insulating cover which opens and closes the opening. Accordingly, the evaporator can be installed from the outside of the back panel of the main body, thus allowing the installation space of the evaporator casing to remain securely sealed.

Abstract: Disclosed are a carbon dioxide utilization system capable of producing electricity, hydrogen, and bicarbonate by utilizing carbon dioxide, which is a greenhouse gas, through a spontaneous electrochemical reaction without a separate external power source, and producing magnesium hydrogen carbonate by reacting the hydrogen carbonate ions with magnesium ions generated at an anode.

Abstract: The present invention relates to a refrigerator foaming jig, and particularly, to a refrigerator foaming jig and a foaming method using same, the refrigerator foaming jig including: a refrigerator outer case in which a space part, into which a heat insulating material is injected, and a refrigerating compartment, and a freezer compartment are formed; and an ice-making compartment case which is installed inside the outer case and inside which an insulating material accommodation space communicating with the space part is formed. The refrigerator foaming jig comprises: a front jig coupled to an inner case; and a variable jig inserted into the partition part, wherein the variable jig expands toward the space part and the insulating material accommodation space or contracts inward so that the distance to the partition part is adjusted. According to the above configuration, the refrigerating compartment, the freezing compartment, and the ice-making compartment are simultaneously formed as independent spaces.

Abstract: The present invention relates to a refrigerator and, specifically, to a refrigerator comprising: a main body including an outer case, and an inner case provided inside the outer case so as to provide an ice-making chamber and a refrigeration chamber in the upper part thereof and provide a freezer chamber in the lower part thereof; a dividing wall which is coupled to the inner case so as to form the ice-making chamber, and which has an insulation material accommodation space provided therein; and a space part provided between the outer case and the inner case, wherein an insulation material injected into the space part from the outside of the main body is injected over the entire insulation material accommodation space so as to be integrally foamed therein, so that the ice-making chamber is isolated from the refrigeration chamber as an insulated space, and thus the injection of the insulation material into the space part of the main body and the insulation material accommodation space of the dividing wall is i

Abstract: The present invention relates to a refrigerator and, in particular, to a refrigerator comprising: a main body comprising an outer case having an opening in a rear wall thereof, and an inner case provided in the outer case and providing an ice-making compartment and a refrigerator compartment in the upper portion thereof and a freezer compartment in the lower portion thereof; an evaporator case provided between the outer case and the inner case, and having a cold air outlet and a cold air inlet which are in communication with the ice-making compartment, and an installation space in communication with the opening; an evaporator installed, via the opening, into a rear portion of the installation space to provide cold air to the ice-making compartment; and a guide unit installed, via the opening, into the front portion of the installation space to guide cold air to circulate between the ice-making compartment and the installation space, wherein the guide unit is fixed to the evaporator case.

Abstract: The present invention relates to a refrigerator and, particularly, to a refrigerator comprising: a body which comprises an outer case having an opening formed in the rear wall thereof, and inner case provided inside the outer case to provide an ice-making compartment and a refrigerating compartment in the upper portion thereof and provide a freezing compartment in the lower portion thereof; an evaporator case which is provided between the outer case and the inner case, and has an installation space communicating with the ice-making compartment and the opening; an evaporator which is installed in the installation space through the opening to provide cold air to the ice-making compartment; and a mounting part which is recessed inward in the inner case and to which the evaporator case is mounted, whereby the evaporator case, which allows the evaporator to be installed from outside the rear of the body, can be easily mounted at an exact position between the outer case and the inner case.

Abstract: The present invention relates to a refrigerator and a method for manufacturing same and, particularly, to a refrigerator and a method for manufacturing same, wherein the refrigerator is characterized by comprising: a main body including an outer case and an inner case that is provided inside the outer case, has an ice making chamber and a refrigerating chamber provided in an upper portion thereof, and has a freezing chamber provided in a lower portion thereof; a partition wall which is coupled to the inner case to form the ice making chamber and has a heat insulating material-accommodating space provided therein; and a space part provided between the outer case and the inner case, wherein heat insulating materials are injected into and integrally foamed with the space part and the heat insulting material-accommodating space to partition the ice making chamber as a heat insulating space separate from the refrigerating chamber.

Abstract: The present invention relates to a refrigerator and, in particular, to a refrigerator comprising: a main body comprising an outer case, and an inner case provided in the outer case and providing an ice-making compartment and a refrigeration compartment on the upper side thereof and a freezer compartment on the lower side thereof; and an evaporator case provided between the outer case and the inner case, wherein the evaporator case has provided therein an installation space with a rear opening and in communication with the ice-making compartment, the evaporator case has a fan accommodation part on one side thereof and an evaporator on the other side thereof, and a fan assembly for circulating cold air supplied from the evaporator is provided in the fan accommodation part. Since both the fan assembly and the evaporator can be installed in the evaporator case which enables the evaporator to be installed from the outside in the rear of the main body, respective parts can be arranged in a compact manner.

Abstract: Disclosed is an exhaust gas purification system, including: a cathode unit including a first accommodation space, a first aqueous solution, and a cathode at least partially submerged in the first aqueous solution; an anode unit including a second accommodation space, a second aqueous solution which is basic, and a metal anode at least partially submerged in the second aqueous solution; and a connection unit configured to connect the cathode unit and the anode unit. The anode is made of aluminum (Al) or zinc (Zn), a gas containing nitrogen oxide (NOx) is injected into the first aqueous solution, the nitrogen oxide injected into the first aqueous solution reacts with water to produce nitric acid (HNO3), the nitric acid supplies hydrogen ions, and the hydrogen ions and electrons of the cathode react to produce hydrogen.

Abstract: The present invention relates to a refrigerator and, in particular, to a refrigerator characterized by comprising: a main body including an outer case and an inner case provided inside the outer case so as to provide an ice-making chamber and a refrigerating chamber in the upper part and a freezing chamber in the lower part; and a partition wall coupled to the inner case so as to form the ice-making chamber, wherein a bead portion is formed in the inner case, and a concave portion fitting the bead portion is formed in the partition wall, and thus, the assembly position of the partition wall coupled to the inner case can be more easily identified and set through the fitting of the bead portion and the concave portion.

Abstract: The present invention relates to a refrigerator and, in particular, to a refrigerator comprising: a main body comprising an outer case and an inner case which is provided inside the outer case so as to provide an ice making compartment and a refrigerator compartment at the top thereof and provide a freezer compartment at the bottom thereof; an evaporator case which has a cold air discharge port and a cold air suction port in communication with the ice making compartment, and which is provided between the outer case and the inner case; an evaporator installed in the evaporator case so as to supply cold air to the ice making compartment; and a driving unit fan duct assembly installed behind the ice making compartment. The driving unit fan assembly is characterized in that a driving unit assembly, a fan assembly, and a cold air discharge duct are modularized.

Abstract: A vehicle carpet and mat fixing device may include an upper mat fastener part; a lower mat fastener part coupled to the upper mat fastener part; an upper carpet fastener part coupled to the lower mat fastener part by an upper carpet fastener protrusion protruding toward the lower mat fastener part; and a lower carpet fastener part coupled to the upper carpet fastener part, wherein the upper mat fastener part is hooked to the lower mat fastener part by an upper mat fastener hook circumferentially formed in the upper mat fastener part to fix a mat, and the lower carpet fastener part is coupled to the upper carpet fastener part by a male hook of the lower carpet fastener part to fix a carpet.

Abstract: A vehicle carpet and mat fixing device may include an upper mat fastener part; a lower mat fastener part coupled to the upper mat fastener part; an upper carpet fastener part coupled to the lower mat fastener part by an upper carpet fastener protrusion protruding toward the lower mat fastener part; and a lower carpet fastener part coupled to the upper carpet fastener part, wherein the upper mat fastener part is hooked to the lower mat fastener part by an upper mat fastener hook circumferentially formed in the upper mat fastener part to fix a mat, and the lower carpet fastener part is coupled to the upper carpet fastener part by a male hook of the lower carpet fastener part to fix a carpet.

Abstract: Racemic or optically active D- or L-?-glycerophosphoryl choline solids are prepared from liquid type racemic or optically active D- or L-?-glycerophosphoryl choline using an organic solvent. The solids are produced at a high yield more easily through phase transformation than an existing method using a difference in solubility in a solvent.

Abstract: Disclosed herein are a graphene-based membrane and a method of manufacturing the same. The graphene-based membrane includes: monolayer graphene containing defects; a deposition layer disposed on the defects; and nanopores surrounded by the deposition layer. The method of manufacturing a graphene-based membrane includes forming a monolayer graphene sheet and partially forming a deposition layer on the graphene sheet.

Abstract: A multi-channel current control circuit and method are disclosed herein. The multi-channel current control includes an operational amplifier provided for a channel; a low pass filter provided for the channel connected to an input terminal of the operational amplifier; a mode control circuit configured to control the low pass filter to have one of predetermined time constants in accordance with predetermined current control mode; and a pulse width modulation circuit configured to generate a pulse width modulation signal provided for the channel; and transfer the pulse width modulation signal to the input terminal of the operational amplifier via the low pass filter. The operational amplifier controls a load current of the channel using an output voltage of the operational amplifier.

Abstract: Racemic or optically active D- or L-?-glycerophosphoryl choline solids are prepared from liquid type racemic or optically active D- or L-?-glycerophosphoryl choline using an organic solvent. The solids are produced at a high yield more easily through phase transformation than an existing method using a difference in solubility in a solvent.