Abstract: A radon management system using a radon detector is proposed. The system includes: at least one radon detector installed in a specific space indoors or outdoors, and configured to detect in real time alpha particles present in the specific space, output a predetermined alpha particle detection signal, count for a preset measurement time to calculate and transmit an alpha particle concentration value, and transmit unique device identification information; and a radon management server configured to collect the unique device identification information and alpha particle concentration value, calculate and quantify an average value of the collected alpha particle concentration values to be converted into a database for each radon detector, store and manage the average value, compare the alpha particle concentration value and the average values of the previously stored alpha particle concentration value to each other to calculate a change amount thereof, and generate radon generation event information data.

Abstract: Disclosed are an antioxidant for fuel cells, a membrane electrode assembly including the same and a method for preparing the antioxidant. The antioxidant for fuel cells includes a core including at least one selected from the group consisting of a metal oxide (MxOk) and a complex metal oxide (MxNyOj, N and M being different metals), and an outer portion (e.g., a shell) located on or over a surface of the core and formed by performing reduction treatment of the surface of the core using a thiourea-based compound. The outer portion includes metal cations (M(x-n)+, n being a natural number of 1 or more) having a smaller oxidation number than a valency of the metal (M) of the core.

Abstract: An apparatus for measuring radon and thoron using an ionization chamber is proposed. The apparatus includes: a pump for air inflow suctioning and sending external air to at least one channel; a first sensor module outputting an alpha particle detection signal of an electrical signal by detecting alpha (?) particles discharged from radon and thoron; an air inflow delay module delaying air for a predetermined delay time and then outputting the air; a second sensor module outputting an alpha particle detection signal of an electrical signal by detecting alpha (?) particles discharged from radon and thoron; and a control module discriminating normal or abnormal alpha particle detection signals, counting the normal alpha particle detection signals discriminated for a predetermined measurement time, and calculating radioactive ray concentration values on the basis of the counted number of times of the normal alpha particle detection signals.

Abstract: Disclosed is a core for a current transformer, which forms an upper core in a round shape, and is disposed at a position lower than the center of a power line having both ends of the upper core received, thereby minimizing the stress of a magnetic path, and increases the permeability, thereby enhancing the magnetic induction efficiency. The disclosed core for the current transformer includes an upper core curved in a semi-circular shape to have a receiving groove formed therein, and having both ends extended downwards to be disposed to be spaced apart from each other and a lower core disposed on the lower portion of the upper core, and having both ends extended upwards to be disposed to face both ends of the upper core.

Abstract: A mobile device for measuring radon in groundwater is proposed. The mobile device for measuring radon in groundwater has an effect in that the mobile device enables a user to achieve the same level of reliability as the conventional technology, a previously applied separate dehumidifying device is not required in measuring the radon concentration in groundwater, and while moving from site to site, the user is able to quickly measure the radon concentration in groundwater by the mobile device with a simple configuration and low cost.

Abstract: Disclosed are an antioxidant which increases chemical durability of a polymer electrolyte membrane fuel cell (PEMFC) and a method for manufacturing the same. The antioxidant may prevent chemical degradation of the fuel cell and have improved antioxidation capability through a reduction reaction annealing process.

Abstract: Disclosed are an antioxidant for a fuel cell having a high degree of dispersion and/or distribution and excellent antioxidant capability and a membrane-electrode assembly including the same. The antioxidant includes a metal oxide and a sulfur-containing organic compound, for example, an organic compound including a sulfinic acid anion group (R—SO2?), adsorbed on the metal oxide.

Abstract: A billing system based on radon concentration pattern analysis and a method therefor is provided, the system including a radon detection device counting the output alpha particle detection signals for a predetermined measurement time to calculate a radon concentration value; and a cloud server storing generating a radon concentration pattern corresponding to the radon detection device by using a radon concentration value received from the radon detection device and calculating a cost for radon monitoring service provided to a terminal of the user, wherein the cloud server analyzes the generated radon concentration pattern and determines the periodic behavior pattern of the user for a predetermined period of time, whereby it is possible to charge a radon monitoring service fee for each user using the radon monitoring service, and the user may be motivated to frequently perform the ventilation action that reduces the radon concentration.

Abstract: Disclosed are an antioxidant for fuel cells, a membrane electrode assembly including the same and a method for preparing the antioxidant. The antioxidant for fuel cells includes a core including at least one selected from the group consisting of a metal oxide (MxOk) and a complex metal oxide (MxNyOj, N and M being different metals), and an outer portion (e.g., a shell) located on or over a surface of the core and formed by performing reduction treatment of the surface of the core using a thiourea-based compound. The outer portion includes metal cations (M(x-n)+, n being a natural number of 1 or more) having a smaller oxidation number than a valency of the metal (M) of the core.

Abstract: Disclosed are an antioxidant for fuel cells, a membrane electrode assembly including the same and a method for preparing the antioxidant. The antioxidant for fuel cells includes a core including at least one selected from the group consisting of a metal oxide (MxOk) and a complex metal oxide (MxNyOj, N and M being different metals), and an outer portion (e.g., a shell) located on or over a surface of the core and formed by performing reduction treatment of the surface of the core using a thiourea-based compound. The outer portion includes metal cations (M(x?n)+, n being a natural number of 1 or more) having a smaller oxidation number than a valency of the metal (M) of the core.

Abstract: Disclosed is an antioxidant for an electrolyte membrane of fuel cells. The antioxidant may include a support including silicon dioxide and having a nanotube shape, and a metal oxide supported on the support.

Abstract: Disclosed are a membrane electrode assembly with a sub-gasket and a manufacturing method thereof. The membrane electrode assembly includes an electrolyte membrane, the sub-gasket formed in an edge region of the electrolyte membrane to surround a central region of the electrolyte membrane, and an adhesive layer formed between the electrolyte membrane and the sub-gasket and including an adhesive material and an antioxidant. The electrolyte membrane is formed to have a flat surface in a first direction, the sub-gasket extends in the first direction and a second direction vertical to the first direction, and the antioxidant includes a metal salt hydrate.

Abstract: Provided are a core for a current transformer and a manufacturing method for the same in which high permittivity is formed in order to optimize electric power acquisition efficiency by magnetic induction at a low current. The provided method of manufacturing a core through the steps of winding a metal ribbon, heat treating a core base, impregnating, cutting and polishing, wherein after the core base which is inserted into a mold is heat treated to implement a shape, the core base separated from the mold is heat treated to manufacture the core for the current transformer having high permittivity.

Abstract: A mobile device for measuring radon in groundwater is proposed. The mobile device for measuring radon in groundwater has an effect in that the mobile device enables a user to achieve the same level of reliability as the conventional technology, a previously applied separate dehumidifying device is not required in measuring the radon concentration in groundwater, and while moving from site to site, the user is able to quickly measure the radon concentration in groundwater by the mobile device with a simple configuration and low cost.

Abstract: A radon management system using a radon detector is proposed. The system includes: at least one radon detector installed in a specific space indoors or outdoors, and configured to detect in real time alpha particles present in the specific space, output a predetermined alpha particle detection signal, count for a preset measurement time to calculate and transmit an alpha particle concentration value, and transmit unique device identification information; and a radon management server configured to collect the unique device identification information and alpha particle concentration value, calculate and quantify an average value of the collected alpha particle concentration values to be converted into a database for each radon detector, store and manage the average value, compare the alpha particle concentration value and the average values of the previously stored alpha particle concentration value to each other to calculate a change amount thereof, and generate radon generation event information data.

Abstract: Disclosed is a method of manufacturing an electrolyte membrane including an antioxidant. The method may include forming a first dispersion liquid including deionized water, a first ionomer dispersion solution and an antioxidant, and forming a second dispersion liquid including the first dispersion liquid and a second ionomer dispersion solution.

Abstract: A radon sensor device using a polyhedral-shaped ionization chamber is proposed. The radon sensor device includes: an ionization chamber having an open side and inner sides surrounded by a first conductor and generating an electrical field therein by applying bias power to the first conductor; a cover having a first side covered with a second conductor and closing the open side of the ionization chamber such that that first conductor disposed on the inner sides of the ionization chamber and the second conductor are electrically connected; a probe unit disposed in the ionization chamber and absorbing ion charges produced when alpha (?) decay occurs in the ionization chamber; and a measurement circuit detecting an alpha particle detection signal by amplifying and processing an electrical micro-signal input from the probe unit into a predetermined magnitude.

Abstract: Disclosed are an antioxidant for a fuel cell having a high degree of dispersion and/or distribution and excellent antioxidant capability and a membrane-electrode assembly including the same. The antioxidant includes a metal oxide and a sulfur- containing organic compound, for example, an organic compound including a sulfinic acid anion group (R—SO2?), adsorbed on the metal oxide.

Abstract: An apparatus for measuring radon and thoron using an ionization chamber is proposed. The apparatus includes: a pump for air inflow suctioning and sending external air to at least one channel; a first sensor module outputting an alpha particle detection signal of an electrical signal by detecting alpha (?) particles discharged from radon and thoron; an air inflow delay module delaying air for a predetermined delay time and then outputting the air; a second sensor module outputting an alpha particle detection signal of an electrical signal by detecting alpha (?) particles discharged from radon and thoron; and a control module discriminating normal or abnormal alpha particle detection signals, counting the normal alpha particle detection signals discriminated for a predetermined measurement time, and calculating radioactive ray concentration values on the basis of the counted number of times of the normal alpha particle detection signals.

Abstract: A radon sensor device using a polyhedral-shaped ionization chamber is proposed. The radon sensor device includes: an ionization chamber having an open side and inner sides surrounded by a first conductor and generating an electrical field therein by applying bias power to the first conductor; a cover having a first side covered with a second conductor and closing the open side of the ionization chamber such that that first conductor disposed on the inner sides of the ionization chamber and the second conductor are electrically connected; a probe unit disposed in the ionization chamber and absorbing ion charges produced when alpha (?) decay occurs in the ionization chamber; and a measurement circuit detecting an alpha particle detection signal by amplifying and processing an electrical micro-signal input from the probe unit into a predetermined magnitude.