Abstract: The present disclosure relates to a plurality of light-emitting materials, an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound or a specific combination of compounds according to the present disclosure as a host material and/or a dopant material, it is possible to provide an organic electroluminescent device having improved driving voltage, luminous efficiency and/or lifetime properties compared to conventional organic electroluminescent devices.

Abstract: A frame structure for a vehicle includes: an inner panel connected to a side member and defining an inner side of a rear part of the side member; an outer panel connected to a rear side of the side member and coupled to an outer side of the inner panel defining a closed cross-section together with the inner panel and defining an outer side of the rear part of the side member; an opening portion formed below the inner and outer panels partially opening the closed cross-section so that a front end of a rear suspension arm can be inserted into the opening portion; and a reinforcing member disposed in the opening portion defining the closed cross-section together with the outer panel and the inner panel and configured to close an internal space in the outer and inner panels.

Abstract: The present disclosure relates to a plurality of light-emitting materials, an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound or a specific combination of compounds according to the present disclosure as a host material and/or a dopant material, it is possible to provide an organic electroluminescent device having improved driving voltage, luminous efficiency and/or lifetime properties compared to conventional organic electroluminescent devices.

Abstract: The test circuit monitoring positive bias temperature instability (PBTI) includes a PBTI monitoring unit driven according to a power voltage, the PBTI monitoring unit outputting an output voltage having a potential that is equal to or lower than a potential of the power voltage according to a PBTI degradation rate of an NMOS transistor; and a degradation determiner for determining the PBTI degradation rate by comparing the potential of the output voltage to the potential of the power voltage.

Abstract: Disclosed is a method for preparing bio-oil, which can be used as bio heavy fuel oil and bio marine oil, from a fatty acid with high acid value.

Abstract: An Internet-of-things (IoT)-based impact pattern analysis system for a smart security window includes: an ultra-small IoT device attached to a security window and detecting an impact; a station processing a signal obtained from the ultra-small IoT device and analyzing an impact pattern; and a user terminal outputting information related to the impact pattern through an interface. The station controller processes 3-axis acceleration data to extract a feature vector and determines an impact pattern by applying a learning model. According to the embodiment of the present disclosure, by automatically determining whether an intrusion occurs by analyzing impact patterns according to various conditions and circumstances, malfunction based on an impact other than an intrusion may be reduced and an unnecessary alarm may be prevented.

Abstract: An Internet-of-things (IoT)-based impact pattern analysis system for a smart security window includes: an ultra-small IoT device attached to a security window and detecting an impact; a station processing a signal obtained from the ultra-small IoT device and analyzing an impact pattern; and a user terminal outputting information related to the impact pattern through an interface. The station controller processes 3-axis acceleration data to extract a feature vector and determines an impact pattern by applying a learning model. According to the embodiment of the present disclosure, by automatically determining whether an intrusion occurs by analyzing impact patterns according to various conditions and circumstances, malfunction based on an impact other than an intrusion may be reduced and an unnecessary alarm may be prevented.

Abstract: Disclosed is a method for preparing fatty acid alkyl ester for bio-diesel fuels by reacting a raw material containing fat with water to prepare fatty acid, and then reacting the prepared fatty acid with alcohol. The method for preparing fatty acid alkyl ester for bio-diesel fuels includes the steps of: preparing fatty acid and glycerin by an hydrolysis reaction of a raw material containing fat and water at the temperature of 200 to 280° C. and the pressure of 30 to 80 bar; carrying out a phase separation of the fatty acid and the glycerin; and carrying out an esterification reaction of the separated fatty acid and alcohol at the temperature of 200 to 350° C. and the pressure of atmospheric pressure to 35 bar.

Abstract: Disclosed is a method for preparing fatty acid alkyl ester for bio-diesel fuels by reacting a raw material containing fat with water to prepare fatty acid, and then reacting the prepared fatty acid with alcohol. The method for preparing fatty acid alkyl ester for bio-diesel fuels includes the steps of: preparing fatty acid and glycerin by an hydrolysis reaction of a raw material containing fat and water at the temperature of 200 to 280° C. and the pressure of 30 to 80 bar; carrying out a phase separation of the fatty acid and the glycerin; and carrying out an esterification reaction of the separated fatty acid and alcohol at the temperature of 200 to 350° C. and the pressure of atmospheric pressure to 35 bar.