Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.

Abstract: A ceramic electronic component includes a body including a dielectric layer and an internal electrode, and an external electrode disposed on the body and connected to the internal electrode. The dielectric layer includes a plurality of dielectric grains, and at least one of the plurality of dielectric grains has a core-dual shell structure having a core and a dual shell. The dual shell includes a first shell surrounding at least a portion of the core, and a second shell surrounding at least a portion of the first shell, and a concentration of a rare earth element included in the second shell is more than 1.3 times to less than 3.8 times a concentration of a rare earth element included in the first shell.

Abstract: The present invention relates to a multi-component host material and an organic electroluminescent device comprising the same. By comprising a specific combination of the multi-component host compounds, the organic electroluminescent device according to the present invention can provide high luminous efficiency and excellent lifespan characteristics.

Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.

Abstract: Provided is an integrated steep slope collapse simulation system including: a base; a tower provided at one end of the base; a soil tank structure having one side being connected to the tower so that the soil tank structure is inclined, the soil tank structure being filled with soil, and the soil being rammed; a work platform provided with a working stand moving along the base and moving up and down; a soil moving device supplying soil to an interior of the soil tank structure; an artificial rainfall device provided above the soil tank structure, the artificial rainfall device injecting water downward toward the soil rammed inside the soil tank structure; and an underground water reproduction device injecting water upward through the bottom surface of the soil tank structure from the underside of the soil rammed in the soil tank structure. There is an effect that it is possible to accurately analyze an actual behavior of soil in the natural environment.

Abstract: A positive active material for a rechargeable lithium battery includes a first oxide particle having a layered structure and a second oxide layer located in a surface of the first oxide particle and including a second oxide represented by the following Chemical Formula 1: MaLbOc, wherein in Chemical Formula 1, 0<a?3, 1?b?2, 3.8?c?4.2, M is at least one element selected from the group of Mg, Al, Ga, and combinations thereof, and L is at least one element selected from of group Ti, Zr, and combinations thereof.

Abstract: A positive active material for a rechargeable lithium battery includes a first oxide particle having a layered structure and a second oxide layer located in a surface of the first oxide particle and including a second oxide represented by the following Chemical Formula 1: MaLbOc, wherein in Chemical Formula 1, 0<a?3, 1?b?2, 3.8?c?4.2, M is at least one element selected from the group of Mg, Al, Ga, and combinations thereof, and L is at least one element selected from of group Ti, Zr, and combinations thereof.

Abstract: A positive active material for a rechargeable lithium battery includes a first oxide particle having a layered structure and a second oxide layer located in a surface of the first oxide particle and including a second oxide represented by the following Chemical Formula 1: MaLbOc, wherein in Chemical Formula 1, 0<a?3, 1?b?2, 3.8?c?4.2, M is at least one element selected from the group of Mg, Al, Ga, and combinations thereof, and L is at least one element selected from of group Ti, Zr, and combinations thereof.

Abstract: Provided is an integrated steep slope collapse simulation system including: a base; a tower provided at one end of the base; a soil tank structure having one side being connected to the tower so that the soil tank structure is inclined, the soil tank structure being filled with soil, and the soil being rammed; a work platform provided with a working stand moving along the base and moving up and down; a soil moving device supplying soil to an interior of the soil tank structure; an artificial rainfall device provided above the soil tank structure, the artificial rainfall device injecting water downward toward the soil rammed inside the soil tank structure; and an underground water reproduction device injecting water upward through the bottom surface of the soil tank structure from the underside of the soil rammed in the soil tank structure. There is an effect that it is possible to accurately analyze an actual behavior of soil in the natural environment.

Abstract: A positive active material for a rechargeable lithium battery includes a LiCoO2 particle. An interior of the particle has a layered structure and a surface of the particle has a spinel structure.

Abstract: A positive active material for a rechargeable lithium battery includes a lithium intercalation compound; and lithium titanium oxide represented by Chemical Formula 1 on the surface of the lithium intercalation compound surface. Li4-xMxTiyO12-z.??Chemical Formula 1 In the Chemical Formula 1, 0<x?3, 1?y?5, ?0.3?z?0.3, and M is an element selected from Mg, Al, Ga, La, Tb, Gd, Ce, Pr, Nd, Sm, Ba, Sr, Ca, and combinations thereof.

Abstract: A positive active material for a rechargeable lithium battery includes a first oxide particle having a layered structure and a second oxide layer located in a surface of the first oxide particle and including a second oxide represented by the following Chemical Formula 1: MaLbOc, wherein in Chemical Formula 1, 0<a?3, 1?b?2, 3.8?c?4.2, M is at least one element selected from the group of Mg, Al, Ga, and combinations thereof, and L is at least one element selected from of group Ti, Zr, and combinations thereof.

Abstract: Disclosed are a negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same. The negative active material includes a composite particle including a silicon particle and a carbon coating layer coated on the surface of the silicon particle and a porous space formed by the entangled carbon nanofibers, the composite particle contacting the external surface of the carbon nanofibers in the porous space of the carbon nanofiber structure, and the carbon nanofibers have a larger diameter than that of the composite particle and a diameter ranging from about 100 nm to about 2000 nm.

Abstract: A positive active material for a rechargeable lithium battery includes a LiCoO2 particle. An interior of the particle has a layered structure and a surface of the particle has a spinel structure.

Abstract: A positive active material for a rechargeable lithium battery includes a lithium intercalation compound; and lithium titanium oxide represented by Chemical Formula 1 on the surface of the lithium intercalation compound surface. Li4-xMxTiyO12-z. ??Chemical Formula 1 In the Chemical Formula 1, 0<x?3, 1?y?5, ?0.3?z?0.3, and M is an element selected from Mg, Al, Ga, La, Tb, Gd, Ce, Pr, Nd, Sm, Ba, Sr, Ca, and combinations thereof.

Abstract: A positive active material according to one embodiment has at least one singlet peak at 7Li NMR measurement. The positive active material according to one embodiment has structural stability, and thus has electrochemical properties such as cycle-life characteristics and the like.

Abstract: Disclosed are a negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same. The negative active material includes a composite particle including a silicon particle and a carbon coating layer coated on the surface of the silicon particle and a porous space formed by the entangled carbon nanofibers, the composite particle contacting the external surface of the carbon nanofibers in the porous space of the carbon nanofiber structure, and the carbon nanofibers have a larger diameter than that of the composite particle and a diameter ranging from about 100 nm to about 2000 nm.

Abstract: Disclosed herein is an apparatus for evaluating the safety of a building. The apparatus includes first and second measurement instruments which measure earthquake accelerations of the top and bottom stories, a fast Fourier transform unit which performs fast Fourier transform on the earthquake accelerations, an integration unit which double-integrates the measured earthquake accelerations and creates drift data of the top story and the bottom story, a maximum inter-story drift ratio calculation unit which calculates a maximum inter-story drift ratio, a natural frequency change rate calculation unit which determines a natural frequency of the building, and compares the natural frequency with an ambient natural frequency of the building so as to calculate a natural frequency change rate, and a building safety evaluation unit which compares the maximum inter-story drift ratio and the frequency change rate with preset evaluation criteria and outputs a result of evaluation in the safety of the building.

Abstract: The present invention relates to a water level monitoring device and method, which has an advantage of efficient water level monitoring and high device reliability by setting a portion of an area including the water area and the shore area in the image data, monitoring an area in the horizontal direction other than the vertical direction through the image, decreasing complexity by significantly reducing the computational amount over an existing vertical direction water level measuring system, excluding noises such as floating matters, irregular reflection and so on through a water level model generating process for area distinction, and generating a water level model adaptive to environmental factors such as algal bloom, muddy water and so on.

Abstract: The present invention relates to a water level monitoring device and method, which has an advantage of efficient water level monitoring and high device reliability by setting a portion of an area including the water area and the shore area in the image data, monitoring an area in the horizontal direction other than the vertical direction through the image, decreasing complexity by significantly reducing the computational amount over an existing vertical direction water level measuring system, excluding noises such as floating matters, irregular reflection and so on through a water level model generating process for area distinction, and generating a water level model adaptive to environmental factors such as algal bloom, muddy water and so on.