Abstract: A hybrid catalyst composition containing a heterogeneous transition metal compound, a catalyst for olefin polymerization containing the heterogeneous transition metal compound, and a method for preparing an olefin-based polymer in which generation of a gel is suppressed using the catalyst are disclosed. The method for preparing an olefin-based polymer can provide an olefin-based polymer in which non-uniformity of the olefin-based polymer, and in particular, generation of a gel is suppressed.

Abstract: Disclosed is an amplification circuit, which includes a first amplifier that receives an external signal and performs first band pass filtering on the external signal to output a first filter signal, and a second amplifier that receives the first filter signal and performs second band pass filtering on the first filter signal to output a second filter signal, and a frequency pass bandwidth of the second band pass filtering is narrower than a frequency pass bandwidth of the first band pass filtering.

Abstract: A hybrid communication device, an operation method thereof, and a communication system including the same are provided. The hybrid communication device includes a contact unit that includes an antenna for receiving a first communication signal and an electrode for receiving a second signal, a switch controller that includes a first switch and a second switch and controls the first switch and the second switch based on a change in capacitance of the electrode, and a signal processing unit that receives at least one of the first communication signal and the second communication signal from the contact unit via the first switch and processes the received signal. The first switch is connected to the contact unit, and the signal processing unit is connected to the first switch.

Abstract: An ellipsometer for aligning incident angle comprising: a main frame shaping half circle and flat surface on which a plurality of grooves are radial and circumferential directionally carved; a specimen stage, which is installed at the groove-caved surface of the main frame, for tilting a specimen on a upper surface of the specimen stage with respect to horizontal direction and translating the specimen upward and downward; a polarizing unit, which is capable of fixing and moving on the groove-carved surface of the main frame, for polarizing a light from a light source and outputting the polarized light to the specimen, and moving on the groove-carved surface; and a light detecting unit, which is capable of fixing and moving on the groove-carved surface, for a reflection light from the specimen.

Abstract: An ellipsometer for aligning incident angle comprising: a main frame shaping half circle and flat surface on which a plurality of grooves are radial and circumferential directionally carved; a specimen stage, which is installed at the groove-caved surface of the main frame, for tilting a specimen on a upper surface of the specimen stage with respect to horizontal direction and translating the specimen upward and downward; a polarizing unit, which is capable of fixing and moving on the groove-carved surface of the main frame, for polarizing a light from a light source and outputting the polarized light to the specimen, and moving on the groove-carved surface; and a light detecting unit, which is capable of fixing and moving on the groove-carved surface, for a reflection light from the specimen.