Abstract: A razor blade is proposed. The razor blade may include a substrate that has a substrate tip formed at an end portion and includes a first substrate facet and a second substrate facet extending from the substrate tip to both sides. The razor blade may also include a coating that is joined to the substrate and has a coating tip formed at an end portion and includes a first coating facet and a second coating facet extending from the coating tip to both sides and corresponding to the first substrate facet and the second substrate facet, respectively. The substrate may further include a third substrate facet extending from one end of the first substrate facet. A line tangential to the first substrate facet and a line tangential to the third substrate facet may not be parallel to each other.

Abstract: A razor blade is proposed. The razor blade may include a substrate including a substrate edge having a substrate tip formed at an end portion thereof. The razor blade may also include a coating layer disposed on the substrate and having a coating tip formed at the end portion thereof. The coating layer may include a pair of first facets extending from the coating tip and a pair of second facets extending from the pair of first facets. A gradient of the first facet may be smaller than that of the second facet based on a reference line passing through the substrate tip and the coating tip.

Abstract: An apparatus for analyzing influence of electromagnetic waves comprises an electromagnetic wave radiation unit configured to radiate electromagnetic waves, a drone control unit configured to transmit to a target drone control information for controlling the target drone, an information receiving unit configured to receive status information indicating an operation state of the target drone as a response to the control information and an electromagnetic wave influence analyzing unit configured to determine the influence of the electromagnetic waves on the target drone by comparing the control information and the status information.

Abstract: An apparatus for analyzing influence of electromagnetic waves comprises an electromagnetic wave radiation unit configured to radiate electromagnetic waves, a drone control unit configured to transmit to a target drone control information for controlling the target drone, an information receiving unit configured to receive status information indicating an operation state of the target drone as a response to the control information and an electromagnetic wave influence analyzing unit configured to determine the influence of the electromagnetic waves on the target drone by comparing the control information and the status information.

Abstract: An apparatus for determining a received signal level of a radio wave in a ray-tracing wave propagation environment includes a reception unit configured to receive the radio wave; and an analyzing unit configured to determine the received signal level of the radio wave in the ray-tracing wave propagation environment. Further, the analyzing unit is configured to analyze a correlation of the height and altitude of a surface roughness that recognizes the surface of a surrounding obstacle depending on the length of wavelength in the course of delivery of a received signal of the radio wave and analyze precisely the scattering of the received signal depending on the surface roughness to determine the received signal level of the radio wave when determining the received signal level.

Abstract: The present invention relates to a method and apparatus of radio link selection based on delay spread, the user equipment according to the present invention receives radio signals from neighboring multiple base stations, measures delay spread of the signals received from the multiple neighboring base stations, selects at least one base station among the neighboring base stations based on the delay spread measured, and connects a radio link with the selected at least one base station. According to the present invention, the inter-symbol interference due to delay spread can be decreased, thereby it is available to implement the maximum transmission speed in a given propagation environment.

Abstract: Provided is a method for automatically measuring propagation characteristics of millimeter radio waves and acquiring data using a simple network management protocol (SNMP) in real time. A remote server may control a transmitter control terminal and a receiver control terminal, which control a transmitter and receiver separated from each other at a predetermined distance so as to measure propagation characteristics, through a wired/wireless network using the SNMP.

Abstract: A method of providing millimeter wave band-based communication connection service, includes measuring a strength of a signal received from at least one base station that forms at least one cell; and storing signal data based on the measured strength of the signal so that the signal data is mapped to the at least one base station. Further, the method includes selecting any one base station from among the at least one base station based on the stored signal data; and connecting communication to the selected base station. Further, the method is performed on a millimeter wave band-based mobile communication terminal.

Abstract: An apparatus for determining a received signal level of a radio wave in a ray-tracing wave propagation environment includes a reception unit configured to receive the radio wave; and an analyzing unit configured to determine the received signal level of the radio wave in the ray-tracing wave propagation environment. Further, the analyzing unit is configured to analyze a correlation of the height and altitude of a surface roughness that recognizes the surface of a surrounding obstacle depending on the length of wavelength in the course of delivery of a received signal of the radio wave and analyze precisely the scattering of the received signal depending on the surface roughness to determine the received signal level of the radio wave when determining the received signal level.

Abstract: A method for ray-tracing in a wideband Gbyte Gbps communication system includes deriving scattering distribution characteristics of reflected signals reflected on a reflection plane, analyzing amplitude distribution of the scattering distribution characteristics to distinguish a specular signal and a diffuse signal, and comparing signal amplitudes of the specular signal and the diffuse signal to calculate received power of the reflected signals according to a result of the comparing.

Abstract: Disclosed is a calibration method using a vector network analyzer including: acquiring impulse responses for a direct wave and a multi-reflected wave generated by transmitting and receiving devices connected to a measuring port of the vector network analyzer; setting a gate only for an impulse response for the direct wave among the impulse responses for the acquired direct wave and multi-reflected wave; and transforming the impulse response for the direct wave to which the gate is set into a frequency domain signal and defining the transformed frequency domain signal as calibration results.

Abstract: A method for ray-tracing in a wideband Gbyte Gbps communication system includes deriving scattering distribution characteristics of reflected signals reflected on a reflection plane, analyzing amplitude distribution of the scattering distribution characteristics to distinguish a specular signal and a diffuse signal, and comparing signal amplitudes of the specular signal and the diffuse signal to calculate received power of the reflected signals according to a result of the comparing.

Abstract: Provided is an apparatus and method of predicting a radio-wave environment. The apparatus may include an arrival recognition unit to determine whether a ray emitted from a transmission unit of the ray tracing scheme arrives within a reception radius, a position determination unit to determine an arrival position where the ray arrives within the reception radius, and a processing unit to correct the reception radius by differently applying a size of the ray according to the arrival position.

Abstract: Provided is an apparatus and method of predicting a radio-wave environment. The apparatus may include an arrival recognition unit to determine whether a ray emitted from a transmission unit of the ray tracing scheme arrives within a reception radius, a position determination unit to determine an arrival position where the ray arrives within the reception radius, and a processing unit to correct the reception radius by differently applying a size of the ray according to the arrival position.

Abstract: Provided is a millimeter waveband signal receiving device and method. The millimeter waveband signal receiving method includes receiving a plurality of millimeter waveband signals via a plurality of paths, selecting a switching path from among the plurality of paths based on the plurality of received millimeter waveband signals, and setting a communication connection to the selected switching path.