Abstract: The present invention is a smart golf cart system, which relates to a smart golf cart system comprising: a golf cart including a driving module and a wireless communication module, which are configured to move according to a preset signal, and configured to load a user's golf equipment; an RTK GNSS module providing GNSS information including location information of the golf cart through communication with the wireless communication module; a GIS module including a library part in which map information of a golf course is stored in advance, wherein the map information is in the form of GIS information including altitude information; and a path calculation module for calculating the path of the golf cart, wherein the path calculation module receives GNSS information of the golf cart through the RTK GNSS module to calculate an initial path, generates an avoidance path based on the GIS information of the initial path provided from the GIS module to form a reference path, and controls the driving module depending

Abstract: A device for locating a noise occurring in a steering system includes: a sound receiving unit detecting noise occurring in a steering system; a processing unit inputting data on the noise in the steering system into a neural network model that performs learning in advance and locating a position or a component at which the noise occurs in the steering system, the noise being detected by the sound receiving unit; and a storage unit in which the neural network model that performs the learning in advance is stored.

Abstract: The present invention relates to a wavelength converter apparatus for ultra-high speed optical signal process. So, the present invention (a)embodies a wavelength converter which does not need an outer pump light by composing a semiconductor optical amplifier-ring type laser and (b)provides a wavelength converter apparatus for ultra-high speed optical signal process which embodies to be always operated wavelength conversion to be always possible within the amplifying bandwidth(about 40 mm) of SOA by a wavelength-tunable optical band pass filter deposited in a laser resonator.

Abstract: The gain control device in a semiconductor optical amplifier using an optical fiber grating includes an input unit for receiving an optical signal, an output unit for outputting an amplified optical signal, and input and output optical isolators connected to the input and output units to establish paths of the input and output optical signals. The gain control device further includes a tension-controllable optical fiber grating connected to the input optical isolator for fine adjustment of a reflection peak wavelength. A semiconductor optical amplifier connected to the tension-controllable optical fiber grating is also provided to amplify the optical signal. A power supply supplies power to the semiconductor optical amplifier to drive the optical amplifier. In addition, an optical fiber grating is connected to the semiconductor optical amplifier and has a predetermined reflection peak wavelength.

Abstract: A method and apparatus for controlling gain of an optical fiber amplifier includes a plurality of optical isolators, an excitation light source, a wavelength division optical fiber coupler, and a special optical fiber. At least one of the optical isolators is disposed at both input and output ports of the optical fiber amplifier so that an input signal light can propagate in one direction. The wavelength division optical fiber coupler couples excitation light from the excitation light source to the input signal light or separates one of the excitation light and the input signal light from the other.