Abstract: A glass stress test method includes breaking a glass, analyzing a shape of a crack of a broken portion of the glass in a plan view, finding a breakage origin of the glass based on the shape of the crack in the plan view, analyzing a cross-section of the breakage origin, and calculating a stress of the glass based on a cross-sectional analysis result of the breakage origin. The stress of the glass is calculated as a value proportional to a floor constant defined by a condition of a floor surface disposed when the glass is broken.

Abstract: Methods and systems for executing tracking and monitoring manufacturing data of a battery are disclosed. One method includes: receiving, by a server system, sensing data of the battery from a sensing system; generating, by the server system, mapping data based on the sensing data; generating, by the server system, identification data of the battery based on the sensing data; generating, by the server system, monitoring data of the battery based on the sensing data, the identification data, and the mapping data; and generating, by the server system, display data for displaying a simulated electrode of the battery on a graphical user interface based on the monitoring data of the battery.

Abstract: The present invention relates to a wavelength locking structure for a tunable laser and a wavelength locking method for a tunable laser. According to the present invention, since it is possible to use only one element for measuring the intensity of light, the number of parts is reduced in comparison to methods of the related art, so it is possible to perform wavelength locking economically with a down-sized structure.

Abstract: The present invention relates to a wavelength locking structure for a tunable laser and a wavelength locking method for a tunable laser. According to the present invention, since it is possible to use only one element for measuring the intensity of light, the number of parts is reduced in comparison to methods of the related art, so it is possible to perform wavelength locking economically with a down-sized structure.

Abstract: Provided are a tunable wavelength filter with an embedded metal temperature sensor and an external-cavity type tunable wavelength laser module. In detail, the tunable wavelength filter with an embedded metal temperature sensor and the external-cavity type tunable wavelength laser module achieve wavelength stability by forming a metal temperature sensor using a resistance change of a metal thin film according to temperature on a point on an isothermal layer having the same temperature distribution as the optical waveguide during a process for fabricating the optical waveguide with polymer to accurately measure a temperature of an optical waveguide.

Abstract: Provided is a tunable wavelength laser module including: an external cavity type light source generating broadband light; an optical waveguide; a Bragg grating formed in the optical waveguide; a heater provided above the optical waveguide in which the Bragg grating is formed and adjusting a reflection band of the Bragg grating by a thermo-optic effect; a direction change waveguide region changing direction of optical signals obtained by the adjusted reflection band of the Bragg grating, by a predetermined angle; a 45-degree reflection part transmitting some of the optical signals direction-changed by the direction change waveguide region and escaping from the optical waveguide therethrough and reflecting the others of the optical signals in a vertical upward direction thereby; and a lens making the optical signals reflected in the vertical upward direction by the 45-degree reflection part collimated light or convergent light.

Abstract: Provided are a tunable wavelength filter with an embedded metal temperature sensor and an external-cavity type tunable wavelength laser module. In detail, the tunable wavelength filter with an embedded metal temperature sensor and the external-cavity type tunable wavelength laser module achieve wavelength stability by forming a metal temperature sensor using a resistance change of a metal thin film according to temperature on a point on an isothermal layer having the same temperature distribution as the optical waveguide during a process for fabricating the optical waveguide with polymer to accurately measure a temperature of an optical waveguide.