Abstract: The provided is an optical filter for its use. In the present invention, it is possible to provide an optical filter that effectively blocks ultraviolet ray and infrared ray and exhibits high transmittance in visible light. Furthermore, it is possible to provide an optical filter where the transmission characteristics are stably maintained even when an incident angle is changed. Moreover, it is possible to provide an optical filter that does not exhibit problems such as ripple and petal flare, and thus to provide the optical filter with excellent durability.

Abstract: An anode active material for a lithium secondary battery and a lithium secondary battery including the same are provided. The anode active material includes a plurality of composite particles, each composite particle including a silicon-based active material particle including silicon; and a carbon coating layer formed on at least a portion of a surface of the silicon-based active material particle, wherein a relative standard deviation of G/Si peak intensity ratios of a Raman spectrum as defined in Equation 1 measured for each of 50 different composite particles among the plurality of composite particles is 50% or less.

Abstract: Provided are a method for evaluating performance and a system thereof. The method according to some embodiments may include obtaining a first model trained using a labeled dataset, obtaining a second model built by performing unsupervised domain adaptation on the first model, generating pseudo labels for an evaluation dataset using the second model, wherein the evaluation dataset is an unlabeled dataset, and evaluating performance of the first model using the pseudo labels.

Abstract: An anode active material for a secondary battery according to an embodiment of the present application includes lithium-silicon composite oxide particle. The lithium-silicon composite oxide particles include at least one selected from the group consisting of Li2SiO3 and Li2Si2O5 and have a phase fraction ratio defined by Equation 1 of 1.0 or less. A content of particles having a diameter of less than 3 ?m is 5 vol % or less based on a total volume of the lithium-silicon composite oxide particles.

Abstract: Disclosed is a single-mode optical fiber suitable for and optical transmission line used in WDM (Wavelength Division Multiplexing) system, which has low dispersion slope, sufficient dispersion value and large effective section area over S-, C- and L-band (1460˜1625 nm) to enable high-speed, large-capacity signal transmission. The optical fiber uses the wavelength region from 1460 to 1625 nm, and the optical fiber also has a dispersion value of 0.1˜3.0 ps/nm-km, more preferably 0.3˜2.4 ps/nm-km, at 1460 nm, a dispersion value of 3.0˜5.5 ps/nm-km, more preferably 3.2˜5.2 ps/nm-km, at 1550 nm, and a dispersion value of 4.5˜8.0 ps/nm-km, more preferably 4.8˜7.7 ps/nm-km, at 1625 nm. In addition, the optical fiber has a dispersion slope of 0.023˜0.05 ps/nm-km2 at 1550 nm, an effective sectional area of 35˜50 ?m2 at 1550 nm, an effective section area of 35˜50 ?m2 at 1460 nm.

Abstract: Disclosed is a single-mode optical fiber suitable for and optical transmission line used in WDM (Wavelength Division Multiplexing) system, which has low dispersion slope, sufficient dispersion value and large effective section area over S-, C- and L- band (1460˜1625 nm) to enable high-speed, large-capacity signal transmission. The optical fiber uses the wavelength region from 1460 to 1625 nm, and the optical fiber also has a dispersion value of 0.1˜3.0 ps/nm-km, more preferably 0.3˜2.4 ps/nm-km, at 1460 nm, a dispersion value of 3.0˜5.5 ps/nm-km, more preferably 3.2˜5.2 ps/nm-km, at 1550 nm, and a dispersion value of 4.5˜8.0 ps/nm-km, more preferably 4.8˜7.7 ps/nm-km, at 1625 nm. In addition, the optical fiber has a dispersion slope of 0.023˜0.05 ps/nm-km2 at 1550 nm, an effective sectional area of 35˜50 ?m2 at 1550 nm, an effective section area of 35˜50 ?m2 at 1460 nm.

Abstract: A method for making an optical fiber preform having an ultimately low PMD (Polarization Mode Dispersion) through improvement of ovality is provided. This method has several collapse steps for collapsing an optical fiber preform having a clad/core deposition layer formed in a preform tube in which a rate of collapse is 0.01-0.06 mm/min at each collapsing step. By using this method, ovality and PMD of the optical fiber preform may be improved.