Abstract: Disclosed are novel compounds of Chemical Formula 1, optical isomers of the compounds, and pharmaceutically acceptable salts of the compounds or the optical isomers. The compounds, isomers, and salts exhibit excellent activity as GLP-1 receptor agonists. In particular, they, as GLP-1 receptor agonists, exhibit excellent glucose tolerance, thus having a great potential to be used as therapeutic agents for metabolic diseases. Moreover, they exhibit excellent pharmacological safety for cardiovascular systems.

Abstract: According to the invention, there are provided a system, a method and a computer program for producing an implant placing guide. In some embodiments, a method might include acquiring a three-dimensional intraoral image by a CT scan in a state where a guide tray filled with an impression material is inserted into an oral cavity of a patient and receiving implant planning information on the three-dimensional image. The method may continue by matching an image of the guide tray and the three-dimensional image by using marker information of the guide tray and locating a guide hole on the image of the guide tray. Next, the method may continue by generating an implant-placing-guide processing file by using the image of the guide tray in which the guide hole is located. According to the invention, a time for producing an implant placing guide is significantly shortened improving patient experience.

Abstract: An apparatus for generating extreme ultraviolet light includes a droplet generator which provides a droplet to react with light from a light source to generate extreme ultraviolet light, a droplet collector which collects the droplet, and a droplet detector which includes a plurality of pressure sensors, the pressure sensors detect a position of the droplet provided to the droplet collecting unit.

Abstract: An apparatus for generating extreme ultraviolet light includes a droplet generator which provides a droplet to react with light from a light source to generate extreme ultraviolet light, a droplet collector which collects the droplet, and a droplet detector which includes a plurality of pressure sensors, the pressure sensors detect a position of the droplet provided to the droplet collecting unit.