Abstract: A dual faucet with a sterile water and general water supply function includes a faucet body including a body portion, a sterile water outlet faucet connected to the body portion and through which sterile water comes, and a regular water outlet faucet connected to the body portion near the sterile water outlet faucet and through which raw water supplied from a raw water pipe line comes, and a sterile water supply unit including a casing, and an electrolytic bath module disposed in the casing and configured to produce sterile water by electrolysis of the raw water supplied from the raw water pipe line and supply the produced sterile water to the sterile water outlet faucet, wherein the operation of the electrolytic bath module is controlled to adjust an ion concentration of the sterile water according to a measured internal voltage value or a measured internal current value.

Abstract: A hologram projection apparatus according to an embodiment of the present invention includes: a hologram image projector configured to project a hologram test image for testing a hologram image onto a projection plate through a plurality of projection modules projecting R, G, and B images, respectively; an optimal angle calculation configured to calculate optimal projection angles of each of the projection modules when quality of the hologram test image does not satisfy reference quality; and a projection module adjuster configured to adjust angles of each of the projection modules to the optimal projection angles.

Abstract: A bathroom system for vitamin D synthesis includes an environmental information collection unit which collects external environment information regarding the outdoors, a user information collection unit which collects user activity information about a user's outdoor activities, a data analysis unit which analyzes the external environment information and the user activity information to derive the user's predicted amount of vitamin D synthesis, and compares the predicted amount of vitamin D synthesis with a preset reference recommended amount of vitamin D, to derive an additional amount of vitamin D synthesis, a light source for vitamin synthesis provided in a bathroom facility to irradiate light for synthesis of vitamin D in the user's body, and a light source control unit which controls the light source for vitamin synthesis according to the additional amount of vitamin D synthesis, which has been derived from the data analysis unit.