Abstract: A wafer manufacturing method, an epitaxial wafer manufacturing method, and a wafer and epitaxial wafer manufactured thereby, are provided. The wafer manufacturing method enables the manufacture of a wafer with a low density of micropipe defects and minimum numbers of particles and scratches. The epitaxial wafer manufacturing method enables the manufacture of an epitaxial wafer that has low densities of defects such as downfall, triangular, and carrot defects, exhibits excellent device characteristics, and improves the yield of devices.

Abstract: A wafer manufacturing method, an epitaxial wafer manufacturing method, and a wafer and epitaxial wafer manufactured thereby, are provided. The wafer manufacturing method enables the manufacture of a wafer with a low density of micropipe defects and minimum numbers of particles and scratches. The epitaxial wafer manufacturing method enables the manufacture of an epitaxial wafer that has low densities of defects such as downfall, triangular, and carrot defects, exhibits excellent device characteristics, and improves the yield of devices.

Abstract: The present inventive concept relates to a virtual golf device comprising a display part showing a virtual golf course and a virtual golf ball, and a calculation part calculating a movement of the virtual golf ball corresponding to a real golf ball on the virtual golf course when a user hits the real golf ball. The display part provides an information section showing information related to a green region with a target point. If a location of the virtual golf ball on the virtual golf course before the user hits the real golf ball is named a first location, a location of the target point is named a second location and a direction from the first location to the second location is named a first direction, the information section shows a distance between the second location and an intersection point where an imaginary line passing the target point and having a second direction perpendicular to the first direction meets a border of the green region.

Abstract: The present invention relates to a virtual golf device and a virtual sports device. The virtual sports device comprises a play area in which a user who plays virtual sports is located, a display area in which a content image is displayed, and an image providing unit for projecting the content image onto the display area to provide the content image to the user.

Abstract: The present invention relates to a golf ball location ascertaining method and a golf play information providing system. The golf ball location ascertaining method comprises a first step of ascertaining a motion location at which a predetermined motion is taken when a golfer located near a golf ball on a golf field takes the predetermined motion, and a second step of ascertaining the location of the golf ball on a golf course by using golf course data on the golf field and the motion location.

Abstract: The present invention relates to a virtual sports system and a virtual sports device that may be used in the virtual sports system. The virtual sports system comprises a terminal device, a service device accessible by the terminal device and a virtual sports device communicatively connected to the service device, wherein when a user requests to provide content through the terminal device, information on the requested content is delivered to the virtual sports device through the service device, and the virtual sports device provides the content to another user playing in the virtual sports device.

Abstract: The present inventive concept relates to a virtual golf device, a virtual golf system and a method for operating a virtual golf device. The virtual golf device comprises a control part calculating a trajectory of a real golf ball when a user hits the real golf ball, and a display part displaying a virtual golf ball corresponding to the real golf ball hit by the user and moving according to the calculated trajectory in a virtual golf course. In this virtual golf device, the user can select one play mode of a first mode and a second mode, there are a plurality of users, an order of hitting the real golf ball between the plurality of users in the first mode depends on a location of each user's virtual golf ball in the virtual golf course, and an order of hitting the real golf ball between the plurality of users in the second mode does not depend on the location of each user's virtual golf ball in the virtual golf course.

Abstract: The present inventive concept provides a virtual sports simulation device comprising a screen and a control part. The screen displays a background picture for a virtual sport and a virtual ball, and a control part performs simulation about a trajectory of the virtual ball based on a result of hitting a real ball if a user hits the real ball. The virtual ball is displayed on the screen after the real ball hit by the user collides with the screen and the virtual ball on the screen moves along the simulated trajectory.