Abstract: The present disclosure relates to a technology for providing one-to-many matched language learning between a language instructor and students by using online messages, where, based on the observation that questions and answers are made speedily by the native-speaking instructor whereas questions and answers are made comparatively slowly by the students who are not fluent in the foreign language, a single language instructor leaves lesson channels open for a multiple number of students simultaneously so as to utilize the limited teaching time as efficiently as possible by wasting no time and interacting with another student while a particular student prepares a question or an answer.

Abstract: We offer a method of adjusting a camera top-down angle for a mobile terminal. The method involves automatically detecting whether a mobile terminal camera is set to top-down shooting mode based on the z-axis of the mobile terminal acceleration sensor, automatically adjusting a camera orientation by means of a mobile terminal gyroscope sensor when the camera is set to top-down shooting mode, and displaying the camera orientation at the mobile terminal so that a user recognizes the camera orientation and manually adjusts it when it does not correspond to the shooting orientation.

Abstract: We offer a method of adjusting a camera top-down angle for a mobile terminal. The method involves automatically detecting whether a mobile terminal camera is set to top-down shooting mode based on the z-axis of the mobile terminal acceleration sensor, automatically adjusting a camera orientation by means of a mobile terminal gyroscope sensor when the camera is set to top-down shooting mode, and displaying the camera orientation at the mobile terminal so that a user recognizes the camera orientation and manually adjusts it when it does not correspond to the shooting orientation.