Abstract: The present invention relates to a method, system and non-transitory computer-readable recording medium for assisting listening study. According to one aspect of the invention, there is provided a method for assisting listening study, comprising the steps of: determining a plurality of weak study sentences that a user who is provided with assessment study sentences by speech fails to understand, with reference to feedback from the user; determining at least some of pronunciations or pronunciation combinations commonly included in the plurality of weak study sentences as weak pronunciations or pronunciation combinations that the user fails to understand; and determining a compensatory study course to be provided to the user, with reference to the determined weak pronunciations or pronunciation combinations.

Abstract: A method for providing information on a user's concept understanding is provided. The method includes acquiring a set of data on a user's understanding of concepts including a first concept estimated using a concept-specific understanding estimation model that is trained on the basis of concept-specific correctness/incorrectness sequence data, estimating the user's understanding of a second concept not encountered by the user using a matrix factorization algorithm on the concept-specific correctness/incorrectness sequence data represented in a matrix structure with respect to the first concept and the second concept, and visualizing the user's understanding of the first concept included in the acquired data set and the second concept on a device of the user. The concept-specific understanding estimation model is trained such that the concept understanding is estimated by assigning a greater weight to a piece of the concept-specific correctness/incorrectness sequence data generated at a later time point.

Abstract: A method for providing a correctness/incorrectness prediction for a learning question is provided. The method includes the steps of: acquiring a set of data including a user variable determined on the basis of concept-specific correctness/incorrectness sequence data of at least one user, and at least one variable related to a question and a concept associated with the user variable; and calculating a probability that a first user corresponding to a specific user variable correctly answers a first question corresponding to a specific concept, with reference to the data set.

Abstract: The present invention relates to a heat-shrinkable polyester film, which has a heat-shrinkage of 20% or more in both the longitudinal and transverse directions when treated with 80° C. water for 30 seconds and a bidirectional balance parameter in the range of 0.25 to 2.5 and exhibits an excellent properties in die-cutting and removing from a container such as a glass bottle for recycling by washing with hot water.

Abstract: The present invention relates to a heat-shrinkable polyester film, which has a heat-shrinkage of 20% or more in both the longitudinal and transverse directions when treated with 80° C. water for 30 seconds and a bidirectional balance parameter in the range of 0.25 to 2.5 and exhibits an excellent properties in die-cutting and removing from a container such as a glass bottle for recycling by washing with hot water.