Abstract: The present invention relates to a controllable pitch propeller capable of changing a blade pitch according to the sailing conditions of a ship and, specifically, to a controllable pitch propeller having an optimal hub-to-tip diameter ratio, the propeller being capable of reducing the size of a hub so as to have a high efficiency that is close to the propulsion efficiency of a fixed pitch propeller (FPP). In order to accomplish the aforementioned objective, the present invention relates a controllable pitch propeller which comprises a hub mounted at the propelling shaft of a ship, and a blade that is mounted at the circumference of the hub and that has a variable pitch, and which is technically characterized by a H/D ratio, of diameter (H) of the propeller and diameter (D) of the hub, of 0.170-0.2.

Abstract: The present invention relates to a method and system for providing language learning services. The method of providing language learning services, according to the present invention, the method may include: activating, in response to receiving an input for acquiring a learning target image through a user terminal, a camera of the user terminal; specifying at least a portion of an image taken by the camera as the learning target image; receiving language learning information for the learning target image from a server; providing the language learning information to the user terminal; and storing, based on a request for storing of the language learning information, the language learning information in association with the learning target image, such that the learning target image is used in conjunction with learning of the language learning information.

Abstract: The present invention relates to a controllable pitch propeller capable of changing a blade pitch according to the sailing conditions of a ship and, specifically, to a controllable pitch propeller having an optimal hub-to-tip diameter ratio, the propeller being capable of reducing the size of a hub so as to have a high efficiency that is close to the propulsion efficiency of a fixed pitch propeller (FPP). In order to accomplish the aforementioned objective, the present invention relates a controllable pitch propeller which comprises a hub mounted at the propelling shaft of a ship, and a blade that is mounted at the circumference of the hub and that has a variable pitch, and which is technically characterized by a H/D ratio, of diameter (H) of the propeller and diameter (D) of the hub, of 0.170-0.2.

Abstract: Disclosed herein is a system and method for recognizing the credit card number and expiration date of a credit card using a terminal device. More specifically, the method may include the steps of (a) obtaining an image of the card through a camera, (b) performing position detection and number recognition on card numbers within the image obtained at the step (a), and (c) performs position detection and number recognition on expiration date numbers within the image obtained at the step (a). In accordance with an embodiment of the present invention, a recognition rate can be improved compared to an image processing-based technology.

Abstract: Disclosed herein is a system and method for recognizing the credit card number and expiration date of a credit card using a terminal device. More specifically, the method may include the steps of (a) obtaining an image of the card through a camera, (b) performing position detection and number recognition on card numbers within the image obtained at the step (a), and (c) performs position detection and number recognition on expiration date numbers within the image obtained at the step (a). In accordance with an embodiment of the present invention, a recognition rate can be improved compared to an image processing-based technology.