• East Asian mathematical journal
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• v.38 no.4
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• pp.415-437
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• 2022

Recently, various platforms of education technology (Edu-Tech) that use artificial intelligence have been developed in the field of mathematics education. The case study in this paper reports the learning experience of a high school student who was directed to learn mathematics through the self-directed learning process provided by a mathematics learning platform using Edu-Tech with the intervention of mentoring provided by his teacher. The study found that the mentoring intervention could make an effective contribution to student's mathematics learning by playing the role of an auxiliary tool for the self-directed learning over time. In this paper, we explain the nature of the challenges that the student encountered in the process of self-directed learning and the roles that the teacher mentoring has played in this process.

• Annual Conference on Human and Language Technology
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• 2023.10a
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• pp.600-602
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• 2023

사전 학습된 언어 모델은 최근 다양한 도메인 및 응용태스크에 활용되고 있다. 하지만 언어 모델을 활용한 문장 난이도 측정 태스크에 대해서는 연구가 수행된 바 없다. 이에 본 논문에서는 교과서 데이터를 활용해 문장 난이도 데이터 셋을 구축하고, 일반 말뭉치로 훈련된 BERT 모델과 교과서 텍스트를 활용해 적응 학습한 BERT 모델을 문장 난이도 측정 태스크에 대해 미세 조정하여 성능을 비교했다.

• Journal of the Korean Society for Library and Information Science
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• v.58 no.1
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• pp.31-51
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• 2024

The purpose of this study is to propose a design model for school library based instruction under EduTech. EduTech-based education expands learning boundaries and requires new instructional environments and learning experiences for learner-centered deeper learning. Accordingly, this study modified the ADDIE model based on the system theory and presented a four-stage instructional design model (draft) consisting of 'analysis stage, preliminary learning and development stage, learning management stage, and team teaching evaluation stage.' This model reflects elements of flipped learning, the backward design model, and inquiry-based learning to develop of customized student materials and inquiry activities. In addition, the scope of learning was expanded to include prior learning, face-to-face learning, and additional learning to increase the diversity of collaboration and opportunities to utilize school library materials. Also, Several ways for school library based instruction within EduTec were proposed in terms of teacher librarians' expertise, school library space, budget, standard curriculum development, and comprehensive support system for reading education.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.649-652
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• 2009

본 논문에서는 LCD TV의 전력 소비를 절감하기 위해 백라이트 유닛을 다분할하여 디밍 제어를 수행하는 알고리즘을 제안한다. 최근 LED 백라이트 유닛을 채용한 대형 LCD TV가 출시됨에 따라서, 백라이트 유닛의 디밍 제어를 통해 LCD TV에서 전체 전력 소비를 절감하고자 하는 기술이 활발히 연구되어 왔다. 기존의 방식은 전체 화면을 MxN개의 분할로 나누어, 각 분할 영역마다 화면의 최대 밝기 정보를 추출하여 디밍 제어를 수행했지만, 본 논문에서는 각 분할영역마다 인접한 영역으로부터 간섭받는 빛의 양을 반영하여, 실제 디밍 제어 값을 다시 계산함으로써, 추가적인 전력 절감 효과를 얻을 수 있는 방식을 제안하고 성능 평가를 하였다.

• Journal of Korean Association for Spatial Structures
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• v.16 no.4
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• pp.75-82
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• 2016

Building hardware joints are welded in most cases, which have risks of fire and explosion. Besides, the secondary damage of the destruction of the welded parts can be caused by the horizontal displacement of the structure due to earthquake or wind load. This paper compared the horizontal displacement following abilities of welded building hardware and non-welded building hardware. To do this, We conducted actual formation shake table test, and checked on the horizontal displacement following ability of structure by comparing their responses to earthquake load. We made the 2m-high framework to examine the responses of the actually constructed building hardwares, and analyzed the displacement responses of the welded-typed, non-welded-typed, and cruciform bracket building hardwares. We conducted the test by increasing acceleration rate until displacement reached 40mm corresponding to allowable relative story displacement II. The result of the test showed that the building hardware using welding work made cracking and breakage on welded connections of welded building hardware, but non-welded building hardware with no use of welding work and cruciform bracket building hardware make no problem, and that non-welded building hardware is superior to that of the welded building hardware in the horizontal displacement following ability due to earthquake or wind load.

• Journal of the Korea Institute of Military Science and Technology
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• v.23 no.1
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• pp.37-42
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• 2020

This study is for a bulletproof experiment through speed acceleration of steel ball(2.385 mm) at the laboratory level. The secondary propulsion method is used for speed acceleration, which uses a sabot assembly consisting of a sabot body, a plunger, water, and a sabot cap. At the core of the secondary drive, it is important that the energy in the water of the private particle is transferred well to the steel ball. The experiment was conducted by selecting a plunger that pushes water and water charged with variables. judging that the longer the contact time, the greater the energy transferred to the steel ball. As a result of experiments with each variable, the amount of water does not affect the speed acceleration efficiency of the steel ball and, when the length of the plunger is increased by 200 %, the speed of the steel ball can be accelerated up to 130 m/s.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.521-524
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• 2005

This paper proposes a fusion algorithm which merges multiple vein pattern images into a single image, larger than those images. As a preprocessing step of template matching, during the verification of biometric data such as fingerprint image, vein pattern image of hand, etc., the fusion technique is used to make reference image larger than the candidate images in order to enhance the matching performance. In this paper, a new algorithm, called BSA (Boundary Stitching Algorithm) is proposed, in which the boundary rectilinear parts extracted from the candidate images are stitched to the reference image in order to enlarge its matching space. By applying BSA to practical vein pattern verification system, its verification rate was increased by about 10%.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.1
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• pp.29-35
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• 2023

In this paper, we propose a SW-EDU bot, a chatbot learning model for coding education by using a chatbot system. The same scenario-based models are created on the basis of Dialogflow and Kakao i Open Builder, which are representative chatbot builders. And then a SW-EDU bot is designed and implemented by selecting the builder more appropriate to our purpose. The implemented chatbot system aims to learn effective learning methods while encouraging self-direction of users by providing learning type selection, concept learning, and problem solving by difficulty level. In order to compare the usability of chatbot builders, five indicators are selected, and based on these, a builder with a comparative advantage is selected, and SW-EDU bot is implemented based on these. Through usability evaluation, we analyze the feasibility of SW-EDU bot as a learning support tool and confirm the possibility of using it as a new coding education learning tool.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.1003-1004
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• 2006

In this paper we extract the position value of the tracking object using the hierarchical optic-digital algorithm and to control the main visual angle and Pan/Tilt. And then we propose the optic-digital stereo object tracking system for adaptive extracting the moving-target.

• Proceedings of the IEEK Conference
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• 2004.06a
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• pp.183-186
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• 2004

The proposed system in this paper utilizes the SIP and self-defined control protocol to provide global wireless communication over the data link of Orbcomm system. Main processor board connected to Orbcomm communication subscriber is designed to interface with digital I/O and AD/DA convertor for various application of control and .measurement. Hardware system implemented in this paper also includes the function of real-time clock and position report using GPS receiver The experimental result of the proposed global wireless communication system is evaluated via real-time experiments, and we have confirmed it works well according to the protocol designed in this paper.