• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.805-808
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• 2014

The DBMS is a database management software system to access by people. It is an open source DBMS, such as MySQL and commercial services, such as ORACLE. Since MySQL has been acquired by Oracle, MariaDB released increase demand. NoSQL also are increasing, the trend is of interest, depending on the circumstances. Based on the same type of mass data, Depending on the performance comparison between the open source DBMS is required, and The study compared the performance between MariaDB and MongoDB. This paper proposes a DBMS for big data to process.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.351-354
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• 2014

The emergence of big data has brought many changes to the database management environment. the each amount of big data will increase, but each data size is smaller and simpler. This feature was required to a new data processing techniques. Accordingly, A variety database technology was provided to Specializing in big data processing. It is defined as NoSQL. NoSQL is how to use each different, according to the data characteristics. It is difficult to define one. In this paper, Classified according to the characteristics of each type of NoSQL Appropriate NoSQL is proposed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.5
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• pp.29-35
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• 2022

This paper proposes a fuel cell education framework installed on a Metaverse environment, which is to reduce the burden of education costs and improve the effect of education or learning. This Meta-Fuel cell platform utilizes the Unity 3D Web and enables not only theoretical education but also hands-on training. The platform was designed and developed to accommodate a variety of unit education contents, such as ppt documents, videos, etc. The platform, therdore, integrates ppt and video demonstrations for theoretical education, as well as software content "STACK-Up" for hands-on training. Theoretical education section provides specialized liberal arts knowledge on hydrogen, including renewable energy, hydrogen economy, and fuel cells. The software "STACK-Up" provides a hands-on practice on assembling the stack parts. Stack is the very core component of fuel cells. The Meta-Fuelcell platform improves the limitations of face-to-face education. It provides educators with the opportunities of non-face-to-face education without restrictions such as educational place, time, and occupancy. On the other hand, learners can choose educational themes, order, etc. It provides educators and learners with interesting experiences to be active in the metaverse space. This platform is being applied experimentally to a education project which is to develop advanced manpower in the fuel cell industry. Its improvement is in progress.

• Annual Conference of KIPS
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• 2009.04a
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• pp.871-874
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• 2009

수천 개의 센서 노드들이 센서 필드에 전개되어 있는 경우에 센서 노드의 상태를 효율적으로 관리하는 것은 매우 중요한 기술이다. 본 논문에서는 기본적으로 PEGASIS 라우팅 알고리즘을 이용하여 노드들 간의 상대 거리 정보를 수집하여 센서 노드의 위치 정보를 탐지하고 이를 이용하여 임의의 노드가 고장이 났을 경우, 데이터 전송을 원활히 하기 위한 최적의 재라우팅을 설정하는 방법을 제시하고자 한다.

• Annual Conference of KIPS
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• 2011.04a
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• pp.920-923
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• 2011

VANET에서 V2V, V2I 통신을 통해 다양한 서비스를 이용하기 위해서는 안전하고 신뢰성 있는 통신이 보장되어야 한다. 이를 위해 다양한 연구들이 진행되었으며, 기존 연구들 중 대칭키를 사용한 방법으로는 RAISE가 있다. RAISE는 대칭키를 기반으로 하였기 때문에 다른 연구들 보다 낮은 통신 및 연산 비용을 가진다. 하지만 메시지에 대한 인증을 즉시 제공하지 못하며, RSU가 불능이 되거나 존재하지 않는 환경에서는 차량이 서비스를 제공받지 못한다는 문제점이 있다. 본 논문에서는 이러한 문제점을 해결하기 위해 대칭키 기반의 그룹키와 식별자를 사용하여 메시지 인증을 제공하고, 메시지 인증과정에서 RSU에 비의존적인 인증 프로토콜을 제안한다.

• Annual Conference of KIPS
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• 2011.11a
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• pp.917-920
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• 2011

VANET은 V2V, V2I 통신을 통해 다양한 서비스를 제공하며, 차량은 여러 가지 서비스를 제공받아 안전하고 효율적인 운행을 할 수 있다. 다양한 서비스를 제공하고 이용하기 위해 안전하고 신뢰성 있는 V2V, V2I 통신이 보장되어야 하며, 이를 위해 많은 연구들이 진행되었다. 기존의 대부분의 연구들은 공개키 기반 암호시스템을 이용하였다. 하지만 VANET의 DSRC 프로토콜에 의하면 한 차량에서 짧은 순간에 매우 많은 메시지를 확인해야 하며, 따라서 매우 큰 연산량이 발생하게 된다. 또한 DSRC를 사용할 경우 서버와의 통신을 항상 보장할 수 없다. 본 논문에서는 이를 해결하기 위해 다른 통신 메커니즘의 사용을 고려한 대칭키 기반 인증 프로토콜을 제안한다.

• Journal of the Korea Convergence Society
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• v.12 no.10
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• pp.255-263
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• 2021

The purpose of this study was to identify the teaching competency for software education for young children. Teaching competency was derived through literature study and Delphi survey of expert groups. The derived competences are composed of 'selection of software education objectives-goals and educational contents', 'software curriculum planning and implementation' and 'evaluation and feedback of software curriculum'. The derived competencies were found to be 15 competencies in a total of 3 competencies groups. The relationship between the derived competencies and previous studies was discussed and implications were presented. The teaching competency derived from this study can be used for teacher education and instructional practice.

• Annual Conference on Human and Language Technology
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• 2010.10a
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• pp.22-27
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• 2010

최근 국가적 차원에서 영어교육에 대한 많은 투자가 이루어지고 있으나 기존의 주입식, 암기식 영어 교육은 회화 실력 향상에 큰 도움을 주지 못하였다. 컴퓨터를 이용한 영어교육 또한 많은 관심을 얻고 있으나 실제 의사소통을 위한 회화 학습에 대한 고려는 깊지 않으며, 주어진 흐름의 대본을 따라 단순히 읽고 반복하는 수준의 시스템만 존재하고 있다. 이러한 학습형태는 흥미 유발 동기가 약하여 사용자로 하여금 장기간 꾸준히 학습하게 만들지 못한다는 문제가 있다. 이러한 문제점에 대하여 제2언어 습득 이론에 바탕을 둔 자연어 처리 기반 몰입 환경 영어 교육 시스템을 제안한다. 이는 도메인 확장성이 뛰어난 예제 기반 대화 시스템을 3 차원 가상공간과 결합한 시스템으로 자연스러운 대화를 통한 외국어 회화 연습을 하는 과정에서 학습자의 발화 오류를 분석하고 교육적 피드백을 제공한다. 또한 현실과 비슷한 몰입 환경에서 체험형 기술을 통해 자발적인 학습을 유도하고 집중력, 기억력을 획기적으로 높이고자 한다. 본 논문에서는 영어교육 시스템의 이론적 배경, 예제 기반 대화관리, 시스템 구성요소와 동작에 대하여 중점적으로 기술하였다.

• Journal of Engineering Education Research
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• v.25 no.6
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• pp.81-92
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• 2022

The purpose of this paper was to develop an instructional design model and checklist for AI education. Literature review was conducted to derive the structure of the instructional design model. And delphi survey was conducted twice to revise and improve the elements & items of the instructional design model and checklist and to confirm the content validity of both instructional design model and the checklist. As a result, an instructional design model consisting of three main steps(Analysis - Design & Development - Implementation & Evaluation) was suggested with a detail checklist which explained what teachers need to do in each step of this instructional development model when they prepare AI education using this instructional design model. Limitations and suggestions for further studies were presented at the end of this paper.

• 재활복지
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• v.15 no.4
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• pp.351-375
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• 2011

The purpose of this study is to research the actual condition of on-line and off-line computer education in order to create more opportunities for the possibility of effective learning and u-Learning - based IT vocational education development of persons with hearing impairments. To carry out this study, we had a preliminary education of this study for a sign language interpreters who had working in a association of the deaf in Daegu, and had conducted a survey study participating for 100 persons with hearing impairments living in Daegu-Kyungbook Region. The results of this study were as follows: First, during on-line and offline education environment for persons with hearing impairments, factors such as teaching methods and contents, screen organization, learning effects, offering lecture material and subtitle, subtitle and sign language video of position and size, offering computer instructor who have a sign language interpreter with IT mentoring, on-line educational user environment setting must be considered factors for u-Learning - based IT vocational education development. Second, 74% of the subjects showed their interest in taking a course, after u-Learning contents are developed for persons with hearing impairments. Third, the subjects preferred IT device was a tablet PCs and IT certification related courses as their IT vocational education curriculum. Also, to link between professional training and job opportunity, subjects will need a IT vocational education courses such as computer intermediate and advanced levels.