영상기반 딥러닝을 이용한 창고 화재 진압 로봇

이완기 ( Wan-gi Lee ),조범연 ( Beom-yeon Cho ),이한세 ( Han-se Lee ),이강주 ( Kang-ju Lee ),김형훈 ( Hyung-hoon Kim ),심현민 ( Hyeon-min Shim ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2

화재로 발생하는 산업시설의 인명ㆍ재산 피해를 줄이고 기존 소방 설비의 단점을 보완하는 소방 로봇을 제안한다. 소방 로봇은 무인 시스템으로 설계되었으며 6개의 핵심 기능인화재 감지, 화재 진압, 현장 이동, 화재 알림, 소방서 신고, 현장 모니터링으로 구성된다. 로봇의 구성은 구동부, 제어부, 소화부로 이루어져 있으며, 각 구성 중 일부를 선정하고 테스트 통하여 화재 진압에 유효함을 증명하였다.

녹내장 누공수술후 파열된 Filtering Bleb 의 복구술 1예

이병석 , 이완기 , 손무식 ( Byung Suk Lee , Wan Ki Lee , Moo Shik Sohn ) 대한안과학회 1978 대한안과학회지 Vol.19 No.1

제 7차 교육과정 초등학교 영어교육 목표와 내용 구성의 개선 방향

이완기(Lee Won-Key) 한국초등영어교육학회 2004 초등영어교육 Vol.10 No.2

This paper is an attempt to suggest some constructive guidelines on revising the 7th national curriculum of primary English. For this, a reflection on primary ELT in Korea was made by 278 primary school teachers across Korea who have been involved in teaching primary English. On the basis of the primary teachers' reflections on the eight years' implementation of primary ELT, some points that need redressing in the current primary ELT are discussed, and accordingly some suggestions or recommendations for the future direction of the primary ELT in Korea are made. It is suggested that 1) the objectives be more specifically targeted, giving more emphasis on language achievement for years 5 & 6, and 2) the contents be reorganized by making the year 3 course a readdress program consisting mainly of basic English words and some key prefabricated expressions, and by giving more emphasis on written English in years 5 & 6.

Hertz-Mindlin 접촉 모델이 적용된 음해적 입자법을 통한 다물체 충돌해석

이완기(Wan Ki Lee),김기덕(Gi Deok Kim),변제윤(Je Yun Byun),주영석(Young Suk Joo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11

Existing Smoothed particle hydrodynamics(SPH) structural analysis model has two problems: tensile instability resulting in particle clumping and the use of non-physical artificial stress. In this study, to solve the above two issues, the structural analysis is implemented with total Lagrangian based corotated SPH, and the Hertz-Mindlin contact model is applied as the interface condition for collision of multi-body. For numerical validation of structural analysis model, dynamic behavior simulation of cantilever beam is performed. Transient analysis of deflection at the cantilever beam tip is conducted, and maximum deflection and frequency are calculated and compared with finite element method(FEM) results and analytical solution. For numerical validation of collision model, transient analysis for reaction force between two elastic rings is performed. The stress distribution and deformation shape at specific time steps are compared with the FEM results.

초등영어 성취도평가 체제구성 방안

이완기(Lee Won Key) 한국초등영어교육학회 2017 초등영어교육 Vol.23 No.1

In this paper, the researcher attempts to suggest a working model of the achievement test system of elementary English, which teachers can hopefully use or adjust autonomously for their own assessment purposes. For this, a thorough analysis of the achievement standards specified in the national curriculum was made by the current researcher and a group of 4 highly experienced primary English teachers. Furthermore, a purposeful integration of the key objectives of achievement standards of the national curriculum and the core characteristics of language communication and practical constraints involved in the current elementary English teaching settings was made. As a result, 6 assessment targets were deduced from the integration, which included interest & confidence, understanding of meaning, delivery of meaning, accuracy of word & grammar use, fluency in understanding and delivery, and task completion. Taking relevant theoretical discussions into account, both a task-specific achievement standard-based assessment scheme and a descriptive assessment scheme were developed for testing of listening, speaking, reading and writing of elementary English. The hope is that teachers can make the best use of the suggested assessment scheme, adjusting it in a variety of ways as they need.

Total Lagrangian 기반 음해적 입자법을 이용한 외팔보 동적 거동 해석

이완기(Wan Ki Lee),주영석(Young Suk Joo),김진현(Jin Kim) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.5

SPH(smoothed particle hydrodynamics)는 Lagrangian 기반 수치해석 기법이며 입자를 단위로 사용하는 무격자 방식이다. 기존 SPH 기법으로 구현된 구조해석은 두 가지 문제점을 가지고 있다. 대변형 지점에서 인장불안정으로 인한 입자 겹침 문제와 수치적 민감성으로 인하여 작은 해석간격을 사용하는 문제이다. 본 연구에서는 total Lagrangian 기반 SPH 기법으로 구조해석을 구현하여 인장불안정 문제를 해소한다. 그리고 동회전성 커널함수를 사용하고 탄성력 연산을 음해적으로 수행하여 보다 큰 해석간격을 사용하여도 해석이 발산하지 않도록 한다. 외팔보 동적 거동 해석을 수행하여 수치모델 정확성을 검증하고 구조해석 적용 가능성을 확인한다. Smoothed particle hydrodynamics (SPH) is a particle-based meshless Lagrangian numerical method. The status quo SPH-based structural analysis has two problems: overlapping particles at large deformation points owing to tensile instability and marginal limits on the time-step size owing to the inherent numerical sensitivity. In this study, a total Lagrangian SPH method is employed in the structural analysis to solve the tensile instability problem. In addition, simulation divergence is prevented even when a relatively larger time-step is used by performing a numerical analysis implicitly and using a corotated kernel function. Dynamic analyses of cantilever beams are performed to verify the accuracy of the numerical model presented in this study and its applicability to structure analysis.

밀레니얼 세대의 Babywearing 제품에 대한 인식: 텍스트 분석 접근

이완기(Wan-Gee Lee),박명자(Myung-Ja Park),이규혜(Kyu-Hye Lee) 한국의상디자인학회 2021 한국의상디자인학회지 Vol.23 No.2

수능영어 절대점수제의 건설적 발전 방향 모색

이완기(Lee, WonKey) 한국영어평가학회 2015 영어평가 Vol.10 No.1

The purpose of this paper is to suggest a constructive reform measure for the absolute scoring system of the Korean scholastic ability test, which the Ministry of Education announced would be implemented from the 2018 school year. A close look at the MOEproposed score report system of the KSAT revealed that the proposed score report system is far from a genuine criterion-referenced system. In this paper, it is strongly argued that the national curriculum should include the overall English proficiency standards to make the KSAT and school education more effective and more educational. Thus, a suggestion is made on how to create the overall English proficiency standards for Korean students.

영어 말하기 능력 평가척도 비교 연구: ACTFL Proficiency Guidelines를 중심으로

이완기(Lee, WonKey),최인철(Choi, Inn-Chull),조동완(Cho, Dongwan),차경환(Cha, Kyungwhan) 한국영어평가학회 2011 영어평가 Vol.6 No.1

As the testing of English speaking ability is becoming necessary and important in Korea today, the speaking rating scales are also drawing attention from people concerned. The rating scales are a point of reference in assessing test takers’ speaking performance. Raters are required to refer only to the pre-published rating scales in order to reduce the subjectivity in rating. In this paper it is attempted to compare seven of widely-used English speaking rating scales with each other and align the proficiency level that each scale is representing. As the base of the comparison, the ACTFL proficiency guidelines-speaking is going to be used, and 6 other scales are going to aligned with the ACTFL proficiency guidelines-speaking. The comparative places of each rating scale are presented in this paper.

서울시 초등교원 임용고사 영어 지필시험의 타당도 연구

이완기 ( Won Key Lee ) 서울敎育大學校 初等敎育硏究所 2016 한국초등교육 Vol.27 No.1

학교 안에서의 시험은 주로 성취도 평가이지만, 학교 밖의 평가는 대부분 선발평가이다. 학교에서는 교수·학습의 결과 학생이 무엇을 얼마나 잘 알고 있는가를 점검하는 것이 중요하지만, 교수·학습과 직접적인 관련이 적은 학교 밖의 시험은 대부분 특정 목적을 위해 필요한 수의 사람을 뽑기 위해서 시행한다 (예: 입학시험, 입사시험, 승진시험 등). 그래서 학교밖의 시험은 시험 시행상의 객관성, 공정성에 밀려, 그 시험의 타당도가 뒷전으로 밀리는 경우가 허다하게 발생한다. 타당도란 어떤 시험이 전체적으로 그 시험의 목적에 부합하는 정도를 가리킨다. 본 연구는 학교밖의 시험에 해당하는 서울시 초등교원 임용고사 영어 지필시험이 어느 정도의 타당도, 즉 목적부합도를 갖추고 있는가에 대한 관심에서 출발하였다. 서울시 교육청에서 시행하는 임용고사에 합격하여 현직에 종사하고 있는 28명의 초등교사들이 본 연구에 참여하여, 2013~2015년 3년간의 임용고사 영어 지필시험 문제를 심층 분석하고, 그 분석의 결과에 대해 초등교육 전문가로서의 의견을 자유롭게 제시하였다. 28명의 교사들이 11개의 질문에 대한 리커트 질문지에 응답하고, 또 시험 문제에 대해 자유롭게 의견을 개진하였다. 이러한 질문지 조사 결과와 자유롭게 제시된 전문가적 의견을 종합, 정리하여 서울시 초등교원 임용고사 영어 지필시험의 내용타당도, 구인타당도, 안면타당도를 가늠해 보았다. 이 연구 결과를 앞으로 임용고사 출제에 참고자료로 활용한다면 보다 향상된 타당도를 가진 시험을 시행할 수 있을 것으로 기대된다. This paper is an attempt to investigate the validity of the primary teacher employment test administered by Seoul Metropolitan Office of Education. 28 experienced primary teachers participated in the works of analyzing and evaluating the primary teacher employment tests which were administered in 2013, 2014, and 2015. They were all familiar and conversant with the teacher employment test because they took the test years ago, depending on their teaching experiences. The outcome is that the tests of the last 3 years were seen rather unsatisfactory in content, construct and face validity. The results suggest the points that should be improved and the ways the test can be improved in a variety of aspects. The research results strongly suggest a total overhaul of the current employment test system, not patching the matter up. ELT experts and test policy makers should, it is recommended, collaborate, putting the validity before the practicality, to make the test more valid and effective.