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인공지능 교육 플랫폼 개발을 위한 기능 및 서비스 분석
김수환(Soohwan Kim),김갑수(Kapsu Kim),김성훈(Seonghun Kim),김영식(Yungsik Kim),김재현(Jaehyoun Kim),김종범(Jongbeom Kim),김한일(Hanil Kim),김현배(Hyunbae Kim),김현철(Hyeoncheol Kim),김홍래(Hongrae Kim),박다솜(Dasom Park),박선주(SunJu Pa 한국컴퓨터교육학회 2021 컴퓨터교육학회 논문지 Vol.24 No.2
본 연구는 K-12 대상의 AI 교육 플랫폼 개발을 위한 기능 및 서비스를 제안하는 연구이다. AI 교육 플랫폼 개발을 위한 로드맵을 마련하기 위해 AI 교육의 개념, 교육과정, 온라인 플랫폼 등을 분석하였고, 전문가 검토를 통해 적절성을 판단하였다. 연구결과, AI 교육 플랫폼의 활용 대상은 유아에서 성인까지 전국민을 포괄할 필요가 있으며, 제공 콘텐츠는 인공지능, 데이터과학, 윤리 등 폭넓은 내용을 다양한 학습자의 수준을 고려하여 제공할 필요가 있는 것으로 분석되었다. 기능면에서는 웹에서 실습이 가능하고 학습자의 관심과 흥미를 반영한 다양한 데이터 셋을 제공할 필요가 있는 것으로 분석되었다. 구조면에서는 학습 및 콘텐츠 관리 시스템, 체험 및 실습지원 시스템, 데이터 관리 시스템을 구축할 필요가 있는 것으로 분석되었다. This research is a study proposing functions and services for the development of an AI education platform for K-12. In order to prepare a roadmap for AI education platform development, the concept of AI education, curriculum, and online platform were analyzed, and appropriateness was determined through expert review. As a result of this study, the target of the AI education platform needs to cover the whole country from infants to adults. In addition, it was analyzed that the provided contents need to provide a wide range of contents such as artificial intelligence, data science, and ethics in consideration of the level of various learners. In terms of function, it was analyzed that it is necessary to provide various data sets that can be practiced on the web and reflect learners" interests and interests. In terms of structure, it was analyzed that it is necessary to establish a learning and content management system, an experience and practice support system, and a data management system.
골격 좌표 벡터 및 LSTM 모델을 이용한 넘어짐 검출
시종욱(Jongwook Si),손현철(Hyeoncheol Son),김다슬(Daseul Kim),김문년(Moonnyeon Kim),정지연(Jiyeon Jeong),김규리(Gyuree Kim),김영형(Younghyung Kim),김성영(Sungyoung Kim) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.12
In recent years, many countries around the world have faced the problems of aging, single-person households, and the increasing number of elderly people who live alone. These problems have led to the need for research to improve the quality of life for the elder and single-person households. In this paper, the method of detecting falls was proposed with a focus on the aspect of safety among the methods of improving the quality of life of single-person households. First, we extract key points of human skeletons based on the existing method, vectorize them to represent correlation between them, and input them into LSTM to determine whether falls have occurred. We try to enhance the performance by using only representative feature points, not all feature points. Five reference datasets were used to evaluate the performance of proposed system and performed well in most datasets.
Quenching effect of the exciton emission induced by an electric field in needle-like CdS rods
Hyeoncheol Kim,T.S. Jeong,T. S. Kim 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.2
In this paper, we studied the influence of electric fields on the exciton emissions of the needle-shaped CdS rod by using thecombined photocurrent/photoluminescence (PC/PL) spectroscopies. We observed that the exciton emission strongly dependedon the electric field while the defect-related emission weakly depended on the electric field. Intensity quenching and peak-shifteffects of the exciton spectrum were observed as the electric field increased. To explain these effects, combined PC/PLmeasurements were introduced and they showed that excitons readily interact with the PC carriers of the photocreatedelectrons and holes. This interaction reduced the number of carriers participating in recombination, and the cause of theintensity decrease was attributed to the reduced recombination of free excitons. Thus, the shift of the exciton peaks was relatedto Stark effect induced by electric field. Consequently, we extracted out that exciton–electron scattering in emission spectrawere the result of an interaction induced by the external electric field.
Thermal metamorphism of volcanic rocks on Barton Peninsula,King George Island, Antarctica
Hyeoncheol Kim,Moonsup Cho,Jong-Ik Lee 한국지질과학협의회 2002 Geosciences Journal Vol.6 No.4
Barton Peninsula is mainly composed of Tertiarymetavolcanic rocks and granodiorite. The metavolcanic rocksunderwent thermal metamorphism up to upper greenschist facies,producing calcic-amphibole (Amp), epidote, chlorite (Chl), calcite(Cc), plagioclase, prehnite and laumontite. Two metamorphic zones,Cc-Chl and Amp-Chl, are defined on the basis of mineral assem-blages (+plagioclase, quartz, opaque minerals), characterized byepidote+chlorite calcite and actinolite hornblende+epidote+chloritecalcite, respectively. The distribution coefficient of Mg-Fe* (totalFe) between actinolite and chlorite, defined by KD=(Mg/Fe*)Act/(Mg/Fe*)Chl, ranges from 0.56 to 1.03, suggesting low-pressure meta-morphism. The coexistence of actinolite and oligoclase also sup-ports low-pressure metamorphism. Chlorite geothermometry andT-XCO2 analysis suggest that metamorphic temperatures reachedca. 300oC at fluid pressures less than 1 kbar. Thermal metamor-phism in Barton Peninsula probably was associated with mag-matic-arc plutons emplaced during the Tertiary subduction of thesoutheast Pacific plate under Antarctic Peninsula.
Raman Spectroscopy and Photocurrent of GaAsN/GaAs Multiple Quantum Wells
Hyeoncheol Kim,Kyu-Hwan Shim,Tae Soo Jeong,Sukill Kang,Taek Sung Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
The Raman and photocurrent of the GaAsN/GaAs multiple quantum wells (MQWs) was studied. The Raman spectra areobserved to be dominated by the GaAs longitudinal optical (LO) phonon mode as the strongest peaks show up around287–292 cm -1 . Moreover, the weak and broad spectral features in the range of 265–270 cm -1 originate from the peaks associatedwith the GaAs transverse optical (TO) phonon mode. And, the peaks observed in the photoluminescence and thephotocurrent spectra were preliminarily assigned to electron–heavy hole (e 1 –hh) and electron–light hole (e 1 –lh) fundamentaltransitions. Two additional transitions related to MQWs region are observed other than transitions involving the ground state. The structural properties of GaAsN/GaAs MQWs were investigated by using high-resolution X-ray diff raction (HRXRD).