http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최준영(Joonyoung Choi),홍계운(Kyewoon Hong),김기덕(Kideok Kim),최대길(Daekil Choi),진형우(HyungWoo Jin),최규혁(GyuHyeok Choi) 한국멀티미디어학회 2024 멀티미디어학회논문지 Vol.27 No.1
The development of the internet and media has accelerated efforts to replace measures such as nationwide lockdowns, social isolation, and the closure of public places in response to powerful infectious diseases like COVID-19. Families of the deceased find it challenging to overcome the shock caused by sudden accidents or illnesses. In this study, based on the development of virtual reality devices and the increased recognition of Extended Reality (XR) driven by the growth of the metaverse, we planned and developed metaverse content that enables families to remember the deceased through memorial services. This approach allows memories of the deceased to be stored online, providing users with an opportunity to restore the image they most want to remember. Moreover, it enables mourning without constraints of time and space, restoring various aspects of the deceased through AI features, offering emotional comfort and relief to the grieving families.
Modified torque magnetometry to determine magnetic anisotropy
Joonyoung Choi,In Hyuk Jo,Younjung Jo 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
We present a novel method for magnetic anisotropy measurement using membrane-type surface stress sensor (MSS). This sensor has a silicon membrane supported by four beams incorporating piezoresistive paths [1]. We modified the on-chip aluminum interconnect on the MSS to obtain more magnetic information of the material and used it for torque measurement. Angle-dependent torque measurement of magnetic materials were preformed by rotating the device with respect to the applied magnetic field. Instead of one existing Wheatstone Bridge, we modified the on-chip aluminum interconnect to become two Wheatstone bridge circuits. These variations will allow simultaneous investigation of magnetic responses according to different crystallographic directions in a two-dimensional plane.
Dependence of superconductivity on the crystallinity of Nb films on Si wafers
Joonyoung Choi,Chang-Duk Kim,Younjung Jo 한국초전도저온학회 2021 한국초전도저온공학회논문지 Vol.23 No.4
Among elemental metals, niobium (Nb) has the highest superconducting transition temperature (Tc) at ambient pressure. Thus,Nb films have been used in superconducting electronics and radio frequency cavity applications. In this study, the depositionalfactors determining the crystallinity and Tc of Nb films were investigated. An Nb film grown at a sputtering temperature of 240°Cexhibited the maximum crystallinity of Nb and the minimum crystallinity of niobium oxide. X-ray photoelectron spectroscopyconfirmed a maximum atomic percent of niobium and a minimum atomic percent of oxygen. A sputtering power of 210 W and asputtering time of 50 min were the optimal conditions for Nb deposition, and the Tc of the optimized film (9.08 K) was close to thatof bulk Nb (9.25 K). Transmission electron microscopy images of the thick film directly confirmed the removal of the typicalin-plane compressive strain in the (110) plane caused by residual stress.
Dependence of superconductivity on the crystallinity of Nb films on Si wafers
Joonyoung Choi,Chang-Duk Kim,Younjung Jo 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.4
Among elemental metals, niobium (Nb) has the highest superconducting transition temperature (Tc) at ambient pressure. Thus, Nb films have been used in superconducting electronics and radio frequency cavity applications. In this study, the depositional factors determining the crystallinity and Tc of Nb films were investigated. An Nb film grown at a sputtering temperature of 240°C exhibited the maximum crystallinity of Nb and the minimum crystallinity of niobium oxide. X-ray photoelectron spectroscopy confirmed a maximum atomic percent of niobium and a minimum atomic percent of oxygen. A sputtering power of 210 W and a sputtering time of 50 min were the optimal conditions for Nb deposition, and the Tc of the optimized film (9.08 K) was close to that of bulk Nb (9.25 K). Transmission electron microscopy images of the thick film directly confirmed the removal of the typical in-plane compressive strain in the (110) plane caused by residual stress.
과학수업에서 나타나는 학생들의 행동적 참여 분석을 위한 영상 분석 도구의 개발
최준영 ( Joonyoung Choi ),나지연 ( Jiyeon Na ),송진웅 ( Jinwoong Song ) 한국과학교육학회 2015 한국과학교육학회지 Vol.35 No.2
학생은 대화뿐만 아니라 비언어적인 행동을 통해서도 수업에 참여한다. 특히 과학교실에서는 다른 교과수업과 다르게 과학기구의 사용, 관찰, 측정 등의 비언어적인 행동들이 나타난다. 그런데 학생의 행동적 참여를 분석하는 기존의 도구들은 과학교과에서 나타나는 이러한 특징적인 활동을 반영하지 못하고 있다. 본 연구는 과학교과의 학습 활동을 고려한 행동적 참여 영상 분석 도구를 개발하였다. 분석 도구를 개발하기 위하여, 첫째, 문헌연구와 초등학교 과학수업 관찰을 바탕으로 수업 중에 나타나는 학생의 행동을 14가지로 범주화하였다(자유발화, 음독, 경청하기, 묵독, 쓰기, 주의 집중하기, 손들기, 이동하기, 비참여적 움직임, 과제 움직임, 관찰하기, 측정하기, 분류하기, 실험도구 다루기). 둘째, 이를 바탕으로 ‘과학수업 중 행동적 참여 상태 분석틀’을 개발하였다. 셋째, Microsoft Excel Visual Basic을 이용하여 분석틀에 따라 학생들의 발화 여부, 시선, 몸의 움직임 등을 기록하고 분석할 수 있는 분석 도구를 개발하였다. 개발된 도구를 이용하면 수업 중학생의 각 행동이 수행된 시간과 학생의 네 가지 수업참여 상태(즉, 참여적 발화, 참여적 침묵, 비참여적 발화, 비참여적 침묵)를 파악할 수 있다. 개발된 분석 도구를 실제 과학시간의 초등학생 두 명을 대상으로 예시적으로 적용해 본 결과, 교사는 수업활동(일반, 시범실험, 실험활동)에 따라 발화의 양을 달리하였으며, 분석대상인 두 학생은 전체 수업시간 동안 참여적 침묵 상태에 있는 시간이 가장 길었다(학생 A: 63%, 학생 B: 72%). 참여적 침묵 상태에 있는 두 학생은 ‘경청하기’를 하는 시간이 가장 길었는데(학생 A: 51%, 학생 B: 42%), 교사의 발화가 상대적으로 적었던 실험활동 시간에는 오히려 ‘경청하기’를 거의 하지 않은 대신에 ‘관찰하기’를 가장 많이 하였다(학생 A: 47%, 학생 B: 53%). 개발된 분석 도구가 비언어적인 행동을 통하여 과학수업에 참여하고 있는 학생의 행동을 이해하는 데 도움을 줄 수 있을 것이라 기대한다. Students are engaged in classroom learning, and classroom learning occurs not only through conversation but also through nonverbal behavior. In science classrooms especially, there are meaningful nonverbal behaviors such as practical activities like observation and measurement. But these behaviors have not been properly investigated by existing instruments that try to measure students` engagement. This study aims to develop a new instrument for analyzing students` behavioral engagement especially in science classrooms. The method of developing the instrument was structured along three steps. First, student behaviors have been classified into fourteen categories through literature review and a series of observation of elementary science classroom. Second, based on these, a framework for analyzing student behavioral engagement has been developed. With the framework, every student moment could be labeled as Participatory Speech or Participatory Silence or Non-Participatory Speech or Non-Participatory Silence. Third, an instrument to which the framework is applied has been developed by using Microsoft Excel. As a trial, two fourth-grade students in elementary science class were analyzed with this instrument. The results of the trial analysis shows that the longest period of a science lesson was occupied by Participatory Silence (63% and 72%). Among the participatory silence, ‘listening’ was the most common (51% and 42% of the trial lesson) and ‘observing’ which is a specific behavior to science was the fourth position (17% and 17% of the trial lesson). It is expected that the developed instrument could be used in improving our understanding of the patterns of student engagement in science classrooms.
최준영(Joonyoung Choi),이송근(Songkeun Lee) 대한전기학회 2020 전기학회논문지 Vol.69 No.6
Wind power is intermittent and nonlinear. When the amount of power generation exceeding the margin of the power system generation is input from the wind power generator to the grid, disturbance may occur in the grid. Therefore, in order to operate a power system stable, it is necessary to accurately predict wind power generation. For stable system operation, short-term wind power prediction, that is, prediction of the amount of electrical power generated from 1 hour to several hours is required. In this paper, an LSTM model for each forecasted time was created and combined to predict the amount of wind power generation after 1 to 3 hours. The validity of the proposed model was proved by comparing and analyzing the prediction accuracy with the proposed model, LSTM model, and DBN model.