Electrochemical Characteristics of Synthesized Nb₂O₅-Li₃VO₄ Composites as Li Storage Materials

( Youngmo Yang ),( Hyungeun Seo ),( Jae-hun Kim ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.4

The increasing demand for energy storage in mobile electronic devices and electric vehicles has emphasized the importance of electrochemical energy storage devices such as Li-ion batteries (LIBs) and supercapacitors. For reversible Li storage, alternative anode materials are actively being developed. In this study, we designed and fabricated an Nb₂O₅-Li₃VO₄ composite for use as an anode material in LIBs and hybrid supercapacitors. Nb₂O₅ powders were dissolved into a solution and the precursors were precipitated onto Li₃VO₄ through a simple, low-temperature hydrothermal reaction. The annealing process yielded an Nb₂O₅-Li₃VO₄ composite that was characterized by X-ray diffraction, electron microscopy, and X-ray photoelectron spectroscopy. Electrochemical tests revealed that the Nb₂O₅-Li₃VO₄ composite electrode demonstrated increased capacities of approximately 350 and 140 mAh g^-1 at 0.1 and 5 C, respectively, were maintained up to 1000 cycles. The reversible capacity and rate capability of the composite electrode were enhanced compared to those of pure Nb₂O₅-based electrodes. These results can be attributed to the microstructure design of the synthesized composite material.

중학생의 자기주도학습력검사(SDLAT) 개발 및 타당화

양영모(Yang, Youngmo),이경화(Lee, Kyunghwa),김수연(Kim, Suyeon) 한국교육방법학회 2018 교육방법연구 Vol.30 No.2

본 연구는 Lee, Park과 Kim(2017)이 개발하여 타당화한 대학생용 자기주도학습력검사(SDLAT)를 바탕으로 중학생용 자기주도학습력검사 문항을 개발한 후. 예비조사와 본 조사를 거쳐 검사의 타당화 작업을 실시하였다. 본 연구에서 개발된 중학생 자기주도학습력검사는 인지, 정의, 행동의 세 영역으로 구분되고, 각 영역별로 세 개의 하위요인이 포함되었다. 인지적 영역에는 ‘인지적 사고, 초인지, 문제해결력’을, 정의적 영역에는 ‘내재적 동기, 미래지향적 동기, 자기효능감’을, 행동적 영역에는 ‘도움구하기, 물리적 환경관리, 시간관리’를 하위요인으로 구성하였다. 세 개 영역의 총 아홉 개의 하위요인의 위계구조를 확인하기 위하여 첫째, 요인 간 상관관계를 분석하였으며 둘째, 탐색적 요인분석을 실시하고, 셋째, 확인적 요인분석을 실시하였다. 요인 간에는 적절한 상관이 확인되었다(.463~.783). 그리고 탐색적 요인분석을 통해 총 9개의 하위요인과 58개 문항이 확정되었으며, 확인적 요인분석을 통해 전체 위계모형(3개 영역, 9개 하위요인)의 적합도가 확인되었다. NFI, IFI, CFI 등의 적합도 지수는 모두 .80 이상을 나타냈으며, RMSEA도 .045로 전체적인 모형의 적합도는 양호하였다. 각 문항들의 표준화 회귀계수 또한 .53~.85로 양호하게 나타났다. 또한 본 도구의 전체 문항의 신뢰도는 Cronbach α .971로 신뢰도는 확보되었다. The purpose of this study was to develop the self-directed learning ability test for middle school students based on the self-directed learning ability test(SDLAT) that developed and validated by Lee, Park and Kim(2017). Statistical validation was carried out after the data were collected through preliminary and main surveys. The SDLAT for middle school students developed in this study was divided into three domains: cognition, affection, and behavior. And three sub-factors were included in each domain. The sub-factors of the cognitive domain were cognitive thinking, meta-cognition and problem solving ability, and affective domain includes the intrinsic motivation, future oriented motivation, and self-efficacy. And seeking help, physical environment management, time management were sub-factors of the behavior domain. To identify the hierarchical structure of a total of nine sub-factors in the three domains, the correlations between the factors were analyzed, exploratory factor analysis was performed, and confirmatory factor analysis was performed. In the results of this study, an appropriate correlation between the factors was confirmed (.463~.783). Through the exploratory factor analysis, 9 sub-factors and 58 items were confirmed. Through confirmatory factor analysis, the fit of the whole hierarchical model (3 domains, 9 sub-factors) was confirmed. The fit scores of NFI, IFI, and CFI were all above .80, and RMSEA was .045. The overall fit of the model was good. The standardized regression coefficient for each item was also good at .53~.85. In addition, the reliability of the SDLAT was Cronbach α .971.

미생물을 활용한 가이 수질측정 센서의 활용 방안

양영모(Youngmo Yang) 대한환경공학회 2022 대한환경공학회 학술발표논문집 Vol.2022 No.11

UTM의 고속화된 계측 처리 및 데이터 모니터링 시스템 설계

오영모 ( Youngmo Oh ),김동현 ( Donghyun Kim ),정성모 ( Sungmo Jung ),임효영 ( Hyoyoung Leem ),근소걸 ( Sogeol Geun ),양석 ( Shuo Yang ),임재현 ( Jaehyun Lim ),김치영 ( Chiyoung Kim ),김석수 ( Seoksoo Kim ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1

시스템은 자발성, 자율성, 사회성, 반응성을 갖는 독립된 프로그램인 에이전트를 조합하여 구성되는 시스템으로 일반 사용자에게 편리하고 자연수러운 메타포를 제공한다. 그러나 개발자 측면에서는 에이전트 시스템에서 요구하는 각종 기능 및 제약규칙...

후진형 행동연쇄와 최대-최소 촉구가 발달장애 아동의 일상생활 기술 수행에 미치는 효과

강영모(Kang, Youngmo),양문봉(Yang, Moonbong) 한국행동분석학회 2021 행동분석․지원연구 Vol.8 No.2

본 연구는 후진형 행동연쇄와 최대-최소 촉구가 발달장애 아동의 일상생활 기술 수행에 미치는 효과를 살펴보았다. 연구 참여자는 특수학교 중학과정 2학년 아동 2명이다. 종속변인은 아동이 아침에 등교한 뒤 자신의 가방과 신발, 겉옷을 정리하는 일상생활 기술로 설정하였으며 독립변인으로 후진형 행동연쇄와 최대-최소 촉구를 중재로 제공하였다. 관찰 및 측정은 일상생활 기술을 아동에 따라 개별적인 6-10단계로 과제분석한 뒤 수행률의 변화를 살펴보았으며 이때 수행률은 아동이 수행한 과제분석 단계의 수를 전체 과제분석 단계의 수로 나누어서 백분율로 산출하였다. 실험설계는 행동간 중다간헐설계 방법을 사용하여 기초선 단계, 중재 단계, 유지 단계의 자료를 수집하였으며 기능적 관계가 입증되었다. 시각적 분석 결과, 후진형 행동연쇄와 최대-최소 촉구는 발달장애를 가진 아동의 일상생활 기술을 개선하는 데 효과가 있고 중재 효과는 일정 시간이 지난 후에도 유지되었다. 연구 전반에 관한 논의와 제한점, 제언을 서술하였다. The purpose of this study was to investigate the effects of backward chaining and most-to-least prompting on the performance of daily living skills of children with developmental disabilities. Two second-grade students from the special middle school participated in this study. Daily living skills, organizing one s bag, shoes, and jacket when the students arrive at the school in the morning, was selected as the dependent variable. The backward chaining and the most-to-least prompting provided as interventions were selected as the independent variables. For observation and measurement, the change in the performance rate was examined after analyzing daily living skills in individual 6-10 steps for each child. In this case, the performance rate was calculated as a percentage by dividing the number of task analysis steps performed by the child by the total number of task analysis steps. Using a multiple probe baseline design across behavior, the data of baseline, intervention, and maintenance phase were collected and functional relation was verified. The result of visual analysis revealed that the daily living skills of children with developmental disabilities have improved effectively by the backward chaining and the most-to-least prompting, and these intervention effects were maintained even after a period of time. Discussions, limitations, and suggestions regarding the overall study were described.

기능기반의 중재 패키지가 뇌병변장애 아동의 순응행동에 미치는 효과

강영모(Kang, Youngmo),양문봉(Yang, Moonbong) 한국행동분석학회 2020 행동분석․지원연구 Vol.7 No.2

본 연구는 뇌병변장애 아동에게 기능기반의 중재 패키지(function-based intervention package)를 실시한 다음 순응행동(compliance)의 변화와 유지 여부를 살펴보았다. 선행연구에서 효과가 입증된 상반행동 차별강화(Differential Reinforcement of Incompatible behavior: DRI)를 적용하면서 불순응행동에 대해서는 행동의 기능을 고려하여 회피소거를 추가로 접목하였고, 순응행동에 대해서는 자극선호도평가 및 경쟁자극평가 결과를 바탕으로 개별화된 강화제를 제공하였다. 이러한 기능기반의 중재 패키지를 독립변인으로, 걷기 지시에 대한 순응행동을 종속변인으로 설정했으며, 특수학교에 재학하고 있는 뇌병변장애 1급 아동을 대상으로 반전설계(reversal design)를 사용하여 실험통제를 입증했다. 시각적 분석으로 도출한 연구 결과, 기능기반의 중재 패키지는 뇌병변장애 아동의 순응행동을 증가시켰으며 실험 이후 중재를 제공하지 않는 조건에서도 중재의 효과가 유지되었다. 또한 특수학교에서 뇌병변장애 아동을 대상으로 기능기반의 중재 패키지를 적용할 때의 제한점을 서술하고 후속연구에 관한 논의를 제시하였다. This study conducted a function-based intervention package to a child with brain lesions, and examined the changes and maintenance of compliance. The Differential Reinforcement of Incompatible of behavior (DRI) was applied, which has been proven to be effective in prior studies. The avoidance extinction were added to the noncompliance after considering the functions of behavior. Based on the Stimulus Preference Assessment (SPA) and Competing Stimulus Assessment (CSA) results, the individualized reinforcer were provided for compliance. In terms of variables, the function-based intervention package was set as independent variables and compliance with walking instructions as subordinate variables. The experimental control was demonstrated using the reversal design to the child with 1st-degree brain lesions currently attending special schools. As a result of the study deriving from visual analysis, the function-based intervention package increased the compliance of the child with brain lesions. It maintained the intervention effect even when no intervention was provided after the experiment ended. The study also showed the limitations in applying function-based intervention package to the child with brain lesions in special school and presented discussions on future studies.

응용행동분석에 기반한 행동계약이 지적장애 학생의 자기관리 기술에 미치는 효과

강영모(Kang, Youngmo),양문봉(Yang, Moonbong) 한국행동분석학회 2021 행동분석․지원연구 Vol.8 No.1

본 연구는 응용행동분석에 기반한 행동계약이 지적장애 학생의 자기관리 기술에 미치는 효과를 살펴보기 위해 초등학교 특수학급 2학년 학생 1명과 특수학교 전공과 1학년 학생 1명을 대상으로 행동계약을 실시하였다. 선행연구를 바탕으로 행동계약에 필요한 공통 구성요소들을 포함하여 행동계약서를 작성하였다. 자기관리 기술은 학생 개인에게 필요한 일상생활 기술 중에서도 날마다 수행할 확률이 높은 규칙적이고 반복적인 일과행동을 선정하였다. 특히 표적행동의 선정에서부터 행동계약서 작성, 행동계약 실시, 행동계약 종료에 이르기까지 전 과정에서 자기관리 역량과 관련 있는 요소를 고려하였다. 학생 A와 학생 B의 실험은 각각 학교와 가정에서 진행하였으며 반전설계를 활용하여 기능적 관계를 입증하였다. 시각적으로 분석한 연구 결과, 응용행동분석에 기반한 행동계약은 지적장애 학생의 자기관리 기술을 증가시키는 데 효과가 있었다. 학교에서 관찰한 중재의 효과는 이후에도 유지되었으며 가정에서 관찰한 중재의 효과는 학교 환경에서도 일반화되었다. 연구 전반에 관한 논의와 제언을 서술하였다. In order to examine the effects of applied behavior analysis-based behavioral contracts have on self-management skills of students with intellectual disabilities, in this study, behavioral contracts were implemented for a total of 2 students, one 2nd grade student in an elementary school special class and one 1st grade student attending post-high school specialized vocational program in special school. Based on previous studies, the behavioral contracts were prepared by including the common components required for the behavioral contracts. As for the self-management skills, regular and repetitive daily behaviors with a high probability to perform everyday were selected among the daily life skills required for individual students. In particular, factors related to self-management competency were considered in the whole process starting from selecting target behavior to writing the behavioral contracts, implementing the behavioral contracts, and ending the behavioral contracts. The experiments of student A and student B were conducted at school and at home, respectively, and functional relation was demonstrated by applying a reversal design. As a result of visual analysis, the applied behavior analysis-based behavioral contracts were effective in increasing the self-management skills of students with intellectual disabilities. The effects of intervention observed in school were maintained afterwards, and the effects of intervention at home were also generalized in the school environment. Discussion and suggestions for the overall study have been described.

PEMFC 금속분리판용 저가형 카본계 표면처리 조건에 대한 연구

김명환(Myong-Hwan Kim),구영모(Youngmo Goo),유승을(Seung-Eul Yoo),이치승(Chi Seung Lee),백석민(Suk Min Baeck),양유창(Yoo Chang Yang) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11

입체음향 기법을 적용한 증강현실 시스템 설계

김동현(Donghyun Kim),정성모(Sungmo Jung),임효영(Hyo young Leem),근소걸(Sogeol Geun),양석(Shuo Yang),임재현(Jaehyun Lim),오영모(Youngmo Oh),김석수(Seoksoo Kim) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.1

Effect of use and type of helmet on occurrence of traumatic brain injuries in motorcycle riders in Korea: a retrospective cohort study

Seo Sowon,Yeom Seok Ran,Park Sung-Wook,Wang Il Jae,Cho Suck Ju,Yang Wook Tae,Cho Youngmo 대한외상학회 2023 大韓外傷學會誌 Vol.36 No.2

Purpose: The purpose of this study was to investigate (1) the association among helmet wearing, incidence rate of traumatic brain injury (TBI), and in-hospital mortality; TBI was diagnosed when the head Abbreviated Injury Scale (AIS) was ≥1, and as severe TBI when head AIS was ≥3; and (2) the association between helmet type and incidence rate of TBI, severe TBI, and in-hospital mortality of motorcycle accidents based on the newly revised Emergency Department-based Injury In-depth Surveillance (EDIIS) data. Methods: Data collected from EDIIS between January 1, 2020 and December 31, 2020 were analyzed. The final study population comprised 1,910 patients, who were divided into two groups: helmet wearing group and unhelmeted group. In addition, the correlation between helmet type and motorcycle accident was determined in 596 patients who knew the exact type of helmet they wore. A total of 710 patients who wore helmet but did not know the type were excluded from this analysis. Multivariate logistic regression was performed in both the groups to investigate the factors affecting the primary (occurrence of TBIs) and secondary outcomes (severe TBI and in-hospital mortality). Results: The prevalence of Injury Severity Scores, TBIs, and severe TBIs as well as in-hospitalmortality were the highest in the unhelmeted group. Additionally, the results from the group that wore and knew the type of helmet worn indicated that wearing a full-face helmet decreased the incidence of TBIs in comparison to a half-face helmet. Conclusions: The wearing of a helmet in motorcycle accidents is very important as it plays a role in reducing the occurrence of TBIs and severe TBIs and in-hospital mortality. The use of a full-face helmet lowered the incidence of TBIs.