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전기방사한 PVDF 기반의 강수 센서 제작 및 강수형태에 따른 압전특성에 관한 연구
김슬비,이세영,김한성,Kim, Seul Bi,Lee, Se Young,Kim, Han Seong 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.2
Polyvinylidene fluoride (PVDF) is a popular piezoelectric polymer because of its mechanical properties, high flexibility, thermal stability, chemical resistance, and relatively low cost. These features make PVDF attractive for applications such as electromechanical actuators and energy harvesters, in which physically flexible devices perform energy conversion. This study used PVDF as the sensor element in a piezoelectric rain sensor that was manufactured from electrospun PVDF nanoweb. The reactivity of the rain sensor was investigated by using high speed photography to study the correlation between the sensor angle and raindrop height, raindrop frequency and raindrop weight. The piezoelectric voltage signals produced were found to vary as a function of raindrop form.
수학 교과에서의 주목하기(Noticing)에 관한 이해
김슬비,황혜정,Kim, Seul Bi,Hwang, Hye Jeang 영남수학회 2021 East Asian mathematical journal Vol.37 No.4
There have been gradually a few studies on Noticing in the domestic and international area. For the purpose of increasing the concern on teacher noticing and pursuing the affluent studies on the noticing, this study tried to explore and understand the background, the meaning, and the properties of the teacher noticing while summing up the views of the various researchers. As a result, the teacher noticing could be defined as a cognitive process which is focused on mathematical objects, students' mathematical thinking, students' emotions, teaching strategies, classroom environment and interprets them to determine how to react. From this, noticing might be cognitive process which is a combined form of the objects and cognitive behavior, while the objects whom teachers notice covers up the mathematical objects and the teaching objects. Eventually, this study expects to serve as a basis to foster the in-depth understanding of teacher noticing and to derive the follow-up studies.
논문 : Hotelling의 T-square 통계량을 이용한 강우유발 사면붕괴 예측
김슬비 ( Seul Bi Kim ),나종화 ( Jong Hwa Na ),서용석 ( Yong Seok Seo ) 대한지질공학회 2015 지질공학 Vol.25 No.3
본 연구에서는 화강암 풍화토와 편마암 풍화토를 대상으로 모형시험 수행 중 획득한 간극수압, 함수비 데이터를 대상으로 Hotelling의 T2 분석을 실시하여 사면의 이상거동을 감지할 수 있는 기법을 개발하였다. 각 시험에서는 간극수압 3개와 함수비 3개가 동시에 측정되며, 이들의 상관관계를 이용하여 신뢰구간 95.0%와 90.0%를 기준으로 T2 통계량을 계산하였다. 분석결과에 의하면 모형사면 내의 국부적인 붕괴는 센서 위치에 따라 감지하지 못하는 경우가 있으며, 사면 전체붕괴의 경우 수백 초에서 수천 초 전에 T2 통계량이 신뢰구간 90%를 초과하여 이상거동을 감지할 수 있었다. Hotelling의 T2 분석은 동일 사면 내 다양한 측정치 간의 상관성을 분석할 수 있어 유일한 관리기준치를 설정할 수 있으며, 신뢰도 수준에 따라 단계적인 예경보 기준설정이 가능하다. A new technique is presented to detect unstable slope behavior, based on Hotelling’s T2 analysis of pore pressure and water content obtained during flume tests using granitic and gneissic weathered soils. Three sets of pore pressure-water content values were simultaneously obtained during each test, and T2 statistics at the 90.0% and 95.0% confidence levels were calculated based on the correlations between values. The results show that unsuccessful detection of some local failures of the flume slope depended on the sensor position. In the case of global slope failures, anomalous behavior was detected between several hundred and several thousand seconds before the event as T2 statistics exceeded the confidence interval 90%. Hotelling’s T2 analysis provides a single control criterion because it enables correlations between diverse measured values within the same slope; the criterion also includes stepwise criteria for a forecasting and warning system based on confidence levels.
김슬비 ( Seul Bi Kim ),황혜정 ( Hye Jeang Hwang ) 한국수학교육학회 2015 수학교육논문집 Vol.29 No.3
본 연구에서는 ‘동일한’ 문제 조건으로부터 생성과 재구성을 모두 경험할 수 있는 문제제기 활동을 적용하되, 활동을 세분화하여 학생들의 자주적인 활동을 강조한 활동과 학생들의 보편적 사고를 유도하며 교사 안내가 수반되는 활동으로 구분하여 이에 대한 두 절차를 구안하고, 이 두 활동에 의거하여 문제생성과 재구성 활동에 관해 탐색하고자한다. 이를 위하여, 본 연구에서는 예비교사들을 대상으로 연구자가 구안한 문제제기 활동을 적용한 실험 수업 후 설문조사를 통하여 문제생성과 재구성에 대한 난이도 및 흥미도, 인지적·정의적 측면에서의 효과, 그리고 수학 수업 및 평가에서의 활용성 등을 탐색하였다. 그 결과, 문제생성은 창의력을 증진시키고 수학에 대한 흥미를 유발하며, 문제재구성은 문제 해결력 향상에 도움이 되고 자신감을 길러주는 것으로 나타났다. 또한 수업 상황에서는 문제생성 활동이 더 효과적이고, 평가 상황에서는 문제재구성 활동이 더 효과적인 것으로 나타났으나 각 상황에서 문제생성과 재구성에 대한 응답의 차이가 크지 않았으므로 두 활동 모두 수업 및 평가에 적용이 가능할 것으로 판단된다. 따라서 교사는 학습자의 수준, 가르칠 영역, 진도 등을 고려하여 수업 및 평가 상황에서 문제생성과 재구성 활동을 적절한 시기에 알맞게 적용함으로써 학습자의 인지적, 정의적 성취의 함양을 돕도록 해야 할 것이다. Problem posing in school mathematics is generally regarded to make a new problem from contexts, information, and experiences relevant to realistic or mathematical situations. Also, it is to reconstruct a similar or more complicated new problem based on an original problem. The former is called as problem generation and the latter is as problem reformulation. The purpose of this study was to explore the co-relation between problem generation and problem reformulation, and the educational effectiveness of each problem posing. For this purpose, on the subject of 33 pre-service secondary school teachers, this study developed two types of problem posing activities. The one was executed as the procedures of [problem generation→solving a self-generated problem→reformulation of the problem], and the other was done as the procedures of [problem generation→solving the most often generated problem→reformulation of the problem]. The intent of the former activity was to lead students’ maintaining the ability to deal with the problem generation and reformulation for themselves. Furthermore, through the latter one, they were led to have peers’ thinking patterns and typical tendency on problem generation and reformulation according to the instructor(the researcher)``s guidance. After these activities, the subject(33 pre-service teachers) was responded in the survey. The information on the survey is consisted of mathematical difficulties and interests, cognitive and affective domains, merits and demerits, and application to the instruction and assessment situations in math class. According to the results of this study, problem generation would be geared to understand mathematical concepts and also problem reformulation would enhance problem solving ability. And it is shown that accomplishing the second activity of problem posing be more efficient than doing the first activity in math class.
전극 일체형 polyvinylidene difluoride(PVDF) 압전 섬유에 관한 연구
이세영,김슬비,최세진,방주엽,김한성,Lee, Se Young,Kim, Seul Bi,Choi, Se Jin,Bang, Ju Yup,Kim, Han Seong 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.4
Polyvinylidene difluoride solution dip-coating and a high-voltage poling process is effective at inducing chain reorientation and phase transformation. Moreover, a copper wire external electrode and coated fiber combined to form a piezoelectric device successfully. In addition, a textile-like piezoelectric device comprising of three warps and one weft was fabricated, and the piezoelectric properties of the device were evaluated. The voltage from the polyvinylidene difluoride fiber was increased as the external force was applied. The piezoelectric performance was affected by the presence of external load resistors. Moreover, in the case of the textile-type piezoelectric device, the more warps and weft were connected to each other, the higher was the voltage generated. Consequently, single fiber can be used for piezoelectric devices, moreover, it enables advanced users to have wide application, for example, woven or knitted smart textile-type sensors or micro energy harvesters.