개방형 문제해결학습이 초등학생들의 수학적 창의성 및 수학적 태도에 미치는 영향

서영민 ( Seo¸ Youngmin ),박만구 ( Park¸ Mangoo ) 한국수학교육학회 2021 수학교육논문집 Vol.35 No.3

본 연구는 초등학생을 대상으로 개방형 문제해결학습을 진행하였을 때 학생들의 수학적 창의성과 수학적 태도에 대해 어떤 영향을 미치는지 알아보기 위한 것이다. 이를 위해 서울 시내 초등학교 6학년 학생들을 대상으로 9차시의 개방형 문제해결학습을 진행한 뒤 I-STATistics를 활용하여 사전 사후 t-검정하여 결과를 분석하였다. 연구 결과, 개방형 문제해결학습은 수학적 창의성 신장에 효과가 있었고, 특히 창의성의 하위 요소인 유창성에는 유의미한 결과가 없었지만, 융통성, 독창성 신장에 효과가 있었다. 또한, 개방형 문제해결학습은 수학적 태도 향상에 도움이 되며 특히 하위 요인 중 수학적 태도, 인정욕구, 동기 향상에 효과가 있었다. 그리고 개방형 문제해결학습에서 학생들은 다양한 반응을 공유하고 생각을 확장할 수 있었다. 연구 결과를 토대로 학교 현장에서 개방형 수학 문제해결을 활용을 위한 양질의 자료 개발 및 교사 연수를 지속할 필요가 있음을 제안하였다. The purpose of this study was to find out how problem solving learning with open-ended mathematics problems for elementary school students affects their mathematical creativity and mathematical attitudes. To this end, 9 problem solving lessons with open-ended mathematics problems were conducted for 6th grade elementary school students in Seoul, The results were analyzed by using I-STATistics program to pre-and post- t-test. As a result of the study, problem solving learning with open-ended problems was effective in increasing mathematical creativity, especially in increasing flexibility and originality, which are sub-elements of creativity. In addition, problem solving learning with open-ended problems has helped improve mathematical attitudes and has been particularly effective in improving recognition needs and motivation among subfactors. In problem solving learning with open-ended problems, students were able to share various responses and expand their thoughts. Based on the results of the study, the researchers proposed that it is necessary to continue the development of quality materials and teacher training to utilize mathematical problem solving with open-ended problems at school sites.

Multi-institutional Comparison of Intensity Modulated Radiation Therapy (IMRT) Planning Strategies and Planning Results for Nasopharyngeal Cancer

Park, Sung Ho,Park, Hee Chul,Park, Suk Won,Oh, Do Hoon,Choi, Youngmin,Kim, Jeung Kee,Ahn, Yong Chan,Park, Won,Suh, Hyun Sook,Lee, Rena,Bae, Hoonsik The Korean Academy of Medical Sciences 2009 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.24 No.2

<P>The intensity-modulated radiation therapy (IMRT) planning strategies for nasopharyngeal cancer among Korean radiation oncology facilities were investigated. Five institutions with IMRT planning capacity using the same planning system were invited to participate in this study. The institutions were requested to produce the best plan possible for 2 cases that would deliver 70 Gy to the planning target volume of gross tumor (PTV1), 59.4 Gy to the PTV2, and 51.5 Gy to the PTV3 in which elective irradiation was required. The advised fractionation number was 33. The planning parameters, resultant dose distributions, and biological indices were compared. We found 2-3-fold variations in the volume of treatment targets. Similar degree of variation was found in the delineation of normal tissue. The physician-related factors in IMRT planning had more influence on the plan quality. The inhomogeneity index of PTV dose ranged from 4 to 49% in Case 1, and from 5 to 46% in Case 2. Variation in tumor control probabilities for the primary lesion and involved LNs was less marked. Normal tissue complication probabilities for parotid glands and skin showed marked variation. Results from this study suggest that greater efforts in providing training and continuing education in terms of IMRT planning parameters usually set by physician are necessary for the successful implementation of IMRT.</P>

평행사변형의 내접 타원에 대한 연구

박경수(Park, Gyeongsu),박정현(Park, Jeonghyeon),조영민(Cho, Youngmin) 한국과학영재교육학회 2021 과학영재교육 Vol.13 No.1

본 연구는 한국과학창의재단 과학영재 창의연구(R&E)에서 수행한 연구 결과를 바탕으로 이루어졌다. 박정현, 박경수, 조영민(2020)의 연구를 통해 삼각형 내부의 모든 점이 삼각형의 내접 타원의 초점이 될 수 있음을 알게 되었다. 그렇다면 평행사변형의 내접 타원의 초점은 어떤 점이 될 수 있을까?라는 의문점을 갖게 되었다. 본 연구에서는 박정현 외(2020)의 연구 방법을 확장하여 탐구를 진행하였다. 즉, 평행사변형의 각 변이 내접 타원의 접선이라는 아이디어를 적용하여 탐구를 진행하였다. 본 연구를 통해 다음과 같은 연구 결과를 얻을 수 있었다. 첫 번째, 평행사변형의 내접 타원의 초점이 될 수 있는 필요충분조건을 찾을 수 있었다. Geogebra 프로그램에서 타원에 외접하는 다양한 평행사변형을 그리고, 이들의 공통점을 찾음으로써 평행사변형의 내접 타원의 초점이 될 필요충분조건을 찾을 수 있었다. 두 번째, 네 변의 길이가 모두 같은 평행사변형인 마름모의 내접 타원의 초점이 될 수 있는 점은 마름모의 두 대각선을 이룸을 알 수 있었다. 이를 통해 정사각형 또한 내접 타원의 초점이 될 수 있는 점은 두 대각선 위에 있음을 알 수 있으며, 정사각형과 마름모의 내접 타원은 무수히 많이 존재함을 알 수 있었다. 세 번째, 마름모가 아닌 평행사변형의 내접 타원의 초점이 될 수 있는 점은 쌍곡선을 이룸을 알 수 있었다. 평행사변형의 각 중 90도 보다 크지 않은 각을 a라 하고, 평행사변형의 두 대각선의 교점을 원점이라 할 때, 내접 타원의 초점이 될 수 있는 점들은 표준형에서 원점을 중심으로 (45-a/2)도 만큼 회전한 쌍곡선을 이룸을 발견하였다. 이를 통해 마름모가 아닌 직사각형 및 평행사변형의 내접 타원 또한 무수히 많이 존재함을 알 수 있었다. 마지막으로 평행사변형의 내접 타원을 그리는 방법을 찾을 수 있었다. 본 연구 과정에서 발견한 평행사변형의 내접 타원의 초점이 이루는 곡선을 이용하여 평행사변형의 내접 타원을 그리는 방법을 찾을 수 있었다. This study was based on the research results conducted as a R&E project for the gifted students with a financial support from the Korea Foundation for the Advancement of Science and Creativity. Through the research of Park, Park, & Cho (2020), it was found that all points inside the triangle can be the focal point of the inscribed ellipse of the triangle. Then, what could be the focus of the inscribed ellipse of the parallelogram? In this study, the research method of Park, et al (2020) was expanded to investigate. In other words, the research was conducted by applying the idea that each side of a parallelogram is a tangent of an inscribed ellipse. Through this study, the following research results were obtained. First, we found the necessity and sufficiency to become the focal point of the inscribed ellipse of the parallelogram. By drawing various parallelograms circumscribed to an ellipse in the Geogebra program and finding their common points, we found find the necessity and sufficiency to be the focal point of the inscribed ellipse of the parallelogram. Second, we found that the point which can be the focal point of the inscribed ellipse of a rhombus forms two diagonal lines of a rhombus. Third, we found that the point that can be the focal point of the inscribed ellipse of a parallelogram, not a rhombus, forms a hyperbolic curve. When the angle of the parallelogram that is not bigger than 90 degrees is called a, and if we choose the origin as a intersection of the two diagonals of the parallelogram, the points that can be the focal points of the inscribed ellipse form a hyperbolic curve rotated clockwise by (45-a/2) degrees in standard form around the origin. Through this, it can be seen that there are countless inscribed ellipses of rectangular and parallelogram shapes, and rhombus. Finally, I was able to find a way to draw an inscribed ellipse of a parallelogram. The method of drawing the inscribed ellipse of the parallelogram was found by using the curve formed by the focal point of the inscribed ellipse of the parallelogram.

Amplified circularly polarized phosphorescence from co-assemblies of platinum( <small>II</small> ) complexes

Park, Gyurim,Kim, Hyungchae,Yang, Hoichang,Park, Kyung Ryoul,Song, Inho,Oh, Joon Hak,Kim, Changsoon,You, Youngmin Royal Society of Chemistry 2019 Chemical Science Vol.10 No.5

<▼1><P>Co-assemblies of platinum(<SMALL>II</SMALL>) complexes produce amplified circularly polarized phosphorescence emission.</P></▼1><▼2><P>Molecules capable of producing zero-field circularly polarized phosphorescence (CPP) are highly valuable for chiroptoelectronic applications that rely on triplet exciton. However, the paucity of tractable molecular design rules for obtaining CPP emission has inhibited full utilization. We report amplification of CPP by the formation of helical co-assemblies consisting of achiral square planar cycloplatinated complexes and small fractions of homochiral cycloplatinated complexes. The latter has a unique Pfeiffer effect during the formation of superhelical co-assemblies, enabling versatile chiroptical control. Large dissymmetry factors in electronic absorption (<I>g</I><SUB>abs</SUB>, 0.020) and phosphorescence emission (<I>g</I><SUB>lum</SUB>, 0.064) are observed from the co-assemblies. These values are two orders of magnitude improved relative to those of individual molecules. In addition, photoluminescence quantum yields (PLQY) also increase by a factor of ten. Our structural, photophysical, and quantum chemical investigations reveal that the chiroptical amplification is attributable to utilization of both the magnetically allowed electronic transition and asymmetric coupling of excitons. The strategy overcomes the trade-off between <I>g</I><SUB>lum</SUB> and PLQY which has frequently been found for previous molecular emitters of circularly polarized luminescence. It is anticipated that our study will provide new insight into the future research for the exploitation of the full potential of CPP.</P></▼2>

Spatial Regulation of ABCG25, an ABA Exporter, Is an Important Component of the Mechanism Controlling Cellular ABA Levels

Park, Youngmin,Xu, Zheng-Yi,Kim, Soo Youn,Lee, Jihyeong,Choi, Bongsoo,Lee, Juhun,Kim, Hyeran,Sim, Hee-Jung,Hwang, Inhwan Americ 2016 The Plant cell Vol.28 No.10

<P>The phytohormone abscisic acid (ABA) plays crucial roles in various physiological processes, including responses to abiotic stresses, in plants. Recently, multiple ABA transporters were identified. The loss-of-function and gain-of-function mutants of these transporters show altered ABA sensitivity and stomata regulation, highlighting the importance of ABA transporters in ABA-mediated processes. However, how the activity of these transporters is regulated remains elusive. Here, we show that spatial regulation of ATP BINDING CASETTE G25 (ABCG25), an ABA exporter, is an important mechanism controlling its activity. ABCG25, as a soluble green fluorescent protein (sGFP) fusion, was subject to posttranslational regulation via clathrin-dependent and adaptor protein complex-2-dependent endocytosis followed by trafficking to the vacuole. The levels of sGFP: ABCG25 at the plasma membrane (PM) were regulated by abiotic stresses and exogenously applied ABA; PM-localized sGFP: ABCG25 decreased under abiotic stress conditions via activation of endocytosis in an ABA-independent manner, but increased upon application of exogenous ABA via activation of recycling from early endosomes in an ABA-dependent manner. Based on these findings, we propose that the spatial regulation of ABCG25 is an important component of the mechanism by which plants fine-tune cellular ABA levels according to cellular and environmental conditions.</P>

Type-D Personality Can Predict Suicidality in Patients with Major Depressive Disorder

YoungMin Park,YoungHoon Ko,MoonSoo Lee,HeonJeong Lee,Leen Kim 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.3

Objective-This study investigated the putative association between type-D personality and suicidality, including the history of suicide attempt and suicidal ideation in patients with major depressive disorder (MDD). Methods-Eighty-six outpatients aged between 18 and 65 years with MDD were recruited for this study from Ilsan Paik Hospital. The cohort was stratified into two subgroups according to the presence of type-D personality and history of suicide attempt (yes vs. no). Depression severity was evaluated using the Hamilton Depression Rating Scale. The type-D Personality Scale-14 (DS-14), the Beck Hopelessness Scale (BHS), the Barratt Impulsiveness Scale (BIS), the Hamilton Anxiety Scale, and the Beck Scale for Suicidal Ideation (BSS) were also applied. Results-The total BSS, BHS, and BIS scores were higher for the group with type-D personality than for the group without this personality (p=0.004, 0.01, and 0.003, respectively). In addition, the total scores for the BSS, BHS, and social inhibition (SI; subscale of DS-14) were higher for the group with a history of suicide attempt than for the group without this history (p=0.0000004, 0.003, and 0.033, respectively). There were positive correlations between the total DS-14 score and the total BSS, BHS, and BIS scores (r=0.413 and p=0.000077, r=0.404 and p=0.00012, and r=0.245 and p=0.024, respectively). Conclusion-Depressed patients with type-D personality are more vulnerable to suicidality than those without type-D personality, even when the MDD severity is identical. In addition, the SI score was higher in patients with a history of suicide attempt than in those without this history.

Hydrogen adsorption performance for large-scale cryogenic molecular sieve bed

Park, Soon Chang,Son, Seok-Kwon,Ahn, Mu-Young,Ying, Alice,Cho, Seungyon,Park, Yi-Hyun,Lee, Youngmin Elsevier 2019 Fusion engineering and design Vol.146 No.2

<P><B>Abstract</B></P> <P>Cryogenic hydrogen adsorption using molecular sieve beds is considered to be one of the main candidate processes for recovery of produced tritium from purge gas in breeding blankets and it has been chosen for separating hydrogen isotopes in Tritium Extraction System (TES) of Korean Helium Cooled Ceramic Reflector (HCCR) Test Blanket System (TBS). Various adsorbents and their performance have been studied for the cryogenic adsorption using small-scale experiments. However, large-scale experiments comparable to TBS-relevant scale are required to have sufficient confidence for component design and performance prediction of Cryogenic Molecular Sieve Bed (CMSB) for the TBS and beyond. To properly evaluate hydrogen adsorption performance of a large size CMSB, a series of experiments have been performed using PGLoop facility which is constructed and operated in the National Fusion Research Institute. The experimental conditions were set to include breeding-blankets-relevant parameters. As such, the effects of swamping ratio, total pressure, and flow rates on the performances of CMSB were studied in the range of hydrogen partial pressures from 100 to 700 Pa. While a slight reduction in hydrogen adsorption performance is observed in comparison to the small isotherm experiments, which can be attributed to scale-up effects, it shows that the experimental results agree reasonably well with existing literature data.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Large-scale hydrogen adsorption experiments were conducted using Cryogenic Molecular Sieve Bed module of PGLoop facility. </LI> <LI> The experimental parameters were chosen considering blanket conditions. </LI> <LI> The size effect was not large, and the experimental results agree reasonably well with existing small-scale data. </LI> <LI> The diffusion of hydrogen gas in the purge gas is the dominating factor in CMSB design. </LI> </UL> </P>

The Physicochemical Characteristics and Antioxidant Properties of Nurungji Fortified with Brown Rice, Barley, and Oat

YoungMin Lee,Dayeun Park,ChaeRin Park,HyeJung Seo,HyoYoung Son,HyunSeo Shin,SooMin Lee,JunMyung Jang,SuJung Jung,IlSook Choi 동아시아식생활학회 2022 동아시아식생활학회 학술발표대회논문집 Vol.2022 No.11

Highly Durable and Stable Sodium Superoxide in Concentrated Electrolytes for Sodium-Oxygen Batteries

Park, Hyeokjun,Kim, Jinsoo,Lee, Myeong Hwan,Park, Sung Kwan,Kim, Do-Hoon,Bae, Youngjoon,Ko, Youngmin,Lee, Byungju,Kang, Kisuk Wiley (John WileySons) 2018 Advanced energy materials Vol.8 No.34

Syntactic Enhancement: Bootstrapping for Second Language Reading

( Youngmin Park ) 서울대학교 인지과학연구소 2017 Journal of Cognitive Science Vol.18 No.4

This paper aimed to identify factors that inhibit effective second language (L2) reading and to suggest technology-enhanced reading designed for providing L2 readers with bootstrapping resources. To this end, this paper also addresses the importance of syntactic and prosodic awareness in L2 reading, drawing on L2 reading theories and a number of empirical studies from a body of research related to L2 development. Syntactic and prosodic awareness contribute to L2 reading development as they are highly associated with fluent and accurate reading abilities. However, it is challenging for L2 learners to acquire syntactic and prosodic knowledge due to limited cognitive capacities related to L2 learning, limited prior linguistic knowledge that is usually gained from oral communication, and linguistic differences between native languages and a target language. Addressing these challenges, this paper reviews a potentially useful technological tool of text presentation technology that may help increase syntactic awareness. Although empirical studies that tested the usefulness of technology-enhanced reading tools produced mixed results, their findings imply a viable alternative way of reading and call for future research to validate it.