Ni-Doped Hibonite 파란색 안료의 합성과 발색기구

김금선,이병하,Kim, Gumsun,Lee, Byung-Ha 한국재료학회 2014 한국재료학회지 Vol.24 No.1

NiO-doped hibonite pigments were synthesized by the solid state method to get stabilized blue color pigment in both oxidation and reduction atmospheres. Optimum substitution condition with NiO for hibonite blue pigment was investigated. Experimental results were comparable to those of previous cobalt-minimization studies performed with other phosphate- or oxide-based cobalt-containing ceramic pigments (having olivine ($Co_2SiO_4$), spinel ($CoAl_2O_4$), or with co-doped willemite ($(Co,Zn)_2SiO_4$) structures). Composition was designed varying the NiO molar ratio increasing with $SnO_2$. The optimum substitution content is 0.93 mole NiO with 0.75mole $SnO_2$. The characteristics of the synthesized pigment were analyzed by XRD, Raman spectroscopy, SEM, and UV-vis. Synthesized pigment was applied to a lime-barium glaze with 10 wt% each and fired at an oxidation atmosphere of $1250^{\circ}C/1h$ and a reducing atmosphere $1240^{\circ}C/1h$. Blue color was obtained with $L^*a^*b^*$ values at 43.39, -6.78, -18.20 under a reducing atmosphere and 41.66, -6.36, -14.7 under and oxidation atmosphere, respectively.

V₂O₅가 고용된 Karrooite계의 Brown색 안료합성과 특성

김금선,이병하,Kim, Gum-Sun,Lee, Byung-Ha 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.4

[ $V_2O_5$ ]doped Karrooite pigments were synthesized by the solid state method to get stabilized brown pigment in oxidation and reduction atmosphere. Optimum substitution condition and limited dopant with $V_2O_5$ for Karrooite pigment was investigated. With calcination at $1250^{\circ}C{\sim}1400^{\circ}C$, compositions were designed varying $V_2O_5$ molar ratio by increasing 0.02mole to the formula $Mg_1-xTi_2-xM_{2x}O_5$(x = 0.01~0.09 mole). Synthesized pigments were analyzed by XRD, Raman spectroscopy and UV-vis. When $V_2O_5$ was doped from 0.01 to 0.05 mole, single phase of Karrooite was observed at temperature $1300^{\circ}C$ and soaking time 4h by Raman spectroscopy. However, it was found that excess $VO_2$ peak appeared with 0.07 and 0.09 mole of $V_2O_5$ doped to $MgTi_2O_5$. This result indicated that the maximum limit of solid solution is 0.05 mole $V_2O_5$. Karrooite pigments were applied as a ceramic pigment to achieve brown colors in lime magnesia glaze and lime barium graze at both of oxidation and reduction atmosphere. CIE color coordinates are $L^*$ = 40.34, $a^*$ = 9.94, $b^*$ = 21.40 in lime magnesia glaze.

Diopside 금색 결정 유약의 발색 기구

김금선,임성호,이병하,Kim, Gumsun,Lim, Seong-Ho,Lee, Byung-Ha 한국재료학회 2013 한국재료학회지 Vol.23 No.5

Generally, the color gold has had a biased conception due to its traditional use. Thus, this bias has resulted in a lack of usage of golden glaze on ceramics and also a lack of extensive studies of such glazes. In this paper, optimum conditions and mechanism of formation of gold color crystallization glaze containing $Fe_2O_3$(hematite), which is developed for gold colors of ceramic glazes, were studied. Experimental result showed that there are pyroxene based on diopside and $TiO_2$ phase in the base of a crystallization glaze with a value of $TiO_2$ of 6 wt% confirmed by XRD and Raman Spectroscopy. When $Fe_2O_3$ was used as a colorant for the gold color, the $TiO_2$ peak became extinct and the intensity of the diopside peak was sharper. Feldspar of 60 wt%, talc of 20 wt% and limestone of 20 wt% were used as the starting materials and these were tested using a three component system. The best result of test was selected and extended to its vicinity as an experiment to determine $TiO_2$ and $Fe_2O_3$ contents. The glaze with $TiO_2$ of 6 wt% and $Fe_2O_3$ of 12 wt% addition showed stable pyroxene based diopside crystals and the development of gold color. This gold color was obtained with CIE-$L^*a^*b^*$ values of 51.27, 4.46, 16.15 (a grayish yellow brown color), which was gained using the following firing conditions: temperature increasing speed $5^{\circ}C$/min, holding for 1 h at $1280^{\circ}C$, annealing speed $3^{\circ}C$/min till $1100{\circ}C$, holding for 2 h at $1100{\circ}C$, and finally natural annealing.

중학생 듣기·말하기 학습을 위한 영어자율학습센터의 설계 및 적용

김금선(Kim, Keumsun),김태은(Kim, Tae-Eun),김혜영(Kim, Heyoung),차경환(Cha, Kyung-Whan) 한국응용언어학회 2011 응용 언어학 Vol.27 No.2

The purpose of this study is to suggest a self-access language learning center (SALLC) that is designed as an extra-curricular program for middle school students to enhance their listening and speaking ability and also their language learning autonomy. The researchers designed a five-stage SALLC curriculum, implemented it into an one-month summer course in a middle school and analyzed its effectiveness in terms of students’ participation, autonomy training, and listening and speaking skill development. From the analysis of data from various resources, such as pre- and post-surveys, self-directed language learning readiness tests, and students’ worksheets, Most of the participants showed positive signs, for example, high attendance rate, significant increase of self-directed language learning readiness, and self-perceived improvement of their listening and speaking ability. In conclusion, the idea of SALLC can effectively fit in the Korean middle school context, which can be one alternative to solve the widely noted problems, lack of speaking practice and teacher-centered learning, in English education in Korea.

탈순화와 재순화 반복에 따른 복숭아의 내한성, 탄수화물 함량 및 유전자 발현 변화

김금선(Keum-Sun Kim),신현석(Hyunsuk Shin),김민아(Min-Ah Kim),김대일(Daeil Kim) 한국원예학회 2012 한국원예학회 학술발표요지 Vol.2012 No.10

복숭아 내한성에 따른 Dehydrin 함량 및 유전자 발현

김금선 ( Keum Sun Kim ),신현석 ( Hyun Suk Shin ),오영재 ( Young Jae Oh ),오성일 ( Sung-il Oh ),김민아 ( Min-ah Kim ),이석호 ( Seok-ho Lee ),김임수 ( Im Soo Kim ),김대일 ( Dae Il Kim ) 한국국제농업개발학회 2015 韓國國際農業開發學會誌 Vol.27 No.5

복숭아 네 품종 ‘오도로끼’, ‘가납암백도’, ‘진미’, ‘장호원황도’ 신초의 저온순화 및 탈순화 동안 시기별 내한성 변화는 전해질 누출률을 분석하여 나타냈다. 또한 내한성 결정 요인을 분석하고자 SDS-PAGE를 이용하여 dehydrin 함량 변화를 확인하였으며, 그와 관련된 유전자 발현 분석은 quantitativereal-time RT-PCR을 이용하여 수행하였다. 네 품종의 내한성은 2012년 12월까지 꾸준히 증가하였으며 그 후 2013년 4월까지 감소하였다. PpDhn1 유전자가 인코딩하는 60kDa의 dehydrin 단백질은 탈순화기(2013년 3-4월)에 비하여 저온순화기(2012년11월-2013년 1월) 동안 높은 축적이 확인되었다. PpDhn1 유전자와 PpDhn3 유전자 발현양상은 복숭아 네 품종에서 내한성 변화와 평행하게 나타난 반면, PpDhn2 유전자는 뚜렷한 시기별 패턴을 나타내지 않았다. Differences in cold hardiness were performed by relative electrolyte leakage (REL) analysis in the shoot of the four peach cultivars (P. persica cvs. Odoroki, Kanoiwa Hakuto, Jinmi and Janghowon Hwangdo), including Korean bred cultivars during cold acclimation and deacclimation. In addition, changes of dehydrin proteins of each cultivar were analyzed using a SDS-PAGE protein profiles and expressions of gene related dehydrin were determined using a quantitative real-time RT-PCR. Cold hardiness in four cultivars increased steadily in December 2012, and then decreased to April 2013. Our result indicated that a 60 kDa of dehydrin protein encoded by PpDhn1 gene during cold acclimation (from November 2012 to January 2013) accumulated to higher degrees compared with deacclimation (from March 2013 to April 2013) in all cultivars. Expression pattern of PpDhn1 and PpDhn3 of four cultivars paralleled fluctuations in cold hardiness, whereas expression of PpDhn2 did not indicate any specific pattern.

GBS-SNP와 SSR을 이용한 배 ‘만풍배’와 ‘대원홍’ 종간 교배 집단의 고밀도 유전자 연관 지도 작성

김금선(Keumsun Kim),김윤경(Yoon-Kyeong Kim),원경호(Kyungho Won),신일섭(Il Sheob Shin),강삼석(Sam-Seog Kang),김대일(Daeil Kim),김정선(Jung Sun Kim),정해원(Haewon Jung) 한국육종학회 2022 한국육종학회지 Vol.54 No.4

Pear (Pyrus spp.) is an economically important fruit tree that grows extensively worldwide. To facilitate the identification of agronomically important traits and provide new information for genetic and genomic research concerning this fruit tree, a high-density genetic linkage map of pear was constructed using 178 F1 populations derived from a cross between ‘Manpungbae’ and ‘Oharabeni’. Single nucleotide polymorphisms (SNPs) detected by genotyping-by-sequencing (GBS) and simple sequence repeats (SSRs) developed from pears were analyzed to construct a genetic linkage map. SSR markers were used to locate the corresponding chromosome number for each linkage group (LG). A total of 1,807 GBS-SNPs and 41 SSRs were anchored to the integrated genetic linkage map. Seventeen LGs were identified, covering a genetic distance of 1,519.4 cM with an average marker density of 0.87 cM. The lengths of the LGs ranged from 70.9 cM (LG 14) to 160.4 cM (LG 15). Each LG had SSR markers f rom 1 to 5 , except f or LGs 7 , 8, a nd 9 . Our integrated g enetic map o f pear c ould b e used a s a b asic f rame map for comparative analysis of genomic structure between different pear research groups.

Genome-wide Association Study for Fruit Quality Traits Using GBS-SNPs in Pear Germplasms (Pyrus spp.)

Keumsun Kim(김금선),Sewon Oh,Hyeondae Han,Yoon-Kyeong Kim,Hae Won Jeong,Daeil Kim 한국원예학회 2019 한국원예학회 학술발표요지 Vol.2019 No.10

초등영어학습자의 자기주도학습 과정과 저해요인 연구

김금선(Kim, Keumsun),김혜영(Kim, Heyoung) 한국외국어교육학회 2011 Foreign languages education Vol.18 No.1

This study aims to explore factors influencing two young English learners’ self-directed learning (SDL). The participants of this study are two fifth graders who enrolled in the SDL program. Influenced by the previous models (Fisher, McKeand & Hafner, 2008; McCarthy, 2009), the program was designed to enhance English learners’ autonomy. It consists of three stages: awareness raising, learner training and individual learning. The participants were encouraged to take part in all the stages. Four different methods for data collection were used: questionnaire, documents, observation with field notes and counseling. As a result, two distinguishing variables related to English learning culture of Korea were identified: negative effects of private institutions and mother dependency. Based on this study, it is suggested that teachers and educators in this area should take into account the sociocultural constraints to meet local needs when planning a self-directed learning program. Also, more research has to be done to set up a self-directed learning model for Korean young English learners as well.

스토리텔링 기반 영어 말하기 진단과 카운슬링: 현장 활용 방안 탐구

김금선 ( Keumsun Kim ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.2

본 연구는 외국어 학습에 있어 스토리텔링의 중요성을 주목하고, 스토리텔링 능력을 진단하고 카운슬링하는 콘텐츠를 탐색하고, 어린이 영어교육 현장에 활용할 수 있는 방안을 제안하고자 한다. 이를 위하여 Miller & Chapman(2004)의 NSS(narrative scoring scheme) 진단도구를 소개하였다. NSS는 스토리 문법 구성요소와 응집력 하위의 7가지 평가 요소로 이루어져 있으며, 각각 5점 스케일로 평가된다. 2019년 본 연구에 참여 한 8살 초등학습자의 스토리텔링 샘플을 수집, 전사하였고, NSS 채점 루브릭에 따라 분석하였다. 그 결과, 등장인물과 응집력 요소에 결함이 두드러졌다. 제시된 카운슬링에는 각 영역의 점수 및 설명과 함께 이를 보완하기 위해 필요한 전략과 학습 활동들을 제안하였다. 또한, 어린이 영어교육 현장에 기대할 수 있는 효과 및 새로운 방향성을 제시하였다. The purpose of this study is to examine the diagnostic assessment of storytelling and explore how to employ it to young learners. The study introduces Miller & Chapman (2004)’s Narrative Scoring Scheme. The NSS is a narrative assessment tool that combines seven features of Story Grammar and cohesion. In this study, the oral narrative sample of eight-year-old student was collected, transcribed, and analyzed by the NSS rubric in 2019. Scored using a 0-5 point scale, a total composite score showed individual narrative skills and characteristics. It was found that student A demonstrated characters and cohesion weaknesses. After reporting and interpreting the student’s scores, related strategies and practice were provided to extend the student’s storytelling ability, Several implications for the field of English education were discussed.