MD5와 Crypt를 이용한 안전한 웹 인증 시스템의 설계 및 구현

윤현경(Hyun-Kyoung Yoon),김완경(Wan-Kyung Kim),소우영(Woo-Young Soh) 한국멀티미디어학회 2004 한국멀티미디어학회 학술발표논문집 Vol.2004 No.1

Input talks: a case study of one experienced preschool teacher’s use of English input

Lee, Su Jin(이수진),Yoon, Hyun Kyung(윤현경) 학습자중심교과교육학회 2018 학습자중심교과교육연구 Vol.18 No.16

제 2언어 습득에 있어 언어입력은 필수요소이다. 언어입력 없이는 어떠한 학습자도 언어습득이 불가능하며, 고급 화자일수록 경험된 언어입력의 양은 상당하다. 이러한 관점에서, 언어입력의 중요성과 상호작용을 언어입력의 한 요소로 보는 다양한 연구들이 활발하게 진행되어 왔다. 하지만, 기존의 연구들은 주로 이론적 이해 증진에 그치고 있어, 구체적인 교수방법에 대한 분석과 제언이 필요한 상황이다. 이에, 본 연구는 한 영어유치원 교사의 사례를 통해 어떠한 교수전략으로 언어입력을 제공하고 또 수정된 상호작용을 도모하여 영어 습득 환경을 조성하고 있는지를 알아보았다. 참여한 교사가 맡은 그룹의 유아들은 만 3세로 이전에 영어에 대한 노출이 거의 없었다. 교사는 유아들의 연령에 따른 발달 특성 및 언어 수준을 고려하여, 다음 다섯 가지 전략을 통해 효과적인 영어 교육 환경을 조성 하였다: 1) 노래와 게임을 통한 목표어의 반복; 2) 리듬과 운율을 활용한 청각자료 이용; 3)몸짓 및 동작과 같은 비언어적 의사소통 구현; 4) 사진이나 그림을 통한 시각자료 도입; 5) 의사소통 촉진을 위한 수정된 상호작용 도모. 언급된 다섯 가지 교수전략 도입 한 달 후, 유아들은 목표어를 이해하고 사용하는 데 어려움이 없었으며 영어 사용에 대한 자신감도 높아졌다. 또한 제 2언어 입력에 있어 단순히 듣기 및 읽기 자료를 제공하는 것 보다 수정된 상호작용을 병행하였을 때 성공적인 언어습득 및 말하기로 확장될 수 있음이 본 연구에서 나타났다. No learner can create a second language structure without some sort of input, and advanced learners experience a considerable amount of input throughout their learning process (VanPatten, 2002). Emphasizing the essential role of input, child language researchers have examined the roles of input (e.g., Bavin, 2009; Krashen, 1985) and language interactions as an input source (e.g., Cote, 2001; Gass, 1997; Quiroz, Snow, & Zhao, 2010). Although these previous research studies made positive contributions to understanding input, it remains quite challenging to put those theories into practice. Consequently, the major goal of this study is to evaluate teaching strategies for child language teachers to facilitate their pupils’ input processing. The study investigates the following research questions: 1) What types of teaching strategies can a child language teacher use to facilitate pupils’ input in the first month of their English learning? 2) What linguistic and motivational evidence can we discover after the input gets processed? We approach this as a case study by examining descriptive data such as interviews, learner progress reports, and teaching artifacts from one English preschool teacher. The duration of this study was from February to May 2018. The data analysis focused on the teacher’s facilitation strategies and children’s linguistic development. The findings showed: 1) The optimal conditions for input processing for three-year-old language learners include the teacher’s use of authentic picture books, songs, games, and modified interactions; and 2) Young learners’ linguistic output is apparent evidence of processed input. In conclusion, these results suggest that, for teaching English to young children, input sources are best used with modified interactions.

일부 전문대학 보건계열 대학생의 취업 스트레스와 구강 증상발현에 관한 연구

황다혜 ( Da Hey Hwang ),윤현경 ( Hyun Kyung Yun ),황태윤 ( Tae Yoon Hwang ) 한국치위생학회(구 한국치위생교육학회) 2014 한국치위생학회지 Vol.14 No.4

Objectives : The purpose of the study is to investigate the relationship between employment stress and oral symptoms in health college students. Methods : A self-reported questionnaire was filled out by 275 health college students in Seoul from October 7 to November 29, 2013. The data were analyzed using SPSS WIN 14.0 program. Results : Female students tended to have higher employment stress oral symptoms than male. The higher the employment stress was, the more oral symptoms were. There was a close relationship between personal trait, environmental stress and oral symptoms. Regression analysis showed that tongue, teeth, gum, temporomandibular joint(TMJ) were influenced by the employment stress. Conclusions : It is important to reduce the environmental stress in the students. The students themselves must try to overcome the agonal condition by diverting stress into positive way of living.

치열교정환자의 투명 교정장치에 대한 지식 및 자가관리행태

황다혜 ( Da Hey Hwang ),윤현경 ( Hyun Kyung Yun ),황태윤 ( Tae Yoon Hwang ) 한국치위생학회(구 한국치위생교육학회) 2014 한국치위생학회지 Vol.14 No.4

Objectives : The purpose of the study is to investigate the knowledge and self care behaviors of orthodontic patients using clear aligner. Methods : A total of 181 orthodontic patients using clear aligner in Daegu filled out the self-reported questionnaire from September 6 to October 18, 2010. and 162 subjects completed orthodontic treatment. Results : There existed a significant difference in knowledge and self care behaviors between gender and wearing duration of clear aligner(p<0.01). Treatment duration influenced significantly on the score of self care behaviors(p<0.01) and the high score of self care behavior showed in short duration of treatment. Conclusions : Self care behaviors were closely correlated with treatment duration. An information for the clear aligner will be helpful to improve the knowledge and self care behaviors.

소나무림내 천연갱신 유형에 따른 나무좀류 초기군집 변화

김다솜 ( Da-som Kim ),박상욱 ( Sang Wook Park ),노승진 ( Seung Jin Roh ),유태희 ( Tae-hee Yoo ),윤현경 ( Hyun-kyung Yoon ),김현섭 ( Hyun-seop Kim ),변봉규 ( Bong-kyu Byun ) 한국환경생태학회 2016 한국환경생태학회 학술대회지 Vol.2016 No.2

This study was carried out to investigate the initial change of Scolytinae community in gree-tree retention from 2013 to 2015 in pine tree forest from Korea. Five types of retention methods were set up to investigate of insect community at Keungjeogol, Samcheok, Gangwon-do. Lindgren funnel traps were installed to collect insects during July to August from 2013 to 2015. A total of 690 individuals of 20 species was collected and population of insects were gradually increased every year in this study. The results of insect community analysis, show that most survey sites higher than the control area annually. This study will contributes as basic information for long-term study of initial changes of insect community in green-tree retention forest.

불화규산의 mutans streptococci에 대한 항균작용 및 인체돌연변이 유발가능성에 관한 연구

박은아,박근영,박병래,김유영,윤현경,최기운,이진용 대한구강보건학회 2001 大韓口腔保健學會誌 Vol.25 No.4

Antibacterial effect of F^- at lower concentrations present in fluoridated water and local application of F^- on cariogenic bacteria is controversial. The present study was performed to examine antibacterial effect of fluorosilicic acid at various concentrations and long-term effect of the fluoride at lower concentrations on representative strains of mutans streptococci: S. mutans NCTC 10449 and S. sobrinus 6715. For the purpose, physico-chemical characteristics of the bacteria treated with fluorosilicic acid were observed. Minimum inhibitory concentration (MIC) of F^- for S. mutans and S. sobrinus was determined to be 50 and 100 ppm, respectively, as measured by optical density. The addition of F^- at MIC to mutans streptococci in the exponential phase decreased the cell viability by more than 80%. F^- in combination with xylitol and polyphosphate slightly enhanced their antibacterial activity. The experimental strains exposed to F^- (0∼15 ppm) for 2 years on blood agar plates containing fourosilicic acid demonstrated to obtain resistance to some extent to F^-. F^- exposure decreased the inhibition of the bacterial growth by F^- as observed after the incubation with F^- at the range of MIC, the concentration determined 2 years ago. The decrease in the inhibition of growth and survival by F^- was more prominent with the strains long-term exposed to higher concentrations of F^-. The pH of the F^- -exposed strains when cultured in broth containing fluorosilicic acid was significantly lower than that of the strains which had not been exposed to F^-. Difference in pH between 4- and 24-h incubation was more prominent with the strains long-term exposed to F^-, suggest that F^- exposure conferred F^- resistance to the mutans streptococci. The higher concentrations of F^- the strains exposed to, the higher synthesis of soluble glucan was measured in S. mutans, resulting in higher binding of the bacterium to glass surface. However, those were decreased in S. sobrinus long-term exposed to higher concentrations of F^-. Regardless whether the bacteria were exposed to F^- or not, no significant difference in binding to saliva-coated hydroxyapatite and protein profiles. Transmission electron micrographs revealed that loss of the cell wall and vacuolization in the cytoplasm were distinct in the bacteria exposed to higher concentrations of F^-. It was shown in Ames test that F^- up to 100 ppm appeared to be negative for mutagenicity. Overall, the results suggest that combination of fluorosilicic acid with other anticariogenic reagents may be benefical for a better caries prevention. Use of fluoride for long-term period of time even at lower concentrations may contribute to the efficacy of fluoride in caries prevention, inhibiting the bacterial function and metabolism.