기계학습 방법을 이용한 MOOC 학습자의 중도 포기 예측 성능 비교 연구

허윤아 ( Yun-a Hur ),임희석 ( Heui-seok Lim ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2

웹 서비스를 기반으로 이루어진 MOOC(Massive Open Online Course)는 대규모 학습자에게 공개된 온라인 교육이다. MOOC는 교수와 학습자 사이 커뮤니티를 통해 상호 참여적으로 수업을 진행한다. 그러나 무료로 강의를 들을 수 있고 성적을 내지 않기 때문에 학습자들에게 큰 동기 부여가 되지 않아 등록하는 학습자는 많지만 수료하는 학습자는 현저히 적게 나타났다. 본 논문은 이러한 문제 해결 방안 마련을 위해 KDD Cup 2015에서 제공한 MOOC 데이터를 통해 중도 포기와 관련된 변수들을 선정 하였으며,Decision Tree, KNN, Logistic Regression, Naive Bayesian, SVM, Ne니ral Network인 6가지 머신 러닝 알고리즘을 통해 데이터 예측의 정확률을 확인하였다. 그 결과 Naive Bayesian이 89.3%로 가장 높은 정확률을 보였다. 본 연구를 통해 중도포기를 정확히 예측하며, 향후 학습자들에게 특정 동기부여의 효과로 학습을 수료하는 결과를 기대할 수 있다.

불교문화콘텐츠개발과 산업화방안

허윤무(Hur Yun Mou) 한국여행학회 2007 여행학연구 Vol.26 No.-

The study is about the utilization and development of the prototype of Buddhist culture as the creative elements of cultural contents industry by making it as contents. The purpose of this study is to check the way how these subjects could be applied to the real cultural contents industry. Throughout this study, the concept and status of the overall cultural industry have been described to help understand the cultural industry itself and particularly presentation materials have been collected from the people in cultural contents industry for the use later in real cultural industry field. Also, an analysis has been conducted to understand the utilization process of cultural contents industry in worldwide markets. Korean Buddhist culture can be considered as the treasure house of cultural contents resources and a comprehensive art refined over the past 1,700 years. Therefore, for the active development and industrialization of Buddhist culture contents, database should be established and re-processed to create modem contents and continuous long term investment is required.

고령 사용자 맞춤형 UI/UX 제공을 위한 인지 및 온라인 활동 기반 프로파일링

허윤아(YunA Hur),황태선(Taesun Whang),소아람(Aram So),이설화(Seolhwa Lee),임희석(HeuiSeok Lim) 한국컴퓨터교육학회 2018 한국컴퓨터교육학회 학술발표대회논문집 Vol.22 No.2

온라인 학습 활동 데이터의 시각화를 위한 요소 설계

허윤아 ( Yuna Hur ),이동엽 ( Dongyub Lee ),임희석 ( Heuiseok Lim ) 한국컴퓨터교육학회 2017 한국컴퓨터교육학회 학술발표대회논문집 Vol.21 No.2

최근 IT 기술이 발전함에 따라 교육형태도 많이 발전되고 있다. 특히 IT 기기를 활용할 수 있는 온라인 교육에 집중되고 있다. 온라인 교육 시스템 중 하나인 MOOT(Massive Open Online Textbook)이 주목받고 있다. MOOT는 텍스트 중심의 교육 기반이며, 온라인 교재 내에 실습환경이 있어 언제 어디서나 학습자가 자기주도적인 학습을 할 수 있도록 도와준다. 온라인을 통해 학습하기 때문에 수많은 학습자의 학습현황을 쉽게 파악할 수 없는 문제점이 제기되었다. 따라서 본 논문에서는 데이터 결과를 한 눈에 파악할 수 있도록 시각화를 제안하여, MOOT시스템 내에서 학습한 고려대학교 343명의 학생 데이터를 기반으로 학습자 데이터 시각화를 설계하였다.

무선 센서 네트워크에서 확장성과 오류 허용성을 고려한 데이터 중심 라우팅 기법

허윤강(YoonKang Hur),허혜선(HyeSun Hur),김종원(JongWon Kim) 한국통신학회 2005 한국통신학회 학술대회논문집 Vol.2005 No.11

책문화 활성화를 위한 작은도서관 공간계획

허윤미(Hur, Yun-Mi),김동훈(Kim, Dong-Hoon) 한국실내디자인학회 2016 한국실내디자인학회 학술대회논문집 Vol.2016 No.05

Korean book culture changes following the time flow and the bookstore should be changed into a space to fill the user"s need. Bosudong bookstore alley having the 60-year-old history is a place representing the Korean old book culture but it is declining quickly due to the change of the book distribution system and the backward infra. On the other hand, Small Library is rising as a central space of the community facility and is establishing itself as a small-sized cultural space leading a new book culture. Although Small Library uses a name of library, it does not only mean the physical space such as the public library but also means a library that changes the life and society made by the voluntary participation of local residents. This study suggests a direction for developing into a community facility of Small Library and analyzes the coexistence program using the local feature. The case that satisfies the basic concept(space composition) of the library and that +A function(contents) are utilized as an exchange space is analyzed. Small Library is expected to be a local community which will lead a new book culture by planning a space after researching/analyzing a new pattern driving from the reading/exchange behavior, and by suggesting a proper exchange program.

The Effect of Directed Reading-Thinking Activity Using Children's Literature on Primary English Education

허윤화(Hur Yoon Hwa) 한국초등영어교육학회 2014 초등영어교육 Vol.20 No.3

This study aims to develop children's literature-based Directed Reading-Thinking Activity model for English teaching and learning using graphic organizers in elementary schools. The subjects are fourteen sixth grade students who participated in the extracurricular activities in an elementary school. This model is made up of the following three phases: 1) the "Predicting, Reading, and Proving" process to delve into each different phase of the text, 2) the use of graphic organizers to grasp at the gist of the textual flow, and 3) the "Expanding and Refining Concepts" step to go beyond the textual boundaries on the basis of students' prior knowledge. The researcher has analyzed students' English ability test results, learning journals, teaching journals, interviews, and the survey results about both students' reading strategies and their affective domain responses. The overall appreciations of story elements in literary texts were also included in the analysis process. The major findings are as follows. First, this model contributed to improving students' English ability, especially for the higher level students. Second, the "Predicting, Reading, and Proving" process is effective in developing students' reading strategies as well as improving their overall reading comprehension. Third, the middle and lower level students pose more positive attitudes to the graphic organizer-based tests than the higher level students. Finally, this model shows positive improvements in the affective domain, except confidence and anxiety. In conclusion, this study has pedagogical implications on English teaching and learning.

보문 : ZnO와 TiO2 함유 복합나노섬유의 제조와 유해물질분해 성능 평가

허윤선 ( Yoon Sun Hur ),이승신 ( Seung Sin Lee ) 한국의류학회 2011 한국의류학회지 Vol.35 No.11

This research investigates the application of ZnO (zinc oxide) nanoparticles and TiO2 (titanium dioxide) nanoparticles to polypropylene nonwoven fabrics via an electrospinning technique for the development of textile materials that can decompose harmful gases. To fabricate uniform ZnO nanocomposite fibers, two types of ZnO nanoparticles were applied. Colloidal TiO2 nanoparticles were chosen to fabricate TiO2 nano- composite fibers. ZnO/poly(vinyl alcohol) (PVA) and TiO2/PVA nanocomposite fibers were electrospun under a variety of conditions that include various feed rates, electric voltages, and capillary diameters. The morphology of electrospun nanocomposite fibers was examined with a field-emission scanning electron micro- scope and a transmission electron microscope. Decomposition efficiency of gaseous materials (formaldehyde, ammonia, toluene, benzene, nitrogen dioxide, sulfur dioxide) by nanocomposite fiber webs with 3wt% nano- particles (ZnO or TiO2) and 7g/m2 web area density was assessed. This study shows that ZnO nanoparticles in colloid were more suitable for fabricating nanocomposite fibers in which nanoparticles are evenly dispersed than in powder. A heat treatment was applied to water-soluble PVA nanofiber webs in order to stabilize the electrospun nanocomposite fibrous structure against dissolution in water. ZnO/PVA and TiO2/PVA nanofiber webs exhibited a range of degradation efficiency for different types of gases. For nitrogen dioxide, the degradation efficiency was 92.2% for ZnO nanocomposite fiber web and 87% for TiO2 nanocomposite fiber web after 20 hours of UV light irradiation. The results indicate that ZnO/PVA and TiO2/PVA nanocomposite fiber webs have possible uses in functional textiles that can decompose harmful gases.

파이퍼와 바드 : 『순수의 노래』와 『경험의 노래』에 나타난 예언의 소리

허윤덕(Hur Yoon-Deok) 새한영어영문학회 2006 새한영어영문학 Vol.48 No.3

Song of Innocence and Song of Experience criticize the established way of seeing and thinking, and proclaim the regeneration of Earth through the prophetic speakers, Piper and Bard. The Piper perceives the world by way of transcending the barriers of time and space and of the divine, the human, and the natural. Innocence, despite its limitations, is seen as the essence of humanity which Blake prophesy will realize in the future, and has something inseparable to do with imaginative perception. But, unlike the Piper, the Bard is conscious of his ability to penetrate these barriers, and he uses this ability, as well as his power of insight, in order to reform the condition of society and mankind. Through the Bard, Blake reveals that the ultimate cause of social evils consists not in the established systems but in the "mind-forged manacles," the passive psychology that accepts them and looks upon them as the inevitable things. Blake renders his prophetic perception of the world through his own rhetorical and experimental poetic devices such as syntactical and semantic ambiguities, and organic and transfiguring uses of religious, political, and literary traditions. And he also delivers the reader's mentality from the confines of established conception and conventional modes of thinking and awakens man's dormant capacity for perception of the infinite in the world.

고객 세분화에 따른 항만 선호도 비교분석

허윤수(Yun Su Hur),김율성(Yul Sung Kim) 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.3

본 연구에서는 항만의 주요고객인 선사를 대상으로, 국외선사와 국내선사로 세분화하여 속성의 중요도와 항만 선호도 차이를 비교 분석하였다. 컨조인트 분석 결과 국내선사와 국외선사 간의 항만선호도에서 분명한 차이를 보였으며, 이러한 차이는 기항지와 환적항에서 동시에 나타났다. 국외선사들은 환적항으로서 상하이항을 가장 높게 평가했지만, 국내선사들은 부산항을 상하이항보다 높게 평가했다. 또한, 기항지 선호도 비교에서도 비슷한 결과를 나타냈다. 이러한 연구결과는 국내외 선사에 따라 항만 선호도가 다르기 때문에 집단별로 구분하여 평가할 필요가 있음을 의미한다. 또한, 이를 바탕으로 타항만에 비해 경쟁우위에 있는 부산항의 선호도를 유지하기 위해서는 지속적인 목표(Target) 마케팅이 필요하며, 주요 목표 (Target)는 항만의 주요 고객인 선사임을 암시한다. In this paper, we estimate the difference of port preference and attributed importance by diving subjects of the survey into internal and external shipping companies considered as the main customers of port. From the results of conjoint analysis, it is found that there are differences in preference between domestic shipping companies and foreign ones. The difference in port preference shows ; foreign shipping companies mark Shanghai port in the first place in the preference of transshipment port, while domestic shipping companies prefer Busan port. Similar results are applied to preference of calling port. The result of the survey means it is necessary to group shipping company, when port is analyzed, because the port preference is subject to wether internal or external shipping companies. Also, it implies target marketing strategies should continuously be needed in order to maintain Busan port’s preference gaining advantage over other ports and major target would be shipping companies.