Node.js에서 멀티쓰레드 기능의 필요성

김가연(Gayeon Kim),이욱진(Scott Uk-Jin Lee) 한국정보과학회 2016 한국정보과학회 학술발표논문집 Vol.2016 No.6

활성제 이온의 농도 변화에 따른 La₂MoO<SUB>6</SUB>:RE<SUP>3+</SUP> (RE = Eu, Sm) 형광체의 발광 특성

김가연(Gayeon Kim),신종언(Johngeon Shin),조신호(Shinho Cho) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.4

Eu<SUP>3+</SUP>- or Sm<SUP>3+</SUP>-doped La₂MoO6 phosphors were synthesized with different concentrations of activator ions via a solid-state reaction. The X-ray diffraction patterns exhibited that crystalline structures of all the phosphors were tetragonal systems with the dominant peak occurring at (103) plane, irrespective of the concentration and the type of activator ions. The crystallites showed the pebble-like crystalline shapes and the average crystallite size increased with a tendency to agglomerate as the concentration of Eu<SUP>3+</SUP> ions increased. The excitation spectra of Eu<SUP>3+</SUP>-doped La₂MoO6 phosphors contained an intense charge transfer band centered at 331 nm in the range of 250-370 nm and three weak peaks at 381, 394, and 415 nm, respectively, due to the <SUP>7</SUP>F0→<SUP>5</SUP>L7, SUP>7</SUP>F0→<SUP>5</SUP>L6, and <SUP>7</SUP>F0→<SUP>5</SUP>D₃ transitions of Eu<SUP>3+</SUP> ions. The emission spectra under excitation at 331 nm exhibited a strong red band centered at 620 nm and two weak bands at 593 and 704 nm. As the concentration of Eu<SUP>3+</SUP> increased from 1 to 20 mol%, the intensities of all the emission bands gradually increased. For the Sm<SUP>3+</SUP>-doped La₂MoO6 phosphors, the emission spectra consisted of an intense emission band at 607 nm arising from the ⁴G5/2→<SUP>6</SUP>H7/2 transition and three relatively small bands at 565, 648, and 707 nm originating from the ⁴G5/2→<SUP>6</SUP>H5/2, ⁴G5/2→<SUP>6</SUP>H9/2, and ⁴G5/2→<SUP>6</SUP>H11/2 transitions of Sm3<SUP>+</SUP>, respectively. The intensities of all the emission bands approached maxima when concentration of Sm<SUP>3+</SUP> ions was 5 mol%. These results indicate that the optimum concentrations for highly-luminescent red and orange emission are 20 mol% of Eu<SUP>3+</SUP> and 5 mol% of Sm<SUP>3+</SUP> ions, respectively.

데이터 기반 모바일 앱 분류 및 사용자 평가에 영향을 미치는 앱 속성 분석

김가연(Gayeon Kim),박기정(Kijung Park) 대한산업공학회 2020 대한산업공학회지 Vol.46 No.2

Nowadays a massive number of mobile apps are categorized and managed in an app store for users. However, ad-hoc category selection determined by app developers often causes ambiguous coverage across app categories. Also, the lack of understanding relationships between app attributes and user satisfaction leads to inappropriate app designs. Focusing on these issues, this study aims to provide objective app categorization and to identify significant app attributes for users. First, the text descriptions of more than 7,000 mobile apps in Apple’s iTunes were modeled through Latent Dirichlet Allocation. As a result, the existing 23 app categories were streamlined into seven categories. Next, relationships between app information and user rating data in each defined category were analyzed through Random Forest, and common features were identified as significant for user evaluation. The findings from this study provide implications for app categorization considering contextual similarities among apps and development of user-centered mobile apps.

학문 목적 한국어 교수자의 온라인 강의 경험에 관한 내러티브 탐구

김가연 ( Gayeon Kim ),장소영 ( Soyoung Jang ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.1

본 연구는 내러티브 탐구 형식으로 학문 목적 한국어 교수자가 온라인 강의 현장에서 어떠한 경험을 하는지 살펴보는 데 목적이 있다. 이를 위하여 2020년 9월 8일-10월 15일까지 학문 목적 한국어 교수자 3인을 1-3회 심층 면담하여 자료를 수집하여 전사하였고 전사된 자료는 분석적 메모와 코딩, 주제별 범주화를 거쳐 분석하였다. 그 결과 학문 목적 한국어 교수자는 혼란 속에서 수업을 준비하여 운영하였으나 학습자 관리의 어려움을 겪었다. 또한 실시간 온라인으로 한국어 말하기와 쓰기 활동을 할 때 교수자의 의도대로 진행하기 어려움을 알 수 있었다. 본 연구는 통계적 수치만으로 파악하기 어려운 학문 목적 한국어 교수자의 실제 교육 경험과 역할을 제시한 점에서 의의가 있다. 이는 향후 온라인 강의에 입문하려는 학문 목적 한국어 교수자들이 참고할 수 있는 기초 자료가 될 수 있을 것이다. The purpose of this study is to investigate the experience of Korean instructors for academic purposes on online lectures, which is conducted by a Narratvie Inquiry. In order to do this, I conducted in-depth interviews with 3 Korean instructors from Sept. 8th of 2020 to Oct. 15th of 2020. During that time, I interviewed them one to three times and I collected data and transcribed it. After that, I analyzed the transcribed data into these following procedures: analytic memo, coding and categorization of topics. I found Korean instructors prepared their classes in confusion and they had difficulty in managing learners. They also have trouble in their online classes of Korean speaking and writing activities in real time as they intended. This study is significant, in that it signifies the actual experience of these Korean instructors for academic purposes which is hard to understand with use of only statistics. Furthermore, this research can be used as an academic reference to these instructors who want to start online lectures in the future.

엔진 밸브용 내열강 표면처리에 따른 피로 특성 연구

김가연(Gayeon Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

단편소설을 활용한 중학교 다문화 배경 학습자의 읽기 교육 방안

김가연 ( Gayeon Kim ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.2

본 연구의 목적은 중학교 다문화 배경 학습자를 위한 읽기 교육 방안을 모색하는 데 있다. 이를 위하여 2017년에 개정된 한국어 교육과정(KSL)을 참고하였고 내용 중심 교수법(CBI)을 바탕으로 김유정의 단편소설 「봄봄」을 활용하여 총 4차시의 한국어 읽기 교육 방안을 마련하였다. 그 결과 1차시에는 소설의 시대적 배경과 작가를 탐구하고 소설을 바탕으로 제작된 애니메이션을 시청한 후 어휘학습을 한다. 2차시에는 소설을 읽고 주제 및 인물, 사건, 배경을 파악한다. 3차시에는 역할극을 준비하고 4차시에는 역할극을 수행하고 평가한다. 본 연구는 교육부의 지침을 바탕으로 중학교에서 한국어와 한국문화 교육을 직접 실행할 수 있는 방안을 제시하였다는 점에서 의의가 있다. 이는 장기적인 다문화 교육 지원 계획을 수립하거나 중등 한국어 교육과정에 필요한 교재를 개발할 때 참고할 수 있는 자료가 될 수 있을 것이다. The purpose of this study is to investigate teaching reading, to middle school learners who come from multi-cultural backgrounds. In order to complete this investigation, and with reference to a revised KSL curriculum of 2017, I conducted this study using CBI. To be more specific, I suggested the use of 4 reading class periods for teaching reading with Kim Yu Jeong’s short story, ‘Spring Spring.’ In the first period, learners are given enough time to study and understand the background of the story and the writer. After that, they watch an animation based on the novel and they learn the relevant and necessary vocabulary. In the second period, they will read the short story and grasp its theme, characters, events and location. In the third period, they will prepare group role plays and in the last period, they will present their role plays. It will be further expected that all of the group members assess their role plays within this last period. This study is significant, in that it suggests the manner in which to practice both Korean and the learning of the Korean culture in the middle school Korean classes, and it based on the guide lines provided by the Ministry of Education. It can be used as a reference when planning supporting programs for multi-cultural education and developing teaching materials for Korean as a second language curriculum for middle school learners.

반응형 웹 인터페이스 유형에 따른 UI기반 사용성 평가 연구

김가연(Kim, Gayeon),김수민(Kim, Sumin),현은령(Hyun, Eunryung) 한국디자인지식학회 2015 디자인지식저널 Vol.33 No.-

본 연구는 사용자들이 반응형 웹에 대해 이해하고, 반응형 웹의 필요성과 그들이 제공하는 최상의 사용자 경험을 도출하여 보다 발전된 반응형 웹 사용자 인터페이스(User Interface, UI) 디자인을 제안하는데 그 목적이 있다. 이를 위해 본 연구에서는 반응형 웹 UI를 크게 3가지 유형으로 분류하고, 설문조사와 심층면접을 통해 유형에 따른 사용성 평가를 실시하였다. 반응형 웹 유형별 선호도 분석결과, 사용하는 디바이스 별로 최고점수 74점, 최하점수 62점으로 그 차이는 12점이였다. 반면, 일반형 웹사이트의 UI평가에 대한 결과는 디바이스 별로 최고점수 59점, 최하점수 18점으로 그 차이는 41점이였다. 다시 말해 반응형 웹은 사용하는 디바이스의 종류와 관계없이 동일하게 제공되는 UI로 인해 사용자 만족도에 대한 큰 차이가 없었다. 그와 반면 일반형 웹은 사용하는 디바이스의 환경에 따라 최적화 되지 못한 사용자 인터페이스로 인해 사용자 만족도에 큰 차이가 있음을 알 수 있었다. 결과적으로 본 연구는 반응형 웹 디자인이 제공하는 편리한 UI 서비스의 필요성에 대해 인식하여 향후 반응형 웹 기술의 적용과 확산에 기여할 수 있을 것으로 기대한다. The purpose of this study was to examine ways of improving the understanding of users about responsive web and its necessity and to suggest a more advanced responsive web user interface design based on their best user experience. Responsive web user interfaces were largely classified into three types in this study, and a survey and in-depth interviews were conducted to determine the preference of the users for the different types of responsive web interfaces and to evaluate their usability. As a result of analyzing the evaluation of the users about the usability of the responsive websites, they gave different scores to the devices that they used. The scores ranged from a high of 74 to a low of 62, and there was a difference of 12 scores between the two. In contrast, the scores that they gave to the usability of general web sites ranged from a high of 59 to a low of 18, and there was a difference of 41 scores between the two. In other words, no significant differences were found in user satisfaction level with the responsive webs irrespective of the type of devices, since the same user interface was provided. On the contrary, there was a large disparity in user satisfaction level with the general webs depending on the environments of the devices, which was attributed to the user interfaces that weren"t optimized enough. This study is expected to raise awareness of the best UX-based ease of use of responsive web design and the necessity of responsive webs and to make a contribution to the extensive application of responsive web technology.

초소형위성 KAFASAT의 구조 및 열제어계 설계

김가연(Gayeon Kim),강전영(Jeonyoung Kang),이지민(Jimin Lee),김성환(Seong Hwan Kim),남정수(Jung-Su Nam),강병철(Byung Cheol Kang),최한솔(Han-Sol Choi),김종범(Jongbum Kim) 항공우주시스템공학회 2023 항공우주시스템공학회 학술대회 발표집 Vol.2023 No.10

한국어 교육학 분야의 질적 연구 동향 분석: 2015년-2021년 학술지 게재 논문을 대상으로

김가연 ( Kim Gayeon ),김영규 ( Kim Youngkyu ) 한국외국어대학교 외국어교육연구소 2022 외국어교육연구 Vol.36 No.4

The purpose of this study is a follow-up study to Sang-Mee Han (2016) and analyzes the trends of qualitative research published in five major journals in the field of Teaching Korean to Speakers of Other Languages (TKSOL). For this purpose, a total of 78 studies using a variety of qualitative research approaches were analyzed out of a total of 1,330 journal articles published between 2015 and 2021. The main findings are as follows: (1) Among the 7 qualitative research approaches, case studies and interpretive qualitative studies accounted for the majority; (2) The frequency with which each of the 6 data collection and analysis methods was used was in the following order: Interviews, introspective methods, document analysis, questionnaires with open-ended questions, observations, and qualitative interaction analysis; (3) When the qualitative studies in the field were analyzed by research topic, 60 studies, out of 78, related to ‘TKSOL teaching and learning’ were the most frequent, followed by 10 studies related to ‘TKSOL content’ and 8 studies related to ‘TKSOL in general’; (4) An additional analysis related to research ethics and research rigor/trustworthiness was performed, the result being that only 4 studies out of 78 were conducted with IRB approval, and 22 studies out of 78 described the process of securing the rigor/trustworthiness of qualitative studies. Based on the results from this study, it is suggested that research ethics and research rigor/trustworthiness should be considered and reported in subsequent qualitative studies in the field of TKSOL.

딥러닝 기반 리뷰 유사도 검사를 통한 온라인 쇼핑몰의 가짜 리뷰 탐지 성능 분석

김가연(Gayeon Kim),정혜리(Hyeri Jung),민지수(Jisoo Min),김혁만(Hyeokman Kim),이경용(Kyungyong Lee) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.12