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고혜민(Hye-min Ko),이경언(Kyung-eon Lee) 제주대학교 교육과학연구소 2023 교육과학연구 Vol.25 No.2
본 연구는 수학교육용 애플리케이션의 유형별 특징을 분석하는 연구이다. 과거와 유사하게 문제중심형이 가장 많았지만 최근에는 문제중심형과 개념중심형에 학습자의 학습 상태를 분석하는 인공지능 기능이 포함된 유형이 증가하고 있다. 학습 과정 측면에서는 문제를 해결한 후 틀린 문제에 대한 오답 노트를 제공하여 학습자가 실수한 부분을 확인하고 교정할 수 있도록 해주는 경우가 있었다. 오답 문제에 대한 복습의 기회를 제공하여 개념이나 내용에 대한 이해를 증진하는 것은 교실에서 이루어지는 수학 학습뿐만 아니라 수학교육용 애플리케이션에서도 중요한 요소이다. 또한, 초기 애플리케이션은 사전에 프로그램화된 방식에 따라 일방적으로 학습자료가 제시되는 경우가 많았지만, 최근 개발된 수학교육용 애플리케이션 중에는 학습자가 질문하면 그에 대한 답을 제공받거나, 수학 문제를 만들어 입력하고 답을 얻는 등 상호작용적 구성을 활용하고 있는 애플리케이션이 증가하였다. 스마트 환경에서의 학습에서 우려되는 점으로 학습자의 자기주도적 학습 능력이 낮아질 것으로 우려하는 경우가 많은데, 최근 애플리케이션은 학습 결과 분석, 오답노트 제공, 상호작용적 구성을 통하여 학습자 스스로 자기주도적으로 학습을 구성하고 학습 목표를 성취할 수 있도록 구성된 애플리케이션이 증가하고 있다. This study analyzed the characteristics of each type of math education application. Similar to the past study, problem-oriented types were the most common, but recently, the number of types including artificial intelligence functions that analyze learners' learning status is increasing. In terms of the learning process, there were cases where after solving the problem, a wrong answer note for the wrong question was provided so that learners could check and correct the mistakes. Improving understanding of concepts or contents by providing opportunities to review incorrect answers is an important factor in mathematical education applications as well as mathematical learning in classrooms. In addition, early applications often presented learning materials unilaterally according to a pre-programmed method, but among the recently developed math education applications, there were applications that used interactive composition such as receiving answers when learners ask questions, making, typing, and obtaining answers. Self-directed learning by learners is often feared to decrease as a concern in learning in smart environments. Recently, more and more applications are configured to organize learning self-directed and achieve learning goals through AI analysis of learning results, wrong answer notes, and interactive composition.
사용 정보 기반 추천 서비스를 제공하는 스마트미러 설계 및 구현
고혜민(Hyemin Ko),김세림(Serim Kim),강남희(Namhi Kang) 한국정보과학회 2017 정보과학회 컴퓨팅의 실제 논문지 Vol.23 No.1
사물인터넷 기술이 발전되면서 인터넷을 통해 상호 연결되는 일상의 사물들이 증가하고 있다. 또한 연결된 사물들을 활용한 많은 스마트 서비스들이 개발되고 있다. 사용자 주변의 사물들 중 거울은 생활 속에서 다양한 역할을 한다는 점에서 광범위한 기능 적용과 서비스 확장이 가능하다. 최근 특정 장소의 특정 목적과 관심사를 가진 사람들이 모인 곳에 설치된 다양한 스마트미러 상품들이 출시되고 있다. 그러나 대부분 제공되는 정보가 한정적이라는 제한사항이 있다. 이를 개선하기 위해 본 논문에서는 사용자 맞춤형 서비스가 가능한 스마트미러를 설계하고 구현한다. 제한하는 스마트미러는 기존 인터넷 서비스에서 제공하고 있는 정보를 활용하여 사용자에게 실시간 교통 정보와 뉴스, 일정, 날씨 등의 생활 정보를 제공할 수 있다. 또한 스마트미러 사용자의 이용 내역을 기반으로 추천 서비스를 제공할 수 있다. Advances in Internet of Things Technology lead to the increasing number of daily-life things that are interconnected over the Internet. Also, several smart services are being developed by utilizing the connected things. Among the daily-life things surrounding user, the mirror can supports broad range of functionality and expandable service as it plays various roles in daily-life. Recently, various smart mirrors have been launched in certain places where people with specific goals and interests meet. However, most mirrors give the user limited information. Therefore, we designed and implemented a smart mirror that can support customized service. The proposed smart mirror utilizes information provided by other existing internet services to give user dynamic information as real_time traffic information, news, schedule, weather, etc. It also supports recommendation service based on user usage information.
카테콜-키토산 하이드로겔의 대용량 합성과 자가 치유 특성 분석
최회영 ( Choi Hoe Young ),고혜민 ( Ko Haye Min ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
Chemical crosslinking is the most widely used method for hydrogel preparations. We prepared a hydrogel using chitosan catechol/polyvinyl alcohol and sodium tetraborate decahydrate (Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>·10H<sub>2</sub>O). The formation of hydrogels often presents inconsistent results and issues according to the reaction scale. Therefore, we measured and analyzed the self-healing property and viscoelasticity of hydrogels attributed to scale-up synthesis using a rheometer.
온라인 추천정보와 선호 유사성의 역할: 2단계 구매 의사 결정 모델을 중심으로
이재영 ( Jae Young Lee ),고혜민 ( Hye Min Ko ) 한국지식경영학회 2015 지식경영연구 Vol.16 No.3
In this study, we try to understand the role of online social recommendation and the similarity of preferences between the recommender and the recommender on consumer decisions in the framework of the two stage purchase decision-making process. Applying construal level theory to our context, we expect that the role of social recommendation and the similarity of preferences would vary over the stages in the two-stage decision making process. To test our hypotheses, we collected the data through an incentive compatible experiment, and analyzed the data with nested logit model. As a result, we found that the role of online social recommendation varies over the stages. Consumers take recommendation from similar others at the stage of consideration set formation, but no longer consider it at the stage of final choice. Consumers take recommendation from dissimilar others at the stage of consideration set formation. At the stage of final choice, however, consumers avoid choosing the option recommended by dissimilar others. The results of our study enrich the understanding about the role of social recommendation, and have implication to marketing practitioners who attempt to make online social recommendation system more efficient.
키토산-카테콜 하이드로겔의 카테콜 함유량에 따른 유변학적 특성 분석
방은지 ( Bang Eun Ji ),고혜민 ( Ko Haye Min ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
In this study, two types of chitosan-catechol polymers (a-CP and b-CP) were synthesized and mixed with polyvinyl alcohol (PVA) and sodium tetraborate decahydrate (Na<sub>2</sub>B4O<sub>7</sub>·10H<sub>2</sub>O) to form hydrogels. The characteristics of these polymers were tuned by varying the pH during their syntheses, and their structures were characterized using nuclear magnetic resonance spectroscopy and ultraviolet-visible spectroscopy. Rheological and self-healing properties of hydrogels were evaluated. As a result, the viscoelastic modulus was improved due to the increased functional group content, and the self-healing property was excellent regardless of the functional group content.
생체모방 폴리머의 구조 분석 및 폴리머 혼입율에 따른 시멘트 모르타르의 특성 변화
방은지 ( Bang Eun Ji ),최세진 ( Choi Se-jin ),고혜민 ( Ko Haye-min ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In this study, catechol-functionalized chitosan (Cat-Chit), a well-known bioinspired polymer that imitates the basic structures and functions of living organisms and biological materials in nature, was synthesized and combined with cement mortar in various proportions. The compressive strength, tensile strength, drying shrinkage, accelerated carbonation depth, and chloride-ion penetrability of these mixes were then evaluated. In the ultravioletvisible spectra, a maximum absorption peak appeared at 280 nm, corresponding to catechol conjugation. The sample containing 7.5% Cat-Chit polymer in water (CPW) exhibited the highest compressive strength, and its 28-day compressive strength was ~20.2% higher than that of a control sample with no added polymer. The tensile strength of the samples containing 5% or more CPW was ~2.311.5% higher than that of the control sample. Additionally, all the Cat-Chit polymer mixtures exhibited lower carbonation depths than compared to the control sample. The total charge passing through the samples decreased as the amount of CPW increased. Thus, incorporating this polymer effectively improved the mechanical properties, carbonation resistance, and chloride-ion penetration resistance of cement mortar.
카테콜 작용기를 함유한 키토산 고분자 혼입율에 따른 시멘트 모르타르의 특성 변화
최회영 ( Hoe Young Choi ),최세진 ( Se-jin Choi ),고혜민 ( Haye Min Ko ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
We synthesized catechol-conjugated chitosan (CCC) to study its usefulness as a construction material additive in cement mortar. The degree of catechol conju- gation (DOC<sub>cat</sub>) of the synthesized CCC was determined to be approximately 14% by UV-vis and <sup>1</sup>H NMR spectroscopy. Furthermore, the hydroxyl and amine groups in CCC could play a crucial role in hydrogen bonding, metal coordination, and cross-linking processes via interaction with adducts from cement mortar. In this study, we observed an improvement in the compressive strength and absorption rate, suggesting that CCC is a promising candidate for high-performance cement mortar.
혼합슬래그 잔골재 혼입율에 따른 생체모방 폴리머 혼입 모르타르의 유동성 및 공학적특성
배성호 ( Bae Sung-ho ),박사민 ( Park Sa-min ),김대성 ( Kim Dae-sung ),이재인 ( Lee Jae-in ),고혜민 ( Ko Haye-min ),최세진 ( Choi Se-jin ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In this study, as part of a study to solve the problem of aggregate supply and demand, blast furnace slag fine aggregate and ferronickel slag fine aggregate were used as substitutes for natural fine aggregate, and a bioinspired polymer, a catechol-functionalized chitosan, was used instead of the mixing water.