춘계총회 및 제 20 차 학술발표회 - 화학 / 분석 / 생리활성분야 [ P - 8 ] : 환삼덩굴 줄기의 항산화 , 이질산염 소거 및 항균 활성

허재연,정창호,심기환 한국식품저장유통학회 ( 구 한국농산물저장유통학회 ) 2002 한국식품저장유통학회 학술대회 Vol.- No.-

환삼덩굴 잎과 줄기의 화학성분

허재연,정창호,심기환 경상대학교 농업생명과학연구원 2003 농업생명과학연구 Vol.37 No.1

기능성 식품재료로서 환삼덩굴의 줄기와 잎의 이용성을 향상시킬 목적으로 암, 수로 구분하여 화학성분을 분석하였다. 일반성분 중 가용성 무질소물과 조단백질 함량은 잎에서 높게 나타났으며, 수분과 조섬유는 줄기에서 높게 나타났고, 줄기와 잎의 주요 무기성분은 K, Ca, P 및 Mg으로 나타났다. 유리당을 분석한 결과 숫잎과 암잎에서 fructose는 각각 0.16%와 0.10%로 나타났으며, 숫줄기와 암줄기에서 sucrose는 각각 0.37%와 0.24%로 나타났다. 비휘발성 유기산을 분석한 결과 acetic acid가 잎(4.99 mg%와 3.07 mg%)과 줄기 (3.18 mg%와 2.25 mg%)에서 가장 많이 함유되어 있었으며, lactic acid, succinic acid 및 formic acid 순으로 함유되어 있었다. 잎과 줄기의 아미노산 조성은 각각 다르게 나타났지만 잎과 줄기의 주된 아미노산은 aspartic acid, glutamic acid, isoleucine 및 lysine으로 나타났다. 잎과 줄기의 주요 지방산은 linoleic acid와 palmitic acid 였다. To study the potential of the Humulus japonicus leaves and stalks as materials for functional food, chemical components of the male and female plants were analyzed. Among general components of leaves and stalks, contents of nitrogen free extract and crude protein were higher in leaves than in stalks, whole contents of moisture and crude fiber were higher in stalks than in leaves. The major minerals contained were K, Ca, P and Mg. Among free sugars, frutose(0.16% and 0.10%) and sucrose(0.37% and 0.24%) were the highest in leaves and stalks of male and female plants, respectively. Of non-volatile organic acids assayed acetic acid was the most abundant in both leaves(4.99 mg% and 3.07 mg%) and stalks(3.18 mg% and 2.25 mg%), followed by lactic acid, succinic acid and formic acid. The amino acid compositions of leaves and stalks were different each other and aspartic acid, glutamic acid, isoleucine and lysine were the major amino acids in both leaves and stalks. Major fatty acid in leaves and stalk were linoleic acid and palmitic acid.

University Students’ Perception on Cooperative Learning in General English Course

허재연 인문사회 21 2019 인문사회 21 Vol.10 No.3

This research investigated university students’ perception on cooperative learning in general English course based on their expectation and experience in order to have a better understanding of its advantages and challenges and promote cooperative learning environment relevant to Korean EFL context. The pre- and post-course survey questionnaires of 91 students were administered and their group presentation reports and 14 voluntary students’ in-depth interview data were collected. The results showed that more students had favorable attitudes and responses to group based learning and activities. They expressed positive experience and advantages such as development of social skills and an increase in learning motivation while challenges they faced were revealed like difficulty in problem-solving process and a question of efficiency. Based on the findings, this study would put an emphasis on fostering cooperative learning environment and conditions and contribute to seeking for a successful implementation of cooperative learning.

University Students’ Perception, Expectation and Experience of TETE in General English Course

허재연 인문사회 21 2019 인문사회 21 Vol.10 No.1

This study explored university students’ perception, expectation and experience of TETE to have a better understanding of TETE and look for effective ways for TETE in Korean public schools. 93 students participated in the pre- and post-course survey questionnaires and two in-depth interviews with 12 voluntary students were conducted. The results indicated that a large number of students had positive attitudes and expectations of TETE. The students felt their speaking skills were better developed than before and TETE lowered their anxiety and tension. Based on the findings, this study would contribute to enhancing awareness of the importance of students’ voices and needs analysis for TETE and seeking for a better implementation of TETE and its applications relevant to given teaching contexts.

에너지기반 제어시스템을 이용한 무인항공기 종축제어 시스템 시뮬레이션

허재연,석진영,김승균 제어로봇시스템학회 2016 제어로봇시스템학회 국내학술대회 논문집 Vol.2016 No.3

철근 콘크리트 부재의 유효강성을 반영한 해석 기법

허재연,Heo, Jae-Yeon 한국건축구조기술사회 2003 건축구조 Vol.10 No.1

어린이용 모듈식 인터랙티브 실감형 장난감: PIRAMAZE

허재연(Huh, Jaeyeon),윤주현(Eune, Juhyun) 한국디자인학회 2017 한국디자인학회 학술발표대회 논문집 Vol.2017 No.11

밤나무 잎의 화학성분, 항산화 및 항균활성

정창호,허재연,심기환 한국식품저장유통학회(구 한국농산물저장유통학회) 2002 한국식품저장유통학회지 Vol.9 No.2

밤잎의 기능성 식품 및 의약품으로서의 활용도를 높이기 위한 일환으로 밤잎의 화학성분, 항산화 및 항균활성을 측정한 결과는 다음과 같다. 일반성분은 총당 11.95%, 조지방 11.50%, 조섬유 10.11%, 조단백질 7.50% 및 회분이 1.79%순으로 나타났으며, 주요 무기성분으로는 Ca과 K으로 그 함량은 각각 215.7 ㎎%와 196.6 ㎎%로 나타났다. 비타민 C의 함량은 12.5 ㎎%였으며, 유리당은 glucose 3.33%, fructose 0.25%, sucrose 0.022% 함유되어 있었다. 밤잎의 주요 지방산은 linoleic acid로 그 함량은 36.86%로 나타났다. 밤나무 잎의 주된 아미노산은 glutamic acid(295.4 ㎎%), proline(285.7 ㎎%), aspartic acid(245.5 ㎎%), arginine(240.8 ㎎%), phenylalanine(237.4 ㎎%) and leucine(230.6 ㎎%)로 나타났으며, 총 아미노산에 대한 필수아미노산의 비율은 48.3%이었다. 항산화 효과는 용매별 추출물에서는 methanol 추출물이 72.52%, 용매분획 추출물에서는 ethyl acetate 분획물에서 84.12%로 각각 높게 나타났다. 각종 용매별 추출물의 항균활성은 메탄올 추출물이 높게 나타났으며, 용매분획별 추출물에서는 ethyl acetate 분획층에서 다른 분획보다 높게 나타났다. To study the potential of the chestnut(Castanea crenata S.) leaves, as raw materials for functional food and medicine, chemical components, antioxidative and antimicrobial activities were carried out. The proximate composition was composed of total sugar 11.95%, crude fat 11.50%, crude fiber 10.11%, crude protein 7.50% and ash 1.79% and the components of major minerals were Ca 215.7 ㎎%, K 196.6 ㎎%. The content of vitamin C was 12.5 ㎎% and free sugar was composed of glucose 3.33%, fructose 0.25% and sucrose 0.022%. The major fatty acids in leaves of chestnut were composed of linoleic acid and the amounts of those showed 37.88% area percent. The major amino acids of chestnut leaves were glutamic acid(295.4 ㎎%), proline(285.7 ㎎%, aspartic acid(245.5 ㎎%), arginine(240.8 ㎎%), phenylalanine(237.4 ㎎%) and leucine(230.6 ㎎%). The ratio of essential/total amino acid was 48.3%, Methanol extract and ethyl acetate fraction showed stronger acitivty of the hydrogen donating activities, each of 72.52% and 84.12%, respectively. In solvent extracts using methanol, ethanol, ethyl acetate, chloroform and hexane, methanol extract showed the most effective antimicrobial activities. Antimicrobial activities of ethyl acetate fraction of methanol extract was higher than those of other fractions.

자존감과 영어 학습: 인도 국제학교 한국 아동 학습자들의 사례연구

권향은,허재연 인문사회 21 2020 인문사회 21 Vol.11 No.4

This study aimed at investigating Korean young learners’ self-esteem and English learning process in a new environment of India. To do so, this study employed a qualitative case study for in-depth understanding of individual learners’ characteristics, thoughts, feelings, emotions, and anxiety. Data were collected mainly using semi-structured interviews based on the results of two questionnaires (Self-esteem Inventory and Foreign Language Classroom Anxiety Scale) and analysed through conversation analysis. The findings showed three participants had different levels of self-esteem, learning styles and learning achievement which were affected by family support, English competence and anxiety, interpersonal relationship with peer groups (Korean and foreign friends) and teachers, and personality. Exploring these Korean young learners in little known learning contexts would help teachers and educators understand a diversity of Korean learners and their teaching and learning contexts around the world. 본 연구는 인도의 새로운 환경 속에 있는 한국 아동 학습자들의 자존감과 영어 학습 과정을 조사하는데 목적을 두고 있다. 이를 위해 본 연구는 학습자 개개인의 특성, 생각, 감정, 정서, 불안을 심층적으로 이해하기 위해 정성적 사례 연구를 채택했다. 데이터는 주로 두 개의 설문지(자아존중감 검사와 외국어 수업 불안감 척도)의 결과를 바탕으로 한 반구조화 면담으로 수집되었고 대화 분석을 통해 분석되었다. 조사 결과 세 명의 참가자는 가족 지지, 영어 능력 및 불안, 또래 집단(한국과 외국 친구) 및 교사와의 대인 관계, 성격 등의 영향으로 자존감, 학습 방식, 학습 성취도가 서로 다른 것으로 나타났다. 거의 알려지지 않은 학습 환경에 있는 이러한 한국 아동 학습자들을 탐구하는 것은 교사와 교육자들이 전 세계에 있는 다양한 한국 학습자들과 그들의 교육 및 학습 환경을 이해하는데 도움이 될 것이다.

Writing Feedback: The Benefits of Conferences

심주연,허재연 한국영어어문교육학회 2014 영어어문교육 Vol.20 No.3

This article investigates how one-on-one writing conferences benefit L2 writers in terms of students’ writing performance and their motivational thought process at tertiary level. This sixteen-week longitudinal study employed a qualitative data approach derived from a mixed-method study involving pre- and post-survey questionnaires from college students, their writing drafts and interviews. Overall, the findings suggest that teacher feedback helped: (i) to build up teacher-student mentorship through collaborative interaction; (ii) to improve students’ writing performance with supportive feedback; and (iii) to increase students’ intrinsic motivation and confidence, finally leading them to new learning goals. The analysis also points out the negative aspects of teacher feedback from conference sessions. Negative feedback without appending positive comments might undermine students’ autonomous learning and too many teacher comments were identified as demotivating factors, possibly leading learners to be over-reliant on teacher feedback. Some important implications of this study of writing feedback are discussed to highlight how the potential impact of teacher feedback could be optimized: teacher feedback should be used as a tool to increase student motivation, engagement, and interest. Furthermore, teachers should encourage students to have a strong sense of responsibility for their own writing.