Fabrication of Highly Conductive ABS Resin Composite for 3D Printing Processing

장혜지,조성훈 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

In this study, a ternary composite was prepared by introducing polyaniline (PANI) nanostructures and water-dispersible graphene (WDG) into a acrylonitrile-butadiene-styrene (ABS) copolymer matrix. The optimal content of the PANI/WDG cofiller system not only constitutes extended conductive paths inside the ABS resin, but also ensures excellent printability of the ABS composite resin. ABS resins with PANI/WDG cofillers were able to achieve significantly improved electrical properties compared to both pure resin and ABS resins with homostructured fillers. These results are due to the synergistic effects of the high redox activity of the PANI nanostructures and the excellent electron transport of the WDG sheets.

블록체인 기술에 대한 이해도가 암호 화폐 지갑의 신뢰에 미치는 영향

장혜지(Hyeji Jang),한성호(Sung H. Han) 한국HCI학회 2022 한국HCI학회 학술대회 Vol.2022 No.2

블록체인은 무신뢰 기술이라 불리며, 최근의 신뢰연구 흐름에 큰 영향을 미치고 있다. 그러나, 블록체인의 활용이 언제나 사용자들에게 무신뢰를 보장하지는 않는다. 블록체인의 신뢰에 대한 많은 사용자 중심의 연구가 진행되고 있으나, 여전히 이해가 필요한 부분이 남아있다. 특히, 자동화 기술과 같은 혁신적인 기술이 도입되었던 과거의 예시들은 기술에 대한 사용자의 이해도가 신뢰 형성에 매우 중요한 역할을 한다는 것을 밝혔다. 본 연구는 암호화폐 지갑을 예시로 블록체인 기술에 대한 이해가 신뢰에 미치는 영향을 파악하는 것을 목표로 한다. 이를 위해 블록체인에 대한 이해도를 기반으로 두 그룹으로 나누어진 32 명의 참가자가 8 개의 암호화폐 지갑의 신뢰와 관련된 상황을 이해하고 신뢰 관련 요인과 전반적인 신뢰에 대하여 평가하였다. 본 연구의 결과는 기술에 대한 사용자의 이해도가 일부 요인에 유의한 영향을 미친다는 것을 보여준다. 연구의 정량적, 정성적 결과를 기반으로 기술에 대한 이해도와 블록체인 서비스의 신뢰에 대한 해석이 제공된다. 본 연구는 블록체인 서비스의 설계자 및 제공자가 사용자의 신뢰를 효과적으로 관리하기 위한 근거 자료로 활용될 수 있다. Blockchain, a trustless technology, has a great influence on the recent flow of trust research. However, the application of blockchain does not always guarantee trustless to users. Although a number of user-centered research on trust in blockchain is performed, there are still questions needed to be understood. In particular, precedents where innovative technologies such as automation technology were introduced revealed that the user"s understanding of the technology plays an important role in forming trust. This study aims to understand the effect of understanding in blockchain technology on perceived trust by taking a cryptocurrency wallet as an example. To this end, 32 participants divided into two groups based on their understanding in blockchain grasped the 8 situations related to trust in cryptocurrency wallets and evaluated trust-related factors and overall trust. The results of this study show that the user"s understanding in technology has a significant effect on some factors. Based on the quantitative and qualitative results of the experiment, interpretation regarding to understanding in blockchain and trust in cryptocurrency wallet are provided. This study can be used as a basis for designers and providers of blockchain services to effectively manage user trust.

초등학생의 무용 활동경험이 정서 발달 및 건강관련체력 발달에 미치는 영향

장혜지 ( Hye Ji Jang ),박태섭 ( Tae Seop Park ),김상유 ( Kim Sang Yoo ) 한국여가웰니스학회 2013 한국레저사이언스학회지 Vol.4 No.1

본 연구는 초등학생의 무용 활동경험이 정서발달과 건강관련체력 발달에 미치는 영향에 대해 조사하였다. 무용을 통한 정서 발달에 미치는 영향에 대한 조사는 문용 린(1997)이 제작한 정서지능 검 사지를 활용하였으며 건강관련체력 발달에 미치는 영향은 학생건강체력평가의 측정자료를 수집하여 활용하였다. 수집된 자료를 각 학년(4, 5, 6학년)간의 무용 활동경험 유무에 따른 정서 발달과 건강관련체력 발달 차이를 살펴보기 위하여 이원변량분석(two way-anova)을 실시하였다. 이에 따른 연구결과는 첫째, 무용 활동경험 유무 및 학년에 따른 정서 발달의 차이를 분석한 결과 정서인식, 정서표현, 감정이입, 정서조절, 정서활용의 모든 하위 영역에서 정서지능 발달이 통계적으로 유의한 차이를 보였으며 학년과 경험 유무의 상호작용 효과에 있어서도 정서인식, 정서조절, 정서지능 평균득점에서 통계적으로 유의한 차이를 보이는 것으로 나타났다. 둘째, 무용 활동경험 유무 및 학년에 따른 건강관련체력 발달의 차이를 분석한 결과 학년에 따른 건강 건강관련체력 점수와 등급은 심폐지구력, 유연성, 근력, 근지구력, 순발력, 건강관련체력평가 점수와 등급에서 통계적으로 유의한 차이를 보이는 것으로 나타났다. 경험 유무에 따른 건강관련체력 점수와 등급은 유연성, 근력, 근지구력, 순발력, 건강관련체력평가 점수와 등급에서 통계적으로 유의한 차이를 보이는 것으로 나타났으며 학년과 경험 유무에 따른 건강관련체력 점수와 등급 차이 검증 결과는 통계적으로 유의한 차이를 보이지 않는 것으로 나타났다. The purpose of this study is to investigate effects of elementary school student`s dance activity experience on the development of emotion and health-related fitness targeting. For the effects on emotional development through dance, the emotional intelligence test by Moon Yong-rin (1997) was used and for the effects on health-related fitness, physical activity promotion system (PAPS) data was collected. To examine the difference between the development of health-related fitness and emotional development by the status of dance experience of each grader (4th, 5th, 6th), the collected data was treated as two wayanova. First, as a result of analyzing the difference of emotional development according to the status of dance activity experience and each grade, it showed a statistically significant difference in all subarea of emotional perception, emotional expression, empathy, emotional regulation, and emotional use. In case of the interactive effect with the grade and status of dance experience, it showed a statistically significant difference in the average score of emotional perception, emotional regulation, and emotional intelligence. Second, as a result of analyzing the difference of health-related fitness development according to the status of dance activity experience and each grade, The health-related fitness score and rank by each grade showed a statistically significant difference in the score and rank of cardiovascular endurance, flexibility, muscular strength, muscular endurance and reflexes. The health-related fitness score and rank by the status of dance experience showed a statistically significant difference in the score and rank of flexibility, muscular strength, muscular endurance and reflexes. It showed no statistically significant difference in the result of verifying the difference between the health-related fitness score and rank according to the status of dance activity experience and each grade.

북한 안보정책과 한반도 위기 북핵문제를 중심으로

장혜지 ( Hui Zhi Zhang ) 동국대학교 북한학연구소(구 동국대학교 안보연구소) 2014 북한학연구 Vol.10 No.2

북핵문제는 한반도위기와 밀접하게 연결되어 있다. 그러나 지금까지 북한을 둘러싼 주변국들은 북핵문제를 해결할 방법을 찾고 있지 못하다. 본 논문은 북한의 안보정책을 중심으로 북한이 핵을 개발하는 원인을 분석하고 북핵문제의 해결주도자는 누구이며, 그 해법은 어떠한 방향으로 나아가야 하는지를 탐구하였다. 그 결과, 한반도 정세가 위기상태를 벗어나고 있지 못한 작금의 상황이지만 김정은 체제 이후 최근의 북한은 미국을 위시한 주변 각국에 대해 적극적인 외교공세를 실시하고 있으며, 주변 각국들 또한 기본원칙을 견지하면서도 북핵위기를 타개하기 위한 대화의 유연성을 보여주는 양손정책(兩手政策)을 펼치고 있다고 분석했다. 때문에 향후 북한의 안보수요를 만족시키는 실질적 해법을 통해 현재의 한반도 위기를 대화와 해결의 기회로 전환시키기 위한 적극적 노력이 요구된다 하겠다. The DPRK nuclear issue is often related to the serious situation on the Korean peninsula but it has still not found a way to resolve it. The research is focus on the DPRK security policy and analysis why DPRK develop its nuclear program, who is the leading of the DPRK nuclear issue among China, U.S, or DPRK and ROK. Now the situation on the Korean Peninsula is serious again. On the other hand, DPRK is taking a diplomatic offensive, the neighboring countries insist on “DPRK abandons its nuclear aspirations” principle, at the same time, also reflect flexibilityso there still has a Potential Opportunity to change the crisis.

블록체인 서비스의 신뢰 측정 문항 개발

장혜지(Hyeji Jang),한성호(Sung H. Han) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.6

Managing trust is an important issue for service operators, as a high level of trust brings positive results to them. The emergence of blockchain technology, which is called a trustless technology, was very innovative as one of the trust management methods. Many researchers expect that the trustless potential of blockchain technology can remove the trust from services. However, careful approach is needed whether the trustless power can be fully applied to blockchain services. Recent studies assert that blockchain will not remove trust from services, but will significantly change the process of trust formation. This study aims to develop a questionnaire that can evaluate the trust level of the blockchain service as one of the actions to understand the trust formation in the blockchain service. The initial 14 questionnaire items were derived through literature survey and expert interviews. Based on the derived initial questionnaire, user survey was conducted for 260 blockchain service users. The final questionnaire was derived after checking reliability and validity through exploratory factor analysis and confirmatory factor analysis. The questionnaire items, and insights that are obtained from the process and results of the study are provided. This study is meaningful in that it conducted a fundamental exploration to help understand the trust formation of blockchain services.

7학년 광합성 개념의 지위 중복 변화에 따른 소집단 구성의 효과 분석

장혜지,김영신,Jang, Hye-ji,Kim, Youngshin 경북대학교 과학교육연구소 2017 科學敎育硏究誌 Vol.41 No.2

소집단 학습은 소집단 내 학생들 간의 상호작용을 통해 공동의 목표 및 과제를 해결해 나가는 학습 방법이다. 과학 교육에서 소집단 학습은 중요 학습 전략 중의 하나이며, 학업 성취도와 태도 향상에 효과적이다. 소집단 구성은 3명일 때 학생들이 적극적으로 참여하며 과학 탐구 능력 향상에 효과적인 것으로 보고되었다. 그러나 집단의 구성 방법 즉, 동질과 이질 집단으로 구성하느냐에 따라 그 효과가 다른 것으로 보고되고 있다. 따라서 이 연구에서는 집단의 구성에 따라 7학년 학생의 광합성 개념의 생태적 지위에 차이가 있는지를 검증하였다. 이를 위해서 7학년 학생 1107명을 대상으로 이질 집단과 동질 집단은 상위, 중위, 하위로 구분하여 구성하였다. 광합성 개념은 광합성 장소, 광합성 생성물질, 광합성 필요물질, 광합성 환경 요인 영역으로 구분하였다. 광합성 개념의 생태적 지위 변화에 대한 선행 연구에 기초하여 빈도율 4%이상인 개념을 선정하여 설문을 구성하였다. 설문지는 4가지 영역에 각각 제시된 관련 개념들에 대한 관련성 점수와 이해 수준 점수를 측정하였다. 이 연구의 결론은 다음과 같다. 1) 3명의 소집단 수업에서는 과학 개념 학습에 향상이 있었다. 2) 집단 구성 시 평균을 향상시키고자 할 때는 동질 집단으로 구성하고 구성원간의 편차를 줄이고자 할 때는 이질 집단으로 구성하는 것을 제안한다. 이 연구를 통해서 집단 구성에 따른 결과의 이중성에 대한 차이 또는 효과를 검증하는 구체적인 연구가 이루어지길 기대한다. Small group learning is an educational approach to allow students to solve the problems and to achieve a common goal. Especially, small group learning in science education is one of the most important educational approaches and effective to ensure understanding of a topic. Small group learning consisting of three students in science education maximize student understanding and learning efficiency. However, It is reported that the effects of small group learning on achievement show different results, corresponding to different grouping methods(homogeneous/heterogeneous). This study investigated the effects of grouping method on difference of ecological niche of photosynthesis concepts. To achieve this, 1107 7th students were composed of homogeneous and heterogeneous groups classified into top, middle, and bottom levels. The photosynthesis units were divided into four categories: the photosynthesizing place, the substances of photosynthesis, required materials for the photosynthesizing, and environmental factors affecting photosynthesis. A questionnaire was composed by selecting concepts having a frequency of 4% or more based on prior studies on the change of the ecological status of photosynthesis. The questionnaire was scored in terms of relativity and understanding on each of the proposed concepts in the four categories. The result of this study is as set forth below. 1) There was an enhancement of learning the concept of science in small group classes consisting of 3 students. 2) To enhance the average upon composing of a group, it is proposed that the group should be formed homogeneously, and to reduce the deviation between the members, it is proposed that the group should be formed heterogeneously. Through this study, it is expected that specific studies verifying the difference or effect on the duplicity of results are conducted based on the composition of groups.

해외직접투자의 성과요인에 관한 연구 : 중국 진출 한국기업을 중심으로

장혜지 ( Hui Zhi Zhang ),박기안 ( Ki An Park ),김찬경 ( Chan Kyung Kim ) 韓國國際經營學會 2005 國際經營硏究 Vol.16 No.3

인삼 추출 분말과 프로바이오틱 유산균 락토바실러스 플란타룸 NK181을 이용한 요구르트의 특성 및 검증

장혜지,정지은,유형석,이나경,백현동,Jang, Hye Ji,Jung, Jieun,Yu, Hyung-Seok,Lee, Na-Kyoung,Paik, Hyun-Dong 한국축산식품학회 2019 축산식품과학과 산업 Vol.8 No.1

장애인고용기업체의 고용경로가 장애인 고용의 질에 미치는 영향

장혜지 연세대학교 사회복지연구소 2024 한국사회복지조사연구 Vol.80 No.-

This study aimed to investigate the influence of hiring paths of businesses employing the disabled on the employment quality of workers with disabilities. For this purpose, multiple and logit regression analysis was conducted utilizing 2021 Survey on the Employment Status of the Disabled in Business. In terms of employment stability, compensation, potential for development, and relationships, it was found that the quality of companies that directly recruited workers with disabilities was higher than companies that indirectly recruited through job agencies. In terms of working conditions, awareness and understanding of persons with disabilities, it was found that the quality of employment of companies with indirect recruitment was higher than companies with direct recruitment. This study is meaningful in that it identifies the quality of employment that companies provide to workers with disabilities. In addition, various implications were suggested by analyzing the effect of the hiring paths of companies with disabled employees on each dependent variable that evaluates the quality of employment.

보행 약자의 보행 경험을 기반으로 하는 보행 지원 도구 아이디어 개발 방법

장혜지(Hyeji Jang),한성호(Sung H. Han),정동영(Dong Yeong Jeong),김주환(Ju Hwan Kim) 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11

Walking has many positive effects on daily life. Various products, services, and policies are being proposed to support mobility-challenged as the population of mobility-challenged increases. However, most of the existing solutions only aim to improve walkability. In addition, it is difficult for designers to understand the experience of mobility-challenged. The purpose of this study is to develop a service idea to improve overall walking experience of the visually, aurally and physically challenged based on their inconveniences during walking. The process of this study consists of three stages: experience collection, idea generation, and idea concretization. Focus group interview was used to collect and understand the experience of mobility-challenged, and morphological analysis was used to supplement the experience. Ideas for improving walking experience were derived using the methods such as why-why diagram and SCAMPER. Details of the derived ideas are developed using service description. In each process, the validity of the results was enhanced by the evaluations of target users and expert. A total of 21 walking support service ideas was derived. These ideas could develop into an assistive device for enhancing the walking experience of mobility-challenged. The results of this study suggest the importance of close cooperation between target users and experts. The proposed idea development process is applicable to the process of deriving a service idea for minorities.