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.

블록체인 서비스의 신뢰에 영향을 미치는 요인

장혜지(Hyeji Jang),한성호(Sung H. Han) 대한인간공학회 2020 대한인간공학회 학술대회논문집 Vol.2020 No.10

One of the differences of blockchain services from others is that transactions are made without relying on trusted third parties through encryption, consensus algorithms, etc. This is defined as “trustless”, which is not natural from the user standpoint. Rather, the way trust formation has changed is more acceptable. Despite the fact that trust should be treated importantly especially in the stage of emergence of new technology, only few studies treat the effect of trust on blockchain service users. This study aims to derive the factors that affect the trust of the blockchain services. A wide range of literature surveys and user surveys on blockchain services were conducted. As a result of classifying the factors collected from 43 documents and 32 experimental participants, a total of 8 factors were derived. An interpretation of each factor is provided in the paper. The results of this study is expected to help build trust in various blockchain services.

고전도도의 용액공정형 폴리아닐린: 캄포설폰산 복합재료의 최근 개발 현황

장혜지(Hyeji Jang),조성훈(Sunghun Cho) 한국고분자학회 2020 고분자 과학과 기술 Vol.31 No.6

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.

스마트시티 계획 수립에서 bottom-up approach의 중요성

장혜지(Hyeji Jang),곽지영(Jiyoung Kwahk),정다운(Dawoon Jeong),류현영(Hyun Young Ryu) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.5

This study aims to present the importance of the bottom-up approach by comparing and analyzing two approaches for establishing safe smart city design in Pohang. In order to solve various urban problems, or to develop the efficient new city, the world is paying attention to smart city. It is essential to combine top-d own and bottom-up approach in order to create citizen-sentiment smart city. Korea is also pursuing for various smart city plans, but most are government driven. To collect plans that are underway or being targeted, interviews were conducted with the person in charge from 18 departments of Pohang city hall. As part of the Bottom-up method, a survey was conducted on Pohang citizens to collect safety-related requirements. The responses collected through each method were classified by open card sorting and compared. Pohang city plans were classified into four categories: hardware improvement, software improvement, service procurement, and data and technology. The responses collected from 297 citizens were classified as functional requirements, non-functional requirements, and emotional discomfort. As a result of comparing two approaches, it was confirmed that there is a difference in the scale and items of the problem to be solved. In addition, it was shown that there was a limitation to the utilization of data and technologies. The results of this study indicate necessity of a bottom-up approach and participation of various organizations when establishing a smart city plan.

스마트시티 수립 계획에서 시민 설문 조사 분석 시 고려 사항 제안

장혜지(Hyeji Jang),곽지영(Jiyoung Kwahk),정다운(Dawoon Jeong) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10

Smart cities are gaining interests worldwide recently. Lessons are learned in previous efforts that the citizen engagement is key to the success of a smart city. The citizen survey is one of the most popular methods used in planning a smart city in a participatory manner. In most cases, the survey data is often analyzed by the mean rating scores (e.g, 3.5 out of 7 point scale) or the percentage of the respondents (e.g., 35% agreed), in which all the participants were considered as a whole. This often results in a limitation in interpreting the results as an effective reflection of the opinion of citizens. The goal of this study is to suggest human factors considerations for analyzing the citizen survey data collected in designing a human-centered smart city based on a study applied to Pohang City. A total of 507 citizens participated in the survey conducted to discover the citizen opinions in determining the goal of Pohang Smart City, in which 50 questions related to the economy, safety, and quality of life were surveyed. The participants were grouped into six criteria: sex, age, occupation, district, length of residence, and type of economic activity in Pohang. ANOVA and Duncan tests were used to identify statistically significant differences among the citizen groups for each question item. The results of this study suggest that the factors influencing the survey results should be considered in interpreting the citizen survey results so that the opinions of citizens can be understood more effectively. The results of this study contributed to identifying the key characteristics of the target persona and to making design decisions in designing the user journey.

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.

블록체인의 사용자경험 요소 도출

장혜지(Hyeji Jang),한성호(Sung H. Han),김주환(Ju Hwan Kim),권기민(Kimin Kwon) 대한인간공학회 2020 대한인간공학회 학술대회논문집 Vol.2020 No.6

Blockchain enables a decentralized system to operate. It can provide benefits to users such as improving impartiality, stability, reducing service costs, and processing time. The number of decentralized applications (DApp) is now exploding. Users could receive new values and experiences through the blockchain products or services. It is important to provide a good UX for products or services that introduce blockchain. However, there are a few research studies on what factors the blockchain product or service should consider to provide a good UX. This study aims to derive the components of blockchain user experience (UX). A literature survey, blockchain service analysis, and a user survey were conducted. A total of 96 articles, including 39 blockchain UX related articles, were collected. Service values and functions that obtained from introducing blockchain technology were identified from analyzing 126 blockchain services. Finally, a user survey was conducted on the blockchain-based cryptocurrency exchange. As a result, five components of blockchain UX including usability, affect, sociability, economic value, and trust were derived along with their sub-components.

대학생의 자기결정적 고독동기가 대인관계능력에 미치는 영향 : 자아존중감과 심리적 안녕감의 이중매개효과

장혜지(Jang, Hyeji),한유진(Han, Youjin) 한국생활과학회 2020 한국생활과학회지 Vol.29 No.2

iNOS 발현 검출을 위한 in vitro 시스템의 확립 및 적송잎 추출물에 의한 저해효과 검증

김남영(Nam-Young Kim),장혜지(HyeJi Jang),이동근(Dong-Geun Lee),장민경(Min-Kyung Jang),이승우(Seung Woo Lee),전명제(Myong Je Jeon),김미향(Mihyang Kim),김성구(Sung Gu Kim),이상현(Sang-Hyeon Lee) 한국생물공학회 2011 KSBB Journal Vol.26 No.2

This study was aimed to verify suppressive effect of pine-needle extract on lipopolysaccharide (LPS)-induced inducible nitric oxide synthase (iNOS) expression. In order to evaluate suppressive effect on iNOS expression, RAW 264.7 cells were stably transfected using an iNOS promoterluciferase reporter plasmid yielding RAW 264.7/pGL2-NeomiNOS_ pro11 cells. Established in vitro detection system revealed to diminish LPS-induced iNOS expression by 0.1~500 μg/mL of saponin at the concentration-dependant manner. Pine needle extract also diminished LPS-induced iNOS expression to 92 and 88% at 500 and 50 μg/mL, respectively. These results suggest that the in vitro detection system developed here could be useful for the verification of suppressive materials on iNOS expression and pine needle extract could be used for the development of functional foods.