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Jaramier Cobrado Joibi(자라미엘),Yushin Lee(이유신),Yong Min Kim(김용민),Myung Hwan Yun(윤명환) 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11
Objective: This study aims to conduct a preliminary study on the changes of attention level and seated postural behavior during sustained cognitive task. Background: Attention is one of the essential element which determines success of the activity. People spend most of their time in a seated posture in their work and strive to maintain a certain level of attention. However, prolonged periods of cognitive activities may decrease attention level. Attention level is widely measured through electroencephalography (EEG) signals, however, such method is costly and demanding. Method: Participants undergo prolonged and different levels of visual cognitive tasks. A pressure mat is used to obtain the real-time center of pressure (COP) data as the measure of body postural sway. Task performance, subjective workload, and postural changes were compared according to period and difficulty of tasks. Results: The results indicate that diminishing of attention is related to the change of postural behavior. In addition, it was founded that task difficulty influences on both postural sway and frequently adopting posture. Conclusion: It was confirmed that there is a potential to detect the attention level of an individual through their seated postural behavior. Application: It is applicable in measuring attention level using pressure sensor as an alternative of EEG.
Cai Wang(왕차이),Yong Min Kim(김용민),Jaramier Cobrado Joibi(자라미엘),Ji Hwan Lee(이지환),Myung Hwan Yun(윤명환) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10
Objective: The aim of this study is to compare the cross-cultural differences in product preference among users from different countries, taking Mi band 3 as a case study. Background: With the development of global market, more and more products and services are sold across the globe. Users from different cultures have different behaviors, cognitive styles, and value systems. Therefore, product should be designed to meet the needs and preferences of users from different cultural groups. Method: Compared to traditional research method such as survey questionnaire or interview that requires variety of foreigners as participants, opinion mining from online reviews saves much more cost and time. We collected review data from the following three websites: Naver of South Korea, Jingdong of China, and Amazon of the United States. Firstly, product aspects were extracted from reviews according to word frequency. This indicates how much users are paying attention to different aspects of the product. Then, fine-grained sentiment analysis was conducted to find out customer satisfaction with different product aspects. Lastly, cross-cultural differences among three countries from the result were observed and compared. Results: The product aspects that rank within top 10 in all three countries were battery life, price, step count, and sleep monitoring. What the users from three countries complain the most about was the battery life that is shorter than its advertised duration. Many users also complain about how the screen becomes invisible under the sunlight. Korean think of Korean on the display, application, and manual as the most important feature of the smart band product. Chinese are more concerned about the variety of functions. American tend to use smart band mostly as activity tracker as they care the most about battery, heart rate, and step count and prefer to have the tracker mode for bicycle and swimming on smart band product. Conclusion: Although there exist similar issues among South Korea, China, and the United States, cross-cultural differences are shown in different product aspects such as language, aesthetics, gift, activity tracker function, outdoor visibility, and screen. Application: This research can suggest implications for making strategies in product internationalization and product localization for the global marketing of smart band.
스마트폰 환경에서의 은행 어플리케이션 만족도 요인 조사
강재윤(Jaeyoon Kang),이지선(Jisun Lee),이중희(Joong Hee Lee),이지환(Jihwan Lee),박동건(Donggun Park),자라미엘(Jaramier Cobrado Joibi),정세준(Seijun Jung),김윤기(Yoonki Kim),손민지(Minji Son),림 벤자민(Lim Benjamin Zhi Min),윤명환(Myung 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
금융 서비스 어플리케이션과 관련된 사용자 경험을 파악하기 위해 리뷰 크롤링을 활용하여 대표 금융서비스 어플리케이션에 사용자들이 남긴 리뷰들을 분석하여 문제점을 파악하고, 해당 어플리케이션의 사용성 평가를 진행하였다. 리뷰 크롤링에서는 다양한 사용성 관련 이슈가 도출되었는데 문제가 있었으나 해결된 기능에 대한 사용자의 불편 사항기록, 필수적인 보조 어플리케이션 설치의 필요성, 보조 편의 기능의 유무에 따른 편리성 이슈, 느린 속도에 따른 불편 등이 포함되었다. 이후 크롤링 결과를 바탕으로 항목을 작성하여 실제 사용성 평가를 수행하여 상관분석을 시행하였고 전체 과업 진행속도가 어플리케이션 만족도와 가장 큰 상관관계가 있음을 확인하였다. 과업 진행속도를 방해하는 요소로 추가 필수 설치 어플리케이션 등을 들 수 있으며 이 요소들에 대한 해결이 필요할 것으로 예상된다.