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사용자 경험 조사를 통한 포터블 덴탈 엑스레이기기 디자인 개선방향

Developing Improvement Directions of Design of Portable Dental Radiography Equipment through Investigating User Experience

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주제분류경영학

초록

인간의 기대 수명 증가와 헬스케어 산업에 대한 관심 고조를 배경으로 의료행위의 패러다임은 치료를 넘어 질병 예방 및 건강관리로 확대되고, 환자안전 및 의료사고 문제와 기기의 사용오류와의 관련을 인식하면서 의료기 개발에서 사용성 검증이 의무화되는 추세이다. 이에 본 연구에서는 치과용 이동형 방사선 촬영기기 개발에 있어 사용자 관점의 반영과 사용편의성 제고를 위해 사용성 평가 및 분석을 통해 제품개선방향을 도출했다. 사용자 만족도 수준의 측정을 위한 설문지는 예측된 사용성과 경험된 사용성 측정을 위한 문항으로 구성되었고, 해당 설문지를 활용해 UX 디자이너 10명을 대상으로 조사를 실시했다. 조사결과는 비모수 통계검증에 의한 정량적 방법과 관찰․인터뷰 자료를 바탕으로 인사이트를 도출한 정성적 방법으로 분석되었다. 예측된 사용성 평가에서 카메라 타입 제품 2종과 건타입 제품 2종에 대한 사용전 만족도 비교를 위해 크루스칼-왈리스 검증, 사후분석 차원에서 본페로니 보정법 적용 후, 만-휘트니검정을 실시한 결과, 카메라 타입과 건타입 제품 간에 순위차이가 확인되었다. 경험된 사용성의 정량적 평가를 위해 스피어만 순위상관분석을 실시한 결과, 만족도와 유의한 상관성을 갖는 요소는 거치대와 방향조준으로 확인되었고, 이 두요소와 상관성을 갖는 요소로는 기기무게, 효과음, 촬영버튼인 것으로 나타났다. 이에 정성적 평가에서 수집된 이들 요소에 대한 사용자 의견을 바탕으로 개발, 개선방향을 도출, 제안했다.

Abstract

With increasing life expectancy of human beings and growing interest in the healthcare industry, the paradigm of medical practice extends, rather than staying at treatment, to disease prevention and health management. As aware that patient safety and medical incidents are possibly from poor device design, medical device manufacturers have been asked to implement usability examination in their medical device development process. Hence, this study aims at drawing development direction of portable dental radiography equipment based on quantitative and qualitative usability tests to reflect users’ point of view. User experience of the device was measured with a working prototype and a questionnaire developed through reviewing and refining questions with four UX designers. Using the questionnaire consisting of questions of expected usability to figure out preference of gun type products to camera type products, and experienced usability to find out users’ level of satisfaction in using the prototype, ten UX designers gathered through convenience sampling were surveyed. During the survey, they were asked to answer to the questions right after performing given tasks by specific use flow of the product, were observed by our research team and interviewed about why they did certain behaviors or gestures. In the expected usability part, the results of a Kruskal-Wallis test and a Mann-Whitney test with the Bonferroni correction method for the verification of post-analysis confirmed difference in ranking between two camera type and two gun type products. In the experiencef usability part, the results of a Spearman Rank Correlation test identified two factors of collimation and the cradle both of which have the same influential factors of device weight, effect sound, and the shooting button. Accordingly, focusing on the five factors, more specific directions of development and improvement were derived and suggested based on user opinions from interview and observation.

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