마스터 제목 스타일 편집 마스터 텍스트 스타일을 편집합니다 둘째 수준 셋째 수준 넷째 수준 다섯째 수준 Capturing the effect of context on human performance in mobile computing systems Leon Barnard, Ji Soo Yi, Julie A. Jacko, Andrew Sears Lee Suk Jae

Introduction Motivation –Mobile device 의 특성 location, environment, connectivity (unpredictible) –Dynamic factors –Design, evaluation of desktop vs mobile device. ex) metaphor, Trade off ( increasing textsize decreasing information on sigle screen) Context –presumed to be a set of conditions or user states that influence the ways in which a human interacts with a mobile computing device –Brewster “ A more realistic environment can significantly change the interaction and this must be taken into account when designing and testing mobile devices” –Factor : Noise, lighting, stress, weather, task

methodology In this study, three specific contextual factor (task type, motion, and lighting level) were manipulated in order to determine their relative effect on performance of mobile device users. The goal is to establish a foundation by which the effect of context can begin to be more clearly understood.  One hundred twenty-six participants  a mean age of 21.8 Sitting group Walking group

Study objectives Experimental tasks and conditions Walking group Task : (1) Reading Comprehension (2) Word Search. Scenario : (1) Reading Comprehension + High-Light; (2) Reading Comprehension + Low-Light; (3) Word Search + High-Light; and (4) Word Search + Low- Light. Each scenario consisted of ten trials. Sitting group High Light : 260lux Low Light : 85lux methodology

Reading comprehension Word search methodology Walking condition Measures

Hypothesis 1 For the Reading Comprehension task, the effect of motion will yield strongly significant differences for all experimental measures. Hypothesis 2 For the Reading Comprehension task, the effect of changes in lighting will yield significant differences for all experimental measures. Hypothesis 3 For the Word Search task, the effect of motion will yield strongly significant differences for all experimental measures. Hypothesis 4 For the Word Search task, the effect of changes in lighting will yield significant differences for all experimental measures. methodology

Results Reading Comprehension motion lighting Motion x lighting interaction -Task 1 : reading comprehension

Results Reading Comprehension -Task 1 : reading comprehension

Motion lighting Motion x Lighting interactions Results (Task 2 : Word Search )

Results Word search (Task 2 : Word Search )

Discussion SignificantNot significant Reading -motionTLX, score, reading timeResponse time, scrolls Reading – lightingResponse time, scrolls, TLX Reading time, scrolls Word – motionTime, score, TLX Word - lightingtimeScore, TLX

Conclusion 매우 다양한 환경에서 사용되는 Mobile computing device 는 다양한 situational context 에 의해 human user 의 행동에 영향을 미치며 mobile device 에 관련된 능력에 영향을 미친다. Contextual environment 에 의한 인간 행동에 미치는 영향은 uniform 하지 않 다. 특히 인간의 attentional resources 를 집중할 수 없는 ( 운전 등 ) 에서는 context 를 고려한 device 와 인간이 multiple task 를 다루는 방법이 특히 중요 하다. 이 연구는 pen-based mobile computing 이라는 제약이 있었지만 최대한 real world 에 가까운 condition 을 이용하였음에 의미있는 연구라고 생각되어진다.