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TV 제스처 상호작용 위한 제스처의 적합성 평가에 대한 연구
류태범(Taebeum Ryu) 사단법인 인문사회과학기술융합학회 2019 예술인문사회융합멀티미디어논문지 Vol.9 No.2
본 연구의 목적은 스마트 TV 명령어의 한 조작 방식인 제스처 상호작용의 적절성을 분석하는 것이다. 제스처 상호작용의 기존 연구들은 (1) 사용 사례에 기반한 상황적 접근, (2) 효과적 제스처 적용을 위한 기술적 접근 그리고 (3) 제스처-명령간의 상황적 관계를 찾는 연계성 접근의 세 종류로 나눌 수 있다. 그러나 제스처의 적용성을 평가한 연구는 거의 없는 형편이다. 이를 위해 ‘제스처 적절성 점수’와 명령어 변수’ 간의 관계 파악을 위한 실험이 수행되었다. 스마트 TV 87개 명령어가 수집되었고, 명령어 변수로 빈도, 수준, 종류가 선택되었다. 그리고 수집 명령어의 수준이 구분되었다. 제스처 적절성 점수는 명령 변수의 수준에 따라 유의하게 달랐고, 명령변수의 최적 수준이 다중회귀분석으로 도출되었다. 연구결과로 부터 높은 빈도, 낮은 수준, 네비게이션 종류의 명령어가 제스처 변환에 적절한 것으로 나타났다. 본 연구 결과는 설계자가 제스처 인터페이스 설계에 적합한 명령어를 선택하는데 기초자료로 활용할 수 있을 것이다. The purpose of this study is to analyze the types of commands are appropriate to gesticulate when controlling a smart TV. Previous studies on gesture interface could be classified into three approaches; (1) contextual approach: how to suggest appropriate gesture based on the use case, (2) technological approach: how to implement gesture interface effectively and efficiently, (3) relationship approach: how to find the contextual association between command and gesture. However few studies exist emphasize the ‘gesture-ability’ of commands. The experiment was conducted to understand the relationship between ‘gesture-appropriate score’ and ‘command variables’. For the experiment, eighty seven commands of smart TV were collected and three command variables (‘frequency’, ‘depth’, ‘type’) were selected. Also, levels of each command variable were classified. Gesture-appropriate scores were significantly different between the levels of each command variable. The optimal levels of each command variable were suggested by conducting multiple linear regressions. From the results, we found that high frequency level, low depth level, navigation/move type commands were preferred as a gesture interface. With the results of this study, the designers of gesture interface are able to consider the important command variables for designing gesture interface.
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Prevalence and Causes of Musculoskeletal Disorders in Korean Dentists
류태범(Taebeum Ryu) 한국산업경영시스템학회 2012 한국산업경영시스템학회지 Vol.35 No.4
Dentists are known to be highly exposed to the musculoskeletal disorders (MSD). The present study investigated the prevalence of MSD among Korean dentists and association between their MSD and physical workload. In addition, detailed causes related to the physical workloads were identified in dental operation, and needs for improvement of dental instrument and environment were collected from Korean dentists. The standardized Nordic questionnaire was used to survey body troubles and three types of questionnaires were made to investigate the physical workloads, causes of the physical workloads and improvement priority of dental equipments, respectively. A total of 104 Korean dentists were participated in the survey. Neck trouble (82%) was the most prevalent in Korean dentists, and shoulder (68%) and low back trouble (56%) followed, while low back trouble was reported to be most frequent in previous studies. The body troubles were related to the physical workload of the corresponding body parts, although they were not associated with personal characteristics. Most Korean dentists selected ‘to keep direct view inside patient’s mouth’ and ‘no support of the hand with dental instruments’ as the causes of awkward and strenuous work postures. They wanted design improvement for some equipment in their operating room such as operating light and arrangement of workplace.
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류태범(Taebeum Ryu) 한국산업경영시스템학회 2012 한국산업경영시스템학회지 Vol.35 No.4
Of many approaches to reduce motion analysis errors, the compensation method of anatomical landmarks estimates the position of anatomical landmarks during motion. The method models the position of anatomical landmarks with joint angle or skin marker displacement using the data of the so-called dynamic calibration in which anatomical landmark positions are calibrated in ad hoc motions. Then the anatomical landmark positions are calibrated in target motions using the model. This study applies the compensation methods with joint angle and skin marker displacement to three lower extremity motions (walking, sit-to-stand/stand-to-sit, and step up/down) in ten healthy males and compares their performance. To compare the performance of the methods, two sets of kinematic variables were calculated using different two marker clusters, and the difference was obtained. Results showed that the compensation method with skin marker displacement had less differences by 30~60% compared to without compensation. And, it had significantly less difference in some kinematic variables (7 of 18) by 25~40% compared to the compensation method with joint angle. This study supports that compensation with skin marker displacement reduced the motion analysis STA errors more reliably than with joint angle in lower extremity motion analysis.
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한 손을 이용한 스마트폰 문자입력에서 선호손의 신뢰도 및 수행도 분석
류태범(Taebeum Ryu) 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.10
Does preferred hand show better performance than non-preferred hand in smart phone text entry using one hand? Is the performance of subjects who use left-preferred hand in smart phone text entry worse than that of others who use right-preferred hand among the right handed? This study tried to address these two questions. Thirty young male undergraduate students typed a text using a smart phone which has a touch-based QWERTY keyboard two times with both hands, right and left hand, respectively. The completion time, errors were measured in the text entry tasks. All of participants were right-handed, but half of them preferred right hand if they have to use one hand in smart phone text entry and other half preferred left hand. The percentage that preferred hand has better performance than non-preferred hand in smart phone text entry using one hand is less than 90% for right-preferred hand and less than 70% for left-preferred hand. The performance of left hand preferred students is not worse than that of the right hand preferred in one hand text entry of smart phone.
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휴대용 전자 제품의 무게와 크기에 따른 만족도 및 선호도 분석: 휴대용 충전기를 중심으로
류태범(Taebeum Ryu),박재현(Jaehyun Park) 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.5
Objective: This study aimed to figure out the weight that the user satisfies according to the size of products, targeting product family that users generally do not prefer heavy ones. Background: The sense of the weight of an object has been regarded as an important research topic in the perspective of perception. It is also known to be influenced by weight, size, color, and material of the object. The sense of the weight of a product can be a factor influencing affective satisfaction. However, the research regarding both the size of products and the weight of those has been still insufficient. Method: A portable charger that users generally do not prefer heavy ones was selected as a product to be tested. For the experiment, a total of ten portable chargers were prepared by allowing the selected two sizes of portable charger products to have five weight levels determined based on commercial weight. Totally forty participants in their twenties evaluated the satisfaction, preference, and sense of the weight of portable chargers of different weights and sizes. Results: The satisfied and preferred weight of the portable charger was found to be 140g, which is lighter than the commercial weight in two sizes (180g, 300g) of portable chargers. Satisfaction and preference of portable chargers lighter than 140g did not statistically higher or were rather low. Conclusion: A size-weight illusion was confirmed from the perspective of the sense of the weight of the portable charger. In addition, there can be a limit to the weight with high satisfaction and preference in products in which heaviness is not preferred, which means that if the weight is far lighter than expected, it has a negative effect. Application: The limit weight presented in this study can be used to determine the weight of the portable charger.
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Development of representative body models of spinal cord disabilities for agricultural equipments
Taebeum Ryu(류태범),Taegu Kim(김태구),Yunjae Kim(김윤재) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: This study was intended to create a representative human body model used in the anthropometric design of agricultural tools for people with spinal cord disabilities. Background: Korea’s agriculture is facing a manpower shortage due to a decrease in the population and an aging workforce. Involving disabled people in agriculture as a solution to the problem of manpower shortage in agriculture can help both agricultural workers and people with disabilities, and for this purpose, it is necessary to develop agricultural tools that disabled people can use in agricultural activities. Method: For this purpose, this study used the existing anthropometric data for the spinal cord disabled, and created a representative human body model using the method of boundary for the acceptance range of the distribution of human body size. Results: As a result of factor analysis analysis and human size selection method, 26 anatomical dimensions were reduced to 4 factors, and the human body model group had 16 poles in each dimension to have an acceptance rate of 90% of the human size distribution. made up of models. As a result of the evaluation of the acceptance rate of the representative human model group, only 42% of cases satisfying all 26 human body size ranges in the human body model group, but 88% of cases satisfying all 23 human body size ranges. was close to the rate. Conclusion: The representative human model group for spinal cord disorders was visualized using the Technomatix human model module. Application: This can be utilized in identification of problems with existing agricultural tools and anthropometric design of agricultural tools for the disabled.
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