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양대용,정병희,윤창원 한국경영과학회 1994 經營 科學 Vol.11 No.1
This paper discusses the methodology for the operational performance of unit-load automated guided vehicles(AGVs) in a flow-shop-type flexible machining and assembly systems(FM /AS). Throughout the paper, AGVs are working as a carrier and mobile workstation. For a double-loop FM /AS, in which one loop is dedicated to machining and the other to assembly, three AGV operating strategies are proposed. Considering the entering interval and travel time of AGVs between workcenters, the strategies are developed to determine the best job sequence which minimizes the makespan and vehicle idle time. Entering times job sequence. When the number of AGVs are limited, entering times of times of AGVs are adjusted to maximize the utilization of AGVs.
양대용,정의승 대한인간공학회 2022 大韓人間工學會誌 Vol.41 No.5
Objective: This study investigated an effect of a level of physical workload on individual's ability of time perception. Background: Having a low discrepancy between a clock time and perceived time indicates a good health condition. While previous studies have found an effect of mental workload on perceived time, no study had yet revealed a relationship between physical workload and time perception. Method: Thirty participants evaluated to assess the subjective physical workload of four different tasks using Borg Category Rating 10. They were, then, asked a perceived time spent on each task to calculate a time perception ratio to a clock time. Heart rate was also measured before and after each task to calculated change in heart rate. Results: A level of subjective workload, measured by Borg Category Rating 10 (CR 10), was highly correlated with a change in heart rate. Using the two measures of physical workload, we found a strong correlation between a level of physical workload and change in time perception ratio. Also, a level of physical workload, in terms of a change in heart rate and Borg CR 10, could significantly predict a change in time perception ratio with value of 0.552 and 0.534, respectively. Conclusion: When participants performed a task with a higher level of physical workload, they tended to think that "time flew". Application: The result of this study can be applied to determine an appropriate amount of physical workload of a task to lower a discrepancy between a clock time and perceived time.
불편도 평가를 통한 마스크 타입 웨어러블 기기의 인간공학적 설계
양대용,정의승 대한인간공학회 2023 大韓人間工學會誌 Vol.42 No.1
Objective: This study investigated a perceived discomfort which can occur by the weight and loop type of a face mask type wearable device under simulated conditions. Background: Despite of a rapidly growing interest in face mask type wearable devices, most studies on a face mask have focused on a lightweight disposable mask while few studies have been conducted to evaluate an effect of their weight on a perceived discomfort. Method: The total of fifteen participants evaluated eight different face masks with four levels of weight and two types of loop. For each session, they were either seated or walking at a speed of 4km/h for thirty minutes while wearing a face mask with a certain weight. Then, they rated a level of discomfort on face, ear, and neck as well as overall discomfort every ten minutes. Results: The level of overall discomfort was significantly affected by all the experimental factors such as weight and loop type of a mask as well as activity and hours of use. Also, levels of discomfort on face, ear, and neck could significantly predict an overall discomfort with an adjusted R2 value of 0.917. It was also found that discomfort on face was the factor which had the strongest influence on an overall discomfort. Overall, the participants felt comfortable wearing a face mask with weight of up to 100g during 30 minutes of walking at a speed of 4km/h. Conclusion: Although weight of 150g for a face mask-type wearable device can be acceptable for certain people, its weight is recommended to be less than 100g with a head loop to be comfortably used in a daily life such as working in an office or walking outside. Application: The result of this study can be applied to determine an appropriate weight and loop type of a face mask type wearable device.
시멘트제법에 대한 우레탄 접착제의 품질 특성에 관한 연구
양대용,김운섭,이종석,김영채,김형진,문세기 한국산업경영시스템학회 1996 한국산업경영시스템학회지 Vol.19 No.38
According to the manual of shoemaking, the urethane adhesive for dress shoe applicable to the cementing process in KS G 3116 has been steadily developed. The evaluation test result of urethane adhesive, which is a mathematical model of men's shoe on shoemaking, is presented. Also, the quality test result of urethane adhesive, which is a list of experiment for field application and a model of assembling component in each unit process is introduced.