• 대한인간공학회지
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• 제31권6호
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• pp.725-731
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• 2012

Objective: The aim of this study is to investigate visual feedback effects and human performance in the foot mouse control. Background: Generally, computer mouse tasks are controlled by visual feedback. In order to understand the characteristics of a foot mouse control, it is important to investigate the patterns of visual feedback involved in foot-mouse control tasks. Human performance of foot mouse control is also an important factor to understand the foot mouse control. Method: Three types of mouse control were determined to investigate visual feedback effects and human performance in the foot mouse control. Visual feedback effects in the foot mouse control were compared with those of a typical hand mouse. The cursor movement speed and mental workload were measured in the three types of tasks and two types of mouses. Results: Mouse control tasks with an element of homing-in to the target were more quickly performed by the hand mouse than the foot mouse. Mental workload was also higher in the foot mouse than the hand mouse. However, in the steering movement, human performance of the foot mouse control was not lower than that of the hand mouse control. Visual feedback in the foot mouse control was less required than in the hand mouse control. Conclusion: The foot mouse was not efficient in the most mouse control tasks, compared to the hand mouse. However, the foot mouse was efficient in the steering movement, moving a cursor within a path with lateral constraints. Application: The results of this study might help to develop the foot mouse.

• 대한인간공학회지
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• 제35권3호
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• pp.175-184
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• 2016

Objective: In this study, two types of foot-controlled mouse devices are compared with a hand mouse in the input tasks requiring repetitively switching between a keyboard and a mouse. Background: Foot-controlled mouse devices have been developed for persons with impairments in the mobility of their hands. However, some researchers insisted that the foot-controlled mouse devices could be effectively used by the persons with no limits to their hand mobility. There are needs to investigate the efficiency of the foot-controlled mouse devices, when they are used by the nondisabled people. Method: Participants conducted the input tasks, requiring repetitive switches between a keyboard and a computer mouse. The used computer mouse devices were two types of foot-controlled mouse and a typical hand mouse. Participants performed three types of input task for five days and three types of task performance were measured; the number of completed input tasks within a given practice time, subjective satisfaction level and the time wasted for the mouse control. Results: For five days, the performance of input tasks sharply increased in input tasks by foot-controlled mouse devices rather than a hand mouse. After five days, the level of satisfaction on the foot-controlled mouse devices approached to about 76% of a hand mouse satisfaction level. The control time of the foot-controlled mouse devices also approached to about 109% of a hand mouse control time. Conclusion: After only five-day practice, the input task performance by foot-controlled mouse devices approached to that of a hand mouse. This result may suggest that the foot-controlled mouse devices can be effectively used as an alternative input device for the nondisabled people, if input tasks are easy and enough practice time is provided. Application: The results of this study might help to design foot-controlled mouse devices and to expend the usage of them.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.474-474
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• 2000

This paper shows that a system with two-link arm can obtain hand reaching movement to a target object projected on a visual sensor by reinforcement learning using a layered neural network. The reinforcement signal, which is an only signal from the environment, is given to the system only when the hand reaches the target object. The neural network computes two joint torques from visual sensory signals, joint angles, and joint angular velocities considering the urn dynamics. It is known that the trajectory of the voluntary movement o( human hand reaching is almost straight, and the hand velocity changes like bell-shape. Although there are some exceptions, the properties of the trajectories obtained by the reinforcement learning are somewhat similar to the experimental result of the human hand reaching movement.

• 지역사회간호학회지
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• 제22권2호
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• pp.100-110
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• 2011

Purpose: The purpose of this study was to evaluate the effects of hand moxa and hand press pellet on blood pressure, blood lipids and blood cell components in elderly women. Methods: This study was conducted as a quasi-experiment with none equivalent control group pre-post test design. The participants were elders who had essential hypertension. There were 18 members in the experimental group and 20 members in the control group. The experimental group received hand moxibustion and hand press pellet 3 times a week for 12 weeks. The results were analyzed using $x^2$ test, t-test, Fisher's exact test and repeated measures ANOVA with the SPSS/WIN program. Results: There were significant decreases in blood pressure in the experimental group compared to the control group. No significant difference was observed in total triglyceride, LDL cholesterol and HDL cholesterol between the two groups. Differences in hemoglobin and hematocrit were not significant either. However, there were significant increases in RBC in the experimental group after the intervention. Conclusion: The results suggest that combined hand therapy contributes to the decrease of blood pressure among the elderly with hypertension. Therefore combined hand therapy is recommended as a complementary nursing intervention strategy for the elderly with essential hypertension.

• 한국학교보건학회지
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• 제27권1호
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• pp.39-49
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• 2014

Purpose: The purpose of this study was to investigate the effect of hand washing education programs on knowledge, attitude and performance of hand washing in Undergraduates. Methods: The study used a nonequivalent control group quasi-experimental design. A total of 118 students in K university in Seoul, Korea, participated in this study. 67 students were included in the experimental group and 51 students were in the control group. The experimental group was given a lecture, Educational Hand Washing Program, developed by researchers. Using a structural questionnaire, the students' perception on hand washing was measured before and after the intervention, in terms of knowledge, attitude, and performance at home and school. Results: The experimental group showed significantly higher scores in knowledge (p=.033), attitude (p<.001), and performance at home (p=.001). However, the performance at school didn't show a significant difference between the two groups (p=.063). Conclusion: The results indicate that education is effective in enhancing knowledge, attitude, and performance of hand washing.

• 제어로봇시스템학회논문지
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• 제8권7호
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• pp.599-606
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• 2002

A new method to govern the navigation of a mobile robot using hand gesture recognition is proposed based on the following two procedures. One is to achieve vision information by using a 2-DOF camera as a communicating medium between a man and a mobile robot and the other is to analyze and to control the mobile robot according to the recognized hand gesture commands. In the previous researches, mobile robots are passively to move through landmarks, beacons, etc. In this paper, to incorporate various changes of situation, a new control system that manages the dynamical navigation of mobile robot is proposed. Moreover, without any generally used expensive equipments or complex algorithms for hand gesture recognition, a reliable hand gesture recognition system is efficiently implemented to convey the human commands to the mobile robot with a few constraints.

• 보건의료산업학회지
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• 제13권2호
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• pp.121-133
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• 2019

Objectives: The purpose of this study was to determine the effectiveness of hand acupressure in relieving shoulder pain among male manufacturing workers. Methods: A nonequivalent control group was employed using a nonsynchronized design. Data were collected from two manufacturing plants located in metropolitan area U. The data were analyzed with a ${\chi}^2$-test and an independent t-test to perform a homogeneity test, and with repeated ANOVA measures to perform an hypothesis test using the SPSS 21.0 program. Results: Hypothesis 1 that "the experimental group provided with hand moxibustion would score lower for low shoulder pain than the control group" was supported (F=306.05, p<.001). Hypothesis 2, that "the experimental group provided with hand moxibustion would have a wider range of motion than the control group" was also supported with increased flexion(F=7.73, p<.001), extension(F=7.89, p=.001), abduction(F=21.23, p<.001), and horizontal abduction(F=20.89, p=.028). Hypothesis 3, that "the experimental group provided with hand moxibustion would score lower for quality of sleep than the control group" was not supported (F=56.10, p=.091). Conclusions: Hand moxibustion is effective in relieving shoulder pain for male manufacturing workers, in relieving low shoulder pain and increasing the range of motion.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.276-280
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• 1993

An articulated, multifinger mechanical hand can carry out grasping and manipulation operations on objects of different type and shape. In this paper the architecture of the mechanical hand is presented. Joints are driven by two antagonist tendons. Strain gauges are used to derive tendon tensions, and located in the palm of the hand. Angular defection of the joints is measured by Hall effect sensors attached to the joints. A multiprocessor-based architecture for controlling the hand is illustrated.

• 한국게임학회 논문지
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• 제16권6호
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• pp.49-58
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• 2016

본 논문에서는 1인칭 시점 모바일 게임에서 사용 가능한 세 종류의 한 손 조작 방식들을 제안하고 이들을 평가한다. 기존의 모바일 게임들은 화면에 가상 컨트롤러를 디스플레이하여 사용자에게 양손으로 조작하도록 하는 방식을 많이 사용하고 있다. 1인칭 시점 모바일 게임의 경우, 시점 이동을 위해 필요한 기능들이 적기 때문에 한 손을 이용한 조작 방식이 가능하다. 본 논문은 1인칭 시점 이동과 회전을 위한 세 종류의 한 손 조작 방식을 제안하고, AHP 방법으로 평가한다. 실험을 통해, 1인칭 시점 모바일 게임의 경우에는 양손 조작 방식보다 한 손 조작 방식이 사용자에게 유용함을 증명한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 추계학술대회논문집
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• pp.1038-1042
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• 2003

In order to evaluate dynamic impedance of a hand-arm system it is necessary to measure the hand-transmitted vibration and the reaction force at the same time while gripping the vibrating handle. In the study a device was developed to measure both the vibration and the force. The device consists of a measurement handle with four strain gauge and two accelerometers and a PC based control system with a program for the signal processing and evaluation of the hand-transmitted vibration and reaction force. The handle was installed on the vibration shaker so that it can move by the generated signal from the control system. As an application of the system dynamic reaction force and the frequency weighted acceleration at the handle attached to the shaker were measured at various grip force and feed force. This system will be very useful in the area of impedance measurement and the evaluation of performance of anti-vibration gloves.