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Low-Cost Automatic Screw Machine Using a Commercial Electric Screwdriver
Joo-Yeon Hwang,Doo-Hee Jung,Young-Jun Roh,Kee-Jun Nam,Dal-Yeon Hwang 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
This paper proposes low-cost automatic screw machine using a commercial manual electric screwdriver. The proposed system is designed for measuring torque and Z-axis force while fastening the screw using an electric screwdriver. Based on the spindle structure, magneto-resistive sensor is used for measuring the torque. The potentiometer on the shaft structure is used for measuring the force. The controller board collects all sensed data and sends them to PC. All sensed data is analyzed on the PC and success or failure is determined for screw fastener. The practicality of the proposed system is verified through extensive tests of collecting and analyzing data.
Ji-Eun Cho;Dal-Yeon Hwang:Joohee Hahn;Wan-Hee Lee 물리치료재활과학회 2018 Physical therapy rehabilitation science Vol.7 No.3
Objective: To determine if the provision of visual biofeedback using real-time rehabilitative ultrasound imaging (RUSI) enhances the acquisition and retention of diaphragm muscle recruitment during exercise. Design: Two group pretest posttest design. Methods: Thirty healthy subjects were randomly assigned to the verbal feedback group (VG, n=15) or the visual and verbal feedback group (VVG, n=15). The VG performed breathing exercises 10 times with verbal feedback, and the VVG also performed breathing exercises 10 times with verbal feedback and visual feedback with the use of RUSI to measure changes in diaphragm thickness (DT). For DT, the mid-axillary lines between ribs 8 and 9 on both sides were measured in standing, and then the chest wall was perpendicularly illuminated using a linear transducer with the patients in supine to observe the region between rib 8 and 9 and to obtain 2-dimensional images. DT was measured as the distance between the two parallel lines that appeared bright in the middle of the pleura and the peritoneum. After one week, three repetitions (follow-up session) were performed to confirm retention effects. Intra- and between- group percent changes in diaphragm muscle thickness were assessed. Results: In the VVG, the intervention value had a medium effect size compared to the baseline value, but the follow-up value decreased to a small effect size. In the between-group comparisons, during the intervention session, the VVG showed no significant effect on percent change of DT but had a medium effect size compared to the VG (p=0.050, Cohen’s d=0.764). During the follow-up session, retention effect did not persist (p=0.311, Cohen’s d=0.381). Conclusions: RUSI can be used to provide visual biofeedback and improve performance and retention in the ability to activate the diaphragm muscle in healthy subjects. Future research needs to establish a protocol for respiratory intervention to maintain the effect of diaphragmatic breathing training using RUSI with visual feedback.
Measurement of PM10 Concentration in One Dental Clinic
Su-Yeon Hwang,Dal-Nim Yang,권하정,Joo-Young Lee 대한예방치과학회 2014 International Journal of Clinical Preventive Denti Vol.10 No.4
Objective: This study was performed to investigate the particular matter of indoor air quality in dental clinic based on the legallyPM10 concentration indoor reference value 100 μm/m3, and the result will be presented to the regulation andmanagement. Methods: This study is aimed to investigate the indoor air quality in the waiting room and treatment office, using theDustmate for 7 hours, which had been set to work every 2 minutes an hour. The treatment office where dental personnelstays for a long period of time was measured, using the Dustmate for 24 hours, which had been set to work every 30 minutesan hour. Results: The dental institution measurement for each location, the 2 multiuse facilities didn't exceed the Standard Act criteria100 μm/m3. As a result of natural ventilation (morning treatment) and after the natural ventilation (afternoon treatment) by usingnatural ventilator during the lunch time, the standard concentration of PM10 has been reduced. After comparing thePM10 of treatment office and outdoor for 24 hours, both didn't exceed the indoor air quality standard level. Conclusion: The dental personnel needs to clean the dental clinic regularly, and it is required to systematically manage byregular cleaning, and the installing an air purifier. An appropriate response plan needs to be considered for the dustproblems.
Ki-hyeon Kim,Dal-Yeon Hwang,Wan-hee Lee 물리치료재활과학회 2023 Physical therapy rehabilitation science Vol.12 No.4
Objective: This study compared the effect of lower limb function, balance and gait between robot-assisted gait training with andwithout rhythmic auditory stimulation (RAS) in hemiplegic stroke patients. Design: Randomized controlled trial. Methods: Thirty-one strokepatients were randomly divided to robot-assisted gait training with RAS (RGTR) group (n=15) andcontrol group (n=16). Both groups undergone robot-assisted gait training and conservative exercise therapy for 30 minutes each,five times a week, for 4 weeks. The RGTR group additionally received RAS during the robot-assisted gait training. To analyze theeffect of the training, Lower limb function was Fugl-Meyer assessment lower extremity, balance ability was stability index andBerg balance scale, and Gait ability was using gait parameters obtained using a gait analyzer (Zebris FDM-T system) were measured. Results: According to the training, the RGTR group showed of increased significantly in lower limb function, balance, and gaitability in the within-group before-after difference (p<0.05).In the between-group difference comparison, the RGTR group were significantly better improvements in the Berg balance scale of balance ability and among gait ability, all gait parameters except forcadence than the control group (p<0.05). Conclusions: Thisstudy offer that robot-assisted gait training with RAS in performed together with conservative exercise therapyis an effective training method of improving balance and gait ability in hemiplegic stroke patients.