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The Effects of Visual and Haptic Vertical Stimulation on Standing Balance in Stroke Patients
홍석하,임선,박근영 대한재활의학회 2013 Annals of Rehabilitation Medicine Vol.37 No.6
Objective To explore the effect of visual and haptic vertical stimulation on standing balance in post-stroke patients.Methods Twenty-five post-stroke patients were recruited. We measured left/right standing pressure differences and the center of pressure (COP) parameters for each patient under three different conditions: no stimulation, visual, and haptic stimulated conditions. First, patients stood on a posturography platform with their eyes blindfolded. After a rest period, the patients stood on the same platform with their eyes fixed to a 1.5-m luminous rod, which was placed at a vertical position in front of the patients. After another rest period, the patients again stood touching a vertically placed long rod in their non-hemiplegic hand with their eyes blindfolded. We collected the signals from the feet in each condition and obtained the balance indices.Results Compared with the no stimulation condition, significant improvements were observed for most of the COP parameters including COP area, length, and velocity for both the visual and haptic vertical stimulation conditions (p<0.01). Additionally, when we compared visual and haptic vertical stimulation, visual vertical stimulation was superior to haptic stimulation for all COP parameters (p<0.01). Left/right standing pressure differences, increased, although patients bore more weight on their paretic side when vertical stimulation was applied (p>0.01). Conclusion Both visual and haptic vertical stimulation improved standing steadiness of post-stroke patients. Notably, visual vertical stimulation was more effective than haptic stimulation.
홍석하 ( Suk Ha Hong ),손기상 ( Ki Sang Son ) 대한설비관리학회 2015 대한설비관리학회지 Vol.20 No.3
This is to study how to provide incentives to establish emotional safety at construction sites. These incentive related items such as self wearing safety equipment, PPE condition, suitability of safety facilities, satisfaction level for safety facilities, TBM efficiency, need of safety training, work improvement due to emotional safety incentive, consciousness improvement due to emotional safety incentive, work satisfaction, satisfaction of welfare facilities, communication satisfaction are analyzed to find out correlation level with R-square and confidence level, statistically. Many items as of incentives which construction engineers consider have been provided at construction sites, subjectively. But It is shown that most of them could not be contributed to establishing efficient safety emotionally, different from what most people have thought so far. Practically needed activities for emotional safety are shown in this study. It is also found out that new policy for establishing emotional safety should be made and provided at construction sites.
The Proximity Communication을 위한 서브펨토-패러드 커패시턴스 측정회로
홍석하(Seok-Ha Hong),신민석(Min-Seok Shin),권오경(Oh-Kyong Kwon) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
A new circuit to measure a subfemto-farad coupling capacitance is proposed. This circuit converts current by coupling signal into amplified voltage. This circuit consists of cascode current mirror and trans impedance amplifier to improve the measurement resolution. Simulation results are obtained by HSPICE in a 0.35㎛ CMOS standard technology. When 300 atto-farad capacitance is measured, the maximum error rate is 2.27%.
박주혜,오은재,박혜정,홍석하,이종인 대한재활의학회 2013 Annals of Rehabilitation Medicine Vol.37 No.4
Postpartum sacral fracture is relatively rare, and its diagnosis is often delayed. We herein report such a case of a 28-year-old patient who presented with an insidious-onset lower back pain, left buttock pain, and radicular symptoms mimicking lumbar radiculopathy. Laboratory tests showed a decreased 25-hydroxy vitamin D level, and the bone mineral densitometry of both femurs was below the expected range. Plain radiographs of the lumbar spine and pelvis showed no definite abnormality, but lumbosacral spinal magnetic resonance imaging identified a left sacral fracture. Symptoms were alleviated with rest and oral analgesic treatment.