• Physical Therapy Korea
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• v.21 no.4
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• pp.15-22
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• 2014

The purpose of this study was to determine the muscle activities of the erector spinae (ES), gluteus maximus (Gmax), gluteus medius (Gmed), and the hamstring (HAM) and the ratios of Gmax/ES, Gmax/HAM, and Gmed/HAM during the prone heel squeeze (PHS) with different knee flexion angles ($45^{\circ}$, $90^{\circ}$, and $135^{\circ}$). Fifteen young and healthy subjects (8 men, 7 women) were recruited for the study. Surface electromyography signals were collected on ES, Gmax, Gmed, and HAM during PHS. A separate one-way analysis of variance with repeated measures was used to determine the significance of the muscle activities of ES, Gmax, Gmed, and HAM and the ratios of Gmax/ES, Gmax/HAM, and Gmed/HAM with different knee flexion angles during PHS. There was a significant increase in the Gmax activity at the knee flexion of $90^{\circ}$ in comparison with that of the $45^{\circ}$ (p=.016). There were significant increases in the Gmed activity at the knee flexion of $90^{\circ}$ (p=.008) and $135^{\circ}$ (p=.006) in comparison with that of the $45^{\circ}$. There were significant decreases in the HAM activity at the knee flexion of $90^{\circ}$ (p=.009) and $135^{\circ}$ (p=.004) in comparison with that of the $45^{\circ}$. There were significant increases in the Gmax/HAM muscle activity ratio at the knee flexion of $90^{\circ}$ (p=.007) and $135^{\circ}$ (p=.012) in comparison with that of the $45^{\circ}$. There were significant increase in the Gmed/HAM muscle activity ratio at the knee flexion of $135^{\circ}$ in comparison with that of the $45^{\circ}$ (p=.008). The knee flexion of $90^{\circ}$ during PHS can induce decreasing activity of HAM and increasing activity of Gmax, and the knee flexion of $135^{\circ}$ during PHS can induce decreasing activity of HAM and increasing activity of Gmed. Hence, PHS with different knee flexion positions could be considered for the different target muscle.

• Journal of Korea Entertainment Industry Association
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• v.14 no.8
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• pp.237-244
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• 2020

Sensory impairment is common following a stroke. Tactile afferent inputs from the plantar foot provide important information to the central nervous system to generate balance. The present study, which recruited 50 stroke patients, aims to determine the relationship between plantar tactile sensory threshold (PTST) and balance in patients with stroke. The PTST was evaluated at two sites (hallux and heel) using Semmes-Weinstein monofilaments. The balance abilities were measured by the degree of weight distribution in quiet standing (QS) and sitting-to-standing position (STS) using a MTD system and Berg balance scale (BBS). The hallux and heel sensory thresholds (ST) in the affected side were higher than the non-affected side (P < 0.05). The degree of weight distribution in the affected side was lower than the non-affected side. QS and STS showed P < 0.05, with BBS score of 36.00 ± 1.53. The hallux ST in the affected side correlated with BBS (r = -0.444, P < 0.05), QS (r = -0.332, P < 0.05), and STS (r = -0.390, P < 0.05), whereas the heel ST in the affected side correlated with BBS (r = -0.467, P < 0.05), QS (r = -0.532, P < 0.05), and STS (r = - 0.516, P < 0.05), suggesting that higher detected PTST might have an influence on the decreasing balance abilities. The study of sensory threshold in patients with stroke will help their rehabilitation and sensory evaluation.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.11a
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• pp.600-603
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• 2003

The floor thickness in residential buildings may not satisfy the floor vibration criteria even though the thickness is determined by the serviceability requirements in current design provisons. Thus it is necessary to develop the procedure to determine slab thickness that satisfies the floor vibration criteria. In this study provide the methods to determine the slab thickness that satisfies the vertical floor vibration criteria for several sizes of flat plate floor system. Randomness inherent in young modulus of concrete and heel drop intensity was accounted. For this purpose Monte Carlo simulation procedure was adopted.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.11a
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• pp.659-662
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• 2003

Recently, the floor thickness in residence may not be satisfied with the floor vibration criteria although the thickness is evaluated by the serviceability requirements in current design provisions. Thus it is necessary to develop the procedure to determine slab thickness satisfied with the floor vibration criteria. In this study, We proposed the methods to determine the slab thickness satisfied with the vertical floor vibration criteria for several concrete compressive strength of flat plate floor systems. For this purpose Monte Carlo simulation procedure was adopted and both randomness inherent in young modulus of concrete and heel drop intensity were accounted.

• 한국기계연구소 소보
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• s.15
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• pp.117-125
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• 1985

It is usual practice to ballast a sip to maintain requires operational safety at sea. However, excessive ballasting may reduce the operational economy of a ship. Therefore, The determination of the optimal location and quantity of ballast water is one of the important works at the preliminary design stage. To provide a convenient tool to ship designers the program for the determination of the optimal location and program the effect of the change of ballast water quantity in each tank on some characteristics of a ship, such as trim, initial stability and heel, is investigated and the minimum quantity of ballast water for each tank which satisfies the operational safety requirements is calculated.

• Journal of Korean Foot and Ankle Society
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• v.17 no.2
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• pp.84-92
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• 2013

Quite high prevalence of acute and chronic complications of calcaneal fractures has been reported. Acute complications include blisters, wound necrosis or infection. Late complications include subtalar arthritis, calcaneal malunion, lateral subfibular impingement, tendon problems, sural nerve complications. There are many surgical or nonsurgical treatment modalities to manage those complications. However strategic initial surgical approach with gentle soft tissue handling accompanied by comprehensive understanding about numerous complications might be the best tool to achieve pain free and functional heel after treating calcaneal fractures.

• 대한미세수술학회:학술대회논문집
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• 1994.11a
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• pp.100.2-101
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• 1994

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.220-220
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• 2017

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2003.03a
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• pp.267-274
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• 2003

The objective of this study is to estimate the frequency characteristics of group walking loads based on the information of measured responses. At first, dynamic properties such as natural frequencies and modes are obtained from input/output relation for building structures by heel drop test. Second, a method to estimate group walking loads by the transfer functions from measured responses to group walking loads is proposed. The method turned out to estimate the group walking loads accurately. Higher modes could be important in estimating the amplitude of group walking loads with the information of single walking load.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.23 no.54
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• pp.137-144
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• 2000

The chloroprene adhesive for ladies' shoe-making applied by the cementing method in KS G 3116 has been evaluated.. For the quality test of adhesive for pump whole cut vamp using chloroprene adhesive, general property and adhesion strength were measured and duration for environmental exposure was tested. Also, a list of experiments for field application was prepared. In case of adhesion-strength measurement,, the KS G 3116 method of peel strength at end of toe was found to be reasonable by measurement through a whole length, toe to heel seat on feather edge.