• Title/Summary/Keyword: Pressure Distribution

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The Effect of Pressure Distribution on the both Foots With Gluteus Medius Muscle Intensive Strengthening Exercise in 4Weeks. (4주간의 중간볼기근 중점 강화운동이 양쪽 발의 압력 분포에 미치는 영향)

  • Park, Sam-Ho;Park, Jong-Hang;Kim, Yoon-hwan
    • The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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    • v.24 no.1
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    • pp.67-75
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    • 2018
  • Background: The purpose of this study was to investigate the effect of pressure distribution on the both foots with gluteus medius muscle intensive strengthening exercise in 4week. Methods: The purpose of this study was to investigate the effect of gluteus medius muscles strengthening exercise on the pressure distribution of the foot in 20 healthy adults. Four gluteus medius muscles strengthening exercise programs were conducted three times a week for four weeks. The pressure distribution changed of the right and left foot parts of the experimental group and the control group were measured and analyzed. Results: There was a significant difference in F1, F2, M1, M2, and H1 among the pressure distribution of the right foot of the experimental group (p<.05). There was a significant difference in F1, M1, M2, H1 and H2 among the pressure distributions of the left foot of the experimental group (p<.05). There was a significant difference in H1 among the pressure distribution of the right foot of the control group (p<.05). There was no significant difference in the pressure distribution of the left foot region of the control group (p>.05). There was a significant difference in H1 among the pressure distribution of the right foot between the group (p<.05). There was a significant difference in M2, H1 among the pressure distribution of the left foot between the group (p<.05). Conclusions: In the healthy adults, it was confirmed that the application of the gluteus medius muscles strengthening exercise had an effect on the weight shift during the walking due to the overall foot balance and the pressure distribution change of the foot part.

A Study on the Characteristics of Pressure Distribution for Heat Exchanger Types of Domestic Gas Boiler (가정용 가스보일러 열교환기 유형에 따른 압력분포특성에 관한 연구)

  • 최경석;오율권;차경옥
    • Journal of the Korean Society of Safety
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    • v.16 no.4
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    • pp.22-28
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    • 2001
  • Heat transfer and pressure distribution for heat exchanger type of domestic gas boiler are different from shape, pitch, thickness of fin and array of pipe respectively. In order to measure the pressure distribution across the heat exchanger, a suction type wind tunnel was constructed and velocity distribution was measured for pilot tube(4 point) of rack type. The experiments were performed for 5 different air flow mass, rpm=3,6,9,12,15 and transverse axis of heat exchanger(x-length) is 5cm respectively. Results showed that above 9.5m/s, pressure distribution dispersion for wet type of heat exchanger is on the increase and above 5.5m/s, pressure distribution dispersion for dry type of heat exchanger is on the increase. Also, pressure distribution dispersion by comparing two different types heat exchanger, dry type of heat exchanger showed a higher augmentation than wet type of heat exchanger.

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Development of a Body Pressure Distribution Measuring Equipment for an Automobils Seat (자동차용 시트의 체압분포측정기 개발에 관한 연구)

  • Park, Se-Jin;Lee, Nahm-Sik;Kim, Chul-Jung;Lee, Soon-Yo
    • Journal of Korean Institute of Industrial Engineers
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    • v.19 no.3
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    • pp.113-121
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    • 1993
  • The pressure distribution between body and seat surface has been considered as one of the most important factors which affect seation comfort. The pattern of body pressure distribution has been an index of measuring comfort of an automobile seat. There has been numerous studies that measured the body pressure distribution. But, studies have many problems(pressure distortion, resolution, reliability, portability, usability, and shape fitness) in measuring the body pressure distribution. In this study, the new body pressure distribution measuring equipment has been developed by using the thin, flat, and polymer-film devices known as Force Sensing Resistors(FSRs) in order to solve those problems.

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COMPUTATION OF FREE-SURFACE FLOWS DUE TO PRESSURE DISTRIBUTION

  • Jack Asavanant;Montri Maleewong;Choi, Jeong-Whan
    • Communications of the Korean Mathematical Society
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    • v.16 no.1
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    • pp.137-152
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    • 2001
  • Steady two-dimensional flows due to an applied pressure distribution in water of finite depth are considered. Gravity is included in the dynamic boundary condition. Gravity is included in the dynamic boundary condition. The problem is solved numerically by using the boundary integral equation technique. It is shown that, for both supercritical and subcritical flows, solutions depend on three parameters: (i) the Froude number, (ii) the magnitude of applied pressure distribution, and (iii) the span length of pressure distribution. For supercritical flows, there exist up to two solutions corresponding to the same value of Froude number for positive pressures and a unique solution for negative pressures. For subcritical flows, there are solutions with waves behind the applied pressure distribution. As the Froude number decreases, these waves when the Froude numbers approach the critical values.

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Quantitative Evaluation of Driver's Postural Change and Lumbar Support Using Dynamic Body Pressure Distribution (동적 체압 분포를 이용한 운전 자세 변화와 요추지지대의 정량적 평가)

  • Na, Seok-Hui;Im, Seong-Hyeon;Jeong, Min-Geun
    • Journal of the Ergonomics Society of Korea
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    • v.22 no.3
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    • pp.57-73
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    • 2003
  • Although body pressure distribution is sensitive to movements and is relatively simple to measure even in small space, there are few researches involving applications to driver's posture and its change. The main objective in this study is the application of body pressure distribution measurements for the prediction of the driver's posture and its change. This requires quantitative analyses of the dynamic body pressure distribution, which is the change of body pressure distribution with time. The experiment involved 16 male subjects who drove for 45 minutes in a seating buck. Measurement time, stature group, and lumbar support prominence were selected as independent variables, with subjective ratings of driver's discomfort, body posture data of hip, torso. knee angle, and body pressure data variables as dependent variables. The body pressure change variables and subjective ratings were found to increase as the measurement time increased and body pressure ratio variables reflected the torso angle. From the results and analysis of the body posture data and subjective rating results, it was predicted that the seats and the design of the lumbar supports used in the experiment was not fit for tall subjects, which could also be confirmed through the body pressure distribution data.

Study on Relationship between Discomfort and Body Pressure Distribution on the Seat under Height of Footrest and Angle of Seatpan (발판 높이와 의자밑판 각도에 따른 체압분포 변화와 불편함의 상관성 평가)

  • Park, Dong-Woon;Ahn, Se-Jin;Yoo, Wan-Suk
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.6
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    • pp.38-43
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    • 2007
  • In this paper, a study is described on finding a relationship between discomfort and body pressure distribution. In the first step, experiments were conducted to find correlation between pressure distribution and discomfort. The experiments of 12 people on 9 seats were performed. In the second step, parameters and correlation coefficients were determined between the measured body pressure distribution and median values of the subjective evaluations of 12 subjects using psychophysical power law.

Evaluation of spatial pressure distribution during ice-structure interaction using pressure indicating film

  • Kim, Hyunwook;Ulan-Kvitberg, Christopher;Daley, Claude
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.6 no.3
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    • pp.578-597
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    • 2014
  • Understanding of 'spatial' pressure distribution is required to determine design loads on local structures, such as plating and framing. However, obtaining a practical 'spatial' pressure distribution is a hard task due to the sensitivity of the data acquisition frequency and resolution. High-resolution Pessure-Idicating Flm (PIF) was applied to obtain pressure distribution and pressure magnitude using stepped crushing method. Different types of PIF were stacked at each test to creating a pressure distribution plot at specific time steps. Two different concepts of plotting 'spatial' pressure-area curve was introduced and evaluated. Diverse unit pixel size was chosen to investigate the effect of the resolution in data analysis. Activated area was not significantly affected by unit pixel size; however, total force was highly sensitive.

Plantar Pressure Distribution Characteristics of Hallux Valgus (엄지 발가락외반증환자의 발바닥 압력분포 특성)

  • 김영호;박시복;양길태;임송학;이강목;문무성
    • Journal of Biomedical Engineering Research
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    • v.18 no.4
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    • pp.439-446
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    • 1997
  • We undertook this study to determine the plantar pressure distribution characteristics of hallux valgus, major increasing foot disease. Twenty three valgus Patients were evaluated with clinical examinations, radiologic studies and dynamic plantar pressure distribution measurements. The present study also suggested a masking method for detailed analyses on plantar pressure distribution measurements. With higher grade of hallux valgus, pressure, contact area, and impulse on metartasus are significantly increased Pressure concentration is very important in foot diseases and an approximate plantar pressure distribution should be considered on any shoe design.

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Analyses of GRF & Insole Foot-Pressure Distribution: Gait Patterns and Types of Trekking Boots (등산화의 종류와 보행동작에 따른 지면반력 및 족저압력 분석)

  • Park, Seung-Bum;Lee, Joong-Sook
    • Korean Journal of Sport Biomechanics
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    • v.17 no.4
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    • pp.191-200
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    • 2007
  • The purpose of this study was to analyze the foot-pressure distribution of trekking boots for assessing their functionality. Subjects participated in this study included 10 university male students who had no injury experience in lower limbs and a normal gait pattern. The size of all subjects was 270mm. Five models of trekking boots, most popular in Korea (A, B, C, D & E company), were selected for the test. Using the PEDAR-X system and PEDAR-X insoles, 5 different walking stages were analyzed for the foot-pressure distribution: (a) straight gait; (b) $45^{\circ}$ turn gait; (c) $25^{\circ}$ uphill gait; and (d) $25^{\circ}$ downhill gait. Results of the foot-pressure distribution and functionality on each stage were as follow; 1. Straight gait - In case of Max ground reaction force, mean plantar pressure and Max plantar pressure, there was not a distinct tendency; however, products manufactured by E and A company showed relatively lower pressure distribution. 2. $45^{\circ}$ turn gait - In Max ground reaction force, mean plantar pressure and Max plantar pressure, there wasn't a distinct tendency; however, products manufactured by E and A company showed relatively lower pressure distribution. Results also revealed that the products manufactured by E and A company were superior to those by other companies in terms of functionality. 3. $25^{\circ}$ uphill gait - In Max ground reaction force, mean plantar pressure and Max plantar pressure, there wasn't a distinct tendency; however, products manufactured by E and C company showed relatively lower pressure distribution. Results also revealed that the products manufactured by E and C company were superior to those by other companies in terms of functionality. 4. $25^{\circ}$ downhill gait - In Max ground reaction force, Mean plantar pressure and Max plantar pressure, there wasn't a distinct tendency; however, products manufactured by E company showed relatively lower pressure distribution. Results also revealed that the products manufactured by E company were superior to those by other companies in terms of functionality. Overall, five pairs of trekking shoes selected in this study showed the excellent performance in several conditions. The findings above may provide us with the important criteria for choosing trekking boots.

The Comparison of Plantar Pressure Distribution regarding the Extent of Hemineglect in Adult Hemiplegia (성인 편마비 환자의 편측 무시정도에 따른 족저압 비교)

  • Cha, Yong-Jun;Kim, Kyung
    • Journal of the Korean Society of Physical Medicine
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    • v.5 no.1
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    • pp.43-51
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    • 2010
  • Purpose : The purpose of this study was to compare plantar pressure distribution between affected side and unaffected side and to analyze plantar pressure distribution of affected side according to the extent of hemineglect in the adult hemiplegia. Methods : Twenty-five hemiplegia participated in this study. The analysis of plantar pressure distribution was conducted by the F-scan system, and the extent of hemineglect was evaluated with line-bisection test. While the subject walked about 10 meters in their comfortable speed the plantar pressure was evaluated and stored. Results : Total contact area, AP CoP trajectory, contact pressure of mid-foot of the affected side were significantly different from the unaffected side. Total contact area, AP CoP trajectory and contact pressure of mid-foot were smaller than those of unaffected side. In the comparison among the group according to the extent of hemineglect, AP CoP trajectory of subject who has severe hemineglect was significantly different from the patient that has no hemineglect and it was shorter than that of no hemineglect. Conclusion : The plantar pressure distribution was generally different between affected side and unaffected side and the hemineglect affected negatively the patient to move CoP forwardly while walking. Accordingly, it will help the clinician to understand the hemineglect which has an effect on abnormal walking and to intervent the hemiplegia who has a neglection to the affected side.