• Title/Summary/Keyword: movement of balance

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An Experimental Study on Combustion Characteristics of Radiant Burner (복사 버너의 연소특성에 관한 실험적 연구)

  • Wie, Jae-Hyug;Lee, Dae-Rae;Kim, Young-Soo;Jeon, Chung-Hwan
    • 한국연소학회:학술대회논문집
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    • 2006.04a
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    • pp.19-25
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    • 2006
  • Energy efficient and low pollution combustion systems the use gaseous fuels have been in great demand in recent year. Radiant burner in many different forms are emerging as very desirable combustion systems for same reason. Porous radiant burners are used in drying, preheating and curing, and in other type of materials processing and manufacturing processes. However, little knowledge is available about the operating characteristics and the structure of flames in porous ceramic fiber radiant burners. The objective of the present work is to investigate the global performance characteristics of the ceramic fiber burner. A detailed study which includes the spectral intensity, gas temperature, radiation efficiency and global pollutant emissions. Another objective is to study the flame structure of the ceramic fiber burner by measuring the local gas temperature. The results indicate that ceramic fiber burner do offer a 19-44% gain in radiant efficiency. The ceramic fiber burner exhibit significant spectral intensity peaks in the band at $2.0-2.5{\mu}m$. The local temperature distribution inside the mat and near the mat surface as a function of the equivalence ratio can be reasonably interpreted by the relation of the heat balance in the mat and movement of the reaction zone. Nox emission from ceramic fiber burner is less than 25ppm throughout the operating range.

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The Comparison of Plantar Pressure on Double Limb Support and Single Limb Support according to Soft Surface (연성면에 따른 양발지지와 한발지지 시 족저압 비교)

  • Lee, Jeon-Hyeong;Chung, Hyeung-Jae;Kim, Shin-Gyun
    • PNF and Movement
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    • v.11 no.2
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    • pp.95-102
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    • 2013
  • Purpose : The purpose of this study was to investigate a plantar pressure distribution and the trajectory of the center of pressure on double limb support and single limb support according to level surface, air cushion, and aero step. Methods : 21 healthy adults participated in this study. The plantar pressure were assessed at three different surface conditions(on the level surface, air cushion, and aero step) on double limb support and single limb support. Testing orders were selected randomly. Results : Plantar pressure distribution show a significant difference contact area 1 and contact area 3 on double limb support and single limb support. The trajectory of the center of pressure show an significant difference anteroposterior(AP), mediolateral(ML), and total displacement on double limb support and single limb support. Conclusion : Through the use of soft surface as air cushion and aero step will be using the ankle strategy. This will be to strengthen the muscles around the ankle. Consequently, should help to improve stability and coordination.

Review of Various Treatments Applied to Patients with Chronic Low Back Pain (만성 요통환자들에게 적용하는 다양한 치료법들에 대한 고찰)

  • Ma, Sang-Yeol;Kim, Eun-Mi;Kim, Hye Lee;Lee, Jae-Hong
    • PNF and Movement
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    • v.10 no.2
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    • pp.47-54
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    • 2012
  • Purpose : The purpose of this study was investigated to find the approach in the various method for patients with chronic low back pain. Methods : For research purposes that meet the search was focused papers. Treatments include PNF, chiropractic, joint mobilization, microcurrent, electroacupuncture, stabilizing exercise, resistance exercise, aquatic rehabilitation exercise, lumbar flexion and extension exercise were included as Gymball exercise. Results : Treatment with the three major manual therapy, electrical therapy and therapeutic exercise were divided. The result of applying manual therapy increased balance, increased strength, stability increased and decreased pain. The result of applying the electrical therapy increased flexibility, and decreased pain. The result of applying therapeutic exercise increases muscle strength, reduced pain, and decreased body fat. Conclusion : Previous studies by examining the effects of chronic low back pain treatment was intended to help in the selection and application Aquatic therapy, manual therapy, electrical therapy for patients with chronic low back pain with pain reduction was found to be effective.

Relationship of Cognitive Functions and Physical Activities in Persons with Chronic Stroke

  • Woo, Young-Keun;Hwang, Su-Jin
    • PNF and Movement
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    • v.10 no.4
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    • pp.1-7
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    • 2012
  • Purpose : The purpose of this study was to evaluate the relationship between physical performance, such as gait and postural control, and cognition on as assessed by clinical tools in individuals with chronic hemiparetic stroke. Methods : Twenty-six patients who had hemiparetic stroke participated in this study, and were evaluated four common clinical measurements, including the Berg balance scale (BBS), 10 meter walk test (10MWT), 6 minute walking test (6MWT), and Montreal cognitive assessment (MoCA). Multiple regression analysis was used BBS score, 10MWT, and 6MWT as the dependent variables; MoCA score, post-stroke duration, age, and affected side as independent variables. Results : In the regression equation of the BBS score, the correlation coefficient (r) was 0.875, the coefficient of determination (R2) was 0.786, and the MoCA score was the most important variable for determining the BBS score. In the regression equation for the 10MWT, ther was 0.888, the R2 was 0.999, and the MoCA score was the most important variable for determining 10MWT. Finally, the r was 0.777, the R2 was 0.998, and the MoCA score was the most important variable for determining 6MWT in the regression equation of the 6MWT. Conclusion : The results show that cognitive abilities affect gait proficiencies in individuals with chronic hemiparetic stroke. Therefore, these results suggest that cognitive tests are necessary for examining and evaluating the abilities of postural control and gait performance for chronic stroke patients in research and clinical environments.

A Comparative Study between the Effects of Proprioceptive Neuromuscular Facilitation Stretching and Passive Stretching on Weight Distribution and Flexibility for Trunk Flexion (고유수용성 신경근 촉진법 신장기법과 정적 신장기법이 몸통 굽힘의 유연성과 체중분포에 미치는 효과 비교연구)

  • Kim, Jwa-Jun;Park, Se-Yeon
    • PNF and Movement
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    • v.16 no.3
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    • pp.345-353
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    • 2018
  • Purpose: The purpose of the present study was to compare the effects of proprioceptive neuromuscular facilitation (PNF) and static stretching on weight distribution and flexibility for trunk flexion. Method: Sixty participants who had no musculoskeletal disorders were recruited from a local university within six months of this study. The participants were randomly assigned to a PNF stretching group (N=30) and a static stretching group (N=32). For the pre-and post-measurement design, the left-right weight distribution, anterior-posterior weight distribution, and finger-to-floor distance (FFD) were measured before and after the stretching interventions. Result: The FFD results were significantly improved after the interventions, regardless of the group differentiation (p<0.05). The PNF stretching intervention significantly increased the differences between anterior and posterior weight distribution compared to the static stretching group (p<0.05). Conclusions: Both the PNF and static stretching interventions could improve flexibility for trunk flexion mobility. Although the PNF intervention improved the weight distribution in the anterior-posterior direction, further research is required to investigate the various PNF interventions on left-and-right and anterior-posterior weight distribution.

A Study on Resistance Spot Welding of Dissimilar Sheet Metals(Aluminum Alloy - Steel Sheets) (이종재료(알루미늄합금-강판)의 저항 점용접에 관한 연구)

  • 손병천;우승엽;이재범;최용범;장희석
    • Journal of Welding and Joining
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    • v.15 no.4
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    • pp.42-62
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    • 1997
  • Resistance spot welding has been widely used in the sheet metal joining processes because of its high productivity and convenience. Recently, automobile industries are trying to replace partly steel sheets with aluminum alloy sheets. Among currently produced aluminum alloys, Al alloy sheets of Al-Mg-Si(6000 series) are being tested. Especially, 6000 series are the most probable substitute in view of strength and weldability. In this paper, an attempt was made to apply resistance spot welding to joining of dissimilar sheet metals (KS6383+SCPZn or KS6383+SHCP). An effort was made to balance heating rate in the Al alloy with that in the steel sheets by increasing electrode tip diameter. Although resistance spot welding of Al alloy sheet and sheet metals does not produce desirable nugget, it proved to have reasonable strength if optimal weld condition is found by tensile-shear strength and fatigue life test. Since spot weld joints in automobile are always experiencing repeated load, spot welding methodology proposed in this paper is found to be not suitable to automobile body manufacturing.

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Theoretical study on the particle contamination in silane plasma reactor for semiconductor processing (반도체 제조용 사일렌 플라즈마 반응기 내에서의 입자 오염에 관한 이론적 연구)

  • 김동주;김교선
    • Journal of the Korean Vacuum Society
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    • v.9 no.2
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    • pp.172-178
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    • 2000
  • We developed the model equations to investigate the particle movement and growth theoretically in a-Si plasma CVD reactor, where those particles act as the source of contamination. We included the effects of fluid convection, particle diffusion and external forces (ion drag force, electrostatic force and gravitational force) onto the particles to analyze the movements of particles in plasma reactor. Taking into account the particle charge distribution, the particle growth by coagulation between the charged particles was investigated. Most of those particles are located in the region near the sheath boundaries by the balance between the ion drag and electrostatic forces. The particle concentrations in the sheath region and in the bulk plasma region are almost zero. The sizes of the predator particles increase with time by the coagulation with protoparticles and, as a result, the surface area and the average charge of predator particles also increase with time.

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CONSTRUCTION PROCEDURE OF TOOTH POSITIONER (Tooth Positioner의 제작에 관해서)

  • Kyung, Hee Moon;Sung, Jae Hyun
    • The korean journal of orthodontics
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    • v.12 no.1
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    • pp.61-68
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    • 1982
  • Tooth Positioner는 band를 제거한 후 가능한 빨리 장착시켜야 susceptible하며 무엇보다도 환자의 생리학적 jaw movement를 설정해서 제작해야 하고 적어도 hingeaxis relation은 찾아서 제작해야한다. Positioner의 장착시간은 하루에 $3\~4$시간의 active biting exercise와 수안시간동안 사용하게 한다. 처음 장착시에 가장 tight하고 이 tightness 는 치아가 요망되는 위치로 근접함에 따라서 점차 감소되고 이 tightness의 감소가 작용효과의 가장 좋은 지침이 되며 자는 하루 하루 그 변화를 느껴야 한다. Positioner가 느슨하게 적합되고 좋은 교합관계를 보이면 장착을 수안시간동안으로 제한시키거나 혹은 깨어 있을 동안 한 두시간 장착하게 한아. 대개 $3\~4$주 후에 predetermined pattern과 유사하게 되며, 일반적으로 장착 후 $8\~10$주 후에 더 장착할 것인가를 결정하고 필요성이 없다면 conventional retainer로 바꾸어 준다. Tooth Positioner는 기능적인 구호흡, thumb sucking, snoring을 해소시켜 줄 수 있으며 jaw relationship이나 overbite문제를 해결할 수 있다. 그리고 chair time을 감소시켜 줄 수 있으며 tissue tone을 자극해서 치아위치를 증진시키는데 끊임없이 작용한다. 그러나 제작에 많은 시간이 걸리고 치아를 배열하는 술자의 능력에 따라 치료효과가 많이 좌우되며 너무 bulky하므로 이물감이 커서 유용하게 장착할 수 있는 시간이 제한적이고 natural muscle balance에 대해 간헐적인 교정력을 가함으로써 치아를 loosening 시킬 수 있다. 이 장치물은 다른 removable appliance와 같이 환자의 협조가 무엇보다 중요하므로 환자에게 장착동기를 유발시켜 주는 것이 좋으며 True Blocked Nasal Airway가 있는 환자에게는 금기증이 된다.

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Imperceptible On-Skin Sensor Devices for Musculoskeletal Monitoring and Rehabilitation (상시 근골격 모니터링과 재활을 위한 온스킨 센서 디바이스 기술)

  • Park, C.W.;Koo, J.B.;Jin, H.;Kim, Y.;Lim, C.;Hong, C.H.;Kim, H.J.
    • Electronics and Telecommunications Trends
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    • v.37 no.2
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    • pp.30-41
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    • 2022
  • As the society is superaging, the number of patients with movement disabilities due to musculoskeletal or nervous system illness is rapidly increasing. To improve public health and reduce medical expenses, it is essential to develop rehabilitation systems that allow patients to resume their daily-life activities. However, the existing musculoskeletal illness diagnosis and rehabilitation method is limited in terms of precision and efficiency because it is based on an empirical diagnosis and prescription without regard for individual characteristics. To overcome these limits, it is critical to design a novel concept of routine rehabilitation therapy device that is capable of inducing musculoskeletal balance by the precise analysis of musculoskeletal usage patterns via the motion and the muscle activity tracking of linked muscles. This study introduces the trend of on-skin sensor device technology for routine musculoskeletal monitoring and therapy. For on-skin rehabilitation systems, skin-adhesive and stretchable motion/posture, electromyography, pressure sensors, small-size and low-power wireless sensor interfaces, and user-friendly rehabilitation contents based on new algorithms are combined.

How Promoting Proprioceptive Exercises Affects Pediatric Cobb's Angle (고유수용성감각기관들을 자극하는 운동법들이 소아 측만 각도 변화에 미치는 효과)

  • Jae-Man Yang;Han-Wook Kang
    • PNF and Movement
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    • v.21 no.3
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    • pp.367-376
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    • 2023
  • Purpose: The purpose of this study was to compare changes in pediatric Cobb's angle resulting from using the modified scoliosis exercise method to promote proprioception. Methods: There were 32 participants in this study. Cobb's angle was measured automatically using a ZeTTA PACS Viewer through a digital computer program with whole-body x-ray anterior to posterior. Scoliosis was diagnosed by a Cobb's angle of 10° or higher. Modified scoliosis exercises were used as the program for the three-stage method used in the study: the preparation phase (warm-up), actual exercise phase (main exercise), and final clean-up phase (cool-down). In this study, exercises that can promote proprioception, including muscle strengthening, stretching, equilibrium, myofascial release, balance taping, and traction, were applied, and their effects before and after treatment were compared. After implementing the exercise methods once a week-15 times total for about 4 months-the changes in Cobb's angle were measured. Results: After having the pediatric scoliosis patients practice the modified scoliosis exercises for four months, it was found that the Cobb's angle of the spine significantly decreased. Conclusion: The results of this study show that the modified pediatric scoliosis exercise, which is capable of promoting proprioception, is also effective in improving Cobb's angle.