• 한국화재소방학회논문지
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• 제34권2호
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• pp.41-48
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• 2020

건물화재 시 발생한 연기는 천장에서부터 내려오는 특성을 가진다. 이러한 특성으로 인해 화재상황에 따라 연기가 존재하는 공간을 지나는 사람들의 보행 가능 높이는 낮아지게 된다. 이에 본 연구에서는 보행 가능 높이에 따라 사람들의 보행속력을 분석하기 위해 보행실험을 수행하였다. 실험은 남녀 총 23명의 참가자가 참여하였다. 실험에 대한 분석결과, 전체적으로 보행 가능 높이가 낮아질수록 실험참가자들의 평균 보행속도는 낮아졌다. 하지만 보행가능 높이가 1.2 m일 때의 보행속도만이 자유보행속도와 비교하여 유의미한 차이를 나타냈다. 또한, 실험참가자들의 BMI 지수 등급(저체중, 정상, 과체중, 비만)에 따라 분석한 결과 각 BMI 지수 등급 사이에는 유의미한 차이를 나타내지 못했다. 하지만 정상 등급은 경우 보행 가능 높이가 1.2 m에서의 보행속도가 정상 등급의 자유보행속도와 비교하여 유의미하게 저하되었고, 과체중 등급의 경우 1.8 m, 1.7 m에서의 보행속도가 과체중 등급의 자유보행속도와 비교하여 유의미하게 증가하였다.

• 생명과학회지
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• 제19권11호
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• pp.1644-1650
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• 2009

본 연구는 운동을 하지 않는 여자 중학생을 대상으로 걷기운동이 체구성, 체력, 심혈관 기능, 혈청지질, GH, IGF-1 및 Leptin에 미치는 효과를 분석하기 위하여 걷기운동을 12주간 수행한 결과 비만집단과 일반집단 모두 체구성, 체력 심혈관 기능, 혈청지질 및 인슐린 인자에서 긍정적인 변화를 보였으며, 특히 비만집단은 체지방의 감소효과가 컸고, 일반집단은 근육량의 향상에 효과가 컸으며, 두 집단 모두 체력요인의 향상이 있었고 심혈관 기능과 혈청지질 및 인슐린 인자의 변화에도 여러 요인에서 유의한 효과가 있었다. 이러한 결과는 청소년시기에 바쁜 생활패턴에서 걷기운동만으로도 여중생의 체구성과 체력을 정상적으로 유지시킬 수 있는 좋은 운동 프로그램이 될 수 있음을 나타내고 있다. 그러나 이러한 긍정적인 변화를 지속시키기 위해서는 올바른 식습관(diet)과 보다 긴 걷기운동시간이 필요하다. 본 실험의 대상자들 또한 실험기간 중 정해진 운동시간외에 개인적 걷기운동량이 하루 15분정도 증가하였다. 운동추후의 연구에서는 운동기간의 증가와 운동 강도의 증가에 따른 지속적인 변화의 분석을 위한 연구가 필요하다고 생각된다.

• 한국운동역학회지
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• 제16권2호
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• pp.193-205
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• 2006

This study was to analysis the kinematic and kinetic differences between new walking shoe(NWS : RYN) and general walking shoe(GWS). The subjects for this study were 10 male adults who had the walking pattern of rearfoot shrike with normal foot. The movement of one lower leg was measured using plantar pressure and Vicon Motion Analysis Program(6 MX13 and 2 MX40 cameras : 100 f / s) while the subjects walked at the velocity(1.5m/s. on 2m).. The results of this study was as follows : 1. The NWS was better than the GWS that caused injuries such as adduction, abduction and pronation are reduced While walking on a perpendicular surface, the landing angle and the knees angles were extensive which makes walking more safe which reduces anxiety and uneasiness. 2. The bottom of the NWS were now made into a more circular arch which supports the weight of the body and reduces the irregular angles when wearing GWS. This arch made the supporting area more wide which made the upholding the trunk of the body more effective. The whole bottom of the foot that supports the weight is more flexible in addition, increases the safeness of walking patterns and the momentum of the body. 3. The moment the heel of the foot of the NWS touch the ground, the range of the pressure were partially notable and the range of the pressure on the upper part of the thigh were dispersed The injuries that occurred while walking. primary factors when a shock related injuries are reduced Judgements of the impacts of the knees and the spinal column dispersing could be made.

• 한국전문물리치료학회지
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• 제14권3호
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• pp.23-31
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• 2007

The purpose of this study was to determine the influence of high-heeled shoes on walking of obese women as it was already proven an extrinsic factor of knee osteoarthritis in women with normal weight. In this study the aimed therefore in particular was to utilize high-heeled shoes in proving it's causal influence on knee osteoarthritis by measuring the angle and torque of the knee joint. Fifteen obese women (BMI>25 $kg/m^2$) were measured in their twenties. Each angle and torque of their knee joints during walking on 6.5 cm high-heeled shoes and with a bare feet, were compared with each other and analyzed with a 3D motion analysis system. There was no significant difference in walking speed, cadence and stride length between the two conditions. However, there was a significant increase in a double limb support time and the stance phase when walking on high-heeled shoes as when walking with bare feet. The peak knee flexion angle and peak knee varus torque was higher when walking on high-heeled shoes than with bare feet. On the contrary, the peak knee flexion angle in the swing phase was not statistically different. The prolongation of peak knee varus torque was also proven. There was a significant increase in peak knee varus torque in the initial and last stance phases during walking on high-heeled shoes as compared to walking on bare feet. Through the above results, it was proven that when obese women walked on high-heeled shoes, rather than with bare feet, peak knee flexor and varus torque increased along with the changes of the in knee joint angle. Therefore, the influence of high-heeled shoes might be a significant intrinsic factor in knee osteoarthritis of obese women.

• 한국정밀공학회지
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• 제24권1호
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• pp.118-125
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• 2007

In this study, we analyzed the plantar shear stress and normal pressure in lateral heel diabetic foot patients during walking by using in-shoe local shear stress and plantar pressure measurement systems. The shear force transducer based on the magnetic-resistive principle, was a rigid 3-layer circular disc. Shear transducers were mounted on the locations of four metatarsal heads and heel in the insole. Twelve normal subjects and three diabetic foot patients with diabetic neuropathy in the lateral heel participated in this study. The center of pressure in lateral heel diabetic foot patients moved more medially and directed toward the first, medial to the second metatarsal heads, and the hallux during late stance, making pressure at the medial heel and the second metatarsal head significantly larger than in the normal. Shear stress at the heel changed significantly in early stance and the magnitude of shear stresses in each metatarsal head also changed. Further studies would be very helpful to design foot orthoses in patients with diabetic neuropathy or other diseases.

• 한국전문물리치료학회지
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• 제3권2호
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• pp.36-41
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• 1996

The purpose of this study was to determine whether the biomechanical variables of the walking patterns of the obese children compared with those of normal children would revealing significant differences. Normal(N=25) and obese(N=19) subjects were screened based on a health record which was examined to eliminate any subjects who had any pathological condition related to their gait. Data for a minimum of 5 repeated walking trials were collected using a stop watch and a tape measure. Basic kinematic analyses yielded data based on the following variables : stride length divided by leg length, and cadence divided by leg length. This measurement data was classified by the Obesity Index calculated from by height, weight data. Results showed no significant difference among normal, obese and subjects(p>.05). Difficulties in formulating the experimental condition and poor equipment quality are thought to be reason for the inconclusive results. Future studies might include medical complications such as tibia vara, genu valgum, other diseases caused by obesity.

• 로봇학회논문지
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• 제15권4호
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• pp.323-329
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• 2020

This paper presents a control algorithm for a wearable walking aid robot for subjects with paraplegia after stroke. After a stroke, a slow, asymmetrical and unstable gait pattern is observed in a number of patients. In many cases, one leg can move in a relatively normal pattern, while the other leg is dysfunctional due to paralysis. We have adopted the so-called assist-as-needed control that encourages the patient to walk as much as possible while the robot assists as necessary to create the gait motion of the paralyzed leg. A virtual wall was implemented for the assist-as-needed control. A position based admittance controller was applied in the swing phase to follow human intentions for both the normal and paralyzed legs. A position controller was applied in the stance phase for both legs. A power controller was applied to obtain stable performance in that the output power of the system was delimited during the sample interval. In order to verify the proposed control algorithm, we performed a simulation with 1-DOF leg models. The preliminary results have shown that the control algorithm can follow human intentions during the swing phase by providing as much assistance as needed. In addition, the virtual wall effectively guided the paralyzed leg with stable force display.

• 국제물리치료학회지
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• 제3권1호
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• pp.364-369
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• 2012

The purpose of this study was to analyze lower limb muscle activity and 3D motion analysis according to change foot arch height during walking. We selected 9 young and healthy people who have been normal foot. And we selected 7 young and healthy people who have been flatfoot. So, people were divided into 2 groups and walked platform during 2 minutes twice for checked by 3D motion analysis. These data were characterized by EMG measurements of three muscles( tibialis anterior, medial and lateral gastrocnemius) while they were walking. The collected data were analyzed by Independent t test using the SPSS statistics program(Ver 12.0). In foot arch change, there were no significant difference in three muscles 3D motion analysis also found that there were no significant difference in joint angles. In this study was to analyze lower limb muscle activity and 3D motion analysis according to change foot arch, but there were no significant difference in 6 muscles neither joint angles.

• 재활복지공학회논문지
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• 제4권1호
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• pp.23-28
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• 2010

심폐기능 허약자의 경우 다른 보행기능은 정상이지만 산소 공급에 문제가 발생된 경우로서, 에너지 소모를 최소한으로 줄여주는 보행보조 시스템이 필요하다. 심폐기능 허약자의 보행을 원활히 보조하기 위하여 본 연구에서는 고관절에 부착된 DC모터를 이용하여, 보행시 고관절 굴곡 및 신전을 제어하는 시스템을 고안하였다. 두 개의 모터를 좌우 고관절에 부착되어 정상 보행패턴을 기준으로 고관절의 굴곡과 신전의 설정각도를 정의하고 보행을 보조한다. 실험결과 보행보조에 의한 에너지 소모도 감소는 14.8%이었다.

• 한국운동역학회지
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• 제13권2호
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• pp.161-173
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• 2003

This study was performed to investigate the kinematic and kinetic differences between functional walking shoe(FWS) and general sports shoe(GSS). The subjects for this study were 4 male adults who had the walking pattern of rearfoot strike with normal feet. The movement of one lower leg was measured using force platform and 3 video cameras while the subjects walked at the velocity of 2/1.5 m/s. The findings of this study were as follows 1. The angle of lower leg-ground and angle of knee with FWS was greater than with GSS at the moment of strike the floor and the moment of second peak ground reaction force. The decreasing rate of angle of ankle was smaller in FWS from the strike phase to the second peak ground reaction force. These mean upright walking and round walking along the shoe surface. 2. The maximal Increased angle of Achilles tendon and the minimal decreased angle of rearfoot were smaller in FWS very significantly(p<0.001). Thus FWS prevent the excessive pronation of ankle and have good of rear-foot control. 3. The vortical ground reaction force and the rate of it to the BW were smaller in FWS statistically(p<0.001). The loading rate was smaller in FWS, too, and thess represent the reduction of load on ankle joint and prevention of injuries on it.