• 대한기계학회논문집A
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• 제28권10호
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• pp.1526-1533
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• 2004

The needs of walking assistant device such as the Ankle Foot Orthosis (A.F.O) are getting greater than before. However, most of the A.F.O are generally imported rather than domestic manufacturing. The major reason of high import reliability is the rack of impact properties of domestic commercial products. Therefore, this research is going to focus on the evaluation of impact properties of the A.F.O which has the high import reliability. Unfortunately, these kinds of researches are not performed sufficiently. This research is going to evaluate impact energy behavior in composite materials such as the glass/epoxy (S-glass, [0/90]sub 2S/) and the aramid/epoxy (Kevlar-29, woven type, 8 ply) of ankle foot orthosis. The approach methods were as follows. 1) The history of impact load and impact energy due to the various velocities. 2) Relationship between the deflection and damage shape according to the impact velocities. 3) The behavior of absorbed energy and residual strength rate due to the various impact velocities.

• 한국운동역학회지
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• 제18권4호
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• pp.89-97
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• 2008

본 연구의 목적은 테니스화의 종류에 따른 주행 특성 및 테니스 동작 수행 시 족저압력분석 방법을 활용하여 테니스화의 기능성을 평가하는데 있다. 하지의 상해가 없고 정상적인 보행동작을 수행하는 남자 대학생 10명을 선정하여 4종류 모델의 테니스화를 대상으로 직선주행, $45^{\circ}$ 방향전환주행, 포핸드 스트로그, 백핸드 스트로그 동작 시 족저압력을 측정한 후 COP(renter of pressure)경로, 평균족저압력, 최대족저압력, 최대지면반력을 분석하였다. 분석결과 직선달리기 동작 시 족저압력 분석결과 모든 제품이 우수한 것으로 분석되었고 통계적으로 유의미한 차이는 없었으며, $45^{\circ}$ 방향전환달리기동작, 포핸드 스트로그동작, 백핸드 스트로그 동작 시 최대지면반력과 최대족저압력 그리고 평균족저압력을 종합적으로 분석해 본 결과 통계적으로 유의미한 차이는 없었으나, C>A>B>D> 순으로 테니스화의 기능성이 우수한 것으로 분석되었다.

• 한국운동역학회지
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• 제26권3호
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• pp.265-272
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• 2016

Objective: The aim of this study was to analyze X-factor, triple X-factor, and the center of pressure (COP) according to the feel of golf driver swing. Method: For this research, 9 golfers from the Korea Professional Golfers' Association (age: $30.11{\pm}2.98yrs$, height: $178.00{\pm}8.42cm$, weight: $76.22{\pm}8.42kg$, experience: $10.06{\pm}3.11yrs$) were recruited to participate in the experiment. Twelve Motion Analysis Eagle-4 cameras were installed and an image analysis was conducted by using the NLT (non-linear transformation) method, and 2 units of Kistler type 5233A dynamometer were used to measure ground reaction force. The sampling ratio was set at 1000 Hz. The golfers each took 10 swings by using their own driver, and chose the best and worse feel from among 10 shots. A paired-sample t-test was used to analyze the results. Results: In regard to feel, no change in head speed, X-factor, and the triple X-factor's X-factor stretch, hip rise, and head swivel, was observed (p>.05). Regarding ground reaction force, a difference was observed between the top of the backswing (p<.05) and impact (p<.05) in the vertical force of the left foot. For COP, a difference was also observed between the mid backswing (p<.001), late backswing (p<.001), and top of the backswing (p<.05) for the right foot X-axis and Y-axis mid follow through (p<.01). Conclusion: It can be reasoned that, irrespective of feel, the head speed, X-factor and triple X-factor's X-factor stretch, hip rise and head swivel did not have an effect on drive distance for domestic golfers, and the vertical reaction force of the left foot and left-right movement span's pressure dispersal of the right foot had an increasing effect on drive distance.

• 한국동물위생학회지
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• 제34권2호
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• pp.95-102
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• 2011

Foot-and-mouth disease (FMD) is one of the most infectious diseases affecting cloven-hoofed animals including cattle, sheep, goats, and pigs. Seven serotypes of foot-and-mouth disease virus with multiple subtypes within each serotype have been identified until now. In particular, it has been demonstrated that the outbreak of the serotype Asia1 reported from China, Mongolia and North Korea since 2005 is mostly classified into genetic group V. Though it has been recommended that Asia1 Shamir strain can be used as a high priority vaccine by World References Laboratory for FMD, the complete nucleotide sequences of the strain has not yet been determined. In this study, to be prepared for Asia1 type viruses that may be brought into Korea, the complete genome sequence of this vaccine strain Asia1 Shamir including its 5' and 3' non-coding region was identified.

• 재활복지공학회논문지
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• 제10권3호
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• pp.199-206
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• 2016

대부분의 한국인은 오랜 좌식생활 때문에 팔자 걸음이나 안짱 걸음을 걷는 경우가 많고, 오늘날에는 보행 중 스마트폰 사용으로 인하여 올바른 자세의 보행이 더욱 어려워지고 있다. 본 연구는 현대 한국인의 걸음 실태를 쉽게 분석하고 사용자로 하여금 이를 알 수 있도록 하는 간편한 시스템을 구현하는 데 목적이 있다. 본 연구는 보행 유형을 분류하기 위하여 3축 가속도 센서와 족압 감지 시스템을 활용한 보행 모니터링 시스템을 개발하였다. 개발된 시스템은 걸을 때 발생하는 발의 압력(foot pressure)과, 상반신의 기울어진 정도를 각각 압력 센서(pressure sensor)와 3축 가속도계(3-axis accelerometer)를 통해 걷는 자세의 데이터를 취득할 수 있다. 이를 통해 몇 가지 보행 유형과 센서 데이터 간의 상관관계를 분석하였다. 그 결과 상체 자세 판별에는 통계적 모수인 제곱평균제곱근과 표준편차가, 보행 유행 판별에는 k-최근접 이웃 알고리즘이 적합하다는 사실을 확인하였다. 고안된 시스템은 저비용의 의학, 체육 분야에 응용될 수 있다.

• 대한족부족관절학회지
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• 제6권2호
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• pp.201-207
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• 2002

Purpose: To present the clinical analysis of the results obtained in 38 cases of displaced intraarticular calcaneal fractures undergone combined percutaneous axial pin fixation of calcaneal body and minimal internal fixation using extensile lateral approach. Materials and Methods: From March 2000 to February 2002, thirty-eight displaced intraarticular fractures of the calcaneus in 35 patients were fixed with 3.5mm cannulated screws and percutaneous 2.5mm K-wires. The extensile lateral approach was used in all cases. The average follow-up period was 16 months. Clinical evaluation was assessed according to the Ankle-Hind Foot Scale of American Orthopedic Foot and Ankle Society. Results: The clinical results were graded as excellent in 8 cases(21%), good in 22 cases(58%), fair in 6 cases(16%), and poor in 2 cases(5%). Two cases of poor result were type IV of Sanders classification. The postoperative reduction status of the articular surface was analyzed by computed tomography in all cases and was found to be less 2mm of step off in 30 cases and between 2 and 4mm in 8 cases. Unsatisfactory results were correlated with severity of articular comminution and failure to obtain accurate reduction of the articular surface. Using early functional postoperative care, all fractures healed without secondary displacement except 1 case on an average of ten weeks. Two cases had superficial necrosis of the wound margins, however, secondary wound healing was uneventful and skin grafting was not needed. Conclusion: Combined minimal internal fixation and percutaneous pin fixation using extensile lateral approach is useful operative method of intraarticular calcaneal fractures because providing enough stability to permit functional aftercare and allowing excellent anatomical reduction. In addition, this method diminishes the risk of lateral soft tissue problems.

• 대한화상학회지
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• 제23권1호
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• pp.20-24
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• 2020

Diabetic patients have an increased risk of burn injuries on foot. Because of their diabetic neuropathy, they could contact with hot water or warming device without being aware of it. Split-thickness skin graft (STSG) is successful in treatment of various wound types; however, donor site wounds are sometimes problematic, and complications such as pain and impaired healing often occur. Although, donor site wounds in healthy young individuals can rapidly heal without complications, the wound-healing capacity of elderly patients or those with a comorbidity has been reported to be low. The dermatome is the most commonly used tool because it can harvest a large skin graft in one attempt. However, it is difficult to harvest tissues if the area is not flat. Furthermore, because the harvested skin is usually rectangular, additional skin usually remains after skin grafting. Therefore, use of razor blade and fragmented STSG on a large defect area is advantageous for harvesting a graft with a desired size, shape, and thickness. From January 2018 to July 2018, fragmented STSG was used in 9 patients who suffered from burn induced open wound on foot with diabetic neuropathy. With this approach, healing process was relatively rapid. The mean age of patients was 70 (57~86 years) and all of 9 patients had diabetes mellitus type 2. In all patients, the skin graft on the defect site healed well and did not result in complications such as hematoma or seroma.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1995년도 춘계학술대회논문집
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• pp.72-83
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• 1995

This study are to investigate the variations of the recruitment patterns of the nine lower extremity muscles, and to analyze the changes of the role assigned to each muscle during the seated posture. For exertion levels, the transition point of type F more unit of each muscle is inferred by analyzing the electromyogram at the seated postures. Also, for predetermined seated foot operations exertion levels, the recruitment pattern and the changes of the role assigned are identified in the continuous exertion, by analyzing the electromyogram change sdue to the accumulated muscle fatigue. The developed model can be used to design and to assess the pedals and foot-related equipments design.

• 한방비만학회지
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• 제7권2호
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• pp.77-84
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• 2007

Obejectives : Slow-motion strengthening trainings build up muscles better than any other type of training, these exercises focus on balancing and strengthening the muscles in the anatomical center of the body - the core - which includes the back, hip and abdominal muscles. Methods : We had a concept of 'core', and compared core muscles with 12 meridian tendino-musculature based on Thomas Myers' myofascial meridian. Results : It has been suggested that the core muscles correspond to meridians of foot- three Yin and foot- three Yang. The study of core muscles strengthening exercise and movement therapy is requred.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.523-528
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• 2000

In this paper, the new type biped walking robot which is composed of the minimum number or links just for walking and its appropriate gaits are proposed. The proposed new gaits for this robot are four-crossing, crawling, standing and turning gait. In designing the biped robot we propose the Performance Index which means the needed torque per a moving distance and generate foot trajectories by $3^{rd}$ order spline Interpolation. Among those, numerically we find the optimal conditions which minimize the Performance Index. Dynamically stable walking of the biped robot is realized by satisfying the stability condition of ZMP(zero moment point), which is related to maintaining the ZMP within the region of the supporting foot during the s1n91e leg support phase. We determine the region of mass center from the stability condition of ZMP and plan references which track the mass conte. trajectory of constant velocity. Finally we implement the gaits statically tracking the planned trajectories using PD control method.