• 대한기계학회논문집
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• 제16권12호
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• pp.2328-2339
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• 1992

본 연구에서는 일방향(unidirectional)으로 섬유가 강화된 복합재료를 다루게 되는데, 섬유는 직경이 모두 같고, 길이가 무한이며, 서로 평행하게 정렬되엉 불규칙 하게 분포된 원형실린더로 가정한다. 먼저, 임의의 한 기준 산란체에 의한 압축파 및 SV파의 산란을 수식화하고, 기준 산란체에 대한 나머지 산란체들이 존재할 확률을 이용하여 산란계수의 통계적 기대값을 구함으로써 그 매질내에 존재하는 파동의 전파 특성을 지배하는 분산 관계식의 해를 수치적으로 구함으로써 매질의 평균전파속도, 유 효 동탄성계수 및 감쇠계수를 주파수와 체적비의 함수로 구한다. 또 구하여진 동탄 성계수의 저주파 극한값과 정적하중상태에서 구한 Hashin-Rosen의 값들과 비교하여 봄 으로써 본 연구의 타당성을 입증한다.

• 대한기계학회논문집A
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• 제38권6호
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• pp.585-592
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• 2014

본 논문에서는 도마뱀 로봇 설계를 위한 생체운동 모사 다물체 동역학 시뮬레이터가 개발되었다. 시뮬레이터에 사용된 다물체-기구 동역학 모델은 상용 소프트웨어인 RecurDyn 에 쿠반에놀 도마뱀의 모션 캡쳐 데이터와 Micro-CT 데이터를 적용하여 생성되었다. 다양한 도마뱀의 보행 운동 특성 해석을 위해서 생체운동 시뮬레이터는 궤적 생성모듈, 역기구학 모듈, 역동역학 모듈로 구성된다. 궤적생성 모듈은 도마뱀의 속도에 따른 척추운동과 발 궤적을 생성한다. 또한, 도마뱀 로봇 설계를 위해서 역기구학을 통한 관절 각도 계산과 그를 통한 역동역학 해석으로 이동속도에 대한 요구 조인트 구동력을 생성한다.

• 대한물리의학회지
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• 제3권2호
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• pp.97-102
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• 2008

Purpose : The purpose of this study was to find the effect of foot bath on blood pressure(BP) following treadmill exercise. Methode : Subject of study were forty healthy males without any cardiovascular, musculoskeletal, and neurologic diseases. Following twenty minutes walking at a speed of 5m/s on the treadmill, ten twenty subjects in experimental group received foot bath, on the dominant lower limb while sitting in chair. Foot bath was applied to the level of the lateral and medial malleoli keeping the temperature of the paraffin bath at $40{\pm}0.5^{\circ}C$. Twenty subjects in control group took a rest sitting in chair in a comfortable position. BP was measured in right brachial artery. BP was measured five times(before exercise, immediately after exercise, 5 minutes, 10 minutes, and fifteen minutes after exercise). Results : The study showed that for diastolic blood pressure, there was no significant difference between the experimental and the control group. However, systolic blood pressure(SBP) increased significantly after exercise compared with SBP before exercise (p<.05). In addition, SBP in five minutes after exercise decreased significantly compared with SBP in immediately after exercise (p<.05). On the other hand, the control group had significant difference between SBP measured before exercise and SBP measured at the other measure time (p<.05). In five minutes after exercise, SBP in experimental group had significant difference with SBP in control group (p<.05). Similarly, in ten and fifteen minutes after exercise, SBP in experimental group had significantly difference with SBP in control group (p<.05). Conclusion : Consequently it was confirmed that when foot bath was applied, the increased BP induced by the exercise returned to normal range rapidly.

• 대한물리의학회지
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• 제13권3호
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• pp.39-47
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• 2018

PURPOSE: The purpose of this investigation was to conduct a systemic review of studies that examine the effects of strengthening exercise on gait ability and GMFM in children with cerebral palsy and propose a standard for cerebral palsy therapy based on a meta-analysis of the studies. METHODS: An extensive literature search was conducted using databases including the KISS (Korean studies Information Service System), RISS, DBpia, PubMed and ScienceDirect, with the following search terms: 'Strengthening Exercise,' 'Resistance Exercise,' 'Gait ability,' 'GMFM' or 'cerebral palsy'. RESULTS: Eleven studies were included in this review and the duration of the intervention varied from 5 to 24 weeks. The number of application per week was mostly 2-3 times, while 5 intervention per week was adopted in a few cases. The total number of intervention applied varied from 18 to 36 and the respective effect sizes of GMFM on crawling and sitting were very high (1.075 and .881) while those of GMFM on standing and walking were very low(.206 and .125). The effect size was for gait speed was only .221. CONCLUSION: Trunk exercise and lower limb exercise effectively improved GMFM in children with cerebral palsy, resulting in improved outcomes in sitting and crawling. The results of this study will be useful for designing evidencebased cerebral palsy therapy programs.

• 대한물리치료과학회지
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• 제8권2호
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• pp.961-965
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• 2001

The aim of this study is to present the basic reference data of age and specipic gait parameters for Korean Adult. The basic gait parameters were extracted from 20 Adult, 10 men and 10 women, 21 to 24 years of age using VICON 512 Motion Analyzer. The temporal gait parameters and kinematic parameters of Korean Adult similar to other western reference data. The results were as follows: 1) The mean Cadence of the male to the female were 113.5 steps/min to 117.6 steps/min. 2) The mean Walking Speed of the male to the female were 1.30 m/s, to 1.27 m/s. 3) The mean Stride Length of the male to the female were 1.35 m, to 1.30 m. 4) The mean maximal angles of pint on the pelvic tilt motion for different male to the female were $9.80^{\circ}$ to $7.75^{\circ}$. (p<0.05) 5) The mean maximal angles of pint on the hip flexion motion for different male to the female were $22.62^{\circ}$ to $27.65^{\circ}$. (p<0.05) 6) The mean maximal angles of pint on the knee flexion motion for different male to the female were $55.78^{\circ}$ to $55.49^{\circ}$. (p>0.05) 7) The mean maximal angles of pint on the ankle dorsiflexion motion for different male to the female were $12.47^{\circ}$ to $13.39^{\circ}$. (p>0.05).

• 한국항행학회논문지
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• 제24권5호
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• pp.444-449
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• 2020

본 연구에서는 구조가 간단하고 소형화 제작이 용이한 소형보행 로봇용 구동원을 제안한다. 두 개의 직교방향 모멘트를 핀조인트 구조의 다리에서 회전벡터로 변환하여 이동표면에 타원궤적이 발생하도록 설계하였고, 다른 구동원 대비 효율성과 에너지 밀도가 높은 압전 세라믹을 활용하여 압전벤더 액츄에어터를 제작하였다. 또한 사용된 압전 벤더 액츄에이터는 유한요소해석을 통한 자체 무게대비 최대의 출력을 낼 수 있도록 재질 및 형상을 최적화하였다. 두 개의 다리로 구성된 단위 액츄에이터는 모듈화 되어 여러 개의 액츄에이터로 결합이 가능하고 매운 빠른 속도로 이동 및 거친 지형에서도 운용이 가능하다. 실험결과로 T자형 로봇 액츄에이터의 다양한 속도 (2 mm/sec.에서 266 mm/sec까지)와 운송능력(최대 10 g에서 50 mm/s까지)을 확인 하였다.

• 한국산학기술학회논문지
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• 제15권11호
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• pp.6767-6773
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• 2014

본 연구는 고유수용성신경근촉진법의 체간 패턴 운동을 병행한 경두개직류자극이 뇌졸중 환자의 하지 근 활성도와 균형 능력, 보행 속도에 어떠한 영향을 미치는지 알아보기 위하여 실시하였다. 본 연구에는 총 31명의 뇌졸중 환자가 참여하였으며, 대상자들은 무작위 추출법을 통해서 실험군 15명과 대조군 16명으로 각각 배정되었다. 모든 대상자들은 고유수용성 신경근촉진법의 체간 패턴 운동을 6주 동안, 주 3회 20분 씩 시행하였고, 실험군에는 추가적으로 경두개직류자극을 20분 간 시행하였다. 연구 결과 실험군이 대조군에 비해 마비측 하지의 비복근, 전경골근의 활성도와 균형 능력에서 유의한 차이를 보였다(p<.05). 이러한 결과는 고유수용성신경근촉진법의 체간 패턴 운동을 병행한 경두개직류자극이 뇌졸중 환자의 하지 기능 회복에 긍정적인 효과를 가져다 준 것으로 사료된다.

• 대한물리치료과학회지
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• 제15권2호
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• pp.87-95
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• 2008

Background: Hemiplegic patients usually have difficulty maintaining balance. Balance training is a major component of there habilitation program for patients with neurological impairment. The purpose of this study was to investigate the effects of PLS(Posterior Leaf Spring), FES(Functional Electrical stimulation), treadmill training, and neurodevelopmental treatment on the improvement of balance in patients with hemiplegia. Methods: We looked into published studies from Dankook University’s electronic library databases of RISS4U, KMbase, NCBI, and MEDLIS concerning the effectiveness of any form of intervention leading to improvement of balance. All types of studies relevant to the topic that were published in English during the time period of 1986 to 2005 were included. Results: 1. There were significant differences in standing balance, dynamic activity balance, and gait speed between barefoot subjects and subjects who wore SPAFO and HPAFO(p<.05). 2. The changes in ROM and FRT related to sex, age, height, and weight part of the diagnosis, as well as experience relapse, was of meaningless value. Changes in ROM related to the duration of pain and experiences of falling down were also meaningless. However, FRT showed significant static differences(p<.05). 3. The body-weight-support treadmill training scoring of standing balance, step length, and a timed 10m walking test showed definite improvement. 4. The proprioceptive control approach improved dynamic balance in patients with hemiplegia. Conclusion: Consequently, further study is needed to verify methods when physical therapists are researching balance ability in hemiplegic patient.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 춘계학술대회
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• pp.576-579
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• 2018

본 연구는 만성뇌졸중 환자에게 적용한 동작관찰 과제지향 훈련이 균형 및 보행능력에 미치는 영향을 알아보고자 하였다. 연구에 동의한 만성 뇌졸중환자 30명중 동작관찰 과제지향훈련을 시행한 실험군 15명과 일반 과제지향훈련을 시행한 대조군 15명에게 총 6주간 하루 30분씩 훈련하였다. 훈련효과를 알아보기 위해 훈련전 균형은 BT4로 검사를 시행하였고 보행능력은 10M검사를 실시하였다. 이에 동작관찰 과제지향 훈련군이 일반과제 지향훈련군에 비해 균형과 보행능력에서 유의미한 차이를 보였다. 이에 동작관찰 과제지향훈련이 만성뇌졸중환자의 균형 및 보행능력에 효과적인 프로그램임을 알 수 있다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제30권5호
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• pp.480-488
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• 2008

Orthodontists often treat cases which are difficult to treat with conventional orthodontics. In such cases, it could be treated with surgical procedures with the help of an oral surgeon. Especially, transverse deficiency of the mandible can be corrected by widening the transverse width of mandibular symphysis, using distraction osteogenesis. Transverse widening of mandibular sympysis is known as a safe treatment but still complications could occur during the treatment. We are reporting some complications of cases that mandibular symphysis transverse widening were applied. Some cases showed complications because of the inappropriate osteotomy line. Since straight vertical osteotomy line was inclined to the left, only the left bony segment was likely to expand. According to bio-mechanical considerations, it will be better to perform a step osteotomy, cutting the eccentric area of the alveolar crest and the centric area of the basal symphyseal area. Complications could also occur by the failure of the distraction device. The tooth borne distraction device was attached on the lingual side of the tooth with composite resin. During the distraction period, it was impossible to obtain appropriate distraction speed and rhythm because of frequent fall off of the distraction device. Therefore, distraction device should be attached firmly with orthodontic band or bone screw, etc. Tooth mobility increasement could also occur as a complication. 'Walking teeth phenomenon' was observed during the distraction period, showing severe teeth mobility and pain during mastication. These symptoms fade out during the consolidation period. Since the patient could feel insecure and uncomfortable, it should be notified to the patient before the procedure. Finally, alveolar crestal bone loss could occur. Alveolar crestal bone loss occurred because of lack of distraction device firmness and teeth trauma caused by lower lip biting habit. Therefore, adequate firmness of the distraction device and habit control will be needed.