• 한방안이비인후피부과학회지
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• 제19권1호
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• pp.135-144
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• 2006

Objective : The purpose of this study was to know the clinical effects of hydrotherapy based Ultrasonic spa using SoPung-Tang on pulse wave velocity in patients with sequelae of CVA. Methods : PWV(Pulse wave velocity), Bio Chemistry, Hematology, Blood Pressure were investigated in 20 patients(Experimental group 13, Control group 7) who have been in Semyung Oriental medicine hospital from December 2005 to February 2006. Results : 1. In experimental group, Rt PWV diminished 4.8%, Lt PWV 5.1%. 2. In control group, Rt PWV diminished 3.3%, Lt PWV 1.8%. Conclusion : Hydrotherapy based Ultrasonic spa using SoPung-Tang showed useful effects in patients with sequelae of CVA.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.156-162
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• 2006

Pipe thinning is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. In this paper, we proposed the method for monitoring pipe thinning. Our basic idea come from that a group velocity of impact wave is different as wall thickness. If the group velocity is measured, wall thickness can be estimated. To obtain the group velocity, time-frequency analysis is used. This is because an arrival time difference can be measured easily in time-frequency domain rather than time domain. To test the performance of this technique, experiments have been performed for a plate and U type pipe. Results show that the proposed technique is quite powerful in the monitoring pipe thinning.

• 한국소음진동공학회논문집
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• 제16권12호
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• pp.1224-1230
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• 2006

Pipe thinning is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. In this paper, we proposed the method for monitoring pipe thinning. Our basic idea come from that a group velocity of impact wave is different as wall thickness. If the group velocity is measured, wall thickness can be estimated. To obtain the group velocity, time -frequency analysis is used. This is because an arrival time difference can be measured easily in time-frequency domain rather than time domain. To test the performance of this technique, experiments have been performed for a plate and U type pipe. Results show that the proposed technique is quite powerful in the monitoring pipe thinning.

• 대한치과보철학회지
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• 제25권1호
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• pp.181-193
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• 1987

Author examined the chewing patterns between the 16 normal subjects and the 10 complete denture wearers with LED mandibular tracking device, and analized the chewing envelope and opening, closing velocity during chewing various test foods-standardized carrot, ham and almond. The results were as follows; 1. The chewing envelope of carrot chewing was greater than that of ham chewing in both groups. 2. The average opening velocity was faster than the average closing velocity in both groups. 3. During chewing carrot or almond, the chewing envelope of dentate stoup was greater than that of denture group, but during chewing ham, there was no statistical difference. 4. During chewing carrot or almond the average opening and closing velocity in dentate group were faster than those of denture group.

• 한국소음진동공학회논문집
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• 제26권4호
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• pp.483-491
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• 2016

Precision of theoretical group velocity of waves in shell structures was discussed for the purpose of source localization of loose parts impact in pressure vessels of nuclear power plants. Estimating exact location of loose parts impact inside a reactor or a steam generator is very important in safety management of a NPP. Evaluation of correct propagation velocity of impact signals in pressure vessels, most of which are shell structures, is essential in impact source localization. Theoretical group velocities of impact signals in a plate and a shell were calculated by wave equations and compared to the velocities measured experimentally in a plate specimen and a scale model of a nuclear reactor. The wave equation applicable to source localization algorithm in shell structures was chosen by the study.

• 자원환경지질
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• 제52권6호
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• pp.555-560
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• 2019

중국 지역 4개 지진에서 발생한 2~30초 범위의 레일리파를 이용하여 북한 지역의 1차원 전단파 속도구조를 구하였다. 레일리파는 남북한의 국경선 인근에 위치한 5개의 광대역 관측소(BRD, SNU, CHNB, YKB, KSA)에 양호하게 기록되었다. 다중필터분석를 이용하여 레일리파 기본모드 군속도가 계산되었고 이는 다시 위상부합필터를 적용하여 개선되었다. 2.9~3.2 km/s의 범위에 이르는 평균 분산곡선을 역산하여 전단파 속도를 구하였다. 지진원으로부터 BRD 관측소의 경로에서 추출된 4~6초 주기의 상대적으로 느린 군속도는 서해 서한만분지의 퇴적층군과 연관되었을 가능성이 있다. 14~20km의 상대적으로 깊은 지역 전단파 저속도층은 평남분지와 관련된 것으로 생각되며 낭림육괴와 평남분지에 분포하는 변성암 및 화강암체는 표면부터 14km 깊이의 빠른 전단파 속도와 일치한다.

• Korean Chemical Engineering Research
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• 제50권3호
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• pp.522-526
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• 2012

수직 고체하강관에서 고체하강속도를 측정할 수 있는 편리한 실험방법을 제시하였으며 Geldart 분류 A, B, D 입자를 사용하여 수직관의 직경 및 입자특성 변화에 따른 고체하강속도를 측정 및 고찰하였다. 초기 입자 장입량 변화에 따른 고체하강속도의 변화는 크지 않았으며 고체하강관 직경이 증가함에 따라 고체흐름속도, 고체순환속도 및 고체하강속도가 증가하는 경향을 나타내었다. 특히 고체하강속도의 경우 모든 입자에 대해 하강관의 직경이 증가함에 따라 직선적으로 증가하는 경향을 나타내었으며, Geldart 분류 A 및 B 입자와 Geldart 분류 D 입자의 결과가 확실하게 구별되는 경향을 나타내었다. 측정된 고체하강속도를 바탕으로 Geldart 분류 A 및 B 입자계와 D 입자계에 대한 고체하강속도 상관식을 제시하였으며 측정값과 유사한 값을 예측할 수 있었다.

• 대한물리치료과학회지
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• 제17권1_2호
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• pp.67-76
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• 2010

Background: The purpose of this study was to evaluate the influence of ankle strategy exercise on balance ability in the women of octogenarians. Methods: Ankle strategy exercise group(n=14), leg strengthening exercise group(n=14) were measured an balance ability by Berg Balance Scale(BBS) scores and Balance Performance Monitor(BPM) at pre-intervention and post-intervention in 6weeks. Results: This study were summarized as follows : 1. The BBS scores, sway area, sway path length, sway maximum velocity of ankle strategy exercise group and leg strengthening exercise group were significantly different among the intervention period(p<.05). 2. The improvement of BBS scores, sway area, sway path length, sway maximum velocity were significantly different between ankle strategy exercise group and leg strengthening exercise group at in 6weeks(p<.05). Conclusion: Learned from the ankle strategy exercise could improve BBS scores, sway area, sway path length, sway maximum velocity and a balance for the women of octogenarians. Ankle strategy exercise need to be applied clinically for balance ability of the women of octogenarians.

• 대한물리의학회지
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• 제5권4호
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• pp.569-576
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• 2010

Purpose : This study was aimed at determining the effects of community-based exercise program to improve leg muscle strength and balance for elderly women. Methods : This study was nonequivalent control group pre-post test design. Subjects were assigned to two different groups(exercise group=11, control group=7). Exercise group performed community-based exercise program for 8 weeks. Outcome measures included leg muscle strength, balance, walking velocity, activities of daily living(ADL), exercise self-efficacy and health-related quality of life(QoL). The collected data analyzed by independent t-test and paired t-test. Results : Leg muscle strength, walking velocity and mental component summary(QoL) were significantly improved in the exercise group. But balance and exercise self-efficacy were significantly worsened in the control group. There were no significant difference between groups after 8 weeks of community-based exercise. Conclusion : These results suggested that the community-based exercise program is effective for elderly women in improving leg muscle strength, walking velocity and mental component summary(QoL).

• Physical Therapy Rehabilitation Science
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• 제10권3호
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• pp.270-277
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• 2021

Objective: The purpose of this study is to compare the effect of static balance, lower extremity function, and gait ability between a lower extremity restrain robot gait training and a general robot gait training in subacute stroke subjects. Design: Two-group pretest-posttest design. Methods: A total of 12 subacute stroke patients were randomly divided into an Experimental group (n=6) and a control group (n=6). Both groups were performed for four weeks, three times a week, for 20 minutes. To compare the Static balance function, the center of pressure (COP) path-length and COP velocity were measured. The Fugl-Meyer assessment lower extremity (FMA-LE) were evaluated to compare the Lower Extremity function. 2D Dartfish Program and 10 Meter Walking Test (10 MWT) on Gait ability were evaluated to compare the gait function. Results: In the intra-group comparison, Experimental groups showed significant improvement in COP path-length, velocity, Lower Extremity Function, 10 MWT, Cadence, by comparing the parameters before and after the intervention (p<0.05). Comparison of the amount of change between groups revealed significant improvement for parameters in the COP path-length, velocity, Lower extremity function, 10 MWT by comparing the parameters before and after the intervention (p<0.01). Conclusions: The Experimental group showed enhanced efficacy for variables such as COP path-length, velocity, Lower extremity function, 10 MWT as compared to the control group.