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On the mitigation of surf-riding by adjusting center of buoyancy in design stage

  • Yu, Liwei;Ma, Ning;Gu, Xiechong
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.9 no.3
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    • pp.292-304
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    • 2017
  • High-speed vessels are prone to the surf-riding in adverse quartering seas. The possibility of mitigating the surf-riding of the ITTC A2 fishing vessel in the design stage is investigated using the 6-DOF weakly non-linear model developed for surf-riding simulations in quartering seas. The longitudinal position of the ship's center of buoyancy (LCB) is chosen as the design parameter. The adjusting of LCB is achieved by changing frame area curves, and hull surfaces are reconstructed accordingly using the Radial Basis Function (RBF). Surf-riding motions in regular following seas for cases with different LCBs and Froude numbers are simulated using the numerical model. Results show that the surf-riding cannot be prevented by the adjusting of LCB. However, it occurs with a higher threshold speed when ship's center of buoyancy (COB) is moved towards stem compared to moving towards stern, which is mainly due to the differences on wave resistance caused by the adjusting of LCB.

The Effect of Horse-Riding Exercise on Pain and Body Flexibility for the Patient with Chronic Low Back Pain (승마 운동이 만성요통환자의 통증 및 체간 유연성에 미치는 영향)

  • Lee, Chaewoo;Lee, Insil;Kim, Hyeonsu
    • Journal of The Korean Society of Integrative Medicine
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    • v.1 no.3
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    • pp.111-118
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    • 2013
  • Purpose : The purpose of this study was to investigate the effect of horse riding exercise for pain and body flexibility in the patient with chronic low back pain. Method : 26 subjects in H-equestrian were randomly divided two group, ball exercise(BE) group and horse-riding exercise(HE) group. Each group carried out 40 minutes exercise three times a week for 8 weeks. VAS were measured for pain, and evaluation of body flexibility in position with forward and backward. Result : The results were as follows, the pain scales of VAS(visual analog scale) between ball exercise and horse-riding exercise groups in post-test, were significantly different in measures(p<.05). And there were significant in two group after exercise(p<.05). The flexibility scales of body between ball exercise and horse-riding exercise groups in post-test, were significantly different in measures(p<.05). And there were significant in two group after exercise(p<.05). Conclusion : These finding revealed that horse-riding exercise was effective on pain and body flexibility of patient with chronic low back pain so that these exercise can be new altematives exercise for pain and body flexibility in the patient with chronic low back pain.

The Effect of Horse-Riding Exercise on Pain and Body Flexibility for the Patient with Chronic Low Back Pain (승마 운동이 직장여성의 비만도에 미치는 영향)

  • Lee, Chaewoo;Lee, Insil;Kim, Hyeonsu
    • Journal of The Korean Society of Integrative Medicine
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    • v.1 no.4
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    • pp.67-74
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    • 2013
  • Purpose : The purpose of this study was to investigate the effect of horseback riding exercise for BMI(body mass index) and waist circumference in the obese women. Method : 20 subjects in Y-equestrian were randomly divided two group, horseback machine exercise(HME) group and horseback-riding exercise(HRE) group. Each group carried out 30 minutes exercise two times a week for 8 weeks. BMI were measured for body composition, and evaluation of waist circumference. Result : The results were as follows, the BMI(body mass index) between horseback machine exercise and horseback-riding exercise groups in post-test, were significantly different in measures(p<.05). And there were significant in two group after exercise(p<.05). The waist circumference between horseback machine exercise and horseback-riding exercise groups in post-test, were significantly different in measures(p<.05). And there were significant in two group after exercise(p<.05). Conclusion : These finding revealed that horseback-riding exercise was effective on BMI and waist circumrerence of obese women so that these exercise can be new altematives exercise for obesity management in the obese women.

The Effect of Horse-Riding Exercise on the Balance Ability in the Frail Woman Elderly People (승마 운동이 여성 노인의 균형능력에 미치는 영향)

  • Lee, Chaewoo;Lee, Insil;Kim, Hyeonsu
    • Journal of The Korean Society of Integrative Medicine
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    • v.1 no.2
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    • pp.59-66
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    • 2013
  • Purpose : The purpose of this study was to investigate the effect of horse riding exercise for the prevention of falls in the frail woman elderly people. Method : 30 subjects in H-equestrian and N-equestrian were randomly divided two group, aero-step exercise group and horse-riding exercise group. Each group carried out 40 minutes exercise three times a week for 8 weeks. TUG were measured for dynamic balance ability, and sway path of COP movement during standing were measured for evaluation of static balance ability in balance performance monitor(BPM). Result : The results were as follows, the dynamic balance scales of TUG between aero-step exercise and horse-riding exercise groups in post-test, were significantly different in measures(p<.05). And there were significant in two group after exercise(p<.05). The static balance scales of sway path between aero-step exercise and horse-riding exercise groups in post-test, were significantly different in measures(p<.05). And there were significant in two group after exercise(p<.05). Conclusion : These finding revealed that horse-riding exercise was effective on dynamic and static balance abiility of elderly people so that these exercise can be new altematives for the prevention of falls in the frail woman elderly people.

The Effect of Horse-Riding Exercise on the Balance Ability in the Chronic Low Back Pain Patients (승마 운동이 만성 요통환자의 균형능력에 미치는 영향)

  • Lee, Chaewoo;Kim, Hyeonsu;Lee, Insil
    • Journal of The Korean Society of Integrative Medicine
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    • v.2 no.1
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    • pp.101-108
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    • 2014
  • Purpose : The purpose of this study was to investigate the effect of horse riding exercise for chronic low back pain patients. Method : 30 subjects in H-equestrian and N-equestrian, K & B hospital were randomly divided two group, instability support surface exercise group and horse-riding exercise group. Each group carried out 40 minutes exercise three times a week for 8 weeks. VAS were measured for sway path of COP movement during standing were measured for evaluation of static balance ability in balance performance monitor(BPM). Result : The results were as follows, scales of VAS between instability support surface exercise and horse-riding exercise groups in post-test, were significantly different in measures(p<.05). And there were significant in two group after exercise(p<.05). The static balance scales of sway path between instability support surface exercise and horse-riding exercise groups in post-test, were significantly different in measures(p<.05). And there were significant in two group after exercise(p<.05). Conclusion : These finding revealed that horse-riding exercise was effective on VAS and static balance abiility of chronic low back pain patient so that these exercise can be new altematives for increase of stability ability in chronic low back pain patients.

Effects of Rehabilitation Horse Riding on the Balance and Geriatric Quality of Life Scale of the Elderly (재활승마가 노인의 균형과 노인 삶의 질척도에 미치는 영향)

  • Kim, Eun-Ja;Kim, Myung-Joon;Lee, Moon-Ha;Kim, Dae-Hun
    • The Journal of Korean Society for Neurotherapy
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    • v.22 no.3
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    • pp.1-5
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    • 2018
  • Purpose The purpose of this study was to investigate the effect of rehabilitation horse riding exercise on the balance and Geriatric Quality of Life Scale (GQOL) of the elderly. Methods The subjects were 14 elderly males who consisted of 7 in the experimental group and 7 in the control group. The subjected performed rehabilitation horse riding exercise twice a week for 12 weeks. For balance measurements, leftright and anteriorposterior weight bearing, and BBS were tested using GymPlate. In addition, the GQOL was evaluated. Results The results of this study show that in the experimental group, there were significant differences in balance ability and GQOL after the rehabilitation horse riding exercise (P<0.01), but there was no significant difference in the control group (P>0.05). Furthermore, the experimental and control groups showed significant differences in balance ability and GQOL (P<0.01). Conclusion Rehabilitation horse riding exercise is effective in improving the balance ability of the elderly, which also had an effect on the GQOL.

The Study of Blood metabolic Variation on 10Km Horseback Riding and Running (10km 승마운동과 달리기 운동 시 혈중 대사 변화 연구)

  • Nam, Sang-Nam;Park, Jeong-Bum
    • Journal of the Korea Convergence Society
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    • v.9 no.4
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    • pp.381-386
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    • 2018
  • This study aims to provide a scientific proof of the effects of horseback riding sports by analyzing changes in metabolic variation of horseback riding and running before and after 10km running. Paired t-test and independent t-test were conducted to process the data. The results show that among lipid source glucose significantly increases for horseback riding group $97.78{\pm}14.55mg/dl$ to $123.21{\pm}33.88mg/dl$, (p<.05). TC horseback riding group $188.71{\pm}35.25mg/dl$ to $199.35{\pm}32.79mg/dl$(p<.01), LDL-C also significant increases in riding group $113.42{\pm}33.39mg/dl$ to $121.42{\pm}32.52mg/dl$(p<.01). HDL-C also shows significant increase; in riding group $53.42{\pm}14.36mg/dl$ to $56.64{\pm}15.24mg/dl$(p<.01). show that among lipid variation glucose significantly change in horseback riding group, TC horseback riding group, LDL-C also change in riding group.

Meta-Analysis on the Effect of Therapeutic Horseback Riding on Children with Developmental Disabilities and Neural Patients

  • Noh, Hyunju;Kim, Jiyoung;Park, Jiwon
    • The Journal of Korean Physical Therapy
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    • v.32 no.5
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    • pp.312-318
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    • 2020
  • Purpose: This study aimed to investigate the evidence that therapeutic horseback riding can improve balance, muscle, ADL, equivalenc, GMFM, gait, emotion with developmental disabilities and neural patients. Methods: To conduct meta-analysis, the search focused on studies that employed therapeutic horseback riding for developmental disabilities and neural patients for which eight databases (KIS, RISS, DBpia, National Assembly Library, Pubmed, Embase, Google scholar and Cochrane Library) were used to extract literature published from 2002 to September 2019. The data were analyzed the RevMan 3.5.3 program. Results: As a result of meta-analysis, therapeutic horseback riding total effect size is 0.552 for children with developmental disabilities and neural patients. And effect size result of according to assessment type variable first, balance effect size is 0.594. Second, muscle activities effect size is 0.425. Third, ADL effect size is 0.430. Fourth, equivalance effect size is 0.640. Fifth, GMFM effect size is 0.482. Sixth, gait effect size is 0.400 and seventh emotion effect size is 0.876. Conclusion: These findings is horseback riding is effective The effect size by outcome was observed to be the effective for children with developmental disabilities and neural patients. and also the horseback riding provided the positive effects of balance, muscle activities, ADL, equivalance, GMFM, gait, emotion for children with developmental disabilities and neural patients. It is hoped that this study will contribute to the development of effective treatments for children with developmental disabilities and neural patients therapeutic horseback riding and the development of study.

Effect of Basal Physical Fitness and ADL Function in the Aged According to Horse Riding Exercise (실내 승마운동이 고령자의 기초체력 및 ADL 기능에 미치는 효과)

  • Kim, E.R.;Kang, S.R.;Yu, C.H.;Moon, D.A.;Park, S.Y.;Kwon, T.K.
    • Journal of Biomedical Engineering Research
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    • v.34 no.4
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    • pp.163-169
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    • 2013
  • The purpose of this study was to verify exercise effect of horse riding exercise according to estimate basal physical fitness and activities of daily living(ADL) function in the aged. Participants were nineteen peoples who have no impediment of activity. They performed horse riding exercise using SRider(Neipplus, Co., Korea) at sixty minutes a day. Exercise has progressed three days a week for eight weeks. We measured trunk flexion, sit up, whole body reaction, leg strength and maximal oxygen uptake as basal physical fitness. Also three meter gait, single stance with eyes opened and single stance with eyes closed as ADL function were estimated once a month. The result of legs strength and whole body reaction showed the higher significantly than before the exercise. Moreover, the result of three meter walking ability only increased significantly among the ADL function. This means that horse riding exercise might be activated continuous muscular contraction with maintained tonus of muscle. We thought that continuous movement of horse riding could be lead to isometric muscle contraction in lower limbs. Our study found that horse riding exercise could improve lower strengths and muscle reaction for exercise effect. Also we suggested that horse riding exercise could be adapted to exercise methods that could provide rehabilitation and treatment enough for the aged or disabled person.

Relationship between the Degree of Participation in Leisure Activity, Organizational Identification and Organizational Commitment: With Emphasis on Bicycle Riding Club Members (생활체육 동호인의 여가활동 참가정도와 조직동일시 및 조직몰입의 관계: 자전거 동호인을 중심으로)

  • Lee, Yeon-Ju;Jeon, Min-Ju
    • The Journal of the Korea Contents Association
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    • v.12 no.12
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    • pp.427-438
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    • 2012
  • The purpose of this study was to investigate the relationship between the degree of participation in leisure activity, organizational identification and organizational commitment with the emphasis on bicycle riding club members. A total of 265 respondents were selected using the purposive sampling method. From the statistical analyses, three meaningful results were extracted. First, there were differences in the degree of bicycle riding participation, organizational identification and organizational commitment on the basis of individual background characteristics. Second, the age and the monthly income of riding club participants partly influenced the degree of bicycle riding participation, organizational identification and organizational commitment. Third, the degree of bicycle riding participation directly or indirectly had influences on organizational commitment mediated by organizational identification. As a result, we found the fact that beside the degree of bicycle riding participation, the age and the monthly income of riding club participants also have influences on organizational identification and organizational commitment.