• Journal of the Korean Society of Costume
• /
• v.56 no.2 s.101
• /
• pp.101-111
• /
• 2006

The purpose of this research is to define body shapes of Plus-sized women at ages between 21 and 69 whose satisfied the Plus-sized judgment criteria took part in this study. This research also classifies different body types, and provides basic data for designing prototypes according to each body type. Based on factor analysis of the measured data, nine key factors are grouped. And four different body types are classified based on the cluster analysis using factor marks. Type 1 refers to those who are tall and characterized by 'Y' body shape when looked from the front. Looking from the side, this type is comparatively balanced obese type which has flat breast and abdomen, and which has a jutting back and buttocks. Type 2 refers to those who are the shortest of all the obese with 'X' front. This type is Sway-back shape which has jutting back and abdomen but flat buttocks when looked from the side. Type 3 is characterized by 'H' body shape when looked from the front. This type is Pway-back shape which has flat back, abdomen and buttocks when looked from the side. The prominent breast part of this type is the most outstanding figure. Type 4 is characterized by 'X' when looked from the front. This type has a jutting waist and prominent buttocks when looked from the side.

• Journal of the Korea Institute of Building Construction
• /
• v.9 no.5
• /
• pp.145-153
• /
• 2009

The purpose of this research is to compare and analyze the change that must be applied to the evaluation of the slipperiness of an inclined floor, when considering its use by the physically handicapped and by the able-bodied. For this study, a simulator that can reproduce the characteristics of the body sway of a physically handicapped person was developed through a comparative experiment between able-bodied people and people with hemiplegia. In addition, as cale for the evaluation of the slipperiness of flat floors and inclined floors was composed by the sensory test result targeting physically handicapped persons (able-bodied persons wore the body sway for the handicapped and ageing in the experiment) and the able-bodied. In terms of the evaluation of the slipperiness of an inclined floor, it was evaluated that it is safe when the C.S.R' (Coefficient of Slip Resistance) of a healthy person is over 0.30, while it was evaluated that it is dangerous when the C.S.R' of a physically handicapped person is over $0.45{\sim}0.50$. Concerning this difference, it is judged that the reason for this difference is that the walking mechanism differs between an able-bodied person and a physically handicapped person.

• Journal of rehabilitation welfare engineering & assistive technology
• /
• v.5 no.1
• /
• pp.47-52
• /
• 2011

The functional loot orthoses, when wearing shoes, are in the direct contact with bottom of foots to improve and recover the correctness of abnormal lower limb musculoskeletal imbalance and the primary role of foot and also, it can act to keep the balance and weight of body and support the weakened region, so that it is very helpful to keep body balance for the standing position. In this paper, it was researched that foot orthoses which is accommodable for the function of impact absorption including the gait stability affect on the balanced performances of body in according to the formation and the material of foot part. Taking into account the balanced performances by using the sway velocity, the estimation and comparison of the effects on the balanced performances by each formation and material for foot orthoses was evaluated into significant values(p<0.006) in only the eye-opening posture with Firm state, In this posture, the static process performed by each foot formation reveals in order of normal foot(p<0.010), flat foot(p<0.000) and hollow foot(p<0.003) and then, on the base of each formation of foot part, the result that analyze the effects of the materials of foot orthoses on the balance performance appeared showing that soft materials is more effective on the normal foot and, on the other hand, rigid materials is more effective in balancing on flat foot and hollow foot.

• Journal of Ocean Engineering and Technology
• /
• v.25 no.2
• /
• pp.36-46
• /
• 2011

A two-dimensional floating body with a moon pool under forced heave motion, including a piston mode, is numerically simulated. A dynamic CFD simulation is carried out to thoroughly investigate the flow field around a two-dimensional moon pool over various heaving frequencies. The numerical results are compared with experimental results and a linear potential program by Faltinsen et al. (2007). The effects of vortex shedding and viscosity are investigated by changing the corner shapes of the floating body and solving the Euler equation, respectively. The flow fields, including the velocity, vorticity, and pressure fields, are discussed to understand and determine the mechanisms of wave elevation, damping, and sway force.

• Journal of the Korean Society of Safety
• /
• v.17 no.2
• /
• pp.22-31
• /
• 2002

In present study, the deformation analysis and automotive body repair were analyzed with respect to collision types by case studies. As a result, lots of data for the automobile frame deformation caused by collision were collected and analyzed according to collision types. It was shown from the result that the frame deformation patterns were able to be roughly grouped by collision positions of vehicles. Repair plans of deformed frames could be carried on the measured data. It was shown that the deformed vehicle frames were sufficienty repaired to be normal in driving characteristics from the performance test of repaired vehicles.

• Journal of Biomedical Engineering Research
• /
• v.31 no.3
• /
• pp.210-216
• /
• 2010

This study is vestibular electric stimulation applied between the mastoids during quiet standing elicits postural sway. The aim of this study was to characterize the postural sway response to continuous sinusoidal vestibular electric stimulation across various stimulus frequencies and amplitudes. Binaural bipolar sinusoidal vestibular electric stimulation was applied to the skin overlying the mastoid processes of 10 subjects while they stood on a force plate. The position of the center of pressure(COP) and signals at the feet are obtained on an force plate, while the head and whole body center of mass(COM) was measured with motion analysis system. The stimulus conditions included eight frequencies (1/64, 1/32, 1/16, 1/8, 1/4, 1/2, 1, and 2Hz) and six peak amplitudes (0.1, 0.25, 0.5, 0.7, 1 and 2mA). Each subject experienced one trial at each amplitude-frequency pair. The stimuli elicited sway in lateral plane in all subjects, as evidenced by changes in the stimulus frequency. Our results demonstrate that the vestibular system is sensitive to vestibular electric stimulation intensity changes and responds by altering the magnitude of the response accordingly.

• Science of Emotion and Sensibility
• /
• v.5 no.4
• /
• pp.45-49
• /
• 2002

Recently, virtual environment systems are used in various application fields such as industry, medicine, and training and education. However, the negative effect, cybersickness including nausea, visual fatigue, and disorientation, could be happened while using VR systems. It prevents VR system from spreading much more. To control the cybersickness, first of all, the objective measurement method should be established. As one of alternative methods, the postural instability could be a measure of cybersickness. In this study, 45 participants' postural sway before and after experiencing a H driving simulator was measured by using a force platform. Especially, we examined if two factors, motion and feedback, could affect on the postural instability The results showed the postural instability slightly increased after experiencing the VR driving simulator. For the factors, the providing of motion synchronized to visual display showed statistical significant decrease in postural sway along lateral side. To check the effectiveness of postural instability as a cybersickness measure, further studies are needed.

• Journal of the Korean Society of Physical Medicine
• /
• v.8 no.2
• /
• pp.193-200
• /
• 2013

PURPOSE: The purpose of this study was to find out variations in body posture by using the baby carrier at the front side and back side. METHODS: Thirty two healthy and young female who will bring up infants and had no musculoskeletal disorders of neck, lumbar and low limb were recruited for this study. They were each marked about ears of tragus, cervical 7th, acromion anterior end, anterior superior iliac spine, posterior superior iliac spine, greater trochanter and lateral malleolus as landmarks to measure variations of body posture when they carry infants at the front side and back side. Landmarks were regarded as the creteria in order to measure NeckFlexion angle(NF), Foreward shoulder angle(FSA), Pelvic tilt(PT), Sway angle(SA), Head displacement(HD) and Scapular displacement(SD). Variations in body posture were measured from the neutral position to the front and back side by using Image J. RESULTS: There were significance level (p<.05) in NF, PT, SA, HD and SD except for FSA in two different side. CONCLUSION: The results of this study indicate that each of the using ways of baby carrier for baby care was influenced postural responses of young women. therefore, it could be considered to apply to women who have abnormal body posture in order to minimize musculoskeletal disorders.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.10a
• /
• pp.1160-1165
• /
• 2004

The purpose of this study was to calculate three dimensional angular displacements, moments and joint reaction forces of the ankle joint during the waist pulling, and to assess the ankle joint reaction forces according to different perturbation modes and different levels of perturbation magnitude. Ankle joint model was assumed 3-D ball and socket joint which is capable of three rotational movements. We used 6 cameras, force plate and waist pulling system. Two different waist pulling systems were adopted for forward sway with three magnitudes each. From motion data and ground reaction forces, we could calculate 3-D angular displacements, moments and joint reaction forces during the recovery of postural balance control. From the experiment using falling mass perturbation, joint moments were larger than those from the experiment using air cylinder pulling system with milder perturbation. However, JRF were similar nevertheless the difference in joint moment. From this finding, we could conjecture that the human body employs different strategies to protect joints by decreasing joint reaction forces, like using the joint movement of flexion or extension or compensating joint reaction force with surrounding soft tissues. Therefore, biomechanical analysis of human ankle joint presented in this study is considered useful for understanding balance control and ankle injury mechanism.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.9 no.8
• /
• pp.1722-1729
• /
• 2005

In this paper, we used the quadruped walking robot Titan-VIII in order to carry out this simulation of sway compensation trajectory. The attitude angle ${\phi}_r$ and ${\phi}_p$ is obtained from 3-D motion sensor that is attached at the center of robot body and the attitude control carried out at every 10[ms] for stable gait of robot. Duty factor, that is fixed at 0.5. When we change period T into 1.5, 2.0, 3.0[sec] each and moving distance per period is changed into 0.2, 0.3(m), we sim띠ate several walking experiment of robot. and then we analyze the experiment results if there are any difference between the imaginary ZMP and actual ZMP of robot and the stable gait of robot is realized.