• Journal of Korean Society of Transportation
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• v.24 no.1 s.87
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• pp.53-58
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• 2006

The purpose of this study was to test the safety of the heel rest which was made for reducing the automobile driver's muscle fatigue with automatic transmission. Sixty subjects participated in the test, including ten males and ten females in 30s, 40s, 50s, respectively. Simulator consisted of automobile cockpit, accelerator and brake pedal sensor, heel rest. and driving displays. 30 seconds were given to subjects to be accustomed to the simulator environment. They also had one pre-trial to use the brake pedal according to the experimental scenario. They were told to step on the brake pedal immediately as soon as the red light was on the display The reaction time representing the foot travel time between accelerator and brake pedal was measured with/without the heel rest. In results, there was no significant difference in reaction time between conditions with/without heel rest. The result indicated that the heel rest used in this study would be a safe accessory for drivers who need to reduce the fatigue of the muscle or joint during driving.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1284-1287
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• 2012

본 논문에서는 트레드밀의 전원공급을 보조하는 압전소자를 이용한 자가발전형 트레드밀을 제안한다. 이를 위해 기존 트레드밀의 발판을 압전소자 발판으로 교체하고, 트레드밀의 발판에 발전된 전기를 저장하기 위한 충전지를 두며, 해당 발판의 압전소자를 이용하여 트레드밀에 재사용 할 수 있는 전원을 생산한다. 본 연구 결과로 트레드밀의 구동전력효율의 향상을 기대할 수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.12
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• pp.5950-5957
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• 2012

CPR with minimized hands-off time is one of integral factors for the improvement of the survival rate of patients. The purpose of this study was to examine the relationship of the installation of C-steps on the main stretcher to CPR accuracy and errors. The subjects in this study were 70 paramedics in 10 firehouses in the province of C(35 for control group, 35 for experimental group), and their CPR accuracy on the main stretchers was checked. As a result, it's found that the main stretchers equipped with the C-steps served to boost the accuracy of chest compression by creating suitable environments for that in terms of height and posture(t=65.104, p=.000), to improve the accuracy of artificial respiration by providing a proper amount of ventilation(t=5.207, p=.000), and to bolster the self-confidence of the paramedics about CPR(t=-10.612, p=.000). In conclusion, the mounting of C-steps on the main stretcher is expected to be of use for the improvement of the survival rate of cardiac-arrest patients by ensuring the precise performance of high-quality CPR.

• The Transactions of the Korean Institute of Power Electronics
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• v.24 no.6
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• pp.389-395
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• 2019

This paper presents the sensorless position control of an auxiliary scaffolding step system for vehicles using DC motors. The designed auxiliary scaffolding step has a mechanical protector at the stop position. At this position, the scaffolding is forcibly stopped by the mechanical protector, and the motor current is dramatically increased to the stall current of the DC motor, thereby increasing the electrical damage. In this study, the estimated back EMF- and current model-based observers are proposed to estimate the motor speed and stop position. A simple V/F acceleration voltage pattern is used to operate the auxiliary scaffolding system. The estimated moving position is adopted to determine the stop position of the DC motor with the load current state. The operating current of the DC motor can be reduced by the estimated moving position and V/F acceleration pattern. At the stop position, the proposed sensorless position controller can smoothly stop the DC motor with the estimated moving position and reduced load current without any mechanical and electrical stress from the stall current from the mechanical protector. The proposed control scheme is verified by the comparison of simulations and experiments.

• Journal of the Ergonomics Society of Korea
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• v.24 no.4
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• pp.55-62
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• 2005

This study examined the effect of ergonomic heel rest that was designed for drivers who have physical handicap in the low leg muscles or have to drive prolonged hours with frequent foot pedaling. An experiment was designed to test the ergonomic heel rest with traditional foot pedal. Forty subjects participated in the experiment. Electromyography(EMG) was used to monitor the muscle activity and fatigue of right leg, and Electro-goniometer was used to measure the ranges of motions of the knee and ankle. A simulator of driver's seat was built for the experiment and the heel rest was installed on it. In order to examine the low muscle activity and range of motion, subjects used the foot pedal for 15 minutes repetitively for each experimental condition. Another 15 minutes test without the heel rest was also performed for comparison. The Root Mean Square(RMS) and Mean Power Frequency(MPF) Shift were used to quantify the level of muscle activity and local muscle fatigue. In results, statistically significant decreases of muscle activity and fatigue were found in all the low leg muscles. The range of motion of the knee and ankle joint also decreased when the heel rest was used. The mechanism of the heel rest effect was discussed in this study. This type of heel rest can be applied to real driving situation after ensuring the safety, or overcoming the psychological discomfort possibly due to unfamiliarity.

• Journal of the Korean Society of Clothing and Textiles
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• v.25 no.10
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• pp.1791-1800
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• 2001

연구의 목적은 지체장애인들의 신체적 특성을 고려하여 움직이기 편하면서 외관이 보기 좋은 기능성 의복을 제작하는데 있다. 휠체어, 크러치를 사용하는 여성 장애인을 대상으로 쟈켓, 바지, 휠체어 랩을 제작하여 외관상 기성복과 차이가 나지 않으면서 보조기구를 사용하는데 불편함이 없는 디자인을 제시하였다. 연구의 결과는 다음과 같다. 첫째, 휠체어사용자 쟈켓은 어깨와 팔의 동작을 쉽게 하기 위해서 뒤 bodice 소매둘레부위에 artion pleats를 주었으며 팔꿈치 부위에 주름으로 처리하여 당김과 움직임을 수월하게 하였다. 바지는 허리선 위치를 수정하고 굽혀져 있는 무릎부위에 앞은 주름, 뒤는 다아트로 처리하였다. 둘째, 크러치 사용자는 전체적으로 외관이 올라간 것처럼 보이는 것을 막기 위하여 쟈켓 길이를 길게 하고 쟈켓 위에 조끼를 덧입은 것처럼 보이게 하였다. 바지의 허리선은 고무벨트를 달았으며 양쪽 옆트임을 하여 지퍼를 달았다. 셋째, 휠체어 랩은 방수와 방한을 대비하여 만든 옷으로 전체적인 외관이 롱 원피스 형이며 발부위에 사각형 발판을 만들어 바람이 들어오지 못하도록 하였고, 양쪽 옆 지퍼를 사용하여 여밈 처리하였다.

• Tuberculosis and Respiratory Diseases
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• v.45 no.4
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• pp.813-822
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• 1998

Background: Extubation is recommended to be performed at minimum pressure support (PSmin) during the pressure support ventilation (PSV). In field, physicians sometimes perform additional 1 hr T-piece trial to the patient at PSmin to reduce re-intubation risk. Although it provides confirmation of patient's breathing reserve, weaning could be delayed due to increased airway resistance by endotracheal tube. Methods: To investigate the effect of additional 1 hr T-piece trial on weaning outcome, a prospective study was done in consecutive 44 patients who had received mechanical ventilation more than 3 days. Respiratory mechanics, hemodymic, and gas exchange measurements were done and the level of PSmin was calculated using the equation (PSmin=peak inspiratory flow rate $\times$ total ventilatory system resistance) at the 15cm $H_2O$ of pressure support. At PSmin, the patients were randomized into intervention (additional 1 hr T-piece trial) and control (extubation at PSmin). The measurements were repeated at PSmm, during weaning process (in cases of intervention), and after extubation. The weaning success was defined as spontaneous breathing more than 48hr after extubation. In intervention group, failure to continue weaning process was also considered as weaning failure. Results: Thirty-six patients with 42 times weaning trial were satisfied to the protocol. Mean PSmin level was 7.6 (${\pm}1.9$)cm $H_2O$. There were no differences in total ventilation times (TVT), APACHE III score, nutritional indices, and respiratory mechanics at PSmin between 2 groups. The weaning success rate and re-intubation rate were not different between intervention group (55% and 18% in each) and control group (70% and 20% in each) at first weaning trial. Work of breathing, pressure time product, and tidal volume were aggravated during 1 hr T-piece trial compared to those of PSmin in intervention group ($10.4{\pm}1.25$ and $1.66{\pm}1.08$ J/L in work of breathing) ($191{\pm}232$ and $287{\pm}217$cm $H_2O$ s/m in pressure time product) ($0.33{\pm}0.09$ and $0.29{\pm}0.09$ L in tidal volume) (P<0.05 in each). As in whole, TVT, and tidal volume at PSmin were significantly different between the patients with weaning success ($246{\pm}195$ hr, $0.43{\pm}0.11$ L) and the those with weaning failure ($407{\pm}248$ hr, $0.35{\pm}0.10$L) (P<0.05 in each). Conclusion : There were no advantage to weaning outcome by addition of 1 hr T-piece trial compared to prompt extubation to the patient at PS min.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.851-860
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• 2020

With an increase in the aging population and a rising social interest in health and welfare, studies to improve healthcare in the elderly are being actively conducted. This study attempted to improve the current design and manufacture of elevating electric wheelchairs to enhance user safety and convenience. Seat design based on the user's body shape, convenience while boarding or alighting, caster turning radius and, safety and stability features that prevent shaking when the user gets up or sits down were improved. A driving experiment was conducted to evaluate the operation of the indoor electric wheelchair designed and manufactured with these additional functionalities. During the test, the performance parameters evaluated were continuous driving time, turning radius, maximum lifting and lowering load, maximum lifting height, noise level, minimum distance sensing by the driving auxiliary sensor, ability to interact with server and app programs, and the duty cycle maximum error rate. The test confirmed that this improved electric wheelchair successfully met target parameters. In a future study, we will evaluate this improved electric wheelchair from a user's perspective for its usability parameters, such as satisfaction, convenience and stability.

• 한국체육학회지인문사회과학편
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• v.56 no.6
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• pp.71-80
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• 2017

The purpose of this study was to explore meaning and training experience of Kendo participants by qualitative research. For this purpose, the results of the study were obtained from 11 male and female subjects practicing in the Kendo area of Busan Metropolitan City. In order to elucidate the results of the study, in - depth interviews and related supporting data were collected and the data collected through text analysis were analyzed. As a result, the training experience of Kendo participants has formulated in three respective aspects and the result of such study is shown comprehensively as follows. The Kendo participants consider that the Kendo training would be the continuance of one's own fight and the process to overcome such would be an occasion to enhance the sense of pride for the trainees. Not only in Kendo training but also in ordinary living, this experience displays the foundation to overcome when one encounters the limitations within. Under this process, what is important to the Kendo trainees would be manner. The first thing learned in the Kendo training center is manner and manner is the most important virtue to be equipped for the Kendo trainers. Furthermore, Kendo has the strength to advance righteous personal traits through the physical activities. Lastly, those participants that are equipped with the qualification as the master through long period of training have profound training of Kendo in order to be equipped with the competency as the master and this experience has prepared the turning point to be advanced as true and genuine Kendo men.