• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.6
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• pp.1503-1509
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• 1994

An analysis method is suggested and experimentally studied in order to solve a vibration problem of a flexible structure while it is moving. In this method, substructure synthesis method, modal analysis method and Newmark's integral method were used. Total deformation of a structure was composed of quasistatic component and dynamic component. Rigid body modes were considered in calculation of dynamic component. Combining those two component, deformation behavior and a real structural model of a transfer feeder showed good agreements with computational results.

• Proceedings of the Optical Society of Korea Conference
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• 2000.02a
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• pp.158-159
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• 2000

광원의 근처에만 존재하는 근접장(Near-field)이 먼장(Far-field)과는 매우 다른 특성을 보인다는 것은 널리 알려진 사실이다. 일반적으로 먼장은 횡파(transverse wave)이며 광원에서 멀어질수록 1/r의 함수로 그 세기가 감소하는데 반하여, 근접장은 시간의존항을 제외하고는 정적인 분포를 보이고(static), 종파(logitudinal wave)성분이 오히려 크며 광원의 미세구조에 직접 관련되어 있다. 이러한 근접장이 근접장 주사 광학현미경(Near-field Scanning Optical Microscopy)의 발전으로 인해 실험적으로 연구되기 시작하면서 여러 가지 예기치 못한 현상들이 발견되고 있다. 그중 하나로서, 원편광된 빛(Circularly polarized light)을 내는 광원의 근접장을 측정한 실험에서 광원에 접근할수록 원편광이 사라지는 현상이 실험적으로 보고된바 있다.$^{(1)}$ 본 발표에서는 Bethe의 모델과 다중극 장(Multipole field)의 근접장을 분석하여 고전전자기론 내에서 근접장의 각 운동량에 대해 논의한다. (중략)

• Journal of the Korean Society of Physical Medicine
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• v.4 no.1
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• pp.23-30
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• 2009

Purpose : This study was investigated the effect of static balance recovery during open kinetic chain exercise (OKC) and closed kinetic chain exercise(CKC). Methods : The paticipants were consisted of forty-one, was perform 3 sets, 3 times per week for 6 weeks, balance was measured by GOOD BALANCE. Statistical analysis was used repeated measure two-way ANOVA and independent t-test. Results : In CKC group, Center of presure(COP) medial-lateral(ML) velocity was significantly increased post 6 week test than pre-test, post 2 week test. COP anterior-posterior(AP) velocity was significantly increased post 6 week test than pre-test (p<.05). Conclusion : It was found that both OKC and CKC was significantly increased balance recovery in normal younng adults. In further study, it was suggested that was regard patient with muscle weakness.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1992.11a
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• pp.50-56
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• 1992

공업재료의 표면은 수많은 돌기들로 구성되어 있으며 이러한 돌기들의 접촉으로 진실접촉이 이루어진다. 그러므로 마찰은 겉보기 접촉면적과는 무관하며 진실접촉면에서 일어난다. 표면의 한 돌기가 접촉면과 상대운동을 함으로 인하여 마찰열이 발생된다. 이러한 마찰에너지 발산의 결과로서 진실접촉면적 주위의 국부적인 표면 온도가 상승되며 따라서 표면의 평균온도가 상승된다. 이러한 표면온도를 결정하기 위한 이론적 및 실험적인 방법이 많이 제시되어왔다. 정적상태에서의 표면온도는 Block(1937)과 Jaeger(1942)에 의해 이론적으로 소개하였다. Jaeger는 열원의 위치와 상대적인 접촉운동 그리고 크기 및 경계조건 등의 특정한 조건 하에서 진실접촉점의 온도를 계산하였다. 이에 Bany와 Baber(1984)는 그들의 경계조건이 잘목 정의되었음을 지적하고 더욱 세분화된 경계조건으로 온도분포를 유도한 바 있다. Ling(1969)은 접촉점에서의 온도가 주변의 겉보기 접촉면적의 온도보다 훨씬 높다는 것을 수치해석으로 밝혀냈다. 본 연구는 고속정밀촬영기를 이용하여 진실접촉점에서 발생하는 Hot spot의 온도분포를 실험을 통하여 규명하고 그 결과를 Geoim과 Winer의 이론식에 적용하므로 식의 유용성을 검증하는데 그 목적이 있다.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.93-96
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• 2008

The near fault ground motion(NFGM) is characterized by a single long period velocity pulse of large magnitude. NFGM's have been observed in recent strong earthquakes, Turkey Izmit (1999), Japan Kobe(1995), Northridge(1994), etc. These strong earthquakes have caused considerable damage to infrastructures because the epicenter was close to the urban area, called as NFGM. Extensive research for the far fault ground motion(FFGM) have been carried out in strong seismic region, but limited research have been done for NFGM in low or moderate seismic regions because of very few records. The purpose of this study is to investigate and analyze the effect of near-fault ground motions on RC bridge piers without lap-spliced longitudinal reinforcing steels. The seismic performance of two RC bridge piers under near-fault ground motions was investigated on the shake table. In addition, Two of four identical RC bridge piers were tested under a quasi-static load, and the others were under a pseudo-dynamic load. The respectively two RC bridge pier is comparatively subjected to Pseudo-dynamic loadings and Quasi-Static loadings. This paper indicated that more gives bigger ultimate strain of longitudinal steels to be fractured at bigger PGA motion.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.6575-6583
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• 2015

The purpose of this study was to investigate the relationship among leisure constraints, athletic life satisfaction and self-control of student athletes at physical education high school. By using convenience sampling method of non-provability sampling, a total 217 students athletes from D and G city were selected. Of 217 copies of the questionnaire gathered, 35 were discarded owing to having excessive missing values. Thus by analysing a total of 182 surveys with structural equation modeling through SPSS 20.0 statistics program, this study found the followings. First, leisure constraints have a negative influence on athletic life satisfaction. Second, leisure constraints have a negative influence on self-control. Third, athletic life satisfaction has a positive influence on self-control.

• Journal of the Society of Naval Architects of Korea
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• v.30 no.3
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• pp.75-89
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• 1993

The present paper describes an application of UA(Uncertainty Analysis) to seakeeping model test, basically according to the Performance Test Code of ASME(American Society of Mechanical Engineers), in which all the possible error sources involved in the preparation of test, calibration of instruments, data acquisition and analysis are quantified, and summed up with error propagation coefficients to the final uncertainties. The differences between the static test such as resistance and propulsion test and the dynamic test like seakeeping test are clearly identified during all the procedures of UA and asymmetric bias errors are considered. The DRE(data reduction equation) subject to present UA are the heave and pitch response amplitude operator and nondimensionalized absolute frequency. The usefulness of UA in seakeeping test were confirmed not only for quantifying errors and improving measurement accuracy but also for the validation of various seakeeping analysis tools.

• Journal of Korea Entertainment Industry Association
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• v.14 no.2
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• pp.97-107
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• 2020

This Study designed to examine the effects of participation motivation of Dance Sports Activation. The dance sports club participants were selected by systematic stratifies cluster random sampling method. The questionnaire was given to 320 members of badminton club members and engaging in the range activity from March 2019 to April 2019. After collecting the questionnaires, I exclude 20 unreliable questionnaires which were incomplete, incorrectly marked or double marked, and used 300 questionnaires for the study. The conclusion of this research was as follows: First, Participation motivation had a effect on enjoyment factor in dance sports club participants. Second, Participation motivation had a effect on exercise dependence in dance sports club participants. Third. Enjoyment factor had a effect on exercise dependence in dance sports club participants. It was concluded that participation motivation would be beneficial for enjoyment factor and exercise dependence in dance sports club participants.

• Proceedings of the Korean Fiber Society Conference
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• 2003.10b
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• pp.142-144
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• 2003

3차원 apparel CAD system개발에 있어서 직물의 드레이프 모사가 걸림돌이 되어왔다. 최근 컴퓨터의 속도 개선으로 인해 정적 드레이프의 경우 데이블 보 문제와 같이 적절한 시간내에 드레이프 모사가 이루어지고 있다. 그러나 드레이프는 cloth와 body간의 충돌 검사에 많은 시간이 소요되므로 virtual fashion show와 같이 인체가 운동하는 동적 드레이프의 경우는 아직도 어려운 문제이다. (중략)

• Journal of the Korean Applied Science and Technology
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• v.36 no.4
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• pp.1268-1280
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• 2019

The purpose of this study was to investigate the effects of combined exercise on irisin, body composition and glucose metabolism in obese elderly women with type 2 diabetes mellitus. The subjects were thirty-six obese elderly women with type 2 diabetes volunteers, aged 65 to 85 years, composed of the combined exercise type 2 diabetes mellitus group (n=20) and non-exercise type 2 diabetes mellitus group (n=16). The 60 minute combined exercise program (outdoor walking exercise & elastic-band exercise) was performed 3 times per week for 12 weeks. Exercise intensity of outdoor walking exercise was performed as medium intensity (RPE 5~6) and elastic-band exercise was progressively increased every four weeks (1-4 weeks: OMNI-RES 3~4, 5-8 weeks: OMNI-RES 5~6, 9-12 weeks: OMNI-RES 7~8). The results of the study in the combined exercise type 2 diabetes mellitus group were as follows; Irisin and skeletal muscle mass had significantly increased (p<.001), percentage of body fat had significantly decreased (p<.001). Further, HbA1c (p=.020) and fasting glucose (p<.001) was significantly decreased, and HOMA-β was significantly increased (p<.001). Correlation results showed that change of irisin had a significant negative correlation between percentage of body fat mass (r=-.423, p=.010), HbA1c (r=-.351, p=.036) and fasting glucose (r=-.424, p=.010). Also, irisin changes showed a positive correlation with aerobic endurance (r=.355, p=.034) and HOMA-β (r=.411, p=.013). In conclusion, the practice of regular combined exercise was found to increase the level of irisin in elderly women with type 2 diabetes and have a positive effect on body composition changes. In addition, HbA1c, fasting glucose and insulin secretion was improved, which helped to regulate glucose metabolism. Walking exercise and elastic band exercise are recommended as effective exercise for the prevention and management of diabetes in obese elderly women with type 2 diabetes mellitus.