• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 춘계학술대회 논문집
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• pp.399-403
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• 2002

The transmission system of high speed train serve in the severe condition compared with those of other trains, namely, they have to transmit high power to run with high speed and they have to make maximum use of the limited space. To clarify the strength of gear for Korea High-Speed Train, a bending fatigue test of gear specimen is performed and compare with actual gear's. From this result, specimen test is useful to infer S-N curve and endurance limit of actual gear that much time and expense are consumed.

• 한국임상수의학회지
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• 제30권6호
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• pp.449-452
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• 2013

본 연구는 제주산마의 hill test 및 운동 강도별 심폐지구력 측정으로 승용능력 평가를 위한 기초 자료로 활용하기 위해 수행하였다. 분석에 이용된 제주산마 9두는 경사도 30도 내외의 경사로 800 m를 주행하는 hill test를 실시하였으며, 이 중 6 두는 운동 강도별(moderate, heavy, very heavy) 심폐지구력을 측정하였다. Hill test 주행시간은 평균 205 초였으며, 개체간 편차는 큰 것으로 확인 되었고, moderate exercise와 높은 상관관계를 보였다. 운동 강도별 평균 심박수는 유의적인 차이가 없었으나, 개체간 평균 심박수는 차이가 큰 것으로 나타났다. 회복 심박수는 heavy exercise와 very heavy exercise에서 높은 상관관계를 확인할 수 있었다. 본 실험결과, 운동 강도별 평균 심박수 차이는 확인 할 수 없었으나, 개체간의 차이는 큰 것으로 확인되었다.

• Tribology and Lubricants
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• 제15권1호
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• pp.108-115
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• 1999

The electrical and frictional properties of oil-impregnated sintered-metal bearing (OSB) and herringbone-grooved fluid bearing (HFB) with varying loads and speeds were measured. OSB shows very good performance up to 20,000 rpm and 0.05 N, and HFB successfully works up to 35,000 rpm and 0.05 N. From the endurance tests on start-stop and continuous operation, it was confirmed that those bearings could be mass-produced fur use on scanner motor in a laser scanner unit.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.817-820
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• 2006

The Tonpilz transducer is one of the essential elements in active sonar application. The characteristics of transducer depend on the piezoelectric ceramics and mechanical elements such as head mass, tail mass, pre-stress rod and so on. One of the important characteristics is electric and mechanical stability of transducer for long term high power transmitting operation. This parer presents the results about long term endurance tests of the underwater acoustic transducer.

• 한국항공운항학회:학술대회논문집
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• 한국항공운항학회 2015년도 추계학술대회
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• pp.55-58
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• 2015

고고도 장기체공 무인기는 일반적인 무인기와 달리 고고도에서의 환경과 장시간의 체공에 따른 위험도가 높을 수밖에 없다. 따라서 신뢰도를 높이기 위한 다양한 방안을 강구해야 한다. 가장 중요한 요소 중 하나가 비행제어시스템이며, 본 논문에서는 비행제어시스템의 이중화에 따른 설계결과와 비행시험결과를 기술하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 추계학술대회 논문집
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• pp.106-108
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• 1997

In this paper, the breakdown strength of Pure HDPE(High density polyethylene) films and aged HDPE films were evaluated using 2-parameter Weibull distribution function. The result show that both were fitted 2-parameter Weibull distribution. This method could be used to be the diagnostic tool to evalute the insulation performance and endurance under the multiple stresses.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 C
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• pp.1159-1161
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• 1995

The pure PTFE nozzles may not be used in the GCB with very high interrupting capacity because of their excessive ablation and carbonization. But it is known that the nozzles with filler can show good performances at the extremely high inetrrupting currents of 50kA or 63kA. So, the manufacturing process of filled Teflon has been carefully studied. Then several specimens have been prepared for the experiments and analyses of their mechanical and electrical characteristics. Finally the high power arc tests have been conducted to the Teflon nozzle with filler of $Al_2O_3$. The results of experiments and tests show that the filled Teflon nozzle has superior mechanical characteristics, comparable electrical characteristics to a pure Teflon nozzle and a distinguished endurance against high power arcs.

• International Journal of Aeronautical and Space Sciences
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• 제7권1호
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• pp.99-105
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• 2006

In this study, nonlinear static and dynamic aeroelastic analyses for a high-aspect-ratio wing have been performed. To achieve these aims, the transonic small disturbance (TSD) theory for the aerodynamic analysis and the large deflection beam theory considering a geometrical nonlinearity for the structural analysis are applied, respectively. For the coupling between fluid and structure, the transformation of a displacement from the structural mesh to the aerodynamic grid is performed by a shape function which is used for the finite element and the inverse transformation of force by work equivalent load method. To validate the current method, the present analysis results of a high-aspect-ratio wing are compared with the experimental results. Static deformations in the vertical and torsional directions caused by an angle of attack and gravity loading are compared with experimental results. Also, static and dynamic aeroelastic characteristics are investigated. The comparisons of the flutter speed and frequency between a linear and nonlinear analysis are presented.

• 대한물리치료과학회지
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• 제8권1호
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• pp.745-758
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• 2001

The purpose of study to phenomenological examine and the mechanism regarding the gene(DNA, RNA, Protein) and sports to studied, analyzed. and evaluated. This review considers the evidence for genetic effects in several determinants of endurance performance and resistance performance, namely: body measurements and physique, body fat pulmonary functions, cardiac and circulatory functions, muscle characteristics. substrate utilization, maximal aerobic power and other. Moreover, the response to aerobic training of indicators aerobic work metabolism and endurance performance is reviewed, with emphasis on the specificity of the response and the individual differences observed in training ability. This study indicate that improvement of 'Enhancer Action' in RNA genes changed by exercise or sports. Moreover exercise was effect on Central Dogma with DNA makes RNA makes Protein. and think that occurred with exercise influence on skeletal muscle into cell have to Myosin Heavy Chain (MHC) changed was after exercise performance, which accompanied into skeletal muscle that were exercise-induces gene-modulation that is, take gene mutations. This study known that existed hormone(epinephrine)-immune system with interaction. Exercise were altered insulin binding and MAP Kinase signaling increased into immune cells. This review suggested that the high rate of glutamine utilization by cells of the immune system serves to maintain a high intra cellular concentration of the intermediates of biosynthetic pathways such that optimal rates of DNA, RNA and protein synthesis can be maintained. In the absence of glutamine, lymphocytes do not proliferate in vitro: proliferation increase greatly as the glutamine concentration increase. Glutamine is synthesized in skeletal muscle. Skeletal muscle and plasma glutamine levels are lowered by sepsis, injury, bums, surgery and endurance exercise and in the overtrained athlete. The study of result show that production of ET-1 is markedly increased tissue specifically in the heart by exercise without appreciable changes in endothelin-converting enzyme and endothelial receptor expressions, suggest that myocardial ET-1 may participate in modulation of cardiac function during exercise. Conclusionally, this study indicate that improvement of 'Enhancer Action' in RNA genes changed by exercise or sports. Moreover exercise was effect on Central Dogma with DNA makes RNA makes Protein. This study is expected to contribute the area of sports science, medicine, hereafter more effort is required to establish the relation between gene alters and exercise amount.

• 디지털융복합연구
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• 제16권6호
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• pp.407-416
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• 2018

본 연구는 고등학교 엘리트 카약 선수들의 등속성 근기능, 균형성, 유연성, 신체 조성 등을 검사 및 진단하여 선수들의 경기력 향상과 부상 예방을 위한 훈련 방법론에 대한 조언을 하고자 실시되었다. 11명의 선수들을 대상으로, Biodex system IV, Biodex stabilizer system, Inbody 3.0, CNP-5403을 사용하여 근기능(peak torque, average power, work fatigue) 동적 균형 신체 성분 유연성 검사를 하였다. 선수들의 BMI 평균은 $22.57kg/m^2$, 체지방률은 10.90%, 체전굴은 16.95cm, 밸런스 점수는 좌우 각각 1.55, 1.49로 나타났다. S4, S5, S8, S10, S11은 어깨 근력과 파워 훈련이, S5, S6, S10, S11은 어깨 근지구력 훈련이 필요한 것으로 평가되었다. S5, S7, S8, S10, S11은 무릎 근력과 파워 훈련이, S1, S4, S5, S10은 무릎 근지구력 훈련이 요구되었다. S3, S10, S11은 손목 근지구력 강화 훈련이 필요했다. 추후 근기능 불균형으로 인한 경기력 저하와 잠재적 부상의 위험을 줄이기 위해선 획일화된 근력 훈련 프로그램을 지양하고, 정기적인 근기능 검사와 함께 개인별로 특화된 훈련 프로그램을 수립해야 한다.