• 한국응용과학기술학회지
• /
• 제38권6호
• /
• pp.1512-1523
• /
• 2021

본 연구의 목적은 남자 테니스 선수의 생맥산 섭취가 혈중 지질 및 동맥경화 지수에 미치는 영향을 조사하는 것이었다. 남자 대학 테니스 선수 17 명을 4 주간의 고강도 테니스 하계훈련 중 생맥산 섭취 여부에 따라 생맥산 섭취군(n=9)과 위약 대조군(n=8)으로 나누었다. 테니스 하계훈련은 4 주간 주 5 회 실시하였으며, 운동강도는 예비심박수의 70~90%로 실시하였다. 생맥산은 아침 식사 전, 운동 중, 운동 중, 운동 후 1 회 110ml, 저녁 식사 후 1 일 총 7 회 770ml 를 섭취하였다. 모든 데이터에 대해 평균 및 표준 편차를 사용하였으며, 시기간 및 생맥산 섭취그룹의 효과를 확인하기 위하여 반복측정분산분석법을 사용하였고, 생맥산 섭취 후 혈중 지질의 차이에 대한 관련성을 알아보기 위하여 Pearson 의 상관분석을 실시하였다. 본 연구결과, 생맥산 섭취군은 혈중 지질(중성지방, 총콜레스테롤, 고밀도지단백콜레스테롤, 저밀도지단백 콜레스테롤)과 동맥경화지수가 유의하게 개선되었으며, ∆TG, ∆LDL 및 ∆TC 간에는 유의한 상관관계가 나타났다. 결론적으로 남자 대학 테니스 선수의 고강도 트레이닝 시 생맥산 섭취는 혈중 지질 및 동맥경화 지수에 긍정적인 영향을 미칠 수 있어 운동 보조제로서 효과적인 스포츠 음료가 될 수 있음을 시사한다.

• Structural Engineering and Mechanics
• /
• 제39권6호
• /
• pp.751-765
• /
• 2011

The present paper deals with the identification of a concentrated damage in an elastic parabolic arch through the minimization of an objective function which measures the differences between numerical and experimental values of static displacements. The damage consists in a notch that reduces the height of the cross section at a given abscissa and therefore causes a variation in the flexural stiffness of the structure. The analytical values of static displacements due to applied loads are calculated by means of the principle of virtual work for both the undamaged and damaged arch. First, pseudo-experimental data are used to study the inverse problem and investigate whether a unique solution can occur or not. Various damage intensities are considered to assess the reliability of the identification procedure. Then, the identification procedure is applied to an experimental case, where displacements are measured on a prototype arch. The identified values of damage parameters, i.e., location and intensity, are compared to those obtained by means of a dynamic identification technique performed on the same structure.

• 대한산업공학회지
• /
• 제42권1호
• /
• pp.30-37
• /
• 2016

A multi-server queueing system with an infinite buffer and impatient customers is analyzed. The system operates in the finite state Markovian random environment. The number of available servers, the parameters of the batch Markovian arrival process, the rate of customers' service, and the impatience intensity depend on the current state of the random environment and immediately change their values at the moments of jumps of the random environment. Dynamics of the system is described by the multi-dimensional asymptotically quasi-Toeplitz Markov chain. The ergodicity condition is derived. The main performance measures of the system are calculated. Numerical results are presented.

• 한국환경과학회지
• /
• 제18권8호
• /
• pp.825-831
• /
• 2009

A first step review is completed on the suitability of European designed wind turbines in an East Asia climate. Six parameters are chosen for detailed analysis of proper meteorological measures from flat, hilly, forested, coastal and offshore sites in West Europe and East Asia: mean wind speed, 10 minute mean wind speed distribution, turbulence intensity, wind shear, 3 second extreme wind speed and 10 minute direction change. All six parameters are assessed with a view for contrast with the wind turbine design standard IEC61400. The diurnal and seasonal variation, average and extreme values of each parameter are calculated where appropriate. Industry standard software and analysis techniques have been employed to assess the applicability of existing wind turbine design standards and design guidelines for the East Asian market.

• 소음진동
• /
• 제10권2호
• /
• pp.240-246
• /
• 2000

One of the widely accepted methods for evaluating the interior sound quality of automobiles is Articulation Index(AI). The AI actually measures the articulation level of the sound in the vehicle cabin as passengers talk to one another. In this study, the effect of two different absorption materials inside the cabin on AI has been investigated by ray-tracing method : one is firewall, the other is celling. It turns out that the back seat location is found to be strongly dependent on the type of absorption materials treated at the celling, since the sound absorbing area is different due to the location and the firewall is situated in the "Reverberation Radius". The proposed methdo could be used to improve the sound quality of automobiles at the design stge.sign stge.

• 상하수도학회지
• /
• 제26권6호
• /
• pp.735-745
• /
• 2012

Storage method is one of major measures for reduction of CSOs pollutant loads and several projects have been done nationwide. But systematic analysis of intercepting capacity has not been studied to determine optimum size of storage facility. In this research, not only storage volume but also intercepting capacity which means flow capacity from intercepting facility to CSOs storage facility was studied and optimum sizing method for storage facility was proposed. The result shows that pollutants reduction efficiency can be increased significantly by increasing intercepting capacity and it might reduce storage volume and total construction costs. Intercepting capacity for the study area was evaluated and it was shown as equivalent to 83 % probability rainfall intensity.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 2002년도 학술발표회 발표논문집
• /
• pp.33-36
• /
• 2002

The purpose of this study is to develope a indicator for agricultural water use. Agricultural water is challenged by the increase of water use in the sectors of urbanization and industry and social pressure to use water in sustainable and environmentally sound way. The development of agricultural environment indicators is divided into 13 sectors, among which agricultural water use indicators include amount and intensity of agricultural water use, efficiency of agricultural water use, shortage or surplus of water use, water stress, etc.. Agricultural water use indicators provide basic data for sustainable and environmentally sound agricultural development, and also help policy decision makers to solve water shortage problems through water policy and water management measures by making the most of the total available water resources.

• Journal of Advanced Marine Engineering and Technology
• /
• 제28권7호
• /
• pp.1111-1122
• /
• 2004

An idea to suppress the self-excited combustion oscillation was applied to the flames. The characteristics of unsteady combustion were examined and the unsteady combustion was driven by forced pulsating mixture supply that can modulate its amplitude and frequency. The self-excited combustion oscillation having weaker flow velocity fluctuation intensity than that of the forced pulsating supply can be suppressed by this method. The effects of the forced pulsation amplitude and frequency on controlling self-excited combustion oscillations were also investigated comparing with the steady mixture supply. The unsteady combustion used in this experiment plays an important role in controlling self-excited combustion oscillation. Symptoms of self-excited combustion oscillation were also studied in order to predict the onset of combustion oscillation before it proceeded to a catastrophic failure For the purpose, the unique measures to observe the onset of self-excited combustion oscillations based on the careful statistics of fluctuating properties in flames, such as pressure or emission of OH radicals, have been proposed.

• 대한안전경영과학회지
• /
• 제16권3호
• /
• pp.273-277
• /
• 2014

Subcontracting business than the contracting business in shipbuilding industry is a lot of hazardous job and highly accident because of highly work intensity. In order to prevent the accidents, there is a need to analyze characteristic. of shipbuilding, to apply measures of risk assessment. In this paper, I suggested an improvement of the risk assessment through the actual condition research in shipbuilding industry. In the research method, I analysed accidents occurred until 2011-2013. Carried out the actual site survey while two weeks in May 2014. As a result, 1) The main pattern were caught-in or between, fall on the high level according to analyzed accidents. 2) To apply the weight show clear of magnitude for risk assessment. 3) Risk estimation of risk assessment is desirable to be quantization by accidents analysis, and to be greater than or equal to 4 steps.

• 수산해양교육연구
• /
• 제28권1호
• /
• pp.118-126
• /
• 2016

The purpose of this study is for old-aged women to analysis variation of Body composition and BMD so that help to keep healthy life by doing low-intensity workout. the subjects for this study consist of 20 persons being aged over 65 women, doing not regular workout, living in P metropolitan, and do workout for 12 weeks by catergorizing into 2 groups in half depending upon whether doing workout or not. Two-way Repeated Measures ANOVA of SPSS 18.0 was used for data processing. the statistical significant is set as p<.05. In result, there's none of dramatical difference in radius, ulna's BMD. there is dramatical difference in (%)Fat, WHR in workout group but none difference in LBM.