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Mini-Trampoline운동중 인체가 받는 중력가속도의 변화
(Dean, Ward),주영은(Choo, Young-Eun) 대한생리학회 1982 대한생리학회지 Vol.16 No.2
수직뛰기 운동을 위한 mini-trampoline은 운동중 인체에 미치는 중력가속도를 변화시킴으로써 그 효과를 나타낸다고 하므로, mini-trampoline 운동중에 피검자가 받는 중력가속도를 다음과 같은 방법으로 측정하였다. 피검자로 하여금 mini-trampoline상에서 최대의 높이로 수직뛰기를 반복시키고, 그 뒷벽에는 3인치 간격의 눈금을 표시하여 뛰는 높이를 알 수 있게 하였다. 수직뛰기를 하는 동안에 super-8 mm 영사기로 초당 48 frames의 속도로 촬영한 후 각 frame에 나타난 피검자의 두정부 높이를 알아내었다. 수직뛰기하는 동안 시간에 대한 머리높이의 면화를 graph에 그려서 상승뛰기 운동시의 최대속도를 계산하였다. 이 결과로 부터 Arizona State University의 Crash Survival Investigator s School에서 고안한 다음의 공식을 사용하여 중력가속도(G)를 계산하였다. G=0.7854·V<sup>2</sup> / 32.2S V= 상승운동시 나타난 최대속도 (fps) S = 하강운동시 정지거리 (ft) 본 연구에서 V는 약 9fps 였고, S는 0.61 ft 였으며 따라서 G는 3.24+G<sub>z</sub>였다. 인체가 친밀 수 있는 증력가속도의 한계가 +G<sub>z</sub>방향으로 0.1초동안 20G이며 -G<sub>z</sub>방향으로 0.1초 동안 15G임을 고러할 때 mini-trampoline운동으로써 얻을 수 있는 중력가속도는 인체에 유해할 만큼 큰 것이 아니라는 것을 알 수 있다. It has been hypothesized that the effectiveness of the popular mini-trampoline as a conditioning device is due to the increased gravitational forces which are imparted to every cell in the body during its use. This study evaluated a means of determining the acceleration forces on a subject using a minitrampoline. By cinematic evaluation, a plot of the changes in distance over time was obtained. Using the formulas developed at the Arizona State University Crash Survival Investigators School, the maximum acceleration forces were determined to be approximately 3.2+G<sub>z</sub>.
Dean J. Ouellette 인하대학교 국제관계연구소 2019 Pacific Focus Vol.34 No.3
As part of its past “Look East” and now “Act East” policies, India seeks to increase the radius of its influence beyond South Asia by broadening relations with East Asian actors, including South Korea. New Delhi and Seoul continue to promote economic cooperation and explore ways to deepen their strategic partnership. However, for relations to grow substantively and enduringly, both will have to show greater concern, creativity, and caution—especially bearing in mind their mutual neighbor, China. This article explores how, through harnessing its unique longstanding relations with both Koreas and investing in non‐realist approaches resonant of people‐centered engagement, India as a middle power with major power aspirations can lay its footprint softly in Northeast Asia by playing a more pro‐active role to bolster and sustain inter‐Korean rapprochement and peacebuilding efforts.
Abstract : The Power and Limitations of Synchrotron X-rays in Agro-Environmental Research
( Dean L Hesterberg ) 한국환경농학회 2012 한국환경농학회 워크샵자료 Vol.2012 No.2
High-intensity synchrotron x-rays provide some of the most advanced analytical tools for studying soils. Nevertheless, the extreme complexity of soils across all spatial scales - from landscapes to molecules - challenges our ability to use these advanced measurements in management decisions that optimize crop nutrition while protecting the environment. This presentation will introduce the technique of synchrotron x-ray absorption spectroscopy, and discuss its advantages for analyzing chemical species of trace elements (and nutrients) in soils, and its limitations for such complex systems. Synchrotron x-ray absorption spectroscopy provides chemical-speciation information about average oxidation states and average local molecular coordination environments of individual soil elements, even at part-per-million concentrations. However, in such complex matrices, the specificity of the technique is lost because of the large number of possible (and measured) chemical species present. Technological advances have provided spatially resolving x-ray microprobes that can be applied at smaller and smaller (submicron) spatial scales, which is advantageous for identifying a subset of chemical species within heterogeneous subunits of soils (microsites). A new concept of soil chemistry - the reactive microsite model - proposes that chemical speciation and chemical microenvironments must be understood to predict reactivity. Future developments of chemical-specific analytical tools with high spatial resolution provide opportunities for experimentally assessing real-time transformations of environmental contaminants within soil matrices.
Dean Price,Andrew Maile,Joshua Peterson-Droogh,Derreck Blight 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
Large-scale reactor simulation often requires the use of Monte Carlo calculation techniques to estimateimportant reactor parameters. One drawback of these Monte Carlo calculation techniques is they inevitablyresult in some uncertainty in calculated quantities. The present study includes parametric uncertaintyquantification (UQ) and sensitivity analysis (SA) on the Advanced Test Reactor Critical (ATRC)facility housed at Idaho National Laboratory (INL) and addresses some complications due to Monte Carlouncertainty when performing these analyses. This approach for UQ/SA includes consideration of MonteCarlo code uncertainty in computed sensitivities, consideration of uncertainty from directly measuredparameters and a comparison of results obtained from brute-force Monte Carlo UQ versus UQ obtainedfrom a surrogate model. These methodologies are applied to the uncertainty and sensitivity of keff for twosets of uncertain parameters involving fuel plate geometry and fuel plate composition. Results indicate that the less computationally-expensive method for uncertainty quantification involvinga linear surrogate model provides accurate estimations for keff uncertainty and the Monte Carlo uncertaintyin calculated keff values can have a large effect on computed linear model parameters for parameterswith low influence on keff.
Performing linear regression with responses calculated using Monte Carlo transport codes
Dean Price,Brendan Kochunas 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.5
In many of the complex systems modeled in the field of nuclear engineering, it is often useful to uselinear regression-based analyses to analyze relationships between model parameters and responses ofinterests. In cases where the response of interest is calculated by a simulation which uses Monte Carlomethods, there will be some uncertainty in the responses. Further, the reduction of this uncertaintyincreases the time necessary to run each calculation. This paper presents some discussion on how theMonte Carlo error in the response of interest influences the error in computed linear regression coefficients. A mathematical justification is given that shows that when performing linear regression inthese scenarios, the error in regression coefficients can be largely independent of the Monte Carlo errorin each individual calculation. This condition is only true if the total number of calculations are scaled tohave a constant total time, or amount of work, for all calculations. An application with a simple pin cellmodel is used to demonstrate these observations in a practical problem.