• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.13 no.3
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• pp.212-218
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• 2020

When Radiofrequency energy is applied to the human body, the vibration width is very short. Therefore, the electrolyte burn generated when using the direct current does not occur. Ion molecules, polarized molecules, etc., vibrate more than 40,000 times per second, converting them into frictional heat to generate deep heat. The blood flow of capillaries increases 4-5 times more than at rest, increasing the supply of oxygen, nutrients, antibodies, and white blood cells. In addition, the electrochemical reaction does not occur because the vibration width and the pulsation period are very short. It is a physical factor treatment method that does not stimulate the sensory nerves and motor nerves. In this study, an isotonic exercise is performed in a young normal adult using a Radiofrequency pain treatment device. The purpose of this study is to integrate rehabilitation therapy by measuring electromyography data during isotonic exercise and confirming the effect on changes in motor neuron response. The EMG data generated when isotonic exercise of the forearm biceps muscle and the EMG data measured after the use of a Radiofrequency pain treatment device after exercise were RMS, respectively, and verified through t-test. It was confirmed that there was a significant difference in both men and women because the t-value was smaller than the significance level p (<.05).

• Journal of the Korean earth science society
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• v.31 no.4
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• pp.370-377
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• 2010

In this study, we investigated the kinematical properties of the L1521F-IRS in Taurus region using HCN (J=1-0) molecular line. The high resolution mapping has carried out by $5{\times}5$ point observations covering $3.7'{\times}3.7'$ area using a 12-m telescope of Arizona Radio Observatory in Tucsan, USA. L1521F which harbors the faint infrared L1521F-IRS, displayed a strong central concentration of integrated intensity in HCN without serious molecular depletion. It showed a symmetric kinematical structure with the opposite infall motion in either side of the central cores. It is a direct evidence of bipolar outflows in the core of L1521F.

• Journal of the Korean Chemical Society
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• v.43 no.4
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• pp.475-484
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• 1999

This study was to investigate the effective order of instruction for students learning the concepts of chemical change. Chemical change was considered as the important area in 8th grade chemistry part. The study consisted of 168 8th grade students, two classes of boys and girls each, from a middle school in Seoul. They were divided into two groups, the experimental group and the control group. The control group was taught in the order, which was presented in the science textbook; chemical change, atom, and molecule (CAM). For the experimental group, the order was molecule, atom, and chemical change (MAC). From the results of the study, there was a statistically significant difference between the control group and the experimental group. But the interviews indicated that the students were confused with the MAC method in spite of the effective learning. Therefore, for more effective concepts learning without a confusion, we need to provide our students with various learning sequences of science textbooks rather than fixed learning sequences.

• Journal of Life Science
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• v.26 no.1
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• pp.129-139
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• 2016

Exercise increases the expression and interaction of major neurotrophic factors such as brain-derived neurotrophic factor (BDNF), insulin-like growth factor-1 (IGF-1), and vascular endothelial growth factor (VEGF) at both central and peripheral tissues, which contributes to improved brain and neural plasticity and cognitive function. Previous findings have been to understand the effect of light or moderate intensity aerobic exercise on neurotrophic factors and cognitive function, not that of high intensity aerobic exercise. However, recent findings suggest that high intensity interval training is a safe, less time-consuming, efficient way to improve cardiorespiratory fitness and weight control, thus American College of Sport Medicine (ACSM)’s guidelines for exercise prescription for various adult populations also recommend the application of high intensity interval training to promote their overall health. High intensity interval training also enhances the expression of BDNF, IGF-1, and VEGF at the brain and peripheral tissues, which improves cognitive function. Increased frequency of intermittent hypoxia and increased usage of lactate as a supplementary metabolic resource at the brain and neural components are considered a putative physiological mechanism by which high intensity interval training improves neurotrophic factors and cognitive function. Therefore, future studies are required to understand how increased hypoxia and lactate usage leads to the improvement of neurotrophic factors and what the related biological mechanisms are. In addition, by comparing with the iso-caloric moderate continuous exercise, the superiority of high intensity interval training on the expression of neurotrophic factors and cognitive function should be demonstrated by associated future studies.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.466-468
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• 2004

Molecular modelling은 시뮬레이션을 통해 온도, 압력 등과 같은 분자 운동에 영향을 미칠 수 있는 요소를 설정한 후 분자의 움직임을 관찰하는 방법으로 신약, 신소재, 고분자 개발에 있어서 연구 개발 기간을 단축하는 효과적인 방법이다. 기존의 molecular modelling 어플리케이션들은 슈퍼컴퓨터나 단일 클러스터를 이용하여 작업을 수행하도록 설계되어 비용과 성능 측면에서 문제점을 가지고 있다. 1590년대 중반 지리적으로 분산되어 있는 광범위한 자원들을 공유하여 장기간 소요되는 컴퓨팅 작업의 성능 향상 및 비용절감을 목적으로 하는 그리드(grid)가 등장하였다. 이에 본 연구에서는 효율적이면서도 저비용을 갖는 molecular modelling 어플리케이션 개발을 위해 그리드를 기반으로 최적 자원 선택 브로커를 이용하는 molecular docking 어플리케이션을 제안한다. 이를 위해 우리는 molecular docking을 수행하는 그리드 환경의 계층 구조를 설계하고 효율적 작업 수행을 위한 최적 자원 선택 브로커를 설계하였다. 그리고 그리드 환경에서 molecular docking 어플리케이션의 효과적인 수행을 위해 molecular docking 연산 모델을 정의하고 필요한 molecular docking 어플리케이션의 요소들을 설계하였다.

• 한국전산유체공학회:학술대회논문집
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• 2008.03a
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• pp.204-207
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• 2008

Stochastic molecular dynamics simulation is a variation of standard molecular dynamics simulation that basically omits water molecules. The omission of water molecules, occupying a majority of space, enables flow simulation at microscale. This study reports our stochastic molecular dynamics simulation of particles diffusing in rectangular microchannels. We interestingly found that diffusion patterns in channels with a very small aspect ratio differ by dimensions. We will also discuss the future direction of our research toward a more realistic simulation of micromixing.

• 한국전산유체공학회:학술대회논문집
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• 2008.10a
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• pp.204-207
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• 2008

Stochastic molecular dynamics simulation is a variation of standard molecular dynamics simulation that basically omits water molecules. The omission of water molecules, occupying a majority of space, enables flow simulation at microscale. This study reports our stochastic molecular dynamics simulation of particles diffusing in rectangular microchannels. We interestingly found that diffusion patterns in channels with a very small aspect ratio differ by dimensions. We will also discuss the future direction of our research toward a more realistic simulation of micromixing.

• Korean Journal of Optics and Photonics
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• v.6 no.1
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• pp.45-49
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• 1995

시간 상관 단일 광자 계수법을 사용하여 PVP/C/sub 2/H/sub 5/OH와 PEG/H/sub 2/O 혼합 용매에 위치한 rhodemine 6G 분자의 회전 재배열 시간을 측정하였다. 주어진 온도에서 혼합비를 변화시키면서 측정한 결과, PEG/H/sub 2/O와 PVP/C/sub2/H/sub 5/OH에서 각각 회전 이완 시간이 혼합액의 점성도에 선형적으로 비례하지 않는 것으로 관측되었다. 고분자 주의에 cluster가 형성된다는 관점에서 혼합비에 따른 회전 이완 시간의 변화를 설명하였다.

• Journal of the Korean Chemical Society
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• v.22 no.1
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• pp.1-6
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• 1978

Feeling the potential field within a cell for various environments, every liquid molecule moves to minimize its potential energy. With this simple and fundamental concept, liquid molecules may be treated as a combination of three kinds of typical molecules characterized by Lennard-Jones and Devonshire's earlier work. We can get a partition function which has better functional from and less defects compared to the cell theory and the significant structure theory.

• Proceedings of the Membrane Society of Korea Conference
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• 1994.04a
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• pp.53-54
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• 1994

Polyimide는 열, 화학적으로 안정하고 기계적성질이 우수하고, 기체분리특성이 비교적 좋다. Polyimide의 화학구조와 기체투과도와의 관계는 화학구조를 체계적으로 변화시키면서 많이 검토되어왔다.[1-2] Polyimide는 강직한 직쇄구조, bulky group에 의한 분자쇄운동성을 제어함과 동시, 약한 분자간 상호작용이 polymer chain의 유효층진을 억제하여 기체투과도를 높여준다. 국부분절운동(local segmental mobility)이 감소된 구조는 기체투과선택도를 향상시켜주는 경향을 보여주었다. [3] kim et al. 과 Stern et al은 6FDA나 fluorine-containing diamines으로 만든 polyimde가 매우높은 투과도를 보여준다고 보고했다. 본 연구에서는 6FDA-2, 4TDA hobopolymer에 BAAF를 가하여 copolyimide Membrane을 제막하여 BAAF 조성에 따라 투과선택도를 측정하는 homopolymer와 copolymer에 따른 변화를 관찰하였다.