• 한국전산유체공학회지
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• 제2권2호
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• pp.26-34
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• 1997

An implicit viscous turbulent flow solver is developed for two-dimensional geon unstructured triangular meshes. The flux terms are discretized based on a cell-centered formulation with the Roe's flux-difference splitting. The solution is advanced in time us backward-Euler time-stepping scheme. At each time step, the linear system of equation approximately solved wi th the Gauss-Seidel relaxation scheme. The effect of turbulence is with a standard k-ε two-equation model which is solved separately from the mean flow equation the same backward-Euler time integration scheme. The triangular meshes are generated advancing-front/layer technique. Validations are made for flows over the NACA 0012 airfoil. Douglas 3-element airfoil. Good agreements are obtained between the numerical result experiment.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 1997년도 추계 학술대회논문집
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• pp.29-37
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• 1997

An implicit viscous turbulent flow solver is developed for two-dimensional geometries on unstructured triangular meshes. The flux terms are discretized based on a cell-centered finite-volume formulation with the Roe's flux-difference splitting. The solution is advanced in time using an implicit backward-Euler time-stepping scheme. At each time step, the linear system of equations is approximately solved with the Gauss-Seidel relaxation scheme. The effect of turbulence effects is approximated with a standard $k-{\varepsilon}$ two-equation model which is solved separately from the mean flow equations using the same backward-Euler time integration scheme. The triangular meshes are generated using an advancing-front/layer technique. Validations are made for flows over the NACA0012 airfoil and the Douglas 3-element airfoil. Good agreements are obtained between the numerical results and the experiment.

• 사상체질의학회지
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• 제5권1호
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• pp.157-173
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• 1993

In order to investigate experimentally the clinical effects of Soeuminsohaphyangwon that was prescribed to cure the Wisunanrihanbyung of Soeum-In, the author experimented various activities of mixed extract from the Soeuminsohaphyangwon by the method prescribed in the experimental part. The results of the studies were summerized as follows : 1. Suppressive action was not shown on the convulsion induced by strychnine but significant effect was noted on the convulsion induced by picrotoxin and caffeine. 2. In acetic acid method experiment analgesic effect was noted. 3. A prolongation of anesthetic time by Pentobarbital sodium and antipyretic effect was observed. 4. Relaxing action was noted on the ileums of mice, also same effect was recognized on contraction of the ileums due to acetylcholine, barium chloride and histamine 2 HCl. 5. The expansion of blood vessels by relaxation of smooth muscle and fall of blood pressure were noted. According to the above results, effects based on oriental medical references were approximate to the actual experimental results.

• 대한전자공학회논문지SD
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• 제42권3호
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• pp.9-16
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• 2005

[ $Si_{1-x}Ge_x$ ] 위의 Si 반전층에서의 이동도를 반전층에서의 양자현상(버금띠 에너지와 파동함수)과 완화시간어림셈을 고려하여 계산하였다. 반전층에서의 양자현상은 슈뢰딩거 방정식과 포아슨 방정식을 자체 모순없이 계산하여 얻었다 완화시간은 밸리내 산란과 밸리사이 산란을 고려하여 계산하였다. 그 결과 Ge 함량이 증가됨에 따라 이동도가 증가되는 이유는 4-폴드 밸리에 존재하는 전자의 이동도보다 2-폴드 밸리에 존재하는 전자의 이동도가 약 3배 정도 크며 대부분의 전자가 밸리의 분리에 의해 2-폴드 밸리에 존재하기 때문이라는 것을 알 수 있었다. 한편, 포논 산란만을 고려한 이동도를 실험치와 일치시키기 위하여 전체 이동도에는 반전층 계면에서의 산란과 쿨롱 산란을 포함시켰다. 계산된 전계, 온도, 그리고 Ge 함량에 의존하는 이동도는 실험치와 근접하도록 변형포텐셜을 설정하였으며 정확한 결과를 위해서는 Si 에너지띠의 비포물성을 고려해야함을 확인하였다.

• 한국간호교육학회지
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• 제5권1호
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• pp.20-38
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• 1999

This study is conducted to test an effect of the guided Imagery program on artificially induced pain and to develop an effective nursing intervention for patients with pain. The subjects of this study were 37 normal female university students. The data were collected from September 1998 to December 1998. And two group non-equal quasi -experimental research with pre and post design was used in this study, The data were analyzed with the SPSS $PC^+$ program with percentage, t-test, paired t-test and ANCOVA. The results of this study were as follows : 1. There are no significant differences of systolic blood pressure between groups. 2. The experimental group showed significantly lower diastolic blood pressure than control group after treatment. 3. There are no significant differences of pulse rate between groups. 4. The experimental group showed significantly higher body temperature than control group after treatment. 5. There are no significant differences of pain intensity between groups. 6. There are no significant differences of pain sensation between groups. 7. There are no significant differences of perceived pain tolerance time between groups. 8. The experimental group showed significantly longer real pain tolerance time than control group after treatment. 9. There are no significant differences of anxiety scores between groups. 10. There are no significant differences of Self-esteem scores between groups. 11. There are no significant differences of Self-esteem scores between groups. 12. There are no significant differences of imagability scores between groups. 13. The post-experimental group showed significantly higher relaxation rate than pre -experimental group. 14. There are no significant differences of imaging depth degree between pre-experimental group and post-experimental group. From the above results, it can be concluded that 1. This guided imagery program could be recommenced as an effective nursing intervention to relieve pain. 2. A follow up study is needed to identify long-term effects.

• Macromolecular Research
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• 제12권3호
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• pp.282-289
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• 2004

We have extensively characterized the fluorescence behavior of unsaturated polyester (UP) resin in the absence and presence of a 1,3-bis-(l-pyrenyl)propane (BPP) fluorescent probe at various dynamic and isothermal cure histories by means of a steady-state fluorescence technique using a front-face illumination equipment. In addition, we explored the effect of the fluorescence intensity on the relaxation of the fluorescent probe in the UP resin by resting the dynamically and isothermally cured resin at ambient temperature and pressure for 24 h. The monomer fluorescence intensity, which has two characteristic peaks at 376 and 396nm, changed noticeably depending on the cure temperature and time and provided important information with respect to the molecular and photophysical responses upon curing. The result of the fluorescence study indicates that the increased local viscosity and restricted molecular mobility of the UP resin surrounding the BPP probe after curing are both responsible for the enhancement of the monomer fluorescence intensity. Our results also demonstrate that once the BPP probe has enough time to rearrange and become isolated prior to fluorescence, a sufficient amount of fluorescence is emitted. Therefore, we note that the fluorescence behavior of this UP resin system is influenced strongly by the relaxation process of the fluorescent probe in the resin as well as process used to cure the resin.

• 한국산학기술학회논문지
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• 제9권6호
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• pp.1800-1805
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• 2008

시로아비앙가는 인도의 고대의 의학서이면서 건강관리의 지침서인 아유르베다의 한 시술법이다. 본 연구는 시로아비앙가가 스트레스 완화에 미치는 효과를 20대 여성을 대상으로 살펴보았다. 이 실험은 뇌파측정을 통해 알아보았는데, 시로아비앙가 마사지가 좌뇌의 델타파와 우뇌의 델타파, 세타파를 떨어뜨리고, 우뇌의 알파파와 SMR파, 로우베타파는 증가시키는 것으로 나타났다. 수면 시에 나타나는 델타파와 세타파가 깨어있을 때 높게 나타난 것은 대상자가 스트레스와 긴장상태에 있음을 의미하고, 시로아비앙가 마사지 이후에 델타파와 세타파가 감소하는 결과는 긴장상태가 완화됨을 나타낸다. 뇌가 활동하고 있을 때 나오는 알파파는 심신이 이완되어 편안할 때 가장 많이 나오는 뇌파이다. 따라서 알파파가 시로아비앙가 마사지 후 증가하는 점은 시로아비앙가 마사지가 스트레스 완화에 영향을 미침을 알 수 있다.

• 대한의용생체공학회:의공학회지
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• 제42권1호
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• pp.25-30
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• 2021

Objective: The aim of this study is to consider the effect of skin tissue necrosis by improving blood flow in animal skin models for low frequency pulsed electromagnetic fields (LF_PEMF) stimulation. Methods: Twenty rats (Wistar EPM-1 male, 280-320 g) were randomly divided into control groups (n=10) and the PEMF groups (n=10). To induce necrosis of the skin tissue, skin flap was treated in the back of the rat, followed by isolation film and skin flap suturing. Subsequently, the degree of necrosis of the skin tissue was observed for 7 days. The control group did not perform any stimulation after the procedure. For the PEMF group, LF_PEMF (1 Hz, 10 mT) was stimulated in the skin flap area, for 30 minutes a day and 7 days. Cross-polarization images were acquired at the site and skin tissue necrosis patterns were analyzed. Results: In the control group, skin tissue necrosis progressed rapidly over time. In the PEMF group, skin tissue necrosis was slower than the control group. In particular, no further skin tissue necrosis progress on the day 6. Over time, a statistically significant difference from the continuous necrosis progression pattern in the control group was identified (p<0.05). Conclusions: It was confirmed that low frequency pulsed electromagnetic fields (LF_PEMF) stimulation can induce relaxation of skin tissue necrosis.

• 생약학회지
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• 제16권4호
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• pp.199-205
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• 1985

In order to investigate experimentally the clinical effects of Soeuminsohapwon that was prescribed to cure cerebral hemorrhage, palpitation etc, the author tested various activities of extract from the Soeuminsohapwhangwon by the method prescribed in the experimental part. The results of the studies were summarized as follows: Suppressive action was not shown on the convulsion induced by strychnine, but significant effect was noted on the convulsion induced by picrotoxin and caffeine. In acetic acid method, analgesic effect was noted. A prolongation of anesthetic time by pentobarbital sodium and antipyretic effect was observed. Relaxing action was noted on the ileum of mice, also same effect was recognized on contraction of the ileum due to acetylcholine, barium chloride and histamine. The expansion of blood vessels by relaxation of smooth muscle and hypotensive action were noted. According to the above results, effects based on oriental medical references were approximate to the actual experimental results.

• Steel and Composite Structures
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• 제36권3호
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• pp.249-259
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• 2020

In this work, a novel three-dimensional model in the generalized thermoelasticity for a homogeneous an isotropic medium was investigated with diffusion, under the effect of thermal loading due to laser pulse in the context of Green-Lindsay theory was investigated. The normal mode analysis technique is used to solve the resulting non-dimensional equations of the problem. Numerical results for the displacement, the thermal stress, the strain, the temperature, the mass concentration, and the chemical potential distributions are represented graphically to display the effect of the thermal loading due to laser pulse and the relaxation time on the resulting quantities. Comparisons are made within the theory in the presence and absence of laser pulse.