• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2004년도 제5회 압연심포지엄 신 시장 개척을 위한 압연기술
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• pp.184-196
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• 2004

An Eulerian finite element analysis for the steady state rolling process is addressed. This analysis combines the crystal plasticity theory fur texture development as well as the continuum damage mechanics for growth of micro voids. Although an Eulerian analysis for steady state rolling has many advantages, it needs an initial assumption about the shape of control volume. However, the assumed control volume does not match the final shapes. To effectively predict the correct shape in an assumed control volume, a free surface correction algorithm and a streamline technique are introduced. Applications to plate rolling, clad rolling, and shape rolling will be given and the results will be discussed in detail.

• Nuclear Engineering and Technology
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• 제15권1호
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• pp.11-22
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• 1983

가압 경수로의 노 냉각수 제어계통의 신뢰도를 해석하였다. 이 신뢰도 해석에서 붕소주입실패를 상위사고로 설정하였다. 신뢰도 해석은 고장계통도를 작성한 후 이 고장 계통도로부터 최소절군을 구하였다. 붕소주입실패에 의한 노 냉각수 제어계통의 불가용성은 1.497$\times$$10^{-5}$으로 계산되었다. 노 냉각수 제어계통의 불가용성에 가장 중요한 영향을 미치는 것은 붕산전달펄프의 신뢰도이며, 인간의 실수 역시 계통 신뢰도에 중요한 인자임이 나타났다.

• 국제초고층학회논문집
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• 제1권2호
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• pp.73-80
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• 2012

In order to use sea breezes to counter the heat island phenomena, i.e. to promote urban ventilation, it is necessary to clarify the effect of building morphology and height on large-scale wind fields. In this study, the sea breeze in the vicinity of the Kanto Plain in Japan is simulated using a mesoscale meteorological model incorporating an urban canopy model, and the inland penetration of sea breezes is accurately reproduced. Additionally, a mean kinetic energy balance within a domain (Control Volume; CV) moving along the sea breeze is analysed. From the results, it is clarified that the sea breeze is interrupted by the resistance and turbulence caused by buildings at the centre of Tokyo. The interruption effect is increased in accordance with the height of these buildings. On the other hand, adverse pressure gradients interrupt in the internal region.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
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• pp.570-574
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• 1990

Detection of left ventricular boundary for the functional analysis of LV(left ventricle)is obtained using automatic boundary detection algorithm based on dynamic programming method. This scheme reduces the edge searching time and ensures connective edge detection, since it does not require general edge operator, edge thresholding and linking process of other edge. detection methods. The left ventricular diastolic volume and systolic volume and systolic volume were computed after this automatic boundary detection, and these Volume data wm applied to analyze LV ejection fraction.

• 대한물리치료과학회지
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• 제25권1호
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• pp.62-74
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• 2018

Background: The purpose of this study is intended to evaluate the effectiveness and analyse the change on flexibility, muscular volume and pain of university students with low back pain by stabilization exercise using XCO. Methods: The subjects(N=23) with low back pain are recruited from K university located Chungbuck. The subjects which are divided to 2 group as experimental group(N=12) conducted the stabilization exercise using XCO and control group(N=11) conducted the general stabilization exercise. The flexibility, muscular volume and pain were measured before and after intervention. Results: There were no significant differences(p>.05) in sex, age, height and weight among subjects. Also there were no significant differences(p>.05) in muscular volume and pain between of the experimental group and control group. A significant difference(p<.05) in the flexibility, contraction EO(External Oblique), contraction IO(Internal Oblique), contraction TA(Transverse Abdominal) and pain in the experimental group. There was significant difference(p<.05) in the flexibility, contraction EO(External Oblique), contraction IO(Internal Oblique) and pain in the control group. There was a significant difference(p<.05) in the flexibility of the experimental group between the control group. Conclusion: Based on this study, through a variety of age and various intervention period to apply more subjects conducting Stabilization exercise using XCO should continue.

• 생물정신의학
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• 제18권4호
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• pp.232-238
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• 2011

Objectives Optimized voxel based morphometry (VBM) has been increasingly applied to investigate differences in the brain morphology between a group of patients with mild cognitive impairment (MCI) and control subjects. Optimized VBM permits comparison of gray matter (GM) volume at voxel-level from the entire brain. The purpose of this study was to assess the regional GM volume change measured by optimized VBM in MCI subjects compared to controls. Methods Twenty patients with MCI and 20 control subjects with normal cognition were recruited for this study. We applied the optimized VBM protocol to the image data including study-specific template and the modulation of the data with the Jacobian determinants. GM volume differences between the MCI subjects and the control subjects and their correlations with the neuropsychological performances were investigated. Results Optimized VBM analysis revealed GM volume reduction in hippocampus, precentral gyrus, insula and parietal operculum in the MCI group compared to the control group (family wise error corrected p < 0.05). Korean version of the Consortium to Establish a Registry for Alzheimer's disease (CERAD-K) word list recall scores were significantly correlated with the GM volumes of hippocampus, precuneus and posterior cingulate in the MCI group (FWE corrected p < 0.05). Conclusions The results confirm previous findings of atrophic changes in medial temporal lobe and parietal lobe in the MCI group and suggest that these abnormalities may be related with cognitive decline and prognosis in patients with MCI.

• 대한물리의학회지
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• 제7권2호
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• pp.157-164
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• 2012

Purpose : The Purpose of this study was on determine whether thoracic expension exercise might increase the pulmonary function of the patients with stroke. Methods : Fourty paients with stroke were randomly assigned to experimental(n=20) and control group(n=20). During four weeks, each group participated thirty minutes for five times per week. Subjects were assessed using pre-value and post-value measurement pulmonary function(Forced vital capacity, Forced expiratory volume at one second, FEV1/FVC, Peak expiratory flow, Tidal volume, vital capacity, Inspiratory capacity, Expiratory reserve volume, Inspiratory reserve volume). Results : These finding suggest that experimental group was significant increase in FVC, FEV1, PEF, TV, IC, IRV, ERV($p$<.05). In comparison of two group, experimental group was high pulmonary function than control group. Conclusion : This study showed experimental group can be used to improve pulmonary function than control group. Thus it indicates that the thoracic expension exercise will be more improved through the continued respiratory exercise program.

• 한국세라믹학회지
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• 제55권1호
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• pp.74-79
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• 2018

Active clay, bentonite and zeolite were used as porous materials for humidity controlling ceramic boards. The specific area and the pore volume of active clay were higher than those of bentonite and zeolite. It was effective to add white cement as well as a retarding agent to control the setting time of the ceramic paint. As the amount of added porous materials increases, the specific surface area and total pore volume of ceramic paint increase, but the average pore diameter decreases. The addition of porous materials having a high specific area and a large pore volume improves the moisture absorptive and desorptive performance of the ceramic paint. Therefore, in this experiment, the moisture absorptive and desorptive properties were best when active clay was added. Also, as the added amount of porous materials increases, the moisture absorptive and desorptive properties improve. In this experiment, when 70 mass% of active clay was added to ceramic paint, the hygroscopicity was highest at about $80g/m^2$.

• 대한약침학회지
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• 제14권3호
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• pp.47-53
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• 2011

Objectives: This study was performed to analyse the effects of Sweet Bee Venom(SBV-purified melittin supported by G&V Co., the major component of honey bee venom) on the respiratory system in rats. Methods: All experiments were conducted at Biotoxtech Company, a non-clinical studies authorized institution, under the regulations of Good Laboratory Practice(GLP). Male rats of 5 weeks old were chosen for this study and after confirming condition of rats was stable, SBV was administered in thigh muscle of rats in 0.175, 0.35 and 0.7 mg/kg dosage. And checked the effects of SBV on the respiratory system using the whole body plethysmography. And respiratory rate, tidal volume and minute volume of rats were checked after administered SBV (melittin). Results: 1. In the measurement of respiratory rate, there were not observed any significant differences compared with control group. 2. In the measurement of tidal volume, there was not observed any significant differences compared with control group. 3. In the measurement of minute volume, 0.35mg/kg dosage group showed significant differences compared with control group. But we estimated that this result was caused by individual differences. Conclusions: Above findings suggest that SBV seems to be safe treatment in the respiratory system of rats. And further studies on the subject should be conducted to yield more concrete evidences.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 춘계학술발표대회 논문집
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• pp.181-183
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• 2002

The accurate permeability for preform is critical to model and design the impregnation of fluid resin in the composite manufacturing process. In this study, the in-plane and transverse permeability for a woven fabric are predicted numerically through the coupled flow model which combines microscopic with macroscopic flow. The microscopic and macroscopic flow which are flows within the micro-unit and macro-unit cell, respectively, are calculated by using 3-D CVFEM(control volume finite element method). To avoid checker-board pressure field and improve the efficiency on numerical computation, A new interpolation function for velocity is proposed on the basis of analytic solutions. The permeability of plain woven fabric is measured through unidirectional flow experiment and compared with the permeability calculated numerically. Based on the good agreement of the results, the relationships between the permeability and the structures of preform such as the fiber volume fraction and stacking effect can be understood. The reverse and the simple stacking are taken in account. Unlike past literatures, this study is based on more realistic unit cell and the improved prediction of permeability can be achieved. It is observed that in-plane flow is more dominant than transverse flow in the real flow through preform and the stacking effect of multi-layered preform is negligible. Consequently, the proposed coupled flow model can be applied to modeling of real composite materials processing.