• 한국콘텐츠학회논문지
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• 제18권10호
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• pp.158-164
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• 2018

본 연구는 다양한 원인에 의해 코일 중심에 목적 부위를 위치시킬 수 없을 경우 통계적으로 코일 중심과 신호강도가 동일한 기준 거리를 제시하여 최적의 신호강도를 유지할 수 있는 방안을 마련하고자 하였다. 연구방법은 원통형 fluid 팬텀을 코일 중심에서 상 하 방향으로 1 cm 씩 이동시켜 가면서 10 cm 까지 영상을 획득한 후, 신호강도를 측정하여 비교 평가하였다. 연구결과, T1 강조영상은 코일 중심에서 상방향 4 cm와 하방향 1 cm, T2 강조영상은 상방향 5 cm와 하방향 3 cm 이내일 경우 기준인 코일 중심의 신호강도와 유의한 차이가 없음을 알 수 있었다. 결론적으로 본 연구에서 제시한 기준 거리 이내로 영상화하려는 목적 부위를 위치시킨다면 최적의 신호강도를 유지할 수 있으리라 판단된다.

• 대한수의학회지
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• 제30권1호
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• pp.41-49
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• 1990

These experiments were carried out to develop a novel, simple, and rapid method to determine urinary sulfonamides using fluorescamine by spectrofluorometry. To get optimal conditions for the sulfonamide-fluorescamine reaction, sulfonamides such as sulfamethazine, sulfamerazine, sulfadimethoxine and sulfamonomethoxine, dissolved in buffers with various pH ranges were reacted with various concentrations of fluorescamine. and then, the fluorescence intensity and stability of the fluorophore were measured. To eliminate the interfering substances in urine, the fluorophore in buffers and urine with a definite pH range was extracted with some organic solvents. After then the fluorescence intensity was measured in organic and aquous phases. The results obtained were summarized as follows: 1. The maximal fluorescence of sulfonamides was presented in acidic state, pH 4.5~5.0, at 30 minutes after reaction. 2. The optimal concentration ratio of sulfamethazine and ffuorescamine was more than 1 : 40 in mole. 3. In pH 4.0, the intensity was maximal but was time-dependent, whereas in pH 8.0, the intensity was time-independent. 4. Sulfamethazine-fluorescamine conjugate could be dissolved in some of organic solvents in acidic state such as chloroform, n-butanol, and ethylacetate. 5. Sulfamethazine-flnorescamine conjugate in swine urine coule be extracted with ethylacetate in acidic state, pH 4.0~5.0.

• 한국통신학회논문지
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• 제37권8A호
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• pp.698-705
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• 2012

무안경 방식 스테레오스코픽 입체 디스플레이 시스템에서 시역간 크로스토크는 입체시를 저해하는 주요 문제이다. 기존 크로스토크에 대한 연구는 관찰자면에서 수평 방향으로 인접한 시역간 겹침비를 정량적으로 분석하는 것이 대부분이었으나, 본 연구에서는 이를 포함, 깊이 방향으로 형성되는 해당시점영상의 밝기분포를 정량화하여 수평, 깊이방향에 따른 유효 관찰영역을 제시함으로서 효과적인 입체시 시청 범위를 제공하는데 목적을 두었다. 본 논문에서는 무안경방식의 스테레오스코픽 입체 디스플레이 환경에서 유발되는 크로스토크의 주요 인자들을 디스플레이 환경 및 관찰환경에서 도출하고 이들의 관계를 정성적으로 분석할 수 있는 알고리듬 개발 및 이를 가시화 할 수 있는 시뮬레이션 툴을 제작하였다. 더불어 시뮬레이션 결과를 응용하여 관찰자를 최적의 입체시 시청영역으로 유도 할 수 있는 최적입체시 가이드 시스템을 제안하였다.

• 한국경영과학회지
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• 제22권4호
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• pp.183-219
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• 1997

In this research, the intensity of solar energy, which was injected to the different angle plane every hour day by day, was technically documented and quantitatively analyzed through actual observations. In order to group every days into days with similar intensity, graph was drawn with respect to time for every dary and each area value under the curve was calculated. Then, the search for grouped days having similar intensity curve patterns was carried out. In order to maximize the efficiency of solar energy systems, the optimum incident angle of absorber plate was derived.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.1157-1159
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• 2003

The effect of the scan velocity modulation is studied. The effect of the velocity modulation on the picture image is judged from the intensity profile of the image. The intensity profile is obtained as time integral of moving Gaussian beam. To confirm the applicability of this integral formula, the measurement and simulation data is compared. And by calculating the intensity profile for different amounts of velocity modulation, the optimum modulation displacement that gives the best image quality is obtained. This optimum modulation displacement can be used in designing scan velocity modulation system.

• 호남수학학술지
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• 제38권3호
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• pp.661-674
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• 2016

In [15] they introduced a new finite element method for accurate numerical solutions of Poisson equations with corner singularities, which is useful for the problem with known stress intensity factor. They consider the Poisson equations with homogeneous Dirichlet boundary condition, compute the finite element solution using standard FEM and use the extraction formula to compute the stress intensity factor, then they pose a PDE with a regular solution by imposing the nonhomogeneous boundary condition using the computed stress intensity factor, which converges with optimal speed. From the solution we could get accurate solution just by adding the singular part. This approach works for the case when we have the accurate stress intensity factor. In this paper we consider Poisson equations with mixed boundary conditions and show the method depends the accrucy of the stress intensity factor by considering two algorithms.

• East Asian mathematical journal
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• 제33권1호
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• pp.1-9
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• 2017

In [8] they introduced a new finite element method for accurate numerical solutions of Poisson equations with corner singularities, which is useful for the problem with known stress intensity factor. They consider the Poisson equations with homogeneous Dirichlet boundary condition, compute the finite element solution using standard FEM and use the extraction formula to compute the stress intensity factor, then they pose a PDE with a regular solution by imposing the nonhomogeneous boundary condition using the computed stress intensity factor, which converges with optimal speed. From the solution they could get accurate solution just by adding the singular part. This approach works for the case when we have the reasonably accurate stress intensity factor. In this paper we consider Poisson equations defined on a domain with a concave corner with Neumann boundary conditions. First we compute the stress intensity factor using the extraction formular, then find the regular part of the solution and the solution.

• 한국전문물리치료학회지
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• 제24권4호
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• pp.38-45
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• 2017

Background: To improve muscle flexibility, static stretch is the most common type and is considered safe and effective for improving overall flexibility of muscles. During the stretch, the intensity is more likely to be determined by the degree of an athlete's pain and practitioner's skills rather than quantitative measures of stretch. It is necessary to determine the optimal intensity for the stretch. Objects: The purpose of this study is to explore the relationship between hand held dynamometer (HHD) and verbal rating scale (VRS) in comparison of the effects of continuance time on active (walking) and inactive (sitting) movement after static stretch. Methods: A cross-sectional study was conducted with a sample (n=62) recruited from a university. Participants were randomly assigned to 2 different groups (n=31 for each group) based on participants' positions either remaining in sitting or freely walking around for a series of re-assessments. Data was collected at pre-warm up, pre-stretch, post-stretch, and additional assessments at the time of 3, 6, 9, 12, 15, 20 and 30 minutes after the stretch. Results: Relationship between VRS and HHD scores represents very weak correlation (Spearman's p=-.16, p>.05). Pearson's correlation analysis was conducted following the logarithmic transformation of the two scores. Pearson's correlation after the transformation still showed a very low relationship and a poor linear relationship between the two scores (Pearson's r=-.18, p>.05). Conclusion: The optimal intensity for stretch cannot be solely determined by the subjective pain perception. The objective measurement such as HHD could be used in conjunction with the pain perception.

• 한국식품영양과학회지
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• 제26권4호
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• pp.620-624
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• 1997

온도, pH, 배양시간을 세가지 인자로 하고 반응표면 분석을 통하여 Bacillus subtilis DC-2균에 의한 색소 생성 및 DPPH($\alpha$,$\alpha$-diphenyl-$\beta$-picryl-hydrazyl)에 의한 전자공여성의 최적 조건을 조사하였다. 색소생성능에는 배양온도가 10% 유의수준에서 영향을 미치는 것으로 나타났으며, DPPH에 의한 전자공여성의 경우 배양온도가 5% 유의수준, pH가 10% 유의수준에서 영향을 미치며, 배양시간은 10% 유의수준에서 영향을 미치지 않는 것으로 나타났다. Bacillus subtilis DC-2의 색소생성 최적 조건은 배양온도 39.$25^{\circ}C$, pH 8.83 및 84.41 시간으로 나타났으며 DPPH에 의한 전자공여성은 배양 온도 39.19$^{\circ}C$, pH 8.84 및 82.21시간에서 가장 높은 것으로 나타났다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 1998년도 학술발표회 논문집
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• pp.103-108
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• 1998