• 태양에너지
• /
• 제7권1호
• /
• pp.35-41
• /
• 1987

This paper presents a comprehensive computer simulation of hydrogenated amorphous p-i-n silicon solar cells. The physical mechanism governing solar cell operation has been modeled and solved numerically by Runge-Kutta-Gill method. Effects of gap state density, dopant impurity, diffusion length and interface recombination velocity on solar cell performance are investigated. Numerical results show that the electric field in i-region is not uniform but depends strongly on voltage and position. A rather poor fill factor may be due to the electric field variation and short diffusion length. It is found out that the life time should be improved in order to increase a fill factor and a conversion efficiency.

• 한국중재학회지:중재연구
• /
• 제30권3호
• /
• pp.21-45
• /
• 2020

The major legal issues of this case were governing law questions regarding the liability of the shipowner/employer to its employee. It is true that in the absence of the parties' choice of law, the arbitral tribunal may apply the substantive laws or rules of law which it deems appropriate. However, it does not mean that the arbitral tribunal has arbitrary discretion in choosing the appropriate law as the governing law of the case; rather, the arbitrators should carefully examine the conflict of law rules of the forum and the requirement of the law of the country where the upcoming arbitral award will be enforced. They must bear in mind the role of the "connecting factors" in determination of the governing law. Therefore, the application of an alien law, which has minimal connecting factor with the case, may lead to a conclusion that is hardly understood by the parties. On the same token, the arbitrators must pay attention to applying the mandatory rules of a country, the laws of which not being the governing law of the issue. It is said that the application of the mandatory rules is a necessary evil to secure the enforcement of the award in the country, which has national interest in applying its own law to the issue. Further, arbitrators must pay attention to the consistent application of the law and respect the integrity of a legal system to reach a fair conclusion. The place of service of a seafarer for a vessel navigating international sea ought to be its home port country rather than the country of the ship registry, and the party autonomy in choice of the law in a seafarer employment should be respected.

• 한국전산구조공학회논문집
• /
• 제27권6호
• /
• pp.643-651
• /
• 2014

이 논문에서는 케이블교량 설계기준의 설계하중조합에 대한 신뢰도분석을 수행하였다. 설계기준에서 정의한 하중계수와 저항계수를 적용하여 설계된 실제 케이블교량을 대상으로 주 부재별 통계특성과 설계지배 하중조합을 분석하였다. 신뢰도분석을 통하여 하중조합별로 설정된 목표신뢰도지수를 확보됨을 확인하였고, 교량의 중요도를 상향할 수 있는 저항수정계수의 적용성을 검토하였다. 설계변수들이 신뢰도지수에 미치는 민감도 분석을 통하여 케이블의 신뢰도에 중요한 영향을 주는 요소를 분석하였다. 이를 통하여 설계기준의 안전계수들을 적용한 설계를 통하여 케이블교량의 목표신뢰도지수를 확보할 수 있음을 확인하였다.

• Structural Engineering and Mechanics
• /
• 제55권3호
• /
• pp.605-638
• /
• 2015

It is intended to perform buckling analysis of steel gabled frames with tapered members and flexible connections. The method is based on the exact solutions of the governing differential equations for stability of a gabled frame with I-section elements. Corresponding buckling load and subsequently effective length factor are obtained for practical use. For several popular frames, the influences of the shape factor, taper ratio, span ratio, flexibility of connections and elastic rotational and translational restraints on the critical load, and corresponding equivalent effective length coefficient are studied. Some of the outcomes are compared against available solutions, demonstrating the accuracy, efficiency and capabilities of the presented approach.

• 한국도로학회논문집
• /
• 제16권6호
• /
• pp.27-37
• /
• 2014

PURPOSES : The purpose of this study is to verify the causes of surface scaling at L-shoulder concrete structure. METHODS : From the literature reviews, mechanisms of frost damage were studied and material properties including strength, air void, spacing factor and scaling resistance of L-shoulder concrete structure were analyzed using core specimens taken by real fields. RESULTS : The spacing factor of air void has relatively high correlation of surface conditions : lower spacing factor at good surfacing condition and vice versa. If the compressive strength is high, even thought spacing factor does not reach the threshold value of reasonable durability, the surface scaling resistance shows higher value. Based on these test results, the compressive strength also provide positive effect on the surface scaling resistance. CONCLUSIONS : The main causes of surface scaling of L-shoulder could be summarized as unsuitable aid void amount and poor quality of air void structure. Secondly, although the compressive strength is not the governing factor of durability, but it shows the positive effect on the surface scaling resistance.

• International Journal of Safety
• /
• 제2권1호
• /
• pp.17-22
• /
• 2003

In order to analyze general three dimensional cracks in an infinite body, the symmetric Galerkin boundary element method formulated by Li and Mear is used. A crack is modelled as distribution of displacement discontinuities, and the governing equation is formulated as singularity-reduced integral equations. With the proposed method several example problems for three dimensional cracks in an infinite solid, as well as their growth under fatigue, are solved and the accuracy and efficiency of the method are demonstrated.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2002년도 학술대회지
• /
• pp.709-710
• /
• 2002

Cancer angiogenesis is simulated using a two dimensional model. Governing equation of angiogenesis is a TAE (Tumor angiogenesis factor) conservation equation in time and space. A stochastic process model is utilized to simulate vessel formation, proliferation, and migration to a cancer pellet. Numerical results are presented especially in case of growing cancer.

• 대한전기학회논문지
• /
• 제36권4호
• /
• pp.240-251
• /
• 1987

In this paper, with the end effect taken into consideration, the fundamental characteristics of a linear induction motor-the eddy currents of the secondary conducting sheet (traveller), the flux density in the air gap-are analysed by means of electromagnetic field theory. Accordingly, the derived governing eqations of the chatacteristics with goodness factor, presents that it was possible not only to predict the performance characteristics, but to obtain the data that needs to optimize a design of a motor with the reduction of the end effect.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 1998년도 봄 학술발표회 논문집
• /
• pp.457-464
• /
• 1998

The equilibrium path of shallow sinusoidal arches supported by hinges at both ends is investigated. The displacement increment method is used to get the solution of the nonlinear differential equations for these structures and to plot the equilibrium paths by the results. Using the equilibrium paths, the relations between the position of buckling point and buckling type for the case of sinusoidal distributed loads are inferred. From the result that the buckling type changes according to the normalized rise of arch, it is also shown that the arch rise is the governing factor to stability regions

• 산업기술연구
• /
• 제9권
• /
• pp.109-117
• /
• 1989

In the finite element analysis of semiconductor devices analysis, the solution often be diverged due to the numerical instability of discretized equations. To overcome this problems, a noble finite element code which guarantees a successful convergence is developed. The factor of divergence in the current continuity equation of semiconductor governing equations is derived using stability test and an adaptive mesh refine scheme is introduced to eliminates the divergence properties. A test calculation of GaAs MESFET model reveals that the proposed scheme has a robust self-convergence property and is suitable for the semiconductor devices analysis.