• Title/Summary/Keyword: Y Factor Method

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Use of a Transformed Diode Equation for Characterization of the Ideality Factor and Series Resistance of Crystalline Silicon Solar Cells Based on Light I-V Curves (Light I-V 곡선을 이용한 결정질 태양전지의 이상계수와 직렬 저항 특성 분석)

  • Jeong, Sujeong;Kim, Soo Min;Kang, Yoonmook;Lee, Hae-seok;Kim, Donghwan
    • Korean Journal of Materials Research
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    • v.26 no.8
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    • pp.422-426
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    • 2016
  • With the increase in installed solar energy capacity, comparison and analysis of the physical property values of solar cells are becoming increasingly important for production. Therefore, research on determining the physical characteristic values of solar cells is being actively pursued. In this study, a diode equation, which is commonly used to describe the I-V behavior and determine the electrical characteristic values of solar cells, was applied. Using this method, it is possible to determine the diode ideality factor (n) and series resistance ($R_s$) based on light I-V measurements. Thus, using a commercial screen-printed solar cell and an interdigitated back-contact solar cell, we determined the ideality factor (n) and series resistance ($R_s$) with a modified diode equation method for the light I-V curves. We also used the sun-shade method to determine the ideality factor (n) and series resistance ($R_s$) of the samples. The values determined using the two methods were similar. However, given the error in the sun-shade method, the diode equation is considered more useful than the sun-shade method for analyzing the electrical characteristics because it determines the ideality factor (n) and series resistance ($R_s$) based on the light I-V curves.

Design of Daylighting Aperture Using Daylight Factor Method and its Evaluation by Distribution of Sky Component (Daylight Factor Method를 이용한 채광창의 설계와 주광율의 직접조도분에 의한 채광창의 평가)

  • Chee, Chol-Kon;Kwon, Young-Hye
    • Proceedings of the KIEE Conference
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    • 1988.11a
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    • pp.210-213
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    • 1988
  • A new and accurate expression to derive a window area is presented with a sequence for daylighting design using Daylight Factor Method process not in its classical point--by-point method but in lumen method as in artificial lighting design process to consider daylight in the early stage of a building design process. Accepting CIE Overcast Sky as the worst state with the lowest sky luminance, a user of a room can have more available daylight in his or her room. In the design process uniformity is checked to ensure reasonably even daylighting by comparing the depth of the room with the computed limiting depth. After these steps the shape and position of window is altered, of which the Sky Component of Daylight Factor under an Overcast Sky, SCo, is investigated and computed in Composite Simpson Multiple Integral so that a building designer or an analyst can choose the best shape and location that satisfies his/her taste and purpose of the room.

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Design of the Cross Sectional Shape of Intermediate Die for Shaped Drawing of Spline (스플라인 이형인발을 위한 중간 다이 단면형상 설계)

  • Lee, J.E.;Lee, T.K.;Lee, S.K.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.17 no.8
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    • pp.627-632
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    • 2008
  • The cross sectional shape of intermediate die is one of important parameters to improve dimensional accuracy of final product in shaped drawing process. Until now, it has been designed by the experience or trial and error of the expert. In this study, the cross sectional shape of intermediate die for spline shape is determined by the electric fields analysis and scale factor method. The result of the electric fields analysis and scale factor method have been compared with that of the expert method. The effects of cross sectional shape on the dimensional accuracy were investigated by using FE-simulation. And then the multi-stage shaped drawing experiments were performed to verify the results of FE-simulation. As a result, the cross sectional shape from the electric fields analysis and scale factor method had the good dimensional accuracy. These two methods can be used for the method to obtain the cross sectional shape of intermediate die in shaped drawing process.

Stability Analysis of the Slopes (사면의 안정해석에 관한 연구)

  • 강우욱;조성섭;지인택
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.31 no.1
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    • pp.58-70
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    • 1989
  • The paper compared the Bishop methed to the Fellenius method in the analysis of slope stability. Laboratory model test was carried out in the case of seepage flow considered. The results obtained from this study were summarized as follows; 1. The slice pieces of 10 were enough to analysis the slope stability. 2. The safety factor. by the Fellenius method was lower than the Bishop method by the 96 to 97% in the case of no seepage flow and by the 95 to 96% in the case of seepage flow considered. 3. Besides the parameter of soil and slope, the safety factor of slope was influenced by the height of slope. This phenomena was distinct in the height of height less than 10 meters. 4. In the case of clay, there was no difference in the safety factor of slope between Fellenius and Bishop rnethod. The safety factors of slope with the seepage flow considered were lower than those with no see-page flow. 5. The influence of cohesion on the safety factor was more significant in the Bishop method than in the Fellenius method. 6. The slope failure of model test of A and B soil samples with high permeability coefficient was taken place slightly in vicinity of toe by the concentration of stress and gradually increased 7. Under condition of same slope height, the shapper the slope, the shorter the radius and the center of critical circle appered downward and finally failure of slope occured inside the slope.

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Psychometric Properties of the Korean Version of the Kaufman Assessment Battery for Children (한국판 K-ABC의 심리측정학적 조명 : 확인적 요인분석을 중심으로)

  • Moon, Tai Hyong
    • Korean Journal of Child Studies
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    • v.19 no.2
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    • pp.97-113
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    • 1998
  • The purpose of this paper was to evaluate hypothesized alternative models for the factor structure of the Korean Version of the Aberrant Behavior Checklist(K-ABC) using standardized samples. Confirmatory factor analyses of correlated factor models using the Jeroskog method were carried out. Analyses supported the two-factor processing model. When the achievement scale was added, a three factor model (two processing factors and an achievement factor) emerged. When factorially uncorrelated models were analyzed, fit indices proved to be improper.

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An efficient method for reliable optimum design of trusses

  • Dizangian, Babak;Ghasemi, Mohammad Reza
    • Steel and Composite Structures
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    • v.21 no.5
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    • pp.1069-1084
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    • 2016
  • This paper introduces a new and effective design amplification factor-based approach for reliable optimum design of trusses. This paper may be categorized as in the family of decoupled methods that aiming for a reliable optimum design based on a Design Amplification Factor (DAF). To reduce the computational expenses of reliability analysis, an improved version of Response Surface Method (RSM) was used. Having applied this approach to two planar and one spatial truss problems, it exhibited a satisfactory performance.

The Calculus of Variations Applied to Stability of Slopes (사면안정에 응용되는 여러가지 계산법)

  • 김경진
    • Journal of the Korean Professional Engineers Association
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    • v.16 no.2
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    • pp.11-17
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    • 1983
  • This work presents a method for the determination of the safety factor of a slope based on the theory of the calculus of variations. The method allows for the determination of the critical sliding line (The one giving the minimum safety factor) without the necessity of guessing about its shape, which leads to a considerable economy of time and effort. Furthermore it gives the actual safety factor of the slape and consequently a more complete knowledge of the safety of the slope is obtained.

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Power Factor Correction Circuit For Inverter Air-Conditioner Using A Parallel Drive Method (병렬구동 방식을 이용한 인버터 에어컨용 역률제어회로)

  • 정용채;정윤철;권경안
    • Proceedings of the KIPE Conference
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    • 1998.11a
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    • pp.9-12
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    • 1998
  • In this paper, the power factor correction circuit using a parallel drive method is proposed so that the high power inverter air-conditioner with 3[ph] compressor motor may obtain the cost down and the improved performance. The adequate design procedures are presented to reduce the material costs by eliminating the power factor improving LC filter and derating output capacitor and inverter switches. Using the determined components, the prototype circuit with 6[kW] power consumption is built and tested to verify the operation of the proposed circuit.

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Q-Factor Measurement of a Dielectric Resonator in an MIC Environment Using Effective Dielectric Constant (유효 유전율을 이용한 MIC 구조에서의 유전체 공전기 양호도 측정)

  • 탁윤도;최준호;이주섭;김영식
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2000.11a
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    • pp.243-247
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    • 2000
  • In this parer, Q-factor measurement method for a dielectric resonator in an MIC environment using the effective dielectric constant is proposed. The effective dielectric constant technique is applied to both radial and axial directions. The proposed method shows that the accuracy of the Q-factor measurement is to be improved with 2% ~ 3% relative error.

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Calculation of Stres Intensity Factor in Arbitrarily Shaped Plane Crack by Mobius Transformation (뫼비우스 사상을 이용한 임의의 3차원 평면균열에서의 응력확대계수 계산)

  • An, Deuk-Man
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.4
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    • pp.734-740
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    • 2001
  • In this paper the stress intensity factor under uniform pressure in the arbitrarily-shaped plane crack configuration transformed elliptic crack by Mobius mapping are determined. Using Dysons formula Boussinesq-Papkovich potentials for mode I deformation are constructed. In the example the stress intensity factors are approximately calculated by least square method.