• 한국항만학회지
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• 제11권2호
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• pp.257-271
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• 1997

The calculation of earthwork plays a major role in plan or design of many civil engineering projects and thus it has become very important to advanced the accuracy of earthwork calculation. The purpose of this paper is to calculate the excavation volume of terrain using a proposal area formular in eathwork volume determination for reclamation of the harbor. A proposal area formular by first and third equation is compared with end area, middle area, prismoidal formula by trapezoidal, simpson formular to excavation volume for an experimental terrian $1\sim12$. As a result of this study, algorithm of a proposal area formula by prismoidal formula should provide a better accuracy than end area, middle area, prismoidal formula by trapezoidal formular, simpson formular.

• 대한가정학회지
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• 제35권4호
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• pp.95-110
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• 1997

According to the design method for constructing the crotch angle of traditional Korean men's trousers there are differences in from after its completion. Since there is no standardization of visual & aesthetic pattern for the construction method which is stablished by the calculation formular of waist girth hip girth pantleg end and upper outer leg length it is difficult to be used for educational use or for teaching materials. Therefore the purpose of this project according to five models in proportion to the physical standard of Korea in ages from 24 to 29 years old is to establish a design criterion and the standardization of construction methods by introduction the pant construction method of the crotch angle by converting the sitting posture length to seaming crotch center point both knees width in the Korean way of sitting. The production method for the pattern design is as follow: (1) The waist girth formular is {{{{ { w} over {4 } }}}}+{{{{ {w} over {10 } }}}}(2) The hip girth formular is {{{{ {H } over { 4} }}}}+{{{{ {H } over {5 } }}}}(3) The pantleg end formular is {{{{ {H } over {4 } }}}}(4) A crotch angle is fixed at 70 degress.(5) The ratio of outer leg length to leg width is 5:8 (6) The component ratio of the upper outer leg length to the pant length in 5:8(7) The ratio of the division point of front / right inner leg length and left inner leg width to upper outer leg length is 5 : 8

• The Journal of Korean Physical Therapy
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• 제13권2호
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• pp.257-264
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• 2001

To take the Far-infrared(FIR) ray which is a optimized wavewlength and strength, at first, it is to be induced the characteristic algorithm and the computerized programing of FlR radiating materials. In this study, we induced that the formular of optimized FIR with physical, mathematical logic and theory, especially, Plank, Kirchhoff, Wien, Stefan-Boltzmann's logic and law. In the long run the formular was induced with mathematical integration. since we had to know the molecular wavelength. Base on the induced formular as above, we programmed the optimized FlR radiating computerized program, it would be useful to design semiconductor( VLSI) as the FlR instrument center control system.

• 한국실내디자인학회논문집
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• 제21권1호
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• pp.95-102
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• 2012

This study analyzed the observation characteristics with the subject of observation data through defining the change of the observation degree as attention /conscious observation /visual understanding. Furthermore, by obtaining the formular with which to estimate the subjects' observation amount, this study suggests a potential method for easier analysis of observation characteristics. The conclusions from the study are as the followings. First, the observation frequency was being generated with wide deviation among subjects while there was a flow-on characteristics depending on the degree of observation. These characteristics enabled the study to obtain the formular with which to estimate the observation amount. Second, the study could establish the area frequency by grade from the entire observation data. The area I was at most 4% for the area frequency but accounted for 18.2% of the entire effective observation time, and the area II 16% and 38.7% respectively. Accordingly, only considering the observation area distribution of the area I or the areas I and II shows which position of the space the subjects were observing. Third, with the subject of the relatively higher observation time at at the subject's observation characteristics, as the observation phase was getting higher, the observation time decreased more. Forth, by obtaining the formular to estimate the observation amount for observation data according to the change of observation degree, the study could find the estimating observation characteristics of additional subjects. The formular shortens the analysis time and facilitates the analysis process.

• Journal of Electrical Engineering and Technology
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• 제13권6호
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• pp.2561-2567
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• 2018

The extension of DC battery backup time in the DC power supply system of nuclear power plants (NPPs) remains a challenge. The lead-acid battery is the most popular at present. And it is generally the most popular energy storage device. However, extension of backup time requires too much space. The lithium-ion battery has high energy density and advanced gravimetric and volumetric properties. The aim of this paper is development of the sizing formula of stationary lithium-ion batteries. The ongoing research activities and related industrial standards for stationary lithium-ion batteries are reviewed. Then, the lithium-ion battery sizing calculation formular is proposed for the establishment of industrial design standard which is essential for the design of stationary batteries of nuclear power plants. An example of calculating the lithium-ion battery capacity for a medium voltage UPS is presented.

• 한국강구조학회 논문집
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• 제25권5호
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• pp.475-486
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• 2013

본 연구는 압축가새의 변형을 FLD부분에 집중시켜 압축가새의 좌굴안정성을 확보하는 슬릿형 FLD에 관한 것이다. 4개 및 8개의 슬릿형 실험체를 슬릿길이 별로 단순압축실험하였다. 그 결과를 유한요소해석과 비교 검토하여 해석의 유효성을 입증하였다. 또한 전단면을 구성하는 단위요소를 이상화된 샌드위치 단면으로 치환하여, 슬릿개수와 슬릿길이를 변수로 하는 압축력과 축방향 변형의 관계식을 유도하였다. 이 식은 주어진 범위 내에서 실험결과와 좋은 대응을 보인다. 본 연구는 FLD설계의 기본데이터로써 이용 될 수 있다.

• 한국지진공학회논문집
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• 제22권2호
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• pp.55-62
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• 2018

In this study, natural period formular is presented for a RC shear wall structure with H-, T-, and L-shaped wall sections. The natural period formular proposed by Goel and Chopra and adopted in ASCE 7-10 was modified by using the ratio of the flange and web wall area. The natural periods of structures with H-shaped wall were numerically obtained, the results indicated that the ASCE 7-10 could not consider the natural period variation according to the length of the flange wall, but the proposed formula could do. Especially, ASCE 7-10 estimated much longer periods than eigenvalue analysis, and this implies that conservative seismic design is difficult. The periods by eigenvalue analysis exist between the upper and lower bounds given by the proposed formula, and conservative design is possible by using the proposed lower bound value. In order to verity the effectiveness of the proposed method, actual residential buildings with various types of flange walls are considered. Ambient vibration tests, eigenvalue analyses, and nonlinear dynamic analyses were conducted and the periods were compared with the values by ASCE 7-10 and the proposed formula. The results showed that the proposed formula could estimate more accurately the periods than ASCE 7-10.

• 한국지반환경공학회 논문집
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• 제9권1호
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• pp.41-46
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• 2008

본 연구에서는 대심도 연약지반에서 PHC말뚝을 항타관입한 후 일정기간 이후 정재하시험을 통한 하중전이분석을 실시하였다. 하중전이분석에서 단위주면마찰력은 상부의 사질토에서 $7.4t/m^2$, 심도 14m에서 33m의 점성토구간에서는 $6.4t/m^2$, 말뚝선단부가 근입된 사질토에서는 $23.3t/m^2$이 발휘되었으며, 단위선단지지력은 $955t/m^2$으로 실측되었다. 전이된 단위주면마찰력과 국내외에서 알려져 있는 정역학적 지지력산정식과의 비교를 해본 결과 토층별로 가장 적합한 공식을 선정한다면, 사질토의 단위주면마찰력의 경우 한국지반공학회의 구조물기초설계기준 및 해설이, 점성토의 단위주면마찰력의 경우 철도청의 철도설계기준이 가장 실측치에 근접한 값을 나타내었다.

• 한국전산구조공학회논문집
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• 제23권1호
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• pp.53-60
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• 2010

ILM 교량의 경우 압출 중에 발생하는 일시적 응력을 흡수하기 위해 일반적으로 압출추진코가 이용된다. 압출 중에 발생되는 ILM 교량의 상부단면력은 압출추진코의 길이, 중량, 강성에 따라 크게 달라진다. 따라서 설계와 시공시에 단면의 안전성 확보를 위해서는 상부구조와 압출추진코와의 상호작용에 따른 응력변화를 반드시 고려해야 한다. 그러나 국내에서는 ILM 교량의 설계시에 경간분할 및 지간길이 등을 전례의 설계결과에 따라 결정하는 경우가 많다. 따라서 상부구조와 압출추진코의 단면들이 프로젝트에 따라 크게 달라지지 않는다. 그러므로 상부단면의 최적설계에 영향을 주는 압출 중 상호작용을 고려한 압출추진코의 최적설계에 관한 필요성도 크게 인식되지 못하고 있는 실정이다. 이 연구에서는 변단면 압출추진코와 교량 상부구조의 상호작용을 고려한 해석식을 이용하여 압출추진코의 최적화를 위한 설계식을 제안하였고 활용가능성을 확인하였으며, 국내 공용중인 ILM 교량의 설계수준을 평가하여 ILM 상부단면의 최적설계를 위해 제언하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2002년도 추계종합학술대회
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• pp.363-367
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• 2002

컴퓨터를 이용한 전자문서처리에 이용되는 기존의 문서편집 시스템에서는 비구조적인 문서구조를 다루게 됨으로써 시스템 내에서 사용되는 수학식의 표현은 이미지나 텍스트 등의 비구조적인 방법에 의해 표현되거나 처리된다. 이렇게 사용된 수학식은 문서의 가독성과 재사용성 그리고 문서의 처리와 교환에 상대적인 불편을 초래하게 된다. 그러므로 이러한 단점을 극복하고 효율적으로 구조적인 문서상에 MathML(Mathematical Markup Language) 수식 구조를 적용시킬 수 있는 문서편집 시스템이 요구된다. 이에 본 논문에서는 MathML을 기반으로 한 수학식의 표현을 구조적으로 처리할 수 있는 MathML 수식 편집이 가능한 XML(eXtensible Markup Language) 기반의 구조적 문서생성을 위한 문서 편집 시스템을 설계 및 구현하였다.