• 산업경영시스템학회지
• /
• 제41권2호
• /
• pp.174-183
• /
• 2018

In the industrial fields, the process capability index has been using to evaluate the variation of quality in the process. The traditional process capability indices such as $C_p$, $C_{pk}$, $C_{pm}$ and $C^+_{pm}$ have been applied in the industrial fields. These traditional process capability indices are mainly applied in the univariate analysis. However, the main streams in the recent industry are the multivariate manufacturing process and the multiple quality characteristics are corrected each other. Therefore, the multivariate statistical method should be used in the process capability analysis. The multivariate process indices need to be enhanced with more useful information and extensive application in the recent industrial fields. Hence, the purpose of the study is to develop a more effective multivariate process index ($MC_{pI}$) using the multivariate inverted normal loss function. The multivariate inverted normal loss function has the flexibility for the any type of the symmetrical and asymmetrical loss functions as well as the economic information. Especially, the proposed modeling method for the multivariate inverted normal loss function (MINLF) and the expected loss from MINLF in this paper can be applied to the any type of the symmetrical and asymmetrical loss functions. And this modeling method can be easily expanded from a bivariate case to a multivariate case.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2002년도 학술대회지
• /
• pp.78-84
• /
• 2002

건설 VE실무에서 기능분석은 VE이론과 달리 업무 자체가 누락되거나 요식적으로 적용되어 왔다. 이는 건설 VE활동의 시간적 제약, VE팀원의 훈련, 경험, 인식 부족 등과 함께 제조업 VE와 근본적으로 다른 건설 VE의 특성에 기인한 것으로 그동안의 국내 건선 VE 성과와 기능분석은 상호 연계되지 못하여 왔다. VE의 핵심인 기능분석이 제외된 건설 VE는 이론상으로 VE가 될 수 없는 모순점을 가지기 때문에 건설 VE실무와 이론의 차이를 좁히기 위해서는 우선 기능분석에서부터 그 해결책이 모색되어야 할 것이며, 이를 동해 건설 VE에 대한 인식의 전환 및 발전방향이 시도되어야 할 것이다. 이에 본 연구는 국내 건설 VE에서 활용되고 있는 기능분석의 방법과 절차, 그리고 적용시기의 문제점을 지적하고 건설 VE활동에서 기능분석의 활용과 효과를 극대화할 수 있는 기능분석 적용방안과 이때 유용하게 활용될 수 있는 전산 FAST 다이어그램 작성 모델(Easy-FAST)을 제안하였다.

• 산업기술연구
• /
• 제10권
• /
• pp.69-72
• /
• 1990

In this paper the numerical method for the study of wave reflection from and transmission through submerged permeable breakwaters using the boundary element method is developed. The numerical analysis technique is based on the wave pressure function instead of velocity potential because it is difficult to define the velocity potential in the each region arising the energy dissipation. Also, the non-linear energy dissipation within the submerged porous structure is simulated by introducing the linear dissipation coefficient and the tag mass coefficient equivalent to the non-linear energy dissipation. For the validity of this analysis technique, the numerical results obtained by the present boundary element method are compared with those obtained by the other computation method. Good agreements are obtained and so the validity of the present numerical analysis technique is proved.

• Journal of the Optical Society of Korea
• /
• 제20권6호
• /
• pp.762-769
• /
• 2016

The dynamic modulation transfer function (MTF) for image degradation caused by sinusoidal vibration is formulated based on a Bessel function of the first kind. The presented method makes it possible to obtain an analytical MTF expression derived for arbitrary frequency sinusoidal vibration. The error obtained by the use of finite order sum approximations instead of infinite sums is investigated in detail. Dynamic MTF exhibits a stronger random behavior for low frequency vibration than high frequency vibration. The calculated MTFs agree well with the measured MTFs with the slant edge method in imaging experiments. With the proposed formula, allowable amplitudes of any frequency vibration are easily calculated. This is practical for the analysis and design of the line-of-sight stabilization system in the remote sensing camera.

• 대한전기학회논문지:전력기술부문A
• /
• 제48권5호
• /
• pp.601-606
• /
• 1999

A Walsh function method is proposed in this report for the analysis and optimal control of linear time-delay systems, which is based on the Picard's iterative approximation and fast Walsh transformation. In this research, the following results are obtained: 1) The differential and integral equation can be solved by transforming into a simple algebraic equation as it was possible with the usual orthogonal function method: 2) General orthogonal function methods require usage of Walsh operational matrices for delay or advance and many calculations of inverse matrices, which are not necessary in this method. Thus, the control problems of linear time-delay systems can be solved much faster and readily.

• 한국해양학회지
• /
• 제28권3호
• /
• pp.192-201
• /
• 1993

쯔나미파에 의한 피해를 줄이기 위해서는 쯔나미파를 재현할 수 있는 방법의 개발 이 필요하다. 본 논문에서는 Sign Method를 도입하여 검조기에 기록된 쯔나미파를 분 석하고 재현해 봄으로써, 쯔나미파 분석에서의 Sign Method의 사용가능성을 검토하였 다. 쯔나미파의 시계열자료 Y(t)는 각 쯔나미의 발생특징을 반영하는 함수인 source evolution function E(t')와 파가 전파되는 지역의 특징을 나타내는 함수인 wave propagation function K9t-t')의 convolution 적분에 의해 나타낼 수 있다. Y(t)=.int. E(t')K(t-t')dt' 일본의 6개 지점과 한국의 9개 지점에서 기록된 1940년, 1964년, 1983년의 쯔나미파를 분석하여 sourve function 들과 wave function들을 구하 고, 두 함수를 이용하여 기록자료도 재현해 보았다. 우리 나라 동해안처럼 쯔나미의 진원지로부터 멀리 위치한 지역에서는 Sign Metho가 효과적인 방법임을 알 수 있었다. 또한, 기록되지 않은 쯔나미파도 인접지점의 source function 과 다른 시기의 쯔나미 에 대한 wave function을 이용하여 추정할 수 있다.

• 산업경영시스템학회지
• /
• 제19권40호
• /
• pp.329-339
• /
• 1996

This study presents the eigen ethnic function and mathematical processing method of human information. Human information can be definded as the overlap area taking the superposition property composed of intuition and sensory in stimulus/response (S/R) model, In S/R model, the intuition and sensory eigen ethnic function acts on the forming of perception. Perception process by the superposition property of intuition and sensory analogy to the basic neural network model. This analogy model extends to the analysis method. As an analysis method, optimal ratio number induced to the golden section ratio. Golden section ratio drived out by diverse source and implicated to the sensory and intuitive context such as beauty, harmony, optimality etc. This numerical orders can be applied to analysing the Perception process and extended to pursue the Potential human behavior, On the basic of proposed applying method, an illustrative mathematical examples are presented.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2000년도 춘계학술대회논문집A
• /
• pp.212-217
• /
• 2000

The reliable determination of the stress intensity factors for cracks in bolted Joints is needed to evaluate the safety and fatigue life of them widely used in mechanical components. The weight function method is an efficient technique to calculate the stress intensity factors for various loading conditions using the stresses of an uncracked model. In this paper the mixed-mode stress intensity factors for cracks in bolted joints are obtained by weight function method, in which the coefficients of weight function are determined by finite element analyses far reference loadings. The effects of the magnitude of clearance and factional coefficient on the stress intensity factors are investigated.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2005년도 춘계학술대회 논문집
• /
• pp.151-156
• /
• 2005

The objective of this study is to devise an accident scenario analysis method adept at creating accident scenarios at the Preliminary Hazard Analysis(PHA) step of a hazard analysis for railway system. This approach was inspired by the Quality Function Deployment(QFD) method, which is conventionally used in quality management and was used at the systematic accident scenario analysis(SASA) for the design of safer products. In this study, the QFD provides a formal and systematic schema to devise accident scenarios while maintaining objective. The accident scenario analysis method first identifies the hazard factors that cause railway accidents and explains the situation characteristics surrounding the accident. This method includes a feasibility test, a clustering process and a pattering process for a clearer understanding of the accident situation. Since this method enables an accident scenario analysis method to be performed systematically as well as objectively, this method is useful in building better accident prevention strategies. Therefore, this study can serve to reduce railway accident and be an effective tool for a hazard analysis.

• Journal of Mechanical Science and Technology
• /
• 제19권spc1호
• /
• pp.452-460
• /
• 2005

Based on an introduced optimal trajectory planning method, this paper mainly deals with the accuracy analysis during the function approximation process of the optimal trajectory planning method. The basis functions are composed of Hermit polynomials and Fourier series to improve the approximation accuracy. Since the approximation accuracy is affected by the given orders of each basis function, the accuracy of the optimal solution is examined by changing the combinations of the orders of Hermit polynomials and Fourier series as the approximation basis functions. As a result, it is found that the proper approximation basis functions are the $5^{th}$ order Hermit polynomials and the $7^{th}-10^{th}$ order of Fourier series.