• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
• /
• pp.349-349
• /
• 2005

수동소자를 PCB(Printed Circuit Board) 안으로 집적하기 위한 방법의 일환으로 polymer-metal, polymer-ceramic composite에 연구가 국내외 연구 국내외 연구기관에서 광범위하게 진행되고 있다. 본 연구에서는 polymer-metal-ceramic composite 에서 PZT-coated Ni의 volume fraction에 따른 유전율 변화에 대하여 조사하였다. 원료로는 PZT(52/48) solution. 니켈금속분말, PMMA(polymethyl methacrylate)를 사용하였다. 전기적 특성은 임피던스분석기를 이용하여 측정하였으며 mixing rule과 percolation theory를 이용하여 결과를 해석하였다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1993년도 추계학술대회 논문집
• /
• pp.666-671
• /
• 1993

Fatigue life prediction under multi-axial variable load were performed for Aluminium 7075-T651 alloy using SAE Notched specimen & Torque tube shaft component specimen. When variable multiaxial load is applied to material, maximum damaged plane(critical plane) change. To clarify the situation, experiment is performed on two different changing load path. For multiaxial fatigue life prediction, miner rule is expanded to critical plane theory. Shear based parameter and Elliptical parameter give better correlation. This suggests that miner rule can be applicable on multi-axial variable load.

• 대한수학회지
• /
• 제42권1호
• /
• pp.17-35
• /
• 2005

Necessary conditions for a deterministic optimal control problem which involves states constraints are derived in the form of a maximum principle. The conditions are similar to those of F.H. Clarke, R.B. Vinter and G. Pappas who assume that the problem's data are Lipschitz. On the other hand, our data are not continuously differentiable but only differentiable. Fermat's rule and Rockafellar's duality theory of convex analysis are the basic techniques in this paper.

• 음성과학
• /
• 제4권1호
• /
• pp.59-80
• /
• 1998

In this article are proposed a theory of the French syllable and a rule of French liaison within the dependency phonology framework. The treatment offered assumes that the notion of 'floating' or 'extrametrical' segment allows for a better description than competing alternatives based on truncation or insertion. This rule was based on the consequences of positing floating segments for the structure of lexical entries and underlying phonological representations. I have described the phenomenon of French liaison and shown that insights normally associated with metrical and 'autosegmental' accounts could naturally be integrated within the syllable structure.

• 한국지능시스템학회논문지
• /
• 제1권2호
• /
• pp.16-34
• /
• 1991

It has been widely accepted that expert systems must reason from multiple sources of information that is to some degree evidential - uncertain, imprecise, and occasionally inaccurate - called evidential information. Evidence theory (Dempster/Shafet theory) provides one of the most general framework for representing evidential information compared to its alternatives such as Bayesian theory or fuzzy set theory. Many expert system applications require evidence to be specified in the continuous domain - such as time, distance, or sensor measurements. However, the existing evidence theory does not provide an effective approach for dealing with evidence about continuous variables. As an extension to Strat's pioneeiring work, this paper provides a new combination rule, a new method for mass function transffrmation, and a new method for rendering joint mass fuctions which are of great utility in evidence theory in the continuous domain.

• Asian-Australasian Journal of Animal Sciences
• /
• 제21권11호
• /
• pp.1559-1571
• /
• 2008

A rule was developed to constrain the annual rate of inbreeding to a predefined value in a population with different lifetimes between sires and dams, and to maximize the selection response over generations. This rule considers that the animals in a population should be divided into sex-age classes based on the theory of gene flow, and restricts the increase of average inbreeding coefficient for new offspring by limiting the increase of the mean additive genetic relationship for parents selected. The optimization problem of this rule was formulated as a quadratic programming problem. Inputs for the rule were the BLUP estimated breeding values, the additive genetic relationship matrix of all animals, and the long-term contributions of sex-age classes. Outputs were optimal number and contributions of selected animals. In addition, this rule was combined with the optimization of emphasis given to QTL, and further increased the genetic gain over the planning horizon. Stochastic simulations of closed nucleus schemes for pigs were used to investigate the potential advantages obtained from this rule by combining the standard QTL selection, optimal QTL selection and conventional BLUP selection. Results showed that the predefined rates of inbreeding were actually achieved by this rule in three selection strategies. The rule obtained up to 9.23% extra genetic gain over truncation selection at the same rates of inbreeding. The combination of the extended rule and the optimization of emphasis given to QTL allowed substantial increases in selection response at a fixed annual rate of inbreeding, and solved substantially the conflict between short-term and long-term selection response in QTL-assisted selection schemes.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2007년도 추계학술대회 논문집
• /
• pp.1529-1532
• /
• 2007

Failure Mode, Effects, and Criticality Analysis (FMECA) is an extension of FMEA which includes a criticality analysis. The criticality analysis is used to chart the probability of failure modes against the severity of their consequences. The result highlights failure modes with relatively high probability and severity of consequences, allowing remedial effort to be directed where it will produce the greatest value. However, there are several limitations. Measuring severity of failure consequences is subjective and linguistic. Since The result of FMECA only gives qualitative and quantitative informations, it should be re-analysed to prioritize critical units. Fuzzy set theory has been introduced by Lotfi A. Zadeh (1965). It has extended the classical set theory dramatically. Based on fuzzy set theory, fuzzy logic has been developed employing human reasoning process. IF-THEN fuzzy rule based assessment approach can model the expert's decision logic appropriately. Fault tree analysis (FTA) is one of most common fault modeling techniques. It is widely used in many fields practically. In this paper, a simple fault tree analysis is proposed to measure the severity of components. Fuzzy rule based assessment method interprets linguistic variables for determination of critical unit priorities. An rail-way transforming system is analysed to describe the proposed method.

• 한국게임학회 논문지
• /
• 제15권1호
• /
• pp.35-44
• /
• 2015

본 논문의 목적은 온라인 게임에서 나타나는 사용자 생성 규칙의 양상 및 특징을 분석하고, 이를 통해 게임 내에서 플레이어의 정체성이 형성되는 방식을 밝히는 것이다. 이를 위해 유즈맵 시스템에서 기원한 온라인 게임 <리그 오브 레전드>를 연구 대상으로 채택하고, 규칙 이론을 바탕으로 사용자에 의해 만들어진 규칙의 양상을 분석하였다. 그 결과 게임 내에서 지배적으로 나타나는 규칙은 개발자가 만든 규칙이 아닌 사용자로부터의 창발적인 규칙에 있었다. 그리고 이러한 사용자 생성 규칙은 규칙 발견과 다수 사용자에 의한 선택의 과정을 거치면서 궁극적으로 시스템의 상태 변화까지 이끌어낸다. 본 논문에서의 사용자 생성 규칙에 관한 연구는 게임 내에서의 사용자 역할을 제고할 수 있도록 한다는 측면에서 의의를 가질 것으로 기대한다.

• 한국통신학회논문지
• /
• 제27권3A호
• /
• pp.221-230
• /
• 2002

본 논문에서는 마코프 랜덤 필드를 이용해 움직이는 객체를 분할하는 새로운 방법을 제안하였다. 제안된 방법은 신호 탐지 이론에 기반을 두고 있다. 즉, 영상에서의 모션의 존재 유무는 binary decision rule에 의해 결정되고 잘못된 결정은 마코프 랜덤 필드 모델에 의해 수정된다. 전체적인 분할 과정은 2단계로 나뉘어진다. 첫 단계는 '모션탐지' 단계이며, 두번째 단계는 '객체분할' 단계이다. '모션탐지' 단계에서는 optical flow에 의해 발생하는 속도 벡터들에 대하여 binary decision rule을 적용하여 모tus의 존재 유무를 결정하는 과정이다. '객체분할' 단계에서는 첫 단계에서 원치 않게 발생하는 잡음을 제거한다. 이때 마코프 랜덤 필드로 가정하고 베이스 규칙에 의해 잡음을 제거한다. 실험결과, 연속영상에서 움직이는 객체의 영역을 효율적으로 분할함을 확인할 수 있었다.

• 복합신소재구조학회 논문집
• /
• 제1권4호
• /
• pp.13-17
• /
• 2010

A post-tensioned slab bridge is analyzed by the specially orthotropic theory. Each longitudinal and transverse steel layer is regarded as a lamina, and material constants of each lamina is calculated by the use of rule of mixture. This slab bridge with simple support is under uniformly distributed vertical and axial loads. In this paper, the finite difference method and the beam theory are used for analysis. The result of beam analysis is modified to obtain the solution of the plate analysis. The result of this paper can be used for post-tensioned slab bridge analysis by the engineers with undergraduate study in near future.