• Structural Engineering and Mechanics
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• 제30권5호
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• pp.619-645
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• 2008

This study presents the efficiency of simulating structural systems using a method that combines a simplified component model (SCM) and rigorous component model (RCM). To achieve a realistic simulation of structural systems, a numerical model must be adequately capturing the detailed behaviors of real systems at various scales. However, capturing all details represented within an entire structural system by very fine meshes is practically impossible due to technological limitations on computational engineering. Therefore, this research develops an approach to simulate large-scale structural systems that combines a simplified global model with multiple detailed component models adjusted to various scales. Each correlated multi-scale simulation model is linked to others using a multi-level hierarchical modeling simulation method. Simulations are performed using nonlinear finite element analysis. The proposed method is applied in an analysis of a simple reinforced concrete structure and the Reuipu Elementary School (an existing structure), with analysis results then compared to actual onsite observations. The proposed method obtained results very close to onsite observations, indicating the efficiency of the proposed model in simulating structural system behavior.

• Journal of applied mathematics & informatics
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• 제8권3호
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• pp.889-897
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• 2001

Based on the prime graph of a finite simple group, its order is the product of its order components (see[4]). It is known that Suzuki-Ree groups [6], $PSL_2(q)$ [8] and $E_8(q)$ [7] are uniquely deternubed by their order components. In this paper we prove that the simple groups $A_p$ are also unipuely determined by their order components, where p and p-2 are primes.

• 한국공간정보시스템학회:학술대회논문집
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• 한국공간정보시스템학회 2000년도 학술회의 논문집 3권2호
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• pp.139-153
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• 2000

지리 정보 시스템을 위한 공간 데이터베이스 관리시스템간의 이질성을 최소화하고 공간 데이터의 호환성이나 상호 연동성을 높일 수 있도록 OGC에서 OpenGIS의 사양을 정의하였다. 본 연구에서는 OpenGIS에서 정의된 공간 데이터 모델을 지원하는 컴포넌트를 구현한 것이다. 즉, OpenGIS에서 요구되어진 사양에 따라 SFG (Simple Feature Geometry) 컴포넌트를 구현하였다. 본 논문에서는 컴포넌트 구현상의 발생되었던 문제점과 이 해결 방법을 제시한다. 또한 구현 도중에 발견된 OpenGIS SFG의 사양 자체의 문제점도 함께 제시한다.

• 디지털콘텐츠학회 논문지
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• 제3권2호
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• pp.245-254
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• 2002

현재, 자동화 시스템을 위한 통신분야는 TCP/IP를 기반으로 하는 네트워크 기반 원격제어 부분과 시스템의 각 내부 장치들간의 통신을 위한 간단한 직렬통신으로 나뉠 수 있다. 네트워크의 비약적인 발전에도 불구하고 내부 제어를 위한 통신부분은 현재까지 간단한 RS232기반을 사용하고 있다. 또한, 시스템의 개발기법은 각 기능단위의 모듈러 프로그래밍 기법에서 객체지향 프로그램으로 발전하였으며, 현재는 소프트웨어의 부품단위인 컴포넌트 기반 개발기법으로 발전하였다. 이는, 비즈니스 로직을 포함하는 독립적인 운영단위를 조립하며 새로운 시스템의 개발로 이어지는 기법으로서 소프트웨어 개발기법의 새로운 대안으로 제시되고 있다. 따라서, 본 연구는 컴포넌트 기반의 개발 기법을 적용한 GUI기반의 RS232C에서의 내부통신 Emulate를 구현하였다. 이는, 수신부와 송신부로 나뉘어지는 통신 제어부분을 컴포넌트화 하였으며, 이를 합성함으로서 제어부에서는 송,수신 데이터의 핸들링을 담당하도록 하였다.

• Structural Engineering and Mechanics
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• 제54권2호
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• pp.379-392
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• 2015

A number of acceleration-based damage detection methods have been developed but they have not been widely applied in engineering practices because the acceleration response is insensitive to minor damage of civil structures. In this article, a damage detection approach using the long-gauge strain sensing technology and the principle component analysis technology is proposed. The Long gauge FBG sensor has its special merit for damage detection by measuring the averaged strain over a long-gauge length, and it can be connected each other to make a distributed sensor network for monitoring the large-scale civil infrastructure. A new damage index is defined by performing the principle component analyses of the long-gauge strains measured from the intact and damaged structures respectively. Advantages of the long gauge sensing and the principle component analysis technologies guarantee the effectiveness for structural damage localization. Examples of a simple supported beam and a steel stringer bridge have been investigated to illustrate the successful applications of the proposed method for structural damage detection.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.63-67
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• 2004

The problem is improving the positioning precision of a permanent magnet linear synchronous motor (PMLSM). Thus, this paper presents the design and realization of an adaptive dither to reduce the force ripple in PMLSM. A composite control structure is used, consisting of three components: a simple feed-forward component, a PID feedback component and an adaptive feed-forward compensator (AFC). Especially adaptive feed-forward component cancel out detent force using wavelet transformation. Computer simulation results verify the effectiveness of the proposed scheme for high precision motion trajectory tracking using the PMLSM

• 응용통계연구
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• 제10권2호
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• pp.275-291
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• 1997

직접측정이 불가능한 단일 상위목표개념을 직접측정이 가능한 관련 하위개념들을 이용하여 간접적으로 측정한 경우, 많은 연구자들이 비록 모호하나마 연구초기에 이해했던 목표개념과 관련개념들간의 관계를 자료분석의 단계에서 구체화하지 못하고, 목표개념의 점수화를 편의성에 의존한다거나 통계분석자에게 일임해 버리는 경향이 있다. 그러나 사용된 점수화 방법에 대한 객관성이 결여되면 그릇된 정보가 도출되거나 연구결과가 독자들로부터 수용되어지지 못할 수도 있다. 본 연구에서는 이러한 상황에서 측정이론에 충실하면서 목표개념의 조작적 정의를 어느정도 객관화할 수 있는 한 방법을 제안하고, 이에 바탕을 둔 대표성분점수화법의 타당성 및 활용성에 관해 연구하였다.

• Journal of information and communication convergence engineering
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• 제9권5호
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• pp.505-509
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• 2011

This paper attempts to classify known facial expressions and to establish the correlations between two regions (eye + eyebrows and mouth) in identifying the six prototypic expressions. Covariance is used to describe region texture that captures facial features for classification. The texture captured exhibit the pattern observed during the execution of particular expressions. Feature matching is done by simple distance measure between the probe and the modeled representations of eye and mouth components. We target JAFFE database in this experiment to validate our claim. A high classification rate is observed from the mouth component and the correlation between the two (eye and mouth) components. Eye component exhibits a lower classification rate if used independently.

• 한국통신학회논문지
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• 제31권9C호
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• pp.876-881
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• 2006

In this paper, we propose a complex-valued IIR filter for digital VSB signals based on CMA in order to efficiently mitigate multipath distortions, especially the leakage from the quadrature component. The proposed equalizer overcomes the drawback of the conventional real-valued IIR equalizers that it attempts to equalize Hilbert transform of quadrature component. We demonstrate via simulation that the proposed complex IIR filter successfully mitigates the leakages from the quadrature component, while the conventional real IIR filter requires a longer IIR filter to achieve the same performance. We present cost function analysis for a simple two-tap case showing that the proposed IIR equalizer with CMA for VSB signals has a global minimum at the desired location.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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• pp.276.3-277
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• 2003

A simple, accurate GC analytical technique for the determination of phthalates. commonly used as plasticizers during the manufacturing process of PVC bags, in blood component preparations was developed and validated. The blood component preparations were extracted with n-hexane. The n-hexane layer was evaporated to dryness and the residue was dissolved in 1 $m\ell$ of n-hexane and analyzed by GC and GC/MS. (omitted)