• Structural Engineering and Mechanics
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• 제30권6호
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• pp.665-678
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• 2008

The beams components subjected to the loading such as axial, bending and cyclic thermal loads were studied in this research. The used constitutive equations are those of elasto-plasticity coupled to ductile and/or creep damage. The nonlinear kinematic hardening behavior was considered in elastoplasticity modeling. The unified damage law proposed for ductile failure and fatigue by the author of Sermage et al. (2000) and Kachanov's creep damage model applied to cyclic creep and low cycle fatigue of beams. Based on the results of the analysis, the shakedown limit loads were determined through the calculation of the residual strains developed in the beam analysis. The iterative technique determines the shakedown limit load in an iterative manner by performing a series of full coupled elastic-plastic and continuum damage cyclic loading modeling. The maximum load carrying capacity of the beam can withstand, were determined and imposed on the Bree's interaction diagram. Comparison between the shakedown diagrams generated by or without creep and/or ductile damage for the loading patterns was presented.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 춘계학술대회 논문집
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• pp.198-201
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• 1997

The new system for identification of organic vapours and analysis method of mechanism between organic vapours and sensitive materials were attempted using the resonant resistance and resonant frequency of Quartz Crystal Analyzer (Q. C. A.). The resonant resistance shift means rheological changes in sensitive LB films occurred by the adsorption of organic vapours, while the resonant frequency shift represent the mass of organic vapour loaded in or on the sensitive LB films. It is thought that we can obtain more accurate response mechanism of organic vapour using the resonant frequency and resonant resistance diagram. The polymeric sensitive material were quantitively depositied using the LB method. In the experimental results, the adsorption behavior of organic vapour response can be decided by two type ; surface adsorption and penetration into sensitive material. Organic vapours had different positions in the Frequency-Resistance (F-R) diagram as to the kinds and concentrations of organic vapours. Thus F-R diagram can be applied to the development of one channel gas sensing system using the Quartz Crystal Analyzer.

• Food Science and Biotechnology
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• 제14권2호
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• pp.301-303
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• 2005

State diagram of highly concentrated branched oligosaccharides (HBOS) was constructed to better understand phase behavior of mixtures with different size of oligosaccharides. It showed dramatic plasticizing effect on glass transition, which was successfully described based on Couchman-Karasz equation model. $T_g$' estimated from state diagram corresponded well with previous empirical data measured by maximum ice formation through isothermal holding (annealing) process. Estimated $T_g$' and $C_g$' values were $-36.3^{\circ}C$ and 79.99%, respectively. $T_g$' value of HBOS was approximately $10^{\circ}C$ higher than that of sucrose, while $C_g$' value was similar to those of general carbohydrate materials, which could be useful for applications in frozen system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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• pp.261-263
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• 1996

The study on the development of one-channel gas sensor using the quartz crystal analyzer were attempted. The adsorption and desorption behavior of organic gases were investigated using the resonant frequency and resistance method of quartz crystal. The sensitive materials were deposited on the quartz crystal analyzer(QCA) by using Langmuir-Blodgett method. To investigate the response characteristics of organic vapours and response mechanism, resonant frequency-resonant resistance (F-R) diagram was used. In our experimental results, the response mechanism between sensitive LB film and organic vapours was obtained using F-R diagram. And the position of each organic vapour were different as to the kind and injection amount. Thus F-R diagram can be applied to one-channel gas sensor using the QCA and useful to analyze the response mechanism between organic vspours and sensitive LB films.

• 한국주조공학회지
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• 제23권5호
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• pp.276-285
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• 2003

In the undercooled melt of $Pd_{40}Cu_{30}Ni_{10}P_{20}$ alloy, the solidification behavior including nucleation and growth of crystals at the micrometer level has been observed in-situ by use of a confocal scanning laser microscope combined with an infrared image furnace. The $Pd_{40}Cu_{30}Ni_{10}P_{20}$ alloy specimens were cooled from the liquid state to glass transition temperature. 575 K, at various cooling late under a helium gas flow. According to the cooling rate, the morphologies of the solidification front are changed among various types, irregular jog like front, columnar dendritic front, cellular grain, star like shape jog and fine grain, etc. The velocities of the solid-liquid interface are measured to be $10^{-5}{\sim}10^{-8}$ m/s which are at least two orders higher than the theoretical crystal growth rates. Combining the morphologies observed in terms of cooling rates and their solidification behaviors, we conclude that phase separation takes place in the undercooled molten $Pd_{40}Cu_{30}Ni_{10}P_{20}$ alloy. The continuous cooling transformation (CCT) diagram was constructed from solidification onset time at various linear cooling conditions with different rate. The CCT diagram suggests that the critical cooling rate for glassy solidification is about 1.5 K/s, which is in agreement with the previous calorimetric findings.

• 한국정보과학회논문지:소프트웨어및응용
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• 제27권4호
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• pp.357-369
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• 2000

SMIL(Synchronized Multimedia Integration Language)는 멀티미디어 객체의 집합으로 시간적인 동기화를 표현할 수 있는 마크업 언어이다. 본 연구에서는 SMIL 문서를 시간에 따라 동기화 표현을 명확히 할 수 있도록 객체 지향 기반의 시각화 도구인 UML의 사용 사례(Use case), 순서(Sequence), 다이어그램을 이용한 객체 모델링 방법을 제안한다. 이를 위해 SMIL 문서에서 UML 사용사례와 순서 다이어그램으로의 사상 규칙과 알고리즘, 형식 모델, 그리고, 모델링 함수를 제안한다. 본 연구의 의의는 SMIL 문서 개발자들이 손쉽게 문서 구조 파악 및 개발을 할 수 있으며, 형식 모델과 다이어그램 모델링 함수는 객체지향 데이타베이스 문서 관리의 기반이 된다는 것이다.

• 한국컴퓨터정보학회논문지
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• 제10권3호
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• pp.161-171
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• 2005

SMIL(Synchronized Multimedia Integration Language)는 멀티미디어 객체들을 시간적인 동기화를 표현할 수 있는 마크업 언어이다. 본 연구에서는 SMIL 문서의 편집기 개발을 위해 시간에 따라 동기화 표현을 명확히 할 수 있는 도구인 UML의 사용 사례(Use case), 순서(Sequence), 다이어그램을 이용한 객체 모델링 방법을 제안한다. 이를 위해 SMIL 문서에서 UML 사용사례와 순서 다이어그램으로의 사상 규칙과 알고리즘, 형식 모델, 그리고, 모델링 함수를 제안한다. 본 연구의 의의는 손쉽게 SMIL 문서 편집기 개발을 할 수 있고, 형식 모델과 다이어그램 모델링 함수는 객체지향 데이터베이스 문서 관리의 기반이 된다는 것이다.

• Journal of Magnetics
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• 제19권4호
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• pp.315-322
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• 2014

In this work, Artificial Neural Network (ANN) was used to model the dynamic behavior of ferromagnetic hysteresis derived from performing the mean-field analysis on the Ising model. The effect of field parameters and system structure (via coordination number) on dynamic critical points was elucidated. The Ising magnetization equation was drawn from mean-field picture where the steady hysteresis loops were extracted, and series of the dynamic critical points for constructing dynamic phase-diagram were depicted. From the dynamic critical points, the field parameters and the coordination number were treated as inputs whereas the dynamic critical temperature was considered as the output of the ANN. The input-output datasets were divided into training, validating and testing datasets. The number of neurons in hidden layer was varied in structuring ANN network with highest accuracy. The network was then used to predict dynamic critical points of the untrained input. The predicted and the targeted outputs were found to match well over an extensive range even for systems with different structures and field parameters. This therefore confirms the ANN capabilities and indicates the ANN ability in modeling the ferromagnetic dynamic hysteresis behavior for establishing the dynamic-phase-diagram.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 1998년도 가을 학술발표논문집 Vol.25 No.2 (2)
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• pp.213-215
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• 1998

가상현실 시스템을 구현하고자 할 때, 그 환경에 존재하는 개체(entity)들의 복잡한 행위(behavior)를 설계 및 기술하는 것이 쉽지 않을 뿐만 아니라, 사용자와의 상호작용까지 고려한다면 매우 복잡하게 된다. 게다가, 이러한 행위와 상호작용의 설계 및 기술에 대한 정형화된 도구조차 찾기 어려운 것이 사실이다. 이 논문에서는 이러한 행위를 설계할 때, 소프트웨어 공학에서 이용되고 있는 도구 중 하나인 Statecharts와 DFD(Data Flow Diagram)을 기반으로 하는 ASADAL/SIM을 이용하여 설계하고 구현한 예를 들어 프로그래밍이 아닌 다른 도구를 통한 가상환경 내의 개체들의 행위 설계와가 가능함을 보이고, 그로 인해 얻을 수 있는 여러 장점에 관하여 소개한다.

• 대한간호학회지
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• 제45권5호
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• pp.723-732
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• 2015

Purpose: The purpose of this study was to develop a system dynamics model for adolescent obesity in Korea that could be used for obesity policy analysis. Methods: On the basis of the casual loop diagram, a model was developed by converting to stock and flow diagram. The Vensim DSS 5.0 program was used in the model development. We simulated method of moments to the calibration of this model with data from The Korea Youth Risk Behavior Web-based Survey 2005 to 2013. We ran the scenario simulation. Results: This model can be used to understand the current adolescent obesity rate, predict the future obesity rate, and be utilized as a tool for controlling the risk factors. The results of the model simulation match well with the data. It was identified that a proper model, able to predict obesity probability, was established. Conclusion: These results of stock and flow diagram modeling in adolescent obesity can be helpful in development of obesity by policy planners and other stakeholders to better anticipate the multiple effects of interventions in both the short and the long term. In the future we suggest the development of an expanded model based on this adolescent obesity model.