• Korean Journal of Materials Research
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• v.8 no.2
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• pp.154-160
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• 1998

다양한 제조 공정하에서 기판위에 형성되는 이중층은 공학적인 관점으로 볼 때 매우 중요한 미세 조직들 중의 하나이다. 이중에서도 고온 산화시에 형성되는 이중층에 관하여는 많은 이론들이 있다. 이 논문에서는 이들 이론들에 대한 가정 및 이론 전개에 대한 고찰을 통해 이들 이론들을 검증하였다. 또 산화 이중층을 진공 박막 제조 및 응고시 형성되는 이중층들과 비교하였다.

• Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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• v.3
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• pp.151-183
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• 2001

이 논문은 독일어의 연구개비음의 실현을 최적성이론의 관점에서 설명한다. 종래의 규칙이론에서는 파생어 Sprengung, hungrig 등에서 /g/가 두번째 음절의 음절머리 (onset)로 실현되지 않는 이유를 /g/삭제 규칙의 순환적인 적용을 통해 설명한다. 그러나 이 논문은 그 이유가 형태적으로 관련된 두 개의 단어사이의 대응관계에 의한 결과임을 보임으로써 규칙이론의 순환적용이 설명하지 못하는 중요한 사실을 포착한다: 파생어에서 /g/가 탈락되는 경우는 오직 이를 통해 파생어와 그 어기간의 음운적인 유사성이 커질 때만으로 한정된다

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.3
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• pp.1-5
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• 2006

Birds and insect in nature morph their mean camberline shapes to obtain both lift and thrust simultaneously. Previous unsteady thin airfoil theories were derived mainly for a rigid flapping airfoil. An extended unsteady thin airfoil theory for a deformable airfoil is required to analyze the unsteady two-dimensional aerodynamic characteristics of a biomorphing wing. Theodorsen's approach is extended to calculate the unsteady aerodynamic characteristics of a biomorphing airfoil. The mean camberline of the airfoil is represented as a polynomial. The unsteady aerodynamic characteristics of the morphing airfoil are represented as noncirculatory and circulatory terms. Present theory can be applied to the unsteady aerodynamic analysis of a flapping biomorphing airfoil and the aeroelastic analysis of a morphing wing.

• Journal of Korean Society of Transportation
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• v.17 no.2
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• pp.115-126
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• 1999

Past nears many Studies have been described for present state and forecasted for the future phenomena in various areas. Many theories and methodologies in transportation have been developed and applied by researchers and planners. On the other hand, many theories and methodologies had disappeared caused by their critical limitations. One of this cause that was discovered of the Chaos in traffic flows. The occurrence of Chaos in traffic flows has affected to the traffic volume and decreased significancy of a simulation result of a specific traffic flow. According to this fact, long-term forecast of traffic flow is difficult, moreover a butterfly effect impedes development and establishment of transportation model. A methodology to solve Chaos character in traffic flow can be able to provide more effective transport planning. This study tackles to enhance and revise the existing theories for the traffic flow applying Chaos theory to estimating travel time.

• Korean Journal of Cognitive Science
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• v.25 no.4
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• pp.277-302
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• 2014

This paper aims at providing a critical review of Alva Noe's enactive theory of perception. The discussion will be organized around the three issues: (i) Does the body make an ineliminable contribution to shaping the mind? (ii) Does Noe succeed in providing effective arguments against the brain-centrism? (iii) Does Noe's theory give a satisfactory explanation of how we can perceive external objects? In the sections 2 and 3 of the paper, I discuss possible criticisms that can be raised against Noe with regard to (i) and (ii). Although these are serious criticisms, they apply to the embodied cognition in general. That is, those criticisms are not restricted to Noe's theory. In order to understand the core aspect of Noe's theory, we need to pay attention to "the problem of perceptual presence" that is brought up in (iii). It is here that Noe's theory is supposed to make a distinct contribution to the discussion about the nature of perception. I argue, however, in the section 4 that Noe's theory fails to provide a satisfactory explanation of perceptual presence.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.8
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• pp.711-719
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• 2016

In this study, we derived an theoretical equation, using a simplified spring-mass model for the rolling stock, to obtain the overriding behavior of a leading vehicle, which is considered as the main factor in train accidents. To verify the derived equation, we created a simple 2D model based on the theoretical model, and a simple 3D model considering the characteristics of the power bogie. We then compared the theoretical results with the simulation results obtained using LS-DYNA. The maximum relative derivations in the vertical displacements at the first end-buffer, which is the most important point in overriding, were 3.5 [%] and 1.7 [%] between the two results. Further, we evaluated collision-induced overriding displacements using the theoretical equation for a rubber draft gear, a hydraulic buffer under various collision conditions. We have suggested a theoretical approach for the realization of overriding collision accidents or the energy absorption design of the front end of trains.

• Convergence Security Journal
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• v.22 no.4
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• pp.3-9
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• 2022

Recently, as the environment of the 4th industrial revolution has arrived, the opening, sharing and convergence of data are actively being achieved in any organization. However, the opening and sharing of data inevitably leads to security vulnerability and there is ambivalence that is a threat that can affect the existence of an organization operated in the 4th industrial revolution environment. Especially security issues in the organization of the military can be a threat to the state, not the military itself, so it is always necessary to maintain a high level of security discipline. In this paper, 14 variables were selected through structural equation model applying theory of planned behavior, deterrence and protection motivation to find out the security level development measures by extracting factors that can affect security level. As a result, the theory of planned behavior that the security knowledge embodied through the usual security regulation education and evaluation affects the behavior was adopted, and the theory of deterrence and protection motivation showed the significance of the rejection level. In addition, it was confirmed that the variables that have the greatest impact on the military security level through the measured values of the three-year security audit were commanders and mental security. In conclusion, in order to improve the security level, it is suggested that security education, definite reward and punishment, and security system upgrading should be firmly established and mental security posture should be secured.

• Journal of the Korean Institute of Intelligent Systems
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• v.14 no.3
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• pp.253-261
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• 2004

Game theory is mathematical analysis developed to study involved in making decisions. In 1928, Von Neumann proved that every two-person, zero-sum game with finitely many pure strategies for each player is deterministic. As well, in the early 50's, Nash presented another concept as the basis for a generalization of Von Neumann's theorem. Another central achievement of game theory is the introduction of evolutionary game theory, by which agents can play optimal strategies in the absence of rationality. Not the rationality but through the process of Darwinian selection, a population of agents can evolve to an Evolutionary Stable Strategy (ESS) introduced by Maynard Smith. Keeping pace with these game theoretical studies, the first computer simulation of co-evolution was tried out by Hillis in 1991. Moreover, Kauffman proposed NK model to analyze co-evolutionary dynamics between different species. He showed how co-evolutionary phenomenon reaches static states and that these states are Nash equilibrium or ESS introduced in game theory. Since the studies about co-evolutionary phenomenon were started, however many other researchers have developed co-evolutionary algorithms, in this paper we propose Game theory based Co-Evolutionary Algorithm (GCEA) and confirm that this algorithm can be a solution of evolutionary problems by searching the ESS.To evaluate newly designed GCEA approach, we solve several test Multi-objective Optimization Problems (MOPs). From the results of these evaluations, we confirm that evolutionary game can be embodied by co-evolutionary algorithm and analyze optimization performance of GCEA by comparing experimental results using GCEA with the results using other evolutionary optimization algorithms.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.2
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• pp.149-156
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• 2012

In fracture mechanics, the weight function can be used for calculating stress intensity factors. In this paper, a two-dimensional electroelastic analysis is performed on a transversely isotropic piezoelectric material with an open crack. A plane strain formulation of the piezoelectric problem is solved within the Leknitskii formalism. Weight function theory is extended to piezoelectric materials. The stress intensity factors and electric displacement intensity factor are calculated by the weight function theory.

• Journal of the Korean Society for information Management
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• v.20 no.1
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• pp.121-144
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• 2003

This thesis has a research focus in effectively Practicing cooperative instruction where teacher-librarians play a role. The cooperative Instruction means to practice cooperatively with the subject teachers and teacher-librarians, in teaching subject matters(Korean, English, Social studies. Science, History, and so forth), using the school library. This thesis presents three steps by theory-model-support for a practice method through developing a cooperative instruction model. This is based on curriculum which is an axis of school education and an instructional design theory which is a base theory for subject matters.