• Journal of Technology Innovation
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• v.22 no.3
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• pp.193-223
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• 2014

Socio-technical systems are receiving growing attention as a core concept in the process of searching for proper solutions to sustainable growth. In this paper, we review the way for governing socio-technical transitions from a governmental perspective. Based upon the governance studies and transition research, we set social coordination and locus of transition pressures as transition contexts to differentiate transition policy governance. We propose four types of policy governance for sustainable socio-technical transitions: leading, facilitative, coordinative and persuasive. Analysis on four case based upon this typology shows different transition polices of each transition pathway in analytical aspect. It provides basic criteria for policy makers to design effective transition policies in normative aspect. Also, this paper can contribute to closing the gap between transition research and governance studies.

• The Journal of the Acoustical Society of Korea
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• v.28 no.3
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• pp.174-186
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• 2009

When we apply a propagation model to the ocean with boundaries, we can calculate reflected wave using reflection coefficient suggested by Rayleigh assuming the boundaries are flat. But boundaries in ocean such as sea surface and sea bottom have an irregular rough surface. To calculate the reflection loss for an irregular boundary, it is needed to compute the coherent reflection coefficient based on an experimental formula or scattering theory. In this article, we derive the coherent reflection coefficients for a fluid-fluid interface using perturbation theory, Kirchhoff approximation and small-slope approximation respectively. Based on each formula, we can calculate coherent reflection coefficients for a rough sea surface or sea bottom, and then compare them to the Rayleigh reflection coefficient to analyze the reflection loss for a random rough surface. In general, the coherent reflection coefficient based on small-slope approximation has a wide valid region. Comparing it with the coherent reflection coefficients derived from the Kirchhoff approximation and perturbation theory, we discuss a valid region of them.

• ICROS
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• v.1 no.2
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• pp.14-20
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• 1995

이 글에서는 제어시스템의 구현 동향을 간단히 정리하였다. 특히 국내에서 최근 많은 관심을 끌고 있는 분야들 중에서 발전산업에 관련된 보일러-터빈-발전기의 핵심기기 제어장치와 흡인식 자기부상 열차의 부상제어기에 관하여 서술하였다. 제어이론의 측면보다는 산업현장에서 요구되거나 시스템 통합차원에서 요구되는 사항들을 중심으로 기술하였으며 각각의 분야에 대한 보다 전문적인 접근을 다음으로 미룬다.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.361-364
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• 2000

의사결정시스템을 웹 상에서 구현하기 위한 시스템의 설계요건, 시스템 구성, 처리과정에 대해 기술하였다. 각 선택 대상에 따라 각 선택요소의 확률을 기반으로 하여 사용자로부터 받은 데이터를 처리하는 시스템을 구현하였다. 각 선택대상간 의사결정값의 차이변수, 판별변수를 정의하였고, 이론 기초로 의사결정 메시지를 출력한 수 있는 알고리즘을 제안한다.

• 전기의세계
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• v.32 no.2
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• pp.93-102
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• 1983

대규모 시스템의 해석 및 제어기설계에 관한 연구개요 및 동향을 시스템단순화 안정도검사, 비집중제어 및 계층적최적제어로 구분하여 기술하였는바, 대규모시스템 이론은 해석이나 혹은 설계에 있어서 문제를 여러개의 부문제들로 분해하는데에 그기초를 두고 있으며, 소규모시스템에 적용되던 수학적기법을 부문제들에 적용시키는데에 국한되고 있다고 사료된다.

• Journal of Advanced Navigation Technology
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• v.13 no.2
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• pp.201-207
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• 2009

Recently effective spectrum resource technologies have been studied using a game theorectical approach for cognitive radio networks. Radio resource management is required an effective scheme because the performance of a radio communication system much depends on it's effectiveness. In this paper, we suggest a game theoretical algorithm for adaptive power control which is required an effect scheme in cognitive radio networks. It will be a distributed network. In the network distributed cognitive radio secondary users require an adaptive power control. There are many results which are suggested some possibility of game theoretical approaches for communication resource sharing. However, we suggest a practical game algorithm to achieve Nash equilibrium of all secondary users using a Nash equilibrium theorem in this paper. Particularly, a game model was analyzed for adaptive power control of a cognitive radio network, which is involved in DSSS (Direct Sequence Spread Spectrum) techniques. In case of K=63 and N=12 in the DSSS network, the number of iteration was less than maximum 200 using the suggested algorithm.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.2C
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• pp.133-141
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• 2008

Theoretical analysis are developed to estimate the load transfer by soil arching in geosynthetic-reinforced and pile-supported(GRPS) embankment systems. According to the results of analyses, the efficiency of embankment pile systems increases when the geosynthetics are installed with piles. Especially the increment of efficiency is more remarkable in the low embankment height, where soil arching can not be fully developed. The factors affecting the load transfer in GRPS embankment systems are the pile spacing, the height and properties of embankments, and the strength of geosynthetics. The efficiency decreases with increasing the pile spacing, while it increases with the height and internal friction angle of embankment fills, and the strength of geosynthetics. These results of analyses show the proposed analysis method is resonable to estimate the soil arching in GRPS embankment systems.

• Journal of Aerospace System Engineering
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• v.18 no.2
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• pp.12-20
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• 2024

The application of reinforcement design to ensure the structural safety of electronics in small satellites is limited by the spatial constraints of the satellite structure during launch vibrations. Additionally, a reliable evaluation approach is needed for mounting highly integrated devices that are susceptible to fatigue failure. Although the Steinberg fatigue failure theory has been used to assess the structural integrity of electronic devices, recent studies have highlighted its theoretical limitations. In this paper, we propose a structural methodology based on the critical strain theory to design the digital control unit (DCU) of the X-band SAR payload component for the small SAR technology experimental project (S-STEP), a small satellite constellation. To validate the design, we conducted modal and random analyses using simplified modeling techniques. Based on our methodology, we ultimately demonstrated the structural safety of the electronics through analysis results, safety margin derivation, and functional tests conducted both before and after the launch test.

• The Journal of the Acoustical Society of Korea
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• v.17 no.1
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• pp.31-38
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• 1998

본 논문에서는 애매성을 고려한 이론을 적용하여 유사도를 측정한 후 퍼지 관계 행 렬을 생성하여 인식을 행하는 방법을 제안하고자 한다. 인식 시스템은 모델과 입력 영상의 특징값을 정합하여 행하게 되는데 이때 얼마나 유사한가를 계산하는 유사도 측정은 대단히 중요한 작업중의 하나가 된다. 이를 위해 톨이론과 퍼지이론의 일치도 연산을 이용하여 유 사도를 측정하며, 퍼지 관계 행렬을 생성하여 정합을 행하고자 한다. 제안한 알고리즘에 대 해 3차원 물체와 얼굴 영상을 대상으로 실험을 수행하였으며 이를 통해 본 논문의 유용성을 입증하고자 한다.

• Proceedings of the Korean Fiber Society Conference
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• 1998.10a
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• pp.360-364
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• 1998

지금까지, 천의 주관적인 태평가는 역학적인 특성에 의하여 결정된다고 연구되고 있다. 특히 KES-FB 시스템은 천의 역학적인 특성을 통계학적인 방법으로 객관화한 소프트웨어이다[1], 대체적으로 직물에 비해 편성물은 측정의 어려옴, 지역적인 기후특성, 문화적인 차이 때문에 태를 평가하는데 적용하기 난해한 면이 있다[2]. 종합적인 태는 천의 사용 용도와 사람의 정신적인 특성에 대한 반영이 개입되어야 하므로 적용하기에 곤란하지만, 최근에 응용되고 있는 퍼지이론과 신경망이론을 통하여 전체적인 태평가가 가능하리라 본다. (중략)