• 한국의류산업학회지
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• 제8권6호
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• pp.709-712
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• 2006

The aim of this study is to find out comfortable combinations of layered system for outdoor activities through water vapor permeability. Layering fabrics is an effective way of controlling water transport properties in fabric systems for outdoor activities and analysis of these systems may be useful for designing comfortable clothing. Seven fabrics were chosen for the experiments: two fabrics for base layer, two for the middle layer and three for the shell layer. A total of 12 different layered systems, which are all possible combinations were established using selected fabrics. The water vapor permeability was measured using JIS L1099 under isothermal and non-isothermal conditions. It was found that layered system was working together as a whole having influence on each layer, though every layer offers varying degree of water vapor permeability. Furthermore, it was also found that an optimal combination of the three layered system does exist although the combination may differ according to the ways. The shell layer is the greatest effect of water vapor permeability under isothermal and non-isothermal conditions within layered system.

• Steel and Composite Structures
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• 제31권6호
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• pp.641-653
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• 2019

In this paper, wave propagation is studied and analyzed in double-layered nanotubes systems via the nonlocal strain gradient theory. To the author's knowledge, the present paper is the first to investigate the wave propagation characteristics of double-layered porous nanotubes systems. It is generally considered that the material properties of nanotubes are related to the porosity and hygro-thermal effects. The governing equations of the double-layered nanotubes systems are derived by using the Hamilton principle. The dispersion relations and displacement fields of wave propagation in the double nanotubes systems which experience three different types of motion are obtained and discussed. The results show that the phase velocities of the double nanotubes systems depend on porosity, humidity change, temperature change, material composition, non-local parameter, strain gradient parameter, interlayer spring, and wave number.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제6권10호
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• pp.415-420
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• 2017

OS-level의 가상화 기술은 애플리케이션을 배포하기 위한 새로운 패러다임으로, 기존의 가상화 기술인 가상 머신을 대체할 수 있는 기술로서 주목받고 있다. 특히 컨테이너는 기존의 리눅스 컨테이너에 유니온 마운트 포인트(Union Mount Point) 와 레이어 구조의 이미지를 적용함으로써 보다 빠르고 효율적인 애플리케이션의 배포가 가능하다. 이러한 컨테이너의 특징들은 스냅숏 기능을 제공하는 레이어 구조의 파일 시스템에서만 사용될 수 있으며, 애플리케이션의 특징에 따라 적절한 레이어 파일 시스템을 선택하는 것이 요구된다. 따라서 본 논문에서는 대표적인 레이어 파일 시스템들의 특징을 조사한 뒤, 레이어 파일 시스템의 동작 원리인 Allocate-on-Demand 및 Copy-up 방식에 따른 파일 시스템의 쓰기 성능 평가를 수행한다. 또한 각 레이어 파일 시스템 방식의 블록 입출력 사용 데이터를 학습한 인공 신경망을 통해 임의의 애플리케이션에 대해 적합한 레이어 파일 시스템 방식을 결정하는 방법을 제시하고 이에 대한 타당성을 검토한다.

• 한국지능시스템학회:학술대회논문집
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• 한국지능시스템학회 2008년도 춘계학술대회 학술발표회 논문집
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• pp.54-55
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• 2008

본 논문에서는 인간형 로봇의 태스크 실행 중 자율 감정 생성을 위하여 Three-layered hybrid architecture에 기반한 감정 반응 시스템을 제안한다. Three-layered hybrid architecture는 Deliberative layer, Reactive layer Hardware abstraction layer의 3단계의 계층으로 되어 있으며, 모바일 로봇의 자율 동작을 위해서 개발되었다. 본 연구에서는 저자가 개발중인 안드로이드 EveR-2의 감정 시스템에 적용하여 로봇의 태스크 동작 중에 외부의 자극들로부터 자신의 감정을 생성하고, 생성된 감정과 태스크를 조합하여 자신의 행동을 변화시키며 인간과 상호작용하는 로봇 감정 시스템을 구현하였다.

• 한국세라믹학회지
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• 제48권5호
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• pp.396-403
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• 2011

In this study, we investigated the mechanical behaviors of layered thermal barrier coatings by indentations. Various single and double-layered thermal barrier coatings were deposited by air plasma spray process using different type of commercialized YSZ (Yttria stabilized zirconia) starting powders. Indentation stress-strain curve, load-displacement curve and hardness of the single and the double-layered thermal barrier coatings were obtained experimentally and analyzed. The indentation damages at the same loads were compared, and thus, the results depend on the structure of each coating. The result indicates improvement in damage resistances from tailoring of layered structures in the component of gas turbine system is expected.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.826-829
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• 1993

Existing fuzzy control methods do not perform well when applied to systems containing nonlinearities arising from unknown deadzones. We propose a novel two-layered fuzzy logic controller for controlling systems with deadzones. The two-layered control structure consists of a fuzzy logic-based pre-compensator followed by a conventional fuzzy logic controller. Our proposed controller exhibits superior transient and steady-state performance compared to conventional fuzzy controllers. We illustrate the effectiveness of our scheme using computer simulation examples.

• 한국위성정보통신학회논문지
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• 제6권2호
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• pp.66-71
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• 2011

본 논문에서는 통합이동위성시스템에서 계층적 부호화 방식의 성능과 효용성에 대한 평가 결과를 제시한다. 통합이동위성시스템의 주요 서비스는 멀티미디어 방송 및 멀티캐스팅 서비스가 될 것이다. 통합이동위성시스템에서, 위성과 보조지상장치는 고품질의 서비스를 제공하기 위하여 서로 협력적으로 동작하도록 되어 있다. 계층적 부호화 방식은 수신기에서 채널의 샅애에 적응할 수 있도록 하는 일종의 수신기에 의해 주도되는 적응형 방식이다. 본 논문에서는 터보부호화 방식을 이용한 계층적 부호화 방식을 소개하고 여러 가지 시나리오에서의 성능을 평가하며, 그 효용성에 대하여 논할 것이다. 본 논문에서 제시된 성능 평가 결과 및 분석 내용은 향후 효율적인 통합이동위성시스템을 설계하는데 활용될 수 있을 것이다.

• KIEAE Journal
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• 제7권5호
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• pp.87-92
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• 2007

As expansion of balconies at apartments has been legalized, the major function of the balconies as a thermal buffer zone is disappearing. This weakens the ability of window to insulate heat and multiplies surface condensation. Thus more and more residents require solutions to increasing surface condensation and aggravation in thermal comfort. This study intends to provide basic data by evaluating performance of triple layered Low-E windows, triple layered clear windows, double layered Low-E windows and double layered clear window used for expanded balconies and marketed within the country in terms of surface condensation and thermal environment through simulation. Results revealed that no surface condensation occurred at double layered Low-E windows and triple layered Low-E windows. Surface condensation took place at double layered clear windows and triple layered clear windows at a relative humidity of 60%. Thermal environment analysis suggested that double layered clear windows showed the most time falling into the range of comfort at $23^{\circ}C$. The figure were $22^{\circ}C$ for triple layered clear windows, $22^{\circ}C$ for double layered Low-E windows and $21^{\circ}C$ for triple layered Low-E windows.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1992년도 봄 학술발표회 논문집
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• pp.58-64
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• 1992

It is usual that underground structures are constructed within multi-layered medium. In this paper, an efficient numerical model ling of multi-layered structural systems is studied using coupled analysis of finite elements and boundary elements. The finite elements are applied to the area in which the material nonlinearity is dominated, and the boundary elements are applied to the far field area where the nonlinearity is relatively weak. In the boundary element model 1 ins of the multi-layered medium, fundamental solutions are restricted. Thus, methods which can utilize existing Kelvin and Melan solution are sought for the interior multi-layered domain problem and semi infinite domain problem. Interior domain problem which has piecewise homogeneous layers is analyzed using boundary elements with Kelvin solution; by discretizing each homogeneous subregion and applying compatibility and equilibrium conditions between interfaces. Semi-infinite domain problem is analyzed using boundary elements with Melan solution, by superposing unit stiffness matrices which are obtained for each layer by enemy method. Each methodology is verified by comparing its results which the results from the finite element analysis and it is concluded that coupled analysis using boundary elements and finite elements can be reasonable and efficient if the superposition technique is applied for the multi-layered semi-infinite domain problems.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 Proceedings of the Korea Automatic Control Conference, 11th (KACC); Pohang, Korea; 24-26 Oct. 1996
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• pp.358-361
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• 1996

In this paper, we discuss decentralized optimal fault tolerant supervisory control issues on the basis of failure analysis and diagnosis from the angle of discrete event dynamic system. We address the detectability and the observability problems, and develope fault tolerant supervisory control system upon the failure analysis and diagnosis schemes. A complete min-cut is introduced and the procedure for finding the achievable or nonachievable layered optimal legal sublanguages is suggested for a preferential option among the reachable states in the controlled plant. A layered optimal supervisory control framework is proposed upon these. We extend the concept of decentralized supervisory control by considering the problem of combination of decentralized with centralized control in case pure decentralized control happens to be inadequate. We introduce the concept of locally controllable pair and present a hybrid decentralized supervisory control framework. Finally, we propose the analytical framework for a decentralized optimal fault tolerant supervisory control systems.