• Structural Engineering and Mechanics
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• 제85권3호
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• pp.305-314
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• 2023

The article is about the theoretical analysis of the transmission and reflection of elastic waves through the interface of perfectly connected materials. The solid continuum mediums considered are piezoelectric semiconductors and transversely isotropic in nature. The connection among the mediums is considered in such a way that it holds the continuity property of field variables at the interface. The concept of strain and stress introduced by non-local theory is also being involved to make the study more applicable It is found that, the incident wave results in the generation of four reflected and three transmitted waves including the thermal and elastic waves. The thermal waves generated in the medium are encountered by using the concept of three phase lag heat model along with fractional ordered time thermoelasticity. The results obtained are calculated graphically for a ZnO material with piezoelectric semiconductor properties for medium M₁ and CdSc material with transversely isotropic elastic properties for medium M₂. The influence of fractional order parameter, non-local parameter, and steady carrier density parameter on the amplitude ratios of reflected and refraction waves are studied graphically by MATLAB.

• 대한기계학회논문집
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• 제19권9호
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• pp.2249-2260
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• 1995

An experiment of close contact melting of phase-change medium partially filled in an isothermally heated horizontal cylinder is performed which involves the volume expansion of liquid induced by the solid-liquid density difference. The solid-liquid interface motion and the free surface behavior of liquid were reported photographically. The experimental results show that the curvature of upper solid-liquid interface varied to flat as melting progresses. In addition to the varying interface shape, the melting rate increases with the lower initial height of solid and the free surface height of liquid increases linearly. The experimental results of molten mass fraction were expressed in a function of dimensionless time Fo.Ste$^{3}$4/ and agreed well with the analytical solutions.

• 접착 및 계면
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• 제14권2호
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• pp.57-67
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• 2013

FTIR (Frustrated Total Internal Reflection) 터치스크린에서 아크릴 내의 전반사(TIR) 현상이 깨지는 원인을 조사하였다. 먼저 3층 박막(매질1 ($n_1$)-매질2 ($n_2$)-매질3 ($n_3$), $n_1=n_3{\neq}n_2$에서 굴절율의 상대적인 크기에 따라 매질1에서 FTIR 또는 매질1로부터 매질3으로 일반투과(Ordinary Transmission : OT) 현상이 나타남을 확인하고, 이들(FTIR과 OT)의 투과율 이론값은 인접한 두 반사광(또는 투과광)들의 위상차의 실수화 또는 허수화 과정을 통해 서로 전환됨을 이론적으로 유도하였다. 이와 병행하여 터치스크린에 손가락과 같은 외부 접촉에 의해 아크릴판(acrylate) 내에 형성된 전반사 조건이 깨지는 현상을 분석하였다. 이러한 분석과 실험을 토대로, 접촉 인식을 좋게 하기 위한 투명하고 굴절율이 아크릴과 유사한 젖음성 매체(wettable medium)를 적용한 FTIR 터치스크린 구조를 제안하였다.

• 한국광학회:학술대회논문집
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• 한국광학회 2009년도 동계학술발표회 논문집
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• pp.233-234
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• 2009

The theoretical study of a surface-plasmon wave at a planar metal-chiral interface is presented in this communication. It is found that a surface-plasmon wave can be excited at the planar interface of a thin metal film and a structurally dielectric chiral medium, if the exciting plane wave is P-polarized.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.390-395
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• 1988

The implementation of MAP(Manufacturing Automation Protocol) NIU(network interface uint) is studied and presented in this paper. Hardwares and system softwares for network management, user interface, and medium access control are developed. Also LLC(Logical Link Control) protocol is implemented. Afterwards, The operations of NIU using self-test functions are tested. Compatibility between interfaces according to IEEE 802.4 standard is also tested.

• 한국전자현미경학회:학술대회논문집
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• 한국현미경학회 1995년도 제26차 추계학술대회
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• pp.7-7
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• 1995

• Nuclear Engineering and Technology
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• 제52권1호
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• pp.78-86
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• 2020

The operation and monitoring (OM) interface is the digital medium between nuclear power system and operators. The cognitive load of OM interface has an important effect on the operation errors made by operator during OM task between operator and computer. The cognitive load model of OM interface is constructed for analysing the composition and influencing factors of OM interface cognitive load. And to study the coping strategies and methods for cognitive load of nuclear power system. An experiment method based on eye movement is proposed to measure the cognitive load of OM interface. Experiment case is carried out with 20 subjects and typical OM interface of a nuclear power system simulator. The OM interface is optimized based on the experiment results. And the results comparison between the original OM interface and the optimized OM interface shows that the cognitive load model and proposed method is valuable contributions in reducing the cognitive load and improving the interaction efficiency of OM tasks.

• Geomechanics and Engineering
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• 제7권5호
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• pp.495-524
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• 2014

To investigate the soil-pile interactive performance under lateral loads, a set of laboratory model tests was conducted on remoulded test bed of soft clay and medium dense sand. Then, a simplified boundary element analysis had been carried out assuming floating pile. In case of soft clay, it has been observed that lateral loads on piles can initiate the formation of a gap, soil heave and the tension crack in the vicinity of the soil surface and the interface, whereas in medium dense sand, a semi-elliptical depression zone can develop. Comparison of test and boundary element results indicates the accuracy of the solution developed. However, in the boundary element analysis, the possible shear stresses likely to be developed at the interface are ignored in order to simplify the existing complex equations. Moreover, it is unable to capture the influence of base restraint in case of a socketed pile. To bridge up this gap and to study the influence of the initial stress state and interface parameters, a field based case-study of laterally-loaded pile in layered soil with socketed tip is explored and modelled using the finite element method. The results of the model have been verified against known field measurements from a case-study. Parametric studies have been conducted to investigate the influence of the coefficient of lateral earth pressure and the interface strength reduction factor on the results of the model.

• 디자인학연구
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• 제19권2호
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• pp.183-194
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• 2006

본 논문은 인식론적인 측면에서 디지털 인터페이스의 새로운 가능성을 확인하는데 그 목적이 있다. 우선 디지털 인터페이스의 역사를 개관함으로써 현재의 인터페이스가 우연적 계기들의 산물임을 밝히고 있다. 그것이 필연적인 결과가 아니라는 사실은 새로운 디지털 인터페이스가 무한히 존재할 수 있음을 암묵적으로 증언한다. 현실의 제한된 인터페이스는 디지털 기술과 디지털 미디어에 대한 제한적 이해로부터 파생하였다. '블랙박스'라는 은유를 통한 이해가 바로 그것이다. 본 논문은 디지털을 일종의 빛으로 보는 사유를 통해 이러한 이해를 극복하고 있다. 빛으로서의 디지털과 디지털 미디어라는 새로운 인식론은 인터페이스 디자인 활동이 차이를 긍정하고 생성하는 창조적 활동으로 나아가야 한다는 윤리학으로 발전한다.

• Journal of Communications and Networks
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• 제1권3호
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• pp.201-212
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• 1999

This paper studies the rapid design and implementation of the medium access control(MAC) and related interface circuits for 802.11 wireless LANs based on the field programmed gate ar-ray(FPGA) technology. Our design is thus aimed to support both the distributed coordination function (DCF) and the point coordination function(PCF) with the aid of FPGA technology. Further-more, in an infrastructure network, some stations may serve as the access points (APs) which may function like a learning bridge. This paper will also discuss how to design for such application. The hardware of the MAC and interface may at least consist of three major parts: wireless transmission and reception processes and in-terface, host(bus) interface, and the interface to the distributed system (optional). Through the increasing popularity of FPGA de-sign, this paper presents how Complex Programmable Logic De-vices(CPLD) can be utilized for speedy design of prototypes. It also demonstrates that there is much room for low-cost hardware prototype design to accelerate the processing speed of the MAC control function and for field testing.