• Ceramist
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• v.23 no.2
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• pp.132-144
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• 2020

Solid oxide fuel cell (SOFC) have attracted much attention due to clean, efficient and environmental-friendly generation of electricity for next-generation energy conversion devices. Recently, many studies have been reported on improving the performance of SOFC electrodes and electrolytes by applying atomic layer deposition (ALD) process, which has advantages of excellent film quality and conformality, and precise control of film thickness by utilizing its unique self-limiting surface reaction. ALD process with these advantages has been shown to provide functional ceramic interfaces for SOFC electrodes and electrolytes. In this article, recent examples of successful functionalization and stabilization on SOFC electrodes and electrolytes by the application of ALD process for realizing high performance SOFC cells are reported.

• IE interfaces
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• v.13 no.4
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• pp.751-758
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• 2000

Situation awareness is defined as a person's perception of the elements of the environment within a volume of time and space, the comprehension of their meaning and the projection of their status in the near future. Situation awareness is important in attempting to evaluate human behavior in operating complex systems such as aircraft, air traffic control, and nuclear power plant systems. From the literatures this study reviews the relationship between situation awareness and numerous individual, system and environmental factors, and also reviews the methodologies for the empirical measurement of situation awareness applicable to Korea Next Generation Reactor (KNGR) design project. Attention, working memory, workload, stress, system complexity, and automation are presented as critical factors limiting operator's situation awareness. Mental models and goal-directed behavior are hypothesized as important mechanisms overcoming these limits. This study summarized hypothesized guidelines for interface design to improve situation awareness of reactor operators. Some of the guidelines should be tested in the KNGR evaluation experiments in the future.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.17 no.6
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• pp.586-591
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• 2004

We studied the dependence of hot-tarrier-induced degradation characteristics on nitrogen concentration in NO(Nitrided-Oxide) gate of nMOS, under ac and dc stresses. The $\Delta$V$_{t}$ and $\Delta$G$_{m}$ dependence of nitrogen concentration were observed, We observed that device degradation was suppressed significantly when the nitrogen concentration in the gate was increased. Compared to $N_2$O oxynitride, NO oxynitride gate devices show a smaller sensitivity to ac stress frequency. Results suggest that the improved at-hot carrier immunity of the device with NO gate may be due to the significantly suppressed interface state generation and neutral trap generation during stress.ess.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2156-2159
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• 2001

발전소 보일러 제어시스템 관련 기술은 분산처리 소프트웨어 기술, 네트워크기술, MMI(Man Machine Interface) 기술, 실시간 처리기술, 데이터베이스 기술, 하드웨어 개발기술 등을 총 망라하는 복합기술로써, 선진국들이 기술이전을 기피하는 고급기술이다. 현재 국내에서 사용하고 있는 발전소 보일러 제어시스템은 전부가 Bailey, ABB, Siemens, Westinghouse 사 등의 외국설비로써 보일러 본체와 일괄계약형태로 제어시스템 전체가 외국회사의 설계에 의해서 도입 설치되어 운용되고 있다. 이러한 상황에서 국산 제어시스템의 개발기술 확보와 기술자립 차원에서 오래된 아날로그 제어시스템을 디지털 분산제어시스템으로의 개체작업에 국산 개발 제어시스템을 중용량 석탄화력발전소에 최초로 실용화 적용하고 그 적용사례를 본 논문에서 소개한다.

• Proceedings of the KIEE Conference
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• 2004.11b
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• pp.17-20
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• 2004

This paper presents a modeling and simulation of a grid-connected wind turbine generation system with respect to wind variations and three-phase fault in the system. It describes the modeling of the wind turbine system including the drive train model, induction generator model, and grid-interface model on MATLAB/Simulink. Case studies demonstrate that the pitch angle control is carried out to achieve maximum power extraction for wind speed variations and the duration of a fault on the system influences on the output of the wind turbine generator.

• Proceedings of the KIEE Conference
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• summer
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• pp.217-219
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• 2004

The installation of small sized dispersed generation(DG) units operating in parallel with the utility supply presents several technical problems for the protection and control of the system. One of the critical concerns is the occurrence of islanding. Hence, this paper propose the Digital Universal Relay(DUR) including anti-islanding function as DG interconnection interface. The existent islanding detection algorithms are examined. And the most effective and reliable method of those is modified for DUR application. The modified algorithm is evaluated through the modeling of the test system by PSCAD/EMTDC.

• Journal of the Optical Society of Korea
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• v.17 no.1
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• pp.10-15
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• 2013

Adsorption behavior of counterions under a Langmuir monolayer was investigated by sum-frequency generation (SFG) spectroscopy. By comparing SFG spectra of arachidic acid (AA) Langmuir monolayer/water interface with and without added salt, it was found that the simple trivalent cation $La^{3+}$ adsorbed on AA monolayer only when the carboxylic headgroups are charged (deprotonated), implying that counterion adsorption is induced by Coulomb interaction. On the other hand, metal hydroxide complex $Fe(OH)_3$ adsorbed even on a charge-neutral AA monolayer, indicating that the adsorption of iron hydroxide is due to chemical interaction such as covalent or hydrogen bonding to the headgroup of the molecules at the monolayer.

• 제어로봇시스템학회:학술대회논문집
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• 1997.10a
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• pp.69-72
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• 1997

A universal controller is designed using a DSP (digital signal processor). The design objectives of the system are to implement control algorithms that require a lot of calculations and to develop a convenient user-interface environment. To demonstrate the efficiency of the system, the time delay control algorithm is implemented for the 2 D.O.F.SCARA type robot and the experimental results are presented.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.520-522
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• 2002

SoC 설계의 검증 비용이 전체 설계 비용의 70%를 차지한다. 이런 검증을 위한 노력과 시간을 줄이기 위해서는 SoC 설계 검증 수준을 시그널 수준 또는 사이클 수준에서 트랜잭션 수준으로 높여야 할 필요성이 있으며, 또한 그렇게 하는 것이 바람직하다. 이 논문은 IP의 인터페이스를 통해 수행되는 트랜잭션을 사이란 수준에서 기술하는 트랜잭션 중심의 인터페이스 기술 언어로부터 트랜잭션 모니터 모듈을 생성하는 방법을 제시한다. 트랜잭션 모니터모듈은 시뮬레이션을 통한 검증에 파형을 통한 결과의 관찰대신, 트랜잭션 단위의 결과의 관찰을 가능하게 함으로써 검증시간을 줄이는데 공헌할 것으로 기대된다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.248-252
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• 2007

휴대폰이 디지털 컨버젼스 디바이스의 중심에 자리 잡음에 따라 휴대폰의 기능 복잡도에 대한 요구가 증가하였다. 이에 발맞추어 여러 기능에 대한 효율적인 접근을 도모하는 사용자의 휴대폰 사이의 인터페이스가 설계되어야 함에도 불구하고 현재의 휴대폰 인터페이스는 이에 부합하지 못한다. 따라서 본 논문에서는 효율적인 기능 접근성을 갖는 인터페이스 설계안을 제시하고자 한다. 이와 더불어 현재 시장에서 사용이 일반화되고 있는 터치스크린 장치에 적용하기에 효율적인 차세대 아이콘을 제안하고자 한다.