• 공학교육연구
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• 제3권2호
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• pp.38-43
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• 2000

인터넷을 통한 WWW(World-Wide Web)는 사이버 교육을 위해 새로운 기회를 제공한다. 웹은 다른 네트워크 툴과 조합되어 학습자에게 유용한 교육적 정보를 제공한다. 본 논문에서는 인터넷상에서 전자회로 원리 이해용 애플릿을 개발하여 몇 가지 예제 애플릿을 제시하였다. 이 논문에서 제시된 방식을 가상대학 교육에 적극 활용한다면 가상대학 강좌의 효율성을 크게 증진시킬 수 있으리라 생각된다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제14권6호
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• pp.789-796
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• 2014

A CMOS photo detection bias quenching circuit is developed to be used with single photon avalanche photodiodes (SPADs) operating in Geiger mode for the detection of weak optical signals. The proposed bias quenching circuits for the performance improvement reduce the circuit size as well as improve the performance of the quenching operation. They are fabricated in a $0.18-{\mu}m$ standard CMOS technology to verify the effectiveness of this technique with the chip area of only $300{\mu}m^2$, which is about 60 % of the previous reported circuit. Two types of proposed circuits with resistive and capacitive load demonstrated improved performance of reduced quenching time. With a commercial APD by HAMAMATSU, the dead time can be adjusted as small as 50 ns.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.351-354
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• 2000

In the past, we proposed an IDDQ testable design method for static CMOS PLA circuits. All bridging faults can be detected in NOR planes of our testable designed PLA circuits by IDDQ testing with 4 kinds of test input vectors which are independent of the logical functions to be realized. However, the testable designed PLA circuits consume large power in the normal operation. In this paper, a new IDDQ testable design method is proposed and evaluated by some experiments. The experimental results show that the PLA circuit designed with our method can work with low power consumption than the previous one.

• 한국전기전자재료학회논문지
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• 제26권7호
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• pp.515-521
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• 2013

Magnetoelectric(ME) bulk composites with PZT-PNN-PZN/$Fe_2O_4$ were prepared by using a conventional ceramic methods and investigated on the ME voltage vs frequency of ac magnetic fields. We made the electric equivalent circuits by using the Maxwell-Wagner model and simulated the frequency dependence of ME voltage in low frequency region. ME devices were described by a series of two equivalent circuits of piezoelectric and magnetic, which have the relaxation time ${\tau}$ due to the interaction between ME device and load resistor. Equivalent circuit of piezoelectric material is independent of frequency. However ferrite magnetic materials have Debye absorption and dipolar dispersion, whose equivalent circuit is a function of frequency. Therefore we suggest the resistance in the equivalent circuit is proportion to $1+{\omega}^2{\tau}^2$ and the capacitance is in inverse proportion to $1+{\omega}^2{\tau}^2$ in the magnetic materials.

• 센서학회지
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• 제5권5호
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• pp.63-68
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• 1996

출력신호를 검출하기 위한 집적화한 용량형 압력센서를 구현하기 위해서는 센서의 특성에 나쁜 영향을 미치는 기생용량, 온도/열 드리프트 및 누설전류 등의 요소가 개선 되어야 한다. 본 논문에서는 2개의 용량-주파수 변환기와 4비트 디지탈 보상회로로 구성된 새로운 이상적인 인터페이스 회로를 설계 하였다. 이 회로는 센싱 센서 주파수를 기준 센서 주파수로 나누어줌으로써 드리프트 및 누설전류의 영향이 제거될 수 있도록 설계 되었고, 신호 전송시 잡음의 영향이 적은 디지탈 신호를 처리하도록 되어있다. 그르므로 이 회로는 디지탈 비트수를 늘려 줌으로 출력신호의 분해능을 향상 시킬 수 있다. 또 이 회로 중 디지털 부분은 FPGA 칩으로 제작되어 그 작동이 확인 되었다.

• Journal of Information Display
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• 제11권4호
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• pp.173-181
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• 2010

In this paper, light-emitting-diode (LED) backlight driving circuits and dimming method for medium-sized and large liquid crystal displays (LCDs) are proposed. The double loop control method, the intelligent-phase-shifted PWM dimming method, the fast-switching current regulator, and the current matching techniques are proposed to improve not only the current regulation characteristics and the power efficiency but also the current matching characteristics and the transient response of the LED current. The brightness of the backlight using the proposed local dimming method was determined from the histogram of the local block to reduce the power consumption of the backlight without image distortion. The measured maximum power efficiency of the LED backlight driving circuit for medium-sized LCDs was 90%, and the simulation results showed an 88% maximum power efficiency of the LED backlight driving circuit for large LCDs. The maximum backlight power-saving ratio of the proposed dimming method was 41.7% in the simulation with a high-contrast image. The experiment and simulation results showed that the performance of LEDs as LCD backlight units (BLUs) improved with the proposed circuits and method.

• 한국산업융합학회 논문집
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• 제26권1호
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• pp.105-112
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• 2023

We analyze the global market for flexible electronic circuits, technical considerations, and analyze the market for application areas and regions. In the market analysis of the application field, the display field has the greatest influence in terms of market size and annual growth rate, and the OLE D lighting market size is expected to grow by nearly 50% in 2026. The multilayer flexible electronics, which dependently requires the semiconductor technology, has a larger market size than other structures and its growth rate is relatively large, leading the market and will be further analyzed in depth. The market size of multilayer flexible electronics applied to display field is expected to show an annual growth rate of 21.1% from $2.7 billion in 2017 to $9.8 billion in 2026, and the OLED market is expected to grow by 75.2% during the same periods. Recently, as electronic products have been miniaturized and advanced, and robust installation in a small space is required, companies that preoccupy multilayer structure or rigid flexible electronic circuit technology have an advantage in competitiveness, so many companies are trying to obtain this technology. These efforts are systematically supported by many countries because they can achieve mutual growth by strengthening the competitiveness of the application field and the same industry. In the case of Korea, a support system is established, but it is required to expand and activate it, and to localize manufacturing equipment and materials.

• 한국산업정보학회논문지
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• 제17권3호
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• pp.27-34
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• 2012

This paper presents the impact of time dependent dielectric breakdown (TDDB, also called as gate oxide breakdown) failure on nanoscale digital CMOS Circuits. Recently, TDDB for ultra-thin gate oxides has been considered as one of the critical reliability issues which can lead to performance degradation or logic failures in nanoscale CMOS devices. Also, leakage power in the standby mode can be increased significantly. In this paper, TDDB aging effects on large CMOS digital circuits in the 45nm technology are analyzed. Simulation results show that TDDB effect on MOSFET circuits can result in more significant increase of power consumption compared to delay increase.

• 전자공학회논문지C
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• 제35C권7호
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• pp.46-58
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• 1998

In this paper, we propose a synthesis algorithm for the design of low powe rcombinational circuits under area constraints. The proposed algorithm partitions a given circuit into several subcircuits such that only a selected subcircuit is activated at a time, hence reduce unnecessary signal transitions. Partitioning of a given circuit is performed through adaptive simulated annealing algorithm employing the cost function reflecting poer consumption under area constraints. Experimental reuslts for the MCNC benchmark circuits show that the proposed algorithm generates the circuits which consume less power by 61.1% and 51.1%, when compared to those generated by the sis 1.2 and the precomputation algorithm, respectively.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 제4회 영호남학술대회 논문집
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• pp.19-24
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• 2002

Static electricity is an everyday phenomenon. There can be few of us who have not experienced a static shock after sliding across a car seat. Other static nuisance effects include the cling of some fabrics to the body, the sticking of a plastic document cover, or the attraction of dust to a TV or computer screen. However, static electricity has been a serious industrial problem. The age of electronics brought with it new problems associated with static electricity and electrostatic discharge. And, as electronic devices became faster and smaller, their sensitivity to ESD increased. In this work, We are study on the control technique of electo-static discharges using semiconductor circuits. Our circuits are prevented well to electrostatic shock or damages from triboelectric charging in cars everyday life.