• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.8
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• pp.954-963
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• 2007

As RFID systems are applied to various fields and applications such as supply chain management, asset management, location based applications etc. the requirements becomes diverse. For example, Much higher performance, TCP/IP protocol stack are required in some applications. However, low end processors based systems such as 8051 processor can not meet such requirements due to their low processing capacity and limited size of memory. In this paper a UHF band RFID system which meets the EPC Class-1 Generation-2 specification with ARM920T-based processor is implemented and tested.

• Journal of Electrical Engineering and Technology
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• v.11 no.5
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• pp.1253-1264
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• 2016

• Proceedings of the Korean Magnestics Society Conference
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• 2003.12a
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• pp.60-60
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• 2003

• Proceedings of the KIEE Conference
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• 1987.07a
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• pp.45-46
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• 1987

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.5B no.3
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• pp.229-232
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• 2005

Finite element method (FEM) is a very powerful tool for the calculation of magnetic field of electromagnetic devices. MATLAB/Simulink is also well known as a very useful tool for control systems. This paper proposes a very promising method, where the FEM is coupled with MATLAB. We apply this method to analyze a permanent magnet (PM) motor drive system, and compare with results using MATLAB only.

• The Journal of the Acoustical Society of Korea
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• v.18 no.3E
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• pp.44-48
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• 1999

The CMOS four-quadrant analog multiplier for low-voltage low-power applications are presented in this thesis. The circuit approach is based on the characteristic of the LV (Low-Voltage) composite transistor which is one of the useful analog building block. SPICE simulations are carried out to examine the performances of the designed multiplier. Simulation results are obtained by 0.6㎛ CMOS parameters with 2V power supply. The basic configuration of the multiplier is the CMOS Gilbert cell with two LV composite transistors. The linear input range of the multiplier is over ±0.4V with a linearity error of less than 1.3%. The measured -3dB bandwidth is 288MHz and the power dissipation is 255 ㎼.

• JSTS:Journal of Semiconductor Technology and Science
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• v.9 no.4
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• pp.249-256
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• 2009

As a wireless handset deals with multiple application standards concurrently, RF transmitters and power amplifiers are required to be more power efficient and reconfigurable. In this paper, we review the recent advances in the design of the power amplifiers and transmitters. Then, the systematic design approaches to improve the performance with the digital baseband signal processing are introduced for the next generation mobile handset.

• JSTS:Journal of Semiconductor Technology and Science
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• v.17 no.2
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• pp.204-209
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• 2017

We have investigated a Mo/Au gate scheme for use in AlGaN/GaN-on-Si HFETs. AlGaN/GaN-on-Si HFETs were fabricated with Ni/Au or Mo/Au gates and their electrical characteristics were compared after thermal stress tests. While insignificant difference was observed in DC characteristics, the Mo/Au gate device exhibited lower on-resistance with superior pulsed characteristics in comparison with the Ni/Au gate device.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.481-485
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• 2006

분산 컴퓨팅 시스템에 관한 연구가 네트워크가 발달함에 따라 점차 다양한 분야에서 활발하게 이루어지고 있다. 하나의 컴퓨터의 성능으로는 처리하기 힘든 일을 여러 컴퓨터 시스템이 분산하여 처리함으로써 효율성을 극대화 시킬 수 있도록 하는 이 기술은 네트워크가 발달할 수록 점점 더 각광 받을 것이다. 본 논문에서는 분산 컴퓨팅 시스템에서 무결성, 기밀성을 보장하기 위해 인증 시스템을 이용한 보안 프로토콜을 제시한다.

• Proceedings of the KIPE Conference
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• 2017.11a
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• pp.87-88
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• 2017

본 논문에서는 새로운 태양광 추적 시스템을 제안한다. 일반적으로 기존 감지식 태양광 추적 시스템은 광 센서를 이용하여 태양위치를 추적하는 방식으로 이루어 진다. 제안하는 시스템은 광 센서를 제거한 후 여러 개의 태양광 패널 각각 발전량을 비교하여 태양위치를 추적한다. 이러한 방법은 기존 태양광 추적 시스템의 많은 단점을 보완할 수 있다. 제안된 방법은 프로토 타입을 통해 검증하였다.