• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.971-974
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• 2005

In this paper, we describe photonic sensor interface in SOPC(System on a programmable chip) platform. This platform uses device that has ARM922T processor and APEX FPGA area on a chip. We use two development kits. The one is embedded kit that using Intel's Xscale device, the another is SOPC kit that using Altera's Excalibur device. We implement some device logic that DMAC, ADCC, etc. and application.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.751-754
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• 1998

This research aims at developing a single chip multiprocessor for high-performance computer system. Our design approach is to design a relatively small and simple processor unit and to integrate multiple copies of the unit in an efficient way. The proposed multiprocessor is composed of four CPUs and one graphic coprocessor. The four CPUs share the graphic coprocessor and each CPU implements the 64-bit SPARC-V9 instruction set architecture. This paper gives an overview of the proposed microarchitecture and discusses the considerations made in the course of the design.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1993.05a
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• pp.11-11
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• 1993

농업 생산시설의 환경제어장치를 one chip microcomputer를 사용하여 설계, 제작하였으며 실시간 복합 제어 기능을 수행할 수 있는 운영 프로그램을 개발하였다. 제어 장치의 microcomputer 는 6 개의 analog input 선을 포함하여 45 개의 입.출력선을 가진 8 bit microcomputer chip을 사용하였다. 농업환경인 온도, 습도, 조도는 센서를 직접 접속하여 계측 할 수 있도록 계측 module을 포함시켰다. (중략)

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.782-785
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• 2002

Power amplifier of wireless communication tranceiver can be effectually controlled output power. And small size and low power dissipation are indispensable to portable system. In this paper, to reduce the size of portable tranceiver, inductor is integrated in a single chip. And to reduce power dissipation, a power amplifier that can be digitally controlled output power, is proposed and designed.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.963-968
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• 2002

This paper will review the driving methods and issues of driving circuitry for passive matrix organic electro-luminescent displays(PM-OELDs). And it will shows the proposed one-chip and two-chip solution for driving the PM-OELDs and also the pixel structure and driving methods of active matrix (AM-OELDs). We will discuss the proper applications of OELDs with its power consumption by comparison with that of LCD.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1993.06a
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• pp.1386-1389
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• 1993

We are describing the architecture of a fuzzy logic controller using pulse-width-modulation (PDM) technique and a pipeline structure. Features of this controller are: A new architecture for the inference unit, reduced chip area and less I/O-pins. Additionally we present two different rule-bases: one hardwired with reduced chip-area and the other programmable for prototyping. Also an architecture of a parallel minimum-gate is shown.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.35D no.9
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• pp.77-86
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• 1998

A two-chip humidity sensor system has been developed which consists of a capacitive sense element die and a CMOS interface chip. The sense element was fabricated using thin polyimide films on (100) silicon substrate and showed excellent linearity(0.72%FS), low hysteresis (<3%) and low temperature coefficient(-0.0285 ~-0.0542pF/K) over a wide range of relative humidity and temperature. The capacitance-relative humidity characteristic exhibited a drift of 2~3% after 9 weeks of exposure to 4$0^{\circ}C$/90%RH. The signal-conditioning circuitry was fabricated using an 1.2- ${\mu}{\textrm}{m}$, one poly double metal CMOS process. The measured output voltage of the sensor system was directly proportional to relative humidity and showed good agreement with theory.

• Journal of the Korean Society for Precision Engineering
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• v.22 no.4
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• pp.76-83
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• 2005

With the acceleration of the miniaturization of products, especially in recent years, machining technologies for these products is in need of improvement. Conventional technologies have limitations in realizing the miniaturization due to the downsizing effects of the tools, which lack sufficient cutting stiffness during machining. The application of ultrasonic vibration is one of the most useful solutions in dealing with the problem. This study focused on the difference of ultrasonic drilling from conventional one in geometrical machining mechanism and the corresponding machining results. In detailed, some mathematical equations for drill cutting edge paths during drilling were extracted and new method to find uncut chip thickness from above equations was suggested. The experiments were carried out through the comparison between the results (disposed chips and internal surface states of holes) of conventional drilling and those of ultrasonic drilling. It was determined that the geometrical paths of cutting edges and analyzed uncut chip thickness agree with the appearance of disposed chips. Furthermore, the change in tool path by ultrasonic vibration resulted in the improvement of surface statement.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.6
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• pp.42-48
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• 2010

Joint Tactical Information Distribution System (JTIDS) uses cyclic code shift keying (CCSK) for baseband symbol modulation, in which 5-bit information is mapped to one of thirty two 32-chip sequences. It is a kind of direct sequence based spread spectrum communication. In this paper, the performance of non-coherent detection of CCSK using non-orthogonal 32-chip sequence is evaluated. And a 32-chip sequence with better performance is also proposed and compared with the conventional one.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.6
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• pp.539-546
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• 2006

The Air Quality Sensor(AQS), located near the fresh air inlet, serves to reduce the amount of pollution entering the vehicle cabin through the HVAC(heating, ventilating, and air conditioning) system by sending a signal to close the fresh air inlet door/ventilation flap when the vehicle enters a high pollution area. The sensor module which includes two independent sensing elements for responding to diesel and gasoline exhaust gases, and temperature sensor and humidity sensor was designed for intelligent AQS in automobile. With this sensor module, AVR microcontroller was designed with back propagation neural network to a powerful gas/vapor pattern recognition when the motor vehicles pass a pollution area. Momentum back propagation algorithm was used in this study instead of normal backpropagation to reduce the teaming time of neural network. The signal from neural network was modified to control the inlet of automobile and display the result or alarm the situation in this study. One chip microcontroller, ATmega 128L(ATmega Ltd., USA) was used for the control and display. And our developed system can intelligently reduce the malfunction of AQS from the dampness of air or dense fog with the backpropagation neural network and the input sensor module with four sensing elements such as reducing gas sensing element, oxidizing gas sensing element, temperature sensing element and humidity sensing element.