• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.04b
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• pp.10-11
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• 2008

We developed the equipment palpating cell proliferation using a high brightness LED. This equipment was fabricated using a micro-controller and a high brightness LED, and designed to enable us to control light irradiation time, intensity, frequency and so on. Especially, to control the light irradiation frequency, FPGA was used, and to control the change of output value, TLC5941 was used. Control stage is divided into 30 levels by program. Consequently, the current value could be controlled by the change of level in Continue Wave(CW) and Pulse Width Modulation(PWM), and the output of a high brightness LED could be controlled stage by stage. And then, each experiment was performed to irradiation group and non-irradiation group for bone marrow cells. MIT assay method was chosen to verify the cell increase of two groups and the effect of irradiation on cell proliferation was examined by measuring 590nm transmittance of ELISA reader. As a result, the cell increase of bone marrow cells was verified in irradiation group as compared to non-irradiation group.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.01a
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• pp.143-144
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• 2014

본 논문에서는 뇌졸중 환자의 독립적인 재활운동이 가능할 수 있는 시스템을 제안한다. 뇌졸중은 뇌기능의 부분적 또는 전체적으로 급속히 발생한 장애가 상당 기간 이상 지속되는 상태를 의미한다. 이러한 뇌졸중은 상지 운동을 통해 대뇌 운동피질을 활성화하여 재활 할 수 있어, 의학 분야에서는 운동기구를 이용하여 뇌졸중 환자의 재활을 돕고 있다. 하지만 병원이 아닌 가정에서 운동을 하기에는 운동기구에 비용, 작업치료사의 부재와 같은 환경적인 측면으로 무리가 있다. 따라서 본 논문에서는 가정에서 환자가 독립적인 운동을 할 수 있게 MCU와 Android Application을 이용하여 의료진이 환자의 옆에 없더라도 운동이 가능하고 가이드를 제공하는 스마트한 재활운동기기를 개발하였다. 또한 기존의 재활운동기기는 단순히 운동만 할 수 있었다면, 본 연구에서는 Android Application에서 게임을 제공함으로써 보다 즐겁게 운동이 가능하여 재활의지 증가를 기대해볼 수 있다. 뿐만 아니라 환자의 운동 데이터가 실시간으로 저장되어 병원에서 의료진이 환자의 운동 상태를 파악할 수 있도록 구성함으로 써 향후 뇌졸중 환자의 재활연구분야에 도움이 될 것이라 생각한다.

• Proceedings of the IEEK Conference
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• 2001.06e
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• pp.69-72
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• 2001

In this paper, we study about a acupuncture point and a non-acupuncture point resistance characteristics for acupuncture research. For this study, we devised resistance variation measurement system. This system is consist of 4-channel skin resistance measuring parts, filters, 12bit A/D convertor, 8051 micro-controller, and personal computer The developed system insert a low current to skin and obtains voltages from standard resistor that is convected to measurement circuit in series. The obtained voltage is converted to 12bit digital signal. Therefore the converted signal is changed to skin resistance by calculation in the personal computer. As the results of experiment, the resistance of acupuncture point and non-acupuncture point are different from each other. The acupuncture point has very fast current flows than the other non- acupuncture point.

• Journal of the Korean Magnetics Society
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• v.22 no.2
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• pp.45-48
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• 2012

Feed-back type 3-axis flux-gate magnetometer using Co-based amorphous ribbon (Metglass$^{(R)}$2714A) was constructed in this work. Measuring range of magnetic field and frequency were ${\pm}100\;{\mu}T$ and dc~10 Hz respectively. For the interface to computer, microcontroller and 24 bit ADC (Analog to Digital Converter) were employed and resolution of digital output was 0.1 nT. Magnetometer noise of analog output was 5 pT/$\sqrt{Hz}$ at 1 Hz. Digital output of the magnetometer showed linearity of $1{\times}10^{-4}$ and the offset drift was smaller than 0.2 nT during 1 h.

• Journal of Korea Society of Industrial Information Systems
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• v.20 no.4
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• pp.103-109
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• 2015

This paper presents the development of a ROM writer for shmoo test of a flash memory integrated into the MCU(Micro Controller Unit). A shmoo test is a graphical display of the response of a component or system varying over a range of conditions and inputs. Often used to represent the results of the testing of complex electronic systems such as computers or integrated circuits such as DRAMs, ASICs or microprocessors. A shmoo test and data write time(32k) of the development ROM writer is 6.4 seconds, which was improved by about 20% compared to the rate of the currently used ROM writer.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.11
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• pp.872-879
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• 2017

This work presents a cable fault monitoring system based on the differential frequency domain reflectometry using a compact impedance analyser which is composed of a direct digital synthesizer, an op amp and a gain/phase detector with a micro controller. The proposed system can replace expensive vector network analysers for frequency domain reflectometry and therefore be deployed in sensor networks for long term multi-point cable monitoring. Effectiveness of the system is experimentally confirmed by diagnosing the status of the power cable.

• Journal of Power Electronics
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• v.10 no.2
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• pp.187-193
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• 2010

This paper proposes a cooling system using thermoelectric elements for improving the output of building integrated photovoltaic (BIPV) modules. The temperature characteristics that improve the output of a BIPV system have rarely been studied up to now but some researchers have proposed a method using a ventilator. The efficiency of a ventilator depends mainly on the weather such as wind, irradiation etc. Because this cooling system is so sensitive to the velocity of the wind, it is unable to operate in the nominal operating cell temperature (NOCT) or the standard test condition (STC) which allow it to generate the maximum output. This paper proposes a cooling system using thermoelectric elements to solve such problems. The temperature control of thermoelectric elements can be controlled independently in an outdoor environment because it is performed by a micro-controller. In addition, it can be operated around the NOCT or the STC through an algorithm for temperature control. Therefore, the output of the system is increased and the efficiency is raised. This paper proves the validity of the proposed method by comparing the data obtained through experiments on the cooling systems of BIPV modules using a ventilator and thermoelectric elements.

• The Transactions of the Korea Information Processing Society
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• v.7 no.2
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• pp.470-476
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• 2000

This paper describes an IP design of a low-power microcontroller using an architecture level design methodology instead of a transistor level. To reduce switching capacitance, the register-toregister data transfer is adopted to frequently used register transfer micro-operations. Also, distributed buffers are proposed to reduce a input data rising edge time. To reduce power consumption without any loss of performance, pipeline processing should be used. In this paper, a 4-stage pipelined datapath being able to process CISC instructions is designed. Designed microcontroller lessens power consumption by 20%. To measure a power consumption, the SYNOPSYS EPIC powermill is used.

• Proceedings of the KIEE Conference
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• 2003.07c
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• pp.1923-1925
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• 2003

본 논문은 유리 기판과 실리콘 기판의 양극접합과 CMP공정을 통하여 정전기력으로 구동되는 마이크로 비틀림 액추에이터를 제작하고 이 제작된 액추에이터의 성능을 개선하는 방법과 실험에 관한 것이다. 이 비틀림 액추에이터는 미소 거울로 사용하기 위해 제작하였다. 미소 거울은 영상을 정확히 반사하거나 회절 시키는 것이 목적이지만 MEMS 공정의 특성 문제로 인해 일관적인 성능을 나타내는 것이 비교적 힘들다. 따라서 이를 개선하기 위해선 구조적인 접근 보다 실제 구동될 때의 현상을 보상하는 것이 필요하다. 일정한 입력전압에 비례하는 미소 거울의 변위를 알고 이를 기준으로 하여 시스템을 구동하여야 한다. 여기서 인가되는 전압에 비례하는 변위가 정확한지 측정을 해야 하고 만약 오차가 있다면 이를 개선하여야 한다. 또한 구동 시 발생하는 overshoot 현상과 작은 떨림 현상을 줄이고 빠른 시간 내에 응답하도록 시스템을 보상하여야 한다. 본 논문에선 PID 제어기법을 사용하여 $0.5^{\circ}$의 각도로 구동할 때를 기준으로 이 때의 구동전압 200V를 인가하고 오차를 측정하여 시스템을 보상하였다.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2149-2151
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• 2003

본 논문에서는 마이컴(PIC16C74)과 Tabu 탐색법 및 지능기법(퍼지 및 신경회로망)을 이용하여 고정밀 제어 및 강인한 제어 성능을 가지는 초소형 DC 모터용 지능형 제어기를 개발하였다. 이를 위해 마이컴(PIC16C74)를 이용한 지능형 제어 알고리즘을 개발하고, 초소형 DC 모터용 드라이브 회로 설계 및 제작하였다. 개발한 초소형 DC 모터 지능형 제어기는 디지털 자동 용접캐리지에 적용할 예정이며, 다른 응용 분야로써는 자동배수장치, 반도체 분야, 산업용 로봇 분야 및 조립자동화 시스템 분야 등에 사용되는 구동모터에 적용함으로서 정밀도와 외부의 잡음에 대한 영향을 경감시켜 안정성과 효율향상 및 에너지절약이 가능할 것이다.