• 한국정보통신학회논문지
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• 제20권1호
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• pp.215-221
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• 2016

본 논문은 대량의 입력 신호를 받아들이기에 부족한 수십 개의 입출력 포트를 가지는 저가의 8비트 원칩 마이크로 컨트롤러로 키패드 인터페이스 회로와 RS485통신을 이용하여 평면에 25mm의 간격으로 2차원적으로 균일하게 배치된 1600개의 대용량 스위치 입력 신호를 초당 10회의 실시간으로 PC로 읽어 들이고, 얻어진 스위치 정보의 물리적 패턴을 분석한 보행 분석실험의 실례를 들어 스텝분석이나 물리적인 입력의 패턴 분석이 필요한 각종 스포츠, 댄싱, 오락분야 혹은 대량의 스위치 및 센서 입력이 필요한 산업분야 등에 사용되어질 수 있음을 보이고자 한다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1994년도 춘계학술대회
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• pp.53-56
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• 1994

We have developed biological signal measurement modules and data acquisition and control card for a biological signal measurement, archiving, and communication system (SiMACS). Biological signals included in this system are ECG, EEG, EMG, invasive blood pressure, respiration, and temperature. Parameters of each module can be controlled by PC-base IDPU (intelligent data processing unit) through a data acquisition and control card. The data acquisition and control card can collect up to 16 channels of biological signals with sampling rate of $50\;{\sim}\;2,000Hz$ and 12-bit resolution. All measurement moduls and data acquisition functions are controlled by microcontroller which receives commands from PC. All data transfers among PC, microcontroller, and ADC are done through a shared RAM access by polling method for real rime operation.

• Journal of Electrical Engineering and Technology
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• 제9권6호
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• pp.2114-2117
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• 2014

Joint pain is generally a common disorder not only for the old aged people but also for the immunocompromised patients. The present proposed study reveals the presence of inflammatory diseases in joint generally diagnosed by removing synovial fluid and changes in the volume and composition are examined for the presence of WBC and crystals. This study implement a non-invasive approach to identify the changes in joint fluid by measuring the changes in electrical property of the synovial tissue under the influence of electrical current signal with frequency range between 100 kHz to 300 kHz. The response of tissue for the current signal was measured in terms of potential drop across the tissue. The hardware system design consists of input and output sections. The input section which applies current signal to upper limb joint region is made of ICL8038 function generator IC with amplifier and voltage to current converter. The output section picks voltage variation using metal surface electrode, amplifier, ADC, PIC microcontroller and LCD interface. 100 patient inclusive of normal and disease affected patients where examined for upper limb synovial fluid variation and inflammatory diseases were identified.

• 한국산학기술학회논문지
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• 제12권1호
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• pp.357-363
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• 2011

본 논문에서는 간단한 LCD CCFL백라이트 공진형 인버터를 제안한다. 먼저 서론에서 다양한 전통적 CCFL 인버터의 토폴로지들을 간략하게 살펴보고, 그 다음 각 본론에서 제안한 인버터에 대하여 구체적으로 설명한다. 제안한 인버터는 단일스위치를 가진 새로운 E-계열 공진회로를 이용하며 단일칩 마이크로컨트롤러에 의해 제어된다. 그리하여 제안한 컨버터는 매우 간단하다. 더욱이 제안한 컨버터는 대부분의 동작조건에서 공진 영전압스위칭을 확보할 수 있으며 디지털 디밍제어를 간단하게 수행한다. 제안한 인버터가 LCD CCFL백라이트 인버터로 좋은 성능을 가지고 있음을 실험결과를 통하여 보인다.

• 대한전자공학회논문지SD
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• 제43권10호
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• pp.74-79
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• 2006

Advanced Microcontroller Bus Architecture (AMBA) 기반 System-on-Chip (SoC)에서는 기능적 테스트를 위해 ARM사의 Test Interface Controller (TIC)를 사용한다. 따라서 구조적 스캔 테스트 패턴도 TIC와 AMBA 버스를 통해 인가하면서 스캔입력과 출력을 동시에 수행할 수 없다는 단점이 있다. 본 논문에서는 ARM 코어를 사용하는 SoC 테스트를 위한 AMBA based Test Access Mechanism (ATAM)을 제안한다. 기존 TIC와의 호환성을 유지하고 스캔 입력과 출력을 동시에 할 수 있으므로 고가의 Automatic Test Equipment (ATE)를 통한 테스트 시간을 대폭 절감할 수 있다.

• 전력전자학회논문지
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• 제12권5호
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• pp.355-363
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• 2007

본 논문에서는 무변압기형 3상 계통연계 PV PCS (photovoltaic power conditioning system)를 제안하였다. 태양전지의 국소 최대 전력점에서 발전하는 것을 방지하여 최대 전력점에서 발전을 하도록 개선한 P&O (perturb and observe) 방식의 MPPT (maximum power point tracking) 알고리즘을 제안하였다. 3상 전압형 인버터를 외부 직류 링크 전압제어기, 내부 전류제어기, 그리고 마이크로컨트롤러로 구현하기에 적합하도록 간단화한 공간벡터 변조법을 통해 제어하여 3상 계통연계 시 단위 역률을 실현하였다. 그리고 시스템의 안정성 향상과 역률 개선을 위해 직류 링크 전압을 더 빠르고 정확하게 제어하기 위한 알고리즘을 제안하였다. 모든 알고리즘과 제어기를 하나의 마이크로컨트롤러로 구현하고 제안된 알고리즘과 제어기의 우수성을 실험을 통해 검증하였다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제55권4호
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• pp.238-243
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• 2006

This paper presents novel ignition method for automotive 35W metal halide discharge lamp electronic ballast. At this study, the novel method of ignition is developed to reduce costs and size of the ballast. By use of the novel method, the voltage needed in ignition is decreased, which result in use of the lower voltage rating power devices compared with conventional method and product compactness was achieved by deleting a circuit generating negative voltage needed in ignition at an conventional circuit. In terms of luminosity, color rendering, light efficiency(lm/W) and lifespan, the metal halide lamp is superior to, but unlike halogen lamp, it have more complicated transient characteristics to reach its steady state than the conventional halogen lamp. Therefore, in this paper, the electronic ballast was designed such that the metal halide lamp could be optimized for the automotive, by applying a method of microcontroller-based digital control. The results of the proposed system is verified through various experiment results.

• 전기전자학회논문지
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• 제1권1호
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• pp.1-10
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• 1997

It is well-known that rectangular bulk-Si sensors prepared by etch or epi etch-stop micromachining technology are already in practical use today, but the conventional bulk-Si sensor shows some drawbacks such as large chip size and limited applications as silicon sensor device is to be miniaturized. We consider a circular-shape SOI(Silicon-On-Insulator) micro-cavity technology to facilitate multiple sensors on very small chip, to make device easier to package than conventional sensor like pressure sensor and to provide very high over-pressure capability. This paper demonstrates the cross-functional results for stress analyses(targeting $5{\mu}m$ deflection and 100MPa stress as maximum at various applicable pressure ranges), for finding permissible diaphragm dimension by output sensitivity, and piezoresistive sensor theory from two-type SOI structures where the double SOI structure shows the most feasible deflection and small stress at various ambient pressures. Those results can be compared with the ones of circular-shape bulk-Si based sensor$^{[17]}. The SOI micro-cavity formed the sensors is promising to integrate with calibration, gain stage and controller unit plus high current/high voltage CMOS drivers onto monolithic chip.

• International journal of advanced smart convergence
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• 제5권3호
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• pp.16-26
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• 2016

This proposed project is about a bicycle anti theft devised system which helps people protect the bicycle from theft and helps to track the stolen bicycle's location using a smart phone. Safety bike uses two main devices to keep the bicycle secured, the vibration sensor and GPS sensor. The purpose of this project is to put all these small devices into one well connected system which will help the bicycle owner have more control over the security of his own bicycle. The whole system can be divided into two main parts. The first part is about the hardware development whereby all electronics components are connected via the circuit design using wire wrapping technique. This hardware part includes, a vibrations sensor, a GPS receiver, a toggle switch, LED light, Bluetooth and a buzzer. Wireless Bluetooth signals are used as the means of communication between the smartphone and the microcontroller. The second part is the software part which is being to program and control the whole system. The program is written using MikroBasic, a full-featured Basic compiler for microcontroller based systems. In conclusion, this system is designed to enable user to have control in securing his/her bicycle also being able to find and locate it at any time using GPS receiver and mobile android application.

• 제어로봇시스템학회논문지
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• 제14권1호
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• pp.36-41
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• 2008

Cooling tower is an important equipment of the cooling systems for large buildings like factory and department store. Water used for cooling in cooling tower is reused continuously. If the water is polluted, corrosion and scale can happen at equipments and pipes. In order to prevent this problem, it is necessary to control the water quality using chemicals. To control the water quality, an automatic control system is designed, fabricated, and experimented. The control system is based on an imbedded microcontroller. Relays are used for power driving, an LCD and LED for display, and RS485 for remote data acquisition. Monitoring program is also developed for easy man-machine interface and extraction of data stored in the imbedded processor and EEPROM. The control system calculates amounts of chemicals necessary using sensor data and injects the chemicals into the cooling tower on proper time. The developed water quality control system is expected to reduce cost of maintenance and extend the lifetime of the cooling systems with low cost.