• Tribology and Lubricants
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• 제15권3호
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• pp.278-286
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• 1999

To predict the behavior of the intravascular micro active endoscope in the real human vascular system, a human mock circulation system was developed. The intravascular micro active endoscope which consists of micro active bending catheter and micro drug infusion catheter was driven in the velocity, Re number and temperature controlled flow. The three SMA (Shape Memory Alloy) zigzag type spring in the micro active bending catheter was heated by the electric current generated by PWM controller, and the shape memory effect made the actuator bend to any direction. The micro drug infusion catheter was driven through the inner hole of the micro active bending catheter. A mock circulation system is shaped from Ascending Arota to Femoral artery according to a human data (the data contains many vascular sizes and hydrographs of many control points). We developed a vascular model with glass and silicone tubes, and set the flow system with circulation parts, flow settling parts, and lots of valves. The heater and heat-controller was added to the How system to centre! the temperature of the How at 36.5$^{\circ}C$. The result showed that the developed intravascular micro active endoscope could be induced to any point in the vascular model.

• ETRI Journal
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• 제6권3호
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• pp.67-72
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• 1984

• 대한전자공학회논문지SD
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• 제41권6호
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• pp.71-80
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• 2004

본 논문은 8비트 마이크로 컨트롤러인 8051과의 호환성을 가진 16비트 마이크로 컨트롤러의 설계 및 검증 과정에 대해서 다루고 있다. 설계 디자인의 동작을 확인하기 위해 명령어별 검증과 명령어 조합에 의해 생성된 다양한 형태의 명령어 셋을 검증했다. 또한 다양한 형태의 명령어를 보다 효율적으로 검증하기 위한 방법을 제시한다. IMA-ADPCM, SOLA 등의 응용 프로그램의 검증을 통해서 설계 디자인의 동작을 확인하였다. 최종적으로 Xilinx FPGA(XCV1000-560C)를 이용한 보드 구현을 통해서 명령어 및 응용 프로그램 등의 동작을 검증했다. 타겟 컨트롤러인 8비트 마이크로 컨트롤러, 8051과의 호환성 및 성능비교를 통해서 널리 사용 중인 8051을 대체 할 수 있고 보다 나은 성능을 발휘할 수 있다는 것을 보인다.

• 전자공학회지
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• 제25권5호
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• pp.31-41
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• 1998

With the advent of portable electronic systems, power consumption has recently become a major issue in circuit and system design. Furthermore, the sophisticated fabrication technology makes it possible to embed more functions and features in a VLSI chip, consequently calling for both higher performance and lower power to deal with the ever growing complexity of system algorithms than in the past. VLSI designers should cope with two conflicting constraints, high performance and low power, offering an optimum trade off of these constraints to meet requirements of system. Historically, VLSI designers have focused on performance improvement, and power dissipation was not a design criteria but an afterthought. This design paradigm should be changed, as power is emerging as the most critical design constraint. In VLSI design, low power design can be accomplished through many ways, for instance, process, circuit/logic design, architectural design, and etc.. In this paper, a few low power design examples, which have been used in 8 bit micro-controller core, and can be used also in 4/16/32 bit micro-controller cores, are presented in the areas of circuit, logic and architectural design. We first propose a low power guidelines for micro-controller design in SAMSUNG, and more detailed design examples are followed applying 4 specific design guidelines. The 1st example shows the power reduction through reduction of number of state clocks per instruction. The 2nd example realized the power reduction by applying RISC(Reduced Instruction Set Computer) concept. The 3rd example is to optimize the algorithm for ALU(Arithmetic Logic Unit) to lower the power consumption, Lastly, circuit cells designed for low power are described.

• 한국위성정보통신학회논문지
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• 제7권2호
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• pp.54-58
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• 2012

본 논문에서는 사용자가 존재할 때만 LED 조명을 활성화해서 통신 기능을 수행하고 사용자가 없을 때에는 자동으로 LED 조명을 비활성화 할 수 있는 종합 제어 시스템 기반 기술을 디자인하고 구현하였다. 이 시스템은 마이크로 콘트롤러를 이용한 사용자 감지기능을 수행하는 HW 모듈과 웹을 통한 종합 제어 시스템 SW 모듈로 구성된다. 마이크로 콘트롤러 보드는 ATMega2560를 이용하여 설계하고, 적외선과 초음파 센서를 이용하여 사용자 유무를 판단하였으며, 웹 기반의 모니터링 시스템은 스마트 디바이스를 통해서 제어할 수 있도록 구성하였다. 두 모듈의 연동 테스트를 통해서 본 시스템의 유효성을 검증하였다.

• Advances in materials Research
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• 제2권4호
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• pp.181-193
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• 2013

Description and theory of spin coating technique has been elaborately outlined and a spin coating machine designed and fabricated using affordable components. The system was easily built with interdisciplinary knowledge of mechanics, fluid mechanics and electronics. This equipment employs majorly three basic components and two circuit units in its operation. These include a high speed dc motor, a proximity sensor mounted at a distance of about 15 mm from a reflective metal attached to the spindle of the motor to detect every passage of the reflective metal at its front and generate pulses. The pulses are transmitted to a micro-controller which process them into rotational speed (revolution per minute) and displays it on a lead crystal display (LCD) which is also a component of the micro-controller. The circuit units are a dc power supply unit and a PWM motor speed controlling unit. The various components and circuit units of this equipment are housed in a metal casing made of an 18 gauge black metal sheet designed with a total area of 1, $529.2cm^2$. To illustrate the use of the spin-coating system, ZnO sol-gel films were prepared and characterized using SEM, XRD, UV-vis, FT-IR and RBS and the result agrees well with that obtained from standard equipment and a speed of up to 9000 RPM has been achieved.

• 전자공학회논문지
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• 제51권5호
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• pp.207-215
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• 2014

본 논문은 초소형 센서노드(이하 노드)에서 인터럽트 처리와 데이터 전송에 대한 지연에 대한 문제들을 해결하기 위해 Micro Real-Time Control System (MRTCS)을 제안한다. MRTCS은 제어노드와 Controller Area Network (CAN) 기반의 노드로 구성되어졌다. 제어노드는 소형 마이크로 제어기 (sMCU)에 Real-Time Operating System (RTOS)를 내장하여 설계하였다. 노드들은 sMCU 없는 CAN 기반의 디바이스이며, 다중 디지털 입출력과 CAN 제어기를 가지고 있다. 소형 실시간 시스템 설계를 위해, 오픈소스인 OCTAVE v3.6.4를 이용하여 시스템 성능에 대한 모의실험을 실시하였다. 모의실험을 통해 제안된 설계 기법을 이용할 경우 인터럽트 처리와 데이터 전송에 대한 지연이 감소하여 시스템 성능이 증가함을 알 수 있었다. MRTCS이 다양한 실시간 제어 시스템에 적용 가능함을 검증하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.2083-2086
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• 2004

Variable Structure Controller with effective tracking performance is propose to control micro actuator system. Propsed VSC(Variable Structure Control) technique is implemented to tracking control of comb driving system having high non-linearity. The tracking performance due to VSC technique is compared to conventional PD(Proportional Derivative) control technique, reveals improved results.

• 한국컴퓨터정보학회논문지
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• 제9권3호
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• pp.127-133
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• 2004

본 연구에서 개발하고자 하는 기기는 K형 열전대를 이용하여 온도를 제어 할 수 있는 온도제어 시스템으로써, 안정된 전압 레귤레이터, 22Bit 디지털 변환기와 분해능이 22Bit로 이루어졌다. 미소 전압을 25배 증폭 할 수 있게 하였고, 0～1200도 사이의 온도를 DC 0.1V～DC 4.7V내에서 제어하도록 설계하였다. PIC16C74로 Micro-controller의 software와 hardware의 블록 다아이 그램을 고안하였으며, VFD기능과 Power Block간에 인터페이스가 가능하도록 구성하였다.

• 생물환경조절학회지
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• 제1권1호
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• pp.61-71
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• 1992

This study is performed to develop an automatic irrigation control of system for effective water management in greenhouse. The automatic irrigation control system is composed of an IR-RED optical sensor in tensiometer and an One-chip micro controller. The following results are obtained : 1. A practical IR-RED optical sensor in tensiometer, which shows the starting point of irrigation, was developed. 2. The automatic irrigation system with the optical sensor and One-chip micro controller was developed and also designed to be able to combine with the control system for temperature, curtain opening, etc. 3. A multiple irrigation control system for several greenhouses were suggested. 4. The results of the system test with the driving program for automatic water management were excellent.