• Journal of the Optical Society of Korea
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• 제13권4호
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• pp.434-438
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• 2009

In this paper, a 12.5-Gb/s optical transmitter is implemented using 0.13-${\mu}m$ CMOS technology. The optical transmitter that we constructed compensates temperature effects of VCSEL (Vertical cavity surface emitting laser) using auto-power control (APC) and auto-modulation control (AMC). An external monitoring photodiode (MPD) detects optical power and modulation. The proposed APC and AMC demonstrate 5$\sim$20-mA of bias-current control and 5$\sim$20-mA of modulation-current control, respectively. To enhance the bandwidth of the optical transmitter, an active feedback amplifier with negative capacitance compensation is exploited. The whole chip consumes only 140.4-mW of DC power at a single 1.8-V supply under the maximum modulation and bias currents, and occupies the area of 1280-${\mu}m$ by 330-${\mu}m$ excluding bonding pads.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.319-321
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• 2007

This paper introduces a general overview of the 6000m class deep-sea ROV. Hemire and Henuvy. and then describes its motion control system. It is developed by Korea Ocean Research & Development Institute(KORDI) for 6 years since 2001. sponsored by the Ministry of Maritime Affairs and, Fisheries (MOMAF). Hemire is remotely operated by a fiber optic telemetry. where 6 thrusters are controlled by operator in manual mode and by auto depth control and auto heading control in auto mode. In this paper. operational mechanism of manual and automatic mode with some convenient functions for operator is desc.ribed. Finally, results of sea trial conducted at the Philippine sea where a depth is 5.770m are shown.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1095-1098
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• 2005

Most electronic chassis control systems until today have been designed with optimization on its own performance. However, According to the increase of the interest regarding a vehicle safety and development of information technique, the integration technique of current chassis systems is being emphasized. Each enterprise proposed it with name of GCC(Global Chassis Control) or UCC(Unified Chassis Control). This study realizes control algorithm of suspension and brake by using the vehicle model of low degree of freedom as the primary stage of realization of integrated chassis control system. The proposed algorithm build the simulation environment connected to the CarSim having full vehicle model of 27 degree of freedom for raising the thrust of results

• 생물환경조절학회지
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• 제23권1호
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• pp.26-30
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• 2014

본 연구에서는 과수의 형태, 거리에 따라 약대가 항상 적정 살포 거리를 유지하며 작업을 진행할 수 있도록 초음파 센서의 신호를 실시간으로 받아 약대를 제어하였고, 또한 약대의 보호를 위하여 진행 방향에 장애물이 존재할 경우 회피할 수 있도록 프로그래밍 하였다. 제작된 시스템으로 현장에서 비 자동제어 상태와 자동제어 상태로 실험을 수행하였다. 실험은 과수의 기둥과 잎 부위에 감수지를 일정간격으로 설치하고 시스템을 이용하여 분사한 후 감수지의 영상을 스캔하여 영상처리를 통해 분석하는 방법으로 이루어졌다. 상 방향 분사 실험에서는 시스템과 대상의 거리가 0.9m~1.1m로 설정해둔 적정거리를 벗어나지 않았기 때문에 비 자동제어와 자동제어 상태 모두 양호한 결과를 보였다. 하지만 측 방향 분사 실험에서는 비 자동제어 시 우측 열은 98.09%의 분사율을 보였으나 좌측 열은 69.25%로 낮게 나타났다. 이는 실험이 수행된 배 과원의 경우 과수의 좌측 열이 수평하게 식재되어 있지 않았기 때문으로 비자동제어 상태에서는 좌측열의 과수에 분사되는 양이 줄어들었으나 자동제어 상태에서는 좌, 우측열의 과수에 분사되는 양이 각각 92.66%, 94.64%로 균일하게 나타났다. 시스템의 제어 속도를 측정하기 위하여 방향 별 약대의 속도를 측정하였고 각각의 속도는 수직방향 100mm/s, 수평 방향 100mm/s, 각 변화 3o/s로 측정되었다. 초기 목적했던 바와 같이 과수의 형태, 거리에 따라 약대가 적정 거리를 유지하며 작업을 진행함으로 인해서 균일한 살포량을 유지 할 수 있음을 확인하였다.

• 한국조명전기설비학회지:조명전기설비
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• 제7권4호
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• pp.42-50
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• 1993

본 연구에서는 자동동조 퍼지 PID 제어 앨고리즘을 사용하여 유도전동기 구동방법을 제안하였다. 퍼지제어에서는 수학적인 모델링이 없이 경험적인 정보를 이용하면 제어가 가능하며 퍼지룩업 테이블을 적절히 이용하면 실시간 제어도 가능한 것이 특징이라 볼 수 있다. 또한, 퍼지규칙을 몇 개의 영역으로 구획하여 시스템의 변화가 발생되고, 또 파라미터의 변화가 유도 전동기 구동 특성에 크게 영향을 주는 것을 감안, 본 시스템의 고성능, 고정도제어를 위하여 퍼지 앨고리즘을 적용하여 파라미터가 자동동조 기능을 갖는 유도전동기의 구동 시스템을 설계, 제작하였으며 그 특성을 기존의 PID 제어방식과 비교하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.994-997
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• 2003

Simple tuning formulae are derived to design a Pl controller to meet the gain and phase margin specifications. These formulae are suitable for the auto-tuning of a process where the robustness should be guaranteed. The auto-tuned PI controller is examined for the speed regulation of a PM synchronous motor.

• 한국해양공학회지
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• 제21권2호
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• pp.67-74
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• 2007

Maritime and Ocean Engineering Research Institute (MOERI), a branch of KORDI, has designed and manufactured a model of an autonomous underwater vehicle (AUV) named ISiMI (Integrated Submergible for Intelligent Mission Implementation). ISiMI is an AUV platform to satisfy the various needs of experimental test required for development of challenging technologies newly investigated in the field of underwater robot; control and navigational algorithms and software architectures. The main design goal of ISiMI AUV is downsizing which will reduce substantially the operating cost compared to other vehicles previously developed in KORDI such as VORAM or DUSAUV. As a result of design and manufacturing process, ISiMI is implemented to be 1.2 m in length, 0.17 m in diameter and weigh 20 kg in air. A series of tank test is conducted to verify the basic functions of ISiMI in the Ocean Engineering Basin of MOERI, which includes manual control with R/F link, auto depth, auto heading control and a final approach control for underwater docking. This paper describes the implementation of ISiMI system and the experimental results to verify the function of ISiMI as a test-bed AUV platform.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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• pp.347-350
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• 2006

Maritime and Ocean Engineering Research Institute (MOERI), a branch of KORDI, has designed and manufactured a model of an autonomous underwater vehicle (AUV) named ISiMI(Integrated Submergible for Intelligent Mission Implementation). ISiMI is an AUV platform to satisfy the various needs of experimental test required for development of challenging technologies newly investigated in the field of underwater robot; control and navigational algorithms and software architectures. The main design goal of ISiMI AUV is downsizing which will reduce substantially the operating cost compared to other vehicles previously developed in KORDI such as VORAM or DUSAUV. As a result of design and manufacturing process, ISiMI is implemented to be 1.2m in length, 0.17m in diameter and weigh 20 kg in air. A series of tank test is conducted to verify the basic functions of ISiMI in the Ocean Engineering Basin of MOERI, which includes manual control with R/F link, auto depth, auto heading control and a final approach control for underwater docking. This paper describes the implementation of ISiMI system and the experimental results to verify the function of ISiMi as a test-bed AUV platform.

• International Journal of Contents
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• 제11권4호
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• pp.70-76
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• 2015

The development of technology provides and increases security as well as convenience for humans. The development of new technology directly affects the standard of life thanks to smart home automatic control systems. This paper describes a door control, automatic curtain, home security (CCTV, fire, gas, safe, etc.), home control (energy, light, ventilation, etc.) and web-based smart home automatic controller. It also describes the use of ARM (Advanced RISC Machines) for automatic control of home equipment, a Multi-Axes Servo Controller using FPGA (Field Programmable Gate Array) and PLC (programmable logic controller). Additionally, it describes the development of a HTML editor using web auto control software. The tab loading time (7 seconds) is faster when using ARM-based web browser software instead of Chrome and Firefox is used because the browser has a small memory footprint (300M). This system is realized by web auto controller language which controls and uses PLCs that are easier than existing devices. This smart home automatic control technology can control smart home equipment anywhere and anytime and provides a remote interface through mobile equipment.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.111-112
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• 2006

A new MR cylinder with built-in valves using Magneto - Rheological fluid (MR valve) is proposed for fluid power control systems. The MR fluid is a newly developed functional fluid whose obvious viscosity is controlled by the applied magnetic field intensity. This MR cylinder, which is composed of cylinder with small clearance and piston with electromagnet, has the characteristics of simple, compact and reliable structure. This paper presents a method to control the pressure of MR cylinder by using Generalized Predictive Control (GPC) algorithm. The differential pressure is controlled by applying magnetic field intensity to MR fluid. The use of GPC controller is to generate a control sequence by minimizing a cost function in such a way that the future system output is driven close to reference over finite prediction horizons. Experimental results from real time control using GPC method compared with conventional PID control method are also shown in this paper.