• Proceedings of the KIEE Conference
• /
• 2006.07d
• /
• pp.1947-1948
• /
• 2006

본 논문에서는 컴퓨터로 정밀 계측기기들을 자동 제어하고 데이터를 측정하기 위하여 기존의 상용 프로그램을 사용하지 않고 Excel VBA(Visual Basic for Applications)를 이용하는 방법에 대하여 연구하였다. 이는 반복측정 및 통계적 수치계산 등에서 많은 장점을 지니고 있어 수많은 국가교정기관 및 일반 산업체에서 유용하게 사용될 수 있으리라 사료된다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.5 no.1
• /
• pp.29-33
• /
• 2004

In this paper, I'm tying to define the connection of the Device Characteristics and the Error Terms, and yield maximum estimated value of the mismatching errors by modeling the individual devices with signal-flow graph, and by seeking the transfer function of the system with the mismatching error in the combination of the devices using the Signal-flow Graph Gain Formula.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2013.11a
• /
• pp.1455-1456
• /
• 2013

최근 스마트 이동단말에 장착된 영상 센서를 통해 획득한 영상에서 실시간으로 사용자의 눈을 인식하거나 시선을 추적하여 콘텐츠 제어, 행태 분석 등을 수행하는 기술에 대한 필요성이 증가하고 있다. 기존의 영상 분석 기반 시선 추적 기술은 고가의 시선 추적기를 기반으로 하며, 추적한 시선 좌표를 통해 실제 응시객체를 분석하는 사후 작업이 필요하다. 이에, 본 논문에서는 OpenCV를 기반으로 스마트 이동단말의 전면에 장착된 영상 센서에서 사용자의 눈을 인식하고, 시선을 추적한 후, 이를 실시간으로 시선 좌표와 화면의 콘텐츠 내 객체 영역을 매칭함으로써, 응시객체를 분석하는 스마트 이동단말 기반 시선 추적기를 설계하였다. 본 논문의 시선 추적기는 시선 추적을 수행하기 위해, 사용자에게 5개의 화면 교정점을 제공하고 응시하도록 하여 시선 추적 범위를 측정한다. 또한, 스마트 이동단말에 내장된 자이로스코프 센서를 통해 기울기가 변경될 시, 이를 반영하여 시선 교정을 수행하도록 설계하였다.

• Journal of Institute of Control, Robotics and Systems
• /
• v.17 no.11
• /
• pp.1125-1131
• /
• 2011

This paper presents a control theoretic approach to realizing fault tolerance in asynchronous sequential circuits. The considered asynchronous circuit is assumed to work in space environment and is subject to faults caused by total ionizing dose (TID) effects. In our setting, TID effects cause permanent changes in state transition characteristics of the asynchronous circuit. Under a certain condition of reachability redundancy, it is possible to design a corrective controller so that the closed-loop system can maintain the normal behavior despite occurrences of TID faults. As a case study, the proposed control scheme is applied to an asynchronous arbiter implemented in FPGA.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.1935-1936
• /
• 2008

본 논문은 High speed image를 획득하기 위하여 CMOS Image Sensor를 사용한 고속카메라 구현에 관한 연구이다. Image Sensor로는 CCD Image Sensor와 CMOS Image Sensor가 있으며 CMOS Image Sensor는 CCD Image Sensor에 비해 전력소모가 적고 주변회로의 내장으로 소형화 할 수 있는 장점이 있다. 고속카메라는 충돌 테스트, 에어벡 제어 등의 자동차 분야와 골프 자세 교정 장치와 같은 스포츠 분야, 탄도 방향 측정 장비 등의 국방 분야 등 여러 분야에 많이 사용되고 있다. 본 논문에서 구현한 고속카메라 시스템은 CMOS Image Sensor를 사용하여 1280 * 1024의 해상도로 초당 약 500 frames의 영상을 획득할 수 있다. 또한 CMOS Image Sensor를 제어하고 획득한 이미지를 저장할 수 있도록 FPGA와 DDR2 메모리를 사용하고 저장된 데이터를 PC로 전송하기 위한 Camera Link 모듈 그리고 PC에서 카메라를 제어할 수 있도록 RS-422 통신기능 등으로 구성되었다.

• KSBB Journal
• /
• v.4 no.3
• /
• pp.197-202
• /
• 1989

The existing analog controllers for typical fermentation variables such as rpm and temperature were properly modified in order to be interiaced with microcomputers. Other necessary corrections like the impedance matching, the ground isolation, and the signal range adjustment were done for the successful interfacing between fermentor detectors and computers and for the eventual on-line feedback control of temperature and DO and the induction of the fermentation process with recombinant cells.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.22 no.4
• /
• pp.683-690
• /
• 2018

In this paper, a new signal processing technique is proposed for calibrating gain, phase, delay offsets in array antenna based anti-jamming minimum variance distortionless response (MVDR) global-positioning-system (GPS) receivers. The proposed technique estimates gain, phase and delay offsets across the antennas, and compensates for the offsets based on the estimates. A pilot signal with good correlation characteristics is used for accurate estimation of the gain, phase and delay offsets. Based on the cross-correlation, the delay offset is first estimated and then gain/phase offsets are estimated. For fine delay offset estimation and compensation, an interpolation technique is used, and specifically, the discrete Fourier transform (DFT) is employed for the interpolation technique to reduce the computational complexity. The proposed technique is verified through computer simulation using MATLAB. According to the simulation results, the proposed technique can reduce the gain, phaes and delay offset to 0.01 dB, 0.05 degree, and 0.5 ns, respectively.

• Korean Journal of Construction Engineering and Management
• /
• v.13 no.3
• /
• pp.25-33
• /
• 2012

The purpose of this study is an analysis of importance and requirement factors in the aspect of facility manager for correctional facility. For this study, It limited ranges of study in 11 correctional facilities that have been completed after 2000 years. It had survey and interview with managers of correctional facilities that are selected for study and then it derived the requirement factors of correctional facilities. Based on those requirement factors, Importance analysis is performed by using AHP method. The result of this study are as follows: 1) The fields are divided into architecture, building finishing, machinery, electricity fields and it derives details of each field. 2) The results of importance on requirements of managers in correctional facilities are as follows. Planing of building arrangement (10.9%) in architecture, secure plan for soundproof partition (14.1%) in building finishing, isolation lining of heating and cooling system(11.9%) in machinery, and improvement of control system(12.2%) in electricity.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.56 no.9
• /
• pp.1665-1675
• /
• 2007

This paper presents the problem of controlling asynchronous sequential machines in the presence of input disturbances, which may be also regarded as an adversary in a game theoretic setting. The main objective is to provide necessary and sufficient condition for the existence of a corrective controller that solves model matching problem of an asynchronous machine suffering from input disturbance. The existence condition can be stated in terms of a simple comparison of two skeleton matrices. The proposed controller eliminates the adversarial effect of input disturbance and makes the controlled machine mimic the behavior of a model in stable-state way. Whenever controller exists, algorithms for their design are outlined and demonstrated in a case study.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1995.10a
• /
• pp.623-627
• /
• 1995

This paper deals with the process which automatically straightens the shaft whose straightness is over the tolerance. The developed straightening process is composed of the measuring module and the control module. In the measuring module, the deflection of each measuring point is automatically measured, and the press point and the reference press stroke is determined. In the control module, the springback is predicted by the observer using the calculated reference press stroke and on-line-measured force and deflection. Through a series of experiments, the validity of the proposed process was verified.