• 한국광학회지
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• 제12권2호
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• pp.103-108
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• 2001

플라즈마 디스플레이 패널(plasma display panel :PDP)에서 방출되는 광의 3차원 분포를 측정하기 위한 scanned point-detecting system(SPDS)을 고안하여 제작하였으며 이 시스템을 이용하여 실제 PDP의 3차원 광 방출 특성을 측정하고 해석하였다. SPDS는 상면에 핀홀이 달려 있는 광검출기(point detector)를 위치시킴으로써 특정 지점으로부터 방출되는 광만을 검출할수 있다. 3차원 물체의 특정 지점으로부터 방출된 광은 핀홀을 지나 검출기로 모두 입사되지만 다른 지점으로부터 방출된 광은 핀홀 앞에서 미리 집속되거나 핀홀 뒤에서 집속될것이므로 이러한 광들은 핀홀에 의해 대부분 차단될 것이다. 그러므로 물체의 특정 지점으로부터 방출된 광만이 핀홀이 설치된 검출기에 의해 검출되어 진다. SPDS를 이용하여 PDP cell 내에서 측정된 3차원 광 intensity 분포로부터 cellso의 방전현상을 다음과 같이 유추해낼수 있었다. Z축 측정이 진행될수록광의 intensity는 증가하였고 ITO전극의 안쪽부분에서 검출되는 광의 intensity가 가장 컸고 Y축 scan시 나타나는 X-Z평면에서 광의 intensity가 격벽과 격벽의 중심부분에서 가장 크게 나타났다.

• 한국정보처리학회논문지
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• 제7권7호
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• pp.2135-2148
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• 2000

Developing network software in embedded systems, such as digital set-top boxes, requires coding under limited computing resources. This paper presents the porting of Point-to-point Protocol (PPP) software, PPPD, to an embedded system. The PPP is the most popular link layer protocol for the information appliance, to an embedded system. In order to achieve this, problems to be solved for the porting were identified and methods to solve the problems were described. First, PPP source codes were divided into modules. Next, functions of each module were analyzed and interfaces between the modules were delineated. With the analysis results, porting to the embedded system was described. The normal operation of the ported software was verified with the help of a network packet analyzer. Finally, experiences during the porting were presented. The method developed in th paper can be applied to the porting of software to an embedded system as well as the porting of network software.

• Journal of Biosystems Engineering
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• 제17권3호
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• pp.223-228
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• 1992

This study was conducted to develop an electro-hydraulic three-point hitch control system using an electro-hydraulic servo valve and microcomputer and to investigate the performance of the three-point hitch control system through indoor and field experiments. 1. The results from indoor experiments coincided with those from computer simulation reported in the previous paper. However, the draft control with the value 4 of Kd showed a slight sustained oscillation after it reached the draft set. 2. From the field experiments, it appeared that the RMS errors increased with the ground speed of tractor. In position control, the three-point hitch control system with electro-hydraulic servo valve showed better performance than that with on-off electro-magnetic valve in the ground speed less than 1.6 m/s. In draft control, however, there was no significant differece in performance between those two systems. 3. In depth control, the both types of electro-hydraulic three-point hitch control system showed better performance than the conventional mechanical-hydraulic three-point hitch control system.

• 한국정보통신학회논문지
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• 제6권5호
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• pp.676-683
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• 2002

본 연구는 블루투스 모듈이 장착된 임베디드 시스템에 리눅스를 포팅하고 리눅스 커널상에 서 블루투스 프로토콜 스택을 작성해 LAN Access Point를 구현하는 것을 목적으로 한다. 임베디드 시스템을 위한 하드웨어를 구성하고 블루투스 모듈을 장착해서 리눅스 커널을 포팅한 후 Ethernet 디바이스 드라이버와 블루투스 프로토콜 스택을 작성해서 LAN Access Point를 구현한다. 블루투스 모듈이 장착된 PC를 클라이언트로 LAN Access Point를 통한 TCP/IP 통신의 가능성을 검증한 결과 블루투스 LAN Access Point를 통한 클라이언트의 Telnet, FTP, 웹브라우저 프로그램 등의 실행이 가능함을 확인하였다.

• International Journal of Aeronautical and Space Sciences
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• 제10권2호
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• pp.86-94
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• 2009

This paper deals with the creation of a new, low-cost point/position tracking system that can measure deformations in engineering structures with simple commercially widespread cameras. Though point tracking systems do exist today, such as Stereo Pattern Recognition (SPR) and Projection Moir$\acute{e}$ Interferometry (PMI) systems, they are far too costly to use to analyze small, simple structures because complex optical components such as large flashes, high-resolution cameras and data acquisition systems with several computers are required. We developed a point tracking system using commercial cameras. This system used IR LEDs and commercial IR CCD cameras to minimize the interference posed by other extraneous light sources. The main algorithm used for this system is an optical point tracking algorithm, which is composed of the point extraction algorithm and the point matching algorithm for 3-D motion estimation. a series of verification tests were performed. Then, the developed point tracking system was applied to measure deformations of an acrylic plate under a mechanical load. The measured deformations of the acrylic plate matched well with the numerical analysis results. The results indicate that the developed point tracking system is reliable enough to measure continuous deformed shapes of various engineering structures.

• Journal of Mechanical Science and Technology
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• 제17권8호
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• pp.1133-1139
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• 2003

In this paper, a numerical algorithm for the kinematic analysis of a multi-link five-point suspension system is presented. The kinematic analysis is carried out in terms of the rectangular Cartesian coordinates of some defined points in the links and at the joints. Geometric constraints are introduced to fix the relative positions between the points belonging to the same rigid body. Position, velocity and acceleration analyses are carried out. The presented formulation in terms or this system of coordinates is simple and involves only elementary mathematics. The results of the kinematic analysis are presented and discussed.

• 대한임베디드공학회논문지
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• 제8권3호
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• pp.155-161
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• 2013

To reduce the personnel and material loss caused by fire, we propose the automatic fire extinguishing system based on the ignition point tracking using the flame detecter. This automatic fire extinguishing system is composed of the flame detecting system and the fire extinguishing system based on the water cannon. We study the method for the ignition point tracking and the automatic fire extinguishing using the water cannon and the flame detecter. The flame detecting system for the early fire detection and the ignition point tracking has to be satisfied the requirement of the detecting range and the flame detection time. So we study the signal process algorithm for an improvement of the flame detecting system.

• 전기학회논문지
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• 제65권12호
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• pp.2113-2118
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• 2016

The precise detection of electric leakage point of underground power cable is very important to reduce cost and time of maintenance and prevent electric shock accident through expedite repair of electric leakage point. This paper proposes a electric leakage point detection system underground power cable using of half-period modulated transmission waveform and earth electric potential measurement. The developed system is composed of transmitter to generate the wanted pulse waveform, receiver to measure and display earth electric potential by the transmitted pulse in electric leakage point and PC Software program to display of GPS coordinate on detection cable line. The performance of the electric leakage point detection system was tested in the constructed underground cable leakage detection test bed. The test results on signal generation voltage precision of signal transmitter, mean detection earth voltage, mean detection leakage current and electric leakage point detection error showed the developed system can be used in electric leakage point detection underground power cable.

• 한국게임학회 논문지
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• 제4권4호
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• pp.25-30
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• 2004

현재, 웹 기반 기술 및 네트워크 기술의 발달로 인해 실질적이고 다양한 서비스를 원하는 이용자들이 늘어나고 있다. 그중에서 게임을 포함하는 웹 및 모바일 컨텐츠 분야에 대한 관심은 급격히 증가하고 있다. 대부분의 컨텐츠들은 컨텐츠의 이용에 대한 결과로 포인트나 E-Money로 제공하고 있다. 하지만, 포인트 시스템은 포인트를 활용할 수 있는 컨텐츠나 관련 서비스가 부족한 실정이어서 유명무실하게 되었다. 이러한 문제를 해결하기 위하여, 본 논문에서 여러 컨텐츠에서 제공하고 있는 포인트 시스템을 통합하고 이러한 포인트를 이용하여 게임에 접목할 수 있는 시스템을 설계하였다. 설계한 시스템을 시뮬레이션하기 위하여 웹상에서 간단한 게임 및 기타 부가적인 컨텐츠 시스템을 제작하였다. 또한, 모바일 기기로 웹상에서 발생하는 결과를 전송받는 시스템도 구현하였다.

• 산업경영시스템학회지
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• 제23권58호
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• pp.29-39
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• 2000

This paper concerns the location of the transit point between adjacent loops and guide direction of loops in the tandem configuration manufacturing system. The tandem configuration has been used to solve control problems like the vehicle dispatching and traffic control. The transit point between loops needs to deliver the parts from one loop to another. The location of transit point between adjacent loops and direction of loops must be determined to minimize the total travel time of parts in the manufacturing system. The model formulation is developed, a numerical example is shown.