• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.230-232
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• 2008

본 논문은 정상상태에서의 태양광 PV 모듈의 출력특성을 가지며 일사량과 온도의 변화에 따라 가 변하는 I-V 곡선의 특성을 나타내는 태양광 어레이 시뮬레이터의 제작에 관한 연구 결과이다. 본 시뮬레이터는 태양전지의 I-V 곡선상의 동작점을 실시간으로 표시하여, 가변하는 일사량과 온도를 설정하는 유저 인터페이스를 Labview 프로그램으로 구현하였으며 직류 프로그래머블 전원장치(DC programmable power supply)를 GPIB로 연결하여 구현하였다. 정상 부하조건 뿐만 아니라 개방조건, 단락조건에서도 동작하는 태양전지 동작점 추적 알고리즘을 개발하였으며 실험을 통하여 제안한 알고리즘의 효용성을 확인하였다.

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1570-1572
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• 2001

고전압 시험 진행시, 시험전압의 파고치, 순시강하, 정현파로부터의 편차, 규약 파두장과 같은 시간특성을 측정할 때는 일반적으로 IEC60060-2에 따른 인증절차를 거친 장치를 사용해야 한다. 최근 LG산전 전력시험 기술센타의 고전압 시험실은 기존의 아날로그 오실로스코프를 디지털 오실로스코프로 교체하고 PC와 GPIB를 이용해 시험변수의 자동 계산을 위해 관련 소프트웨어를 개발했다. 또한, 새로 구축한 측정시스템의 성능검증을 위해 산업체 인증기관인 LG산전이 보유하고 있는 기준계측시스템과의 비교시험을 실시하고 측정 불확도를 산출하였다. 따라서 본 논문에서는 새로운 측정 시스템에 적용한 성능시험방법과 불확도 산출방법, 소프트웨어의 기능과 성능에 대해 소개하고자 한다.

• Journal of KSNVE
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• v.8 no.5
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• pp.879-886
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• 1998

An automated calibration system of sound level meters was developed and tested. As a standard sound source, the speaker unit(Forstex FE208) cabineted by 440$\times$390$\times$490 $\textrm{mm}^3$(LHW) volume wood box was adopted. Including this source, the driving part was found out to have a good linearity of sound pressure output vs AC voltage input. The Hybrid-Bisect/Newton-Raphson method modified by the linearity was adopted as a searching algorithm. Uisng GPIB interface, the console PC make the control, measurements, and calculations and finally make the accumulation of useful data and results automatically by the instructon in the program coded by C languate. Several trials of automatic calibration using this developed system give the reliable results.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.314-317
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• 2003

In this paper, a measurement and analysis program is developed, that can be utilized to measure and analyze radio propagation characteristics. This program is able to control the measurement instruments including spectrum analyzer through a GPIB interface, and analyze the measured data to yield mean excess delay and RMS delay spread. The measured path loss can be compared with theoretical path loss in free space or inside tunnels. The measured and analyzed results can also be presented in the forms of graphs. As those tasks can be conducted on the measurement spot, this program is very helpful for performing and verifying measurements.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.11a
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• pp.132-133
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• 2005

고분자 절연재료의 혼합사용을 통한 계면의 전기적 특성 및 온도 특성을 조사하기 위하여 XLPE층 과 EPDM 층을 각각 단일층 및 이중층으로 적층하였으며, 온도는 상온에서 100 [$^{\circ}C$]까지 변환시키면서 유전정접을 측정하였다. 또한 data는 LABview를 이용하여 GPIB통신으로 받아들인 값을 평균치를 구하여 컴퓨터에 저장하였다. 측정결과 온도에 무관하게 이층구조는 단일층 사이의 값을 나타내며, 온도증가에 따라 XLPE 단일층의 변화가 크게 나타났으며, 이중층은 EPDM의 변화에 크게 의존함을 확인할 수 있었다.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.47-47
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• 2000

Most measuring devices are equipped with RS-232 or GPIB interface for communicating data with computers. If the measuring devices can be accessed by a server computer, the valuable information from the devices can be effectively shared with other computers via internet. But, if the measuring devices and the server computer are too far away, it is difficulty to directly connect them by RS232 interface. PSTN(Public Switched Telephone Network) refers to the world's collection of interconnected voice-oriented public telephone networks. Measuring computer system which is equipped with RS232 interface and modem for PSTN can be introduced to overcome the aforementioned distance problem, In this work, an internet based remote monitoring system which utilizes PSTN and VRML for 3-dimensional GUI is proposed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.153-154
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• 2006

Development of sorting machine for photo diode and its control system is addressed. The sorting machine for optical communication device requires high positional precision because the alignment is one of the most important point in the sorting process. This sorting method describes how to detect the target chip's angle and position from the wafer. The machine vision system is used for the feedback control. This sorting machine is implemented by motion controller, machine vision and various solenoid valve and is interfaced with RS-232c, GPIB and PCI communication. This system gets the position accuracy within $1{\mu}m$ with our experiments.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2277-2279
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• 1999

We have investigated the characteristic analysis of ultrasonic in case of occurring partial discharge in experimental steel chamber. This study presents the discriminative method of partial discharge by optimum threshold value. We have carried out the experiments of measuring partial discharge numbers between ultrasonic sensor and transducer with changing distance and barrier inside steel chamber. After the measured data were trasformed A/D conversion by GPIB, we used the optimum method of threshold value for counting numbers of partial discharge.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.1969-1971
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• 2000

This paper presents a data acquisition and analysis program modules that has been developed using the Labview program. These program modules can use to acquire and analyze leakage current data of insulator under different contamination conditions. The experimental hardware made up salt fog chamber, AC/DC power supply, transducer (shunt resistor), measurement devices and PC with the GPIB (General Purpose Interface Bus). And analysis program modules can calculate pulse level count, accumulated charge, average leakage current, power spectrum, and harmonics. The result of applying these analytical program modules to polymeric insulator is available for evaluation of leakage current characteristic of outdoor insulators.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2808-2810
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• 2000

Most measuring devices are equipped with RS232 interface or GPIB interface for communicating with computers. If the measuring devices can be accessed by a server computer, the valuable information from the devices can be effectively shared with other computer via internet. VRML is a web based technology for specifying and delivering three-dimensional interactive visualizations over the internet through a web browser. This paper proposes a remote 3-dimensional monitoring system for digital multimeter equipped with RS232 interface by utilizing VRML.