• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.2011-2013
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• 2004

본 논문은 그루빙(grooving),타이닝(tinning),텍스쳐(texture) 등의 포장 도로의 표면 상태를 고성능의 레이저 변위센서를 사용하여 정밀하게 측정하고, 측정한 표면 상태를 객관적으로 평가하는 장비 개발에 관한 논문이다. 본 논문에서는 실제 평가 장비 차량을 만들기에 앞서 전체 시스템을 설계하고, 실내에서 차량과 도로의 모사 장비를 만들어 실험하였다. 본 실험에서는 오실로스코프와 DAQ (Data Aquisition) 보드를 사용하였다. LabView로 선호처리 프로그래밍을 하여 컴퓨터 화면에 GUI 형태로 나타내었다. 측정 데이터는 컴퓨터의 저장 공간에 저장하여 후처리를 가능하게 하였다. 또한, 실제 평가 장비 차량에 장착하게 될, GPS(Global Positioning System) 시스템으로 부터 실시간으로 평가 장비 차량의 이동거리 데이터를 얻었다. 실험 결과 차량이 80km/h로 주행할 때 도로 표면 타이닝의 폭과 깊이가 평균 9.67% 오차를 보였으며, 이동거리는 0.03% 이내의 오차를 보여 만족할 만한 결과를 얻었다.

• Transactions of The Korea Fluid Power Systems Society
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• v.8 no.4
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• pp.9-16
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• 2011

Because of the increasing demand on the high precision and high response of a machinery, proportional control valves are widely adopted at various application fields. This paper studies on the static and dynamic characteristics of a pilot proportional pressure control valve. An experimental apparatus including hydraulic pump, variable speed inverter, pressure and flow sensors and data aquisition system was set up. And various experiments such as P-Q-V curves, step responses due to input voltage and flow rate, hysteresis, frequency response of the proportional valve was carried out and the results are discussed.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.11a
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• pp.222-222
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• 2009

Currently in electric railways, there are various test standards for catenary systems such as stability assessment standards and maintenance standards for appropriate vehicle operation. In Korea, maintenance vehicles are used to measure height, stagger, and wear of catenaries and various tests are being conducted based on maintenance manuals. In this paper, real-time data aquisition technologies for assessment of electric railway current collection status between catenaries and pantographs that are consistantely being developed from the adoption of electric railways were analyzed based on on-board measurement items.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1998.06a
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• pp.42-45
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• 1998

In this paper, a fuzzy control technique using adjustable scale factors and Lyapunov Function for the precise position control of DC servo system is introduced. The suitable scale factors were selected and the stable control input using the stability theory of Lyapunov function cam be applied. Therefore, the controlled system have the robustness against disturbances and can be stabilized because of reinforced adaptivity. This proposed fuzzy controller is implemented on a 80586 micro-computer which have of fuzzy inference routine part, manipulating part of scale factors and DT-2801 data aquisition board.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2405-2407
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• 1999

In recent, the application of polymeric insulators for outdoor is significantly increasing. These materials have shown good performance in service, but had disadvantages under long-term exposure to contamination and moisture, resulting in some problems. Thus, this study concentrated on the development of technique evaluating the insulating status. Experiment was referred to lEC publ. 587, with data aquisition system to monitor leakage current. The components of leakage current investigated were waveform and 3rd harmonic. FFT was conducted for the analysis of harmonic components. The distortion of waveform with application time of voltage was evident, and so the 3rd harmonic component.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.157-158
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• 2011

건설현장의 온도, 습도, 조도, GPS 위치정보 및 대기중의 CO2 농도 등의 환경 데이터는 공사 진행에 따라 설계 변경 또는 개선 등의 필요성이 있는 경우에 유용하게 이용될 수 있다. 건설현장에서의 이러한 환경 데이터를 획득 및 처리하기 위한 하나의 USN 시스템을 구현하여 본사 또는 해당 부서에 필요한 시간에 온라인으로 제공함으로써 현장의 현황파악을 위한 기초 자료 제공은 물론 시간과 노력을 줄일 수 있으며 특히 공사현장이 먼 거리에 떨어져 있을수록 더욱 유용하게 적용될 수 있다. 온도, 습도, 조도, GPS 위치정보는 설치 장소에 따라 적절한 해당 측정 정보를 제공하였으며 대기중의 CO2 농도는 자동차 또는 혼잡한 시내 거리 등에서 조금 높은 수치를 보였다.

• Korean Journal of Computational Design and Engineering
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• v.4 no.1
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• pp.60-68
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• 1999

In reverse engineering (RE) sustems, the quality of the data aquisition process is crucial to the accuracy of the reverse engineered three dimensional computer-aided design (CAD) model. However, these tasks are predominantly done manually, and little work has been done to improve the efficiency of scanning by determining the minimum number of scans and the optimal scanning directions. In this paper, new scanning and registration methods using tooling balls are developed to assist in determining the optimal parameter for these processes. When the object to scanned has no concavity, attaching path of the object and its bounding rectangle are used for optimal scanning and registration. Then minimum number of tooling balls and their positions are calculated automatically. In the case of concave parts, the scanning plan should include a complete scan of the concave area. With the surface normal vector and the scanning direction, the minimum degree of rotating the part can be calculated. But the maximum rotation should be restricted in order to prevent occlusion of the part. Finally tow sample part ar scanned based on the proposed methods and the results are discussed.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1594-1596
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• 1996

The NDT(nondestructive test) using pulse echo method with piezoelectric transducers and the system for NDT including image processing were studoed. The system consisted of pulse generator and receiver, two step motors for X-Y scanner, PC-Scope for data aquisition and PC-Lab for trigger and motor driving. We tested and estimated at one point under the following conditions : 1) just water, 2) Aluminum without any crack and 3) Aluminum with hole. The estimated NDT result of whole area (point : $35{\times}20$) is compared with real samples.

• Journal of Engineering Education Research
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• v.19 no.2
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• pp.3-7
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• 2016

A flow control system was designed and fabricated to control the flow rate of liquid through the pipe. This control system was composed of hardwares and software, hardwares as controller, gate valve, orifice meter and data aquisition board and software as National instruments Labview program. Control of flow rate was executed by adjusting the pneumatic valve located at the center of pipe line based on the control signal generated by LabView PID control algorithm, which converts analog signal measured by pressure difference of orifice to digital signal to adjust pneumatic valve. For the controller setup Ziegler-Nichols tuning technique was applied and control performances were investigated for not only the disturbance but also the set point changes. Developed system showed good control performances in flow control enough to use as teaching tool of feedback control theory and practice in university, and also as industrial application.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.950-955
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• 2003

This paper introduces an enhanced condition monitoring and diagnosis system recently developed for rotating machinery. In the system, the data aquisition/monitoring signal processing, machine condition classifier, case-based reasoning and demonstration modules are effectively integrated with user-friendliness so that machine operators can easily monitor and diagnose the status of rotating machinery in operation. Some of the new features include the directional spectrum, case-based reasoning and neural network techniques. And the demonstrator modules for fault diagnosis of a Bear driving system and for basic understanding of the rotor dynamics are provided to help the potential users better understand the system.