• Journal of the Korea Society of Computer and Information
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• v.16 no.5
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• pp.61-71
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• 2011

To measure the fatigue of metallic objects at high speed vibration while non-contact precision displacement measurement on how to have a lot of research conducted. Noncontact high-speed vibration detection sensor of the eddy current sensors and laser sensors are used, but it is very expensive. Recently, High-speed vibrations detection using an inexpensive inductive sensor to have been studied, but is still a beginner. In this paper, a new design of an inexpensive inductive proximity sensor has been suggested in order to measure high frequency dynamic displacements of metallic specimens in a noncontact manner. Detection of the existing inductive sensors, detection, integral, and amplified through a process to detect the displacement noise due to weak nature of analog circuits and integral factor in the process of displacement detection is slow. The proposed method could be less affected by noise, the analog receive and high-speed signal processing is a new way, because AD converter (Analog to Digital converter) without using the vibration frequency signals directly into digital signals are converted. In order to evaluate the sensing performance, The proposed sensor module using non-contact vibration signals were detected while shaker vibration frequencies from 30Hz to 1,100 Hz at intervals of vibrating metallic specimens. Experimental results, Vibration frequency detection range of the metallic specimins within close proximity to contactless 5mm could be measured from DC to 1,100Hz and vibration amplitude of the resolution was $20{\mu}m$. Therefore, the proposed non-contact inductive sensor module for precision vibration detection sensor is estimated to have sufficient performance.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.597-600
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• 2009

본 논문은 동물원의 모형과 유아인형을 이용하여 유아에게 동물의 학습을 유도하는 시스템의 개발이다. 동물원의 우리에 유아의 인형을 근접시키면, 모형의 밑부분의 센서와 인형의 센서가 On 신호를 미들웨어 시스템에 전송하고 미들웨어 시스템은 PC에 동물우리의 번호를 전송함으로 동물우리에 있는 동물의 각종 학습 내용을 Display 장치를 통하여 학습할 수 있도록 하였다. 유아인형이 동물우리에 근접하였을 때 보내는 신호와 이동하였을 때의 신호을 각각 다르게 하여 학습도중에 유아의 인형이 다른곳으로 이동하게 되면 Display장치의 화면도 다른 화면을 보여줌으로 동물원에서 유아기 바라보는 시간을 최대한 유사하게 구성하였다. 또한 유아인현이 동물 우리에 근접하였을 경우 멀티미디어 효과를 통하여 동물의 울음소리 및 서식형태 등 기본적인 학습을 할 수 있도록 하였으며, 한글, 영어, 수셈 학습을 동시에 할 수 있도록 구성하였다.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2019.08a
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• pp.215-215
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• 2019

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.231-234
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• 2007

The magnetic sensor using electromagnetic principle. which transfers magnatic into electric. is the electric component.It has been widely applied to the industry, university and the reseach. However there are some problems. Not only the korean domestic sensor manufacture skills are still lower then the advanced manufacture's but also production of sensor is not well organized yet. Due to cahnging excitation cvurrent, excitation freq and the rate magnetic permeability core, there sometimes would be distorted phenomena or loaded phenomena which result in limited measurment range. Therefore, the signal conversion device should support to receive undistorted and nice output. This paper focuses on both the design of signal transform circuit using inductive proximity sensor and the signal transfer equipment (Z device) which detects thickness of painted material.

• 전기의세계
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• v.43 no.5
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• pp.44-47
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• 1994

자기부상열차의 효율적인 추력제어 및 안전성 높은 운행을 위해서 고성능의 속도/위치 검출 시스템이 중요한 역할을 한다. 일반열차는 바퀴가 선로에 접촉하여 주행하므로 차축의 회전속도를 측정해서 열차의 선로위를 일정한 간격을 두고 부상하여 주행하므로 비접촉식 측정방법을 사용해야만 한다[1-5]. 특히, 고속으로 주행하는 자기부상열차의 속도를 측정하기 위해서는 응답속도가 빠른 센서시스템을 개발하며, 또한 열차주행에 수반되는 자기장의 영향을 극소화하도록 센서시스템을 설계해야만 한다. 본고에서는 전형적인 자기부상열차인 일본의 HSST 시스템(주행속도 100km/h)과 독일의 Transrapid 시스템(주행속도: 400km/h)에 적용되고 있는 속도/위치 검출 시스템의 작동원리를 상세히 설명한다. HSST 시스템은 유도무선(inductive radio system) 방법을 이용하고 Transrapid 시스템은 와전류근접센서(eddy-current proximity sensor)를 이용한다.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2304-2306
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• 2002

베어링 고장진단은 대부분 진동센서에 의한 근접 탐침에 의존하고 있어 설치 및 측정 상에 제약이 따른다. 최근 들어 전동기 전류를 이용한 베어링 고장진단의 가능성이 제시되고 있으나 베어링의 초기고장에 대한 연구는 없었다. 본 연구에서는 전동기 전류를 이용하여 베어링 외륜의 초기고장을 검출할 수 있는 기법을 제시하였다. 이 기법은 처리 데이터를 줄이고 신속한 고장검출을 위하여 고장진단 주파수 대역 설정방법을 제시하였으며 유도전동기 베어링 외륜 고장검출 실험을 통하여 이 기법의 유용성을 보였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.5
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• pp.709-714
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• 2018

Visual Reality technology is becoming more and more interesting as it attracts people's interest. VR technology is used in various markets such as games, animation, and education. However, there were many people experiencing motion sickness such as dizziness and headache due to the delay time between hardware such as a device for sending a video after experiencing a VR image and an HMD for reproducing an image. The system proposed in this paper focuses on the environment rather than the movement of the attraction and detects the dividing line existing on the path by the proximity sensor and accurately calculates the position on the path according to the user 's motion. Since the position of the user is synchronized with the VR image, the position error of the user is improved to 0.2%.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.9
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• pp.1131-1138
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• 2019

The importance of coatings has been increasing for different purposes such as prevention of static electricity of auto parts or products, improvement of abrasion and corrosion resistance, and enhancement of esthetics. As a method for measuring the thickness of a coating film, a contact method with probe is commonly used. However, it is problematic that accuracy of the sensor is degraded due to sensor output distortion or load phenomenon, which is caused by a change in magnetic permeability of the core. In this study, we propose a method to reduce the measurement error of the coating film by applying the optimized circuit design and the thickness measurement algorithm to the problems caused by the nonlinear characteristics. The tests result which have been taken with different thickness coating samples show that the measurement accuracy is within ${\pm}2%$.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.5
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• pp.895-901
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• 2016

Nowadays, the axle counter has been developed to the wide range of the track circuit blocks as well as the wheel detection device. The axle counter, as becoming an important device for the high speed railway, must be guaranteed in accordance with the safety. With considering the safety and the high speed, performance evaluation a wheel detection sensor is described in this paper. To increase the safety, digital proximity sensor instead of analog is employed in the wheel detection sensor. Therefor the wheel detection sensor can minimize noisy signals caused by the harsh railway environments. And, to meet the high speed railway requirements, the performance of the wheel detection sensor is also successfully verified using the speed simulator at the velocity 500Km/h.

• Proceedings of the KOSOMBE Conference
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• v.1998 no.11
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• pp.245-246
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• 1998

AMB(Active Magnetic Bearing) systems are popularly used in various areas. In biomedical engineering applications it is a key part of magnetically suspended rotary blood pumps. The special advantage of AMBs is that they enable the rotor to revolve with no physical contact and provide rotary blood pumps with better performances such as low hemolysis level. Fundamentally, AMB systems consist of three parts, proximity sensors for distance detection, microprocessor for control algorithm and power amplifiers for actuating electromagnets. We have developed an inductive type proximity sensor with satisfactory characteristics that can be used in AMB systems. Frequency response was flat at least up to 10 kHz and sensitivity, resolution$(>5{\mu}m)$ and sensing range(<5mm) of the sensor could be adjustable for various purposes. The characteristics of the completed model showed to have satisfactory behaviors compared with the commercially available ones that already appeared to have reliable behaviors in AMB systems.