• 한국인터넷방송통신학회논문지
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• 제20권4호
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• pp.149-154
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• 2020

본 연구에서는 블루투스를 이용하여 스마트폰 으로 제어되는 Smart Diffuser 디바이스의 초기모델을 개발하였다. Smart Diffuser는 디바이스에 주입하는 오일을 분사시키기 위해 초음파 진동자를 이용하였다. 고휘도 LED를 사용하여 오일이 분사되는 동안에 색상 변화가 보여 지도록 디바이스를 개발하였다. 휴대용 디바이스인 점을 감안하여 충전 시간 문제를 해결하기 위해 40mAh의 Li-Po 배터리를 사용하여 장시간 사용할 수 있도록 설계를 하였다. Bluetooth Low Energy를 이용하여 저전력 구동을 구현을 함으로서 초기 설계모델의 유용성에 대해 확인 하였다.

• 한국통신학회논문지
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• 제39C권10호
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• pp.896-908
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• 2014

세계적인 인구 고령화와 생활수준의 향상에 따른 국민들의 건강에 대한 관심이 커지면서 최근 전자의료기기의 시장도 증대되고 있다. 수지형체외식초음파프로브는 허가 신청 건수가 높은 다빈도 허가 심사 대상 의료기기이며 최근 병원 등의 임상분야에서 그 활용도가 높다. 하지만, 수지형체외식초음파프로브의 성능 평가를 위한 국내 기준은 명확하게 마련되지 않은 실정이고, 허가심사 및 품질평가 등을 위한 가이드라인 조차 마련되어 있지 않다. 따라서 본 연구에서는 수지형체외식초음파프로브의 특성, 허가 및 시장현황을 조사하고, 관련 국내 외 규격을 검토하여 성능평가 시험항목, 기준 및 방법을 도출하였으며, 시험검증을 통하여 최종적으로 국제조화되고 국내 실정에 적합한 성능 평가 가이드라인을 마련하였다. 향후 본 연구결과를 의료기기 관련 업체에서 활용함으로써 수지형체 외식초음파프로브의 품질 및 성능 향상을 도모하고, 허가를 위한 심사 평가의 일관성을 확보할 수 있을 것으로 기대된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.321-321
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• 2010

In this paper, we propose a novel type shaft-less ring type ultrasonic motor. A traveling wave rotary type ultrasonic motor is selected as a base model. The newly designed stator has two piezoelectric ceramic rings which are bonded in sandwich shape as traveling wave generator. So, we can expect to produce higher torque. The proposed model has the rotor structure that coupled with the stator provokes the pressure, this model do not install the separate plate any spring device. We used the finite element method to verify the operation principle and to compute the vibration mode of proposed model.

• International Journal of Precision Engineering and Manufacturing
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• 제9권3호
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• pp.40-45
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• 2008

This paper presents a linear positioning system and its control algorithm design with nano accuracy/resolution. The basic linear stage structure is driven by an ultrasonic motor and its displacement feedback is detected by a LDGI (Laser Diffraction Grating Interferometer), which can achieve nanometer resolution. Due to the friction driving property of the ultrasonic motor, the driving situation differs in various ranges along the travel. Experiments have been carried out in order to observe and realize the phenomena of the three main driving modes: AC mode (for mm motion), Gate mode (for ${\mu}m$ motion), and DC mode (for nm motion). A proposed FCMAC (Fuzzy Cerebella Model Articulation Controller) control algorithm is implemented for manipulating and predicting the velocity variation during the motion of each mode respectively. The PCbased integral positioning system is built up with a NI DAQ Device by a BCB (Borland $C^{++}$ Builder) program to accomplish the purpose of an intelligent nanopositioning control.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2003년도 기술심포지움 논문집
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• pp.278-281
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• 2003

A new type of ultrasonic spray nozzle was fabricated with piezoelectric devices. The spray nozzle was designed for the chemicals dispersion in the water purification bath. The piezoelectric properties in ultrasonic spray nozzles were optimized for the better dispersion of chemicals for purification process. Ultrasonic spray nozzle was packaged in metal case with silicone resin for the water proof application.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 춘계학술대회 논문집
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• pp.29-32
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• 1998

A plate-type ultrasonic linear motor using longitudinal and bending multi-vibration mode was designed and fabricated for card-forwarding device. The rotor consisted of piezoelectric ceramic plate and elastic materials. The performances of the motor were measured. As the experimental results, no-load speed of the motor was 0.6 m/s at 80 V in applied voltage. Starting torque was 1.4 mNm and maximum efficiency was 1.2 %.

• 한국안전학회지
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• 제35권3호
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• pp.58-63
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• 2020

At the construction site of the driving site, the pile rebound and penetration measurements are performed manually to determine the end point of the driving operation, thereby causing the measurer to be exposed to a death accident. In this study, in order to eliminate the risk of this work, a non-contact penetration measuring device was developed and usability evaluation was conducted. The penetration measuring device is manufactured based on the ultrasonic sensor, and can be combined with the pile to deliver the data in real time, and the delivered data can be output in real time on the portable PC and the final penetration can be calculated. Usability evaluation on the device was conducted by comparison with manual work. Usability evaluation was largely evaluated on measured values, subjective comfort, and body parts comfort. The result of the measured value tended to overestimate the value measured manually by the measuring device, which is similar to the previous research. In terms of subjective comfort and body part comfort, overall satisfaction was higher than the manual method when using the measuring device. Taken together, these results indicate that it is possible to use the rudder measuring device in place of manual work in the construction site, and it is judged that the worker's comfort is greatly increased by using the measuring machine. The results of this study suggest that the use of non-contact measuring device in the field can be used as basic data to support them.

• Transactions on Electrical and Electronic Materials
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• 제13권5호
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• pp.215-220
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• 2012

Miniature ultrasonic and tactile sensors on Si substrate have been proposed, fabricated and characterized to detect objects for a dexterous robot. The ultrasonic sensor consists of piezoelectric PZT thin film on a Pt/Ti/$SiO_2$ and/or Si diaphragm fabricated using a micromachining technique; the ultrasonic sensor detects the piezoelectric voltage as an ultrasonic wave. The sensitivity has been enhanced by improving the device structure, and the resonant frequency in the array sensor has been equalized. Position detection has been carried out by using a sensor array with high sensitivity and uniform resonant frequency. The tactile sensor consists of four or three warped cantilevers which have NiCr or $Si:B^+$ piezoresistive layer for stress detection. Normal and shear stresses can be estimated by calculation using resistance changes of the piezoresitive layers on the cantilevers. Gripping state has been identified by using the tactile sensor which is installed on finger of a robot hand, and friction of objects has been measured by slipping the sensor.

• 한국생산제조학회지
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• 제23권4호
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• pp.385-391
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• 2014

A control system for ultrasonic spray pyrolysis deposition was developed that can coat a large size glass panel with a transparent conductive oxide. It consists of several ultrasonic atomizer devices to cover a large area and a host computer for individually controlling the devices. The sub-controller in an ultrasonic atomizer device can adjust the flow rate of the atomized conductive oxide gas by setting the flow rate of the solution and regulating the level of the solution in the tank. To construct a feedback control loop for level regulation, a level sensor that utilized an infrared distance sensor and an electric circuit for adjusting the ultrasonic oscillator were developed. The host program was also developed, which can monitor and control the sub-controllers. A proportional-integral controller was developed for a simplified model, and its operation was verified through an experiment.

• 센서학회지
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• 제22권4호
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• pp.292-296
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• 2013

The ultrasonic wind sensor that pass through the air, beating the delivery of ultrasonic wind speed increases or decreases by the physical characteristics of the wind speed and the direction of the sensor, the transmission and reception of ultrasonic time difference measured by a two-axis vector wind and wind speed measured by calculating a device that converts the digital signal is Anemometer and wind direction meteorological facilities management, management of the ship sail used for various purposes, including, but used the existing 3-cup (mechanical) anemometer wind rotor caused by mechanical wear parts replacement due to the short-term, the reliability of the product is low, parts replacement, and according to the characteristics caused the car, there is a problem in high maintenance costs. In addition, because the bearings use of the marine environment and the cryogenic environment was constrained. In this study, the excellent long-term reliability, using ultrasonic-type environment that is not constrained to produce wind anemometer located $90^{\circ}$ conformal road using four piezoelectric sensors were fabricated structures, the piezoelectric oscillator circuit produces a rash and receiving transmit and receive speeds the car through the two-axis vector calculation to measure wind velocity processor firmware programming, and its characteristics were tested.