• Journal of Biosystems Engineering
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• 제26권1호
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• pp.29-38
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• 2001

A navigation system was developed for autonomous guidance of a combine. It consisted of a DGPS, a machine vision system, a gyro sensor and an ultrasonic sensor. For an autonomous operation of the combine, target points were determined at first. Secondly, heading angle and offset were calculated by comparing current positions obtained from the DGPS with the target points. Thirdly, the fuzzy controller decided steering angle by the fuzzy inference that took 3 inputs of heading angle, offset and distance to the bank around the rice field. Finally, the hydraulic system was actuated for the combine steering. In the case of the misbehavior of the DGPS, the machine vision system found the desired travel path. In this way, the combine traveled straight paths to the traget point and then turned to the next target point. The gyro sensor was used to check the turning angle. The autonomous combine traveled within 31.11cm deviation(RMS) on the straight paths and harvested up to 96% of the whole rice field. The field experiments proved a possibility of autonomous harvesting. Improvement of the DGPS accuracy should be studied further by compensation variations of combines attitude due to unevenness of the rice field.

• 센서학회지
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• 제21권4호
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• pp.311-317
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• 2012

Disposable amperometric screen-printed biosensor strips have been fabricated by a sol-gel encapsulation for the analysis of glucose. The glucose oxidase(GOx) is entrapped in the gel matrix through sol-gel transition of tetraethoxysliane(TEOS). The biosensor is fabricated by GOx containing thin film of TEOS gel on the surface of screen-printed carbon electrode(SPCE). The GOx-containing thin film of TEOS gel offers a one-step modification process on the surface of SPCE. The optimum conditions for glucose determination have been characterized with respect to the applied potential, enzyme loading ratio, and pH. The linear range and detection limit of glucose detection were from 2.0 mM to 16.0 mM and 0.25 mM, respectively.

• 생물환경조절학회지
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• 제1권1호
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• pp.61-71
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• 1992

This study is performed to develop an automatic irrigation control of system for effective water management in greenhouse. The automatic irrigation control system is composed of an IR-RED optical sensor in tensiometer and an One-chip micro controller. The following results are obtained : 1. A practical IR-RED optical sensor in tensiometer, which shows the starting point of irrigation, was developed. 2. The automatic irrigation system with the optical sensor and One-chip micro controller was developed and also designed to be able to combine with the control system for temperature, curtain opening, etc. 3. A multiple irrigation control system for several greenhouses were suggested. 4. The results of the system test with the driving program for automatic water management were excellent.

• 반도체디스플레이기술학회지
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• 제18권4호
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• pp.129-133
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• 2019

In this paper, we developed a system to monitor the storage capacity of suction-type device such as vacuum cleaner or crop harvesters. The monitoring system consists of load cells and a differential pressure sensor which simultaneously monitor the weight and volume of the stock. Since weighing objects stored in storage containers alone cannot fully monitor the level of filling, more accurate monitoring can be achieved by monitoring volume and fusion with weight information. The volume was monitored using a phenomenon in which the flow rate of the inhaled air varies depending on the volume of the object filled in the storage container. In this paper, we developed a system to monitor the storage in three stages: low, medium and high.

• 센서학회지
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• 제21권4호
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• pp.270-275
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• 2012

In this study, we have developed a mobile-based visible/NIR(Near InfraRed) imaging equipment for the animal testing. This equipment can provide visible, NIR and merged image through the viewer program. Especially, merged image help researcher to understand visual messages at animal in-vivo test. Also, it is available to send real-time images through the smart phone. Researcher can communicate with another researcher who is a long distance away. Also, the equipment was made with portable small size to enable it to commercialize.

• 정보처리학회논문지A
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• 제17A권1호
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• pp.33-44
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• 2010

본 논문에서는 생체 모방 로봇을 이용한 관로 모니터링 시스템에 대하여 제안한다. 생체 모방 로봇은 관로를 이동하며 온도, 습도, 진동 등 다양한 정보를 획득한다. 관로를 이동하기 위하여 기본적으로 갖추어야 할 기능은 로봇이 이동하여야 할 관로의 형태를 인식하는 것이다. 관로의 형태 인식을 위한 센서로 적외선 거리 측정 센서를 사용하며, 모터에 연결된 센서는 회전 운동을 하며 측정된 각도 및 거리 정보 데이터를 이용하여 관로의 형태, 각도 등을 인식한다. 관로의 형태 인식은 모터에 의해 회전 운동하는 적외선 거리 측정 센서에 의해 감지되는 관로의 개수와 위치에 의한다. 한번 스캔된 데이터에서 감지되는 관로의 수에 따라 별도의 퍼지 분류기를 이용하여 형태 및 관로의 휘어진 각도 등을 추정하며, 다양한 형태의 관로에 대해 실제 측정된 데이터를 통하여 제안된 시스템이 효율적임을 확인한다.

• 한국콘텐츠학회논문지
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• 제10권4호
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• pp.98-105
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• 2010

사람들의 건강에 관련된 혈당, 혈압, 활동량 등을 생체 센서를 이용하여서 생체 정보를 획득하고, 건강상태를 모니터링하기 위한 시스템을 개발하기 위한 연구가 많이 되고 있다. 본 논문에서 생체 정보를 모니터링하여 분석하는 u-헬스 케어 에이전트 시스템을 개발하였다. 활동량 측정은 3축 가속도계 센서 기술을 이용한다. 3축 가속도 센서에서 획득되는 정보를 이용하여 활동량을 분석하여 정확한 활동량을 계산하는 알고리즘을 개발하였다. 기존 시스템들 보다 더 정확한 소모 칼로리를 계산하고, 이를 데이터베이스에 저장 관리한다. 또한 활동량과 생체 정보를 활용하여 건강 상태를 점검할 수 있다.

• 센서학회지
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• 제26권5호
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• pp.342-347
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• 2017

We present a precision instrument amplifier (IA) designed for bio-potential acquisition. The proposed IA employs a capacitively coupled instrument amplifier (CCIA) structure to achieve a rail-to-rail input common-mode range and low gain error. A positive feedback loop is applied to boost the input impedance. Also, DC servo loop (DSL) with pseudo resistors is adopted to suppress electrode offset for bio-potential sensing. The proposed amplifier was designed in a $0.18{\mu}m$ CMOS technology with 1.8V supply voltage. Simulation results show the integrated noise of $1.276{\mu}Vrms$ in a frequency range from 0.01 Hz to 1 KHz, 65dB SNR, 118dB CMRR, and $58M{\Omega}$ input impedance respectively. The total current of IA is $38{\mu}A$. It occupies $740{\mu}m$ by $1300{\mu}m$ including the passive on-chip low pass filter.

• 센서학회지
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• 제14권2호
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• pp.69-77
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• 2005

The electronic nose (e-nose) has been used in food industry and quality controls in plastic packaging. Recently it finds its applications in medical diagnosis, specifically on detection of diabetes, pulmonary or gastrointestinal problem, or infections by examining odors in the breath or tissues with its odor characterizing ability. Moreover, the use of portable e-nose enables the on-site measurements and analysis of vapors without extra gas-sampling units. This is expected to widen the application of the e-nose in various fields including point-of-care-test or e-health. In this study, a PDA-based portable e-nose was developed using micro-machined gas sensor array and miniaturized electronic interfaces. The rich capacities of the PDA in its computing power and various interfaces are expected to provide the rapid and application specific development of the diagnostic devices, and easy connection to other facilities through information technology (IT) infra. For performance verification of the developed portable e-nose system, Six different vapors were measured using the system. Seven different carbon-black polymer composites were used for the sensor array. The results showed the reproducibility of the measured data and the distinguishable patterns between the vapor species. Additionally, the application of two typical pattern recognition algorithms verified the possibility of the automatic vapor recognition from the portable measurements. These validated the portable e-nose based on PDA developed in this study.

• 한국콘텐츠학회논문지
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• 제5권6호
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• pp.230-237
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• 2005

본 연구에서 우슈 도장에서의 수련자 신체활동량을 과학적, 정량적으로 분석하여 스포츠의학의 중요한 관심사인 질병의 예방과 만성퇴행성 질환의 조절과 관리 그리고 건강을 증진할 수 있는 방안을 제안한다. 신체활동량을 측정하기 위해 신호획득 장비는 body media사에서 개발한 SenseWear PRO2 Armband를 사용하였다. Armband내에는 체온계(skin temperature sensor), 온도계(near-body temperature sensor), 가속도센서(accelerometer), 몸에서 발산되는 열량을 측정하는 센서(heat flux sensor), 피부의 전기전도도를 측정하는 센서(galvanic skin response sensor)가 있다. 각각의 센서로부터 획득한 데이터는 Armband내의 저장장치에 기록하였다. Armband에 저장된 데이터를 InnerView Wearer Software를 이용하여 우슈 도장에서 수련자의 신체활동에 따른 피부온도변화, 칼로리 소모, 활동량 추이변화를 분석하였다. 연구결과 지속적으로 오랜 기간 동안 운동을 한 사람은 단시간에 많은 에너지 소모를 하는 것으로 나타났으며 Physical activity가 활발하면 에너지 소모가 증가하고 동시에 피부 온도가 상승하는 것을 알 수 있었다. 에너지 소모가 증가하면서 피부온도가 증가하고 난 후 열 발산이 일어나는 것을 실험결과 알 수 있었다. 그리고 피부전도는 Physical activity, 에너지 소모, 피부온도 증가 등의 인자에 아무런 영향을 받지 않는 것으로 나타났다.