• 과학교육연구지
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• 제40권3호
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• pp.254-266
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• 2016

이 연구에서는 2007 개정 및 2009 개정 중등 과학 교과서 및 화학 교과서를 중심으로 교과서에 수록된 MBL(microcomputer-based laboratory) 실험을 교육과정 시기, 대상 학년, 실험이 제시된 맥락, 내용 영역, 주제, 사용된 센서, 그리고 출판사 등의 측면에서 분류하고 그 특징을 분석하였다. 분석 결과, MBL 실험은 2007 개정 교육과정기의 경우에는 중학교 과학 교과서에서만 25번 제시되었고, 2009 개정 교육과정기의 경우에는 과학 및 화학 I, II 교과서를 통틀어 29회(중학교 19회, 고등학교 10회) 제시되었다. 전체적으로는 교육과정 개정 이후 중학교 과학 교과서에 MBL 실험은 증가하지 않은 반면, 고등학교 교과서에는 처음으로 제시되었다. MBL 실험은 중학교 1학년에 가장 많이 제시되었고, 선택탐구보다는 필수탐구에 주로 포함 되었다. 센서 중에서는 운동 센서와 온도 센서가 가장 많이 사용되었고, 그 다음으로는 산소와 이산화탄소 센서가 많이 사용되었다. 출판사별 분석에서는 전체적으로는 사용 빈도가 감소하였고, 일부 출판사의 교과서에서는 MBL 실험이 단 한번도 사용되지 않았다. 이 결과들을 바탕으로 교육적 함의를 논의하였다.

• 센서학회지
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• 제25권2호
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• pp.148-154
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• 2016

This paper describes the design and fabrication of a two-axis force/torque sensor and an one-axis force sensor with parallel plate beams(PPSs) for measuring forces and torque in an ankle rehabilitation exercise using by a lower rehabilitation robot. The two-axis force/torque sensor is composed of a Fy force sensor and Tz torque sensor and the force sensor detects x direction force. The two-axis force/torque sensor and one-axis force sensor were designed using by FEM(Finite Element Method), and manufactured using strain-gages. The characteristics experiment of the two-axis force/torque sensor and one-axis force sensor were carried out respectively. As a test results, the interference error of the two-axis force/torque sensor was less than 1.56%, the repeatability error and the non-linearity of the two-axis force/torque sensor were less than 0.03% respectively, and the repeatability error and the non-linearity of the one-axis force sensor were less than 0.03% and 0.02% respectively.

• 제어로봇시스템학회논문지
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• 제17권6호
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• pp.546-551
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• 2011

Tilt sensor is required to control the attitude of the biped robot when it walks on an uneven terrain. Vision sensor, which is used for recognizing human or detecting obstacles, can be used as a tilt angle sensor by comparing current image and reference image. However, vision sensor alone has a lot of technological limitations to control biped robot such as low sampling frequency and estimation time delay. In order to verify limitations of vision sensor, experimental setup of an inverted pendulum, which represents pitch motion of the walking or running robot, is used and it is proved that only vision sensor cannot control an inverted pendulum mainly because of the time delay. In this paper, to overcome limitations of vision sensor, Kalman filter for the multi-rate sensor fusion algorithm is applied with low-quality gyro sensor. It solves limitations of the vision sensor as well as eliminates drift of gyro sensor. Through the experiment of an inverted pendulum control, it is found that the tilt estimation performance of fusion sensor is greatly improved enough to control the attitude of an inverted pendulum.

• 센서학회지
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• 제20권5호
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• pp.322-328
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• 2011

There are many ways to detect the heart rate non-invasively such as ECG, PPG, strain gauge, and pressure sensor. In this paper, the pulse wave measurement system using bipolar biased head on mode of the Hall sensor is proposed for measuring the radial artery pulse. TMS320F2812 was used to implement the proposed system and a portable wireless network(zig-bee) was used to show the experimental result. It was confirmed from experiment that the performance of the implemented system was more stable and faster than PPG sensor or piezoelectric film pressure sensor.

• 한국공작기계학회논문집
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• 제10권4호
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• pp.111-117
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• 2001

In this paper, we will propose the new method that estimates the sensing ability of smart sensor. A study is estimation method that evaluates the sensing ability about smart sensor respectively. According to acceleration(g) and displacement changing, we estimated the sensing ability of smart sensor using the SAI(Sensing Ability Index) method respectively. We made the smart sensors in our experiment. The types of smart sensor are three types(H1, H1, H3 smart sensor). The smart sensors were developed for recognition of materials. Experiments and analysis were executed to estimated the sensing abili-ty of smarty sensor. Dynamic characteristics of smart sensors(acceleration changing) were evaluated respectively through a new method(SAI) that uses the power spectrum density.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.318-322
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• 2001

This paper deals with sensing ability of smart sensor that has a sensing ability to distinguish materials according to surface types of smart sensor. We have developed a new signal processing method that can distinguish among different materials. The smart sensor was developed for recognition of materials. We made two types of smart sensors in our experiment. Then, we estimated the ability to recognize objects according to smart sensor type. We estimated the sensing ability of smart sensor with the $R_{SAI}$ method. Experiments and analysis were executed to estimate the ability to recognize objects according to surface types of smart sensor. Sensing ability of smart sensors was evaluated relatively through a new $R_{SAI}$ method. Applications of smart sensors are for finding abnormal conditions of objects (auto-manufacturing), feeling of objects (medical product), robotics, safety diagnosis of structure, etc.etc.

• 재활복지공학회논문지
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• 제11권2호
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• pp.133-141
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• 2017

하이브리드 음향센서 (hybrid acoustic sensor)는 음압 기반의 음향센서 (ECM)와 진동 기반의 가속도 센서(acceleration sensor)가 접목된 구조이다. 이는 음향센서의 저주파 대역 감도와 가속도 센서의 고주파 대역 감도를 결합하여 저주파에서 고주파 대역까지 광범위하게 음향을 포집할 수 있다. 본 논문에서는 하이브리드 음향센서에 사용되는 가속도 센서를 제안하였다. 가속도 센서는 음향신호에 의해 발생되는 고막의 진동을 포집한다. 제안된 가속도 센서의 사이즈는 고막의 해부학적 구조와 음향센서인 ECM의 규격을 고려하여 직경 3.2 mm로 결정하였다. 그리고 하이브리드 음향센서가 고감도 광대역 특성을 가지도록 하기 위해서는 가속도 센서의 공진 주파수는 3.5 kHz 부근에서 생성되는 것을 목표로 하였다. 가속도 센서를 구성하는 진동막은 수학적 모델과 유한요소 해석을 통하여 기하학적 구조를 도출하였다. 이를 바탕으로 화학적 식각공정을 이용하여 진동막을 제작하였다. 그리고 제작된 진동막의 주파수 특성을 확인하기 위하여 외력에 의한 진동 측정 실험을 수행하였고, 실험 결과 진동막의 기계적 공진은 3.4 kHz에서 발생되었다. 그러므로 제안한 가속도 센서는 하이브리드 음향센서에 유용하게 활용될 수 있을 것으로 판단된다.

• 센서학회지
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• 제22권1호
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• pp.54-64
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• 2013

In this study, we developed a falling recognition system to transmit SMS data through CDMA communication using a three axises acceleration sensor and a two axises gyro sensor. 5 healthy men were selected into a control group, and the fall recognition system using the three axises acceleration sensor and the two axises gyro sensor was devised to conduct an experiment. The system was attached to the upper of their sternum. According to the experiment protocol, the experiment was carried out 3 times repeatedly divided into 3 specific protocols: falling during gait, falling in stopped state, and falling in everyday life. Data obtained in the falling recognition system and LabVIEW 8.5 were used to decide if falling corresponds to that regulated in an analysis program applying an algorithm proposed in this study. In addition, results from falling recognition were transmitted to designated cellular phone in a SMS (Shot Message Service) form. These research results show that an erroneous detection rate of falling reached 19% in applying an acceleration signal only; 6% in applying an angular velocity; and 2% in applying a proposed algorithm. Such finding suggests that an erroneous detection rate of falling is improved when the proposed algorithm is applied incorporated with acceleration and angular velocity. In this study therefore, we proposed that a falling recognition system implemented in this study can make a contribution to the recognition of falling of the aged or the disabled.

• 센서학회지
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• 제26권5호
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• pp.353-359
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• 2017

This paper describes the design and manufacture of a ankle two-axis force sensor of a walking assist robot for hemiplegic leg patient. The walking assist robot for the hemiplegic leg patient can safely control the robot by detecting whether the foot wearing the walking assist robot is in contact with the obstacle or not. To do so, a two-axis force sensor should be attached to the robot's ankle. The sensor is used to measure the force of a patient's ankle lower part. The two-axis force sensor is composed of a Fx force sensor, a Fy force sensor and a pulley, and they detect the x and y direction forces, respectively. The two-axis force sensor was designed using by FEM(Finite Element Method), and manufactured using by strain-gages. The characteristics experiment of the two-axis force sensor was carried out respectively. The test results indicated that the interference error of the two-axis force sensor was less than 1.2%, the repeatability error and the non-linearity of the two-axis force sensor was less than 0.04% respectively. Therefore, the fabricated two-axis force sensor can be used to measure the force of ankle lower part in the walking assist robot.

• 한국융합학회논문지
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• 제9권4호
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• pp.137-142
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• 2018

본 연구는 송 수신 초음파 센서를 이용하여 CNG 탱크에서의 정밀한 연료량을 측정하기 위한 기초 연구로써 탱크내부 압력 및 초음파 센서의 접촉면 변경에 따른 수신감도를 분석하였다. 실험은 탱크와 센서의 접촉면을 점, 선, 면의 3가지 타입으로 변경하고 탱크 내부의 압력을 0 bar 부터 5 bar까지 1 bar 간격으로 충전하면서 측정을 진행하였다. 실험결과 탱크내부의 압력이 증가함에 따라 초음파 센서의 수신신호 값이 감소하는 경향을 확인할 수 있었다. 또한 탱크와 센서의 접촉면적이 증가할수록 수신 신호 값은 증가하지만, 노이즈 또한 증가하는 것을 확인 할 수 있었다. 이와 같은 실험 결과 초음파의 투과 특성을 이용하여 탱크내부의 기체 연료량을 측정할 수 있을 것으로 판단되며, 센서의 접촉면 변경을 통해 정밀성을 향상시킬 수 있을 것으로 판단된다.