• 한국멀티미디어학회논문지
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• 제20권8호
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• pp.1357-1368
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• 2017

Sensor networks are used in various fields such as marine, defense, and smart home etc. Among the components of the sensor network, the sensor node collects sensor data, as one of the representative sensor network roles, and the sensor node makes a greate influence on the overall performance of the sensor network. Therefore, how to design the sensor node is an important issue in the sensor network field. However, the research on the sensor network architecture suitable for the sensor network installation environment has been made more important than the research on how to configure the sensor node. In this paper, we propose to identify elements to be considered for designing a sensor node that makes a large influence on the performance of the sensor network, and to easily implement the sensor node through the state transition model based on these elements.

• 대한기계학회논문집A
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• 제28권7호
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• pp.923-929
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• 2004

A magnetostrictive sensor is a sensor measuring elastic waves. Because of its unique non-contact measurement feature, the sensor receives more attentions in recent years. These sensors have been mainly used to measure longitudinal and torsional waves in ferromagnetic waveguides, but there increases an interest in using the sensor for flexural wave measurement. Since the performance of the sensor is strongly influenced by the applied bias magnetic field distribution, the design of the bias magnetic system providing the desired magnetic field is critical. The motivation of this investigation is to design a bias magnetic system consisting of electromagnets and yokes and the specific objective is to formulate the design problem as a bias yoke topology optimization. For the formulation, we employ linear magnetic behavior and examine the optimized results for electromagnets located at various locations. After completing the design optimization, we fabricate the prototype of the proposed bias magnetic system, and test its performance through flexural wave measurements.

• 대한전자공학회논문지
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• 제24권4호
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• pp.590-596
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• 1987

In this paper, it was studied on the design of a sun sensor which is able to sense the declinations of an azimuth angle and a zenith angle for a digital sun seeker control system so that it will seek the sun accurately. And, it was considered the construction of digital controllable algorithms through experiments. Peculiar design method of the sun sensor is that sensor box was constructed with three square silicon solar cells and that the three cells were mounted unsymmetrical forming the

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.291-295
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• 1996

This paper discusses several design factors of a capacitance displacement sensor with a numerical method and several experiments and describes guide lines of the design of this type sensor. We introduce the charge density method for the analysis of this type sensor, which has feasible accuracy and efficiency. The analysis of this type sensor with the charge density method agrees with displacement sensitivity experiments of a circular plate capacitance sensor with the sensor amp based In the charge transfer principle.

• 한국군사과학기술학회지
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• 제5권2호
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• pp.159-168
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• 2002

In this paper, a study on the design of the transmitter-receiver of fuze sensor for discriminating target position is presented. We propose the algorithm for detecting target distance/direction through investigating the operational concept and principle of fuze sensor. Based on the algorithm, We design transmitter-receiver, calculate various design variables and estimate the performance of that one. The estimated result shows that the required performance of fuze sensor is satisfied. Further research on confirming the performance of proposed algorithm through encounter simulation test with real target and resolving problem will be continued.

• 한국컴퓨터산업학회논문지
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• 제5권1호
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• pp.177-182
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• 2004

소나 센서부 설계 시 개별 센서에 대한 정합회로의 설계는 전체 가중회로의 특성에 매우 큰 영향을 미친다. 그러나 많은 경우 정합회로를 설계하는데 있어서 경험에 의한 수작업으로 수행하거나 매우 간단한 모델을 설정하여 그것을 바탕으로 설계하는 예가 많다. 다양한 센서에 대해서 유연하게 대응하는데 한계를 갖고 있고 또 많은 오류를 동반하기 때문에 정합회로 설계에 많은 시행착오를 초래한다. 본 연구에서는 다양한 센서에 유연하게 대응하는 정합회로 설계 도구를 구성하는 첫 단계로써 실제 소나 센서의 특성 측정 및 그를 바탕으로 한 소자 모델링을 일괄 작업화한 설계 프로그램을 구성하여, 그 구성과 기능에 대해서 설명하고자 한다.

• 전기전자학회논문지
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• 제26권3호
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• pp.510-514
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• 2022

본 논문에서는 고감도 보급형 방사선 측정센서 모듈 개발을 제안한다. 제안하는 측정센서 모듈은 섬광체+광증배소자(SiPM) 센서 최적화 구조설계, 센서 드라이버용 증폭과 필터 및 제어회로 설계, 근거리 통신을 포함한 제어회로 설계, 센서 기구설계 및 제작, 시제품에 적용되는 GUI 개발 등으로 구성된다. 섬광체+광증배소자(SiPM) 센서 최적화 구조 설계는 센서 구조 설계를 위한 섬광체와 광증배소자(SiPM)의 특성을 확인하여 설계한다. 센서 드라이버용 증폭과 필터 및 제어회로 설계는 SiPM을 이용하여 섬광체로 방사선에 의해 발생하는 미세 섬광신호를 처리하도록 설계한다. 근거리 통신을 포함한 제어회로 설계는 근거리 무선통신 기능을 지원하기 위한 MCU 설계 및 유선 통신 지원을 통해 데이터 전송이 가능하도록 설계를 수행한다. 센서 기구설계 및 제작은 플라스틱 섬광체에서 발생한 미세 섬광 신호를 광증배소자(SiPM)에 전달하기 위해 플라스틱 섬광체 외부에 반사지(미러링)를 감싸 발생한 섬광이 반사되어 효율을 높이도록 설계한다. 시제품에 적용되는 GUI 개발은 각 화면에 따라 상단에 날짜와 시간을 표현하며, 측정단위 및 시간, 초, 알람 레벨, 통신상태, 배터리 용량 등이 표현되도록 한다. 제안된 시스템의 성능을 평가하기 위하여 공인시험기관에서 실험한 결과는 방사선량 측정 범위가 30𝜇Sv/h ~ 10mSv/h로 측정되어서, 현재 국내외에서 상용으로 판매되는 제품들 중에서 최고수준 범위와 같은 결과가 산출되었다. 또한, ±7.4%의 측정 불확도가 측정되어서 국제 표준인 ±15% 이하에서 정상동작 됨이 확인되었다

• 센서학회지
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• 제25권2호
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• pp.110-115
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• 2016

This paper describes the design and fabrication of a three-axis force sensor with three parallel plate structures(PPSs) for measuring force in a finger force measuring system for a spherical object catch. The three-axis force sensor is composed of a Fx force sensor, Fy force sensor and a Fz force sensor, and the elements of Fx force sensor and Fy force sensor are a parallel plate structure(PPS) respectively and Fz force sensor is two PPS. The three-axis force sensor was designed using FEM(Finite Element Method), and manufactured using strain-gages. The characteristics test of the three-axis force sensor was carried out. As a test results, the interference error of the three-axis force sensor was less than 1.32%, the repeatability error of each sensor was less than 0.04%, and the non-linearity was less than 0.04%.

• 센서학회지
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• 제17권3호
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• pp.168-177
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• 2008

An indoor environmental monitoring system using IEEE 802.15.4 based wireless sensor network is proposed to monitor the amount of pollutant entering to the room from outside and also the amount of pollutant that is generated in indoor by the building materials itself or human activities. Small-size, low-power wireless sensor node and low power electrochemical sensor board is designed to measure the condition of indoor environment in buildings such as home, offices, commercial premises and schools. In this paper, two query models, the broadcasting query protocol and flooding query protocol, were designed and programmed as a query-based routing protocol in wireless sensor network for an environment monitoring system. The flooding query routing protocol in environment monitoring is very effective as a power saving routing protocol and reliable data transmission between sensor nodes.

• 제어로봇시스템학회논문지
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• 제17권3호
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• pp.218-222
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• 2011

This paper proposes a single-joint optical torque sensor with one body structure. Conventional optical torque sensors consist of three parts, two plates and an elastic structure. They have slightly slipping problem between plates and elastic structure due to the manufacturing tolerance. Since the order of measurement range of optical sensor is about ten micrometers, the slipping problem causes large measurement error, especially in the case of vibrational or high speed plant. This problem does not occur in the proposed design due to the one body structure. The proposed sensor has advantage of low cost, light weight, and small size. And it is easy to design and manufacture. Simulation works that analysis of stress and strain are performed accurately. To demonstrate the performance of proposed sensor, experiments were implemented to compare with a commercial force/torque sensor (ATI Mini45).