• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.251-254
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• 2006

마이크로 흐름센서는 종래의 반도체 집적회로 공정기술을 이용하여 소형으로 제작이 가능하며, 빠른 응답특성을 가지는 장점이 있어 다양한 응용이 기대되고 있다. 본 연구에서는 넓은 흐름의 세기영역에서 정밀한 감도를 가지는 2차원 마이크로 흐름센서를 실리콘 기판위에 설계하여 왔다. 이러한 흐름센서의 정확한 온도특성을 분석하고 이 결과로부터 최적을 온도 감지막 위치를 결정할 필요가 있다. 설계방법으로서 표계산 소프트웨어 Excel을 이용하여 열운송방정식의 차분 방정식을 매크로 기능을 이용하여 적용하고 워크시트 내에서 셀 참조방식을 활용하여 자동 계산을 수행하도록 구현하였다. 본 연구에서는 Excel을 활용한 효율적인 설계방법을 제시하고 하나의 히터와 양측에 한 쌍의 온도 감지막을 가진 마이크로 흐름센서에 대해서 열전달 특성을 계산하고 이로부터 최적을 온도 감지막 위치를 결정할 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.363-366
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• 2005

A micro flow sensor on silicon substrate allows the fabrication of small components where many different functions can be integrated so that the functionality of the sensors can be increased. Further more, due to the small size of the elements the sensors can be quite fast. A thermal mass flow sensor measures the asymmetry of temperature profile around the heater which is modulated by the fluid flow. In normal, a mass flow sensor is composed of a central heater and a pair of temperature sensing elements around the heater. A new 2-D wide range micro flow sensor structure with three pairs of temperature sensors and a central heater was proposed and numerically simulated by the Finite difference formulation to confirm the feasibility of the flow sensor structure.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.3
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• pp.595-600
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• 2005

A micro flow sensor on silicon substrate allows the fabrication of small components where many different functions can be integrated so that the functionality of the sensors can be increased. Further more, the small size of the elements these sensors can be quite fast. A thermal mass flow sensor measures the asymmetry of temperature profile around the heater which is modulated by the fluid flow. In normal, a mass flow sensor is composed of a central heater and a pair of temperature sensing elements around the heater A new 2-D wide range micro flow sensor structure with three pairs of temperature sensors and a central heater was proposed and numerically simulated by Finite Difference formulation to confirm the feasibility of the flow sensor structure in time domain.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.12
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• pp.2253-2258
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• 2008

To design micro flow sensor varying depending on temperature of driving heater in the detector of Oxide semiconductor, Markov chain MCM(MCMCM), which is a kind of stochastic and microscopic method, was introduced. The formulation for the thermal transfer equation based on the FDM to obtain the MCMCM solution was performed and investigated, in steady state case. MCMCM simulation was successfully applied, so that its application can be expanded to a three-dimensional model with inhomogeneous material and complicated boundary.

• Journal of the KSME
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• v.57 no.10
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• pp.48-52
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• 2017

이 글에서는 공간적으로 형상 제어된 나노구조물의 자기조립화(self-assembly)를 이용하여 고용량의 이온흐름이 가능한 나노전기수력학 기술에 대한 소개와 더불어, 이를 활용한 이온 다이오드, 고효율 마이크로 믹서, 이온농도차 발전 응용 및 향후 생체 내 이온검출 센서, 인체 삽입형 디바이스, 뇌-기계 인터페이스 연구에 대한 전망을 소개하고자 한다.

• Journal of Advanced Navigation Technology
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• v.14 no.6
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• pp.984-989
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• 2010

In this paper, parallel programming technique by using Java Thread is introduced so as to develop parallel design tool to analyze the small micro flow sensor. To estimate computing time for Thread-level parallelism, the performances of two experimental models for potential problem subject to Thermal transfer equation are examined. As a result, if the number of network PC is increase, computing time for parallelism on network environment is enhanced to be almost n times. The micro sensor design tool based on distributed computing can be utilized to analyze a large scale problem.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.1
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• pp.85-92
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• 2006

A new silicon micro flow sensor with multiple temperature sensing elements was proposed and fabricated in considering wide range flow velocity measuring device. Thermal mass flow sensor measures the asymmetry of temperature profile around the heater which is modulated by the fluid flow. A micro mass flow sensor was normally composed of a central heater and a pair of temperature sensing elements around it. A new 2-D wide range micro flow sensor structure with three pairs of temperature sensing elements and a central heater was proposed and numerically simulated by Finite Difference Formulation to confirm the feasibility of the wide flow range sensor structure. To confirm the simulation result, the new flow sensor was fabricated on silicon substrate and the basic flow sensing properties of the sensor were measured.

• Journal of Sensor Science and Technology
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• v.16 no.2
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• pp.115-119
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• 2007

We report electrokinetic streaming potential detection in a microchannel. Streaming potential, one of the representative electrokinetic phenomena, becomes noticeable either when the channel size reduces or when the concentration of electrolyte reduces. We suggest a triangular-shaped microchannel to enhance streaming potential. The triangular-shaped microchannel shows better performance than the straight one in terms of streaming potential. Couple of possible methods to enhance streaming potential is also discussed. Moreover, this type of channel and phenomenon can be applied to biological sensor application and energy transduction.

• Journal of Sensor Science and Technology
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• v.9 no.3
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• pp.190-195
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• 2000

The paper presents the constant temperature digital hot-film anemometer that measures easily a wind velocity at the indoor. The output is linearized using microprocessor and analog-to-digital converter, because the fourth root of the wind velocity is the output voltage of the sensor. The comparison result between fabricated and reference anemometer is less than ${\pm}2%$. In the range of air temperature of $23^{\circ}C{\sim}60^{\circ}C$, the error is about ${\pm}1%$ in wind velocity 10m/sec.

• Journal of Sensor Science and Technology
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• v.6 no.4
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• pp.307-315
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• 1997

In this paper, a sample chamber which provide easy replacement of ISFET sensor and consume only small sample volume for electrolyte analysis is designed and a 4-channel electrolyte analyzer employing 2-point calibration method is implemented. In addition, we proposed sample loading detection circuit for minimizing sample and calibration solutions and implemented it. Developed electrolyte analyzer consists of control system part and flow system part. For the effective control of the developed hardware, system software is developed as three individual routines ; measuring routine, calibration routine and washing routine.