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음파 전달 현상을 이용한 마이크로 점도계의 설계와 제작
최성준(Sungjoon Choi),문원규(Wonkyu Moon),임근배(Geunbae Lim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The development of nano/biotechnology brings about the needs for the comprehension of the characteristics of organic matters (bio-cell and its system) and the miniaturization of diagnostic equipments. To investigate the characteristics of organic matters, a new method sensing viscosity and its variation is proposed. Existing mechanical viscometers have some applicative problems which are the need for much liquid and the probability of condition changes of organic matters during the measurement of viscosity. So, to satisfy these needs and to solve problems, a novel device, which is fabricated by MEMS (Micro-Electric Mechanical System) technique and used to measure viscosity and its variation of organic matters or other fluids, is proposed. It is composed of two chambers and a micro-channel with which connect each chamber. In other words, it is double Helmholtz resonator. In this paper, design and fabrication method of the proposed device is described.
구조적 형상 제어를 통한 인장에 내성을 가지는 전극 개발
양성진 ( Seongjin Yang ),홍성경 ( Seong Kyung Hong ),임근배 ( Geunbae Lim ) 한국센서학회 2021 센서학회지 Vol.30 No.3
Interest in healthcare and wearable devices has been increasing recently. A strain sensor is required in various wearable devices. With respect to such devices, studies on resistance changes in strain sensors using flexible materials are in progress. However, the resistance of the rest area in a strain sensor should not change according to the applied strain. So, an electrode with resistance to stretching, bending, and torsion is required in such strain sensors. Tension, bending, and torsion can be realized through structural shape control, rather than by using flexible materials. Further, such an electrode that maintains electrical properties has been developed and manufactured. This electrode can be used in various applications such as foldable devices, e-papers, batteries, and multifunctional wearable devices.
Simple fabrication method of the unique micro/nano structures using synchrotron X-ray
Kanghyun Kim(김강현),Kyungjin Park(박경진),Geunbae Lim(임근배),Jong Hyun Kim(김종현) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Micro- and nanofluidic devices are being used increasingly in biological, chemical, and medical applications, and many fabrication methods have been proposed. Using the fabricated nanochannels, the generation of ion concentration polarization, a novel transport phenomenon in nanofluidics, was investigated. Our novel fabrication method should be a useful tool for various nanofluidic applications due to its various advantages, including simple fabrication process, controllability, and duplicability. Conventional micro fabrication techniques have been improved to overcome their limitations by developing various methods with a three-dimensional structure. Three dimensional structure or various patterns in shape have been realized, but the process is slightly complicated and the efficiency is low. Nowadays, more efficient and simple fabrication methods are required for the application of various micro-structure based components/devices and systems. In this study, we developed novel fabrication technique to fabricate various tilted micro-structures with a different angle on single substrate using a synchrotron X-ray lithography. Here, we have shown the unique fabrication technique which is based on synchrotron x-ray irradiation and curved/flexible x-ray mask/substrate. Tilted microstructure can have various angles and directions in single substrate.
Poly-dimethylsiloxane (PDMS) 기판 위에 형성된 나노구조를 이용한 시각 인장센서의 개발
김건휘 ( Geon Hwee Kim ),우현수 ( Hyeonsu Woo ),임근배 ( Geunbae Lim ),안태창 ( Taechang An ) 한국센서학회 2018 센서학회지 Vol.27 No.6
Structural color has many advantages over pigment based color. In recent years, researches are being conducted to apply these advantages to applications such as wearable devices. In this study, strain sensor, a kind of wearable device, was developed using structural color. The use of structural color has the advantage of not using energy and complex measuring equipment to measure strain rate. Wrinkle structure was fabricated on the surface of Poly-dimethylsiloxane (PDMS) and used it as a sensor which color changes according to the applied strain. In addition, a transmittance-changing sensor was developed and fabricated by synthesizing additional glass nanoparticles. Furthermore, a strain sensor was developed that is largely transparent at the target strain and opaque otherwise.