• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.54-54
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• 2003

• 전기의세계
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• v.41 no.2
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• pp.6-11
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• 1992

본고는 일본 Paress Journal사에서 간행된 <'90박막응용전자 디바이스) 지[1] 및 최근의 마이크로 센서 관련 보고[2-4]들을 토대로 박막형 마이크로 센서의 최신 관련기술 및 연구동향을 요약, 정리한 것이다.

• 전기의세계
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• v.28 no.6
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• pp.11-14
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• 1979

근년, 산업계에서 디지탈기술의 활용이 일반화하고 있었는데, 마이크로 컴퓨터의 등장으로 이경향이 한층 가속화하게 되었다. 마이크로컴퓨터가 가질수 있는 높은 성능과, 이에 대조적인 "소형"및 "염가" 때문에 사회일반에게 까지 크게 영향을 미칠것으로 생각되고 있다. 따라서 고급인력을 양성해 내는 대학은 지금 산업계로 부터 하나의 긴박한 요구를 받고 있다고 하겠으며, 이러한 시점에서 대학커리큘럼에 마이크로 컴퓨터에 관한 과목을 이미 도입한 경우를 살펴보고 우리의 현실에 대비하는 것은 중요한 일이라 생각된다.비하는 것은 중요한 일이라 생각된다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.36 no.6
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• pp.563-569
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• 2023

Micro light-emitting diodes (LEDs), with a chip size of 100 micrometers or less, have attracted significant attention in flexible displays, augmented reality/virtual reality (AR/VR), and bio-medical applications as next-generation light sources due to their outstanding electrical, optical, and mechanical performance. In the realm of bio-medical devices, it is crucial to transfer tiny micro LED chips onto desired flexible substrates with low precision errors, high speed, and high yield for practical applications on various parts of the human body, including someone's face and organs. This paper aims to introduce a fabrication process for flexible micro LED devices and propose micro LED transfer techniques for cosmetic and medical applications. Flexible micro LED technology holds promise for treating skin disorders, cancers, and neurological diseases.

• Journal of the Korean Society of Propulsion Engineers
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• v.11 no.6
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• pp.42-49
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• 2007

In this study, we analyzed flow characteristics of micro-nozzles for basic research to develop micro propulsion system. Cold gas propulsion system was used, and micro-nozzles having nozzle throat diameters of 1.0, 0.5, 0.25 mm were fabricated with EDM method. Thrust was measured through the use of plate-spring and strain gage based thrust measurement system, and flow characteristics of micro-nozzles were analyzed under ambient condition and vacuum condition. We used argon and nitrogen gases as propellant, and compared experimental results with CFD analysis. From the result, we verified the flow losses of viscosity and back-pressure caused by minimization of nozzle.

• Journal of the Korea Convergence Society
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• v.9 no.10
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• pp.237-242
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• 2018

A micromixer is a component of a lab-on-a-chip or microfluidic device that mixes two or more chemicals together(convergence). The purpose of this study is to assess the performance of passive micromixer of various shapes. Six shapes of micromixers were compared and three dimensional modeling was carried out to have the same hydraulic diameter. The commercial code, ANSYS Fluent, was used to simulate the internal mixing flow. A numerical analysis method is described in detail in this paper. The performance of the micromixer was compared with the mixing index and pressure drop. Consequently, the CDM-8T shape showed reasonable mixing performance and relatively low pressure drop.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.04a
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• pp.25-29
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• 2007

Minimization of conventional propulsion device has been studied for altitude control of micro satellite. We studied micro nozzle performance and found higher significant loss for a micro nozzle with smaller nozzle throat diameter. To overcome this loss, we proposed thermal transpiration based micro propulsion system. This new system has no moving parts and can control flow by temperature gradient, and this can be an option for potential new micro propulsion system.

• 전자공학회논문지 IE
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• v.44 no.1
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• pp.6-9
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• 2007

Twenty four types of thermopile for micro spectrometer infrared sensors were fabricated on low-stress Si3N4 membranes with $l.2{\mu}m-thickness$ using MEMS technology. Thermopile were designed and fabricated for optimum conditions by five parameters of thermocouple numbers $(16\sim48)$, thermocouple line widths $(10{\mu}m-25{\mu}m)$, thermocouple lengths $(100{\mu}m-500{\mu}m)$, membrane areas $(12mm2\sim2.52mm2)$ and junction areas $(150{\mu}m2\sim750{\mu}m2)$, respectively. It was thought that measurement results could be used for thermopile infrared sensors optimum structure for micro spectrometers.

• Information Display
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• v.23 no.3
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• pp.22-29
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• 2022

• Journal of Advanced Technology Convergence
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• v.1 no.1
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• pp.7-13
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• 2022

In this study, we prepared the functionalized Shampoo with three-type functionalized microcaples which were synthesized by microcapsulation, respectively. In detail, the functionalized microcapsule was included such as (1) the functionalized microcapsule with core-menthol and shell-melamine resin and (2) the functionalized microcapsule with core-menthol and shell-lecithin, and (3) the functionalized microcapsule with core-cinnamon oil and shell-lecithin, respectively. The size and morphology of the prepared microcapsules was evaluated via Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Dynamic Light Scattering (DLS). From these results, the prepared microcapsules with size of 0.1~0.2 ㎛ and spherical morphology was confirmed. Furthermore, we applied the prepared Shampoo to treat hair. As results we confirmed that the scalp temperature was decreased about 3~4 ℃ compared to no treatment. This result may be considered that the core compounds are vaporize when the functionalized Shampoo is treated on scalp. We will determine the change of scalp pore, diameter of hair, and etc during treatment of the functionalized Shampoo.