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Regeneration of Cellulose from Ionic Liquids
강완규,김기섭,Kang, Wan-Kyu,Kim, Ki-Sub Institute of Convergence Technology 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.2
Ionic liquids based on formate and hydrogen carbonate anions were synthesized for use as solvents for the effective dissolution of cellulose and the regenerated cellulose was in the native lattice.
A Microcatuator for High-Density Hard Disk Drive Using Skewed Electrode Arrays
최석문,박성준,Choi, Seok-Moon,Park, Sung-Jun Institute of Convergence Technology 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.2
This paper reports the design and fabrication of a micro-electro-mechanical-system(MEMS)-based electrostatic angular microactuator for a dual-stage servo. The proposed actuator employs a novel electrode pattern named "skewed electrode array(SEA)" scheme. It is shown that SEA has better linearity than a parallel plate type actuator and stronger force than a comb-drive based actuator. The moving and the fixed electrodes are arranged to make the driving force perpendicular to the rotating moment of arm. By changing the electrode overlap length, the magnitude of electrostatic force and stable displacement will be changed. In order to optimize the design, an electrostatic FE analysis was carried out and an empirical force model was established for SEA. A new assembly method which will allow the active electrodes to be located beneath the slider was developed. The active electrodes are connected by inner and outer rings lifted on the base substrate, and the inner and outer rings are connected to platform on which the slider locates. Electrostatic force between active electrodes and platform can be used for exiting out of plane modes, so this provides the possibility of the flying height control. A microactuator that can position the pico-slider over ${\pm}0.5{\mu}m$ using under 20 volts for a 2 kHz fine-tracking servo was designed and fabricated using SoG process.
Droplet Ejection and Experimental Study on the Application of Industrial Inkjet Printhead
박성준,Park, Sung-Jun Institute of Convergence Technology 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.1
In this paper, a hybrid design tool combining one-dimensional(1D) lumped model and three-dimensional computational fluid dynamics(CFD) approach has been developed in order to evaluate the performance of inkjet print head and droplet control process are studied to reduce the deviations between nozzles which affect the size of the printed line for the industrial application of direct writing on printed circuit boards(PCB). 1D lumped model analysis shows that it is useful tool for evaluating performance of an inkjet head by varying the design parameters. The differences in ejected volume and droplet velocity between analytical and experimental result are within 12%. Time sequence of droplet generation is verified by the comparison between 3D analysis result and photographic images acquired by stroboscopic technique. In addition, by applying DPN process, velocity and volume uniformity between nozzles is dramatically improved that the tolerance achieved by the piezoelectric inkjet printhead across the 64 nozzles is 5 to 8%. A printed line pattern is successfully obtained using the fabricated inkjet print head and droplet calibration system.
Skewed Electrode Array(SEA) and Its Application as an Angular Microactuator
최석문,박성준,Choi, Seok-Moon,Park, Sung-Jun Institute of Convergence Technology 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.2
The angular electrostatic microactuator using skewed electrode array (SEA) scheme was proposed. The moving and fixed electrodes are arranged to make the driving force perpendicular to the rotating moment of arm. By changing the electrode overlap length, the magnitude of electrostatic force and stable displacement will be changed. In order to optimize the design, electrostatic FE analysis were carried out and the empirical force model was established for SEA. Simulation was performed to make the comparison between conventional actuators and SEA. The proposed SEA generates actuating torque 2 times greater than a comb-drive and stable actuator displacement 40% greater than a parallel plate type actuator. The angular electrostatic microactuator using skewed SEA scheme was designed and fabricated using SoG process.
Semi-active Vibration Drug Delivery Device Design using a Micro-needle Fabrication and Array
성연욱,박진호,이혜진,Sung, Yeon-wook,Park, Jean Ho,Lee, Hye-Jin Institute of Convergence Technology 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.1
Transdermal drug delivery device is a method of drug delivery through the skin. Skin has a very large area, so it is attractive route to drug delivery. When drug delivery through the skin, microneedle has a advantage that painless, constant drug deliver and penetration efficient; nevertheless the cost is expensive because fabrication process need a particular equipment and not suitable in mass production. This study shows microneedle fabrication process using convergence of general MEMS process and dicing process that can make 3-D sharp microneedle tip and this fabrication process suitable for mass production.