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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Society of Information Storage Systems
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The Society of Information Storage Systems
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Volume 9, Issue 2 - Sep 2013
Volume 9, Issue 1 - Mar 2013
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A study on dynamic behavior of inner parts with non-operational shock in hard disk drive
Choi, Yong-Ho ; Choi, Jonghak ; Lim, Gun-Yeop ; Seo, Junho ; Park, No-Cheol ;
Transactions of the Society of Information Storage Systems, volume 9, issue 2, 2013, Pages 32~35
DOI : 10.9797/TSISS.2013.9.2.32
Nowadays, function related to anti-vibration and anti-shock of storage devices is required because of portability. Therefore, many hard disk drive (HDD) studies about external shock and vibration have been performed. Especially, many studies are performed with non-operational shock. Most studies have used the fixed condition between spindle system and base when they wanted to analyze dynamic behavior of inner parts in simulation. But spindle system has actually stiffness and damping coefficient. Maybe difference of value would be happened between fixed condition and spring condition. So, we measured FRF of spindle system to know stiffness and damping coefficient in HDD. And we studied on dynamic behavior of inner parts by using calculated stiffness and damping coefficient. As a result, we confirmed the difference as boundary condition of spindle system.
Study on frictional behavior of carbon nanotube with respect to potential function by molecular dynamics simulation
Kim, Hyun-Joon ; Kim, Dae-Eun ;
Transactions of the Society of Information Storage Systems, volume 9, issue 2, 2013, Pages 36~41
DOI : 10.9797/TSISS.2013.9.2.36
Frictional behavior of a single carbon nanotube(CNT) was investigated using molecular dynamics simulation. A single CNT aligned horizontally on silver or graphene substrate was modeled to evaluate its frictional behavior such as frictional force and rolling/sliding motion with respect to potential parameter and lattice structure of the substrate. As a result, it was found that friction and rolling was affected by adhesion between two surfaces and period of the rolling depended on lattice distance of the substrate.
Performance and Stability Enhancement of Organic Solar Cells by Surface Treatment Processes of Transparent Electrodes
Lee, Kwan-Yong ; Kim, Do-Hyun ; Park, Sun-Joo ; Kim, Young-Joo ;
Transactions of the Society of Information Storage Systems, volume 9, issue 2, 2013, Pages 42~47
DOI : 10.9797/TSISS.2013.9.2.42
In this study, we have experimentally analyzed how the surface properties of transparent electrode layer influence the photovoltaic performance of bulk heterojunction organic solar cell by the contact angle measurement and X-ray photoelectron spectroscopy(XPS) observation. As a result, the power conversion efficiency of test devices improved from 0.64% to 1.83% and 2.15% by UV-ozone exposure and
plasma treatment, respectively. Thus, we conclude that the surface activation process is very important for better performance and stability in addition to the cleaning process of carbonate residue on the surface.
A tunable inverse-hemisphere-shaped Bragg grating sensor
Ryu, Yunha ; Kim, Kyoungsik ;
Transactions of the Society of Information Storage Systems, volume 9, issue 2, 2013, Pages 48~50
DOI : 10.9797/TSISS.2013.9.2.48
In this work, we investigated the diffraction of inverse-hemisphere shaped polymer grating. The grating was fabricated by using soft lithography of hexagonally close-packed PS nanospheres. The periodicity of the grating was tuned by swelling in acetone and the diffraction wavelength shift induced from lattice change was measured. This device can be used as a strain gauge or a chemical sensor.
Analysis of dynamic characteristic applying frame on stamped base in 2.5 inch hard disk drive
Lim, Geonyup ; Park, No-Cheol ; Park, Kyoung-Su ; Kim, Seokhwan ;
Transactions of the Society of Information Storage Systems, volume 9, issue 2, 2013, Pages 51~55
DOI : 10.9797/TSISS.2013.9.2.51
HDD has been easily exposed to the external shock and vibration because HDD has to apply to mobile devices. Therefore, the stiffness of base has been the important factors for the design of HDD. To improve the stiffness of base, the frame was applied to the base. First, the finite element model of the base was constructed. Then, the FE model was verified by modal analysis. Drop test was performed to confirming the shock simulation model. The dynamic characteristic of original base which is verified is compared with the base which is applied the frame through modal analysis and shock analysis.
Shock Resistance Characteristic of Auto Focus Actuator using Finite Element Method and Drop Impact Test
Shin, Min-Ho ; Kim, Hyo-Jun ; Park, Gyusub ; Kim, Young-Joo ;
Transactions of the Society of Information Storage Systems, volume 9, issue 2, 2013, Pages 56~61
DOI : 10.9797/TSISS.2013.9.2.56
The recent increased use of mobile phone has resulted in a technical focusing on reliability issues related to drop performance. Since mobile phone may be dropped several times during their use, it is required to survive common drop accidents. The plastic injection parts such as base stopper and carrier in the encoder type actuator can be broken easily in the actual reliability test of 1.5m free drop. So, we analyzed the shock resistance characteristics of auto focus actuator with variables in the material properties using finite element method. By applying the new resin materials, we can decrease the breakage of plastic injection parts and improve the reliability of mobile phone.
Optimized Design of HDD Stamped Base to Increase Stiffness
Yoon, Joo-Young ; Lim, Geonyup ; Kim, Seokhwan ; Park, Young-Pil ; Park, No-Cheol ; Park, Kyoung-Su ;
Transactions of the Society of Information Storage Systems, volume 9, issue 2, 2013, Pages 62~66
DOI : 10.9797/TSISS.2013.9.2.62
For the production method, stamp base is increasing the market share. But also, by the manufacturing method, stiffness of the stamp base is small. Many studies have been carried out in order to increase the stiffness of the stamp base. In this study, we optimally designed according to the position of bolting using a screening method in order to increase the stiffness base. After establishing a simulation model, the maximum deformation and frequency of the first mode based having relevance with stiffness of the base, were optimized. There for, it was possible to expect of increasing the stiffness of the stamp base.
Plasmonic gold nanodot array optimization on a-Si thin film solar cells using anodic aluminum oxide templates
Bae, Kyuyoung ; Kim, Kyoungsik ;
Transactions of the Society of Information Storage Systems, volume 9, issue 2, 2013, Pages 67~71
DOI : 10.9797/TSISS.2013.9.2.67
The fabrication method of plasmonic nanodots on silicon substrate has been developed to improve the efficiency of thin film solar cells. Nanoscale metallic nanodots arrays are fabricated by anodic aluminum oxide (AAO) template mask which can have different structural parameters by varying anodization conditions. In this paper, the structural parameters of gold nanodots, which can be controlled by the diverse structures of AAO template mask, are investigated to enhance the optical properties of a-Si thin film solar cells. It is found that optical properties of the thin film solar cells are improved by finding optimization values of the structural parameters of the gold nanodot array.