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김재후 ( Jae Hoo Kim ),임윤철 ( Yoon Chul Rhim ) 정보저장시스템학회 2015 정보저장시스템학회논문집 Vol.11 No.1
An archive system is designed to store data for a long time without loss. However, many important factors such as temperature, dust, vibration, and humidity must be considered to design a successful archive system. Read/write devices, for example optical disk drives(ODDs), in an archive system generate heat while they are in operation. Fans are usually used to remove heat but the air flow accompanies dust into the system result in system failure. In this study, an archive system with six ODDs is chosen as an analysis model and flow together with temperature distributions are computed using a CFD simulation package. Flow analysis is focused on four cooling fans at the rear panel and temperature distribution is studied for various cases of fan operation. From the temperature point of view, fans give significant effects on 4th to 6th ODDs compared to the 1st to 3rd ODDs. Also, it is noticed which fan is the most important as far as cooling is concerned.
김영식,장성수,이선영,진원혁,조일주,남효진,부종욱,Kim Young-Sik,Jang Seong-Soo,Lee Caroline Sun-Young,Jin Won-Hyeog,Cho Il-Joo,Nam Hyo-Jin,Bu Jong-Uk 정보저장시스템학회 2006 정보저장시스템학회논문집 Vol.2 No.2
In this research, a wafer-level transfer method of cantilever away on a conventional CMOS circuit has been developed for high density probe-based data storage. The transferred cantilevers were silicon nitride ($Si_3N_4$) cantilevers integrated with poly silicon heaters and piezoelectric sensors, called thermo-piezoelectric $Si_3N_4$ cantilevers. In this process, we did not use a SOI wafer but a conventional p-type wafer for the fabrication of the thermo-piezoelectric $Si_3N_4$ cantilever arrays. Furthermore, we have developed a very simple transfer process, requiring only one step of cantilever transfer process for the integration of the CMOS wafer and cantilevers. Using this process, we have fabricated a single thermo-piezoelectric $Si_3N_4$ cantilever, and recorded 65nm data bits on a PMMA film and confirmed a charge signal at 5nm of cantilever deflection. And we have successfully applied this method to transfer 34 by 34 thermo-piezoelectric $Si_3N_4$ cantilever arrays on a CMOS wafer. We obtained reading signals from one of the cantilevers.
비정질 실리콘 박막 태양전지 효율 향상을 위한 양극산화 알루미늄 템플레이트을 이용한 플라즈모닉 금 나노점 배열 최적화
배규영 ( Kyu Young Bae ),김경식 ( Kyoung Sik Kim ) 정보저장시스템학회 2013 정보저장시스템학회논문집 Vol.9 No.2
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.
열 보조 자기기록 시스템 헤드의 touch-down 과 take-off 해석
최종학 ( Jong Hak Choi ),김석환 ( Seok Hwan Kim ),김기훈 ( Ki Hoon Kim ),박영필 ( Young Pil Park ),박노철 ( No Cheol Park ),박경수 ( Kyoung Su Park ) 정보저장시스템학회 2012 정보저장시스템학회논문집 Vol.8 No.2
In HDD industry, many technologies have been developed and investigated as means to increase the areal density of drives. Especially, heat assisted magnetic recording (HAMR) system has been considered as the next generation storage device. Most of the HAMR systems use near field optics as heating mechanism. Therefore, light delivery system is indispensable. We considered the light delivery system with laser diode (LD) mount and optical fiber. Mass and stiffness of the HAMR system using these LD mount and optical fiber are changed. The mass and stiffness of the HAMR system affects the slider dynamic behavior. It is necessary to analyze touch down (TD) and take off (TO). And, we performed the TD-TO experiment with HAMR suspension. Finally, we analyzed the result of TD-TO experiments. And we suggested the design of HAMR suspension to improve TD-TO performance.
오주영 ( Ju Yeong Oh ),정영모 ( Young Mo Jung ),전성찬 ( Seong Chan Jun ) 정보저장시스템학회 2012 정보저장시스템학회논문집 Vol.8 No.2
Graphene oxide, which is exfoliated by oxidant from graphite, is the material for solving the problem of mass production and positioning. We made graphene oxide based devices by dielectrophoresis, studied and controlled factors which can affect the characteristic of graphene oxide channel. Graphene oxide channel assembled by dielectrophoresis can be constructed differently by various frequency options. We confirmed the change of gate characteristics and I-V characteristics in the range from 80K to 300K temperature.