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BEST: Best-effort energy saving techniques for NAND flash-based hybrid storage
Hyotaek Shim,Jin-Soo Kim,Seungryoul Maeng IEEE 2012 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS - Vol.58 No.3
<P>The NAND flash-based hybrid storage that consists of a hard disk and flash cache has been widely used in mobile PCs, such as laptop/desktop computers, that require large storage capacity, energy efficiency, and better performance. In particular, in such consumer devices, energy saving is a major concern under limited battery capacity. Although a disk can be spun down during idle time for energy saving, it has been observed that there are frequent read and write requests generated by background applications, even while there is no user activity. In the hybrid storage, the flash cache is used for reducing disk activities and prolonging disk spin-down time. During the spin-down time, write requests can be temporarily stored in the flash cache, whereas read requests should be carefully handled to avoid frequent disk spin-ups. This paper presents Best-effort Energy Saving Techniques (BEST) that make the best use of the hybrid storage to provide low energy consumption, even under many background applications. In addition, the proposed techniques ensure the lifetime of the hybrid storage by considering the limited block erase and load/unload cycles of the flash memory and hard disk, respectively. Evaluation results demonstrate that the proposed techniques achieve considerable energy saving under various workloads, compared with previous studies.</P>
System-Wide Cooperative Optimization for NAND Flash-Based Mobile Systems
Shim, Hyotaek,Kim, Jin-Soo,Maeng, Seungryoul IEEE 2014 IEEE Transactions on Computers Vol. No.
<P>NAND flash memory has become an essential storage medium for various mobile devices, but it has some idiosyncrasies, such as out-of-place updates and bulk erase operations, which impair the I/O performance of those devices. In particular, the random write performance is strongly influenced by the overhead of a Flash Translation Layer (FTL) that hides the idiosyncrasies of NAND flash memory. To reduce the FTL overhead, operating systems need to be adapted for FTL, but widely used mobile operating systems still mainly adopt algorithms designed for traditional hard disk drives. Although there have been recent studies on rearranging write patterns into a sequential form in the operating system, these approaches fail to produce sequential write patterns under complicated workloads, and FTL still suffers from significant garbage collection overhead. If the operating system can be made aware of the write patterns that FTL requires, the overhead can be alleviated even under random write workloads. In this paper, we propose a system-wide cooperative optimization scheme, where the operating system communicates with the underlying FTL and generates write patterns that FTL can exploit to reduce the overhead. The proposed scheme was implemented on a real mobile device, and the experimental results show that the proposed scheme constantly improves performance under diverse workloads.</P>
An Internet Based Data Storage Protocol for ATA devices
( Kulveer Singh ),( Hyotaek Lim ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1
This paper introduces a data storage transport protocol internet Advanced Technology Attachment (iATA) for ATA storage devices that can be accessed over (TCP/IP) networks. As the access speed of Advanced Technology Attachment (ATA) type storage is increasing, the importance of sharing the ATA type storages over internet is also increasing. We are proposing a protocol in which we have implemented the basic ATA command set to access the ATA type remote storage devices over the TCP/IP networks .In this paper, we give basic details of the protocol and discuss the existing storage protocols which are mainly used for accessing block storage like internet Small Computer System Interface (iSCSI) Hyper Small Computer System Interface (HyperSCSI) and ATA over Ethernet (AoE).
An Efficient Framework for Computation Offloading In Mobile Cloud Computing
Zhijun Zhang,HyoTaek Lim,Hoon Jae Lee 한국정보통신학회 2014 2016 INTERNATIONAL CONFERENCE Vol.6 No.1
With the emergence of mobile cloud computing (MCC), Mobile applications are becoming increasingly, there is a significant increase of mobile subscriptions, the drives need a strong demand for mobile cloud applications and services for mobile device users. However, mobile terminals are resource-constrained and therefore, running these applications directly on it is not satisfactory given a user’s expectations. This paper proposes a novel offloading service that can seamlessly offload some of the tasks of a mobile application from mobile terminals to cloud. Offloading computation to the cloud effectively expands the usability of mobile terminals beyond their physical limits, and also greatly extends their battery charging intervals through potential energy savings. The system architecture and key components of the proposed offloading service are presented, prototyped, and evaluated. The results of experiments and simulations have demonstrated the effectiveness and efficiency of this offloading service for mobile applications.
Voice Biometric Security on Multi Cloud Storage Using Deep Belief Network
Christofer Theodore,Hyotaek Lim 한국정보통신학회 2017 2016 INTERNATIONAL CONFERENCE Vol.9 No.1
Access Control is one of the most serious security factors in Cloud Computing. Leakage of one’s access control can lead attacker to be able to do anything with that access. Many research work has been done to improve the security in the access control. They add more security model such as token, biometric, phone number in addition to old username and password. However, to the best of our knowledge, there is still an improvement that can be done to improve the security, especially in biometric security. In this paper, we propose a solution that improves the voice biometric security method in addition to data splitting method from our previous work.