• Title/Summary/Keyword: Virtual Storage

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A Four-Layer Robust Storage in Cloud using Privacy Preserving Technique with Reliable Computational Intelligence in Fog-Edge

  • Nirmala, E.;Muthurajkumar, S.
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.14 no.9
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    • pp.3870-3884
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    • 2020
  • The proposed framework of Four Layer Robust Storage in Cloud (FLRSC) architecture involves host server, local host and edge devices in addition to Virtual Machine Monitoring (VMM). The goal is to protect the privacy of stored data at edge devices. The computational intelligence (CI) part of our algorithm distributes blocks of data to three different layers by partially encoded and forwarded for decoding to the next layer using hash and greed Solomon algorithms. VMM monitoring uses snapshot algorithm to detect intrusion. The proposed system is compared with Tiang Wang method to validate efficiency of data transfer with security. Hence, security is proven against the indexed efficiency. It is an important study to integrate communication between local host software and nearer edge devices through different channels by verifying snapshot using lamport mechanism to ensure integrity and security at software level thereby reducing the latency. It also provides thorough knowledge and understanding about data communication at software level with VMM. The performance evaluation and feasibility study of security in FLRSC against three-layered approach is proven over 232 blocks of data with 98% accuracy. Practical implications and contributions to the growing knowledge base are highlighted along with directions for further research.

Data Security Technology for the Desktop Virtualization Environment using the Graphic Offloading (SW 분할 실행을 이용한 데스크탑 가상화 환경에서 데이터 보안 기술)

  • Chung, Moonyoung;Choi, Won-Hyuk;Jang, Su-Min;Yang, Kyung-Ah;Kim, Won-Young;Choi, Jihoon
    • KIISE Transactions on Computing Practices
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    • v.20 no.10
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    • pp.555-560
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    • 2014
  • This paper proposes the data security technology for the desktop virtualization environment using the separated software execution method. In the virtual environment where allocates separate VMs to the users, there is a benefit that the programs in one guest machine are isolated from the programs running in another guest machine, whereas in the separated execution environment that supports application virtualization, the isolation is not offered and it causes the data security problem because the applications are executed by the one root privilege in the server. To solve this problem, we provides the data security method using the server storage filter, the viewer filter, and the file mapping table in this paper.

A Study of File Replacement Policy in Data Grid Environments (데이터 그리드 환경에서 파일 교체 정책 연구)

  • Park, Hong-Jin
    • The KIPS Transactions:PartA
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    • v.13A no.6 s.103
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    • pp.511-516
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    • 2006
  • The data grid computing provides geographically distributed storage resources to solve computational problems with large-scale data. Unlike cache replacement policies in virtual memory or web-caching replacement, an optimal file replacement policy for data grids is the one of the important problems by the fact that file size is very large. The traditional file replacement policies such as LRU(Least Recently Used) LCB-K(Least Cost Beneficial based on K), EBR(Economic-based cache replacement), LVCT(Least Value-based on Caching Time) have the problem that they have to predict requests or need additional resources to file replacement. To solve theses problems, this paper propose SBR-k(Sized-based replacement-k) that replaces files based on file size. The results of the simulation show that the proposed policy performs better than traditional policies.

A Smartphone Swapping Policy that Considers the Characteristics of Applications and Memory Situations (앱의 특성과 메모리 상황을 고려하는 스마트폰 스와핑 정책)

  • Hyokyung Bahn;Jisun Kim
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.23 no.3
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    • pp.13-18
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    • 2023
  • As the number of mobile applications increases rapidly, the overhead of swapping in smartphone memory systems keeps increasing. Unlike desktop or server systems, the basic setting of smartphones does not support swapping, so applications are killed when available memory is exhausted. This is because swapping in smartphones incurs excessive storage I/O overhead. In this article, we propose a swapping policy for smartphones, which significantly reduces storage I/Os. The proposed policy categorizes mobile applications based on their functional characteristics, and controls the number of applications to be swapped based on application priorities and memory situations. Measurement experiments with Android reference devices show that the proposed swapping policy dramatically reduces the overhead of swapping in various mobile applications.

Performance Evaluation of Embedded Garbage Collectors in CVM Environment (CVM 환경에서 임베디드 가비지 컬렉터의 성능 평가)

  • Cha, Chang-Il;Kim, Sang-Wook;Chang, Ji-Woong
    • The KIPS Transactions:PartA
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    • v.14A no.3 s.107
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    • pp.173-184
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    • 2007
  • Garbage collection in the Java virtual machine is a core function that relieves application programmers of difficulties related to memory management. In this paper, we evaluate and analyze the performance of GenGC and GenRGC, garbage collectors for embedded Java virtual machines. For performance evaluation, we employ CVM, a real embedded Java virtual machine developed by Sun Microsystems, Inc., as a platform and also use a widely-used SpecJVM98 as a set of benchmark programs. To compare the performance of GenGC and GenRGC, we first evaluate the time of garbage collection and the delay time caused by garbage collection. Second, for more detailed performance analysis of GenRGC, we evaluate the time of garbage collection and the delay time caused by garbage collection while changing the sizes of a block and a frame. Third, we analyze the size of storage space required for performing GenRGC, and show GenRGC to be suitable for embedded environment with a limited mont of memory. Since CVM is the most representative one of embedded Java virtual machines, this performance study is quite meaningful in that we can predict the performance of garbage collectors in real application environments more accurately.

Performance Analysis of NVMe SSDs and Design of Direct Access Engine on Virtualized Environment (가상화 환경에서 NVMe SSD 성능 분석 및 직접 접근 엔진 개발)

  • Kim, Sewoog;Choi, Jongmoo
    • KIISE Transactions on Computing Practices
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    • v.24 no.3
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    • pp.129-137
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    • 2018
  • NVMe(Non-Volatile Memory Express) SSD(Solid State Drive) is a high-performance storage that makes use of flash memory as a storage cell, PCIe as an interface and NVMe as a protocol on the interface. It supports multiple I/O queues which makes it feasible to process parallel-I/Os on multi-core environments and to provide higher bandwidth than SATA SSDs. Hence, NVMe SSD is considered as a next generation-storage for data-center and cloud computing system. However, in the virtualization system, the performance of NVMe SSD is not fully utilized due to the bottleneck of the software I/O stack. Especially, when it uses I/O stack of the hypervisor or the host operating system like Xen and KVM, I/O performance degrades seriously due to doubled-I/O stack between host and virtual machine. In this paper, we propose a new I/O engine, called Direct-AIO (Direct-Asynchronous I/O) engine, that can access NVMe SSD directly for I/O performance improvements on QEMU emulator. We develop our proposed I/O engine and analyze I/O performance differences between the existed I/O engine and Direct-AIO engine.

A Study on the Retention Efficiency of Library Materials of Automated Storage and Retrieval System (자동서고의 자료 수장 효율성에 관한 연구)

  • Kim, Young-Seok
    • Journal of the Korean Society for Library and Information Science
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    • v.49 no.3
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    • pp.437-456
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    • 2015
  • This study aims to compare the retention efficiency of library materials of Automated Storage and Retrieval System(AS/RS) revealed by the literature review to other types of book stacks. Domestic and foreign academic libraries adopted AS/RS as part of a plan to improve the retention efficiency. Literature review reveals that in general, AS/RS is better in the retention efficiency in compare to other types of book stacks. This study compared the amount of library materials stored by the AS/RS of S University Library to the general book stack and the fixed-type and the mobile rack-type of virtual book stacks. The study reveals that AS/RS is up to 6 times more efficient than general book stacks, up to 3.61 times more efficient than fixed-type book stacks and up to 1.45 times more efficient than mobile rack-type book stacks. However, the study claims that the retention efficiency of library materials of AS/RS is lower than what is known.

An Empirical Analysis of Worldwide Cyberinfrastructure

  • Cho, Manhyung
    • Asian Journal of Innovation and Policy
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    • v.4 no.3
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    • pp.381-396
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    • 2015
  • Cyberinfrastructure is a research infrastructure that provides an environment in which research communities can get access to distributed resources and collaborate at unprecedented levels of computation, storage, and network capacity. The Worldwide LHC Computing Grid (WLCG) is a global collaborative project of computing or data centers that enables access to scientific data generated by the Large Hadron Collider (LHC) experiments at CERN. This case study analyzes the WLCG as a model of cyberinfrastructure in research collaboration. WLCG provides a useful case of how cyberinfrastructure can work in providing an infrastructure for collaborative researches under data-intensive paradigm. Cyberinfrastructure plays the critical role of facilitating collaboration of diverse and widely separated communities of researchers. Data-intensive science requires new strategies for research support and significant development of cyberinfrastructure. The sustainability of WLCG depends on the resources of partner organizations and virtual organizations at international levels, essential for research collaboration.

Design of UPnP-based Ubiquitous Virtual Storage (UPnP 기반 유비쿼터스 가상저장공간 설계)

  • Kang Bo-Young;Nam Young-Jin;Kim Sung-Ryeul;Seo Dae-Wha
    • Proceedings of the Korea Information Processing Society Conference
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    • 2006.05a
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    • pp.1191-1194
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    • 2006
  • 디지털 기술의 발전으로 다양한 컨버전스 제품들이 출시되고 있으며 컨텐츠의 디지털화가 가속화됨에 따라 대용량의 멀티미디어 데이터를 편리하게 분산 저장 관리 및 공유할 수 있는 기술 개발이 요구되고 있다. 본 논문에서는 이러한 요구 사항을 반영한UPnP를 이용한 유비쿼터스 가상저장공간에 대해 설계 및 구현한다. UPnP를 이용한 유비쿼터스 가상저장공간은 유비쿼터스 기술을 기반으로 정보가전기기 내에 존재하는 저장장치를 UPnP를 이용하여 하나의 큰 가상저장공간을 구축하고, 가상저장공간 내에 멀티미디어 파일을 힌트정보와 함께 저장함으로써 대용량의 멀티미디어 파일을 보다 지능적으로 탐색할 수 있는 기법을 제공한다.

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Design and Implementation of a Storage Wrapper based on the XML View (XML 뷰 기반의 자료 저장소 랩퍼 시스템의 설계 및 구현)

  • 박진수;최규원;정채영;김영균;이미영;강현석;배종민
    • Proceedings of the Korean Information Science Society Conference
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    • 2002.04b
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    • pp.163-165
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    • 2002
  • 데이터베이스 통합론 중에서 미디에이터 기반의 데이터베이스 통합 방법은 미디에이터가 가상적으로(Virtual)통합된 (intergrated) 뷰를 유지하도록 하고, 사용자가 통합된 뷰를 통해서 질의를 할 수 있도록 한다. 이를 위해 각 지역 데이터베이스와 직접 대화하는 자료저장소 랩퍼(wrapper)가 필요하다. 본 논문에서는 지역 데이터베이스의 내용을 W3C의 표준안인 XML Schema로 표현하고, 이를 바탕으로 사용자가 XML 뷰를 정의하는 방법을 제시한다. 그리고 이 사용자 정의 XML 뷰 기반의 스키마 관리기, 질의어 처리기, 연결 관리기로 구성된 랩퍼 시스템을 설계, 구현한다.

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