MIDS／BUAA存储管理子系统的设计

存储管理（特别是辅存管理）是任何一个数据库系统的物理实现层，持久性若不最终落实到辅存上，就是一句空话．本文首先讨论了将程序设计语言和持久对象进行集成的３种途径；然后介绍了ＭＩＤＳ存储管理子系统ＳＭＳ（ＳｔｏｒａｇｅＭａｎａｇｅｍｅｎｔＳｕｂｓｙｓｔｅｍ）的设计：（１）ＳＭＳ的体系结构，（２）ＭＩＤＳ对象的存储结构，（３）对象标识的设计，（４）簇聚与索引，（５）持久性的实现，（６）动态地址转换．     

DOS存储管理系统的不足及改进

本文首先阐述了ＤＯＳ存储管理机制及其不足，然后对其不足之处提出了改进方法，使得其存储管理更为有效，并对１ＭＢ以上内存提供了透明性访问。     

多媒体MIS对MDBMS的功能需求及OODBMS对多媒体MIS的支持

面向对象的多媒体数据库系统（ＯＯＤＢＭＳ）为多媒体管理信息系统（ＭＭＩＳ）的开发与应用奠定了坚实的基础。本文阐述了ＭＭＩＳ的主要特征和构成；并讨论了ＭＭＩＳ对ＭＤＢＳ的功能需求的三个方面中后两个方面即数据模型方面及多媒体对象共享和操作方面的需求；最后讨论了ＯＯＤＢＭＳ支持ＭＭＩＳ中的几个问题。     

MIDS／BUAA的模式管理器与对象管理器的设计

本文首先回顾了ＭＩＤＳ／ＢＵＡＡ总体设计中相关的部分重要内容，ｕｎｉｖＯｂｊｅｃｔ对象定义，持久性规则、库模式和ＭＩＤＳ的功能构成等。然后重点介绍了ＭＩＤＳ／ＢＵＡＡ中两个核心模块；模式管理器ＳＭ和对象管理器ＯＭ的思想，基本任务和实现途径；最后给出了ＭＩＤＳ／ＢＵＡＡ类库的层次结构。     

MS DOS 6.0—一个用户版的操作系统

该文介绍了ＭＯＳ ＤＯＳ ６．０版从用户角度出发在ＭＳ ＤＯＳ ５．０基础上所作的改进，对其在存储管理方面的改善及自动配置功能模块ＭｅｍＭａｋｅｒ、实时压缩模块ＤｏｕｂｌｅＳｐａｃｅ、实用驱动程序和多配置、交互式引导特征等作了较为详细的介绍，并对ＭＳ ＤＯＳ ６．０特意为便携式计算机新增加的一些功能和在ＭＳ ＤＯＳ ５．０基础上添加的一些命令作了简要说明。     

一个层次-关系模型的多媒体DBMS的设计与实现

该文介绍了一种基于层次－关系模型的多用户多媒体数据库管理系统的存储管理方式及其客户／服务器模型。我们扩充了用于描述多媒体图象、声音及Ｍｉｄｉ音乐的数据类型－Ｍ类型及ＳＱＬ语言对Ｍ类型数据的操作。     

复杂景观模拟的原型系统

该文对复杂景观模拟的原型系统ＭＤＳ进行了领域分析，以面向对象的系统分析方法确定了系统的对象及其相关操作，并描述了系统模型的建立过程；最后介绍了ＭＤＳ系统的概貌。     

提高ORACLE数据库系统运行性能的若干技术

本文根据数据库维护经验，详细地分析了提高ＯＲＡＣＬＥ数据库系统运行性能的技术及其实现方法，重点讨论了存储管理的优化以及ＯＲＡＣＬＥ ＲＤＢＭＳ的调谐技术。     

一种从问题域导出对象的方法

需求分析在ＭＩＳ开发过程中占有重要的地位。本文首先比较了当前三种需求分析方法，然后，提出了一种适合于ＭＩＳ的问题域导出对象的方法，并定义了其转换步骤。     

支持进化系统WCAIS的存储实现

本文讨论进化系统ＷＣＡＩＳ的存储实现，其采用对象目录表和对象空间分配表对对象库文件空间实施动态重构，较好地解决了变长数据，方法代码等的存储管理，以有效地支持自身的进化演变。     

多媒体数据模型与存储模型研究

建立多媒体数据库首先应从多媒体数据的特点出发，把多媒体信息中的各种复杂关系以形式化的方法在数据模型的层次上表现出来。对于多媒体系统来说，多媒体数据的存储与组织问题显得非常重要。文中对多媒体数据模型和存储模型进行了讨论。     

Multimedia object modeling and storage allocation strategies

The improvements in disk speeds have not kept up with improvements in processor and memory speeds. Many techniques have been proposed and utilized to maximize the bandwidths of storage devices. These techniques have proven useful for conventional data, but when applied to multimedia data, they tend to be insufficient or inefficient due to the diversified data types, bandwidth requirements, file sizes and structures of complex objects of multimedia data. In this paper, we discuss the design of an efficient multimedia object allocation strategy that strives to achieve the expected retrieval rates and I/O computational requirements of objects; and also effectively balances the loads on the storage devices. We define a multimedia object model, describe the multimedia object and storage device characteristics, the classification of the multimedia objects according to their I/O requirements, and the fragmentation strategies. We use a bipartite graph model for mapping of fragments to storage devices. A cost function based on a disk utilization per allocated space, the amount of free space, and the bandwidth of a storage device is used to determine the optimal allocation for an object's data.     

多媒体数据库系统研究与设计

多媒体数据资源的数量庞大,使得对其的管理日益成为一个严峻的问题。多媒体数据不同于传统数据,是一种非格式化数据,具有对象复杂、存储分散及时空同步等特点。提出了对多媒体数据建立多媒体数据库进行管理,并分析和设计了相应的多媒体数据库。     

Multimedia cloud transmission and storage system based on internet of things

For the issues of large space and storage security of multimedia files, we analyzed the impact of access control and cloud storage on multimedia file, and proposed a mixed security cloud storage framework based on Internet of Things. This paper introduced the concept of multimedia protection into the method based on role access control. Moreover, we also adopted a scheme based on the combination of multimedia data state and role access control. At the same time, all input and output devices were connected to this system. Internet of Things is used to judge whether circuits are connected and whether the devices are normally operated, so as to improve the access efficiency. On this basis, we also described in detail the complete process of registration, role assignment, multimedia file owner’s request for data encryption, and user login and access to multimedia file. According to the result, this scheme can be used to resist the known attacks. It guarantees security of multimedia files.     

混合类型多媒体负载访问存储系统的统计学访问控制算法

混合类型多媒体负载访问存储系统是一个复杂的过程，不同类型的多媒体应用要求存储系统提供不同的服务质量保证．存储系统需要一个有效的访问控制算法，为尽可能多的多媒体应用提供保证服务质量的服务．对混合类型多媒体负载访问存储系统的访问控制问题进行了系统的研究：定义多媒体应用访问存储系统的服务质量参数；建立并发多媒体应用的汇聚负载模型；推导出混合类型多媒体负载的访问控制约束条件；实现相应的统计学访问控制算法．仿真实验的结果表明，新的存储系统访问控制算法是有效的，并具有相当高的精确度．     

Scheduling and data layout policies for a near-line multimedia storage architecture

Recent advances in computer technologies have made it feasible to provide multimedia services, such as news distribution and entertainment, via high-bandwidth networks. The storage and retrieval of large multimedia objects (e.g., video) becomes a major design issue of the multimedia information system. While most other works on multimedia storage servers assume an on-line disk storage system, we consider a two-tier storage architecture with a robotic tape library as the vast near-line storage and an on-line disk system as the front-line storage. Magnetic tapes are cheaper, more robust, and have a larger capacity; hence, they are more cost effective for large scale storage systems (e.g., video-on-demand (VOD) systems may store tens of thousands of videos). We study in detail the design issues of the tape subsystem and propose some novel tape-scheduling algorithms which give faster response and require less disk buffer space. We also study the disk-striping policy and the data layout on the tape cartridge in order to fully utilize the throughput of the robotic tape system and to minimize the on-line disk storage space.     

分层多媒体数据模型的研究及应用

本文提出了一种分层多媒体数据模型，以有效地解决多媒体数据的表示，存储和媒体同步。该模型分为数据定义层ＤＤＬ，数据操纵层ＤＭＬ，数据显示层ＤＰＬ和控制层ＣＬ四层，这里重点阐述了ＤＤＬ和ＤＭＬ层。在多媒体办公系统ＴＨＭＯＳ中，我们综合应用了ＬＭＤＭ的思想，较好地实现了多媒体文件的数据库功能。     

ORACLE INTERMEDIA技术在网站内容管理中的应用研究

使用ORACLE9i数据库平台,将Oracle InterMedia技术和J2EE技术相结合,通过网站内容管理的实现分析了Oracle InterMedia在实现多媒体数据处理方面的技术优势;给出了多媒体数据、特别是图像数据在ORACLE数据库中存储的基本设计方法、以及关系数据库环境下实现结构化与非结构化数据管理的基本思路.     

Privacy-preserving public auditing for educational multimedia data in cloud computing

Nowadays, as distance learning is being widly used, multimedia data becomes an effective way for delivering educational contents in online educational systems. To handle the educational multimedia data efficiently, many distance learning systems adopt a cloud storage service. Cloud computing and storage services provide a secure and reliable access to the outsourced educational multimedia contents for users. However, it brings challenging security issues in terms of data confidentiality and integrity. The straightforward way for the integrity check is to make the user download the entire data for verifying them. But, it is inefficient due to the large size of educational multimedia data in the cloud. Recently many integrity auditing protocols have been proposed, but most of them do not consider the data privacy for the cloud service provider. Additionally, the previous schemes suffer from dynamic management of outsourced data. In this paper, we propose a public auditing protocol for educational multimedia data outsourced in the cloud storage. By using random values and a homomorphic hash function, our proposed protocol ensures data privacy for the cloud and the third party auditor (TPA). Also, it is secure against lose attack and temper attack. Moreover, our protocol is able to support fully dynamic auditing. Security and performance analysis results show that the proposed scheme is secure while guaranteeing minimum extra computation costs.     

一种高性能多媒体对象存储系统的研究

通过对多媒体应用中多用户并发访问的特点和性能进行分析,提出一种高性能多媒体对象存储系统MOSS(Multime-dia Object Storage System)的对象数据组织结构.MOSS结构采用两层结构,下层采用RAID5的方式组织数据,这样可以利用RAID5磁盘利用率高的优势.上层放常用的热点数据,通过将不同对象存放在不同磁盘,从而将不同用户的请求尽量分散到不同的磁盘上,可以提高多用户的并发访问性能.通过仿真测试,在4用户情况下,MOSS的性能平均比RAID高90%,随着用户数的增加,传统RAID方式的性能下降明显,而MOSS的性能下降很少,在16用户情况下,MOSS的性能平均比RAID高550%.