A hash function used for content addressing is different from the hash function used for content verification. Adding a file to a database involves storing both hash function values in a table as pair. Verifying the integrity of a file believed to be a duplicate in a database, or when retrieving a file, makes use of the verification hash function. Files can be continuously checked. A multi-level database can be used. A second hash function can be added to an existing system. A verification hash function can be upgraded and more than one content verification hash function can be used. In a variation, a randomnumber generator is used instead of a hash function for content addressing; the verification hash function is also used. Files addressed using a random number are added or retrieved from a database and their verification hash values are checked. Time stamps and digital signatures are used for security.

Additional hash functions in content-based addressing

Embodiments of the systems and methods disclosed provide a distributed RAID system comprising a set of data banks. More particularly, in certain embodiments of a distributed RAID system each data bank has a set of associated storage media and executes a similar distributed RAID application. The distributed RAID applications on each of the data banks coordinate among themselves to distribute and control data flow associated with implementing a level of RAID in conjunction with a volume stored on the associated storage media of the data banks. Migration of volumes, or portions thereof, from one configuration to another configuration may be accomplished according to a priority associated with the volume.

Method and System for Rebuilding Data in a Distributed RAID System

The present invention is a method and apparatus for providing telecommunication connectivity between various electronic devices and to provide for digital data transfer from one device to other, peer-to-peer and/or point-to-point, either by way of a wireless device, over a switched-circuit analog audio network (i.e. Land based or cellular telephone service), or other wired networks. The invention provides an audio/visual experience in conjunction with the observation of static information from a display. Users of the system technology can interact with and receive information from a public display, advertisement, promotional display or other signage device to a personal hand held electronic device such as a PDA, cell phone or computer or other specialized receiving device for current use or later retrieval and usage. The audio/visual content information delivery system may be resident in billboards, kiosks, telephone booths, taxi tops or other advertising locations to provide embedded brochures, promotions and other marketing or promotional copy. The information delivery system can also be employed in conjunction with the delivery of non-commercial information such as data relating to displays of art. Users of the system technology can acquire information from a museum's database relating to art which they are observing, or that they want to learn about. The user can upload text, photos, audio and video clips and can communicate with others, either in real time or in archived memory about the exhibits that they are viewing. The system technology permits the receipt of data via a URL or similar designation, related to the display, which permits the user to download the data and use it to key to access a website or other form of electronic content or communication delivered over an electronic communication network. The system also permits variation of the delivered information in a context-sensitive manner by permitting the user to interact with the delivered information and determine what is of immediate interest, what they wish to store and retrieve at a later time, what they wish to transmit via e-mail to their inbox for home viewing and what they wish to ignore. The system transmitter is also capable of being varied to transmit different data, in accordance with the broadcast decisions of the advertiser, museum or site holder.

Method and apparatus for transmitting information from point-to-point

A method to circumvent malicious software via a system configured to bypass a device driver stack and, consequently, also bypass the malicious software that may be adversely affecting the device driver stack by using an alternative stack such as a crash dump I/O stack. The crash dump I/O stack is poorly documented relative to the device driver stack and functions independently from the device driver stack.

System to bypass a compromised mass storage device driver stack and method thereof

An apparatus for generating electromagnetic radiation in which the radiation has both a first and second utility. The electromagnetic radiation is modulated to produce electronically detectable variations to achieve the second utility, the variations not affecting the first utility. In one embodiment, the electromagnetic radiation is visible light. In this embodiment, the first utility is illumination and the second utility is the transmission of data. In another embodiment, the invention provides a lamp for generating visible light capable of providing illumination and transmitting data to a receiver. Any variations in the visible light resulting from the data transmission are imperceptible by a human eye regardless of the nature of the data being transmitted.

Dual-use electronic transceiver set for wireless data networks

The data storage facility includes a plurality of data storage devices coupled through multi-path connections to cache memory A plurality of interfaces to host processors communicates with the cache memory and with cache tag controllers that define the cache memory again over multiple paths

Distributed, scalable data storage facility with cache memory

Disclosed is inhibiting process starvation in a multitasking operating system by providing a first type of scheduling event at periodic timer intervals, providing a second type of second scheduling event in response to a running processes voluntarily relinquishing the processor, and, in response to a scheduling event, replacing an old process with a new process only if the old process has run for more than a predetermined amount of time The predetermined amount of time may be one half of the timer interval The system described herein provides a small kernel that can run on a variety of hardware platforms, such as a PowerPC based Symmetrix adapter board used in a Symmetrix data storage device provided by EMC Corporation of Hopkinton, Mass The core kernel code may be written for the general target platform, such as the PowerPC architecture Since the PowerPC implementation specific modules are well defined, the system may be quite portable between PowerPC processors (such as the 8260 and 750), and should prove relatively easy to port to any PowerPC based Symmetrix adapter board/CPU combination The kernel may also be ported to run on other RISC machines (Hitachi SH series) and can be ported to CISC architectures

Inhibiting starvation in a multitasking operating system

Disclosed is providing one of a plurality of schedulers for a multitasking system for a processor that includes choosing a particular one of the schedulers, setting a program counter to an address corresponding to code of the particular one of the schedulers, and the processor executing code at an address corresponding to the program counter Also included may be setting a stack pointer to an address corresponding to stack space for the particular one of the schedulers and the processor using the stack space at the stack pointer after executing code at the address corresponding to the program counter The system described herein provides a small kernel that can run on a variety of hardware platforms, such as a PowerPC based Symmetrix adapter board used in a Symmetrix data storage device provided by EMC Corporation of Hopkinton, Ma The core kernel code may be written for the general target platform, such as the PowerPC architecture Since the PowerPC implementation specific modules are well defined, the system may be quite portable between PowerPC processors (such as the 8260 and 750), and should prove relatively easy to port to any PowerPC based Symmetrix adapter board/CPU combination The kernel may also be ported to run on other RISC machines (Hitachi SH series) and can be ported to CISC architectures

Replaceable scheduling algorithm in multitasking kernel

Orator units are associated with particular exhibit or guiding locations and provide an audio commentary by the medium of ON and OFF states of electromagnetic radiation. Auditor units are portable units associated with paritcular viewers or users and are adapted to detect the electromagnetic radiation and produce therefrom the audio commentary. The auditor unit may be designed to signal, the orator through ON or OFF states of electromagnetic radiation the request for a commentary. The orator unit may be designed to provide a commentary in response to the auditor request. An orator may be designed to provide a plurality of commentaries on corresponding frequency modulation (FM) channels (which are converted to and from electromagnetic radiation) and the orator and auditor may be designed so that the orator may tune the auditor to demodulate only the FM channel corresponding to the auditor's selected type and time of commentary. A plate encoded with conducting and non-conducting areas may be used to encode an auditor unit to cause it to select the type commentary desired by a viewer or user.

Audio commentary system

Managing memory includes subdividing the memory into a first set of blocks corresponding to a first size and a second set of blocks corresponding to a second size that is greater than said first size, in response to a request for an amount of memory that is less than or equal to the first size, providing one of the first set of blocks, and, in response to a request for an amount of memory that is greater than the first size and less than or equal to the second size, providing one of the second set of blocks. Subdividing the memory may also include subdividing the memory into a plurality of sets of blocks, where each particular set contains blocks corresponding to one size that is different from that of blocks not in the particular set. Each set of blocks may correspond to a size that is a multiple of a predetermined value. Managing memory may also include providing a table containing an entry for each set of blocks. The entry for each set of blocks may be a pointer to one of: an unused block and null. Unused blocks of a set may be linked together to form a linked list where the pointer for each entry in the table points to the first block in the list.

Bucket based memory allocation

Popular Tasks used by Researchers

How can I help with your research?

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

We encountered an error while loading the panel. Please try refreshing the page.

Something went wrong

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

Anyone with the link can view this chat. You can switch it back to private anytime.

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Steven R. Chalmer

Author Tools

Chat about Author