PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Computer Storage Devices”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 217 records · Page 12Linked to original sources
PubMed1995

Regional medical information network using optical memory cards and integrated services for digital network.

Since 1986, we have been developing a regional health and welfare system using optical memory cards. We have expanded the system and performed model experiments and evaluations this time. There are approximately 3000 card-holders and 23 card-reader terminals in use. They cover 50 percent of the medical facilities in the city of Isehara. Two medical clinics within neighboring cities have joined our project. Standard Deviation Index (SDI) has been introduced to standardize the numeric results of examinations. The terminals are connected with Integrated Services for Digital Network (ISDN) allowing remote access to the optical memory cards. This enhanced connectivity has allowed greater cooperation in delivering quality medical services.

Aged↗
PubMed1987

Analog and digital computer theory.

Analog signals abound in the natural world. With appropriate transducers these signals can be converted to continuous voltages and can be displayed, transmitted, stored, or copied. They can be processed by analog computers, the simplest of which is an audio amplifier. With analog signals, however, there can be errors because of signals loss, interference, and noise. Binary digital signals permit only two values, either 0 ('off' or 'low') or 1 ('on' or 'high'). These signals are much less susceptible to transmission problems. Binary signals are commonly organized into 8-bit groups which can represent 256 different numbers or meanings. These data can be transmitted in either serial or parallel fashion at high rates of speed. Analog-to-digital converters permit analog signals to be transformed to digital signals. A computer consists of the memory, the processor, and the input/output devices. Memory includes the fastest registers, the very fast core memory, the peripheral storage devices such as diskettes and disks, and the very slow peripheral devices such as magnetic tape. The processor can only load and store numbers in memory, add two numbers, test a number, and provide input and output. The program counter indicates the next computer instruction to be performed. Input/output devices allow communication with the outside world and may assume many forms. A computer by itself can do nothing. A program or series of instructions is required. The most simplistic program language is assembler or machine language. Most programming is done in more sophisticated languages, however.(ABSTRACT TRUNCATED AT 250 WORDS)

Analog-Digital Conversion↗
PubMed1992

CD-ROM source data uploaded to the operating and storage devices of an IBM 3090 mainframe through a PC terminal.

A powerful method of processing MEDLINE and CINAHL source data uploaded to the IBM 3090 mainframe computer through an IBM/PC is described. Data are first downloaded from the CD-ROM's PC devices to floppy disks. These disks then are uploaded to the mainframe computer through an IBM/PC equipped with WordPerfect text editor and computer network connection (SONNGATE). Before downloading, keywords specifying the information to be accessed are typed at the FIND prompt of the CD-ROM station. The resulting abstracts are downloaded into a file called DOWNLOAD.DOC. The floppy disks containing the information are simply carried to an IBM/PC which has a terminal emulation (TELNET) connection to the university-wide computer network (SONNET) at the Ohio State University Academic Computing Services (OSU ACS). The WordPerfect (5.1) processes and saves the text into DOS format. Using the File Transfer Protocol (FTP, 130,000 bytes/s) of SONNET, the entire text containing the information obtained through the MEDLINE and CINAHL search is transferred to the remote mainframe computer for further processing. At this point, abstracts in the specified area are ready for immediate access and multiple retrieval by any PC having network switch or dial-in connection after the USER ID, PASSWORD and ACCOUNT NUMBER are specified by the user. The system provides the user an on-line, very powerful and quick method of searching for words specifying: diseases, agents, experimental methods, animals, authors, and journals in the research area downloaded. The user can also copy the TItles, AUthors and SOurce with optional parts of abstracts into papers under edition. This arrangement serves the special demands of a research laboratory by handling MEDLINE and CINAHL source data resulting after a search is performed with keywords specified for ongoing projects. Since the Ohio State University has a centrally founded mainframe system, the data upload, storage and mainframe operations are free.

CD-ROM↗
PubMed1999

Migration from hierarchal storage management to ASM storage server: a case study.

The Department of Radiology at the University of Utah Hospitals and Clinics had to make a change from its current hierarchical storage management (HSM) system. The HSM software is the heart of any near-line data storage system and any change in this software affects all near-line and on-line data storage. In this case, over a terabyte of data had been migrated in more than 2 million files. The traditional method of reading in the old data and then writing it out to the new system was calculated to take more than 60 years. Here, we will examine the reasons for making such a radical change in the HSM used. We will also discuss why ASM (the new HSM software) was selected, and the performance improvements seen. A second, less difficult transition was made a few months later, of upgrading to a newer faster tape technology. The two types of tapes were incompatible, but the storage software and robotics used allowed for a peaceful coexistence during the transition. The transition from HSM to ASM was not a trivial task. It required a reasonable implementation/migration plan, which involved finding the correct resources and thinking outside the norm for solutions. All sites that have any amount of data stored in near-line devices will face similar conversions. This presentation should help in the event that a data conversion plan is not already in place.

Computer Systems↗
PubMed2003

Photochemical molecular devices.

The concept of a macroscopic device can be extended to the molecular level by designing and synthesising (supra)-molecular species capable of performing specific functions. Molecular devices operate via electronic and/or nuclear rearrangements and, like macroscopic devices, need energy to operate and signals to communicate with the operator. The energy needed to make a device work can be supplied as chemical energy, electrical energy, or light. Luminescence is one of the most useful techniques to monitor the operation of molecular-level devices. The extension of the concept of a device to the molecular level is of interest, not only for basic research, but also for the growth of nanoscience and the development of nanotechnology. Molecular-level devices should find applications in information storage, display, and processing; in the long run, they are expected to lead to the construction of molecular-based (chemical) computers. In this perspective article, some of the most recent achievements in the field of photochemical molecular devices will be illustrated, with particular reference to (i) devices for photoinduced energy or electron transfer; (ii) devices for information processing based on photochemical or photophysical processes; (iii) devices designed to obtain extensive conformational changes upon photoexcitation (photochemically driven molecular machines).

Journal Article↗
PubMed1990

Data acquisition and analysis system for intracellular neuronal signals.

A comprehensive system for the acquisition and analysis of neurophysiological data is described, with a focus on intracellular data. The software comprising the system will evaluate a number of neuronal signals, including intracellular as well as extracellular recordings from neurons, evoked potentials and computer simulation data. Significant enhancements enable sampling at high resolution (50 kHz throughput to disk; +/- 15 bit or 96 db), concurrent with extensive on-line analysis capabilities and display. Modifications of existing software and development of new types of input and output devices and analysis can be incorporated as needed, using a binary digital database as the primary storage for the experimental signals and device-independent graphics.

Cell Communication↗
PubMed1982

A peripheralized digital image management system: prospectus.

The number of diagnostic radiology examinations being performed on digitally formatted imaging equipment is continually increasing. However, most digital data are recorded as analogue images and the films stored in a central file. The dynamic range of raw digital data is lost. Currently, the space and cost requirements for storage of all digital data have discouraged most users from attempting it. This article presents the concepts and describes the requirements and initial fabrication of a system that will capture and retain all digital data using a network of peripheralized image acquisition, display, and storage devices. Any piece of digitally formatted equipment can be interfaced into the system. A real-time computer capability provides that any digital examination can be reviewed at any display station for up to 10 days.

Computers↗
PubMed1999

Assessment of public health computer readiness for 2000--United States, 1999.

Computer software, equipment, and other devices that contain embedded microchips that store and process dates may use two-digit years (e.g., 99 for 1999) to reduce data entry burden and save electronic storage space; these devices may not work properly when the year 2000 (Y2K) arrives. Many aspects of health-care delivery, public health surveillance and research, and critical infrastructure components (e.g., utilities and transportation services) depend on vulnerable computers. To ensure that critical public health functions will not be compromised because of Y2K problems, CDC assessed state public health agency readiness for Y2K. This report describes the findings of the assessment, which indicate that state health agencies that responded are substantially ready for Y2K and plan to reach full readiness in 1999.

Chronology as Topic↗
PubMed1993

Basics of computer hardware and software.

The basics of computer hardware and software are presented. A computer is a general-purpose electronic counting device used in data processing because of its accuracy and high speed. The physical components of a computer system are called the hardware, which includes the central processing unit and peripheral equipment for data input, output, and storage. Computer capacity is measured by the amount of data that can be stored in main memory and by the computer word size. Performance is indicated by the speed with which instructions are executed. Input devices (e.g., keyboard-type terminals) are the components that accept raw data and convert it into electronic form, and output devices (e.g., video display terminals) present the results of data processing in human-readable form. System software is the set of instructions that facilitate hardware use and allow the application software, which solves specific user problems, to run efficiently. System and application software is written by using various machine and symbolic languages. Milestones in software-development techniques include program subroutine use, modular programming, functional decomposition, structured programming, and structured analysis. Objectives in improving software quality are reducing development costs, making maintenance easier, and making development results more predictable. Because software development has lagged behind revolutionary advances in hardware, the full potential of computers has yet to be realized.

Computer Literacy↗
PubMed1983

An interactive microcomputer program for calculation of combined parenteral and enteral nutrition for neonates.

A responsive, iterating program is described (available on diskette from first author), which enables the physician to formulate a balanced, total parenteral nutrition (TPN) for low-birth-weight and sick newborns. The program allows for the possibility of TPN or simultaneous intravenous, intraarterial, and oral feeding. It calculates the overall balance of fluids, nutrients, calories, electrolytes, minerals, trace elements, and vitamins. It features the integration of algorithms and limit tests of nutritional balance, to produce a feeding program that can be modified by clinical considerations of the physician, specific for each patient. The entire procedure can be accomplished, and a record of the entries and orders to the pharmacy and to the ward staff printed, within about 4-5 min. The program, which is written in BASIC, can be accommodated within and operated with a 16K byte microcomputer, equipped with a monitor, a printer, and a diskette or other program storage device.

Computers↗
PubMed2001

A hierarchical storage management (HSM) scheme for cost-effective on-line archival using lossy compression.

A hierarchical storage management (HSM) scheme for cost-effective on-line archival of image data using lossy compression is described. This HSM scheme also provides an off-site tape backup mechanism and disaster recovery. The full-resolution image data are viewed originally for primary diagnosis, then losslessly compressed and sent off site to a tape backup archive. In addition, the original data are wavelet lossy compressed (at approximately 25:1 for computed radiography, 10:1 for computed tomography, and 5:1 for magnetic resonance) and stored on a large RAID device for maximum cost-effective, on-line storage and immediate retrieval of images for review and comparison. This HSM scheme provides a solution to 4 problems in image archiving, namely cost-effective on-line storage, disaster recovery of data, off-site tape backup for the legal record, and maximum intermediate storage and retrieval through the use of on-site lossy compression.

Algorithms↗
PubMed1994

IS & C implementation of an image workstation.

The Image Save & Carry (IS & C) 5-inch magneto-optical disk system was introduced to a PACS image workstation so as to exchange digital image data between two independent PACS modules. The results showed that it was possible to connect two different PACS modules by off-line data transmission. Also, the IS & C standard software proved to be of high speed read/write performance for several data files on an image workstation. However, when the IS & C is implemented to the high resolution real-time digital radiography system, an image compression standard will be required to expand its capacity.

Animals↗
PubMed1992

Portable chest radiography in intensive care: a comparison of computed and conventional radiography.

A prospective study was performed comparing computed and conventional radiography for the detection and visibility of cardiovascular devices in intensive care unit patients. Computed images were obtained using a commercially available 2K x 2K, 12-bit storage phosphor plate system. Image sets from 50 patients were assessed independently by three observers. A significant difference between the types of image was found for the detection of mediastinal drainage tubes and prosthetic valves. Computed images allowed greater confidence in the identification of courses and tips of lines. This advantage was most marked with edge-enhanced computed images.

Adult↗
PubMed1993

Operating system components--Part II.

To summarize this discussion, let us look at a prototype, a capsule scenario in an OS. You make a process creation request on your local timeshare system. The long-term scheduler queues up this request, and eventually creates the corresponding process. Your process takes its turns executing, scheduled by the short-term scheduler. You request a tape drive to retrieve some archived data you need, and thus invoke the resource manager. You use the file manager to access the archived data. You use the I/O system to interact with the application program and to print the reports. The memory manager is swapping pages of your data and program between main memory and secondary memory. The dispatcher in the kernel is loading your process context into the CPU when your process is next on the execute list. The interrupt handler in the kernel is servicing interrupt requests, such as those made when you do I/O to the tape. The concurrency control in the kernel is coordinating your updating and spooled printing activities. So, your process is invoking activities throughout the various layers of the OS. Most of the time, you are unaware of these many varied activities.

Computer Systems↗