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Personal computer

About: Personal computer is a research topic. Over the lifetime, 58809 publications have been published within this topic receiving 800814 citations. The topic is also known as: PC.


Papers
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Journal ArticleDOI
TL;DR: The reliability and validity coefficients are of sufficient magnitude to make the touch and mouse PC versions of the UFOV practical for use in clinical evaluations.
Abstract: The Useful Field of View test (UFOV(1)) is a measure of processing speed that predicts driving performance and other functional abilities in older adults. In comparison to a number of other visual and cognitive measures, the UFOV measure has consistently been found to be the strongest predictor of motor vehicle crashes of older adults. This measure has valuable applications in that computerized, performance-based measures that are predictive of crashes in the elderly population can provide an objective criterion for determining the need for driver restriction or rehabilitation. Administration of the UFOV test has evolved from the standard version (administered via touch-screen with the Visual Attention Analyzer) to two briefer versions, which are administered on a personal desktop computer (PC) using either a touch screen or mouse response option. These new versions of the test are briefer and require less specialized equipment, making the test more portable and practical for use in clinical settings. This study examined the reliability and validity of the scores from these two new versions. Results indicate that test-retest reliabilities of the scores from the UFOV PC versions are high (r's= 0 .884 for mouse and 0.735 for touch), and performance on both PC versions correlates well with performance on the standard version (r's = 0.658 for mouse and 0.746 for touch). Furthermore, scores were highly correlated (r = 0.916) when participants used either a touch screen or a mouse to input responses. In conclusion, the reliability and validity coefficients are of sufficient magnitude to make the touch and mouse PC versions of the UFOV practical for use in clinical evaluations.

267 citations

Patent
30 Jun 1998
TL;DR: In this article, an advertising system for a personal computer (PC) stores an advertising message as part of software which has been installed after its purchase from a software vendor, and the message is presented to the user only during waiting times when documents derived from the PC are being printed.
Abstract: An advertising system for a personal computer (PC) stores an advertising message as part of software which has been installed after its purchase from a software vendor. The message is presented to the user only during waiting times when documents derived from the PC are being printed.

266 citations

Journal ArticleDOI
TL;DR: It is demonstrated that FR3D finds all occurrences, both local and composite and with nucleotide substitutions, of sarcin/ricin and kink-turn motifs in the 23S and 5S ribosomal RNA 3D structures of the H. marismortui 50S ribOSomal subunit and assigns the lowest discrepancy scores to bona fide examples of these motifs.
Abstract: New methods are described for finding recurrent three-dimensional (3D) motifs in RNA atomic-resolution structures. Recurrent RNA 3D motifs are sets of RNA nucleotides with similar spatial arrangements. They can be local or composite. Local motifs comprise nucleotides that occur in the same hairpin or internal loop. Composite motifs comprise nucleotides belonging to three or more different RNA strand segments or molecules. We use a base-centered approach to construct efficient, yet exhaustive search procedures using geometric, symbolic, or mixed representations of RNA structure that we implement in a suite of MATLAB programs, “Find RNA 3D” (FR3D). The first modules of FR3D preprocess structure files to classify base-pair and -stacking interactions. Each base is represented geometrically by the position of its glycosidic nitrogen in 3D space and by the rotation matrix that describes its orientation with respect to a common frame. Base-pairing and base-stacking interactions are calculated from the base geometries and are represented symbolically according to the Leontis/Westhof basepairing classification, extended to include base-stacking. These data are stored and used to organize motif searches. For geometric searches, the user supplies the 3D structure of a query motif which FR3D uses to find and score geometrically similar candidate motifs, without regard to the sequential position of their nucleotides in the RNA chain or the identity of their bases. To score and rank candidate motifs, FR3D calculates a geometric discrepancy by rigidly rotating candidates to align optimally with the query motif and then comparing the relative orientations of the corresponding bases in the query and candidate motifs. Given the growing size of the RNA structure database, it is impossible to explicitly compute the discrepancy for all conceivable candidate motifs, even for motifs with less than ten nucleotides. The screening algorithm that we describe finds all candidate motifs whose geometric discrepancy with respect to the query motif falls below a user-specified cutoff discrepancy. This technique can be applied to RMSD searches. Candidate motifs identified geometrically may be further screened symbolically to identify those that contain particular basepair types or base-stacking arrangements or that conform to sequence continuity or nucleotide identity constraints. Purely symbolic searches for motifs containing user-defined sequence, continuity and interaction constraints have also been implemented. We demonstrate that FR3D finds all occurrences, both local and composite and with nucleotide substitutions, of sarcin/ricin and kink-turn motifs in the 23S and 5S ribosomal RNA 3D structures of the H. marismortui 50S ribosomal subunit and assigns the lowest discrepancy scores to bona fide examples of these motifs. The search algorithms have been optimized for speed to allow users to search the non-redundant RNA 3D structure database on a personal computer in a matter of minutes.

266 citations

Journal Article
TL;DR: Anderson et al. as mentioned in this paper proposed a strategic approach to planning for future channel configurations, control of the channel, and resource commitment, which is based on sound design principles that recognize that the distribution strategy must contribute to the business's overall objectives.
Abstract: Three forces are changing the customary rules of distribution channel management: proliferating customers' needs, shifts in the balance of power in channels, and changing strategic priorities. Many firms are outsourcing the distribution function to third parties. Others, using IT, direct marketing, database marketing, and other variations contact customers directly, so the roles of the distributor or dealer are evolving. And some firms are simultaneously experimenting with a number of distribution options before committing to one system. A personal computer, for example, may be available by direct mail or through a computer superstore or a specialty store. Firms are also dealing through specialists rather than generalists, because specialists tend to be more focused and nimble than the manufacturer in a turbulent environment. The authors propose a strategic approach to planning for future channel configurations, control of the channel, and resource commitment. The channel must address customers' needs, ensure that the customer sees the value in the company's offering, be cost-efficient, and handle any new products and services that emerge. Anderson et al. suggest that a company first assess its current distribution channels, each channel's profitability, its market coverage, and the cost of each channel function. Next, a company should choose a channel arrangement based on sound design principles that recognize that the distribution strategy must contribute to the business's overall objectives.

266 citations

Journal ArticleDOI
TL;DR: In this article, two alternative modes of operation for the current-source flyback inverter are investigated and compared in order to establish their advantages as well as their suitability for the development of an inverter for decentralized grid-connected PV applications.
Abstract: Two alternative modes of operation for the current-source flyback inverter are investigated in this paper. The discontinuous conduction mode (DCM), where a constant switching frequency (CSF) control method is applied, and the boundary between continuous and DCM (BCM) that is introduced for photovoltaic (PV) applications in this paper (where a variable switching frequency control method is applied). These two control methods are analytically studied and compared in order to establish their advantages as well as their suitability for the development of an inverter for decentralized grid-connected PV applications. An optimum design methodology is developed, aiming for an inverter with the smallest possible volume for the maximum power transfer to the public grid and wide PV energy exploitation. The main advantages of the current-source flyback inverter are very high-power density and high efficiency due to its simple structure, as well as high-power factor regulation. The design and control methodology are validated by personal computer simulation program with integrated circuit emphasis (PSPICE) simulation and experimental results, accomplished on a laboratory prototype.

266 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202227
2021418
2020954
20191,407
20181,342