131,045 research outputs found
SIMOS feasibility report, task 4 : sign inventory management and ordering system
No full textThe Sign Inventory Management and Ordering System (SIMOS) design is a merger of existing manually maintained information management systems married to PennDOT's GIS and department-wide mainframe database to form a logical connection for enhanced sign management. To minimize the development costs, consideration was given to utilize existing hardware, software, communication channel and applications. The SIMOS project involved recommendations for reengineering the sign inventory/management procedures currently in place, and provides the technological solutions for effective statewide sign management
Numerical Analysis of Passively Mode-Locked Quantum-Dot Lasers With Absorber Section at the Low-Reflectivity Output Facet
No full textIn this paper, we present a theoretical study on the optimization of passively mode-locked quantum dot lasers based on an alternative cavity design. In particular, we investigate a geometry in which the saturable absorber is located near the low reflection facet of the chip (output facet). The investigation is carried out by means of a time-domain traveling wave numerical model for quantum-dot active medium for both the gain and absorbing sections. The analysis shows superior performance in terms of pulsewidth and peak power of devices based on the new geometry compared to devices based on the conventional geometry, where the saturable absorber is placed near the high reflectivity facet. The optimization relies on the enhanced bleaching of the saturable absorber when the latter is located near the output facet, which prevents the generation of colliding or self-colliding pulse effect
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
D -stability characterization problem can exhibit a polynomial computational complexity
No full textSince its appearance, the D-stability characterization problem was claimed to be NP-hard and actually it was solved efficiently for matrices of very low orders only. Recently, we introduced a new approach which makes this problem numerically feasible, since the related algorithm shows a practical computational complexity which reveals polynomial. After some remarks on computational complexity theory, here we provide details about the computational complexity of D-stability characterization problem and its historical improvement
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
LUP887793 Supplementary material - Supplemental material for Regional cerebral perfusion correlates with anxiety in neuropsychiatric SLE: evidence for a mechanism distinct from depression
No full textSupplemental material, LUP887793 Supplementary material for Regional cerebral perfusion correlates with anxiety in neuropsychiatric SLE: evidence for a mechanism distinct from depression by E Papadaki, E Kavroulakis, G Bertsias, A Fanouriakis, D Karageorgou, P Sidiropoulos, E Papastefanakis, D T Boumpas and P Simos in Lupus</p
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
On some conservation properties of the Trapezoidal Method applied to Hamiltonian systems
No full textThere is enough experimental and theoretical evidence that symmetric methods nearly preserve energy for long times when applied to several classes of Hamiltonian systems. In this paper we propose an interpretation of such good behaviour based on the definition of the discrete line integral
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