566 research outputs found
Exploiting Domain Knowledge in Making Delegation Decisions
@inproceedings{conf/admi/EmeleNSP11, added-at = {2011-12-19T00:00:00.000+0100}, author = {Emele, Chukwuemeka David and Norman, Timothy J. and Sensoy, Murat and Parsons, Simon}, biburl = {http://www.bibsonomy.org/bibtex/20a08b683088443f1fd36d6ef28bf6615/dblp}, booktitle = {ADMI}, crossref = {conf/admi/2011}, editor = {Cao, Longbing and Bazzan, Ana L. C. and Symeonidis, Andreas L. and Gorodetsky, Vladimir and Weiss, Gerhard and Yu, Philip S.}, ee = {http://dx.doi.org/10.1007/978-3-642-27609-5_9}, interhash = {1d7e7f8554e8bdb3d43c32e02aeabcec}, intrahash = {0a08b683088443f1fd36d6ef28bf6615}, isbn = {978-3-642-27608-8}, keywords = {dblp}, pages = {117-131}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, timestamp = {2011-12-19T00:00:00.000+0100}, title = {Exploiting Domain Knowledge in Making Delegation Decisions.}, url = {http://dblp.uni-trier.de/db/conf/admi/admi2011.html#EmeleNSP11}, volume = 7103, year = 2011 }Postprin
Towards a holistic approach to economic development : incorporating institutional and Schumpeterian economics into development dynamics
PURPOSE: This article tries to locate the deeper roots for high development performance of an
economy to take place, focusing on its most decisive factors, being the institutional structures
that provide the incentives for human choices and behaviors, i.e., trust, cooperation, security,
participation, risk and entrepreneurship.DESIGN/METHODOLOGY/APPROACH: Using the theoretical lens of institutional economics,
expressing their key concepts as measurable variables and considering the framework of
modern growth strategies, it became feasible to form a simulation model of the development
process, used as the conceptual model that formed the framework for measurable variables
to be utilized under the methodological approach of SEM, providing a path diagram of 13
factors, with data from 61 countries for the time period from 2017 until 2019.FINDINGS: Results suggested that the necessary conditions for production chains to be
interconnected and pioneering development to take place are open market structures and
efficient institutions of entrepreneurship, provided also that institutions of political isonomy
and conditions of creative destruction penetrate throughout the development process.PRACTICAL IMPLICATIONS: Modeling economy as a complex dynamic system of changing
structures and behaviors, one can incorporate the view from a policy maker who is in
charge of stimulating the innovative capacity of human capital, aiming at changing
behaviors through experimentation with institutional interconnections, being committed to
citizen inclusiveness into the decision making processes.ORIGINALITY/VALUE: This article offers an alternative view of the production cycle, not of an
industrial product, but of GDP, utilising the analogy of the production space of a firm, and
extending it to the evolutionary dynamics of an economy, theorised as a networked system of
institutional structures that provide the productivity apparatus for the envisioning of the new
cultural and technological trends.peer-reviewe
Algorithms for Visualizing Phylogenetic Networks
We study the problem of visualizing phylogenetic networks, which are
extensions of the Tree of Life in biology. We use a space filling visualization
method, called DAGmaps, in order to obtain clear visualizations using limited
space. In this paper, we restrict our attention to galled trees and galled
networks and present linear time algorithms for visualizing them as DAGmaps.Comment: Appears in the Proceedings of the 24th International Symposium on
Graph Drawing and Network Visualization (GD 2016
The central energy source of 70micron-selected galaxies: Starburst or AGN?
We present the first AGN census in a sample of 61 galaxies selected at
70microns, a wavelength which should strongly favour the detection of
star-forming systems. For the purpose of this study we take advantage of deep
Chandra X-ray and Spitzer infrared (3.6-160micron) data, as well as optical
spectroscopy and photometry from the Deep Extragalactic Evolutionary Probe 2
(DEEP2) survey for the Extended Groth Strip (EGS) field. We investigate
spectral line diagnostics ([OIII]/Hbeta and [NeIII]/[OII] ratios, Hdelta Balmer
absorption line equivalent widths and the strength of the 4000Ang break), X-ray
luminosities and spectral energy distributions (SEDs). We find that the
70micron sources are undergoing starburst episodes and are therefore
characterised by a predominance of young stars. In addition, 13 per cent of the
sources show AGN signatures and hence potentially host an AGN. When the sample
is split into starbursts (SBs, 10^10<L_IR<10^11 L_solar), Luminous InfraRed
Galaxies (LIRGs, 10^11<L_IR<10^12 L_solar) and UltraLuminous InfraRed Galaxies
(ULIRGs,10^12<L_IR<10^13 L_solar), the AGN fraction becomes 0, 11 and 23 per
cent respectively, showing an increase with total infrared luminosity. However,
by examining the sources' panchromatic SEDs, we conclude that although the AGN
is energetically important in 1 out of 61 objects, all 70micron-selected
galaxies are primarily powered by star-formation.Comment: 20 pages, 14 figures, accepted for publication in MNRA
Linking the X-ray and infrared properties of star-forming galaxies at z < 1.5
We present the most complete study to date of the X-ray emission from star formation in high-redshift (median z = 0.7; z −3 in both hard and soft X-ray bands. From the sources which are star formation dominated, only a small fraction are individually X-ray detected and for the bulk of the sample we calculate average X-ray luminosities through stacking. We find an average soft X-ray to infrared ratio of log ?L SX /L IR ? = −4.3 and an average hard X-ray to infrared ratio of log?L HX /L IR ?=−3.8.WereportthattheX-ray/IRcorrelationisapproximatelylinearthrough the entire range of L IR and z probed and, although broadly consistent with the local (z < 0.1) one, it does display some discrepancies. We suggest that these discrepancies are unlikely to be physical, i.e. due to an intrinsic change in the X-ray properties of star-forming galaxies with cosmic time, as there is no significant evidence for evolution of the L X /L IR ratio with redshift. Instead, they are possibly due to selection effects and remaining AGN contamination.
We also examine whether dust obscuration in the galaxy plays a role in attenuating X-rays from star formation, by investigating changes in the L X /L IR ratio as a function of the average dust temperature. We conclude that X-rays do not suffer any measurable attenuation in the host galaxy
The incidence of myelodysplastic syndromes in Western Greece is increasing.
Descriptive epidemiology of the myelodysplastic syndromes (MDS) is always interesting and may reveal time-dependent and geographical variations, as well as occupational exposure. Epidemiological data in Greece are not available by now. We have collected and analyzed medical records of all patients with a documented diagnosis of MDS, performed by an expert hematologist and/or hematopathologist, in the geographical area of Western Greece, during the 20-year period, defined between 1990 and 2009. We have then calculated and described demographic and clinical features of the diagnosed MDS patient population, and assessed the incidence and prevalence rates of MDS in Western Greece, during the above-mentioned period. A total of 855 patients with newly diagnosed MDS have been identified. Refractory anemia was the most common subtype in both FAB and WHO classification systems and in both genders. Del-5q and RARS were more commonly encountered among females, and the dysplastic subtype of chronic myelomonocytic leukemia among males. Trisomy 8 was the most common single cytogenetic abnormality. The crude mean annual incidence rate of MDS was 6.0 per 100,000 inhabitants aged ≥15 years old (all subtypes according to FAB), and it was 4.8 per 100,000 when CMML and RAEB-T were excluded. Crude incidence rate was higher in rural than in urban areas, but this finding was not confirmed after age standardization. Age-standardized mean annual incidence rate in men was 7.9/100,000 and in women 3.4/100,000. A continuously increasing incidence rate of MDS has been observed throughout the study period
The incidence of obscuration in active galactic nuclei
We study the incidence of nuclear obscuration on a complete sample of 1310
AGN selected on the basis of their rest-frame 2-10 keV X-ray flux from the
XMM-COSMOS survey, in the redshift range 0.3<z<3.5. We classify the AGN as
obscured or un-obscured on the basis of either the optical spectral properties
and the overall SED or the shape of the X-ray spectrum. The two classifications
agree in about 70% of the objects, and the remaining 30% can be further
subdivided into two distinct classes: at low luminosities X-ray un-obscured AGN
do not always show signs of broad lines or blue/UV continuum emission in their
optical spectra, most likely due to galaxy dilution effects; at high
luminosities broad line AGN may have absorbed X-ray spectra, which hints at an
increased incidence of small-scale (sub-parsec) dust-free obscuration. We
confirm that the fraction of obscured AGN is a decreasing function of the
intrinsic X-ray luminosity, while the incidence of absorption shows significant
evolution only for the most luminous AGN, which appear to be more commonly
obscured at higher redshift. We find no significant difference between the mean
stellar masses and star formation rates of obscured and un-obscured AGN hosts.
We conclude that the physical state of the medium responsible for obscuration
in AGN is complex, and mainly determined by the radiation environment (nuclear
luminosity) in a small region enclosed within the gravitational sphere of
influence of the central black hole, but is largely insensitive to the wider
scale galactic conditions.Comment: 18 pages, 17 figures, 2 tables. Accepted for publication by MNRA
- …