2,378 research outputs found
Implementation of a digital control unit for a space probe using mosfets
Implementation of digital control unit for space probe using MOSFET
Using simulation studies to evaluate statistical methods
Simulation studies are computer experiments that involve creating data by
pseudorandom sampling. The key strength of simulation studies is the ability to
understand the behaviour of statistical methods because some 'truth' (usually
some parameter/s of interest) is known from the process of generating the data.
This allows us to consider properties of methods, such as bias. While widely
used, simulation studies are often poorly designed, analysed and reported. This
tutorial outlines the rationale for using simulation studies and offers
guidance for design, execution, analysis, reporting and presentation. In
particular, this tutorial provides: a structured approach for planning and
reporting simulation studies, which involves defining aims, data-generating
mechanisms, estimands, methods and performance measures ('ADEMP'); coherent
terminology for simulation studies; guidance on coding simulation studies; a
critical discussion of key performance measures and their estimation; guidance
on structuring tabular and graphical presentation of results; and new graphical
presentations. With a view to describing recent practice, we review 100
articles taken from Volume 34 of Statistics in Medicine that included at least
one simulation study and identify areas for improvement.Comment: 31 pages, 9 figures (2 in appendix), 8 tables (1 in appendix
Convergence and Creativity in Telematic Performance: The Adding Machine
Entre diciembre de 2005 y marzo de 2007, el Departamento de Arte Dramático y el programa Multimedia de la universidad de Bradley, la universidad de Waterloo y la universidad de Central Florida desarrollaron un acontecimiento teatral único que agrupaba a cuatro artistas, alrededor de cien estudiantes de siete departamentos universitarios y una ingente cantidad de tecnología de la comunicación. La versión completa de la representación transducida de la obra expresionista The Adding Machine, de Elmer Rice, integraba decorados virtuales, actuaciones telemáticas en vivo y tiempo real a través de Internet2, grabación de vídeo analógica, actores digitales, fotografías, gráficos y sonido. Este artículo presenta y analiza algunos de los descubrimientos artísticos, dramatúrgicos y técnicos realizados y ofrece una reflexión teórica sobre las representaciones telemáticas convergentes.Between December 2005 and March 2007, the Department of Theatre Arts and the Multimedia Program at Bradley University, USA; the University of Waterloo, Canada; and the University of Central Florida, USA developed a unique theatrical enterprise that encompassed four creative artists, over one hundred students from seven academic departments, and an array of sophisticated rendering and communication technology. The fully mediatized production of Elmer Rice’s expressionistic play The Adding Machine integrated virtual scenery, live, real-time telematic performances facilitated via Internet2, recorded composite video, avatar performers, photographs, graphics and sound. This paper reports and analyses some of the artistic, dramaturgical, and technical discoveries made from the production and offers some theoretical insights about convergent telematic performances
Experience and results of the 1991 MTLRS-1 USSR campaign
The year 1991 was a special year for the mobile laser ranging systems. Due to the scheduled upgrades of the Modular Transportable Laser Ranging Systems, MTLRS#1 and MTLRS#2, neither a WEGENER MEDLAS nor a Crustal Dynamics Project campaign was carried out in 1991. After the successful upgrade of MTLRS#1 in the first half of 1991 the system departed from Wettzell in August to make measurements at two sites in the USSR. In Riga/Latvia, we operated close to the fixed SLR system. In Simeiz/Ucrainea, the place for MTLRS#1 pad was choosen to collocate the two fixed SLR stations in Simeiz (300 m distance to MTLRS#1) and Kazivelli (about 3 km distance)
Bronchoscopy of Lung Cancer
Lung cancer is a leading cancer site in men and women with a high incidence and mortality rate. Most
patients are diagnosed when the disease has already spread. An early, detection and immediate and
accurate histological or cytological diagnosis are essential for a hopeful outcome. In most patients,
bronchoscopy is the method of choice in establishing a suspected lung neoplasm. With the rigid and
flexible method, two complementary techniques are available. The methods bear a very low mortality
rate if sufficient monitoring and resuscitative instrumentation is available. Rigid bronchoscopy
offers the possibility of obtaining large biopsy specimens from the tumorous tissue and provides an
effective tool in the control of major haemorrhage. However, it cannot be used for the inspection of
further peripherally located parts of the bronchial system and needs general anaesthesia. In contrast,
the flexible method can be quickly and readily performed at practically any location using portable
equipment. Bronchi can be inspected up to the 8th order and with bronchial washing, forceps biopsy,
brush biopsy and fluorescence bronchoscopy techniques with a high diagnostic yield are available.
This holds true, especially if these sampling techniques are used as complementary methods
On the formation and evolution of magnetic chemically peculiar stars in the solar neighborhood
In order to put strict observational constraints on the evolutionary status
of the magnetic chemically peculiar stars (CP2) of the upper main sequence, we
have investigated a well established sample of galactic field CP2 objects
within a radius of 200pc from the Sun in the (X,Y) plane. In total, 182 stars
with accurate parallax measurements from the Hipparcos satellite were divided
into Si, SiCr and SrCrEu subgroups based on classification resolution data from
the literature. Primarily, it was investigated if the CP2 phenomenon occurs at
very early stages of the stellar evolution, significantly before these stars
reach 30% of their life-time on the main sequence. This result is especially
important for theories dealing with stellar dynamos, angular momentum loss
during the pre- as well as main sequence and stellar evolutionary codes for CP2
stars. For the calibration of the chosen sample, the well-developed framework
of the Geneva 7-color and Stromgren uvbybeta photometric system was used. We
are able to show that the CP2 phenomenon occurs continuously at the zero age
main sequence for masses between 1.5 and 4.5M(sun}. The magnetic field
strengths do not vary significantly during the evolution towards the terminal
age main sequence. Only the effective temperature and magnetic field strength
seem to determine the kind of peculiarity for those stars. We found several
effects during the evolution of CP2 stars at the main sequence, i.e. there are
two "critical" temperatures where severe changes take place. There is a
transition between Si, SiCr and SrCrEu stars at 10000K whereas a significant
decrease to almost zero of evolved SrCrEu objects with masses below 2.25M(sun)
at 8000K occurs.Comment: 7 pages, 4 figures, accepted by A&
- …