942 research outputs found
"Boring formal methods" or "Sherlock Holmes deduction methods"?
This paper provides an overview of common challenges in teaching of logic and
formal methods to Computer Science and IT students. We discuss our experiences
from the course IN3050: Applied Logic in Engineering, introduced as a "logic
for everybody" elective course at at TU Munich, Germany, to engage pupils
studying Computer Science, IT and engineering subjects on Bachelor and Master
levels. Our goal was to overcome the bias that logic and formal methods are not
only very complicated but also very boring to study and to apply. In this
paper, we present the core structure of the course, provide examples of
exercises and evaluate the course based on the students' surveys.Comment: Preprint. Accepted to the Software Technologies: Applications and
Foundations (STAF 2016). Final version published by Springer International
Publishing AG. arXiv admin note: substantial text overlap with
arXiv:1602.0517
Gender, mood, and working-memory
Diese Dissertation untersucht in zwei Studien mittels fMRT a) den Einfluss von Geschlecht und Sexualhormonen auf die FĂ€higkeit, mental Objekte im visuell-rĂ€umlichen ArbeitsgedĂ€chtnis zu rotieren und b) die Bedeutung klinisch relevanter Depression fĂŒr eine verbale ArbeitsgedĂ€chtnisaufgabe. Die erste Studie zeigt, dass die neuronalen Netzwerke fĂŒr die mentale Rotationsaufgabe bei Frauen und MĂ€nnern zwar qualitativ sehr Ă€hnlich ausgeprĂ€gt sind, es jedoch innerhalb dieses Netzwerkes signifikante Unterschiede zwischen MĂ€nnern und Frauen in AbhĂ€ngigkeit von der Zyklusphase gibt. Die zweite Studie findet bei remittierten, unipolar depressiven Patienten auch nach Abklingen der affektiven Symptomatik eine abnorme Aktivierung des cingulĂ€ren Cortex. Zusammenfassend wird gezeigt, dass kognitive Funktionsbereiche, insbesondere das verbale und visuell-rĂ€umliche ArbeitsgedĂ€chtnis, durch Faktoren wie Geschlecht und hormonelle EinflĂŒsse sowie durch affektive Erkrankungen beeinflusst werden können
Hardness of Sparse Sets and Minimal Circuit Size Problem
We develop a polynomial method on finite fields to amplify the hardness of
spare sets in nondeterministic time complexity classes on a randomized
streaming model. One of our results shows that if there exists a
-sparse set in that does not have any
randomized streaming algorithm with updating time, and
space, then , where a -sparse set is a language that has at
most strings of length . We also show that if MCSP is -hard
under polynomial time truth-table reductions, then
Irradiation study of a fully monolithic HV-CMOS pixel sensor design in AMS 180 nm
High-Voltage Monolithic Active Pixel Sensors (HV-MAPS) based on the 180 nm
HV-CMOS process have been proposed to realize thin, fast and highly integrated
pixel sensors. The MuPix7 prototype, fabricated in the commercial AMS H18
process, features a fully integrated on-chip readout, i.e. hit-digitization,
zero suppression and data serialization. It is the first fully monolithic
HV-CMOS pixel sensor that has been tested for the use in high irradiation
environments like HL-LHC. We present results from laboratory and test beam
measurements of MuPix7 prototypes irradiated with neutrons (up to
) and protons (up to ) and compare the performance with non-irradiated
sensors. Efficiencies well above 90 % at noise rates below 200 Hz per pixel are
measured. A time resolution better than 22 ns is measured for all tested
settings and sensors, even at the highest irradiation fluences. The data
transmission at 1.25 Gbit/s and the on-chip PLL remain fully functional
Divergent drivers of the microbial methane sink in temperate forest and grassland soils
Aerated topsoils are important sinks for atmospheric methane (CH4) via oxidation by CH4âoxidizing bacteria (MOB). However, intensified management of grasslands and forests may reduce the CH4 sink capacity of soils. We investigated the influence of grassland landâuse intensity (150 sites) and forest management type (149 sites) on potential atmospheric CH4 oxidation rates (PMORs) and the abundance and diversity of MOB (with qPCR) in topsoils of three temperate regions in Germany. PMORs measurements in microcosms under defined conditions yielded approximately twice as much CH4 oxidation in forest than in grassland soils. High landâuse intensity of grasslands had a negative effect on PMORs (â40%) in almost all regions and fertilization was the predominant factor of grassland landâuse intensity leading to PMOR reduction by 20%. In contrast, forest management did not affect PMORs in forest soils. Upland soil cluster (USC)âα was the dominant group of MOBs in the forests. In contrast, USCâÎł was absent in more than half of the forest soils but present in almost all grassland soils. USCâα abundance had a direct positive effect on PMOR in forest, while in grasslands USCâα and USCâÎł abundance affected PMOR positively with a more pronounced contribution of USCâÎł than USCâα. Soil bulk density negatively influenced PMOR in both forests and grasslands. We further found that the response of the PMORs to pH, soil texture, soil water holding capacity and organic carbon and nitrogen content differ between temperate forest and grassland soils. pH had no direct effects on PMOR, but indirect ones via the MOB abundances, showing a negative effect on USCâα, and a positive on USCâÎł abundance. We conclude that reduction in grassland landâuse intensity and afforestation has the potential to increase the CH4 sink function of soils and that different parameters determine the microbial methane sink in forest and grassland soils.Deutsche Forschungsgemeinschaft
http://dx.doi.org/10.13039/501100001659ESFMinistry of Education, Science and Culture of MecklenburgâWestern PomeraniaPeer Reviewe
The MuPix Telescope: A Thin, high Rate Tracking Telescope
The MuPix Telescope is a particle tracking telescope, optimized for tracking
low momentum particles and high rates. It is based on the novel High-Voltage
Monolithic Active Pixel Sensors (HV-MAPS), designed for the Mu3e tracking
detector. The telescope represents a first application of the HV-MAPS
technology and also serves as test bed of the Mu3e readout chain. The telescope
consists of up to eight layers of the newest prototypes, the MuPix7 sensors,
which send data self-triggered via fast serial links to FPGAs, where the data
is time-ordered and sent to the PC. A particle hit rate of 1 MHz per layer
could be processed. Online tracking is performed with a subset of the incoming
data. The general concept of the telescope, chip architecture, readout concept
and online reconstruction are described. The performance of the sensor and of
the telescope during test beam measurements are presented.Comment: Proceedings TWEPP 2016, 8 pages, 7 figure
Solving satisfiability problems by fluctuations: The dynamics of stochastic local search algorithms
Stochastic local search algorithms are frequently used to numerically solve
hard combinatorial optimization or decision problems. We give numerical and
approximate analytical descriptions of the dynamics of such algorithms applied
to random satisfiability problems. We find two different dynamical regimes,
depending on the number of constraints per variable: For low constraintness,
the problems are solved efficiently, i.e. in linear time. For higher
constraintness, the solution times become exponential. We observe that the
dynamical behavior is characterized by a fast equilibration and fluctuations
around this equilibrium. If the algorithm runs long enough, an exponentially
rare fluctuation towards a solution appears.Comment: 21 pages, 18 figures, revised version, to app. in PRE (2003
MapRecorder : analysing real-world usage of mobile map applications
This work was supported by Volkswagen Foundation [Lichtenbergprofessorship].Millions of people use mobile map applications like Google Maps on a regular basis. However, despite these applications' ubiquity, the literature contains very little information about how these applications are used in the real world. As such, many researchers and practitioners seeking to improve mobile map applications may not be able to identify important challenges and may miss major opportunities for innovation. To address this paucity of usage information, we collected and analysed data during unsupervised usage of Google Maps by replacing the standard application with a wrapped version called MapRecorder. In two studies we recorded data from locals and tourists using our application and collected over 580 minutes of actual application usage from 34 users, spanning 555 unique sessions. We identify typical usage scenarios, observe a large amount of map exploration and elucidate generalisable interaction patterns.Peer reviewe
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