25,641 research outputs found
Slow light in paraffin-coated Rb vapor cells
We present preliminary results from an experimental study of slow light in
anti-relaxation-coated Rb vapor cells, and describe the construction and
testing of such cells. The slow ground state decoherence rate allowed by coated
cell walls leads to a dual-structured electromagnetically induced transparency
(EIT) spectrum with a very narrow (<100 Hz) transparency peak on top of a broad
pedestal. Such dual-structure EIT permits optical probe pulses to propagate
with greatly reduced group velocity on two time scales. We discuss ongoing
efforts to optimize the pulse delay in such coated cell systems.Comment: 6 pages, 6 figures, submitted to Journal of Modern Optic
Knowledge Graph Completion to Predict Polypharmacy Side Effects
The polypharmacy side effect prediction problem considers cases in which two
drugs taken individually do not result in a particular side effect; however,
when the two drugs are taken in combination, the side effect manifests. In this
work, we demonstrate that multi-relational knowledge graph completion achieves
state-of-the-art results on the polypharmacy side effect prediction problem.
Empirical results show that our approach is particularly effective when the
protein targets of the drugs are well-characterized. In contrast to prior work,
our approach provides more interpretable predictions and hypotheses for wet lab
validation.Comment: 13th International Conference on Data Integration in the Life
Sciences (DILS2018
Temptation of academic medicine: Second alma mater and "shared employment" concepts as possible way out?
LTE uplink MIMO receiver with low complexity interference cancellation
In LTE/LTE-A uplink receiver, frequency
domain equalizers (FDE) are adopted to achieve good
performance. However, in multi-tap channels, the residual
inter-symbol and inter-antenna interference still exist after
FDE and degrade the performance. Conventional interference
cancellation schemes can minimize this interference
by using frequency domain interference cancellation.
However, those schemes have high complexity and large
feedback latency, especially when adopting a large number
of iterations. These result in low throughput and require a
large amount of resource in software defined radio implementation.
In this paper, we propose a novel low complexity
interference cancellation scheme to minimize the
residual interference in LTE/LTE-A uplink. Our proposed
scheme can bring about 2 dB gains in different channels,
but only adds up to 7.2 % complexity to the receiver. The
scheme is further implemented on Xilinx FPGA. Compared
to other conventional interference cancellation schemes,
our scheme has less complexity, less data to store, and
shorter feedback latency.Renesas MobileTexas IntrumentsXilinxSamsungHuaweiNational Science Foundation (NSF
PCV50 EFFICACY AND SOCIOECONOMIC RELEVANCE OF HAWTHORN EXTRACT (CRATAEGUS) WSÂź 1442 IN THE TREATMENT OF NYHA II CHF PATIENTSâRESULTS FROM A PROSPECTIVE THREE-YEAR PHARMACOECONOMIC STUDY
Testing Ecological Theory with Lianas
Lianas constitute a diverse polyphyletic plant group that is advancing our understanding of ecological theory. Specifically, lianas are providing new insights into the mechanisms that control plant distribution and diversity maintenance. For example, there is now evidence that a single, scalable mechanism may explain local, regional, and panâtropical distribution of lianas, as well as the maintenance of liana species diversity. The ability to outcompete trees under dry, stressful conditions in seasonal forests provides lianas a growth advantage that, over time, results in relatively high abundance in seasonal forests and low abundance in aseasonal forests. Lianas may also gain a similar growth advantage following disturbance, thus explaining why liana density and diversity peak following disturbance at the local, forest scale. The study of ecology, however, is more than the effect of the environment on organisms; it also includes the effects of organisms on the environment. Considerable empirical evidence now indicates that lianas substantially alter their environment by consuming resources, suppressing tree performance, and influencing emergent properties of forests, such as ecosystem functioning, plant and animal diversity, and community composition. These recent studies using lianas are transcending classical tropical ecology research and are now providing novel insights into fundamental ecological theory
Genetic algorithms with self-organizing behaviour in dynamic environments
Copyright @ 2007 Springer-VerlagIn recent years, researchers from the genetic algorithm (GA) community have developed several approaches to enhance the performance of traditional GAs for dynamic optimization problems (DOPs). Among these approaches, one technique is to maintain the diversity of the population by inserting random immigrants into the population. This chapter investigates a self-organizing random immigrants scheme for GAs to address DOPs, where the worst individual and its next neighbours are replaced by random immigrants. In order to protect the newly introduced immigrants from being replaced by fitter individuals, they are placed in a subpopulation. In this way, individuals start to interact between themselves and, when the fitness of the individuals are close, one single replacement of an individual can affect a large number of individuals of the population in a chain reaction. The individuals in a subpopulation are not allowed to be replaced by individuals of the main population during the current chain reaction. The number of individuals in the subpopulation is given by the number of individuals created in the current chain reaction. It is important to observe that this simple approach can take the system to a self-organization behaviour, which can be useful for GAs in dynamic environments.Financial support was obtained from FAPESP (Proc. 04/04289-6)
Introduction: studies on the learning process in the one-day, one-problem approach to problem-based learning
Size Matters: Microservices Research and Applications
In this chapter we offer an overview of microservices providing the
introductory information that a reader should know before continuing reading
this book. We introduce the idea of microservices and we discuss some of the
current research challenges and real-life software applications where the
microservice paradigm play a key role. We have identified a set of areas where
both researcher and developer can propose new ideas and technical solutions.Comment: arXiv admin note: text overlap with arXiv:1706.0735
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