74 research outputs found
Psychometric properties of an interviewer-administered version of the Kessler Psychological Distress scale (K10) among Dutch, Moroccan and Turkish respondents
Sons, Lt
Multistatic micro‐Doppler radar feature extraction for classification of unloaded/loaded micro‐drones
This paper presents the use of micro-Doppler signatures collected by a multistatic radar to detect and discriminate between micro-drones hovering and flying while carrying different payloads, which may be an indication of unusual or potentially hostile activities. Different features have been extracted and tested, namely features related to the Radar Cross Section of the micro-drones, as well as the Singular Value Decomposition (SVD) and centroid of the micro-Doppler signatures. In particular, the added benefit of using multistatic information in comparison with conventional radar is quantified. Classification performance when identifying the weight of the payload that the drone was carrying while hovering was found to be consistently above 96% using the centroid-based features and multistatic information. For the non-hovering scenarios classification results with accuracy above 95% were also demonstrated in preliminary tests in discriminating between three different payload weights
Increased cell division but not thymic dysfunction rapidly affects the T-cell receptor excision circle content of the naive T cell population in HIV-1 infection
Recent thymic emigrants can be identified by T cell receptor excision
circles (TRECs) formed during T-cell receptor rearrangement.
Decreasing numbers of TRECs have been observed with
aging and in human immunodeficiency virus (HIV)-1 infected
individuals, suggesting for thymic impairment. Here, we show
that in healthy individuals, declining thymic output will affect
the TREC content only when accompanied by naive T-cell division.
The rapid decline in TRECs observed during HIV-1 infection
and the increase following HAART are better explained not
by thymic impairment, but by changes in peripheral T-cell division
rates. Our data indicate that TREC content in healthy individuals
is only indirectly related to thymic output, and in HIV-1
infection is mainly affected by immune activation
Personnel recognition based on multistatic micro‐Doppler and singular value decomposition features
The Replica Limit of Unitary Matrix Integrals
We investigate the replica trick for the microscopic spectral density,
, of the Euclidean QCD Dirac operator. Our starting point is the
low-energy limit of the QCD partition function for fermionic flavors (or
replicas) in the sector of topological charge . In the domain of the
smallest eigenvalues, this partition function is simply given by a U(n) unitary
matrix integral. We show that the asymptotic behavior of for is obtained from the limit of this integral. The smooth
contributions to this series are obtained from an expansion about the replica
symmetric saddle-point, whereas the oscillatory terms follow from an expansion
about a saddle-point that breaks the replica symmetry. For we recover
the small- logarithmic singularity of the resolvent by means of the replica
trick. For half integer , when the saddle point expansion of the U(n)
integral terminates, the replica trick reproduces the exact analytical result.
In all other cases only an asymptotic series that does not uniquely determine
the microscopic spectral density is obtained. We argue that bosonic replicas
fail to reproduce the microscopic spectral density. In all cases, the exact
answer is obtained naturally by means of the supersymmetric method.Comment: 28 pages, 2 figures, Late
Clinical characteristics of women captured by extending the definition of severe postpartum haemorrhage with 'refractoriness to treatment': a cohort study
Background: The absence of a uniform and clinically relevant definition of severe postpartum haemorrhage
hampers comparative studies and optimization of clinical management. The concept of persistent postpartum
haemorrhage, based on refractoriness to initial first-line treatment, was proposed as an alternative to common
definitions that are either based on estimations of blood loss or transfused units of packed red blood cells
(RBC). We compared characteristics and outcomes of women with severe postpartum haemorrhage captured
by these three types of definitions.
Methods: In this large retrospective cohort study in 61 hospitals in the Netherlands we included 1391 consecutive
women with postpartum haemorrhage who received either ≥4 units of RBC or a multicomponent transfusion. Clinical
characteristics and outcomes of women with severe postpartum haemorrhage defined as persistent postpartum
haemorrhage were compared to definitions based on estimated blood loss or transfused units of RBC within 24 h
following birth. Adverse maternal outcome was a composite of maternal mortality, hysterectomy, arterial embolisation
and intensive care unit admission.
Results: One thousand two hundred sixty out of 1391 women (90.6%) with postpartum haemorrhage fulfilled the
definition of persistent postpartum haemorrhage. The majority, 820/1260 (65.1%), fulfilled this definition within 1 h
following birth, compared to 819/1391 (58.7%) applying the definition of ≥1 L blood loss and 37/845 (4.4%) applying
the definition of ≥4 units of RBC. The definition persistent postpartum haemorrhage captured 430/471 adverse maternal
outcomes (91.3%), compared to 471/471 (100%) for ≥1 L blood loss and 383/471 (81.3%) for ≥4 units of RBC. Persistent
postpartum haemorrhage did not capture all adverse outcomes because of missing data on timing of initial, first-line
treatment.
Conclusion: The definition persistent postpartum haemo
Innovative SAR/MTI Concepts for Digital Radar
Contemporary military operations make high demands on the capabilities of sensors. Modern sensors must have the capability to perform different tasks, such as ground surveillance and target tracking, simultaneously. Multifunction digital radar may provide the required capabilities and meet the stringent weight, size, and power constraints. One of the special features of digital radar is ability to form multiple simultaneous beams for each sweep. Conceptual SAR and MTI mode designs, fully exploiting this special feature, will be described
Estimating cloud liquid water content from radar reflectivity for stratocumulus clouds during the Cloud Lidar and Radar Experiment
In order to obtain the cloud liquid water content from radar observations, a relationship between the radar reflectivity (Z) and the cloud liquid water content (LWC) must be found. In literature, empirical Z-LWC have been proposed. However these relationships ignore drizzle-sized droplets. Since the clouds were drizzling during Clare these relationships will not be valid for the Clare data set. In this report, a Z-LWC relation valid for clouds containing drizzle-sized droplets is developed based on the CLARE in-situ measurements and radar observations. The CLARE measurement campaign took place near Chilbolton (U.K.), between October 5th and October 23rd 1998.IRCTRElectrical Engineering, Mathematics and Computer Scienc
SAR: A Novel Application for FM-CW Radars
For small-scale earth observation applications, there ia a special interest in low-cost, high-resolution imaging radars small, enough to be operated from small, possibly unmanned aircraft. The combination of FM-CW technology and the high resolution of SAR systems should result in such a small, cost-effective imaging radar. In a new project the feasibility of FM-CW SAR is studied. SAR algorithms that take the typical characteristics of FM-CW signals into account will be developed. Furthermore, a low-cost demonstrator will be built. This demonstrator should prove the feasibility of FM-CW SAR and provide real test data to validate the processing algorithms and the design models. The demonstrator will be based on commercially available components. The system performance will be limited, but is sufficient to prove the feasibility of FM-CW SA
Radar Micro-Doppler Feature Extraction Using the Singular Value Decomposition
Abstract—The micro-Doppler spectrogram depends on parts of a target moving and rotating in addition to the main body motion (e.g., spinning rotor blades) and is thus characteristic for the type of target. In this study, the micro-Doppler spectrogram is exploited to distinguish between birds and small unmanned aerial vehicles (UAVs). The focus hereby is on micro-Doppler features enabling fast classification of birds and mini-UAVs. In a second classification step, it is desired to exploit micro-Doppler features to further characterize the type of UAV, e.g., fixed-wing vs. rotary-wing. In this paper, potentially robust features are discussed supporting the first classification step, i.e., separation of birds and UAVs. The Singular Value Decomposition seems a powerful tool to extract such features, since the information content of the micro-Doppler spectrogram is preserved in the singular vectors. In the paper, some examples of micro-Doppler feature extraction via Singular Value Decomposition are given
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