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This paper analyses optimal subband beamforming performance mainly aimed at speech enhancement and acoustic echo suppression for personal communication devices, personal computers and wireless cellular telephones. The focus is on theoretical limits of finite impulse response (FIR) beamformers for spatially spread sources in the array near-field. Performance of the Wiener solution is compared to th
This paper presents a new microphone array method to enhance speech signals in a noisy reverberant environment. A time-delay estimation method is used for the speech source localization. The robustness of the localization method in high noise levels is provided by a subband Kurtosis-weighted structure. The estimated inter-sensor time-delays are directly used in an adaptive soft-constrained subband
In this chapter, speech enhancement and echo cancellation for hands-free mobile telephony are discussed. A number of microphone array methods have been tested and results from car measurements are given. Traditional methods such as linearly constrained beamforming and generalized sidelobe cancelers are discussed as well as array gain optimization methods. An in situ calibrated method which gives a
The linear filtering, prediction and smoothing problems as well as the linear quadratic control problems can very generally be formulated as operator equations using basic linear algebra.The equations are of Fredholm type II, and they are difficult to solve directly.It is shown how the operator can be factorized into two Volterra operators using a matrix Riccati equation. Recursive solution of the
Solid-phase extraction (SPE) is one the most common sample preparation techniques in many laboratories. Optimization of analyte specificity and recovery is crucial for high-sensitivity detection and analysis robustness/reproducibility. The optimization process usually starts with screening for a suitable extraction phase for a certain analyte (e.g. reversed-phase or HILIC) or if the extraction pha
The Extended Flipped Classroom (EFC) concept was developed for and applied to a selected group of students studying at the Technology Management programme, a cross-disciplinary master programme at Lund University, Sweden, in 2014. The main driving force for its development was a strong believe that the university can provide the students with, not only knowledge in various subject fields, but also
We provide necessary and sufficient structural conditions for multistationarity and oscillations in aggregate monotone systems, defined as the interconnection of stable monotone components. Our classification is based on the presence of exclusively positive or exclusively negative cycles in the system aggregate graph, whose nodes are the monotone subsystems. The results presented here scale up the
NURBS (Non-uniform rational B-splines) surfaces are the standard freeform representation in Computer- Aided Design (CAD) applications. Rendering NURBS surfaces accurately while they are interactively manipulated and deformed is a challenging task. In order to achieve it, the elimination from pipeline in early stages of back-facing surfaces or surface pieces is a key advantage. Furthermore, an effe
Purpose of review We aim to review the most interesting recent advances on the clinical aspects of continuous dopaminergic stimulation in Parkinson's disease. Recent findings Several large, open-label studies have presented data that are in line with the randomized controlled trial on L-dopa-carbidopa intestinal gel infusion, which shows that a continuous drug delivery can improve motor fluctuatio
This work presents a Scheimpflug lidar system which was employed for atmospheric aerosol monitoring in southern Sweden. Atmospheric aerosol fluctuation was observed around rush-hour. The extinction coefficient over 6 km was retrieved, i.e., 0.15 km-1, by employing the slop-method during the time when the atmosphere was relatively homogenous. The measurements successfully demonstrate the potential
We have critically examined and compared various ways to obtain standard harmonic molecular mechanics (MM) force-field parameters for metal sites in proteins, using the 12 most common Zn2+ sites as test cases. We show that the parametrization of metal sites is hard to treat with automatic methods. The choice of method is a compromise between speed and accuracy and therefore depends on the intended
We developed an analytical theory for the many-body potential of mean force (POMF) between N spheres immersed in a continuum chain fluid. The theory is almost exact for a T polymer solution in the protein limit (small particles, long polymers), where N-body effects are important. Polydispersity in polymer length according to a SchulzFlory distribution emerges naturally from our analysis, as does t
We present here a version of the existence and uniqueness result of time periodic solutions to the viscous Burgers' equation with irregular forcing terms (with Sobolev regularity -1 in space). The key result here is an a priori estimate which is simpler than the previously treated case of forcing terms with regularity -1/2 in time.
Abstract in UndeterminedSignal detection algorithms providing likelihood informationfor coded spatial-multiplexing multiple-input multipleoutput(MIMO) wireless communication system pose a criticaldesign challenge due to their prohibitively high computationalcomplexity. In this paper, we present a low-complexity soft-outputdetection algorithm by adopting four implementation-friendlyalgorithm-level
Information can be provided by studying and evaluating past emergencies and the response in connection to them. This information would then be useful in efforts directed at preventing, mitigating and/or preparing for future emergencies. However, the analysis and evaluation of emergency response operations is not an easy task, especially when the operation involves several cooperating actors (e.g.
To evaluate late outcomes after fenestrated endovascular aortic repair (f-EVAR) in a tertiary European referral center.
The gas produced in a biomass gasifier contains high amounts of tars which have to be removed prior to downstream utilization. Calcined dolomite is catalytically active for tar cracking reactions and resistant to sulfur poisoning. In this study, calcined dolomite was used as bed material in a reverse-flow reactor for cracking of tars in a model synthesis gas. 1-methylnaphthalene was used as model
