The issue of Automatic Relevance Determination (ARD) has attracted attention over the last decade for the sake of efficiency and ac- curacy of classifiers, and also to extract knowledge from discriminant functions adapted to a given data set. Based on Learning Vector Quanti- zation (LVQ), we recently proposed an approach to ARD utilizing genetic al...
Martin Golz David Sommer
Karel Marsalek René Gerber Martin Golz Alexander Gundel
A novel approach for Microsleep Event detection is presented. This is achieved based on multisensor electroencephalogram (EEG) and electrooculogram (EOG) measurements recorded during an overnight driving simulation task. First, using video clips of the driving, clear Microsleep (MSE) and Non-Microsleep (NMSE) events were identified. Next, segments...
David Sommer Mo Chen Martin Golz Danilo P. Mandic
An overview of data fusion approaches is provided from the signal processing viewpoint. The general concept of data fusion is introduced, together with the related architectures, algorithms and performance aspects. Benefits of such an approach are highlighted and potential applications are identified. Case studies illustrate the merits of applying...
Danilo P. Mandic Dragan Obradovic Anthony Kuh Jonathon Chambers
David Sommer Martin Golz LE Walther C Eurich
An adaptive biosignal analysis system for the detection of microsleep events is presented. The system was applied to the electroencephalogram and electrooculogram recorded of 23 young volunteers while performing monotonic overnight driving in our real car driving simulation laboratory. Biosignals during clear observable microsleep and non-microslee...
Martin Golz David Sommer Danilo Mandic
The aim of the present study was to evaluate if the occurrence of microsleep events in an overnight driving simulation task can be predicted by the score on the Karolinska sleepiness scale assessed before or after the drive. Twelve healthy volunteers performed the driving simulation task in five test runs separated by breaks of approximately 10 min...
Stefanie Richter Karel Marsalek David Sommer Alexander Gundel
We compare two comprehensive classification algorithms, support vector machines (SVM) and several variants of learning vector quantization (LVQ), with respect to different validation methods. The generalization ability is estimated by “multiple-hold-out” (MHO) and by “leave-one-out” (LOO) cross v method. The ξα-method, a further estimation method,...
David Sommer Martin Golz
In a preliminary study an Error Back Propagation Network (EBPN) has been applied for the determination of optical constants of thin Palladium films using reflectometric and ellipsometric data sets as network inputs. First results based on angle scan data sets confirm that EBPN is a viable tool for solving the inverse problem of determining thin fil...
Udo Trutschel Uwe Langbein M Markert Doos Tabarz
This paper introduces modifications of Self-Organizing Maps allowing imputation and classification of data containing missing values. The robustness of the proposed modifications is shown using experimental results of a standard data set. A comparison to modified Fuzzy cluster methods (Timm et al., 2002) is presented. Both methods performed better...
David Sommer Tobias Grimm Martin Golz
EEG segments recorded during microsleep events were transformed to the frequency domain and were subsequently clustered without the common summation of power densities in spectral bands. Any knowledge about the number of clusters didn’t exist. The hierarchical agglomerative clustering procedures were terminated with several standard measures of int...
David Sommer Martin Golz
ABSTRACT: Slow eye movements were detected in the electro- oculogram of eleven subjects during nighttime driving simulations. Simultaneously recorded EEG segments were transformed to the frequency domain with discrete Fourier transform. A subsequent clustering without the common summation in spectral bands sought to analyze how many types of EEG se...
David Sommer Martin Golz Udo Trutschel Martin Moore-Ede
The eye gaze point and the pupil size of five subjects were recorded during an overnight driving simulation task. By scoring the recorded videos, clear microsleep events (MSE) and clear non-microsleep events were detected, and the measured signals in the preceding five seconds were analyzed. The spectral densities of these segments were classified...
Martin Golz David Sommer A. Seyfarth Martin Moore-Ede
Impaired alertness accompanied by short microsleep episodes is a frequently reported phenomenon in all areas of modern life. A microsleep episode can be defined as a somewhat unexpected short episode of sleep (between 2 and 30 seconds that occurs in the midst of ongoing wakeful activity .
Udo Trutschel Rainer Guttkuhn Chris Ramsthaler Martin Moore-Ede
Attenuated-total-reflection spectra obtained by the optical excitation of surface plasmon polaritons can be interpreted in terms of two different virtual modes. It is shown that the HWHM of absorptance as a function of the incidence angle can be described by the decay constant of one of the modes. The attenuated-total-reflection resonance angle, on...
Manfred Klopfleisch Martin Golz Udo Trutschel
We propose an improved method for attenuated-total-reflection experiments in the Otto configuration. This new technique overcomes the difficulties that arise from the nonuniformity of the air coupling gap. Thus attenuated-total-reflection measurements, under ideal adapted conditions, can be made for a wide range of wavelengths. The determination of...
Manfred Klopfleisch Martin Golz
A nonlinear matrix formalism that allows the calculation of the optical field within a nonlinear multilayer system is presented. Taking advantage of this technique, the field profiles are calculated and the dispersion relation of nonlinear guided waves in such configurations is derived. The numerical results reveal that several field profiles occur...
Udo Trutschel F. Lederer Martin Golz
A configuration for the excitation of surface plasmons in the infrared spectral region using ATR but without a coupling prism is presented. The technique is to place between the metal and the air a material which has a lower index of refraction than air so that the standard total internal reflection geometry is recovered. Experiments are performed...
A. Roeseler Martin Golz Udo Trutschel M. Abraham
A transfer matrix formalism is used to treat in a general way the optical response of different kind of metal superlattices. The dispersion relation of infinite and semi-infinite superlattices and the reflectivity of semiinfinite superlattices are calculated. Spatial dispersion is included via additional boundary conditions. Each unit cell of the s...
Udo Trutschel Martin Golz M. Abraham
A device with optical bistability is proposed well adapted to planar technology in the framework of integrated optics. The device is composed by a dielectric layer of Al2O3 deposited onto an InSb waveguide with defocussing Kerr-nonlinearity and a metal substrate. It works at the wavelength of 10.6 μm, where the refractive index of Al2O3 is lower th...
Udo Trutschel Martin Golz M. Abraham
Surface plasmons (SP) are collective excitations of the electron gas bounded to the interface between a surface plasmon active material and a dielectric. Such materials are characterized by a dominating contribution of the quasi-free electrons to the optical properties. In contrast to electron energy loss spectroscopy (EELS), surface plasmons are i...
M. Abraham M. Klopfleisch Martin Golz A. Tadjeddine
Short segments of EEG, EOG and pupil diame-ter signals recorded in overnight driving simulation ses-sions of 21 young subjects were extracted during micro-sleep events and during fatigue states, where driving is still possible. Both classes were found by video based subjec-tive scoring of experts. Estimated spectral power densities were used as inp...
Martin Golz David Sommer
Posturography is widely used for quantitative assessment of balance control function in patients with vestibular dysfunction. The objective of this study was to investigate whether the postural control of normal subjects is influenced by a medium dose of alcohol. 51 young volunteers without known vestibular diseases examined four 40-seconds trials...
Martin Golz David Sommer Leif Erik Walther
Für die individuelle Anpassung biomathematischer Modelle des menschlichen Schlaf-Wach-Zyklus ist es erforderlich, physiologische Größen zu messen, aus denen die freien Modellparameter abgeleitet werden können. Es ist bekannt, dass verschiedene Zeit- und Frequenzbereichs-Merkmale des Tachogramms deutliche zirkadiane Schwankungen aufweisen. Die zirka...
Christian Heinze Udo Trutschel David Sommer Martin Golz
Danilo Mandic Martin Golz Anthony Kuh Toshihisa Tanaka
