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Search Results: 1 - 10 of 216244 matches for " H.-W. Yim "
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A Six-Month Supplementation of Mulberry, Korean Red Ginseng, and Banaba Decreases Biomarkers of Systemic Low-Grade Inflammation in Subjects with Impaired Glucose Tolerance and Type 2 Diabetes
H.-J. Kim,K.-H. Yoon,M.-J. Kang,H.-W. Yim,K.-S. Lee,V. Vuksan,M.-K. Sung
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/735191
Abstract: We sought the long-term efficacy of traditionally used antidiabetic herbs in controlling blood glucose homeostasis and low-grade inflammation. Ninety-four subjects with either impaired glucose tolerance or mild T2D were randomized either to treatment arm or placebo arm and received 1 : 1 : 1 mixture of ginseng roots, mulberry leaf water extract, and banaba leaf water extract (6 g/d) for 24 weeks. Oral 75 g glucose tolerance test was performed to measure glucose and insulin responses. Blood biomarkers of low-grade inflammation were also determined. Results found no significant difference in glucose homeostasis control measure changes. However, plasma intracellular adhesion molecule-1 (ICAM-1) concentration was decreased showing a significant between-treatment changes (=0.037). The concentrations of vascular cell adhesion molecule-1 (VCAM-1) (=0.014) and ICAM-1 (=0.048) were decreased in the treatment group at week 24, and the oxidized low-density lipoprotein (ox-LDL) concentration was reduced at week 24 compared to the baseline value in the treatment group (=0.003). These results indicate a long-term supplementation of ginseng, mulberry leaf, and banaba leaf suppresses inflammatory responses in T2D.
Sensationssuchende Narzissten, Extraversion und Selbstdarstellung in sozialen Netzwerken im Web 2.0
Brailovskaia, J.,Bierhoff, H.-W.
Journal of Business and Media Psychology , 2012,
Abstract: Das Ziel der vorliegenden Arbeit bestand darin, die Beziehung zwischen den Pers nlichkeitsmerkmalen offener und verdeckter Narzissmus, Sensation Seeking sowie Extraversion und der Selbstdarstellung auf einer sozialen Netzwerkseite im Web 2.0 (hier: www.studiVZ.net) zu untersuchen. Es sollte geprüft werden, ob Sensation Seeking einen Einfluss auf den Zusammenhang zwischen dem Narzissmus und der virtuellen Selbstdarstellung nimmt. Zus tzlich wurde untersucht, ob sich die vier Pers nlichkeitsmerkmale in der Art der sozialen Online-Interaktion manifestieren. Die Auspr gung der Pers nlichkeitseigenschaften wurde von 181 Besitzern eines StudiVZ-Profils mithilfe standardisierter Frageb gen erhoben. Anschlie end wurden ihre Profile analysiert. Die Ergebnisse belegten, dass h here Auspr gungen der untersuchten Pers nlichkeitsmerkmale mit einer h heren Selbstdarstellung in Bild und Text sowie virtuellen Interaktion einhergingen.
The heteronuclear E mov effect
Helfrich K.,Hammer H.-W.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100302007
Abstract: Ultracold quantum gases with large scattering length show resonant enhancement of three-body loss rates when an E mov trimer is at the scattering threshold. We calculate the three-body loss rates in heteronuclear mixtures of atoms for the case of large scattering length between the unlike atoms. Using zero-range interactions, we present results from the numerical solution of the integral equations for the recombination amplitude in momentum space and extract expressions for the recombination rate constants. Moreover, we calculate the relative positions of loss features for di erent sign of the scattering length and a rst comparison with available experimental data is shown.
Three-boson bound states in nite volume with EFT
Kreuzer S.,Hammer H.-W.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100304011
Abstract: The universal properties of a three-boson system with large scattering length are well understood within the framework of E ective Field Theory. They include a geometric spectrum of shallow three-body bound states called “E mov states” and log-periodic dependence of scattering observables on the scattering length. We investigate the modi cation of this spectrum in a nite cubic box using a partial wave expansion. The dependence of the binding energies on the box size is calculated for systems with positive and negative two-body scattering length. We compare the full results to results obtained using an expansion around the in nite volume binding energy. The renormalization of the E ective Field Theory in the nite volume is veri ed explicitly.
Causality and universality in low-energy scattering
Lee D.,Hammer H.-W.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100302008
Abstract: We discuss the generalization of Wigner’s causality bounds and Bethe’s integral formula for the e ective range parameter to arbitrary dimension and arbitrary angular momentum. We consider the impact of these constraints on the separation of low- and high-momentum scales and universality in low-energy scattering.
Parametric studies of contrail ice particle formation in jet regime using microphysical parcel modeling
H.-W. Wong ,R. C. Miake-Lye
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2010,
Abstract: Condensation trails (contrails) formed from water vapor emissions behind aircraft engines are the most uncertain components of the aviation impacts on climate change. To gain improved knowledge of contrail and contrail-induced cirrus cloud formation, understanding of contrail ice particle formation immediately after aircraft engines is needed. Despite many efforts spent in modeling the microphysics of ice crystal formation in jet regime (with a plume age <5 s), systematic understanding of parametric effects of variables affecting contrail ice particle formation is still limited. In this work, we apply a microphysical parcel modeling approach to study contrail ice particle formation in near-field aircraft plumes up to 1000 m downstream of an aircraft engine in the soot-rich regime (soot number emission index >1×1015 (kg-fuel) 1) at cruise. The effects of dilution history, ion-mediated nucleation, ambient relative humidity, fuel sulfur contents, and initial soot emissions were investigated. Our simulation results suggest that ice particles are mainly formed by water condensation on emitted soot particles. The growth of ice coated soot particles is driven by water vapor emissions in the first 1000 m and by ambient relative humidity afterwards. The presence of chemi-ions does not significantly contribute to the formation of ice particles in the soot-rich regime, and the effect of fuel sulfur contents is small over the range typical of standard jet fuels. The initial properties of soot emissions play the most critical role, and our calculations suggest that higher number concentration and smaller size of contrail particle nuclei may be able to effectively suppress the formation of contrail ice particles. Further modeling and experimental studies are needed to verify if our findings can provide a possible approach for contrail mitigation.
Circumpolar measurements of speciated mercury, ozone and carbon monoxide in the boundary layer of the Arctic Ocean
J. Sommar, M. E. Andersson,H.-W. Jacobi
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2010,
Abstract: Using the Swedish icebreaker Oden as a platform, continuous measurements of airborne mercury (gaseous elemental mercury (Hg0), divalent gaseous mercury species HgIIX2(g) (acronym RGM) and mercury attached to particles (PHg)) and some long-lived trace gases (carbon monoxide CO and ozone O3) were performed over the North Atlantic and the Arctic Ocean. The measurements were performed for nearly three months (July–September 2005) during the Beringia 2005 expedition (from G teborg, Sweden via the proper Northwest Passage to the Beringia region Alaska – Chukchi Penninsula – Wrangel Island and in-turn via a north-polar transect to Longyearbyen, Spitsbergen). The Beringia 2005 expedition was the first time that these species have been measured during summer over the Arctic Ocean going from 60° to 90° N. During the North Atlantic transect, concentration levels of Hg0, CO and O3 were measured comparable to typical levels for the ambient mid-hemispheric average. However, a rapid increase of Hg0 in air and surface water was observed when entering the ice-covered waters of the Canadian Arctic archipelago. Large parts of the measured waters were supersaturated with respect to Hg0, reflecting a strong disequilibrium. Heading through the sea ice of the Arctic Ocean, a fraction of the strong Hg0 pulse in the water was transferred with some time-delay into the air samples collected ~20 m above sea level. Several episodes of elevated Hg0 in air were encountered along the sea ice route with higher mean concentration (1.81±0.43 ng m 3) compared to the marine boundary layer over ice-free Arctic oceanic waters (1.55±0.21 ng m 3). In addition, the bulk of the variance in the temporal series of Hg0 concentrations was observed during July. The Oden Hg0 observations compare in this aspect very favourably with those at the coastal station Alert. Atmospheric boundary layer O3 mixing ratios decreased when initially sailing northward. In the Arctic, an O3 minimum around 15–20 ppbV was observed during summer (July–August). Alongside the polar transect during the beginning of autumn, a steady trend of increasing O3 mixing ratios was measured returning to initial levels of the expedition (>30 ppbV). Ambient CO was fairly stable (84±12 ppbV) during the expedition. However, from the Beaufort Sea and moving onwards steadily increasing CO mixing ratios were observed (0.3 ppbV day 1). On a comparison with coeval archived CO and O3 data from the Arctic coastal strip monitoring sites Barrow and Alert, the observations from Oden indicate these species to be homogeneously distributed over the Arctic Ocean. Neither correlated low ozone and Hg0 events nor elevated concentrations of RGM and PHg were at any extent sampled, suggesting that atmospheric mercury deposition to the Arctic basin is low during the Polar summer and autumn.
A Combined Feedback and Noise Cancellation Algorithm for Binaural Hearing Aids
LEE, H.-W.,JEON, M.-Y.
Advances in Electrical and Computer Engineering , 2011, DOI: 10.4316/aece.2011.03006
Abstract: This paper proposes an adaptive algorithm for the combined acoustic feedback and noise cancellation in the binaural hearing aids. The proposed algorithm is based on dual microphones for feedback cancellation and the beamforming method for noise cancellation. The coefficients of feedback canceller are updated after subtracting the speech signal from the input signal by dual microphones. And the noise canceller reduces the noise signal in the residual signal excluding the speech by the beamforming method. Firstly, the feedback canceller operates to cancel the feedback signal in the microphone signal, and then the noise canceller operates to reduce the noise in the residual signal. Also, to assure the stable convergence of binaural hearing aids in the training mode, the coefficients of the left hearing aid are firstly updated, then the coefficients of the right hearing aid are updated. In the normal mode, the feedback and the noise canceller are operated without updating coefficients except an unstable case. To verify performances of the proposed algorithm, we analyzed its convergence behavior and simulated for real speech. From the results of simulations, it was proved that we can advance 14.43dB SFR(speech-to-feedback ratio) on average in the feedback canceller, 10.19dB SNR(speech-to-noise ratio) improvement on average in the noise canceller, in the case of applying the proposed algorithm.
Berechnung des Hochfrequenzverhaltens komplexer Strukturen mit der Methode gekoppelter Streuparameter – CSC
H.-W. Glock,K. Rothemund,U. van Rienen
Advances in Radio Science : Kleinheubacher Berichte , 2004,
Abstract: Es wird eine Methode zur Berechnung der Hochfrequenz-Eigenschaften komplexer Strukturen vorgestellt. Das Verfahren beruht auf der Zerlegung der Gesamtstruktur in einzelne einfachere Segmente, deren breitbandige S-Matrizen mit kommerziellen Programmen berechnet werden. Das Gesamtsystem kann von beliebiger Topologie sein, und die Zahl der die Segmente verkoppelnden Hohlleiter- Moden ist nicht begrenzt. Als Ergebnis steht bei offenen Strukturen deren vollst ndige S-Matrix, bei abgeschlossenen deren Resonanzeigenschaften zur Verfügung. Die theoretischen Grundlagen werden beschrieben und die Anwendung mit Beispielen aus dem Gebiet der Teilchenbeschleuniger und zu Eigenschaften schwach elliptisch geformter Resonatoren illustriert. A method called Coupled S-Parameter Calculation – CSC is described which is used to calculate the rf properties of complex structures, i.e. either their scattering (devices with ports) or their resonance properties. The method is based on the segmentation of the entire system into sections being less complex, the external calculation of the section’s broadband S-matrices, and a combination scheme, which is applicable to any topology and number of modes. The method’s principle is described. Examples from the field of particle accelerator cavities and about the properties of weakly elliptical resonators are given.
The Reliability of Shape Measurements
M. Kleinheinrich,T. Erben,K. Meisenheimer,H.-W. Rix
Revista mexicana de astronomía y astrofísica , 2003,
Abstract:
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