1,543 research outputs found
Hybrid automatic-repeat-reQuest systems for cooperative wireless communications
No full textHybrid-Automatic-Repeat-reQuest (H-ARQ) has become an indispensable technique in reliable communication systems. Hence, in this paper we review the state-of-art and investigate the performance of H-ARQ in the context of cooperative wireless communications. As a novel advance, we also propose a relay-switching regime based H-ARQ scheme, which is capable of increasing the achievable system throughput as confirmed by both theory and practice. Furthermore, we evaluate the achievable upper-bound performance in the context of perfect Channel State Information (CSI). Then we proceed to quantify the performance erosion imposed by realistic CSIbased-coherent detection as well as low complexity non-coherent detection assisted cooperative H-ARQ. Finally, we propose a general design guide-lines for H-ARQ aided cooperative systems
Diaspirin cross-linked hemoglobin fails to improve left ventricular diastolic function after fluid resuscitation from hemorrhagic shock
No full textIn severe hemorrhagic shock, left ventricular (LV) diastolic dysfunction is an early sign of cardiac failure due to compromised myocardial oxygenation. Immediate fluid replacement or, in particular, administration of a hemoglobin-based oxygen carrier (diaspirin cross-linked hemoglobin; DCLHb) improves myocardial oxygenation; therefore, positive effects on LV diastolic function could be expected. The effects of fluid resuscitation from severe hemorrhagic shock with DCLHb were investigated in 20 anesthetized domestic pigs. After generation of a critical left anterior descending coronary artery stenosis (narrowing of the artery until disappearance of reactive hyperemia after a 10-second complete vessel occlusion), hemorrhagic shock (mean arterial blood pressure 45 mm Hg) was induced within 15 min by controlled blood withdrawal and maintained for 60 min. Fluid resuscitation consisted of replacement of the plasma volume withdrawn during hemorrhage by infusion of either 10% DCLHb (DCLHb group, n = 10) or 8% human serum albumin (HSA) oncotically matched to DCLHb (HSA group, n = 10). After completion of resuscitation, an observation period of 60 min elapsed. Measurements of central hemodynamics, myocardial oxygenation, and LV Stolic function were performed at baseline, after induction of critical coronary artery stenosis, after 60 min hemorrhagic shock, immediately after resuscitation, and 60 min later. While 5 out of 10 animals treated with died within the first 20 min after fluid resuscitation from acute LV pump failure, all DCLHb-treated animals survived until the end of the protocol (p < 0.05). Despite superior myocardial oxygenation due to augmentation of the arterial O-2 content as well as of coronary perfusion pressure, no beneficial effects on LV diastolic function were observed after infusion of DCLHb. Peak velocity Of LV pressure decrease (dp/dt(min)) did not reveal significant differences between the two groups. Immediately after completion of fluid resuscitation with DCLHb, the time constant of LV diastolic relaxation (tau) was prolonged when compared with HSA-treated animals (p < 0.05), indicating retardation of early LV diastolic relaxation. Our data suggest that DCLHb fails to improve LV diastolic function after fluid resuscitation from severe hemorrhagic shock. However, positive effects on myocardial perfusion. and oxygenation result in a significant reduction of the mortality of severe hemorrhagic shock. Copyright (C) 2001 S.Karger AG, Basel
DD-Pose: A large-scale Driver Head Pose Benchmark
No full textWe introduce DD-Pose, the Daimler TU Delft Driver Head Pose Benchmark, a large-scale and diverse benchmark for image-based head pose estimation and driver analysis. It contains 330k measurements from multiple cameras acquired by an in-car setup during naturalistic drives. Large out-of-plane head rotations and occlusions are induced by complex driving scenarios, such as parking and driver-pedestrian interactions. Precise head pose annotations are obtained by a motion capture sensor and a novel calibration device. A high resolution stereo driver camera is supplemented by a camera capturing the driver cabin. Together with steering wheel and vehicle motion information, DD-Pose paves the way for holistic driver analysis. Our experiments show that the new dataset offers a broad distribution of head poses, comprising an order of magnitude more samples of rare poses than a comparable dataset. By an analysis of a state-of-the-art head pose estimation method, we demonstrate the challenges offered by the benchmark. The dataset and evaluation code are made freely available to academic and non-profit institutions for non-commercial benchmarking purposes
Developmental Disorders (DD) and Fibromyalgia (FM), we might be able to develop both treatments at once!?
No full textThis was written when the author was 2nd year undergraduate student in Kyushu University. In this paper, I explain following 3 topics: ①Development Disorders (DD), are one of physical disabilities ②study of pain (brain, neuron, and fibromyalgia (FM)) ③ DD and FM, we might be able to develop both treatments at once!
Developmental Disorders (DD) and Fibromyalgia (FM), we might be able to develop both treatments at once!?
No full textThis was written when the author was 2nd year undergraduate student in Kyushu University. In this paper, I explain following 3 topics: ①Development Disorders (DD), are one of physical disabilities ②study of pain (brain, neuron, and fibromyalgia (FM)) ③ DD and FM, we might be able to develop both treatments at once!
Developmental Disorders (DD) and Fibromyalgia (FM), we might be able to develop both treatments at once!?
No full textThis was written when the author was 2nd year undergraduate student in Kyushu University. In this paper, I explain following 3 topics: ①Development Disorders (DD), are one of physical disabilities ②study of pain (brain, neuron, and fibromyalgia (FM)) ③ DD and FM, we might be able to develop both treatments at once!
Evidence for B-0 -> D+D- and observation of B-->(DD-)-D-0 and B-->(DD*-)-D-0 decays
No full textWe report evidence for B-0 -> D+D- and the first observation of the decay modes B-->(DD-)-D-0 and B-->(DD*-)-D-0 based on a sample of 152x10(6) B (B) over bar events collected by the Belle detector at KEKB. The branching fractions for B-0 -> D+D-, B-->(DD-)-D-0, and B-->(DD*-)-D-0 are found to be (1.91 +/- 0.51 +/- 0.30)x10(-4), (4.83 +/- 0.78 +/- 0.58)x10(-4), and (4.57 +/- 0.71 +/- 0.56)x10(-4), respectively. Charge asymmetries in the B-->(DD-)-D-0 and B-->(DD*-)-D-0 channels are consistent with zero
The Influence of Intellectual/Developmental Disabilities (I/DD) Curriculum Content on Career Interests for Social Work Students
No full textThis study examines how curriculum content on Intellectual/Developmental Disabilities (I/DD) impacts the career interests of social work students. With the growing demand for social workers proficient in I/DD services, it is crucial to understand how educational experiences shape career choices. Using a QUANT→Qual mixed-method approach, this quasi-experimental pre/post-test survey combined quantitative data (N 66 [experimental group]; N =103 [control group] and open-ended survey questions (N = 66 [experimental group]; N =103 [control group] from social work students.
The author-constructed survey assessed student attitudes, perceptions, preparedness, ability to identify I/DD, knowledge of I/DD, and willingness to practice with individuals with I/DD before and after exposure to I/DD-focused curriculum content over a 15-week period. The quantitative findings indicated that exposure to I/DD-focused curriculum content significantly improved students’ preparedness, ability to identify I/DD, knowledge about I/DD, and willingness to work with this population. Qualitative findings indicated that students who completed the I/DD courses reported increased confidence and interest in pursuing careers involving I/DD roles. The study findings emphasize the importance of including dedicated I/DD content in social work education to better equip future practitioners
Comparison of magnetic couplers for IPT-based EV charging using multi-objective optimization
No full textInductive power transfer (IPT) is becoming increasingly popular in stationary electric vehicle (EV) charging systems. In this paper, the influence of the different IPT coupler geometries on the performance factors such as efficiency, power density, misalignment tolerance, and stray field is studied. Four different coupler topologies, namely the circular, rectangular, double-D (DD-DD), and the double-D transmitter with double-D-quadrature receiver (DD-DDQ) are considered in this study. The electromagnetic behavior of the couplers is modeled using three-dimensional finite-element method, which is validated by experiments on a laboratory prototype. A multi-objective optimization (MOO) framework is developed to analyze the Pareto tradeoffs between conflicting performance metrics for the couplers. Optimization results depict that the circular topology performs best among the selected topologies regarding higher coupling coefficient, and efficiency for similar active mass and coupler area. Circular and rectangular couplers perform better than the polarized couplers like DD-DD and DD-DDQ regarding stray field exposure in both vertical and lateral direction of the coupler position in the EV. However, polarized couplers show more tolerance toward misalignment compared to circular and rectangular couplers. Thus, this study provides information regarding the specific strengths and weaknesses of different coupler topologies, which can be used during the initial design phase.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.DC systems, Energy conversion & Storag
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