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245 papers found.
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A method for defensing against multi-source Sybil attacks in VANET

Sybil attack can counterfeit traffic scenario by sending false messages with multiple identities, which often causes traffic jams and even leads to vehicular accidents in vehicular ad hoc network (VANET). It is very difficult to be defended and detected, especially when it is launched by some conspired attackers using their legitimate identities. In this paper, we propose an event ...

A randomized controlled trial on effects of different hemostatic sponges in posterior spinal fusion surgeries

Background Spinal fusion surgery is associated with significant blood loss, which may result in potential clinical complications, it is necessary to take safe and effective measures to reduce blood loss in surgery. We perform this study to assess the impact of three different hemostatic materials on perioperative blood loss. Methods We performed a Randomized Controlled Trial ...

4DCT and CBCT based PTV margin in Stereotactic Body Radiotherapy(SBRT) of non-small cell lung tumor adhered to chest wall or diaphragm

Background Large tumor motion often leads to larger treatment volumes, especially the lung tumor located in lower lobe and adhered to chest wall or diaphragm. The purpose of this work is to investigate the impacts of planning target volume (PTV) margin on Stereotactic Body Radiotherapy (SBRT) in non-small cell lung cancer (NSCLC). Methods Subjects include 20 patients with the lung ...

Critical nodes identification in complex systems

performance metrics to B Xin Chen identify critical nodes in complex systems such as smart grid, social networks, information systems, and criminal organizations. For example, to protect an electrical power

High Fill Factors of Si Solar Cells Achieved by Using an Inverse Connection Between MOS and PN Junctions

Chen Ming Lu 0 0 Department of Optical Science and Engineering, and Shanghai Ultra-Precision Optical Manufacturing Engineering Center, Fudan University , Shanghai 200433 , China Fill factors (FFs) of

\(\bar{B}_{d,s} \rightarrow D^{*}_{d,s} V\) and \(\bar{B}_{d,s}^* \rightarrow D_{d,s} V\) decays in QCD factorization and possible puzzles

Motivated by the rapid development of heavy-flavor experiments, phenomenological studies of nonleptonic \(\bar{B}_{d,s} \rightarrow D^{*}_{d,s} V\) and \(\bar{B}_{d,s}^* \rightarrow D_{d,s} V\) (\(V=\rho \,,K^*\)) decays are performed within the framework of QCD factorization. Relative to the previous work, the QCD corrections to the transverse amplitudes are evaluated at ...

Positive asymptotically almost periodic solutions for hematopoiesis model

By using the fixed point theory and Lyapunov functional, we establish the existence and stability of asymptotically almost periodic solution to hematopoiesis of the form x ′ ( t ) = − a ( t ) x ( t ) + ∑ i = 1 k b i ( t ) 1 + x n ( t − τ i ( t ) ) , t ∈ R . Unlike many previous related results, we do not assume the condition inf t ∈ R a ( t ) > 0 , which is a key assumption in ...

Nickel pyrithione induces apoptosis in chronic myeloid leukemia cells resistant to imatinib via both Bcr/Abl-dependent and Bcr/Abl-independent mechanisms

Background Acquired imatinib (IM) resistance is frequently characterized by Bcr-Abl mutations that affect IM binding and kinase inhibition in patients with chronic myelogenous leukemia (CML). Bcr-Abl-T315I mutation is the predominant mechanism of the acquired resistance to IM. Therefore, it is urgent to search for additional approaches and targeting strategies to overcome IM ...

Current computational transportation science

such as spatial human-computer interaction, network analysis, routing heuristics, and collaborative transportation and evacuation. Xin Chen is a Senior Engineering Manager and Research Scientist at HERE

A procedure to detect, construct, quantify, numerically simulate and validate fracture networks in coal blocks

Coal mass is a typical sedimentary rock mass with three approximately orthogonal discontinuity sets: bedding planes, face cleats and butt cleats. The mechanical anisotropy of coal masses is dependent on this fabric to a large extent. In this paper, a framework incorporating X-ray computed tomography (CT) scanning, statistical analysis, the fracture tensor based methodology and a ...

Multiple Lines of Evidence from Mitochondrial Genomes Resolve Phylogenetic Relationships of Parasitic Wasps in Braconidae

The rapid increase in the number of mitochondrial genomes in public databases provides opportunities for insect phylogenetic studies; but it also provides challenges because of gene rearrangements and variable substitution rates among both lineages and sites. Typically, phylogenetic studies use mitochondrial sequence data but exclude other features of the mitochondrial genome from ...

Dormant micro arteriovenous malformations lead to recurrent cerebral haemorrhage

Introduction Some micro arteriovenous malformations (AVMs) located in deep brain are undetectable. How to choose a proper timing to detect these AVMs remains unclear. Case description A 21-year-old male patient was admitted to our center for intraventricular haematoma. Digital subtraction angiographies (DSAs) were performed one week and one month respectively after his haemorrhage, ...

A general thermodynamical description of the event horizon in the FRW universe

The Friedmann equation in the Friedmann–Robertson–Walker (FRW) universe with any spatial curvature is derived from the first law of thermodynamics on the event horizon. The key idea is to redefine a Hawking temperature on the event horizon. Furthermore, we obtain the evolution equations of the universe including the quantum correction and explore the evolution of the universe in ...

Effects of Al Doping on the Properties of ZnO Thin Films Deposited by Atomic Layer Deposition

The tuning of structural, optical, and electrical properties of Al-doped ZnO films deposited by atomic layer deposition technique is reported in this work. With the increasing Al doping level, the evolution from (002) to (100) diffraction peaks indicates the change in growth mode of ZnO films. Spectroscopic ellipsometry has been applied to study the thickness, optical constants, ...

Dynamic change of neutrophil to lymphocyte ratio and hemorrhagic transformation after thrombolysis in stroke

Background The neutrophil to lymphocyte ratio (NLR) has been shown to predict short- and long-term outcomes in ischemic stroke patients. We sought to explore the temporal profile of the plasma NLR in stroke patients treated with intravenous thrombolysis (IVT) and its relationship with intracranial bleeding complications after thrombolysis. Methods A total of 189 ischemic stroke ...

A method for defensing against multi-source Sybil attacks in VANET

Sybil attack can counterfeit traffic scenario by sending false messages with multiple identities, which often causes traffic jams and even leads to vehicular accidents in vehicular ad hoc network (VANET). It is very difficult to be defended and detected, especially when it is launched by some conspired attackers using their legitimate identities. In this paper, we propose an event ...

Scheduling on parallel identical machines with late work criterion: Offline and online cases

In the paper, we consider the problem of scheduling jobs on parallel identical machines with the late work criterion and a common due date, both offline and online cases. Since the late work criterion has not been studied in the online mode so far, the analysis of the online problem is preceded by the analysis of the offline problem, whose complexity status has not been formally ...

Ulinastatin administration is associated with a lower incidence of acute kidney injury after cardiac surgery: a propensity score matched study

Background Systemic inflammation is involved in the development of acute kidney injury (AKI) after cardiac surgery with cardiopulmonary bypass (CPB). Ulinastatin, a urinary trypsin inhibitor (UTI), possesses a variety of anti-inflammatory effects. Therefore, we hypothesized that the administration of ulinastatin would reduce the occurrence of AKI in patients undergoing cardiac ...

Long-Term Dynamical Constraints on Pharmacologically Evoked Potentiation Imply Activity Conservation within In Vitro Hippocampal Networks

This paper describes a long-term study of network dynamics from in vitro, cultured hippocampal neurons after a pharmacological induction of synaptic potentiation. We plate a suspension of hippocampal neurons on an array of extracellular electrodes and record electrical activity in the absence of the drugs several days after treatment. While previous studies have reported on ...