956 research outputs found
Human platelet activation by Escherichia coli: roles for FcγRIIA and integrin αIIbβ3
Gram-negative Escherichia coli cause diseases such as sepsis and hemolytic uremic syndrome in which thrombotic disorders can be found. Direct platelet–bacterium interactions might contribute to some of these conditions; however, mechanisms of human platelet activation by E. coli leading to thrombus formation are poorly understood. While the IgG receptor FcγRIIA has a key role in platelet response to various Gram-positive species, its role in activation to Gram-negative bacteria is poorly defined. This study aimed to investigate the molecular mechanisms of human platelet activation by E. coli, including the potential role of FcγRIIA. Using light-transmission aggregometry, measurements of ATP release and tyrosine-phosphorylation, we investigated the ability of two E. coli clinical isolates to activate platelets in plasma, in the presence or absence of specific receptors and signaling inhibitors. Aggregation assays with washed platelets supplemented with IgGs were performed to evaluate the requirement of this plasma component in activation. We found a critical role for the immune receptor FcγRIIA, αIIbβ3, and Src and Syk tyrosine kinases in platelet activation in response to E. coli. IgG and αIIbβ3 engagement was required for FcγRIIA activation. Moreover, feedback mediators adenosine 5’-diphosphate (ADP) and thromboxane A₂ (TxA₂) were essential for platelet aggregation. These findings suggest that human platelet responses to E. coli isolates are similar to those induced by Gram-positive organisms. Our observations support the existence of a central FcγRIIA-mediated pathway by which human platelets respond to both Gram-negative and Gram-positive bacteria
Implementasi Amazon ECHO DOT Berbasis RASPBERRY Pi Pada Ruang Kelas
Amazon echo-smart speaker merupakan salah satu devais Internet of Things (IoT) yang dikembangkan oleh amazon yang sangat potensial penggunaannya karena ada di mana-mana dan mode operasi yang selalu aktif. Amazon Echo secara khusus memainkan peran penting dalam intelligent virtual assistant (IVA) Alexa berbasis cloud yang dikembangkan oleh Amazon Lab126. Smart speaker nirkabel yang diaktifkan Alexa adalah pintu gerbang untuk semua perintah suara yang dikirimkan ke Alexa. Sedangkan Raspberry Pi adalah credit card size computer yang dapat digunakan untuk menjalankan program perkantoran, permainan komputer, dan sebagai pemutar media hingga video beresolusi tinggi. Pada penelitian ini akan membahas implementasi amazon echo dot berbasis raspberry pi pada ruang kelas
Implementasi Amazon ECHO DOT Berbasis RASPBERRY Pi Pada Ruang Kelas
Amazon echo-smart speaker merupakan salah satu devais Internet of Things (IoT) yang dikembangkan oleh amazon yang sangat potensial penggunaannya karena ada di mana-mana dan mode operasi yang selalu aktif. Amazon Echo secara khusus memainkan peran penting dalam intelligent virtual assistant (IVA) Alexa berbasis cloud yang dikembangkan oleh Amazon Lab126. Smart speaker nirkabel yang diaktifkan Alexa adalah pintu gerbang untuk semua perintah suara yang dikirimkan ke Alexa. Sedangkan Raspberry Pi adalah credit card size computer yang dapat digunakan untuk menjalankan program perkantoran, permainan komputer, dan sebagai pemutar media hingga video beresolusi tinggi. Pada penelitian ini akan membahas implementasi amazon echo dot berbasis raspberry pi pada ruang kelas
Truncated Turbo Equalizer with SIC for OTFS
Orthogonal time frequency space (OTFS) is a promising candidate waveform for
the next generation wireless communication systems. OTFS places data in the
delay-Doppler (DD) domain, which simplifies channel estimation in highmobility
scenarios. However, due to the 2-D convolution effect of the time-varying
channel in the DD domain, equalization is still a challenge for OTFS. Existing
equalizers for OTFS are either highly complex or they do not consider
intercarrier interference present in high-mobility scenarios. Hence, in this
paper, we propose a novel two-stage detection technique for coded OTFS systems.
Our proposed detector brings orders of magnitude computational complexity
reduction compared to existing methods. At the first stage, it truncates the
channel by considering only the significant coefficients along the Doppler
dimension and performs turbo equalization. To reduce the computational load of
the turbo equalizer, our proposed method deploys the modified LSQR (mLSQR)
algorithm. At the second stage, with only two successive interference
cancellation (SIC) iterations, our proposed detector removes the residual
interference caused by channel truncation. To evaluate the performance of our
proposed truncated turbo equalizer with SIC (TTE-SIC), we set the minimum mean
squared error (MMSE) equalizer without channel truncation as a benchmark. Our
simulation results show that the proposed TTE-SIC technique achieves about the
same bit error rate (BER) performance as the benchmark
An integral control formulation of Mean-field game based large scale coordination of loads in smart grids
Pressure on ancillary reserves, i.e.frequency preserving, in power systems
has significantly mounted due to the recent generalized increase of the
fraction of (highly fluctuating) wind and solar energy sources in grid
generation mixes. The energy storage associated with millions of individual
customer electric thermal (heating-cooling) loads is considered as a tool for
smoothing power demand/generation imbalances. The piecewise constant level
tracking problem of their collective energy content is formulated as a linear
quadratic mean field game problem with integral control in the cost
coefficients. The introduction of integral control brings with it a robustness
potential to mismodeling, but also the potential of cost coefficient
unboundedness. A suitable Banach space is introduced to establish the existence
of Nash equilibria for the corresponding infinite population game, and
algorithms are proposed for reliably computing a class of desirable near Nash
equilibria. Numerical simulations illustrate the flexibility and robustness of
the approach
Application Development Risk Assessment Model Based on Bayesian Network
This paper describes a new risk assessment model for application development and its implementation. The model is developed using a Bayesian network and Boehm’s software risk principles. The Bayesian network is created after mapping top twenty risks in software projects with interrelationship digraph of risk area category. The probability of risk on the network is analyzed and validated using both numerical simulation and subjective probability from several experts in the field and a team of application developers. After obtaining the Bayesian network model, risk exposure is calculated using Boehm's risk principles. Finally, the implementation of the proposed model in a government institution is shown as a real case illustration
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Rod photoreceptors drive circadian photoentrainment across a wide range of light intensities.
In mammals, synchronization of the circadian pacemaker in the hypothalamus is achieved through direct input from the eyes conveyed by intrinsically photosensitive retinal ganglion cells (ipRGCs). Circadian photoentrainment can be maintained by rod and cone photoreceptors, but their functional contributions and their retinal circuits that impinge on ipRGCs are not well understood. Using mice that lack functional rods or in which rods are the only functional photoreceptors, we found that rods were solely responsible for photoentrainment at scotopic light intensities. Rods were also capable of driving circadian photoentrainment at photopic intensities at which they were incapable of supporting a visually guided behavior. Using mice in which cone photoreceptors were ablated, we found that rods signal through cones at high light intensities, but not at low light intensities. Thus, rods use two distinct retinal circuits to drive ipRGC function to support circadian photoentrainment across a wide range of light intensities
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