A revised Incremental Conductance (IncCond) maximum power point tracking (MPPT) algorithm for PV generation systems is proposed in this paper. The commonly adopted traditional IncCond method uses a constant step size for voltage adjustment and is difficult to achieve both a good tracking performance and quick elimination of the oscillations, especially under the dramatic changes of the environm...

Historically, most radar sensor array processing has been implemented using dedicated and specialized processing systems. This approach was necessary because the algorithm computation requirements were several orders of magnitude higher than any commercial supercomputer could provide in an acceptable size, weight and power. Most recently, with the interest by the military to employ commercial-o...

In s-to-p broadcasting, s processors in a p-processor machine contain a message to be broadcast to all the processors, 1 ≤ s ≤ p. We present a number of different broadcasting algorithms that handle all ranges of s. We show how the performance of each algorithm is influenced by the distribution of the s source processors and by the relationships between the distribution and the characteristics ...

In this work we describe our results on identifying the most important overheads in the network subsystem of massively parallel processors (MPPs), specially the Intel Paragon. We show how poor implementation techniques currently prevent performance of applications using TCP/IP protocols to communicate between supercomputers connected by high performance networks from achieving data rates close ...

Last year’s paper by Bell and Gray [1] examined past trends in high performance computing and asserted likely future directions based on market forces. While many of the insights drawn from this perspective have merit and suggest elements governing likely future directions for HPC, there are a number of points put forth that we feel require further discussion and, in certain cases, suggest alte...

Adhesion properties of hematopoietic stem cells (HSCs) in the bone marrow (BM) niches control their migration and affect their cell-cycle dynamics. The serum response factor (Srf) regulates growth factor-inducible genes and genes controlling cytoskeleton structures involved in cell spreading, adhesion, and migration. We identified a role for Srf in HSC adhesion and steady-state hematopoiesis. C...

We extended and tested the MITRE real-time embedded scalable high performance computing benchmarking concept by implementing the RT_2DFFT benchmark on the MasPar MP-X series of massively parallel processors (MPPs). The RT_2DFFT benchmark specifies a symmetric two-dimensional fast Fourier transform (FFT) within a real-time software test bench. The test bench provides the realistic stimulus for t...

HSCs either self-renew or differentiate to give rise to multipotent cells whose progeny provide blood cell precursors. However, surprisingly little is known about the factors that regulate this choice of self-renewal versus differentiation. One candidate is the Notch signaling pathway, with ex vivo studies suggesting that Notch regulates HSC differentiation, although a functional role for Notch...

DCs develop from multipotent progenitors (MPPs), which commit into DC-restricted common dendritic cell progenitors (CDPs). CDPs further differentiate into classical DCs (cDCs) and plasmacytoid DCs (pDCs). Here, we studied the impact of histone acetylation on DC development in C57BL/6 mice by interfering with histone acetylation and deacetylation, employing histone deacetylase (HDAC) inhibitors....

Massively parallel processors (MPPs) hold the promise of extremely high performance that, if realized, could be used to study problems of unprecedented size and complexity. One of the primary stumbling blocks to this promise has been the lack of tools to translate application codes to MPP form. In this paper we show how applications codes written in a subset of Fortran 77 called Fortran-P can b...