In modern enterprise storage systems, there is a trend that using NAND flash based solid state disks (SSDs) as a second-level disk cache to reduce the slow access to hard disk drives (HDDs) by caching the hot data of HDDs with SSDs. However, using SSDs for both caching and prefetching has rarely been discussed due to the performance penalty caused by unsuccessful prefetching, including garbage ...

Since the invention of NAND Flash memory in the 1980’s, non-volatile memory (NVM) has touched all aspects of our daily life. Applications for NVM is growing everyday from handy data storage devices like a USB Flash Drive to High Definition Multimedia Interface (HDMI) and its high-bandwidth digital content protection (HDCP) encryption algorithms to firmware storage in a variety of digital device...

Flash memory has been gaining more popularity as a substitution for magnetic disk. However, due to asymmetric IO latency, cache management policy needs to be reconsidered in systems equipped with flash. A novel buffer replacement approach named ACAR, which stands for Adaptive Cost Aware cache Replacement, is proposed in this paper to address this problem. Taking operation cost into consideratio...

We review the observed properties of extremely hot hydrogen-deficient post-AGB stars of spectral type [WC] and PG1159. Their H-deficiency is probably caused by a (very) late heliumshell flash or a AGB final thermal pulse, laying bare interior stellar regions which are usually kept hidden below the hydrogen envelope. Thus, the photospheric element abundances of these stars allow to draw conclusi...

Network early warning system (NEWS) is an adaptive flashcrowd protection system. Unlike approaches using manually configured request rate limit, NEWS regulates incoming requests by observing response performance, automatically adapting to changing traffic mixes. We have previously studied NEWS performance through simulation; this paper presents an implementation of NEWS on a Linux-based router....

We present 1D numerical simulations aimed at studying the hot-flasher scenario for the formation of He-rich subdwarf stars. Sequences were calculated for a wide range of metallicities and with the He core flash at different points of the post-RGB evolution (i.e. different remnant masses). We followed the complete evolution from the ZAMS, through the hot-flasher event, and to the subdwarf stage ...

OBJECTIVE To determine whether hot flashes, depressed mood, sleep, cognitive and sexual symptoms correlate with urinary follicle-stimulating hormone (FSH), estrone (E(1)G), and testosterone (T) and with each other during the menopausal transition and early postmenopause (PM). METHODS Forty-one women who transitioned from middle or late transition stage to PM rated symptoms and provided monthl...

Hot flashes can be a major problem for patients with a history of breast cancer. The precipitation of menopause in premenopausal women who undergo chemotherapy for breast cancer can lead to the rapid onset of hot flash symptoms that are more frequent and more severe than those associated with natural menopause. In addition, tamoxifen, historically the most commonly prescribed pharmacologic agen...

Apical dendrites of layer V cortical pyramidal neurons are a major target for glutamatergic synaptic inputs from cortical and subcortical brain regions. Because innervation from these regions is somewhat laminar along the dendrites, knowing the distribution of glutamate receptors on the apical dendrites is of prime importance for understanding the function of neural circuits in the neocortex. T...

The evolution of central stars of planetary nebulae can proceed in several distinct ways, either leading to H-deficiency or to H-normal surface composition. Several new simulations of the evolution channels that lead to H-deficiency are now available, mainly the born-again scenarios that are triggered by a He-shell flash during the hot pre-white dwarf evolution phase. A realistic AGB progenitor...