Erasure coding is widely used for massive storage in data centers to achieve high fault tolerance and low storage redundancy. Since the cross-rack communication cost is often high, it is critical to design erasure codes that minimize the cross-rack repair bandwidth during failure repair. In this paper, we analyze the optimal trade-off between storage redundancy and cross-rack repair bandwidth s...

ASTRONOMY AND ASTROPHYSICS HV Ursae Majoris, a new contact binary with early-type components ⋆ Abstract. We present the first U BV and uvby photomet-ric observations for the short period variable star HV Ur-sae Majoris classified as a field RRc variable. The observed differences between the consecutive minima and the lack of colour variations disagree with the RRc-classification and suggest the...

In the Universal Mobile Telecommunications System (UMTS) the radio resource management functions are jointly handled in two different protocol layers, the Radio Resource Control (RRC) and the Medium Access Control (MAC). Congestion control functions are performed in the RRC layer. Therefore congestion control requires strong interactions between the radio interface protocol layers, including me...

Two challenging issues for future wireless communication systems are the support of Quality of Service (QoS) and the definition of flexible access schemes to be used in heterogeneous systems (public cellular systems, wireless local area and ad-hoc networks). This paper deals with the class of Radio Resource Control (RRC) based on power regulation, where typical PHY layers parameters (powers, in...

We have revisited the problem of metallicity prediction RR Lyrae stars from their near-infrared light curves in Cousins I waveband. Our study is based on high-quality time-series photometry and state-of-the-art high-resolution spectroscopic abundance measurements 80 fundamental-mode (RRab) 24 first-overtone (RRc) stars, spanning $\sim$[$-2.7$,$+0.18$] dex $\sim$[$-3$,$-0.5$] ranges, respectivel...

Considerable research has taken place in recent times in the area of parameterization of software defined radio (SDR) architecture. Parameterization decreases the size of the software to be downloaded and also limits the hardware reconfiguration time. The present paper is based on the design and development of a programmable baseband modulator that perform the QPSK modulation schemes and as wel...

We present new BV CCD photometry, light curves, and ephemerides for 9 previously known, 29 newly detected RR Lyrae variables and one newly detected variable of an unknown type in the globular cluster M75. The photometry used for the detection of the additional variables was obtained with the image subtraction package ISIS. The data were acquired on an observing run in July 1999 and range over 7...

Aging is tightly associated with redox events. The free radical theory of aging indicates that redox imbalance may be an important factor in the aging process. Most studies about redox and aging focused on the static status of oxidative stress levels, there has been little research investigating differential responses to redox challenge during aging. In this study, we used Caenorhabditis elegan...

Ida C. Merriam (1985), former assistant commissioner of the Social Security Administration’s (SSA’s) Office of Research and Statistics, wrote those words in a Social Security Bulletin article commemorating the agency’s research efforts at its 50th anniversary. Since its inception nearly 75 years ago, SSA has worked to produce high quality, research-based information required to formulate policy...