-The real time properties of traditional Ethernet are poor. The end-to-end latency through an Ethernet network based on thin Ethernet (coax 10BASE-2) or hubs (10BASE or 100BASE) depends on the network load. The non deterministic property of the Carrier Sense Multiple Access – Collision Detection (CSMA/CD) scheme has been the main argument against Ethernet as the communication solution for appli...

In this paper, we study predictability of exchange rates and explore determinants of its dynamics over time. We model the admissible amount of predictability in two ways, each corresponding in a stylized manner to a broad class of rational currency pricing models, namely those under which the marginal currency trader can diversify away currency risk and alternative specifications under which th...

In this manuscript, the author has tried to analyze a study of Variable Frequency Drives. Variable frequency drives are energy saving drives. But they generate harmonics generates. Harmonics introduced by any means affect the performance parameters of any system The presence of harmonics is the system for a long duration & that, too, of higher order affect the various parameters in a Power dist...

Solid-state drives (SSDs) are quickly becoming an affordable alternative to mechanical hard disk drives. SSDs perform low latency reads and have access times that are magnitudes smaller than those of their mechanical counterparts. Many current file systems make clever optimizations that target mechanical hard disk drives; the faster performance of SSDs without use of mechanical parts makes obso...

The paper focuses on some aspects of control and estimation in electric drives with inverter output filters. The filters are used in some industrial drives with pulse width modulated (PWM) inverters. They smoothes the motor supply voltage and current so nearly sinusoidal shapes are obtained. The filters can also limit the bearing current and shaft voltages. Because of the voltage drop and phase...

 Traditional 2-level high-frequency pulse width modulation (PWM) inverters for motor drives have several problems associated with their high frequency switching which produces common-mode voltage and high voltage change (dV/dt) rates to the motor windings. Multilevel inverters solve these problems because their devices can switch at a much lower frequency. Two different multilevel topologies a...

In this paper we address issues of reliability of RAID systems. We focus on “big data” systems with a large number of drives and advanced error correction schemes beyond RAID 6. Our RAID paradigm is based on Reed-Solomon codes, and thus we assume that the RAID consists of N data drives and M check drives. The RAID fails only if the combined number of failed drives and sector errors exceeds M, a...

Cooperative breeding, in which more than a pair of conspecifics cooperate to raise young at a single nest or brood, is widespread among vertebrates but highly variable in its geographic distribution. Particularly vexing has been identifying the ecological correlates of this phenomenon, which has been suggested to be favored in populations inhabiting both relatively stable, productive environmen...

The considered converter-fed permanent magnet motor could alternatively be operated in two basically different states − the vector control mode or alternatively the brushless dc, also known as electronically commutated mode. Several quality aspects concerning the system performance have been comparatively investigated in practical as well as theoretical manner. Focus is thereby given to the num...

One might imagine that AI systems with harmless goals will be harmless. This paper instead shows that intelligent systems will need to be carefully designed to prevent them from behaving in harmful ways. We identify a number of “drives” that will appear in sufficiently advanced AI systems of any design. We call them drives because they are tendencies which will be present unless explicitly coun...