Modeling the reliability of distributed systems requires a good understanding of the reliability of the components. Careful modeling allows highly fault-tolerant distributed data applications to be constructed at the least cost. Failure and repair rates of components are o f e n assumed to be exponentially distributed. This hypothesis is testable f o r failure rates, though the process of gathe...

Improved performance and reliability of 9xx nm single emitter laser diodes are presented. To date, over 15,000 hours of accelerated multi-cell lifetest reliability data has been collected, with drive currents from 14A to 18A and junction temperatures ranging from 60C to 110C. Out of 208 devices, 14 failures have been observed so far. Using established accelerated lifetest analysis techniques,...

In industrial globalization “safety” is emerging as most noticing and valued factor. The main intention of this design of safety systems is to avoid unexpected accidents and to achieve reduction in dangerous environment according to health and property risk. The different safety functions considered to increase the relative safety of the plant are combinable and all together named as safety ins...

New techniques have recently appeared that can extend the advantages of grapple yarding to fast-growing plantations. The most promising technique consists of an excavator-base un-guyed yarder equipped with new radio-controlled grapple carriages, fed by another excavator stationed on the cut-over. This system is very productive, avoids in-stand traffic, and removes operators from positions of hi...

The IDBB converter features just one controlled switch and two inductors and is able to supply a solid-state lamp from the mains providing high power factor and good efficiency. And with a careful design of the converter the filter capacitances can be made small enough so that film capacitors may be used. Thus the converter mean time between failures can be made as high as that of the solid-sta...

Starting with the meaning of the word quality, diverse concepts connoted by the term are examined. Instead of a bathtub curve, the desirable shape of a failure rate covering the entire life of a good product, which might be called hockey-stick line, is introduced. From the hockey-stick line and the definition of reliability, two measurements are extracted. The terms r-reliability (failure rate)...

[1] In recent years, the Indian Ocean (IO) has been discovered to have a much larger impact on climate variability than previously thought. This paper reviews climate phenomena and processes in which the IO is, or appears to be, actively involved. We begin with an update of the IO mean circulation and monsoon system. It is followed by reviews of ocean/atmosphere phenomenon at intraseasonal, int...

P redictability is a measure of how accurately we can forecast a future event. 100% predictability is synonymous with omnipotence, 0% with having no clue whatsoever. Analog devices generally provide good levels of predictability. For example, manufacturers sell light bulbs with MTTF (mean time to failure) scores. A car traveling at 40 mph will still be traveling at a speed plus or minus some sm...

With our current expectation for the exascale systems, composed of hundred of thousands of many-core nodes, the mean time between failures will become small, even under the most optimistic assumptions. One of the most scalable checkpoint restart techniques, the message logging approach, is the most challenged when the number of cores per node increases because of the high overhead of saving the...

Lamotrigine is licensed for first-line monotherapy use in the United Kingdom but many physicians have been reluctant to use it because of its perceived increased cost over conventional first-line antiepileptic medication. Clinical trials, however, have suggested that it has equivalent efficacy to conventional drugs in this role, with a significantly reduced side effect profile. It has been the ...