Applicative redundancy

After SAET-METEOR, another approach was investigated in order to achieve a solution with fully integrated redundancy, based on the same hardware architecture, but this time completely seamless from an application viewpoint. This approach comes from work nndertaken on PADRE, a redimdancy management protocol where consistency is guaranteed by a process on the execution contexts of the applications [ESS 99]. 

All inputs are supplied to SEC RED, which is then free to modify the input according to values received by the other unit and according to its own internal state (especially in the redundancy mode). 

Each application then computes its own output (as it would be without redundancy) and begins to update its own state, the only difference being that these calculations are done only if the redundancy allows in other words, the redundancy can freeze all cyclical application processing. Finally, the outputs are provided by the application to SEC RED, which decides, still according to its own state and the outputs of the redundant unit, if they can be applied as they are, or if they should be forced to a restrictive state. 

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Since the t distribution relies on the sample standard deviation. s, the resultant distribution will differ according to the sample size n. To designate this difference, the respec tive distributions are classified according to what are called the degrees of freedom and abbreviated as df. In simple problems, the df are just the sample size minus I. In more complicated applications the df can be different. In general, degrees of freedom are the number of quantities minus the number of constraints. For example, four numbers in a square which must have row and column sums equal to zero have only one df, i.e., four numbers minus three constraints (the fourth constraint is redundant). 

Gas compressors operating on highly toxic or flammable gases may require redundant systems to assure no leakages. In many applications, such as refrigeration gas, buffer seals are required with the liquid-buffered face seal. A popular technique is to use a buffered labyrinth seal with a liquid seal. 

In addition to tlie applications cited above, tlie Poisson distribution can be used to obtain tlie reliability of a standby redundancy system, in which one unit is in tlie operating mode and n identical units are in standby mode. Unlike a... 

One approach is to extend the columns of a measurement table by means of their powers and cross-products. An example of such non-linear PCA is discussed in Section 37.2.1 in an application of QSAR, where biological activity was known to be related to the hydrophobic constant by means of a quadratic function. In this case it made sense to add the square of a particular column to the original measurement table. This procedure, however, tends to increase the redundancy in the data. 

Triple Modular Redundant (TMR) - A system that employs a 2 out of 3 (2003), voting scheme to determine the appropriate output action. It is based on the application of three separate operating systems running in parallel. 

In this chapter, the mathematical tools and fundamental concepts utilized in the development and application of modem estimation theory are considered. This includes the mathematical formulation of the problem and the important concepts of redundancy and estimability in particular, their usefulness in the decomposition of the general optimal estimation problem. A brief discussion of the structural aspects of these concepts is included. 

On the other hand they do have a high aspect ratio, and are quite suitable for field emission applications. Their structure means that the field emitting sites have more redundancy than simple CNTs, so the emitting site could pass along a wall, giving a higher stability. 

A traditional approach to fault diagnosis in the wider application context is based on hardware i.e. physical) redundancy methods which use multiple lines of sensors, actuators, computers and software to measure and/or control a particular variable. Typically, a voting scheme is applied to the hardware redundant system to decide if and when a fault has occurred and its likely location amongst redundant system components. The use of multiple redundancy in this way is common, for example with digital fly-by-wire flight control... 

Many of the bioinformatics programs contain redundant information, so we try to differentiate them based on their applications. Only some of those most commonly used tools are discussed because of space limitation. Web sites mentioned in this chapter were accessed in October 2007. The most recent advances in the field can be updated through browsing these sites regularly as new databases and tools are often added. To facilitate up-to-date bioinformatics support, an integrated search engine and updated collections of tools are freely available at http //sysmed.pharmtao.com. 

The graphical construction of an extraction isotherm, an operating line, and the stepwise evaluation of the number of stages in this manner is known as a McCabe-Thiele diagram. Flistorically, it found great application in a variety of mass transfer operations, from gas adsorption through distillation to solvent extraction. Flowever, the advent of modern computational techniques has made it largely redundant, as it is often easier and certainly more accurate to calculate the cascade directly. 

The functional groups almost exclusively involved in NIRS are those involving the hydrogen atom C-H, N-H, O-H (see Figure 5.1). These groups are the overtones and combinations of their fundamental frequencies in the mid-infrared and produce absorption bands of useful intensity in the NIR. Because the absorptivi-ties of vibrational overtone and combination bands are so much weaker, in NIRS the spectra of condensed phase, physically thick samples, can be measured without sample dilution or the need to resort to difficult short-path length sampling techniques. Thus conventional sample preparation is redundant, and fortunately so, because most PAT applications require direct measurement of the sample " either in situ, or after extraction of the sample from the process in a fast loop or bypass. 

Performance trials and evaluation tests on the technique indicate that it is both rehable and accurate, and, in addition, that the specificity is sufficient to cope with most chnical requirements. An evaluation was made by Haeckel et al. [19]. If this approach is successful, the dispensers and tubes in laboratories will become redundant. It may well become possible for a clinical test to be undertaken close to the patient rather than in the laboratory. Whilst the techniques have as yet been used only for clinical analyses, there are many other potential applications, for example in the water industry. However, the very nature of the technique necessitates development by Eastman Kodak. Very few users will be able to influence the choice of analytical problems to be tackled by this unique approach. 

The development of a plethora of HPLC CSPs in the 1980s and 1990s has, to a large extent, made the use of chiral mobile-phase additives (CMPAs) redundant in most modem pharmaceutical analytical laboratories [23]. Before this period, chiral selectors were used routinely as additives in HPLC, but are now only used for a small number of specific applications [23]. CMPAs are used to form... 

It should be noted that unnecessary application of the one-branch approach may lead to needless algebraic manipulations. Furthermore, the branching technique often results in redundant terms that must be searched out and deleted. As an example, let us write the determinant for E in Scheme 4 by the one-branch method ... 

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