Object pooling

Now CheshireManager becomes the Fa ade of Cheshire Runtime. As described earlier in this chapter, the Cheshire environment is not thread-safe therefore, managing the CheshireManager object becomes a challenge. There are two options one is to create only one instance of the CheshireManager within the JVM and let all requests share it. The other is to create a pool of CheshireManager that implements the RMI Remote interface—each runs in its own JVM. We have discussed the pros and cons of each approach. Here we take the first approach. However, we still implement it using an object pool for readers who are interested in the second approach. We use Apache Org s Object Pool Library to illustrate how it works. 

Apache s Object Pool Library requires an object factory for each pooled object. The factory only needs to implement one method—makeObject(). The library provides default implementations to all other methods. In our example, die CheshireManager is the pooled object, so we need a PoolableCheshire-ManagerFactory ... 

The literature provides little information on the effects of thermal radiation from flash fires, probably because thermal radiation hazards from burning vapor clouds are considered less significant than possible blast effects. Furthermore, flash combustion of a vapor cloud normally lasts no more than a few tens of seconds. Therefore, the total intercepted radiation by an object near a flash fire is substantially lower than in case of a pool fire. 

Classification by objective Exploration Exploration OOOO well Appraisal well OO Delineation well Q New-structure test Q New-pool test Q Deeper-pool test Q Shallower-pool test Q New-licence block QQ appraisal test Fault block O extension test Appraisal/outpost 0 test (delineation) Stratigraphic test O0 New-field wildcat 0 New-pool wildcat 0 Deeper-pool test 0 Shallower-pool test 0 Outpost or 00 extension test Key well 00 - Group one - Group two Parametric well O0 Core well 00 Prospecting well 00 Exploratory well 00 Exploration O000 well Appraisal well 0O... 

Energy can be transferred from one object to another. Anyone who has played a game of pool has firsthand experience with energy transfers. When the cue ball strikes the pack, the balls carom off in all directions. The cue ball loses most of its speed, and it may even come to a complete stop. The collision transfers kinetic energy from the cue ball to the other balls. Whereas transfers of energy among pool balls occur when initiated by a pool cue. 

The LLM approach described above has been applied to the 35x4 contingency Table 32.10 after some modification. In this case, we have replaced the pooled data in the first five rows by the corresponding average annual values. Further, columns 1 and 2 have been combined with columns 3 and 4 in order to produce the categories of women in all fields and of men in all fields. The reason for the change is our objective to produce an analysis of the ratios between chemistry and all fields rather than between chemistry and the other fields. 

As stated earlier, LDA requires that the variance-covariance matrices of the classes being considered can be pooled. This is only so when these matrices can be considered to be equal, in the same way that variances can only be pooled, when they are considered equal (see Section 2.1.4.4). Equal variance-covariance means that the 95% confidence ellipsoids have an equal volume (variance) and orientation in space (covariance). Figure 33.10 illustrates situations of unequal variance or covariance. Clearly, Fig. 33.1 displays unequal variance-covariance, so that one must expect that QDA gives better classification, as is indeed the case (Fig. 33.2). When the number of objects is smaller than the number of variables m, the variance-covariance matrix is singular. Clearly, this problem is more severe for QDA (which requires m < n ) than for LDA, where the variance-covariance matrix is pooled and therefore the number of objects N is the sum of all objects... 

The main objective of the survey was to ascertain attitudes and perception of pool operators towards pool water treatment. To this end, the survey included two key questions ... 

Care must be taken to ensure that the criteria or methods used closely match the site-specific conditions under study. Failure to do so may result in early elimination of at-risk buildings from the analysis pool. Further, when standard criteria are being applied, care must be taken to ensure that the objective of the standard matches the intent of the study. A standard developed for equipment protection or loss prevention may not be appropriate for personnel protection. 

Most polymers used in oil field operations and resource recovery are synthetic. The man-made materials in common use are polyO-amidoethylene) ( = polyacrylamide ), poly( 1-amidoethylene-r-( sodium 1-carboxylatoethylene ) ( = partially hydrolyzed polyacrylamide ), poly(l-amidoethylene-r-( sodium 1-(2-methylprop-1N-yl-1-sulfonate)amidoethylene) (AMPS-acrylamide copolymer), and xanthan gum. Xanthan gum is a synthetic because no one finds a pool or river contaminated with Xanthomonas compestris that experiences the right sequence of solute to naturally produce the exocellular gum polymer. A fermenter is a man made object, a tree is not. 

The posterior multimodal association area is located at the junction of the parietal, temporal, and occipital lobes. It pools and integrates somatic, auditory, and visual stimuli for complex perceptual processing. As such, this area is involved primarily with visuospatial localization, language, and attention. Lesions here interfere with awareness of one s body position and of the space in which it moves as well as the ability to integrate and make sense of elements of a visual scene. In other words, these patients have normal visual acuity but cannot focus on an object of interest. 

In the European program COST (European CO-operation in the Field of Scientific and Technical Research) 8.41 Biological and Biochemical Diversity of Hydrogen Metabolism the main objective is to pool interrelated European expertise in order to understand the structural and molecular basis of the functions, as well as the factors that influence the activity and stability of hydrogenase enzymes. 

An earlier study on the speciation of heavy metals and geochemical mapping of the total metal content of the surface soils of Delhi7 showed the total Al content to vary between 1.87 to 5.34% with a mean of 3.57%. In view of the above, the objective of this research was to ascertain primarily the status of Aluminum in Delhi soils by studying its chemical speciation in the soil profile in order to improve the understanding of its distribution in the solid-phase pool of the soil. More precisely, the objectives were ... 

Two spirals as an art object for a public space -designed for the square in front of the city hall in Wiesbaden. The dates of historical events from the first millennium AD are engraved in the inner rim of the smaller spiral, dates telling the story of the second millennium are engraved in the larger one. Jets of water around the objects create rainbow spectra in the sunlight the pool is made of black granite. 

FIGURE 5.4 Linear discriminant scores dj for group j by the Bayesian classification rule based on (Equation 5.2). mj, mean vector of all objects in group j Sp1, inverse of the pooled covariance matrix (Equation 5.3) x, object vector (to be classified) defined by m variables Pj, prior probability of group j. 

The group means and covariances can also be estimated robustly, for example, by the minimum covariance determinant (MCD) estimator (see Section 2.3.2). The resulting discriminant rule will be less influenced by outlying objects and thus be more robust (Croux and Dehon 2001 He and Fung 2000 Hubert and Van Driessen 2004). Note that Bayes discriminant analysis as described is not adequate if the data set has more variables than objects or if the variables are highly correlating, because we need to compute the inverse of the pooled covariance matrix in Equation 5.2. Subsequent sections will present methods that are able to deal with this situation. 

An easily visualised example of a transverse wave is that obtained when a stone is dropped into a pool of water. The disturbance, or water wave, can be seen spreading across the surface in the form of circular crests of increasing radius. Any objects in the pool (e. g. 

One Cohort III interviewee at an historically black college believes that industry s review process is more objective I would say that industry more so than.(federal agency) administers funds on an equitable basis without regard to race because of the bottom line. We got money mostly from industry because it was just opening up to hire blacks... But there was a limited talent pool. One Cohort III interviewed made this plea 10,000 grant would help me a lot in my research but I can t get that from (federal agency). ... 

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