Performance evaluation criteria

Identify and determine performance/evaluation criteria. A key element in validation is the determination of what constitutes acceptable output, along with the determination that the quality of output is consistent with a process that is in control. Under normal operating conditions, there should thus be little variability in the quality of the output. Examples of easily measured performance criteria for the validation of the capping operation are cap torque and misaligned caps. 

As part of the evaluation of results of the intercomparison exercises for major and trace elements, NRC assigns a performance evaluation criteria based on the number of times results reported by a laboratory fall within acceptable criteria. The percentage of laboratories achieving superior or good performances has increased since 1991 from 46% to 83% (Figure 13.3). Superior-rated laboratories submitted results for most analytes within the 95% confidence intervals goodrated laboratories submitted many results within the accepted range with a minimum number of outliers (16). 

R. L. Webb and A. E. Bergles, Performance Evaluation Criteria for Selection of Heat Transfer Surface Geometries Used in Low Reynolds Number Heat Exchangers, in Low Reynolds Number Convection in Channels and Bundles, S. Kakac, R. H. Shah, and A. E. Bergles eds., Hemisphere, Washington, DC, and McGraw-Hill, New York, 1982. 

R. L. Webb, Performance Evaluation Criteria for Enhanced Tube Geometries Used in Two-Phase Heat Exchangers, in Heat Transfer Equipment Design, R. K. Shah, E. C. Subbarao, and R. A. Mashelkar eds., Hemisphere, New York, 1988. 

A comparative analysis among the alternatives to assess the relative performance of each alternative with respect to each evaluation criterion... 

No clear guidelines exist for the appropriate use of performance impairment test systems for work eligibility. There is general agreement that in situations in which worker or public safety is potentially influenced by a worker s performance, impairment test systems are justified. However, no clear criteria for identifying safety issues are available.9 The use of such tests as a means of managing worker productivity is less universally accepted, and if used as an employee evaluation criterion, such tests should be given careful scrutiny. 

Each alternative concept is compared to the baseline datum relative to several evaluation criteria, in this case, solution-level performance and perception expectations. Each evaluation criterion becomes a row in the Pugh Matrix. When using the Pugh Matrix to evaluate initial innovation ideas relative to some job to be done, the list of evaluation criteria are synonymous... 

Results for the first case are shown in Table 1. The reactive model objective function has a lower value than that obtained from the proactive approach. This stems from the fact that unit reallocation is allowed in the reactive model which permits further improvement in the objective function. In case the uncertainty unveils in the time range of the proactive model scenarios, it seems that the closer to the beginning of the time horizon the uncertainty unveils, the better evaluation criterion values in the proactive approach. However, the closer to the end of the time horizon, the better the reactive model schedules performs. 

In this work, a comparison between proactive and reactive approaches has been carried out in terms of a new proposed evaluation criterion that considers earliness and tardiness, as well as rescheduling costs. This cost takes into account the total deviation from initial starting times and a batch reallocation cost which is proportional to the objective function. According to the presented case studies, the further from initially considered values uncertainty unveils, the better the reactive schedule performs according to the evaluation criterion. On the contrary, if uncertainty unveils as forecasted, and early in the time horizon, the best choice is the proactive approach. Future work will be focused on the validation and further improvement of the proactive-reactive control scheme. 

Determine the standards (thresholds) for each criterion. These can reflect universal standards established for the institution s clinical program or expectations of an individual clinical pharmacist. The standards establish departmental expectations regarding the extent to which the individual performs each criterion. The expectations should be objective and expressed clearly. Some sites may decide not to use standards however, they should be cautioned that objective evaluation may be difficult without standards. 

Dispenses information Is primary learning resource Stresses inquiry Groups students according to ability (norm- referenced) Focuses on information Evaluates via classroom testing Facilitates learning experience Allows participants to serve as learning resources Stresses practical application Tries to help all participants perform to specified level (criterion-referenced) Focuses on performance Evaluates via on-the-job performance assessment... 

Different specimens may be subjected to the sequences of tests. Also the evaluation criterion for the water immersion test prescribed in para. 730 is different from the criterion for the other tests. The evaluation of the package with regard to shielding and containment integrity must be performed after completing each test sequence. 

From an economic point of view, the criterion of the transport system performance evaluation is the direct cost of transportation (Mashayekh et al. 2011). Taking into account previously formulated markings criterion can be given as follows ... 

From an economic point of view, the criterion of performance evaluation of the transport system... 

With regard to employee performance evaluations, WSRC should ensure that performance evaluations for appropriate employees are based on nuclear safety dedication and include performance standards related to the maintenance of a positive safety culture attitude. Pending the above, acceptable satisfaction of this criterion remains an open item. 

Elastic Properties. The abiUty of a fiber to deform under below-mpture loads and to return to its original configuration or dimension upon load removal is an important performance criterion. Permanent deformation may be as detrimental as actual breakage, rendering a product inadequate for further use. Thus, the repeated stress or strain characteristics are of significance in predicting or evaluating functional properties. 

For the reasons already discussed in Section III, our solution space consists of hyperrectangles in the decision space, X g I, not single points, X. The corresponding performance criterion used to evaluate solutions, i/i, is the expected y value within X ... 

The design methods de.scribed above rely on correlations of the overall reactor average quantities obtained from experimental tanks of different scales. The most important deficiency of these methods is that local effects are not taken into consideration, while these might be responsible for the overall reactor performance. Accordingly, if none of the above scale-up criteria is found satisfactory (see e.g. data of Middleton et ai, 1986) a more fundamental approach must be applied, although not necessarily as complex as the one presented in Section 5.4.S.2. Such an approach was presented by Paul et al. (1971) who found that the yield of the desired intermediate in a system of consecutive reactions (iodination of L-tjrosine) correlates reasonably with fluctuations of the velocity, So, these fluctuations could be chosen as a criterion for scale-up of the reactor. The average value for u in the upper part of the tank was evaluated from ... 

Once the flowsheet structure has been defined, a simulation of the process can be carried out. A simulation is a mathematical model of the process that attempts to predict how the process would behave if it were constructed (Figure 1.2b). Having created a model of the process, the flowrates, compositions, temperatures and pressures of the feeds can be assumed. The simulation model then predicts the flowrates, compositions, temperatures, and pressures of the products. It also allows the individual items of equipment in the process to be sized and predicts, for example, how much raw material is being used or how much energy is being consumed. The performance of the design can then be evaluated. There are many facets to the evaluation of performance. Good economic performance is an obvious first criterion, but it is certainly not the only one. 

An important point is the evaluation of the models. While most methods select the best model at the basis of a criterion like adjusted R2, AIC, BIC, or Mallow s Cp (see Section 4.2.4), the resulting optimal model must not necessarily be optimal for prediction. These criteria take into consideration the residual sum of squared errors (RSS), and they penalize for a larger number of variables in the model. However, selection of the final best model has to be based on an appropriate evaluation scheme and on an appropriate performance measure for the prediction of new cases. A final model selection based on fit-criteria (as mostly used in variable selection) is not acceptable. 

Based on the optimization criterion, SpinPro can select the most appropriate rotor. For example, suppose the investigator has a relatively large sample volume, all of which needs to be processed as soon as possible. The "minimize cumulative run time" criterion would be the appropriate choice. SpinPro would then initiate the following rotor selection procedure SpinPro determines the total sample volume based on inputs of the sample volume, the current concentration of the sample, and a correction for any pre-run dilutions of the sample. Next, consideration is made for whether tubes or bottles will be used. The program then evaluates rotors for the number of tube positions and the amount of sample per tube. At this point, SpinPro will have estimated for each rotor the number of runs required to process the sample. SpinPro then estimates the run time for each rotor to perform a single run. Based on these estimates, SpinPro selects the rotor that will give the shortest total run time when the run time is summed over the total number of runs. Similarly, the investigator can select any of the optimization criteria and initiate a variety of precise rotor selection procedures. 

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