Systems goals

At this point, a task analysis is performed. A "task" is defined as an activity oi performance (hat the operator sees as a unit either because of its performance character]stic.s or becau.se that activity is required as whole to achieve some part of the system goal. Only the tasks that are relevant lo the system safety are considered. A task analysis involves decomposition of each task into individual units of behavior. Unusually, this analy.sis tabulates information about each specific human aciiun. The format of such a table is not rigid - any style that allows easy retrieval ot the information can be used. The format reflects the level of detail and the type of task analysis performed. The analysis yields... 

The research is focused on future energy needs with near-zero emissions in coal-fueled power station applications. Key system goals include ... 

A fuel processor for PEFC application contains sulfur removal, an ATR-enhanced UOB reformer, advanced shift reactors, a steam generation system, a product gas cooler, a PROX system, a gas compressor, an air compressor, an anode-off gas oxidizer, and a control system. Goal efficiency (LHV H2 consumed by fuel cell/LHV fuel consumed by fuel processor) is 69 to 72%. H2 concentration is presently >50% (dry). 

Link Metrics to System Goals and Existing Performance... 

The experimental systems, goals, and methods in particular publications are very diverse, but there is a general agreement as to what variables have to be controlled to obtain meaningful results. Accordingly, Tables 4.1-4.6 have the following columns. 

As the reasoning of a human expert is goal-oriented and driven by the external situations, so the organization and the correct instantiation of the production rules inside a Knowledge Base depend on the system goal and on the external constraints. 

Table 2. Comparison of Current Status to 2005 Hydrogen Storage System Goals...

Molecule Crystal nucleus Crystal Crystallisation occm-s in a single step, intermediates are not isolable Polymorphism is imcommon but still a nuisance in particular systems Goals Understanding of intermolecular interactions and crystal packing, connections between molecular and crystal structm-e... 

Evaluate design for maximum reliability consistent with system goals. 

Level 1 System Purpose Assumptions Constraints Responsibilities Requirements l/F requirements System goals, high-level requirements, design constraints, limitations Preliminary Hazard Analysis, Review s... 

Different algorithms can be used at different scheduling levels or can be nested to achieve a particular system goal such as high throughput or quick response... 

Once defined the type of architecture to be used it is necessary to model the system goals as a part of the strategy. 

Van Lamsweerde A (2009) Requirements engineering from system goals to LIML models to... 

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