Efficiency server-client

In this chapter, we extend the one-dimensional MRTM transport and adsorption model (Zeng et al., 2002 Selim et al., 1990) to three-dimensional applications, using the altemating-direction-implicit (ADI) numerical algorithm to reduce computational complexity. We also discuss the development of a web-based system with a user-friendly interface providing client-side and server-side computing applications and web-based visualization functionality. The accuracy and efficiency issues of solution algorithms will be addressed in future publications. 

For reasons of interoperability, the Ontology Web Language (OWL) [546] standard, as already used for OntoCAPE (Subsect. 2.2.4), would have been the first choice for the representation of ontologies. However, current OWL-based ontology repositories do not offer an efficiently searchable storage in (relational) databases, nor do they easily support client/server-based architectures to, e.g., facilitate update synchronizations. 

The RDBMS is installed and runs on a computer that functions as a database server. Any SQL commands are executed on the server by the RDBMS. Functions written in SQL or in any of the procedural languages mentioned above are also executed by the RDBMS. This has the advantage that the data tables used by these SQL commands or procedural functions are under the control of the server. This is the most efficient way to access the data. The disadvantage is that the server may have many requests to handle from many users. Another way to operate on data tables is indirectly, using a client program typically (although not necessarily) run from another computer. 

One disadvantage of using client programs is that data must be transferred to and from the server. Depending on how much data is required, this can cause a client program to run less efficiently than a server function run as an extension of the RDBMS. 

Thus in applications where there are a few servers (for centralized data process) and a great number of distributed portable clients (for data collection), that need to be cheap, small and have minor power consumption without great concern about throughput, like in e-voting, the adoption of CMAC for MAC generation seems to be ideal since it will result to efficient... 

The PaperCP system is an extension of the Classroom Presenter system (Fig. 3), which employs wirelessly connected Tablet PCs for the two-way instructor-student communication. The instructor Tablet PC acts as a server, while the student Tablet PCs are clients. The individual delivery channel is implemented with IP multicast, through which all slides of a lecture can be efficiently delivered from the server to each student device at the beginning of the class. When the instructor reaches a slide with a prepared question, each student writes a response directly on their Tablet PC and digitally submits it via point-to-point connections to the instructor station. This is the anonymous submission channel. In addition, a public display conwwwnected to the instructor station is used as the shared delivery channel, which the instructor uses to display selected student submissions and offer her comments. 

Today networks are used to connect operation computers of instruments with one or more laboratory computers (with a LIMS). These are connected to higher computers of the organization. Many LIMSs use a client server architecture. For the ordinary user of a LIMS the hardware platform is not important. A LIMS manager has to consider backup, archiving, removal of failures, support, and other aspects. If an efficient EDP department works in the organization, it should operate the hardware, but if there are problems the LIMS manager must be able to cope with them. 

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