Client-server model

A hands-on experience with the method is possible via the SPINUS web service [48. This service uses a client-server model. The user can draw a molecular structure within the web browser workspace (the client), and send it to a server where the predictions are computed by neural networks. The results are then sent back to the user in a few seconds and visualised with the same web browser. Several operations and different types of technology arc involved in the system ... 

As network connectivity improved within the PC operating systems, client/server computing became possible. Instead of performing all of the work on a single, multi-user computer, you could now distribute the work across many computers. In the client/server model, adding a PC to the network increases the overall processing power of the system. The... 

Even so, working HTML FORMs is somewhat primitive compared to other GUIs designed for high bandwidth interactivity. Many of these limitations have been relieved by the availability of Java, JavaScript, plugins and helper applications. Likewise, the availability of cookies has eased the limitations of the underlying user-context-free HTTP/HTML client-server model. 

A significant concept of the client server model is to extend the scope of the application to function in an enterprise-wide (possibly worldwide) network of interconnected LANs, which allow LIMS and other applications following the client/server model to be operable and administrable on a much larger scale than either LAN or central processing models. 

The client/server model often allows easier integration with other network applications (eg, finance, project management, or human resources) which typically operate in the environment of the server component of the client/server system. Client/server can be gradually introduced in an existing minicomputer environment, often with litde adverse incremental impact in terms of retraining and additional cost. 

For these reasons, the desktop and client server models are expected to increase in percentage of LIMS software offerings and installed base in the... 

A totally different approach respects the idea that a Virtual Reality application that has basically the same state of its domain objects will render the same scene, respectively. It is therefore sufficient to distribute the state of the domain objects to render the same scene. In a multi-screen environment, the camera on the virtual scene has to be adapted to the layout of your projection system. This is a very common approach and is followed more or less, e.g., by approaches such as ViSTA or NetJuggler [978]. It is called the master-slave, or mirrored application paradigm, as all slave nodes run the same application and all user input is distributed from the master node to the slave nodes. All input events are replayed in the slave nodes and as a consequence, for deterministic environments, the state of the domain objects is sjmchronized on all slave nodes which results in the same state for the visualization. The master machine, just like the client machine in the client-server approach, does all the user input dispatching, but as a contrast to the client-server model, a master machine can be part of the rendering environment. This is a consequence from the fact that all nodes in this setup merely must provide the same graphical and computational resources, as all calculate the application state in parallel. 

THE EVENT-TRIGGERED (ET) model of computation is presented as a generalization of the time-triggered (TT) approach. It supports hard real-time and flexible soft real-time services. The ET model is built upon a number of key notions temporal firewalls, controlled objects, temporarily valid state data, and unidirectional communications between isolated subsystems. It uses the producer/consumer rather than client/server model of interaction. In addition to describing a systems model and computation model, this article considers issues of schedu-labiUty and fault tolerance. The ET model is not radically different from the TT approach (as in many systems most events will originate from clocks) but it does provide a more appropriate architecture for open adaptive applications. 

The software architecture that links the processes together is best described as a set of producer-consumer relations. The more general client-server model of interaction is not well suited to real-time systems (Kopetz, 1998). In particular the server is not easily made aware of the temporal requirements of the client. With the producer-consumer model, data flow and control flow (via event chains releasing a sequence of precedence related processes) allows an end-to-end temporal requirement to be specified and subsequently verified. 

Along with the increasing use of microcomputers, there has also been an increase in the need for trained workers because companies need to be able to share information. This need for sharing information was one of the driving forces in the development of the Internet and the client-server model common to Web architecture that now allows workers to share files and access centralized databases. 

Distributed system Any system in which a number of independent interconnected processes can cooperate (for example processes on more than one computer). The client/server model is one of the most popular forms of distribution in use today. In this model, a client initiates a distributed activity and a server carries out that activity. 

The REST-based approach is another paradigm of SOA implementation, known as Resource Orientation Architecture (ROA), which follows the classical client/server model. It considers a service as a resource that can be accessed through the Web using traditional HTTP requests. These resources can be manipulated using the CRUD (Create, Read, Update, Delete) style via the typical HTTP methods, namely GET to request/retrieve a resource, POST to modify/update a resource, PUT to create a resource and DELETE to remove a resource. In the context of SURV-TRACK, the service provider or simply the server i.e. amobile robot or a sensor node) creates a resource for each service they provide and makes it accessible to service consumers or simply clients (i.e. control station) through a Uniform Resource Identifier... 

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