پاورپوینت کامل OCTYPE html> ۶۹ اسلاید در PowerPoint

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پاورپوینت کامل OCTYPE html> ۶۹ اسلاید در PowerPoint

اسلاید ۴: Architectural design processSystem structuringThe system is decomposed into several principal sub-systems and communications between these sub-systems are identifiedControl modellingA model of the control relationships between the different parts of the system is establishedModular decompositionThe identified sub-systems are decomposed into modules

اسلاید ۵: Sub-systems and modulesA sub-system is a system in its own right whose operation is independent of the services provided by other sub-systems.A module is a system component that provides services to other components but would not normally be considered as a separate system

اسلاید ۶: Architectural modelsStructure, control and modular decomposition may be based on a particular model or architectural styleHowever, most systems are heterogeneous in that different parts of the system are based on different models and, in some cases, the system may follow a composite modelThe architectural model used affects the performance, robustness, distributability and maintainability of the system

اسلاید ۷: System structuringConcerned with decomposing the system into interacting sub-systemsThe architectural design is normally expressed as a block diagram presenting an overview of the system structureMore specific models showing how sub-systems share data, are distributed and interface with each other may also be developed

اسلاید ۸: Architectural Style

اسلاید ۹: ۱. Main Program With Subroutines

اسلاید ۱۰: ControlInputShiftSortOutputstoreshiftssortedoutputProcedure callAccess to data structurei/oinput

اسلاید ۱۱: ۲. Abstract Data TypeControlInputStoreShiftSortOutputoutputoutput

اسلاید ۱۲: StoreinitialStore: PutChar(r,w,c,d):CloseStore: it is called after all inputlines have been stored through successive calls of PutChar()Lines(): delivers the number of lines storesWords(r)Chars(r,w)Char(r,w,c)InputCall Store.initialStore()Read from input and call PutChar(…)Call CloseStore()

اسلاید ۱۳: ShiftShiftLines()ShiftWords(l)ShiftChars(l,w)ShiftChar(l,w,c)SortiniSortgetIndex(w)

اسلاید ۱۴: ۳. Implicit InvocationControlInputMakeShiftSortOutputStoreShiftoutputImplicit callinputThe MakeShift module is no explicitly called

اسلاید ۱۵: ۴. Pipe and FilterInputShiftSortOutputinputoutput

اسلاید ۱۶: ۵. RepositorySub-systems must exchange data. This may be done in two ways:Shared data is held in a central database or repository and may be accessed by all sub-systemsEach sub-system maintains its own database and passes data explicitly to other sub-systemsWhen large amounts of data are to be shared, the repository model of sharing is most commonly used

اسلاید ۱۷: Conti.

اسلاید ۱۸: Conti.AdvantagesEfficient way to share large amounts of dataSub-systems need not be concerned with how data is produced Centralized management e.g. backup, security, etc.Sharing model is published as the repository schemaDisadvantagesSub-systems must agree on a repository data model. Inevitably a compromiseData evolution is difficult and expensive

اسلاید ۱۹: ۶. Layered

اسلاید ۲۰: ۷. Client-serverDistributed system model which shows how data and processing is distributed across a range of componentsSet of stand-alone servers which provide specific services such as printing, data management, etc.Set of clients which call on these servicesNetwork which allows clients to access servers

اسلاید ۲۱: Conti.AdvantagesDistribution of data is straightforwardMakes effective use of networked systemsEasy to add new servers or upgrade existing serversDisadvantagesNo shared data model so sub-systems use different data organization. Data interchange may be inefficientNo central register of names and services – it may be hard to find out what servers and services are available

اسلاید ۲۲: Control Model

اسلاید ۲۳: Control modelsAre concerned with the control flow between sub-systems. Distinct from the system decomposition modelCentralized controlOne sub-system has overall responsibility for control and starts and stops other sub-systemsEvent-based controlEach sub-system can respond to externally generated events from other sub-systems or the system’s environment

اسلاید ۲۴: ۱. Centralized controlA control sub-system takes responsibility for managing the execution of other sub-systemsCall-return modelTop-down subroutine model Control starts at the top of a subroutine hierarchy and moves downwards. Applicable to sequential systemsManager modelOne system component controls the stopping, starting and coordination of other system processes. Applicable to concurrent systems.

اسلاید ۲۵: Call-return model

اسلاید ۲۶: A centralized control model for a real-time system control

اسلاید ۲۷: ۲. Event-driven systemsDriven by externally generated events where the timing of the event is outside the control of the sub-systems which process the eventIn centralized control models, control decisions are usually determined by the value of some system state variab