Dependable software

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  • The scope, complexity, and pervasiveness of computer-based and controlled systems continue to increase dramatically. The consequences of these sys- tems failing can range from the mildly annoying to catastrophic, with serious injury occurring or lives lost, human-made and natural systems destroyed, security breached, businesses failed, or opportunities lost. As software assumes more of the responsibility of providing functionality and control in systems, it becomes more complex and more significant to the overall system performance and dependability...

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  • Chapter 20 - Critical systems development. In this chapter, the learning objectives are: To explain how fault tolerance and fault avoidance contribute to the development of dependable systems, to describe characteristics of dependable software processes, to introduce programming techniques for fault avoidance, to describe fault tolerance mechanisms and their use of diversity and redundancy.

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  • The relationship between the quality of a product and the organization responsible for the development of that product is multidimensional. The relationship depends upon many factors such as the business strategy and business structure of the organization, available talent, and resources needed to produce the product. It also depends upon the combination of activities selected by the organization to achieve the desired product quality.

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  • Content Chapter01 Software Process Models: Introduction, Main concepts, Software Process Models. The economies of all developed nations are dependent on software, more and more systems are software-controlled, Software engineering expenditure represents a significant part of GNP in all developed countries.

     

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  • Class & Object Diagrams - Software Design Methodology includes UML class diagrams; class diagrams vs object diagrams; relationships; dependency; association; association name; association multiplicity; multiplicity example; multiplicity symbols; association role names; classes versus objects; class diagram example; aggregation; inheritance (generalization); multiple inheritance.

     

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  • Software Architectures: Lecture 2 provides about Tactics, Architectural style, Availability tactics, Fault detection, Fault recovery, Fault reintroduction, Modifiability tactics, Prevent ripple effects, Dependency types, Syntax dependency, Semantics dependency.

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  • After my discussion of use cases, data modeling, and class-based models in Chapter 6, it’s reasonable to ask, “Aren’t those requirements modeling representations enough?” The only reasonable answer is, “That depends.” For some types of software, the use case may be the only requirements modeling representation that is required. For others, an object-oriented approach is chosen and class-based models may be developed. Chapter 7 provides knowledge of requirements modeling: Flow, behavior, patterns, and webapps.

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  • Chapter 3 - Critical systems. The learning objectives for this chapter include: To explain what is meant by a critical system where system failure can have severe human or economic consequence; to explain four dimensions of dependability - availability, reliability, safety and security; to explain that, to achieve dependability, you need to avoid mistakes, detect and remove errors and limit damage caused by failure.

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  • Chapter 9 - Critical systems specification. To explain how dependability requirements may be identified by analysing the risks faced by critical systems, to explain how safety requirements are generated from the system risk analysis, to explain the derivation of security requirements, to describe metrics used for reliability specification.

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  • Chapter 24 - Critical systems validation. This chapter presents the following content: Reliability validation, safety assurance, security assessment, safety and dependability cases.

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  • Testing and analysis activities occur throughout the development and evolution of software systems, from early in requirements engineering through delivery and subsequent evolution. Quality depends on every part of the software process, not only on software analysis and testing; no amount of testing and analysis can make up for poor quality arising from other activities.

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  • Models of data flow and dependence in software have many applications in software engineering, from testing to refactoring to reverse engineering,... Moreover, the basic algorithms used to construct data flow models have even wider application and are of particular interest because they can often be quite efficient in time and space.

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  • At the beginning, specialists tried to diagnose the stage of periodontal disease depending on the relation between the clinical appearances and the presence of some specific cell populations or specific matrix components (Havemose-Poulsen & Holmstrup, 1997; Romanos et al., 1993).

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  • Experts in every field of study depend on specialized tools. In the case of speech research and development, the dominant tools today are computer programs. In this article, we present an overview of key technical approaches and features that are prevalent today.

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  • An output of one step will be the input to another. Some inputs may be sourced from outside the project. These External Inputs (e.g., Standards, Project Initiation report of another project, etc.) must be identified. The project products and external inputs will primarily determine the step dependencies. Define the dependencies, and dependency type, between the steps. Steps within a stage are not necessarily finish-start, but may be in parallel or phased. Stages may also run in parallel with one another. Do not specify dependencies at the stage level.

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  • With database concepts and theories clearly explained in Oracle's context, readers quickly learn how to fully leverage Oracle's performance and scalability capabilities at every stage of designing and developing an Oracle-based enterprise application. The book is based on the author's more than ten years of experience working with Oracle, and is filled with dependable, tested, and proven performance optimization techniques.

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  • SOA is a collection of services. A service is a well-defined, self-contained function that does not depend on the state of other services. These services communicate with each other. The communication can involve either simple data passing or two or more services coordinating some activity. The communication requires some means of connecting services to each other.

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  • The CPU contains a special set of memory cells called registers that can be read and written to much more rapidly than the main memory area. There are typically between two and one hundred registers depending on the type of CPU. Registers are used for the most frequently needed data items to avoid having to access main memory every time data is needed. As data is constantly being worked on, reducing the need to access main memory (which is often slow compared to the ALU and control units) greatly increases the computer's speed....

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  • Chart the sequence of stages and steps to reflect the intrinsic and architectural dependencies inherent in the project. An output or product of one task will usually be the input to another, and this will be the primary driver in determining the task dependencies and workflow. Determine whether the successor task references (throughput) or updates (entry requirement) the input product. Some inputs may be sourced from outside the project. Identify these External Inputs (e.g., Long Range System Plan, Standards, Project Initiation report of another project, etc.).

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  • Energy efficiency is finally a common sense term. Nowadays almost everyone knows that using energy more efficiently saves money, reduces the emissions of greenhouse gasses and lowers dependence on imported fossil fuels. We are living in a fossil age at the peak of its strength. Competition for securing resources for fuelling economic development is increasing, price of fuels will increase while availability of would gradually decline.

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