Cycle Model The Systems Development Life Cycle model was developed as a structured approach to information system development that guides all the processes involved from an initial feasibility study through to maintenance of the finished application. SDLC models take a variety of approaches to development. Some of these life cycle models include: The Waterfall Model: A classic SDLC model‚ with a linear and sequential method that has goals for each development phase. The waterfall model simplifies
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OSI vs. TCP/IP Model Comparison & Overview The Open Systems Interconnection (OSI) reference model created in the late seventies and used today consists of seven layers that include Application‚ Presentation‚ Session‚ Transport‚ Network‚ Data Link and Physical. The Application layer often dubbed Layer 7 is the most common layer to end users and can consist of applications such as Microsoft’s Internet Explorer or other browser software. The Presentation layer provides a translation of application
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The linear probability model‚ ctd. When Y is binary‚ the linear regression model Yi = β0 + β1Xi + ui is called the linear probability model. • The predicted value is a probability: • E(Y|X=x) = Pr(Y=1|X=x) = prob. that Y = 1 given x • Yˆ = the predicted probability that Yi = 1‚ given X • β1 = change in probability that Y = 1 for a given ∆x: Pr(Y = 1 | X = x + ∆x ) − Pr(Y = 1 | X = x ) β1 = ∆x 5 Example: linear probability model‚ HMDA data Mortgage denial v. ratio of debt payments to income (P/I
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OSI Reference Model 1 - OSI Reference Model Network Reference Models A computer network connects two or more devices together to share information and services. Multiple networks connected together form an internetwork. Internetworking present challenges - interoperating between products from different manufacturers requires consistent standards. Network reference models were developed to address these challenges. A network reference model serves as a blueprint‚ detailing how communication
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System development life cycle models Waterfall Model The waterfall model is the simplest and most popular system development life cycle model for software engineering. In this model‚ each phase is organized in linear and sequential order. Once a phase is completed‚ one can then proceed to the development of the next phase. It must be noted however‚ that once a stage is completed‚ there is no turning back. The stages in the waterfall life cycle modal are as follows: • Requirements Analysis •
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Reinventing your business model Summary by Armen Sargsyan Business innovations have reshaped entire industries and redistributed billions of dollars of value. However‚ stories of business model innovation from well-established companies are rare as new business models often look unattractive to internal and external stakeholders. Business models consist of four interlocking elements that taken together
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TCP/IP Protocol Suite (Internet Model) Comparison of Network Models 1. OSI Model (Open System Interconnect) 2. Internet Model (TCP/IP Model) TCP/IP Model Application 5. Application Layer Presentation ISO Model Session 4. Transport Layer 3. Network Layer Transport Network 2. Host-to-Network Data Link 1. Physical Layer Physical 1 Comparison of Network Models TCP/IP is ussed in the Internet. Common mechanism that is gaining on/surpassing the OSI Model. Data Flow in TCP/IP Network Some
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FIEDLER CONTINGENCY MODEL The Fiedler contingency model is a leadership theory of industrial and organizational psychology developed by Fred Fiedler (born 1922)‚ one of the leading scientists who helped his field move from the research of traits and personal characteristics of leaders to leadership styles and behaviours. Two factors The first management style‚ Taylorists‚ assumed there was one best style of leadership. Fiedler’s contingency model postulates that the leader’s effectiveness
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The Biomedical model of health: The biomedical model of medicine has been around since the mid-nineteenth century as the predominant model used by physicians in diagnosing diseases. According to the biomedical model‚ health constitutes the freedom from disease‚ pain‚ or defect‚ thus making the normal human condition "healthy". The model’s focus on the physical processes‚ such as the pathology‚ the biochemistry and the physiology of a disease‚ does not take into account the role of social factors
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Business models Strategic management 2 - seminars 15.4.2013 Ivan Župič What is business model ? Definition A business model describes the rationale of how an organization creates‚ delivers‚ and captures value Business model building blocks Customer segments Value propositions Channels (communications‚ distribution‚ sales) Customer relationships Revenue streams Key resources Key activities Key partnerships Cost structure Customer Segments A business model may define one or several
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