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  2. Non-recurring engineering - Wikipedia

    en.wikipedia.org/wiki/Non-recurring_engineering

    Non-recurring engineering ( NRE) cost refers to the one-time cost to research, design, develop and test a new product or product enhancement. When budgeting for a new product, NRE must be considered to analyze if a new product will be profitable. Even though a company will pay for NRE on a project only once, NRE costs can be prohibitively high ...

  3. Eternal return - Wikipedia

    en.wikipedia.org/wiki/Eternal_return

    Eternal return. Eternal return (or eternal recurrence) is a philosophical concept which states that time repeats itself in an infinite loop, and that exactly the same events will continue to occur in exactly the same way, over and over again, for eternity. In ancient Greece, the concept of eternal return was most prominently associated with ...

  4. Revenue stream - Wikipedia

    en.wikipedia.org/wiki/Revenue_stream

    Revenue stream. A revenue stream is a source (or category of sources) of revenue of a company, other organization, or regional or national economy. In business, a revenue stream is generally made up of either recurring revenue, transaction-based revenue, project revenue, or service revenue. In government, the term revenue stream often refers to ...

  5. Recurrence relation - Wikipedia

    en.wikipedia.org/wiki/Recurrence_relation

    Definition. A recurrence relation is an equation that expresses each element of a sequence as a function of the preceding ones. More precisely, in the case where only the immediately preceding element is involved, a recurrence relation has the form. where. is a function, where X is a set to which the elements of a sequence must belong.

  6. Historic recurrence - Wikipedia

    en.wikipedia.org/wiki/Historic_recurrence

    Historic recurrence is the repetition of similar events in history. [a] [b] The concept of historic recurrence has variously been applied to overall human history (e.g., to the rises and falls of empires ), to repetitive patterns in the history of a given polity, and to any two specific events which bear a striking similarity. [4]

  7. Return period - Wikipedia

    en.wikipedia.org/wiki/Return_period

    A return period, also known as a recurrence interval or repeat interval, is an average time or an estimated average time between events such as earthquakes, floods, [1] landslides, [2] or river discharge flows to occur. It is a statistical measurement typically based on historic data over an extended period, and is used usually for risk analysis.

  8. Recurrent neural network - Wikipedia

    en.wikipedia.org/wiki/Recurrent_neural_network

    A recurrent neural network ( RNN) is one of the two broad types of artificial neural network, characterized by direction of the flow of information between its layers. In contrast to the uni-directional feedforward neural network, it is a bi-directional artificial neural network, meaning that it allows the output from some nodes to affect ...

  9. Subscription business model - Wikipedia

    en.wikipedia.org/wiki/Subscription_business_model

    For its use in religion, see Confessional subscription. The subscription business model is a business model in which a customer must pay a recurring price at regular intervals for access to a product or service. The model was pioneered by publishers of books and periodicals in the 17th century, [1] and is now used by many businesses, websites ...