The philosophy of science is the branch of philosophy that studies the philosophical systems, and the implications of science, whether natural science (physics, biology, etc) or social sciences (psychology, economy , etc.). Philosophy of science is closer to the epistemology and the ontology, two areas in which it borrows a lot and raises new questions (Creswell, 2003).
Paradigm
A paradigm is a representation of the world, a way of seeing things, a consistent pattern of vision of the world based on a set (matrix disciplinary or theoretical model of thought). It is a form of rail of thought whose laws should not be confused with those of another paradigm and, if necessary, can also hinder the introduction of new better solutions(Dash, 2005).
Ontology
Ontology is the branch of philosophy that addresses the universal basis, the principles of existence, structure and pattern. In essence, it expresses picture of the world which corresponds to the level of knowledge of reality, and are recorded in the philosophical categories, typical for this era, and also to a particular philosophical tradition (materialism or idealism, etc.). In this sense, every philosophy and general theoretical system necessarily based on certain ontological representations that make it meaningful sustainable basis and are subject to change as development of knowledge.
Epistemology
Epistemology, the branch of philosophy that studies the nature of knowledge and the problem of its capabilities, the relationship of knowledge to reality, we investigate general background knowledge; identify the conditions for its reliability and validity (Elliott, 2008). Unlike psychology, physiology of higher nervous activity, and the other sciences, etc., as a philosophical discipline, not individual analyzes, operating in the mind mechanisms to a particular subject come to a certain cognitive outcome, and general grounds, giving an opportunity to consider this result as knowledge, express the real, the true state of affairs. ...