# A NOTE ON THE LEE–CHANG–PHAM–SONG SOFTWARE RELIABILITY MODEL

 Title A NOTE ON THE LEE–CHANG–PHAM–SONG SOFTWARE RELIABILITY MODEL Publication Type Journal Article Year of Publication 2018 Authors RAHNEVA OLGA, KISKINOV HRISTO, MALINOVA ANNA, SPASOV GEORGI Journal Neural, Parallel, and Scientific Computations Volume 26 Issue 3 Start Page 297 Pagination 14 Date Published 11/2018 ISSN 1061-5369 Keywords 41A46 Abstract In this paper we study the Hausdorff approximation of the shifted Heaviside step function $h_{t_0}(t)$ by sigmoidal function based on the Lee--Chang--Pham--Song cumulative function and find an expression for the error of the best approximation. We give real examples with small on--line data provided by IBM entry software package using the model. The potentiality of the software reliability models is analyzed. Lee--Chang--Pham--Song's idea of including the characteristic $t^{\ast}$ (the time when debugging starts after modifying the code causing syntax errors) in the study of models in debugging theory can be successfully expanded. For instance, for the Goel (1980) software reliability model. URL https://acadsol.eu/npsc/articles/26/3/6.pdf DOI 10.12732/npsc.v26i3.6 Refereed Designation Refereed Full Text REFERENCES [1] D. H. Lee, I. H. Chang, H. Pham, K. Y. Song, A software reliability model considering the syntax error in uncertainty environments, optimal release time, and sensitivity analysis, Appl. Sci., 8, (2018), 1483. [2] F. Hausdorff, Set Theory (2 ed.) (Chelsea Publ., New York, (1962 [1957]) Republished by AMS-Chelsea, (2005), ISBN: 978-0-821-83835-8. [3] M. Ohba, Software reliability analysis models, IBM J. Research and Development, 21, No. 4 (1984). [4] H. Pham, System Software Reliability, In: Springer Series in Reliability Engineering, Springer-Verlag London Limited (2006). 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