کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
803306 904628 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Semi-Markov modeling of dependability of VoIP network in the presence of resource degradation and security attacks
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Semi-Markov modeling of dependability of VoIP network in the presence of resource degradation and security attacks
چکیده انگلیسی

Nowadays VoIP has become an evolutionary technology in telecommunications. Hence it is very important to study and enhance its dependability attributes. In this paper, an analytical dependability model for VoIP is proposed. The study is focused on analyzing the combined effects of resource degradation and security breaches on the Quality of Service (QoS) of VoIP, to enhance its overall dependability. As a preventive maintenance policy to prevent or postpone software failures which cause resource degradation, software rejuvenation is adopted. The dependability model is analyzed using semi-Markov process which captures the effects of non-Markovian nature of the time spent at various states of the system. The steady-state as well as the time-dependent analysis of the dependability model is presented. The steady-state results are obtained analytically, whereas the time-dependent results are obtained from simulation. Also, the analytical model is validated via simulation. The model analysis using a numerical example indicates the feasibility of our approach. Various dependability attributes such as availability, reliability and confidentiality are also obtained. A comparative study is also done between our proposed model and the existing models.


► Developed an analytical framework of dependability model.
► Comparison is made with numerical illustration.
► Our analytical model is validated via simulation results.
► Time-dependent dependability attributes are obtained from simulation results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reliability Engineering & System Safety - Volume 96, Issue 12, December 2011, Pages 1627–1636
نویسندگان
, ,