AN INTEGRATED REDUNDANT RELIABILITY OPTIMIZATION FRAMEWORK FOR COHERENT HYBRID SYSTEMS USING LAGRANGE MULTIPLIER, HEURISTIC, AND INTEGER PROGRAMMING APPROACHES SAI UMA SANKAR MANDAVILLI, SIDHAR AKIRI, SRINIVASA RAO VELAMPUDI, ARUN KUMAR SARIPALLI, BHAVANI KAPU, RAMADEVI SURAPATI Journal of Theoretical and Applied Information Technology, 2026 The overarching purpose of reliability engineering is to guarantee, within a certain time frame and set of circumstances, the proper operation of systems and its components. Integrating redundancy strategically while taking restrictions like mass, cost, and space needs into coherent system topologies improves system robustness, according to reliability theory. The impact of these limitations volume, weight, dimensions, and space on the improvement of system reliability is the primary emphasis of this study. Parts used in a typical representative coherent hybrid system are the focus of the inquiry. These parts are really taken from coherent systems, where dimensions, mass, and cost are critical for maintaining effective operation. The motor control unit, internal combustion engine, and electric generator must all go through thorough reliability testing. To solve this problem, we need to research and construct an integrated redundant reliability model in a coherent systems structure utilizing the Lagrange multiplier approach. This approach generates continuous-valued results for significant variables, including component count, individual and stage reliabilities, and overall system dependability. The work takes it a step further by using heuristic methods and integer programming to come up with integer-based solutions that are both realistic and useful. These strategies make the dependability research much more accurate and valuable.
Statistical Analysis of Dietary Patterns, Eating Habits, Demographic and Health Factors Influencing Lifestyle Disorders among Urban Adults: A Survey Based Study Iaeng International Journal of Applied Mathematics, 2026
OPTIMIZED RELIABILITY FRAMEWORK FOR SERIES-PARALLEL SYSTEMS: STRATEGIC REDUNDANCY ALLOCATION USING HAM AND IPM SOLUTIONS Journal of Theoretical and Applied Information Technology, 2025
Comparative Performance of Burr Type XII 3P, Dagum Type I 3P and Log-Logistic 3P Distributions in Modeling Ozone (O3), PM10 and PM2.5 Concentrations Arun Kumar Saripalli, Sridhar Akiri, Rekha Sarode, B. V. Nagarjuna Vasili, M. Ramanaiah Research Journal of Chemistry and Environment, 2025 This study investigates the suitability of three parameters continuous probability distributions-Burr Type XII 3P, Dagum Type I 3P and Log-Logistic 3P-in modeling secondary air pollutants: ozone (O₃), particulate matters (PM₁₀ and PM₂.₅) in Visakhapatnam, an urban region having rapid industrialization. By employing rigorous statistical techniques including maximum likelihood estimation (MLE) and bootstrapping, we estimate distribution parameters and validate model fit through diagnostic plots-skewness vs. kurtosis, P-P and Q-Q plots as well as goodness-of-fit test-statistics, such as Kolmogorov-Smirnov(KS), Anderson-Darling(AD) and Cramér von Mises(CvM) tests. Additional, performance metrics including Akaike information criterion(AIC), Bayesian information criterion(BIC), evaluation metrics like mean absolute error(MAE), mean absolute percentage error(MAPE), mean squared error(MSE), root mean squared error(RMSE) and coefficient of determination(R²) and cross-validation, were also applied to ensure model robustness. Results indicate that the Burr Type XII 3P distribution most effectively models the high variability and skewed nature of O₃ concentrations, while the Dagum Type I 3P distribution provides the best fit for PM₁₀ and both Burr Type XII 3P and Log-Logistic 3P distributions are suitable for PM₂.₅. These findings offer new insights into the behavior of secondary pollutants, supporting the development of robust air quality monitoring frameworks. R software facilitated all numerical analyses and visualizations of data suited to environmental data modeling.
Statistical Distribution Models for Airborne VOCs (Xylene, Toluene and Benzene) in Visakhapatnam using Burr XII 3P, Log-Logistic 3P and Dagum-I 3P Distributions Arun Kumar Saripalli, Sridhar Akiri, Rekha Sarode, Adilakshmi Siripurapu, M. Ramanaiah Research Journal of Chemistry and Environment, 2025 This study investigates the application of advanced statistical models for airborne Volatile organic compounds (VOCs)-specifically xylene, toluene and benzene-using air pollution data collected from the city Visakhapatnam from the year 2018 to 2022. To capture the non-normal distributional behavior of VOC concentrations, three flexible probability distributions were employed: Burr XII 3P, Log-Logistic 3P and Dagum-I 3P. Parameter estimation was performed via maximum likelihood estimation (MLE) while model validation was achieved through P–P and Q–Q plots. In order to identify the most suitable distribution for modeling the air pollutant data, three distinct goodness of fit test statistics and five model selection criteria were applied. The results demonstrate that the Dagum-I 3P distribution best fits xylene and benzene, while the Log-Logistic 3P model is optimal for the moderately skewed toluene concentrations. Cross-validation confirms these findings, highlighting the reliability of tailored distributional models for VOCs. The proposed distributions provide a robust framework for predicting air quality information and conducting accuracy assessments with all calculations and visual indications carried out with R-software. This work underscores the potential of pollutant-specific modeling for improved air quality assessment and management strategies, contributing to environmental health planning in urban-industrial areas.
AN INTEGRATED RELIABILITY MODEL FOR SERIES-PARALLEL SYSTEMS: OPTIMIZING REDUNDANCY ALLOCATION WITH INTERNAL RATE OF RETURN USING HEURISTIC AND DYNAMIC PROGRAMMING APPROACHES Journal of Theoretical and Applied Information Technology, 2025
Fuzzy Risk Analysis Based on Ranking Fuzzy Numbers by a Novel Defuzzification Technique with Vagueness in Lower Decision Levels Iaeng International Journal of Applied Mathematics, 2025
Statistical Modeling of Daily Average Levels of Carbon Monoxide (CO), Sulfur Dioxide (SO2), and Nitric Oxide (NO) in Visakhapatnam Using the Burr-XII Distribution Iaeng International Journal of Applied Mathematics, 2025
Ordering Fuzzy Numbers by a Novel Defuzzification Technique Using Volumes-An Application to Type 2 Diabetes Risk Assessment Iaeng International Journal of Computer Science, 2025
Optimizing Parallel-Series Configurations for Reliability: Enhancing Integrated Redundancy Iaeng International Journal of Applied Mathematics, 2025
A DETAILED CASE STUDY OF AN INTEGRATED REDUNDANT RELIABILITY MODEL USING THE PARALLEL-SERIES CONFIGURATION Journal of Theoretical and Applied Information Technology, 2024
Integrated Redundant Reliability Model using k out of n Configuration with Integer Programming Approach Statistics and Applications, 2024
An Integrated Redundant Reliability Optimization Framework for Coherent Hybrid Systems Using Lagrange Multiplier, Heuristic, And Integer Programming Approaches RS Sai Uma Sankar Mandavilli, Sidhar Akiri, Srinivasa Rao Velampudi, Arun ... Journal of Theoretical and Applied Information Technology 104 (07), 245-259 , 2026 2026
Modeling daily ambient concentration of nitrogen oxide (NO2) and Ammonia (NH3) using 3P Dagum-Type-I distribution RM Arun Kumar Saripalli, Sridhar Akiri, Ramadevi, K Laxmi Research Journal of Chemistry and Environment 30 (04), 01-12 , 2026 2026
Statistical Analysis of Dietary Patterns, Eating Habits, Demographic and Health Factors Influencing Lifestyle Disorders among Urban Adults: A Survey Based Study AK Saripalli, GS Kumar, K Neelima, S Akiri, PE Satyanarayana IAENG International Journal of Applied Mathematics 56 (3), 1202-1213 , 2026 2026
Optimizing Parallel-Series Configurations for Reliability: Enhancing Integrated Redundancy CC Sridhar Akiri, Bhavani Kapu, Peddi Phani Bushan Rao, Arun Kumar Saripalli International Journal of Applied Mathematics 55 (10), 3104-3111 , 2025 2025
Optimized Reliability Framework for Series-Parallel Systems: Strategic Redundancy Allocation Using HAM And IPM Solutions BKPPR Sridhar Akiri, Ramadevi Surapati, Srinivasa Rao Velampudi, Arun Kumar ... Journal of Theoretical and Applied Information Technology 103 (13), 4896-4911 , 2025 2025
Fuzzy Risk Analysis Based on Ranking Fuzzy Numbers by a Novel Defuzzification Technique with Vagueness in Lower Decision Levels PPB Rao, BD Rani, A Sridhar IAENG International Journal of Applied Mathematics 55 (5), 1003-1013 , 2025 2025
Comparative Performance of Burr Type XII 3P, Dagum Type I 3P and Log-Logistic 3P Distributions in Modeling Ozone (O₃), PM₁₀ and PM₂.₅ Concentrations RM Arun Kumar Saripalli, Sridhar Akiri, Rekha Sarode, Vasili B V Nagarjuna Research Journal of Chemistry and Environment 29 (04), 39-56 , 2025 2025
Statistical Modeling of Daily Average Levels of Carbon Monoxide (CO), Sulfur Dioxide (SO2), and Nitric Oxide (NO) in Visakhapatnam Using the Burr-XII Distribution AK Saripalli, S Akiri, S Rekha IAENG International Journal of Applied Mathematics 55 (4), 742-753 , 2025 2025
Statistical Distribution Models for Airborne VOCs (Xylene, Toluene and Benzene) in Visakhapatnam using Burr XII 3P, Log-Logistic 3P and Dagum-I 3P Distributions RM Arun Kumar Saripalli, Sridhar Akiri, Rekha Sarode, Adilakshmi Siripurapu Research Journal of Chemistry and Environment 29 (03), 39-51 , 2025 2025
Ordering Fuzzy Numbers by a Novel Defuzzification Technique Using Volumes-An Application to Type 2 Diabetes Risk Assessment. P Sasikala, PPB Rao, L Abdullah, A Sridhar IAENG International Journal of Computer Science 52 (3) , 2025 2025
An Integrated Reliability Model for Series-Parallel Systems: Optimizing Redundancy Allocation with Internal Rate of Return Using Heuristic and Dynamic Programming Approaches SUSMSRV Ramadevi Surapati, Sridhar Akiri, Bhavani Kapu, Arun Kumar Saripalli Journal of Theoretical and Applied Information Technology 103 (04), 1487-1502 , 2025 2025
Enhancing Reliability of Series-Parallel Systems: A Novel Mathematical Model for Redundancy Allocation BK Ramadevi Surapati, Sridhar Akiri, Srinivasa Rao Velampudi , Vasili B.V ... European Journal of Pure and Applied Mathematics 18 (01), 01-23 , 2025 2025 Citations: 3
Testing uniformity on the circle using spacings when data are rounded SR Jammalamadaka, K Ghosh, S Akiri Statistics & Probability Letters 210, 110114 , 2024 2024 Citations: 1
A detailed case study of an integrated redundant reliability model using the parallel-series configuration B Kapu, S Akiri, SRAO VELAMPUDI, P KUMAR, RS SUBBARA Journal of Theoretical and Applied Information Technology 102 (11) , 2024 2024 Citations: 2
Integrated Redundant Reliability Model using k out of n Configuration with Integer Programming Approach PKS Srinivasa Rao Velampudi, Sridhar Akiri Statistics and Applications 22 (01), 137-147 , 2024 2024 Citations: 4
Markov Model’s Probability Distributions for Study of SBI E-Card Transaction S Rekha, S Akiri, TR Padi, GF Dar International Journal of Statistics and Reliability Engineering 10 (2), 317-324 , 2023 2023
A Comprehensive Case Study on Integrated Redundant Reliability Model Using k-out-of-n Configuration SR Velampudi, S Akiri, PK Subbara, VSS Yadavalli Reliability: Theory & Applications 18 (1 (72)), 110-119 , 2023 2023 Citations: 7
Design and implementation of an integrated redundant reliability system for k out of n configuration SR Velampudi, S Akiri, KR Yenda NeuroQuantology 20 (19), 998 , 2022 2022 Citations: 2
k-out-of-n systems growth study focusing on redundant reliability systems by using heuristic programming approach SR Velampudi, S Akiri, PK Subbara Mathematical Statistician and Engineering Applications 71 (4), 5602-5613 , 2022 2022 Citations: 1
System Assurances: Modeling and Management P Johri, A Anand, J Vain, J Singh, MT Quasim Academic Press , 2022 2022 Citations: 13
MOST CITED SCHOLAR PUBLICATIONS
System Assurances: Modeling and Management P Johri, A Anand, J Vain, J Singh, MT Quasim Academic Press , 2022 2022 Citations: 13
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Systems Reliability Engineering: Modeling and Performance Improvement A Kumar, M Ram Walter de Gruyter GmbH & Co KG , 2021 2021 Citations: 5
Optimization of IRM Series-Parallel and Parallel-Series Redundant System PS Sasikala P, Sridhar Akiri Journal Critical Reviews 7 (17), 1801-1811 , 2020 2020 Citations: 5
Solution of Transportation Problem with South-East Corner Method, North-East Corner Method and Comparison with Existing Method S Sasikala OALib , 2019 2019 Citations: 5
Optimization of IRM Parallel-Series Redundant System P Sasikala, A Sridhar, S Pavankumar, C Umashankar International Journal of Engineering Research & Technology (IJERT) 2 (2) , 2013 2013 Citations: 5
Integrated Redundant Reliability Model using k out of n Configuration with Integer Programming Approach PKS Srinivasa Rao Velampudi, Sridhar Akiri Statistics and Applications 22 (01), 137-147 , 2024 2024 Citations: 4
Studies on the effect of nitrogen, phosphorous and potassium on growth and yield of guava (Psidium guajava L.) cultivars under meadow system of planting N Thirupathi, M Raj Kumar, A Kiran Kumar, D Sridhar, S Shiva Kumar Res Environ Life Sci 9 (2), 241-244 , 2016 2016 Citations: 4
Enhancing Reliability of Series-Parallel Systems: A Novel Mathematical Model for Redundancy Allocation BK Ramadevi Surapati, Sridhar Akiri, Srinivasa Rao Velampudi , Vasili B.V ... European Journal of Pure and Applied Mathematics 18 (01), 01-23 , 2025 2025 Citations: 3
A detailed case study of an integrated redundant reliability model using the parallel-series configuration B Kapu, S Akiri, SRAO VELAMPUDI, P KUMAR, RS SUBBARA Journal of Theoretical and Applied Information Technology 102 (11) , 2024 2024 Citations: 2
Design and implementation of an integrated redundant reliability system for k out of n configuration SR Velampudi, S Akiri, KR Yenda NeuroQuantology 20 (19), 998 , 2022 2022 Citations: 2
Design and evaluation of parallel-series IRM system S Akiri, P Sasikala, PK Subbara, VSS Yadavalli System Assurances, 189-208 , 2022 2022 Citations: 2
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Testing uniformity on the circle using spacings when data are rounded SR Jammalamadaka, K Ghosh, S Akiri Statistics & Probability Letters 210, 110114 , 2024 2024 Citations: 1
k-out-of-n systems growth study focusing on redundant reliability systems by using heuristic programming approach SR Velampudi, S Akiri, PK Subbara Mathematical Statistician and Engineering Applications 71 (4), 5602-5613 , 2022 2022 Citations: 1
Effects of solar eclipse on shortwave transmissions. EP Radhakrishnan, N Balan, AA Sridhar, K Usha Devi Proceedings of the Indian National Science Academy Part A 48, 325-333 , 1982 1982 Citations: 1
Design of a high resolution HF phased array for ionospheric applications at the equator N Balan, VN Nandakumar, S Chandrasekhar, KN Iyer, PB Rao, A Sridhar Indian Journal of Radio and Space Physics 8, 289-294 , 1979 1979 Citations: 1
An Integrated Redundant Reliability Optimization Framework for Coherent Hybrid Systems Using Lagrange Multiplier, Heuristic, And Integer Programming Approaches RS Sai Uma Sankar Mandavilli, Sidhar Akiri, Srinivasa Rao Velampudi, Arun ... Journal of Theoretical and Applied Information Technology 104 (07), 245-259 , 2026 2026
