Article
Engineering, Industrial
Hadi Gholinezhad
Summary: This paper proposes a new Reliability Redundancy Allocation Problem (RRAP) where non-identical components can be allocated to each subsystem and the redundancy strategy is variable. An improved genetic algorithm is presented to solve the proposed problem. The results demonstrate that the proposed RRAP outperforms the previous models in terms of reliability improvement.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2024)
Article
Management
Mohammad Reihaneh, Mostafa Abouei Ardakan, Majid Eskandarpour
Summary: This study proposes an exact algorithm to solve the RAP problem with heterogeneous components under a mixed redundancy strategy, representing the first application of the branch-and-price algorithm in the literature of reliability optimization problems. The algorithm can also handle other variants of RAP and evaluate the advantages of the mixed strategy over others.
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
(2022)
Article
Engineering, Industrial
Hanxiao Zhang, Muxia Sun, Yan-Fu Li
Summary: This paper studies the reliability-redundancy allocation problem in multi-state flow networks, considering the minimization of cost or the maximization of reliability under resource constraints. An approximation scheme based on minimal cut is proposed to transform the problem, and feasibility guarantee and posterior check are conducted to ensure the quality of the solution. Numerical experiments show the tradeoff between accuracy and computational complexity, and the outperformance of the proposed method compared to a meta-heuristic algorithm.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Article
Engineering, Industrial
Jinchun Zhang, Hang Lv, Jinxiu Hou
Summary: A novel general reliability model optimization model based on mixed redundancy strategy is proposed for k-out-of-n:G subsystems. The system reliability function is established using continuous-time Markov chain, and a pseudo-parallel genetic algorithm is designed for redundancy allocation problem optimization. Numerical analysis and comparison experiments show that the proposed model can provide higher reliability.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2023)
Article
Engineering, Industrial
Tsung-Jung Hsieh
Summary: This study introduces a new model to enhance system reliability, utilizing a hybrid artificial bee colony algorithm and simplified swarm optimization search method. Experimental results show that the proposed method not only reduces costs, but also significantly improves the utilization of weight, volume, and computing time.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2021)
Article
Engineering, Industrial
Elnaz Golmohammadi, Mostafa Abouei Ardakan
Summary: This study presents a new reliability model to address the degradation issue of standby components due to harsh environmental conditions. The model adopts a periodic inspection and preventive maintenance policy to maximize system reliability.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Article
Engineering, Industrial
Abdossaber Peiravi, Mustapha Nourelfath, Masoumeh Kazemi Zanjani
Summary: This paper proposes a new universal redundancy strategy that allows for changing system structure at any time for improved system reliability. The strategy offers a wide range of possibilities by selecting the optimal reconfiguration instant and number of components.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Article
Computer Science, Interdisciplinary Applications
Negar Hossein Zavieh, Mostafa Abouei Ardakan, Hamed Davari-Ardakani
Summary: This paper revisits the reliability-redundancy allocation problem and introduces the K-mixed redundancy strategy to solve test problems in complex system design. The results show that the new strategy outperforms both the conventional active and standby strategies, as well as its mixed strategy counterpart, while providing more reliable structures. Moreover, the K-mixed strategy is proven to be superior for systems with low reliability switching mechanisms.
JOURNAL OF STATISTICAL COMPUTATION AND SIMULATION
(2022)
Article
Engineering, Multidisciplinary
Tsung-Jung Hsieh
Summary: A new strategic model called RRAP-CM-MCCS is proposed in the study, utilizing simplified swarm optimization (SSO) to improve system reliability through a multi-role resource sharing strategy and save resources.
ENGINEERING OPTIMIZATION
(2022)
Article
Engineering, Industrial
Niloofar Sedaghat, Mostafa Abouei Ardakan
Summary: This paper introduces a new unified redundancy strategy called G-mixed, which improves system reliability by changing the activation time of redundant components, and in most cases outperforms previously reported strategies.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2021)
Article
Computer Science, Interdisciplinary Applications
Narges Mahdavi-Nasab, Mostafa Abouei Ardakan, Abdossaber Peiravi
Summary: This paper revisits the reliability-redundancy allocation problem with the mixed redundancy strategy and proposes a new model that can accurately estimate reliability values and optimize the calculation process. The model is based on a continuous-time Markov chain model and is solved using the water cycle algorithm. The computational results demonstrate the robustness and superiority of this new model in calculating reliability values and finding good results.
JOURNAL OF STATISTICAL COMPUTATION AND SIMULATION
(2022)
Article
Engineering, Industrial
Zixuan Zhang, Lin Yang, Youwei Xu, Ran Zhu, Yining Cao
Summary: This paper proposes a novel approach for the Reliability Redundancy Allocation Problem (RRAP) in complex systems. The complex system structure is modeled with a graph, and the system reliability is calculated using a functionality multi-graph. The proposed method is validated through comparative experiments and a case study of security system design.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2023)
Article
Computer Science, Interdisciplinary Applications
Ali Najmi, Mostafa Abouei Ardakan, Youness Javid
Summary: The traditional assumptions of using homogeneous components and predetermined redundancy strategies for each subsystem in the reliability-redundancy allocation problem (RRAP) are relaxed in this article, leading to a more realistic problem with heterogeneous components and optimal strategies for each subsystem. Standby subsystem reliability is calculated using an exact Markov model. Results from testing on three benchmark problems show the advantages of the new RRAP model over previous studies.
JOURNAL OF STATISTICAL COMPUTATION AND SIMULATION
(2021)
Article
Computer Science, Interdisciplinary Applications
Vicky Mak-Hau, Brendan Hill, David Kirszenblat, Bill Moran, Vivian Nguyen, Ana Novak
Summary: This paper addresses a unique combinatorial optimization problem derived from helicopter aircrew training for the Royal Australian Navy. The main objective is to find optimal course scheduling solutions and minimize the total time required to complete the syllabus.
COMPUTERS & INDUSTRIAL ENGINEERING
(2021)
Article
Engineering, Industrial
Rahul Nath, Pranab K. Muhuri
Summary: This paper presents a novel study of the reliability redundancy allocation problem (RRAP) as a many objective optimization problem, where a new procedure based on NSGA-III is proposed for solving MaORRAP. The performances of NSGA-III and other popular evolutionary algorithms in solving MaORRAP are compared and it is shown that NSGA-III based solutions are superior in most cases.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Article
Computer Science, Hardware & Architecture
Saeide Sheikhpour, Ali Mahani, Nasour Bagheri
IET COMPUTERS AND DIGITAL TECHNIQUES
(2019)
Article
Engineering, Electrical & Electronic
Saeide Sheikhpour, Ali Mahani, Nasour Bagheri
IET CIRCUITS DEVICES & SYSTEMS
(2019)
Article
Computer Science, Artificial Intelligence
Amin Kargar-Barzi, Ali Mahani
JOURNAL OF AMBIENT INTELLIGENCE AND HUMANIZED COMPUTING
(2020)
Article
Computer Science, Hardware & Architecture
Saeideh Sheikhpour, Ali Mahani, Nasour Bagheri
Summary: This paper presents two novel online fault-tolerant schemes for the Advanced Encryption Standard (AES) to improve the reliability of cryptographic hardware. These fault-tolerant schemes are based on a combination of hardware and time redundancies, proposing new redundancy strategies for the AES round function and key expansion unit.
MICROPROCESSORS AND MICROSYSTEMS
(2021)
Article
Computer Science, Hardware & Architecture
Saeideh Sheikhpur, Mahdi Taheri, Mohammad Saeed Ansari, Ali Mahani
Summary: A low-cost fault resilient architecture for AES is proposed to ensure reliability, security, and privacy in communication. Through the introduction of a novel voting scheme and the development of a reliable and secure 32-bit data-path AES implementation, the architecture achieves fault tolerance for multiple-bit faults.
IET COMPUTERS AND DIGITAL TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Saeideh Sheikhpour, Mohammad Hassani Sadi, Ali Mahani
Summary: This paper discusses the importance of using the SIMON encryption algorithm to enhance the security of IoT applications and proposes an optimized architecture for hardware platforms. The architecture has multiple operating modes, suitable for different application scenarios that require varying levels of security.
MICROELECTRONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Saeideh Sheikhpour, Seok-Bum Ko, Ali Mahani
Summary: The Internet of Things plays a crucial role in various domains, but its security remains a challenge. To address security concerns, this paper proposes a 32-bit architecture AES encryption/decryption scheme and a fault-resilient integrated architecture named LC-FRAES to ensure communication reliability and security.
MICROELECTRONICS RELIABILITY
(2021)
Proceedings Paper
Computer Science, Hardware & Architecture
Mahdi Taheri, Saeideh Sheikhpour, Ali Mahani, Maksim Jenihhin
Summary: We propose a novel logic style with self-checking capability to enhance hardware reliability at the logic level. The logic cells introduced have two-rail inputs/outputs and enable the construction of fault-tolerant configurable circuits. Simulation results using HSPICE demonstrate that the case-study circuit utilizing the proposed gates outperforms other error-detection implementations in terms of speed and power consumption.
2022 IEEE 28TH INTERNATIONAL SYMPOSIUM ON ON-LINE TESTING AND ROBUST SYSTEM DESIGN (IOLTS 2022)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Mandieh Azizollahi, Saeideh Sheikhpour, Ali Mahani
2020 28TH IRANIAN CONFERENCE ON ELECTRICAL ENGINEERING (ICEE)
(2020)
Article
Computer Science, Artificial Intelligence
Ali Mahani, Ebrahim Farahmand, Saeide Sheikhpour, Nooshin Taheri-Chatrudi
INTERNATIONAL JOURNAL OF COMPUTATIONAL INTELLIGENCE AND APPLICATIONS
(2020)
Article
Telecommunications
Amin Kargar-Barzi, Ali Mahani
IET WIRELESS SENSOR SYSTEMS
(2020)
Article
Automation & Control Systems
Saeide Sheikhpour, Ali Mahani, Nasour Bagheri
JOURNAL OF CONTROL AUTOMATION AND ELECTRICAL SYSTEMS
(2019)
Article
Computer Science, Artificial Intelligence
Saeide Sheikhpour, Ali Mahani
INTERNATIONAL JOURNAL OF COMPUTATIONAL INTELLIGENCE AND APPLICATIONS
(2017)