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List of Articles
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Open Access Article
1 - Analyze the Effect of the Maintenance Activities on the Internet Sustainability by Using 2k Factorial Experiment Design
Ali KarevanNowadays, the internet and social networks become more popular than ever. People in all ages use the internet and communicate by that. One of the most terrible events in our daily life is to disconnect from the internet and lose the connections. It may also influence on MoreNowadays, the internet and social networks become more popular than ever. People in all ages use the internet and communicate by that. One of the most terrible events in our daily life is to disconnect from the internet and lose the connections. It may also influence on the economics; so the sustainability in this area is necessary. Internet service provider companies are the executors of selling and maintaining the internet bandwidth. Some activities perform to maintain the corrupted internet ports. In this paper, the effect of maintenance activities on the internet sustainability is analyzed. This paper also discusses the three important maintenance activities and compares each of them with two different methods. The aim of this paper is to illustrate whether these three factors effect on the internet sustainability or not. 2k design procedure was used to analyze the results. Manuscript profile -
Open Access Article
2 - A Heuristic Approach for Optimization of Gearbox Dimension
Mehrdad Hosseiniasl Javad Jafari FesharakiA powerful optimization method is proposed in this study for the minimal dimensional designproblem of gearbox. It is a general model that is suitable to use for any series of gear drives systemand can extract both dimensional and layout of components-limited optimizatio MoreA powerful optimization method is proposed in this study for the minimal dimensional designproblem of gearbox. It is a general model that is suitable to use for any series of gear drives systemand can extract both dimensional and layout of components-limited optimization design together.The objective function in this study has many local extremes so for avoiding this situation, variousconstraints have been determined Then, Particle swarm optimization algorithm has beenimplemented to speed up the convergence of optimization and elitist particles searched in problemspace to find optimum value of goal function until all of them converge to the similar set of values.At the end, Results have been presented in the utilitarian diagrams to obtain optimal parametersfrom useful diagrams. The results display that the proposed method in this study is better than otherreported in last works and it shows optimum volume of gearbox being related to a decrease of notjust space but costs, material used to make gearbox component, etc. Manuscript profile -
Open Access Article
3 - An Alternative Stability Proof for Direct Adaptive Function Approximation Techniques Based Control of Robot Manipulators
Payam KheirkhahanThis short note points out an improvement on the robust stability analysis for electrically drivenrobots given in the paper. In the paper, the author presents a FAT-based direct adaptive controlscheme for electrically driven robots in presence of nonlinearities associat MoreThis short note points out an improvement on the robust stability analysis for electrically drivenrobots given in the paper. In the paper, the author presents a FAT-based direct adaptive controlscheme for electrically driven robots in presence of nonlinearities associated with actuator inputconstraints. However, he offers not suitable stability analysis for the closed-loop system. In otherwords, it does not consider the role of saturation function in both control design and stabilityanalysis. Manuscript profile -
Open Access Article
4 - The Effectiveness of Ceramic Wiper Tool in Turning of Monel K500
Mohammad Lotfi Saeid Amini Sayed Ali Sajjady Adil Hussein JuaiferIn this study, turning operation of Monel K500 copper-nickel super-alloy was evaluated. Ceramic cutting tools with two different cutting noses (conventional and wiper) were utilized. At first, the experimental tests were designed by using central composite design method MoreIn this study, turning operation of Monel K500 copper-nickel super-alloy was evaluated. Ceramic cutting tools with two different cutting noses (conventional and wiper) were utilized. At first, the experimental tests were designed by using central composite design method. After implementation of the tests, the statistical models for output data (surface roughness, cutting force, and flank wear) have been developed. Furthermore, the effect of cutting parameters on output data was taken into account with help of analysis of variance. In third step, the optimal cutting condition was introduced for both cutting tools by using response surface method. In total, it was revealed that low depth of cut and feed rate coupled with high cutting speed is an optimal condition for turning of Monel super-alloy when ceramic tools are selected. In particular, the positive effect of wiper tool on output data was more when depth of cut has been lower than the length of wiper edge. Manuscript profile -
Open Access Article
5 - Solving Re-entrant No-wait Flexible Flowshop Scheduling Problem; Using the Bottleneck-based Heuristic and Genetic Algorithm
Sara Habibi Shahin Ordikhani Ahmad Reza HaghighiIn this paper, we study the re-entrant no-wait flexible flowshop scheduling problem with makespan minimization objective and then consider two parallel machines for each stage. The main characteristic of a re-entrant environment is that at least one job is likely to vis MoreIn this paper, we study the re-entrant no-wait flexible flowshop scheduling problem with makespan minimization objective and then consider two parallel machines for each stage. The main characteristic of a re-entrant environment is that at least one job is likely to visit certain stages more than once during the process. The no-wait property describes a situation in which every job has its own processing sequence with the constraint that no waiting time is allowed among operations within any jobs. This study develops a bottleneck-based heuristic (BBFFL) to solve a flexible flowshop problem including a bottleneck stage. Also, a genetic algorithm (GA) based on heuristics for the problem is presented. First, the mathematical model for the problem is proposed, and then the suggested algorithms are explained. For small-scale, the results of the BBFFL and GA are compared to the results derived from the GAMS. For large-scale problems, the results of the GA and BBFFL are compared with each other. For small-scale problems, the algorithms have a close performance but the BBFFL is likely to generate much better in finding solutions in large-scale problems. Manuscript profile -
Open Access Article
6 - Extracting Manufacturing Process Map in the Form of the IDEF Model Prerequisite for the Implementation of PFMEA in the Sugar Industry
Mohammad Baghbani Soleyman Iranzadeh Majid Bagherzadeh KhajehThe purpose of this research is to demonstrate the importance of extracting business process mappings as a prerequisite for the implementation of the PFMEA (Process Failure Mode and Effect Analysis). In the first stage, 30 production process failures were extracted in t MoreThe purpose of this research is to demonstrate the importance of extracting business process mappings as a prerequisite for the implementation of the PFMEA (Process Failure Mode and Effect Analysis). In the first stage, 30 production process failures were extracted in the meetings with factory managers. Then, a team was formed by the presence of process owners, and with the help of the project team, the production process map was drawn up according to the IDEF0 standard. In the next step, for the second time, potential failures were extracted according to the production process map. This time, 49 failures in the production process with the potential sources of failures were identified. The results of the study showed that by extraction of the production process map, more failures in the production process would be detectable. In fact, extraction of the process map is a prerequisite for the implementation of the PFMEA. In this research, in order to better describe the steps taken, all extracted processes are schematically illustrated in accordance with the IDEF0 Modeling Standard, so that other sugar-producing companies can also use them to implement the PFMEA. The innovative aspect of this research is to extract the production process failures before and after extracting the process map and compare them with each other. Manuscript profile
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