Abstract:The process of personnel selection is a crucial concern for any business entity engaged in economic pursuits in contemporary times. The significance of employee selection cannot be overstated, as it is a pivotal determinant of organizational success. When an organization identifies a suitable candidate for a position and chooses to engage in recruitment, it can represent a crucial juncture for the company and have significant implications for its operations. This study employs the trapezoidal interval type-2 (IT2) fuzzy DEMATEL-Analytic Network Process method to carry out personnel selection. Furthermore, the significance values of the primary and secondary criteria pertaining to the recruitment of personnel were established. The utilization of square comparison matrices is a prerequisite for the implementation of the DEMATEL-ANP methodology. The quantity of subcriteria for this particular application is equivalent to that of the alternative. This facilitated the implementation of the strategy without encountering any challenges. The goal of this study is to examine the feasibility of utilizing IT2 FSs for the purpose of effectively managing uncertainty. Furthermore, the execution of sensitivity analysis is crucial for multiple criteria decision making (MCDM) methodologies.
Abstract:This paper presents the ovalization growth and critical ovalization of 6061-T6 aluminum alloy round-hole tubes (6061-RHTs) with different hole diameters of 2, 4, 6, 8, and 10 mm and different hole direction of 0, 30, 60, and 90 submitted to cyclic bending. It can be observed that the cross-section of the 6061-RHT continues to ovalize to a critical value before breaking. A larger controlled curvature or hole diameter leads to a greater ovalization. However, a larger hole direction leads to a smaller ovalization. In addition, the relationship between the ovalization at negative extreme curvature and number of cycles can be divided into three stages (stages I, II and III). It can be seen that most of the number of cycles are in stages I and II. Finally, the empirical formula introduced by Lee et al. in 2010 was employed and material parameters related to the hole diameter and hole direction were proposed for simulating the above-mentioned relationships in stages I and II. In addition, an empirical formula was also proposed to simulate the critical ovalization-controlled curvature relationships. It was found that the experimental and simulated data agreed quite well.
Abstract:Let G = (V, E) be a properly colored graph with c : V (G) → {1, 2...χ(G)}. A\ncolor induced signed graph S_c is obtained from G and is defined by assigning the\nsignature function for every edge uv in G as positive if c(u) and c(v) are both odd\nor even and negative otherwise. The chromatic rna number is the smallest number of negative edges in all such color induced signed graphs of G. In this paper, we\ninvestigate the chromatic rna number of some graphs under the operations corona\nand cartesian product of two graphs
Abstract:The monitoring and diagnosis of damage in dynamic machines is an area of growing interest in the cement industry. Indeed, industrial equipment is disturbed throughout its operation by malfunctions, especially in old age, which affect its operating costs and availability. Therefore, the detection and identification of faults in industrial systems - diagnosis - is of paramount importance for their operation and a major challenge for modern industry. Among the most popular techniques used in diagnostics is spectral analysis, a tool for condition monitoring, which is used to study the vibration signals of dynamic machines.\nIn this context, the objective of this work is the early detection of failures by frequency spectral analysis, which is based on an analysis of the vibration signal in order to search for the presence of vibratory images of all the defects likely to affect the installation considered. As a case study, we took the ball mill of the Hamma Bouziane-Constantine cement plant, given its importance in the production process. To do so, a knowledge of the kinematic characteristics of the various constituent parts and their excitation frequencies is required. Our choice is justified by its use in the elaboration of the choice of the conditional maintenance strategy for industrial applications.
Abstract:The world wide use of the public internet has opened up the possibility of applying similar technology for automated functioning of physical objects equipped with micro electronic devices. The perception is to apply that kind of technology to various areas of human activity for enhancing the quality and scale of performance. Starting from automated homes, the possibility of application are projected to be in efficient transport systems, energy management, smart cities, industrial automation, environmental monitoring, business management, defense operations etc. Such activities require huge network support, deployed over vast areas of the globe with suitable taxonomy for fast connectivity and operation. In this paper, it is suggested that the network is hierarchical having hybrid tree graph architecture, with the root node as the overall controlling headquarter. The hierarchy of the nodal stations is assumed to be based on the geographical distance from the root node, in which the nodes having the same hierarchy are also linked by collateral bus connectivity. The search of a node and routing data to the destination is carried out along a path which is as close as possible along the geographical direction of the location of that destination. Such a procedure was earlier developed by this author [19], [20], accounting fully for the sphericity of the globe. Accordingly, an algorithm for the search and routing in the envisaged network is presented in conclusion.
Abstract:Due to the exponential growth in the number of web users, there\'s been a great advancement in the development of fiber-wireless (Fi-Wi) networks during the last few decades. Fi-Wi systems are now proven to be a great component in the sphere of the internet and communication due to their superiority over other technologies. Fi-Wi technology gives a large quantity of bandwidth and consistency to network users in a participatory way which means the network provides \"Anywhere Anytime\" connectivity service to consumers at a great speed. However, the higher energy consumption of Sensor Network causes limited network lifespan and hence affects the transmission. Over the years, a significant number of Media Access Control (MAC) approaches have been proposed by various researchers to effectively handle energy and transmission issues. Nevertheless, these methods faced issues like delays, less throughput caused by collisions, overheating, or some other reasons. In this paper, a hybridized method based on Carrier Sense Multiple Access (CSMA) and Time Division Multiple Access (TDMA) is proposed to mitigate above-mentioned issues. The main objective of the proposed work is to reduce the delays and increase the throughput in Fi-Wi networks. For this, the data is transmitted from the sender’s end, in bit form that is later modulated by the orthogonal frequency-division multiplexing (OFDM) modulator. These modulated signals are then transmitted over the free-space optical communication (FSO) channel, where delay is calculated. At the receiving station, the optical signal is received and detected by the photo detector which demodulates the optical signal through the OFDM demodulation. Finally, the performance of the received signal is analyzed in the Opti-system. The results obtained show the proposed MAC protocol is outperforming the traditional MAC protocols in terms of its throughput, transmission efficiency, and delay.
Abstract:In the present study, a parallel system is analyzed by using the preventive maintenance with the inspection policy for failed component. A single server investigates the failed component is repairable or replaced by new one. The random variable of each task is statistically independent, and their rates are arbitrary distributed. Semi-Markov epoch and regenerative-point-technique are applied to formulate the expressions of associated reliability measures. For comparing the behavior of MTSF, availability function and profit function for different repair activities, graphs are drawn assuming the exponential distribution for rate of all repair activities.
Abstract:This article presents experimental and theoretical studies on the response of 6061-T6 aluminum alloy round-hole tubes (Al-RHTs) with five different hole sizes of 2, 4, 6, 8, and 10 mm and with five different hole directions of 0, 45o, 90, 135, and 180 submitted to pure bending creep. Pure bending creep is defined as bending the tube to the required moment and maintaining that moment for a period of time. It can be seen from experimental results that the curvature increases with time. In addition, larger holding moment or hole size results in larger creep curvature. As the curvature continues to increase, the round-hole tube eventually breaks. Finally, the empirical formula proposed by of Pan et al. in 2014 was improved to simulate the creep curvature-time relationship for pure bending creep in the initial and the secondary stages. After comparing with the experimental results, it is found that theoretical analysis can reproduce the experimental results reasonably.
Abstract:The warehouse is a fundamental element of logistics, which needs efficient ways to classify and assign a storage place. The storage location assignment problem (SLAP) can be treated as a multicriteria problem through decision-making methods that establish the classification of stock-keeping units (SKUs) influenced by the decision maker\'s opinion. This article aims to apply the value-focused thinking (VFT) and ELECTRE-MOr methods to support the strategic decision-making (DM) process in the classification of inventory units through multiple criteria, in a warehouse of a distribution company. The results found showed that, among 100 SKUs, 8% were allocated in the highest priority class A, 19% in the intermediate priority class B, and 73% of the SKUs, the great majority, were assigned to the lesser class.
Abstract:Processes that establish Compliance at first do not seem to add to the value chain of companies. However, the need to address legislation or issues related to corporate governance, social management, and the environment, lead large corporations to adopt such processes. This article aimed to establish a plan for prioritizing the implementation of compliance processes in a utilities company, through the meth-od of structuring Value-Focused Thinking (VFT) problems, and the application of the new hybrid multicriteria method SAPEVO-WASPAS-2N, derived from the unprecedented junction of SAPEVO-M (Simple Aggregation of Preferences Expressed by Ordinal Vectors – Multi Decision Makers) methods and WASPAS-2N (Weighted Aggregated Sum Product Assessment) with two standardization techniques. The application of the hybrid model SAPEVO-WASPAS-2N proved to be consistent and robust, generating two possibilities of ordering priorities aligned with the strategic situation of the organization based on the criteria established through the opinion of the decision makers.