As the disassembly of end-of-life products is affected by several dynamic and uncertain issues, many mathe-matical models and solution approaches have been established. However, with more extended objectives, constrai...
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As the disassembly of end-of-life products is affected by several dynamic and uncertain issues, many mathe-matical models and solution approaches have been established. However, with more extended objectives, constraints and different methods of disassembly, inconsistent models relating to product representations and types of disassembly lines have become the main barriers for the transfer of research to practise. In this paper, a systematic overview of recent models to summarise the input data, parameters, decision variables, constraints and objectives of disassembly line balancing are presented. After discussing the adaptation and extensibility of these models for different environments, a unified encoding scheme is designed to apply typical multi-objective evolutionary algorithms on this problem with extensive decision variables and seven significant objectives. algorithm comparison on four typical cases is then carried out based on seven commonly used products to verify the optimisation process for the integrated version of existing models and demonstrate the overall performance of the typical multi-objective evolutionary algorithms on this problem. Experimental results can be a baseline for further algorithm design and practical algorithm selection on these disassembly line balancing scenarios.
ROP (Rate of Penetration) is a comprehensive indicator of the rock drilling process and how efficiently predicting drilling rates is important to optimize resource allocation, reduce drilling costs and manage drilling...
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ROP (Rate of Penetration) is a comprehensive indicator of the rock drilling process and how efficiently predicting drilling rates is important to optimize resource allocation, reduce drilling costs and manage drilling hazards. However, the traditional model is difficult to consider the multiple factors, which makes the prediction accuracy difficult to meet the real drilling requirements. In order to provide efficient, accurate and comprehensive information for drilling operation decision-making, this study evaluated the applicability of four typical regression algorithms based on machine learning for predicting pore pressure in Troll West field, namely SVR (Support Vector Regression), Linear regression, Regression Tree and Gradient Boosting regression. These methods allow more parameters input. By comparing the prediction results of these typical regression algorithms based on R-2(R-Square), explained variance, mean absolute error, mean squared error, median absolute error and other performance indicators, it was found that each method predicted different results, among which Gradient Boosting regression has the best results, their prediction accuracy is high and the error is very low. The prediction accuracy of these methods is positively correlated with the proportion of the training data set. With the increase of logging features, the prediction accuracy is gradually improved. In the prediction of adjacent wells, the ROP prediction methods can achieve a certain prediction effect, which shows that this method is suitable for ROP prediction in Troll West field.
In this paper, based on the Rayleigh quotient and its generalized Rayleigh quotient, two treatments are developed to solve the complex eigenvalue problems, which arise from the analysis of the optical wave propagation...
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ISBN:
(纸本)0819455938
In this paper, based on the Rayleigh quotient and its generalized Rayleigh quotient, two treatments are developed to solve the complex eigenvalue problems, which arise from the analysis of the optical wave propagation in Stab waveguides with some perfectly matched layers. Numerical examples illustrate that these treatments are efficient and feasible, and the generalized Rayleigh quotient method is better than the Rayleigh quotient method for some eigenvalues with smaller norm.
Although data compression has been studied for over 30 years, many new techniques are still evolving. There is considerable software available that incorporates compression schemes and archiving techniques. The U. S. ...
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Although data compression has been studied for over 30 years, many new techniques are still evolving. There is considerable software available that incorporates compression schemes and archiving techniques. The U. S. Navy is interested in knowing the performance of this software. This thesis studies and compares the software. The testing files consist of the file types specified by the U. S. Naval Security Detachment at Pensacola, Florida.
The Capacitated Vehicle Routing Problem (CVRP) is an optimization problem that involves arranging vehicle routes while considering vehicle capacity. This research aims to compare the effectiveness of several heuristic...
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The Capacitated Vehicle Routing Problem (CVRP) is an optimization problem that involves arranging vehicle routes while considering vehicle capacity. This research aims to compare the effectiveness of several heuristic (Path Cheapest Arc, Path Most Constrained Arc, Savings, Christofides) and metaheuristic (Greedy Descent, Guided Local Search, Simulated Annealing, Tabu Search) algorithms for determining the routing scenarios and vehicle types for faculty transportation between the male campus in Ponorogo and the female campus in Mantingan Ngawi at Universitas Darussalam Gontor. The research involves decision variables for vehicle routing determination and the objective of minimizing the distance traveled. The constraint function includes two options: one vehicle with a capacity of 60 passengers and four vehicles. This research utilizes Google OR Tools with the Python programming language using Google Colab to facilitate the calculation process. The research results indicate that metaheuristic algorithms outperform heuristics for complex case studies (four vehicles). This study recommends using metaheuristic methods, specifically Christofides Guided Local Search and Christofides Simulated Annealing, for determining the best routes with the shortest distance and time. Further research was developed using algorithms such as hyperheuristics or matheuristics.
In recent years, meta-heuristic (MH) algorithms have emerged as powerful optimization tools, enabling efficient solutions to complex truss optimization tasks. In this study, a performance assessment of eight newly dev...
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In recent years, meta-heuristic (MH) algorithms have emerged as powerful optimization tools, enabling efficient solutions to complex truss optimization tasks. In this study, a performance assessment of eight newly developed MH algorithms is presented for the optimal design of large-scale truss structures. The algorithms selected for testing include the Manta-ray Foraging Optimization (MRFO), Artificial Gorilla Troops Optimizer (GTO), Equilibrium Optimizer (EO), Henry Gas Solubility Optimizer (HGSO), Aquila Optimizer (AO), Heap-based Optimizer (HBO), Snake Optimizer (SO), and Artificial Hummingbird algorithm (AHA). Collectively, the eight techniques cover recent advances in nature-inspired MH approaches and use diverse search mechanisms for their optimization procedure. To effectively compare the performance of the eight techniques, five large-scale truss benchmarks (including the 4666-bar truss tower) were employed as test beds. For statistical significance, the Friedman ranking test was used to quantitatively compare the performance of the eight techniques. The results of the comparison show HBO as the best-performing method by consistently providing the lightest truss designs with the least computational effort. Quantitatively, HBO produced structures that were (on average) 21% lighter than the other seven techniques. In contrast, both AO and HGSO suffered from poor results and slow convergence speeds. HGSO in particular emerged as the worst-performing method and was prone to falling into local optima. In light of this, recommendations for improving the optimization performance for the eight techniques were made within the article.
Mixture choice experiments investigate people's preferences for products composed of different ingredients. To ensure the quality of the experimental design, many researchers use Bayesian optimal design methods. E...
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Mixture choice experiments investigate people's preferences for products composed of different ingredients. To ensure the quality of the experimental design, many researchers use Bayesian optimal design methods. Efficient search algorithms are essential for obtaining such designs. Yet, research in the field of mixture choice experiments is not extensive. Our paper pioneers the use of a simulated annealing (SA) algorithm to construct Bayesian optimal designs for mixture choice experiments. Our SA algorithm not only accepts better solutions, but also has a certain probability of accepting inferior solutions. This approach effectively prevents rapid convergence, enabling broader exploration of the solution space. Although our SA algorithm may start more slowly than the widely used mixture coordinate-exchange method, it generally produces higher-quality mixture choice designs after a reasonable runtime. We demonstrate the superior performance of our SA algorithm through extensive computational experiments and a real-life example.
This study introduces a novel multi-objective optimization framework (DBNO) that integrates deep Bayesian networks with a hybrid algorithm combining random search and innovation diffusion to address high-dimensional p...
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This study introduces a novel multi-objective optimization framework (DBNO) that integrates deep Bayesian networks with a hybrid algorithm combining random search and innovation diffusion to address high-dimensional patent layout optimization challenges. The framework was developed in response to the increasing complexity of patent layout decisions, where traditional single-objective optimization methods prove inadequate for simultaneously addressing multiple conflicting objectives such as profit, risk, and sustainability. To evaluate the framework's effectiveness, we conducted comprehensive experiments comparing DBNO against established algorithms including genetic algorithm (GA), particle swarm optimization (PSO), and traditional Bayesian optimization methods. Performance metrics encompassed convergence speed, computational efficiency, optimization stability, and solution quality across multiple objectives. The results demonstrate that DBNO consistently outperforms benchmark algorithms, particularly in optimizing sustainability objectives. Notably, DBNO exhibited superior stability and higher success rates in the optimization process compared to GA and PSO, highlighting its robustness in handling complex high-dimensional optimization problems. Furthermore, the integration of innovation diffusion mechanisms significantly enhanced both the efficiency and accuracy of the optimization process. The primary contribution of this research lies in the novel combination of deep Bayesian networks with ensemble random search techniques, resulting in a powerful multi-objective optimization framework. This approach provides an effective solution for high-dimensional patent layout problems while offering new perspectives for patent strategic decision-making. The findings advance the field of multi-objective optimization and establish a foundation for future research in patent portfolio optimization.
In this study, we have compared manual machine learning with automated machine learning (AutoML) to see which performs better in predictive analysis. Using data from past football matches, we tested a range of algorit...
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In this study, we have compared manual machine learning with automated machine learning (AutoML) to see which performs better in predictive analysis. Using data from past football matches, we tested a range of algorithms to forecast game outcomes. By exploring the data, we discovered patterns and team correlations, then cleaned and prepped the data to ensure the models had the best possible inputs. Our findings show that AutoML, especially when using logistic regression can outperform manual methods in prediction accuracy. The big advantage of AutoML is that it automates the tricky parts, like data cleaning, feature selection, and tuning model parameters, saving time and effort compared to manual approaches, which require more expertise to achieve similar results. This research highlights how AutoML can make predictive analysis easier and more accurate, providing useful insights for many fields. Future work could explore using different data types and applying these techniques to other areas to show how adaptable and powerful machine learning can be.
Discrete choice experiments (DCEs) investigate the attributes that influence individuals' choices when selecting among various options. To enhance the quality of the estimated choice models, researchers opt for Ba...
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Discrete choice experiments (DCEs) investigate the attributes that influence individuals' choices when selecting among various options. To enhance the quality of the estimated choice models, researchers opt for Bayesian optimal designs that utilize existing information about the attributes' preferences. Given the nonlinear nature of choice models, the construction of an appropriate design requires efficient algorithms. Among these, the coordinate-exchange (CE) algorithm is commonly employed for constructing designs based on the MNL model. However, as a hill-climbing method, the CE algorithm tends to quickly converge to local optima, potentially limiting the quality of the resulting designs. We propose the use of a simulated annealing (SA) algorithm to construct Bayesian optimal designs. This algorithm accepts both superior and inferior solutions, avoiding premature convergence and allowing a more thorough exploration of potential solutions. Consequently, it ultimately obtains higher-quality choice designs compared to the CE algorithm. Our work represents the first application of an SA algorithm in constructing Bayesian optimal designs for DCEs. Through extensive computational experiments, we demonstrate that the SA designs generally outperform the CE designs in terms of statistical efficiency, especially when the prior preference information is highly uncertain.
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