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Solving a Typical Small Sample Size MRSM Dataset Problem Using a Flexible Hybrid Ensemble Approach for Credibility 使用灵活的混合集合方法解决典型的小样本量 MRSM 数据集问题,提高可信度
Pub Date : 2024-01-05 DOI: 10.19139/soic-2310-5070-1111
D. Chikobvu, Domingo Pavolo
Multiresponse surface methodology often involves small data analytics which, statistically, have regression modelling credibility problems. This is worsened by dataset, model selection and solution methodology uncertainties. It is difficult for solution methodologies which select and use single best models per response at simultaneous optimisation to effectively deal with these problems. This paper exploited the fact that model selection criteria choose differently, in a flexible hybrid ensemble system, to generate several solutions for integration and comparison. Mean square prediction error, with bias-variance-covariance decomposition values, was computed and analysed at simultaneous optimisation. Results suggest that the credibility of the final solution is enhanced when working with multiple models, solution methodologies and results. However, the results do not show any significance of small sample size correction to model selection criteria and analysis of bias-variance-covariance decompositions at simultaneous optimisation does not encourage dependence on theoretical optimality for best results.
多反应表面方法通常涉及小数据分析,从统计学角度看,存在回归模型可信度问题。数据集、模型选择和求解方法的不确定性使问题更加严重。在同步优化过程中,为每个响应选择和使用单一最佳模型的求解方法很难有效应对这些问题。本文利用模型选择标准选择不同的事实,在一个灵活的混合集合系统中,生成多个解决方案进行整合和比较。在同步优化过程中,计算并分析了带有偏差-方差-协方差分解值的均方预测误差。结果表明,在使用多种模型、解决方法和结果时,最终解决方案的可信度会得到提高。然而,结果并未显示小样本量校正对模型选择标准的任何意义,而且在同步优化时对偏差-方差-协方差分解的分析并不鼓励依赖理论最优性来获得最佳结果。
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引用次数: 0
Unemployment Rates in Vocational Education in Indonesia Using Economic and Statistical Analysis 利用经济和统计分析印尼职业教育的失业率
Pub Date : 2024-01-05 DOI: 10.19139/soic-2310-5070-1887
Suryadi, M. Romadona, Sigit Setiawan, Fachrizal, Andi Budiansyah, Syahrizal Maulana, Rahmi Lestari Helmi, Silmi Tsurayya, RY Kun Haribowo, Yuni Andari, Bagaskara, Ratna Sri Harjanti
The linear regression model is used in this research to study the influence of the independent variable on the dependent variable. The dependent variable Y is the unemployment rate in vocational education, while the independent variables are X1 in the form of Job Opportunities, X2 in the form of Policy and X3 in the form of Area. To estimate model parameters, the Ordinary Least Square method is used. The research results show that the three independent variables have a significant effect on the dependent variable. Variable X1 has a significant positive effect on the unemployment rate, variables X2 and X3 have a significant negative effect on the unemployment rate in vocational higher education in Indonesia. From the results of this research, there has been an oversupply of labor in vocational higher education in Indonesia.
本研究采用线性回归模型来研究自变量对因变量的影响。因变量 Y 为职业教育失业率,自变量 X1 为就业机会,X2 为政策,X3 为地区。模型参数估计采用普通最小二乘法。研究结果表明,三个自变量对因变量有显著影响。变量 X1 对失业率有明显的正向影响,变量 X2 和 X3 对印尼高等职业教育的失业率有明显的负向影响。从研究结果来看,印尼高等职业教育存在劳动力供过于求的现象。
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引用次数: 0
Risk assessment in cryptocurrency portfolios: a composite hidden Markov factor analysis framework 加密货币投资组合的风险评估:复合隐马尔科夫因子分析框架
Pub Date : 2024-01-05 DOI: 10.19139/soic-2310-5070-1837
Mohamed Saidane
In this paper, we deal with the estimation of two widely used risk measures such as Value-at-Risk (VaR) and Expected Shortfall (ES) in a cryptocurrency context. To face the presence of regime switching in the cryptocurrency volatilities and the dynamic interconnection between them, we propose a Monte Carlo-based approach using heteroskedastic factor analysis and hidden Markov models (HMM) combined with a structured variational Expectation-Maximization (EM) learning approach. This composite approach allows the construction of a diversified portfolio and determines an optimal allocation strategy making it possible to minimize the conditional risk of the portfolio and maximize the return. The out-of-sample prediction experiments show that the composite factorial HMM approach performs better, in terms of prediction accuracy, than some other baseline methods presented in the literature. Moreover, our results show that the proposed methodology provides the best performing crypto-asset allocation strategies and it is also clearly superior to the existing methods in VaR and ES predictions.
在本文中,我们讨论了在加密货币背景下对风险价值(VaR)和预期缺口(ES)这两种广泛使用的风险度量的估算。面对加密货币波动率中存在的制度转换以及它们之间的动态相互联系,我们提出了一种基于蒙特卡罗的方法,使用异方差因子分析和隐马尔可夫模型(HMM),并结合结构化变异期望最大化(EM)学习方法。这种复合方法可以构建多样化的投资组合,并确定最佳分配策略,从而使投资组合的条件风险最小化,收益最大化。样本外预测实验表明,复合因子 HMM 方法在预测准确性方面优于文献中介绍的其他一些基准方法。此外,我们的结果表明,所提出的方法提供了性能最佳的加密资产配置策略,而且在 VaR 和 ES 预测方面也明显优于现有方法。
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引用次数: 0
Hyperspectral image restoration based on color superpixel segmentation 基于彩色超像素分割的高光谱图像复原
Pub Date : 2023-12-27 DOI: 10.19139/soic-2310-5070-1912
Huiying Huang, Shaoting Peng, Gaohang Yu, Jinhong Huang, Wenyu Hu
Hyperspectral images (HSI) are often degraded by various types of noise during the acquisition process, such as Gaussian noise, impulse noise, dead lines and stripes, etc. Recently, there exists a growing attenrion on low-rank matrix/tensor-based methods for HSI data restoration, assuming that the overall data is low-rank. However, the assumption of overall low-rankness often proves inaccurate due to the spatially heterogeneous local similarity characteristics of HSI. Traditional cube-based methods involve dividing the HSI into fixed-size cubes. However, using fixed-size cubes does not provide flexible coverage of locally similar regions at varying scales. Inspired by superpixel segmentation, this paper proposes the Shrink Low-rank Super-tensor (SLRST) approach for HSI recovery. Instead of using fixed-size cubes, SLRST employs a size-adaptive super-tensor. The proposed approach is effectively solved using the Alternating Direction Method of Multipliers (ADMM). Numerical experiments on HSI data verify that the proposed method outperforms other competing methods.
高光谱图像(HSI)在采集过程中经常会受到各种噪声的影响,如高斯噪声、脉冲噪声、死线和条纹等。最近,基于低秩矩阵/张量的 HSI 数据修复方法受到越来越多的关注,这种方法假定整体数据是低秩的。然而,由于 HSI 在空间上具有异质性的局部相似性特征,整体低秩的假设往往被证明是不准确的。传统的基于立方体的方法是将 HSI 分成固定大小的立方体。然而,使用固定大小的立方体无法灵活覆盖不同尺度的局部相似区域。受超像素分割的启发,本文提出了缩减低秩超张量(SLRST)方法来恢复 HSI。SLRST 不使用固定大小的立方体,而是采用大小自适应的超级张量。使用交替方向乘法(ADMM)可以有效地解决所提出的方法。对恒星仪数据的数值实验验证了所提出的方法优于其他竞争方法。
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引用次数: 0
Failure rate, vitality, and residual lifetime measures: Characterizations based on stress-strength bivariate model with application to an automated life test data 失效率、活力和剩余寿命测量:基于应力-强度双变量模型的特征描述,并应用于自动寿命测试数据
Pub Date : 2023-11-17 DOI: 10.19139/soic-2310-5070-1321
M. Eliwa, Abhishek Tyagi, Morad Alizadeh, M. El-Morshedy
In this article, we introduce some reliability concepts for the bivariate Pareto Type II distribution including joint hazard rate function, CDF for parallel and series systems, joint mean residual lifetime, and joint vitality function. The maximum likelihood and Bayesian estimation methods are utilized to estimate the model parameters. Simulation is carried out to assess the performance of the maximum likelihood and Bayesian estimators, and it is found that the two approaches work quite well in estimation process. Finally, a real lifetime data is analyzed to show the flexibility and the importance of the introduced bivariate mode.
本文介绍了双变量帕累托 II 型分布的一些可靠性概念,包括联合危险率函数、并联和串联系统的 CDF、联合平均残余寿命和联合活力函数。利用最大似然法和贝叶斯估计法来估计模型参数。通过模拟来评估最大似然估计法和贝叶斯估计法的性能,发现这两种方法在估计过程中效果相当好。最后,对一个真实的生命周期数据进行了分析,以显示所引入的双变量模式的灵活性和重要性。
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引用次数: 0
Implementation of Fuzzy Logic Controller Algorithms with MF optimization on FPGA 在 FPGA 上利用 MF 优化实现模糊逻辑控制器算法
Pub Date : 2023-11-13 DOI: 10.19139/soic-2310-5070-1790
Samet Ahmed, Kourd Yahia
In this work, we propose the design and implementation of a parallel-structured fuzzy logic controller with integral action and anti-windup. The Grey Wolf Optimization (GWO) optimization technique is used to optimize fuzzy rules, which allows for the complicated algebraic ideas of type 1 fuzzy logic algorithms to be reduced to straightforward numerical equations for FPGA target implementation. The techniques for operating a geared DC motor are optimized by the membership function structure of our controller's data propagation. Our proposed controller was implemented in Xilinx System Generator (XSG) and co-simulated on hardware and software with VIVADO and XSG tools.
在这项研究中,我们提出了一种具有积分作用和防倒转功能的并行结构模糊逻辑控制器的设计和实现方法。我们采用灰狼优化(GWO)技术来优化模糊规则,从而将第一类模糊逻辑算法的复杂代数思想简化为直接的数字方程,以便于 FPGA 目标实现。我们控制器的数据传播成员函数结构优化了齿轮直流电机的操作技术。我们提出的控制器是在赛灵思系统生成器 (XSG) 中实现的,并使用 VIVADO 和 XSG 工具在硬件和软件上进行了联合仿真。
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引用次数: 0
Statistical Analysis of Covid-19 Data using the Odd Log Logistic Kumaraswamy Distribution 使用奇数逻辑库马拉斯瓦米分布对 Covid-19 数据进行统计分析
Pub Date : 2023-11-13 DOI: 10.19139/soic-2310-5070-1572
F. Opone, Kadir Karakaya, Ngozi O. Ubaka
This paper presents a statistical analysis of Covid-19 data using the Odd log logistic kumaraswamy Kumaraswamy (OLLK) distribution. Some mathematical properties of the proposed OLLK distribution such as the survival and hazard functions, quantile function, ordinary and incomplete moments, moment generating function, probability weighted moment, distribution of order statistic and Renyi entropy were derived. Five estimators are examined for unknown model parameters. The performance of the estimators is compared using an extensive simulation study based on the bias and mean square error criteria. Two Covid-19 data sets representing the percentage of daily recoveries of Covid-19 patients are used to illustrate the applicability of the proposed OLLK distribution. Results revealed that the OLLK distribution is a better alternative to some existing models with bounded support.
本文利用奇数对数库马拉斯瓦米-库马拉斯瓦米分布(OLLK)对 Covid-19 数据进行了统计分析。本文推导了 OLLK 分布的一些数学性质,如生存和危险函数、量子函数、普通矩和不完全矩、矩产生函数、概率加权矩、阶次统计量分布和 Renyi 熵。对未知模型参数的五个估计器进行了检验。根据偏差和均方误差标准,通过广泛的模拟研究对估计器的性能进行了比较。两个 Covid-19 数据集代表了 Covid-19 患者每日康复的百分比,用来说明所提出的 OLLK 分布的适用性。结果显示,OLLK 分布是一些现有有界支持模型的更好替代品。
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引用次数: 0
Estimation of the Multicomponent Stress-Strength Reliability Model Under the Topp-Leone Distribution: Applications, Bayesian and Non-Bayesian Assessement Topp-Leone 分布下的多成分应力-强度可靠性模型估计:应用、贝叶斯和非贝叶斯评估
Pub Date : 2023-11-13 DOI: 10.19139/soic-2310-5070-1685
M. Rasekhi, M. Saber, H. Yousof, Emadeldin I. A. Ali
The advantages of applying multicomponent stress-strength models lie in their ability to provide a comprehensive and accurate analysis of system reliability under real-world conditions. By accounting for the interactions between different stress components and identifying critical weaknesses, engineers can make informed decisions, leading to safer and more reliable designs. The primary emphasis of this research is placed on the Bayesian and classical estimations of a multicomponent stress-strength reliability model that is derived from the bounded Topp Leone distribution. It is presumable that both stress and strength follow a Topp Leone distribution, but the shape parameters of each variable differ, and the scale parameters (which determine where the variable is bounded) remain the same. Statisticians utilize approaches such as maximum likelihood paired with parametric and non-parametric bootstrap, as well as Bayesian methods, in order to evaluate the dependability of a system. Bayesian methods are also utilized. Simulation studies are carried out with the intention of establishing the degree of precision that may be achieved by employing the various methods of estimating. For the sake of this example, two genuine data sets are dissected and examined in detail.
应用多成分应力-强度模型的优势在于,它们能够在实际条件下对系统的可靠性进行全面而准确的分析。通过考虑不同应力成分之间的相互作用并找出关键弱点,工程师可以做出明智的决策,从而实现更安全、更可靠的设计。本研究的主要重点是对有界 Topp Leone 分布推导出的多成分应力-强度可靠性模型进行贝叶斯和经典估计。假定应力和强度都遵循 Topp Leone 分布,但每个变量的形状参数不同,尺度参数(决定变量的有界位置)保持不变。统计学家利用最大似然法、参数和非参数自举法以及贝叶斯法等方法来评估系统的可靠性。贝叶斯方法也得到了利用。进行模拟研究的目的是确定采用各种估计方法可能达到的精确程度。在本示例中,将对两组真实数据进行详细分析和研究。
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引用次数: 0
The Topp-Leone Odd Burr X-G Family of Distributions: Properties and Applications 托普-里昂奇数伯尔 X-G 分布家族:性质与应用
Pub Date : 2023-11-13 DOI: 10.19139/soic-2310-5070-1673
B. Oluyede, B. Tlhaloganyang, Whatmore Sengweni
This paper proposes a new generalized family of distributions called the Topp-Leone odd Burr X-G (TLOBX-G) distribution and its special model, Topp-Leone odd Burr X-Weibull (TLOBX-W) is studied in detail. Structural properties are derived, including the hazard rate function, quantile function, density expansion, moments, R'enyi entropy, and order statistics. The maximum likelihood technique is used to estimate the parameters of the new family of distributions and a simulation study was carried out to assess the accuracy and consistency of these estimators. Finally, the applicability, usefulness, and flexibility of TLOBX-W distribution are illustrated using two real-life datasets.
本文提出了一个新的广义分布族,称为 Topp-Leone 奇布尔 X-G 分布 (TLOBX-G),并详细研究了其特殊模型 Topp-Leone 奇布尔 X-Weibull 分布 (TLOBX-W)。得出的结构特性包括危险率函数、量子函数、密度扩展、矩、R'enyi entropy 和阶次统计量。使用最大似然法估计了新分布系列的参数,并进行了模拟研究,以评估这些估计值的准确性和一致性。最后,利用两个真实数据集说明了 TLOBX-W 分布的适用性、实用性和灵活性。
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引用次数: 0
A new routing method based on ant colony optimization in vehicular ad-hoc network 基于蚁群优化的车载 ad-hoc 网络路由新方法
Pub Date : 2023-11-13 DOI: 10.19139/soic-2310-5070-1766
Oussama Sbayti, Khalid Housni
Vehicular Ad hoc Networks (VANETs) face significant challenges in providing high-quality service. These networks enable vehicles to exchange critical information, such as road obstacles and accidents, and support various communication modes known as Vehicle-to-Everything (V2X). This research paper proposes an intelligent method to improve the quality of service by optimizing path selection between vehicles, aiming to minimize network overhead and enhance routing efficiency. The proposed approach integrates Ant Colony Optimization (ACO) into the Optimized Link State Routing (OLSR) protocol. The effectiveness of this method is validated through implementation and simulation experiments conducted using the Simulation of Urban Mobility (SUMO) and the network simulator (NS3). Simulation results demonstrate that the proposed method outperforms the traditional OLSR algorithm in terms of throughput, average packet delivery rate (PDR), end-to-end delay (E2ED), and average routing overhead.
车载 Ad hoc 网络(VANET)在提供高质量服务方面面临巨大挑战。这些网络使车辆能够交换道路障碍和事故等重要信息,并支持各种通信模式,即车对物(V2X)。本研究论文提出了一种通过优化车辆间路径选择来提高服务质量的智能方法,旨在最大限度地减少网络开销并提高路由效率。所提出的方法将蚁群优化(ACO)集成到优化链路状态路由(OLSR)协议中。通过使用城市移动性仿真(SUMO)和网络仿真器(NS3)进行实施和仿真实验,验证了该方法的有效性。仿真结果表明,所提出的方法在吞吐量、平均数据包交付率(PDR)、端到端延迟(E2ED)和平均路由开销方面都优于传统的 OLSR 算法。
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引用次数: 0
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Statistics, Optimization & Information Computing
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