Fusion model

  • 文章类型: Journal Article
    在组织病理学领域,关于使用人工智能(AI)技术对整个幻灯片图像(WSI)进行分类的许多研究已经报道。我们已经研究了神经胶质瘤的疾病进展评估。成人型弥漫性胶质瘤,一种脑肿瘤,被分类为星形细胞瘤,少突胶质细胞瘤,和胶质母细胞瘤.星形细胞瘤和少突胶质细胞瘤也被称为低级别胶质瘤(LGG),胶质母细胞瘤也称为多形性胶质母细胞瘤(GBM)。LGG患者经常具有异柠檬酸脱氢酶(IDH)突变。据报道,有IDH突变的患者比没有IDH突变的患者预后更好。因此,IDH突变是神经胶质瘤分类的重要指标。这就是为什么我们专注于IDH1突变。在本文中,我们旨在使用WSI和神经胶质瘤患者的临床数据对IDH1突变的存在与否进行分类.WSI模型和临床数据模型之间的集成学习用于对IDH1突变的存在或不存在进行分类。通过使用幻灯片级别标签,我们结合了来自苏木精和曙红(H&E)染色的WSI的基于贴片的成像信息,以及使用深度图像特征提取和机器学习分类器预测546例患者中IDH1基因突变的临床数据。我们实验了不同的深度学习(DL)模型,包括基于注意力的多实例学习(ABMIL)模型以及临床变量的梯度增强机(LightGBM)。Further,我们使用超参数优化来找到分类精度方面的最佳整体模型。我们获得了WSI的最高曲线下面积(AUC)为0.823,0.782的临床数据,使用MaxViT和LightGBM组合的集合结果为0.852,分别。我们的实验结果表明,通过使用临床数据和图像可以提高AI模型的整体准确性。
    In the field of histopathology, many studies on the classification of whole slide images (WSIs) using artificial intelligence (AI) technology have been reported. We have studied the disease progression assessment of glioma. Adult-type diffuse gliomas, a type of brain tumor, are classified into astrocytoma, oligodendroglioma, and glioblastoma. Astrocytoma and oligodendroglioma are also called low grade glioma (LGG), and glioblastoma is also called glioblastoma multiforme (GBM). LGG patients frequently have isocitrate dehydrogenase (IDH) mutations. Patients with IDH mutations have been reported to have a better prognosis than patients without IDH mutations. Therefore, IDH mutations are an essential indicator for the classification of glioma. That is why we focused on the IDH1 mutation. In this paper, we aimed to classify the presence or absence of the IDH1 mutation using WSIs and clinical data of glioma patients. Ensemble learning between the WSIs model and the clinical data model is used to classify the presence or absence of IDH1 mutation. By using slide level labels, we combined patch-based imaging information from hematoxylin and eosin (H & E) stained WSIs, along with clinical data using deep image feature extraction and machine learning classifier for predicting IDH1 gene mutation prediction versus wild-type across cohort of 546 patients. We experimented with different deep learning (DL) models including attention-based multiple instance learning (ABMIL) models on imaging data along with gradient boosting machine (LightGBM) for the clinical variables. Further, we used hyperparameter optimization to find the best overall model in terms of classification accuracy. We obtained the highest area under the curve (AUC) of 0.823 for WSIs, 0.782 for clinical data, and 0.852 for ensemble results using MaxViT and LightGBM combination, respectively. Our experimental results indicate that the overall accuracy of the AI models can be improved by using both clinical data and images.
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  • 文章类型: Journal Article
    就中风患病率而言,中国人口在全球名列前茅。在临床诊断过程中,放射科医生利用计算机断层扫描血管造影(CTA)图像进行诊断,能够精确评估中风患者大脑的侧支循环。最近的研究经常结合成像和机器学习方法来开发计算机辅助诊断算法。然而,在有关侧支循环评估的研究中,提取的成像特征主要由手动设计的统计特征组成,它们在代表性方面表现出显著的局限性。使用脑CTA图像中的图像特征准确评估侧支循环仍然存在挑战。
    为了解决这个问题,考虑到公共可访问的医疗数据集的稀缺性,我们将临床数据与影像学数据相结合,建立了一个名为RadiomicsClinicCTA的数据集.此外,我们设计了两种侧支循环评估模型,以利用患者临床信息和影像学数据的协同潜力来更准确地评估侧支循环:数据级融合和特征级融合.要从数据集中删除冗余特征,我们采用Levene检验和T检验方法进行特征预筛选。随后,我们使用LASSO和随机森林算法进行了特征降维,并在特征工程后的数据级融合数据集上使用各种机器学习算法训练了分类模型.
    在RadiomicsClinicCTA数据集上的实验结果表明,优化的数据级融合模型实现了超过86%的准确性和AUC值。随后,我们训练并评估了特征级融合分类模型的性能.结果表明,特征级融合分类模型优于优化的数据级融合模型。比较实验表明,相对于纯放射组学数据集,融合的数据集更好地区分好的和坏的侧分支特征。
    我们的研究强调了通过融合模型整合临床和成像数据的有效性,显著提高卒中患者侧支循环评估的准确性。
    UNASSIGNED: The Chinese population ranks among the highest globally in terms of stroke prevalence. In the clinical diagnostic process, radiologists utilize computed tomography angiography (CTA) images for diagnosis, enabling a precise assessment of collateral circulation in the brains of stroke patients. Recent studies frequently combine imaging and machine learning methods to develop computer-aided diagnostic algorithms. However, in studies concerning collateral circulation assessment, the extracted imaging features are primarily composed of manually designed statistical features, which exhibit significant limitations in their representational capacity. Accurately assessing collateral circulation using image features in brain CTA images still presents challenges.
    UNASSIGNED: To tackle this issue, considering the scarcity of publicly accessible medical datasets, we combined clinical data with imaging data to establish a dataset named RadiomicsClinicCTA. Moreover, we devised two collateral circulation assessment models to exploit the synergistic potential of patients\' clinical information and imaging data for a more accurate assessment of collateral circulation: data-level fusion and feature-level fusion. To remove redundant features from the dataset, we employed Levene\'s test and T-test methods for feature pre-screening. Subsequently, we performed feature dimensionality reduction using the LASSO and random forest algorithms and trained classification models with various machine learning algorithms on the data-level fusion dataset after feature engineering.
    UNASSIGNED: Experimental results on the RadiomicsClinicCTA dataset demonstrate that the optimized data-level fusion model achieves an accuracy and AUC value exceeding 86%. Subsequently, we trained and assessed the performance of the feature-level fusion classification model. The results indicate the feature-level fusion classification model outperforms the optimized data-level fusion model. Comparative experiments show that the fused dataset better differentiates between good and bad side branch features relative to the pure radiomics dataset.
    UNASSIGNED: Our study underscores the efficacy of integrating clinical and imaging data through fusion models, significantly enhancing the accuracy of collateral circulation assessment in stroke patients.
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  • 文章类型: Journal Article
    由于工作环境的要求,船用轴流控制阀需要在保证过流能力满足要求的同时尽可能降低噪声。为了提高轴流控制阀的降噪效果,提出了一种基于Stacking集成学习与粒子群优化(PSO)相结合的轴流控制阀多级降压套优化方法。用计算流体力学方法预测轴流控制阀的液体动态噪声和流量值根据对其性能的初步评估,通过三维建模软件对多级减压套筒的结构参数进行参数化。设计变量的范围被约束以形成设计空间,用最优拉丁超立方体方法对设计空间进行采样,形成样本空间。建立了一个自动化的求解平台,用于求解不同结构参数下的噪声和流量值。采用Stacking方法融合决策树回归的三个基学习器,Kriging,和支持向量回归得到预测精度较好的结构优化融合模型,通过三个不同的判定系数误差度量(R2)来评估融合模型的准确性,均方根误差,和平均绝对误差。然后利用粒子群优化算法对融合模型进行优化,得到最优结构参数组合。优化后的多级降压结构参数如下:孔径t1=3.8mm,孔间距t2=1毫米,拉孔角度t3=6.4°,孔深t4=3.4mm,两层节流套间距t5=4mm。结果表明,优化前后噪声的峰值声压级分别为91.32dB(A)和78.2dB(A),分别,比优化前降低了约14.4%。优化后的流量特性曲线仍保持百分流量特性,满足最大开度流量Kv≥60的要求。该优化方法为轴流控制阀的结构优化提供了参考。
    Due to the requirements of the working environment, the marine axial flow control valve needs to reduce the noise as much as possible while ensuring the flow capacity to meet the requirements. To improve the noise reduction effect of the axial flow control valve, this paper proposes a Stacking integrated learning combined with particle swarm optimization (PSO) method to optimize a multi-stage step-down sleeve of the axial flow control valve. The liquid dynamic noise and flow value of the axial flow control valve are predicted by computational fluid dynamics. Based on the preliminary evaluation of its performance, the structural parameters of the multi-stage pressure-reducing sleeve are parameterized by three-dimensional modeling software. The range of design variables is constrained to form the design space, and the design space is sampled by the optimal Latin hypercube method to form the sample space. An automated solution platform is built to solve noise and flow values under different structural parameters. The Stacking method is used to fuse the three base learners of decision tree regression, Kriging, and support vector regression to obtain a structural optimization fusion model with better prediction accuracy, and the accuracy of the fusion model is evaluated by three different error metrics of coefficient of determination (R2), Root Mean Squared Error, and Mean Absolute Error. Then the PSO particle swarm optimization algorithm is used to optimize the fusion model to obtain the optimal structural parameter combination. The optimized multi-stage depressurization structure parameters are as follows: hole diameter t1 = 3.8 mm, hole spacing t2 = 1 mm, hole drawing angle t3 = 6.4°, hole depth t4 = 3.4 mm, and two-layer throttling sleeve spacing t5 = 4 mm. The results show that the peak sound pressure level of the noise before and after optimization is 91.32 dB(A) and 78.2 dB(A), respectively, which is about 14.4% lower than that before optimization. The optimized flow characteristic curve still maintains the percentage flow characteristic and meets the requirement of flow capacity Kv ≥ 60 at the maximum opening. The optimization method provides a reference for the structural optimization of the axial flow control valve.
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  • 文章类型: Journal Article
    本研究旨在开发一种基于影像组学和深度学习特征的模型,以预测接受高强度聚焦超声(HIFU)治疗的子宫腺肌病患者的消融率。回顾性分析119例接受HIFU治疗的子宫腺肌病患者。参与者以7:3的比例被纳入培训和测试队列。从T2加权成像(T2WI)图像中提取影像组学特征,VGG-19用于提取高级深层特征。提出了一种基于多模型融合的集成模型,用于预测子宫腺肌病HIFU的疗效。它由四个基分类器组成,并使用精度进行了评估,精度,召回,F分数,和接受者工作特征曲线下面积(AUC)。结合影像组学和深度学习特征的组合模型的预测性能优于单独的影像组学和深度学习特征模型,训练集和测试集的准确度为0.848和0.814,AUC分别为0.916和0.861。与构成多模型融合模型的基分类器相比,融合模型也表现出更好的预测性能。融合影像组学和深度学习特征的融合模型对HIFU治疗下子宫腺肌病的消融率具有一定的预测价值,可以帮助选择从HIFU治疗中受益的子宫腺肌病患者。
    This study aimed to develop a model based on radiomics and deep learning features to predict the ablation rate in patients with adenomyosis undergoing high-intensity focused ultrasound (HIFU) therapy. A total of 119 patients with adenomyosis who received HIFU therapy were retrospectively analyzed. Participants were included in the training and testing queues in a 7:3 ratio. Radiomics features were extracted from T2-weighted imaging (T2WI) images, and VGG-19 was used to extract advanced deep features. An ensemble model based on multi-model fusion for predicting the efficacy of HIFU in adenomyosis was proposed, which consists of four base classifiers and was evaluated using accuracy, precision, recall, F-score, and area under the receiver operating characteristic curve (AUC). The predictive performance of the combined model combining radiomics and deep learning features outperformed the radiomics and deep learning feature models alone, with accuracy of 0.848 and 0.814 in training and test sets, and AUC of 0.916 and 0.861, respectively. Compared with the base classifiers that make up the multi-model fusion model, the fusion model also exhibited better prediction performance. The fusion model incorporating both radiomics and deep learning features had certain predictive value for the ablation rate of adenomyosis under HIFU therapy and could help select patients with adenomyosis who would benefit from HIFU therapy.
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  • 文章类型: Journal Article
    睡眠呼吸暂停综合征(SAS)是一种严重的睡眠障碍,早期发现睡眠呼吸暂停不仅可以降低治疗成本,而且可以挽救生命。传统的多导睡眠图(PSG)被广泛认为是睡眠呼吸暂停的黄金标准诊断工具。然而,这种方法很昂贵,耗时且本质上干扰睡眠。最近的研究指出,心电图分析是一种简单有效的睡眠呼吸暂停的诊断方法,这可以有效地为医生提供诊断的帮助,减少患者的痛苦。
    为此,本文提出了一种基于LightGBM混合模型的心电信号信号对睡眠呼吸暂停的有效检测。首先,引入改进的隔离森林算法去除异常数据,解决数据样本不平衡问题。其次,通过改进的TPE(树结构ParzenEstimator)算法对LightGBM算法的参数进行优化,确定模型的最佳参数配置。最后,融合模型TPE_OptGBM用于检测睡眠呼吸暂停。在实验阶段,我们基于马尔堡菲利普斯大学提供的睡眠呼吸暂停心电图数据库验证了模型,德国。
    实验结果表明,本文提出的模型达到了95.08%的精度,精度为94.80%,召回97.51%,F1值为96.14%。
    所有这些评估指标都优于当前的主流型号,这将有助于医生的诊断过程,并为患者提供更好的医疗体验。
    UNASSIGNED: Sleep apnoea syndrome (SAS) is a serious sleep disorder and early detection of sleep apnoea not only reduces treatment costs but also saves lives. Conventional polysomnography (PSG) is widely regarded as the gold standard diagnostic tool for sleep apnoea. However, this method is expensive, time-consuming and inherently disruptive to sleep. Recent studies have pointed out that ECG analysis is a simple and effective diagnostic method for sleep apnea, which can effectively provide physicians with an aid to diagnosis and reduce patients\' suffering.
    UNASSIGNED: To this end, in this paper proposes a LightGBM hybrid model based on ECG signals for efficient detection of sleep apnea. Firstly, the improved Isolated Forest algorithm is introduced to remove abnormal data and solve the data sample imbalance problem. Secondly, the parameters of LightGBM algorithm are optimised by the improved TPE (Tree-structured Parzen Estimator) algorithm to determine the best parameter configuration of the model. Finally, the fusion model TPE_OptGBM is used to detect sleep apnoea. In the experimental phase, we validated the model based on the sleep apnoea ECG database provided by Phillips-University of Marburg, Germany.
    UNASSIGNED: The experimental results show that the model proposed in this paper achieves an accuracy of 95.08%, a precision of 94.80%, a recall of 97.51%, and an F1 value of 96.14%.
    UNASSIGNED: All of these evaluation indicators are better than the current mainstream models, which is expected to assist the doctor\'s diagnostic process and provide a better medical experience for patients.
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  • 文章类型: Journal Article
    抗微生物肽(AMP)由于其针对多种病原体的广谱活性,是开发新抗生素的有希望的候选药物。然而,由于其复杂的结构和不同的序列,通过大量候选物识别AMP具有挑战性。在这项研究中,我们提议SenseXAMP,一个跨模式框架,利用输入序列的语义嵌入和蛋白质描述符(PD)来提高AMP的识别性能。SenseXAMP包括多输入对齐模块和交叉表示融合模块,以探索两个输入特征之间的隐藏信息,并更好地利用融合特征。为了更好地解决AMP识别任务,我们积累了最新的带注释的AMP数据,以形成更慷慨的基准数据集。此外,我们通过添加AMPs回归任务来扩展现有的AMPs鉴定任务设置,以满足更具体的要求,如抗菌活性预测.实验结果表明,SenseXAMP在多个AMP相关数据集上的性能优于现有的最新模型,包括常用的AMP分类数据集和我们提出的基准数据集。此外,我们进行了一系列实验,以证明传统PD和蛋白质预训练模型在AMPs任务中的互补性.我们的实验表明,SenseXAMP可以有效地结合PD的优势,以提高AMPs任务中蛋白质预训练模型的性能。
    Antimicrobial peptides (AMPs) are promising candidates for the development of new antibiotics due to their broad-spectrum activity against a range of pathogens. However, identifying AMPs through a huge bunch of candidates is challenging due to their complex structures and diverse sequences. In this study, we propose SenseXAMP, a cross-modal framework that leverages semantic embeddings of and protein descriptors (PDs) of input sequences to improve the identification performance of AMPs. SenseXAMP includes a multi-input alignment module and cross-representation fusion module to explore the hidden information between the two input features and better leverage the fusion feature. To better address the AMPs identification task, we accumulate the latest annotated AMPs data to form more generous benchmark datasets. Additionally, we expand the existing AMPs identification task settings by adding an AMPs regression task to meet more specific requirements like antimicrobial activity prediction. The experimental results indicated that SenseXAMP outperformed existing state-of-the-art models on multiple AMP-related datasets including commonly used AMPs classification datasets and our proposed benchmark datasets. Furthermore, we conducted a series of experiments to demonstrate the complementary nature of traditional PDs and protein pre-training models in AMPs tasks. Our experiments reveal that SenseXAMP can effectively combine the advantages of PDs to improve the performance of protein pre-training models in AMPs tasks.
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  • 文章类型: Journal Article
    阻塞性睡眠呼吸暂停低通气综合征(OSAHS)是一种慢性常见的睡眠呼吸疾病,可对患者的生活产生负面影响并引起严重的伴随疾病。多导睡眠图(PSG)是诊断OSAHS的金标准,但价格昂贵,需要过夜住院。打鼾是OSAHS的典型症状。本研究提出了一种有效的基于打鼾声分析的OSAHS筛查方法。根据实时PSG记录,将鼻涕标记为OSAHS相关的打鼾声音和简单的打鼾声音。使用了三个模型,包括与XGBoost结合的声学功能,梅尔谱结合卷积神经网络(CNN),和Mel谱结合残差神经网络(ResNet)。Further,通过软投票将这三个模型融合以检测这两种类型的打鼾声音。根据这些识别的打鼾声音估计受试者的呼吸暂停低通气指数(AHI)。融合模型的准确率和召回率分别达到83.44%和85.27%,预测的AHI与PSG的Pearson相关系数为0.913(R2=0.834,p<0.001)。结果证明了基于打鼾声分析预测AHI的有效性,并显示了在家中监测OSAHS的巨大潜力。
    Obstructive sleep apnea-hypopnea syndrome (OSAHS) is a chronic and common sleep-breathing disease that could negatively influence lives of patients and cause serious concomitant diseases. Polysomnography(PSG) is the gold standard for diagnosing OSAHS, but it is expensive and requires overnight hospitalization. Snoring is a typical symptom of OSAHS. This study proposes an effective OSAHS screening method based on snoring sound analysis. Snores were labeled as OSAHS related snoring sounds and simple snoring sounds according to real-time PSG records. Three models were used, including acoustic features combined with XGBoost, Mel-spectrum combined with convolution neural network (CNN), and Mel-spectrum combined with residual neural network (ResNet). Further, the three models were fused by soft voting to detect these two types of snoring sounds. The subject\'s apnea-hypopnea index (AHI) was estimated according to these recognized snoring sounds. The accuracy and recall of the proposed fusion model achieved 83.44% and 85.27% respectively, and the predicted AHI has a Pearson correlation coefficient of 0.913 (R2 = 0.834, p < 0.001) with PSG. The results demonstrate the validity of predicting AHI based on analysis of snoring sound and show great potential for monitoring OSAHS at home.
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  • 文章类型: Journal Article
    我们的研究调查了基于图形的成像数据与非成像电子健康记录(EHR)数据融合是否可以改善2019年冠状病毒病(COVID-19)患者的疾病轨迹预测,而不仅仅是成像或非成像EHR数据的预测性能。
    我们提出了一个用于细粒度临床结果预测的融合框架[出院,重症监护病房(ICU)入院,或死亡]使用基于相似性的图形结构融合成像和非成像信息。节点特征由图像嵌入表示,和边缘编码具有临床或人口统计学相似性。
    对从EmoryHealthcareNetwork收集的数据进行的实验表明,我们的融合建模方案的性能始终优于仅使用成像或非成像功能开发的预测模型。出院时,接受者工作特性曲线下的面积为0.76、0.90和0.75,死亡率,ICU入院,分别。对从梅奥诊所收集的数据进行外部验证。我们的方案突出了模型预测中的已知偏差,例如对有酗酒史的患者的偏见和基于保险状况的偏见。
    我们的研究表明,融合多种数据模式对于准确预测临床轨迹的重要性。所提出的图结构可以基于非成像EHR数据对患者之间的关系进行建模,和图卷积网络可以将这种关系信息与成像数据融合,从而比仅采用成像或非成像数据的模型更有效地预测未来的疾病轨迹。我们的基于图的融合建模框架可以轻松扩展到其他预测任务,以有效地将成像数据与非成像临床数据相结合。
    UNASSIGNED: Our study investigates whether graph-based fusion of imaging data with non-imaging electronic health records (EHR) data can improve the prediction of the disease trajectories for patients with coronavirus disease 2019 (COVID-19) beyond the prediction performance of only imaging or non-imaging EHR data.
    UNASSIGNED: We present a fusion framework for fine-grained clinical outcome prediction [discharge, intensive care unit (ICU) admission, or death] that fuses imaging and non-imaging information using a similarity-based graph structure. Node features are represented by image embedding, and edges are encoded with clinical or demographic similarity.
    UNASSIGNED: Experiments on data collected from the Emory Healthcare Network indicate that our fusion modeling scheme performs consistently better than predictive models developed using only imaging or non-imaging features, with area under the receiver operating characteristics curve of 0.76, 0.90, and 0.75 for discharge from hospital, mortality, and ICU admission, respectively. External validation was performed on data collected from the Mayo Clinic. Our scheme highlights known biases in the model prediction, such as bias against patients with alcohol abuse history and bias based on insurance status.
    UNASSIGNED: Our study signifies the importance of the fusion of multiple data modalities for the accurate prediction of clinical trajectories. The proposed graph structure can model relationships between patients based on non-imaging EHR data, and graph convolutional networks can fuse this relationship information with imaging data to effectively predict future disease trajectory more effectively than models employing only imaging or non-imaging data. Our graph-based fusion modeling frameworks can be easily extended to other prediction tasks to efficiently combine imaging data with non-imaging clinical data.
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  • 文章类型: Journal Article
    随着“碳中和”和“碳峰”逐渐成为现阶段的全球目标,敦促企业在其业务运营中继续实施可持续发展战略。面对激烈的市场竞争,高科技企业(HTE)需要更好地管理金融风险并避免金融危机。最流行的机器学习模型-逻辑回归,XGBoost,和BP神经网络-被选为本研究的基础模型。使用堆叠方法将这三个模型组合在一起,以训练和预测融合模型,同时为其他研究人员提供一些基本的模型研究思路。通过对比各种定量基础模型的融合以及投票和平均的融合程序,同时建立了HTE的财务危机预警(FCEW)。结果表明,融合模型在性能方面优于单一模型,堆叠融合模型的预警效果最好。通过比较和比较三种融合模型对高新技术企业财务危机预警的效果,弥补了传统预测方法精度低的缺陷。提高了企业的可持续发展道路。
    Enterprises are urged to continue implementing the sustainable development strategy in their business operations as \"carbon neutrality\" and \"carbon peak\" gradually become the current stage\'s worldwide targets. High-tech businesses (HTE) need to be better equipped to manage financial risks and avoid financial crises in the face of severe market competition. The most popular machine learning models-logistic regression, XGBoost, and BP neural networks-are chosen as the base models in this study. The three models are combined using the stacking method to train and forecast the fusion models while offering other researchers some basic model research ideas. The financial crisis early warning (FCEW) of HTE is built concurrently by contrasting the fusion of various quantitative basis models and the fusion procedures of voting and averaging. The outcomes demonstrate that the fusion model outperforms the single model in terms of performance, and the stacked fusion model has the best early warning impact. By comparing and comparing the effect of three fusion models on financial crisis warnings of high-tech enterprises, it makes up for the defect of low accuracy of traditional forecasting methods. It improves the sustainable development path of enterprises.
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  • 文章类型: Journal Article
    化学纯的塑料颗粒用作塑料零件生产中的起始材料。挤出机依靠纯度,否则资源会丢失,产生废物。为了避免损失,机器需要分析原材料。可见和近红外范围内的光谱和机器学习可以用作分析仪。我们提出了一种方法,使用两个光谱仪,光谱范围为400-1700nm,融合模型包括分类,回归,并进行验证,以检测25种材料及其二元混合物的比例。利用一维卷积神经网络进行分类,利用偏最小二乘回归进行比例估计。通过使用线性最小二乘拟合中的组分光谱重建样品光谱来验证分类。为了节省时间和精力,融合模型是在半经验光谱数据上训练的。凭经验获取组分光谱,并将二元混合物光谱计算为线性组合。融合模型在可见光和近红外光谱数据上实现了非常高的精度。即使在400-1100nm的较小光谱范围内,精度很高。可见和近红外光谱以及所提出的融合模型可以用作构建分析仪的概念。可以使用廉价的基于硅传感器的光谱仪。
    Chemically pure plastic granulate is used as the starting material in the production of plastic parts. Extrusion machines rely on purity, otherwise resources are lost, and waste is produced. To avoid losses, the machines need to analyze the raw material. Spectroscopy in the visible and near-infrared range and machine learning can be used as analyzers. We present an approach using two spectrometers with a spectral range of 400-1700 nm and a fusion model comprising classification, regression, and validation to detect 25 materials and proportions of their binary mixtures. one dimensional convolutional neural network is used for classification and partial least squares regression for the estimation of proportions. The classification is validated by reconstructing the sample spectrum using the component spectra in linear least squares fitting. To save time and effort, the fusion model is trained on semi-empirical spectral data. The component spectra are acquired empirically and the binary mixture spectra are computed as linear combinations. The fusion model achieves very a high accuracy on visible and near-infrared spectral data. Even in a smaller spectral range from 400-1100 nm, the accuracy is high. The visible and near-infrared spectroscopy and the presented fusion model can be used as a concept for building an analyzer. Inexpensive silicon sensor-based spectrometers can be used.
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