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A novel deep learning framework with variational auto-encoder for indoor air quality prediction

Frontiers of Environmental Science & Engineering 2024年第1期18卷 97-109页

作者： Qiyue Wu Yun Geng Xinyuan wang dongsheng wang ChangKyoo Yoo Hongbin Liu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China College of Automation&College of Artificial Intelligence Nanjing University of Posts and TelecommunicationsNanjing 210023China Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control College of Light Industry and Food EngineeringGuangxi UniversityNanning 530004China Laboratory for Comprehensive Utilization of Paper Waste of Shandong Province Shandong Huatai Paper Co.Ltd.Dongying 257335China Department of Environmental Science and Engineering College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

Exposure to poor indoor air conditions poses significant risks to human health, increasing morbidity and mortality rates. Soft measurement modeling is suitable for stable and accurate monitoring of air pollutants and improving air quality. Based on partial least squares (PLS), we propose an indoor air quality prediction model that utilizes variational auto-encoder regression (VAER) algorithm. To reduce the negative effects of noise, latent variables in the original data are extracted by PLS in the first step. Then, the extracted variables are used as inputs to VAER, which improve the accuracy and robustness of the model. Through comparative analysis with traditional methods, we demonstrate the superior performance of our PLS-VAER model, which exhibits improved prediction performance and stability. The root mean square error (RMSE) of PLS-VAER is reduced by 14.71%, 26.47%, and 12.50% compared to single VAER, PLS-SVR, and PLS-ANN, respectively. Additionally, the coefficient of determination (R2) of PLS-VAER improves by 13.70%, 30.09%, and 11.25% compared to single VAER, PLS-SVR, and PLS-ANN, respectively. This research offers an innovative and environmentally-friendly approach to monitor and improve indoor air quality.

关键词： Indoor air quality PM_(2.5)concentration Variational auto-encoder Latent variable Soft measurement modeling

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Biomedical rare-earth magnesium alloy:Current status and future prospects

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Journal of Magnesium and Alloys 2024年第4期12卷 1260-1282页

作者： Mingli Yang Cheng Chen dongsheng wang Yinjin Shao Wenhao Zhou Cijun Shuai Youwen Yang Xinghai Ning Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes Tongling UniversityTongling 244061China Department of Rehabilitation Ganzhou People’s HospitalGanzhou 341099China Shaanxi Key Laboratory of Biomedical Metallic Materials Northwest Institute for Non-Ferrous Metal ResearchXi’an 710016China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China School of Mechanical and Electrical Engineering Jiangxi University of Science and TechnologyGanzhou 341000China College of Engineering and Applied Science Nanjing University210089China

Biomedical magnesium(Mg)alloys have garnered significant attention because of their unique biodegradability,favorable biocompatibility,and suitable mechanical *** incorporation of rare earth(RE)elements,with their distinct physical and chemical properties,has greatly contributed to enhancing the mechanical performance,degradation behavior,and biological performance of biomedical Mg ***,a series of RE-Mg alloys are being designed and investigated for orthopedic implants and cardiovascular stents,achieving substantial and encouraging research *** this work,a comprehensive summary of the state-of-the-art in biomedical RE-Mg alloys is *** physiological effects and design standards of RE elements in biomedical Mg alloys are ***,the degradation behavior and mechanical properties,including their underlying action are studied ***,the preparation techniques and current application status of RE-Mg alloys are ***,we address the ongoing challenges and propose future prospects to guide the development of high-performance biomedical Mg-RE alloys.

关键词： Magnesium alloy Rare earth elements Biodegradation behavior Mechanical performance Biological properties

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A computed tomography-based radiomic model for the prediction of strangulation risk in patients with acute intestinal obstruction

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Intelligent Medicine 2024年第1期4卷 33-42页

作者： Zhibo wang Ruiqing Liu Shunli Liu Baoying Sun Wentao Xie dongsheng wang Yun Lu Department of Gastroenterological Surgery The Affiliated Hospital of Qingdao UniversityQingdaoShandong 266003China Department of Radiology The Affiliated Hospital of Qingdao UniversityQingdaoShandong 266003China Neurology Department Central Hospital Affiliated to Shandong First Medical UniversityJinanShandong 250000China Lingshui People’s Hospital LingshuiHainan 572400China

Background We created and validated a computed tomography(CT)-based radiomic model using both clinical factors and the radiomic signature for assessing the strangulation risk of acute intestinal *** would assist surgeons in accurately predicting intestinal ischemia and strangulation in patients with intestinal *** We recruited 289 patients with acute intestinal obstruction admitted in the Affiliated Hospital of Qingdao University from January 2019 to February *** patients were allocated to a training(n=226)and validation cohort(n=63).Radiomic features were collected from CT images,and the radiomic signature was extracted and used to calculate a radiomic score(Rad-score).A nomogram was constructed using the clinical features and the Rad-score,and the performance of the clinical,radiomics,and nomogram models was assessed in the two *** Six robust features were used to construct the radiomic *** nomogram incorporating hemoglobin levels,C-reactive protein levels,American Society of Anesthesiologists score,time of obstruction,CT image of mesenteric fluid(P<0.05),and the signature demonstrated good predictive ability for intestinal ischemia in patients with acute intestinal obstruction,with areas under the curve of 0.892(95%confidence interval,0.837–0.947)and 0.781(95%confidence interval,0.619–0.944)for the training and validation sets,*** decision curve analysis showed that this model outperformed the clinical and radiomic signature *** The radiomic nomogram may effectively predict intestinal ischemia in patients with acute intestinal disease and may assist clinical decision-making。

关键词： Acute intestinal obstruction Radiomics Intestinal ischemia Intestinal strangulation

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Contract Mechanism of Water Environment Regulation for Small and Medium Sized Enterprises Based on Optimal Control Theory

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Journal of Water Resource and Protection 2024年第7期16卷 538-556页

作者： Shuang Zhao Hongbin Gu Lianfang Xue dongsheng wang Bin Huang China Institute of Water Resources and Hydropower Research Beijing China China Renewable Engineering Institute Beijing China School of Environmental Science and Engineering Tianjin University Tianjin China

The small and scattered enterprise pattern in the county economy has formed numerous sporadic pollution sources, hindering the centralized treatment of the water environment, increasing the cost and difficulty of treatment. How enterprises can make reasonable decisions on their water environment behavior based on the external environment and their own factors is of great significance for scientifically and effectively designing water environment regulation mechanisms. Based on optimal control theory, this study investigates the design of contractual mechanisms for water environmental regulation for small and medium-sized enterprises. The enterprise is regarded as an independent economic entity that can adopt optimal control strategies to maximize its own interests. Based on the participation of multiple subjects including the government, enterprises, and the public, an optimal control strategy model for enterprises under contractual water environmental regulation is constructed using optimal control theory, and a method for calculating the amount of unit pollutant penalties is derived. The water pollutant treatment cost data of a paper company is selected to conduct empirical numerical analysis on the model. The results show that the increase in the probability of government regulation and public participation, as well as the decrease in local government protection for enterprises, can achieve the same regulatory effect while reducing the number of administrative penalties per unit. Finally, the implementation process of contractual water environmental regulation for small and medium-sized enterprises is designed.

关键词： Optimal Control Theory Small and Medium-Sized Enterprises Water Environment Regulation Contract Mechanism

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Study on the Photosynthetic Characteristics of Six Varieties(Strains)in Chinese Chestnut

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Agricultural Biotechnology 2024年第1期13卷 9-14,57页

作者： Lizhi FU Yong YANG Xiaoxiao KANG Meng wang Jing LIU Xuan wang dongsheng wang Liyang YU Hai’e ZHANG College of Horticultural Science and Technology Hebei Normal University of Science and TechnologyQinhuangdao 066004China Engineering Research Center of Chestnut Industrial Technology Ministry of EducationQinhuangdao 066004China Key Laboratory of Germplasm Mining and Innovative Utilization of Characteristic Horticulture Hebei ProvinceQinhuangdao 066004China Hebei Chestnut Industry Collaborative Innovation Center Qinhuangdao 066004China

[Objectives]This study was conducted to investigate the differences of photosynthetic physiological characteristics of different varieties(strains),which will provide a theoretical basis for high photosynthesis efficiency breeding and application in Chinese chestnut.[Methods]Six Chinese chestnut varieties of Castanea mollissima‘Yanbao’,***‘Yanqiu’,***‘Yanchang’,***‘Yanjia’,***‘Qianxi 37’,and ***‘Hybrid 22’were used as the *** the portable photosynthesis system Li-6400,we measured the photosynthetic characteristics and diurnal variation of leaf samples of six different chestnut varieties or *** fitted the light response curves and photosynthetic parameters using the leaf floating ***,we determined the chlorophyll content in the leaves using a UV-visible spectrophotometer.[Results]Among the six chestnut varieties or strains,‘Yanqiu’exhibited a significantly higher photosynthetic light saturation point(P LSP)compared to other five varieties,and‘Hybrid 22’ranked second,indicating that these two varieties had the strongest adaptation to high light *** photosynthetic light compensation point(P LCP)of‘Yanchang’was significantly higher than other five varieties,and"Qianxi 37"ranked second,indicating that these two varieties had the strongest adaptation to low light ***,they exhibited higher chlorophyll content and maintained good photosynthetic characteristics even in shaded environments with weak light ***‘Yanbao’and‘Yanjia’showed higher P LSP and lower P LCP,indicating that these two varieties have a wider range of adaptation to light *** were capable of efficiently utilizing light across a broader spectrum of intensities.‘Yanqiu’had the highest maximum net photosynthetic rate(P n,max)and the lowest dark respiration rate(R d),along with the highest chlorophyll *** indicated that‘Yanqiu’has strong photosynthetic capacity and organic mat

关键词： Chinese chestnut Diurnal variation of photosynthesis Light response model Light response curve Chlorophyll

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基于法条知识的事理型类案检索方法

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浙江大学学报（工学版） 2024年第7期58卷 1357-1365页

作者：李林睿王东升范红杰浙江大学光华法学院浙江杭州310008 中国政法大学法治信息管理学院北京102249

现有类案检索研究忽略了模型应当蕴含的法律逻辑,无法适应实际应用中案件相似标准的要求;类案检索任务的中文数据集较少,难以满足研究需求现状.为此提出基于法律逻辑、有较强可解释性的类案检索模型,构建以谓语动词为基础的案件事理图谱... 详细信息

现有类案检索研究忽略了模型应当蕴含的法律逻辑,无法适应实际应用中案件相似标准的要求;类案检索任务的中文数据集较少,难以满足研究需求现状.为此提出基于法律逻辑、有较强可解释性的类案检索模型,构建以谓语动词为基础的案件事理图谱.将各类罪名对应的法条知识融入所提模型,将提取的不同要素输入以神经网络为基础的评分器以实现准确、高效的类案检索.构建针对类案检索任务、以易混淆罪名组为主要检索案由的Confusing-LeCaRD数据集,所提模型在LeCaRD数据集和Confusing-LeCaRD数据集上的归一化折损累计增益分别为90.95%和94.64%,在各项指标上均优于TF-IDF、BM25和BERT-PLI模型.

关键词：类案检索法条知识法律逻辑事理图谱深度学习

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无人机系列化旋翼气动噪声特性对比研究

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北京理工大学学报 2024年第5期44卷 468-475页

作者：闫清东王东升高普魏巍北京理工大学车辆传动国家重点实验室北京100081 北京理工大学重庆创新中心重庆401120

旋翼的气动噪声是各类旋翼无人机噪声的主要来源,为降低无人机整体噪声和提升其声隐身性能,文中针对某无人机的系列化等径旋翼开展定转速气动噪声特性的对比研究.分别建立各旋翼气动噪声特性预测大涡模拟计算模型,将获取的各旋翼表面压... 详细信息

旋翼的气动噪声是各类旋翼无人机噪声的主要来源,为降低无人机整体噪声和提升其声隐身性能,文中针对某无人机的系列化等径旋翼开展定转速气动噪声特性的对比研究.分别建立各旋翼气动噪声特性预测大涡模拟计算模型,将获取的各旋翼表面压力脉动信息作为声学求解输入,基于FW-H方程计算了等距(3R)和不同方位的旋翼远场噪声特性并进行了试验验证,5个型号旋翼等距处总声压级仿真与试验结果误差不大于4.3%,气动噪声呈现明显的偶极子特性,气动噪声径向声压级明显高于轴向值,且不同旋翼的气动噪声声压级与旋翼转矩具有正相关关系,与旋翼升力间关系则不明显.

关键词：旋翼气动噪声大涡模拟声压级

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面向SAR图像目标分类的CNN模型可视化方法

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雷达学报（中英文） 2024年第2期13卷 359-373页

作者：李妙歌陈渤王东升刘宏伟西安电子科技大学雷达信号处理全国重点实验室西安710071

卷积神经网络(CNN)在合成孔径雷达(SAR)图像目标分类任务中应用广泛。由于网络工作机理不透明,CNN模型难以满足高可靠性实际应用的要求。类激活映射方法常用于可视化CNN模型的决策区域,但现有方法主要基于通道级或空间级类激活权重,且在... 详细信息

卷积神经网络(CNN)在合成孔径雷达(SAR)图像目标分类任务中应用广泛。由于网络工作机理不透明,CNN模型难以满足高可靠性实际应用的要求。类激活映射方法常用于可视化CNN模型的决策区域,但现有方法主要基于通道级或空间级类激活权重,且在SAR图像数据集上的应用仍处于起步阶段。基于此,该文从神经元特征提取能力和网络决策依据两个层面出发,提出了一种面向SAR图像的CNN模型可视化方法。首先,基于神经元的激活值,对神经元在其感受野范围内的目标结构学习能力进行可视化,然后提出一种通道-空间混合的类激活映射方法,通过对SAR图像中的重要区域进行定位,为模型的决策过程提供依据。实验结果表明,该方法给出了模型在不同设置下的可解释性分析,有效拓展了卷积神经网络在SAR图像上的可视化应用。

关键词：合成孔径雷达可视化分析卷积神经网络类激活映射神经元

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截面削弱对轴心受压墙或柱稳定性的影响研究

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江苏建筑 2024年第2期 29-34,63页

作者：汪冬生南京南大工程检测有限公司江苏南京210002

为了解截面削弱与墙或柱危险点的关系,文章对不同位置受到不同程度截面削弱情况的轴心受压墙或柱的稳定性进行了研究。首先利用能量原理,推导在不同边界条件、轴心受压和小变形情况下,沿竖向受到不同位置、不同程度全截面削弱的墙或柱... 详细信息

为了解截面削弱与墙或柱危险点的关系,文章对不同位置受到不同程度截面削弱情况的轴心受压墙或柱的稳定性进行了研究。首先利用能量原理,推导在不同边界条件、轴心受压和小变形情况下,沿竖向受到不同位置、不同程度全截面削弱的墙或柱临界压力和稳定系数的近似计算公式,接着讨论了其相互关系,并提出了墙或柱稳定性加固的最优位置。通过与有限元软件计算结果的对比,探讨了近似公式的精度问题。在此基础上,运用等刚度代换法,提出了截面削弱在墙或柱不同水平位置所对应的稳定系数计算方法,并通过算例演示了其在工程中的应用。

关键词：墙(柱)身截面削弱临界压力稳定系数近似公式稳定性加固

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不同温度下泡沫灭火剂对消防设备金属的腐蚀研究

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消防科学与技术 2024年第1期43卷 113-119页

作者：蒋凯孔得朋王东升中国石油大学机电工程学院山东青岛266580

为探究不同温度下泡沫灭火剂对消防设备金属的腐蚀行为,选用了水成膜泡沫灭火剂(AFFF)、合成型泡沫灭火剂(S)、氟蛋白泡沫灭火剂(FP)这3种消防工作中常用的泡沫灭火剂和2种消防设备金属材料(镀锌钢、铝合金),在40~80℃下开展了浸泡失重... 详细信息

为探究不同温度下泡沫灭火剂对消防设备金属的腐蚀行为,选用了水成膜泡沫灭火剂(AFFF)、合成型泡沫灭火剂(S)、氟蛋白泡沫灭火剂(FP)这3种消防工作中常用的泡沫灭火剂和2种消防设备金属材料(镀锌钢、铝合金),在40~80℃下开展了浸泡失重和电化学测试试验,并计算了腐蚀速率,测量了腐蚀电流密度等关键参数。结果表明:金属腐蚀速率随温度升高而增大,3种泡沫灭火剂对2种金属的腐蚀速率依次为:FP>S>AFFF,2种金属的耐蚀性为:铝合金>镀锌钢。随着温度的升高,2种金属的腐蚀程度有所加剧,镀锌钢表面产生腐蚀产物与点蚀坑,铝合金表面颜色变暗,在FP中,两种金属表面均产生点蚀坑,其数量和深度随温度升高而增加。电化学测试发现,在腐蚀初期,随着温度升高,腐蚀电流密度上升,电容弧径和电荷转移电阻减小,腐蚀加快。此外,在不同温度下,铝合金在3种泡沫液中以及镀锌钢在AFFF和FP中的腐蚀机制都处于电荷转移控制之下,但镀锌钢在S中表现为典型的扩散控制。

关键词：泡沫灭火剂消防设备腐蚀研究电化学

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