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LPR调整频率、货币政策效率与社会福利损益
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作者 刘宗明 《统计研究》 CSSCI 北大核心 2024年第10期49-62,共14页
基于对我国近年来贷款市场报价利率(LPR)调整频率的观察,本文首先估计了贷款市场报价利率的调整周期,揭示了调整频率的基本事实;然后创新性提出并构建了一个包含贷款市场报价利率调整频率和货币政策的动态一般均衡模型,讨论了调整频率... 基于对我国近年来贷款市场报价利率(LPR)调整频率的观察,本文首先估计了贷款市场报价利率的调整周期,揭示了调整频率的基本事实;然后创新性提出并构建了一个包含贷款市场报价利率调整频率和货币政策的动态一般均衡模型,讨论了调整频率对于货币政策实施效果的影响,以及在供给和需求两侧受阻冲击下不同贷款市场报价粘性导致的宏观经济动态和政企违约风险特征;最后从经济波动和社会福利成本层面分析贷款市场报价频率的理论含义。研究发现,提高贷款市场报价利率调整频率会增进货币政策实施的效率,改善企业违约风险。当经济遭遇供给侧冲击时,较高的调整频率会放大生产率负面冲击的经济衰退效应,并产生更高的企业违约风险;然而当经济遭遇需求侧冲击时,较高的调整频率却会带来信贷利率更大的降幅,从而对宏观经济衰退形成良好缓冲,体现贷款市场报价利率的调整频率对宏观经济影响的状态依赖性。社会福利成本分析发现,贷款报价利率的调整频率对社会福利的影响存在类似特征。当面对供给不确定环境时,提高调整频率会带来社会福利损失;而当面对需求不确定性时,提高调整频率却会带来显著的社会福利改善。研究结论为调整贷款市场报价利率的时机和频率提供了理论基础。 展开更多
关键词 lpr调整频率 货币政策 经济波动 违约风险
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LPR改革缓解了企业融资难吗?——基于企业风险承担水平的准自然实验 被引量:1
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作者 徐明文 刘义圣 《经济问题》 CSSCI 北大核心 2024年第3期45-52,共8页
利率市场化是金融供给侧结构性改革的核心内容之一。贷款市场报价利率(LPR)已经成为金融机构贷款利率定价之“锚”,直接影响着各类经营主体的融资成本。对2017—2022年沪深A股上市企业的面板数据展开研究,通过构建双重差分模型,考察LPR... 利率市场化是金融供给侧结构性改革的核心内容之一。贷款市场报价利率(LPR)已经成为金融机构贷款利率定价之“锚”,直接影响着各类经营主体的融资成本。对2017—2022年沪深A股上市企业的面板数据展开研究,通过构建双重差分模型,考察LPR改革对企业融资的影响。研究发现,LPR改革显著增加了低风险承担水平企业的融资规模,主要增加低风险承担水平企业的短期借款与长期借款;对样本进行机制分析发现:LPR改革通过缓解企业融资约束促进企业的短期借款与长期借款规模,同时银企信息对称性在LPR改革与企业长期借款中起到中介作用,在LPR改革与企业短期借款中起到遮掩作用。因此,加大对高风险承担水平企业的融资力度、优化长期贷款机制、发展多元融资渠道以及建立银企信息互通机制是改善企业融资的有效改革举措。 展开更多
关键词 贷款市场报价利率 融资约束 风险承担水平
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Workout Action Recognition in Video Streams Using an Attention Driven Residual DC-GRU Network 被引量:1
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作者 Arnab Dey Samit Biswas Dac-Nhuong Le 《Computers, Materials & Continua》 SCIE EI 2024年第5期3067-3087,共21页
Regular exercise is a crucial aspect of daily life, as it enables individuals to stay physically active, lowers thelikelihood of developing illnesses, and enhances life expectancy. The recognition of workout actions i... Regular exercise is a crucial aspect of daily life, as it enables individuals to stay physically active, lowers thelikelihood of developing illnesses, and enhances life expectancy. The recognition of workout actions in videostreams holds significant importance in computer vision research, as it aims to enhance exercise adherence, enableinstant recognition, advance fitness tracking technologies, and optimize fitness routines. However, existing actiondatasets often lack diversity and specificity for workout actions, hindering the development of accurate recognitionmodels. To address this gap, the Workout Action Video dataset (WAVd) has been introduced as a significantcontribution. WAVd comprises a diverse collection of labeled workout action videos, meticulously curated toencompass various exercises performed by numerous individuals in different settings. This research proposes aninnovative framework based on the Attention driven Residual Deep Convolutional-Gated Recurrent Unit (ResDCGRU)network for workout action recognition in video streams. Unlike image-based action recognition, videoscontain spatio-temporal information, making the task more complex and challenging. While substantial progresshas been made in this area, challenges persist in detecting subtle and complex actions, handling occlusions,and managing the computational demands of deep learning approaches. The proposed ResDC-GRU Attentionmodel demonstrated exceptional classification performance with 95.81% accuracy in classifying workout actionvideos and also outperformed various state-of-the-art models. The method also yielded 81.6%, 97.2%, 95.6%, and93.2% accuracy on established benchmark datasets, namely HMDB51, Youtube Actions, UCF50, and UCF101,respectively, showcasing its superiority and robustness in action recognition. The findings suggest practicalimplications in real-world scenarios where precise video action recognition is paramount, addressing the persistingchallenges in the field. TheWAVd dataset serves as a catalyst for the development ofmore robust and effective fitnesstracking systems and ultimately promotes healthier lifestyles through improved exercise monitoring and analysis. 展开更多
关键词 Workout action recognition video stream action recognition residual network GRU ATTENTION
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利率市场化背景下LPR改革的宏观经济效应
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作者 徐明文 刘义圣 《江汉论坛》 CSSCI 北大核心 2024年第4期30-38,共9页
利率市场化是金融供给侧结构性改革的核心内容之一,必须始终坚持发挥市场在利率形成中的决定性作用。LPR机制的形成为疏通货币政策传导机制、丰富报价内容与方式、推进利率市场化改革迈出了重要一步。基于TVP-VAR模型,采用2013年10月至2... 利率市场化是金融供给侧结构性改革的核心内容之一,必须始终坚持发挥市场在利率形成中的决定性作用。LPR机制的形成为疏通货币政策传导机制、丰富报价内容与方式、推进利率市场化改革迈出了重要一步。基于TVP-VAR模型,采用2013年10月至2022年12月的月度数据,分别绘制LPR、M2与物价水平、经济增长的不同提前期脉冲响应函数图和时点脉冲响应函数图,利于分阶段探讨LPR、M2的价格效应与经济增长效应的特征。研究结果表明,随着利率市场化的推进,M2对经济增长的逆周期调节作用逐渐减弱,对物价水平的调节作用较显著,LPR对经济增长和物价水平的逆周期调节效果均显著,但同时两者的逆周期调节效果都受到宏观经济波动与利率市场化程度的影响。因此,应根据政策目标选择货币工具,提高LPR市场化程度,加强LPR与财政政策的协调及建立完善的风险管理机制。 展开更多
关键词 lpr改革 货币政策传导机制 利率市场化 利率政策
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Intelligent Recognition Using Ultralight Multifunctional Nano‑Layered Carbon Aerogel Sensors with Human‑Like Tactile Perception 被引量:1
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作者 Huiqi Zhao Yizheng Zhang +8 位作者 Lei Han Weiqi Qian Jiabin Wang Heting Wu Jingchen Li Yuan Dai Zhengyou Zhang Chris RBowen Ya Yang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第1期172-186,共15页
Humans can perceive our complex world through multi-sensory fusion.Under limited visual conditions,people can sense a variety of tactile signals to identify objects accurately and rapidly.However,replicating this uniq... Humans can perceive our complex world through multi-sensory fusion.Under limited visual conditions,people can sense a variety of tactile signals to identify objects accurately and rapidly.However,replicating this unique capability in robots remains a significant challenge.Here,we present a new form of ultralight multifunctional tactile nano-layered carbon aerogel sensor that provides pressure,temperature,material recognition and 3D location capabilities,which is combined with multimodal supervised learning algorithms for object recognition.The sensor exhibits human-like pressure(0.04–100 kPa)and temperature(21.5–66.2℃)detection,millisecond response times(11 ms),a pressure sensitivity of 92.22 kPa^(−1)and triboelectric durability of over 6000 cycles.The devised algorithm has universality and can accommodate a range of application scenarios.The tactile system can identify common foods in a kitchen scene with 94.63%accuracy and explore the topographic and geomorphic features of a Mars scene with 100%accuracy.This sensing approach empowers robots with versatile tactile perception to advance future society toward heightened sensing,recognition and intelligence. 展开更多
关键词 Multifunctional sensor Tactile perception Multimodal machine learning algorithms Universal tactile system Intelligent object recognition
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LPR机制改革对我国城商行风险承担的影响研究
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作者 聂正一 段非凡 潘长春 《中国管理信息化》 2024年第17期136-140,共5页
本文以2013—2022年80家城市商业银行为样本,分析LPR(贷款市场报价利率)机制改革对我国城商行风险承担的影响。研究发现,LPR机制改革会提高我国城商行的风险承担;LPR机制改革对处于西部经济带的城商行风险承担的影响最为激烈,其次是中部... 本文以2013—2022年80家城市商业银行为样本,分析LPR(贷款市场报价利率)机制改革对我国城商行风险承担的影响。研究发现,LPR机制改革会提高我国城商行的风险承担;LPR机制改革对处于西部经济带的城商行风险承担的影响最为激烈,其次是中部,最后是东部;LPR机制改革对非上市城商行风险承担的影响效果高于上市城商行;LPR机制改革会通过“盈利”和“信贷”两渠道提高我国城商行的风险承担。本研究有助于城商行提高自身风险防范和管控能力,在利率市场化快速发展的进程中实现持续稳健发展。 展开更多
关键词 lpr机制改革 利率市场化 城商行 风险承担 双向固定效应
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Coupling Analysis of Multiple Machine Learning Models for Human Activity Recognition 被引量:1
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作者 Yi-Chun Lai Shu-Yin Chiang +1 位作者 Yao-Chiang Kan Hsueh-Chun Lin 《Computers, Materials & Continua》 SCIE EI 2024年第6期3783-3803,共21页
Artificial intelligence(AI)technology has become integral in the realm of medicine and healthcare,particularly in human activity recognition(HAR)applications such as fitness and rehabilitation tracking.This study intr... Artificial intelligence(AI)technology has become integral in the realm of medicine and healthcare,particularly in human activity recognition(HAR)applications such as fitness and rehabilitation tracking.This study introduces a robust coupling analysis framework that integrates four AI-enabled models,combining both machine learning(ML)and deep learning(DL)approaches to evaluate their effectiveness in HAR.The analytical dataset comprises 561 features sourced from the UCI-HAR database,forming the foundation for training the models.Additionally,the MHEALTH database is employed to replicate the modeling process for comparative purposes,while inclusion of the WISDM database,renowned for its challenging features,supports the framework’s resilience and adaptability.The ML-based models employ the methodologies including adaptive neuro-fuzzy inference system(ANFIS),support vector machine(SVM),and random forest(RF),for data training.In contrast,a DL-based model utilizes one-dimensional convolution neural network(1dCNN)to automate feature extraction.Furthermore,the recursive feature elimination(RFE)algorithm,which drives an ML-based estimator to eliminate low-participation features,helps identify the optimal features for enhancing model performance.The best accuracies of the ANFIS,SVM,RF,and 1dCNN models with meticulous featuring process achieve around 90%,96%,91%,and 93%,respectively.Comparative analysis using the MHEALTH dataset showcases the 1dCNN model’s remarkable perfect accuracy(100%),while the RF,SVM,and ANFIS models equipped with selected features achieve accuracies of 99.8%,99.7%,and 96.5%,respectively.Finally,when applied to the WISDM dataset,the DL-based and ML-based models attain accuracies of 91.4%and 87.3%,respectively,aligning with prior research findings.In conclusion,the proposed framework yields HAR models with commendable performance metrics,exhibiting its suitability for integration into the healthcare services system through AI-driven applications. 展开更多
关键词 Human activity recognition artificial intelligence support vector machine random forest adaptive neuro-fuzzy inference system convolution neural network recursive feature elimination
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Automatic modulation recognition of radio fuzes using a DR2D-based adaptive denoising method and textural feature extraction 被引量:1
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作者 Yangtian Liu Xiaopeng Yan +2 位作者 Qiang Liu Tai An Jian Dai 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第4期328-338,共11页
The identification of intercepted radio fuze modulation types is a prerequisite for decision-making in interference systems.However,the electromagnetic environment of modern battlefields is complex,and the signal-to-n... The identification of intercepted radio fuze modulation types is a prerequisite for decision-making in interference systems.However,the electromagnetic environment of modern battlefields is complex,and the signal-to-noise ratio(SNR)of such environments is usually low,which makes it difficult to implement accurate recognition of radio fuzes.To solve the above problem,a radio fuze automatic modulation recognition(AMR)method for low-SNR environments is proposed.First,an adaptive denoising algorithm based on data rearrangement and the two-dimensional(2D)fast Fourier transform(FFT)(DR2D)is used to reduce the noise of the intercepted radio fuze intermediate frequency(IF)signal.Then,the textural features of the denoised IF signal rearranged data matrix are extracted from the statistical indicator vectors of gray-level cooccurrence matrices(GLCMs),and support vector machines(SVMs)are used for classification.The DR2D-based adaptive denoising algorithm achieves an average correlation coefficient of more than 0.76 for ten fuze types under SNRs of-10 d B and above,which is higher than that of other typical algorithms.The trained SVM classification model achieves an average recognition accuracy of more than 96%on seven modulation types and recognition accuracies of more than 94%on each modulation type under SNRs of-12 d B and above,which represents a good AMR performance of radio fuzes under low SNRs. 展开更多
关键词 Automatic modulation recognition Adaptive denoising Data rearrangement and the 2D FFT(DR2D) Radio fuze
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Robust Human Interaction Recognition Using Extended Kalman Filter
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作者 Tanvir Fatima Naik Bukht Abdulwahab Alazeb +4 位作者 Naif Al Mudawi Bayan Alabdullah Khaled Alnowaiser Ahmad Jalal Hui Liu 《Computers, Materials & Continua》 SCIE EI 2024年第11期2987-3002,共16页
In the field of computer vision and pattern recognition,knowledge based on images of human activity has gained popularity as a research topic.Activity recognition is the process of determining human behavior based on ... In the field of computer vision and pattern recognition,knowledge based on images of human activity has gained popularity as a research topic.Activity recognition is the process of determining human behavior based on an image.We implemented an Extended Kalman filter to create an activity recognition system here.The proposed method applies an HSI color transformation in its initial stages to improve the clarity of the frame of the image.To minimize noise,we use Gaussian filters.Extraction of silhouette using the statistical method.We use Binary Robust Invariant Scalable Keypoints(BRISK)and SIFT for feature extraction.The next step is to perform feature discrimination using Gray Wolf.After that,the features are input into the Extended Kalman filter and classified into relevant human activities according to their definitive characteristics.The experimental procedure uses the SUB-Interaction and HMDB51 datasets to a 0.88%and 0.86%recognition rate. 展开更多
关键词 Pattern recognition geometric features activity recognition full-body texture
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Fine-Grained Ship Recognition Based on Visible and Near-Infrared Multimodal Remote Sensing Images: Dataset,Methodology and Evaluation
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作者 Shiwen Song Rui Zhang +1 位作者 Min Hu Feiyao Huang 《Computers, Materials & Continua》 SCIE EI 2024年第6期5243-5271,共29页
Fine-grained recognition of ships based on remote sensing images is crucial to safeguarding maritime rights and interests and maintaining national security.Currently,with the emergence of massive high-resolution multi... Fine-grained recognition of ships based on remote sensing images is crucial to safeguarding maritime rights and interests and maintaining national security.Currently,with the emergence of massive high-resolution multi-modality images,the use of multi-modality images for fine-grained recognition has become a promising technology.Fine-grained recognition of multi-modality images imposes higher requirements on the dataset samples.The key to the problem is how to extract and fuse the complementary features of multi-modality images to obtain more discriminative fusion features.The attention mechanism helps the model to pinpoint the key information in the image,resulting in a significant improvement in the model’s performance.In this paper,a dataset for fine-grained recognition of ships based on visible and near-infrared multi-modality remote sensing images has been proposed first,named Dataset for Multimodal Fine-grained Recognition of Ships(DMFGRS).It includes 1,635 pairs of visible and near-infrared remote sensing images divided into 20 categories,collated from digital orthophotos model provided by commercial remote sensing satellites.DMFGRS provides two types of annotation format files,as well as segmentation mask images corresponding to the ship targets.Then,a Multimodal Information Cross-Enhancement Network(MICE-Net)fusing features of visible and near-infrared remote sensing images,has been proposed.In the network,a dual-branch feature extraction and fusion module has been designed to obtain more expressive features.The Feature Cross Enhancement Module(FCEM)achieves the fusion enhancement of the two modal features by making the channel attention and spatial attention work cross-functionally on the feature map.A benchmark is established by evaluating state-of-the-art object recognition algorithms on DMFGRS.MICE-Net conducted experiments on DMFGRS,and the precision,recall,mAP0.5 and mAP0.5:0.95 reached 87%,77.1%,83.8%and 63.9%,respectively.Extensive experiments demonstrate that the proposed MICE-Net has more excellent performance on DMFGRS.Built on lightweight network YOLO,the model has excellent generalizability,and thus has good potential for application in real-life scenarios. 展开更多
关键词 Multi-modality dataset ship recognition fine-grained recognition attention mechanism
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Spatial Distribution Feature Extraction Network for Open Set Recognition of Electromagnetic Signal
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作者 Hui Zhang Huaji Zhou +1 位作者 Li Wang Feng Zhou 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第4期279-296,共18页
This paper proposes a novel open set recognition method,the Spatial Distribution Feature Extraction Network(SDFEN),to address the problem of electromagnetic signal recognition in an open environment.The spatial distri... This paper proposes a novel open set recognition method,the Spatial Distribution Feature Extraction Network(SDFEN),to address the problem of electromagnetic signal recognition in an open environment.The spatial distribution feature extraction layer in SDFEN replaces convolutional output neural networks with the spatial distribution features that focus more on inter-sample information by incorporating class center vectors.The designed hybrid loss function considers both intra-class distance and inter-class distance,thereby enhancing the similarity among samples of the same class and increasing the dissimilarity between samples of different classes during training.Consequently,this method allows unknown classes to occupy a larger space in the feature space.This reduces the possibility of overlap with known class samples and makes the boundaries between known and unknown samples more distinct.Additionally,the feature comparator threshold can be used to reject unknown samples.For signal open set recognition,seven methods,including the proposed method,are applied to two kinds of electromagnetic signal data:modulation signal and real-world emitter.The experimental results demonstrate that the proposed method outperforms the other six methods overall in a simulated open environment.Specifically,compared to the state-of-the-art Openmax method,the novel method achieves up to 8.87%and 5.25%higher micro-F-measures,respectively. 展开更多
关键词 Electromagnetic signal recognition deep learning feature extraction open set recognition
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Recent Advances on Deep Learning for Sign Language Recognition
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作者 Yanqiong Zhang Xianwei Jiang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第6期2399-2450,共52页
Sign language,a visual-gestural language used by the deaf and hard-of-hearing community,plays a crucial role in facilitating communication and promoting inclusivity.Sign language recognition(SLR),the process of automa... Sign language,a visual-gestural language used by the deaf and hard-of-hearing community,plays a crucial role in facilitating communication and promoting inclusivity.Sign language recognition(SLR),the process of automatically recognizing and interpreting sign language gestures,has gained significant attention in recent years due to its potential to bridge the communication gap between the hearing impaired and the hearing world.The emergence and continuous development of deep learning techniques have provided inspiration and momentum for advancing SLR.This paper presents a comprehensive and up-to-date analysis of the advancements,challenges,and opportunities in deep learning-based sign language recognition,focusing on the past five years of research.We explore various aspects of SLR,including sign data acquisition technologies,sign language datasets,evaluation methods,and different types of neural networks.Convolutional Neural Networks(CNN)and Recurrent Neural Networks(RNN)have shown promising results in fingerspelling and isolated sign recognition.However,the continuous nature of sign language poses challenges,leading to the exploration of advanced neural network models such as the Transformer model for continuous sign language recognition(CSLR).Despite significant advancements,several challenges remain in the field of SLR.These challenges include expanding sign language datasets,achieving user independence in recognition systems,exploring different input modalities,effectively fusing features,modeling co-articulation,and improving semantic and syntactic understanding.Additionally,developing lightweight network architectures for mobile applications is crucial for practical implementation.By addressing these challenges,we can further advance the field of deep learning for sign language recognition and improve communication for the hearing-impaired community. 展开更多
关键词 Sign language recognition deep learning artificial intelligence computer vision gesture recognition
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Deep Learning Approach for Hand Gesture Recognition:Applications in Deaf Communication and Healthcare
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作者 Khursheed Aurangzeb Khalid Javeed +3 位作者 Musaed Alhussein Imad Rida Syed Irtaza Haider Anubha Parashar 《Computers, Materials & Continua》 SCIE EI 2024年第1期127-144,共18页
Hand gestures have been used as a significant mode of communication since the advent of human civilization.By facilitating human-computer interaction(HCI),hand gesture recognition(HGRoc)technology is crucial for seaml... Hand gestures have been used as a significant mode of communication since the advent of human civilization.By facilitating human-computer interaction(HCI),hand gesture recognition(HGRoc)technology is crucial for seamless and error-free HCI.HGRoc technology is pivotal in healthcare and communication for the deaf community.Despite significant advancements in computer vision-based gesture recognition for language understanding,two considerable challenges persist in this field:(a)limited and common gestures are considered,(b)processing multiple channels of information across a network takes huge computational time during discriminative feature extraction.Therefore,a novel hand vision-based convolutional neural network(CNN)model named(HVCNNM)offers several benefits,notably enhanced accuracy,robustness to variations,real-time performance,reduced channels,and scalability.Additionally,these models can be optimized for real-time performance,learn from large amounts of data,and are scalable to handle complex recognition tasks for efficient human-computer interaction.The proposed model was evaluated on two challenging datasets,namely the Massey University Dataset(MUD)and the American Sign Language(ASL)Alphabet Dataset(ASLAD).On the MUD and ASLAD datasets,HVCNNM achieved a score of 99.23% and 99.00%,respectively.These results demonstrate the effectiveness of CNN as a promising HGRoc approach.The findings suggest that the proposed model have potential roles in applications such as sign language recognition,human-computer interaction,and robotics. 展开更多
关键词 Computer vision deep learning gait recognition sign language recognition machine learning
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Attention Guided Food Recognition via Multi-Stage Local Feature Fusion
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作者 Gonghui Deng Dunzhi Wu Weizhen Chen 《Computers, Materials & Continua》 SCIE EI 2024年第8期1985-2003,共19页
The task of food image recognition,a nuanced subset of fine-grained image recognition,grapples with substantial intra-class variation and minimal inter-class differences.These challenges are compounded by the irregula... The task of food image recognition,a nuanced subset of fine-grained image recognition,grapples with substantial intra-class variation and minimal inter-class differences.These challenges are compounded by the irregular and multi-scale nature of food images.Addressing these complexities,our study introduces an advanced model that leverages multiple attention mechanisms and multi-stage local fusion,grounded in the ConvNeXt architecture.Our model employs hybrid attention(HA)mechanisms to pinpoint critical discriminative regions within images,substantially mitigating the influence of background noise.Furthermore,it introduces a multi-stage local fusion(MSLF)module,fostering long-distance dependencies between feature maps at varying stages.This approach facilitates the assimilation of complementary features across scales,significantly bolstering the model’s capacity for feature extraction.Furthermore,we constructed a dataset named Roushi60,which consists of 60 different categories of common meat dishes.Empirical evaluation of the ETH Food-101,ChineseFoodNet,and Roushi60 datasets reveals that our model achieves recognition accuracies of 91.12%,82.86%,and 92.50%,respectively.These figures not only mark an improvement of 1.04%,3.42%,and 1.36%over the foundational ConvNeXt network but also surpass the performance of most contemporary food image recognition methods.Such advancements underscore the efficacy of our proposed model in navigating the intricate landscape of food image recognition,setting a new benchmark for the field. 展开更多
关键词 Fine-grained image recognition food image recognition attention mechanism local feature fusion
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贷款市场报价利率(LPR)对企业投资决策的影响探究
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作者 张比亚 《中国商论》 2024年第3期105-110,共6页
本文深度剖析了贷款市场报价利率(LPR)的形成背景及其深远意义,详细解释了贷款市场报价利率(LPR)的概念,并分析了其在宏观经济、企业微观层面以及创新领域的深远影响,探讨了贷款市场报价利率(LPR)的变动与企业的投资决策之间的紧密联系... 本文深度剖析了贷款市场报价利率(LPR)的形成背景及其深远意义,详细解释了贷款市场报价利率(LPR)的概念,并分析了其在宏观经济、企业微观层面以及创新领域的深远影响,探讨了贷款市场报价利率(LPR)的变动与企业的投资决策之间的紧密联系。本文运用投资决策理论框架,结合实际案例,采用定量和定性研究方法,从宏观经济、企业微观层面以及LPR调整机制等多个角度,深入挖掘了贷款市场报价利率(LPR)对企业投资决策的潜在影响,并提出了一系列企业应对贷款市场报价利率(LPR)调整变化的策略。本文研究的成果不仅丰富了贷款市场报价利率(LPR)的理论研究体系,还为企业在实际操作中的决策提供了有益的参考和借鉴。 展开更多
关键词 市场报价利率 贷款基准利率 企业投资决策 lpr的影响 贷款市场
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Abnormal Action Recognition with Lightweight Pose Estimation Network in Electric Power Training Scene
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作者 Yunfeng Cai Ran Qin +3 位作者 Jin Tang Long Zhang Xiaotian Bi Qing Yang 《Computers, Materials & Continua》 SCIE EI 2024年第6期4979-4994,共16页
Electric power training is essential for ensuring the safety and reliability of the system.In this study,we introduce a novel Abnormal Action Recognition(AAR)system that utilizes a Lightweight Pose Estimation Network(... Electric power training is essential for ensuring the safety and reliability of the system.In this study,we introduce a novel Abnormal Action Recognition(AAR)system that utilizes a Lightweight Pose Estimation Network(LPEN)to efficiently and effectively detect abnormal fall-down and trespass incidents in electric power training scenarios.The LPEN network,comprising three stages—MobileNet,Initial Stage,and Refinement Stage—is employed to swiftly extract image features,detect human key points,and refine them for accurate analysis.Subsequently,a Pose-aware Action Analysis Module(PAAM)captures the positional coordinates of human skeletal points in each frame.Finally,an Abnormal Action Inference Module(AAIM)evaluates whether abnormal fall-down or unauthorized trespass behavior is occurring.For fall-down recognition,three criteria—falling speed,main angles of skeletal points,and the person’s bounding box—are considered.To identify unauthorized trespass,emphasis is placed on the position of the ankles.Extensive experiments validate the effectiveness and efficiency of the proposed system in ensuring the safety and reliability of electric power training. 展开更多
关键词 Abnormal action recognition action recognition lightweight pose estimation electric power training
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KurdSet: A Kurdish Handwritten Characters Recognition Dataset Using Convolutional Neural Network
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作者 Sardar Hasen Ali Maiwan Bahjat Abdulrazzaq 《Computers, Materials & Continua》 SCIE EI 2024年第4期429-448,共20页
Handwritten character recognition(HCR)involves identifying characters in images,documents,and various sources such as forms surveys,questionnaires,and signatures,and transforming them into a machine-readable format fo... Handwritten character recognition(HCR)involves identifying characters in images,documents,and various sources such as forms surveys,questionnaires,and signatures,and transforming them into a machine-readable format for subsequent processing.Successfully recognizing complex and intricately shaped handwritten characters remains a significant obstacle.The use of convolutional neural network(CNN)in recent developments has notably advanced HCR,leveraging the ability to extract discriminative features from extensive sets of raw data.Because of the absence of pre-existing datasets in the Kurdish language,we created a Kurdish handwritten dataset called(KurdSet).The dataset consists of Kurdish characters,digits,texts,and symbols.The dataset consists of 1560 participants and contains 45,240 characters.In this study,we chose characters only from our dataset.We utilized a Kurdish dataset for handwritten character recognition.The study also utilizes various models,including InceptionV3,Xception,DenseNet121,and a customCNNmodel.To show the performance of the KurdSet dataset,we compared it to Arabic handwritten character recognition dataset(AHCD).We applied the models to both datasets to show the performance of our dataset.Additionally,the performance of the models is evaluated using test accuracy,which measures the percentage of correctly classified characters in the evaluation phase.All models performed well in the training phase,DenseNet121 exhibited the highest accuracy among the models,achieving a high accuracy of 99.80%on the Kurdish dataset.And Xception model achieved 98.66%using the Arabic dataset. 展开更多
关键词 CNN models Kurdish handwritten recognition KurdSet dataset Arabic handwritten recognition DenseNet121 model InceptionV3 model Xception model
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An Approach for Human Posture Recognition Based on the Fusion PSE-CNN-BiGRU Model
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作者 Xianghong Cao Xinyu Wang +2 位作者 Xin Geng Donghui Wu Houru An 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第7期385-408,共24页
This study proposes a pose estimation-convolutional neural network-bidirectional gated recurrent unit(PSECNN-BiGRU)fusion model for human posture recognition to address low accuracy issues in abnormal posture recognit... This study proposes a pose estimation-convolutional neural network-bidirectional gated recurrent unit(PSECNN-BiGRU)fusion model for human posture recognition to address low accuracy issues in abnormal posture recognition due to the loss of some feature information and the deterioration of comprehensive performance in model detection in complex home environments.Firstly,the deep convolutional network is integrated with the Mediapipe framework to extract high-precision,multi-dimensional information from the key points of the human skeleton,thereby obtaining a human posture feature set.Thereafter,a double-layer BiGRU algorithm is utilized to extract multi-layer,bidirectional temporal features from the human posture feature set,and a CNN network with an exponential linear unit(ELU)activation function is adopted to perform deep convolution of the feature map to extract the spatial feature of the human posture.Furthermore,a squeeze and excitation networks(SENet)module is introduced to adaptively learn the importance weights of each channel,enhancing the network’s focus on important features.Finally,comparative experiments are performed on available datasets,including the public human activity recognition using smartphone dataset(UCIHAR),the public human activity recognition 70 plus dataset(HAR70PLUS),and the independently developed home abnormal behavior recognition dataset(HABRD)created by the authors’team.The results show that the average accuracy of the proposed PSE-CNN-BiGRU fusion model for human posture recognition is 99.56%,89.42%,and 98.90%,respectively,which are 5.24%,5.83%,and 3.19%higher than the average accuracy of the five models proposed in the comparative literature,including CNN,GRU,and others.The F1-score for abnormal posture recognition reaches 98.84%(heartache),97.18%(fall),99.6%(bellyache),and 98.27%(climbing)on the self-builtHABRDdataset,thus verifying the effectiveness,generalization,and robustness of the proposed model in enhancing human posture recognition. 展开更多
关键词 Posture recognition mediapipe BiGRU CNN ELU ATTENTION
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TransTM:A device-free method based on time-streaming multiscale transformer for human activity recognition
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作者 Yi Liu Weiqing Huang +4 位作者 Shang Jiang Bobai Zhao Shuai Wang Siye Wang Yanfang Zhang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第2期619-628,共10页
RFID-based human activity recognition(HAR)attracts attention due to its convenience,noninvasiveness,and privacy protection.Existing RFID-based HAR methods use modeling,CNN,or LSTM to extract features effectively.Still... RFID-based human activity recognition(HAR)attracts attention due to its convenience,noninvasiveness,and privacy protection.Existing RFID-based HAR methods use modeling,CNN,or LSTM to extract features effectively.Still,they have shortcomings:1)requiring complex hand-crafted data cleaning processes and 2)only addressing single-person activity recognition based on specific RF signals.To solve these problems,this paper proposes a novel device-free method based on Time-streaming Multiscale Transformer called TransTM.This model leverages the Transformer's powerful data fitting capabilities to take raw RFID RSSI data as input without pre-processing.Concretely,we propose a multiscale convolutional hybrid Transformer to capture behavioral features that recognizes singlehuman activities and human-to-human interactions.Compared with existing CNN-and LSTM-based methods,the Transformer-based method has more data fitting power,generalization,and scalability.Furthermore,using RF signals,our method achieves an excellent classification effect on human behaviorbased classification tasks.Experimental results on the actual RFID datasets show that this model achieves a high average recognition accuracy(99.1%).The dataset we collected for detecting RFID-based indoor human activities will be published. 展开更多
关键词 Human activity recognition RFID TRANSFORMER
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CapsNet-FR: Capsule Networks for Improved Recognition of Facial Features
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作者 Mahmood Ul Haq Muhammad Athar Javed Sethi +3 位作者 Najib Ben Aoun Ala Saleh Alluhaidan Sadique Ahmad Zahid farid 《Computers, Materials & Continua》 SCIE EI 2024年第5期2169-2186,共18页
Face recognition (FR) technology has numerous applications in artificial intelligence including biometrics, security,authentication, law enforcement, and surveillance. Deep learning (DL) models, notably convolutional ... Face recognition (FR) technology has numerous applications in artificial intelligence including biometrics, security,authentication, law enforcement, and surveillance. Deep learning (DL) models, notably convolutional neuralnetworks (CNNs), have shown promising results in the field of FR. However CNNs are easily fooled since theydo not encode position and orientation correlations between features. Hinton et al. envisioned Capsule Networksas a more robust design capable of retaining pose information and spatial correlations to recognize objects morelike the brain does. Lower-level capsules hold 8-dimensional vectors of attributes like position, hue, texture, andso on, which are routed to higher-level capsules via a new routing by agreement algorithm. This provides capsulenetworks with viewpoint invariance, which has previously evaded CNNs. This research presents a FR model basedon capsule networks that was tested using the LFW dataset, COMSATS face dataset, and own acquired photos usingcameras measuring 128 × 128 pixels, 40 × 40 pixels, and 30 × 30 pixels. The trained model outperforms state-ofthe-art algorithms, achieving 95.82% test accuracy and performing well on unseen faces that have been blurred orrotated. Additionally, the suggested model outperformed the recently released approaches on the COMSATS facedataset, achieving a high accuracy of 92.47%. Based on the results of this research as well as previous results, capsulenetworks perform better than deeper CNNs on unobserved altered data because of their special equivarianceproperties. 展开更多
关键词 CapsNet face recognition artificial intelligence
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