共查询到20条相似文献，搜索用时 187 毫秒
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【目的/意义】为重塑图书馆馆员职业的良好形象,挖掘公众对于图书馆职业认知,为图书馆职业招聘和运营管理提供参考。【方法/过程】基于深度学习方法,以知乎和搜狗问问中与图书馆馆员职业相关的问答与评论为数据样本,利用BERTopic主题模型提取公众对图书馆馆员的职业形象感知,并提出改进TextCNN的情感分类模型,分析公众对图书馆馆员职业形象感知的细粒度情感。【结果/结论】结果发现：公众对图书馆馆员职业形象感知包括职业发展与前景、工作内容、工资待遇、工作时间以及工作环境与位置5个主题维度;大部分公众对图书馆馆员职业形象的情感持正向看法;各主题维度下细粒度的情感形象与图书馆馆员整体形象占比基本趋同,但在不同维度上略有侧重。【创新/局限】将BERTopic主题和改进了TextCNN算法用于图书馆馆员职业形象文本主题提取和细粒度情感分析具有一定的创新性,但是未能够进行算法性能的比较与评估。未来可以进一步地开展深度学习算法性能评估和比较。 相似文献
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在对计算机算法与设计中的贪心算法、统计学中的相关系数理论、数据挖掘理论进行基本阐述之后,利用上述知识,将传统贪心算法进行了基于相关系数理论的拓展。随后,利用拓展的贪心算法对离散数据进行了分类、聚类处理。通过上述具有完全实践性的理论研究,为拓展传统的数据挖掘技术与方法,开辟了一片全新的领域。为在经济领域开展此类分析,提供了决策依据和决策工具。 相似文献
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由于基于互信息的图像配准方法具有自动化程度高、配准精度高等优点,本文利用这一优点,根据图像配准的基本步骤设计出一个基于互信息的多模态医学图像配准算法.首先是采用三线性插值方法对图像进行插值处理,然后利用Powell优化算法,根据互信息值来判断Powell算法所获得的参数是否是最优参数解.最后仿真实验证明了该算法的有效性. 相似文献
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一种基于密度最大值的聚类算法 总被引：1，自引：0，他引：1
提出了一种结合了基于密度聚类思想的划分聚类方法——"密度最大值聚类算法(MDCA)",以最大密度对象作为起始点,通过考察最大密度对象所处空间区域的密度分布情况来划分基本簇,并合并基本簇获得最终的簇划分.实验表明,MDCA能够自动确定簇数量,并有效发现任意形状的簇,对于未知数据集的处理能力和聚类准确度都优于传统的基于划分聚类算法. 相似文献
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对海量数据的处理能力是数据挖掘最关注的问题。决策树作为一种分类器,是数据挖掘中用到的一种基本方法之一。基于C4．5的决策树改进算法,是在一些典型的决策树分类算法的基础上提出的,基本思想是在建树过程中,用属性依赖度替代信息增益率来确定划分条件属性的顺序。该算法借鉴MedGen算法的阈值设定方法,在简化决策树剪枝和优化过程的同时,可优化C4．5算法中使用信息熵率的时间复杂度,避免了使用信息熵带来的不当划分。简述了该改进算法的执行过程,证明了算法的正确性。 相似文献
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普通计算机所能处理的数据的位数有限,为解决超出计算机系统基本数据类型表达能力的数据(大数)计算,特别是乘法计算问题,本文给出了一种基于大整数乘法的算法设计思想并利用C++语言进行了编程实现。通过该算法可以类推出大数(包括含小数位的大数)、超精确小数(即含多位小数位、精确度非常高的数据)的乘法运算。 相似文献
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[目的/意义]探索河南暴雨事件的网络舆情情感演化特征,为自然灾害事件网络舆情治理提供参考。[方法/过程]基于网络舆情发展中情感演化视角,构建了河南暴雨事件网络舆情处理分析模型,以微博舆情数据作为研究对象,采用SnowNLP、词云等方法揭示其情感特征和情感倾向。[结果/结论]网络舆情处理分析模型能够合理划分舆情演变阶段,发现舆情演变规律,为相关部门提供有针对性的引导策略及理论支撑。 相似文献
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【目的/意义】为推动深度学习在网络舆情管理中的应用,提高突发灾害事件网络舆情情感识别效率。【方 法/过程】基于OCC模型建立了突发自然灾害网络舆情情感规则,并由word2vec构建文本向量作为长短期记忆网 络（Long-short term memory,LSTM）的初始输入,对其训练得到突发灾害事件网络舆情多情感识别模型。【结果/结 论】通过对比试验发现,OCC情感规则能够提升情感识别模型的正确率,基于LSTM和word2vec的突发灾害事件 网络舆情情感识别模型在情感识别效果上优于TF-IDF文本向量化方法以及基于卷积神经网络（Convolutional neural network,CNN）和传统的机器学习方式（Support vector machine,SVM）的分类算法结果。 相似文献
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《Information processing & management》2022,59(3):102934
Compared with explicit sentiment analysis that attracts considerable attention, implicit sentiment analysis is a more difficult task due to the lack of sentimental words. The abundant information in an external sentimental knowledge base can play a significant complementary and expansion role. In this paper, a sentimental commonsense knowledge graph embedded multi-polarity orthogonal attention model is proposed to learn the implication of the implicit sentiment. We analyzed the effectiveness of different knowledge relations in the ConceptNet knowledge base in detail, and proposed a matching and filtering method to distill useful knowledge tuples for implicit sentiment analysis automatically. By introducing the sentimental information in the knowledge base, the proposed model can extend the semantic of a sentence with an implicit sentiment. Then, a bi-directional long–short term memory model with multi-polarity orthogonal attention is adopted to fuse the distilled sentimental knowledge with the semantic embedding, effectively enriching the representation of sentences. Experiments on the SMP2019-ECISA implicit sentiment dataset show that our model fully utilizes the information of the knowledge base and improves the performance of Chinese implicit sentiment analysis. 相似文献
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用户生成内容是Web2.0下由网络用户创作的互联网信息,分析其相关理论研究进展从而为UGC的进一步研究及商业利用提供思路具有重要的参考意义。本文在界定了UGC产生的背景基础上,从UGC基本范畴、生成动机、质量问题和法律问题4方面,分析了UGC研究动态;探究UGC情感分析中情感词语和情感量化问题,归纳现有情感分析涉及的算法应用。在研究现状分析基础上,指出下一步应重点研究促进网络用户生产出高质量UGC的激励和约束政策,建立更加完善、准确的推荐模型,设计符合不同应用领域的情感词量化方法,构建保护用户隐私的UGC生产、利用机制。 相似文献
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Asad Abdi Siti Mariyam Shamsuddin Ramiz M. Aliguliyev 《Information processing & management》2018,54(2):318-338
Sentiment analysis concerns the study of opinions expressed in a text. This paper presents the QMOS method, which employs a combination of sentiment analysis and summarization approaches. It is a lexicon-based method to query-based multi-documents summarization of opinion expressed in reviews.QMOS combines multiple sentiment dictionaries to improve word coverage limit of the individual lexicon. A major problem for a dictionary-based approach is the semantic gap between the prior polarity of a word presented by a lexicon and the word polarity in a specific context. This is due to the fact that, the polarity of a word depends on the context in which it is being used. Furthermore, the type of a sentence can also affect the performance of a sentiment analysis approach. Therefore, to tackle the aforementioned challenges, QMOS integrates multiple strategies to adjust word prior sentiment orientation while also considers the type of sentence. QMOS also employs the Semantic Sentiment Approach to determine the sentiment score of a word if it is not included in a sentiment lexicon.On the other hand, the most of the existing methods fail to distinguish the meaning of a review sentence and user's query when both of them share the similar bag-of-words; hence there is often a conflict between the extracted opinionated sentences and users’ needs. However, the summarization phase of QMOS is able to avoid extracting a review sentence whose similarity with the user's query is high but whose meaning is different. The method also employs the greedy algorithm and query expansion approach to reduce redundancy and bridge the lexical gaps for similar contexts that are expressed using different wording, respectively. Our experiment shows that the QMOS method can significantly improve the performance and make QMOS comparable to other existing methods. 相似文献
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《Information processing & management》2020,57(3):102211
Aspect-based sentiment analysis allows one to compute the sentiment for an aspect in a certain context. One problem in this analysis is that words possibly carry different sentiments for different aspects. Moreover, an aspect’s sentiment might be highly influenced by the domain-specific knowledge. In order to tackle these issues, in this paper, we propose a hybrid solution for sentence-level aspect-based sentiment analysis using A Lexicalized Domain Ontology and a Regularized Neural Attention model (ALDONAr). The bidirectional context attention mechanism is introduced to measure the influence of each word in a given sentence on an aspect’s sentiment value. The classification module is designed to handle the complex structure of a sentence. The manually created lexicalized domain ontology is integrated to utilize the field-specific knowledge. Compared to the existing ALDONA model, ALDONAr uses BERT word embeddings, regularization, the Adam optimizer, and different model initialization. Moreover, its classification module is enhanced with two 1D CNN layers providing superior results on standard datasets. 相似文献
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《Information processing & management》2022,59(1):102758
Advancements in recent networking and information technology have always been a natural phenomenon. The exponential amount of data generated by the people in their day-to-day lives results in the rise of Big Data Analytics (BDA). Cognitive computing is an Artificial Intelligence (AI) based system that can reduce the issues faced during BDA. On the other hand, Sentiment Analysis (SA) is employed to understand such linguistic based tweets, feature extraction, compute subjectivity and sentimental texts placed in these tweets. The application of SA on big data finds it useful for businesses to take commercial benefits insight from text-oriented content. In this view, this paper presents new cognitive computing with the big data analysis tool for SA. The proposed model involves various process such as pre-processing, feature extraction, feature selection and classification. For handling big data, Hadoop Map Reduce tool is used. The proposed model initially undergoes pre-processing to remove the unwanted words. Then, Term Frequency-Inverse Document Frequency (TF-IDF) is utilized as a feature extraction technique to extract the set of feature vectors. Besides, a Binary Brain Storm Optimization (BBSO) algorithm is being used for the Feature Selection (FS) process and thereby achieving improved classification performance. Moreover, Fuzzy Cognitive Maps (FCMs) are used as a classifier to classify the incidence of positive or negative sentiments. A comprehensive experimental results analysis ensures the better performance of the presented BBSO-FCM model on the benchmark dataset. The obtained experimental values highlights the improved classification performance of the proposed BBSO-FCM model in terms of different measures. 相似文献
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[目的/意义]近年来,科技文献资源呈爆炸性增长,海量科技文献中依旧存在大量非结构化摘要。非结构化摘要一方面不利于学者阅读与理解;另一方面不利于对摘要内部信息进行知识的自动化抽取和相应的检索。研究科技文献非结构化摘要的知识表示模型及其自动化抽取方法,对学者快速阅读和机器自动化处理具有重要意义。[方法/过程]文章在分析科技文献非结构化摘要结构的基础上,结合知识元本体理论,构建了一个面向科技文献非结构化摘要的知识元本体模型。通过分析非结构化摘要的写作特征,将文本按句子级划分为目的、方法、结果或结论三个要素,统计每个要素句中的线索词、句型和位置,建立相关规则库,根据本体模型和规则库构建相关抽取算法。最后,下载《计算机技术与发展》中的部分文献进行实验。[结果/结论]通过增加句型集和线索词集,完善了非结构化摘要的要素,构建了非结构化摘要知识元本体模型。实验结果表明,根据本文提出的模型能有效地对非结构化摘要中的知识元进行抽取。[局限]实验的不足之处是需要人工对摘要中的句型和线索词进行归纳总结。 相似文献
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[目的/意义]针对产品评论中的复合句式，实现特征观点对的语义匹配及提取，并明确评论可信度的识别因素及权重，对产品可信评论进行筛选和分析。[方法/过程]基于特征观点对的语义匹配算法实现评论语义指标的量化计算，并采用模糊层次分析法确定可信度指标权重。[结果/结论]实验表明相较于单句提取特征观点对方法，特征观点对的语义匹配算法在召回率、准确率和F-score等性能方面均有较大优势。依据可信度指标对网站产品评论进行筛选，不仅可以评估产品整体的评论可信度，还可以细化到产品特征级别的可信度分析，为用户筛选可信的评论信息并提升购物决策效率。 相似文献
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【目的/意义】少儿情感的发展规律一直是各方关注的问题,现有研究在长期、准确和高效地收集、处理、分析
情感数据上存在不足,本研究尝试采用自由叙事文本进行情感分析。【方法/过程】研究通过收集少儿从小学1年级
持续到6年级的自由叙事文本数据,使用文本情感分析对叙事文本情感状态进行判别,最后使用多项式回归来研究
情感发展的线性和非线性趋势。【结果/结论】结果表明,随着年级的增长,积极情感大体上呈现曲线下降趋势,消极
情感呈曲线上升趋势,中性情感在整个发展过程中呈正弦型。在整体情感趋势上,女童比男童更为积极。【创新/局
限】尽管存在学生本身能力限制、无法从文本中确定直接因果关系等局限,自由叙事文本情感分析依然为研究人员
提供了利用“大数据+AI”技术,来便捷、准确、高效探索少儿长时跨度情感发展规律的机会。 相似文献