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Layout graph model for semantic façade reconstruction using laser point clouds 认领 引用 被引量：4
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作者 Hongchao Fan Yuefeng Wang Jianya Gong 《Geo-Spatial Information Science》 SCIE EI CSCD 2021年第3期403-421,共19页
Building façades can feature different patterns depending on the architectural style,function-ality,and size of the buildings;therefore,reconstructing these façades can be complicated.In particular,when sema... Building façades can feature different patterns depending on the architectural style,function-ality,and size of the buildings;therefore,reconstructing these façades can be complicated.In particular,when semantic façades are reconstructed from point cloud data,uneven point density and noise make it difficult to accurately determine the façade structure.When inves-tigating façade layouts,Gestalt principles can be applied to cluster visually similar floors and façade elements,allowing for a more intuitive interpretation of façade structures.We propose a novel model for describing façade structures,namely the layout graph model,which involves a compound graph with two structure levels.In the proposed model,similar façade elements such as windows are first grouped into clusters.A down-layout graph is then formed using this cluster as a node and by combining intra-and inter-cluster spacings as the edges.Second,a top-layout graph is formed by clustering similar floors.By extracting relevant parameters from this model,we transform semantic façade reconstruction to an optimization strategy using simulated annealing coupled with Gibbs sampling.Multiple façade point cloud data with different features were selected from three datasets to verify the effectiveness of this method.The experimental results show that the proposed method achieves an average accuracy of 86.35%.Owing to its flexibility,the proposed layout graph model can deal with different types of façades and qualities of point cloud data,enabling a more robust and accurate reconstruc-tion of façade models. 展开更多
关键词 Building façade semantic reconstruction point cloud compound graph model stochastic process
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Markov Graph Model Computation and Its Application to Intrusion Detection 认领 引用
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作者 曾剑平 郭东辉 《Journal of Donghua University(English Edition)》 EI CAS 2007年第2期272-275,共4页
Markov model is usually selected as the base model of user action in the intrusion detection system (IDS). However, the performance of the IDS depends on the status space of Markov model and it will degrade as the spa... Markov model is usually selected as the base model of user action in the intrusion detection system (IDS). However, the performance of the IDS depends on the status space of Markov model and it will degrade as the space dimension grows. Here, Markov Graph Model (MGM) is proposed to handle this issue. Specification of the model is described, and several methods for probability computation with MGM are also presented. Based on MGM, algorithms for building user model and predicting user action are presented. And the performance of these algorithms such as computing complexity, prediction accuracy, and storage requirement of MGM are analyzed. 展开更多
关键词 Markov Graph Model intrusion detection probability computation
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TG-SMR:AText Summarization Algorithm Based on Topic and Graph Models 认领 引用 被引量：2
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作者 Mohamed Ali Rakrouki Nawaf Alharbe +1 位作者 Mashael Khayyat Abeer Aljohani 《Computer Systems Science & Engineering》 SCIE EI 2023年第4期395-408,共14页
Recently,automation is considered vital in most fields since computing methods have a significant role in facilitating work such as automatic text summarization.However,most of the computing methods that are used in r... Recently,automation is considered vital in most fields since computing methods have a significant role in facilitating work such as automatic text summarization.However,most of the computing methods that are used in real systems are based on graph models,which are characterized by their simplicity and stability.Thus,this paper proposes an improved extractive text summarization algorithm based on both topic and graph models.The methodology of this work consists of two stages.First,the well-known TextRank algorithm is analyzed and its shortcomings are investigated.Then,an improved method is proposed with a new computational model of sentence weights.The experimental results were carried out on standard DUC2004 and DUC2006 datasets and compared to four text summarization methods.Finally,through experiments on the DUC2004 and DUC2006 datasets,our proposed improved graph model algorithm TG-SMR(Topic Graph-Summarizer)is compared to other text summarization systems.The experimental results prove that the proposed TG-SMR algorithm achieves higher ROUGE scores.It is foreseen that the TG-SMR algorithm will open a new horizon that concerns the performance of ROUGE evaluation indicators. 展开更多
关键词 Natural language processing text summarization graph model topic model
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Parallelized User Clicks Recognition from Massive HTTP Data Based on Dependency Graph Model 认领 引用 被引量：1
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作者 FANG Cheng LIU Jun LEI Zhenming 《China Communications》 SCIE CSCD 2014年第12期13-25,共13页
With increasingly complex website structure and continuously advancing web technologies,accurate user clicks recognition from massive HTTP data,which is critical for web usage mining,becomes more difficult.In this pap... With increasingly complex website structure and continuously advancing web technologies,accurate user clicks recognition from massive HTTP data,which is critical for web usage mining,becomes more difficult.In this paper,we propose a dependency graph model to describe the relationships between web requests.Based on this model,we design and implement a heuristic parallel algorithm to distinguish user clicks with the assistance of cloud computing technology.We evaluate the proposed algorithm with real massive data.The size of the dataset collected from a mobile core network is 228.7GB.It covers more than three million users.The experiment results demonstrate that the proposed algorithm can achieve higher accuracy than previous methods. 展开更多
关键词 cloud computing massive data graph model web usage mining
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Continuous Multiplicative Attribute Graph Model 认领 引用 被引量：1
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作者 黄嘉烜 金小刚 《Journal of Shanghai Jiaotong university(Science)》 EI 2017年第1期87-91,共5页
Network modeling is an important approach in many fields in analyzing complex systems. Recently new series of methods have emerged, by using Kronecker product and similar tools to model real systems. One of such appro... Network modeling is an important approach in many fields in analyzing complex systems. Recently new series of methods have emerged, by using Kronecker product and similar tools to model real systems. One of such approaches is the multiplicative attribute graph(MAG) model, which generates networks based on category attributes of nodes. In this paper we try to extend this model into a continuous one, give an overview of its properties, and discuss some special cases related to real-world networks, as well as the influence of attribute distribution and affinity function respectively. 展开更多
关键词 multiplicative attribute graph model social network continuous attribute TP 181 A
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Spatiotemporal Data Graph Modeling and Exploration of Application Scenarios in “Power Grid One Graph” 认领 引用 被引量：8
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作者 Peng Li Zhen Dai +4 位作者 Yachen Tang Guangyi Liu Jiaxuan Hou Qinyu Feng Quanchen Lin 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2025年第2期538-551,共14页
By modeling the spatiotemporal data of the power grid, it is possible to better understand its operational status, identify potential issues and risks, and take timely measures to adjust and optimize the system. Compa... By modeling the spatiotemporal data of the power grid, it is possible to better understand its operational status, identify potential issues and risks, and take timely measures to adjust and optimize the system. Compared to the bus-branch model, the node-breaker model provides higher granularity in describing grid components and can dynamically reflect changes in equipment status, thus improving the efficiency of grid dispatching and operation. This paper proposes a spatiotemporal data modeling method based on a graph database. It elaborates on constructing graph nodes, graph ontology models, and graph entity models from grid dispatch data, describing the construction of the spatiotemporal node-breaker graph model and the transformation to the bus-branch model. Subsequently, by integrating spatiotemporal data attributes into the pre-built static grid graph model, a spatiotemporal evolving graph of the power grid is constructed. Furthermore, the concept of the “Power Grid One Graph” and its requirements in modern power systems are elucidated. Leveraging the constructed spatiotemporal node-breaker graph model and graph computing technology, the paper explores the feasibility of grid situational awareness. Finally, typical applications in an operational provincial grid are showcased, and potential scenarios of the proposed spatiotemporal graph model are discussed. 展开更多
关键词 “Power Grid One Graph” graph data modeling situational awareness spatiotemporal evolving graph spatiotemporal node-breaker graph model
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基于大语言模型和GraphRAG的科技文献图谱式摘要生成研究 认领 引用 被引量：2
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作者 马玮璐 孙坦 +1 位作者 赵瑞雪 鲜国建 《数据分析与知识发现》 EI CSSCI CSCD 北大核心 2026年第3期113-128,共16页
【目的】简化科技文献摘要撰写流程,生成结构化的图谱式摘要以辅助科研。【方法】选取PMC数据库的水稻育种相关论文,构建4276条“全文-摘要”问答对;通过实验遴选最优的提示词和温度系数,对Qwen2.5-7B-Instruct大模型进行有监督微调;将... 【目的】简化科技文献摘要撰写流程,生成结构化的图谱式摘要以辅助科研。【方法】选取PMC数据库的水稻育种相关论文,构建4276条“全文-摘要”问答对;通过实验遴选最优的提示词和温度系数,对Qwen2.5-7B-Instruct大模型进行有监督微调;将微调后的模型接入GraphRAG框架,生成每篇论文的图谱式摘要,并利用优选提示词通过全局查询生成文本摘要。【结果】在水稻育种测试集中,本文方法在ROUGE-1、ROUGE-2和ROUGE-L的F1值上较LightRAG基线模型分别提升44.16、61.36和54.87个百分点;在5分制人工评测得分平均提升1.78分,生成的图谱式摘要更能直观地揭示知识点间的逻辑关联。【局限】受限于算力资源,本研究选取的大模型参数量较小,模型生成能力仍有提升空间;此外,GraphRAG索引构建耗时较长,在实际应用中需进一步优化推理效率。【结论】知识图谱增强的检索生成技术能够深入捕捉论文中的远距离隐藏信息,生成更加全面且准确的论文摘要和层次清晰的图谱式摘要,便于提高科研人员的阅读效率,助力科研工作。 展开更多
关键词 文本摘要 图谱式摘要 大语言模型 GraphRAG
基于Graph RAG语义融合的知名科学家学术与社会影响问答研究 认领 引用 被引量：3
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作者 吴志祥 沙焕旭 +1 位作者 尹璐璐 毛进 《情报理论与实践》 CSSCI 北大核心 2026年第3期160-169,共10页
[目的/意义]知名科学家影响力的认知建构面临学术与社会影响割裂、表达碎片化的问题,制约了跨语境理解。本文尝试聚合多源文本语料中的结构化信息,实现科学家影响的语义融合与统一表达。[方法/过程]基于Graph RAG框架,设计多源数据融合... [目的/意义]知名科学家影响力的认知建构面临学术与社会影响割裂、表达碎片化的问题,制约了跨语境理解。本文尝试聚合多源文本语料中的结构化信息,实现科学家影响的语义融合与统一表达。[方法/过程]基于Graph RAG框架,设计多源数据融合方法,构建跨域知识图谱;引入人智协同方案生成多用户、深层次问题集;开展覆盖240万字语料的实验评估,从用户适配能力、回答质量与语义融合效果三个角度分析模型表现。[结果/结论]Graph RAG在跨语境语义融合方面表现优异,能有效缓解科学家数据分散与语义分割问题。其中,DeepSeek-V3-8B与bge-m3组合模型效果最佳,支持生成结构清晰、回答深入的科学家影响描述。本文为数智支撑的科学家与社会关系研究提供情报学方案。 展开更多
关键词 知名科学家 学术与社会影响 语义融合 Graph RAG 大语言模型
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DVG-GNN:Dual-View Graph Representation Learning for Encrypted Traffic Classification 认领 引用
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作者 Guan Yang Haozhen Wang +2 位作者 Yu Wang Weiguang Liu Bo Chen 《Computers, Materials & Continua》 SCIE EI 2026年第10期783-806,共24页
The rapid proliferation of encrypted communication technologies,such as TLS,VPNs,and Tor,has significantly limited the effectiveness of traditional traffic classification methods that rely on port numbers or deep pack... The rapid proliferation of encrypted communication technologies,such as TLS,VPNs,and Tor,has significantly limited the effectiveness of traditional traffic classification methods that rely on port numbers or deep packet inspection.While handcrafted statistical features provide partial solutions,they often lack robustness and generalization in complex traffic scenarios.Although deep learning models such as CNNs and RNNs can capture local and sequential patterns,they typically overlook higher-order structural dependencies among bytes.To address these challenges,we propose DVG-GNN,a Dual-View Graph representation learning framework for encrypted traffic classification.The framework decomposes each packet into header and payload views,leveraging distinct byte embeddings and multi-scale one-dimensional convolutions to extract fine-grained contextual features.View-specific graphs are constructed using Pointwise Mutual Information(PMI)to model byte-level relationships,and a GraphSAGE-based encoder with attention pooling is employed to learn global structural representations.A gated fusion mechanism further integrates the dual-view features to enhance discriminative capability.Extensive experiments on ISCX-VPN2016,ISCX-Tor2016,and USTC-TFC2016 demonstrate that the proposed method consistently outperforms state-of-the-art approaches across multiple evaluation metrics,validating its effectiveness and generalization ability in diverse encrypted traffic classification tasks. 展开更多
关键词 Encrypted traffic classification graph neural networks dual-view representation learning pointwise mutual information traffic graph modeling
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Ontology Matching Method Based on Gated Graph Attention Model 认领 引用
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作者 Mei Chen Yunsheng Xu +1 位作者 Nan Wu Ying Pan 《Computers, Materials & Continua》 SCIE EI 2025年第3期5307-5324,共18页
With the development of the Semantic Web,the number of ontologies grows exponentially and the semantic relationships between ontologies become more and more complex,understanding the true semantics of specific terms o... With the development of the Semantic Web,the number of ontologies grows exponentially and the semantic relationships between ontologies become more and more complex,understanding the true semantics of specific terms or concepts in an ontology is crucial for the matching task.At present,the main challenges facing ontology matching tasks based on representation learning methods are how to improve the embedding quality of ontology knowledge and how to integrate multiple features of ontology efficiently.Therefore,we propose an Ontology Matching Method Based on the Gated Graph Attention Model(OM-GGAT).Firstly,the semantic knowledge related to concepts in the ontology is encoded into vectors using the OWL2Vec*method,and the relevant path information from the root node to the concept is embedded to understand better the true meaning of the concept itself and the relationship between concepts.Secondly,the ontology is transformed into the corresponding graph structure according to the semantic relation.Then,when extracting the features of the ontology graph nodes,different attention weights are assigned to each adjacent node of the central concept with the help of the attention mechanism idea.Finally,gated networks are designed to further fuse semantic and structural embedding representations efficiently.To verify the effectiveness of the proposed method,comparative experiments on matching tasks were carried out on public datasets.The results show that the OM-GGAT model can effectively improve the efficiency of ontology matching. 展开更多
关键词 Ontology matching representation learning OWL2Vec*method graph attention model
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慢性病智能医疗问答系统构建与评价:一种基于GraphRAG与MoE的混合建模方法 认领 引用
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作者 马鑫 王芳 +1 位作者 张峰 李照川 《情报学报》 CSSCI CSCD 北大核心 2026年第3期447-462,共16页
随着慢性病成为全球公共卫生领域的核心挑战,患者对高质量、个性化、可持续的健康信息服务需求日益增长。近年来,尽管大语言模型在医疗问答任务中展现出显著优势,但现有系统在面对慢性病管理这一长期性、情境化、语义复杂的场景时,仍面... 随着慢性病成为全球公共卫生领域的核心挑战,患者对高质量、个性化、可持续的健康信息服务需求日益增长。近年来,尽管大语言模型在医疗问答任务中展现出显著优势,但现有系统在面对慢性病管理这一长期性、情境化、语义复杂的场景时,仍面临知识调度粒度粗、语义感知能力弱与模型响应一致性差等瓶颈。为此,本研究遵循“结构化知识建模—混合驱动检索—大模型协同应答”三阶段流程,提出一种融合图检索增强生成(graph retrievalaugmented generation,GraphRAG)与混合专家网络(mixture of experts,MoE)的慢性病问答系统。首先,构建覆盖疾病演化、生活方式干预和长期管理要素的多源异构专有知识图谱,通过结合关键词匹配、语义向量召回与多子图提示融合的三通道混合图谱检索机制,实现对复杂信息需求的动态知识调度;其次,初筛用户查询合法性与规范性,结合用户隐含意图与融合子图,通过MoE动态门控智能体对9种开源大模型进行指令级协同,实现语义深度与生成精度的双擎增强;最后,引入常识校验、内容完整性检查与格式化规则,精细预生成文本,确保输出结果的准确性、完整性与语言可读性。本研究自建覆盖118种慢性病与3类管理任务的测试集CdMedQA,综合采用客观指标评价和主观满意度对比两种方式验证系统性能。结果表明,本研究构建系统在准确性、清晰度、个性化及情境适应性等方面显著优于多种通用与医疗垂直大模型基线。研究结果不仅为慢性病智能化管理提供了新路径,也为多源知识驱动下人机交互优化与生成内容可信性提升提供了理论支持与技术方案。 展开更多
关键词 慢性病支持 医疗问答系统 混合专家网络 图检索增强生成 大语言模型
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基于Graph-RAG的BIM知识图谱智能检索系统研究 认领 引用
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作者 赵津磊 《现代信息科技》 2026年第11期62-67,共6页
针对建筑信息模型(BIM)属性命名不规范以及检索门槛高的问题,设计了一种利用DeepSeek-R1大模型与Neo4j图数据库开展的图增强检索(Graph-RAG)生成系统。运用正则增强的自然语言转图查询语言(NL2Cypher)映射技术与逻辑自愈拦截器,实现从... 针对建筑信息模型(BIM)属性命名不规范以及检索门槛高的问题,设计了一种利用DeepSeek-R1大模型与Neo4j图数据库开展的图增强检索(Graph-RAG)生成系统。运用正则增强的自然语言转图查询语言(NL2Cypher)映射技术与逻辑自愈拦截器,实现从工业基础类(IFC)模型到工程审计报告的自动化闭环。实测显示:映射阶段响应时间在812 ms以下;在对230个材质属性缺失构件的实验中,系统借助隐性语义挖掘实现了100%指令成功率,耗时61.151 s。研究表明:系统有效克服了对标准建模数据的依赖,显著提升了BIM数据治理效率以及辅助决策价值,为工程审计数字化提供了新路径。 展开更多
关键词 BIM DeepSeek-R1大模型 知识图谱 逻辑自愈 Graph-RAG NL2Cypher 工程审计 属性打平
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DOMINATING ATTITUDES IN THE GRAPH MODEL FOR CONFLICT RESOLUTION 认领 引用 被引量：7
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作者 Sean Bernath WALKER Keith W.HIPEL Takehiro INOHARA 《Journal of Systems Science and Systems Engineering》 SCIE EI CSCD 2012年第3期316-336,共21页
A formal methodology for analyzing the importance of weighing a decision maker＇s attitudes in a conflict is introduced and applied to the problem of negotiating a fair transfer of a brownfield property. A decision ma... A formal methodology for analyzing the importance of weighing a decision maker＇s attitudes in a conflict is introduced and applied to the problem of negotiating a fair transfer of a brownfield property. A decision maker＇s attitudes are expressed in his consideration of his own preferences, as well as those of his opponents. Dominating attitudes are used to suggest that in a circumstance in which a decision maker takes into account multiple perspectives due to his attitudes, he may favor one perspective more heavily. The analysis of a brownfield acquisition conflict illustrates the types of insights that this methodology reveals. 展开更多
关键词 Conflict analysis attitudes preferences graph model for conflict resolution dominatingattitudes brownfields
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基于SOP-Graph和AI辅助的职业教育课程开发:要义、框架与途径 认领 引用
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作者 向燕 郑洪波 《工业技术与职业教育》 2026年第1期78-82,共5页
提出了一种基于SOP-Graph(Standard Operating Procedure Graph)模型和AI技术的职业教育课程开发范式,旨在解决当前职业教育体系中标准更新滞后、课程内容脱节的问题。该范式的核心要义包括标准牵引与能力本位、任务化载体与“教学—学... 提出了一种基于SOP-Graph(Standard Operating Procedure Graph)模型和AI技术的职业教育课程开发范式,旨在解决当前职业教育体系中标准更新滞后、课程内容脱节的问题。该范式的核心要义包括标准牵引与能力本位、任务化载体与“教学—学习—评价一致性”、数据治理与敏捷迭代。基于这些要义,构建了“图谱化对齐—任务化同构—规则化协同—节拍化治理”的总体框架,并提出了包括入图建模、子图对齐、单元生成、版本管理等在内的六环节路径。结合OCR、命名实体识别(NER)和检索增强生成等AI技术,模型实现了从企业标准到能力、学习目标和教学评价的可计算映射与自动校验。相较于传统的以产出为导向的教育模式,本范式创新性地提出了以标准为源事实的溯源图谱与持续迭代的版本治理机制。研究的预期成果是促进“岗—课—赛—证”一体化,提升职业教育课程的应用性和可复制性,为职业教育的高质量发展提供技术支持。 展开更多
关键词 图谱建模 职业教育 课程开发 AI辅助
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ANALYZING MARKET COMPETITION BETWEEN AIRBUS AND BOEING USING A DUO HIERARCHICAL GRAPH MODEL FOR CONFLICT RESOLUTION 认领 引用 被引量：4
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作者 Shawei He Keith W.Hipel D.Marc Kilgour 《Journal of Systems Science and Systems Engineering》 SCIE EI CSCD 2017年第6期683-710,共28页
A duo hierarchical graph model for conflict resolution is developed to investigate market competition between Airbus and Boeing over aircraft sales in the Asia Pacific region.The duo hierarchical graph model,a signifi... A duo hierarchical graph model for conflict resolution is developed to investigate market competition between Airbus and Boeing over aircraft sales in the Asia Pacific region.The duo hierarchical graph model,a significant extension of the graph model for conflict resolution methodology,contains two common decision makers,who take part in two related subconflicts,as well as local decision makers,who participate in only one subconflict.New stability definitions are proposed to describe forms of sanction unique to the hierarchical model.The interrelationships between stabilities in the overall graph model and in the two local models are investigated.Then the duo hierarchical graph model is applied to the competition between Airbus and Boeing in both the wide and narrow body markets in the Asia-Pacific region.The two types of Asian airlines have different operating strategies,so that the two markets constitute sub-competitions that can be modelled naturally using the duo hierarchical graph model.The stability results indicate a resolution for all decision makers that implies marketing strategies for the aircraft manufacturers and guidelines for aircraft purchase by the airlines.Thus,this model provides decision makers with a comprehensive understanding of the dynamics of the comoetition and guidance in identifving beneficial actions. 展开更多
关键词 Hierarchical Graph Model Airbus and Boeing stability results strategic resolutions
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Context-sensitive Web service discovery over the bipartite graph model 认领 引用 被引量：1
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作者 Rong ZHANG Koji ZETTSU +2 位作者 Yutaka KIDAWARA Yasushi KIYOKI Aoying ZHOU 《Frontiers of Computer Science》 SCIE EI CSCD 2013年第6期875-893,共19页
As service oriented architecture （SOA） matures, service consumption demand leads to an urgent requirement for service discovery. Unlike Web documents, services are intended to be executed to achieve objectives and/o... As service oriented architecture （SOA） matures, service consumption demand leads to an urgent requirement for service discovery. Unlike Web documents, services are intended to be executed to achieve objectives and/or desired goals of users. This leads to the notion that service discovery should take the ＂usage context＂ of service into account as well as service content （descriptions） which have been well explored. In this paper, we introduce the concept of service context which is used to represent service usage. In query processing, both service content and service context are ex- amined to identify services. We propose to represent ser- vice context by a weighted bipartite graph model. Based on the bipartite graph model, we reduce the gap between query space and service space by query expansion to improve re- call. We also design an iteration algorithm for result ranking by considering service contextsefulness as well as contentrelevance to improve precision. Finally, we develop a service search engine implementing this mechanism, and conduct some experiments to verify our idea. 展开更多
关键词 Web service usage context bipartite graph model context-usefulness
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Transportation,germs,culture:a dynamic graph model of COVID-19 outbreak 认领 引用 被引量：1
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作者 Xiaofei Yang Tun Xu +4 位作者 Peng Jia Han Xia Li Guo Lei Zhang Kai Ye 《Quantitative Biology》 CAS CSCD 2020年第3期238-244,共7页
Backgrounds Various models have been applied to predict the trend of the epidemic since the outbreak of COVID-19.Methods:In this study,we designed a dynamic graph model,not for precisely predicting the number of infec... Backgrounds Various models have been applied to predict the trend of the epidemic since the outbreak of COVID-19.Methods:In this study,we designed a dynamic graph model,not for precisely predicting the number of infected cases,but for a glance of the dynamics under a public epidemic emergency situation and of different contributing factors・Results^We demonstrated the impact of asymptomatic transmission in this outbreak and showed the effectiveness of city lockdown to halt virus spread within a city.We further illustrated that sudden emergence of a large number of cases could overwhelm the city medical system,and external medical aids are critical to not only containing the further spread of the virus but also reducing fatality.Conclusions Our model simulation showed that highly populated modern cities are particularly vulnerable and lessons learned in China could facilitate other countries to plan the proactive and decisive actions・We shall pay close attention to the asymptomatic transmission being suggested by rapidly accumulating evidence as dramatic changes in quarantine protocol are required to contain SARS・CoV・2 from spreading globally. 展开更多
关键词 dynamic graph model transportation COVID-19 SARS-CoV-2
Stability analysis of reef fish communities based on symbiotic graph model 认领 引用 被引量：1
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作者 Danfeng Zhao Yaru Lou +2 位作者 Wei Song Dongmei Huang Xiaoliang Wang 《Aquaculture and Fisheries》 CSCD 2024年第6期1007-1017,共11页
The community stability of coral reefs and fish is the focus of ecological monitoring of coral reefs.Among them,the realization of effective metrics of variations in reef fish communities(i.e.,the combined communities... The community stability of coral reefs and fish is the focus of ecological monitoring of coral reefs.Among them,the realization of effective metrics of variations in reef fish communities(i.e.,the combined communities of coral reefs and fish)is important for analyzing the stability of communities as well as maintaining the ecological balance of coral reefs.Based on coral reef and fish data collected at St.John’s Island from 2004 to 2010,this study proposes a symbiotic graph modeling method to express the biological relationships of reef fish communities,and a Pyramid Match graph kernel method for fusing Attributes(PMA)to quantify community fluctuations to measure interannual variability of communities.The results showed that the community similarity was low in 2006,2007,and 2008.The total coral cover rate in the study area decreased by 32.04% from 2006 to 2007 and increased by 24% in 2008.The total number of fish fell from 3780 in 2006 to 2596 in 2007 and rose to 6249 in 2008.Among them,the proportion of herbivorous fish decreased to 30.84% in 2007.Furthermore,we have combined the Louvain algorithm with the proposed PMA method to effectively identify the regions that should be prioritized for protection.Experiments were conducted on real datasets with good results,demonstrating the potential of the proposed method to assist in the analysis of community stability and identification of priority conservation areas. 展开更多
关键词 Reef fish community Community stability Community variation Symbiotic graph model Graph kernel Conservation area
A Two-Level Hierarchical Graph Model for Conflict Resolution with Application to International Climate Change Negotiations 认领 引用 被引量：1
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作者 Shawei He Keith W.Hipel +1 位作者 Haiyan Xu Ye Chen 《Journal of Systems Science and Systems Engineering》 SCIE EI CSCD 2020年第3期251-272,共22页
A novel two-level hierarchical graph model is developed to analyze international climate change negotiations with hierarchical structures:the negotiations take place between two nations and between each nation and its... A novel two-level hierarchical graph model is developed to analyze international climate change negotiations with hierarchical structures:the negotiations take place between two nations and between each nation and its provincial governments.The two national government are two decision makers at the top level.Within each nation,the two provincial governments negotiate with the national government at the lower level.The theoretical structure of this novel model,including decision makers,options,moves,and preference relations,are developed.The interrelationship between the stabilities in the two-level hierarchical graph model and the stabilities in local models are investigated by theorems.These theorems can be utilized to calculate complete stabilities in the two-level hierarchical graph model when the stabilities in local graph models are known.The international climate change negotiations as the illustrative example is then investigated in detail.The extra equilibrium,uniquely obtained by this novel methodology,suggests that opposition may still be from one provincial government when the national government does not sign the international climate agreement and implements existing environmental laws.Compared with other approaches,this novel methodology is an effective and flexible tool in analyzing hierarchical conflicts at two levels by providing decision makers with strategic resolutions with broader vision. 展开更多
关键词 Conflict resolution hierarchical graph model climate change negotiations relative preference
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Determining Maximum Allowable Current of an RBS Using a Directed Graph Model and Greedy Algorithm 认领 引用 被引量：1
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作者 Binghui Xu Guangbin Hua +4 位作者 Cheng Qian Quan Xia Bo Sun Yi Ren Zili Wang 《Space(Science & Technology)》 EI 2024年第1期698-709,共12页
Reconfigurable battery systems(RBSs)provide a promising alternative to traditional battery systems due to their flexible and dynamically changeable topological structures that can be adapted to different battery charg... Reconfigurable battery systems(RBSs)provide a promising alternative to traditional battery systems due to their flexible and dynamically changeable topological structures that can be adapted to different battery charging and discharging strategies.A critical system parameter known as the maximum allowable current(MAC)is pivotal to RBS operation.This parameter is instrumental in maintaining the current of each individual battery within a safe range and serves as a guiding indicator for the system’s reconfiguration,ensuring its safety and reliability.This paper proposes a method for calculating the MAC of an arbitrary RBS using a greedy algorithm in conjunction with a directed graph model of the RBS.Using the shortest path of the battery,the greedy algorithm transforms the exhaustion of the switch states in the brute-force algorithm or variable search without utilizing structures in the heuristic algorithms in the combination of the shortest paths.The directed graph model,based on an equivalent circuit,provides a specific method for calculating the MAC of a given structure.The proposed method is validated using 2 previously published RBS structures and an additional one with a more complex structure.The results are the same as those from the brute-force algorithm,but the proposed method substantially improves the computational efficiency,being theoretically Ns2Ns−Nblog10Nb times faster than the brute-force algorithm for an RBS with Nb batteries and Ns switches.Another advantage of the proposed method is its ability to calculate the MAC of RBSs with arbitrary structures and variable batteries,even in scenarios with random isolated batteries. 展开更多
关键词 greedy algorithm directed graph model maximum allowable current traditional battery systems arbitrary structures maximum allowable reconfigurable battery systems reconfigurable battery systems rbss provide
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