期刊文献+
共找到1,069篇文章
< 1 2 54 >
每页显示 20 50 100
Enhancing Relational Triple Extraction in Specific Domains:Semantic Enhancement and Synergy of Large Language Models and Small Pre-Trained Language Models
1
作者 Jiakai Li Jianpeng Hu Geng Zhang 《Computers, Materials & Continua》 SCIE EI 2024年第5期2481-2503,共23页
In the process of constructing domain-specific knowledge graphs,the task of relational triple extraction plays a critical role in transforming unstructured text into structured information.Existing relational triple e... In the process of constructing domain-specific knowledge graphs,the task of relational triple extraction plays a critical role in transforming unstructured text into structured information.Existing relational triple extraction models facemultiple challenges when processing domain-specific data,including insufficient utilization of semantic interaction information between entities and relations,difficulties in handling challenging samples,and the scarcity of domain-specific datasets.To address these issues,our study introduces three innovative components:Relation semantic enhancement,data augmentation,and a voting strategy,all designed to significantly improve the model’s performance in tackling domain-specific relational triple extraction tasks.We first propose an innovative attention interaction module.This method significantly enhances the semantic interaction capabilities between entities and relations by integrating semantic information fromrelation labels.Second,we propose a voting strategy that effectively combines the strengths of large languagemodels(LLMs)and fine-tuned small pre-trained language models(SLMs)to reevaluate challenging samples,thereby improving the model’s adaptability in specific domains.Additionally,we explore the use of LLMs for data augmentation,aiming to generate domain-specific datasets to alleviate the scarcity of domain data.Experiments conducted on three domain-specific datasets demonstrate that our model outperforms existing comparative models in several aspects,with F1 scores exceeding the State of the Art models by 2%,1.6%,and 0.6%,respectively,validating the effectiveness and generalizability of our approach. 展开更多
关键词 Relational triple extraction semantic interaction large language models data augmentation specific domains
下载PDF
Mechatronic Modeling and Domain Transformation of Multi-physics Systems
2
作者 Clarence W.DE SILVA 《Instrumentation》 2021年第1期14-28,共15页
The enhanced definition of Mechatronics involves the four underlying characteristics of integrated,unified,unique,and systematic approaches.In this realm,Mechatronics is not limited to electro-mechanical systems,in th... The enhanced definition of Mechatronics involves the four underlying characteristics of integrated,unified,unique,and systematic approaches.In this realm,Mechatronics is not limited to electro-mechanical systems,in the multi-physics sense,but involves other physical domains such as fluid and thermal.This paper summarizes the mechatronic approach to modeling.Linear graphs facilitate the development of state-space models of mechatronic systems,through this approach.The use of linear graphs in mechatronic modeling is outlined and an illustrative example of sound system modeling is given.Both time-domain and frequency-domain approaches are presented for the use of linear graphs.A mechatronic model of a multi-physics system may be simplified by converting all the physical domains into an equivalent single-domain system that is entirely in the output domain of the system.This approach of converting(transforming)physical domains is presented.An illustrative example of a pressure-controlled hydraulic actuator system that operates a mechanical load is given. 展开更多
关键词 Mechatronic modeling Multi-physics Systems Integrated unified Unique and Systematic Approach Linear Graphs Physical domain Conversion/Transformation
下载PDF
Capability requirements modeling and verification based on fuzzy ontology 被引量:4
3
作者 Qingchao Dong Zhixue Wang Weixing Zhu Hongyue He 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第1期78-87,共10页
The capability requirements of the command, control, communication, computing, intelligence, surveillance, reconnaissance (C41SR) systems are full of uncertain and vague information, which makes it difficult to mode... The capability requirements of the command, control, communication, computing, intelligence, surveillance, reconnaissance (C41SR) systems are full of uncertain and vague information, which makes it difficult to model the C41SR architecture. The paper presents an approach to modeling the capability requirements with the fuzzy unified modeling language (UML) and building domain ontologies with fuzzy description logic (DL). The UML modeling constructs are extended according to the meta model of Depart- ment of Defense Architecture Framework to improve their domain applicability, the fuzzy modeling mechanism is introduced to model the fuzzy efficiency features of capabilities, and the capability requirement models are converted into ontologies formalized in fuzzy DL so that the model consistency and reasonability can be checked with a DL reasoning system. Finally, a case study of C41SR capability requirements model checking is provided to demonstrate the availability and applicability of the method. 展开更多
关键词 fuzzy ontology fuzzy unified modeling language (UML) fuzzy description logic (DL) model checking.
下载PDF
Formalization and Verification of Business Process Modeling Based on UML and Petri Nets 被引量:1
4
作者 颜志军 甘仞初 《Journal of Beijing Institute of Technology》 EI CAS 2005年第2期212-216,共5页
In order to provide a quantitative analysis and verification method for activity diagrams based business process modeling, a formal definition of activity diagrams is introduced. And the basic requirements for activit... In order to provide a quantitative analysis and verification method for activity diagrams based business process modeling, a formal definition of activity diagrams is introduced. And the basic requirements for activity diagrams based business process models are proposed. Furthermore, the standardized transformation technique between business process models and basic Petri nets is presented and the analysis method for the soundness and well-structured properties of business processes is introduced. 展开更多
关键词 business process modeling unified modeling language(UML) Petri nets activity diagram
下载PDF
A UML profile for framework modeling 被引量:1
5
作者 徐小良 汪乐宇 周泓 《Journal of Zhejiang University Science》 CSCD 2004年第1期92-98,共7页
The current standard Unified Modeling Language(UML) could not model framework flexibility and extendibility adequately due to lack of appropriate constructs to distinguish framework hot-spots from kernel elements. A n... The current standard Unified Modeling Language(UML) could not model framework flexibility and extendibility adequately due to lack of appropriate constructs to distinguish framework hot-spots from kernel elements. A new UML profile that may customize UML for framework modeling was presented using the extension mechanisms of UML, providing a group of UML extensions to meet the needs of framework modeling. In this profile, the extended class diagrams and sequence diagrams were defined to straightforwardly identify the hot-spots and describe their instantiation restrictions. A transformation model based on design patterns was also put forward, such that the profile based framework design diagrams could be automatically mapped to the corresponding implementation diagrams. It was proved that the presented profile makes framework modeling more straightforwardly and therefore easier to understand and instantiate. 展开更多
关键词 Object oriented frameworks unified modeling language(UML) UML profile Hot spots Design patterns
下载PDF
Spatial data modeling for coalfield geological environment
6
作者 JIA Bei SU Qiao-mei LIU Chen LI Hui-juan 《Journal of Coal Science & Engineering(China)》 2010年第3期300-305,共6页
Presented a study on the design and implementation of spatial data modelingand application in the spatial data organization and management of a coalfield geologicalenvironment database.Based on analysis of a number of... Presented a study on the design and implementation of spatial data modelingand application in the spatial data organization and management of a coalfield geologicalenvironment database.Based on analysis of a number of existing data models and takinginto account the unique data structure and characteristic, methodology and key techniquesin the object-oriented spatial data modeling were proposed for the coalfield geological environment.The model building process was developed using object-oriented technologyand the Unified Modeling Language (UML) on the platform of ESRI geodatabase datamodels.A case study of spatial data modeling in UML was presented with successful implementationin the spatial database of the coalfield geological environment.The modelbuilding and implementation provided an effective way of representing the complexity andspecificity of coalfield geological environment spatial data and an integrated managementof spatial and property data. 展开更多
关键词 spatial data model OBJECT-ORIENTED unified modeling language (UML) coal- field geological environment
下载PDF
Modeling and OLAP Cubes for Database of Ground and Municipal Water Supply
7
作者 Taskeen Zaidi Annapurna Singh Vipin Saxena 《Computational Water, Energy, and Environmental Engineering》 2013年第3期77-82,共6页
Modeling plays an important role for the solution of the complex research problems. When the database became large and complex then it is necessary to create a unified model for getting the desired information in the ... Modeling plays an important role for the solution of the complex research problems. When the database became large and complex then it is necessary to create a unified model for getting the desired information in the minimum time and to implement the model in a better way. The present paper deals with the modeling for searching of the desired information from a large database by storing the data inside the three dimensional data cubes. A sample case study is considered as a real data related to the ground water and municipal water supply, which contains the data from the various localities of a city. For the demonstration purpose, a sample size is taken as nine but when it becomes very large for number of localities of different cities then it is necessary to store the data inside data cubes. A well known object-oriented Unified Modeling Language (UML) is used to create Unified class and state models. For verification purpose, sample queries are also performed and corresponding results are depicted. 展开更多
关键词 modeling DATABASE OBJECT-ORIENTED unified modeling language OLAP Data CUBES Water Supply
下载PDF
An Embedded Software Modeling and Process by Using Aspect-Oriented Approach
8
作者 Yong-Yi FanJiang Jong-Yih Kuo Shang-Pin Ma 《Journal of Software Engineering and Applications》 2011年第2期106-122,共17页
In recent years, mobile devices have become widespread and refined, and they have offered increased convenience in human life. For these reasons, a variety of embedded systems have been designed. Therefore, improving ... In recent years, mobile devices have become widespread and refined, and they have offered increased convenience in human life. For these reasons, a variety of embedded systems have been designed. Therefore, improving methods for developing of embedded software systematically has become an important issue. Platform-based design is one example of an embedded-system design method that can reduce the design cost via improving a design’s abstraction level. However, platform-based design lacks precise definitions for platforms and design processes. This paper provides an approach that combines the aspects and platform-based design methods for developing embedded software. The approach is built on platform-based design methodology and uses the separating of concerns (SoC) concept to define the aspects and to reduce the crosscutting concerns in embedded system modeling. For aspect issues, we use the extended UML notation with aspects to describe both the static structure and the dynamic structure of the embedded system. We used an example of a digital photo frame system to demonstrate our approach. 展开更多
关键词 Platform-Based Design ASPECT-ORIENTED unified modeling language EMBEDDED SOFTWARE
下载PDF
MODELING OF FMS BASED ON UML AND OPNS
9
作者 Gao Meimei Wu Zhiming (Department of Automation, Shanghai Jiaotong University) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2000年第2期90-95,共6页
As the main component of computer integrated manufacturing system (CIMS), flexible manufacturing system (FMS) should be an open system with reusability and extenchaility. Moreover, as FMS is a complex asynchronous con... As the main component of computer integrated manufacturing system (CIMS), flexible manufacturing system (FMS) should be an open system with reusability and extenchaility. Moreover, as FMS is a complex asynchronous concurrent system, its model also should have the abilities to express the concurrency in the system and to analyze the behavior of the system. It is difficult to use any one method to model such a complex system as FMS. A modeling method using Object-oriented modeling language-unified modeling language (UML) and object-Oriented Petri nets (OPNs) is proposed. Class diagram in UML is used to represent the static relations among the objects in FMS. OPNs are used to model the dynamic behavior of the objects and conduct performance analysis. OPNs also can be used to identify the attributes and operations of the objects. The model can describe the system integrally and can be used to design FMS control software naturally. 展开更多
关键词 Flexible manufacturing system modeling Object-oriented model unified modeling language Object-oriented Pert nets (Opens)
下载PDF
Modelica语言及其多领域统一建模与仿真机理 被引量:121
10
作者 赵建军 丁建完 +1 位作者 周凡利 陈立平 《系统仿真学报》 CAS CSCD 北大核心 2006年第z2期570-573,共4页
详细介绍了Modelica语言及其主要特点,系统地阐述了Modelica语言的多领域统一建模与仿真原理,分析了Modelica语言适合于复杂系统建模的内在原因,探讨了基于Modelica语言的复杂产品建模方法,综述了基于Modelica语言的建模仿真工具研究现... 详细介绍了Modelica语言及其主要特点,系统地阐述了Modelica语言的多领域统一建模与仿真原理,分析了Modelica语言适合于复杂系统建模的内在原因,探讨了基于Modelica语言的复杂产品建模方法,综述了基于Modelica语言的建模仿真工具研究现状,总结了采用Modelica语言进行多领域统一建模的优势。 展开更多
关键词 多领域 统一建模 协同仿真 Modlica
下载PDF
多领域建模语言Modelica类型解析研究与实现 被引量:5
11
作者 吴民峰 吴义忠 +1 位作者 周凡利 陈立平 《计算机工程与应用》 CSCD 北大核心 2006年第25期80-83,共4页
类型解析是编译器开发的一项重要工作,也是语义分析的一个最重要组成部分。基于Modelica建模语言,研究了编译器类型系统的作用域、类型检查等关键技术,提出了类型系统的解析和查找机制,实现了类型检查及错误处理机制,并在多领域物理系... 类型解析是编译器开发的一项重要工作,也是语义分析的一个最重要组成部分。基于Modelica建模语言,研究了编译器类型系统的作用域、类型检查等关键技术,提出了类型系统的解析和查找机制,实现了类型检查及错误处理机制,并在多领域物理系统建模与仿真平台MWorks系统中得到应用。 展开更多
关键词 类型系统 modelICA 多领域 建模语言
下载PDF
多体动力学模型的Modelica语言建模 被引量:3
12
作者 刘俊 黄运保 +1 位作者 陈立平 王启富 《中国机械工程》 EI CAS CSCD 北大核心 2010年第9期1088-1093,共6页
对Adams多体模型结构及Modelica模型的转换方法进行了研究。对多体动力学模型结构及建模方式进行分析,根据Adams多体模型结构设计了对应的Modelica多体模型结构。研究了Adams多体模型各组件包含的信息,以及与Modelica模型的异同,提出了... 对Adams多体模型结构及Modelica模型的转换方法进行了研究。对多体动力学模型结构及建模方式进行分析,根据Adams多体模型结构设计了对应的Modelica多体模型结构。研究了Adams多体模型各组件包含的信息,以及与Modelica模型的异同,提出了各多体组件的转换方法。最后给出了多体模型转换验证实例与结果。该研究有助于提高多领域仿真系统的多体建模效率及与传统多体系统的兼容性。 展开更多
关键词 多领域统一建模 modelICA语言 多体动力学模型 模型转换
下载PDF
基于仿真建模语言Modelica的多领域仿真实现 被引量:9
13
作者 于涛 曾庆良 《山东科技大学学报(自然科学版)》 CAS 2005年第4期13-16,共4页
介绍了Modelica语言发展背景及特点,并对其语法结构进行了分析。介绍了Modelica模型库和Modelica仿真建模工具。最后,在仿真建模软件Dymola中,对一直流电机驱动系统进行了建模和仿真。仿真结果证明,Modelica语言及其模型库简单、易用,... 介绍了Modelica语言发展背景及特点,并对其语法结构进行了分析。介绍了Modelica模型库和Modelica仿真建模工具。最后,在仿真建模软件Dymola中,对一直流电机驱动系统进行了建模和仿真。仿真结果证明,Modelica语言及其模型库简单、易用,在多领域仿真建模中有很好的发展前景。 展开更多
关键词 多领域仿真 仿真建模语言 modelICA 面向对象
下载PDF
基于Modelica的电动汽车悬架系统建模与仿真分析 被引量:2
14
作者 刘炜 吴义忠 +1 位作者 陈立平 熊会元 《汽车技术》 北大核心 2014年第9期43-47,共5页
基于多领域统一建模的标准语言Modelica建立了电动汽车悬架系统模型库,并以一款电动客车的悬架系统为研究对象,对其操纵稳定性和行驶平顺性进行仿真分析,验证了悬架系统建模的准确性。采用正交试验方法对行驶平顺性进行了优化。仿真和... 基于多领域统一建模的标准语言Modelica建立了电动汽车悬架系统模型库,并以一款电动客车的悬架系统为研究对象,对其操纵稳定性和行驶平顺性进行仿真分析,验证了悬架系统建模的准确性。采用正交试验方法对行驶平顺性进行了优化。仿真和优化结果表明,所设计悬架能够满足电动汽车的性能需求。 展开更多
关键词 多领域统一建模 悬架系统 modelICA 电动汽车
下载PDF
Modelica语言建模特性研究 被引量:18
15
作者 黄华 周凡利 《机械与电子》 2005年第8期62-65,共4页
探讨了Modelica语言面向对象、陈述式、多领域和离散混合建模的语言特征,并和C++,Java和Simulink语言做了比较。归纳和列举的类定义、语法等价、子类、变型机制、泛类、连接器,if和when等语言要素是理解Modelica的其它语言特性的基础。
关键词 面向对象 统一建模 语言特性
下载PDF
基于表达式树的Modelica单位检查和推导 被引量:1
16
作者 赵建军 陈闻豪 《计算机辅助工程》 2013年第4期76-81,共6页
为提高多领域物理系统统一建模中复杂模型的质量和可靠性,介绍Modelica对单位的支持方式以及单位之间的换算和运算规则,基于对表达式树的遍历,给出单位检查和推导机制的实现方案.通过分析该方案的时间复杂度,优化影响其效率的主要因素.... 为提高多领域物理系统统一建模中复杂模型的质量和可靠性,介绍Modelica对单位的支持方式以及单位之间的换算和运算规则,基于对表达式树的遍历,给出单位检查和推导机制的实现方案.通过分析该方案的时间复杂度,优化影响其效率的主要因素.在MWorks上实现该方案,并通过Modelica标准库中的模型证明该方案可行. 展开更多
关键词 modelICA 表达式树 多领域物理系统 统一建模 模型可靠性 MWorks
下载PDF
基于Modelica的磁流变制动器多领域建模与仿真
17
作者 李志华 原龙昊 龚友平 《机电工程》 CAS 2015年第12期1539-1543,共5页
针对磁流变制动器的多领域耦合建模问题,对磁流变制动器的工作原理和多领域模型的构建进行了研究。基于Modelica/MWorks平台,采用多领域统一建模方法,建立了磁流变制动器的多领域统一模型。分析了结构参数、磁路参数、材料特性、工作间... 针对磁流变制动器的多领域耦合建模问题,对磁流变制动器的工作原理和多领域模型的构建进行了研究。基于Modelica/MWorks平台,采用多领域统一建模方法,建立了磁流变制动器的多领域统一模型。分析了结构参数、磁路参数、材料特性、工作间隙、转轴转速和励磁电流等因素对制动性能的影响,并对磁流变制动器在不同参数下的制动性能进行了仿真;同时,设计并制造了一款用于微型汽车的单盘式磁流变制动器,搭建了制动器性能测试平台,将实验结果与仿真结果进行了比较,两者基本吻合。研究结果表明,用多领域统一建模的方法构建的磁流变制动器模型具有较高的精确性,该建模仿真方法为磁流变制动器后续的优化设计及产品开发奠定了基础,对其他磁流变装置的研究开发也具有借鉴作用。 展开更多
关键词 磁流变制动器 多领域统一建模 仿真 modelICA
下载PDF
基于Modelica多领域建模仿真研究现状与思考 被引量:3
18
作者 吕有界 《广州航海高等专科学校学报》 2014年第2期31-33,共3页
Modelica语言是为解决多领域物理系统的统一建模与协同仿真的一种基于方程的陈述式建模语言.对Modelica语言进行了简单介绍,主要介绍了目前国内利用Modelica语言进行复杂系统多领域建模与仿真研究现状,并对基于Modelica混联机器人多领... Modelica语言是为解决多领域物理系统的统一建模与协同仿真的一种基于方程的陈述式建模语言.对Modelica语言进行了简单介绍,主要介绍了目前国内利用Modelica语言进行复杂系统多领域建模与仿真研究现状,并对基于Modelica混联机器人多领域建模与仿真进行了思考,说明了混联机器人多领域建模与仿真的主要内容与关键技术,为混联机器人多领域建模与仿真提供参考. 展开更多
关键词 modelICA语言 多领域建模 应用研究现状
下载PDF
基于Modelica的虚拟电工电子网络实验室设计 被引量:4
19
作者 施正寅 朱善安 《计算机工程》 CAS CSCD 2012年第11期287-289,共3页
为方便学生通过互联网进行电类课程实验,设计一种基于Modelica的虚拟电工电子网络实验室iEEVL。该实验平台利用Modelica进行多课程的统一建模,涵盖电路原理、模拟电子技术、数字电子技术、微电子器件、单片机原理、数字信号处理原理与... 为方便学生通过互联网进行电类课程实验,设计一种基于Modelica的虚拟电工电子网络实验室iEEVL。该实验平台利用Modelica进行多课程的统一建模,涵盖电路原理、模拟电子技术、数字电子技术、微电子器件、单片机原理、数字信号处理原理与技术等课程。仿真结果表明,该平台具有较好的可扩展性,用户可以通过建立新的Modelica模型进行实验。 展开更多
关键词 电工电子网络实验室 虚拟实验 远程教育 统一建模 modelICA语言
下载PDF
A Fuzzy Set-Based Approach for Model-Based Internet-Banking System Security Risk Assessment 被引量:3
20
作者 LI Hetian LIU Yun HE Dequan 《Wuhan University Journal of Natural Sciences》 CAS 2006年第6期1869-1872,共4页
A fuzzy set-based evaluation approach is demonstrated to assess the security risks for internet-banking System. The Internet-banking system is semi-formally described using Unified Modeling Language (UML) to specify... A fuzzy set-based evaluation approach is demonstrated to assess the security risks for internet-banking System. The Internet-banking system is semi-formally described using Unified Modeling Language (UML) to specify the behavior and state of the system on the base of analyzing the existing qualitative risk assessment methods. And a quantitative method based on fuzzy set is used to measure security risks of the system, A case study was performed on the WEB server of the Internet-banking System using fuzzy-set based assessment algorithm to quantitatively compute the security risk severity. The numeric result also provides a method to decide the most critical component which should amuse the system administrator enough attention to take the appropriate security measure or controls to alleviate the risk severity. The experiments show this method can be used to quantify the security properties for the Internet-banking System in practice. 展开更多
关键词 risk assessment system security fuzzy set unified modeling language
下载PDF
上一页 1 2 54 下一页 到第
使用帮助 返回顶部