共查询到20条相似文献，搜索用时 31 毫秒
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TAN Wen-an 《保鲜与加工》2004,(12):73-77
By analyzing the process of enterprise information engineering construction and intra relationship among information system requirement, business process modeling, application system constructing and project management, one of 4 meta model composed of requirement engineering, process engineering, application system engineering and support engineering is proposed for enterprise information engineering. The developments and applications of the business processes and its application systems are integrated into the same development space and application space. Basing on this, a prototype system composed of requirement modeling environment, business process modeling environment, application system modeling environment, and support engineering environment has been designed and built, which is used for supporting enterprise information engineering constructing. It is valued for the enterprise information engineering construction in our country. 相似文献
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The development of E commerce is booming. Now the management of some domain is converting from tradition to E commerce, this needs the application and integration of the latest information technologies for the maximum usage and share of network information resources. As a modeling language, Unified Modeling Language (UML) is well defined, easy to specify, powerful in function and applied widely. Business model concentrates on the business around the system, not every project requires business model. However, there are many situations where business modeling adds a great deal of value. Establishing system business model is the primary task when people make use of UML to establish E commerce system model and develop software system. By E commerce system the authors expound the use case, and propose how to use correct method to establishing E commerce system business model. 相似文献
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《保鲜与加工》2003,(10):6-9
A kind of useful virtual dynamic model of motorcycle is established with dynamic analysis software ADAMS. Some related key problems regarding dynamical modeling is researched. By inputting road load spectrum, the ride comfort of motorcycle is analyzed and the simulating results are evaluated. Based on the evaluating results, the strength of front and rear damping springs are optimized and the performance of the redesigned product is improved. 相似文献
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LI Shao bin 《保鲜与加工》2002,(4):29
To research the problem of plastic art design and emulation of products with the virtual reality technology can short the product development cycle and reduce the cost. This paper discusses the information based on the product feature ,solid model with parameters, the structure and function of this system. Combined the product properties with its solid model. Proposed a method with CAD to create the model of the product based on features in the product design. Expressed its feature parameter and shape of model fully .In the case for a deceleration box the feature model has solved the problem of physical information ,geometry information and the informative process in its production management system efficiently. 相似文献
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A product family extension configuration method based on evaluation model for customer demands, relational mapping and extension association rules is introduced to better realize rapid and effective product configuration. A demand-based evaluation model is confirmed by the information of customer demands and a mapping relationship between demand-based model and characters of product family cases is built. The similarity between evaluation model and product family cases is up to the association rules and a product family case with the highest similarity can be extracted according to association rules. According to the situation of the similarity, the extracted case is modified to meet the demands of configuration with case-based reasoning method. The method is validated by a speed reducer case. 相似文献
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To deal with the complexity problems of design tasks decomposition and allocation in the process of product collaborative innovation, a task decomposition model based on mapping level function, structure and task and fuzzy search and matching collaborative partners is proposed by considering the dependencies between the design tasks and the design capacity constraints of innovative subjects. Then on the basis of studying the classification and attributes of design resource, a design resources allocation model with resource use threshold is established to compensate the lack of resource allocation by the priority strategy for design tasks, and the simulation modeling for task-resource allocation based on the time colored Petri net is carried out. Finally, a product collaborative innovation design R & D case of a certain brand phone is imported to verify the effectiveness of the proposed model. 相似文献
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Physics based modeling is one of the keen free form surface modeling method at present, and it should be a practical surface modeling method in the future. In Physics based modeling, the object is viewed as a physics and not a pure geometry model. According to its physics principle and math representation, the physics based models are mainly classified into two types:energy model and dynamic Lagrangian model. The fundamental theory is introduced, and the principle, development and application state of each model is reviewed. To provide designer more naturally design ability and to introduce more flexible geometric modeling methods are the prospect of future researches on physics based free form surface modeling is outlined at last. 相似文献
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Information integrating is the most important key to CIMS,which is the base of the function integrating and all others.Because of so many kinds,so complicated structure,so many different sources and uses that the information in CIMS has,it is necessary to build a popular Information Integrating Model. The model of information integrating in the thesis bases on the enterprise model,which is presented by ISO(International Organization for Standardization).According to the object-oriented method,the process of modeling begins with classifying the information,and then describes the definition of the attributes and the structural relation of those objects. By means of the idea of Encapsulation and Inheritance,the destination of information integrating can be arrive and the model of information integrating can be set up. The model which is based on the share information is helpful to finish the function integrating and the whole CIMS' construction. Moreover,the system which is developed following such program can be reused for many times and the developing circle of CIMS can be apparently shortened,too. 相似文献
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In order to improve the alerts quality and prediction capability of traditional intrusion detection systems (IDS), the advanced alerts correlation algorithms are proposed, which is based on attack scenarios modeling using colored petri net (CPN). The current analysis approach information filtering is updated to messages logic deduction by reasoning under the model. The alert and the attack are converted to two different parameters for computation. By means of transforming CPN model and calculating the minimal covering set, the algorithms for multi-step attack and cooperative attack are designed. The experimental alerts correlation analysis system (ACAS) is programmed. That experiment results indicate that these algorithms could be applied to improve the alerts quality and prediction ability of IDS effectively. 相似文献
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在单因素试验确定的食盐添加量(A)、发酵温度(B)、发酵时间(C)、接种量(D)各较优化工艺参数的基础上进行4因素3水平正交实验,以pH值为指标,并兼顾产品品质,综合分析后确定4因素最佳工艺条件为:A1B2C2D3,即采用食盐添加量为2%,发酵温度为30℃,发酵时间为22 h,清酒乳杆菌3%接种量. 相似文献
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Fast modeling of the motor broadband equivalent circuit model 总被引：2，自引：0，他引：2
This paper proposes a modeling method of the motor broadband equivalent circuit model. The impedance amplitude-frequency characteristics of the motor terminal through measuring are obtained. The impedance amplitude-frequency characteristics are devided into several regions based on its first resonant point information,and the motor broadband circuit topology is developed with each region equaling a resonance unit. The RLC parameters of resonance unit are extracted through frequency and corresponding impedance of the any non-resonant and resonant point in each unit. This proposed method is used to build DC and AC motor broadband equivalent circuit model. Their impedance amplitude-frequency characteristics are simulated by the Saber software. The measurement results and the simulation result of references are compared. The DC motor simulation results coincide with the measurement results in 0.1~50 MHz,and the AC motor is in 0.1~40 MHz. The results show that the motor broadband circuit model is reliable and feasible. 相似文献
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Surface reconstruction is reproduction process of geometric topology information and feature bases on surface practicality model. The quality of surface reconstruction directly influences performance of production, analysis and manufacture. To improve quality of design and meet requirement of fair, precision, it's researched by the numbers the geometric modeling and constraint of surface reconstruction. Feature-based surface model reconstruction technique is discussed in this article. Combine with 3D model design of motor body covering, an engineering application is given finally. 相似文献
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苹果花序几何造型及可视化研究 总被引：7，自引：1，他引：6
为了实现对苹果花及花序三维形态结构的交互设计、几何建模和真实感现实,提出了精确描述苹果花序三维形态结构的数学模型及可视化方法。通过对苹果花及花序形态结构的观测分析,分别提出了描述花柄、花托、花萼、花瓣、雄蕊和雌蕊三维形态结构的数学模型,并提取了模型的控制参数;进一步整合苹果花及花序的拓扑结构信息,实现了苹果花及花序的三维重建。为了增强花的真实感,提出了花柄、花托和花萼上绒毛的生成方法。结果表明,该方法可控性强,易于操作,可以精确重构出苹果花和花序的三维形态,实现对开花过程的可视化模拟,具有较强的真实感。 相似文献
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Numerical models based on FLAC 3D are difficult to build. A new kind of method modeling and meshing in the CATIA software, named the CATIA-FLAC 3D coupled modeling method, was proposed. This method utilizes the powerful geological modeling capabilities of CATIA for three-dimensional geological body modeling and meshing. And then, the interface program of CATIA-FLAC 3D is adopted to export the information into FLAC 3D, which is coded by visual basic language based on the variance of nodes and elements between the two software. The new proposed method was used in a bias tunnel through a mountain, and the results verified the feasibility and effectiveness of the proposed method. 相似文献
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A wide range of scenario studies aiming at rural development require regional patterns of crop yield. This study aims to evaluate three different modeling approaches for their suitability to assess regional potato yield patterns. The three model approaches include (1) an empirical model; (2) a process-based crop growth simulation model; and (3) a metamodel derived from the crop growth simulation model. Scenario studies have specific requirements for these modeling approaches including (1) their ease to use, (2) a realistic sensitivity, (3) the relevance in terms of generating the desired system property, and (4) their credibility in producing recognizable plausible outputs for stakeholders. The modeling approaches were applied to assess patterns of potato yields in a major production area in northern Ecuador. All three modeling approaches require significant expert knowledge for their development and calibration. However, after this initial phase, the empirical model and the metamodel are very easy to use and transparent. However, their application domain is limited to the case study area. The application of the crop growth simulation model remains complex and the model functions as a black box. The results show that regional patterns of potato yield are determined by a limited number of variables. The sensitivity of all three modeling approaches to climatic factors and water holding capacity suggest that the potato production in the area is constrained by water availability and temperature. All models generate similar yield patterns. However, the empirical model derives quality adjusted potato yields that correlate highly to the observed yields, whereas the crop growth simulation model and the derived metamodel produce potential, water and nutrient limited yields. Scenario studies may require yield patterns at different levels of resolution. All results could be aggregated to different resolutions but in general the patterns remained very similar. All three modeling approaches were capable to reproduce the observed regional pattern of potato yield and are therefore considered to be credible. In analyzing the effect of spatial aggregation on the performance of the modeling approaches, the results show that aggregation improves the overall correspondence between model output and interpolated, observed yields. It can be concluded that the various modeling approaches have their unique value. They are therefore complementary to each other for the interpretation of the observed patterns. The patterns themselves do not vary much and as such the most convenient modeling approach can be selected (based on available expertise and data). 相似文献
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区块链技术及其在农产品质量安全追溯应用的研究进展 总被引：1，自引：1，他引：0
农产品质量安全是一个备受关注的公共卫生问题,追溯应用已成为保障农产品质量安全的有效手段。确保溯源数据的真实性和安全性,成为追溯应用研究的重点和亟需解决的问题。区块链是一个综合多种技术并确保完全去中心化点对点系统完备性的完整技术方案,具有去中心化、透明化、去信任和数据不可篡改等优点,不受传统中心式技术的制约,在农产品质量安全追溯应用上有很大的发展空间。文章概述了区块链技术的基础架构、关键技术及其在追溯应用上的特点,以及区块链技术和农产品质量追溯的内在关系;通过分析基于公有链、联盟链和改良模式的农产品质量安全追溯研究进展和技术特点,总结了区块链技术在农产品质量安全追溯研究中存在的问题,结合区块链发展趋势,提出了注重横向技术融合、加强监测数据信息上链、建立农产品追溯激励惩罚机制等研究展望。 相似文献