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1.
《Journal of The Franklin Institute》2019,356(12):6678-6696
A network application serves as the response process to the user request. The network application, taking the traffic as operation carrier, is closely related with process features. The existing investigations mainly focus on the traffic generation by capturing request feature, which is insufficient to characterize the application operation with specific processes. Thus, this paper presents a network application model with operational process feature, where the operation process is introduced in network applications in addition to characterizing traffic element from request feature. And the process feature is represented by the random, customized and routine processes, while request feature is described by the heavy-tailed ON/OFF source. Our analysis and simulation show that the traffic of our model admits the ubiquitous statistical laws: the self-similarity and the mean-variance relationship, which further validate our model. Moreover, compared with the traffic generation model without considering complex process features, where traffic distribution is found being positively correlated with node betweenness centrality (BC), the traffic of our model is both positively related with node BC, and much higher on nodes in the specific processes. The proposed model is thus beneficial for traffic control and network enhancement with complex process features. 相似文献
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知识流程外包作为知识密集型产业与知识产权密切相关。分析知识流程外包中的知识产权授权主体,提出我国知识流程外包产业中知识产权的授权模式及各模式的选择标准,并对知识流程外包企业——易唯思中国商务咨询有限公司的知识产权授权模式进行了具体剖析。 相似文献
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零售企业竞争优势形成机理的研究 总被引：5，自引：0，他引：5
零售企业竞争优势来源于零售业务流程,零售业务流程特征来源于企业资源,在此基础上建立了一个零售企业竞争优势形成机理的研究模型,并应用这个模型对沃尔玛零售公司的竞争优势进行了案例研究,最后得出结论：沃尔玛竞争优势为天天低价,导致天天低价形成的是一个“低成本采购——低成本配送——低价格销售——低成本采购”的业务流程,这个流程的保障是包括“两系统两关系”的企业资源：物流系统和信息系统;与顾客的亲人关系和与员工的伙伴关系。 相似文献
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This paper presents a conceptual model to explore the knowledge integration (KI) practices of internal and external company actors involved in the New Product Development (NPD) process of the aerospace industry. The model is based on the linkage of elasticity principles, particularly Hooke’s Law, to Knowledge Management theory. KI practices are considered as a force pushing the NPD process and are metaphorically described as the spring addressed by Hooke’s law. The integration of the knowledge of internal and external company actors impacts NPD, reducing the dimensions of the whole process, in terms of phases, through the application of the concurrent engineering approach. The whole NPD process is improved in terms of the reduction of uncertainty and complexity, and with an ‘integrated energy’ that sustains the pressure of the fast-changing competitive environment. The model is explored to provide an interpretation of the conceptualisation phase of a new aerospace product development process. Qualitative data were collected and analysed. Insights regarding the applications of the model and the theoretical implications are also provided for applications in other industries. 相似文献
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基于SWAT的平原圩区受控水文过程识别和模拟 总被引：4，自引：1，他引：3
平原圩区地势平坦,水系结构复杂,汇流和排水过程受到农业水利工程的影响,仅基于DEM提取流域的方法难以使SWAT模型正确识别圩区汇水关系.在充分调查分析平原圩区水文过程的基础上,提出了改进SWAT模型子流域概化方法:①采用分区多出口模拟、水库控制出流等方法以识别平原圩区复杂、受控的水文过程;②基于主要地物要素对原始DEM进行修正,并通过河道结构合理化修正以处理河道分汊和网状河流汇流关系.江西省赣江下游典型平原圩区蒋巷联圩实例研究表明,应用上述强化子流域提取方法,能够使SWAT模型较好地对平原圩区复杂、受控的水文过程进行识别和模拟,水量模拟相关系数和效率系数均达到0.8以上.通过对比自然出流和受控出流的模拟结果和出流特征,表明SWAT模型能够较好地识别平原圩区内电排站对径流的调蓄和截留作用. 相似文献
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《Journal of The Franklin Institute》2002,339(6-7):555-568
Dynamic system with a random structure described by a set of the first-order stochastic differential equations (SDE) is used as a generating model of nonstationary pulse stochastic processes. Physically the system presents the combination of the so-called partial filters related to the isolated states of the considered process, switched by a Poissonian point process and excited by a vector delta-correlated stream of impulses with the randomly distributed energy. The filters’ outputs are components of the vector Markov continuous-jump process with statistics depending on the partial SDEs operators, intensity of switching process and distributions of the exciting impulses’ energies. The approach proposed was used as a simulation model of the Middleton “Class-A “generally non-Gaussian noise. The results demonstrate that the main features of statistical characteristics of the noise envelope are reproduced rather well with the help of a bistate system with random structure. 相似文献
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中国信息技术投资绩效的实证研究 《科学学研究》2015,33(8):1141-1150
信息技术投资绩效应该是一个动态变化的过程,而且受到国家特征的影响,但当前的研究往往忽视了国家特征对信息技术投资绩效的影响。本文在传统局部调整模型的基础上,假设调整速度是动态变动的,且是国家特征的线性函数,提出了一种基于动态调整速度的局部调整模型。该模型可以分析统计期内信息技术投资绩效的动态变化过程,及其与调整速度的关系。结果表明,信息技术投资对中国经济增长的影响并不显著,信息技术作为生产要素进入生产过程后,导致经济绩效的下降,中国存在信息技术的“生产率悖论”现象。 相似文献
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对人工读图的认知过程进行了分析,总结出其自组织的特征,设计了"基于知识的工程图识别层次模型",将整个工程图识别过程分为像素、矢量图元和工程图形三个层次,层次之间相应地进行基于知识的两阶段的矢量化和识别处理,该模型为各种工程知识的使用打下了基础。 相似文献
10.
Fei Chu Xiang Cheng Chuang Peng Runda Jia Tao Chen Qinglai Wei 《Journal of The Franklin Institute》2021,358(1):606-632
The advantages of maximally transferring similar process data for modeling make the process transfer model attract increasing attention in quality prediction and optimal control. Unfortunately, due to the difference between similar processes and the uncertainty of data-driven model, there are usually a more serious mismatch between the process transfer model and the actual process, which may result in the deterioration of process transfer model-based control strategies. In this research, a process transfer model based optimal compensation control strategy using just-in-time learning and trust region method is proposed to cope with this problem for batch processes. First, a novel JITL-JYKPLS (Just-in-time learning Joint-Y kernel partial least squares) model combining the JYKPLS (Joint-Y kernel partial least squares) process transfer model and just-in-time learning is proposed and employed to obtain the satisfactory approximation in a local region with the assistance of sufficient similar process data. Then, this paper integrates JITL-JYKPLS model with the trust region method to further compensate for the NCO (necessary condition of optimality) mismatch in the batch-to-batch optimization problem, and the problem of estimating experimental gradients is also avoided. Meanwhile, a more elaborate model update scheme is designed to supplement the lack of new data and gradually eliminate the adverse effects of partial differences between similar process production processes. Finally, the feasibility of the proposed optimal compensation control strategy is demonstrated through a simulated cobalt oxalate synthesis process. 相似文献
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在回顾以往研究的基础上提出基于应用的专利布局新模式,以及该模式的适用范围和实施策略。并选择JY公司作为研究对象,从技术分析、市场调查、能力匹配、规划布局、实施与调整的全过程详细说明该模式的实施流程和关键步骤,以期丰富企业专利布局模式的相关研究、对同类企业的专利布局提供指导。 相似文献
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The Hammerstein–Wiener model is a nonlinear system with three blocks where a dynamic linear block is sandwiched between two static nonlinear blocks. For parameter learning of the Hammerstein–Wiener model, the synchronous parameter learning methods are proposed to learn the model parameters by constructing hybrid model of the three series block, such as over parameterization method, subspace method and maximum likelihood method. It should be pointed out that the aforementioned methods appeared the product term of model parameters in the process of parameter learning, and parameter separation method is further adopted to separate hybrid parameters, which increases the complexity of parameter learning. To address this issue, a novel three-stage parameter learning method of the neuro-fuzzy based Hammerstein–Wiener model corrupted by process noise using combined signals is developed in this paper. The combined signals are designed to completely separate the parameter learning issues of the static input nonlinear block, the linear dynamic block and the static output nonlinear block, which effectively simplifies the process of parameter learning of the Hammerstein–Wiener model. Parameter learning of the Hammerstein–Wiener model are summarized into the following three aspects: The first one is to learn the output static nonlinear block parameters using two sets of separable signals with different sizes. The second one is to estimate the linear dynamic block parameters by means of the correlation analysis method, the unmeasurable intermediate variable information problem is effectively handled. The final one is to determine the parameters of the static input nonlinear block and the moving average noise model using recursive extended least square scheme. The simulation results are presented to illustrate that the proposed learning approach yields high learning accuracy and good robustness for the Hammerstein–Wiener model corrupted by process noise. 相似文献
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José C. Casillas Francisco J. Acedo José L. Barbero 《International Journal of Information Management》2010
The internationalisation process has been described as a process of learning under which a business increases its commitment abroad as the company acquires knowledge on new markets and on the nature of the process itself. The present work proposes a model that relates the possession of a base of knowledge originated in supra-organisational, organisational and individual sources, as the actively new decision of seeking knowledge related to the start of the exporting activity. Integrating the literature on the pre-export behaviour of the business and the theory of organisational learning, we propose that such relationship is influenced by two dimensions: the export intention and the context of unlearning. The sample included 103 SMEs in the pre-exporting phase. Results support the conception of the process of internationalisation as a process of learning under which a prior base of knowledge is combined with periods of unlearning and a search for new knowledge. 相似文献
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Global software engineering (GSE) has received increased attention, as globalization enables and encourages increased distribution of product development. Many empirical studies and systematic literature reviews (SLRs) focus on the identification of challenges, this paper however presents the first SLR collecting and analyzing solutions associated with GSE, while also evaluating the level of empirical validation of said solutions. As a starting point the paper presents a GSE model, designed to categorize solutions into process areas, useful for the analysis of the research community's contributions to state-of-the-art and identifying fundamental gaps in research. In addition, the model categorizing the solutions is populated with references and good-examples, useful for practitioners, which can use the model to find solutions to overall challenges in various process areas. The overall results of the systematic review revealed more than 330 papers containing 127 solutions that were then identified and mapped to the model. The process areas of project management are highly populated, while other areas like product integration have received surprisingly little attention. In addition, selected process area is elaborated upon in terms of contents and deficiencies. 相似文献
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新制丝加工质量评价模式的设计与应用 总被引：1，自引：0，他引：1
传统制丝加工质量评价模式比较简单,为科学、合理、真实地评价制丝加工质量,设计和应用全新的制丝加工质量评价模式,以MES系统为平台,引入过程能力指数,结合综合质量检验对制丝生产过程工艺质量进行总体评价。新制丝加工质量评价模式的应用为工艺质量评估、诊断和科学决策提供了有力技术支持,也有利于质量持续改进活动的有效开展。 相似文献
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引入工作流对制造企业的质量管理体系进行了分析与研究,建立了制造企业质量管理的过程模型,并以采购质量管理系统为例,基于Petri网构造了其工作流模型;设计开发了基于工作流的计算机辅助质量管理系统,从而实现了过程驱动的质量管理机制,为提升质量管理系统的过程支持能力提供了一种有效的技术方案。 相似文献
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提出基于过程方法的集成制造模式下产品质量形成全过程的系统模型,在建模中融入了工作流的原理和方法,并在此基础上分别从组织模型、功能模型、过程模型、信息模型等方面进行分析和研究.该模型可以解决因业务流程的变更及与其他业务系统的集成而带来的问题,提高了系统的适应性与柔性.通过在某半导体制造企业的质量管理应用实践表明,该模型是可行的. 相似文献
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Beshah Ayalew 《Journal of The Franklin Institute》2019,356(5):2505-2529
This paper presents a robust multivariable predictive control for laser-aided powder deposition (LAPD) processes in additive manufacturing. First, a novel control-oriented MIMO process model is derived. Then, the objective of achieving desired geometrical and thermal properties is formulated as one of generating and tracking nominal reference profiles of layer height and melting pool temperature. This is accomplished via a nonlinear model predictive control with guaranteed nominal stability. Furthermore, a local ancillary feedback law is derived to provide robustness to bounded uncertainties. The paper verifies the effectiveness of the proposed control via a case study on a laser cladding process. 相似文献
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北方农牧交错带生态系统服务合理消耗多主体模型构建 总被引：2，自引：0，他引：2
生态系统服务消耗研究对于生态系统的保护和可持续利用具有重要意义,已成为生态学研究的热点。生态系统服务消耗多主体模型是用于研究生态系统服务消耗,表达生态系统与人类经济系统相互作用关系的适用方法。以内蒙古农牧交错区生态系统服务消耗为例,研究了生态系统服务消耗多主体模型的构建方法,包括调查数据的分析与提取,农牧户及其成员多主体运行规则的研究和制定,生态系统服务压力指数的定义,地理数据的导入及模型运行空间的创建,模型参数选择及其初始化等。模型系统研发及运行结果表明,以本方法构建的生态系统服务消耗多主体模型可以体现生态系统服务消耗的过程,所建立的模型具有可视化、过程可展现、数据分析直观等特点,对研究生态系统服务消耗有一定的应用价值。 相似文献