A novel fractional-order hyperchaotic complex system and its synchronization

A novel fractional-order hyperchaotic complex system is proposed by introducing the Caputo fractional-order derivative operator and a constant term to the complex simplified Lorenz system. The proposed system has different numbers of equilibria for different ranges of parameters. The dynamics of the proposed system is investigated by means of phase portraits, Lyapunov exponents, bifurcation diagrams, and basins of attraction. The results show abundant dynamical characteristics. Particularly, the phenomena of extreme multistability as well as hidden attractors are discovered. In addition, the complex generalized projective synchronization is implemented between two fractional-order hyperchaotic complex systems with different fractional orders. Based on the fractional Lyapunov stability theorem, the synchronization controllers are designed, and the theoretical results are verified and demonstrated by numerical simulations. It lays the foundation for practical applications of the proposed system.

Some remarks on pseudo-umbilical totally real submanifolds in a complex projective space

This paper studies the relationship between the pseudo-umbilical totally real submanifolds and the minimal totally real submanifolds in a complex projective space. Two theo- rems which claim that some types of pseudo-umbilical totally real submanifolds must be minimal submanifolds are proved.

Discrete decision model and multi-agent simulation of the Liang Zong two-chain hierarchical organization in a complex project

Different from the organization structure of complex projects in Western countries, the Liang Zong hierarchical organization structure of complex projects in China has two different chains, the chief-engineer chain and the general-director chain,to handle the trade-off between technical and management decisions. However, previous works on organization search have mainly focused on the single-chain hierarchical organization in which all decisions are regarded as homogeneous. The heterogeneity and the interdependency between technical decisions and management decisions have been neglected. A two-chain hierarchical organization structure mapped from a real complex project is constructed. Then, a discrete decision model for a Liang Zong two-chain hierarchical organization in an NK model framework is proposed. This model proves that this kind of organization structure can reduce the search space by a large amount and that the search process should reach a final stable state more quickly. For a more complicated decision mechanism, a multi-agent simulation based on the above NK model is used to explore the effect of the two-chain organization structure on the speed, stability, and performance of the search process. The results provide three insights into how, compared with the single-chain hierarchical organization, the two-chain organization can improve the search process: it can reduce the number of iterations efficiently; the search is more stable because the search space is a smoother hill-like fitness landscape; in general, the search performance can be improved.However, when the organization structure is very complicated, the performance of a two-chain organization is inferior to that of a single-chain organization. These findings about the efficiency of the unique Chinese-style organization structure can be used to guide organization design for complex projects.

Safety Risk Analysis of Large⁃scale Complex Project based on WBS⁃RBS and Interval Numbers

Safety risks are essential to the success or failure of the large⁃scale complex projects.In order to assess and evaluate the safety risks of the large⁃scale complex projects scientifically,a risk assessment method of work breakdown structure and risk breakdown structure(WBS⁃RBS)is proposed to identify the project risks.In this paper,interval numbers are used to evaluate the risk levels,weights are assigned automatically based on the complexity and risk degree of WBS to distinguish three types of nodes in WBS,and a risk assessment algorithm is designed to assess safety risk at all layers of the project.A case study is conducted to demonstrate how to apply the method.The results show the practicality,robustness and efficiency of our new method,which can be applied to different kinds of large⁃scale complex projects in reality.

Finite-time complex projective synchronization of fractional-order complex-valued uncertain multi-link network and its image encryption application

Multi-link networks are universal in the real world such as relationship networks,transportation networks,and communication networks.It is significant to investigate the synchronization of the network with multi-link.In this paper,considering the complex network with uncertain parameters,new adaptive controller and update laws are proposed to ensure that complex-valued multilink network realizes finite-time complex projective synchronization(FTCPS).In addition,based on fractional-order Lyapunov functional method and finite-time stability theory,the criteria of FTCPS are derived and synchronization time is given which is associated with fractional order and control parameters.Meanwhile,numerical example is given to verify the validity of proposed finite-time complex projection strategy and analyze the relationship between synchronization time and fractional order and control parameters.Finally,the network is applied to image encryption,and the security analysis is carried out to verify the correctness of this method.

A Note on Totally Real Riemannian Foliations with Parallelized Mean Curvature Vectors in a Complex Projective Space

We discussed a totally real Riemannian foliations with parallel mean curvature on a complex projective space.We carried out the divergence of a vector field on it and obtained a formula of Simons’type.

2-Harmonic Totally Real Submanifolds in a Complex Projective Space

In this paper, we discuss the relations between the 2-harmornic totally real submsnifold and the minimal totall real submanifold in the complex protective spsace, and obtain the pinching conductions for the second fundamental form and the Rieci curature of the 2-harmornic totally real submanifold in the complex projective space.

Modified projective synchronization with complex scaling factors of uncertain real chaos and complex chaos

To increase the variety and security of communication, we present the definitions of modified projective synchronization with complex scaling factors （CMPS） of real chaotic systems and complex chaotic systems, where complex scaling factors establish a link between real chaos and complex chaos. Considering all situations of unknown parameters and pseudo-gradient condition, we design adaptive CMPS schemes based on the speed-gradient method for the real drive chaotic system and complex response chaotic system and for the complex drive chaotic system and the real response chaotic system, respectively. The convergence factors and dynamical control strength are added to regulate the convergence speed and increase robustness. Numerical simulations verify the feasibility and effectiveness of the presented schemes.

代建工程项目管理冲突及化解对策研究——以高校实验楼代建项目为例

长期以来代建制在实验楼等复杂个性项目上施行时,存在“冲突频发并需政府干预”的突出问题,代建制要求和现有流程之间的矛盾,使得项目建设中的工作冲突容易演变为利益冲突,妨碍了代建项目有效推进。文章在解析管理冲突及其原因的基础上,尝试对相关工作流程进行合理修正,从而摆脱“冲突解决依赖政府干预”的境况,以期为代建制的深入推广提供参考。

重大工程项目复杂性识别及定量测度

为加强对重大工程项目所具有的显著的复杂性特点的理解与有效度量,突破性建立重大工程项目复杂性定量评价方法,为项目管理人员精准把控项目复杂性提供有效方法。通过文献综述与专家访谈,从理论上明晰重大工程项目及其复杂性的定义与内涵;基于技术-组织-环境(TOE)理论框架识别重大工程项目复杂性评价要素,通过三轮问卷设计形成调查问卷,对回收的94份问卷进行信度、效度检验与因子分析,构建包含3个维度(技术复杂性、组织复杂性、环境复杂性)与17个二级评价指标的重大工程项目复杂性测度体系;基于网络层次分析(ANP)模型计算得出各指标的权重系数,并提出重大工程项目复杂性计算公式,在此基础上进行案例分析。结果表明:通过三层次复杂性管理策略体系,重大工程项目复杂性定量评估使得评价信息来源明晰、准确与可靠,既实现对项目整体复杂性的宏观把控,又有助于明确复杂性管理方案中的重点控制维度及具体措施。

基于复杂系统管理理念的S20北翟路改建方案研究

伴随“乌卡”时代的到来,未来充满不确定性、模糊性、易变性、复杂性等诸多挑战,复杂系统管理理念应运而生,旨在以系统思维,运用相关方法与手段,确保工程项目按时、按质、按量达到预期目标。由于复杂系统管理理念在工程中实践的时间还比较短、案例相对少,大多数工程从业者知之甚少。因此,以复杂工程——上海市外环路北翟路改建项目为载体,运用复杂系统管理理念,探讨其在实际工程的应用,通过ICEDSS(智能综合评价决策支持系统)评估体系,借助NN(神经网络)进行学习,选择出“综合最优解”方案,不仅达到高质量管理该工程的目的,而且将北翟路交叉口早晚高峰期平均拥堵时间降低35%左右、北临空经济示范区车辆通过临虹路以南新增匝道进入快速路网的时间缩短20~30min。

新工科背景下项目型课程体系重构——以工业工程专业为例

高等教育是我国人才培养的主要方式,近年来,以培养新型人才为目标的新工科建设方兴未艾,因此为适应时代的发展,高等教育课程体系重构势在必行。该文以工业工程专业为例,在新工科建设的大背景下,借助复杂网络和项目型教学的方法,对某校工业工程专业课程体系进行分析和重构。首先,构建该专业课程网络模型并绘制加权有向课程网络图;其次,对度值、介数中心性等个体属性和平均聚类系数、密度等整体属性进行计算分析;最后,依据课程网络的相关属性建立3个项目型课程体系。

Mean Curvature Flow of Arbitrary Codimension in Complex Projective Spaces

Recently,Pipoli and Sinestrari[Pipoli,G.and Sinestrari,C.,Mean curvature flow of pinched submanifolds of CPn,Comm.Anal.Geom.,25,2017,799-846]initiated the study of convergence problem for the mean curvature flow of small codimension in the complex projective space CPm.The purpose of this paper is to develop the work due to Pipoli and Sinestrari,and verify a new convergence theorem for the mean curvature flow of arbitrary codimension in the complex projective space.Namely,the authors prove that if the initial submanifold in CPm satisfies a suitable pinching condition,then the mean curvature flow converges to a round point in finite time,or converges to a totally geodesic submanifold as t→∞.Consequently,they obtain a differentiable sphere theorem for submanifolds in the complex projective space.

Complex Modified Projective Synchronization for Fractional-order Chaotic Complex Systems

The aim of this paper is to study complex modified projective synchronization（CMPS） between fractional-order chaotic nonlinear systems with incommensurate orders. Based on the stability theory of incommensurate fractional-order systems and active control method, control laws are derived to achieve CMPS in three situations including fractional-order complex Lorenz system driving fractional-order complex Chen system, fractional-order real Rssler system driving fractional-order complex Chen system, and fractionalorder complex Lorenz system driving fractional-order real Lü system. Numerical simulations confirm the validity and feasibility of the analytical method.

复杂项目系统复杂性构成研究

基于项目复杂性构成相关研究,构建了复杂项目系统复杂性由低到高的四层结构模型,提出了复杂项目系统复杂性的六大构成要素:技术复杂性、组织复杂性、内容复杂性、信息复杂性、目标复杂性、环境复杂性,并分析了各复杂性构成因素的影响因子。在此基础上,构建了复杂项目系统复杂性各构成因素之间的相互依赖关系模型。最后,基于模块化思想提出了复杂项目系统复杂性管理的集成化方法。

大型工程的系统复杂性研究

自然、社会环境的复杂和技术、管理能力不足等使得大型工程建设过程中的复杂性不断增加,传统的项目管理方法已很难具有相应的驾驭能力,有必要运用复杂性科学来重新审视和认识大型工程的建设管理。本文分析了工程和系统之间的紧密联系后,指出大型工程是个复杂系统,同时研究了由于工程价值观多元性、工程开放性、资源整合复杂性以及其它复杂性因素对大型工程系统复杂性的深刻影响。

以复杂适应系统理论探析企业信息系统项目风险

为了规避企业信息系统项目中的风险 ,达到提高信息系统项目成功的目的 ,通过界定企业信息系统项目失败的确切含义以及风险的定义 ,来识别企业信息系统项目中存在的风险 ,并试图利用复杂适应系统理论来分析这些风险之间存在的复杂关系 ,以及可以采取的策略和风险管理过程。为企业信息系统项目风险管理的思维方法提供一种探索。

基于综合集成的重大工程复杂问题决策模式

重大工程日益体现出开放的复杂巨系统特征,重大工程决策问题的跨学科、跨领域、多层次使得重大工程决策过程具有高度复杂性。基于定性定量相结合的综合集成理论思想,分析了重大工程复杂决策问题体系,构建了重大工程复杂问题决策流程,并以港珠澳投融资决策为例,以期为重大工程复杂决策问题提供新的方法体系和理论参考。

复杂产品系统项目的治理结构——基于利益相关者理论的研究

回顾了项目治理理论,并根据利益相关者理论识别复杂产品系统项目的利益相关者,进而对4个典型的复杂产品系统项目的合同签订过程、团队组建、外部环境和项目效益等进行剖析,从中析出具有一般性的复杂产品系统项目的治理结构。研究结果表明:复杂产品系统项目治理模型是由内部治理、外部治理和环境治理组成的,是反映利益相关者的责权划分、参与方式及项目沟通协调的综合治理模型。提出:内部治理反映项目核心利益相关者的领导力;外部治理反映契约关系的作用;环境治理是项目各利益相关者权利的保障。

基于系统动力学方法的工程项目管理

随着建设项目复杂性的不断增加,工程项目管理的工作难度也越来越大。而传统的项目管理者局限于细节问题,忽略了项目实际运行中因素之间的相互作用对项目整体的影响。论文通过系统动力学提供一种自上而下的、从战略层面来描述项目复杂系统的管理方法,与前者相辅相成。在分析系统动力学在工程项目管理中的优势之后,借助一个工程项目管理的实例来对其进行应用。