Nonholonomic Theory of Principal-direction Orthonormal Basis for a Layer of Surfaces

In order to carry out tensor analysis in a neighborhood of a reference surface,the principal-direction orthogonal basis accompanying with Lame s coefficients or general curvilinear coordinate systems are widely used.A novel kind of field theory termed as the nonholonomic theory of the Principal-Direction Orthonormal Basis(PDOB)is presented systematically in the present paper,in which the formal Christoffel symbols are related directly to the principal and geodesic curvatures with respect to the principal directions of the surface.Furthermore,a systematic and simple way to determine the curvatures of the surface are presented with some examples.It provides a way to recognize qualitatively the bending property of a surface.

Incentive mechanism analysis of information security outsourcing based on principal-agent model

In order to solve principal-agent problems caused by interest inconformity and information asymmetry during information security outsourcing, it is necessary to design a reasonable incentive mechanism to promote client enterprises to complete outsourcing service actively. The incentive mechanism model of information security outsourcing is designed based on the principal-agent theory. Through analyzing the factors such as enterprise information assets value, invasion probability, information security environment, the agent cost coefficient and agency risk preference degree how to impact on the incentive mechanism, conclusions show that an enterprise information assets value and invasion probability have a positive influence on the fixed fee and the compensation coefficient; while information security environment, the agent cost coefficient and agency risk preference degree have a negative influence on the compensation coefficient. Therefore, the principal enterprises should reasonably design the fixed fee and the compensation coefficient to encourage information security outsourcing agency enterprises to the full extent.

Exploration on the Incentive Mechanism of Regional Ecological Capital Operation from the Perspective of Principal Agent

Ecological capital operation is a major means for innovation of ecological environment protection,and provides ecological security for sustainable economic and social development.In this paper,key factors for construction of incentive mechanism of ecological capital operation are explored from government cognition,enterprise attitude and public awareness.Via model building and parameter setting,incentive mechanism system of single objective is established effectively,to promote effective realization of regional ecological capital operation.

Optimization of Structure of Agricultural Insurance Subsidies:A Multi-task Principal Agent Model

Optimizing the structure of agricultural insurance subsidies is of great significance to increasing the supply of agricultural insurance and strengthening the effects of agricultural insurance policies.This paper optimized the structure of agricultural insurance subsidies.It decomposed insurance activities into three parts:underwriting,claim settlement,and agricultural services.Next,it incorporated adverse selection risks,moral hazards,agricultural production and operation risks,insurance company's behavioral decisions and its risk attitudes into the multi-task principal agent analysis framework.Finally,it discussed how the government designs a subsidy mechanism and adjusts the subsidy structure to increase the insurance supply.

SCM Implementation Decisions of Principal-Agent under Asymmetric Information

The optimization investment policy decision of SCM-Supply Chain Management-implementation has been analysed under symmetric and asymmetric information conditions. For both conditions, SCM implementation options’ decision optimizing models have been developed. In these models, both clients and vendors try to pursue their own benefits. Based upon the principal-agent theory, the models show to what extent a principal (a client) needs to pay more to an agent (a vendor) in a context of asymmetric information. For the client, it is important to understand the extra costs to be able to adopt effective strategies to stimulate a vendor to perform an optimal implementation of a SCM system. The results of a simulation experiment regarding SCM implementation options illustrate and verify the theoretical findings and confirm the general notion that the less informed party is obliged to pay information rent to the better-informed party.

Close-in weapon system planning based on multi-living agent theory

The close-in weapon system(CIWS)is a combat system that faces a complex environment full of dynamic and unknown challenges,whose construction and planning require a systematic design method.Multiliving agent(MLA)theory is a methodology for the combat system design,which uses the livelihood degree to evaluate the multi-dimensional long-term operational effectiveness of the system;whereas,there is still no uniform quantization framework for the livelihood degree,and the adjustment methods of livelihood degree need to be further improved.In this paper,we propose the uniform quantization framework for the livelihood degree and detailed discuss the methods of livelihood adjustment.Based on the MLA theory,the multi-dimensional operational effectiveness of the missile-gun integrated weapon system(MGIWS)is analyzed,and the long-term combat effectiveness against the saturation attack is assessed.Furthermore,the planning problem of the equipment deployment and configuration is investigated.Two objectives,including the overall livelihood degree and cost-effectiveness(CE),are proposed,and the optimization method based on genetic algorithm(GA)is studied for the planning problem.

Immune multi-agent model using vaccine for cooperative air-defense system of systems for surface warship formation based on danger theory

Aiming at the problem on cooperative air-defense of surface warship formation, this paper maps the cooperative airdefense system of systems （SoS） for surface warship formation （CASoSSWF） to the biological immune system （BIS） according to the similarity of the defense mechanism and characteristics between the CASoSSWF and the BIS, and then designs the models of components and the architecture for a monitoring agent, a regulating agent, a killer agent, a pre-warning agent and a communicating agent by making use of the theories and methods of the artificial immune system, the multi-agent system （MAS）, the vaccine and the danger theory （DT）. Moreover a new immune multi-agent model using vaccine based on DT （IMMUVBDT） for the cooperative air-defense SoS is advanced. The immune response and immune mechanism of the CASoSSWF are analyzed. The model has a capability of memory, evolution, commendable dynamic environment adaptability and self-learning, and embodies adequately the cooperative air-defense mechanism for the CASoSSWF. Therefore it shows a novel idea for the CASoSSWF which can provide conception models for a surface warship formation operation simulation system.

Retrospective and prospective review of the generalized nonlinear strength theory for geomaterials

Strength theory is the basic theory for calculating and designing the strength of engineering materials in civil,hydraulic,mechanical,aerospace,military,and other engineering disciplines.Therefore,the comprehensive study of the generalized nonlinear strength theory(GNST)of geomaterials has significance for the construction of engineering rock strength.This paper reviews the GNST of geomaterials to demonstrate the research status of nonlinear strength characteristics of geomaterials under complex stress paths.First,it systematically summarizes the research progress of GNST(classical and empirical criteria).Then,the latest research the authors conducted over the past five years on the GNST is introduced,and a generalized three-dimensional(3D)nonlinear Hoek‒Brown(HB)criterion(NGHB criterion)is proposed for practical applications.This criterion can be degenerated into the existing three modified HB criteria and has a better prediction performance.The strength prediction errors for six rocks and two in-situ rock masses are 2.0724%-3.5091%and 1.0144%-3.2321%,respectively.Finally,the development and outlook of the GNST are expounded,and a new topic about the building strength index of rock mass and determining the strength of in-situ engineering rock mass is proposed.The summarization of the GNST provides theoretical traceability and optimization for constructing in-situ engineering rock mass strength.

Estimation of Return Level for Maximum Daily and Hourly Precipitation in Nagano Prefecture, Japan, Using the Extreme Value Theory

The weather in Nagano Prefecture, Japan, can be roughly classified into four types according to principal component analysis and k-means clustering. We predicted the extreme values of the maximum daily and hourly precipitation in Nagano Prefecture using the extreme value theory. For the maximum daily precipitation, the vales of ξ in Matsumoto, Karuizawa, Sugadaira, and Saku were positive;therefore, it has no upper bound and tends to take large values. Therefore, it is dangerous and caution is required. The values of ξ in Nagano, Kisofukushima, and Minamishinano were determined to be zero, therefore, there was no upper limit, the probability of obtaining a large value was low, and caution was required. We predicted the maximum return levels for return periods of 10, 20, 50, and 100 years along with respective 95% confidence intervals in Nagano, Matsumoto, Karuizawa, Sugadaira, Saku, Kisofukushima, and Minamishinano. In Matsumoto, the 100-year return level was 182 mm, with a 95% CI [129, 236]. In Minamishinano, the 100-year return level was 285 mm, with a 95% CI [173, 398]. The 100-year return levels for the maximum daily rainfall were 285, 271, and 271 mm in Minamishinano, Saku, and Karuizawa, respectively, where the changes in the daily maximum rainfall were larger than those at other points. Because these values are large, caution is required during heavy rainfall. The 100-year return levels for the maximum daily and hourly precipitation were similar in Karuizawa and Saku. In Sugadaira, the 100-year return level for a maximum hourly rainfall of 107.2 mm was larger than the maximum daily rainfall. Hence, it is necessary to be careful about short-term rainfall events.

Theory of Flexural Shear, Bending and Torsion for a Thin-Walled Beam of Open Section

Aspects of the general Vlasov theory are examined separately as applied to a thin-walled channel section cantilever beam under free-end end loading. In particular, the flexural bending and shear that arise under transverse shear and axial torsional loading are each considered theoretically. These analyses involve the location of the shear centre at which transverse shear forces when applied do not produce torsion. This centre, when taken to be coincident with the centre of twist implies an equivalent reciprocal behaviour. That is, an axial torsion applied concentric with the shear centre will twist but not bend the beam. The respective bending and shear stress conversions are derived for each action applied to three aluminium alloy extruded channel sections mounted as cantilevers with a horizontal principal axis of symmetry. Bending and shear are considered more generally for other thin-walled sections when the transverse loading axes at the shear centre are not parallel to the section = s centroidal axes of principal second moments of area. The fixing at one end of the cantilever modifies the St Venant free angular twist and the free warping displacement. It is shown from the Wagner-Kappus torsion theory how the end constrained warping generates an axial stress distribution that varies with the length and across the cross-section for an axial torsion applied to the shear centre. It should be mentioned here for wider applications and validation of the Vlasov theory that attendant papers are to consider in detail bending and torsional loadings applied to other axes through each of the centroid and the web centre. Therein, both bending and twisting arise from transverse shear and axial torsion applied to each position being displaced from the shear centre. Here, the influence of the axis position upon the net axial and shear stress distributions is to be established. That is, the net axial stress from axial torsional loading is identified with the sum of axial stress due to bending and axial stress arising from constrained warping displacements at the fixing. The net shear stress distribution overlays the distributions from axial torsion and that from flexural shear under transverse loading. Both arise when transverse forces are displaced from the shear centre.

THE GENERAL STRESS STRAIN RELATION OF SOILS INVOLVING THE ROTATION OF PRINCIPAL STRESS AXES

In the light of matrix theory, the character of stress increment which causes the rotation of principal stress axes is analysed and the general stress increment is decomposed into two parts: coaxial part and rotational part. Based on these, the complex three dimensional (3-D) problem involving the rotation of principal stress axes is simplified to the combination of the 3-D coaxial model and the theory about pure rotation of principal stress axes that is only around one principal stress axes. The difficulty of analysis is reduced significantly. The concrete calculating method of general 3-D problem is provided and other applications are also presented.

面向Agent的软件工程:现状与挑战

面向Agent软件工程是近年来软件工程领域出现的一个重要的前沿研究方向,它试图将Agent理论和技术与软件工程的思想、原理和原则相结合,从而为基于Agent系统的开发提供工程化手段.近年来,随着Internet上的Web应用以及软件开发社会化的发展,面向Agent软件工程受到了学术界和工业界的高度关注和重视,研究活跃,发展迅速.从应用需求和技术发展两个方面阐述了面向Agent软件工程的产生和发展背景;从技术、管理和工具3个视点综述了现阶段面向Agent软件工程的研究内容;分析了面向Agent软件工程的研究现状;最后讨论了它存在的问题和面临的挑战以指导进一步研究.

多Agent系统的理论、技术及其应用

一、引言分布式人工智能(DAD主要研究在逻辑上或物理上分散的智能系统如何并行地,相互协作地进行问题求解。DAI是在传统AI的基础上发展起来的,分为分布式问题求解(DPS)和多Agent系统(MAS)两个方向。多Agent系统被看成是人工智能的实验平台,成为AI的研究热点之一。

一个刻画Agent自主性的框架

自主性是agent最显著的特征 ,为了在理论上指导自主agent的设计和构造 ,促进基于agent的软件系统的开发 ,建立了一个刻画agent自主性的框架 .首先 ,在分析现有的agent自主性定义的基础上 ,总结了自主agent应具备的最小能力需求 ;然后 ,介绍用于描述agent的语言 ,agent的心智状态及其表示 ;在此基础上 ,提出一个自主agent的框架 ;最后 。

一种基于agent协调的两路口交通控制方法

智能体(agent)技术是近年分布式人工智能领域的研究热点,文章将其应用到城市交通信号控制领域中.在以Q-学习方法实现单路口信号控制的基础上,采用对策论与社会规则相结合的方法实现了两个路口控制agent(TSCA)间的协调问题.通过在仿真环境下的对比,证明采用该协调方法是有效的.

一种基于博弈论的多Agent交互模型

在开放的、动态的多Agent系统(MAS)中,交互是最基本的方面,具有各自利益的多个Agent必须对其目标、资源的使用进行协调。博弈论为协调和协作的研究奠定了坚实的数学基础,把博弈论与多Agent交互相结合是目前DAI研究的新发展方向。该文提出了一种基于博弈论的多Agent交互模型(GMAIM),应用于解决不完全信息的分布式环境下多人协商决策问题,实现了在会议调度系统(MSS)中的应用。

稳定的有领航者的多移动agent群集运动控制

对具有二次积分动态的多移动agent跟随领航者(Leader)取得群集(Flocking)运动编队进行了研究.提出了一个分散控制方法对多移动agent进行分散控制,并通过理论证明得到以下主要结论:a.所有agent速度方向收敛到同一方向并与领航者保持一致;b.所有agent速度大小收敛并与领航者相同;c.互连的agent之间没有碰撞发生;d.所有agent的人工势场函数被最小化.用图论模型表示agent之间的相互作用及通信关系,对固定的网络拓扑,控制互连拓扑是固定的、时不变的,运用传统的李亚普诺夫理论进行了稳定性分析.最后,给出了一个计算机仿真例子对所得结论进行了验证.仿真结果表明,控制策略可以保证所有agent的速度大小和方向收敛到与Leader保持一致,同时避免碰撞,并保持一个紧凑的编队.

思考型Agent的基本结构

描述了Agent基本特性 ,提出了三类Agent基本结构 ,指出思考型Agent结构是Agent研究的基础和重点 .在分析思考型Agent抽象结构的基础上 ,重点讨论了基于经典逻辑的Agent结构、基于决策理论的Agent结构和基于BDI框架的Agent结构 ,对其进行抽象的形式描述 ,分析其优缺点 。

Agent的意图模型

意图是 Agent的一个不可缺少的意识属性 ,在决定理性 Agent的行为时起着重要的作用 .已经有了若干种基于正规模态逻辑的意图模型 ,但它们存在着严重的“逻辑全知”问题 .该文阐明意图不是正规模态算子 ,并提出了另一种意图模型 ,它不存在“逻辑全知”问题和其他相关问题 (例如 ,副作用问题等 ) .这种意图模型与Konolige和 Pollack的意图模型相比 ,比较简单、自然 ,且满足 K公理和联合一致性原理 ,实际上 。

基于Multi-Agent的航空集群系统重构机理研究

集群作战是未来空中作战的主要样式,其重构机理的研究对于提升航空集群执行任务的整体性能以及在遭受攻击时的生存能力具有重要作用。从作战任务层面出发,对集群系统重构的定义以及类型、触发机制和基本原则进行了分析阐述;借鉴博弈论理论,将航空集群系统分布式重构问题映射为多Agent之间的合作-竞争问题,建立了基于Multi-Agent的系统重构模型,给出了重构的流程与算法,为航空集群系统自适应重构能力的设计实现提供了理论技术支持。