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1.
Survivability is defined as the capability of a system to fulfill its mission, in a timely manner, in the presence of attacks, or accidents. A key characteristic of survivable systems is their capability to deliver essential services in the face of attack, failure, or accident. Thus, it is important to deliver essential services in the survivability network system. Mobile Agent has a character of motion besides reactive, autonomy and oriented-objective as a new technology. By discussing the characters of survivability network system and mobile agent, this paper presents a model for essential services mobility based on mobile agent-MESMMA. This paper mainly focuses on the design of both MESMMA system and mobile agent inner architecture. 相似文献
2.
In order to solve the problem of software system protection and recovery in large computer laboratory , this paper analyses the current state of software system protection & recovery technology and it's defects in safety and stability. The reason causing these problems are discussed. Some solution plans are suggested.The authors hold that there have two way to solve these problems completely , one is strengthening the support from hardware , particularly strengthening the support to recover card directly from BIOS, another is developing new Host/Terminal computer system , protecting software system by ARC. 相似文献
3.
According to the development trends of modem industrial architecture and combining with the situation of China, the essay first proposes the design strategies of modern industrial architecture in China, and then strongly verifies these strategies with deep analysis of advanced design precedents, in the end points out these strategies are very necessary and appropriate in China. 相似文献
4.
植物在抵抗和适应不良环境时会产生生长缓慢或暂时停顿的休眠现象,打破休眠时所需的有效低温时数称为植物的需冷量。本研究综述了不同需冷量模型并分析了应用情况及效果。Utah模型是目前使用频率较高且效果较好的估算模型,动力学模型是理论最完善且适用范围最广的估算模型,但仍未推广应用,尤其是国内鲜有报道。需冷量估算模型研究对象主要为休眠芽,对其他休眠器官(球根、种子等)的需冷量研究还不多。与果树等其他园艺作物相比,目前将冷量估算模型应用于观赏植物的研究较少,涉及到植物种类和休眠器官类型都较少。需冷量模型与低温小时数相比能更准确计量及预测解除休眠过程对低温的需求,应用于观赏植物品种区域规划、引种有更好的前景。同时,继续探索需冷量累积的过程中相关的生物学机制,优化需冷量模型使其在不同气候类型中的应用具有通用型是未来研究需要着力解决的问题。 相似文献
5.
Isolation technique was not only applied for middle or low buildings, but also recently it was applied to high rise buildings. For high rise buildings, multi order vibration should be considered for upper structure isolation and bend deformation should be taken into account in gross deformation because of large height to width ratio. On the basis of previous studies, calculation method of equivalent model for regular isolated structure with bend shear deformation characteristic was proposed according to equivalent criteria after the analysis for some model structures. With the proposed model, handwork calculation of earquake response for isolated structure can be simply completed and design efficiency of isolation structure was improved. Based on the case studies, the equivalency of proposed model was approved. 相似文献
6.
Response Spectrum Method for Seismic Response Calculation of Pipeline System Multiply Supported on Structures 总被引:1,自引:0,他引:1
In order to ensure the function of building in the earthquake, reduce economic losses and facilitate post-disaster relief, it is necessary to accurately evaluate the seismic performance of pipeline system on the structure under seismic excitation. Considering this practical need, seismic response calculation methods of piping systems on structures were systematically studied. Firstly, theoretical derivation was performed based on the pseudo-excitation method for seismic response of pipeline system. It is found that the formula in previous studies has obvious defect: the accurate relative displacement values of degree of freedom near the supports can not be obtained in the formula. Thereby, the theoretical basis for derivation was mended to correct the defect, and the uniform combination expressions available for pipeline's seismic response calculation which is in the form of ground response spectrum or floor response spectrum were presented. Moreover, the simplified formulas and calculation method of correlation coefficients in the obtained expressions were put forward according to the assumption of white noise earthquake excitation. Finally, case studies were adopted to verify the proposed method's effectiveness and applicability in the seismic response calculation of pipeline system. 相似文献
7.
Because the present Architecture Fireproofing Technique Criterion for Auto-Detection and Alarm Systems in Atria is one with faults, it can't satisfy the needs of practical use. According to the forms of atrium and the characters of gas flow, an Auto-Detection and Alarm System suitable for the atria is investigated. The aim of this paper is to discuss the perfect design method for the Auto-Detection and Alarm Systems in Atria. 相似文献
8.
强化培育人权益保障对于激发培育人科研创新积极性、打造育种自主创新社会氛围和增强中国新品种自主创新能力具有重要意义。在植物新品种保护制度完善中,结合国际趋势,确立培育人概念,重构申请权、品种权归属制度,保护培育人署名权和报酬权。 相似文献
9.
“质量一体化”基本农田保护信息系统实施方案初探
——以新沂市为例 总被引:2,自引:0,他引:2
提出了“质量一体化”基本农田保护信息系统的概念和实施技术要求,以新沂市为例,在对新沂市基本农田保护现状进行调研的基础上,论证了其实施“质量一体化”基本农田保护信息系统的可行性,根据新沂市的实际情况,提出了系统应包含的功能模块、建库方案等,对新沂市实施“质量一体化”基本农田保护信息系统进行有益的探索。 相似文献
10.
TANG Ke-lun~ 《保鲜与加工》2006,(4):83-86
Based on the actual situation that there is shortage of water,existence of many dry ditches,over-use of the underground water and the water pollution in the downtown of Jiaozuo city,in this paper,with comprehensive application of the multi-eco technologies such as comprehensive water-handlings and artificial wetland water purifications,the preservative strategies for the surface water and underground water together are put forward to optimize the water cycling,which can on the one hand reduce the contradictories in the water surroundings of the downtown,and on the other hand improve the landscape of dry ditches and sunk areas. 相似文献
11.
"工学结合"是实现高技能人才培养目标的有效途径。探讨了"工学结合"人才培养模式,研究和实践了食品营养与检测专业"3133"工学结合新模式,从该模式的研究目标和技术路线出发,重点介绍了其研究成果、实践实效和推广效果。实践表明,该模式适应了高职高专的高技能应用型专业人才培养的要求。 相似文献
12.
利用ORYZA2000模型分析北京地区旱稻产量潜力及需水特征 总被引:3,自引:0,他引:3
在模型验证的基础上,利用ORYZA2000模型分析表明,北京地区旱稻产量潜力30年平均为8 573 kg hm-2,变化范围为6 747~11 278 kg hm-2,年际间变异系数为16.3%。而雨养产量的多年平均值为4 084 kg hm-2,变化范围223~8 018 kg hm-2,年际间的变异系数高达51.1%。产量潜力与雨养产量之差表明北京地区旱稻尚有一定的增产潜力。旱稻全生育期需水量的多年平均值为713 mm,年际间变异为8.5%。其中,出苗—穗分化阶段由于持续时间长,需水量最大,占全生育期的49.7%。全生育期的平均需水强度为5.3 mm d-1,需水强度最大的时期为穗分化—开花阶段,平均为5.5 mm d-1。北京地区生育期内的降水量不能完全满足旱稻的需水要求,50%的年份水分亏缺量在250 mm以上,水分亏缺量多年平均值为226 mm,年际间变异较大,变异系数高达81.4%。 相似文献
13.
基于生物量的冬小麦越冬前植株地上部形态结构模型 总被引:1,自引:0,他引:1
越冬前植株地上部形态建成是冬小麦株型构建和可视化的重要基础。为定量分析冬小麦越冬前植株地上部形态结构参数与器官生物量的关系,以济麦22、泰农18和鲁原502为材料,于2013-2014和2014-2015年度开展了品种和施氮试验。利用2013-2014年度越冬前植株地上部形态结构参数和器官生物量等数据构建了冬小麦越冬前植株地上部形态结构模型。经2014-2015年度数据检验,除叶鞘长和叶弦长模型精度略低外,叶长、最大叶宽、叶切角和叶弦角模型精度均较高,所建模型可较好地模拟不同品种与各施氮水平冬小麦越冬前植株地上部形态结构。 相似文献
14.
Electronic business is a model of automation business activities, so the concept of field bus control system that is the latest control technology in automation control domain could be transplanted into electronic business structure to optimize the performance of the electronic business. The author studied the model which had centralize distributed structure and built under the concept of FCS in the environment of electronic business. By analyzing the performance of shops online, authority center and logistics distribution center that have the centralize distributed structure, the conclusions could be drawn that the centralize distributed structure model of electronic business has the advantages of high reliability, rapid response, high expandability, easy to rebuild and high system efficiency that FCS has. 相似文献
15.
Reliability Evaluation Model of Composite Generation and Transmission System Incorporating FACTS Devices 总被引:1,自引:0,他引:1
The utilization of Flexible AC Transimssion System(FACTS)technology has significant impact on power system reliability performance.Series FACTS devices such as Thyristor Controlled Phase Shifting Transformers(TCPSTs) and Thyristor Controlled Series Compensators(TCSCs) can change the natural allocation of the power flow and effectively alleviate transmission congestion.Parallel FACTS devices such as Static Var Compensators(SVCs)can provide reactive power support and maintain voltage stability.So it is important to quantitatively evaluate their benefits to the power system reliability.The traditional models of the composite generation and transmission system reliability evaluation are mainly focused on conventional generation and transmission facilities.This paper researches the power flow model of TCPST and TCSC,and then presents the optimal load shedding model incorporating TCPSTs,TCSCs and SVCs and effectively incorporates them into the reliability evaluation model.The proposed method is tested on the RBTS and the obtained results show that the system reliability can be improved effectually by FACTS devices. 相似文献
16.
中国渔政管理指挥系统是服务于渔业管理业务的大型管理信息系统,随着信息化建设的深入和需求的提高,越来越多的管理业务将纳入到系统中来,系统的运行效率与业务协同性将会面临挑战。笔者通过架构设计关键技术的分析研究,基于企业架构(EA)和面向服务的体系结构(SOA)技术,提出了面向渔业管理的系统架构框架,优化了中国渔政管理指挥系统的总体设计方案。总体设计根据业务需求和管理战略从全局的角度对系统的业务架构、应用架构、数据架构、技术架构进行设计,构建基于SOA的业务服务技术架构,以解决系统的灵活性与可扩展性,满足不断发展的信息化需求,为系统信息共享、互联互通和业务协同提供技术模型,为系统的可持续建设提供技术保障。 相似文献
17.
The Safety Netting Systems has developed products for geotechnical protection works abroad. This article focuses on the concept of The Safety Netting Systems, types, working principle and performance. The Safety Netting Systems has a simple, technologically advanced, safe, reliable, economical and reasonable. The system has been applied in the part of the highway construction. This article discusses the prospects of its application in the highway construction. 相似文献
18.
中国已成为继美国之后的全球第二大能源消费国,能源问题已成为制约一个国家经济发展的首要因素之一。目前,中国在解决能源问题方面,所采取的措施尚不能从根本上解决这一问题。提出能源农业的概念,系统阐述了能源农业的特点以及中国在发展能源农业方面所要采取的能源作物的筛选、培育、标准化栽培管理制度的建设、加工设备和加工工艺、能源转化设备转化效率和转化机制以及区域发展规划制定等一系列的基础及基础应用研究措施。 相似文献
19.
The intelligent building design needs a total new method. It is an integration of electronic technology and other related technologies such as structure, system, service and management ones. As for the architecture design itself, it should include the infrastructure accommodating telecommunication, day lighting, lighting and HVAC systems. At the same time, the security, fire safety and operation controls should be considered as well. 相似文献
20.
Random spectrum excitation samples of a road surface profile are investigated. The displacements, velocities, accelerations of a vehicle and a bridge structure are discussed using certain samples. The road excitations are numerically simulated by the random phase cosine method of the power spectral density. The vehicle bridge system responses are obtained using the vehicle bridge differential equations for different road surface profiles. It is concluded that the random phase has critical effects on the road surface profile curve shape, and the power spectral density on the curve value. The random samples possesses the same statistical characteristics. The system response values are affected more by the road surface profiles, and the response shapes are affected more as the vehicle velocity varies. Some engineering advice is proposed based on the numerical calculation with the different random excitation inputs for their significant differential responses. 相似文献