A Prediction of Network Traffic Flow Based on Lyapunov Exponent

The prediction of network traffic flow is a problem of great significance in the research work of resource allocation and congestion control. Based on this accurate prediction, the scheme of resource allocation and control can easily adapt to dynamic variations of incoming traffic flow. So the goal of optimal network performance is achieved. There are many sorts of traffic flow of self-similarity characteristics in high-speed network, and some research work has showed this self-similarity keeps in close contact with the attractor of chaos system. A rate prediction of self-similar traffic sources in high-speed network is proposed as well as the maximum of predictable time by applying the technology of phase space reconstruction about chaotic time series. This method has a simple prediction mode, and the result of simulations indicates it also has highly accurate results.     

践踏对天然草与人造草混合系统草坪生理的影响

为进一步了解天然草与人造草混合系统草坪的特点,本研究以纯天然草坪为对照,通过模拟践踏处理后,对混合系统草坪几项生理指标进行测定研究。结果表明：轻度践踏胁迫对混合系统草坪细胞质膜透性、叶绿素含量及可溶性糖含量的影响与不践踏时都达不到显著水平,SOD活性与 MDA含量的变化也证实了这一点;而重度践踏在各方面都显著影响草坪草的生长,降低草坪质量;混合系统草坪中天然草受到人造草皮的保护,使草坪质量的稳定性加强,各项生理指标变化幅度降低。但是A2处理的人造草丝密度较大,影响了天然草的正常生长,草坪表观质量也较差;A8处理对天然草的保护作用不明显,与对照A0的差别不大;而A4、A6处理受践踏胁迫影响较小,对于天然草保护作用明显,显著提高了混合系统草坪的耐践踏性。     

Traffic Engineering and Traffic Matrix in IP Backbone Network Based on MPLS

On current network actuality and development trend, it is necessary to put traffic engineering in practice in IP backbone network on IP/MPLS. The essential demand in actualizing traffic engineering is traffic matrix measurement. After analyzing the defect of current measurement method, traffic engineering model and traffic matrix on LSP in IP backbone network based on MPLS, or relevant routing algorithm are researched. The merit of the traffic matrix's measurement method is that implement of measurement is only located in the edge node; therefore, network resource's cost is lower and it offers a new train of thoughts for resolving the flaw of current main measurement methods, moreover, and condition for actualizing traffic engineering.     

Dynamic Route Guidance System Based on Genetic Algorithm

The study on Dynamic Route Guidance System (DRGS) is an important research in the field of Intelligent Transportation System(ITS),which guide the behaviors of travelers by providing them with optimal route based on real-time traffic information. As a result the travel time can be saved and the traffic congestion can be avoided. The route guidance algorithm can compute the best route between the begin point and destination. The globe near best property and real-time property must be considered , the Genetic Algorithm have qualifications for globe optimal and parallel algorithm. Genetic algorithm(GA),for solving the shortest route,is proposed in this thesis?The ordered real code rule,crossover,mutation are given. The efficiency of the GA is proved through an example.     

Campus Traffic Calming: A Case Study of Xipu Campus,Southwest Jiaotong University

With an increasingly number of cars on campus, the campus is faced with challenges of traffic order and safety. This paper, based on traffic calming and practical experience, took the Xipu campus of Southwest Jiaotong University as an example. Grounded on the traffic situation and characteristics of Xipu campus, the study analyzed the concept of traffic calming and its engineering measures, put forward traffic calming design scheme for Qiuhua Road on the Xipu campus with practical application of campus traffic characteristics, and stated the significance of campus traffic calming for its driving effect in creating an atmosphere of "environment cultivation" on campus. Finally, this paper discussed the development and application of traffic calming in China.     

Analysis on the stability of traffic flow with the information of two preceding cars

The stability analysis is one of the important problems in the traffic flow theory, where the congestion phenomena can be regarded as the instability and the phase transition of a dynamical system. An extended optimal velocity model is deduced by considering the effect of the information of two leader cars. The stability condition of the extended model is obtained by using the linear stability theory. The modified Korteweg-de Vries (mKdV) equation is derived to describe the traffic behavior near the critical point by applying the nonlinear analysis. The numerical simulation results demonstrate the analytical results and show that the traffic congests are suppressed more efficiently by considering two vehicles ahead. Therefore, the next-nearest-neighbor car has strong effects on traffic dynamics and plays an important role on stabilizing the traffic flow.     

Spatial Distribution of Natural Villages Surrounding Plateau Lakes: A Case Study of the Yilong Lake in Yunnan

The study of the spatial distribution of natural villages is what local studies, cultural studies, urban and rural planning, and tourism planning need. In the context of gradually extinct natural villages, research on the characteristics analysis and protection of natural villages is of great significance. With the aid of the Arc GIS spatial analysis technology, it was concluded that terrain, traffic, and social economy were important factors influencing the distribution of the natural villages in the study area, so as to provide a technical reference for relevant local administrative departments to construct a livable ecological environment.     

Improved Vehicle Detection Algorithm Based on Edge Information

Collecting real-time traffic flow information is a foundational function in intelligent transportation systems. Video based traffic monitoring system has advantage of installation and maintenance, so it iswidely used for traffic monitoring on main road and crossroad. Shadows result from roadside building or trees are one of the factors that arise errors in video based vehicle detection. An improved method based on edge information is proposed for vehicle detection and shadow rejection. Finally vehicle counting is achieved based on the edge detection method.     

Traffic Impact Evaluation System of City Building Projects

Lots of city building projects will consequentially affect the usual traffic, now, with the development of economic in our country, the city traffic will endure more and more pressure, so it is important and necessary to evaluate the traffic impact during the stage of program. Through the analysis about the traffic impact in our country, this article takes use of the "district-road network" theory to evaluate traffic, and at last come into being a traffic impact evaluation system based on software, finishes the basic function of traffic impact evaluation.     

Application of Common Poisonous Garden Plants in Kunming City

This study made a survey and an analysis by taking 46 kinds of common poisonous garden plants in Kunming City as research objects.The results showed that 79.84%of the poisonous plants in Kunming were not used frequently,and the application area was concealed,or there were warning signs and 20.16%of the common poisonous plants were used frequently,and there were potential safety hazards.There are following suggestions:Adjusting the application sites of some garden plants with high ornamental value but poisonous according to their toxicity and setting up warning signs to better embody their ornamental value while ensuring people’s safety.     

Study and Implementation of Traffic Generator in IP Network

According to the simulation results, the factors causing the forming of self-similarity in IP network is presented. Through analysis based on ON/OFF model, we show the influence of traffic source integration level on self-similarity degree. Using the above results, an IP network traffic generator is implemented. Tests in real environment show that the generator can better reflect the relationship of file sizes, protocol types, ON/OFF residence time, traffic source integration levels and self-similarity degrees.     

Key Technology of Intelligent Transportation System-Electronic Map

It's recognized that Automobile Intelligent Transportation System (ITS) is the most effective method to solve the modern traffic problems. ITS is the direction 21st century traffic goes on. It will stimulate more environmental protection, more effective and safer traffic and transport. Electronic Map (EM) plays a very important role on ITS. And it influences the success of ITS directly. The basic conception of EM, functions of EM on ITS, the characteristics of EM in ITS and the ways to get the information of EM are introduced.     

生物质-垃圾混合燃烧特性及其环境分析

由于生物质-垃圾混合燃烧可以明显提高垃圾入炉热值、并缓解生物质露天无序燃烧所造成的大气污染和交通安全威胁等,因此逐渐成为国内外研究的重点。但是生物质掺烧的同时也带来了结渣加剧、腐蚀增强和PM10、二噁英排放量增大等问题。本文针对生物质的特点及其与垃圾混燃过程中产生的环境问题进行分析,对生物质掺烧进行综合的评价和认识。     

Analysis on Effect of Traffic Loads on Landslide Stability

In the design of landslide control engineering,the effect of traffic loads has not been taken into account.The authors simplified the traffic loads as mobile dead loads and traffic dynamic load.The mobile dead load ranges from 2.34 to 6.41 kPa.The impact coefficient was chosen to denote the traffic dynamic load and ranges from 0.1 to 0.4.Using several stability analysis methods widely accepted by engineers,combining two analysis samples,by the contrast of stability tests with and without consideration of the mobile dead load or the traffic dynamic load,the authors found that when the traffic load is not taken into account,the stability coefficient of shallow layer landslide(<8m) is overrated by 4.3-11 percent or 5.8-12.1 percent in comparison with the case when the mobile dead load or traffic dynamic is taken into account respectively,that is,the influence of mobile dead loads and traffic dynamic load is cannot be neglected.In case of medium deep layer landslide or the road is passing through the anti sliding section,the influence of the traffic load is a little and can be neglected.     

基于定量模型下的山东省土地利用变化研究

为分析山东省土地利用变化格局,以期为土地管理决策、生态环境保护和社会经济协调发展提供科学依据,利用山东省1997—2008年各市土地利用详细变更数据,选取农耕用地、牧草用地、园林用地、水域用地、城乡居住及工矿用地、交通用地和未利用土地等7种土地利用类型,在定量模型支持下对山东省不同时段及其内部不同区域土地利用类型变化格局进行了模拟和分析。结果表明：1997—2008年,山东省未利用地、耕地减少幅度较大,水域用地面积增长最显著;土地利用类型变化动态度为0.96%;水域、交通用地、未利用地变化较为显著,其变化动态度分别为25.85%、2.26%和-2.14%。此外,各市耕地、园地、未利用土地和牧草地的相对变化率相距悬殊,证明山东省土地利用类型变化具有显著的区域性差异。该研究揭示了山东省土地利用变化的时空特征,对土地可持续利用、生态农业建设与人地协调发展具有重要意义。     

光谱反射在草坪草胁迫研究中的应用及前景

简述了光谱反射法的原理和特性,归纳了草坪草胁迫研究中常用的光谱反射指标,并着重分析了该方法在草坪草病虫害、干旱、践踏、营养、盐分等胁迫研究中的应用现状,认为该方法能快速、简单、精确的鉴定草坪草胁迫状况,是评估草坪草生理状态、预测其营养状况等的一种非常有效的分析手段,指出其在草坪胁迫研究中有广泛的应用前景。此外,还总结了光谱反射数据的转换和平滑处理方法,指出光谱反射数据的合理处理对相关性分析及预测模型建立的重要性,以期为国内草坪草生理研究者和草坪管理者提供一个新的方法和思路。     

An application of video motion detection technology in city traffic management

For city traffic management, an underground induction winding is used to identify vehicles inside the red light forbidden zone in most computer monitoring systems at traffic lights. We described how to apply video motion detection (VMD) technology in these computer surveillance systems instead of underground induction windings. Using VMD eliminates the underground induction windings that damage road surfaces. The possibility of applying and implementing VMD technology with supporting hardware was analyzed. We described how to develop the program to record automatically those vehicles that violate traffic rules at traffic lights, and to obtain the traffic status of and evidence about those vehicles.     

考虑预估驾驶行为的跟驰模型及其稳定性分析

在OV模型的基础上,进一步考虑预估驾驶行为对车流的影响,提出一个新的跟驰模型以获得预估驾驶行为与交通拥堵的关系。通过对新模型进行稳定性分析得到了系统的临界稳定条件。数值仿真结果表明：新模型能够模拟诸如时停时走、系统临界相变等实际交通现象,较OV模型更贴近于实际。同时,预估驾驶行为增强了交通流稳定性能,提高了车流陷入交通阻塞状态的阈值。最后以车速的平滑度和波动幅度最小为评价指标得到了新模型中预估参数的最优取值范围。     

门头沟新型乡村旅游市场研究

近年来,随着收入、闲暇时间的增多,城市生活节奏的加快以及竞争的日益激烈,人们渴望能从优美的环境中放松、休闲。于是,回归自然的乡村旅游就成为了人们最好的选择。采用市场调研的方法,选取门头沟各乡镇的乡村旅游作为研究对象,重点对门头沟乡村旅游市场进行了调研和分析。经过对门头沟乡村旅游经营方和消费者的实地调研。SPSS分析的结果显示,尽管随着近几年乡村旅游的发展和游客不断成熟和个性化,门头沟乡村旅游也得到了一定的发展,但是,门头沟乡村旅游基础设施和道路交通条件差、乡村旅游产品单一、宣传力度不够、筹集资金渠道狭窄、游客满意度有待提高等因素,致使门头沟乡村旅游发展还不完善。针对制约门头沟乡村旅游发展的因素,从文化创意的角度研究门头沟乡村旅游,旨在把门头沟乡村旅游的资源优势转变为经济优势,促进门头沟乡村旅游的转型升级。     

From Lujiazui in Shanghai to New East Area in Chongqing--An exploration on Urban Land Use Form Oriented by the Public Traffic

To develop the public traffic and setup a city form coordinated with the development of the public traffic has become a common sense in the full achievement of the city sustainable development. Due to the particularity of the exploration procedure and some difficulties in urban development, the policy on developing public traffic has not been realized in our country. Now it is on edge to solve these problems, particularly in the new area of development. In this article, the authors intend to find a practical way of establishing a ciity development mode with adapting the public traffic development by contrasting Lujiazui new area in Shanghai and the new east area in Chongqing.