基于单线模型的交通车载电子地图

针对车载导航系统的需要,提出了一种基于单线模式的车载电子地图模型。该模型采用分层管理,对核心的路网结构采用单折线表示道路,节点表示路口,用形值点表示道路的形状,通过有序节点对和道路对的方式来表示交通限制信息。整个地图数据库可以由节点集、道路集和转弯限制集3个集合来描述实现。该模型可以清晰准确地描述道路网络结构及其相关的交通限制信息。试验表明:这种电子地图能很好地支持寻路以及路径导航功能,存储空间较小,非常适合于车载导航使用。

配合大站快车的单线公交组合调度模型

在给定配车数情形下,考虑站点滞留乘客和服务水平等现实约束因素,以乘客总出行时间最小为第一目标,以极大化企业最大利润为第二目标,本文提出一类配合大站快车的多目标单线组合调度模型,确定大站快车途经站点,并计算全程车和大站快车的发车频率.根据问题特征,引入乘客出行时间价值的概念,利用加权法实施多目标的优化,设计启发式算法求解该问题的非劣解.最后,以某线路为例,探讨了发车频率、折返点位置和费用的关系,并分析了公交服务水平、期望拥挤对调度方案的影响,并与现有单一调度方案进行了比较分析,从而验证模型和算法的正确性和有效性.

Android的进程与单线程模型浅析

Android是基于Linux平台的开源手机操作系统的名称,该平台由操作系统、中间件、用户界面和应用软件组成,号称是首个为移动终端打造的真正开放和完整的移动软件[1]。文章首先大致介绍了Android的单线程模型及其原则。然后通过一个真实案例展示Android的单线程模型下容易犯的错误。最后通过几种正确的方式实现该案例,进一步认识和理解Android的单线程模型及其原则。

城市导航电子地图的道路模型

随着GPS/GIS/GSM车辆导航和监控系统的成熟和普及,导航系统电子地图中的道路数据模型的重要性日益突出。在非导航应用中较少研究的道路交通线模型,在此成了无法回避的且必须理清的问题。本文详细分析了现代城市路口的通行规则,论述了单线模型的缺陷,设计了适用于导航的双线多结点道路模型。

高空高速无人机尾焰红外辐射特性计算研究

尾焰是高空高速无人机红外辐射源的主要组成部分,为了计算高空高速无人机尾焰的红外辐射特性,首先,利用流体仿真软件Fluent对高空高速无人机尾焰的流场进行了数值模拟,在此基础上,利用同时考虑谱线洛伦兹加宽效应和多普勒加宽效应的单线组谱带模型理论SLG以及机体遮挡理论,计算了高空高速无人机尾焰的红外辐射强度;其次,采用倾斜路径传输等效方法计算了大气对红外辐射的透过率;最后,计算并分析了某型高空高速无人机在发动机不同工作状态以及不同方位角和观察仰角条件下经过大气衰减后的红外辐射强度,同时分析了无人机飞行俯仰角对尾焰红外辐射强度的影响。

高空风力发电飞行器类型研究

高空风力发电是一类新的风能转换器。采用系留飞行器,通过一根或多根系留缆绳将飞行器与地面基站相连接,旨在以显着增加的高度中捕获风能,利用机载设备将机械能转化成电能,从而产生可用功率。能够在传统风力涡轮机无法进入的大气层中获取风能,具有较强的经济可行性。飞行器类型是高空风力发电系统的核心。以高空风力发电系统为研究对象,考虑到飞行器不同类型各自的结构特点,存在直径过大,起飞降落过程中不易控制且已有多点质量风筝的数学模型复杂等问题。用适当的假设定义风筝运动,并建立了一个单线风筝模型,通过仿真验证了该风筝模型适应于飞行中航向角,方位角等参数的有效控制。为高空风力发电系统中风筝模型的选择及应用提供了参考。

马克思制度变迁的多样性假设及其例证

本文在对马克思制度变迁多样性假设探讨的基础上讨论了几个例证 ,即亚细亚生产方式的历史变迁、资本主义制度产生基础的东西方差异、俄国公社跨越资本主义制度“卡夫丁峡谷”设想及实现 。

基于P2P技术的负载发生器的设计与实现

首先介绍在基于P2P技术的内容分发网络中设计一个负载发生器的目的及必要性;然后详细阐述其具体实现,介绍了如何在单机上模拟出内容分发网络中的大量节点,及如何模拟节点群之间的P2P协议交互行为;最后通过使用设计的负载发生器对一台实际部署的服务器进行测试,证明该负载发生器的有效性及实用性。

Effect of vertical overturning circulation scale and moist static energy tendency on MJO phase speed

The combined effects of vertical overturning circulation(VOC) zonal length scale and moist static energy(MSE)tendency zonal asymmetry on MJO phase speed were investigated based on diagnosis of ERA-Interim data over a 40-year period(1979-2019).In a key region(80°-100°E),128 MJO events were selected.It was found that the larger the VOC zonal length scale,the faster the MJO eastward propagation.The correlation coefficient between them was 0.52,exceeding the 99% confidence level.A significant positive correlation(0.59) was also identified between the phase speed and MSE tendency zonal asymmetry.A linear regression model based on the aforementioned two parameters was constructed,and the phase speed could be estimated based on the model.The correlation coefficient between the reconstructed phase speed and its observed counterpart was 0.73,exceeding the 99% confidence level with an F-test.A composite analysis of the fast and slow groups indicated that the VOC zonal length scale was modulated by the background state.An El Nino(La Ni?a)-like SST pattern and associated precipitation anomalies promoted a larger(smaller) VOC zonal length scale and thus a faster(slower)propagation speed.A sensitivity test with a reference point in a different longitudinal zone(120°-140°E) was conducted.Again,there were significant relationships between the MJO phase speed and the two parameters.The correlation between the reconstructed and observed phase speed was 0.67,exceeding the 99% confidence level.

Oscillating Solitons for （2＋1）-Dimensional Nonlinear Models

Using extended homogeneous balance method and variable separation hypothesis, we found new variable separation solutions with three arbitrary functions of the （2＋1）-dimensional dispersive long-wave equations, Based on derived solutions, we revealed abundant oscillating solitons such as dromion, multi-dromion, solitoff, solitary waves, and so on, by selecting appropriate functions.

Interface-Optical-Phonon Modes in Quasi-one-dimensional Wurtzite Rectangular Quantum Wires

By employing the dielectric continuum model and Loudon＇s uniaxial crystal model, the interface optical （IO） phonon modes in a freestanding quasi-one-dimensional （Q1D） wurtzite rectangular quantum wire are derived and analyzed. Numerical calculation on a freestanding wurtzite GaN quantum wire is performed. The resulte reveal that the dispersion frequencies of IO modes sensitively depend on the geometric structures of the Q1D wurtzite rectangular quantum wires, the free wave-number kz in z-direction and the dielectric constant of the nonpolar matrix. The degenerating behavior of the IO modes in Q1D wurtzite rectangular quantum wire has been clearly observed in the case of small wave-number kz and Iarge ratio of length to width of the rectangular crossing profile. The limited frequency behaviors of IO modes have been analyzed deeply, and detailed comparisons with those in wurtzite planar quantum wells and cylindrical quantum wires are also done. The present theories can be looked on as a generalization of that in isotropic rectangular quantum wires, and it can naturally reduce to the case of Q1D isotropic quantum wires once the anisotropy of the wurtzite material is ignored.

Coefficient of Partial Correlation and Its Calculation

This thesis offers the general concept of coefficient of partial correlation.Starting with regres-sion analysis,the paper,by using samples,infers the general formula of expressing coefficient of partial correlation by way of simple correlation coefficient.

Drift Intermittent Synchronization and Controllability in a Simple Model

A simple model of three coupled oscillators as an approximation of main modes behaviors in a spatial extended system is proposed. Multi-looping generalized synchronization and drift intermittent lag phase synchronization phenomena are found in this simple model. For a certain of parameters in which chaotic-like intermittent behavior exhibit the amplitudes and phases of three modes are controlled to be synchronized states via coupling them with an external periodic mode.

An Improvement Model Presented to Reduce the Required Time for the Implementation of ERP in the Organization

One of the many issues in utilizing ERP systems in organizations are, in fact, the implementation stage. This study by investigating the common and available methods of implementation, as well as their inefficiencies will provide a new more efficient method. This new method, in fact, will first assess the required time of implementation in each of the units of the organization, and then will take advantage of a spherical model with central core instead of a linear model. These units, with regard to the required time of implementation, will surround this core as in the form of some layers. The circuits are ordered in a way that the further we move from the core towards the external layers, the shorter the required time of implementation will become. This way, the priority of implementing ERP will be assigned with a direction from external layers to internal layers. Eventually, all the experiences of the previous stages will be transferred to the central core, which has the most complexity. Through this method, it is expected that we may prevent the fully parallel issue, which was a dominant and apparent issue in previous models, so that the required time of implementation would decrease.

π-Conjugated Unit-Dependent Optical Properties of Linear Conjugated Oligomers

The optical properties of three linear conjugated oligomers （F-P, F-P-F, and P-F-P-F-P）, where phenothiazine （P） and fluorene （F） groups arrange alternately, are investigated. With the enhancement of the π-conjugated system, their absorption and emission bands both gradually red shift, and their two-photon properties are also improved. Meanwhile, their fluorescence dynamic traces are analyzed with continuous rate distribution model, exhibiting that their decay rates gradually accelerate and the rate distribution width become narrower. The quantum chemical calculation offers their molecular structures and transition mechanism, showing that the enhancement of π-conjugated system should be responsible for tile improvement of two-photon properties.

Linear Programs in Cost Accounting： A Linear Cost Model

This paper aims to find unit cost of a product for firms. It establishes a linear cost model to find unit cost. Linear goal programs assume a direct relationship between independent variable and dependent variable. Dependent variable of linear model is unit cost. Independent variables are cost accounting variables. They are supply cost, labor cost, and administration cost. This study assumes a direct relationship between supply-labor-administration costs and unit cost. Therefore, it establishes a linear cost model. The major research question of this study is to apply linear goal programming to cost accounting. The goal of this linear program is to find unit cost of product. This study uses quantitative method and human capital method. The main research result is linear costing model itself.

月球探测器发动机羽流辐射热流计算

火箭发动机羽流的辐射的计算需要求解气体介质的辐射传递方程(RTE).计算模型中基于单线组(SLG)模型考虑气体组分的光谱特性,并采用离散传递法(DTM)求解RTE,对波长积分得到辐射热流密度.通过对圆柱高温CO2气团辐射热流计算来验证计算程序,然后在流场计算的基础上,计算了月球探测器主发动机和姿控发动机羽流对各部位和仪器的辐射热流密度,根据对不同工况计算结果的分析为探测器的设计提供参考.

Dynamic single-index model for functional data

We propose a new functional single index model, which called dynamic single-index model for functional data, or DSIM, to efficiently perform non-linear and dynamic relationships between functional predictor and functional response. The proposed model naturally allows for some curvature not captured by the ordinary functional linear model. By using the proposed two-step estimating algorithm, we develop the estimates for both the link function and the regression coefficient function, and then provide predictions of new response trajectories. Besides the asymptotic properties for the estimates of the unknown functions, we also establish the consistency of the predictions of new response trajectories under mild conditions. Finally, we show through extensive simulation studies and a real data example that the proposed DSIM can highly outperform existed functional regression methods in most settings.

Study on seismic response control of a single-tower self-anchored suspension bridge with elastic-plastic steel damper

Elastic-plastic steel damper(EPSD) is a new device controlling seismic responses.The mechanical principle of EPSD was presented and a comparison was conducted between the theoretical formulas and finite element(FE) simulation of damper units.The verified force-displacement hysteretic curve of the damper system was obtained with reference to tests.The Nanjing Jiangxinzhou Bridge(NJB) was subsequently taken as the case to investigate the seismic response control effect of EPSDs on single-tower self-anchored suspension bridges.A 3-dimensional FE model of the bridge was established in ANSYS and the dynamic and static analyses of the bridge were conducted,the control effect of EPSDs under different seismic waves was further investigated through nonlinear time-history analysis based on the validated model.Results showed that both the simplified theoretical and FE simulation methods can preferable reflect the mechanical performance of EPSD,and that seismic responses of NJB with EPSDs are better than those with elastic connection device or fluid viscous damper.However,the control effect of EPSDs is influenced by seismic wave characteristics.

Simulation-based simplification of target-mediated drug disposition model of denosumab

Target-mediated drug disposition (TMDD)model is one of the main modeling theories for studying nonlinear pharmacokinetics (PK)ofmonoclonal antibodies.However,there are too many parameters in full TMDD model to be estimated based on limited clinical data,leading to instability of the final model.In the present study,we analyzed the predictive ability and applicability of a simplified quasi-steady state (QSS)model with the assumption that the total target concentration was a constant parameter during treatment with monoelonal antibody in clinical data modeling.Based on the parameters of a published TMDD model of denosumab,simulations were performed at population and individual levels.Then,a simplified TMDD model,QSS model, was used to examine the effects of hypotheses,in which the total receptor concentration was constant or variable on model fit and stability of parameter estimation.Both simulations at the population level and model fit results of simulated individual data showed that at the therapeutic doses,the total receptor concentration had little influence on changes in drug concentration,and the model with constant total receptor concentration had the same predictive power.The validated hypothesis could be applied to clinical trial design and selection of the optimal PK model in the development of monoclonal antibodies.