多业务蜂窝移动通信系统中发起呼叫排队的理论分析及其对切换优先算法的性能改善

分析了切换优先级算法中发起呼叫排队的可行性和具体算法流程,并比较了使用发起呼叫以排队前后的切换算法的性能改善。一般的文献里都没有时始发呼叫加以排队,但实际上用户为了接通一个呼叫总是会等待一段时间,这就给了始发呼叫排队的可能。提出了一种符合实际的丢失呼叫限制等待(LCLW)模型,给出了它的流程图并将其应用到混合切换优先级算法中。最后分析了在多业务蜂窝系统中发起呼叫排队对切换指标的性能改善,并加以模拟。从模拟结果中可以看出发起呼叫排队后算法性能得到了较好的改善,呼叫阻塞率大大降低,而且对切换阻塞率并无大的影响。     

Empirical study on entropy models of cellular manufacturing systems

From the theoretical point of view,the states of manufacturing resources can be monitored and assessed through the amount of information needed to describe their technological structure and operational state.The amount of information needed to describe cellular manufacturing systems is investigated by two measures:the structural entropy and the operational entropy.Based on the Shannon entropy,the models of the structural entropy and the operational entropy of cellular manufacturing systems are developed,and the cognizance of the states of manufacturing resources is also illustrated.Scheduling is introduced to measure the entropy models of cellular manufacturing systems,and the feasible concepts of maximum schedule horizon and schedule adherence are advanced to quantitatively evaluate the effectiveness of schedules.Finally,an example is used to demonstrate the validity of the proposed methodology.     

Dynamic modeling of cellular response to DNA damage based on p53 stress response networks

Under acute perturbations from the outside, cells can trigger self-defensive mechanisms to fight against genome stress. To investigate the cellular response to continuous ion radiation (IR), a dynamic model for p53 stress response networks at the cellular level is proposed. The model can successfully be used to simulate the dynamic processes of double-strand breaks (DSBs) generation and their repair, switch-like ataxia telangiectasia mutated (ATM) activation, oscillations occurring in the p53-MDM2 feedback loop, as well as toxins elimination triggered by p53 stress response networks. Especially, the model can predict the plausible outcomes of cellular response under different IR dose regimes.     

基于扩展的生命机制概念的城市土地利用演变CA模拟

城市土地利用演化的实质是人为干预下城市生态景观的自组织机制作用过程,自组织机制的渐变特征与人为干预的突变特征共同演绎了城市土地利用演化永无止境的运动轨迹。城市生态机制理论充分考虑了城市生态景观、自组织机制和人为干预调控等因素,提出了城市土地利用演化的“生命机制”和“欲望”等概念,比较真实自然地反映了城市土地利用演化的实质。但地理特征CA的建模思想中邻居模型过于简单,对宏观因素和微观因素的综合影响考虑不足,也未考虑元胞自身扩展能力的变化和城市发展中的随机现象,元胞转换规则也趋于全局统一,缺乏局部修正能力。将依据城市生态机制理论,借助欲望等概念,引入基于焦点引力和属性的邻居模型,并在原转换规则的基础上加入了对元胞自身扩展能力的变化以及多约束因素综合作用的支持,也考虑了城市因素发展过程中的随机现象,并尝试引入微观因素对元胞转换规则进行局部修正是以使转换规贝4更趋于真实,最后对原有理论的欲望数组结合本文数据特点进行了修正并运用GIS技术对理论框架进行了实现,并将之应用到深圳特区城市土地演变研究中。     

基于SLIP服务器的CDPD MES应用程序接口的实现

ＣＤＰＤ（ 蜂窝数字分组数据）的一个主要目标是提供与现有网络和应用的兼容性。提出了一种基于ＳＬＩＰ（ 串行线ＩＰ） 服务器的应用程序接口（ＡＰＩ） 实现方法,这种方法使得ＣＤＰＤ的移动应用子系统可以与基于ＴＣＰ／ＩＰ（ 传输控制协议／ 网间协议） 的现有网络和应用程序兼容     

V-42bis在DSP中的实现

研究了ＣＤＰＤ（ 蜂窝数字分组数据） 系统中的Ｖ－４２ｂｉｓ 信源数据压缩方案,并针对ＤＳＰ（ 数字信号处理器） 的特性,提出了Ｖ－４２ｂｉｓ 在ＤＳＰ上实现的数据结构和相应算法。在占用内存空间和压缩字典维护两方面取得了良好的效果     

人工细胞神经网络(CNN)的硬件实现

本文主要研究用集成运放实现人工细胞神经网络(CNN)的问题,改进了由L.O.Chua(蔡少棠)提出的单细胞人工CNN电路。从巳实现的4×4CNN电路及CNN连通片检测电路看,其性能达到了预期要求。     

标准元胞自动机模型的缺陷及拓展研究

具备时空计算特征的元胞自动机模型（CA）与GIS集成将极大促进GIS对地理过程的模拟能力。标准元胞自动机在元胞形态、邻居规则等方面的定义存在极大限制，制约了元胞自动机对真实世界的模拟和应用能力。论文充分研究了空间模型与元胞邻居描述的关系，发现元胞邻居在空间关系上存在拓扑邻接、空间邻近和复杂相离三种关系，传统思路的模型扩展很难完全解决CA的局限性，尤其是复杂相离关系。为此，论文在面向对象的思想基础上提出了基于地理实体的元胞自动机概念模型。     

Prediction of grain structure in direct-chill cast Al–Zn–Mg–Cu billets using cellular automaton-finite element method

A cellular automaton-finite element(CA-FE) model was used to predict the solidification grain structure of permanent mold cast A7086 alloy. In this model, a Gaussian distribution of nucleation sites was adopted, and the Kurz-Giovanola-Trivedi model was extended to a multicomponent Al–Zn–Mg–Cu alloy system to determine the growth kinetics of the dendrite tip. For describing the Gaussian distribution of nucleation sites on the mold surface, an empirical relationship between the initial cooling rat...     

Multi-agent based modeling and simulating for evacuation process in stadium

A multi-agent evacuation model is proposed in this paper to simulate the pedestrian evacuation process in stadium with or without obstacles. The authors give a multi-agent individual decisionmaking framework, in which the action direction of each pedestrian （called agent） is affected by the distance of the agent to the exits and the occupant number and density within the view field of the agent. Different from the existing results, the authors divide all the pedestrians in the stadium into four classes： Young male, young female, old male, and old female. In evacuation process, the weighting that affects individual decision-making between each class of agents is different. In the simulation, the authors present the effects of obstacles, crowd distribution and the exit position in evacuation process. Simulation results show that the proposed model can reproduce exactly the real evacuation process in stadium. Therefore, this method might be useful to assess public buildings design.