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国家自然科学基金(60272048)

作品数:24 被引量:50H指数:4
相关作者:孙小菡张明德袁明辉李雷饶敏更多>>
相关机构:东南大学上海理工大学南京师范大学更多>>
发文基金:国家自然科学基金上海市高校选拔培养优秀青年教师科研专项基金博士科研启动基金更多>>
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24 条 记 录,以下是 1-10
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Research on Coordination Mechanism in Construction Project Organization被引量:1
2006年
The construction process of modern project is distributed across teams, departments, or systems, each of which is corresponding to a particular project unit. Conflicts often occur in construction project organization because of the improper coordination amongbetween these project units. The primary reason for coordination puzzle in project organization is generally the diversification of culture and technology. In order to enhance the organization’s performance efficiency, good and effective coordination mechanism aimed at diversification of culture and technology is needed. The relationship amongbetween parties and project units is defined and expressed through contract, so construction project organization usually relies on various contracts to deal with its cooperative partner relationship. However, the contractual mode is a defensive method which is more prone to conflicts than the conglomerate of diversification, especially evaluated from the aspects of culture and value. By culture integration—a more flexible way to make up the shortage of contractual mode, a harmonious atmosphere in which organization members can exert their potential ability can be created to help project administrators mitigate organization conflicts and achieve the common goals of project organization. Based on arbitration theory, moreover, this paper puts forward a combined coordination mechanism-hierarchical coordination and nonhierarchical coordination—to resolve the conflicts resulted from diversification of technology. The introduction of intelligent agents system has the advantage of a more systematic and organizational method in reality without causing unnecessary emotional and the behavioural side effects is an effective instrument to utilize this coordination mechanism and realizes its established goals.
Chen ShoukeCheng HuWei Zhuobin
关键词:工程项目项目管理合同保护文化冲突文化多样化
光突发交换网络中Jitter-EDF调度算法的研究被引量:1
2005年
提出了一种应用于OBS网络中的Jitter-EDF调度算法来减小时延抖动对实时性突发QoS的影响,设计了基于该算法的OBS网络中核心路由器的主要结构,讨论了此算法实现的可能性,并推导出端到端时延的上下限和时延抖动的上限.最后结合具体网络拓扑进行了仿真和分析.结果表明,Jitter-EDF调度算法能够将时延抖动的幅度平均降低到30%~40%,有效保证了实时性应用对时延抖动的要求.
张兴李雷张明德孙小菡
关键词:OBS端到端时延时延抖动
一种新型的动态路由和波长分配综合算法被引量:2
2004年
讨论了WDM光网中 ,在动态业务流量和有限范围波长变换情况下的动态路由和波长分配问题。基于Moone -Dijkstra算法 ,考虑到动态波长变换的可能和限制 ,提出了一种新型的、可实现动态最小代价路由和最佳虚波长通道的综合启发式算法 (DMC -OVWP)。该算法对路由子问题和波长分配子问题既相互独立 ,又相互结合 ,优化了RWA。以中国教育和科研计算机网 (CERNET)为拓扑背景 ,基于本算法进行了计算机仿真 ,并对实验结果进行了比较分析 ,证明本算法可充分利用网络信息获取较低的阻塞率。
李雷唐勇饶敏陈宇蒋建峰张明德孙小菡
关键词:动态路由波长变换
色散对光CDMA传输系统性能的影响被引量:1
2007年
基于耦合非线性薛定谔方程分析了光CDMA传输系统中光纤色度色散对传输性能的影响,给出了考虑色度色散系数r后光BER的表达式,使得对系统BER的理论分析更加有效.数值计算结果显示,r=0.4时7码片M-序列系统在10-9的BER时功率衰减4.8dB;并进一步表明,对功率衰减6dB的31码片M-序列系统,当r=0.4时,同时使用的用户不超过24个,而r=0.6时,使用的用户不超过20个.指出色度色散对单极性光码分多址系统性能的影响较大,在相同情况下,r越大,接入用户数越少.
侯奋飞孙小菡
关键词:开关键控色度色散
波长路由光网络中基于元件库的传输损伤评估
为保证路由与波长分配机制的可靠性,对网络链路中的传输损伤进行评估,评估的方法是为主要网络元件建立软件模型,作为模拟网络性能的元件库。以光纤为主,考虑了色度色散、非线性效应,ASE噪声等影响,对波形的传输作了仿真计算,输出...
蒋建锋饶敏陈宇李雷张明德孙小菡
关键词:波长路由光网络元件库误码率
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Numerical Analysis for Temperature Characteristics of Open Boundary Crushed-rock Embankment on Qinghai-Tibet Railway被引量:1
2006年
At present, in order to protect the stability of permafrost beneath emban kment, the crushed-rock emban kment, as a new type of emban kment structure, has widely been used in the construction of Qinghai-Tibet Railway. Its crushed-rock layer is almost open in tow bilateral boundaries and closed at top and bottom, and air can flow into/out of the ballast layer and crushed-rock layer. Therefore, the convection and transfer heat patterns are very complicated in the ballast layer and crushed-rock layer of the emban kment, which are regarded as porous media. In this paper, based on the wind, temperature and geology conditions of Qinghai-Tibet Plateau, a numerical approach of the unsteady two-dimensional continuity, momentum (non-Darcy flow) and energy equations of heat convection for incompressible fluid in porous media is provide to analyse the velocity and temperature characteristics of the crushed-rock emban kment with different emban kment heights under open boundary condition for the coming 50 years. The calculated results indicate that, due to the influence of the external wind, the convective heat transfer mainly relies on the forced convection in the open crushed-rock emban kment. Even if the air temperature will be warmed up by 2.6℃ in the coming 50 years, it still has a better cooling effect on the underlying soils and a low temperature frozen-soil core is formed in the permafrost below it if the emban kment is constructed in the regions whose present mean annual air temperature is -4.0℃. Furthermore, the cooling effect of high crushed-rock emban kment is better than that of low emban kment. This results from the fact that the wider bottom of high emban kment has a more influence dimension on the underlying frozen soil. However, cardinal winds on Qinghai-Tibet Plateau disturb its convection pattern, so that an asymmetric temperature distribution occurs under high emban kment and it is possible to induce a transverse uneven deformation of emban kment, but no similar situation occurs under low emban kment.
Lai Yuanming Zhang Mingyi Liu Zhiqing Yu Wenbing
关键词:青藏铁路温度特性
OBS突发装配的缓存安全间隔机制被引量:1
2005年
研究了光突发交换边缘路由器上的突发装配,着眼于使其更加通用、合理和高效.为此,引入了单位输入比特率的概念以提高通用性,然后提出和分析了装配中的缓存安全间隔机制及其作用.通过设置适当的缓存安全间隔值,不仅可以避免因缓存溢出引起的分组损失,而且所获得的固定最大发送时间也为突发的信道调度带来了便利.采用边缘路由器上的自相似流量模型,通过网络仿真,讨论了缓存安全间隔取值对突发生成、网络性能及缓存使用的影响,并获得了相关结论.
李雷张明德孙小菡
关键词:波分复用光突发交换自相似流量
PMD对NOLM光开关性能的影响及其补偿措施
2005年
基于耦合非线性薛定谔方程,采用分步傅里叶方法分析了一阶和二阶PMD对NOLM光开关性能的影响,指出PMD造成NOLM开关性能钝化,引起消光比严重恶化,采用合适的码型能在一定程度上减少PMD的影响.提出了一种在NOLM光纤环中内置保偏光纤以补偿PMD的方法,其补偿位置位于光纤环中点时对开关性能影响最小.
袁明辉张明德孙小菡
关键词:非线性光纤环镜偏振模色散保偏光纤
交叉相位调制对非线性光纤环镜中光脉冲传输的影响被引量:10
2006年
基于耦合非线性薛定谔方程,采用分步傅里叶方法分析了在单波长信道和WDM(波分复用)4波长信道中XPM(交叉相位调制)对高速NOLM(非线性光纤环镜)光开关中脉冲传输的影响·数值计算表明:XPM造成NOLM中信号脉冲串扰与畸变,并造成NOLM开关性能的下降·WDM系统NOLM光纤环中的同向传播的各波长之间的XPM串扰比相向脉冲之间的XPM效应的影响更大,并且波长越短输出功率越低,中间信道受XPM的影响所导致的脉座现象和走离效应比两侧波长信道严重·
袁明辉张明德孙小菡
关键词:物理电子学全光开关非线性光纤环镜交叉相位调制
具有安全间隔和通用参数的OBS突发装配算法被引量:3
2005年
研究了光突发交换边缘路由器上的突发装配,提出了带安全间隔的突发装配具体实现算法,同时为体现通用性引入了单位化输入比特率的概念,以适应不同实际网络中的最小分组长度和输入比特率.基于这一算法,通过网络仿真,讨论了在自相似流量时,包括突发长度极值、装配时间阈值等在内的各类参数设置对突发产生、突发长度分布、分组丢失率、输出数据总量及有效信息率等的影响.
李雷张兴张明德孙小菡
关键词:波分复用光突发交换自相似流量
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