Aggregate States and Energetic Disorder in Highly Ordered Nanostructures of para‐Sexiphenyl Grown by Hot Wall Epitaxy

We report on photoluminescence (PL) and thermally stimulated luminescence (TSL) in highly ordered nanostructures of para‐sexiphenyl (PSP) grown by hot wall epitaxy (HWE). A low‐energy broad band is observed in the PL spectra that can be attributed to the emission from molecular aggregates. While the intrinsic exciton emission in steady‐state PL dominates at low temperatures, the emission from aggregates increases with elevating temperature and its magnitude depends sensitively on film preparation conditions. Time‐resolved PL measurements showed that the aggregate emission decays with a life‐time of ≈ 4 ns, which is approximately an order of magnitude larger than the lifetime of singlet excitons. TSL data suggests the presence of an energetically disordered distribution of localized states for charge carriers in PSP films, which results from an intrinsic disorder in this material. A low‐temperature TSL peak with the maximum at around 30 K evidences for a weak energy disorder in PSP films, and has been interpreted in terms of a hopping model of TSL in disordered organic materials.     

对网状WDM网中双链路失效的保护算法分析

研究了网状WDM网中双链路失效下共享通路保护(SPP)和共享链路保护(SLP),以及新的保护方式—共享段保护(SSP)的模型,并分析了静态和动态保护算法。动态保护算法可以根据当前网络状态动态调整链路代价,使它们具有较高的资源利用率和较低的阻塞率。     

基于PSP/TSP的软件过程改进框架

提出在现有的辅助软件过程改进的支撑工具中加入个人级和团队级的软件过程管理及改进的方法,即提出基于PSP/TSP的软件过程改进框架,以期在软件组织中进一步完善软件过程改进作用。在个体过程方面,实现了个体过程计划制定、过程度量数据采集、过程数据分析和估算等功能;同时在团队过程方面,实现了量化的项目进度控制和质量控制。     

A Replicated Empirical Study of the Impact of the Methods in the PSP on Individual Engineers

The Personal Software Process (PSP) has during the last couple ofyears gained attention as a way to individual improvements insoftware development. The PSP is introduced to students and engineersthrough a course, which introduces a personal software developmentprocess. The personal software development process is improvedin steps during the course and a collection of methods is introducedto support the personal development process. The question is,however, how do these methods influence the performance of anindividual engineer? This question has been studied in a studymade at the Software Engineering Institute, and the study hasshown that the methods in the PSP have a positive effect on theperformance of the individuals. There is however a need to replicatethis study to confirm the findings in other settings and withother individuals. This paper describes a replicationof the study made at the Software Engineering Institute. Boththe original study and this replication are made on data reportedfrom the students taking the PSP course. The differences betweenthe two studies are the programming languages used, which heldthe courses, the class sizes, and the experiences of the students.In summary, the results from this replication confirm the resultsin the original study: Size estimation accuracy gets better,the defect density gets lower, the defects are found earlierand that the pre-compile yield gets better during the PSP course.Basically, the two studies show that the methods in the PSP helpengineers to improve their performance.     

偏振模色散前馈方案中偏振主态研究

前馈偏振模色散（PMD）补偿系统中重要的一项是要精确得到链路中的偏振主态（PSP）方向。通过在实验中加入扰偏器，分别用矢量法和粒子群优化（PSO）算法来拟合实验结果得到椭球，从而用椭球法得出了主态方向。结果表明：矢量法在获得椭球要比PSO算法更精确、速度更快以及所得到PSP方向更准确，其更适合用于前馈补偿方案中。     

光学压力敏感涂料的研制

光学压敏涂料测压技术是风洞试验中表面压力测量的新手段。介绍了光学压敏涂料测压技术原理,光学压敏涂料的研制和其在风洞试验中的应用。试验表明:所研制的光学压力敏感涂料与传统压力传感器具有相同性能。传统方法测量压力,需要在模型表面开通一些压力测量孔,是间断的点压力测量。光学压力敏感涂料测量压力的突出优点是可测量连续的大面积的表面压力分布,并且不需要昂贵的专用测压模型。     

基于CHASE译码思想的PCMA信号盲分离算法

在软输出逐幸存路径处理（SOVA-PSP）算法的基础上,提出了基于Chase译码思想的载波成对复用多址（PCMA）信号的盲分离算法。该算法对SOVA-PSP软输出的结果进行可靠性排序,对于排序中可靠性较低的混合符号进行信号重构,通过重构信号和接收信号之间的欧式距离对比纠正其中的错误结果。仿真结果表明,所提算法与SOVA-PSP算法相比,性能有2 dB左右的增益。     

利用Gibbs采样的同频混合信号单通道盲分离

针对非合作接收的单通道同频数字调制混合信号,提出一种基于Gibbs采样的分离算法。该算法利用统计的方法获得未知符号序列概率密度的随机样本,运算复杂度随信道阶数的增加不呈指数增长。重点研究了基于单符号对、多符号对的分离算法和信道响应的跟踪,并对Gibbs分离算法和PSP分离算法的性能进行了详细的分析比较。仿真结果表明,针对2路QPSK调制的混合信号,在与L=4时的PSP算法具有近似分离性能的同时,Gibbs分离算法可使复杂度降低近17倍。     

个体软件过程的研究与实践

个体软件过程(PSP)是当前软件行业的重要技术,给开发者提供了一个进行软件开发的标准化框架.本文在阐述个体软件过程(PSP)原理的基础上,结合软件过程的实施过程,探讨了实施个体软件过程PSP时要注意的问题.     

软件项目管理技术分析研究

从软件项目管理的重要性谈起，研究分析了四个主流的软件项目管理技术，指出了它们的缺陷，最后结合实践提出了一种新颖的软件项目管理概念。