西夏文字识别中的图像预处理

西夏文字的预处理是其识别过程的第一步,它的好坏直接影响西夏文字识别的效果。文章用图像分析及处理技术研究西夏文字的预处理,就西夏文字识别预处理中的每个过程进行了详细的研究,提出的方法和处理技术在实验中收到了良好效果。     

基于改进型脉冲耦合神经网络的图像二值分割

图象二值分割在图像分析和模式识别中是一项最基本也是最重要的预处理 ,它处理的好坏将直接影响后续的分析和处理效果。如何更有效、适应性更强地实现图像二值化 ,一直是困扰人们的一个难题。该文提出了一种新的图像二值分割方法———基于脉冲耦合神经网络的图像二值分割。它利用脉冲耦合神经网络的特性 ,实现图像的二值化。与传统图像二值化方法相比 ,它完全是一种与图像自适应的二值分割 ,易于软件和硬件的实现。对于含有丰富细节或低对比度的图像二值分割 ,该方法的优越性更为突出。实验结果表明了该方法的有效性。     

JOINT EARLY DETECTION AND EARLY STOPPING SCHEME FOR COMPLEXITY REDUCTION OF TURBO DECODING

In this paper,a Joint Early Detection and Early Stopping (JEDES) approach for effectively reducing the complexity of turbo decoding with negligible performance loss is proposed. It combines the effectiveness of both early detection and early stopping techniques. Our simulation results demon-strated that the proposed JEDES scheme based on cyclic redundancy check and trellis splicing can achieve a complexity saving of 15% to 20% at practical bit error rates over the idealized GENIE stopping scheme,which is widely accepted as the theoretically best possible early stopping scheme.     

移动自组网按需机制路由协议路径失效预测和局部修复算法

提出利用信号强度对将要断开的链路进行检测，并在局部利用路径请求—路径回答过程，找到替代路径，对原来的路径进行局部修复的算法。在尽量少增加路由开销的同时，达到提高路径修复的效果。同时对缓存器中路径设置失效时限，以免长时间未用路径时误用失效路径。在DSR协议上应用改进算法，在ns-2仿真环境中对6组不同场景进行仿真，验证算法正确，明显提高了移动自组网的性能。     

多入口集群负载均衡问题研究

分析了常用的负载均衡算法在多个调度器上同时运行时的效果，提出多入口集群的水平分割调度方案，该方案通过对各调度器设置阈值来实现。为度量轮循调度的接口负载并设置阈值，提出了轮循频率的概念，当来自不同接口的流量不一致时，需要对阈值进行调整以提高整个集群的吞吐量，为此，提出了阈值动态调整算法和一种分布式调整触发机制。该方案兼容现有的单调度器方案，有效地解决了集群环境中存在多个调度器时的负载均衡问题。     

基于VSS的移动自组网密钥管理研究

移动自组网Manet是一种新型的由移动节点为了某种特定目的而彼此进行连结的网络。与一般意义的网络相比较,移动Adhoc网络通常不提供对信任中心或中心服务器的在线访问,而且由于连接1和节点失效或者节点的漫游常常呈现频繁的网络分割,所以,传统的安全策略不能直接运用于该网络,必须添加新的安全措施。该文基于Manet的安全特性,根据信任分担思想,提出了一种基于安全可验证秘密共享的密钥管理方案,即将(n,t)门限秘密共享体制与可验证秘密共享VSS(VerifiableSecretSharing)相结合,实现密钥的安全分发和安全更新。     

Some effects of yield strength on the stress corrosion cracking behaviour of low alloy steels in aqueous environments at ambient temperatures

The present paper describes the results of a literature review on the effects of material yield strength on the threshold stress corrosion cracking (SCC) condition known as K_1SCC, of a series of low alloy steels in various aqueous environments at ambient temperatures. It has been shown that an increase in yield strength reduced the value of K_1SCC and that this effect was more significant over the lower yield strength range 600–1200 MPa; at higher yield strength levels the effects of yield strength were much less evident. A review of the results indicated that SCC transgranular fracture was seen at yield strength values below around 1200 MPa while above this value the fracture path was exclusively intergranular in nature. Note that the transition point between transgranular and intergranular SCC coincided with the point at which yield strength effects were much reduced. A series of models reported in the literature, which attempted to explain the effects of yield strength on K_1SCC in terms of a fracture mechanics framework were examined with the introduction of a critical distance concept. Finally, the predictions of a grain size effect on the point at which the fracture path changed from transgranular to intergranular were taken from one model and used to show that the large data scatter in the region where transgranular fracture was operative, viz., the lower yield strength region of 600–1200 MPa, could be the result of grain size variations between the different reported studies.     

基于BP神经网络陶瓷生产监控系统的设计

陶瓷行业的工作重点是隧道窑温度控制系统的完善与推广。本文采用神经网络控制策略设计了一套陶瓷生产过程的智能监控系统，并应用了改进的BP神经网络学习算法。     

SDH支路同步过程抖动抑制的研究

ＳＤＨ技术体制为了兼容ＳＤＨ与ＰＤＨ可能使得普通正／０／负码速调整同步化方法抖动频率太低而使抖动难以抑制，本文提出了门限调制码速调整进行同步化的新方法，并介绍了其工作原理，着重对门限调制码速调整的科动进行了分析，并得出了用以指导设计的一些重要结论。     

Impacts of government subsidies and environmental regulations on green process innovation: A nonlinear approach

With China's tremendous economic development following its reform and opening-up, the problem of environmental deterioration has become increasingly serious. To achieve a win-win situation between economic growth and environmental protection, enterprises are being encouraged to carry out green technology innovation, but due to the risks and uncertainties inherent in it, the government is providing research and development (R&D) subsidies while at the same time implementing environmental regulations. As the Organisation for Economic Cooperation and Development (OECD) [5] divides green technology innovation into green product innovation and green process innovation, this study focuses on the latter in order to better study its relationship with environmental regulations and government subsidies. We select panel data of 30 provinces and cities in China from 2009 to 2017 (excluding Tibet, Hong Kong, Macao, and Taiwan, because of a lack of data) and use the system GMM and threshold-effect model for empirical analysis. The results show that environmental regulations have a U-shape non-linear effect on green process innovation, while government subsidies have a positive role in promoting green process innovation, or the so-called leverage effect. Based on government subsidies, the impact of environmental regulations on green process innovation has a threshold effect, and therefore regulations and subsidies should be increased. In addition, the level of economic development has a U-shape effect of inhibition and then promotion on green process innovation. Overall, the China government should continue to develop its economy, but must not neglect the impact of environmental regulations on technological innovation at the expense of environmental damage.