基于SM4算法的移动终端接入车间信息系统的安全性设计与验证

网络化的车间信息远程控制带给用户便捷的同时伴随着安全隐患,为了杜绝移动终端接入车间信息系统通信过程可能存在的潜在威胁,针对移动终端接入车间信息系统可能存在的安全问题,设计了身份认证、访问控制、异常行为检测、黑白名单过滤和接入审核的安全机制,并建立一个3层信息安全控制系统。经测试结果表明,设计的安全机制有效地提高了车间信息系统移动终端接入的安全性,可阻止针对移动终端接入车间信息系统可能存在的恶意攻击。     

图形协处理器SM501在视频系统中的应用

以一个包括SM501的嵌入式视频系统为实例,根据系统要求设计了该芯片的硬件电路,并讨论了图形协处理器SM501的图形显示和硬件加速功能,给出了详细的电路原理图和SM501的驱动程序.实验结果表明,多媒体图形协处理器通过和高性能的嵌入处理器相结合,可以达到同个人电脑水平相当的强大显示功能.对嵌入式系统中的图形显示应用设计有一定借鉴意义.     

一种引入单纯形法算子的新颖粒子群算法

提出一种将单纯形法SM与粒子群算法PSO混合的新颖优化算法,在10个著名测试函数上与其他已有算法进行了广泛的比较实验,并研究了不同参数选择对算法的影响.实验结果表明,这种混合算法对传统PSO求解的收敛率和解的质量有较明显的改善,在多峰函数优化问题上优势更突出.算法实现简单,具有很高的可靠性,是一种求解多峰连续函数极值的有效方法.     

Windows CE下SM501 STN驱动程序的设计

SM501是一款便携式多媒体协处理器芯片,专门为嵌入式工业提供补充功能,具有视频和2D能力,但该芯片厂家未提供STN液晶屏相关驱动程序。本文以Windows CE为开发平台,在Windows CE下实现SM501 FOR STN PANEL的驱动程序。     

钢包材料SM490B钢断裂及中温低周疲劳性能研究

针对新型钢包包壳材料SM490B钢，进行了室温断裂韧度、疲劳裂纹扩展速率及350℃（32作状态下，钢包包壳表面的最高温度）下的低周疲劳试验研究。结果表明，SM490B钢的强度和断裂韧度明显高于包壳曾用材料SM41A（Q235）、20g。在试验所取的应力强度因子幅值范围内，与Q235A钢和20g钢相比，SM490B钢的疲劳裂纹扩展速率较快。350℃下的低周疲劳寿命高于压力容器常用钢材16MnR钢30（1℃下的疲劳寿命。新型钢包包壳材料采用SM490B钢，可大大减少包壳开裂的可能性，提高钢包的承载能力和使用安全性，延长钢包的使用寿命。     

基于SM8260的双CPU协作能力测试平台设计

随着现代超大规模集成电路设计与制造工艺的快速发展，芯片的测试与验证所需的代价也越来越高。本文给出了SM8260芯片协作能力测试平台设计的方案，可基于该测试平台进行相关功能的验证与性能测试。     

基于P2P技术的媒体电信网

融合了P2P技术、利用电信运营商业务平台的媒体电信网(MTN)能够提供有服务质量保证、安全诚信的数字媒体业务。与现有客户端/服务器(C/S)和内容分发网络(CDN)架构的数字媒体系统相比,媒体电信网利用P2P技术,充分挖掘了用户终端资源,极大地降低网络和平台建设投资,具有低成本、高扩展性等独特优势。基于P2P技术的媒体电信网可以激活整个数字媒体产业价值链,具有广阔的市场前景。     

Modeling and characterizing GPGPU reliability in the presence of soft errors

The general-purpose computing on graphic processing units (GPGPUs) becomes increasingly popular due to its high computational throughput for data parallel applications. Modern GPU architectures have limited capability for error detection and fault tolerance since they are originally designed for graphics processing. However, the rigorous execution correctness is required for general-purpose applications, which makes reliability a growing concern in the GPGPU architecture design. With CMOS processing technologies continuously scaling down to the nano-scale, on-chip soft error rate (SER) has been predicted to increase exponentially. GPGPUs with hundreds of cores integrated into a single chip are prone to manifest high SER. This paper explores a first step to model and characterize GPGPU reliability in light of soft errors. We develop GPGPU-SODA (GPGPU SOftware Dependability Analysis), a framework to estimate the soft-error vulnerability of GPGPU microarchitecture. By using GPGPU-SODA, we observe that several microarchitecture structures in GPGPUs exhibit high soft-error susceptibility, and the structure vulnerability is sensitive to the workload characteristics (e.g. branch divergences, memory access pattern). We further investigate the impact of several architectural optimizations on GPU soft-error robustness. For example, we find that increasing the number of threads supported by GPU significantly affects the GPGPU soft-error robustness. However, changing the warp scheduling policy has little impact on the structure vulnerability. The observations made in this study provide designers the useful guidance to build resilient GPGPUs: a comprehensive resiliency solution for GPGPUs should consider the entire GPGPU design instead of solely focusing on a particular structure.     

PAHs in Sediments Contaminated by the Haven Oil Spill. (Genoese Bay)

Sediment samples were collected 40 months after the wreckage of the HAVEN off shore Arenzano, facing the Genoese coast, at 300 to 500 m depth, (wreckage zone) and analysed by UV fluorescence spectroscopy and CG/MS. PAHs as alkylated naphtalene, fluorene, phenanthrene, dibenzothiophene series have been studied. Analytical results reveal – 1° – a great alteration of alkylated homologues compared to parent compounds - 2° - the appearance of anthracene (absent in the original crude oil) in samples – 3° – a relative increase of high molecular weight PAHs (4–5 rings and more) as benzo(ghi)perylene and indeno(cd)pyrene. These changes result from the partial burning of the contaminant oil. A beginning of biodegradation is observed for alkylated phenanthrenes.     

Effect of experimental methodology on the JND of the black level for natural images

Abstract— The effect of experimental methodology on the Just Noticeable Difference (JND) of the black level (BL) is assessed using a set of representative natural images. Two methodologies, known in psychophysics to determine JNDs, are mutually compared: an adapted method of adjustment with a same‐difference task and a one‐up‐two‐down staircase method with a two‐alternative forced‐choice task. Thus far, the literature has shown contradictory results for which of the two methods yields the lower difference thresholds. Experimental results show that the second method yields lower JNDs, but is slightly less efficient. Based on this second method, it was found that the JND of the BL for natural images ranges from 0.2 to 1.0 cd/m², varying with image content significantly.