基于底层特征和高级语义的真实失真图像质量评价

目的由于现有无参考质量评价方法无法准确判断真实失真图像的质量,提出一种基于图像底层特征和高级语义提取的真实失真图像质量评价方法。方法首先根据真实失真图像的底层特征指标进行k-means聚类,在每一类图像中利用深度卷积神经网络(Deep Convolutional Neural Network, DCNN)的方法提取图像的一级高级语义特征,采用多种特征函数对一级高级语义特征进行聚合,得到图像的二级高级语义特征,并建立了高级语义特征与平均意见主观分(Mean Opinion Score, MOS)的高容量回归器。结果提出的算法在KonIQ-10k图像库预测出的质量分数与对应MOS值能达到很高的一致性,Spearman秩序相关系数(SROCC)和Pearson线性相关系数(PLCC)分别能达到0.95和0.97。结论提出的算法能够快速且准确地对真实失真图像质量作出评价。     

全悬空、倒挂型多层检修马道施工技术研究

青岛大剧院工程主舞台马道采用4层倒挂型钢结构框架体系,针对马道上方封闭、下方距混凝土平台40余m的高难度施工作业条件,采用了整体拼装、分段吊装就位、高空安装成形的施工方法,解决了全悬空、倒挂型多层检修马道安装的施工难题.应用仿真模拟分析技术,在安装过程中对马道的应变和应力进行分析,证明该法能够保证工程质量,确保施工过程安全.较传统施工工艺,缩短了工期,能取得较好的经济效益.     

硬件加速CNN实时图像处理方法

针对CNN算法计算量大、运算耗时长、对PC资源依赖程度高的缺点,提出一种基于Vivado高层次综合硬件加速CNN实时图像处理的方法。将训练好的CNN模型中各参数提取并导入Vivado HLS中,利用C++语言按照Vivado HLS处理规范编写CNN识别算法,实现由FPGA的逻辑资源生成CNN算法对应的RTL级硬件电路,通过Vivado HLS仿真窗口进行CNN识别算法的测试,评估硬件加速CNN算法实时图像处理的效果。实验结果表明,该方法识别MNIST库中10 000例手写体样本仅需8.69s,PC端识别相同样本的时间为30s,该方法有利于实时图像处理算法向硬件化高性能处理平台ZynqSOC移植。     

Numerical analysis of highly efficient laser-based method of radioactive Cs isotope separation utilizing light-induced drift in D1 and D2 transitions in rare gases

We investigated the feasibility of separating radioactive Cs isotopes using the effects of light-induced drift (LID). LID is the massive flow of particles caused by the difference between the collision frequencies of the buffer particles in the optically connected ground and excited states. We numerically evaluated the LID velocities of Cs-133, Cs-135, and Cs-137 in rare gases based on the currently available experimental technologies. The calculations were performed utilizing the steady-state analytical model and assuming that all of the collisions were strong. The velocity-dependent collision cross-sections were estimated using the WKB approximation with the recently developed ab initio atom–atom interaction potentials. A maximum velocity of more than 10 m/s was obtained when He was utilized as the buffer gas, and the expected maximum annual throughput was approximately 600 g, which is sufficient for practical purposes. We also examined the negative effects that were neglected in the employed model.     

预应力装配式高耸风电塔架受力性能研究

预应力装配式高耸风电塔架下部为预制装配式混凝土塔筒,上部为钢塔筒,上端锚固于法兰环,下部锚固于基础内部。在风电塔架体内沿环向均匀布置竖向预应力拉索,张拉后将上部钢塔筒和下部装配式混凝土若干塔筒连接为整体。针对中间转换部分,采用转换段法兰环、变截面混凝土、预制混凝土竖向缝以及水平缝等连接构造。为研究该结构及各连接构造的受力性能,开展精细化有限元分析、拉索107次高周疲劳性能试验以及1∶3大比例尺模型试验,得到了结构关键部位的力学响应和破坏模式等。结果表明：设计荷载作用下,预应力装配式混凝土塔筒表现出弹性特征,可以安全地承受设计荷载;极限荷载作用下,预应力装配式混凝土塔筒段承载力储备充足,且上部钢塔筒先于混凝土塔筒段出现屈曲破坏,混凝土塔筒与钢塔的承载力比例设置合理,避免了混凝土塔筒先于钢塔筒破坏,验证了结构体系和连接构造设计的可行性;疲劳试验及有限元分析结果表明拉索能承受107次的疲劳次数,满足抗疲劳安全性要求。     

集成电路高层故障模型间关系分析方法

集成电路的测试变得日益重要,传统的门级测试虽然效果很好,但是随着电路规模的增大而面临着测试时间太长的困境.高层测试可以很好地缓解测试时间过长的问题,但最大的困难是缺少恰当的故障模型.通过对高层故障模型与门级固定型故障模型间关系可以建立高层故障模型的评估规则,在该规则下可以再对高层故障模型间关系进行分析,以确定彼此间的覆盖关系.归纳模型间的互相覆盖以确定彼此是否包含,这有助于对高层故障模型进行评估,寻找能够对应逼近门级固定型(stuck-at)故障模型的高层故障模型序列,该模型序列有望指导新的测试生成.最后,以对ITC99中标准时序电路的实验来说明该理论方法.     

基于QoS的社区公共服务网格资源调度

社会资源的分布性、社区服务节点的动态性和社区服务的异构性,使得传统的基于Web的社区服务管理难以实现服务资源的全面共享.针对这些问题提出了基于开放网格服务结构(OGSA)的虚拟社区服务网格体系结构,并给出随机高级Petri网模型,以实现一个基于服务质量(QoS)的社区服务资源调度.     

计算机动画角色的高级行为控制

用人工生命方法创造计算机动画,增强了计算机动画的逼真度和生动性.为了更好地控制动画的进程,指导动画角色的行动,本文将人工智能方法引入到计算机动画的创作中.提出并建立了面向自繁衍的人工鱼的认知模型,提高人工鱼的认知能力,实现基于“动物逻辑”的人工鱼高级行为控制.建立了人工鱼产生交配欲望、产卵和环境选择等预定义行为的认知模型.实验表明,人工鱼的高级行为控制器可以使人工鱼更好地适应虚拟海底环境,并顺利完成交配、产卵等生命过程.     

Lifecycle of palladium in Japan: for setting clearance levels of 107Pd

Research on the recycling of useful elements in spent nuclear fuels of light-water cooling reactors is progressing. Palladium (Pd), a fission product in high-level radioactive waste, is one of the elements that can be recovered and recycled. Even if the Pd recycling system is successfully established, ¹⁰⁷Pd contamination will be unavoidable. In this report, we review the lifecycle of Pd (applications, environmental levels, and human exposure) with respect to setting clearance levels for ¹⁰⁷Pd. The major applications of Pd in Japan are catalysts for automobile exhausts and chemical industries, followed by dental prostheses and electrical devices. The World Health Organization reported a daily uptake of Pd from drinking water and food of 0.03 and <2 μg person^?1, respectively. The uptake of a person with a dental prosthesis containing Pd might reach up to 15 μg day^?1. The Pd uptake by the public via inhalation of particulate matter from automobile exhaust catalysts is not as large, even in urban areas, although this industrial application is responsible for the largest portion of Pd released into the environment globally. The data presented here will be useful for setting clearance levels for ¹⁰⁷Pd.     

A Thermoelectric-Conversion Power Supply System Using a Strontium Heat Source of High-Level Radioactive Nuclear Waste

A thermoelectric-conversion power supply system with radioactive strontium in high-level radioactive waste has been proposed. A combination of Alkali Metal Thermo-Electric Conversion (AMTEC) and a strontium fluoride heat source can provide a compact and long-lived power supply system. A heat source design with strontium fluoride pin bundles with Hastelloy cladding and intermediate copper has been proposed. This design has taken heat transportation into consideration, and, in this regard, the feasibility has been confirmed by a three-dimensional thermal analysis using Star-CD code. This power supply system with an electric output of 1MW can be arranged in a space of 50m² and approximately 1.1m height and can be operated for 15 years without refueling. This compact and long-lived power supply is suitable for powering sources for remote places and middle-sized ships. From the viewpoint of geological disposal of high-level waste, the proposed power supply system provides a financial base for strontiumcesium partitioning. That is, a combination of minor-actinide recycling and strontium-cesium partitioning can eliminate a large part of decay heat in high-level waste and thus can save much space for geological disposal.