The Rise of the Machines

There are now 1 million industrial robots toiling around the world, and Japan is where they?re the thickest on the ground. It has 295 of these electromechanical marvels for every 10 000 manufacturing workers?a robot density almost 10 times the world average and nearly twice that of Singapore (169), South Korea (164), and Germany (163).     

VoIP不是运营商的末日

近一段时间以来,VoIP引起了越来越多的人的关注.先是信产部在7月份下发通知要求除了中国电信和中国网通能够在部分地区进行PC-Phone方式VoIP电话商用试验外,任何单位和个人都不得从事VoIP业务.     

交流电机旋转磁场的教学研究

“电机学”课程中的旋转磁场是交流电机理论的一个重要的知识点。但是由于磁场本身比较抽象,它成为教学中的一个难点。为此,笔者在本知识点的教学中设计了研究性训练环节,让学生应用电磁场有限元数值计算软件进行交流电机电磁场的数值计算,分析旋转磁场,脉振磁场和多极磁场的特点,归纳总结出旋转磁场的规律。这种研究性训练促进了学生对交流...     

神奇四侠2银影侠现身

联手击败了毁灭博士的”奇幻人”里德、“隐形女”苏、“石头人”本、“霹雳火”约翰尼不需要再像过去那样隐藏自己的身份，成为了万众拥戴的偶像，而里德和苏也迎来了甜蜜的婚礼。不过，总会有拯救人类的大事让他们去做的。婚礼上，一位脚踩滑板飞行、通体金属银色的不速之客到达了地球，不仅让婚礼泡汤，也在全球各地制造出了多个巨大的深坑，引起无数灾难。原来，     

Rise of the Graphics Processor

The modern graphics processing unit (GPU) is the result of 40 years of evolution of hardware to accelerate graphics processing operations. It represents the convergence of support for multiple market segments: computer-aided design, medical imaging, digital content creation, document and presentation applications, and entertainment applications. The exceptional performance characteristics of the GPU make it an attractive target for other application domains. We examine some of this evolution, look at the structure of a modern GPU, and discuss how graphics processing exploits this structure and how nongraphical applications can take advantage of this capability. We discuss some of the technical and market issues around broader adoption of this technology.     

3D‐Architected Soft Machines with Topologically Encoded Motion

The limited range of mechanical responses achievable by materials compatible with additive manufacturing hinders the 3D printing of continuum soft robots with programmed motion. This paper describes the rapid design and fabrication of low‐density, 3D‐architected soft machines (ASMs) by combining Voronoi tessellation and additive manufacturing. On tendon‐based actuation, ASMs deform according to the topologically encoded buckling of their structure to produce a wide range of motions (contraction, twisting, bending, and cyclic motion). ASMs exhibiting densities as low as 0.094 g cm^?3 (≈8% of bulk polymer) can be rapidly built by the stereolithographic 3D printing of flexible photopolymers or the injection molding of elastomers. The buckling of ASMs can be programmed by inducing gradients in the thickness of their flexible beams or by the localized enlargement of the Voronoi cells to generate complex motions such as multi‐finger gripping or quadrupedal locomotion. The topological architecture of these low‐density soft robots confers them with the stiffness necessary to recover their original shape even after ultrahigh compression (400%) and extension (500%). ASMs expand the range of mechanical properties currently achievable by 3D printed or molded materials to enable the fabrication of soft machines with auxetic mechanical metamaterial properties.     

EEDVMI: Energy-Efficient Dynamic Virtual Machines Integration

Mobile Networks and Applications - The rapid development of cloud computing technology has resulted in a great energy consumption, but the utilization rate of resources in the data centers is often...     

An Eigen-Normal Approach for 3D Mesh Watermarking Using Support Vector Machines

The use of support vector machines （SVM） for watermarking of 3D mesh models is investigated. SVMs have been widely explored for images, audio, and video watermarking but to date the potential of SVMs has not been explored in the 3D watermarking domain. The proposed approach utilizes SVM as a binary classifier for the selection of vertices for watermark embedding. The SVM is trained with feature vectors derived from the angular difference between the eigen normal and surface normals of a 1-ring neighborhood of vertices taken from normalized 3D mesh models. The SVM learns to classify vertices as appropriate or inappropriate candidates for modification in order to accommodate the watermark. Experimental results verify that the proposed algorithm is imperceptible and robust against attacks such as mesh smoothing, cropping and noise addition.     

On the Speed Limits of Permanent-Magnet Machines

Permanent-magnet (PM) machines are considered the most suitable machine type for very high speed applications. Still, due to the growing demand for the ever higher rotational speeds, PM machines are approaching their limits. The focus of this paper is the different factors that lie behind the inherent speed limitations of PM machines. The limits-thermal, elastic, and rotor dynamical-are defined, classified, and correlated to basic machine parameters.