An investigation of the performance portability of OpenCL

This paper reports on the development of an MPI/OpenCL implementation of LU, an application-level benchmark from the NAS Parallel Benchmark Suite. An account of the design decisions addressed during the development of this code is presented, demonstrating the importance of memory arrangement and work-item/work-group distribution strategies when applications are deployed on different device types. The resulting platform-agnostic, single source application is benchmarked on a number of different architectures, and is shown to be 1.3–1.5× slower than native FORTRAN 77 or CUDA implementations on a single node and 1.3–3.1× slower on multiple nodes. We also explore the potential performance gains of OpenCL’s device fissioning capability, demonstrating up to a 3× speed-up over our original OpenCL implementation.     

寻求精确且可靠的振动感测适用于以状态为基础的预知维护

精密的工业制程对于马达与相关机械有效而且一致性运作的依赖日益提高.在机械中的失衡、缺陷、松散、以及其它异常现象通常都会转换成振动,而接着就是失去精密度与安全性的考虑.假如不加以处理的话,除了性能与安全的问题之外,当设备需要脱机修理时,生产力的损失将会变得无可避免.     

Emission mitigation potential of lightweight intermetallic TiAl components

An environmental comparison is made between two gamma titanium aluminide (γ-TiAl) alloys, Ti–46Al–8Nb and Ti–46Al–8Ta (at.%), and the standard nickel superalloy, INC713LC used for investment cast components in the low pressure (LP) turbine section of aero-engines. Over the complete lifetime, weight reduction by direct replacement could give significant reductions in CO₂ emissions, greatly outweighing the impact of other environmental emissions.     

Taming Charge Transport in Semiconducting Polymers with Branched Alkyl Side Chains

The solid‐state packing and polymer orientation relative to the substrate are key properties to control in order to achieve high charge carrier mobilities in organic field effect transistors (OFET). Intuitively, shorter side chains are expected to yield higher charge carrier mobilities because of a denser solid state packing motif and a higher ratio of charge transport moieties. However our findings suggest that the polymer chain orientation plays a crucial role in high‐performing diketopyrrolopyrrole‐based polymers. By synthesizing a series of DPP‐based polymers with different branched alkyl side chain lengths, it is shown that the polymer orientation depends on the branched alkyl chain lengths and that the highest carrier mobilities are obtained only if the polymer adopts a mixed face‐on/edge‐on orientation, which allows the formation of 3D carrier channels in an otherwise edge‐on‐oriented polymer chain network. Time‐of‐flight measurements performed on the various polymer films support this hypothesis by showing higher out‐of‐plane carrier mobilities for the partially face‐on‐oriented polymers. Additionally, a favorable morphology is mimicked by blending a face‐on polymer into an exclusively edge‐on oriented polymer, resulting in higher charge carrier mobilities and opening up a new avenue for the fabrication of high performing OFET devices.     

改进缺陷,套刻和聚焦性能的第五世代浸没式曝光系统

论述了第五世代双扫描平台浸液式扫描曝光机的性能和进展。表明了在高速扫描状态下有生产价值的套刻和聚焦性能的实现。浸液式设备更多的关键部分与缺陷有关,而且该机的改进是通过有生产价值的缺陷水平方面来体现的。为了保持这种缺陷水平的改进效果,需要在圆片应用中进行专门稳定的测量。特加是边缘空泡除去(EBR)设计和圆片斜面良流线性是很重要的。     

正确选择电源管理方案，提升系统性能并延长电池寿命

有了无线技术,用户就真正实现了"网络随行".然而无线设备无法长时间连接固定电源,因此如果仅靠电池供电的话,很快就能把电池电量消耗完.无论采用何种化学技术,电池都只能存储有限的电量,当电量耗尽时均需要替换或充电.加强对电源管理问题的重视可有助于延长电池的寿命.基站等一些不用依靠电池的无线系统必须在兼顾能源效率的前提下,才能实现高性能指标.     

扩展DSO功能的仪表放大器

为了确定一个太阳能发电厂的规格,需要准确地测量某个产品消耗的负载电流。该产品用于多个内部设备的开、关切换,间隔时间为数秒。但电流计显示电流瞬变的速度太快了,无法用目视观测,而我的经理要求提供有电流波形峰值的示波器照片。我推来了公司的车载DSO(数字存储示波器),在产品的正电源输入端串接了一个小阻值电阻器,试图在电流采样电阻器上作一个差分电压测量(Channel A减Channel B)。     

GSM话音应用的未来

讨论在当前发展的三种无线通信网ＧＳＭ、ＧＰＲＳ和ＵＭＴＳ中,话音业务所承担的角色,介绍 ＧＳＭ话音应用的未来。     

PMBus--数字电源开放标准协议

近年来,许多相关的因素导致对数字电源管理的需求急剧上升。许多板卡设计人员已经转向开发中间总线电源结构,通过使用多个单板DC/DC转换器来产生不同硅器件所需要的多样化的电源要求。这导致一个很明显的结果就是在产品的设计、生产测试及日常使用的过程中,配置、控制及监控这些电源将变得更加的复杂。光是控制上电/下电时序就需要专门的可编程集成电路及大量的额外部件,更别说用于灵活的系统级控制和诊断所需要的配置或实时反馈设施。     

高度集成的可编程单芯片传感器解决工业系统设计中的难题

传感器对工业系统设计中的性能、可靠性、安全性和自身成本等方面具有提供重大改进的潜能.涉及惯性传感器的应用案例包括平台稳定性、工业机器的运动控制、安全性设备、天线稳定性、机器人技术、导航、机械调平以及许多其它的应用.但是,在优秀的传感器技术与其在重要工业系统中的实现之间长期以来一直处于空白阶段.