We consider distributed memory algorithms for the all-pairs shortest paths (APSP) problem. Scaling the APSP problem to high concurrencies requires both minimizing inter-processor communication as well as maximizing temporal data locality.The 2.5D APSP algorithm, which is based on the divide-andconquer paradigm, satisfies both of these requirements: it can utilize any extra available memory to perform asymptotically less communication, and it is rich in semiring matrix multiplications,which have high temporal locality. We start by introducing a block-cyclic 2D (minimal memory) APSP algorithm. With a careful choice of block-size, this algorithm achieves known communication lower-bounds for latency and bandwidth. We extend this 2D block-cyclic algorithm to a 2.5D algorithm, which can use c extra copies of data to reduce the bandwidth cost by a factor of c1=2, compared to its 2D counterpart. However, the 2.5D algorithm increases the latency cost by c1=2. We provide a tighter lower bound on latency, which dictates that the latency overhead is necessary to reduce bandwidth along the critical path of execution. Our implementation achieves impressive performance and scaling to 24,576 cores of a Cray XE6 supercomputer by utilizing well-tuned intra-node kernels within the distributed memory algorithm.

关键词：所有对最短路径（APSP）；分布式内存算法；关键路径

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关键词：智能手机市场；高端饱和

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For emerging safety-critical systems, novel design methodologies are becoming necessary to cope with early stage design validation, performance and timing prediction, and design space exploration. In this paper, we propose a tool integration technique for architectural exploration of an aircraft electric power system (EPS) controller using Ptolemy II and Metro II to satisfy requirements imposed on safety-critical system design. The functional model of a newly suggested co-simulation environment is implemented with Ptolemy II and the model for architectural exploration is realized by SystemC. To construct the co-simulation environment and combine the functional model and the architectural model, Metro II semantics is employed. We verify effectiveness and extensibility of our new approach using experiments and results with example candidates for the aircraft EPS controller.

关键词：安全系统；飞机电力系统（EPS）；Metro II；Ptolemy II；SystemC

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The Asia-Pacific IT and high technology sector has held up well over the past few years, accounting for a greater share of the global ICT market.A Mergent analysis shows the market capitalization of the top nine major Asia-Pacific IT companies tracked totaled US$179.45 billion, as of March 20, 2013.Although semiconductor sales in 2012 dropped by 1.13% to US$162.6 billion, the outlook is encouraging as emerging Asian economies are attractive for semiconductor consumption due to strong demand.IT companies have turned to other industries to offset losses from hardware sales and to lessen the reliance on consumer electronics due to the shift toward mobile devices.Accelerating investment is led by the Asia-Pacific, where most companies have invested more in new technologies than their European counterparts.

关键词：IT；半导体；硬件设备；移动设备；ICT；物联网；无线充电器；智能电视；新兴经济体；亚太地区

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The electronic security industry hosts a gamut of products which are primarily used for monitoring or surveillance, intrusion detection, fire of Carbon Monoxide detection, safe access, contraband detection and others.It also entails a variety of products designed to meet the specific requirements of the homes, commercial spaces such as offices and complexes, public places such as malls and large industries and institutions.The industry draws its revenues primarily from the sales,installation and replacement markets.Additionally,some of the electronic security systems also involve monitoring expenses which are a major source of the increasing recurring monthly revenue(RMR) of the dealers and integrators.

关键词：电子安全；非住宅电子安全；商业电子安全；住宅电子安全；访问控制；视频监控；入侵检测；消防；

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关键词：智能手机；消费市场；国内终端厂商

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关键词：国产手机；电商渠道；建设

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关键词：中国；智能机市场

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关键词：手机厂商；平板市场

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关键词：LTE手机；智能机；产业链

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