This report covers work done for the Director's Research Initiative (DSI) on Gallium Nitride (GaN) High Power Electronics (HPE) in which GaN devices are assessed in comparison to those fabricated from silicon carbide (SiC). We show that for low power applications (less than 1500 V) GaN diodes should have a lower on-resistance, and therefore less loss, than their SiC counterparts because the critical breakdown field and electron mobility are larger. We expect this will also be true for HPE GaN high electron mobility transistors (HEMTs) compared to SiC metal-oxide-semiconductor field effect transistors (MOSFETs). Although a few GaN devices have been made that have properties that exceed those made from SiC, these devices cannot yet be manufactured. Our work suggests the dominant problem is contamination of the metal-organic chemical vapor deposition (MOCVD) films by the carbon in the trimethyl gallium (TMGa). We suggest a better alternative is to grow the films by hydride vapor phase epitaxy (HVPE), which requires that conducting GaN substrates be grown to reduce the on-resistance (RON-SP) for the back side diodes. We also show that dislocations appear to strongly affect diode properties such as the ideality factor, but their effect on the breakdown voltage appears to be a less significant problem than was previously thought.

关键词：电子信息；电子；氮化镓；高功率

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We consider the set of continuous-time1 audio signals {s1(t), s2(t), . . . , sM(t)} corresponding to M different microphones, and the problem of finding the location of a sound source in a three-dimensional space, identified by a coordinate vector x = (x, y, z). In the general case we can consider that signals si(t) had been prefiltered to improve performance.

关键词：体积积分；分支定界；三维空间

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There is an increasing number of cloud platforms emerging in both academia and industry. They often federate resources from multiple infrastructures in order to benefit from the unique features that each presents. After introducing the main capabilities and features of OpenStack, this article addresses the integration of OpenStack-based platforms into larger, heterogeneous multi-cloud infrastructures, taking the EU FP7 BonFIRE project as an integration use case. Ultimately, we aim to contribute to the state of the art and provide guidelines to integrators looking to federate Open Stack testbeds into more complex architectures.

关键词：云联盟；云计算；开放的堆栈

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"Big data" is a term that has been used regularly now for almost a decade, and it — alongwith technologies like NoSQL — are seen as the replacements for the long-successfulRDBMS solutions that use SQL. Today, DB2?, Oracle, Microsoft? SQL Server MySQL, andPostgreSQL dominate the SQL space and still make up a considerable proportion of the overallmarket. Here in Part 2, we will concentrate on how to use HBase and Hive for exchanging datawith your SQL data stores. From the outside, the two systems seem to be largely similar, butthe systems have very different goals and aims. Let's start by looking at how the two systemsdiffer and how we can take advantage of that in our big data requirements.

关键词：数据存储；交换；空间；大数据

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Big data in its raw form rarely satisfies the Hadoop developer's data requirements forperforming data processing tasks. Different extract/transform/load (ETL) and pre-processingoperations are usually needed before starting any actual processing jobs. Oozie is a frameworkthat helps automate this process and codify this work into repeatable units or workflows thatcan be reused over time without the need to write any new code or steps. Learn how Oozie canbe used to create different types of workflows.

关键词：数据处理；自动化；一致性

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We are in the middle of another revolution in information processing and distribution. After the invention of script and then print, pictures are taking over again. The number of gadgets with displays is larger than the world population. On average every single person on earth owns at least one device with a display on it. These displays are the portals to everything we do: communicating, reading, shopping, learning etc. But are they up to the job? The most successful display technology to date is still the liquid crystal display. It is a well established technology which can be scaled in size from small to large and, depending on the drive electronics, has no significant inherent limits to resolution. However, poor light efficiency and data congestion caused by high pixel densities are still technical challenges in need of good solutions. Could electrophoresis in a liquid crystal host be the answer? The fundamental basics and technical challenges of this interesting new approach will be discussed.

关键词：液晶；电泳；显示器

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Get an overview of the Weka classification engine and learn how to create a simple classifierfor programmatic use. Understand how to store and load models, manipulate them, and usethem to evaluate data. Consider applications and implementation strategies suitable for theenterprise environment so you turn a collection of training data into a functioning model for real-time prediction.

关键词：Weka分类引擎；编程；评估数据

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In recent years, malware has grown extremely rapidly in complexity and rates of system infection. Current generation anti-virus and anti-malware software provides system protection through the use of locally installed monitoring agents, which are dependent upon vendor generated signature and heuristic based rules. However, because these monitoring agents are installed within the systems they are trying to protect, they  hemselves are potential targets of attack by malware. Pathogen overcomes this issue by using a real-time system monitoring and analysis framework that utilises Virtual Machine introspection (VMI) to allow the monitoring of a system without the need for any locally installed agents. One of the main research problems in VMI is how to parse and interpret the memory of an executing system from outside of that system. Pathogen's contribution is a lightweight introspection framework that bridges the semantic gap.

关键词：信息安全；监控；自省；恶意软件

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Patterns contain best practices and expertise for complex tasks, distilled from repeatedreal-world engagements; they help define good solutions in a clear format that addressesreoccurring problems. Organizations planning to implement a cloud presence should look at"cloud adoption patterns" as a way to start that process. The authors detail how to apply cloudadoption patterns — with each pattern outlined with its specific characteristics — to supportthe business and technical requirements of your organization's cloud implementation. Theexamples explain how a cloud solution provider can build private and public clouds to houseclient applications either fully in a cloud environment (like those provided by IBM? cloud serviceofferings) or partially in the cloud and partially on-premise.

关键词：原发性混合云；饱满云；关键用户；云计算

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Memristive devices are two terminal electrical resistance switches that can retain a state of internal resistance based on the history of applied voltage and current. These devices can be used for computing by both storing and processing information. The switching mechanisms, applications and challenges are reviewed in this paper.

关键词：忆阻器；转换；跨过记忆的设备；计算

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