This thesis shares our experience in designing web crawlers that scale to billions of pages and models their performance. We show that with the quadratically increasing complexity of verifying URL uniqueness, breadth-first search (BFS) crawl order, and fixed per-host rate-limiting, current crawling algorithms cannot effectively cope with the sheer volume of URLs generated in large crawls, highly-branching spam, legitimate multi-million-page blog sites, and infinite loops created by server-side scripts. We offer a set of techniques for dealing with these issues and test their performance in an implementation we call IRLbot. In our recent experiment that lasted 41 days, IRLbot running on a single server successfully crawled 6:3 billion valid HTML pages (7:6 billion connection requests) and sustained an average download rate of 319 mb/s (1,789 pages/s). Unlike our prior experiments with algorithms proposed in related work, this version of IRLbot did not experience any bottlenecks and successfully handled content from over 117 million hosts, parsed out 394 billion links, and discovered a subset of the web graph with 41 billion unique nodes.

Mass Media has developing rapidly, thus to managers, performance is required in order to earn more profits and increase efficiency. The key factor of success is ¡§person¡¨, especially journalists. The media demands for more capable employees than other enterprises results from the content of the media is their tool for competition, therefore, it is hard to survive without substantial content. As to detain fine journalists, the impartial performance appraisal is bound to be built. The performance appraisal of journalists is different from other walks of life, for there are more abstract ideas which are hard to be presented by statistics. This research aims to examine whether the appraisal of journals meet the criterion with the system which apply to businesses customarily. Also there are opinions form employees who accepted this system. The target of is the journalists in Kaohsiung who are respectively belong to Apple Daily, The Liberty Times, United Daily News and China Times which are regarded as the ¡§four major newspapers¡¨, questionnaire is formulated as to realize their viewpoints. And according to these results, the research conducts interviews to the correspondents or conveners of the ¡§four major newspapers¡¨ in order to know how they give their appraisals. That is, asking objects for answering the questionnaire then pursuing qualitative research. Owing to the journalists and correspondents have mostly covered the news for long in local regions, their opinions can be taken as the reference for the performance appraisal of journalists; moreover, it can also be taken as to examine the difference of performance appraisal between mass media and enterprises. The result shows that, the procedure and distribution of performance appraisal has profound effect on the aspect of working attitude, devotion and promise-making. However, there¡¦s still no convincing criterion for performance appraisal of the domestic ¡§four major newspapers¡¨. As a result, under the drastic pressure of competition in mass media, an acknowledged system should be built in order to cultivate excellent journalists, enforce their promises to organization and favor the management of newspaper offices.

Thesis PlanB (M.S.)--University of Wisconsin--Stout, 2009. / Includes bibliographical references.

Antenna performance software is a tool to measure the quality and enactment of the newly developed products. This is an important matter to the development department of the company since the products must be verified to work with regarding to the user specifications. Using LabView, this tool has been developed in order to provide ease for this test. This software has been compared with previous solutions given and has been optimized to be able to do the tests successfully.

Efficient Transfer of Graphene –Physical and Electrical Performance Perspective Graphene has become one of the most widely used atomic crystal structure materials since its first experimental proof by Geim-Novoselov in 2004 [1]. This is attributed to its reported incredible carrier mobility, mechanical strength and thermal conductivity [2] [3] [4]. These properties suggest interesting applications of Graphene ranging from electronics to energy storage and conversion [5]. In 2008, Chen et al reported a 40,000 cm2V-1s-1 mobility for a Single Layer Graphene (SLG) on SiO2 compared to 285 cm2V-1s-1 for silicon channel devices [6]. Chemical vapor deposition (CVD) is a common method for growing graphene on a metal surface as a catalyst for graphene nucleation. This adds a necessary transfer step to the target substrate ultimately desired for graphene devices fabrication. Interfacing with graphene is a critical challenge in preserving its promising high mobility. This initiated the motivation for studying the effect of intermediate interfaces imposed by transfer processes. In this work, few layers graphene (FLG) was grown on copper foils inside a high temperature furnace. Then Raman spectroscopy was performed on grown graphene sample to confirm few (in between 3-10) layers. Afterwards the sample was cut into three pieces and transferred to 300 nm SiO2 on Si substrates using three techniques, namely: (i) pickup transfer with top side of Graphene brought in contact with SiO2 [7], (ii) Ploy (methyl methacrylate) (PMMA) transfer with Graphene and a PMMA support layer on top scooped from bottom side [8], and (iii) a modified direct transfer which is similar to PMMA transfer without the support layer [9]. Comparisons were done using Raman spectroscopy to determine the relative defectivity, Scanning Electron Microscopy (SEM) to observe discontinuities and Atomic Force Microscopy (AFM) to measure surface roughness. Then we conclude with electrical data based on the contact resistivity measured for layers transferred using these different techniques. Contacts were deposited using e-beam thermal evaporation and contact resistivity was calculated using Transmission Line Method (TLM) [10]. To date no comparative analysis for the aforementioned transfer methods has been done to determine which is the most efficient [5]. Our contributions are: (i) determining the most efficient method, (ii) reporting a lift-off process for Graphene, (ii) and reporting lower specific contact resistivity for no-post transfer processing Graphene.

No description available.

Albert Herring / Benjamin Britten / text

Albert Herring / Benjamin Britten / text

No description available.

We present a study of the effects of structural holds and rigidity of a flexible display on touch pointing and dragging performance. We discuss an observational study in which we collected common holds used when pointing on a mock-up paper display. We also measured the force patterns each hold generated within the display surface. We analyzed this data to produce 3 force zones in the display for each of the four most frequently observed holds: the grip zone, rigid zone, and the flexible zone. We report on an empirical evaluation in which we compared the efficiency of pointing and dragging operations between holds, and between structural zones within holds, using a real flexible Lumalive display. Results suggest that structural force distributions in a flexible display affect the Index of Performance of both pointing and dragging tasks, irrespective of hold, with rigid parts of the display yielding a 12% average performance gain over flexible areas. / Thesis (Master, Computing) -- Queen's University, 2011-08-29 12:41:13.725