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2. tvGP-VAE: Tensor-variate Gaussian Process Prior Variational Autoencoder

Author

Campbell, Alex and Liò, Pietro

Subjects
Computer Science - Machine Learning, Statistics - Machine Learning
Abstract

Variational autoencoders (VAEs) are a powerful class of deep generative latent variable model for unsupervised representation learning on high-dimensional data. To ensure computational tractability, VAEs are often implemented with a univariate standard Gaussian prior and a mean-field Gaussian variational posterior distribution. This results in a vector-valued latent variables that are agnostic to the original data structure which might be highly correlated across and within multiple dimensions. We propose a tensor-variate extension to the VAE framework, the tensor-variate Gaussian process prior variational autoencoder (tvGP-VAE), which replaces the standard univariate Gaussian prior and posterior distributions with tensor-variate Gaussian processes. The tvGP-VAE is able to explicitly model correlation structures via the use of kernel functions over the dimensions of tensor-valued latent variables. Using spatiotemporally correlated image time series as an example, we show that the choice of which correlation structures to explicitly represent in the latent space has a significant impact on model performance in terms of reconstruction., Comment: 8 pages, 2 Figures

Published
2020

12. Sustainability Taking Flight

Author

Petrovic, Emina, Campbell, Alex, Petrovic, Emina, and Campbell, Alex

Abstract

This research project, Sustainability Taking Flight, explores the paradoxical relationship between the aviation industry and environmentally sustainable architecture. Developed around the middle of the twentieth century as an expression of modernism, today the continual growth of air travel makes it one of the largest contributors to global greenhouse emissions. This makes the airport itself both an expression of the modern and globalized and a celebration of a manifestation identifying the unsustainable. This research portfolio assumes that sustainable architecture has become an idea of paramount importance, and therefore uses the airport as a tool to examine what constitutes sustainability for an airport complex. Through literature, design evaluations and design explorations this research portfolio attempts to develop a design for an airport which communicates and embodies environmental responsive outcomes. Technology, programme analysis, art and educational design processes become unlikely contributors toward the sustainable design of the airport as well as applications of passive and site responsive design techniques, biophillic design principles and inclusion of local historical influences. Despite the paradox of the aviation industry and environmental sustainability, the airport complex can successfully embody at least some aspects of environmental sustainability through careful design development of the whole complex, rather than just the building in isolation.

Published
2020

14. Long-term survival in patients with refractory angina

Author

Henry, Timothy D., Satran, Daniel, Hodges, James S., Johnson, Randall K., Poulose, Anil K., Campbell, Alex R., Garberich, Ross F., Bart, Bradley A., Olson, Rachel E., Boisjolie, Charlene R., Harvey, Karen L., Arndt, Theresa L., and Traverse, Jay H.

Published
2013
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18. Livermore on the defensive

Author

Collina, Tom Zamora and Campbell, Alex

Subjects
United States. Department of Energy -- Management, United States. Lawrence Livermore National Laboratory -- Management, Nuclear weapons -- Political aspects, International relations, Military and naval science, News, opinion and commentary, Company business management, Management, Political aspects
Abstract

Since the end of the Cold War, the future of the U.S. nuclear weapons laboratories has been in question. Budget cutters, arms controllers, and defense conversionists have been eyeing the [...]

Published
1995

19. Abstract QS9

Author

McCullough, Meghan, primary, Ly, Steven, additional, Campbell, Alex, additional, Yao, Caroline, additional, Urata, Mark, additional, Scherer, Stefan, additional, and Magee, William P., additional

Published
2019
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21. Microbial synthesis of plant alkaloids

Author

Schwab, Wilfried, Lange, Bernd Markus, Wüst, Matthias, Pyne, Michael E., Narcross, Lauren, Hansen, Cecilie Ida Cetti, Campbell, Alex, Davies, Meghan E., Bourgeois, Leanne, Fossati, Elena, Martin, Vincent J.J., Schwab, Wilfried, Lange, Bernd Markus, Wüst, Matthias, Pyne, Michael E., Narcross, Lauren, Hansen, Cecilie Ida Cetti, Campbell, Alex, Davies, Meghan E., Bourgeois, Leanne, Fossati, Elena, and Martin, Vincent J.J.

Published
2018

22. Application of laser scanning to measure fragmentation in underground mines

Author

Campbell, Alex, Thurley, Matthew, Campbell, Alex, and Thurley, Matthew

Abstract

The particle size distribution of fragmented rock in mines significantly affects operational performance of loading equipment, materials handling and crushing systems. A number of methods to measure rock fragmentation exist at present, however these systems have a number of shortcomings in an underground environment. This paper outlines the first implementation of high resolution 3D laser scanning for fragmentation measurement in an underground mine. The system is now used routinely for fragmentation measurement at the Ernest Henry sublevel-cave mine following extensive testing and calibration. The system is being used to study the effects of blasting parameters on rock fragmentation to optimise blast design. Results from 125 three dimensional scans measured the average P50 and P80 to be 230mm and 400mm respectively. The equipment, methodology and analysis techniques are described in detail to enable application of the measurement system at other mines., Validerad;2018;Nivå 1;2017-12-21 (andbra)

Published
2017
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29. How to get started with Linux: A beginner’s guide.

Author

HOFFMAN, CHRIS and CAMPBELL, ALEX

Subjects
*LINUX operating systems, *VIRTUAL machine systems, *DESKTOP environments (Computer interfaces), *UBUNTU (Operating system)
Abstract

The article offers instructions on how to use the Linux computer operating system. It covers how to select a Linux distribution to use and provides links to programs such as DistroWatch, Linux Mint, and Ubuntu. Other topics covered include operating Linux from a external hard drive, using Linux in a virtual machine (VM), and creating a desktop environment.

Published
2017

30. Mulgrew will flower with Scotland, says Lennon

Author

Campbell, Alex

Subjects
General interest
Abstract

Byline: Alex Campbell Celtic 1 Hooper 59 Motherwell 0 Att: 53,486 Neil Lennon expects Charlie Mulgrew to adapt easily to the international scene when he joins up with the Scotland [...]

Published
2012

31. Chemical, physical and mineralogical properties associated with the hardening of some South African fly ashes

Author

Campbell, Alex E, Fey, Martin V, and Willis, James

Subjects
Geological Sciences, Environmental Geochemistry
Abstract

Coal combustion for power generation is relied on heavily in South Africa. The main residue from the combustion process is fly ash, with about 22 million tons being produced in 1994, of which only about 1 million tons is utilised, the remainder requiring disposal as waste. Various environmental impacts are associated with the disposal of fly ash in surface impoundments, including loss of usable land, contamination of groundwater, and production of wind-blown particulates, effects on vegetation and aesthetic impacts. Ultimately the disposal of fly ash in the mined-out underground workings is highly sought after, as it may limit many of the impacts which fly ash induces on the environment. The main purpose of this study was to assess the degree of hardening of four South African fly ashes from power stations at Kriel, Lethabo, Matla and Sasol in terms of their chemical, physical and mineralogical properties. Samples were taken of fresh and unweathered ashes from each power station. Unweathered ash samples analysed by XRFS were found to have high contents of Si0 2 (49.9-56.3%), Al 2 0 3 (27.2-31.5%), CaO (4.2-8.6%Y and Fez03 (3.1-3.9%) with varying contributions from loss on ignition (L.O.I.) (0.4-4.4%) and MgO (1.1- 2.2%). The major mineral phases detected in unweathered ash by XRD include quartz, mullite and glass, with smaller contributions from hematite and lime. Laser particle size analysis and liquid limit determination (Atterberg tests) were also conducted. The exceptionally high L.O.I of Sasol ash (4.4%) was attributed to the presence of partially burned coal, based on DTA and TGA investigation. Modulus of rupture experiments were conducted on briquettes (dimensions 7.0 x 3.5 x 1.0 em) of unweathered ash from Kriel, Matla, Lethabo and Sasol, which were wetted to their liquid limit and cured for 24 h under ambient conditions. The tests indicated that there is a strong linear relationship between total Ca content and the modulus of rupture for 3 of the 4 unweathered ashes. The fly ash from Kriel deviates from this relationship, providing evidence that other chemical (e.g. form of Ca) and physical factors (e.g. particle size) may also play a role in hardening.

Published
1999

32. Interview with Dr. James Lightner (1 of 2)

Author

Campbell, Alex; Lightner, James; Community Media Center (Carroll County, Md.) and Campbell, Alex; Lightner, James; Community Media Center (Carroll County, Md.)

Abstract

Video interview conducted on November 13, 2009 with Dr. James Lightner on the subject of living in Carroll County, Maryland. The interviewer was Alex Campbell .

Published
2009

33. How to have a Linux home server on the cheap.

Author

CAMPBELL, ALEX

Subjects
*LINUX operating systems, *COST control, *CLIENT/SERVER computing, *COMPUTER software sales & prices, *VIRTUAL private networks
Abstract

The article discusses the methods of reducing the cost involved in having a Linux operating system as a home computer server. Topics, including virtual private servers (VPSs), network attached storage (NAS) appliances and the use of free, open-source computer software, are discussed.

Published
2017

34. The new Dell XPS 13 Developer Edition is the little Linux laptop that can.

Author

CAMPBELL, ALEX

Subjects
*LAPTOP computers, *LINUX operating systems
Abstract

The article evaluates XPS 13 Developer Edition with Linux operating system laptop and features including technology provider, Intel's Kaby Lake central processing unit (CPU) and Ubuntu 16.04 from computer technology company Dell.

Published
2017

35. Why Linux users should worry about malware and what they can do about it.

Author

CAMPBELL, ALEX

Subjects
*LINUX operating systems, *VIRTUAL private networks, *FIREWALLS (Computer security), *COMPUTER virus prevention, *BACK up systems
Abstract

The article talks about care consumers using UNIX-like operating systems such as Mac OS X and Linux need to take as threats though fewer do exist. It talks of keeping the systems updated at least once in two weeks, avoiding open wi-fi networks and prefer a virtual private network (VPN), and install firewalls that denies access to incoming connections. It also suggests to run an antivirus scan, and back up data for easy recovery.

Published
2017

38. 4 ways to block political posts on Facebook.

Author

CAMPBELL, ALEX

Subjects
*SOCIAL media & politics, *ONLINE social networks, *INTERNET & politics, *CUSTOMIZATION
Abstract

The article offer tips and advice to computer users for blocking political posts and content on the Facebook online social media network. Emphasis is given to topics such as use of the Remove All Politics From Facebook filter, the Social Fixer feed customization tool, and the News Feed Eradicator add-on feature.

Published
2017

39. 4 Linux projects for newbies and intermediate users.

Author

CAMPBELL, ALEX

Subjects
*LINUX operating systems, *COMPUTER literacy, *COMPUTER users, *CLIENT/SERVER computing, *DATA encryption, *BACK up systems
Abstract

The article offers information on projects for Linux computer operating systems with an Ubuntu or Fedora server. Emphasis is given to topics such as customization of workflow, learning how public-key encryption tools function, the use of local backup programs such as rsync, and building network attached storage.

Published
2017

42. 5 terminal commands every Linux newbie should know.

Author

CAMPBELL, ALEX

Subjects
*LINUX operating systems, *COMPUTER operating systems, *COMPUTERS, *COMPUTER software, *SYSTEMS software
Abstract

The article discusses five terminal commands that new Linux operating system users need to know. These terminal commands include sudo, package manager tools such as yum, apt, or pacman, systemctl (Systemd), ls, and man. Topics covered include how console commands in Linux show errors and provide the fastest way to update the system.

Published
2016

43. Feline Focus

Author

Malik, Richard, primary, Fawcett, Anne, additional, Page, Stephen W, additional, Seavers, Aine, additional, Campbell, Alex, additional, Sutton, Nick, additional, Sparkes, Andy, additional, Tiffin, Ross, additional, and Bessant, Claire, additional

Published
2011
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44. ST-Elevation Myocardial Infarction

Author

Campbell, Alex R., primary, Satran, Daniel, additional, Larson, David M., additional, Chavez, Ivan J., additional, Unger, Barbara T., additional, Chacko, Barbara P., additional, Kapsner, Christopher, additional, and Henry, Timothy D., additional

Published
2009
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45. Make a furiously-fast Core i5 desktop PC.

Author

Campbell, Alex

Subjects
COMPUTER operating systems, PERSONAL computers
Abstract

The article offers step-by-step instructions for making a fast Core i5 operating systems desktop personal computer (PC).

Published
2016

46. The VR Gaming Rig Revisited.

Author

CAMPBELL, ALEX

Subjects
PERSONAL computers, COMPUTER input-output equipment
Abstract

The article offers step-by-step instructions for assembling a solid gaming personal computer (PC).

Published
2016

47. A Home-Brewed Steam Machine.

Author

CAMPBELL, ALEX

Subjects
STEAMOS (Operating system), RANDOM access memory, BOXES
Abstract

The article offers information on steam machines such as Steam Operating System (OS) and Windows and mentions its types. Topics discussed include Linux-based OS from Valve which runs Steam in Big Picture Mode; Asus Z97IPlus mobo and an Intel Core i5-4590, with 8GB of Corsair Vengeance DDR3 Random access memory (RAM); the ML087 OS which comes with a handle that is attached to the case with four screws.

Published
2016

48. Re-use your old PC as a no-cost NAS.

Author

Campbell, Alex

Subjects
PERSONAL computers, COMPUTER storage devices
Abstract

The article offers step-by-step instructions for converting personal computers into network-attached storage (NAS) device.

Published
2016

49. The Poor Man's NAS Setup.

Author

CAMPBELL, ALEX

Subjects
NETWORK-attached storage, SOFTWARE upgrades
Abstract

The article offers step-by-step instructions for building a network attached storage (NAS) after a computer upgrade using the old components.

Published
2016

50. Team Red Comes Back in Black.

Author

CAMPBELL, ALEX

Subjects
PERSONAL computer design & construction, COMPUTER peripherals
Abstract

A personal narrative is presented which explores the author's experience of building a gaming computer using high-end AMD parts.

Published
2016

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