6,111 research outputs found
A PC parallel port button box provides millisecond response time accuracy under Linux
Full text linkFor psychologists, it is sometimes necessary to measure people's reaction times to the nearest millisecond. This article describes how to use the PC parallel port to receive signals from a button box to achieve millisecond response time accuracy. The workings of the parallel port, the corresponding port addresses, and a simple Linux program for controlling the port are described. A test of the speed and reliability of button box signal detection is reported. If the reader is moderately familiar with Linux, this article should provide sufficient instruction for him or her to build and test his or her own parallel port button box. This article also describes how the parallel port could be used to control an external apparatus
Successful resuscitation of acute massire pulmonary embolism with extracorporeal membrane oxygenation and open embolectomy.
No full textIs There an Impact of Household Computer Ownership on Childrens Educational Attainment in Britain?
Full text linkIf personal computers (PCs) are used to enhance learning and information gathering across avariety of subjects, then a home computer might reasonably be considered an input in aneducational production function. Using data on British youths from the British HouseholdPanel Survey between 1991 and 2001, this paper attempts to explore the link betweenownership of a home computer at ages 15 and 17 and subsequent educational attainment inthe principal British school examinations taken at ages 16 (GCSEs) and 18 (A levels). Thedata show a significant positive associatio n between PC ownership and both the number ofGCSEs obtained and the probability of passing five or more GCSEs. These results survive aset of individual, household, and area controls, including using other household durables and\"future\" PC ownership as proxies for household wealth and other unobservable householdlevel effects. Home computer ownership is also associated with a significant increase in theprobability of passing at least one A level conditional on having passed five and increase inthe probability of successfully completing three or more A levels, conditional on havingpassed at least one A level.Human capital, Economic Impact, Personal Computers
Millisecond accuracy video display using OpenGL under Linux
Full text linkTo measure people’s reaction times to the nearest millisecond, it is necessary to know exactly when
a stimulus is displayed. This article describes how to display stimuli with millisecond accuracy on a
normal CRT monitor, using a PC running Linux. A simple C program is presented to illustrate how this
may be done within X Windows using the OpenGL rendering system. A test of this system is reported
that demonstrates that stimuli may be consistently displayed with millisecond accuracy. An algorithm
is presented that allows the exact time of stimulus presentation to be deduced, even if there are relatively
large errors in measuring the display time
Frontmatter (Titlepage, Table of Contents, Author List, PC List, Reviewer List)
No full textFront matter including table of contents, author list, PC list, and reviewer list
Structure-property relationships in glass reinforced polyamide, part 2: The effects of average fiber diameter and diameter distribution
No full textWe present the results of an extensive study of the influence of average fibre diameter and the width of the diameter distribution on the performance of injection moulded glass-fibre reinforced polyamide 66. In the average fibre diameter range from 9-18m dry-as-moulded (DaM) composite unnotched impact and tensile strength decreased significantly. The composite notched impact performance and tensile modulus showed little dependence on fibre diameter. The influence of broadening the fibre diameter distribution by blending glass fibre samples of different average diameter was found to be particularly negative on the level of composite unnotched impact when compared at equal number average diameter. After hydrolysis treatment the composite tensile strength and modulus exhibited a large drop compared to the DaM results. In contrast, the unnotched impact results became insensitive to fibre diameter after hydrolysis. The average level of unnotched impact after hydrolysis was sufficiently high to show an increase over DaM when the fibre diameter was above 14m. Residual fibre length correlated significantly with fibre diameter with a lower average length for thinner fibres. The interfacial shear strength was found to be in the range of 26-34 MPa for DaM composites. There was a highly significant inverse correlation between the DaM interfacial strength and the average fibre diameter. It is shown that results from both tensile and unnotched impact measurements can be brought back to single trend lines by using a Z average value for the average fibre diameter which is more heavily weighted to the thicker fibres in the distribution
Subthalamic Nucleus Location: Relationships between Stereotactic AC-PC-Based Diagrams and MRI Anatomy-Based Contours
No full textInternational audienceSubthalamic nucleus (STN) targeting is classically performed based on AC-PC probabilistic position. Nevertheless, MRI allows direct visualization and targeting. We aimed to compare the position localized on MR images with standard stereotactic diagrams. The STN was manually contoured on MR images (22 Parkinson's disease patients); boundaries were simplified in a schematic polygonal form. Front and lateral stereotactic diagrams were constructed according to Talairach and Benabid. We compared x, y and z coordinates of the geometrical center of MRI-based polygons and stereotactic diagrams (Wilcoxon matched-pairs tests). There was significant discordance between MRI-based polygons and AC-PCbased images. MRI shows the STN as more posterior, medial and slightly inferior
High efficiency implementation of PC and PC stable algorithms yields three-dimensional graphs of information flow for the Earth' atmosphere
Full text linkSeptember 3, 2014.Causal discovery algorithms have recently been applied to several climate applications. In particular, in prior work we have developed methods to recover pathways of interaction in the global climate system, using the classic PC algorithm. However, standard implementations of the PC algorithm cannot handle the large number of variables and temporal models required for this application. This technical report shows that a more efficient implementation of the PC algorithm can provide speed gains of a factor of 1,000 or more. This in turn enables us to calculate graphs of information flow with much higher resolution grids. Furthermore, we can now - for the first time ever - calculate information flow graphs that extend over three dimensions, i.e. rather than just including one layer of the planet's atmosphere we can now capture interactions across several height layers
Noise Source Impedance Extraction Method of Switched-Mode Power Supply (SMPS) in PC According to the Frequency Range
No full textImpedance is essential information in solving electromagnetic compatibility problems. This paper proposes a method to measure the noise source impedance of a switched-mode power supply (SMPS) in a PC under operating conditions. Unlike previous research, impedance measurements at low frequencies below 1 MHz increase the received signal using the proposed dual current probe (DCP) method. In particular, unlike conventional research, this method can increase accuracy by increasing the number of wire turns without an amplifier or attenuator. Therefore, the proposed noise source impedance extraction method can be used to solve electromagnetic compatibility (EMC) problems such as electromagnetic interference filter design or to analyze the influence of external electromagnetic pulse
State variable simulation package for IBM-PC
No full textThis thesis was scanned from the print manuscript for digital preservation and is copyright the author.
Researchers can access this thesis by asking their local university, institution or public library to
make a request on their behalf. Monash staff and postgraduate students can use the link in the References field
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