1,393 research outputs found
Teaching ethics:intersectionality, care failure and moral courage
Highlights• Provides a critical discussion of ethics teaching arguing that it must recognise begin to recognise frameworks from outside the Anglo-European tradition.• Drawing on examples of care failure, racism and sexism, argues that there is evidence that some nurses struggle to practice in accordance with ethical guidance.• Identifies intersectionality, the culture of practice and moral courage as fundamental to enabling nurses to practice in accordance with ethical guidance• Presents a case for an approach to applied approach ethics education, which recognises the complexity and diversity of practice
Short timescale behavior of colliding heavy nuclei at intermediate energies
An Antisymmetrized Molecular Dynamics model is used to explore the collision
of Cd projectiles with Mo target nuclei at E/A=50 MeV over a
broad range in impact parameter. The atomic number (Z), velocity, and emission
pattern of the reaction products are examined as a function of the impact
parameter and the cluster recognition time. The non-central collisions are
found to be essentially binary in character resulting in the formation of an
excited projectile-like fragment (PLF) and target-like fragment (TLF).
The decay of these fragments occurs on a short timescale, 100t300
fm/c. The average excitation energy deduced for the PLF and TLF
`saturates for mid-central collisions, 3.5b6 fm, with its magnitude
depending on the cluster recognition time. For short cluster recognition times
(t=150 fm/c), an average excitation energy as high as 6 MeV is
predicted. Short timescale emission leads to a loss of initial correlations and
results in features such as an anisotropic emission pattern of both IMFs and
alpha particles emitted from the PLF and TLF in peripheral collisions.Comment: 19 pages, 17 figure
A Real-Time Path Planner for a Smart Wheelchair Using Harmonic Potentials and a Rubber Band Model
We present an efficient path planner for smart
wheelchairs based on harmonic potential fields. While the use of harmonic fields can always guarantee finding an existing path,
they are extremely computational intensive and a sufficiently detailed map of the environment may lead to an unfeasible solution for the path. Also, since our target application is
for the navigation of a smart wheelchair, for people with severe disabilities, the path provided by the harmonic field is frequently too sharp and needs to be smoothened. In order
to address the first problem, we propose a parallel algorithm implemented using Graphics Processor Units (GPUs) on the Compute Unified Device Architecture (CUDA) platform. And
for the second problem, we developed a rubber band model that provides extra forces to be added to the attracting forces of the
harmonic fields. This model assumes that the path is an elastic line, a rubber band, connecting the source and destination points. This rubber band simulates the internal tension forces trying to tighten the line. As the result section demonstrates, both the original path from the harmonic field alone and the path smoothened by the rubber band model have approximate the same length, but the first path contains many bumps, sharp
angles, and zig-zags, while the second one provides a much more comfortable ride for the passenger of the wheelchair. Either one is executed in real-time, allowing the proposed method to be used for real navigation of smart wheelchairs
3D Human Modeling using Virtual Multi-View Stereopsis and Object-Camera Motion Estimation
This paper presents a method for multi-view
3D modeling of human bodies using virtual stereopsis. The algorithm expands and improves the method used in [5], but unlike that method, our approach does not require multiple calibrated cameras and/or carefully-positioned turn tables. Instead, an algorithm using SIFT feature extraction is employed and an accurate motion estimation is performed to calculate the position of virtual cameras around the object. That is, by employing a single pair of cameras mounted on a same tripod, our algorithm computes the relative pose between camera and object and creates virtual cameras from the consecutive images in the video sequence. Besides not requiring any special setup, another advantage of our method is in the simplicity to obtain denser models if necessary: by only increasing the number of sampled images during the object-camera motion. As the quantitative results presented here demonstrate, our method compares to the PMVS method, while it makes it much simpler and cost-effective to implement
Subarachnoid haemorrhage secondary to traumatic intracranial aneurysm of the posterior cerebral circulation: case series and literature review
Background
To identify the clinical features, rebleed risk, timing and method of diagnosis, complications and outcome for subarachnoid haemorrhage (SAH) from traumatic intracranial aneurysm (TICA) of the posterior circulation. Subjects included 26 patients aged 3–54 (mean 24.8).
Methods
Case series and literature search to identify all reported cases.
Results
In our series, two of three cases were fatal as a result of rebleed, and one case had a good outcome with no deficit, following prompt diagnosis and embolisation. Our key findings from the literature review were: 30.7 % of patients were age 16 and under; 88 % had an acute drop in consciousness, 46 % in a delayed manner; the mean time to diagnosis was 7.5 days; initial cerebrovascular imaging was normal in 23 %; the rebleed rate was 23 %; 61 % required emergency diversion of cerebrospinal fluid; 11 % developed vasospasm requiring treatment; 19.2 % had deficits that rendered them unable to live independently. The mortality rate was 27 %.
Conclusions
SAH from ruptured posterior circulation TICA is associated with significant morbidity and mortality. A high index of suspicion as well as prompt diagnosis, repeat imaging in selected cases, and treatment of any associated TICA can be crucial to a favourable outcome
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