Reviving First Person Understanding in Ethical Inquiry

Virtue Ethicists who follow the arguments set out in Elizabeth Anscombe’s Modern Moral Philosophy have consistently referenced problems with modern ethical thought. It is unclear, however, whether a single theme unites their dissatisfaction. Discovering ‘the problem’ is important for two reasons: first, it is, itself, historically interesting were there to emerge a common thread running through modernity; second, it is potentially insightful for providing future direction to ethicists. In the following two sections I argue, respectively, that such a theme underlies modern ethics and, further, that it is problematic. In Section I, I take up three influential dichotomies. I situate historical claims made by Alasdair MacIntyre (1982) and Iris Murdoch (1970) into a broader framework. MacIntyre argues that each Hume, and Kant and Reid incorrectly reduce the content of ethical thought to an impersonal moral value. Iris Murdoch, however, argues the problem with modern ethical thought is that it either concerns only overt actions, the behaviorist tradition, or internal movements of the will, the existentialist tradition. I argue that the problems described by MacIntyre and Murdoch are explained by a false dichotomy between Empiricists and Rationalists. Each neglect that apprehending morality requires first person understanding, that is, a method of understanding, which includes the world as it appears through the senses and my unique perspective. The problem of modern ethics is, therefore, one about methodology. In Section II, I argue that first person understanding is necessary for a complete account of ethics. I move forward in two stages. First, I argue that first person understanding is indispensible to human action. In order to act, I must see doing so as choiceworthy, but this requires both my first and third person understanding. Hence, a gap emerges between why I act and why I am approved by modern ethics. Second, I argue that the gap is problematic: first it reduces the scope of moral inquiry; second, it separates morality from flourishing; third, it undercuts attempts to explain ethical overridingness. If this is plausible, it is important for theorists to reconsider the role of first person understanding in moral inquiry

Profiling the Sport Blogosphere

The purpose of this study is to provide primary research regarding how sports blogs utilize the social media and generate revenue for their blog. This study begins with a literature review of the blogging world with a special emphasis on the sports sector of the blogosphere. The literature review is followed by a discussion of the research method of content analysis, which was employed to examine the selected sports blogs. Furthermore, recommendations are made concerning sampling methods and how future statistical sampling of the sports blogosphere could proceed to improve the representativeness of samples and data collection in this research topic

A clustering approach for optimizing beam angles in IMRT planning

In this paper we introduce a p-median problem based clustering heuristic for selecting efficient beam angles for intensity-modulated radiation therapy. The essence of the method described here is the clustering of beam angles according to probability that an angle will be observed in the final solution and similarities among different angles and the selection of a representative angle from each of the p resulting cluster cells. We conduct experiments using several combinations of modeling parameters to find the conditions where the heuristic best performs. We found a combination of such parameters that outperformed all other parameters on three of the four tested instances

Solving the p-Median Problem with Insights from Discrete Vector Quantization

The goals of this paper are twofold. First, we formally equate the p-median problem from facility location to the optimal design of a vector quantizer. Second, we use the equivalence to show that the Maranzana Algorithm can be interpreted as a projected Lloyd Algorithm, a fact that improves complexity. Numerical results verify significant improvements in run-time

Molecular dynamics in arbitrary geometries : parallel evaluation of pair forces

A new algorithm for calculating intermolecular pair forces in molecular dynamics (MD) simulations on a distributed parallel computer is presented. The arbitrary interacting cells algorithm (AICA) is designed to operate on geometrical domains defined by an unstructured, arbitrary polyhedral mesh that has been spatially decomposed into irregular portions for parallelisation. It is intended for nano scale fluid mechanics simulation by MD in complex geometries, and to provide the MD component of a hybrid MD/continuum simulation. The spatial relationship of the cells of the mesh is calculated at the start of the simulation and only the molecules contained in cells that have part of their surface closer than the cut-off radius of the intermolecular pair potential are required to interact. AICA has been implemented in the open source C++ code OpenFOAM, and its accuracy has been indirectly verified against a published MD code. The same system simulated in serial and in parallel on 12 and 32 processors gives the same results. Performance tests show that there is an optimal number of cells in a mesh for maximum speed of calculating intermolecular forces, and that having a large number of empty cells in the mesh does not add a significant computational overhead

Fast and Robust Techniques for the Euclidean p-Median Problem with Uniform Weights

We discuss new solution techniques for the p-median problem, with the goal being to improve the solution time and quality of current techniques. In particular, we hybridize the discrete Lloyd algorithm and the vertex substitution heuristic. We also compare three starting point techniques and present a new solution method that provides consistently good results when appropriately initialized

An improved approach to measuring H_0 using X-ray and SZ observations of galaxy clusters

We present an improved method for predicting the Sunyaev-Zeldovich (SZ) effect in galaxy clusters from spatially-resolved, spectroscopic X-ray data. Using the deprojected electron density and temperature profiles measured within a fraction of the virial radius, and assuming a Navarro, Frenk & White (1995) mass model, we show how the pressure profile of the X-ray gas can be extrapolated to large radii, allowing the Comptonization parameter profile for the cluster to be predicted precisely. We apply our method to Chandra observations of three X-ray luminous, dynamically relaxed clusters with published SZ data: RX J1347.5-1145, Abell 1835 and Abell 478. Combining the predicted and observed SZ signals, we determine improved estimates for the Hubble constant from each cluster and obtain a weighted mean of H_0=69\pm8km/s/Mpc for a cosmology with Omega_m=0.3 and Omega_Lambda=0.7. This result is in good agreement with independent findings from the Hubble Key Project and the combination of cosmic microwave background and galaxy cluster data.Comment: 9 pages, 2 figures, 4 tables. Accepted for publication in MNRA

The Effect of Helium Sedimentation on Galaxy Cluster Masses and Scaling Relations

Recent theoretical studies predict that the inner regions of galaxy clusters may have an enhanced helium abundance due to sedimentation over the cluster lifetime. If sedimentation is not suppressed (e.g., by tangled magnetic fields), this may significantly affect the cluster mass estimates. We use Chandra X-ray observations of eight relaxed galaxy clusters to investigate the upper limits to the effect of helium sedimentation on the measurement of cluster masses and the best-fit slopes of the Y_X - M_500 and Y_X - M_2500 scaling relations. We calculated gas mass and total mass in two limiting cases: a uniform, un-enhanced abundance distribution and a radial distribution from numerical simulations of helium sedimentation on a timescale of 11 Gyrs. The assumed helium sedimentation model, on average, produces a negligible increase in the gas mass inferred within large radii (r < r500) (1.3 +/- 1.2 per cent) and a (10.2 +/- 5.5) per cent mean decrease in the total mass inferred within r < r500. Significantly stronger effects in the gas mass (10.5 +/- 0.8 per cent) and total mass (25.1 +/- 1.1 per cent) are seen at small radii owing to a larger variance in helium abundance in the inner region, r < 0.1 r500. We find that the slope of the Y_X -M_500 scaling relation is not significantly affected by helium sedimentation.Comment: 11 pages, accepted for publication in Astronomy and Astrophysic