Finito: A Faster, Permutable Incremental Gradient Method for Big Data Problems

Recent advances in optimization theory have shown that smooth strongly convex finite sums can be minimized faster than by treating them as a black box "batch" problem. In this work we introduce a new method in this class with a theoretical convergence rate four times faster than existing methods, for sums with sufficiently many terms. This method is also amendable to a sampling without replacement scheme that in practice gives further speed-ups. We give empirical results showing state of the art performance

Guarding International Borders Against HIV: A Comparative Study in Futility

Back in 1985, when knowledge of HIV began to spread, governments reacted by passing immigration laws to restrict the entry of HIV positive individuals. These laws required such individuals to either declare their HIV status or undergo mandatory HIV testing to secure entry. As justification for these initiatives, many countries claimed to be preserving the public health and their domestic economy. The United States, China, and Russia are three countries that have had, or still have, some form of HIV immigration restrictions. Initially, it may seem logical that preventing HIV positive individuals from entering a country will cut down on the spread of HIV and save the economy from health care costs. Nevertheless, an analysis of the HIV travel restrictions of these three countries will show that the public health and economic reasoning behind such laws is flawed because HIV is not spread by casual contact and because economic goals can be accomplished with less restrictive means. Moreover, this article will further reveal that HIV travel restrictions contribute to several health concerns and create issues with confidentially and stigmatization. In the end, a comparative analysis of these three countries, with specific attention paid to their successes and failures, reveals that the best system is one that works on both an international and domestic level. On the international level, border *90 testing must be voluntary, confidential, and informed. It should also utilize pre and post test counseling, and not be used to restrict entry. On the domestic level, individual countries need to educate the public and create programs to address high-risk groups responsible for the rapid spread of HIV. In doing so, society will find not only that it is more effectively protecting itself from the spread of HIV, but also that it is protecting the HIV community from the stigma and discrimination that contributed to the rapid spread of HIV in the first place

PERVASIVE TECHNOLOGY TO REDUCE ROAD RAGE: A STUDY ON THE EFFECTS OF METABOLIC CHANGES IN INDIVIDUALS WHILE DRIVING

poster abstractSince 1990, there have been 250,000 fatalities from car accidents in the United States (Warp, 2006). According to the United States Department of Transportation (nhtsa.dot.com), two-thirds of those fatalities are from acci-dents caused by road rage. That means 166,666 people died due to driver’s inability to control their anger on the road. Road rage is a serious issue that should be addressed. Often times, people don’t even realize they are becom-ing dangerously agitated until it is too late. The purpose of this study is to measure a drivers’ reaction to diverse stimuli in a simulated environment in order to examine how raising the awareness of the symptoms described might allow the driver to modify his/her behavior before engaging in disas-trous consequences. The stimuli used in testing for this study would include an array of graphics, videos and sounds. This study uses an Arduino board that connects to three bio-metric sensors which will track the users pulse, temperature and skin-conductivity. Whenever the human body is under mental stress, the parasympathetic activities of his/her heart decreases and the sympathetic activity increases (Rani, 2002). In other words, their pulse increases dramatically. Other signs of agitation include, but are not limited to: conductivity of skin increases and the tensing of muscles which causes the temperature of their extremities (fingers, hands and feet) to drop signifi-cantly. Upon IRB approval, this research will be conducted with fifty partici-pants. The data extracted from testing will be analyzed and finding’s report-ed

Life satisfaction among a clinical eating disorder population

Background The primary objective was to understand life satisfaction (LS) of patients with eating disorders (EDs) in relation to eating pathology severity, personal/familial ED history, and key demographic and anthropometric variables. Methods Participants (N = 60) completed the Satisfaction with Life Scale (SWLS), the Eating Pathology Severity Index (EPSI), and demographic questionnaires. Bivariate associations via correlations and multiple linear regression models were used to explore these relationships. Results The SWLS mean score was 3.7 out of 7, suggesting it is below the population-based norm. LS was positively statistically significantly associated with private insurance, past ED, EPSI muscle building, EPSI restricted eating, and EPSI negative attitudes. When included in multiple linear regression, the model explained 33% of the variability of LS [F (7, 56) = 3.4, p = 0.0054, R2 = 0.33]. EPSI muscle building remained the strongest predictor (β = 0.13, p = 0.04). Conclusions Based on the data, individuals who have/have had EDs scored lower on the SWLS than the general population. Individuals scoring within this range typically experience significant issues in several areas of life or a substantial issue in one area

Heuristic Modeling for TRMM Lifetime Predictions

Analysis time for computing the expected mission lifetimes of proposed frequently maneuvering, tightly altitude constrained, Earth orbiting spacecraft have been significantly reduced by means of a heuristic modeling method implemented in a commercial-off-the-shelf spreadsheet product (QuattroPro) running on a personal computer (PC). The method uses a look-up table to estimate the maneuver frequency per month as a function of the spacecraft ballistic coefficient and the solar flux index, then computes the associated fuel use by a simple engine model. Maneuver frequency data points are produced by means of a single 1-month run of traditional mission analysis software for each of the 12 to 25 data points required for the table. As the data point computations are required only a mission design start-up and on the occasion of significant mission redesigns, the dependence on time consuming traditional modeling methods is dramatically reduced. Results to date have agreed with traditional methods to within 1 to 1.5 percent. The spreadsheet approach is applicable to a wide variety of Earth orbiting spacecraft with tight altitude constraints. It will be particularly useful to such missions as the Tropical Rainfall Measurement Mission scheduled for launch in 1997, whose mission lifetime calculations are heavily dependent on frequently revised solar flux predictions

Geostationary Operational Environmental Satellite (GOES)-8 mission flight experience

The Geostationary Operational Environmental Satellite (GOES)-8 spacecraft was launched on April 13, 1994, at 06:04:02 coordinated universal time (UTC), with separation from the Atlas-Centaur launch vehicle occurring at 06:33:05 UTC. The launch was followed by a series of complex, intense operations to maneuver the spacecraft into its geosynchronous mission orbit. The Flight Dynamics Facility (FDF) of the Goddard Space Flight Center (GSFC) Flight Dynamics Division (FDD) was responsible for GOES-8 attitude, orbit maneuver, orbit determination, and station acquisition support during the ascent phase. This paper summarizes the efforts of the FDF support teams and highlights some of the unique challenges the launch team faced during critical GOES-8 mission support. FDF operations experience discussed includes: (1) The abort of apogee maneuver firing-1 (AMF-1), cancellation of AMF-3, and the subsequent replans of the maneuver profile; (2) The unexpectedly large temperature dependence of the digital integrating rate assembly (DIRA) and its effect on GOES-8 attitude targeting in support of perigee raising maneuvers; (3) The significant effect of attitude control thrusting on GOES-8 orbit determination solutions; (4) Adjustment of the trim tab to minimize torque due to solar radiation pressure; and (5) Postlaunch analysis performed to estimate the GOES-8 separation attitude. The paper also discusses some key FDF GOES-8 lessons learned to be considered for the GOES-J launch which is currently scheduled for May 19, 1995

Proceedings of the 2014 A.S.P.E.N. Research Workshop

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141886/1/jpen0167.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/141886/2/jpen0167-sup-0001.pd

Performance Analysis of Two Quantum Reaction Dynamics Codes: Time-Dependent and Time-Independent Strategies

The computer simulation of reaction dynamics has nowadays reached a remarkable degree of accuracy. Triatomic elementary reactions are rigorously studied with great detail on a straightforward basis using a considerable variety of Quantum Dynamics computational tools available to the scientific community. In our contribution we compare the performance of two quantum scattering codes in the computation of reaction cross sections of a triatomic benchmark reaction such as the gas phase reaction Ne + H2+ %12. NeH++ H. The computational codes are selected as representative of time-dependent (Real Wave Packet [ ]) and time-independent (ABC [ ]) methodologies. The main conclusion to be drawn from our study is that both strategies are, to a great extent, not competing but rather complementary. While time-dependent calculations advantages with respect to the energy range that can be covered in a single simulation, time-independent approaches offer much more detailed information from each single energy calculation. Further details such as the calculation of reactivity at very low collision energies or the computational effort related to account for the Coriolis couplings are analyzed in this paper