LLukas22/scidocs huggingface dataset:
Online Tools for Demonstration of Backtest Overfitting

In mathematical finance, backtest overfitting means the usage of historical market data (a backtest) to develop an investment strategy, where too many variations of the strategy are tried, relative to the amount of data available. Backtest overfitting is now thought to be a primary reason why quantitative investment models and strategies that look good on paper often disappoint in practice. In this document we introduce two online tools, the Backtest Overfitting Demonstration Tool, or BODT for short, and the Tenure Maker Simulation Tool, or TMST, which illustrate the impact of backtest overfitting on investment models and strategies. This report describes BODT and TSMT, and the experiments they perform, together with technical details such as the evaluation metrics and parameters used.
Experience Mining Google's Production Console Logs

We describe our early experience in applying our console log mining techniques [19, 20] to logs from production Google systems with thousands of nodes. This data set is five orders of magnitude in size and contains almost 20 times as many messages types as the Hadoop data set we used in [19]. It also has many properties that are unique to large scale production deployments (e.g., the system stays on for several months and multiple versions of the software can run concurrently). Our early experience shows that our techniques, including source code based log parsing, state and sequence based feature creation and problem detection, work well on this production data set. We also discuss our experience in using our log parser to assist the log sanitization.
Parental Involvement in Homework: A Review of Current Research and Its Implications for Teachers, After School Program Staff, and Parent Leaders.

The article reviews research on parental involvement in student homework. It is focused on understanding: why parents become involved in their children’s homework; which activities and strategies they employ in the course of involvement; how their homework involvement influences student outcomes; and which student outcomes are influenced by parents’ involvement. Findings suggest that parents involve themselves in student homework because they believe that they should be involved, believe that their involvement will make a positive difference, and perceive that their children or children’s teachers want their involvement. Parents’ involvement activities take many forms, from establishing structures for homework performance to teaching for understanding and developing student learning strategies. Operating largely through modeling, reinforcement, and instruction, parents’ homework involvement appears to influence student success insofar as it supports student attributes related to achievement (e.g., attitudes about homework, perceptions of personal competence, self-regulatory skills). Recommendations for research focused on the processes and outcomes of parents’ homework involvement are offered, as are suggestions for school practices to enhance the effectiveness of parental involvement in homework.
A Promoted Design for Primary Coil in Roadway-Powered System

As technology advances, electric vehicle (EV) dynamic charging utilizing wireless power transfer (WPT) becomes prevalent. This new power supply mode allows running cars to be charged with electricity at any time on the road. Unlike traditional tramcars, the EVs can be free from rail limitation, and WPT technology provides maximal charging flexibility. This paper studies a WPT charging system, which uses a series of sectional primary coils. The relationship between primary coil size and transfer efficiency is fully explored. On the basis of sectional wireless power supply, the lateral movement of transfer coils is reported, and a promoted design for the primary coil that provides power for a two-lane road simultaneously is proposed.
Evolution of porous structure and free-volume entities in magnesium aluminate spinel ceramics

Abstract Porous structure evolution in functional humidity-sensitive MgAl 2 O 4 spinel ceramics prepared at different sintering temperatures is studied. It is shown that the increase in sintering temperature from 1100 to 1400 °C results in the transformation of the pore size distribution in ceramics. It is established that porous ceramics with tri-modal pore size distribution including open macro-, meso- and micropores up to a few nanometer is humidity sensitive in the 25–95% relative humidity range. It is demonstrated that positron annihilation lifetime spectroscopy supported by four-component fitting procedure is a promising tool for nanostructural characterization of MgAl 2 O 4 spinel-type ceramics. Microstructure of these materials is improved with the increase in sintering temperature; the effect mainly results in the decrease of the additional near grain boundaries phases amount. These phase extractions and free-volume entities in ceramic structure serve as specific trapping centers for positrons penetrating ceramics. It is demonstrated that Tao–Eldrup model can be adequately used for the calculation nanopores size in MgAl 2 O 4 ceramics using o-Ps lifetimes of the third and the fourth components.
Spatial and temporal correlation of water quality parameters of produced waters from devonian-age shale following hydraulic fracturing.

The exponential increase in fossil energy production from Devonian-age shale in the Northeastern United States has highlighted the management challenges for produced waters from hydraulically fractured wells. Confounding these challenges is a scant availability of critical water quality parameters for this wastewater. Chemical analyses of 160 flowback and produced water samples collected from hydraulically fractured Marcellus Shale gas wells in Pennsylvania were correlated with spatial and temporal information to reveal underlying trends. Chloride was used as a reference for the comparison as its concentration varies with time of contact with the shale. Most major cations (i.e., Ca, Mg, Sr) were well-correlated with chloride concentration while barium exhibited strong influence of geographic location (i.e., higher levels in the northeast than in southwest). Comparisons against brines from adjacent formations provide insight into the origin of salinity in produced waters from Marcellus Shale. Major cations exhibited variations that cannot be explained by simple dilution of existing formation brine with the fracturing fluid, especially during the early flowback water production when the composition of the fracturing fluid and solid-liquid interactions influence the quality of the produced water. Water quality analysis in this study may help guide water management strategies for development of unconventional gas resources.
The optical properties of PbTe films in the 5–20 μm wavelength region

Abstract PbTe films have been prepared by a variety of evaporation techniques using a range of substrate temperatures and source compositions. It has proved possible to prepare films exhibiting low absorption (> 25 cm −1 ) over a wide spectral range (6–20 μm) combined with a high refractive index, 5.6, with very little dispersion. The techniques used flash evaporation of tellurium rich PbTe onto unheated substrates. Although X-ray studies and Hall measurements have been performed on these samples and reveal intriguing variations, only limited correlation is possible with the detailed variation of the optical properties. A very simplified explanation is offered by the results of thermal probe measurements which indicate that the transparent films are those with very few electrical carriers present.
A New Framework for Privacy of RFID Path Authentication

RFID-based path authentication enables supply chain managers to verify the exact path that a tag has taken. In this paper, we introduce a new oracle Move that models a tag’s movement along a designed or an arbitrary path in a supply chain. With this oracle, we refine the existing security and privacy notions for RFID-based path authentication. In addition, we propose a new privacy notion, called path privacy, for RFID-based path authentication. Our privacy notion captures the privacy of both tag identity and path information in a single game. Compared to existing two-game based privacy notions, it is more rigorous, powerful, and concise. We also construct a new path authentication scheme. Our scheme does not require the entities in a supply chain to have any connection with each other except in the initial stage. It requires only 480 bits storage and no computational ability on each tag; thus it can be deployed on the standard EPCglobal Class 1 Generation 2 tags in the market.
Late initiation of HAART among HIV-infected patients in Spain is frequent and related to a higher rate of virological failure but not to immigrant status.

PURPOSE
To determine whether immigrant status is associated with late initiation of highly active antiretroviral treatment (HAART) and/or poor response to antiretrovirals.


METHODS
GESIDA 5808 is a multicenter, retrospective cohort study (inclusion period January 2005 through December 2006) of treatment-naïve patients initiating HAART that compares HIV-infected patients who are immigrants with Spanish-born patients. A late starter (LS) was defined as any patient starting HAART with a CD4+ lymphocyte count <200 cells/μL and/or diagnosis of an AIDS-defining illness before or at the start of therapy. The primary endpoint was time to treatment failure (TTF), defined as virological failure (VF), death, opportunistic infection, treatment discontinuation/switch (D/S), or missing patient. Secondary endpoints were time to treatment failure as observed data (TTO; censoring missing patients) and time to virological failure (TVF; censoring missing patients and D/S not due to VF).


RESULTS
LS accounted for 56% of the patients. Lower educational and socioeconomic level and intravenous drug use (IVDU) were associated with categorization as LS, but immigrant status was not. Cox regression analysis (hazard ratio [HR]; 95% CI) between LS and non-LS patients showed no differences in TTF (0.97; 0.78-1.20) or TTO (1.18; 0.88-1.58), although it did reveal a difference in TVF (1.97; 1.18-3.29). CD4+ lymphocyte recovery was equivalent for both LS and non-LS patients (159 vs 173).


CONCLUSIONS
In our cohort, immigrant status was not shown to be related to late initiation of HAART. Although LS patients did not have a longer TTF for any reason, TVF was significantly shorter. Despite universal free access to HAART in Spain, measures to ensure early diagnosis and treatment of HIV infection are necessary.
Digital disease detection--harnessing the Web for public health surveillance.

n engl j med 360;21 nejm.org may 21, 2009 2153 online announcements by government agencies but also through informal channels, ranging from press reports to blogs to chat rooms to analyses of Web searches (see box). Collectively, these sources provide a view of global health that is fundamentally different from that yielded by the disease reporting of the traditional public health infrastructure.1 Over the past 15 years, Internet technology has become integral to public health surveillance. Systems using informal electronic information have been credited with reducing the time to recognition of an outbreak, preventing governments from suppressing outbreak information, and facilitating public health responses to outbreaks and emerging diseases. Because Web-based sources frequently contain data not captured through traditional government communication channels, they are useful to public health agencies, including the Global Outbreak Alert and Response Network of the World Health Organization (WHO), which relies on such sources for daily surveillance activities. Early efforts in this area were made by the International Society for Infectious Diseases’ Program for Monitoring Emerging Diseases, or ProMED-mail, which was founded in 1994 and has grown into a large, publicly available reporting system, with more than 45,000 subscribers in 188 countries.2 ProMED uses the Internet to disseminate information on outbreaks by e-mailing and posting case reports, including many gleaned from readers, along with expert commentary. In 1997, the Public Health Agency of Canada, in collaboration with the WHO, created the Global Public Health Intelligence Network (GPHIN), whose software retrieves relevant articles from news aggregators every 15 minutes, using extensive search queries. ProMED and GPHIN played critical roles in informing public health officials of the outbreak of SARS, or severe acute respiratory syndrome, in Guangdong, China, as early as November 2002, by identifying informal reports on the Web through news media and chat-room discussions. More recently, the advent of openly available news aggregators and visualization tools has spawned a new generation of disDigital Disease Detection — Harnessing the Web for Public Health Surveillance
The Automatic Creation of Literature Abstracts

Excerpts of technical papers and magazine articles that serve the purposes of conventional abstracts have been created entirely by automatic means. In the exploratory research described, the complete text of an article in machine-readable form i s scanned by a n IBM 704 data-processing machine and analyzed in accordance with a standard program. Statistical information derived from word frequency and distribution is used by the machine to compute a relative measure of significance, first for individual words and then for sentences. Sentences scoring highest in significance are extracted and printed out to become the " auto-abstract. " Introduction
Gender differences in adolescents' perceptions of the best and worst aspects of computing at school

This study examined gender differences in perceptions of school computing by asking girls and boys at early and late stages in secondary education what they liked best and least about using computers at school. Overall age differences were very marked and reflected the different skill levels of the pupils and the increase in the sophistication of their computer use at the later stage of the curriculum. Gender differences were found in both age groups. These included a greater work orientation and liking for e-mail apparent in girls’ responses. Boys showed a greater affinity with computer games and mentioned limitations upon their access to machines more. These gender differences are a further demonstration that girls approach computers as tools for accomplishing tasks, while boys approach them as technology for play and mastery. Such differences are important for understanding how computers are approached in educational settings. # 2003 Elsevier Ltd. All rights reserved.
Food Allergen Labeling and Purchasing Habits in the United States and Canada.

BACKGROUND
Mandatory labeling of products with top allergens has improved food safety for consumers. Precautionary allergen labeling (PAL), such as "may contain" or "manufactured on shared equipment," are voluntarily placed by the food industry.


OBJECTIVE
To establish knowledge of PAL and its impact on purchasing habits by food-allergic consumers in North America.


METHODS
Food Allergy Research & Education and Food Allergy Canada surveyed consumers in the United States and Canada on purchasing habits of food products featuring different types of PAL. Associations between respondents' purchasing behaviors and individual characteristics were estimated using multiple logistic regression.


RESULTS
Of 6684 participants, 84.3% (n = 5634) were caregivers of a food-allergic child and 22.4% had food allergy themselves. Seventy-one percent reported a history of experiencing a severe allergic reaction. Buying practices varied on the basis of PAL wording; 11% of respondents purchased food with "may contain" labeling, whereas 40% purchased food that used "manufactured in a facility that also processes." Twenty-nine percent of respondents were unaware that the law requires labeling of priority food allergens. Forty-six percent were either unsure or incorrectly believed that PAL is required by law. Thirty-seven percent of respondents thought PAL was based on the amount of allergen present. History of a severe allergic reaction decreased the odds of purchasing foods with PAL.


CONCLUSIONS
Almost half of consumers falsely believed that PAL was required by law. Up to 40% surveyed consumers purchased products with PAL. Understanding of PAL is poor, and improved awareness and guidelines are needed to help food-allergic consumers purchase food safely.
Olanzapine in the treatment of hallucinosis in idiopathic Parkinson's disease: a cautionary note.

BACKGROUND
Hallucinosis is a dopaminergic dose limiting complication of the treatment of idiopathic Parkinson's disease. Typical neuroleptic medications cannot be used for suppressing hallucinosis because the extrapyramidal side effects worsen parkinsonian motor control. Olanzapine is a novel atypical antipsychotic drug with few reported extrapyramidal side effects which may be more suitable for controlling hallucinosis in these patients.


METHODS
Olanzapine was given to five patients with idiopathic Parkinson's disease and the dosage was titrated until a clinically meaningful reduction in hallucinosis was achieved. The commercially available 5 mg, 7.5 mg and 10 mg tablets were used.


RESULTS
After an initial 9 days of treatment, hallucinosis frequency was significantly reduced, an effect which was maintained with continued treatment. However, during this early phase of treatment, parkinsonian motor disability increased, which resulted in two of the patients discontinuing medication.


CONCLUSIONS
Olanzapine is effective in the suppression of hallucinosis in patients with idiopathic Parkinson's disease but the currently available dose increments may result in an unacceptable exacerbation of motor disability.
Longitudinal effects of media violence on aggression and empathy among German adolescents

a r t i c l e i n f o To address the longitudinal relation between adolescents' habitual usage of media violence and aggressive behavior and empathy, N = 1237 seventh and eighth grade high school students in Germany completed measures of violent and nonviolent media usage, aggression, and empathy twice in twelve months. Cross-lagged panel analyses showed significant pathways from T1 media violence usage to higher physical aggression and lower empathy at T2. The reverse paths from T1 aggression or empathy to T2 media violence usage were nonsignificant. The links were similar for boys and girls. No links were found between exposure to nonviolent media and aggression or between violent media and relational aggression. T1 physical aggression moderated the impact of media violence usage, with stronger effects of media violence usage among the low aggression group. Introduction Despite the rapidly growing body of research addressing the potentially harmful effects of exposure to violent media, the evidence currently available is still limited in several ways. First, there is a shortage of longitudinal research examining the associations of media violence usage and aggression over time. Such evidence is crucial for examining hypotheses about the causal directions of observed co-variations of media violence usage and aggression that cannot be established on the basis of cross-sectional research. Second, most of the available longitudinal evidence has focused on aggression as the critical outcome variable, giving comparatively little attention to other potentially harmful effects, such as a decrease in empathy with others in distress. Third, the vast majority of studies available to date were conducted in North America. However, even in the age of globalization, patterns of media violence usage and their cultural contexts may vary considerably, calling for a wider database from different countries to examine the generalizability of results to address each of these aspects. It presents findings from a longitudinal study with a large sample of early adolescents in Germany, relating habitual usage of violence in movies, TV series, and interactive video games to self-reports of physical aggression and empathy over a period of twelve months. The study focused on early adolescence as a developmental period characterized by a confluence of risk factors as a result of biological, psychological, and social changes for a range of adverse outcomes. Regular media violence usage may significantly contribute to the overall risk of aggression as one such negative outcome. Media consumption increases from childhood …
Dense 3D Regression for Hand Pose Estimation

We present a simple and effective method for 3D hand pose estimation from a single depth frame. As opposed to previous state-of-the-art methods based on holistic 3D regression, our method works on dense pixel-wise estimation. This is achieved by careful design choices in pose parameterization, which leverages both 2D and 3D properties of depth map. Specifically, we decompose the pose parameters into a set of per-pixel estimations, i.e., 2D heat maps, 3D heat maps and unit 3D directional vector fields. The 2D/3D joint heat maps and 3D joint offsets are estimated via multitask network cascades, which is trained end-to-end. The pixel-wise estimations can be directly translated into a vote casting scheme. A variant of mean shift is then used to aggregate local votes while enforcing consensus between the the estimated 3D pose and the pixel-wise 2D and 3D estimations by design. Our method is efficient and highly accurate. On MSRA and NYU hand dataset, our method outperforms all previous state-of-the-art approaches by a large margin. On the ICVL hand dataset, our method achieves similar accuracy compared to the nearly saturated result obtained by [5] and outperforms various other proposed methods. Code is available online1.
A randomized, controlled study of autologous therapy with bone marrow-derived aldehyde dehydrogenase bright cells in patients with critical limb ischemia.

OBJECTIVES
The safety and efficacy of direct intramuscular injections of aldehyde dehydrogenase bright (ALDH(br)) cells isolated from autologous bone marrow mononuclear cells (ABMMNCs) and ABMMNCs were studied in patients with critical limb ischemia (CLI) who were not eligible for percutaneous or surgical revascularization.


BACKGROUND
Many CLI patients are not candidates for current revascularization procedures, and amputation rates are high in these patients. Cell therapy may be a viable option for CLI patients.


METHODS
Safety was the primary objective and was evaluated by occurrence of adverse events. Efficacy, the secondary objective, was evaluated by assessment of Rutherford category, ankle-brachial index (ABI), transcutaneous partial pressure of oxygen (TcPO(2)), quality of life, and pain.


RESULTS
ALDH(br) cells and ABMMNCs were successfully administered to all patients. No therapy-related serious adverse events occurred. Patients treated with ALDH(br) cells (n = 11) showed significant improvements in Rutherford category from baseline to 12 weeks (mean, 4.09 ± 0.30 to 3.46 ± 1.04; P = 0.05) and in ABI at 6 (mean, 0.22 ± 0.19 to 0.30 ± 0.24; P = 0.02), and 12 weeks (mean, 0.36 ± 0.18; P = 0.03) compared with baseline. Patients in the ABMMNC group (n = 10) showed no significant improvements at 6 or 12 weeks in Rutherford category but did show improvement in ABI from baseline to 12 weeks (0.38 ± 0.06 to 0.52 ± 0.16; P = 0.03). No significant changes from baseline were noted in ischemic ulcer grade or TcPO(2) in either group.


CONCLUSIONS
Administration of autologous ALDH(br) cells appears to be safe and warrants further study in patients with CLI.