Miracle-dz/UniFAR-FTUs huggingface dataset:
Uso problemático de internet en estudiantes universitarios : factores asociados y diferencias de género

El objetivo del presente trabajo es realizar un analisis descriptivo del uso problematico de Internet en estudiantes universitarios, evaluando la posible asociacion con problemas de salud y conductas adictivas, asi como diferencias de genero en los tipos utilizacion. Un total de 2780 alumnos participaron en el estudio entre los anos 2011 – 2014, siendo un 29% varones (edad 20.8 ± 5.1 anos) y un 71% mujeres (edad de 20.3 ± 4.4 anos). La prevalencia de uso problematico de Internet evaluada mediante el Internet Addiction Test fue del 6.08%. Ser menor de 21 anos y cursar titulaciones diferentes a ciencias de la salud fueron factores asociados a una mayor frecuencia de este problema, no existiendo diferencias en funcion del sexo o tipo de domicilio. Los resultados muestran una asociacion significativa con algunos problemas de salud (migranas, dolor lumbar, sobrepeso u obesidad, descanso insuficiente), aspectos psicologicos (riesgo de trastornos de la conducta alimentaria, riesgo de trastorno mental, depresion), problemas familiares y discriminacion; no encontrandose asociaciones con consumo de sustancias adictivas (alcohol, tabaco o cannabis). Respecto al tiempo de uso de Internet, las horas de conexion semanales fueron significativamente mayores en las mujeres que en los hombres, tanto en el tiempo total como por motivos de ocio. El analisis del perfil de utilizacion en usuarios problematicos revelo que los varones se relacionan mas con aspectos de ocio como los juegos o las compras online y las mujeres con aspectos de socializacion, como el chat o las redes sociales.
Charting an arid landscape: the preparation of novice primary principals in Western Australia

This paper examines the complex matter of initial principal preparation in a context where traditionally beginning principals have learned their role from experience, on the job. Using data from both novice and experienced primary principals it was found that while what was needed in the job was agreed upon – how to deal with place, with people, with the system and with the sense of self – there was little understanding of what would constitute an appropriate or suitable way of learning the skills or mastering the knowledge to be able to meet these challenges as effectively as possible.
The first T cell response to transmitted/founder virus contributes to the control of acute viremia in HIV-1 infection

Identification of the transmitted/founder virus makes possible, for the first time, a genome-wide analysis of host immune responses against the infecting HIV-1 proteome. A complete dissection was made of the primary HIV-1–specific T cell response induced in three acutely infected patients. Cellular assays, together with new algorithms which identify sites of positive selection in the virus genome, showed that primary HIV-1–specific T cells rapidly select escape mutations concurrent with falling virus load in acute infection. Kinetic analysis and mathematical modeling of virus immune escape showed that the contribution of CD8 T cell–mediated killing of productively infected cells was earlier and much greater than previously recognized and that it contributed to the initial decline of plasma virus in acute infection. After virus escape, these first T cell responses often rapidly waned, leaving or being succeeded by T cell responses to epitopes which escaped more slowly or were invariant. These latter responses are likely to be important in maintaining the already established virus set point. In addition to mutations selected by T cells, there were other selected regions that accrued mutations more gradually but were not associated with a T cell response. These included clusters of mutations in envelope that were targeted by NAbs, a few isolated sites that reverted to the consensus sequence, and bystander mutations in linkage with T cell–driven escape.
Asynchronous Parallel Reliefboard Computation for Scene Object Approximation

We present a parallel algorithm for the rendering of complex three-dimensional scenes. The algorithm runs across heterogeneous architectures of PC-clusters consisting of a visualization-node, equipped with a powerful graphics adapter, and cluster nodes requiring weaker graphics capabilities only. The visualization-node renders a mixture of scene objects and simplified meshes (Reliefboards). The cluster nodes assist the visualization-node by asynchronous computing of Reliefboards, which are used to replace and render distant parts of the scene. Our algorithm is capable of gaining significant speedups if the cluster's nodes provide weak graphics adapters only. We trade the number of cluster nodes off the scene objects' image quality.
A 50-GHz Phase-Locked Loop in 130-nm CMOS

A 50-GHz charge pump phase locked loop (PLL) utilizing an LC-oscillator based injection locked divider is fabricated in a 130-nm logic CMOS process. The PLL can be locked from 45.9 to 50.5 GHz and output power level is around -10 dBm. The circuit including buffers consumes 57 mW from 1.5/0.8 V supplies. The phase noise at 50 kHz, 1 MHz and 10 MHz offset from the carrier is -63.5, -72, and -99 dBc/Hz, respectively. The PLL also outputs -22-dBm second order harmonic frequencies between 91.8 and 101 GHz
Title Resistive Switching Behavior of Partially Anodized AluminumThin Film at Elevated Temperatures

Resistive switching behavior of partially anodized aluminum thin film has been investigated at temperatures of 25 ◦C–250 ◦C. Both the reset and set voltages decrease with increasing temperature, showing Arrhenius-like dependence with small activation energies. The pulse voltage experiment also suggests that the conductive filament breaking/reconnection is easier to occur at a higher temperature. Some possible mechanisms for the phenomena are discussed. On the other hand, at elevated temperatures without continuous electric field applied, while the high-resistance state exhibits no significant change with time, the low-resistance state (LRS) shows a continuous degradation, and there is a sudden failure. The LRS failure time shows Arrhenius dependence with an activation energy of ∼1.3 eV, suggesting that the LRS failure could be due to the migration of the excess Al atoms at high temperatures.
Effects of Dynamic Luminance Modulation on Visually Induced Self-Motion Perception: Observers' Perception of Illumination is Important in Perceiving Self-Motion

Coherent luminance modulation of visual objects affects visually induced perception of self-motion (vection). The perceptual mechanism underlying the effects of dynamic luminance modulation were investigated with a visual stimulus simulating an external environment illuminated by a moving spotlight (the normal spotlight condition) or an inverted luminance version of it (the inverted luminance condition). Two psychophysical experiments indicated that vection was generally weakened in the inverted luminance condition. The results cannot be fully explained by the undesirable differences of luminosity within the experimental environment, and suggest that the contrast polarity of the visual stimulus has a significant impact on vection. Furthermore, the results show that the dynamic luminance variations weaken vection in the normal spotlight condition in which the observers perceived illumination modulations. In contrast, in the inverted luminance condition, in which the observers cannot perceive the illumination manipulation, the dynamic luminance variations may not impair vection, and may even be expected to strengthen vection, even though they shared similar global and systematic luminance variation with the normal spotlight condition. These experiments suggest that the observer's perception of illumination is a key factor in considering the effects of dynamic luminance modulation of the visual stimulus.
Plasma Natriuretic Peptides and Incidence of Subtypes of Ischemic Stroke

Background and Purpose: Natriuretic peptides predict poor outcomes in cardiovascular disease. However, the knowledge of their relationship to stroke is limited and prospective studies from the general population are few. The purpose of this study was to explore the relationship between N-terminal pro-brain natriuretic peptide (NT-proBNP) and midregional pro-atrial natriuretic peptide (MR-proANP) plasma levels and the risk for ischemic stroke and its subtypes. Methods: NT-proBNP and MR-proANP were measured in fasting blood samples from 4,862 subjects (40.2% men, mean age 57.5 ± 6.0 years) without cardiovascular disease from the Malmö Diet and Cancer Study, a prospective, population-based study in Sweden. Incidence of ischemic stroke was monitored over a mean follow-up of 14.9 ± 3.0 years. Stroke cases were etiologically classified according to the TOAST classification. Cox proportional-hazards regression was used to study the incidence of stroke in relationship to NT-proBNP and MR-proANP. Results: During follow-up, 227 had a first-ever ischemic stroke (large-artery atherosclerosis, n = 35; cardioembolic stroke, n = 44; small-artery occlusion, n = 80; undetermined cause, n = 68). In the age- and sex-adjusted model, only NT-proBNP was associated with total ischemic stroke. This association was completely explained by an increased incidence of cardioembolic stroke. Adjusted for cardiovascular risk factors (age, sex, hypertension, diabetes, smoking, body mass index and low-density lipoprotein cholesterol), the hazard ratios (HRs, 95% confidence interval, 95% CI) for cardioembolic stroke were 1.00 (reference), 1.42 (0.34-6.00), 2.79 (0.77-10.12) and 5.64 (1.66-19.20), respectively, for the 1st, 2nd, 3rd and 4th quartiles of NT-proBNP. The corresponding HRs (95% CIs) for quartiles of MR-proANP were 1.00 (reference), 1.83 (0.55-6.14), 1.20 (0.33-4.34) and 3.96 (1.31-11.99), respectively. In total, 335 (6.9%) subjects were diagnosed with atrial fibrillation during follow-up. Among the cardioembolic stroke cases, 30% were diagnosed with atrial fibrillation before the stroke event and another 36% within 6 months after the stroke. Of the cardioembolic stroke cases with atrial fibrillation, 59% were in the top quartile of NT-proBNP, 69% in the top quartile of MR-proANP and 79% were either in the top quartile of NT-proBNP or in the top quartile of MR-proANP. Conclusion: High plasma levels of NT-proBNP and MR-proANP are associated with a substantially increased risk of cardioembolic stroke, but not with other subtypes of ischemic stroke. The results suggest that assessment of stroke risk, including electrocardiography, is warranted in subjects with high NT-proBNP or MR-proANP.
Regulation of mtrF Expression in Neisseria gonorrhoeae and Its Role in High-Level Antimicrobial Resistance

ABSTRACT The obligate human pathogen Neisseria gonorrhoeae uses the MtrC-MtrD-MtrE efflux pump to resist structurally diverse hydrophobic antimicrobial agents (HAs), some of which bathe mucosal surfaces that become infected during transmission of gonococci. Constitutive high-level HA resistance occurs by the loss of a repressor (MtrR) that negatively controls transcription of the mtrCDE operon. This high-level HA resistance also requires the product of the mtrF gene, which is located downstream and transcriptionally divergent from mtrCDE. MtrF is a putative inner membrane protein, but its role in HA resistance mediated by the MtrC-MtrD-MtrE efflux pump remains to be determined. High-level HA resistance can also be mediated through an induction process that requires enhanced transcription of mtrCDE when gonococci are grown in the presence of a sublethal concentration of Triton X-100. We now report that inactivation of mtrF results in a significant reduction in the induction of HA resistance and that the expression of mtrF is enhanced when gonococci are grown under inducing conditions. However, no effect was observed on the induction of mtrCDE expression in an MtrF-negative strain. The expression of mtrF was repressed by MtrR, the major repressor of mtrCDE expression. In addition to MtrR, another repressor (MpeR) can downregulate the expression of mtrF. Repression of mtrF by MtrR and MpeR was additive, demonstrating that the repressive effects mediated by these regulators are independent processes.
Design and Performance Evaluation of Resource-Management Framework for End-to-End Adaptation of Distributed Real-time Embedded Systems

Standards-based quality of service (QoS)-enabled component middleware is increasingly being used as a platform for developing distributed real-time embedded (DRE) systems. Although QoS-enabled component middleware offers many desirable features, until recently it lacked the ability to monitor utilization of system resources, efficiently allocate resources to application components, and ensure application QoS requirements are met. Moreover, it has also lacked the ability to handle fluctuations in availability of resource resources and application workload. This paper presents two contributions to research on adaptive resource management for component-based DRE systems. First, we describe the structure and functionality of the Resource Allocation and Control Engine (RACE), which is an opensource adaptive resource management framework built atop standards-based QoS-enabled component middleware. Second, we demonstrate and evaluate the effectiveness of RACE in the context of a representative DRE system: NASA’s Magnetospheric Multi-scale Mission system. Our empirical results demonstrate that when adaptive resource management algorithms for DRE systems are implemented using RACE, they yield in a predictable and high performance system, even in the face of changing operational conditions, workloads, and resource availability.
Unusual Problems in Airway Management II. The Influence of the Temporomandibular Joint, the Mandible, and Associated Structures on Endotracheal lntubation

In a previous paper1 we (V.L.B.) discussed the importance of the articulations of the cervical spine and the atlanto-occipital joint. In the present paper, we wish to discuss anatomic and pathologic factors relating to the temporomandibular joint, the mandible, and associated structures. That such information needs presentation is attested by the fact that one textbook dedicated to anatomy for anesthesiology does not even mention these structures.2 Anomalies that arise in these areas, however, may preclude successful intubation, whereas the knowledge of these anomalies may forewarn the anesthesiologist of necessary precautions or modifications for the proper placement of the endotracheal tube.
Locked Plating of the Proximal Humerus Using an Endosteal Implant

Purpose: To report on the use of a supplemental medial endosteal implant to prevent varus collapse and screw cutout in proximal humerus fractures treated with a laterally placed locking plate. Methods: Twenty-seven patients meeting study inclusion criteria were included in the study. Follow-up averaged 63.1 weeks (minimum 37 weeks and maximum 120 weeks). All patients were either older than 70 years or had sustained a proximal humerus fracture with medial comminution. Using the anterolateral acromial approach, a proximal humeral locking plate augmented with a medial endosteal implant (fibular allograft in 23 patients and semitubular plate in 4 patients) was used for fixation. Intraoperative fluoroscopic images and the most recent follow-up radiographs were used to measure the head–shaft angle and loss of height between the implant and the articular surface. Results: Only 1 of 27 patients had significant loss of reduction with collapse of the fracture into varus (4.2 mm change). Ninety-six percent of patients maintained their original reduction with an average loss of height of 1.2 mm and an average change in shaft–head angle of 2.2 degrees. There were no implant failures or screw perforations of the articular surface and no radiographic or clinical evidence of AVN. Conclusions: Use of a medial endosteal implant as a supplement to a lateral locking plate is effective in maintaining operative reduction, preventing varus collapse, and implant failure in fractures with medial comminution and/or poor bone quality. Level of Evidence: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.
Multidomain Structure and Cellulosomal Localization of the Clostridium thermocellum Cellobiohydrolase CbhA

ABSTRACT The nucleotide sequence of the Clostridium thermocellumF7 cbhA gene, coding for the cellobiohydrolase CbhA, has been determined. An open reading frame encoding a protein of 1,230 amino acids was identified. Removal of a putative signal peptide yields a mature protein of 1,203 amino acids with a molecular weight of 135,139. Sequence analysis of CbhA reveals a multidomain structure of unusual complexity consisting of an N-terminal cellulose binding domain (CBD) homologous to CBD family IV, an immunoglobulin-like β-barrel domain, a catalytic domain homologous to cellulase family E1, a duplicated domain similar to fibronectin type III (Fn3) modules, a CBD homologous to family III, a highly acidic linker region, and a C-terminal dockerin domain. The cellulosomal localization of CbhA was confirmed by Western blot analysis employing polyclonal antibodies raised against a truncated enzymatically active version of CbhA. CbhA was identified as cellulosomal subunit S3 by partial amino acid sequence analysis. Comparison of the multidomain structures indicates striking similarities between CbhA and a group of cellulases from actinomycetes. Average linkage cluster analysis suggests a coevolution of the N-terminal CBD and the catalytic domain and its spread by horizontal gene transfer among gram-positive cellulolytic bacteria.
Basic Definitions 2 . 1 Predictability , Min-Entropy , Statistical Distance , Extraction

This survey presents a general approach for handling secret biometric data in cryptographic applications. The generality manifests itself in two ways: we attempt to minimize the assumptions we make about the data, and to present techniques that are broadly applicable wherever biometric inputs are used. Because biometric data comes from a variety of sources that are mostly outside of anyone’s control, it is prudent to assume as little as possible about how they are distributed; in particular, an adversary may know more about a distribution than a system’s designers and users. Of course, one may attempt to measure some properties of a biometric distribution, but relying on such measurements in the security analysis is dangerous, because the adversary may have even more accurate measurements available to it. For instance, even assuming that some property of a biometric behaves according to a binomial distribution (or some similar discretization of the normal distribution), one could determine the mean of this distribution only to within ≈ 1 √ n after taking n samples; a well-motivated adversary can take more measurements, and thus determine the mean more accurately. Rather than assuming that some statistical information about the biometric input is available, we assume only that the input is unpredictable: i.e., that if an adversary is allowed a single guess at the value of the input, the likelihood that it is correct is 2−m for some m. This is a minimal assumption in the applications we consider: indeed, if the input is easily guessed, then one cannot use it to derive, say, a secret key for encryption or remote authentication. Of course, determining the exact value of m may in itself present a challenge; however, some lower bound on m is necessary for any sort of security claims. Similarly, while some understanding of errors in biometric measurements is possible, we prefer to minimize the assumptions we make about such errors. We assume only that a subsequent measurement is within a given, allowed distance of the measurement taken at enrollment. The broad applicability of the approaches presented here stems from the initial observation that many prior solutions for specific security problems based on noisy data (including biometrics)
An experimental evaluation of the Pastis peer-to-peer file system under churn

Ce papier presente une evaluation exprimentale du systeme de fichiers Pastis dans un reseau pair-a-pair dynamique. Nous evaluons le comportement de Pastis afin de determiner sa capacite a s'adapter aux changements du reseau. Nous utilisons une version modifiee de la DHT PAST afin d'ameliorer la gestion des donnees modifiables et la tolerance la volatilite du reseaux, c'est-a-dire, aux connexions et deconnexions des noeuds. Notre protocole de replication distingue entre les blocs modifiables et immutables, ce qui diminue la probabilite de perte de donnees. Enfin, un protocole a base de quorums permet d'assurer la coherence des donnees modifiables en presence de noeuds fautifs. Nos experimentations utilisent Modelnet pour emuler les latences d'un reseau large echelle ainsi que la bande passante asyemtrique des clients connectes par des liens ADSL. Les resultats montrent que Pastis permet de conserver la coherence des donnees meme des taux de volatilitles.
Studies on the autonomic nervous function in Tsukuba emotional rats--with special reference to their cardiac function.

Autonomic nervous function in Tsukuba high (THE) and low (TLE) emotional rats as well as Wistar rats (control) was studied by means of electrocardiographical examination in addition to the runway test. In the runway test, locomotive activity differed significantly among the three strains, the greatest activity in TLE and the smallest in THE. Electrocardiogram (ECG) and locomotive activity were successively recorded for 24 hr using a small size of telemeter system. Though the locomotive activity showed a clear nocturnal rhythm, no significant difference was observed among the three strains. The mean value of R-R intervals in THE tended to be smaller than those in other two strains; showing a significant difference between THE and TLE. The mean value of standard deviation (SD) of R-R intervals in TLE tended to be larger than those in other two strains; showing a significant difference between TLE and Wistar in the light and dark periods, and also between TLE and THE in the light period. As regards coefficients of variation of R-R intervals (CV), there was no significant difference among the three strains. Autonomic nervous tone in THE and TLE was evaluated by means of autonomic blockades using atropine and/or propranolol. The sympathetic nervous tone represented 21.6% in THE and 16.8% in TLE, while the parasympathetic nervous tone -9.0% and -12.3% in THE and TLE, respectively. There was a significant difference in the net autonomic nervous tone between THE (10.7%) and TLE (-6.6%). (ABSTRACT TRUNCATED AT 250 WORDS)