A Factorization Algorithm for G-Algebras and Applications

It has been recently discovered by Bell, Heinle and Levandovskyy that a large class of algebras, including the ubiquitous $G$-algebras, are finite factorization domains (FFD for short). Utilizing this result, we contribute an algorithm to find all distinct factorizations of a given element $f \in \mathcal{G}$, where $\mathcal{G}$ is any $G$-algebra, with minor assumptions on the underlying field. Moreover, the property of being an FFD, in combination with the factorization algorithm, enables us to propose an analogous description of the factorized Gr\"obner basis algorithm for $G$-algebras. This algorithm is useful for various applications, e.g. in analysis of solution spaces of systems of linear partial functional equations with polynomial coefficients, coming from $\mathcal{G}$. Additionally, it is possible to include inequality constraints for ideals in the input

Lebensqualität und alexithyme Merkmale bei Patienten mit somatoformer Schmerzstörung

Zusammenfassung: Hintergrund: Patienten mit einer somatoformen Schmerzstörung weisen häufig eine schlechte gesundheitsbezogene Lebensqualität (QoL) und Schwierigkeiten in der Affektregulation (Alexithymie) auf. Ziel dieser Studie war es, den Zusammenhang zwischen QoL und alexithymen Merkmalen zu untersuchen. Patienten und Methoden: Bei 51Patienten mit somatoformer Schmerzstörung (durchschnittliche Erkrankungsdauer: 11,6Jahre) wurden Alexithymie (TAS-20), QoL (WHOQOL-BREF), psychische Belastung und Somatisierung (SCL-90-R) und depressive Symptome (MADRS) erhoben. Ergebnisse: Es fand sich eine signifikante negative Korrelation zwischen QoL und alexithymen Persönlichkeitsmerkmalen, insbesondere der psychischen QoL und dem TAS-20-Gesamtwert (r=−0,63, p<0,001). Die Alexithymiesubskala "Schwierigkeiten, Gefühle zu beschreiben" erwies sich als signifikanter Einflussfaktor für die psychische QoL (β=−0,34, p<0,01), auch nach Kontrolle von Depression, Somatisierung und Geschlecht. Schlussfolgerung: Für die insgesamt sehr niedrige QoL von Patienten mit somatoformer Schmerzstörung scheinen auch alexithyme Charakteristika eine wichtige Rolle zu spielen. Dies sollte sowohl diagnostisch als auch in der therapeutischen Zielsetzung berücksichtigt werde

A telephone- and text-message based telemedical care concept for patients with mental health disorders - study protocol for a randomized, controlled study design

<p>Abstract</p> <p>Background</p> <p>As in other countries worldwide, the prevalence of mental disorders in Germany is high. Although numerically a dense network of in- and outpatient psychiatric health services exists, the availability in rural and remote regions is insufficient.</p> <p>In rural regions, telemedical concepts can be a chance to unburden and complement the existing healthcare system. Telemedical concepts consisting of video or telephone consulting show first positive results, but there are only a few studies with a randomized controlled design.</p> <p>To improve the treatment of patients with mental disorders in rural regions, we developed a telemedical care concept based on telephone contacts and text-messages. The primary objective of this study is to evaluate the effects of the telemedical interventions on psychopathological outcomes, e. g. anxiety, depressive symptoms, and somatisation. Secondary objective of the study is the analysis of intervention effects on the frequency of medical contacts with healthcare services. Furthermore, the frequency of patients' crises and the frequency and kind of interventions, initiated by the project nurses will be evaluated. We will also evaluate the acceptance of the telemedical care concept by the patients.</p> <p>Methods/Design</p> <p>In this paper we describe a three-armed, randomized, controlled study. All participants are recruited from psychiatric day hospitals. The inclusion criteria are a specialist-diagnosed depression, anxiety disorder, adjustment disorder or a somatoform disorder and eligibility to participate in the study. Exclusion criteria are ongoing outpatient psychotherapy, planned interval treatment at the day clinic and expected recurrent suicidality and self-injuring behaviour.</p> <p>The interventions consist of regular patient-individual telephone consultations or telephone consultations with complementing text-messages on the patients' mobile phone. The interventions will be conducted during a time period of 6 months.</p> <p>Trial registration</p> <p>This study is registered in the German Clinical Trials Register (DRKS00000662).</p

Rhythm in the speech of a person with right hemisphere damage: Applying the pairwise variability index

Although several aspects of prosody have been studied in speakers with right hemisphere damage (RHD), rhythm remains largely uninvestigated. This study compares the rhythm of an Australian English speaker with right hemisphere damage (due to a stroke, but with no concomitant dysarthria) to that of a neurologically unimpaired individual. The speakers' rhythm is compared using the pairwise variability index (PVI) which allows for an acoustic characterization of rhythm by comparing the duration of successive vocalic and intervocalic intervals. A sample of speech from a structured interview between a speech and language therapist and each participant was analysed. Previous research has shown that speakers with RHD may have difficulties with intonation production, and therefore it was hypothesized that there may also be rhythmic disturbance. Results show that the neurologically normal control uses a similar rhythm to that reported for British English (there are no previous studies available for Australian English), whilst the speaker with RHD produces speech with a less strongly stress-timed rhythm. This finding was statistically significant for the intervocalic intervals measured (t(8) = 4.7, p < .01), and suggests that some aspects of prosody may be right lateralized for this speaker. The findings are discussed in relation to previous findings of dysprosody in RHD populations, and in relation to syllable-timed speech of people with other neurological conditions

Speech rhythm: a metaphor?

Is speech rhythmic? In the absence of evidence for a traditional view that languages strive to coordinate either syllables or stress-feet with regular time intervals, we consider the alternative that languages exhibit contrastive rhythm subsisting merely in the alternation of stronger and weaker elements. This is initially plausible, particularly for languages with a steep ‘prominence gradient’, i.e. a large disparity between stronger and weaker elements; but we point out that alternation is poorly achieved even by a ‘stress-timed’ language such as English, and, historically, languages have conspicuously failed to adopt simple phonological remedies that would ensure alternation. Languages seem more concerned to allow ‘syntagmatic contrast’ between successive units and to use durational effects to support linguistic functions than to facilitate rhythm. Furthermore, some languages (e.g. Tamil, Korean) lack the lexical prominence which would most straightforwardly underpin prominence alternation. We conclude that speech is not incontestibly rhythmic, and may even be antirhythmic. However, its linguistic structure and patterning allow the metaphorical extension of rhythm in varying degrees and in different ways depending on the language, and that it is this analogical process which allows speech to be matched to external rhythms

The Composition of the Modernist Book: Ulysses, A Draft of XXX Cantos and The Making of Americans.

This is a study of the composition of three Modernist first editions: Ulysses (1922), The Making of Americans (1925) and A Draft of XXX Cantos (1930). The bibliographical and figurative commitments made to being in print by Ulysses, A Draft of XXX Cantos and The Making of Americans set a coherent program for reading Modernist texts in their perfected form: in print. The editorial reception of the Modernist book has proceeded, however, with reference to the editorial and bibliographical principles established by the New Bibliographers. In deferring to the authors and manuscripts of Modernist books as the highest source of textual authority, the vital significance of being in print to literary Modernism is obscured. The figure of the ideal Book concentrates the central aesthetic, intellectual and bibliographic problem posed the Modernist book: the making of literature. The rhyme with The Making of Americans is appropriate: this book intensifies and consolidates the propositions made about objective and autonomous composition made more hesitantly by Ulysses and A Draft of XXX Cantos. These three books display a gradual refusal to equate inscription and intention; their composition effaces all traces of a sovereign creative subjectivity. The vision of the book guides Modernist composition, and requires a critical distinction be drawn between manuscripts and printed letters. Modernism must be read in print. The vestigial nostalgia for Romantic modes of textual production and creation in Ulysses is repeated on the placards and proof-pages for the book. Printed drafts are revised and reformed by the pen of the author. The finality asserted by the printed letter is only reluctantly ceded on the publication of Ulysses. The composition of A Draft of XXX Cantos represents a further transition away from the script economy of Romanticism. The interplay between authorial typescripts, early publications and the first edition of A Draft of XXX Cantos assert an intermediate order of Modernist textuality which takes the printed page as its foundation. The Making of Americans relies on the absolute objectivity and anonymity of its composition for the effect of its narrative. Objectivity is the intellectual and aesthetic strategy which produces literature rather than the personality and memory of the author. The impersonality of the apparently automatically written manuscripts and scarcely revised typescripts for The Making of Americans severs the visible links between the writing author and her page. In their unwillingness to corroborate the modes of textual generation described by the New Bibliographers, these three books thematise their own composition as the exemplary Modernist and modern mode of textual generation. The Modernist book attenuates or denies a Romantic connection between the creative hand of the author and the surface image of the page: the mechanisms of print deliberately detach the author from the literary text. The distance of the author from the scene of textual reproduction is measured by the printed book. The composition of this analytical object is not a fallacy but an actuality, commemorated in the archive, enacted by the book. Modernism is the literature of the imprimatur rather than of authorial inscription and accordingly it is towards the first editions of Modernist texts that the attentions of editors and textual scholars must be directed

Patch-based nonlinear image registration for gigapixel whole slide images

Producción CientíficaImage registration of whole slide histology images allows the fusion of fine-grained information-like different immunohistochemical stains-from neighboring tissue slides. Traditionally, pathologists fuse this information by looking subsequently at one slide at a time. If the slides are digitized and accurately aligned at cell level, automatic analysis can be used to ease the pathologist's work. However, the size of those images exceeds the memory capacity of regular computers. Methods: We address the challenge to combine a global motion model that takes the physical cutting process of the tissue into account with image data that is not simultaneously globally available. Typical approaches either reduce the amount of data to be processed or partition the data into smaller chunks to be processed separately. Our novel method first registers the complete images on a low resolution with a nonlinear deformation model and later refines this result on patches by using a second nonlinear registration on each patch. Finally, the deformations computed on all patches are combined by interpolation to form one globally smooth nonlinear deformation. The NGF distance measure is used to handle multistain images. Results: The method is applied to ten whole slide image pairs of human lung cancer data. The alignment of 85 corresponding structures is measured by comparing manual segmentations from neighboring slides. Their offset improves significantly, by at least 15%, compared to the low-resolution nonlinear registration. Conclusion/Significance: The proposed method significantly improves the accuracy of multistain registration which allows us to compare different antibodies at cell level

Genetic determinants of cortical structure (thickness, surface area and volumes) among disease free adults in the CHARGE Consortium

Cortical thickness, surface area and volumes (MRI cortical measures) vary with age and cognitive function, and in neurological and psychiatric diseases. We examined heritability, genetic correlations and genome-wide associations of cortical measures across the whole cortex, and in 34 anatomically predefined regions. Our discovery sample comprised 22,824 individuals from 20 cohorts within the Cohorts for Heart and Aging Research in Genomic Epidemiology (CHARGE) consortium and the United Kingdom Biobank. Significant associations were replicated in the Enhancing Neuroimaging Genetics through Meta-analysis (ENIGMA) consortium, and their biological implications explored using bioinformatic annotation and pathway analyses. We identified genetic heterogeneity between cortical measures and brain regions, and 160 genome-wide significant associations pointing to wnt/β-catenin, TGF-β and sonic hedgehog pathways. There was enrichment for genes involved in anthropometric traits, hindbrain development, vascular and neurodegenerative disease and psychiatric conditions. These data are a rich resource for studies of the biological mechanisms behind cortical development and aging

Using keystroke logging to understand writers’ processes on a reading-into-writing test

Background Integrated reading-into-writing tasks are increasingly used in large-scale language proficiency tests. Such tasks are said to possess higher authenticity as they reflect real-life writing conditions better than independent, writing-only tasks. However, to effectively define the reading-into-writing construct, more empirical evidence regarding how writers compose from sources both in real-life and under test conditions is urgently needed. Most previous process studies used think aloud or questionnaire to collect evidence. These methods rely on participants’ perceptions of their processes, as well as their ability to report them. Findings This paper reports on a small-scale experimental study to explore writers’ processes on a reading-into-writing test by employing keystroke logging. Two L2 postgraduates completed an argumentative essay on computer. Their text production processes were captured by a keystroke logging programme. Students were also interviewed to provide additional information. Keystroke logging like most computing tools provides a range of measures. The study examined the students’ reading-into-writing processes by analysing a selection of the keystroke logging measures in conjunction with students’ final texts and interview protocols. Conclusions The results suggest that the nature of the writers’ reading-into-writing processes might have a major influence on the writer’s final performance. Recommendations for future process studies are provided

Subclinical thyroid dysfunction and depressive symptoms: protocol for a systematic review and individual participant data meta-analysis of prospective cohort studies

INTRODUCTION: Prospective cohort studies on the association between subclinical thyroid dysfunction and depressive symptoms have yielded conflicting findings, possibly because of differences in age, sex, thyroid-stimulating hormone cut-off levels or degree of baseline depressive symptoms. Analysis of individual participant data (IPD) may help clarify this association. METHODS AND ANALYSIS: We will conduct a systematic review and IPD meta-analysis of prospective studies on the association between subclinical thyroid dysfunction and depressive symptoms. We will identify studies through a systematic search of the literature in the Ovid Medline, Ovid Embase, Cochrane Central Register of Controlled Trials (CENTRAL) and Cumulative Index to Nursing and Allied Health Literature (CINAHL) databases from inception to April 2019 and from the Thyroid Studies Collaboration. We will ask corresponding authors of studies that meet our inclusion criteria to collaborate by providing IPD. Our primary outcome will be depressive symptoms at the first available individual follow-up, measured on a validated scale. We will convert all the scores to the Beck Depression Inventory scale. For each cohort, we will estimate the mean difference of depressive symptoms between participants with subclinical hypothyroidism or hyperthyroidism and control adjusted for depressive symptoms at baseline. Furthermore, we will adjust our multivariable linear regression analyses for age, sex, education and income. We will pool the effect estimates of all studies in a random-effects meta-analysis. Heterogeneity will be assessed by I2. Our secondary outcomes will be depressive symptoms at a specific follow-up time, at the last available individual follow-up and incidence of depression at the first, last and at a specific follow-up time. For the binary outcome of incident depression, we will use a logistic regression model. ETHICS AND DISSEMINATION: Formal ethical approval is not required as primary data will not be collected. Our findings will have considerable implications for patient care. We will seek to publish this systematic review and IPD meta-analysis in a high-impact clinical journal. PROSPERO REGISTRATION NUMBER: CRD42018091627