Clustering with shallow trees

We propose a new method for hierarchical clustering based on the optimisation of a cost function over trees of limited depth, and we derive a message--passing method that allows to solve it efficiently. The method and algorithm can be interpreted as a natural interpolation between two well-known approaches, namely single linkage and the recently presented Affinity Propagation. We analyze with this general scheme three biological/medical structured datasets (human population based on genetic information, proteins based on sequences and verbal autopsies) and show that the interpolation technique provides new insight.Comment: 11 pages, 7 figure

Stevens\u27s Ratchet: When the Court Should Decide Not to Decide

Hidden underneath the racy death penalty issues in Kansas v. Marsh lurks a seemingly dull procedural issue addressed only in separate opinions by Justices Stevens and Scalia: whether the Court should have heard the case in the first place. As he did in three cases from the Court’s 2005 term, Justice Stevens argued in Marsh that the Court has no legitimate interest in reviewing state court decisions that overprotect federal constitutional rights. Instead, the Supreme Court should exercise its certiorari power to tip the scales against states and in favor of individuals. Granting certiorari in Marsh, Stevens argued, was not motivated by a desire to create uniformity in interpretation of federal law, but was motivated by “[n]othing more than an interest in facilitating the imposition of the death penalty.” Justice Scalia vehemently disagreed, writing that Stevens’s argument rested on a “misguided view of federalism” and ignored the need for integ-rity and uniformity of federal law. He believes that would create a “crazy quilt,” in which each state could interpret the federal Constitution as it saw fit so long each such interpretation gave individuals more protection than necessary

Stevens\u27s Ratchet: When the Court Should Decide Not to Decide

Hidden underneath the racy death penalty issues in Kansas v. Marsh lurks a seemingly dull procedural issue addressed only in separate opinions by Justices Stevens and Scalia: whether the Court should have heard the case in the first place. As he did in three cases from the Court’s 2005 term, Justice Stevens argued in Marsh that the Court has no legitimate interest in reviewing state court decisions that overprotect federal constitutional rights. Instead, the Supreme Court should exercise its certiorari power to tip the scales against states and in favor of individuals. Granting certiorari in Marsh, Stevens argued, was not motivated by a desire to create uniformity in interpretation of federal law, but was motivated by “[n]othing more than an interest in facilitating the imposition of the death penalty.” Justice Scalia vehemently disagreed, writing that Stevens’s argument rested on a “misguided view of federalism” and ignored the need for integ-rity and uniformity of federal law. He believes that would create a “crazy quilt,” in which each state could interpret the federal Constitution as it saw fit so long each such interpretation gave individuals more protection than necessary

Combat and Warfare in the Early Paleolithic and Medically Unexplained Musculo-Facial Pain in the 21st Century War Veterns and Active-Duty Military Personnel

In a series of recent articles, we suggest that family dentists, military dentists and psychiatrists with expertise in posttraumatic stress disorder (especially in the Veterans Health Administration) are likely to see an increased number of patients with symptomatic jaw-clenching and early stages of tooth- grinding (Bracha et al., 2005). Returning warfighters and other returnees from military deployment may be especially at risk for high rates of clenching- induced masticatory muscle disorders at early stages of incisor grinding. The literature we have recently reviewed strongly supports the conclusion that clenching and grinding may primarily be a manifestation of experiencing extreme fear or severe chronic distress (respectively). We have recently reviewed the clinical and paleoanthropological literature and have noted that ancestral warfare and ancestral combat, in the early Paleolithic Environment of Evolutionary Adaptedness (EEA) may be a neglected factor explaining the conservation of the archaic trait of bite-muscle strengthening. We have hypothesized that among ancestral warriors, jaw clenching may have rapidly strengthened the two primary muscles involved in biting, the masseter muscles and the much larger temporalis muscles. The strengthening of these muscles may have served the purpose of enabling a stronger, deeper, and therefore more lethal, defensive bite for early Paleolithic humans. The neuroevolutionary perspective presented here may be novel to many dentists. However, it may be useful in patient education and in preventing progression from jaw-clenching to chronic facial pain

Resilience Through the Lens of Interactionism: A Systematic Review

This systematic review presents findings from a conceptual and methodological review of resilience measures using an interactionist theoretical framework. The review is also intended to update findings from previous systematic reviews. Two databases (EBSCOHost and Scopus) were searched to retrieve empirical studies published up until 2013, with no lower time limit. All articles had to meet specific inclusion criteria, which resulted in 17 resilience measures selected for full review. Measures were conceptually evaluated against an interactionist framework and methodologically reviewed using Skinner's (1981) validity evidence framework. We conclude that inconsistencies associated with the definition and operationalization of resilience warrant further conceptual development to explain resilience as a dynamic and interactive phenomenon. In particular, measures of resilience may benefit from a greater focus on within-person variance typically associated with behavioral consistency across situations. The use of alternative measurement modalities to self-report scales, such as situational judgment tests, is proposed as a way of advancing knowledge in this area

Self-guided mindfulness and cognitive behavioural practices reduce anxiety in autistic adults: A pilot 8-month waitlist-controlled trial of widely available online tools

Anxiety in autism is an important treatment target because of its consequences for quality of life and wellbeing. Growing evidence suggests that Cognitive Behaviour Therapies (CBT) and Mindfulness-Based Therapies (MBT) can ameliorate anxiety in autism but cost-effective delivery remains a challenge. This pilot randomized controlled trial examined whether online CBT and MBT self-help programmes could help reduce anxiety in 54 autistic adults who were randomly allocated to either an online CBT (n=16) or MBT (n=19) programme or a waitlist control group (WL; n=19). Primary outcome measures of anxiety, secondary outcome measures of broader wellbeing, and potential process of change variables were collected at baseline, after programme completion, and then 3 and 6 months post-completion. Baseline data confirmed that intolerance of uncertainty and emotional acceptance accounted for up to 61% of self-reported anxiety across all participants. The 23 participants who were retained in the active conditions (14 MBT, 9 CBT) showed significant decreases in anxiety that were maintained over 3, and to some extent also 6 months. Overall, results suggest that online self-help CBT and MBT tools may provide a cost-effective method for delivering mental health support to those autistic adults who can engage effectively with online support tools

Numerical Simulation for Heat Transfer in Liquid Cooling System of Electronic Components

In this study, the task of optimizing the thermal liquid cooling system distributor of electronic components by means of numerical simulation of heat transfer in the investigated object. This task allowed us to find the optimal geometric parameters of the thermal spreader

An exploration of applicant perceptions of asynchronous video MMIs in medical selection

Over the last two decades, technological advancements internationally have meant that the Internet has become an important medium for recruitment and selection. Consequently, there is an increased need for research that examines the effectiveness of newer technology-mediated selection methods. This exploratory research study qualitatively explored applicant perceptions of fairness of asynchronous video interviews used in medical selection. Ten undergraduate medical students participated in a pilot asynchronous multiple-mini interview and were invited to share their experiences and perceptions in a follow-up interview. The data was transcribed verbatim and analysed using template analysis, with Gilliland’s (1993) organisational justice theory guiding the original template. Many of the original themes from Gilliland’s model were uncovered during analysis. Additionally, some significant themes were identified that did not form part of the original template and were therefore added to the final coding template – these were specifically relating to technology, including acceptability in a medical context; technical issues and adverse impact. Overall, results suggested that participants perceived asynchronous video interviews to be a fair method of selection. However, participants thought asynchronous interviews should only be used as part of an extensive selection process and furthermore, should not replace face-to-face interviews. Findings are discussed in line with existing research of fairness perceptions and justice theory in selection (Gilliland, 1993) and implications for research and practice are presented

EFFECTS OF METHOTREXATE ON PROLIFERATION OF HUMAN KERATINOCYTES IN VITRO

Normal human keratinocytes, propagated as epithelial outgrowths in vitro, were exposed to different concentrations of methotrexate (MTX) for different periods of time. After a 1-hr exposure, DNA synthesis was inhibited in a reversible manner. No change in the mitotic index was observed. After a 6-hr exposure, both DNA synthesis and mitosis were inhibited, again in a reversible fashion. Prolonged exposure (24 hr) resulted in irreversible mitotic inhibition even when followed by recovery periods of 168 hr. The effective concentrations of MTX in vitro were similar to those described previously in vivo