Competing and complementary risk (CCR) problems are often modelled using a class of distributions of the maximum, or minimum, of a random number of independent and identically distributed random variables, called the CCR class of distributions. While CCR distributions generally do not have an easy-to-calculate density or probability mass function, two special cases, namely the Poisson–exponential and exponential–geometric distributions, can easily be calculated. Hence, it is of interest to approximate CCR distributions with these simpler distributions. In this paper, we develop Stein’s method for the CCR class of distributions to provide a general comparison method for bounding the distance between two CCR distributions, and we contrast this approach with bounds obtained using a Lindeberg argument. We detail the comparisons for Poisson–exponential, and exponential–geometric distributions.

In Ghana, the institution of chieftaincy, a traditional political governance system, is saddled with a number of conflicts which have far-reaching implications for food security in affected communities. This study examined how the infamous Bimbilla chieftaincy conflicts in the Northern Region of Ghana undermined the food security situation in the context of hunger, famine and sudden rise in food prices. A total of 383 respondents were randomly and purposely selected in a convergent mixed-methods study design. Questionnaires, interviews and focus group discussions were the main primary data collection methods. The study revealed that the chieftaincy conflicts significantly impacted hunger (β = –0.152, t = –2.807, p = 0.005) and famine (β = 0.188, t = 3.443, p = 0.001). A sudden increase in food prices (β = 0.006, t = 0.113, p = 0.910) stood as the only food security factor which was not affected substantially by the chieftaincy conflicts.

Trajectory optimization is a critical research area in robotics and automation, especially in manufacturing industries where mechanical systems are often required to minimize the execution time or the consumed energy. In this context, the most common mechanical systems are those with a single degree of freedom because of their simplicity and ease of control. In this paper, we present an approach for the online optimization of minimum-time and minimum-energy trajectories for a robotic system with one degree of freedom. Point-to-point motions of the considered linear axis are planned online, without idle times, by leveraging a verified dynamic model of the robotic system, which also includes an accurate identification of friction parameters. Both minimum-time and minimum-energy trajectories are considered, and the performance of the online optimization using a selected open-source optimization tool is verified in different dynamic conditions of the system. The results of extensive experiments on a belt-driven robotic axis demonstrate the feasibility and the energy-saving capabilities of the proposed approach, as well as the flexibility of the online trajectory optimization in different scenarios, while meeting the kinematics and dynamics limits of the system and guaranteeing low computational time.

Cognitive therapy for post-traumatic stress disorder (PTSD) is recommended in a range of national and international guidelines. This clinical guidance paper specifically focuses on cognitive therapy for PTSD (CT-PTSD) where racism has been part of the index trauma event(s). It aims to support CBT therapists to maintain fidelity to the CT-PTSD model but also ensure that racism is integrated into the formulation and interventions in ways that are sensitive and validating. It explores barriers to this occurring ranging from societal factors (e.g. ongoing racism, discouragement from discussing racism), to therapist factors (e.g. lack of understanding of racism, lack of own understanding of racialised identity, anxiety, lack of knowledge, skills and confidence) and patient factors (e.g. shame, fear of therapist response). The paper aims to provide guidance on how these can be addressed alongside case illustrations and practical considerations for therapists and supervisors.

Efficient local trajectory optimization of the coordinated manipulator is a bottleneck task in the narrow feeding scenario. To optimize the trajectory locally and generate collision-free trajectories with local support performance, the analytical reinforcement method is proposed. Firstly, multiple coordinated machines operating in the narrow space are transformed into decentralized dynamic constraints for the target manipulator. Combined with the circle envelope method in the dynamic constraint, the collision-free gradient optimization function determines the support region of the local optimal trajectory. Based on the forward kinematics and inverse kinematics method, the collision-prone pose of the target manipulator outside the support region is analytically optimized. And chi-square distribution further ensures the smooth interpolation of the variable-period trajectory outside the fixed-period support region. For the emergency collision avoidance of the coordinated manipulator in the flexible stamping line, the analytical reinforcement method is successfully verified by generating the collision-free and smooth trajectory. It provides an optimization direction for rapidly improving the work efficiency of multi-machine coordination in the narrow feeding scenario.

The cluster of psychiatric concepts that includes “personality disorders,” “psychopathy” and “moral insanity” has long been controversial and uncertain. This article investigates the concept of “psychopathy” in 1950s England and shows how this ambiguity is not a flaw or failure in the concept but absolutely necessary for the role it carries out: policing broad areas of social life. A case of Munchausen syndrome (a type of “psychopathy”) in the late 1950s still functions as a precedent in the welfare system today, denying claimants sickness benefit, “closing a loophole,” and exemplifying the usefulness of this uncertainty.

This paper analyzes how the founding figure of German agricultural science grappled with the traditional hierarchies of knowledge undergirding the eighteenth-century agricultural improvement debates. By tracing the ways in which physical labor and farm management shaped Albert Thaer’s doctrine of rational agriculture, I look at his position through the lens of a labor history of science. A close examination of the legitimizing strategies that Thaer deployed in order to counter persistent cultural taboos will highlight the role of conceptual work in pushing the bounds of legitimate scholarly practice. The paper concludes by arguing that changes in the relationship between scientific identity and manual labor form a transformative element in the history of science that can also be considered a criterion of discontinuity between its configurations before and after 1800.

Semi-simplicial and semi-cubical sets are commonly defined as presheaves over, respectively, the semi-simplex or semi-cube category. Homotopy type theory then popularized an alternative definition, where the set of $n$-simplices or $n$-cubes are instead regrouped into the families of the fibers over their faces, leading to a characterization we call indexed. Moreover, it is known that semi-simplicial and semi-cubical sets are related to iterated Reynolds parametricity, respectively, in their unary and binary variants. We exploit this correspondence to develop an original uniform indexed definition of both augmented semi-simplicial and semi-cubical sets, and fully formalize it in Coq.