Hawking radiation, Unruh radiation and the equivalence principle

We compare the response function of an Unruh-DeWitt detector for different space-times and different vacua and show that there is a {\it detailed} violation of the equivalence principle. In particular comparing the response of an accelerating detector to a detector at rest in a Schwarzschild space-time we find that both detectors register thermal radiation, but for a given, equivalent acceleration the fixed detector in the Schwarzschild space-time measures a higher temperature. This allows one to locally distinguish the two cases. As one approaches the horizon the two temperatures have the same limit so that the equivalence principle is restored at the horizon.Comment: 9 pages. Added references and added discussion. To be published in PR

Altered images : the relations between design representations and design practice

As information systems move out of the office into the wider world and are merged with mobile appliances, buildings and even clothing, the representations traditionally used in any one discipline may not be adequate for understanding these new domains. Design representations are &lsquo;ways of seeing and not seeing&rsquo;. Despite the central role representations play in design, the information systems design community has little understanding of the relation, ideal or actual, between design practice and design representation. This paper reports on an extensive design case study that aims at increasing understanding of the nature and affordances of representations in the design process and argues for the need for information systems as a discipline to open up discussion of the design representations that may be required to effectively design systems that mix traditional IS with disciplines such as industrial design, architecture and fashion design.<br /

Impact of ROS 2 Node Composition in Robotic Systems

The Robot Operating System 2 (ROS 2) is the second generation of ROS representing a step forward in the robotic framework. Several new types of nodes and executor models are integral to control where, how, and when information is processed in the computational graph. This paper explores and benchmarks one of these new node types -- the Component node -- which allows nodes to be composed manually or dynamically into processes while retaining separation of concerns in a codebase for distributed development. Composition is shown to achieve a high degree of performance optimization, particularly valuable for resource-constrained systems and sensor processing pipelines, enabling distributed tasks that would not be otherwise possible in ROS 2. In this work, we briefly introduce the significance and design of node composition, then our contribution of benchmarking is provided to analyze its impact on robotic systems. Its compelling influence on performance is shown through several experiments on the latest Long Term Support (LTS) ROS 2 distribution, Humble Hawksbill.Comment: IEEE Robotics and Automation Letters, 202

Koinonia

The University as a Place of Spiritual Formation, Eugene Peterson and Steve Moore President\u27s Corner Into the Future: Highlights of the 1994 ACSD National Conference CoCCA: Community Service Finds Its Way into the Freshmen Orientation Program Thanks for the Memories & Much Morehttps://pillars.taylor.edu/acsd_koinonia/1034/thumbnail.jp

Identity, Power And Fragmentation in Cyberspace: Technology Appropriation by Young People

Why and how do young people adopt and use information and communication technology? Based on social constructivist theory and empirical research we propose a model of ‘technology appropriation’. When young people are faced with a new technology we have observed three outcomes: non-appropriation, appropriation and disappropriation. How the technology is affected by, and in turn affects, young peoples’ identity, their experience of power and the degree of cohesion in their activities and relations with others appears to be critical in determining the appropriation outcome. The novelty of this work lies in ‘opening up’ the way that technology is shaped by users after development; in describing the process of appropriation and in examining some of the key influences upon young people’s appropriation of technology. This work contributes to a body of work that sees technology as socially constructed

Organizing a Student Poster Session in an ASEE Section Conference

Student poster sessions at conferences can be valuable experiences for undergraduate and graduate students and can enrich the conference program for all participants. Student poster presentations beyond the local campus can provide additional experience in professional communication (especially in preparing succinct abstracts and in effective visual design), can prepare students for future conference participations, and can facilitate student-faculty interaction. Several issues exist when including student poster sessions in engineering education conferences. How can the content of posters be related to an engineering education theme? How are communication principles of audience and purpose incorporated into the session guidelines and review process? What approaches facilitate student participation? What roles do faculty advisors have? The organization of a student poster component at section ASEE conferences is described including session objectives, submission process, acceptance criteria, best-poster rubrics, and suggestions for future implementation. Lessons learned during two years of hosting such as poster session are highlighted especially with regard to the abstract and poster evaluation rubrics. The approach seeks to disseminate existing student project work, to involve students in formal review and revision processes, and to recognize the role of faculty advisors

Recruiting and retaining rural general practitioners : A mismatch between research evidence and current initiatives?

This paper investigates the possible mismatch between current initiatives to attract and retain general practitioners (GPs) to rural areas, and Australian research evidence about the most significant factors affecting recruitment and retention. The results reported here are part of a broader project that aims to use evidence-based research to enhance rural GP workforce planning and management. This phase of the project analysed research reports evaluating the outcome of programs and services aimed at improving rural recruitment and retention. The search strategies for this review included: key word searches of electronic database publications over the last 15 years; hand searching of relevant journals; trawling websites of relevant organisations; and direct contact with relevant organisations to request copies of “grey” literature such as unpublished reports. A total of 22 Australian studies were identified that met these criteria. (It is acknowledged that many other initiatives have been tried, but evaluation reports for these do not exist or were not obtainable. Similarly, many other studies have examined recruitment or retention without evaluating workforce initiatives.) The 22 studies evaluated nine major recruitment and retention initiatives including: medical course admission criteria (2 studies); rural placements (7); student scholarships (1); financial incentives (2); continuing medical education (5); universitylinked rural practices (1); case management (1); and overseas-trained doctors (2); an community capacity-building (1). Demonstrating “causation” requires strong internal and external validity. Overall, however, there is not yet strong empirical evidence for the efficacy of the any of these initiatives. The methodological problems consistently identified in our analysis were: no use of comparison or control groups; an overreliance on surveys of GPs’ attitudes or intentions rather than actual behaviours; inconsistent definitions of key variables including “rural” and “retention”; inadequate sample sizes or unrepresentative samples and selection biases; inconsistent use of definitions of key variables including “rural” and “retention”; cross-sectional and retrospective designs; insufficient information on statistical analyses; and qualitative studies that did not formally and systematically apply techniques for strengthening credibility and transferability. Moreover, many of these initiatives do not appear to be closely aligned with the factors usually thought to influence recruitment or retention. The learnings from this project support the strategic and accessible use of evidencebased health care for rural workforce issues. Government departments and agencies should invest in rigorous evaluations that are then made publicly available. Policy and program development can benefit by drawing upon sound research knowledge. Rural communities can also become more informed and discerning consumers of this information.E