A theory of human error

Human errors tend to be treated in terms of clinical and anecdotal descriptions, from which remedial measures are difficult to derive. Correction of the sources of human error requires an attempt to reconstruct underlying and contributing causes of error from the circumstantial causes cited in official investigative reports. A comprehensive analytical theory of the cause-effect relationships governing propagation of human error is indispensable to a reconstruction of the underlying and contributing causes. A validated analytical theory of the input-output behavior of human operators involving manual control, communication, supervisory, and monitoring tasks which are relevant to aviation, maritime, automotive, and process control operations is highlighted. This theory of behavior, both appropriate and inappropriate, provides an insightful basis for investigating, classifying, and quantifying the needed cause-effect relationships governing propagation of human error

Venture Capital Vs. Trade Credit Financing: Is There A Bias In Favor Of Venture Capital And What Is The Impact On Students?

The purpose of this dissertation was to examine whether entrepreneurship education demonstrates a bias favoring venture capital (VC) financing while marginalizing trade credit financing. The effect of this perceived bias was also explored to determine the impact on students studying entrepreneurship. In the history of entrepreneurial studies, literature revealed VC was a relatively new and rare source of financing that impacted a very small percentage of entrepreneurial ventures. In contrast, trade credit existed for thousands of years and was shown to benefit virtually every type of business model, from start-up to maturity. The research questions posed were addressed using two methods: textbook analysis and survey instrument. Data were collected through an analysis (N=13) of entrepreneurship and business textbooks quantifying the coverage of trade credit versus VC. A survey instrument distributed to a sample (N=126) of entrepreneurship students at 11four-year U.S. universities asked students about their exposure to and understanding of VC and trade credit. Analysis of the data revealed a significant bias existed in favor of VC in textbooks as well as in classroom content, while trade credit financing was largely overlooked. As a result, students indicated they were heavily exposed to VC and unfamiliar with trade credit. The data also revealed that despite significant exposure to the term venture capital in curriculum, students only possessed a basic understanding of how VC actually worked. The primary conclusion was that entrepreneurship educators were doing an inadequate job of informing students as to the practical finance options available to them should they choose to pursue a venture at some point in the future

Research on display scanning, sampling, and reconstruction using separate main and secondary tracking tasks

Dynamic model for effects of random scanning and sampling on human operator tracking performanc

STEM Bridges: Evolution of an Academic Library STEM Outreach Program

Big Orange STEM Saturday (BOSS) is a sustainable model of outreach that fosters the STEM cycle of discovery and learning experiences. Through this program, the library creates and reinforces a bridge between secondary educational experiences and higher education that facilitates the transfer of knowledge from the classroom to the world. Local high school students are able to engage with experts in several different ways to explore what STEM has to offer and to look beyond their current experiences. This approach creates a venue for STEM teaching spaces outside the school classroom for enrichment and innovation. Over the past 5 years, the variety of experiences offered at BOSS have expanded and the reputation of the program has grown. This article explores the challenges, lessons, and impact that this program has had on its constituents, with a particular focus on the impact the library can have when exploring nontraditional areas of support and outreach

How resilience is framed matters for governance of coastal social-ecological systems

Effective governance of social-ecological systems (SES) is an enduring challenge, especially in coastal environments where accelerating impacts of climate change are increasing pressure on already stressed systems. While resilience is often proposed as a suitable framing to re-orient governance and management, the literature includes many different, and sometimes conflicting, definitions and ideas that influence how the concept is applied, especially in coastal environments. This study combines discourse analysis of the coastal governance literature and key informant interviews in Tasmania, Australia, demonstrating inconsistencies and confusion in the way that resilience is framed in coastal governance research and practice. We find that resilience is most often framed as (1) a rate of recovery from disturbance or (2) the process of acting in response to, or anticipation of, a disturbance. A third framing considers resilience as an emergent property of SESs. This framing, social-ecological resilience, accounts for multiple configurations of SES, which necessitates adaptation and transformation strategies to address changes across temporal and spatial scales. Coastal managers recognised the value of this third framing for governing coastal SESs, yet the confusion and inconsistency in the literature was also evident in how they understood and applied resilience in practice. Expanding the use of social-ecological resilience is essential for more effective coastal governance, given the dynamics of coastal SESs and the intensity of social, economic, and environmental drivers of change these systems face. However, this requires addressing the unclear, confused, and superficial use of resilience-oriented concepts in research and policy discourse

Angles between subspaces in two-way designs

An experimenter is interested in the effect of several factors, such as age, sex, number of eggs eaten per day, and weight, on blood serum cholesterol. Define as a cell, all observations taken from people who have been identically classified with respect to all factors. In the above case, the observations are blood serum cholesterol counts. An observation may be thought of as an observed value of a random variable, and all of the observations in a cell may be modeled by random variables which are assumed to be independent and identically distributed with unknown mean and variance. The unknown mean and variance are, respectively, the cell mean and cell variance. Suppose one wishes to compare the mean, or average, amount of blood serum cholesterol of two or more cells to each other. For example, compare men over 30 years of age and under 175 pounds who eat one egg per day with women over 30 years of age and under 175 pounds who eat one egg per day, and determine if the blood serum cholesterol count is different for these two cells. This kind of comparison is accomplished by an analysis of variance (ANOVA). An ANOVA is an analysis of the measurements in the various cells, for the purpose of determining if these observed differences represent actual differences between cell means or merely reflect random fluctuations in the data

Functional requirements for the man-vehicle systems research facility

The NASA Ames Research Center proposed a man-vehicle systems research facility to support flight simulation studies which are needed for identifying and correcting the sources of human error associated with current and future air carrier operations. The organization of research facility is reviewed and functional requirements and related priorities for the facility are recommended based on a review of potentially critical operational scenarios. Requirements are included for the experimenter's simulation control and data acquisition functions, as well as for the visual field, motion, sound, computation, crew station, and intercommunications subsystems. The related issues of functional fidelity and level of simulation are addressed, and specific criteria for quantitative assessment of various aspects of fidelity are offered. Recommendations for facility integration, checkout, and staffing are included

Pennsylvania Folklife Vol. 33, No. 1

• Ritual and Folklore in Pennsylvania\u27s Wyoming Region: Old to New World Wonder • Ordinary Architecture of the Pennsylvania Germans: The Turnpike Houses • Set thy House in Order : Inheritance Patterns of the Colonial Pennsylvania Germans • The Literature on Fences, Walls and Hedges as Cultural Landscape Features • Aldes un Neieshttps://digitalcommons.ursinus.edu/pafolklifemag/1101/thumbnail.jp

Reasoning about the executability of goal-plan trees

User supplied domain control knowledge in the form of hierarchically structured agent plans is at the heart of a number of approaches to reasoning about action. This knowledge encodes the “standard operating procedures” of an agent for responding to environmental changes, thereby enabling fast and effective action selection. This paper develops mechanisms for reasoning about a set of hierarchical plans and goals, by deriving “summary information” from the conditions on the execution of the basic actions forming the “leaves” of the hierarchy. We provide definitions of necessary and contingent pre-, in-, and postconditions of goals and plans that are consistent with the conditions of the actions forming a plan. Our definitions extend previous work with an account of both deterministic and non-deterministic actions, and with support for specifying that actions and goals within a (single) plan can execute concurrently. Based on our new definitions, we also specify requirements that are useful in scheduling the execution of steps in a set of goal-plan trees. These requirements essentially define conditions that must be protected by any scheduler that interleaves the execution of steps from different goal-plan trees

Original biographies from the Dictionary of African Christian Biography

A publication of the Dictionary of African Christian Biography with U.S. offices located at the Center for Global Christianity and Mission at Boston University. The editors are pleased to offer the first annual cumulative volume of the Journal of African Christian Biography, the monthly scholarly publication that was launched in June of 2016. Since then, the life stories of twelve individuals who played vital roles in and through their faith communities have been published online as free downloads. But it is important that a selection of DACB stories be more readily available to those without access to the internet. As I mentioned in the fall 2016 newsletter of the DACB, each issue of the journal is available in its e-journal, on-line version, where it is configured either as A4 or 8.5 x 11 format printable as booklets, ready for local printing and binding or stapling. Our intention is to make it easy for academics and church leaders in various parts of Africa to make print copies of the journal available to their students, colleagues or church members. And so it is with this cumulative volume.This issue focuses on: 1. "Walatta Petros and Hakalla Amale, Pious Women of Ethiopia," with commentary by Dr. Jonathan Bonk, Project Director. 2. Walatta Petros. 3. Hakalla Amale. 4. Bishop Josiah Kibira of Tanzania, Ecumenical Statesman. 5. Josiah Mutabuzi Isaya Kibira. 6. Josiah Kibira. 7. David Lonkibiri Windibiziri. 8. Abiodun Babatunde Lawrence. 9. Dominic Ignatius Ekandem. 10. William Wadé Harris, Prophet-Evangelist of West Africa: His Life, Message, Praxis, Heritage, and Legacy. 11. William Wadé Harris. 12. Michael Timneng and Jeremiah Chi Kangsen: Christianity Beyond the Missionary Presence in Cameroon. 13. Michael Timneng. 14. Jeremiah Chi Kangsen. 15. Rainisoalambo, Ravelonjanahary, and Volahavana Germaine (Nenilava): Revival Leaders of Madagascar. 16. Rainisoalambo. 17. Ravelonjanahary. 18. Volahavana Germaine (Nenilava). 19. Recent Print and Digital Resourcews Related to Christianity in Africa