Empirical Investigation of Interactive Highway Safety Design Model Accident Prediction Algorithm: Rural Intersections

2003 ◽  
Vol 1840 (1) ◽  
pp. 78-86 ◽  
Author(s):  
Craig Lyon ◽  
Jutaek Oh ◽  
Bhagwant Persaud ◽  
Simon Washington ◽  
Joe Bared
Keyword(s):  
Research Effort ◽  
Methodological Approach ◽  
The United States ◽  
Highway Safety ◽  
Design Model ◽  
Prediction Algorithm ◽  
Parameter Estimates ◽  
Wide Range ◽  
Safety Design ◽  
The Impact

One major gap in transportation system safety management is the ability to assess the safety ramifications of design changes for both new road projects and modifications to existing roads. To fulfill this need, FHWA and its many partners are developing a safety forecasting tool, the Interactive Highway Safety Design Model (IHSDM). The tool will be used by roadway design engineers, safety analysts, and planners throughout the United States. As such, the statistical models embedded in IHSDM will need to be able to forecast safety impacts under a wide range of roadway configurations and environmental conditions for a wide range of driver populations and will need to be able to capture elements of driving risk across states. One of the IHSDM algorithms developed by FHWA and its contractors is for forecasting accidents on rural road segments and rural intersections. The methodological approach is to use predictive models for specific base conditions, with traffic volume information as the sole explanatory variable for crashes, and then to apply regional or state calibration factors and accident modification factors (AMFs) to estimate the impact on accidents of geometric characteristics that differ from the base model conditions. In the majority of past approaches, AMFs are derived from parameter estimates associated with the explanatory variables. A recent study for FHWA used a multistate database to examine in detail the use of the algorithm with the base model-AMF approach and explored alternative base model forms as well as the use of full models that included nontraffic-related variables and other approaches to estimate AMFs. That research effort is reported. The results support the IHSDM methodology.

A New World Economic order formation

2021 ◽  
pp. 932-950
Author(s):  
Vladislav Vyacheslavovich Emelyanov
Keyword(s):  
Oil And Gas ◽  
World Order ◽  
The United States ◽  
New Order ◽  
The West ◽  
Wide Range ◽  
The World ◽  
The Usa ◽  
World Economic Order ◽  
The Impact

Every few decades, the world order changes due to various geopolitical, economic and other circumstances. For example, as a result of globalization, the world order has undergone significant changes in the last forty years. Globalization has led to the destruction of the postwar world order, as well as to world leadership by the United States and the West. However, in recent decades, as a result of globalization, the U.S. and the West began to cede their leadership to developing countries, so there is now a change in the economic structure of relations in the world system. Today the center of economic growth is in the East, namely in Asia. There are no new superpowers in the world at the moment, but the unipolar world will cease to exist due to the weakening of the U. S. leadership, which will lead to a change in the world order. A new leader, which may replace the U. S., will not have as wide range of advantages as the USA has. Most likely, the essence of the new order will be to unite the largest countries and alliances into blocks, for example, the USA together with the Trans-Pacific Partnership, the EU, etc. The article outlines forecasts of GDP growth rates as well as the global energy outlook; analyzes the LNG market as well as the impact of the pandemic on the global oil and gas market; and lists the characteristics of U. S. geopolitics.

scholarly journals Quebec’s Economic and Commercial Linkages with the United States, 1994–2017

2017 ◽  
Author(s):  
Earl H. Fry
Keyword(s):  
United States ◽  
Trade Agreement ◽  
The United States ◽  
The North ◽  
Nation States ◽  
Wide Range ◽  
The Us ◽  
Us Government ◽  
Big Picture ◽  
The Impact

This article examines the ebb and flow of the Quebec government’s economic and commercial relations with the United States in the period 1994–2017. The topic demonstrates the impact of three major forces on Quebec’s economic and commercial ties with the US: (1) the North American Free Trade Agreement (NAFTA) which became operational in 1994 and was fully implemented over a 15-year period; (2) the onerous security policies put in place by the US government in the decade following the horrific events of 11 September 2001; and (3) changing economic circumstances in the United States ranging from robust growth to the worst recession since the Great Depression of the 1930s. The article also indicates that the Quebec government continues to sponsor a wide range of activities in the United States, often more elaborate and extensive than comparable activities pursued by many nation-states with representation in the US. 1 1 Stéphane Paquin, ‘Quebec-U.S. Relations: The Big Picture’, American Review of Canadian Studies 46, no. 2 (2016): 149–61.

scholarly journals Living and Teaching Internationally: Teachers Talk about Personal Experiences, Benefits, and Challenges

2020 ◽  
Vol 19 (1) ◽  
pp. 38-53
Author(s):  
Nelly Sierra Ospina ◽  
Sergio Lopera Medina
Keyword(s):  
Classroom Management ◽  
Cultural Awareness ◽  
School Administrators ◽  
The United States ◽  
Structured Interview ◽  
Study Data ◽  
Intercultural Development ◽  
Life Styles ◽  
Wide Range ◽  
The Impact

This study reports on the impact of international visiting faculty’s teaching experiences in the United States on their personal, professional, and intercultural development. It is based on the principles of qualitative research and can be described as a case study. Data collection involved a questionnaire, a written narrative, and a semi-structured interview with each of a number of teachers. Participants included a group of 22 visiting faculty. Three main categories, each of which can be subdivided into benefits and challenges, emerged from the analysis: intercultural matters, professional matters, and personal matters. A wide range of benefits was identified, suggesting that the participants adapted to new life styles, became more mature, obtained a deeper understanding of themselves, reaffirmed their own educational values and philosophies, raised cultural awareness, became more flexible, and developed attitudes that involved tolerance and respect. Conversely, visiting faculty reported that they faced challenges related to language barriers, interaction with native speakers, classroom management, lack of support from school administrators, and separation from family.

Assessment in American Higher Education: The Role of Admissions Tests

2019 ◽  
Vol 683 (1) ◽  
pp. 130-148 ◽  
Author(s):  
Rebecca Zwick
Keyword(s):  
Higher Education ◽  
United States ◽  
The United States ◽  
College Performance ◽  
Admissions Tests ◽  
Higher Education System ◽  
Wide Range ◽  
Test Optional ◽  
The Impact

In this article, I review the role of college admissions tests in the United States and consider the fairness issues surrounding their use. The two main tests are the SAT, first administered in 1926, and the ACT, first given in 1959. Scores on these tests have been shown to contribute to the prediction of college performance, but their role in the admissions process varies widely across colleges. Although test scores are consistently listed as one of the most important admissions factors in national surveys of postsecondary institutions, an increasing number of schools have adopted “test-optional” policies. At these institutions, test score requirements are seen as a barrier to campus diversity because of the large performance gaps among ethnic and socioeconomic groups. Fortunately, the decentralized higher education system in the United States can accommodate a wide range of admissions policies. It is essential, however, that the impact of admissions policy changes be studied and that the resource implications of these changes be thoroughly considered.

Men, Women and the Dynamics of Presidential Approval

2004 ◽  
Vol 35 (1) ◽  
pp. 31-51 ◽  
Author(s):  
HAROLD D. CLARKE ◽  
MARIANNE C. STEWART ◽  
MIKE AULT ◽  
EUEL ELLIOTT
Keyword(s):  
Gender Differences ◽  
Gender Gap ◽  
Evaluation Model ◽  
The United States ◽  
Economic Evaluations ◽  
Parameter Estimates ◽  
Presidential Approval ◽  
Presidential Transitions ◽  
Economic Evaluation Model ◽  
The Impact

Although commentary on the ‘gender gap’ is a staple of political discourse in the United States, most analyses of the dynamics of presidential approval have ignored possible gender differences in the forces driving approval ratings of US presidents. This article analyses gender differences in the impact of economic evaluations and political interventions on the dynamics of presidential approval between 1978 and 1997. The analyses are made possible by disaggregating 240 monthly Survey of Consumers datasets gathered over this period. These data show that women's economic evaluations are consistently more pessimistic than men's, regardless of who occupied the Oval Office. Analyses of rival presidential approval models reveal that a national prospective economic evaluation model performs best for women, but a personal prospective model works best for men. Parameter estimates indicate that economic evaluations accounted for substantial proportions of gender differences in presidential approval in the post-Carter era. Men and women also reacted differently to presidential transitions, with approval increasing more among men when Reagan replaced Carter, and more among women when Clinton replaced Bush. The hypothesis that men are more susceptible than women to rally effects induced by domestic and international crises and wars does not receive consistent support.

Computational Techniques Used in the Driver Performance Model of the Interactive Highway Safety Design Model

2001 ◽  
Vol 1779 (1) ◽  
pp. 17-25 ◽  
Author(s):  
William H. Levison ◽  
Ozgur Simsek ◽  
Alvah C. Bittner ◽  
Steven J. Hunn
Keyword(s):  
Computer Aided Design ◽  
Driving Simulator ◽  
Research Area ◽  
Highway Safety ◽  
Performance Model ◽  
Design Model ◽  
Computational Techniques ◽  
Design Environment ◽  
Driver Performance ◽  
Safety Design

The Interactive Highway Safety Design Model (IHSDM) is a high-priority research area for FHWA. IHSDM is a software system for evaluating the safety of alternative highway designs in a computer-aided design environment. The initial phase of this research program is to develop IHSDM for use in the design of two-lane rural highways. IHSDM includes a driver-vehicle module that simulates the moment-to-moment actions of a single driver-vehicle unit. Reviewed are the computational approaches that have guided the implementation of the driver performance model (DPM) that along with a vehicle model and other components constitute the driver-vehicle module. Five major computational functions of DPM are reviewed: perception, speed decision, path decision, speed control, and path control. Comparison of model results with data from a driving simulator demonstrates the ability of DPM to account for the horizontal curve deflection angle on the speed profile.

scholarly journals Good practice for guidance development – review of consensus methods

2019 ◽  
Vol 17 (4) ◽  
pp. 217-229
Author(s):  
Jacek Siwiec ◽  
Magdalena Konieczna ◽  
Magdalena Koperny
Keyword(s):  
Clinical Practice ◽  
Formal Methods ◽  
Scientific Evidence ◽  
Methodological Approach ◽  
Good Practice ◽  
Consensus Conference ◽  
Nominal Group ◽  
Consensus Methods ◽  
Wide Range ◽  
The Impact

Introduction. The process of synthesizing scientific evidence and translating elaborate scientific research findings into recommendations for clinical practice is one of the most complex and significant initiatives in health care. In connection with the increasing number of recommendations, previously unformalised elements such as the process of consensus decision-making require developing a methodological approach. The use of consensus methods serves to reduce the impact of psychosocial factors in the formulation of recommendations and to increase the degree of process transparency. The aim of the publication is to present formal methods of achieving consensus used in the process of developing clinical practice guidelines. Materials and methods. The review focuses on results of reports analyzing the procedure and methods of developing clinical recommendations, with particular emphasis on the identification of consensus methods. Results. Many international and national organizations and institutions develop recommendations or adapt guidelines developed by others. They use both informal and formal instruments to deal with divergent expert opinions. The most popular formal methods of achieving consensus identified in the review are the Delphi method, the nominal group technique, the RAND/UCLA method, the consensus conference, and the combinations of individual approaches. Formal methods have been shown to lead to less biased and more reliable recommendations. Regardless of the method used, the guidelines should clearly define the quorum and document the process of agreeing a common standpoint on recommendations, guidelines and recommendations. Conclusions. Clinical guidelines have become an important tool influencing clinical practice. The participation of many experts representing the opinions and interests of different groups makes it necessary to apply a methodological and structured approach so that all participants have the opportunity to voice their opinion and to ensure process transparency, deal with misunderstandings and achieve a consensual position. The consensus methods allow to provide a wide range of stakeholders clinicians, policy makers, patients – with agreed rules of conduct in a given topic. The formal consensus methods and recommendations based on these methods combine scientific evidence with the practice and experience of experts.

scholarly journals EPCOT theme park as a science communication space: the Test Track case

2019 ◽  
Vol 18 (04) ◽  
pp. A09
Author(s):  
Daniela Martin
Keyword(s):  
Science Communication ◽  
Methodological Approach ◽  
The United States ◽  
Theme Park ◽  
Narrative Strategies ◽  
Test Track ◽  
Political Interests ◽  
The Future ◽  
Communication Space ◽  
The Impact

Science and technology have become tools to legitimize messages that affect the world in terms of society, politics and economy. This paper presents part of the results of a study that analyzed the symbolic construction of the future in the scientific-technological discourse at EPCOT theme park in Orlando, Florida. The sociohistorical conditions and narrative strategies are analyzed based on the theoretical and methodological approach by John B. Thompson. The results highlighted that the construction of the notion of progress is strongly influenced by the commercial and political interests of the sponsors. In particular, the ‘Test Track’ ride totally lacks any discussion about the impact of cars on society and the environment. The future is presented as a utopian one without any possible disruption, a perception that permeated the development of the United States over the 20th century and is promoted even in the 21st century despite the evidence provided by multiple wars and crises.

scholarly journals Current Practices of Suicide Risk Management Protocols in Research

Crisis ◽  
2010 ◽  
Vol 31 (1) ◽  
pp. 7-11 ◽  
Author(s):  
Steven Vannoy ◽  
Ursula Whiteside ◽  
Jürgen Unützer
Keyword(s):  
Mental Health ◽  
United States ◽  
Risk Management ◽  
Suicide Risk ◽  
Qualitative Methodology ◽  
Descriptive Analysis ◽  
The United States ◽  
Convenience Sample ◽  
Wide Range ◽  
The Impact

Background: Participant safety is an important concern in mental-health-oriented research. Investigators conducting studies in the United States that include potentially suicidal individuals are often required to develop written suicide risk management (SRM) protocols. But little is known about these protocols. It is possible that such protocols could serve as templates for suicide risk management in clinical settings. Aims: To elucidate common (best) practices from mental health intervention researchers. Methods: We conducted a systematic descriptive analysis of written SRM protocols. A convenience sample of studies funded by the United States’ National Institute of Mental Health in 2005 were scanned to discover projects in which investigators were likely to identify and take responsibility for suicide risk in their participant pool. Qualitative methodology was used to create a checklist of tasks perceived to be operationally significant for insuring the safety of suicidal participants. The checklist was applied to all protocols to determine the variability of patient safety tasks across protocols. Results: We identified 45 candidate studies, whereof 38 investigators were contacted, resulting in the review of 21 SRM protocols. Three main categories emerged: overview, entry/exit, and process. Overall, 19 specific tasks were identified. Task frequency varied from 7% to 95% across protocols. Conclusions: The SRM checklist provides a framework for comparing the content of SRM protocols. This checklist may assist in developing SRM protocols in a wide range of settings. Developing guidelines and standard methodologies is an important step to further development of suicide prevention strategies. More research is necessary to determine the impact of SRM protocols on participant safety.

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