4,415 research outputs found
Nonstatistical Factors Influencing Predictions of Financial Distress and Managerial Implications in the All-Cargo Airline Industry
All-cargo airlines carry over 50% of global airfreight, yet they are prone to bankruptcy. Many financial models are designed to predict a firms\u27 financial health, but they do not assess many nonstatistical factors that influence the prediction capability of these models. In this study, qualitative grounded theory design was used to identify nonstatistical factors and explore how they influence bankruptcy prediction models in the all-cargo airline industry. In the first phase of the study, financial data from 2005 to 2009 for 17 all-cargo U.S. airlines were used to determine the bankruptcy prediction ability of the Kroeze financial bankruptcy model. A sample of six all-cargo airlines (ABX Air, Arrow Air, Atlas Air, Cargo 360, Gemini Air Cargo, and Kitty Hawk Air Cargo) were selected containing a mixture of airlines for which the Kroeze model correctly and incorrectly predicted bankruptcy. The sample was used as the starting point to explore the nonstatistical factors using grounded theory. Data were obtained on the six airlines from company annual reports, SEC 10K annual reports, reports from professional journals such as Air Transport Intelligence and Traffic World, news reports and company press releases. The data were coded and grouped into conceptual categories, which were used in theory generation to support the emerging theory. Six categories (management, risk, operations, competitive advantage, financial, and external factors) that relate to the financial stability of an all-cargo airline emerged during the research. Three themes emerged that may improve current quantitative bankruptcy prediction models. The three themes are airline fleet type, type of aircraft flown, and aircraft utilization. The three themes relate to the type, use, and make up of an airline’s fleet. These themes influence bankruptcy prediction model and should be incorporated into failure prediction models to improve their overall accuracy. Future research should be conducted to verify these findings on a larger population, such as all-cargo airlines that operate outside the United States. These airlines operate under different financial regimes that may affect the prediction models differently
The 6th mode of transportation
The five modes of freight transportation are normally characterized as motor carriers, railroads, airlines, water carriers, and pipelines. This paper will attempt to position the Internet as the sixth mode of transportation. This paper compares the strengths and weaknesses of the traditional five modes of transportation against the proposed 6th mode of the Internet. Without including the Internet as a mode of transportation, and tracking the economic value that it adds to the economy, the economic impact of the Internet as a mode is not considered. The recommendation of this study is that the Internet should be added to the list of modes of transportation of goods and therefore making the Internet the sixth mode of transportation
Simulated three-component granular segregation in a rotating drum
Discrete particle simulations are used to model segregation in granular
mixtures of three different particle species in a horizontal rotating drum.
Axial band formation is observed, with medium-size particles tending to be
located between alternating bands of big and small particles. Partial radial
segregation also appears; it precedes the axial segregation and is
characterized by an inner core region richer in small particles. Axial bands
are seen to merge during the long simulation runs, leading to a coarsening of
the band pattern; the relocation of particles involved in one such merging
event is examined. Overall, the behavior is similar to experiment and
represents a generalization of what occurs in the simpler two-component
mixture.Comment: 7 pages, 11 figures (low resolution color figures only; originals at
author's website http://www.ph.biu.ac.il/~rapaport/research/granular.html)
[revised version contains extra figures
Application of heuristic satellite plan synthesis algorithms to requirements of the WARC-88 allotment plan
Creation of an Allotment Plan for the Fixed Satellite Service at the 1988 Space World Administrative Radio Conference (WARC) represented a complex satellite plan synthesis problem, involving a large number of planned and existing systems. Solutions to this problem at WARC-88 required the use of both automated and manual procedures to develop an acceptable set of system positions. Development of an Allotment Plan may also be attempted through solution of an optimization problem, known as the Satellite Location Problem (SLP). Three automated heuristic procedures, developed specifically to solve SLP, are presented. The heuristics are then applied to two specific WARC-88 scenarios. Solutions resulting from the fully automated heuristics are then compared with solutions obtained at WARC-88 through a combination of both automated and manual planning efforts
Pilot’s Style of Learning and Thinking and Age-Related Declines in Visual Recall
This study examined the styles of learning and thinking and age-related visual recall performance of pilots. The study used the Style of Learning and Thinking (SOLAT) survey instrument to determine pilot\u27s learning preferences and compared pilot learning patterns to a control group of non-pilots. The study also examined possible decline in visual recall performance of pilots using a neuropsychological test, the Rey-Osterreich Complex Figure test (ROCF). Decline in visual recall performance of pilots can affect flight safety. There were 130 military pilots, 35 commercial aviation pilots, 26 general aviation pilots, and 57 non-pilot controls in the study
SPACE CARGO: Ultra-fast Delivery on Earth –Potential of Using Suborbital Space Vehicles for the Transportation of Cargo
Analysis of Hazardous Material Incidents Reported to the Aviation Safety Reporting System
Hazardous and dangerous goods are often shipped by air on both passenger and cargo aircraft. These hazardous materials (HAZMAT), also known as dangerous goods (DG), pose a danger to flight safety, passengers, and airline personnel. This research explored how effective the Aviation Safety Reporting System (ASRS) is at identifying aviation related HAZMAT incidents. Early identification of HAZMAT trends using the ASRS data could lead to changes in aviation safety monitoring and reduce the likelihood of a HAZMAT event causing an incident. This study identified prevalent categories of hazardous material found in reported incidents. The study further identified that most of the HAZMAT incidents involved cargo being flown on passenger aircraft and that two-thirds of the incidents were discovered after take-off. Missing or incorrect documentation was identified in approximately half of the cases. Statistical analysis of the data indicated that HAZMAT paperwork errors correlated significantly with damage to an aircraft and that the source of the problem (passenger carry on, passenger checked, cargo) correlated significantly with where (climb-out, landing, ground, cruise) the problems occurred
Book Review - Gender in Physical Culture: Crossing Boundaries-Reconstituting Cultures
Scholars in sport, physical activity, and physical education have recently articulated the need for appreciative inquiries into the deconstruction and denaturalisation of gender because such work is integral for gender-inclusive spaces in physical culture. Thus, ‘Gender in Physical Culture: Crossing Boundaries-Reconstituting Cultures’ fills an noteworthy gap in research by detailing widely accepted social and cultural norms before problematising discourses where boundaries can be crossed. The authors are honest, reflexive, critical, engaging activists in gender-inclusive work and through this book successfully share insights into boundary-crossing in the space of physical culture. Altogether, this book proves to be a highly insightful and thought-provoking read
Analysis of General Aviation Instructional Loss of Control Accidents
Although student pilots spend many hours practicing maneuvers to improve airmanship and prevent accidents, almost one half of all general aviation aircraft accidents occur during flight training. Among these, loss of control is the most commonly cited causal factor, and the most common first occurrence in a chain of causal events. This project answers the following question: Can an analysis of National Transportation Safety Board (NTSB) accident reports identify the role of secondary causal factors or reasons involved in general aviation loss of control accidents that involve instructional flights? The analysis focuses on five factors as they each relate to loss of control events: causal factors, phase and location of flight, student and instructor experience, procedural errors, and meteorological conditions. In addition, common occurrences were analyzed to determine trends involved with accident chains of events, and a chi-square test was completed for student and instructor experience as well as accident locations in order to gather insight and support recommendations regarding instructional loss of control accidents in general aviation. The study revealed at least two significant findings: (1) the number of student flight hours accumulated correlates to accident location; and (2) the chain of events in an accident can be an important piece of information in determining causes of an aircraft accident
Characteristics of Helicopter Accidents Involving Male and Female Pilots
Studies examining aviation accidents have not found differences in accident rates by gender, though there may be gender differences in the types of accident. Baker, Lamb, Grabowski, and Rebok (2001) examined fixed-wing aviation accident rates of male and female private pilots and found that males were more likely to have accidents related to inattention or poor planning while female pilots were more likely to have accidents due to mishandling the aircraft. This research analyzed the National Transportation Safety Board’s aviation accident database system to examine the severity of injury and aircraft damage in rotary-wing (helicopter) accidents by gender. The data indicated that female helicopter pilots have slightly higher accident rates with higher aircraft damage and personnel injury rates at lower levels of training and experience, but have superior records as compared to male pilots at higher levels of experience. Overall, minimal differences in accident rates for helicopter pilots can be tied to gender differences
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