Lance Sherry | George Mason University (original) (raw)
Papers by Lance Sherry
Wiley Encyclopedia of Electrical and Electronics Engineering, 2015
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15th AIAA Aviation Technology, Integration, and Operations Conference, 2015
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2014 IEEE/AIAA 33rd Digital Avionics Systems Conference (DASC), 2014
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INCOSE International Symposium, 1995
ABSTRACT
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NEXTOR Draft Final …, 2010
Executive Summary Flight delay is a serious and widespread problem in the United States. Increasi... more Executive Summary Flight delay is a serious and widespread problem in the United States. Increasing flight delays place a significant strain on the US air travel system and cost airlines, passengers, and society at many billions of dollars each year. While a number of previous studies have attempted to estimate the total economic impact of delays, scientific knowledge about the cost of delay is still limited. The Federal Aviation Administration sponsored the five NEXTOR universities and the Brattle Group to conduct a ...
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ABSTRACT It has been the practice of the majority of airlines to reschedule passengers and flight... more ABSTRACT It has been the practice of the majority of airlines to reschedule passengers and flights so as to minimize flight delay. Some airlines are now starting to look at the problem of rescheduling from the perspective of the passenger and are trying to minimize the impact of missed and cancelled connecting flights on the consumer. In this paper we propose the algorithm Basic Reduction Yare Approach for fliGHts, BRYAGH for minimizing airline passenger trip delay. Though BRYAGH is a first step in developing an algorithm for decreasing passenger trip delay, we demonstrate improvement in passenger delay.
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2010 Integrated Communications, Navigation, and Surveillance Conference Proceedings, 2010
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ABSTRACT
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Transportation Research Part C: Emerging Technologies, 2010
ABSTRACT The discrepancy between the projected demand for arrival slots at an airport and the pro... more ABSTRACT The discrepancy between the projected demand for arrival slots at an airport and the projected available arrival slots on a given day is resolved by the Ground Delay Program (GDP). The current GDP rationing rule, Ration-by-Schedule, allocates the available arrival slots at the affected airport by scheduled arrival time of the flights with some adjustments to balance the equity between airlines. This rule does not take into account passenger flow and fuel flow performance in the rationing assignment tradeoff.This paper examines the trade-off between passenger delays and excess surface fuel burn as well as airline equity and passenger equity in GDP slot allocation using different rationing rules. A GDP Rationing Rule Simulator (GDP-RRS) is developed to calculate performance and equity metrics for all stakeholders using six alternate rules. The results show that there is a trade-off between GDP performance and GDP equity. Ration-by-Passengers (a rule which maximizes the passenger throughput) decreased total passenger delay by 22% and decreased total excess fuel burn by 57% with no change in total flight delay compared to the traditional Ration-by-Schedule. However, when the airline and passenger equity are primary concerns, the Ration-by-Schedule is preferred.
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ABSTRACT The Flight Management Computer (FMC) and its interface, the Multi-function Control and D... more ABSTRACT The Flight Management Computer (FMC) and its interface, the Multi-function Control and Display Unit (MCDU) have been identified by researchers and airlines as difficult to train and use. Specifically, airline pilots have described the "drinking from the fire-hose" effect during training. Previous research has identified memorized action sequences as a major factor in a user s ability to learn and operate complex devices. This paper discusses the use of a method to examine the quantity of memorized action sequences required to perform a sample of 102 tasks, using features of the Boeing 777 Flight Management Computer Interface. The analysis identified a large number of memorized action sequences that must be learned during training and then recalled during line operations. Seventy-five percent of the tasks examined require recall of at least one memorized action sequence. Forty-five percent of the tasks require recall of a memorized action sequence and occur infrequently. The large number of memorized action sequences may provide an explanation for the difficulties in training and usage of the automation. Based on these findings, implications for training and the design of new user-interfaces are discussed.
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Gateway to the New Millennium. 18th Digital Avionics Systems Conference. Proceedings (Cat. No.99CH37033), 1999
The behavior of a modern autopilot is governed by a set of rules. Several researchers have demons... more The behavior of a modern autopilot is governed by a set of rules. Several researchers have demonstrated that pilots have gaps in their knowledge of these rules and have difficulty explaining and predicting the behavior of the autopilot. Apart from the absence of training and cockpit annunciations, natural cognitive mechanisms cause pilots to forget (due to infrequent use) and simplify
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Wiley Encyclopedia of Electrical and Electronics Engineering, 2015
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15th AIAA Aviation Technology, Integration, and Operations Conference, 2015
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2014 IEEE/AIAA 33rd Digital Avionics Systems Conference (DASC), 2014
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INCOSE International Symposium, 1995
ABSTRACT
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NEXTOR Draft Final …, 2010
Executive Summary Flight delay is a serious and widespread problem in the United States. Increasi... more Executive Summary Flight delay is a serious and widespread problem in the United States. Increasing flight delays place a significant strain on the US air travel system and cost airlines, passengers, and society at many billions of dollars each year. While a number of previous studies have attempted to estimate the total economic impact of delays, scientific knowledge about the cost of delay is still limited. The Federal Aviation Administration sponsored the five NEXTOR universities and the Brattle Group to conduct a ...
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ABSTRACT It has been the practice of the majority of airlines to reschedule passengers and flight... more ABSTRACT It has been the practice of the majority of airlines to reschedule passengers and flights so as to minimize flight delay. Some airlines are now starting to look at the problem of rescheduling from the perspective of the passenger and are trying to minimize the impact of missed and cancelled connecting flights on the consumer. In this paper we propose the algorithm Basic Reduction Yare Approach for fliGHts, BRYAGH for minimizing airline passenger trip delay. Though BRYAGH is a first step in developing an algorithm for decreasing passenger trip delay, we demonstrate improvement in passenger delay.
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2010 Integrated Communications, Navigation, and Surveillance Conference Proceedings, 2010
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ABSTRACT
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Transportation Research Part C: Emerging Technologies, 2010
ABSTRACT The discrepancy between the projected demand for arrival slots at an airport and the pro... more ABSTRACT The discrepancy between the projected demand for arrival slots at an airport and the projected available arrival slots on a given day is resolved by the Ground Delay Program (GDP). The current GDP rationing rule, Ration-by-Schedule, allocates the available arrival slots at the affected airport by scheduled arrival time of the flights with some adjustments to balance the equity between airlines. This rule does not take into account passenger flow and fuel flow performance in the rationing assignment tradeoff.This paper examines the trade-off between passenger delays and excess surface fuel burn as well as airline equity and passenger equity in GDP slot allocation using different rationing rules. A GDP Rationing Rule Simulator (GDP-RRS) is developed to calculate performance and equity metrics for all stakeholders using six alternate rules. The results show that there is a trade-off between GDP performance and GDP equity. Ration-by-Passengers (a rule which maximizes the passenger throughput) decreased total passenger delay by 22% and decreased total excess fuel burn by 57% with no change in total flight delay compared to the traditional Ration-by-Schedule. However, when the airline and passenger equity are primary concerns, the Ration-by-Schedule is preferred.
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ABSTRACT The Flight Management Computer (FMC) and its interface, the Multi-function Control and D... more ABSTRACT The Flight Management Computer (FMC) and its interface, the Multi-function Control and Display Unit (MCDU) have been identified by researchers and airlines as difficult to train and use. Specifically, airline pilots have described the "drinking from the fire-hose" effect during training. Previous research has identified memorized action sequences as a major factor in a user s ability to learn and operate complex devices. This paper discusses the use of a method to examine the quantity of memorized action sequences required to perform a sample of 102 tasks, using features of the Boeing 777 Flight Management Computer Interface. The analysis identified a large number of memorized action sequences that must be learned during training and then recalled during line operations. Seventy-five percent of the tasks examined require recall of at least one memorized action sequence. Forty-five percent of the tasks require recall of a memorized action sequence and occur infrequently. The large number of memorized action sequences may provide an explanation for the difficulties in training and usage of the automation. Based on these findings, implications for training and the design of new user-interfaces are discussed.
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Gateway to the New Millennium. 18th Digital Avionics Systems Conference. Proceedings (Cat. No.99CH37033), 1999
The behavior of a modern autopilot is governed by a set of rules. Several researchers have demons... more The behavior of a modern autopilot is governed by a set of rules. Several researchers have demonstrated that pilots have gaps in their knowledge of these rules and have difficulty explaining and predicting the behavior of the autopilot. Apart from the absence of training and cockpit annunciations, natural cognitive mechanisms cause pilots to forget (due to infrequent use) and simplify
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