ngoe ndoh - Academia.edu (original) (raw)

Papers by ngoe ndoh

The aim of the research described in this report is to investigate the improvements required to i... more The aim of the research described in this report is to investigate the improvements required to influence a switch in travel mode. The report examines the problem of data acquisition and the need for an appropriate system for collecting data, A generic survey system is proposed which can readily provide the relevant data for modelling to answer questions on mode choice and mode switching. The proposed integrated but flexible system is based on state of the art developments in survey methods and the use of portable personal computers. Methods of developing the system are also discussed. Policy options are investigated and the relevant variables are identified. The survey structure is described and a configuration is given for access evaluation. An example of the survey questionnaire and a working paper describing a stated preference pilot study on airport access mode choice evaluation, are included in appendices.

Environment and Planning A, 1995

Establishing the extent to which the level of transport supply affects demand generation remains ... more Establishing the extent to which the level of transport supply affects demand generation remains a daunting problem for the transport analyst because of reciprocal causation and dependency between supply and demand. After the US deregulation of domestic air transport, unprecedented increases in air-service supply were observed at many US airports, increases which can be considered to be clearly independent of local service requirements. The supply measures reflect improvements in service both to nearby major airports and to the United States as a whole. In this paper, a sample of three airports is examined in an attempt to establish causal relationships between local demand and several measures of air-transport supply. Causality is established by using cross-correlation-function analysis, and the impacts of supply on demand are determined by using time-series transfer-function modelling. Causality is found to be location dependent, but supply tends to affect demand with a 3–6–month ...

Transportation Research Record, 1993

International Journal of Geosciences, 2019

Geoelectric data obtained from forty (40) vertical electrical soundings collected with a Schlumbe... more Geoelectric data obtained from forty (40) vertical electrical soundings collected with a Schlumberger device in the Adamawa plateau region, also known as the Cameroon water tower, have been treated by the least-squares inversion method. In order to study the nature and thickness of the aquifer and the necessary geoelectric parameters, quantitative and qualitative interpretations of the data were made. The results obtained showed that: about four to five geoelectric layers have been delimited in the study area with a dominance of the KH curve, which can be used as a reference for future studies. The first two layers constitute an association of clay and laterite with resistivity values ranging from 58 to 9122 Ω•m and whose thickness is between 0.6 and 13.4 m. The third layer is a potentially aquiferous laterite composed of clay, laterite and especially clay sand and cracked/good granite, with a dominance of sandy alteration whose resistivity values are between 81 and 960 Ω•m and its thickness between 12.2 and 26.8 m. The fourth and fifth layers are made up of cracked/good granite with a resistivity ranging from 12-10705 Ω•m with an average value of 1817 Ω•m. This study also shows that the NorthEast , SouthWest and South sectors could be the groundwater convergence zones and that the average depth of the basement aquifer roof is about 28.3 m. The geoelectric sections of certain demarcated vertical electrical sounding stations are consistent with the geologic description of the area.

Access to airports has traditionally been road based and there are clear indications that the tax... more Access to airports has traditionally been road based and there are clear indications that the taxi and the private car will continue to dominate as the primary surface access modes. Research into level of service concepts indicates that it will be very difficult, if not impossible, to bring public transport access modes up to a perceived equal and therefore competing level of service. Modal shifts of very significant proportions are conceivable only if the road based private modes are debased in service levels by very large increases in costs, congestion or other penalties which could be considered disutilities. The paper will report on level of service studies carried out at Loughborough on Heathrow Airport access modes which permit discriminant scaling and stated preference work which shows a lack of elasticity in modal choice with respect to four major variables of choice. (A) For the covering abstract see IRRD 865038.

Spatial Choices and Processes, 1990

Transportation Planning and Technology, 1995

... Department of Aeronautical & Automotive Engineering and Transport Studies, Loughborough U... more ... Department of Aeronautical & Automotive Engineering and Transport Studies, Loughborough University of Technology ... similar reasoning pattern takes place in the case of a new airport, or terminal. By examining current and/or predicted traffic patterns a basic concept design can ...

Transportation Research Record, 1996

The aviation industry is experiencing intense interest in the safety of handling operations at ai... more The aviation industry is experiencing intense interest in the safety of handling operations at airports. This is because of the level of risk exposure identified in this area, the exposure of expensive aircraft to such high levels of risk, and the increasingly high cost of ramp accidents. The costs to the industry are becoming unacceptable; a global estimate has been made by Boeing of $2 billion per year to airlines. To minimize these costs and control the level of ramp accidents, an overall ramp safety management system approach is required that involves risk analysis and risk management. Risk analysis involves establishing the organization's risk profile, and risk management encompasses the various measures that can be implemented to minimize accidents, control loss, and transfer risk by insurance on the basis of the identified risk profile of an organization. A systems approach to ground handling risk analysis and a description of a spreadsheet-based model developed at Lough-borough University for ramp risk management within an organization, such as an airport, airline, or ground handling agent, are presented. The work has been carried out in response to the demonstrated need of industry to control in a systematic manner rapidly rising ramp accident costs that are currently almost universally treated as an unavoidable cost marginal to the core business.

The aim of the research described in this report is to investigate the improvements required to i... more The aim of the research described in this report is to investigate the improvements required to influence a switch in travel mode. The report examines the problem of data acquisition and the need for an appropriate system for collecting data, A generic survey system is proposed which can readily provide the relevant data for modelling to answer questions on mode choice and mode switching. The proposed integrated but flexible system is based on state of the art developments in survey methods and the use of portable personal computers. Methods of developing the system are also discussed. Policy options are investigated and the relevant variables are identified. The survey structure is described and a configuration is given for access evaluation. An example of the survey questionnaire and a working paper describing a stated preference pilot study on airport access mode choice evaluation, are included in appendices.

Environment and Planning A, 1995

Establishing the extent to which the level of transport supply affects demand generation remains ... more Establishing the extent to which the level of transport supply affects demand generation remains a daunting problem for the transport analyst because of reciprocal causation and dependency between supply and demand. After the US deregulation of domestic air transport, unprecedented increases in air-service supply were observed at many US airports, increases which can be considered to be clearly independent of local service requirements. The supply measures reflect improvements in service both to nearby major airports and to the United States as a whole. In this paper, a sample of three airports is examined in an attempt to establish causal relationships between local demand and several measures of air-transport supply. Causality is established by using cross-correlation-function analysis, and the impacts of supply on demand are determined by using time-series transfer-function modelling. Causality is found to be location dependent, but supply tends to affect demand with a 3–6–month ...

Transportation Research Record, 1993

International Journal of Geosciences, 2019

Geoelectric data obtained from forty (40) vertical electrical soundings collected with a Schlumbe... more Geoelectric data obtained from forty (40) vertical electrical soundings collected with a Schlumberger device in the Adamawa plateau region, also known as the Cameroon water tower, have been treated by the least-squares inversion method. In order to study the nature and thickness of the aquifer and the necessary geoelectric parameters, quantitative and qualitative interpretations of the data were made. The results obtained showed that: about four to five geoelectric layers have been delimited in the study area with a dominance of the KH curve, which can be used as a reference for future studies. The first two layers constitute an association of clay and laterite with resistivity values ranging from 58 to 9122 Ω•m and whose thickness is between 0.6 and 13.4 m. The third layer is a potentially aquiferous laterite composed of clay, laterite and especially clay sand and cracked/good granite, with a dominance of sandy alteration whose resistivity values are between 81 and 960 Ω•m and its thickness between 12.2 and 26.8 m. The fourth and fifth layers are made up of cracked/good granite with a resistivity ranging from 12-10705 Ω•m with an average value of 1817 Ω•m. This study also shows that the NorthEast , SouthWest and South sectors could be the groundwater convergence zones and that the average depth of the basement aquifer roof is about 28.3 m. The geoelectric sections of certain demarcated vertical electrical sounding stations are consistent with the geologic description of the area.

Access to airports has traditionally been road based and there are clear indications that the tax... more Access to airports has traditionally been road based and there are clear indications that the taxi and the private car will continue to dominate as the primary surface access modes. Research into level of service concepts indicates that it will be very difficult, if not impossible, to bring public transport access modes up to a perceived equal and therefore competing level of service. Modal shifts of very significant proportions are conceivable only if the road based private modes are debased in service levels by very large increases in costs, congestion or other penalties which could be considered disutilities. The paper will report on level of service studies carried out at Loughborough on Heathrow Airport access modes which permit discriminant scaling and stated preference work which shows a lack of elasticity in modal choice with respect to four major variables of choice. (A) For the covering abstract see IRRD 865038.

Spatial Choices and Processes, 1990

Transportation Planning and Technology, 1995

... Department of Aeronautical & Automotive Engineering and Transport Studies, Loughborough U... more ... Department of Aeronautical & Automotive Engineering and Transport Studies, Loughborough University of Technology ... similar reasoning pattern takes place in the case of a new airport, or terminal. By examining current and/or predicted traffic patterns a basic concept design can ...

Transportation Research Record, 1996

The aviation industry is experiencing intense interest in the safety of handling operations at ai... more The aviation industry is experiencing intense interest in the safety of handling operations at airports. This is because of the level of risk exposure identified in this area, the exposure of expensive aircraft to such high levels of risk, and the increasingly high cost of ramp accidents. The costs to the industry are becoming unacceptable; a global estimate has been made by Boeing of $2 billion per year to airlines. To minimize these costs and control the level of ramp accidents, an overall ramp safety management system approach is required that involves risk analysis and risk management. Risk analysis involves establishing the organization's risk profile, and risk management encompasses the various measures that can be implemented to minimize accidents, control loss, and transfer risk by insurance on the basis of the identified risk profile of an organization. A systems approach to ground handling risk analysis and a description of a spreadsheet-based model developed at Lough-borough University for ramp risk management within an organization, such as an airport, airline, or ground handling agent, are presented. The work has been carried out in response to the demonstrated need of industry to control in a systematic manner rapidly rising ramp accident costs that are currently almost universally treated as an unavoidable cost marginal to the core business.