NASA Scientific and Technical Aerospace Reports

which uses the World Wide Web and other popular Internet-based information systems as search engines. The NTRS is an
inter-center effort which provides uniform access to various distributed publication servers residing on the Internet. Users have
immediate desktop access to technical publications from NASA centers and institutes. The NTRS is comprised of several
units, some constructed especially for inclusion in NTRS, and others that are existing NASA publication services that NTRS
reuses. This paper presents the NTRS architecture, usage metrics, and the lessons learned while implementing and maintaining
the service. The NTRS is largely constructed with freely available software running on existing hardware. NTRS builds upon
existing hardware and software, and the resulting additional exposure for the body of literature contained ensures that NASA’s
institutional knowledge base will continue to receive the widest practicable and appropriate dissemination.
Author
Computer Programs; Congressional Reports; Information Retrieval
Includes cost effectiveness studies.
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ECONOMICS AND COST ANALYSIS
20040111206 Technische Hogeschool, Delft, Netherlands
An Application of the Methodology for Assessment of the Sustainability of Air Transport System
Janic, Milan; The Conference Proceedings of the 2003 Air Transport Research Society (ATRS) World Conference; July 2003;
Volume 5; 33 pp.; In English; See also 20040111201; Copyright; Avail: CASI; A03, Hardcopy
An assessment and operationalization of the concept of sustainable air transport system is recognized as an important but
complex research, operational and policy task. In the scope of the academic efforts to properly address the problem, this paper
aims to assess the sustainability of air transport system. It particular, the paper describes the methodology for assessment of
sustainability and its potential application. The methodology consists of the indicator systems, which relate to the air transport
system operational, economic, social and environmental dimension of performance. The particular indicator systems are
relevant for the particular actors such users (air travelers), air transport operators, aerospace manufacturers, local communities,
governmental authorities at different levels (local, national, international), international air transport associations, pressure
groups and public. In the scope of application of the methodology, the specific cases are selected to estimate the particular
indicators, and thus to assess the system sustainability under given conditions.
Author
Air Transportation; Operations Research; Assessments; Environment Effects; Airline Operations
20040111208 Ecole Nationale de l’Aviation Civile, Toulouse, France
A Fuzzy Approach of the Competition on Air Transport Market
Charfeddine, Souhir; DeColigny, Marc; Camino, Felix Mora; Cosenza, Carlos Alberto Nunes; The Conference Proceedings
of the 2003 Air Transport Research Society (ATRS) World Conference; July 2003; Volume 5; 14 pp.; In English; See also
20040111201; Copyright; Avail: CASI; A03, Hardcopy
The aim of this communication is to study with a new scope the conditions of the equilibrium in an air transport market
where two competitive airlines are operating. Each airline is supposed to adopt a strategy maximizing its profit while its
estimation of the demand has a fuzzy nature. This leads each company to optimize a program of its proposed services
(frequency of the flights and ticket prices) characterized by some fuzzy parameters. The case of monopoly is being taken as
a benchmark. Classical convex optimization can be used to solve this decision problem. This approach provides the airline
with a new decision tool where uncertainty can be taken into account explicitly. The confrontation of the strategies of the
companies, in the case of duopoly, leads to the definition of a fuzzy equilibrium. This concept of fuzzy equilibrium is more
general and can be applied to several other domains. The formulation of the optimization problem and the methodological
consideration adopted for its resolution are presented in their general theoretical aspect. In the case of air transportation, where
the conditions of management of operations are critical, this approach should offer to the manager elements needed to the
consolidation of its decisions depending on the circumstances (ordinary, exceptional events,..) and to be prepared to face all
possibilities.
Author
Fuzzy Systems; Competition; Economic Analysis; Airline Operations
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