RESEARCHPublicationsConferences PublicationsProceedings of the 9th International Conference RELIABILITY and STATISTICS in TRANSPORTATION and COMMUNICATION (RelStat-09), 21-24 October 2009, Riga, Latvia, ISBN 978-9984-818-00-9
Transport and Telecommunication Institute Lomonosova Str. 1, Riga, LV-1019, Latvia Ph.: +371 29958338. E-mail: Dmitry.Pavlyuk@tsi.lv
This study deals with estimation of European airports’ efficiency values and their interrelation with a level of competition pressure for passengers among airports. In this paper a new adaptive definition of airport’s catchment area is presented. Using this definition we develop an indicator of a level of competition pressure, based on overlapping of airport’s potential catchment areas. A stochastic frontier model to estimate efficiencies of airports is applied. The method includes the construction of a production frontier for a sample of airports and estimation of individual airports’ efficiency values as distances from this frontier. A classic production approach to airport activities where an airport enterprise uses labour resources (a number of employees) and infrastructure (a number of runways, gates, check-ins and parking spaces) for transportation of passengers is discussed. A resampling jack-knife technique to test the reliability of airports’ efficiencies estimates is used as well. A relationship between a level of competition pressure and airports’ operation efficiencies in case of imperfect spatial competition for passengers has been investigated.
Keywords: stochastic frontier, efficiency, airport, spatial competition
Yury Paramonov, Andrey Kuznetsov
1Aviation Institute, Riga Technical University Lomonosova Str. 1, Riga, LV-1019, Latvia Ph.: +371 67255394. Fax: +371 67089990 E-mail: email@example.com, firstname.lastname@example.org
Algorithm of inspection program development and control using theory of Markov chains and p-set function definition on the base of processing of approval lifetime test result is discussed.We make assumption that some Structural Significant Item (SSI), the failure of which is the failure of the whole system, is characterized by a random vector (r.v.) (Td ,Tc ), where Tc is critical lifetime (up to failure), Td is service time, when some damage (fatigue crack) can be detected. We suppose also that a required operational life of the system is limited by so-called Specified Life (SL), t SL, when system is discarded from service. Some examples are given.
Keywords: inspection program, Markov chains, reliabilityDiagnostics Models in Expert Systems of Measuring the Status Condition of the Aicraft Power Plants
Eugene Kopytov, Vladimir Labendik, Sergey Yunusov
Transport and Telecommunication Institute 1 Lomonosov Str., Riga, LV-1019, Latvia Phone: +371 67100590, fax: +371 67100660, E-mail: email@example.com
In the given paper there are considered some types of diagnostics systems: mathematical, stochastic and logical, which could be used in developing expert systems for evaluating the aircraft power plants’ technical state as demonstrated by the engines ТВ-3-117 и PS-90А
Key words: air gas-turbine engine, technical maintenance, control of parameters, automated diagnostics system, expert system, decision-making system, diagnostics matrix
Transport and Telecommunication Institute Lomonosova Str. 1, Riga, LV 1019, Latvia E-mail: firstname.lastname@example.org
Balloons on the extents of great while are successfully used for the scientific researches. Application of balloon gives large possibilities to the researcher. To the terms of autonomous exact enough determination of coordinates regardless of time and distance of flight most full satisfy the correlation extreme system (CES), principle of action of which consists in comparing of measurable intensity of the inuse physical field of Earth to a priori information about this field, kept in a memory. Analysing all variety of the spatial and superficial fields of Earth from point of application in balloon CES, it is foremost necessary to be stopped for the magnetic field of Earth (MFE). This choice is grounded by that MFE it is well enough studied, his maps are made, the methods of count of elements of MFE are developed upwards. On a balloon as signals of such rough system it is possible to use information about a prognosis trajectory, compliable for every flight, namely prognosis speed and prognosis direction. For the estimation of attainable exactness of co-ordinates determination, there was modelling of the offered variant of CES undertaken at balloon flight at altitude 30 km. Modelling results confirm theoretical suppositions about that, at the increase of number of supervisions, exactness of determination of co-ordinates is increased. In addition, errors in prognostication of speed substantially influence on exactness of coordinates determination. The variant of CES offered on the whole can provide acceptable exactness of autonomous navigation of stratosphere balloons. The purpose of this paper is development and research of algorithm CES, and the magnetic field of Earth is used in the research.
Keywords: balloons, navigation, magnetic field, correlation extreme systems
Transport and Telecommunications Institute Head of IT-Services, DFS, Deutsche Flugsicherung GmbH, Langen Am DFS-Campus 7, D-63225 Langen Ph.: +49 6103 707 2530. Fax +49 6103 707 4596. E-mail: Joerg.Kundler@dfs.de
Business Processes supported by IT Services is one of the mission critical factors of modern Air Traffic Control Providers (ATC). Particularly ATC companies are highly dependent on their technical process know how and to deliver a safe and efficient ATC Services. During research of dissertation by different ATC providers it was observed that no general meta-model for ATC technical services exists. On the base of multidimensional modelling method the approach for modelling and design of a general ATC meta-model in context to ITIL Standard and ISO 20000 standard has been performed. The results of this research have been used for further optimisation and increasing of harmonization of the ATC technical service processes. The focus of research is to develop a universal high level multidimensional model for technical ATC services, because over medium term period it will be essential on the European ATC market to change from a national oriented ATC provider to a global European ATC service provider which is able to support the ATC business on a standard technical service process model. With respect to the Single European Sky program from the European Commission and the activities of different national ATC service provide to create international functional airspace blocks a metaframe or meta multidimensional process model of technical services should be the basis for standardization of ATC technical services and be able to change from a national ATC-provider with their own best practices to a European global ATC provider. An essential prerequisite for globalisation of European ATC market is to develop a global and standardized ATC process model. Based on the developed ATC meta-model technical services can be designed and described by dimension tables, information cubes. The ATC meta-model is to be the basis of high level description by scientific methods and can be used as input information for the specific ATC process management and monitoring. The goal of meta frame model by multidimensional modelling is to investigate into standardization of ATC technical process landscape, to design specific key performance parameter for evaluation and benchmarking and to derive technical expertise for a migration of own specific technical processes to a general standardized meta process model of AIS Services. For that reason the research presents different number of data/information cubes and dimensional tables. The main result of the research is the developed Meta ATC Process model.
Keywords: Multidimensional modelling, Modules of metaframe, Questionnaire and Dimension tables, ATC modelling cubes, Metric Controlled Meta Model Cubes
Transport and Telecommunication Institute Lomonosova Str. 1, Riga, LV-1019, Latvia E-mail: email@example.com
Anomalous magnetic field of Earth (AMFE) it is well enough studied, there are maps, made from data of surface, marine and air surveys. There are air magnetometer, intended for measuring of the magnetic field aboard aircrafts (Ferro probe, proton, and quantum) and possessing good static and dynamic properties . At the same time AMFE in north regions higher 60° north latitude has specific features. The first feature consists in that – on this territory located both north part of the Eurasian continent and adjoining to it exterminating the Arctic Ocean. Each of these regions possesses the characteristic structure of AMFE. The second feature is – in high breadths most intensive and most credible to variation (indignations) of AMFE. The purpose of this article is to research and analyse the statistical descriptions of AMFE in high geographical latitudes.
Keywords: magnetic field, high latitudes, statistical descriptions