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Multi-view vehicle re-identification (Re-ID) aims to retrieve all images of a target vehicle from a large gallery where the vehicles are captured from non-overlapping cameras. However, the drastic variation in vehicle appearance under different viewpoints greatly affects the performance of the multi-view vehicle Re-ID model, so the key issue in multi-view vehicle Re-ID is learning an effective feature representation that is robust to both dramatic intra-class variability and small inter-class variability. To achieve this goal, we have proposed a multi-center metric learning framework for multi-view vehicle Re-ID. In our approach, we model latent views from vehicle visual appearance directly without any extra labels except ID. Firstly, we introduce several latent view clusters for a vehicle to model latent multi-view information and each view cluster has a learnable center. Then multi-view vehicle matching task can be transformed into two subproblems, cross-view matching and cross-target matching. Finally, an intra-class ranking loss with cross-view center constraint and a cross-class ranking loss with cross-vehicle center constraint are proposed to address the two subproblems, respectively. Extensive experimental evaluations on three widely used benchmarks show the superiority of the proposed framework in contrast to a series of existing state-of-the-arts.
Yi Jin; Chenning Li; Yidong Li; Peixi Peng; George A. Giannopoulos. Model Latent Views With Multi-Center Metric Learning for Vehicle Re-Identification. IEEE Transactions on Intelligent Transportation Systems 2021, 22, 1919 -1931.
AMA StyleYi Jin, Chenning Li, Yidong Li, Peixi Peng, George A. Giannopoulos. Model Latent Views With Multi-Center Metric Learning for Vehicle Re-Identification. IEEE Transactions on Intelligent Transportation Systems. 2021; 22 (3):1919-1931.
Chicago/Turabian StyleYi Jin; Chenning Li; Yidong Li; Peixi Peng; George A. Giannopoulos. 2021. "Model Latent Views With Multi-Center Metric Learning for Vehicle Re-Identification." IEEE Transactions on Intelligent Transportation Systems 22, no. 3: 1919-1931.
This chapter contains a summary of the main issues raised and the findings in this book as regards the current situation and the policies that exist for research and innovation, in general, as well as in the field of Transport more specifically, in the three countries examined i.e. the P.R. China, Japan, and Korea. This summary, is given in a synthetic way that gives considerable “value added” but nevertheless does not replace the detailed data, information and analyses that are given in each respective Chapter. It also explains the rationale for writing this book and the reason for focusing on the public sector, while by no means dismissing the role of the private sector and the public-private collaborations. The focus of the Chapter is on the governmental systems and practices for transport research in the three countries, providing a good overview of the inertias as well as the accelerants for relevant policies with respect to promoting technological change and more international cooperation in the transportation sector. For each of the countries examined the Chapter addresses, in summary form, the policies, the governance structures, the strengths and weaknesses of the current systems of publicly funded transport research; the endogenous and exogenous factors motivating the development of international collaborative relationships between these Asian and other countries; the role of the private sector; and also the core scientific research capabilities and prospects of each of the countries in as much as they affect the transport sector. The capacity and capability of the countries examined, to consistently produce the science necessary to enable significant technological innovation and “transformative” change in the Transport sector, globally over the long term (e.g., in 20 years or more) as well as nationally, is examined through a synthesis of the SWOT analyses that are made in each of the other Chapters. These analyses are focused toward the assessment of the prospects for international cooperation in the transport field for these three countries. The Chapter concludes that if entrepreneurial activity by private interests over the past 5 years, is a valid leading indicator it appears that transportation innovation will be propelled forward globally primarily via private interests and not so much through agreements consummated by government agencies.
George A. Giannopoulos; John F. Munro. The Case for Transport Research Cooperation with China, Japan, Korea—Rationale for This Book and Summary of Its Findings. Advanced Microsystems for Automotive Applications 2016 2017, 1 -29.
AMA StyleGeorge A. Giannopoulos, John F. Munro. The Case for Transport Research Cooperation with China, Japan, Korea—Rationale for This Book and Summary of Its Findings. Advanced Microsystems for Automotive Applications 2016. 2017; ():1-29.
Chicago/Turabian StyleGeorge A. Giannopoulos; John F. Munro. 2017. "The Case for Transport Research Cooperation with China, Japan, Korea—Rationale for This Book and Summary of Its Findings." Advanced Microsystems for Automotive Applications 2016 , no. : 1-29.
George A. Giannopoulos. Know-How Transfer and Training Issues for the Transport Research Professional. International Journal of Transportation Science and Technology 2015, 4, 159 -177.
AMA StyleGeorge A. Giannopoulos. Know-How Transfer and Training Issues for the Transport Research Professional. International Journal of Transportation Science and Technology. 2015; 4 (2):159-177.
Chicago/Turabian StyleGeorge A. Giannopoulos. 2015. "Know-How Transfer and Training Issues for the Transport Research Professional." International Journal of Transportation Science and Technology 4, no. 2: 159-177.
Urban traffic control systems evolved through three generations. The first generation of such systems has been based on historical traffic data. The second generation took advantage of detectors, which enabled the collection of real-time traffic data, in order to re-adjust and select traffic signalization programs. The third generation provides the ability to forecast traffic conditions, in order to have traffic signalization programs and strategies pre-computed and applied at the most appropriate time frame for the optimal control of the current traffic conditions. Nowadays, the fourth generation of traffic control systems is already under development, based among others on principles of artificial intelligence and having capabilities of on-time information provision, traffic forecasting and incident detection is being developed according to principles of large-scale integrated systems engineering. Although these systems are largely benefiting from the developments of various information technology and computer science sectors, it is obvious that their performance is always related to that of the underlying optimization and control methods. Until recently, static traffic assignment (route choice) modes were used in order to forecast future traffic flows, considering that the parameters which affect the network capacity are fixed over a given origin-destination matrix. Traffic engineering considers traffic flows as being constant and tries to optimize the control parameters in order to optimize certain parameters and measures of effectiveness. These two procedures, although largely depend on each other and known as the combined traffic assignment and control problem, are usually handled separately. The recent scientific and research developments in the fields of traffic assignment, with the rapid development of the advantageous Dynamic Traffic Assignment models, the new dynamic traffic control strategies and the evolution of ITS tend to modify the way with which networks are being modelled and their efficiency is measured. The current paper aims to present the major findings out of a critical review of existing scientific literature in the fields of dynamic traffic assignment and traffic control. Combined traffic assignment and traffic control models are discussed both in terms of the underlying mathematical formulations, as well as in terms of algorithmic solutions, in order to better evaluate their applicability in large scale networks. In addition, a generic and easily transferable scheme, in the form of a methodological framework for the Combined Dynamic Traffic Assignment and Urban Traffic Control problem is presented and applied on a realistic urban network, so as to provide numerical results and to highlight the applicability of such models in cases, which differ from the standard test networks of the related bibliography, which are usually of simple nature and form.
Evangelos Mitsakis; Josep Maria Salanova; George Giannopoulos. Combined dynamic traffic assignment and urban traffic control models. Procedia - Social and Behavioral Sciences 2011, 20, 427 -436.
AMA StyleEvangelos Mitsakis, Josep Maria Salanova, George Giannopoulos. Combined dynamic traffic assignment and urban traffic control models. Procedia - Social and Behavioral Sciences. 2011; 20 ():427-436.
Chicago/Turabian StyleEvangelos Mitsakis; Josep Maria Salanova; George Giannopoulos. 2011. "Combined dynamic traffic assignment and urban traffic control models." Procedia - Social and Behavioral Sciences 20, no. : 427-436.
The process and criteria for freight modal choice behavior in Greece were investigated in research between 2004 and 2009. The work involved a large-scale survey of various freight transport actors in Greece; a full statistical analysis of the results and a presentation to determine priorities, preferences, and detailed rankings of mode choice criteria; and a modeling exercise to produce models that depict the mode choice behavior of Greek firms. This paper discusses the questionnaire survey, characteristics of the participating firms, the decision-making process used for choosing the mode of transport, and the criteria used for mode choice decision making in Greece. The results contain conclusions and data that can be used to describe mode choice behavior in freight transport not only in Greece but also in other countries. These are summarized as reliability and quality of transport services, transport cost, characteristics of the transport chain, and the prevailing governmental policy and its corresponding legal framework for operation of the transport market. A future paper will contain the results of the modeling exercise and the various models of freight mode choice behavior that were formed
T. P. Moschovou; G. A. Giannopoulos. Investigation of Inland Freight Transport Modal Choice in Greece. Transportation Research Record: Journal of the Transportation Research Board 2010, 2168, 43 -52.
AMA StyleT. P. Moschovou, G. A. Giannopoulos. Investigation of Inland Freight Transport Modal Choice in Greece. Transportation Research Record: Journal of the Transportation Research Board. 2010; 2168 (1):43-52.
Chicago/Turabian StyleT. P. Moschovou; G. A. Giannopoulos. 2010. "Investigation of Inland Freight Transport Modal Choice in Greece." Transportation Research Record: Journal of the Transportation Research Board 2168, no. 1: 43-52.
The purpose of this paper is to review the developments of the last 15 years in the field of Freight Transport research and innovation, primarily (but not exclusively) in Europe focusing on the “Intelligent Transport Systems” aspects.
George A. Giannopoulos. Towards a European ITS for freight transport and logistics: results of current EU funded research and prospects for the future. European Transport Research Review 2009, 1, 147 -161.
AMA StyleGeorge A. Giannopoulos. Towards a European ITS for freight transport and logistics: results of current EU funded research and prospects for the future. European Transport Research Review. 2009; 1 (4):147-161.
Chicago/Turabian StyleGeorge A. Giannopoulos. 2009. "Towards a European ITS for freight transport and logistics: results of current EU funded research and prospects for the future." European Transport Research Review 1, no. 4: 147-161.
This paper presents the rationale, the method, and the alternative choices in the process of restructuring the Hellenic Railways Organisation (OSE). The most likely alternative structures regarding ownership and management issues of the new entities that will inherit the old OSE organization, and discusses the strategic implications of these alternatives are discussed. A critical view of the process of Greek railway reform and the evaluation results of the alternative organizational structures for the new situation are presented. It first presents the current experience in European Union and other countries of Europe, and the relative position of the Greek railways vis‐à‐vis the most common practices. The most likely options for the new organizational structure are presented which will result from the application of the European Union Directives and the Greek Law 2671/98 for the reorganization of the Greek railways. Based on a more detailed presentation of expected income and expenditures (i.e. economic viability) of the alternatives, a structure and a roadmap to these reforms is recommended for a successful and, above all ‘implementable’, reform of the Greek railways under the current conditions. Finally, the process for change and restructuring is described in terms of the basic principles and procedures that should be followed, and in terms of the necessary steps and procedures for the transition from the current to the new situation.
G. A. Giannopoulos; K. Giannakos. Restructuring the Greek Railways: Current Progress and Evaluation of Alternative Schemes. Transport Reviews 2007, 27, 355 -378.
AMA StyleG. A. Giannopoulos, K. Giannakos. Restructuring the Greek Railways: Current Progress and Evaluation of Alternative Schemes. Transport Reviews. 2007; 27 (3):355-378.
Chicago/Turabian StyleG. A. Giannopoulos; K. Giannakos. 2007. "Restructuring the Greek Railways: Current Progress and Evaluation of Alternative Schemes." Transport Reviews 27, no. 3: 355-378.
George Giannopoulos; Yannis Tyrinopoulos. Intermodal Freight Transport Between Europe and Asia: A Structured Approach to Policy Making and Problem Solving. Transportation Research Record: Journal of the Transportation Research Board 2006, 1966, 16 -26.
AMA StyleGeorge Giannopoulos, Yannis Tyrinopoulos. Intermodal Freight Transport Between Europe and Asia: A Structured Approach to Policy Making and Problem Solving. Transportation Research Record: Journal of the Transportation Research Board. 2006; 1966 ():16-26.
Chicago/Turabian StyleGeorge Giannopoulos; Yannis Tyrinopoulos. 2006. "Intermodal Freight Transport Between Europe and Asia: A Structured Approach to Policy Making and Problem Solving." Transportation Research Record: Journal of the Transportation Research Board 1966, no. : 16-26.
George Giannopoulos. The application of information and communication technologies in transport. European Journal of Operational Research 2004, 152, 302 -320.
AMA StyleGeorge Giannopoulos. The application of information and communication technologies in transport. European Journal of Operational Research. 2004; 152 (2):302-320.
Chicago/Turabian StyleGeorge Giannopoulos. 2004. "The application of information and communication technologies in transport." European Journal of Operational Research 152, no. 2: 302-320.
Eugène Dürr; George Giannopoulos. SITS: a system for uniform intermodal freight transport information exchange. International Journal of Transport Management 2003, 1, 175 -186.
AMA StyleEugène Dürr, George Giannopoulos. SITS: a system for uniform intermodal freight transport information exchange. International Journal of Transport Management. 2003; 1 (3):175-186.
Chicago/Turabian StyleEugène Dürr; George Giannopoulos. 2003. "SITS: a system for uniform intermodal freight transport information exchange." International Journal of Transport Management 1, no. 3: 175-186.
G. A. Giannopoulos. Implications of European transport telematics on advanced logistics and distribution. Transport Logistics 1996, 1, 31 -49.
AMA StyleG. A. Giannopoulos. Implications of European transport telematics on advanced logistics and distribution. Transport Logistics. 1996; 1 (1):31-49.
Chicago/Turabian StyleG. A. Giannopoulos. 1996. "Implications of European transport telematics on advanced logistics and distribution." Transport Logistics 1, no. 1: 31-49.
G. Giannopoulos; Muhammad Mustafa. Saturation Flow and Capacity of Shared Lanes: Comparative Evaluation of Estimation Methods. Transportation Research Record: Journal of the Transportation Research Board 1996, 1555, 50 -58.
AMA StyleG. Giannopoulos, Muhammad Mustafa. Saturation Flow and Capacity of Shared Lanes: Comparative Evaluation of Estimation Methods. Transportation Research Record: Journal of the Transportation Research Board. 1996; 1555 ():50-58.
Chicago/Turabian StyleG. Giannopoulos; Muhammad Mustafa. 1996. "Saturation Flow and Capacity of Shared Lanes: Comparative Evaluation of Estimation Methods." Transportation Research Record: Journal of the Transportation Research Board 1555, no. : 50-58.
The paper deals with the impact of telecommunications and information technology on the operation of transport systems in general. The interaction and cooperation of telecommunications with information technology and computers, is better known in Europe by the term ‘telematics’. The paper systematically examines the current applications of telematics in the operation and control of vehicles and traffic, and customer information and demand management. All modes of transport are examined but the main emphasis is on road and rail. The discussion combines the actual applications as well as their main results to date, with some critical appraisal of the success so far, and the prospects for future improvements. Then possible future developments in this field are discussed for road and rail, both passenger and freight. The outlook is not always bright and the problems and difficulties encountered are considered. The overall conclusion is that telematics in the field of transport operation has been applied for some time now, with mixed results. We are currently in a transitional phase where a lot can be done to take advantage of some truly exceptional opportunities that have opened up, but also a lot can be lost if the difficulties and problems involved are not faced in a proper and integrated way by all the ‘actors’ involved. Appendix 1 of the paper gives a brief review of the current initiatives by individual country, the industry, and the international organizations to provide greater use of telematics in transport operation in the future.
G. A. Giannopoulos. The influence of telecommunications on transport operations. Transport Reviews 1989, 9, 19 -43.
AMA StyleG. A. Giannopoulos. The influence of telecommunications on transport operations. Transport Reviews. 1989; 9 (1):19-43.
Chicago/Turabian StyleG. A. Giannopoulos. 1989. "The influence of telecommunications on transport operations." Transport Reviews 9, no. 1: 19-43.