Nikša Jajac

Decision Support System for emergency management on motorway networks

This article presents an approach to problems of emergency management on motorways using a Decision Support System (DSS). The advantages of this approach in comparison with conventional operational methods are acceptable data management costs provided by spatial data already stored in a Geographical Information System (GIS), generation of new data using various spatial functions as well as transparency for all emergency services. DSS deploys GIS in conjunction with other decision models thus becoming a powerful tool for the coordination of all participants in a decision-making process during emergency situations giving them a more cooperative surrounding. For the purpose of more efficient emergency management on motorways, the main idea is to provide an organisational support by combining GIS with decision models in order to provide an effective spatial DSS concept.

Podrška odlučivanju u upravljanju prometnim projektima u urbanim sredinama

Faza planiranja unutar upravljanja urbanim prometnim projektom složen je proces kako sa stajalista menadžmenta tako i s tehnicko-ekonomskih stajalista. Ovo istraživanje usmjereno je na procese donosenja odluka vezanih za fazu planiranja prilikom upravljanja urbanim cestovnim infrastrukturnim projektima. Predloženi koncept se temelji na visekriterijskim metodama te na umjetnim neuronskim mrežama. U ovom radu predstavljeni koncept za podrsku odlucivanju testiran je na cestovnoj infrastrukturi grada Splita i prikazuje nacin na koji se može unaprijediti planiranje urbane cestovne infrastrukture.

Selection of the Method for Rehabilitation of Historic Bridges—A Decision Support Concept for the Planning of Rehabilitation Projects

ABSTRACT This article presents a decision support concept for management of rehabilitation projects. The focus of the research is on the application of multicriteria methods of decision-making in planning a historic bridge rehabilitation project. The problem addressed in this research is a major one from many different perspectives, such as civil engineering, economics, etc., which indicates a need for the evaluation of different rehabilitation methods using several different criteria. Therefore, a decision support concept for a historic bridge rehabilitation method based on the PROMETHEE method has been designed. Three groups of stakeholders have been included (civil engineering experts, economic experts, and government experts) to define appropriate criteria, their weights, and preference functions. For determination of criteria weights, the AHP method has been used. The model has been tested on the problem of choosing the rehabilitation method for the Pavića Bridge in Croatia.

DECISION SUPPORT CONCEPT FOR MANAGING THE MAINTENANCE OF CITY PARKING FACILITIES

In this paper, we study the maintenance of city parking facilities (CPFs), specifically on modeling and support for decision-making related to planning CPF maintenance. Managing the maintenance of CPFs is complicated because it is a multi-disciplinary problem involving many participants, huge quantities of information, limited budgets, and conflicts of goals and criteria. These facts indicate that the decision-making processes in managing the maintenance of CPFs are ill-defined problems. To help maintenance managers cope with this complexity, we propose an approach that combines analytic hierarchy processing (AHP) and PROMETHEE multicriteria methods, and apply this approach to a priority-setting problem. After assessing the conditions of existing CPFs and the planned states of those CPFs, our approach produced a goal tree and criteria, and defined possible actions for the parking facilities. Representatives of stakeholders provided criteria weights by applying the AHP method. Using PROMETHEE II, we ranked the priorities, and the PROMETHEE V method allowed us to define the implementation phases of maintenance, producing the final maintenance plan. We validated our concept in the city of Split.

Systemic Approach to the Integration of Motorway Networks into European Emergency Number 112

In recent years, the world has focused on the protection of critical infrastructures, especially in the field of transportation, which is particularly critical considering traffic accidents. This paper presents the procedure for categorisation of the efficiency level of an existing motorway emergency system, as well as presenting the most important basis for the design of a new emergency management system based on Information and Communication Technology (ICT) tools, geographic information systems and systems for operative procedures. The whole motorway emergency management system should be improved with eCall technology. Using the systemic approach and taking into account the available emergency services, such as police, medical emergency services and fire brigades, a procedure for making the optimal schedule is proposed. For each emergency service, the fastest-route principle is defined, taking into account available road networks, traffic intensity, road closures caused by accident, etc.

Urban Road Infrastructure Maintenance Planning with Application of Neural Networks

The maintenance planning within the urban road infrastructure management is a complex problem from both the management and technoeconomic aspects. The focus of this research is on decision-making processes related to the planning phase during management of urban road infrastructure projects. The goal of this research is to design and develop an ANN model in order to achieve a successful prediction of road deterioration as a tool for maintenance planning activities. Such a model is part of the proposed decision support concept for urban road infrastructure management and a decision support tool in planning activities. The input data were obtained from Circly 6.0 Pavement Design Software and used to determine the stress values (560 testing combinations). It was found that it is possible and desirable to apply such a model in the decision support concept in order to improve urban road infrastructure maintenance planning processes.

Application of Snapback Chronometry Method in Calculation of Regulation

Work study is an area of construction production rationalization in which with scientific, logical, holistic and system analysis methods of the process we gain optimum in way of work and time of work. Chronometry method is one of the work study methods which is appropriate for recording shorter cyclic processes and is based on statistical sampling theory. Determination of cyclic times and work performances of standard cyclic construction machines (SCCM) is one of key assumptions of dynamic planning of machine work on every construction site. Calculation methods of SCCM work performances are one of basic research objects in the field of construction organization and technology. Study shows applied chronometry method in work of standard cyclic construction machine. Goal of this study is to accomplish regulation through measured time cycle and compare measured effects with effects obtained with standard methodology of calculating hydraulic excavator practical achievement for gaining regulation in order to determine main reasons which effect work performance on site.