This paper deals with the method which makes it possible to complete an assessment of the harmful exhaust emission level of the Otto engine in different modes of operation. Thus the paper specifically reviews: idling, stationary loads, acceleration, and deceleration. The authors discuss the impact of input values in the process of assessment upon the output values. In the process, respective concentration as well as the total volume of toxic components in a given period ·have been established. The assessment is based upon a complete estimate (computation) of a cycle in the engine cylinder while the load is selected from the system of the Europe-test. The results obtained have been verified in an experiment.

The author discusses the process of rationalization by introduction of the ŽEPK management and information system in the Rail Transport Company of Zagreb and reviews its technical and technological and economic effects. Then the author provides the assessment of recommendations with reference to the fact that the very process as a segment cannot yield the wanted effects on the entire system unless synchronized on the entire network of Yugoslav Railways. This brings us to the fact that our only prospective refers to the synchronous activities and integration into the European rail system as a partner in its own right. The path leading to the materialization of this as compared to the current state of affairs appears to be a difficult one however any failure to integrate leads us into an unavoidable traffic isolation to inevitably exhibit adverse influence onto our entire social/ economic development in the future.

This paper provides a review of legal provisions effective in Europe and the states aimed at the reduction of harmful diesel exhaust emissions. Resolutions of the problems resulting from respective reduction of harmful emissions fall into three groups: improvements of the structure and technology of the engine, utilization of higher-quality fuels and lubricants and treatment of gases upon exhaust from the cylinder.

Connectionism represents a possible approach to the resolution of the issues of insufficiently described traffic systems. The system for keeping records on transport capacities of the fleet has been structured by a system of processing units. The output of an individual unit has been determined by the number of products of multiplication of the incidence of input attributes and the strength of their association links. The proposed model has been implemented for vehicles of the fleet described with eight groups (classes) of information. Verification of the application of the connectionism model within the scope of expedite monitoring (follow-up} of performance of transportation means has been completed in an effort of searching for the characteristics of the vehicle according to the data from the records (register) on individual vehicles, identification of the vehicle according to an insufficient description of its characteristics and in cases of spontaneous generalization of characteristics of a vehicle.

Some relevant studies show that telecommunications and respective system of services (utilization) possess the characteristics of a natural monopoly, further confirmed by the established effects of the economic scale of 1.04-1.16. Nevertheless the effects of liberalization and privatization and introduction of competition in a number of countries are positive and filter through to even the level of local network and lines. Within this scope (from the aspect business administration of operations) the thesis has been developed that the possible efficient solution refers to an asymmetrical aspect of competition with competitors’ access permissions 011 the basis of concessions and compensations. Respective concept can find its justification in the case of a low level (smaller volumes) of telecommunications system development - the system of basic services - while for the telematic services an open competition is desirable.

This paper deals with certain possibilities of telecommunications service improvement in rural areas with particular reference to social and economic advantages for the inhabitants. Based on the derived relation for respective telephone demand (the relation between the incidence of calls and the distance of telephone locations) it is possible to assess the economic benefits by means of a simulated model of spatial distribution of telephone locations. In relation to the idea of the telecommunications traffic volume and the surplus number of users (the relation of benefits and costs to the user) respective economic benefit reveals and reflects itself in the reduction of the distance travelled by a telephone user in a rural area.

U radu se daje opći prikaz nove PTT usluge- radiopoziva (radio-paging}, koja se realizira u suradnji s RTV. Prvo se opisuje konfiguracija sustava radiopoziva, te se daje pregled osnovnih značajki njegovih glavnih dijelova. Zatim se analizira razvoj radiopoziva u svijetu i u nas. Na kraju se razmatra perspektiva ove usluge u odnosu na mobilnu telefoniju, te pretpostavlja njen mogući razvoj.