This paper examines the impact of supply on production results in the shipbuilding industry. The shipbuilding industry is characterized by extreme complexity concerning the integration of many other industries, and the product of this industry itself is very complex and expensive with a demanding degree of processing after-sales significant revenue. Numerous suppliers are involved in the production process, thus shipbuilding has a multiplicative effect on other industries. One of the fundamental factors for the efficiency and effectiveness of the business in this industry is the role of logistics. Supply in the shipbuilding industry is nowadays a strategic decision that actively influences business success, which is why it is considered in this paper. Simulating its impact on the production process seeks to avoid possible mistakes that cannot only weaken a company's competitive position but also its viability. The simulation concludes with a concrete example that there is a certain influence of time deviations (arrivals, exemptions, and complaints) on the increase of the basic value of the order. This paper highlights the need to maximize response speed to customer needs, through the synthesis of planning activities, business logistics, and to maintain competitiveness in an increasingly demanding global market.
The possibility of interval extension between two dry docking is alternatively offered to the shipowners by classification societies. Although, for now, such a possibility is limited only to certain types of ships, a significant shift has been accomplished in accordance with today's technical and technological capacities. It is quite clear that not all shipowners will accept this option, as either five-year or even mid-interval might suit them well. The option introduces an economic benefit, but requires additional preparation to withstand the full interval without negative consequences, primarily related to the protection of underwater part of the hull. The relationship of economic benefits and the cost of investment to successfully pass the complete period gives a clear view to the shipowner for the decision of accepting an extended dry docking period between two consecutive dry dockings. This paper is presenting one of the approaches to calculate feasibility of prolonging dry docking interval. Calculation example represents an economic indicator, crucial for shipowner’s decision to accept prolonged dry docking interval. The paper presents an analysis of underwater hull condition for the vessel with a composite coating. It is based on a collection of actual data registered in the period of seven years. Significant data have been derived from the analysis, allowing basic set up for theoretical assessment as well as the real justification of extended dry docking period between two consecutive dry dockings of the vessel. Some of the presented facts, related to underwater composite coating, might be used for similar calculations.
Knowing the process of generating exhaust emissions and the determination of influential parameters are important factors in improving two-stroke slow-speed marine engines, particularly for further reductions in fuel consumption and stringent regulations on the limitation of nitrogen oxide emissions. In this article, a model of a marine low-speed two-stroke diesel engine has been developed. Experimental and numerical analyses of the nitrogen monoxide formations were carried out. When measuring the concentration of nitrogen oxides in the exhaust emissions, the amount of nitrogen dioxide (NO2) is usually measured, because nitrogen monoxide is very unstable, and due to the large amount of oxygen in the exhaust gases, it is rapidly converted into nitrogen dioxide and its amount is included in the total emission of nitrogen oxides. In this paper, the most significant parameters for the formation of nitrogen monoxide have been determined. Model validation was performed based on measured combustion pressures, engine power, and concentrations of nitrogen oxides at 50% and 75% of maximum continuous engine load. The possibilities of fuel consumption optimization and reduction in nitrogen monoxide emissions by correcting the injection timing and changing the compression ratio were examined. An engine model was developed, based on measured combustion pressures and scavenging air flow, to be used on board by marine engineers for rapid analyses and determining changes in the concentration of nitrogen oxides in exhaust emissions. The amount of nitrogen oxide in exhaust emissions is influenced by the relevant features described in this paper: fuel injection timing and engine compression ratio. The presented methodology provides a basis for further research about the simultaneous impact of changing the injection timing and compression ratio, exhaust valve opening and closing times, as well as the impact of multiple fuel injection to reduce consumption and maintain exhaust emissions within the permissible limits.
Today the main problems of the islands are the poor demographic picture caused by depopulation, low birth rate, prevalence of the elderly population, and relatively low economic activities. In that reason, the paper presents the influence of the traffic connections between Croatian's islands and mainland on the demographic picture of the islands. The aim of this paper is to conduct systematic and scientifically research of influence various factors on the demographic picture of the islands in order to insure the sustainable development of the islands and the retention of the inhabitants on the islands. This paper analyzes the population of Croatian's islands according to the latest census and the category is correlated with the most prominent limiting factor of development, which is the traffic connection between islands and mainland. The research shows that the improvement of traffic connection and increased density of traffic network between islands and mainland does not have a direct impact on the number of island's population, but it has a positive impact on all economic and social activities, by creating the prerequisites for sustainable development of the islands and raising the quality of life on islands, as evidenced by the growth of the island's population on bridged islands and drop population in small islands and islands unrelated to bridges. Sažetak Danas su glavni problemi na otocima loša demografska slika uzrokovana depopulacijom, niske stope rođenih, pretežito starija populacija i relativno oskudne ekonomske aktivnosti. U tom smislu članak predstavlja utjecaj prometnih povezanosti među hrvatskima otocima i kopnom te demografsku sliku otoka. Cilj je ovoga članka provesti sustavno i znanstveno istraživanje ujecaja različitih čimbenika na demografsku sliku otoka kako bismo osigurali održivi razvoj otoka i zadržali stanovnike na otocima. Ovaj članak analizira populaciju otokâ prema zadnjem popisu stanovništva i kategoriju povezanu s najistaknutijim ograničavajućim čimbenikom razvoja, to jest prometnu povezanost među otocima i kopnom. Istraživanje pokazuje da poboljšanje prometne povezanosti i povećana gustoća prometne mreže između otoka i kopna nema izravan utjecaj na razinu populacije na otoku, ali ima pozitivan utjecaj na sve ekonomske i društvene aktivnosti, stvaranjem pretpostavki za održivi razvoj otoka i podizanje kvalitete života na otocima, kao što je evidentirano porastom populacije na otocima s mostom i padom populacije na malim otocima i otocima nepovezanih mostom. KEY WORDS island's population transport connection between islands and mainland island's economy sustainable development KLJUČNE RIJEČI populacija otoka transportna povezanost otokâ i kopna otočno gospodarstvo održivi razvoj
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