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24 Scientific Journals of the Maritime University of Szczecin, no. 24 / 2010



 

Recent Submissions

  • Woropay, Marcin; Perczyński, Daniel (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article presents a method for choosing technical objects to be used for execution of tasks by a control subsystem. The research object used to illustrate the discussion presented in the paper is a municipal bus transport network, in a given agglomeration. In order to solve the discussed problem the homogenous Markov's process has been accepted to be a mathematical model of the bus operation process. The ratio of the object's mean probability of being in its serviceability state to a time unit ,has been accepted as a criterion for choice (purchase) of a given make of the bus
  • Woropay, Marcin; Migawa, Klaudiusz (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article presents a method of defining the required number of substitute technological objects used in the transport system, necessary for correct carrying out of the assigned transport task. The whole of the consideration was presented using the example of a chosen authentic system of the operation of transport means. On the basis of the identification of the authentic transport system and the means of transport operation process carried out in it, crucial operational states were designed as well as the possibilities of transferring between the particular states. Based on that, an event-centered model of the use of the means of transport was built, followed by a mathematical model of that process, assuming that its model is the homogenous Markov process. Then, for operational data obtained from research conducted in the authentic transport system, the values of the analyzed characteristics were defined. The presented results are a result of the research conducted as a part of a larger research project pertaining to the construction of a decision-making model of controlling transport system availability
  • Wolniak, Radosław (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The improvement of industrial enterprises requires a level of growth of enterprise innovation. The innovation at an economic scale has an influence on economic growth which is expressed by means of GDP per capita. There are clear correlations between innovation factors and a level of economic growth in the EU countries. The publication presents the analysis of chosen, mostly used innovation factors within an innovation influence side at level of prosperity in a given economy. On the basis of the gathered data, a model of linear regression describes dependence between innovation and GDP per capita. The situation of Poland has been examined in comparison with the other EU countries within a scope of innovation level in an entire innovation aspect, a contribution into innovation activity and innovation effect. The problems of the Polish economy in case of innovation effects, which are the lowest among the EU countries, have been also focused on in the following publication
  • Tubielewicz, Andrzej; Forkiewicz, Marcin; Kowalczyk, Piotr (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    Seaports play a very important role in the international sea-land transport chains and have a strong effect on the efficiency of foreign trade. As their influence on the regional economy and society is also significant, they face a high security risk. That is why they should be specially protected as infrastructural facilities of critical importance to the state. Moreover, protection of seaports constitutes and important element of the general concept of crisis management on local, regional and international levels. In recent years, both the European Union, by adopting the directive on enhancing port security, and the International Maritime Organization, by preparing the International Ship and Port Facility Security (ISPS) Code, have paid special attention to the protection of seaports against any incidents endangering their security. Vital among such activities is the preparation and implementation of a seaport protection plan and port facility protection plans. Those plans need to be consistent with the port critical infrastructure protection plan
  • Szpytko, Janusz (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The paper is focusing on exploitation process of transport devices based on preventive strategy approach. The two – condition based technical state of the device under operation has been described. It has been proposed time – and cost – oriented preventive type approaches to maintenance processes of the devices, which was discussed in details
  • Szewczyk, Paweł (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    To avoid the growth of organisms of different types on surfaces in a marine or freshwater environment usually coatings incorporating biocides (chemicals that kill organisms) are used. Instead of these biocide containing coatings there exist several approaches of nanostructuring the surfaces which prevents biofilm formation and bacterial adhesion as well as the attachment of larger organisms. In this paper results of a preliminary literature review on the potential role of nanotechnology in solving ecological problems concerning antifouling coatings are presente
  • Szczęśniak, Bartosz (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The EPC methodology enables accurate modelling of economic processes. One of the main spheres of its application is procedure creation under quality, occupational health and safety or environment management systems. The development of the methodology in question has led to establishment of precise conditions that must be conformed with in a correct process model. The main theme of the article is a general discussion of the EPC methodology. Based on an analysis of numerous literary studies published, a set of principles that should be met by an EPC diagram as a graphical representation of the process being described has been identified and discussed. Another subject touched upon in the article is the results of examinations of 156 diagrams from documents of integrated management systems implemented in two companies. The examinations conducted have implied that the diagrams created in the course of the documentation drawing up do not conform with many of the applicable requirements. The individual syntax errors occurring in the documents have been identified and discussed in the paper, and special attention has been paid to those related to application of the OR and XOR split connectors as well as those occurring when joining diagrams
  • Świeboda, Halina (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article presents the factors affecting labor security in terms of the quality of life. Author’s own study results were presented, over the perception of changes at work, occurring as a result of the emergence of information society as well as their effects on labor security and the quality of life
  • Skotnicka-Zasadzień, Bożena (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    This article presents the use of Pareto’s method and Ishikawa’s diagram for analyzing flaws which occur in a hydraulic prop produced for the mining industry. The study has pointed out that a human’s mistake and badly matched materials are the reasons of occurred incompatibilities. Correcting measures were proposed in the conclusions
  • Sitko, Jacek (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article is showing selected aspects of the production, quality control and analysis of reasons for appearing material defects in termoisolation elements. On samples chosen for examinations an inspection appearing of defects was conducted. A production method and a quality semi finished products were analysed with respect to the influence on coming into existence defects
  • Sienkiewicz, Piotr (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article presents the basic notions and definitions of systems security. The model of threats for systems security and a general model of a safe system (i.e. secured against outside and inside threats) were discussed. The problem of systems security management, considering particularly the management of risk, was define
  • Sidun, Jarosław (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The internal fixation of maxillofacial fractures with plates and distracters has gained growing popularity during the last decades. The design of implants for fracture fixation has undergone a gradual evolution over the years as researchers have tried to facilitate healing and decrease the rate of complications. Osteolysis is one of the foremost problems limiting the survival of current implantation procedures. It is induced by the wear particles and corrosion products which incite an inflammatory response resulting in bone resorption and eventual loosening and failure of the bone fixation. The future research will help to limit the effects of wear particles by identifying the most suitable bearing surfaces. The pathologic cascade of events triggered by wear particles may be a potential site of action for drugs intended to prevent or check the progression of the disease. The paper presents a damages problems of the maxillofacial plate fixation. The surface failure at plate stabiliser elements showed typical damages for this system. Damages of screw’s steepl heads as well as the surface layers failure of the the coned seat on tie plates were observed. The surface failure at a screws were visible in a lesser degree. The biggest wear areas are visible on the cooperating surfaces of the plate sockets and the bone screw heads. Many types of damage characteristic of processes of corrosion damage and tribological wear, mainly abrasive, adhesive, and fretting wear, are observed here
  • Ranatowski, Eugeniusz; Ciechacki, Krzysztof (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    A physical model of laser welding process is presented. At the beginning of this paper a short characteristic of correct modelling procedure is shown. In the further part, the form of heat transport in laser welding is described. Also the cylindrical-involution-normal (C-I-N) heat source (H-S) model and the Fourier – Kirchhoff partial differential equation are made and discusse
  • Pawlak, Andrzej (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    In this paper, we examine sources of optical radiation and the effects of interaction of specific types of optical radiation i.e. ultra-violet, visible and infra-red, on a human organism. Next, the current criteria for assessing optical radiation hazards and contemporary measurement methods for establishing the total and effective intensity of irradiation with ultra-violet radiation, as well as the intensity of irradiation with infra-red and visible radiation. In the following section, examples of temporary working posts for welders were presented, as used during maintenance works aboard ships. Measurement results for optical radiation at the selected working post were then quoted, accounting for three specific exposure times. The last section contains conclusions drawn from measurement results and interviews with a group of ship hull welders
  • Okrzesa, Jerzy (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article herein presents the example of production solution during performance of additional, big and prestige production task. This task was conducted simultaneously to a current ordinary production in a determined time, with existing production area, machines, technological capacity and existing number of human resources. It shows solutions that were applied for additional production contract in a situation of full capacity load of current production
  • Molenda, Michał (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article presents the main international legal regulations and technical requirements on ship recycling. The initial part of the article describes the international context of the genesis problem and the efforts of international institutions in regulating the practices associated with the disposal and recycling of ships. Later in the development of policies which set out the International Maritime Organization by the recycling of ships and briefly characterizes the main international regulations in this regar
  • Milewska, Elżbieta (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The paper is characterized by efforts to create a business model of enterprise software and technical documentation. The author points out that the overriding factor is to identify actions to modeling, which defines the scope of the project. In mapping the organization and construction of scenarios of business processes is of paramount importance dictionary of phrases and descriptions of domain rules of correctness for the recording and processing. The author describes the key process models, partial (procedures) and elementary (the workflow map.) This indicates the suitability of BPMN and UML notation in the record of the mapping rules and modalities for the functioning of the organization and in the description of static and dynamic structure of the system. Pointing to the integration of business process management system architecture author assesses the suitability of the chosen modeling notation
  • Szczęśniak, Bartosz; Midor, Katarzyna; Zasadzień, Michał (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    This article is a trial to describe an author’s research method of measurement of an inside client’s satisfaction where in an enterprise, a inside client is production departments whose satisfaction with traffic maintenance staffs is to be assessed This method is based on a questionnaire survey which is conducted by means of two specialty prepared questionnaires. The first questionnaire refers to a production department’s satisfaction with actions taken by traffic maintenance staff and the second allows to assess the abilities of realizing tasks by traffic maintenance department in an organization. The obtained results, after analysing, allow to point out areas where repair actions should be taken or actions which are to improve the cooperation between analysed departments. This method is still at the stage of testing
  • Szczęśniak, Bartosz; Midor, Katarzyna; Zasadzień, Michał (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    This article focuses on the sources of conflicts between a traffic maintenance department and production department which are very often unidentified by managers of an organization. These conflicts lead to the reduction of affectivity of an enterprise thus, the authors of this article tried to indicate all causes which result in an inappropriate cooperation between them. The identification of these problems and their analysis will let the organization take actions, which will improve the cooperation between two closely cooperating departments which, in turn will result in bigger effectiveness. The analysis of the problem was conducted in one of production company in Silesia voivodeship
  • Michlowicz, Edward; Karwat, Bolesław (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    Most of modern companies implement to the management principles known as “lean”. One of the methods proposed by Lean Management is a TPM (Total Productive Maintenance). There are applications of this method in relation to production systems. TPM can also be used to improve the quality of internal transport systems. The article presents the basic principles of TPM used in the method, as well as its use in stock products ready for distribution and in division of the car wipers
  • Zeńczak, Wojciech; Michalski, Ryszard (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article characterises the properties of steam and special thermal oils as the basic heating media on motor ships. The features of the heating installations have been presented with the particular attention drawn to thermal oil installations in which exhaust gas heaters have been employed. Also an example of the comparative exergetic analysis has been included demonstrating the comparison between steam generation in exhaust gas boiler and oil heating system in the heater, assuming the identical heat flux transferred in the boiler and the heater from the exhaust gas to the heating medium (steam and thermal oil) and assuming identical increase of exhaust gas entropy in the heat exchangers under examination
  • Michalski, Krzysztof (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The need of being competitive and will to meet clients’ needs makes organizations form mining branch improve their actions. There is a wide variety of system-like solutions for such organizations, such as: quality management system, environment management system, and security and safety management system and social responsibility system. The tendency of implementing and connecting some of the above mentioned solutions has resulted in the integrated management systems. An organization which is prepared in such a way often decides for the next step which allows for self-improving even more efficiently, which in turn results in a quicker reaction to clients’ needs- the implementation of process-like attitude. The process-like attitude allows to identify weak elements of organization as well as help to improve them and identify those which should be included in an organization
  • Mazurkiewicz, Jacek (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The study refers to questionnaires in which on the basis of scoring of each question, it can be concluded about a formulated research hypothesis. The following paper examines ways of developing, instituting and analyzing surveys in order to accept or reject stated hypothesis. In particular the focus is on measuring credibility of answers provided by participants in the survey. Each answer is scored along two criteria: person’s credibility and significance of the question. The final score is a weighted average of those two variables. This method is particularly useful in surveys when anonymity of participants is not sufficient to guarantee a credible response
  • Leśmian-Kordas, Ruta; Bojanowska, Milena (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    In the article there have been presented the current state and perspectives in the scope of using rapeseed biomass, with particular consideration of solid biodegradable by-products of the technology of obtaining oils- -expellers and rapeseed meal. Rapeseed biomass has been characterised with respect to its technological properties essential in combustion processes, both after conversion into bio-char and bio-oil and with respect to its raw, unprocessed form. The reasonableness of applying this kind of agrobiomass in co-combustion with minable fuels has been shown, resulting from conditions of agricultural production, increasing rapeseed production and by-products, with their incomplete use in the land, in view of the obligatory increased participation of biomass in the structure of fuels applied for producing electric and heat energy. The current state of agrobiomass supply logistics to the boiler plant has been analysed, pointing out its significance in shaping demand satisfaction for biomass using rapeseed waste products
  • Landowski, Bogdan (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    This paper presents an example of applying Markov decision process to model and analyse the bus operation and maintenance process within an urban transport system and to forecast the influence of the operation and maintenance strategies realised for the technical objects on the transport system behaviour. Setting the values of the indices describing the process under the analysis is performed on the basis of a computerised simulation of the Markov decision process, being a mathematical model of the technical objects operation and maintenance process. In order to simulate the operation and maintenance process (Markov decision process) and to evaluate the influence of the decisions being made on the course and effectiveness of the process being realised within the study object a simulation algorithm has been elaborated and a computer calculation program has been written. The model presented herein has been created in such a way to assure that it shall be possible to use it in as extensive as possible class of the problems regarding the operation and maintenance of the technical objects
  • Kulesza, Zbigniew; Siemieniako, Franciszek (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    The article presents the mathematical model of the air brake system with two commonly used valves: the dual circuit foot brake valve and the relay valve. The system can be seen as a part of a typical brake system of heavy trucks. The model has been developed based on the previously elaborated and experimentally verified models of the components of the air brake systems. The model can be used at a design stage to predict the behavior of the system during the normal operation and during the sudden braking or malfunction. Differential equations of pressure changes in the chambers and motion equations of the pistons of membrane operated cylinders as well as algebraic equilibrium equations describing the motion of the moving parts of the brake and relay valves are presented. The values of all model parameters, such as, spring stiffnesses and pistons’ diameters, etc. have been determined by dismantling the valve or referenced from the literature. The experimental verification of the model is planned in the future

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