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Journal Details
Format
Journal
eISSN
2083-4608
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English

Search

Volume 45 (2018): Issue 1 (March 2018)

Journal Details
Format
Journal
eISSN
2083-4608
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English

Search

19 Articles
Open Access

The Idea of Modification of Work Conditions for the Reduction of the Pilot’s Workload in a Glider, Type SZD-30

Published Online: 29 Oct 2018
Page range: 7 - 26

Abstract

Abstract

The paper presents a method for identifying the risk of disorders in the muscular and skeleton system, which would enable an assessment of the load of the motoric system that constitute one of important aspect for ergonomic risk. The result of the research made with use of the RULA method confirms the necessity of an urgent implementation of correcting actions aimed at improving the ergonomics of the pilot’s cabin. Some of them are difficult to put into practice in view to their high costs. One should also remember that the exploitation period is nearly expired so the implementation of improvements does not make much sense. However, there is a possibility of implementing many modifications that do not require high costs and that do not affect significantly the construction of the glider.

Keywords

  • workload of a pilot
  • disorders in the muscular and skeleton system
  • reliability of a pilot
Open Access

Ecological Safety of the Baltic Sea in the Aspects of Corrosive Reprocessing of Containers with Toxic Warfare Agents

Published Online: 29 Oct 2018
Page range: 27 - 44

Abstract

Abstract

Issue of Corrosion of chemical ammunition dumped in Baltic Sea after WW2 is actual because of recent accidents involving contamination of fish, burns of fishermen and uncautious beach – goers by substances released from chemical ammunition show the need of taking counteractions. This poses a question, if extraction of these dangerous cartridges is possible in safe way without unsealing containers and releasing chemical measures into the environment. The aim of this paper is to examine corrosion rate of chemical munitions materials (in mm/year). This rate allows valuation of time period in which chemical containers remain sealed. In addition paper presents analysis of possibility of safe extraction of chemical ammunition without environment contamination.

Keywords

  • corrosion reprocessing
  • toxic warfare agents
  • sea water
  • environmental contamination
Open Access

Models of Airmen’s Aviation Activities Cycles in the Tactical Aircraft’s Operating System

Published Online: 29 Oct 2018
Page range: 45 - 66

Abstract

Abstract

The tactical aircraft’s operating system (system of a tactical aircraft’s operational usage) constitutes the main research area of this paper. The authors consider and look into the airmen’s aviation activities cycles which could be the basis for a clear and coherent indication and description of analyses domains for risk management’s processes in the tactical aircraft’s operating systems (TAOS). The first part of this paper presents the model of airman’s aviation activities cycle (AAAC) which indicates individual airman-aircraft relations during the realization an aircraft’s operator activities that allow to execute air missions. There is also indicated the relationship between the AAAC and the aircraft’s operating cycle (cycle of an aircraft’s operational usage). The second part of this paper presents the model of the series of airmen’s aviation activities cycles (SAAAC) that integrates, among others: models of AAAC, the process of daily air missions’ organizational and technical summary, the process of flight organization’s and air training effects periodic summary.

Keywords

  • air task
  • flight
  • air mission
  • model of airman’s aviation activities cycle
  • model of the series of airmen’s aviation activities cycles
Open Access

The Use of Bluetooth Standard for Communication Between Vehicles Under Traffic

Published Online: 29 Oct 2018
Page range: 67 - 82

Abstract

Abstract

Bluetooth is a type of wireless communication used to transmit voice and data at high speeds using radio waves. It is a standard protocol for short-range radio communications between many different types of devices, including mobile phones, computers and other electronics [1]. The use of this type of data transmission standard for voice communications at close range in the vehicle is commonly known. The trend of integrating new services in vehicles increases rapidly and Bluetooth is one of the emerging communication technologies for realizing ad-hoc networks. The paper presents the possibility of using Bluetooth to build ad-hoc network suitable for the transmission of sound, in particular voice data using the modulation GSFK. We analyzed the features or problems that Bluetooth offers for transmitting audio data in an ad-hoc network. Some initial results of simulations and real-life tests give an impression of the performance and efficiency this standard for the transmission of voice data in an ad-hoc networks [2].

Keywords

  • bluetooth standard
  • communication between vehicles in traffic
  • short-range wireless communication
Open Access

Markov Reliability Model for Heat Meters

Published Online: 29 Oct 2018
Page range: 83 - 96

Abstract

Abstract

The reliability of thermal energy meters is analysed using the Markov model which describes the operation of these meters in a large number of apartments and offices by a media accounting company. The data has been extracted from a relational database storing information on the operation, installation and exchange of these measures from the last 10 years. The built Markov model turned out to be ergodic, which allowed determining its limiting distribution. In addition, the probability distributions for the cumulated consumption were determined in the work - separately for all meters and meters’ failures.

Keywords

  • reliability models
  • Markov model
  • exponential distribution
  • Weibull distribution
Open Access

Accuracy Assessment of Aircraft Positioning by Using the DGLONASS Method in the GBAS System

Published Online: 29 Oct 2018
Page range: 97 - 124

Abstract

Abstract

The paper presents the accuracy results of aircraft positioning using the DGLONASS method in the GBAS augmentation system in air transport. In the research test, the coordinates of Cessna 172 aircraft were recovered on the basis of the DGLONASS technique. The calculations were executed in RTKLIB software in RTKPOST library in module “DGPS/DGNSS”. The raw GLONASS data from the onboard Topcon HiperPro receiver and also from the REF1 physical reference station were utilized in the research test. In the paper, the standard deviations of aircraft coordinates and integrity HPL and VPL parameters were presented and described. In the paper, the obtained aircraft coordinates from the DGLONASS method were compared and verified with the DGPS solution. For this purpose, the RMS-3D term and difference of ellipsoidal height of aircraft were estimated in the paper. The average value of RMS-3D equals to 1.71 m, however the difference of ellipsoidal height amounts to 1.46 m, respectively.

Keywords

  • GLONASS
  • ICAO
  • GBAS system
  • accuracy
  • integrity
Open Access

The Use of a Fuzzy Logic to Eliminate an Error in Measuring the Flight Altitude of the W-3 „Sokół” Helicopter

Published Online: 29 Oct 2018
Page range: 125 - 141

Abstract

Abstract

Along with the growing technology, helicopters are equipped with increasingly complex avionics and operational control systems. Such devices use a variety of input signals in order to enhance their performance. Owing to the use of electronic control systems, modern helicopters have a wide range of possibilities, both in terms of manoeuvrability and combat. The article presents a case study of designing equipment control systems on the example of a radio altimeter, which is mounted onboard the W-3 “Sokół” helicopter. The primary assumption was to design a fuzzy controller using FuzzyLogic Toolbox in the Matlab software package that will facilitate similar results, and, above all, will eliminate the altitude measurement error resulting from the bank of a helicopter.

Keywords

  • radio altimeter
  • Fuzzy Logic
  • helicopter W-3 „Sokół”
Open Access

Hardware Protections Increasing the Reliability of a Prototype Inverter Welder

Published Online: 29 Oct 2018
Page range: 143 - 163

Abstract

Abstract

The subject of the paper is a presentation of hardware protections, which increase the reliability of a prototype inverter welder. Under certain assumptions, the constructed device may be classified to a group containing objects with a serial reliability structure. As a result, the functionality of the inverter welder is provided, when all components (sub-assemblies) operate correctly. The paper presents the results of simulations, which confirm the essence of using each of the hardware protections. The tests were conducted using the ICAP/4 software by Intusoft.

Keywords

  • inverter welder
  • hardware protections
  • pulse systems
Open Access

Laboratory Station for Reliability Testing of Digital Circuits Using Signature Analysis

Published Online: 29 Oct 2018
Page range: 165 - 182

Abstract

Abstract

The article presented a laboratory station for diagnosing the digital circuits and the test results on the basis of a selected example. The idea of a response compression technique, which is called an analysis of signatures, was demonstrated. The main element of the station includes 8-bit programme of an analyser of signatures, which was developed by the authors, and implemented in the LabVIEW environment with the use of NI 6008 data analysis module. The programme operation was tested on the selected digital circuit, and the obtained results were provided in the article.

Keywords

  • signature analysis
  • diagnosis of digital systems
Open Access

Impact of Prosthetic Materials Manufacturing Process on the Reliability of Dentures

Published Online: 29 Oct 2018
Page range: 183 - 199

Abstract

Abstract

The paper presents a method of testing dental alloys used to produce frame dentures. The material constants stated by the manufacturers of dental alloys were verified. The impact of presented discrepancies on the durability and reliability of a frame denture was discussed.

Keywords

  • dental materials
  • materials tests
  • denture modelling
  • denture reliability
Open Access

Assessment of Durability of the Rail Vehicle Components with the Use of Degradation Analysis Method

Published Online: 29 Oct 2018
Page range: 199 - 224

Abstract

Abstract

An important issue during the operation of rail vehicles is the dynamics of forced loads. The identification of these workloads and the evaluation of their impact on the reliability and durability of the structure is essential for maintaining the safety of operation. For this reason, an important issue in the assessment of durability is to identify potential hazards that cause object failure. This paper presents the results of fatigue tests for the selected structure of a rail bogie. The results were then used to conduct the Degradation Analysis of the object. The purpose of this analysis was to estimate the real values of the durability and reliability indicators of the bogie frame from the point of view of the safety of its operation.

Keywords

  • degradation analysis
  • reliability assessment
  • railway boogie
Open Access

Optimisation of the Municipal Waste Collection Process in a Small Size and Scarcely Populated Municipality

Published Online: 29 Oct 2018
Page range: 227 - 246

Abstract

Abstract

The paper presents a review of legal conditions regarding the process of municipal waste collection. An analysis of systems and solutions for the management and monitoring of a fleet of vehicles that can be used in the operation of means of transport during the implementation of the municipal waste process was carried out. The paper presents a coherent concept of ICT system for the optimization of the municipal waste collection process in a small-sized municipality. The proposed system can be used by companies responsible for waste collection, transport and service companies participating in the waste collection process.

Keywords

  • exploitation
  • optimization
  • receiving of waste
Open Access

Numerical Simulation of the Process of a Technical Object State Changes

Published Online: 29 Oct 2018
Page range: 247 - 266

Abstract

Abstract

The article presents a construction method and an example of a model of a technical object operation process as well as the main stochastic assumption which is a mathematical model of an object state changes. The model of the operation process was built using an analysis of the state space and operation-related events of the analyzed technical objects. An example of numerical simulation of the technical object state change process as a tool to be used to support the analysis of the considered process. Numerical simulation of the stochastic process being a model of a technical object state change process makes it possible to determine the process characteristics impossible to determine in an analytical way.

Keywords

  • numerical simulation
  • operation process
  • stochastic process
  • object state
  • operation-related state
Open Access

Private Cloud Architecture - Analysis of Reliability

Published Online: 29 Oct 2018
Page range: 267 - 286

Abstract

Abstract

The multitude of cloud computing solutions available to users means that when choosing a specific variant of architecture, it is reasonable to consider the technical and functional capacity and security of the solution offered. The complexity of relations and relations in the CC architecture has been validated in conditions close to the real environment. The authors carried out a series of tests taking into account the heterogeneity of modern solutions in the field of interfaces, traffic control and offering services and user devices. The results were subjected to statistical analysis. The conclusions specify the basic observations and set the basic determinants (i.e. safety, quality, effectiveness, etc.) that are the basis for analytical considerations and their practical validation in the test bed.

Keywords

  • cloud computing
  • private cloud
  • reliability
Open Access

Analysis of the User’s Influence on Reliability of Public Cloud Services

Published Online: 29 Oct 2018
Page range: 287 - 304

Abstract

Abstract

Universal access to cloud computing services means that users expect services to be provided in a reliable and secure manner. The availability of newer and more efficient end devices raises the question of whether the mobile device used affects an access reliability. In the article the authors taking into account the type of mobile device (laptop, tablet and smartphone) and the access method (WiFi and LTE) heck what effect the end device on the reliability of access has.

Keywords

  • public cloud
  • user influence
  • reliability
Open Access

Risk Assessment in Road Transport – Strategic and Business Approach

Published Online: 29 Oct 2018
Page range: 305 - 324

Abstract

Abstract

In the presented paper, author focus on the issues related to risk assessment of transport processes performance. The author presented the characteristics of the traditional approach to risk assessment in transport, which is popular in the literature. This approach addresses the strategic risk assessment for the road transport system and it focuses primarily on aspects related to the transport safety. The business approach to risk assessment from the perspective of the managers of the transport process is presented in the next part of the article. In this case, the subject of the analysis is the operational risk, which focuses on the risks affecting the implementation of the transport process and the achievement of the company’s operational objective. The article concludes with a summary, including directions for further research.

Keywords

  • transportation process
  • risk assessment
  • safety
Open Access

Assessment of Road Restraint Systems in Polish Conditions

Published Online: 29 Oct 2018
Page range: 325 - 343

Abstract

Abstract

Key to understanding the needs and tools of road infrastructure management is identifying the hazards and their sources involved in having no or faulty road restraint systems. Clarity is also needed on why the systems are wrongly designed, constructed, built and operated. To ensure that the problem is adequately understood, research and site observations were conducted and mathematical models were built to describe the level of roadside risk. To aid studies of road safety barrier and other road safety equipment functionality, it is vital to carry out field crash tests and crash test simulations. The main goal of the work is to develop a method for selecting optimal road restraint systems.

Keywords

  • road restraint systems
  • road safety
  • roadside
Open Access

Comparative Analysis of V2V and A2A Technologies

Published Online: 29 Oct 2018
Page range: 345 - 364

Abstract

Abstract

In recent years, around the world, there has been work underway on systems, which will increase not only the comfort of traveling but, above all, the safety and reliability of the road traffic. The systems in this field, designed to replace human beings in the future, thus eliminating their mistakes on the road, already have their prototypes. However, these prototypes are still being improved and require a lot of work so they could operate fully and reliably. The subject of the publication is a compilation of two new concepts in the field of Intelligent Transport Systems. These concepts are V2V (Vehicle - to - Vehicle) and A2A (Autonomous vehicle - to - Autonomous vehicle). Their comparison was carried out in terms of functionality, communication, vehicle equipment, legal aspects and the anticipated date of their entry into the market. Also examples of first tests and implementations of vehicles with driver assistance systems, and semi-autonomous vehicles were presented.

Keywords

  • ITS
  • V2V
  • A2A
  • autonomous vehicles
Open Access

Evaluation Criteria for Technical and Teleinformatic Solutions in its Services

Published Online: 29 Oct 2018
Page range: 365 - 383

Abstract

Abstract

Transport telematics systems integrate IT with telecommunications in applications for different transport systems. Through their implementation, the use of transport infrastructure and means of transport increases, while increasing the level of safety of vehicles and facilities performing transport tasks. The implementation of modern Intelligent Transport Systems in road transport necessitates their evaluation (including reliability and operation) and the rational selection for planned criteria. The article presents the author’s work on criteria and sub-criteria that will be used to evaluate technical and teleinformatic solutions for ITS services.

Keywords

  • ITS
  • reliability
  • exploitation process
19 Articles
Open Access

The Idea of Modification of Work Conditions for the Reduction of the Pilot’s Workload in a Glider, Type SZD-30

Published Online: 29 Oct 2018
Page range: 7 - 26

Abstract

Abstract

The paper presents a method for identifying the risk of disorders in the muscular and skeleton system, which would enable an assessment of the load of the motoric system that constitute one of important aspect for ergonomic risk. The result of the research made with use of the RULA method confirms the necessity of an urgent implementation of correcting actions aimed at improving the ergonomics of the pilot’s cabin. Some of them are difficult to put into practice in view to their high costs. One should also remember that the exploitation period is nearly expired so the implementation of improvements does not make much sense. However, there is a possibility of implementing many modifications that do not require high costs and that do not affect significantly the construction of the glider.

Keywords

  • workload of a pilot
  • disorders in the muscular and skeleton system
  • reliability of a pilot
Open Access

Ecological Safety of the Baltic Sea in the Aspects of Corrosive Reprocessing of Containers with Toxic Warfare Agents

Published Online: 29 Oct 2018
Page range: 27 - 44

Abstract

Abstract

Issue of Corrosion of chemical ammunition dumped in Baltic Sea after WW2 is actual because of recent accidents involving contamination of fish, burns of fishermen and uncautious beach – goers by substances released from chemical ammunition show the need of taking counteractions. This poses a question, if extraction of these dangerous cartridges is possible in safe way without unsealing containers and releasing chemical measures into the environment. The aim of this paper is to examine corrosion rate of chemical munitions materials (in mm/year). This rate allows valuation of time period in which chemical containers remain sealed. In addition paper presents analysis of possibility of safe extraction of chemical ammunition without environment contamination.

Keywords

  • corrosion reprocessing
  • toxic warfare agents
  • sea water
  • environmental contamination
Open Access

Models of Airmen’s Aviation Activities Cycles in the Tactical Aircraft’s Operating System

Published Online: 29 Oct 2018
Page range: 45 - 66

Abstract

Abstract

The tactical aircraft’s operating system (system of a tactical aircraft’s operational usage) constitutes the main research area of this paper. The authors consider and look into the airmen’s aviation activities cycles which could be the basis for a clear and coherent indication and description of analyses domains for risk management’s processes in the tactical aircraft’s operating systems (TAOS). The first part of this paper presents the model of airman’s aviation activities cycle (AAAC) which indicates individual airman-aircraft relations during the realization an aircraft’s operator activities that allow to execute air missions. There is also indicated the relationship between the AAAC and the aircraft’s operating cycle (cycle of an aircraft’s operational usage). The second part of this paper presents the model of the series of airmen’s aviation activities cycles (SAAAC) that integrates, among others: models of AAAC, the process of daily air missions’ organizational and technical summary, the process of flight organization’s and air training effects periodic summary.

Keywords

  • air task
  • flight
  • air mission
  • model of airman’s aviation activities cycle
  • model of the series of airmen’s aviation activities cycles
Open Access

The Use of Bluetooth Standard for Communication Between Vehicles Under Traffic

Published Online: 29 Oct 2018
Page range: 67 - 82

Abstract

Abstract

Bluetooth is a type of wireless communication used to transmit voice and data at high speeds using radio waves. It is a standard protocol for short-range radio communications between many different types of devices, including mobile phones, computers and other electronics [1]. The use of this type of data transmission standard for voice communications at close range in the vehicle is commonly known. The trend of integrating new services in vehicles increases rapidly and Bluetooth is one of the emerging communication technologies for realizing ad-hoc networks. The paper presents the possibility of using Bluetooth to build ad-hoc network suitable for the transmission of sound, in particular voice data using the modulation GSFK. We analyzed the features or problems that Bluetooth offers for transmitting audio data in an ad-hoc network. Some initial results of simulations and real-life tests give an impression of the performance and efficiency this standard for the transmission of voice data in an ad-hoc networks [2].

Keywords

  • bluetooth standard
  • communication between vehicles in traffic
  • short-range wireless communication
Open Access

Markov Reliability Model for Heat Meters

Published Online: 29 Oct 2018
Page range: 83 - 96

Abstract

Abstract

The reliability of thermal energy meters is analysed using the Markov model which describes the operation of these meters in a large number of apartments and offices by a media accounting company. The data has been extracted from a relational database storing information on the operation, installation and exchange of these measures from the last 10 years. The built Markov model turned out to be ergodic, which allowed determining its limiting distribution. In addition, the probability distributions for the cumulated consumption were determined in the work - separately for all meters and meters’ failures.

Keywords

  • reliability models
  • Markov model
  • exponential distribution
  • Weibull distribution
Open Access

Accuracy Assessment of Aircraft Positioning by Using the DGLONASS Method in the GBAS System

Published Online: 29 Oct 2018
Page range: 97 - 124

Abstract

Abstract

The paper presents the accuracy results of aircraft positioning using the DGLONASS method in the GBAS augmentation system in air transport. In the research test, the coordinates of Cessna 172 aircraft were recovered on the basis of the DGLONASS technique. The calculations were executed in RTKLIB software in RTKPOST library in module “DGPS/DGNSS”. The raw GLONASS data from the onboard Topcon HiperPro receiver and also from the REF1 physical reference station were utilized in the research test. In the paper, the standard deviations of aircraft coordinates and integrity HPL and VPL parameters were presented and described. In the paper, the obtained aircraft coordinates from the DGLONASS method were compared and verified with the DGPS solution. For this purpose, the RMS-3D term and difference of ellipsoidal height of aircraft were estimated in the paper. The average value of RMS-3D equals to 1.71 m, however the difference of ellipsoidal height amounts to 1.46 m, respectively.

Keywords

  • GLONASS
  • ICAO
  • GBAS system
  • accuracy
  • integrity
Open Access

The Use of a Fuzzy Logic to Eliminate an Error in Measuring the Flight Altitude of the W-3 „Sokół” Helicopter

Published Online: 29 Oct 2018
Page range: 125 - 141

Abstract

Abstract

Along with the growing technology, helicopters are equipped with increasingly complex avionics and operational control systems. Such devices use a variety of input signals in order to enhance their performance. Owing to the use of electronic control systems, modern helicopters have a wide range of possibilities, both in terms of manoeuvrability and combat. The article presents a case study of designing equipment control systems on the example of a radio altimeter, which is mounted onboard the W-3 “Sokół” helicopter. The primary assumption was to design a fuzzy controller using FuzzyLogic Toolbox in the Matlab software package that will facilitate similar results, and, above all, will eliminate the altitude measurement error resulting from the bank of a helicopter.

Keywords

  • radio altimeter
  • Fuzzy Logic
  • helicopter W-3 „Sokół”
Open Access

Hardware Protections Increasing the Reliability of a Prototype Inverter Welder

Published Online: 29 Oct 2018
Page range: 143 - 163

Abstract

Abstract

The subject of the paper is a presentation of hardware protections, which increase the reliability of a prototype inverter welder. Under certain assumptions, the constructed device may be classified to a group containing objects with a serial reliability structure. As a result, the functionality of the inverter welder is provided, when all components (sub-assemblies) operate correctly. The paper presents the results of simulations, which confirm the essence of using each of the hardware protections. The tests were conducted using the ICAP/4 software by Intusoft.

Keywords

  • inverter welder
  • hardware protections
  • pulse systems
Open Access

Laboratory Station for Reliability Testing of Digital Circuits Using Signature Analysis

Published Online: 29 Oct 2018
Page range: 165 - 182

Abstract

Abstract

The article presented a laboratory station for diagnosing the digital circuits and the test results on the basis of a selected example. The idea of a response compression technique, which is called an analysis of signatures, was demonstrated. The main element of the station includes 8-bit programme of an analyser of signatures, which was developed by the authors, and implemented in the LabVIEW environment with the use of NI 6008 data analysis module. The programme operation was tested on the selected digital circuit, and the obtained results were provided in the article.

Keywords

  • signature analysis
  • diagnosis of digital systems
Open Access

Impact of Prosthetic Materials Manufacturing Process on the Reliability of Dentures

Published Online: 29 Oct 2018
Page range: 183 - 199

Abstract

Abstract

The paper presents a method of testing dental alloys used to produce frame dentures. The material constants stated by the manufacturers of dental alloys were verified. The impact of presented discrepancies on the durability and reliability of a frame denture was discussed.

Keywords

  • dental materials
  • materials tests
  • denture modelling
  • denture reliability
Open Access

Assessment of Durability of the Rail Vehicle Components with the Use of Degradation Analysis Method

Published Online: 29 Oct 2018
Page range: 199 - 224

Abstract

Abstract

An important issue during the operation of rail vehicles is the dynamics of forced loads. The identification of these workloads and the evaluation of their impact on the reliability and durability of the structure is essential for maintaining the safety of operation. For this reason, an important issue in the assessment of durability is to identify potential hazards that cause object failure. This paper presents the results of fatigue tests for the selected structure of a rail bogie. The results were then used to conduct the Degradation Analysis of the object. The purpose of this analysis was to estimate the real values of the durability and reliability indicators of the bogie frame from the point of view of the safety of its operation.

Keywords

  • degradation analysis
  • reliability assessment
  • railway boogie
Open Access

Optimisation of the Municipal Waste Collection Process in a Small Size and Scarcely Populated Municipality

Published Online: 29 Oct 2018
Page range: 227 - 246

Abstract

Abstract

The paper presents a review of legal conditions regarding the process of municipal waste collection. An analysis of systems and solutions for the management and monitoring of a fleet of vehicles that can be used in the operation of means of transport during the implementation of the municipal waste process was carried out. The paper presents a coherent concept of ICT system for the optimization of the municipal waste collection process in a small-sized municipality. The proposed system can be used by companies responsible for waste collection, transport and service companies participating in the waste collection process.

Keywords

  • exploitation
  • optimization
  • receiving of waste
Open Access

Numerical Simulation of the Process of a Technical Object State Changes

Published Online: 29 Oct 2018
Page range: 247 - 266

Abstract

Abstract

The article presents a construction method and an example of a model of a technical object operation process as well as the main stochastic assumption which is a mathematical model of an object state changes. The model of the operation process was built using an analysis of the state space and operation-related events of the analyzed technical objects. An example of numerical simulation of the technical object state change process as a tool to be used to support the analysis of the considered process. Numerical simulation of the stochastic process being a model of a technical object state change process makes it possible to determine the process characteristics impossible to determine in an analytical way.

Keywords

  • numerical simulation
  • operation process
  • stochastic process
  • object state
  • operation-related state
Open Access

Private Cloud Architecture - Analysis of Reliability

Published Online: 29 Oct 2018
Page range: 267 - 286

Abstract

Abstract

The multitude of cloud computing solutions available to users means that when choosing a specific variant of architecture, it is reasonable to consider the technical and functional capacity and security of the solution offered. The complexity of relations and relations in the CC architecture has been validated in conditions close to the real environment. The authors carried out a series of tests taking into account the heterogeneity of modern solutions in the field of interfaces, traffic control and offering services and user devices. The results were subjected to statistical analysis. The conclusions specify the basic observations and set the basic determinants (i.e. safety, quality, effectiveness, etc.) that are the basis for analytical considerations and their practical validation in the test bed.

Keywords

  • cloud computing
  • private cloud
  • reliability
Open Access

Analysis of the User’s Influence on Reliability of Public Cloud Services

Published Online: 29 Oct 2018
Page range: 287 - 304

Abstract

Abstract

Universal access to cloud computing services means that users expect services to be provided in a reliable and secure manner. The availability of newer and more efficient end devices raises the question of whether the mobile device used affects an access reliability. In the article the authors taking into account the type of mobile device (laptop, tablet and smartphone) and the access method (WiFi and LTE) heck what effect the end device on the reliability of access has.

Keywords

  • public cloud
  • user influence
  • reliability
Open Access

Risk Assessment in Road Transport – Strategic and Business Approach

Published Online: 29 Oct 2018
Page range: 305 - 324

Abstract

Abstract

In the presented paper, author focus on the issues related to risk assessment of transport processes performance. The author presented the characteristics of the traditional approach to risk assessment in transport, which is popular in the literature. This approach addresses the strategic risk assessment for the road transport system and it focuses primarily on aspects related to the transport safety. The business approach to risk assessment from the perspective of the managers of the transport process is presented in the next part of the article. In this case, the subject of the analysis is the operational risk, which focuses on the risks affecting the implementation of the transport process and the achievement of the company’s operational objective. The article concludes with a summary, including directions for further research.

Keywords

  • transportation process
  • risk assessment
  • safety
Open Access

Assessment of Road Restraint Systems in Polish Conditions

Published Online: 29 Oct 2018
Page range: 325 - 343

Abstract

Abstract

Key to understanding the needs and tools of road infrastructure management is identifying the hazards and their sources involved in having no or faulty road restraint systems. Clarity is also needed on why the systems are wrongly designed, constructed, built and operated. To ensure that the problem is adequately understood, research and site observations were conducted and mathematical models were built to describe the level of roadside risk. To aid studies of road safety barrier and other road safety equipment functionality, it is vital to carry out field crash tests and crash test simulations. The main goal of the work is to develop a method for selecting optimal road restraint systems.

Keywords

  • road restraint systems
  • road safety
  • roadside
Open Access

Comparative Analysis of V2V and A2A Technologies

Published Online: 29 Oct 2018
Page range: 345 - 364

Abstract

Abstract

In recent years, around the world, there has been work underway on systems, which will increase not only the comfort of traveling but, above all, the safety and reliability of the road traffic. The systems in this field, designed to replace human beings in the future, thus eliminating their mistakes on the road, already have their prototypes. However, these prototypes are still being improved and require a lot of work so they could operate fully and reliably. The subject of the publication is a compilation of two new concepts in the field of Intelligent Transport Systems. These concepts are V2V (Vehicle - to - Vehicle) and A2A (Autonomous vehicle - to - Autonomous vehicle). Their comparison was carried out in terms of functionality, communication, vehicle equipment, legal aspects and the anticipated date of their entry into the market. Also examples of first tests and implementations of vehicles with driver assistance systems, and semi-autonomous vehicles were presented.

Keywords

  • ITS
  • V2V
  • A2A
  • autonomous vehicles
Open Access

Evaluation Criteria for Technical and Teleinformatic Solutions in its Services

Published Online: 29 Oct 2018
Page range: 365 - 383

Abstract

Abstract

Transport telematics systems integrate IT with telecommunications in applications for different transport systems. Through their implementation, the use of transport infrastructure and means of transport increases, while increasing the level of safety of vehicles and facilities performing transport tasks. The implementation of modern Intelligent Transport Systems in road transport necessitates their evaluation (including reliability and operation) and the rational selection for planned criteria. The article presents the author’s work on criteria and sub-criteria that will be used to evaluate technical and teleinformatic solutions for ITS services.

Keywords

  • ITS
  • reliability
  • exploitation process

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