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11.
Impact of commercial motorcycle operation on urban mobility in Ogun State, Nigeria
Oluwaseyi Joseph Afolabi, Kolawole Taofeek Gbadamosi, 2017, izvirni znanstveni članek

Opis: The significant of public transport of cities in many developing countries lies in the fundamental fact that mobility and accessibility are essential for economic growth and of necessity to provide efficient and effective movement for goods and services. The collapse of public intra-city transport system paved way for the rise of motorcycles as means of public transportation in Nigeria. This paper discusses the impact of commercial motorcycle operation as a means of urban transportation. Of the 200 questionnaires administered, 191 questionnaires were received for analysis using the Statistical Package for Social Sciences (SPSS). Secondary data was also sourced to serve as complement to the primary data, thus allowing for a robust research. Descriptive statistical tools such as percentages were adopted to present the socio - economic characteristics in the area. Findings showed that the majority of the users are adult between the aged 31 and 40 years. Most of them (53.8%) are married and are fairly educated. Furthermore, it was recommended that the Nigerian government should provide employment opportunities for our teeming youth as this will go a long way in the reduction of number of youth who as a result of unemployment took to motorcycle riding business.
Ključne besede: transportation, traffic, motorcycle, Ogun State
Objavljeno: 17.11.2017; Ogledov: 16; Prenosov: 1
.pdf Polno besedilo (196,17 KB)

12.
From effective accounting and reporting to efficient outsourcing
Daria Meyr, 2014, izvirni znanstveni članek

Opis: This study aims to identify an effective management accounting and reporting concept for efficient outsourcing performance in sustainable organizations. Existing reporting norms of the “Systemanalyse und Programmentwicklung (SAP)” platform, used in JSC "Russian Railways" (further Russian Railways) were analysed. Thereby, in the paper a method of the formation of internal management accounting and reporting on the costs of outsourcing were developed. Currently, the analysis of the reports and effectiveness of outsourcing is based on the technique comparison “costs on outsourcing should be less than the cost of own units”. Effective analysis should include not one, but several factors and be based on multi-criteria approach. The main influence on the variation of such determinants as cost, productivity and staff members outsourcing has when the volume of production and prices are constant. According to the features of railway transport enterprises, existing method has been completed with statistical. It shows how outsourcing changed the performance of the company and by what factors - the average cost, or productivity, or staffing or due to variations of all three factors simultaneously. Further, the results of quantitative data analysis will be used to identify an effective management accounting in sustainable organizations while supporting the development of outsourcing.
Ključne besede: outsourcing, cost accounting, managerial reporting, railway transport
Objavljeno: 17.11.2017; Ogledov: 17; Prenosov: 1
.pdf Polno besedilo (246,14 KB)

13.
For safety and security reasons
Alexander Zuepke, Kai Beckmann, Andreas Zoor, Reinhold Kroeger, 2016, izvirni znanstveni članek

Opis: The current development trend of Internet of Things (IoT) aims for a tighter integration of mobile and stationary devices via various networks. This includes communication of vehicles to roadside infrastructure (V2I), as well as intelligent sensors / actors in Logistics and smart home environments. Compared to isolated traditional embedded systems, the exposure to open networks increases the attack surface, and errors in the networking components could compromise the safety and security of the embedded application or the whole network. But often current system architectures for mass-market IoT devices lack the required isolation concepts. Using a partitioning microkernel and enforcing the use of a microcontroller’s memory protection unit (MPU) facilities, we compare different isolation concepts for a publish/subscribe middleware implementing OMG’s Data Distribution Service (DDS) standard and we evaluate our results on an STM32F4 microcontroller. The results of this case study show moderate costs for increased memory usage and additional context switches.
Ključne besede: component-isolation, microkernel, partitioning, IoT
Objavljeno: 17.11.2017; Ogledov: 11; Prenosov: 0
.pdf Polno besedilo (456,12 KB)

14.
Factors influencing passengers’ choice of transport mode to Warsaw Chopin Airport
Aleksandra Górecka, 2016, izvirni znanstveni članek

Opis: Airport accessibility is an important factor for airport choice and therefore also for airport competition. When air passengers choose an itinerary, they reflect on the transport chain from door to door. Therefore, factors affecting the traveller’s decision for a particular option go beyond the price and quality of air services from airport to airport. The decision for or against a particular air service and a particular airport is to a certain extent dependent on the accessibility of the airport. The aim of the article is to present the preliminary research of factors which influence choice of transport mode used in order to reach Warsaw Chopin Airport (WAW). The hypothesis of the paper is that the most common transport modes to WAW is private transport. The data were collected based on survey distributed within passengers in May 2015. The results show that there is a relation between flight destination from WAW and distance from the point of origin to airport and also between kind of traveller and transport mode used by his/her. There is also the conclusion that the most common transport modes from and to the airport in Europe is used very rarely in Warsaw.
Ključne besede: airport, accessibility, transport modes, Warsaw Chopin Airport
Objavljeno: 17.11.2017; Ogledov: 13; Prenosov: 1
.pdf Polno besedilo (500,08 KB)

15.
Estimating truck operating costs for domestic trips
Eleftherios Sdoukopoulos, Maria Boile, Afroditi Anagnostopoulou, 2015, izvirni znanstveni članek

Opis: The transport sector represents a vital component of national economies and has significant impacts on productivity and social welfare. In 2012, the transport sector in Europe was estimated to account for 3.7% of the European Gross Domestic Product (GDP) and 5.1% for employment. Road transport proves to be the predominant mode for moving goods within Europe holding a share of approximately 45.8% in 2012 (in ton-kms). In Greece, the share of road freight transport is significantly higher (98%) indicating the importance of this sector for the Greek economy. To this end and considering the existing needs of road freight transport operators in Greece, the objective of this research is to establish an analytical and documented basis for estimating the operating cost of a truck on specific urban or national freight transport routes. To achieve this goal, an extended literature review has been conducted resulting in the identification of the main components comprising the total truck operating cost, which were then updated and validated through a series of personal interviews with selected road freight transport professionals. An excel-based application tool was also developed in order to facilitate operating cost estimates for different cases, through selection of the proper values of the relevant parameters. The resulting tool was used to analyse four test cases, which demonstrate the tool’s usability and applicability. Results from this analysis have been also validated by industry experts and they reflect real-world transport scenarios.
Ključne besede: cost calculation tool, road freight transport, truck operating costs
Objavljeno: 17.11.2017; Ogledov: 11; Prenosov: 0
.pdf Polno besedilo (339,45 KB)

16.
Characteristics of logistics outsourcing in Bulgaria
Miroslava Rakovska, 2016, izvirni znanstveni članek

Opis: The increased demand and supply of logistics services bring together the logistics service providers (LSPs) and the companies that outsource logistics activities. LSPs stand in between those companies and their customers, thus playing an essential role for supply chain integration. If the two parties have different viewpoints of the processes in the supply chain, the fulfillment of the goal to satisfy the end customers may be hindered. The purpose of this article is two-fold: First, to investigate the characteristics of logistics outsourcing in Bulgaria from the perspectives of the logistics service providers and their customers, and more specifically, to compare their viewpoints concerning the motives for outsourcing, the methods and contents of communication and some relationship management aspects; Second, to assess the relations of the communication and relationship management aspects to customer satisfaction. This article is based on empirical data provided by 138 manufacturing and trading companies and 136 LSPs and collected through two structured questionnaires designed to address the researched issues. The data were analyzed using descriptive statistics and the independent samples t-test. The research found that the service related reasons for logistics outsourcing are prevailing and that LSPs overestimate, compared to manufacturing and trading companies, motives related to service, organizational capabilities and relationships, while more manufacturing and trading companies concern as important the availability of logistics assets and the provision of value-added services. The research also found that both the LSPs and their customers consider that the extent of sharing of knowledge and information essential for material flow integration is very low and that the usage of team meetings and joint teams is quite rare. Also, customers do not view their relationships with the LSPs as so collaborative as viewed by the LSPs. Furthermore, the research proved the existence of positive relationships between customer satisfaction and communication through team meetings and joint teams, knowledge sharing concerning material flow management and relationship management issues such as trust, mutual problem solving, understanding the logistics strategy of the other party and respecting its financial interests. The research findings may help fill in some of the gaps between LSPs and their customers. They point the need for LSPs to include in their service offerings more value-added services and to invest in assets that provide reliable and flexible services for their customers. The research also highlights the importance of knowledge sharing and trust building and reveals great potential for effective trust-based alliances between LSPs and their customers that could help them extract more competitive benefits from their relationships.
Ključne besede: logistics outsourcing, logistics service providers, outsourcing motives, communication, relationship management
Objavljeno: 17.11.2017; Ogledov: 10; Prenosov: 0
.pdf Polno besedilo (385,28 KB)

17.
Accessibility concepts and indicators in transportation strategic planning issues
Ana Vulevic, 2016, izvirni znanstveni članek

Opis: Accessibility is a well-known and studied concept within the scientific literature. Good transportation accessibility is certainly an important factor in exploiting spatial potentials. The quality of transportation infrastructure in terms of capacity, travel speed, connectivity etc., determines the quality and advantage of a location relative to other locations, which is usually measured as accessibility. Increasingly overloaded transport corridors, in the context of changing transportation flows are becoming an important issue for accessibility. This Paper gives a very brief overview of which kind of transportation networks and services indicators should be used in relevant documents and in transportation planning practice. This Paper provides a comprehensive overview of the different definitions, dimensions and indicators of accessibility in the literature of those already discovered.
Ključne besede: accessibility indicators, accessibility, transportation network and services indicators
Objavljeno: 17.11.2017; Ogledov: 12; Prenosov: 0
.pdf Polno besedilo (497,67 KB)

18.
A framework for use in modelling the modal choice decision making process in North West England’s Atlantic Gateway
Alan Bury, Dimitrios Paraskevadakis, Jun Ren, Farhan Saeed, 2017, izvirni znanstveni članek

Opis: The task of producing a generic model of the modal choice decision making process is a challenging one. Modal choice is strongly influenced by the infrastructure limitations and geographical constraints of the area in which the decision is being made. With this in mind, addressing modal choice on an individual basis for each region may be the optimal solution. This is the approach adopted in this paper. The creation of a modal choice model is a multistage process of which this paper addresses the first stage, the production a framework of the decision making process. Firstly, a number of criteria that are commonly used in modal choice models are identified. Then a number of gaps in the criteria utilized in previous papers are established. Subsequently, the method used to produce a framework of the decision making process within North West England’s Atlantic Gateway is outlined. Through consultation with transport industry experts in North West England, an initial list of sixty eight papers was reduced to thirty six that were considered to be of specific relevance to modern day freight transportation within their region. The criteria used in each of these papers were then, along with further industry input, used to create the foundation on which a modal choice framework specific to the Atlantic Gateway could be built. A greater understanding of what influences modal choice within this region will allow informed decisions to be made by policy makers on how to more efficiently utilize the available modes of freight transport. Having established this, future work can then go on to build upon these findings. This paper recommends that future work is performed to establish the weights of each criteria and sub-criteria within the framework. This should then be followed by establishing industry’s perceptions of the best and worst alternatives for moving freight within the Atlantic Gateway.
Ključne besede: freight transport, modal choice, northern powerhouse, Atlantic Gateway, North West England
Objavljeno: 17.11.2017; Ogledov: 11; Prenosov: 0
.pdf Polno besedilo (170,75 KB)

19.
Heuristics for NP-hard optimization problems
Janez Žerovnik, 2015, izvirni znanstveni članek

Opis: We provide several examples showing that local search, the most basic metaheuristics, may be a very competitive choice for solving computationally hard optimization problems. In addition, generation of starting solutions by greedy heuristics should be at least considered as one of very natural possibilities. In this critical survey, selected examples discussed include the traveling salesman, the resource-constrained project scheduling, the channel assignment, and computation of bounds for the Shannon capacity.
Ključne besede: optimization, metaheuristics, local search, greedy construction, traveling salesman problem
Objavljeno: 17.11.2017; Ogledov: 9; Prenosov: 0
.pdf Polno besedilo (709,68 KB)

20.
Synergistic chemo-enzymatic hydrolysis of poly (ethylene terephthalate) from textile waste
Felice Quartinello, Simona Vajnhandl, Julija Volmajer Valh, Thomas Farmer, Bojana Vončina, Aleksandra Lobnik, Enrique Herrero Acero, Alessandro Pellis, Georg M. Gübitz, 2017, izvirni znanstveni članek

Opis: Due to the rising global environment protection awareness, recycling strategies that comply with the circular economy principles are needed. Polyesters are among the most used materials in the textile industry; therefore, achieving a complete poly(ethylene terephthalate) (PET) hydrolysis in an environmentally friendly way is a current challenge. In this work, a chemo-enzymatic treatment was developed to recover the PET building blocks, namely terephthalic acid (TA) and ethylene glycol. To monitor the monomer and oligomer content in solid samples, a Fourier-transformed Raman method was successfully developed. A shift of the free carboxylic groups (1632 cm$^{−1}$) of TA into the deprotonated state (1604 and 1398 cm$^{−1}$) was observed and bands at 1728 and 1398 cm$^{−1}$ were used to assess purity of TA after the chemo-enzymatic PET hydrolysis. The chemical treatment, performed under neutral conditions (T = 250 °C, P = 40 bar), led to conversion of PET into 85% TA and small oligomers. The latter were hydrolysed in a second step using the Humicola insolens cutinase (HiC) yielding 97% pure TA, therefore comparable with the commercial synthesis-grade TA (98%).
Ključne besede: textile waste, waste recycling
Objavljeno: 16.11.2017; Ogledov: 15; Prenosov: 0
.pdf Polno besedilo (304,48 KB)

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