2015, VOLUME 16 #3. "TRANSPORT AND TELECOMMUNICATION". ЖУРНАЛ ИЗДАТЕЛЬСТВА TSI, ISSN 1407-6160, ISSN 1407-6179 | TSI

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2015, VOLUME 16 #3. "TRANSPORT AND TELECOMMUNICATION". ЖУРНАЛ ИЗДАТЕЛЬСТВА TSI, ISSN 1407-6160, ISSN 1407-6179

EARLY 2015 PERFORMANCE IN BALTIC SEA PORTS: FORECASTS OF ESTONIAN PERFORMANCE FOR ENTIRE YEAR 

Olli-Pekka Hilmola1, Andres Tolli2

1 Lappeenranta University of Technology

Kouvola Unit, Prikaatintie 9, FIN-45100 Kouvola, Finland
Fax: +358 5 344 4009, E-mail: olli-pekka.hilmola@lut.fi
2 Tallinn University of Technology, Estonian Maritime Academy
Kopli 101, 11712 Tallinn
Phone: +372 50 71 899, e-mail: andres.tolli@ttu.ee

Many changes have appeared in year 2015. In Europe economic malaise has continued since debt crisis started in year 2010,

and although its effects on Northern Europe have started to diminish, new economic dark clouds have appeared through sanctions set
by both European Union and Russia to each other during year 2014. Together with these, shipping sector has been under pressure due
to strict sulphur regulation implemented from early 2015 onwards in the entire Baltic Sea Region. Due to these factors, sea ports at
Baltic Sea have been under pressure during the first months of 2015, this particularly concerning container handling. Based on our
regression model forecast, Estonia and Port of Tallinn shall have clearly declining container handling year ahead. However, overall
handling at sea port is not so easy to forecast.
Keywords: Baltic Sea, crisis, sea ports, handling, TEU

MIXED VEHICLE FLOW AT SIGNALIZED INTERSECTION: MARKOV CHAIN ANALYSIS 

Ilya B. Gertsbakh

Department of Mathematics, Ben Gurion University, Israel

E-mail: elyager@bezeqint.net

We assume that a Poisson flow of vehicles arrives at isolated signalized intersection, and each vehicle, independently of

others, represents a random number X of passenger car units (PCU’s). We analyze numerically the stationary distribution of the queue
process {Zn}, where Zn is the number of PCU’s in a queue at the beginning of the n-th red phase, n → ∞. We approximate the number
Yn
of PCU’s arriving during one red-green cycle by a two-parameter Negative Binomial Distribution (NBD). The well-known fact is
that {Zn} follow an infinite-state Markov chain. We approximate its stationary distribution using a finite-state Markov chain. We
show numerically that there is a strong dependence of the mean queue length E[Zn] in equilibrium on the input distribution of Yn and,
in particular, on the ”over dispersion” parameter =ߛVar[Yn]/E[Yn]. For Poisson input, = ߛ1. > ߛ1 indicates presence of heavy-tailed
input. In reality it means that a relatively large ”portion” of PCU’s, considerably exceeding the average, may arrive with high
probability during one red-green cycle. Empirical formulas are presented for an accurate estimation of mean queue length as a function
of load and g of the input flow. Using the Markov chain technique, we analyze the mean ”virtual” delay time for a car which always
arrives at the beginning of the red phase.
Keywords: signalized traffic light, Markov chain, average queue length, mixed vehicle input flow, negative binomial distribution,
over dispersed input, virtual delay

USERS’ PERCEPTION AND REPORTED EFFECTS OF LONGTERM ACCESS TO IN-VEHICLE TRAFFIC INFORMATION SERVICES MEDIATED THROUGH NOMADIC DEVICES 

Tor Skoglund, Pontus Wallgren, MariAnne Karlsson, Stig Franzén

Chalmers University of Technology, Dep. Product and Production Development,

Division Design & Human Factors
SE-41296 Gothenburg, Sweden
Phone: +46 31 7721397, e-mail: pontus.wallgren@chalmers.se

ICT-mediated traffic information has been argued to contribute to a more sustainable transport system through affecting

drivers. Nevertheless, long-term effects of travellers having access to nomadic in-vehicle systems for traveller information are not
well known. This study presents the results from a multi-national large-scale field operational test (FOT). The results show that the
users in general were positive to the tested systems and that there were several effects on their driving behaviour but in many cases
the effects were limited. Moreover the effects varied between system types. Positive effects were related to comfort, as well as
individual and system efficiency. One could also notice that perceived effects were not as high as the participants had expected,
leading to some disappointment. Most of the times this was due to the tested systems functioning in a less than optimal way.
Keywords: field operational test, traffic information, nomadic device

FORMAL AND INFORMAL MACRO-REGIONAL TRANSPORT CLUSTERS AS A PRIMARY STEP IN THE DESIGN AND IMPLEMENTATION OF CLUSTER-BASED STRATEGIES

Olga Nežerenko1, Ott Koppel2

1Department of Business Administration, Tallinn School of Economics and Business Administration,

Tallinn University of Technology
Tallinn, 12618, Akadeemia tee 3, Estonia
Phone: +3725264686, e-mail: olga.nezerenko@gmail.com
2Department of Logistics and Transport, Faculty of Civil Engineering, Tallinn University of Technology
Tallinn 12616, Akadeemia tee 15a, Estonia
Phone: +372 62 02 605, e-mail: ott.koppel@ttu.ee

The aim of the study is the identification of a formal macro-regional transport and logistics cluster and its development trends

on a macro-regional level in 2007-2011 by means of the hierarchical cluster analysis. The central approach of the study is based on
two concepts: 1) the concept of formal and informal macro-regions, and 2) the concept of clustering which is based on the similarities
shared by the countries of a macro-region and tightly related to the concept of macro-region. The authors seek to answer the question
whether the formation of a formal transport cluster could provide the BSR a stable competitive position in the global transportation
and logistics market.
Keywords: Baltic Sea Region (BSR), hierarchical cluster analysis (statistics), location quotient, macro-region, transport and logistics

EMPLOYMENT OF IGBT-TRANSISTORS FOR BIPOLAR IMPULSED MICRO-ARC OXIDATION 

Alexander Krainyukov1, Valery Kutev2

Telematics and Logistics Institute,

Lomonosova street 1, Riga, LV-1019, Latvia
Phone:+371 67100634, fax: +371 67100660
E-mail: 1Krainukovs.A@tsi.lv, 2Kutevs.V@tsi.lv

The paper is devoted to the use of insulated gate bipolar transistors (IGBT) for the micro-arc oxidation (MAO) process. The

technical requirements to the current switches of power supplies for the pulsed bipolar MAO technology have been developed. The
research installation for investigating the IGBT commutation processes during the pulse anode-cathode oxidation has been
constructed. The experiments have been performed with its help in order to estimate the possibility of using half-bridge IGBT-modules
with different drivers. The research results of the commutation processes investigation for different IGBT half- bridge modules are presented.
Kеywords: micro-arc oxidation, insulated gate bipolar transistors, high voltage, commutation process, ballast resistance

NEW SOLUTIONS BASED ON WIRELESS NETWORKS FOR DYNAMIC TRAFFIC LIGHTS MANAGEMENT: A COMPARISON BETWEEN IEEE 802.15.4 AND BLUETOOTH

Mario Collotta1, Giovanni Pau2

Faculty of Engineering and Architecture
Kore University of Enna, Cittadella Universitaria, 94100 Enna, Italy
E-mails: 1mario.collotta@unikore.it; 2giovanni.pau@unikore.it

The Wireless Sensor Networks are widely used to detect and exchange information and in recent years they have been

increasingly involved in Intelligent Transportation System applications, especially in dynamic management of signalized intersections.
In fact, the real-time knowledge of information concerning traffic light junctions represents a valid solution to congestion problems.
In this paper, a wireless network architecture, based on IEEE 802.15.4 or Bluetooth, in order to monitor vehicular traffic flows near
to traffic lights, is introduced. Moreover, an innovative algorithm is proposed in order to determine dynamically green times and phase
sequence of traffic lights, based on measured values of traffic flows. Several simulations compare IEEE 802.15.4 and Bluetooth
protocols in order to identify the more suitable communication protocol for ITS applications. Furthermore, in order to confirm the
validity of the proposed algorithm for the dynamic management of traffic lights, some case studies have been considered and several
simulations have been performed.
Keywords: wireless sensor networks; road monitoring; traffic lights; intelligent transportation systems

THE VARIANT APPROACH TO THE OPTIMIZATION OF THE POSTAL TRANSPORTATION NETWORK IN THE CONDITIONS OF THE SLOVAK REPUBLIC  

Radovan Madleňák1, Lucia Madleňáková2, Jozef Štefunko3

1University of Zilina, Zilina, Slovakia,

++412/41/5133124, radovan.madlenak@fpedas.uniza.sk
2University of Zilina, Zilina, Slovakia,
++412/41/5133125, lucia.madlenakova@fpedas.uniza.sk
3University of Zilina, Zilina, Slovakia,
++412/41/5133144, jozef.stefunko@fpedas.uniza.sk

The optimizing process of the postal transportation network can be based on several variables and on different infrastructures.

The most commonly used variables for optimization are time and distance. This article is focused on the comparison of the results of
the optimization process based on the time and distance variables in the conditions of the Slovak national postal operator.
The different types of the underlying infrastructures (roads or railways) could be used for optimization based on the territory
conditions. For the optimization, there has been used the p-median method, that describes the problem of locating P "facilities" relative
to a set of "customers" in such a way that the sum of the shortest demand weighted distance between "customers" and "facilities" is
minimized.
In the conclusion, the article authors will formulate the rule for selection of the best optimization variables for the postal
transportation network optimization.
Keywords: optimization, postal transportation network, distance, time, infrastructure, p-median
 

 

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