JournalTOCs

International Journal of e-Navigation and Maritime Economy
Number of Followers: 5

This is an Open Access Journal

Open Access journal
ISSN (Print) 2405-5352
Published by Elsevier

[3203 journals]

Evaluating Wave Random Path Using Multilevel Monte Carlo
- Authors: Behrouz Fathi-Vajargah; Ayoob Salimipour
  Pages: 1 - 10
  Abstract: Publication date: June 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 7
  Author(s): Behrouz Fathi-Vajargah, Ayoob Salimipour
  Wind waves are important due to their high energy and impact on marine activities. This phenomenon is affects directly or indirectly the construction of coastal infrastructure, shipping and recreational activities. Due to the issues presented, marine parameters are very important. In this study, we try to pay attention to wave as one of the most important marine parameters. As the movements of waves have high uncertainty, financial models can be used to simulate the wave's paths. We use the Monte Carlo method for this purpose. The Monte Carlo simulation is a flexible and simple tool that is widely used in the evaluation of random paths. To compute a random path, we require an integral discretization. In this paper, we study the valuation of European options using Monte Carlo simulation and then compare this result with multi-level Monte Carlo approach and other antithetic variables. Then, we use the multi-level Monte Carlo approach proposed by (M. B. Giles, 2008) for pricing under the two-factor stochastic volatility model. We show that the multi-level Monte Carlo method reduces the computational complexity and also cost of the two-factor stochastic volatility model when compared with the standard Monte Carlo method. Also, we compare the multi-level Monte Carlo method and standard Monte Carlo method using an Euler discretization scheme and then, analyze the numerical results.
  
  PubDate: 2017-07-21T00:56:29Z
  DOI: 10.1016/j.enavi.2017.06.001
  Issue No: Vol. 7 (2017)
The Utilisation of Pisang Island as a Platform to Support the Current
Safety and Security Needs of Marine Navigation in the Straits of Malacca
- Authors: Ahmad Faizal Ahmad Fuad; Mohd Sharifuddin Ahmad; Mohd Naim Fadzil; Noor Apandi Osnin
  Pages: 11 - 18
  Abstract: Publication date: June 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 7
  Author(s): Ahmad Faizal Ahmad Fuad, Mohd Sharifuddin Ahmad, Mohd Naim Fadzil, Noor Apandi Osnin
  Current marine navigational practice relies less on long-range visual marine signals such as lighthouses for reference purposes. This is due to the availability of Global Navigation Satellite Systems (GNSS), which are integrated with other navigational aids on ships. Therefore, the objective of this study is to review the function of Pisang Island lighthouse and to propose the most relevant use of Pisang Island for current navigational needs. The function of the lighthouse was reviewed according to the IALA Navigational Guide and the AIS data image. The result showed that the most suitable navigational use of the lighthouse is to act as a reference for Line of Position (LOP). The AIS data image indicated that mariners are not using Pisang Island lighthouse for LOP. The trend in the Straits of Malacca (SoM) was compared with the trend in the Straits of Dover, UK. The selected experts verified that LOP was not practised there. As a specific example, a tanker ship route in the South China Sea was used to further support that LOP was not practised. This evidence supported the view that Pisang Island lighthouse is less relevant for current navigational practice and does not directly support the coastal state VTS operation and the establishment of the marine electronic highway. Furthermore, the existing shore-based VTS radar has limitations on range and the detection of targets near Pisang Island. Therefore, this study proposes the establishment of a new radar station on Pisang Island at the existing site of the lighthouse. The proposed new radar station on Pisang Island will add to the existing coverage of the VTS radar, bridging the coverage gaps to overcome the weakness of the existing shore-based radar and improve the safety and security of marine navigation in the SoM.
  
  PubDate: 2017-07-21T00:56:29Z
  DOI: 10.1016/j.enavi.2017.06.002
  Issue No: Vol. 7 (2017)
Preparation of dry ports for a competitive environment in the container
seaport system: A process benchmarking approach
- Authors: J. Jeevan; NHM. Salleh; K.B Loke; A.H. Saharuddin
  Pages: 19 - 33
  Abstract: Publication date: June 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 7
  Author(s): J. Jeevan, NHM. Salleh, K.B Loke, A.H. Saharuddin
  The significant exodus of containers inland due to the container revolution has increased the salience of inland terminals for efficient freight distribution. Further, the migration of containers gradually inland has forced seaports to depend on these inland terminals to determine their competitiveness and offer a mechanism for competitive freight price to the consumer. The performance of dry ports need to be improved along with the dynamic nature of maritime business, to efficiently fulfil the demand all the key players in the container seaport system, provide economies of scale and scope to their respective clients and enhances the importance of inland networks to improve and consistently elongate the competitiveness of container seaports. Predicated to these importance, this paper aims to enhance dry port performance by adapting a process benchmarking strategy among the Malaysian dry ports. Prior to the adaptation of the process benchmarking approach, a grounded theory had been conducted as a method of analysis among the key players of the Malaysian container seaport system in order to provide essential inputs for the benchmarking. Through this paper, the outcome shows all four Malaysian dry ports need to improve their transportation infrastructure and operation facilities, container planning strategy, competition, location and externalities in order to assist all the key players in the container seaport system efficiently and effectively.
  
  PubDate: 2017-07-21T00:56:29Z
  DOI: 10.1016/j.enavi.2017.06.003
  Issue No: Vol. 7 (2017)
Design of Course-Keeping Controller for a Ship Based on Backstepping and
Neural Networks
- Authors: Qiang Zhang; Na Jiang; Yancai Hu; Dewei Pan
  Pages: 34 - 41
  Abstract: Publication date: June 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 7
  Author(s): Qiang Zhang, Na Jiang, Yancai Hu, Dewei Pan
  Due to the existence of uncertainties and the unknown time variant environmental disturbances for ship course nonlinear control system, the ship course adaptive neural network robust course-keeping controller is designed by combining the backstepping technique. The neural networks (NNs) are employed for the compensating of the nonlinear term of the nonlinear ship course-keeping control system. The designed adaptive laws are designed to estimate the weights of NNs and the bounds of unknown environmental disturbances. The first order commander are introduced to solve the problem of repeating differential operations in the traditional backstepping design method, which let the designed controller easier to implement in navigation practice and structure simplicity. Theoretically, it indicates that the proposed controller can track the setting course in arbitrary expected accuracy, while keeping all control signals in the ship course control closed-loop system are uniformly ultimately bounded. Finally, the training ship of Dalian Maritime University is taken for example; simulation results illustrated the effectiveness and the robustness of the proposed controller.
  
  PubDate: 2017-07-21T00:56:29Z
  DOI: 10.1016/j.enavi.2017.06.004
  Issue No: Vol. 7 (2017)
Resource Sharing in the Logistics of the Offshore Wind Farm Installation
Process based on a Simulation Study
- Authors: Thies Beinke; Abderrahim Ait Alla; Michael Freitag
  Pages: 42 - 54
  Abstract: Publication date: June 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 7
  Author(s): Thies Beinke, Abderrahim Ait Alla, Michael Freitag
  This present contribution examines by means of a discrete event and agent-based simulation the potential of a joint use of resources in the installation phase of offshore wind energy. To this end, wind farm projects to be installed simultaneously are being examined, the impact of weather restrictions on the processes of loading, transport and installation are also taken into consideration, and both the wind farm specific resource allocation and the approach of a resource pool or resource sharing, respectively, are being implemented. This study is motivated by the large number of wind farms that will be installed in the future and by the potential savings that might be realized through resource sharing. While, so far, the main driver of the resource sharing approach has been the end consumer market, it has been applied in more and more areas, even in relatively conservative industries such as logistics. After the presentation of the backgrounds and of the underlying methodology, and the description of the prior art in this context, the network of the offshore wind energy installation phase will be described. This is the basis for the subsequent determination of the savings potential of a shared resource utilization, which is determined by the performance indicators such as the total installation time and degree of utilization of the resources. The results of the simulation show that weather restrictions have a significant effect on the installation times and the usage times of the resources as well as on their degree of utilization. In addition, the resource sharing approach, has been identified to have significant savings potential for the offshore wind energy installation.
  
  PubDate: 2017-07-21T00:56:29Z
  DOI: 10.1016/j.enavi.2017.06.005
  Issue No: Vol. 7 (2017)
Azimuth method for ship position in celestial navigation
- Authors: Van-Suong Nguyen; Nam-Kyun Im; Quang-Dan Dao
  Pages: 55 - 62
  Abstract: Publication date: June 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 7
  Author(s): Van-Suong Nguyen, Nam-Kyun Im, Quang-Dan Dao
  The methods of celestial navigation to fix the ship position in line with the stars are only applied in the twilight time interval when both the celestial bodies and the horizon apppear simultaneously. This means that these methods cannot be used during the night even if the stars are visible. This paper proposes a novel approach which uses the azimuth of the celestial body in order to establish the great circle equation relating the observed body to the ship position when the celestial bodies appear. In addition, the proposed method does not demand the horizon and sextant equipment as with the previous methods. The key advantage which differentiates this method from previous ones is its ability to determine the ship position during the night when the horizon is invisible. Firstly, the vector calculus is applied to find the mathematical equation for the ship position through analyzing the relationship between the ship position and the great-circle azimuth of the observed body. Secondly, the equation system for the ship position is expanded into a standard system in which the input for the proposed mathematical system are the great-circle azimuth and the coordinates of the observed body. Finally, the numerical technique is also proposed to solve the nonlinear system for the ship position. To verify the validation of this proposed method, a numerical experiment is carried out and the results show that it can be applied well in practice.
  
  PubDate: 2017-07-21T00:56:29Z
  DOI: 10.1016/j.enavi.2017.06.006
  Issue No: Vol. 7 (2017)
Robust Adaptive Fuzzy Design for Ship Linear-tracking Control with Input
Saturation
- Authors: Yancai Hu; Gyei-Kark Park; Hengtao Wu; Qiang Zhang
  Pages: 9 - 16
  Abstract: Publication date: April 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 6
  Author(s): Yancai Hu, Gyei-Kark Park, Hengtao Wu, Qiang Zhang
  A robust adaptive control approach is proposed for underactuated surface ship linear path-tracking control system based on the backstepping control method and Lyapunov stability theory. By employing T-S fuzzy system to approximate nonlinear uncertainties of the control system, the proposed scheme is developed by combining “dynamic surface control” (DSC) and “minimal learning parameter” (MLP) techniques. The substantial problems of “explosion of complexity” and “dimension curse” existed in the traditional backstepping technique are circumvented, and it is convenient to implement in applications. In addition, an auxiliary system is developed to deal with the effect of input saturation constraints. The control algorithm avoids the singularity problem of controller and guarantees the stability of the closed-loop system. The tracking error converges to an arbitrarily small neighborhood. Finally, MATLAB simulation results are given from an application case of Dalian Maritime University training ship to demonstrate the effectiveness of the proposed scheme.
  
  PubDate: 2017-06-14T15:35:41Z
  DOI: 10.1016/j.enavi.2017.05.002
  Issue No: Vol. 6 (2017)
The Insurance Behavior Evaluation Process of Workers in the Container
Terminal Operation Context: An Example in the Port of Kaohsiung
- Authors: Chaur-Luh Tsai
  Pages: 17 - 28
  Abstract: Publication date: April 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 6
  Author(s): Chaur-Luh Tsai
  The aims This study aims to elucidate workers’ compensatory accident insurance purchasing behavior, as well as proposing a model to explain the behavioral intentions of front-line workers to purchase compensatory accident insurance. The scope The workers of the container terminal in the Kaohsiung port were used as the sample in this study. Methodology A questionnaire survey was administered to collect workers’ perceptions of accident insurance. The analysis methods of EFA, CFA and SEM were employed for further analysis. Conclusions According to a primary component factor analysis, three dimensions of insurance perception were found: perceived risk; perceived need for accident insurance; and perceived usefulness of accident insurance. The findings indicate that perceived risk, perceived need, and perceived usefulness of accident insurance positively affect the intention to purchase accident insurance. It is also found that perceived need constitutes the major factor affecting the intention of front-line workers to purchase accident insurance. However, perceived need is determined to play both a mediating and modulating role in the insurance behavior evaluation process model.
  
  PubDate: 2017-06-14T15:35:41Z
  DOI: 10.1016/j.enavi.2017.05.003
  Issue No: Vol. 6 (2017)
Proposed Minimum Luminous Range for Existing Lighthouses in This Age of
Global Navigation Satellite Systems by Using the Correlation between Light
Intensity and Luminous Range
- Authors: Ahmad Faizal Ahmad Fuad; Noor Apandi Osnin; Mohd Naim Fadzil; Mohd Zamani Ahmad
  Pages: 29 - 36
  Abstract: Publication date: April 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 6
  Author(s): Ahmad Faizal Ahmad Fuad, Noor Apandi Osnin, Mohd Naim Fadzil, Mohd Zamani Ahmad
  Long-range visual marine aids to navigation are not required for current marine navigational practices. Therefore, the objective of this study was to develop a minimum luminous range for major lighthouses that are still in existence to sustain the operation of the lighthouses in the future. Two steps were involved in the determination of the minimum luminous range, namely the modification of the existing geographical range formula, and the finding of a strong linear correlation between the light intensity and the luminous range with the lowest gradient possible in a graph. The application of the minimum luminous range would eliminate the loom of light beyond the geographical range of the lighthouse. This approach was applied to seven major lighthouses in Peninsular Malaysia, which resulted in a minimum luminous range of between 12nm to 14nm, which was a reduction from the existing range of 18nm to 25nm. The validation of the minimum luminous range was performed in two ways; using a Full Mission Ship Simulator (FMSS), and matching the proposed minimum luminous range with the lighting system available. The results of the validation by using the FMSS between the luminous range of 25nm and 14nm showed that the light could be sighted and identified at 58.7nm and 58.6nm, respectively, which was, therefore, not significant. The validation by matching with the lighting equipment available in the market showed that the eight-tier VLB-44, which has replaced the rotating lighting system in the US since 2008, was highly matched with the proposed minimum luminous range. This further validated the minimum luminous range. The minimum luminous range is sufficient for current navigational uses and may reduce the costs for procuring and maintaining lighting systems, and will be able to sustain the operations of lighthouses in this GNSS age.
  
  PubDate: 2017-06-14T15:35:41Z
  DOI: 10.1016/j.enavi.2017.05.004
  Issue No: Vol. 6 (2017)
Ocean Economy and Fault Diagnosis of Electric Submersible Pump applied in
Floating platform
- Authors: Panlong Zhang; Tingkai Chen; Guochao Wang; Changzheng Peng
  Pages: 37 - 43
  Abstract: Publication date: April 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 6
  Author(s): Panlong Zhang, Tingkai Chen, Guochao Wang, Changzheng Peng
  Ocean economy plays a crucial role in the strengthening maritime safety industry and in the welfare of human beings. Electric Submersible Pumps (ESP) have been widely used in floating platforms on the sea to provide oil for machines. However, the ESP fault may lead to ocean environment pollution, on the other hand, a timely fault diagnosis of ESP can improve the ocean economy. In order to meet the strict regulations of the ocean economy and environmental protection, the fault diagnosis of ESP system has become more and more popular in many countries. The vibration mechanical models of typical faults have been able to successfully diagnose the faults of ESP. And different types of sensors are used to monitor the vibration signal for the signal analysis and fault diagnosis in the ESP system. Meanwhile, physical sensors would increase the fault diagnosis challenge. Nowadays, the method of neural network for the fault diagnosis of ESP has been applied widely, which can diagnose the fault of an electric pump accurately based on the large database. To reduce the number of sensors and to avoid the large database, in this paper, algorithms are designed based on feature extraction to diagnose the fault of the ESP system. Simulation results show that the algorithms can achieve the prospective objectives superbly.
  
  PubDate: 2017-06-14T15:35:41Z
  DOI: 10.1016/j.enavi.2017.05.005
  Issue No: Vol. 6 (2017)
Text-Mining and Gamification for the Qualification of Service Technicians
in the Maintenance Industry of Offshore Wind Energy
- Authors: Thies Beinke; Annabell Schamann; Michael Freitag; Klaas Feldmann; Matthias Brandt
  Pages: 44 - 52
  Abstract: Publication date: April 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 6
  Author(s): Thies Beinke, Annabell Schamann, Michael Freitag, Klaas Feldmann, Matthias Brandt
  The competition of maintenance services in the offshore wind industry is continually increasing. The quality of the services acts as the distinguishing feature in the industry. Furthermore, there are public standards, which lead to the permanent necessity to offer further education and training programs for employees. To meet the requirements for further training in the specific field of application within the offshore wind industry, a gamified e-learning application has been developed and is introduced in this paper. It consists of a complete solution, which contains the automated analysis of service protocols to identify qualification needs, the involvement of service technicians in the generation of learning materials, the preparation, transmission as well as the further development of those materials in accordance with the principles of e-learning. Finally, the solution contains a gamified mobile application for qualification, which is designed to meet the individual learning needs of the service technicians. This concept paper follows a problem-centred approach. Based on the current state of technology and research, the problem and motivation are identified and the urgency is verified. Furthermore, a detailed specification of the solution and a first implementation approach is presented.
  
  PubDate: 2017-06-14T15:35:41Z
  DOI: 10.1016/j.enavi.2017.05.006
  Issue No: Vol. 6 (2017)
A Novel Image Encryption Scheme Based on Clifford Attractor and Noisy
Logistic Map for Secure Transferring Images in Navy
- Authors: Mohadeseh Kanafchian; Behrouz Fathi-Vajargah
  Pages: 53 - 63
  Abstract: Publication date: April 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 6
  Author(s): Mohadeseh Kanafchian, Behrouz Fathi-Vajargah
  Cryptography is a science to maintain the security of the message by changing data or information into a different form, so the message cannot be recognized. Today, many algorithms have been proposed for image encryption, but the chaotic encryption methods have a good combination of speed and high security. In recent years, the chaos based cryptographic algorithms have suggested some new and efficient ways to develop secure image encryption techniques. The chaos-based encryption schemes are composed of two steps: chaotic confusion and pixel diffusion. In the chaotic confusion stage, a combination of the chaotic maps is used to realize the confusion of all pixels. In this paper, we first give a brief introduction into chaotic image encryption and then we investigate some important properties and behaviour of the logistic map. The logistic map, aperiodic trajectory, or random-like fluctuation, could not be obtained with some choice of initial condition. Therefore, a noisy logistic map with an additive system noise is introduced. The proposed scheme is based on the extended map of the Clifford strange attractor, where each dimension has a specific role in the encryption process. Two dimensions are used for pixel permutation and the third dimension is used for pixel diffusion. In order to optimize the Clifford encryption system we increase the space key by using the noisy logistic map and a novel encryption scheme based on the Clifford attractor and the noisy logistic map for secure transfer images is proposed. This algorithm consists of two parts: the noisy logistic map shuffle of the pixel position and the pixel value. We use times for shuffling the pixel position and value then we generate the new pixel position and value by the Clifford system. To illustrate the efficiency of the proposed scheme, various types of security analysis are tested. It can be concluded that the proposed image encryption system is a suitable choice for practical applications.
  
  PubDate: 2017-06-14T15:35:41Z
  DOI: 10.1016/j.enavi.2017.05.007
  Issue No: Vol. 6 (2017)
Edboard page
- Abstract: Publication date: June 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 7
  
  PubDate: 2017-07-21T00:56:29Z
Edboard page
- Abstract: Publication date: April 2017
  Source:International Journal of e-Navigation and Maritime Economy, Volume 6
  
  PubDate: 2017-06-14T15:35:41Z