فهرست مطالب عامر کعبی

With growth of Technology, With growth of technology, the needs for data and information security over communication channels are necessary. Providing information security in marine environment includes communication between ships and also ships with ground station are one of the most important issues in information security. In order to provide Confidentiality, symmetric key cryptography algorithms such DES, 3DES, IDEA, RC6, Serpent and AES are presented by researchers. Different reports in literature are presented by researchers in order to compare the performance of these algorithms. Despite various considerations, the needs for deep comparison of these algorithms are needed. Therefore in this paper, deep consideration and comparison in the points of architecture, flexibility, security and speed of these algorithms are done. Based on the achieved results, the appropriate algorithm can be employed based on required flexibility, speed or desired levels of security. The result of implementation and comparison shows the advantages of AES algorithm in provided security and RC6 in speed of execution.

The aim of this study was to evaluate the relative efficiency of major cargo ports in Middle East over the three-year period of 2011-2013. The research data were collected from scientific resources and input and output data from statistical yearbook of the Iranian ports, maritime organization and formal website of each foreignport. Initially, the relative efficiency of ports was evaluated via two basic model of DEA-technique namely CCR-O and BCC-O and the ports were ranked accordingly using the 100% efficiency Anderson-peterson method. Based on the results of output- oriented CCR modelthatrepresents overall technical efficiency, Khorfakkan Port showed the highest and Bandar ImamKhomeini the lowest coefficient of efficiency during the given period. Based on the results of output- oriented BCC modelthatrepresents pure technical efficiency, Bushehr, Jebel Ali, KhorfakkanandAlexandria were found to have the highestandBandar ImamKhomeini the lowest coefficient of efficiency. Apart from Khorfakkan and Alexandriathat were underconstantreturns to scale, other ports were under variablereturns to scale. The scrutinized ports revealed an average of 54.3%, in technical efficiency and an average of 73% in pure technical efficiency during 2011-2013.

This study aims to benchmark the efficiency of major Container seaports in Middle East and investigate the changes in the pure technical efficiency, and nature of returns to scale using the Data Envelopment Analysis (DEA) method over the period 2011 to 2013. Firstly the Relative Efficiency of Ports are evaluated via one basic model of DEA namely BCC-O. Then ports are ranked based on the achieved results. To ranking ports which had 1 score efficiency, Anderson-peterson method is used. According to the results of this study, port of Imam Khomeini show relatively low operational efficiency and ports of Bushehr, Jebel Ali, Khorfakkan and Alexandria have the highest score of efficiency. In the final section, suggestions are proposed for the existing problems in port efficiency.

The aim of this study, is evaluating of relative efficiency of major container port in Middle East for the period of 2011-2013. Required information was collected from scientific resources and inputs and outputs data were collected from statistical yearbook of the Iran’s ports and maritime organization and formal website of each foreign port. Firstly in this study Relative Efficiency of Ports were evaluated via one basic model of DEA-technique namely BCC-O. Then ports were ranked based on the achieved results. To rank ports with the 100% efficiency Anderson-peterson method was used. Based on the results of output- oriented CCR model that represents overall technical efficiency, port of Khorafkan, has the highest coefficient of efficiency and Bandar Imam Khomeini has been the weakest port in three years in this respect. The average efficiency of studied ports is 54.3% in the period of 2011-2013. Finally, virtual ports were proposed as template for inefficient ports to improve efficiency.

Studying the marine accidents of Arvand channel and estuary during last five years¡ this research aims to locate the geographic place of risky points. Then through an annual and monthly chronological analysis and by application of time and place management¡ it tries to identify the eventful months in order to maximize the success of marine search and rescue measures. On the other hand¡ the chronological study of the mentioned accidents indicates that to what extent the accomplished attempts could have reduced or limited marine losses. As well¡ this study indicates that how marine rescue stations and the place of strategic search and rescue equipment suit the geographic place of eventful places. All accidents have been summarized into vessels'' marine accidents¡ borderline aggressions and crews'' illness and injuries. Then the factors of fatal and financial losses and damages have been identified based on which weighting is done. The weights of all accidents have been determined prior to chronological and spatial analysis. ARC VIEW GIS program has been applied for spatial analysis. The accidents position and their relevant intensity as the relevant specification have been entered into the program. The spatial analysis in this program has been done via Inverse Distance Weighting (IDW) method. The focus map of various accidents has been extracted. Place analyses in this research led to identification of 6 dangerous areas in view point of vessels accidents¡ 4 hazardous areas for human accidents and one highly risky area in view point of aggression to vessels. The annual time analysis show that during last 5 years¡ only the number of border aggressions has decreased while there is no obvious decreasing trend in vessels and human accidents. As well¡ the monthly time analysis shows 3 hazardous time sections in vessels accidents. The occurrence of accidents relevant to border aggressions is focused in the first quarter of each year. Management of rescue equipments - in two aspects of place and time - in hazardous areas as well as suggestion of having marine equipment in hazardous places is of the obtained results of place and time analyses in this research.

This applied research has been conducted to evaluate the competitiveness of port services using exploratory factor analysis and importance- performance analysis methods. First, by literature review, 53 indicators of competitiveness of port services has been identified, then exploratory factor analysis was used to ensure the effectiveness of the identified indicators. Based on the obtained results from 53 identified indicators, in the factor analysis, only 27 of indicator have loadings on the eight factors of Logistics Cost, Connectivity, Port facility, Port Service and Availability, Safety and security, Efficiency and Productivity, Reliability, Hinterland condition. The results of the importance and performance analysis showed that among of eight factors, respectively efficiency and productivity factor has the highest and Hinterland condition has the lowest the difference between the performance average from importance average. And also the Position of each factor in the quarters of the importance and performance matrix indicates that other than the second factor (Connectivity) and fifth factor (Safety and Security) all other factors located in a quarter one.

This study aims to extract the functions of demand and estimating cargo traffic of each transportation modes (road & railroad) connected to the Iran's hinterland transportation network within a range of 20 years (case study of Imam Khomeini Port). For this purpose, first effective explanatory variables were identified then traffic load of the modes were estimated using two stage simultaneous equation model of time series analysis by Eviews software. The results indicate that in case of no change in current policies, share of railway in cargo transportation to/from this port will be reduced significantly and at the most will reach 5%. That is in contrast with the objectives of the 20 year national transportation master plan calling railway for 30% of national cargo transportation.

The aim of this paper is to determine the optimum number of truck processing booths in the BIK dry-bulk terminal entrance gate, to reduce the associated truck congestions. The queuing theory has been used to gain this purpose. The necessary data to analyze system performance analysis factors and to determine the pattern of inter arrival and service times are collected by several field studies. Then, the M/M/s queuing model has been developed for this port. Further, the K-S and χ2 goodness of fit tests has also demonstrated the suitability of model development. Then, the related system performance measurements have been determined. The performance measurements analysis showed a very high sensitiveness for this system and every change in the number of servers caused great impact on the system utilization and performance.. ..

Wave spectrum provides a frequency domain description of the sea surface elevation and the stochastic process. Depending on the nature of the sea state they will be described by different shapes of spectra. Information about the spectral characteristics of waves such as significant wave height, peak wave period and wave spectral energy density are the basic needs of many scientific and engineering activities. In this study the raw wave's data measured by the ADCP in the Asalouye from April 2006 to April 2007 are analyzed. Due to the need to convert the analyzed data into the frequency spectrum through the Fast Fourier Transform, certain considerations are made in analyses. Time series data obtained are classified, and after quality control, these data are used to obtain spectral energy density. The smoothed measured spectrum is compared with some various wave spectra estimated based on theoretical formulations such as Jonswap-Bretschneider-Ochi-Wallop spectra. Results of this study shows that the JONSWAP spectrum is in a good agreement with the measured spectrum. Root mean square values between maximum spectral energy obtained from measured and estimated by JONSWAP is less than other spectral models. It is also found that the spectrum of the region of study is predominant single peak. Furthermore directional wave spectrum is determined by using frequency spectrum based on Longuet – Higgins theory.