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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Navigation and Port Research
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Journal DOI :
Korean Institute of Navigation and Port Research
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Volume & Issues
Volume 37, Issue 6 - Dec 2013
Volume 37, Issue 5 - Oct 2013
Volume 37, Issue 4 - Aug 2013
Volume 37, Issue 3 - Jun 2013
Volume 37, Issue 2 - Apr 2013
Volume 37, Issue 1 - Feb 2013
Selecting the target year
Systematic Error Correction of Sea Surveillance Radar using AtoN Information
Kim, Byung-Doo ; Kim, Do-Hyeung ; Lee, Byung-Gil ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 447~452
DOI : 10.5394/KINPR.2013.37.5.447
Vessel traffic system uses multiple sea surveillance radars as a primary sensor to obtain maritime traffic information like as ship's position, speed, course. The systematic errors such as the range bias and the azimuth bias of the two-dimensional radar system can significantly degrade the accuracy of the radar image and target tracking information. Therefore, the systematic errors of the radar system should be corrected precisely in order to provide the accurate target information in the vessel traffic system. In this paper, it is proposed that the method compensates the range bias and the azimuth bias using AtoN information installed at VTS coverage. The radar measurement residual error model is derived from the standard error model of two-dimensional radar measurements and the position information of AtoN, and then the linear Kalman filter is designed for estimation of the systematic errors of the radar system. The proposed method is validated via Monte-Carlo runs. Also, the convergence characteristics of the designed filter and the accuracy of the systematic error estimates according to the number of AtoN information are analyzed.
Estimating Cumulative Distribution Functions with Maximum Likelihood to Sample Data Sets of a Sea Floater Model
Yim, Jeong-Bin ; Yang, Won-Jae ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 453~461
DOI : 10.5394/KINPR.2013.37.5.453
This paper describes evaluation procedures and experimental results for the estimation of Cumulative Distribution Functions (CDF) giving best-fit to the sample data in the Probability based risk Evaluation Techniques (PET) which is to assess the risks of a small-sized sea floater. The CDF in the PET is to provide the reference values of risk acceptance criteria which are to evaluate the risk level of the floater and, it can be estimated from sample data sets of motion response functions such as Roll, Pitch and Heave in the floater model. Using Maximum Likelihood Estimates and with the eight kinds of regulated distribution functions, the evaluation tests for the CDF having maximum likelihood to the sample data are carried out in this work. Throughout goodness-of-fit tests to the distribution functions, it is shown that the Beta distribution is best-fit to the Roll and Pitch sample data with smallest averaged probability errors
of 0.024 and 0.022, respectively and, Gamma distribution is best-fit to the Heave sample data with smallest
of 0.027. The proposed method in this paper can be expected to adopt in various application areas estimating best-fit distributions to the sample data.
An Analysis of GPS Station Positioning Accuracy Variations According to Locations of Obstacles
Sohn, Dong-Hyo ; Park, Kwan-Dong ; Jung, Wan-Suk ; Kee, Changdon ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 463~469
DOI : 10.5394/KINPR.2013.37.5.463
This paper focuses on GPS positioning accuracy variations according to locations of obstacles which surround GPS station. We derived precise coordinates of a GPS station which has a good visibility. Its observation data was rewritten by assuming signal blocking due to obstacle in the elevation angle of
. We processed daily and hourly data for 10 days. In the results using daily data, RMSE was at 10mm level. And RMSE increased to 100mm levels in case of hourly data. As the elevation angle of obstacle increased, the horizontal and vertical RMSE increased, while the height estimates decreased. These results showed the higher the elevation angle of the obstacle increased the loss of large amounts of data by blocking satellite signals direction. In terms of the direction, when the blocking thing was located in the east or west, the coordinate has larger error in the east-west direction. And if signal was blocked at the south direction, the difference between the east-west error and the south-north position error was reduced.
Theoretical Examination of the Pay-for-Performance Practice: Case of a Shipbuilding Company
Jun, Gyung-Ju ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 471~480
DOI : 10.5394/KINPR.2013.37.5.471
Pay-for-performance plans are some of widely used human resource practices in many firms, including shipbuilding, for productivity and motivational improvement purposes. Such plans play an important role in industries that are highly labor-intensive, and where effective management of human resources is critical to business operations, such as the shipbuilding industry. Those practices can have large impact on employee performance and ultimately company competitiveness. Research studies that show how such incentive plans improve productivity and reported pattern of adoption by firms have spurred the use and adoption in many firms. However, there are also researchers who point out that there are negative consequences to using incentive plans. Therefore it is important for companies to carefully consider the practices they use. In this paper, I discuss research findings that support the practices and critical viewpoints related to pay-for-performance plans. Research findings from Korean literature are, then, discussed. The shipbuilding industry is chosen because proper human resource management is critical in reducing turnover and increasing employee satisfaction. Through a shipbuilding company case, problems related to using pay-for-performance incentive plans and how they affect work-related issues of employee morale, cooperation, and teamwork will be discussed. While positive aspects have been emphasized to drive greater adoption among firms, the resulting consequences of the pay plans need to be seriously considered and improvements upon the plans made by firms. Improvement suggestions are discussed in the conclusions and implications.
Analysis on the Pitch Response Spectra of a Catamaran with Bulb
Seo, Kwang-Cheol ; Lee, Chang-Woo ; Atlar, Mehmt ; Lee, Gyoung-Woo ; Gim, Ok-Sok ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 481~486
DOI : 10.5394/KINPR.2013.37.5.481
In this study, a commercial seakeeping program Seakeeper, integrated into Maxsurf, which is based on the linear strip theory was employed to compare the effect of bulbous bow (with/without) on motion response characteristics in a 18-meter catamaran. The seakeeping analyses were conducted at several Beaufort wind conditions such as scale No. 3 (
=0.6m), No. 4 (
=1m) and No. 5 (
=2m) based on ITTC wave spectrum. Pitch motion response spectrum was calculated at Head sea, Head & bow sea and Beam sea as encounter angles. Hull form of a catamaran with bulb showed the maximum 20% decrease of pitch motion response as compared to that of hull form without bulb.
Analysis of Optimum Iterative Codes for Underwater Acoustic Communication based on Turbo Equalizer
Park, Tae-Doo ; Jung, Ji-Won ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 487~492
DOI : 10.5394/KINPR.2013.37.5.487
Underwater acoustic communication has multipath error because of reflection by sea-level and sea-bottom. The multipath of underwater channel causes signal distortion and error floor. In order to improve the performance, it is necessary to employ an iterative coding scheme. Among the iterative coding scheme, turbo codes, LDPC codes and convolutional code based on BCJR algorithm are dominant channel coding schemes in recent. Therefore this paper analyzed the performance of iterative codes based on turbo equalizer with the same coding rate and similar codeword length. The performances of three kinds of iterative codes were evaluated in the environment of underwater acoustic communication channel that are real data collected in Korean east sea. The distance of transmitter and receiver was 5Km and data rate was 1Kbps. As a result, convolutional code based on BCJR algorithm has better performance in underwater channel than turbo codes and LDPC codes.
Priority Evaluation of Preliminary Cases for IMO Information Management System using Fuzzy TOPSIS and AHP
Jang, Woon-Jae ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 493~498
DOI : 10.5394/KINPR.2013.37.5.493
This paper is aimed to priority evaluation of preliminary cases for IMO -IMS(International Maritime Organization- Information Management System) using fuzzy TOPSIS(Technique for Order Performance by Similarity to Ideal Solution) and AHP(Analytic Hierarchy Process). To this solve, therefore, this paper extract 24 preliminary cases and select 4 major preliminary alternative cases after analysing the structure of its alternative cases using FSM(Fuzzy Structure Modeling). Also, the weights of evaluation factors determine using AHP which able to keep the consistency when decision-makers assess. In AHP method, but, the numbers of paired comparison incerase as much as the numbers of the comparison items increase and because this evaluation have the many of vagueness, the decision of final ranking is used to fuzzy TOPSIS method which is included TOPSIS and Fuzzy Set Theory. The result are developed as order as Management of IMO Convention Information, Delivery of IMO Convention Information, Total IMO Database, Knowledge Hub of IMO Convention Information in IMO-IMS.
Strategic Identification of Unsafe Actions That Characterize Accidents on Ships
Rivai, Haryanti ; Furusho, Masao ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 499~509
DOI : 10.5394/KINPR.2013.37.5.499
Seafarers are one of the main engines driving economic growth in the maritime sector. The International Maritime (IMO) Organization estimated that there were approximately 1.5 million seafarers around the world engaged in international trade in 2012. Data have shown that human casualties in maritime accidents around Japan have shown an increasing trend over the last ten years. One cause is human error, which is inseparable from the human element that influences mariner's decisions and actions. The Personal Identification (PIN) Safe method is one way to systematically identify substandard and unsafe actions by considering the error taxonomies associated with various scenarios for a maritime system. The results are based on analysis of the role of the human element in commonly reported unsafe actions when interacting with equipment and other systems. Furthermore, patterns of influencing shaping factors were observed on the basis of data processing; the aim of this study was to promote safety culture and provide an opportunity to improve safety at sea.
The Study on ensuring Effectiveness of IMO Instrument regarding GHG emission from Ships - focusing on MARPOL73/78 Annex VI
Doo, Hyun-Wook ; Lee, Yun-Cheol ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 511~517
DOI : 10.5394/KINPR.2013.37.5.511
UNFCCC was adopted in 1992 in order to prevent global warming. However, as a lack of concrete reduction goal and implementation plan, UNFCCC could not have effectiveness. In 1997, Kyoto Protocol to UNFCCC was adopted and UNFCCC regime started practically binding on the parties. Global warming takes the leading role in changing marine environment such as the rising of water level and sea water temperature. Also, Ocean plays the vital role in storing carbon to prevent global warming. Meanwhile ships which get the propulsion generated by consuming the fossil fuel are identified as GHG source and the discussions regarding the control of GHG emitted from ships are still in progress in IMO. IMO instrument has some legal conflicts with UNFCCC in principle. Therefore, this paper reviews the present UNFCCC regime and UNCLOS. Also, it surveys activities of IMO and analyze the Amendment to MARPOL73/78 Annex VI which entered into force on January 1, 2013. Finally, conclusions suggest the improvements in order to ensure effectiveness the new Amendment to MARPOL73/78 practically.
A Study on the Qualifications of Designated Person on the Maritime Safety Act
Jin, Ho-Hyun ; Kim, Jin-Kwon ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 519~526
DOI : 10.5394/KINPR.2013.37.5.519
In managing shipping business, the concept of seaworthiness of the vessel has developed in accordance with the development of the shipping industry. However, despite of the development of the vessel's seaworthiness, marine accident has continuously occurred at sea. International Maritime Organization(IMO) has paid attention to the research and investigation of Human Error in shipping operations in addition to physical seaworthiness of the vessel. In 1994, IMO adopted the "International Management Code for the Safe Operation of Ships and for Pollution Prevention(ISM code)" of "SOLAS 1974" Annex, to take countermeasure against this human error. In 1999, Korea adopted the 'ISM Code' and then enacted the Maritime Safety Act (previously Maritime Traffic Safety Act). The Maritime Safety Act regulates necessary qualifications of the Human Resources of shipping companies for establishment and implementation of the safety management system. However, there has been a discrepancy between shipowners and ship management companies in interpreting the legislative texts, finally causing confusion. In this paper, I would like to examine the deficiencies in the regulation on the standard of qualifications of the Designated Person under the Maritime Safety Act and thereby suggest any possible improvements in it.
Integrity Estimation for Concrete Pontoon of Floating Structure
Park, Soo-Yong ; Kim, Min-Jin ; Seo, Young-Kyo ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 527~533
DOI : 10.5394/KINPR.2013.37.5.527
This paper presents damage detection and estimation of stiffness parameter on a concrete scale model and a real structure of concrete pontoon using dynamic properties such as mode shapes and natural frequencies. In case of damage detection, dynamic impact test on a concrete scale model is accomplished to extract mode shapes and the practicality is verified by utilizing a damage detection technique. And the stiffness parameter of a real structure of concrete pontoon was estimated via system identification technique using the natural frequencies of the structure. The results indicate that the damaged elements of the scale model are found exactly using damage detection technique and the effective stiffness property of the real structure of concrete pontoon can be estimated by system identification technique.
Correlation Analysis Between Lane Occupancy and Density in Expressways Connected with the Busan Port
Kim, Tae-Gon ; Heo, In-Seok ; Park, Bae-Seong ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 535~541
DOI : 10.5394/KINPR.2013.37.5.535
Expressways are built to provide for high levels of safety and efficiency in the movement of large traffic volumes at high speeds. However, Gyeongbu and Namhae expressways in the country which are often suffering from the transportation problems with increased import and exoprt cargo trucks including the container vehicles are the major expressways having the Busan Port as the origin and destination regions, and are required to study the expressway traffic characteristics for reducing the transportation problems. We therefore attempted to suggest the expressway density predictive model through the correlation analysis between lane occupancy and mean density at the 8-lane basic segments of the above major expressways in the country.
A Study on the Users' Awareness of Waterfront in Busan Area - Focusing on Haeundae & Jagalchi
Yang, Dong-Cheon ; Kon, Masayuki ; Lee, Myung-Kwon ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 543~549
DOI : 10.5394/KINPR.2013.37.5.543
In this study, as waterfront space to represent the Busan, to elect (Haeundae, Minrak park, Gwangalli, APEC Naru Park, Dadaepo, Jagalchi, Taejongdae) the seven high degree of recognition, we conducted a pre-sample survey. We investigated the awareness of waterfront space to re-conducted a questionnaire survey (Haeundae, Jagalchi) the two places the property was most apparent on the basis of the result, visitors feel about waterside space. As a result, the Haeundae, has been answered ". Feels the breeze of the sea" (163 people) 81.5% of users, Jagalchi is the fruits of the sea "(111 people) 55.8% it is answered. "that can be eaten. In addition, the center of consciousness of waterfront space, we conducted an analysis of the overall satisfaction of waterfront space age group of each, depending on the desired behavior.
Manufacture of Portable Inflatable Kayak Using Ultra High Pressure Drop Stitch
Park, Chan-Hong ; Park, Byeong-Ho ; Park, Jong-Dae ; Seong, Hyeon-Kyeong ; Lim, Lee-Young ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 551~557
DOI : 10.5394/KINPR.2013.37.5.551
In this paper, we manufactured portable inflatable kayak using ultra high pressure drop stitch. by improving inflatable kayaks' performance with a design using the extra-high-voltage special space paper, they were manufactured to go near to performance of hard shell kayaks. The kayaks were manufactured having all merits of the performance of hard shell kayaks and functionality and portability of the inflatable kayaks, and through performance evaluation of test products, the performance was compared with previous hard shell kayaks. About 6 knot of target speed in the verification result of resistance performance, the developed kayak was more excellent than the HOBIE-KONA kayak by 12.33%. In case of same displacement in a result of inclination test, the centroid of the developed kayak was less distributed by 22.7% than the HOBIE-KONA kayak, based on the bottoms of the ships. This makes the difference for righting arm (GZ) lessened to some degree because the developed kayak is lower than the HOBIE-KONA kayak in the centroid. In the dynamic stability of ship bodies, the HOBIE-KONA kayak showed a little excellent performance. However, in rudder force and resistance factor, the developed kayak was more outstanding than the HOBIE-KONA kayak.
A Study on the Evaluation of Improvement Factors of Tug Services in Korea
Yeou, Young-Hun ; Ryoo, Dong-Keun ;
Journal of Navigation and Port Research, volume 37, issue 5, 2013, Pages 559~565
DOI : 10.5394/KINPR.2013.37.5.559
The purpose of this study is to prioritize improvement factors of the tug services in terms of the structural problem, operating system and the present condition of the tug at each port in Korea. It was identified that the tug operating system needs to be mostly improved among the improvement factors of the tug services in Korea. In addition, free contract and rotating system were found to be important factors which need to be improved comparing to other factors such as service quality, tug rules, operating practices of council for tug operation and customer factor. The service attitude of the tug companies was regarded as an important element. And the tug entry system appeared to be an important item. Finally, laws relating to tug business needs to be revised which allow new tug companies enter into the market. As the result of AHP analysis for tug systems and service improvement factors, some fundamental changes of tug operation systems are urgently needed.