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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Engineering
Journal Basic Information
Journal DOI :
Korean Society of Marine Engineers
Editor in Chief :
Volume & Issues
Volume 40, Issue 6 - Jul 2016
Volume 40, Issue 5 - Jun 2016
Volume 40, Issue 4 - May 2016
Volume 40, Issue 3 - Mar 2016
Volume 40, Issue 2 - Feb 2016
Volume 40, Issue 1 - Jan 2016
Selecting the target year
Low temperature vacuum drying heat transfer characteristics of Korean raw oysters
Kim, Kyung-gun ; Song, Chi-sung ; Choi, Se-hyun ; Lee, Seo-Yeon ; Mun, Soo-Beom ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 1~9
DOI : 10.5916/jkosme.2016.40.1.1
Oysters are rich in nutrients with good flavor, and disease prevention is required in both the East and the West for high-quality seafood. The best way to store and transport mass-produced oysters is using dry techniques. Using both hot and frozen drying technologies to obtain a perfectly dried oyster often destroys much of the flavor and nutrients found with the oyster meat. This study uses a low temperature vacuum drying technology to investigate the final weight ratio of wild and farmed dried oysters. Additionally, the heat transfer characteristics of steamed oysters are discussed in this paper.
Life extension of moss LNG carriers using full spectral fatigue analysis
Park, Jun-Bum ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 10~16
DOI : 10.5916/jkosme.2016.40.1.10
Fatigue analysis for life extension of a ship is different from that of a newly constructed ship since the current corrosion margin and voyage routes of the past and future must be considered, thereby complicating the life extension procedure. This research introduces the fatigue analysis case for the life extension project of a moss LNG carrier using full spectral fatigue analysis, which has been previously used for newly constructed ships. It is expected that the fatigue analysis methodologies and full spectral fatigue analysis program used in this study will be applicable to other life extension projects.
Latest welding technology for storage and transportation facilities of liquified natural gas
Kim, Young-Sik ; Kil, Sang-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 17~27
DOI : 10.5916/jkosme.2016.40.1.17
The need for storage and transportation facilities of liquefied natural gas have increased significantly because of global environmental regulations and recent shale gas innovation in North America. There is severe competition between Korea, Japan, and China for receiving manufacturing orders of LNG carriers or LNG storage tanks. Rationalization of the welding process used in the manufacturing of LNG facilities plays an important role in the above competition. This review paper presents the current global status and tendency for the development of latest welding technologies for LNG storage and transportation facilities. This article intends to present materials for raising the domestic competitive power for receiving manufacturing orders of LNG facilities.
Low price type inspection and monitoring system of lithium ion batteries for hybrid vessels
Kwon, Hyuk-joo ; Kim, Min-kwon ; Lee, Sung-geun ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 28~33
DOI : 10.5916/jkosme.2016.40.1.28
Batteries are used for main power engine in the fields such as mobiles, electric vehicles and unmanned submarines, for starter and lamp driver in general automotive, for emergency electric source in ship. These days, lead-acid and the lithium ion batteries are increasingly used in the fields of the secondary battery, and the lead-acid battery has a low price and safety comparatively, The lithium ion battery has a high energy density, excellent output characteristics and long life, whereas it has the risk of explosion by reacting with moisture in the air. But Recently, due to the development of waterproof, fireproof, dustproof technology, lithium batteries are widely used, particularly, because their usages are getting wider enough to be used as a power source for hybrid ship and electric propulsion ship, it is necessary to manage more strictly. Hybrid ship has power supply units connected to the packets to produce more than 500kWh large power source, and therefore, A number of the communication modules and wires need to implement the wire inspection and monitor system(WIIMS) that allows monitoring server to transmit detecting voltage, current and temperature data, which is required for the management of the batteries. This paper implements a low price type wireless inspection and monitoring system(WILIMS) of the lithium ion battery for hybrid vessels using BLE wireless communication modules and power line modem( PLM), which have the advantages of low price, no electric lines compared to serial communication inspection systems(SCIS). There are state of charge(SOC), state of health(SOH) in inspection parts of batteries, and proposed system will be able to prevent safety accidents because it allows us to predict life time and make a preventive maintenance by checking them at regular intervals.
Transient analysis of marine propulsion motor and shaft under abnormal conditions
Oh, Sae-Gin ; Kim, Jong-Su ; Kim, Seung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 34~38
DOI : 10.5916/jkosme.2016.40.1.34
Recently, electric propulsion systems are been increasingly used in large cruise ships and merchant vessels. When abnormal electrical conditions occur in the motor of an electric propulsion ship, they can cause serious damage to the motor and propeller shaft. Research on abnormal conditions of propulsion motors used in electric propulsion vessels and electric ships difficult to find. In this study, a mathematical model of the electric propulsion system is proposed to analyze transient phenomena that occur in the case of electric propulsion motor or propeller shaft malfunction. A synchronous motor was used in the MATLAB computer simulation of this study. In the event of electrical malfunction of the electric propulsion motor at rated operation, over current occurs in the condition of 1 phase ground, over torque occurs at 3 and 2 phases ground and over current and torque occur when exciting power fails at rated operation.
A study on the development of digital AVR for ship and offshore
Lee, Jun-Soo ; Yun, Kyung-Guk ; Kim, Jong-Su ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 39~44
DOI : 10.5916/jkosme.2016.40.1.39
Automated voltage regulators (AVRs) are used on ships and offshore to automatically adjust the voltage based on real-time output voltage readings of the generator engine. Analog-type AVR was previously more commonly used, but is slowly being replaced with digital-type AVR because of increased demands of response time. This study presents a new digital AVR system that contains appropriate features of the AVR with respect to offshore unstable load conditions and poor operating conditions. Furthermore, experiments of load and voltage change prove the excellence of stability and response of the proposed system compared to previous AVR systems. Additionally, an integrated control system for a monitoring the output voltage and field current was developed to easily set the gain value.
Performance analysis of turbo codes based on underwater experimental data
Sung, Ha-Hyun ; Jung, Ji-Won ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 45~49
DOI : 10.5916/jkosme.2016.40.1.45
The performance of underwater acoustic communication systems is sensitive to inter-symbol interference caused by delay spread developed from multipath signal propagation. The multipath nature of underwater channels causes signal distortion and error floor. In order to improve the performance, it is necessary to employ an iterative coding scheme. Of the various iterative coding schemes, turbo code and convolutional code based on the BCJR algorithm have recently dominated this application. In this study, the performance of iterative codes based on turbo equalizers with equivalent coding rates and similar code word lengths were analyzed. Underwater acoustic communication system experiments using these two coding techniques were conducted on Kyeong-chun Lake in Munkyeong City. The distance between the transmitter and receiver was 400 m, and the data transfer rate was 1 Kbps. The experimental results revealed that the performance of turbo codes is better for channeling than that of convolutional codes that use a BCJR decoding algorithm.
Wireless sensor network analysis of suitable types for fixed facility surveillance
Lee, Hoo-Rock ; Rhyu, Keel-Soo ; Chung, Kyung-Yul ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 50~54
DOI : 10.5916/jkosme.2016.40.1.50
A Wireless Sensor Network (WSN) is better than a conventional network for use in construction and Operations and Maintenance (O&M) because of its lower surveillance system cost. However, effective operation of a WSN is often difficult to obtain because the surveillance targets are usually fixed inside the building or underground. Therefore, this environmental constraint should be considered in the design of the WSN plant equipment surveillance system prior to installation. This study employs simulations of WSN-based fixed facility surveillance using the TinyOS TOSSIM simulator to investigate ideal types and setups of the WSN. Simulation target protocols included LEACH and flooding and gossiping protocols. The results show that the hierarchically-structured LEACH protocol demonstrated better load-balancing and efficiency than the flatly-structured flooding and gossiping protocol.
A design of embedded PC-Fi system with interactive remote control
Bae, Min-Eui ; Shin, Ok-Keun ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 55~61
DOI : 10.5916/jkosme.2016.40.1.55
As the price-performance ratio of embedded PCs improves, the benefits of the PC-Fi can be maximized by designing an embedded PC-Fi system. In this paper presents the design of an embedded PC-Fi that can be manipulated by a remote controller based on mobile devices such as smart phones or tablets. Additionally, an interactive control system and its GUI, through which the user can select and play music as they like at ease, are presented. The case that a large amount of music is stored in the PC-Fi system requires a function allowing the user to easily select the music they want to listen to. In order to implement this function, a DB containing detailed information of each track can be used to find the location of the desired music with keywords provided by the user. In this proposed system, the embedded PC-Fi system and remote controller are mutually connected via a WiFi network, and more than one user can remotely control the embedded system with their own mobile device.
Radio map fingerprint algorithm based on a log-distance path loss model using WiFi and BLE
Seong, Ju-Hyeon ; Gwun, Teak-Gu ; Lee, Seung-Hee ; Kim, Jeong-Woo ; Seo, Dong-hoan ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 62~68
DOI : 10.5916/jkosme.2016.40.1.62
The fingerprint, which is one of the methods of indoor localization using WiFi, has been frequently studied because of its ability to be implemented via wireless access points. This method has low positioning resolution and high computational complexity compared to other methods, caused by its dependence of reference points in the radio map. In order to compensate for these problems, this paper presents a radio map designed algorithm based on the log-distance path loss model fusing a WiFi and BLE fingerprint. The proposed algorithm designs a radio map with variable values using the log-distance path loss model and reduces distance errors using a median filter. The experimental results of the proposed algorithm, compared with existing fingerprinting methods, show that the accuracy of positioning improved by from 2.747 m to 2.112 m, and the computational complexity reduced by a minimum of 33% according to the access points.
Bathymetric changes off the sea south of Jinwoo-do Island in the Nakdong River estuary
Park, Bong-woon ; Kim, Sung-bo ; Kim, Jae-joong ; Kim, Ki-cheol ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 69~74
DOI : 10.5916/jkosme.2016.40.1.69
Bathymetric changes were studied in the southern sea off the Jinwoo-do Island, which is one of the deltaic barrier islands surrounding the Nakddong river estuary. In this study, 16 bathymetry data sets were obtained from June 2006 to April 2015. Two narrow channels, the one lying between Jinwoo-do and Shinja-do, and the other one lying between Nulcha-do and Jinwoo-do extended into the eastern and western parts of the study area, respectively. The eastern extension of the channel contained a passage of mixed estuarine waters of seawater and river water discharged from the Nakdong river barrier and the west Nakdong River. The western channel connected the Nakdong River estuary with the Busan New Port via a connecting pier. Total volumetric changes of sediments in study area and discharge flow of the Nakdong river barrier were analyzed. Bottom topographical changes occurred mainly in the eastern extension of the channel. These changes were initially characterized by gradual erosion or deposition followed by rapid restoration. The total volume of sediment gradually increased from June 2006 to March 2013, but experienced a sudden decrease in October 2013 because of typhoon Danas. Few fluctuations were observed from October 2013 to April 2015. Analysis of the cross-sectional bathymetry of the north-south direction showed that the deepest point of the eastern channel moved 100-130 m westward and 200 m northward between June 2006 and April 2015.
Improved efficiency of numerical modeling using the expanding domain method with a logarithmic grid
Hong, Bo-Ram ; Bae, Ho-Seuk ; Ha, Wan-Soo ; Chung, Woo-Keen ;
Journal of the Korean Society of Marine Engineering, volume 40, issue 1, 2016, Pages 75~80
DOI : 10.5916/jkosme.2016.40.1.75
Numerical modeling based on the finite difference method has been widely used with improved computer technology. However, high-capacity computing resources are required for this technique. To overcome this limitation, we propose an algorithm the employs a logarithmic grid in conjunction with the expanding domain method. The proposed algorithm was verified through comparison with numerical results obtained with a conventional method. The results confirmed that our algorithm can improve computational efficiency.