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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Environment & Safety
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Journal DOI :
The Korean Society of Marine Environment and safety
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Volume & Issues
Volume 20, Issue 6 - Dec 2014
Volume 20, Issue 5 - Oct 2014
Volume 20, Issue 4 - Aug 2014
Volume 20, Issue 3 - Jun 2014
Volume 20, Issue 2 - Apr 2014
Volume 20, Issue 1 - Feb 2014
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Long-Term Variations of the Sea Surface Temperature in the East Coast of Korea
Kim, Sang-Woo ; Im, Jin-Wook ; Yoon, Byung-Sun ; Jeong, Hee-Dong ; Jang, Seong-Ho ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 601~608
DOI : 10.7837/kosomes.2014.20.6.601
The purpose of this study was to explore the long-term variability of sea surface temperature (SST) and cluster analysis derived from in-situ data in the coastal oceanographic observation 8 stations (Sokcho, Jumunjin, Donghae, Jukbyeon, Pohang, Janggigab, Ulgi, Gampo) of the East Sea during 1971-2013. As a result of cluster analysis, SST variations in each area could be divided into two groups, which was a group A of Sokcho, Jumunjin, Donghae, and group B of Jukbyeon, Pohang, Janggigab, Ulgi, Gampo. The SST and SST anomalies at Sokcho, Jukbyeon, Pohang and Gampo during 1971-2013 showed the increase-trend with the variations of decadal-scale. Annual SST values also increased remarkably after 1988. The increases of SST for 43 years showed
at Pohang and
at Gampo. In particular, the SST variations of the northern areas were higher than those of southern areas. The seasonal SSTs increased the order of Sokcho-Jukbyeon-Pohang-Gampo in fall and winter and that of Jukbyeon-Sokcho-Pohang-Gampo in spring and summer.
Community Structure and Biological indicator species of Marine Benthic Algal at Intertidal zone in the Three Areas of the East Coast of Korea
Jeong, Hee-Dong ; Hong, Sung-Eic ; Kim, Sang-Woo ; Han, Myung-Seog ; Jang, Seong-Ho ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 609~618
DOI : 10.7837/kosomes.2014.20.6.609
We have been studied for geographic distribution, dominance and inhabitation characteristics of marine algal species at intertidal zones of Geojin in the northern part of east coast of Korea, Jukbyeon in the middle part and Gampo in the southern part in May and August 2014. For the geographic distribution, the three areas (Geojin, Jukbyeon and Gampo) were a characteristic of the temperate region. Geojin dominated with Ulva pertusa and Chaetomorpha moniligera, Jukbyeon dominated with C. moniligera and Chondria crassicaulis, Gampo dominated with Sargassum thunbergii, U. pertusa and Ectocarpus species. C/P, R/P and (R+C)/P, which can represent the marine algal flora, were 0.85, 2.10, 2.94 in Geojin, 0.58, 3.15, 3.73 in Jukbyeon and 0.80, 3.91, 4.71 in Gampo. As a result of cluster analysis, Those regions were divided in two groups, which were a group A of Geojin and group B of Jukbyeon and Gampo. This result was well matched with Jukbyeon and Gampo shared their temperate region character in the geographic distribution study.
Assessment in Habitat Stability of Halophyte by using Mesocosm Experiment
Ryu, Sung-Hoon ; Lee, In-Cheol ; Kim, Kyung-Hoi ; Yoon, Han-Sam ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 619~626
DOI : 10.7837/kosomes.2014.20.6.619
In this paper, it was constructed the halophyte Mesocosm experimental which was used tidal flat and dredged sediment as a substrate material. Depending on the vegetation and substrate material of Mesocosm, Mesocosm A(tidal flat sediment + Salicornia herbacea), Mesocosm B (only dredged sediment), Mesocosm C(dredged sediment + Salicornia herbacea). Monitoring was carried out of Warter quality factots(Chemical Oxygen Demand(COD), Total Nitrogen(T-N), Total Phosphorus(T-P), water temperature, salinity), Sediment factors(Chemical Oxygen Demand(COD), Total Nitrogen(T-N), Total Phosphorus(T-P)) and growth of Salricornia herbacea. Habitat Stability Index of vegetation was calculating by using the monitoring results. HSI of Mesocosm C was calculated from 0.87 to 0.95 as compared to the relatively high HSI in Mesocosm A, it was evaluated to be able to be used in the restoration and construction of the coastal salt marsh with dredged sediment.
Temporal and Spatial Variability of Nutrients Variation in Bottom Layer of Jinhae Bay
Choi, Tae-Jun ; Kwon, Jung-No ; Lim, Jae-Hyun ; Kim, Seul-Min ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 627~639
DOI : 10.7837/kosomes.2014.20.6.627
In respect of the nutrients cycling in coastal environment, regeneration in bottom layer is one of major source of nutrients. We analyzed the bottom water quality at the 14 stations during 9 years from 2004 to 2012 to investigate the characteristics of nutrients at bottom layer in Jinhae Bay. Concentrations of DIN, DIP and DSi showed the large seasonal variation and were higher in summer. Especially, average concentrations of these nutrients were two times higher in hypoxic season than in normoxic season. In summer, high concentrations of DIN, DIP and DSi caused by regeneration were common feature, but spatial distribution of DSi differ from that of DIN and DIP. DIN and DIP were higher in Masan Bay, while DSi was higher in Masan Bay as well as in center of Jinhae Bay. In comparison with DIN and DIP, DSi was significantly affected by nutrients regeneration at bottom layer in whole season. According to time series analysis, DIN concentration was decreased from approximately
. This result induce that Si:N ratio at bottom layer in Jinhae Bay changed from approximately 1 to 3.
Swimming Suitability and Management of Sea Water for Artificial created Swimming in the Southwestern Sea of Korea
Kim, Do-Hee ; Chang, Jin-Ho ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 640~645
DOI : 10.7837/kosomes.2014.20.6.640
This study aimed to determine the swimming suitability of sea and to suggest methods to address the problems on sea water color and green plants growing on sediment in the artificial created swimming in the beach of southwestern Korea. Sea water samples were collected from January to December of 2010 and analysis for SS, COD,
, TP, MPN, sediment IL, ORP and plants on sediment. The results showed that the sea water under the swimming suitability "level of management" based on the relating high levels of SS and TP, but still suitable for swimming on the basis of MPN. Improving exchange seawater flow, dredging, coating and chemical treatment of polluted sediments in addition to removal of point sources and restriction of non point sources in the study area could improve the sea water quality and swimming suitability of the sea.
The State of Marine Pollution in the Waters adjacent to Shipyards in Korea - 1. Analysis of Pollution Incidents occurred in Shipyards
Kim, Kwang-Soo ; Han, Won-Hui ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 646~652
DOI : 10.7837/kosomes.2014.20.6.646
Data of pollution incidents which occurred in shipyards of South Korea for 10 years from 2004 to 2013 were collected and analyzed in order to propose the plans for the prevention of pollution incidents in shipyards. Total number of pollution incidents in shipyards was 103 cases over the nation of Korea for the recent 10 years and the average annual number was about 10 cases, and annual cases tended to increase from 8 cases in 2004 to 23 cases in 2010 and then to decrease to 9 cases in 2013. The location data of pollution incidents showed 32 cases in Busan metropolitan city (31%), 30 cases in Jeonnam (29%), 21 cases in Gyeongam (21%), 5 cases in Jeju (5%), 4 cases in Gangwon (4%), 4 cases in Gyeongbuk (4%), 3 cases in Chungnam (3%) and 3 cases in Incheon metropolitan city (3%). According to the data of work types of shipyards, 60 cases happened during the work of ship repair (58%), 25 cases during the work of ship breakup (24%), 10 cases in the course of ship building (10%) and 8 cases by others (8%). The data of pollutant type showed oil and oily mixtures to be 59 cases (57%), waste paint dust to be 22 cases (21%), iron dust and welding slag to be 13 cases (13%), wastes to be 4 cases (4%), waste FRP powder to be 3 cases (3%), and others to be 2 cases (2%). The plans for the prevention of pollution incidents in shipyards of Korea were proposed as follows; (1) Observance of the related laws and regulations, (2) Establishment and implementation of action plans to prevent areas dense with shipyards from causing pollution incidents, (3) Establishment and implementation of oil pollution prevention plans in shipyards, especially during the ship repair and breakup works, (4) Preparation of measures to solve civil complaints against pollution incidents in shipyards, and (5) Improvement in national management for the control of shipyards.
A Study on the Evaluation of Cabin Thermal Environment and Marine Fuels for Fuel Saving in Summer According to the Improvement of Air Conditioning System - The Case of Training Ship SAENURI -
Han, Seung-Hun ; Kim, Hong-Ryel ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 653~662
DOI : 10.7837/kosomes.2014.20.6.653
In this study, Mokpo national maritime university Training ship Centralizes Air Conditioning System was upgraded by installing onboard an Air-cooled Air conditioner. This resulted in the improvement of the performance and operation. This study compared refrigeration performance to former equipment and improving one. And through the actual measurement study about the cabin thermal environment, it will be used as basic data for marine air conditioning design and plan in the future. At same climate condition, when the Centralized Air Conditioning System and an improved air conditioning system operated, cabin temperature was at
, humidity was 55~75 % as comfortable condition, Generator load measurement showed a saving of 48KW in the average load and 8 % in the full load factor. This also resulted in a saving of daily fuel oil consumption(FOC) at around 222 [
] average. On the other hand, one cadet cabin(Cadet No.21) indicated a higher temperature due to heat transmission of engine room. It found us not to consider installing additional diffuser to reduce the heat transmission.
A Study on Expansion of Anchorage according to increased Trading Volume at Pyeongtaek Port
Lee, Chang-Hyun ; Lee, Hong-Hoon ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 663~670
DOI : 10.7837/kosomes.2014.20.6.663
The Pyeongtaek port is expected lack of waiting anchorage due to increase of incoming ships whit increasing of trading volume in the near future. In case of an anchorage facility's structural alternations and expansion, it should be considered comprehensively how it affects other anchorage facilities. In addition, the volume of ship traffic to relevant area should be estimated accurately and then the facility's scale is calculated. In this paper, researchers calculated cargo per unit ship with the throughput for every ship and predicted the number of ships which had entered Pyeongtaek port. As a result, the port's ability to be docked was predicted to be not enough in 2030. It will exceed the number of ships able to cast anchor at specific two parts simultaneously 12.6 and 1.6 respectively consequently, the necessity to expand the ports was suggested. Hence, the best expansion plan was examined with analysis of marine transportation environment at each ports and the improvements suggested are anchoring ships at Ippado anchorage is 19.7 and the one at Janganseo anchorage is 12.6.
A Study on Inspection Status of Port State Control and Improvement Measures in Korea
Kim, Sun-Tai ; Gang, Sang-Geun ; Jeong, Jae-Yong ; Kim, Deug-Bong ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 671~676
DOI : 10.7837/kosomes.2014.20.6.671
Based on the data of PSC information management system of MOF(Ministry of oceans and fisheries) and APCIS(Asia-Pacific Computerized Information System) of Tokyo-MOU information system, the result of the evaluation on the reality of PSC was done, and base on 2009, it showed a trend of decrease in every DFR(Deficiency Rate) and DTR(Detention Rate). But for vessels built for more than 30 years, flags of convenience vessels, RO-RO ferry and general cargo vessel, small size vessels with gross tonnage less than 1,000 ton showed a high DFR and DTR. Each harbours is classified by the total harbours' average DFR which was 82.5 % and the average DTR was 5.1 %, excluding the Jeju harbour, showing a hugh deviation for classification of each harbour. Classification of each harbour has to be inspected by PSC and it showed a great unbalance of the number of vessels for each territory for inspection. the biggest problem with our country's PSC, where it was pointed out by the PSCO was lack of workers and independent inspection by just one worker. To strength the substantiality of the inspection of our country is to have concentrated inspection on the high risk cautious vessels, forming a human network each classified by four different sectors of the area, recalculating the amount of assignment of inspection classified by each harbour and securing workforce the PSCO improvements are necessary.
Development of Response Scenario for a Simulated HNS Spill Incident
Lee, Moonjin ; Oh, Sangwoo ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 677~684
DOI : 10.7837/kosomes.2014.20.6.677
In response to possible HNS (Hazardous and Noxious Substance) spill accident, HNS spill accident scenario and response scenario were developed. The accident area listed in scenarios is the coastal area of Busan, and scenario for possible accident in the designated area and strategies to respond the accident were developed, respectively. The scenario for accident was developed by designating HNS spill according to risk evaluation of HNS and analysis of HNS spill probability along the coastal area of Busan, and then estimating possible and potential impact from the accident. The scenario for response has been suggested as a systematical responding operations in order to effectively reduce the estimated impact from the accident. The possible HNS spill accident on the seas around Busan, has been designated by the spillage of 1,000ton of xylene due to collision accident in Gamcheon Port, and the possible impacts occurred by the accident has been simulated with the help of the atmospheric and oceanic dispersion model of xylene. In the responding scenario for the accident, a phased strategies regarding emergency rescue of peoples, protection and recovery of xylene, protective measures for the responders, and post management of the accident have been suggested.
Determining the Number of Risk Level Using Real-time Sensitivities in the Probabilistic Maritime Risk Evaluation
Gang, Sang-Guen ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 685~691
DOI : 10.7837/kosomes.2014.20.6.685
The result of probabilistic maritime risk evaluation is represented by the probability(P=0.0~1.0) These results are shown by an index using Risk Acceptance Criteria(RAC) to base the evaluation generally to know the risk level easily. Current RAC is divided into 3 steps, 5 steps, 7 steps, etc. Despite need to evaluate whether the number of RAC for risk evaluation is reasonable, there is not a related research yet. In this study, It was proposed the evaluation method to determine the optimum index number of RAC using the Sensitivity distribution characteristics and the Sensitivity by the index number of RAC. As application result from the proposed method for probabilistic risk evaluation data obtained from the prior studies, It could be determined the optimum index number of RAC by Sensitivity below 10 times and confirmed that the proposed method is reasonable by this study.
A Study on the Decision Making Process of OSC(On-Scene Commander) and On-Scene Command System on Occurring of Disaster at Sea - Focusing on the Sewol Ferry Sinking Case -
Kim, Ki-Hwan ; Choi, Jung-Ho ; Choi, Hyun-Kue ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 692~703
DOI : 10.7837/kosomes.2014.20.6.692
The purpose of this study is to clarify the problems and causes of OSC system of the KCG. In the disaster of sea, the possibility that could expect a reasonable decision making is low. The study has carried out for the different point of view of the problems. The problems have been revealed through the theory and analysis of structural and non-structural aspects for the OSC system, such as inefficient organization system, failure of reasonable decision making, lack of communication with the field. The conclusions of the study have been proposed such as an advanced On-Scene Command system, efficient organization, the training of professional staff, the creating of open organizational culture.
Effect of Social Capital of Coast Guard on Work Satisfaction and Stress
Kim, Jong-Gil ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 704~711
DOI : 10.7837/kosomes.2014.20.6.704
This study examines causal relationships between social capital, works satisfaction and work stress in Korean Coast Guard For this reason, this study conducted review of literature for relevant theories. As a result trust, participation and network were set as factors of social capital. Work satisfaction and work stress were set as subvariables. First, social capital and work satisfaction are high, but work stress is low among Coast Guard officers. Second, social capital of Coast Guard officers impact work satisfaction positively. To be more specific, in order of significance, trust, network, participation have impact on work satisfaction. Third, when examining relationship between social capital and work stress, while participation decreases work stress, network on the other hand causes increase in work stress. Based on these findings, there is a need to promote social capital which impacts work satisfaction and stress of constituents of Coast Guard.
Marine Pollution Prevention Law of North Korea -Legislational and Economic Perspectives
Lee, Yoon ; Chah, Eun Young ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 712~720
DOI : 10.7837/kosomes.2014.20.6.712
In this article, legislational and economic meaning of Marine Pollution Prevention Law (MPPL) of North Korea was studied with review and comparison of North Korea's environmental legislation system. North Korea's MPPL is the basic legislation system against pollution activities. This law has the purpose of gaining of marine environmental protection and resources and declares mainly the marine environmental protection with little definition of action plan and means. To analyze economic achievements of MPPL, more macro- and microeconomic data of North Korea should be accumulated. However, environmental issues are relatively effective to discuss common goal of environmental protection and economical cooperation between Korea and North Korea. To prepare reunification, understanding of North Korea's MPPL is the first step for collaboration of marine environmental conservation.
Loss of Lives caused by Ship Accidents and Corporate Criminal Liability
Kim, Jong-Goo ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 721~729
DOI : 10.7837/kosomes.2014.20.6.721
The purpose of this article is to examine maritime accident and corporate criminal liability in comparison with cases and laws in UK and US. In Anglo-American law, a corporation can be convicted of and sentenced for a criminal offence. However, some theoretical difficulties lie in fixing a corporation with the appropriate mens rea. The Corporate Manslaughter and Corporate Homicide Act 2007 in England is to solve those difficulties and punish a corporation like a natural person. Comparing to Anglo-American law, a corporation is difficult to be punished in Korean law because it is a well recognized theory that only natural person is capable of committing a crime. However, safety in society and workplace is earning great concern in Korea, and emphasis is put on responsibilities of corporations. This article discusses the need for legislation on corporate manslaughter act in Korea with regard to the sinking of the MV Sewol.
The Estimation of Surface Chloride Content and Durability of the Marine Concrete Bridges in South Coast
Jung, Dae-Jin ; Choi, Ik-Chang ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 730~737
DOI : 10.7837/kosomes.2014.20.6.730
In this study, chloride content of marine concrete bridge at the south coast in 5~34years was calculated based on the measured data and the validity of the proposed value was evaluated. Also, correlation of existence of salt injury prevention coating, chloride content, carbonation depth and the compressive strength of marine concrete bridges were derived and relationship of the four was evaluated. According to the research results, surface chloride content value in the tidal zone proposed form KCI 2009 and value in the splash zone and atmospheric zone proposed form Cheong et al.(2005) was the most valid. Also, salt injury prevention coating of marine concrete bridges had the outstanding effect of preventing chloride content penetration, carbonation depth and reduction in the compressive strength. Compressive strength of concrete was reduced by the increase of carbonation depth and chloride content.
Post-buckling Behaviour of Aluminium Alloys Rectangular Plate Considering the Initial Deflection Effect
Oh, Young-Cheol ; Kang, Byoung-Mo ; Ko, Jae-Yong ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 738~745
DOI : 10.7837/kosomes.2014.20.6.738
In this paper, It is performing to the elastic and elasto-plastic large deformation series analysis using a numerical method for the initial deflection effect of the aluminum alloy rectangular plate in the elasto-plastic loading area patch loading size. It is assumed a boundary condition to be a simply supported condition and consider the initial deflection amplitude, aspect ratio. It examined the critical elastic buckling load and post-buckling behaviour of aluminium alloy A6082-T6 rectangular plate. It used a commercial program for the elastic and elasto-plastic deformation series analysis. If the initial deflection amplitude is smaller, the in-plane rigidity with increasing to load is reduced from the start and occurs significantly more increasing the amplitude. More higher the aspect ratio, the initial yield strength is gradually decreased, and the plate thickness thicker and occurs larger than the thin walled plate a reduction ratio of the initial yield strength of the patch loading size as 0.5.
Development of Numerical Tank Using Open Source Libraries and Its Application
Park, Sunho ; Rhee, Shin Hyung ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 746~751
DOI : 10.7837/kosomes.2014.20.6.746
In this paper, ship performance prediction solver was developed using open source computational fluid dynamics (CFD) libraries. The mass- and momentum-conservation equations and turbulent model with a wall function for the turbulent closer were considered. The volume fraction transport equation with a high-resolution interface capturing scheme were selected for free-surface simulation. The predicted wave pattern around KRISO container ship (KCS) using developed program showed good agreement against existing experimental data. For the revolution of a propeller in the propulsive test, general grid interface (GGI) library was used. The predicted propulsive performance showed 7 % difference against experimental data. Two-phase mixture model was developed to simulate a cavitation and applied to a propeller. The sheet cavitation on the propeller was predicted well. From results, the potential of the numerical tank developed by open source libraries was verified by applying it to KCS.
Turbulent-Induced Noise around a Circular Cylinder using Permeable FW-H Method
Choi, Woen-Sug ; Hong, Suk-Yoon ; Song, Jee-Hun ; Kwon, Hyun-Wung ; Jung, Chul-Min ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 752~759
DOI : 10.7837/kosomes.2014.20.6.752
Varieties of research on turbulent-induced noise is conducted with combinations of acoustic analogy methods and computational fluid dynamic methods to analyze efficiently and accurately. Application of FW-H acoustic analogy without turbulent noise is the most popular method due to its calculation cost. In this paper, turbulent-induced noise is predicted using RANS turbulence model and permeable FW-H method. For simplicity, noise from 2D cylinder is examined using three different methods, direct method of RANS, FW-H method without turbulent noise and permeable FW-H method which can take into account of turbulent-induced noise. Turbulent noise was well predicted using permeable FW-H method with same computational cost of original FW-H method. Also, ability of permeable FW-H method to predict highly accurate turbulent-induced noise by applying adequate permeable surface is presented. The procedure to predict turbulent-induced noise using permeable FW-H is established and its usability is shown.
Effect on the Wake Flow according to Various length of Rectangular Cylinder in a Parallel Arrangement
Choe, Sang-Bom ; Cho, Dae-Hwan ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 760~767
DOI : 10.7837/kosomes.2014.20.6.760
An experimental study is carried out to investigate the effect of jet stream in the gab of rectangular cylinders with different length in a parallel arrangement by using PIV method in a circulating water channel. The height(h) of the rectangular cylinder and the gap between the cylinder is 10mm, and the width(B) which is 300mm. The length of the model for flow direction was applied to 30mm, 60mm, 90mm & 120mm, The aspect ratio of a model on the basis of height(H=30mm) is 1, 2, 3 and 4. Reynolds number
based on the height(H) of model for the distance of tidal distributions as of water depth have been applied during the whole experiments. The measurement area was set to 5H rear of the cylinder. As a result, Vortex size in the wake area were increased as velocity increased. and high aspect ratio increased through-flow velocity component in the near wake. Velocity deficit increased highly after near-wake area and low aspect ratio.
Effect of Acetylene Mixing Rate on Synthesis of Carbon Nanotube
Kim, Jae-Hyun ; Lee, Joo-Hee ; Choi, Jae-Hyuk ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 768~773
DOI : 10.7837/kosomes.2014.20.6.768
In this study, experimental and numerical studies for the synthesis of carbon nanotube(CNT) in methane counterflow diffusion flame have been performed. Methane mixed with acetylene(
) was used as a fuel gas and ferrocene was used as a catalyst for synthesis of CNT. The major parameters was
mixing rate and mixing rates were 2 %, 6 %, and 10 %. Characteristics of CNT formation on grid were analyzed from SEM images. the chemical reaction mechanism adopted is GRI-MECH 3.0. Numerical results showed that flame temperature and CO mole fraction were increased with increasing acetylene mixing rate. Experimental results showed that the CNT synthesis in 2% acetylene mixture flame better than that of 6% and 10% acetylene mixture flames. It can be considered that 6% and 10% acetylene mixture flames generated the excessive carbon source and then it interrupted the supplement of the carbon source into ferrocene catalyst. It can be found that the supply of appropriate quantity of carbon source can make effect to synthesis of high purity of CNT.
Characteristics of a CFRP Cruiser's Windage Area by Stability Assessment
Kim, Do-Yun ; Lee, Chang-Woo ; Lee, Dong-Kun ; Oh, Dae-Kyun ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 774~780
DOI : 10.7837/kosomes.2014.20.6.774
This research aims to investigate the superstructure characteristics of the CFRP-yachts whose hulls are made of the light-weight material CFRP. CFRP-yachts, which belong to light-weight yachts, have a tendency of having very small superstructures compared to other vessels of the same length, and such a tendency is closely related to stability. In this research, a comparison of shape characteristics was made between common composite-plastic yachts and CFRP-yachts to find out the shape characteristics of CFRP-yacht. In the meantime, a case study was conducted concerning shape changes in superstructure to understand the effect of such changes on stability. For this purpose the shapes of a total of 10 GFRP-yachts and CFRP-yachts were comparatively analyzed, and the result showed the tendency of their hulls and superstructures. Whereas the case study on stability assessment involved various superstructure shapes of CFRP yachts, for assessment by superstructure size. Stability assessment was according to ISO 12217 (Small craft Stability and buoyancy assessment and categorization). A program was also developed based on stability assessment process due to rolling in beam waves and wind, and it was applied to the case study. The result of the case study showed that the windage area distribution tendency of the yachts whose hulls were made of the light-weight material CFRP was similar to that of the GFRP-yachts, but that the superstructure shapes of the CFRP-yachts were about 50% smaller than those of the GFRP-yachts. In addition, the stability assessment involving various superstructure areas of the CFRP-yachts showed that problems with stability occurred when their superstructure sizes were similar to, or larger by about 10% than, those of the GFRP-yachts.
An Experimental Study on Optical and Physical Properties of Particulate Matter produced from F-76 Marine Diesel and JP-8 Aviation Fuels
Choi, Jae-Hyuk ; Choi, Seuk-Cheun ; Kim, Dae-Yong ; Lee, Joo-Hee ; Park, Seul-Hyun ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 781~787
DOI : 10.7837/kosomes.2014.20.6.781
The dimensionless extinction constants of particulate matter for F-76 diesel and JP-8 aviation fuels were measured at both 633 nm and 853 nm in the transmission cell where the simultaneous gravimetric measurement of PM concentration is compared to the light extinction measurement. For the F-76 diesel PM, the average value of the dimensionless extinction constants at 633 nm was 8.8 whereas that of the dimensionless extinction constants for JP-8 was 9.8 at the same wavelength. As the wavelength is increased to 853 nm, the average value for the F-76 diesel was reduced to 8.2 whereas that for JP-8 was decreased to 8.9.
A Study on Efficient Capacity Control of a Marine Pump with the Variation of Sea Water Temperature
Choi, Sang-Bom ; Im, Myeong-Hwan ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 6, 2014, Pages 788~793
DOI : 10.7837/kosomes.2014.20.6.788
In this study, the electrical power consumption saving effect is studied through installing an inverter which is able to control the R.P.M. of marine sea water pump by effective flow control. The study looks at how sea water pump's flow control influences on the system without the Marine Growths Protection System(MGPS). Auxiliary sea water pump and refrigerator sea water pump in training ships, which are always operated not only in harbor but also in navigation, was used in the experiment and the experiment was conducted by dividing into harbor and navigation. As a result of research, in the case the sea water temperature is under
, the operation was possible with a 58.3 % decrease in pump R.P.M. and electric power consumption was saved by 50 %. In spite of the sea water temperature increasing upto
, pump R.P.M. at 91.6 % was sufficient to operate with a 20 % electric power consumption saving effect. In the pipelines without MGPS, lowering R.P.M. along with lowering pressure results in the attachment of various marine growths.