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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 29, Issue 8 - Nov 2005
Volume 29, Issue 7 - Nov 2005
Volume 29, Issue 6 - Sep 2005
Volume 29, Issue 5 - Jul 2005
Volume 29, Issue 4 - May 2005
Volume 29, Issue 3 - May 2005
Volume 29, Issue 2 - Mar 2005
Volume 29, Issue 1 - Jan 2005
Selecting the target year
The Latest Technology of Electric Propulsion Ship
Nam Taek Kun ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 149~153
A Study on Combustion Characteristics of Methanol Blended Fuel in Constant Volume Combustion Chamber
Cho Haeng Muk ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 154~160
The result of combustion experiment by using the methanol-gasoline blended fuel showed that the supplying pressure appeared the maximum pressure between equivalent rate 1.1 and 1.2. and the evaporation of the fuel has been known to have been greatly influenced by surrounding temperature and the combustion chamber temperature after being injected from the injector And it is confirmed that the rate of evaporation had been suddenly dropped according to the temperature in the combustion chamber though the injected foe) had been fully evaporated Such tendency has visibly appeared when the zone is leaner. and we recognize that the rich fuel supply is needed in the operation of cold operating.
Effect of Number of Heating Walls on Heat Transfer in the Reciprocating Square Channel
Kim Myung Ho ; Bae Sung Taek ; Ahn Soo Whan ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 161~167
The improvements of the propulsive engine efficiencies could reduce the fuel consumption. Therefore. for a marine main diesel engine the substantial increase of stroke bore ratio. so that the engine speed can be significantly reduced in order to increase the Propulsive efficiency. As a typical example. a Sulzer RTA 60C engine has acylinder diameter of 600 mm and each cylinder is capable of delivering 2.369 kW in the speed range 91-114 rpm. In order to Provide basic data for thermal system of marine engine. this work performs an experimental study of heat transfer in a square channel with one rib-roughened wall under sin91e mode of reciprocating oscillation. A selection of heat transfer measurements illustrates the manner by which the reciprocating channel with two opposite heating walls has the higher heat transfer Performance than with four heating wall.
Natural Convection in a Three Dimensional Inclined Enclosure
Bae Dae Seok ; Kwon Oh Boong ; Kim Hyun Ho ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 168~176
In an inclined enclosure with the upper part cooled and the lower part heated, quantitative data of the temperature and velocity are obtained simultaneously using thermo-sensitive liquid crystals. Experimental results are Presented for Pr=909. aspect ratios of 1/14. 2/14 and 3/14, angle of inclination, 0
45 to the horizontal line. The numerical results are obtained in the same conditions as experiments by the finite volume method and its results are compared with experimental results. It is found that the number of cell is decreased with increasing the angle of inclination. and a unicell is formed at nearby 6=30
which is not affected by the aspect ratio.
PIV Measurement on Ice Slurry Pipe Flow
Doh Deog Hee ; Kim Dong Hyuk ; Oh Cheol ; Hong Seong Dae ; Park Seong Ryong ; Hwang Tae Gyu ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 177~184
Experimental studies on the characteristics of ice slurry flows in a circular pipe is rare due to the deficiency of conventional measurement techniques. In this report the flow characteristics are quantitatively investigated by the use of PIV technique concerning the Ice Packing Factor(IPF) and the power changes of pump motor It was experimentally verified that the power loss does not increase any more at a certain IPF value.
A Study on the Composition of Atkinson Cycle and Thermodynamically Analysis for a Diesel Engine
Kim Chul Soo ; Jung Young Guan ; Jang Tae lk ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 185~193
The present study composed a diesel-atkinson cycle of high expansion as a method of achieving high efficiency in diesel cycle engines. It also interpreted the cycle engine thermodynamically analysis to determine the possibility of the improvement of thermal efficiency and clarified the characteristics of several factors . According to the result of theoretical analysis, heat efficiency was highest when expansion-compression ratio Reど:1. In addition. diesel engines with high apparent compression ratio had higher expansion-compression ratio than otto engines and consequently their effect of high expansion was high. which in turn enhanced thermal efficiency. When the atkinson cycle was implemented in a real diesel engine by applying the miller cycle through the variation of the closing time of the intake valve, the effective compression ratio and the quantify of intake air decreased and as a result, the effect of high expansion was not observed. Accordingly. the atkinson cycle can be implemented when the quantity of intake air is compensated by supercharge and the effective compression ratio is maintained at its initial level through the reduction of the clearance volume. In this case. heat efficiency increased by
at the same expansion-compression ratio when the apparent compression ratio was 20 and the fuel cut off ratio was 2. As explained above, when the atkinson cycle was used for diesel cycle. heat efficiency was improved. In order to realize high expansion through retarding the intake value closing time, the engine needs to be equipped with variable valve timing equipment, variable compression ratio equipment and supercharged Pressure equipment. Then a diesel-atkinson cycle engine is realized.
The Effect of Spot Welding on the Stiffness of Closed Thin-Walled Members
Park Yong Kuk ; Kim Jin Gon ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 194~201
For engineers in the industry, this study considers a reliable and practical finite element modeling technique to estimate the behavior of closed thin-walled members with spot weldings. Dynamic and static experiments confirm that the technique - modeling the spot weldings with solid elements which have the adjusted rotational freedoms and fill the welding space - Yields satisfactory results. Numerical studies on the double hat-shaped members. adopting this modeling technique. show the effect of the spot welding Pitch and the spot welding location in the flange on the stiffness of the members Using the principal stiffness and newly proposed GSPI(global stiffness performance index), we also carefully examine how the spot welding curvature, and sectional shape, etc.. synthetically influence the stiffness of a real excavator pillar in the field.
Fatigue Life Analyses and Improvement of Structural Design of a Heating Drum for the Medium Density Fiberboard
Lee Boo Youn ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 202~208
Stress and fatigue life analyses are performed to enhance a fatigue life of a heating drum of the roller press for medium density fiberboard. The finite element method employing the submodel is used to analyze stress concentration in the journal of the heating drum. The fatigue life is evaluated by the stress-life theory. Two modified designs of the journal are suggested and evaluated to reduce the maximum stress and to increase the fatigue life Their structural reliabilities are verified in terms of the yield strength and the design life
Improvements of Temperature Field Measurement Technique using Neural Network
Doh Deog Hee ; Kim Dong Hyuk ; Bang Kwang Hyun ; Moon Ji Seob ; Hong Seong Dae ; Chang Tae Hyun ; Hwang Tae Gyu ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 209~216
Thermo-chromic Liquid Crystal(TLC) particles were used as temperature sensor for thermal fluid flow. 1K
1K CCD color camera and Xenon Lamp(500w) were used for the visualization of a Hele-Shaw cell The characteristic between the reflected colors from the TLC and their corresponding temperature shows strong non-linearity A neural network known as having strong mapping capability for non-linearity is adopted to quantify the temperature field using the image of the flow. Improvements of color-to-temperature mapping was attained by using the local color luminance (Y) and hue (H) information as the inputs for the constructed neural network.
A Study On Preprocessing of Fingerprint Image Using Multi-Scale Roof Edges
Kim Soo Gyeam ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 217~224
A new roof edge detection method based on multi level scales of wavelet function is proposed in this paper roof edge and its direction are obtained in this new methods at one time. Besides. scale characteristics of detecting roof edge is analyzed. And a few new methods on fingerprint image pre-processing are described. A method segmenting foreground/background of fingerprint images is proposed, in which Prior estimation of direction field is not required any more. A segmentation method based on multi-scale roof edges is implemented. and the valid scale range of the method is defined. too. And the method is used to segment ridges and valleys in fingerprint images simultaneously The exact direction fields made up of the direction of each point in ridges can be obtained when detecting ridges exactly based on the roof edge detector, in comparison with the traditional coarse estimation of direction fields. Obviously. it will establish a solid foundation for the sequent fingerprint identification.
Design of GA-Fuzzy Controller of TCSC for Enhancement of Power System Stability
Chung Mun Kyu ; Chung Hyeng Hwan ; An Byung Chul ; Wang Yong Peel ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 225~235
In this Paper, it was designed the GA-fuzzy controller of a Thyristor Controlled Series Capacitor(TCSC) for enhancement of power system stability. The newly designed controller of TCSC was designed to overcome the nonlinearity such as operating point change of power system as well as to respond to disturbances as uncertainties of line parameters and line fault. So, fuzzy controller by intelligent control theory was used for it. And the fuzzy controller was optimized from a genetic algorithm for complements the demerit such as the difficulty of the component selection of fuzzy controller namely. scaling factor. membership function and control rules. Nonlinear simulation results show that the proposed control technique is superior to conventional PSS in dynamic responses over the wide range of operating conditions and is convinced robustness and reliableness in view of structure.
Modeling and Development of an Integrated Controller for a Ship with Propellers and Additional Propulsion Units
Kim Jong Hwa ; Lim Jae Kwon ; Lee Byung Kyul ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 236~242
Dynamic Positioning(DP) system maintains ship's position (fixed location or predetermined track) exclusively by means of CPPs and thrusters. To generate the control input adequate to various situation an integrated controller for CPPs and thrusters is required. The integrated controller is composed of a thrust calculation algorithm and a thrust allocation algorithm. The thrust calculation algorithm generates thrusts in the surge direction and the sway direction from the desired forward and lateral speed and generates a moment about the yaw axis from desired heading angle. The thrust allocation algorithm allocates the generated thrusts and moment to each CPP and thruster. Computer simulations are executed to confirm the effectiveness of the suggested controller.
An Improvement Technique for the Efficiency of Switch-mode boost Rectifiers By an Parallel Converter
Kim Yoon Sik ; Kim Seong Hwan ; Oh Sae Gin ; Lee Sung Geun ; Jeon Nae Sock ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 2, 2005, Pages 243~250
A new technique for improving the efficiency of single-Phase high-frequency switch-mode boost rectifiers is proposed. This rectifier includes an additional boost converter that parallels the main high-frequency switching device. The additional converter. which is controlled at lower frequencies. bypasses most of the current in the main switch and the high frequency switching loss is greatly reduced accordingly. The rectifier works cooperatively in high efficiency and as if it were a conventional rectifier with one switching device. The proposed scheme is verified by computer simulation using software PSIM.