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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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
Introduction of LNG Carrier
Lee Kyo-Sung ; Jang Hae-Ki ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 341~348
Propulsion System for LNG Carrier
Chung Hun-Kyung ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 349~356
Reliquefaction Systems for LNG Carrier
Song Young-Sik ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 357~362
Sailing of Model Ship with Propulsion Mechanism of Weis-Fogh type
Oh Se-Kyung ; Park Ji-Tae ; Kong Tae-Hue ; Ro Ki-Deok ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 363~368
A mechanism of hovering flight of small insects which is called the Weis-Fogh mechanism is applied to ship propulsion. A model of the propulsion mechanism is based on a two-dimensional model of the Weis-Fogh mechanism and consists of one or two wings in a square channel. A model ship equipped with this propulsion mechanism was made. and working tests were performed in a sea. The model ship sailed very smoothly and the moving speed of the wing was small compared with the advancing speed of the ship.
Job Deployment and Dynamic Routing for Container-AGVs
So Myung-Ok ; Lee Hyun-Sik ; Jin Gang-Gyoo ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 369~376
In recent years, AGVs(Automated Guided Vehicles) have received growing attention as a subsystem of the integrated container operating system which enables unmanned control. improvement of job reliability, accuracy and productivity. Therefore, a number of works have been done to enhance the performance AGVs. In this paper. job deployment and a dynamic routing control system composed of supervisor, traffic controller. motion controller and routing table are discussed. A simple job deployment scheme and an efficient dynamic routing algorithm incorporating with the deadlock prediction and avoidance algorithm are investigated.
Flow Characteristics of Vertical Upward Gas-Liquid Two-Phase Flow
Choi Bu-Hong ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 377~383
This paper deals with the flow characteristics of air-water two-phase flow in a vertical tube of 10mm I.D. and 600mm in length at an adiabatic condition. The obtained experimental data were covered with the liquid superficial velocity ranging from 0.095m/s to 2.56m/s. and the gas superficial velocity ranging from 0.032m/s to 21.08m/s. The effects of the gas and liquid superficial velocity on the flow pattern transitions, frictional pressure drop, and film thickness and gas-liquid interface roughness were also examined. It was found that the film thickness increased and the liquid film wave length was more longer with the liquid superficial velocity
constant. It was also showed that the frictional pressure drops were experienced in three regions. namely increasing region(bubbly flow), decreasing region (Taylor bubble and slug flows) and re-increasing region (annular flow).
A Study on the Multi-wireless Communication Using Cnet Protocol for PLC
Rhyu Keel-Soo ; Lee Hoo-Rach ; Chung Kyung-Yul ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 384~390
This paper addresses the design and implementation of a wireless network. proposed as a cost-effective support platform for PLCs. With this network. one or more supervising stations may access remote equipment like PLCs. An applicable communication methods are described and we applied efficient method among them to PLCs communication. The paper specifies these requirements and indicates methods to fulfill them. Also. it provides to the model of operation, and focuses on the implementation approach. The hardware and software design is described together with a number of critical points related to wireless communication on the Cnet. Furthermore, a discussion on system expandability and performance is tackled and some observations are stated. The main conclusion is, that the proposed method can feature good performance under normal operating conditions.
Application of G-equation to large eddy simulation of turbulent premixed flame around a bluff body inside a cylindrical chamber
Choi Chang-Yong ; Park Nam-Seob ; Ko Sang-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 391~398
In this investigation, turbulent premixed combustion and flame front propagation in a gas turbine combustion chamber is studied. Direct numerical simulation of turbulent reacting flows demands extremely high computational resources, especially in more complicated geometry. The alternative choice may be left for Large Eddy Simulation (LES) by which only large scales are solved directly. In combustion problems, capturing the large scales' behavior without solving the details of small scales is a difficult task. Using a transport equation for description of the flame front propagation and therefore avoiding the calculation of inner flame structure is the basic idea of this study. For this purpose. the so-called G-equation has been used by which any iso-level of the G variable provides the flame location. A comparison with the experiment indicates that the present method can predict a turbulent velocity field and also capture a instantaneous 3-dimensional flame structure.
A Study on Corrosion Properties of welded Alloy 625 for Ship Structure by Shielding Gases Composite Ratio
An Jae-Pil ; Park Keyung-Dong ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 399~406
Alloy 625 is used widely in industrial applications such as aeronautical aerospace, chemical, petrochemical and marine applications. Because of a good combination of yield strength. tensile strength, creep strength, excellent fabricability, weldability and good resistance to high temperature corrosion on prolonged exposure to aggressive environments. High qualify weldments for this material are readily produced by commonly used processes. But all of processes are not applicable to this material by reason of unavailability of matching, position or suitable welding filler metals and fluxes may limit the choice of welding processes. Recently, the flux cored wire is developed and applied for the better productivity in several welding position including the vortical position. In this study. the weldability and weldment characteristics of Alloy 625 are evaluated in FCAW weld associated with the several shielding gases(
) in viewpoint of welding productivity. The results of the experimental study on corrosive characteristics of Alloy 625 are as follows; There is no remarkable difference among shielding gases. however they has a striking difference among corrosive solutions by results of distinguished density and time of corrosive solution. Generally, the shielding gases(
) was superior to the other gases on high temperature tensile and a low temperature impact. but all of the shield gases were making satisfactory results on corrosion test.
Research on the Heat Exchanger for Kimchi Refrigerator Using Thermal Conductive Plastic
Kang Tae-Ho ; Baek Jong-Yong ; Kwon Yong-Ha ; Kim In-Kwan ; Kim Young-Soo ; Sin Dae-Sik ; Park Jae-Hong ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 407~416
The kimchi refrigerator is the electric home appliance which is used for the maturing and preserving of the kimchi in domestic and foreign market. The kimchi refrigerator is composed in 3 main parts as insulation. kimchi container, machinery room. The heat exchanger of kimchi refrigerator is made of aluminum and the other parts are made of steel and polymer. Also, kimchi refrigerator is expensive and heavy as compared with same class of refrigerator until now. In the present study, the possibility to replace heat exchanger from aluminum to thermal conductive plastic was analyzed and experimented. The thermal conductive plastic has
times heat conductivity than that of normal plastic. It is known that heat transfer process is dependent not only conduction but convection or radiation. Thermal conductivity of the applied material in this research is over than 2 W/mK, thermal conductivity doesn't play a vital role on heat transfer. In this study, temperature is the most important parameter on the kimchi refrigerator and the temperature of kimchi refrigerator's heat exchanger was measured and compared with the temperature calibrated by CFD analysis on the inside wall of the kimchi refrigerator. It is important to keep constantly the inside temperature of the Kimchi refrigerator. Besides numerical analyses for the new thermal conductive plastic for heat exchanger were executed with the various height of evaporation tube. A series of experiments were conducted to compare the performance of the two heat exchanger made of aluminum and thermal conductive plastic at the same condition and certified the possibility of the thermal conductive plastic. According to these results, it was confirmed that the conventional aluminium heat exchanger can be replaced by thermal conductive plastic successfully.
An Experimental Study on the Wake behind a Round Cylinder with Swirling Flow in the Horizontal Circular Tube
Chang Tae-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 417~425
An experimental study is performed on the turbulent swirling flow behind a crcular cylinder using 2-D PIV technique. The Reynolds numbers investigated are 10.000, 15,000. 20.000 and 25.000. The mean velocity vector, time mean axial velocity, turbulence intensity, kinetic energy and Reynolds shear stress behind the cylinder are measured before and behind the cylinder along the test tube. A comparison is included without swirling flow behind a circular and square cylinder. The recirculation zones are shown unsymmetric profiles.
A Effect of Shot Peening for Fatigue Life of Spring Steel for Vessel Application
Ryu Hyung-Ju ; Park Keyung-Dong ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 426~435
The lightness of components required in automobile and machinery industries is requiring high strength of components. Therefore this requirement is accomplished as the process of shot-peening method that the compressive residual stress is made on the metal surface as one of various improvement methods. Special research is, therefore, needed about compressive residual stress on the metal surface in the process of shot-peening method. Therefore, in this paper the effect of compressive residual stress of spring steel(JISG SUP-9) by shot-peening on fatigue crack growth characteristics in environmental condition(temperature) and mechanical condition(shot velocity, stress ratio) was investigated with considering fracture mechanics. By using the methods mentioned above, the following conclusions have been drawn. (1) The fatigue crack growth rate(da/dN) of the shot-peened material was lower than that of the un-peened one. In high temperature range. fatigue crack growth rate decreased with increasing temperature range, while fatigue crack growth rate increased by decreasing temperature in low temperature. (2) Fatigue life shows more improvement in the shot-peened material than in the un-peened material. And compressive residual stress of surface on the shot-peen processed operate resistance force of fatigue crack propagation.
Development of Cooling System for Electronic Devices using Oscillating Capillary Tube Heat Pipe
Kim Jong-Soo ; Ha Soo-Jung ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 436~442
Rapid development of electronic technology requires small size, high density packaging and high power of electronic devices. In this paper, characteristics on oscillating heat pipe according to operating conditions (environment temperature, charging ratio of working fluid, inclination) based on experimental study was investigated From the experimental results
(environment temperature) R-141b (working fluid)
(charging ratio) was best performace at others of inclination angle and the top heating mode of OCHP performed
efficiency of the bottom heating mode.
A Study on the Emission Reduction and Performance Improvement in a V8 Type TCI D.I. Diesel Engine
Yoon Jun-Kyu ; Lim Jong-Han ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 443~452
The purpose of this study is experimentally to analyze the effects of intake port swirl, injection system and turbocharger on the engine performance and the emission characteristics in a V8 type turbocharger intercooler D.I. diesel engine of the displacement 16.7L, and to suggest the improvement of engine performance. Generally to enhance engine power, TCI diesel engine is put to practically use turbocharged intercooler in order to increase volume efficiency which is cooled boost air. As results of considering the factors of the intake port of swirl ratio 2.25, compression ratio 17.5. re-entrant
combustion bowl, nozzle hole diameter
. nozzle protrusion 3.18mm, injection timing BTDC
and turbocharger(compressor 0.6A/R+46Trim. turbine 1.0 A/R+57Trim) is the best in the full load in the engine performance and the exhaust characteristics of NOx concentration. Therefore. their factors are appropriated as intake system, injection and turbocharger system.
The Effect of Surface Roughness on the Zero Pressure Gradient Turbulent Boundary Layers
Kim Moon-Kyung ; Yoon Soon-Hyun ; Kim Dong-Keon ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 4, 2005, Pages 453~460
Experiments were conducted to investigate the effect of the surface roughness on the flat plate turbulent boundary layer. The square rods were installed at the leading edge to make surface roughness. The particle image velocimetry was used to measure the mean velocities and velocity fluctuation component. All measurements were made over a range of w/k=1. 2 5 and
. Friction velocity was measured by using Clauser plot method. The level of turbulent intensities on roughness surface appears more strongly than that of turbulent intensities on flat plate. A correlation of boundary layer thickness in term of
and w/k are presented.