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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 34, Issue 8 - Nov 2010
Volume 34, Issue 7 - Nov 2010
Volume 34, Issue 6 - Sep 2010
Volume 34, Issue 5 - Jul 2010
Volume 34, Issue 4 - May 2010
Volume 34, Issue 3 - May 2010
Volume 34, Issue 2 - Mar 2010
Volume 34, Issue 1 - Jan 2010
Selecting the target year
Sustainable Development Strategies for Marine Sport Industry
Cho, Woo-Jeong ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 224~234
DOI : 10.5916/jkosme.2010.34.2.224
A Study on the Effect of Scale Roughness attached Surface of Heat Exchangers
Kim, Min-Soo ; Choi, Nag-Jung ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 235~242
DOI : 10.5916/jkosme.2010.34.2.235
An experimental investigation has been conducted to clarify roughness effects of geothermal water scale deposited onto a heating surface upon its forced convection heat transfer characteristics. Examined was a circular cylinder, on which particles of silica scale having five different sizes are uniformly distributed. The Reynolds number was varied from 13000 through 50000. Local and mean heat transfer characteristics were measured as functions of particle size and Reynolds number. Subsequently the mean fouling resistance was estimated from those results, and its characteristics are clarified. It was found that the heat transfer of cylinders greatly varies with the fouling of geothermal water scale, especially its scale height. Further, the local and average Nusselt numbers strongly depend upon the cylinder spacing and the Reynolds number.
Combustion Characteristics of Emulsified C-heavy Oil in Constant Volume Combustion with High Temperature and Pressure
Yoo, Dong-Hoon ; Nishida, Osami ; Fujita, Hirotsugu ; Lim, Jae-Keun ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 243~249
DOI : 10.5916/jkosme.2010.34.2.243
The improvement of fuel economy and the reduction of diesel exhaust PM(Particulate Matter) and
have been successfully achieved by supplying diesel engines with emulsified diesel oil. However, combustion analysis of emulsified C-heavy oil is difficult because the combustion characteristics of emulsified C-heavy oil compared to other fuels have a special form. Therefore, these experimental researches have analyzed the combustion characteristics of emulsified C-heavy oil in a chamber with high pressure and temperature. The pressure and the rate of heat releases in a combustion chamber was decreased with increasing the water content and the ignition delay time was increased with increasing the water percent.
The Characteristics of the Flame Propagation Velocity and Volume Integral of Reaction Rate with the Variation of Nozzle Diameter and Fuel Injection Flow Rate for a Liftoff Flame
Ha, Ji-Soo ; Kim, Tae-Kwon ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 250~258
DOI : 10.5916/jkosme.2010.34.2.250
A numerical analysis of reactive flow in a liftoff flame is accomplished to elucidate the characteristics of flame propagation velocity and volume integral of reaction rate with the variation of nozzle diameter and fuel injection flow rate in a liftoff flame consisted with fuel rich region, fuel lean region and diffusion flame region. The increase of fuel injection velocity enhances flame propagation velocity for the selected three nozzle diameter(d=0.25, 0.30, 0.35mm), but its effect on the flame propagation velocity is not much greater than 4.3%. The increase of fuel flow rate is directly and linearly related with the volume reaction rate and so the volume reaction rate, not the flame propagation velocity, might be considered to accommodate the variation of fuel flow rate in a liftoff flame.
Experimental Study on Compact type CO
Gas Cooler(2) - Experiments and Predictions on Heat Flowrate and Pressure Drop -
Oh, Hoo-Kyu ; Son, Chang-Hyo ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 259~266
DOI : 10.5916/jkosme.2010.34.2.259
The heat flowrate and pressure dorp of
in a multi-tube-in-tube helical coil type gas cooler were predicted using LMTD method and compared with the experimental data. The mass flowrate of
and coolant were varied from 0.06 to 0.075 [kg/s], and the cooling pressure of gas cooler were from 8 to 10 [MPa], respectively. The LMTD method is used to predict the heat flowrate and pressure drop of supercritical
during in-tube cooling. The equations used by LMTD method were Gnielinski correlation for
and Dittus-Boelter correlation for coolant, respectively. The equation used to predict the pressure drop of
and coolant is Blasius correlation. In comparison of heat flowrate and pressure drop of
measured by experiment to that predicted by LMTD method, the experimental heat flowrate and pressure drop of
in the multi-tube-in-tube helical coil type gas cooler shows a relatively good agreement with that predicted by LMTD method.
Study on Robot Manipulator applying the Gravity Compensator
Choi, Hyeung-Sik ; Hur, Jae-Gwan ; Seo, Hae-Yong ; Hong, Sung-Yul ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 267~274
DOI : 10.5916/jkosme.2010.34.2.267
In this paper, the structure of a gravity compensator was studied, and the 6-axis robot manipulator which is newly developed by applying the gravity compensator is presented to improve the torque performance of the robot joint. The kinematics analysis on the robot was presented. Also, a simulation of the performance of the joint actuator of robot adopting the gravity compensator was presented by applying various springs. According to the simulation results, it was validated that the payload effect on the robot joint actuator adopting the gravity compensator is reduced in proportion to the spring intensity of the gravity compensator.
Analytical Study on Performance Evaluation of Large-Sized Silencer using Geometric Similarity Law
Yang, Jun-Hyuk ; Lee, Boo-Youn ; Kim, Won-Jin ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 275~281
DOI : 10.5916/jkosme.2010.34.2.275
In this paper, a geometric similarity law is introduced to the performance test of a large-sized silencer used in ship engine or plant system. A test of scale-down model enable to yield the cost and time saving in developing large-sized silencer considerably. Two types of silencer, resonator and expansion chamber, were analyzed by a theoretical method and an acoustical FEM(finite element method) in order to obtain geometric similarity variables. A method is proposed to estimate the transmission loss of prototype model using the test results of scale-down model. Two actual large-sized silencer, which consist of resonator and expansion chamber, were analysed by an acoustical FE analysis. Consequently, the proposed method predicts effectively the performance of prototype silencers using those of scale-down models.
Characteristics of Capacity Control of Variable Speed Water Cooler with the Electronic Expansion Valve Open/Close Degree
Beak, Seung-Moon ; Moon, Choon-Geun ; Kim, Hyun-Woo ; Jeong, Seok-Kwon ; Yoon, Jung-In ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 282~288
DOI : 10.5916/jkosme.2010.34.2.282
The paper presents the characteristics of capacity control of variable speed water cooler with the electronic expansion valve open/close degree. It is a preliminary study on the optimum control of the water cooler system using a variable speed compressor controlled by inverter. The electronic expansion valve controlled by the variation of compressor speed maintains the constant degree of superheat at the evaporator outlet, which aims to find the degree of superheat obtaining the optimum refrigeration effect. The investigation indicates that there is a point achieving the maximum cooling capacity by the variation of the electronic expansion valve open/close degree with constant compressor speed.
A Study on the Injection Molding Process of Inline Skate Frame Using Moldflow
Lee, Hyoung-Woo ; Park, Chul-Woo ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 289~295
DOI : 10.5916/jkosme.2010.34.2.289
Injection molding process is one of the most important methods to produce plastic parts with high efficiency and low cost. Today, injection molded parts have been increased dramatically the demand for high strength and quality applications. In this study, In-line skates are made of Al alloy and plastic materials to replace the frame for the optimization process is all about. I interpreted through mold design, Injection molding process that minimizes the runner and the gate dimension will determine the size and shape. Runner and gate dimensions of change based on availability of the product, I'll discuss the injection molding. This report investigates that the optimum injection molding condition for minimum of shrinkage. The FEM Simulation CAE tool, Moldflow, is used for the analysis of injection molding process.
Prediction of Deterioration Rate for Composite Material by Moisture Absorption
Kim, Yun-Hae ; An, Seung-Jun ; Jo, Young-Dae ; Bae, Chang-Won ; Moon, Kyung-Man ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 296~302
DOI : 10.5916/jkosme.2010.34.2.296
If the fiber reinforced plastic is exposed to the moisture for a long period of time, most of moisture absorption occurs on the resin place, thus dropping cohesiveness between the molecules as the water molecules permeated between high molecular chains grant high molecular mobility and flexibility. Also as the micro crack occurs due to the permeation of moisture on the interface of glass fiber and epoxy resin, it is developed to the overall damage of interface place. Hence, the study on absorption is essential as the mechanical and physical properties of fiber reinforced composites are reduced. However, the study on absorption has the inconvenience needing to expose composite materials to fresh water or seawater for 1 month or up to 1 year. Therefore, this study has exposed fiber reinforced composites to fresh water and has developed a model with an accuracy of 98% after comparing the analysis value obtained by using ANSYS while basing on the experimental value of property decline by absorption and the basic properties of glass fiber and epoxy resin used in the experiment.
FEA of Copper Tube Rolling Process Using the Planetary Rolling Mill
Lee, Jung-Kil ; Han, Ki-Beom ; Kim, Kwan-Woo ; Choe, Jong-Woong ; Kim, Jae-Hun ; Cho, Hae-Yong ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 303~309
DOI : 10.5916/jkosme.2010.34.2.303
Copper tube rolling process using the planetary rolling mill has been studied by using finite element method. This rolling is process that makes copper tube by three-roll with mannesmann method. Also, rolling process has started from the cold working and finished to the hot working. This rolling process has more advantage that make reduction of process and cost than existing extrusion. This process includes various and complex process parameters. Each of the process parameters affects forming result. Therefore, all of the process parameters should be considered in copper tube rolling. Rolling process for copper tube was successfully simulated and it should be useful to determine optimal rolling condition.
Swing-up and Stabilization Control of a SESIP System
So, Myung-Ok ; Yoo, Heui-Han ; Ryu, Ki-Tak ; Lee, Yun-Hyung ; Lee, Jong-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 310~317
DOI : 10.5916/jkosme.2010.34.2.310
In this paper, we propose a method for swing-up and stabilization of a SESIP(Self-Erecting Single Inverted Pendulum) system which is one of the typical nonlinear systems. We use PV(Proportional velocity) controller for swinging up the pendulum and employ a PI-type state-feedback controller for stabilizing the pendulum. Control is switched to a stabilizing controller, which is designed to balance the inverted position of pendulum and the cart position to the near vertical position. Computer simulations are performed to illustrate the control performance of the proposed scheme.
Structure Analysis of the Light Robot Manipulator Capable of Handling Heavy Payloads
Choi, Hyeung-Sik ; Cho, Jong-Rae ; Hur, Jae-Gwan ; Chun, Chi-Kwang ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 318~324
DOI : 10.5916/jkosme.2010.34.2.318
In this paper, the structure of the gravity compensator has been designed and applied to a light structure of a new 6-axis robot manipulator to enhance its torque performance. Also, analyses on the kinematics and inverse-kinematics of the manipulator have been performed. An FEM analysis has been performed on the structure of robot links to have an excellent performance of delivering 25 kg payload despite of 30kg weight, which is very light compared with other manipulators. Through the FEM analysis, the stability on the vending or fracture of the links of the robot manipulator has been verified.
A Study on a Meander line employing Periodic Patterned Ground Structure on GaAs MMIC
Jung, Bo-Ra ; Yun, Young ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 325~331
DOI : 10.5916/jkosme.2010.34.2.325
In this study, highly miniaturized short-wavelength meander line employing eriodically patterned ground structure (PPGS) was developed for application to miniaturized on-chip passive component on GaAs MMIC (monolithic microwave integrated circuit). The meander line employing PPGS showed shorter wavelength and slow-wave characteristic compared with conventional meander line. The wavelength of the meander line employing PPGS structure was 17 % of the conventional meander line on GaAs MMIC. Due to its slow-wave structure, the meander line employing PPGS exhibited large propagation constant than conventional meander line, which resulted in larger phase shift and shunt inductance value. Above results indicate that the meander line employing PPGS is a promising candidate for application to a development of miniaturized on-chip RF components as well as inductor with a high inductance value on GaAs MMIC.
Detection Technique and Device of Series Arcing Phenomena
Ji, Hong-Keun ; Jung, Kwang-Suk ; Park, Dae-Won ; Kil, Gyung-Suk ; Seo, Dong-Hoan ; Rhyu, Keel-Soo ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 332~338
DOI : 10.5916/jkosme.2010.34.2.332
Annually, electrical fires caused by arcing phenomena in power system rapidly increase as the use of more electric appliances, but there is no established method for the prevention of the accidents. With this background, this paper dealt with the experimental results on a series arc detection technique and a device for air conditioners. Series arcing phenomena that is generated in incomplete connection of air conditioners was simulated, and the frequency spectrum was analyzed. The Fast Fourier Transform (FFT) of the arc pulse showed that the dominant frequency components exist in ranges of 190 kHz~250 kHz and 900 kHz~1.6 MHz. An arc detection circuit with low cut off frequency of 170 kHz to attenuate 60 Hz by 170 dB and a signal discriminator were designed. Also, an algorithm which separate series arc signal from unwanted noises produced by switching operation, inverter, and surge was proposed. Application experiment was carried out on several types of air-conditioners by using the arc generator specified in UL1699, and the results showed the over 99 % accuracy.
Fire Characteristic Analysis of Multi-Use Hostels by Using CFAST
Ha, Ji-Soo ; Yu, Sang-Yeol ; Han, Don-Hee ; Kim, Tae-Kwon ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 2, 2010, Pages 339~345
DOI : 10.5916/jkosme.2010.34.2.339
This study has purpose of minimizing damage from fire incident as analyzing the fire characteristic about fire incident of multi-use hostels, which is increasing recently. For this, CFAST, a verified analysis program for the fire incident was employed to prove the logicality of the study by comparing with a established result of the research work and working the fire simulation for an apartment house. On the basis of this, the study will help to improve safety of fire by analyzing the fire characteristic of Karaoke and Gosiwon which are typical model of multi-use hostels and by establishing how to deal with the fire incident.