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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 31, Issue 8 - Nov 2007
Volume 31, Issue 7 - Nov 2007
Volume 31, Issue 6 - Sep 2007
Volume 31, Issue 5 - Jul 2007
Volume 31, Issue 4 - May 2007
Volume 31, Issue 3 - May 2007
Volume 31, Issue 2 - Mar 2007
Volume 31, Issue 1 - Jan 2007
Selecting the target year
Amendment to MARPOL73/78 Annex VI
Doo, Hyun-Wook ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 486~493
DOI : 10.5916/jkosme.2007.31.5.486
Some Considerations on Effects of IMO Resolutions
Lee, Yun-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 494~505
DOI : 10.5916/jkosme.2007.31.5.494
Development and Application of Static Mixer
Yang, Hei-Cheon ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 506~513
DOI : 10.5916/jkosme.2007.31.5.506
One of the most widely used static mixers is Sulzer type mixer. However the structure of the element is so complicated that the mixing efficiency is better than others, whereas the pressure drop is larger than the others. Therefore new elements are necessary to reduce the pressure drop and to minimize the decrease of the mixing efficiency compared with the Sulzer ones. The objectives of this study are to develop new static mixer and to perform the experimental investigation in order to evaluate the performance of the new one, and to investigate the applicability of the one in an inline coagulant mixing system for water treatment, The pressure drops of the new static mixer elements were about 4-12% lower than that of the Sulzer SMX one, and the mixing efficiency of the Sulzer SMX one was about 2-5% higher than that of the new ones. The inline coagulant mixing system with a new static mixer element performed significantly better than the traditional mechanical mixing system for turbidity removal.
Performance Analysis and Optimum Design Method of Positive Displacement Turbine for Small Hydropower
Choi, Young-Do ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 514~521
DOI : 10.5916/jkosme.2007.31.5.514
There has been considerable interest recently in the topic of renewable energy. This is primarily due to concerns about environmental impacts. Moreover, fluctuating and rising oil prices, increases in demand, supply uncertainties and other factors have led to increased calls for alternative energy sources. Small hydropower, especially using water supply system, attracts high attentions because of relatively lower cost and smaller space requirements to construct the plant. Moreover. newly developed positive displacement turbine has high acceptability for the system. Therefore, the purpose of this study is focused on the examination of the performance characteristics and proposition of a optimum design method of the turbine for the improvement of the performance. The results show that newly proposed optimum design method for the turbine has high accuracy of performance prediction and good applicability for the performance improvement of the turbine.
Performance Prediction Method of n Positive Displacement Turbine with 4-Lobe Helical Type Rotor
Choi, Young-Do ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 522~530
DOI : 10.5916/jkosme.2007.31.5.522
In order to extract small hydropower in the very low specific speed range of $n_s<10$, a Positive Displacement Turbine (PDT) has been proposed and steady performances have been determined experimentally. However, the suppression of large pressure fluctuation is inevitable for practical application of PDT. Therefore, present study adopted 4-lobe helical type robe to reduce the pressure fluctuation. The results show that 4-lobe helical type robe can be adopted to suppress the pressure fluctuation drastically. Moreover, efficiency and unit power of the turbine with newly proposed 4-lobe helical type lobe are higher than those of the turbine with 3-lobe straight type robe.
Simultaneous Temperature and Velocity Fields Measurements near the Boiling Point
Doh, Deog-Hee ; Hwang, Tae-Gyu ; Koo, Bon-Young ; Kim, Seok-Ro ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 531~542
DOI : 10.5916/jkosme.2007.31.5.531
Simultaneous measurement technique for temperature and velocity fields near a heated solid body has been constructed. The measurement system consists of a 3-late CCD color camera, a color image grabber, a 1ighting system, a host computer and a software for the whole quantification process. Thermo Chromic Liquid Crystals (TCLC) was used as temperature sensors. A neural network was used to get a calibration curve between the temperature and the color change of the TCLC in order to enhance the dynamic range of temperature measurement. The velocity field measurement was attained by the use of the fray-level images taken for the flow field, and by introducing the cross-correlation technique. The temperature and the velocity fields of the forced and the natural convective flows neat the surface of a cartridge heater were measured simultaneously with the constructed measurement system.
Performance Characteristics of Water-Chilling Heat Pump Using CO
on the Variation of Secondary Fluid Conditions
Son, Chang-Hyo ; Oh, Hoo-Kyu ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 543~551
DOI : 10.5916/jkosme.2007.31.5.543
The performance characteristics of water-chilling heat pump using
with respect to variation of inlet temperature and mass flow rate of secondary fluid was investigated experimentally. An experimental apparatus is consisted of a compressor, a gas cooler, an expansion valve, an evaporator and a liquid receiver. All heat exchangers used in the test rig are counter-flow-type heat exchangers with concentric dual tubes, which ate made of copper. The gas cooler and the evaporator consist of 6 and 4 straight sections respectively arranged in parallel, each has 2.4 m length. The experimental results were summarized as the followings : As inlet temperature of secondary fluid in the gas cooler increases from
, the compressor work, heating capacity and heating COP were varied to 37.8%, -13%, -35.9%, respectively. The heating capacity, compressor work, heating COP were turned into 23.3%, 6.42%, 13.1%, respectively when ass flow rate of secondary fluid in the evaporator increases from 70 g/s to 150 g/s. The above tendency is similar with performance variation with respect to temperature variation of secondary fluid in the conventional vapor compression cycle.
A Study on the Drag Reduction Effect and Heat Transfer Enhancement of Non ionized Surfactant and Water Mixture in a Circular Pipe Flow
Kim, Myoung-Jun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 552~557
DOI : 10.5916/jkosme.2007.31.5.552
This paper has dealt with the effect of non ionized surfactant and water mixture on drag reduction and heat transfer enhancement in a circular pipe flow with experimentally. The test section was consisted of stainless steel pipe with inside diameter of 16mm. The wire coil was used to increase heat transfer in a pipe and the on ionized surfactant(Oleyl Dihydroxyethyl Amino Oxide, ODEAO) was used to reduce the drag force of water mixture with surfactant. The main parameters of this experiment were diameter and pitch of wire coil and the ratio of test section length and horizontal wire coil length. In this experiment, the acquired results were 1) Drag reduction effect existed in this ODEAO-water mixture, 2) Friction factor and heat transfer were increased with insertion the heat transfer enhancement coil, 3) With increasing of pitch ratio, heat transfer was decreased, and 4) Heat transfer was decreased by the decreasing of inserting coil diameter.
Performance Characteristics of Water-Chilling Heat Pump Using CO
on Variation of Refrigerant Charge Amount
Son, Chang-Hyo ; Yu, Tae-Guen ; Jang, Seong-Il ; Oh, Hoo-Kyu ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 558~566
DOI : 10.5916/jkosme.2007.31.5.558
The performance characteristics of water-chilling heat pump using
with respect to variation of refrigerant charge amount was investigated experimentally. An experimental apparatus is consisted of a compressor, a gas cooler, an expansion valve, an evaporator and a liquid receiver. All heat exchangers used in the test rig are counter-flow-type heat exchangers with concentric dual tubes, which are made of copper. The gas cooler and the evaporator consist of 6 and 4 straight sections respectively arranged in parallel, each has 2400 mm length. The experimental results summarize as the followings : As the refrigerant charge ratio of
heat pump system increases, the discharge pressure and compressor ratio increases, but mass flow rate of refrigerant decreases. Also the compressor work increases with the increase of refrigerant charge ratio. However, the heating and cooling capacity of
heat pump decreases as the refrigerant charge ratio increases. The maximum heating COP of
heat pump system presented at 0.25 refrigerant charge ratio. It is possible to confirm the optimum charge ratio of
heat pump system by the viewpoint of heating COP.
Weldability of aluminum alloys by multi-wavelength laser beam
Kim, Jong-Do ; Kim, Jeong-Mook ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 567~574
DOI : 10.5916/jkosme.2007.31.5.567
Aluminum and aluminum alloys have high rate of lightness, recycling property and excellent specific strength. Fields using them have been widening because they ould satisfy both energy reduction and high efficiency in manufactures production. But they have many problems on welding due to high thermal conductivity and reflectivity, so the study to solve these problems ate proceeding actively around the world. This study was purposed to improve weldability and spread application range for aluminium alloys by using the unique property of aluminium which absorb high energy around
wavelength and the higher temperature, the mote absorbtion of laser beam on preheating by multi-wavelength laser beam(pulsed Nd:YAG laser + diode laser with
wavelength). The favorable mechanical properties were acquired by the test results of strength, hardness and leak of weld metal which had reduced its defect like crack and so on.
Implementation and Evaluation of the 100 Watt High Power Amplifier for Broadband Digital TV Repeater
Sung, Jeon-Joong ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 575~582
DOI : 10.5916/jkosme.2007.31.5.575
In this paper, a 100 Watt high power amplifier has been implemented and performed evaluation, which is operating at UHF band (
) for Digital TV repeater. To achieve increase of bandwidth and high power capability, 3-way power combiner and divider of Wilkinson type was adopted. In order to measure the fabricated 100 Watt power amplifier, the estimation technique function which makes equivalent mask was used. As a result of the measurement, the existence of pilot signal is confirmed and the signal transmitted at the rated output power 100 Watt is brought out the flat feature through 6 MHz bandwidth. and it resulted that its value was less than -47 dB at the edge of radiation channel and less than -110 dB at more than 6 MHz position from channel edge.
Research into The Future Development of the Hybrid System for Buoy
Lee, Ji-Young ; Kim, Jong-Do ; Lee, Jong-Ho ; Lee, Jin-Yeol ; Oh, Jin-Seok ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 583~591
DOI : 10.5916/jkosme.2007.31.5.583
This paper reports the performance of a 150W PV-wave hybrid system with battery storage in buoy. This system was originally designed to meet a new hybrid ower system for buoy in Korea. In the case or lighted buoys and lighthouses, a light failure alarm system of wireless radio is attached so that light failures are immediately notified to the office. At lighthouse offshore fixed lights and light buoys where commercial electricity is not available, the power source depends on solar system and batteries. This power system has a various problems. Therefore energy derived from the sunshine, wind and waves has been used as the energy source lot aids to navigation. Recently a hybrid system of combining the solar, wind and the wave generator is a favorable system lot the ocean facilities like lighthouse and buoy. The hybrid system in this paper is intended for variable DC load like light, communication system in the buoy and includes a PV-wane generation system and battery. This is composed a high efficiency charging algorithm, switching converter and controller. This paper includes discussion on system reliability, power quality, and effects of hybrid system in the buoy. Simulation and experimental results show excellent performance.
A Study on the Energy Saving Method by controlling Capacity of Sea Water Pump in Central Cooling System for Vessel
Lee, Ji-Young ; Yoo, Heui-Han ; Kim, Yun-Hyung ; Oh, Jin-Seok ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 592~598
DOI : 10.5916/jkosme.2007.31.5.592
The fuel charge is getting higher in navigation cost. Therefore, shipowners try to find the method for reducing oil consumption. ESS(Energy Saving System) is one of he method. ESS is the system consisted with two inverters, ESS control unit and monitoring system. Two inverters control two main sea water cooling pumps. In the ESS control Unit, the control algorithm finds optimized point to decrease a power consumption of main sea water cooling pumps. Monitoring system observes ESS not to work improperly. ESS is experimented in the laboratory with real condition and analyzed in every view. After experiment, the result of the experiment shows that the control algorithm works correctly and safely. ESS has a plan to be operated in the ship soon. In that case, additional devices are needed to connect ESS with cooling system of the vessel. So the development of addition device is needed and being studied.
System Identification by Real-Coded Genetic Algorithm
Ahn, Jong-Kap ; Lee, Yun-Hyung ; Jin, Gang-Gyoo ; So, Myung-Ok ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 599~605
DOI : 10.5916/jkosme.2007.31.5.599
This paper presents a method for identifying various systems based on input-output data and a real-coded genetic algorithm(RCGA). The advantages of this technique are, first, it is not dependent on the deterministic or stochastic nature of the systems and, second, the globally optimized models for the original systems can be identified without the need of a differentiable measure function of linearly separable parameters. Under suitable hypotheses, the estimation error is shown to converge in probability to zero. The performance of the proposed algorithm is demonstrated through several simulations.
The study on the development of 6m class sports RIB
Kim, Hyoung-Min ; Suh, Sung-Bu ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 606~613
DOI : 10.5916/jkosme.2007.31.5.606
The 6m class high speed boat is developed with a durable hull and inflatable tube, which is called RIB(Rigid Inflatable Boat), for the purpose of marine leisure. In the stage of the conceptual design, its requirements to be optimized are determined based on the presented information of similar marine leisure RIBs. The 3-D graphical technique using Marine Rhino is utilized to optimize the compartment layout of RIB. The stability analysis is performed for the light and full load conditions with and without the inflatable tube. In addition, the sea keeping and hydrodynamic performance was tested using the proto-type ship in the sea condition. From the results of the computation and the sea trial test, it shows that the performance of the marine leisure RIB satisfies the speed, the convenience, and the stability requirements. This study provides the typical information of the design factors and the procedure to manufacture the marine leisure RIB.
Study on tunnel geometry protecting a propeller using potential based panel method
Suh, Sung-Bu ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 614~621
DOI : 10.5916/jkosme.2007.31.5.614
The fishing boat propulsion system employing the modified stern shape and the tunnel to protect a propeller is developed to increase the cruise speed and reduce he problem resulting from the open propeller accidentally catching the waste net and able on the sea. Using 3 different tunnel types, the model test was performed in the circular water channel and the panel method based on the potential theory is applied to analyze the open water performance of the propeller. In the numerical analysis using he potential-based panel method, it calculates the hydrodynamic interaction between the propeller and the tunnel and evaluates the effect of the tunnel geometry. From the numerical and experimental results differing tunnel geometries, the propulsion efficiency is increased by the larger diameter of the inlet than the outlet of the tunnel and the smaller gap between the propeller tip and the tunnel internal surface. These results provide the information of the propeller system with the tunnel and the hydrodynamic interaction between the propeller and the tunnel.
An Effect of Cold Environment on Human's Physiological Responses and Task Performances
Ku, Hak-Keun ; Kwak, Hyo-Yean ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 5, 2007, Pages 622~629
DOI : 10.5916/jkosme.2007.31.5.622
Some worker is occupationally exposed to cold and freezing environment. The cold stimuli in the working environment impose physiological and psychological loads on workers to decrease the task performance. The purpose of this study is to investigate the cold stimuli of cold and freezing stores widely used in Busan can make an effect on human's physiological responses and task performance, experimentally and analytically. In the experiment, 5 workers are selected as subjects, and then their skin temperatures of hand and ear, heart rates, blood pressure, and ring test performances in cold(
) and freezing(
) stores were measured for 21 minutes and analyzed by using statistical method. It is observed that a physiological variation and the task performance are significantly influenced by an exposure time as well as a strength of cold stimuli. Also, it is suggested the exposure limiting times for the useful manual work and the performance predict model of the ring tasks. The result of this study will be useful for a fundamental data of which design the standard task time of manual tasks and solve the job placement problem of worker selection and placement in cold environment.