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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea Society For Power System Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Power System Engineering
Editor in Chief :
Volume & Issues
Volume 17, Issue 6 - Dec 2013
Volume 17, Issue 5 - Oct 2013
Volume 17, Issue 4 - Aug 2013
Volume 17, Issue 3 - Jun 2013
Volume 17, Issue 2 - Apr 2013
Volume 17, Issue 1 - Feb 2013
Selecting the target year
Research and Development of Sea Water Heat Pump
Kwon, Oh-Kyung ; Seol, Won-Sil ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 7~13
DOI : 10.9726/kspse.2013.17.1.007
Smart Type Operation Control of Tandem Heat Pump System
Son, Ji-Hoon ; Lee, Ho-Saeng ; Kim, Hyeon-Ju ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 14~18
DOI : 10.9726/kspse.2013.17.1.014
Volume Optimization of a Combined System of LNT and SCR Catalysts Considering Economic Feasibility and De-NOx Performance
Seo, Choong-Kil ; Choi, Byung-Chul ; Kim, Young-Kwon ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 19~26
DOI : 10.9726/kspse.2013.17.1.019
The purpose of the study is carried out volume optimization of a combined system consisting of an LNT and SCR catalysts from the standpoint of its economic feasibility and de-NOx performance. Under the rich air-fuel ratio conditions for 5s (
Impact of Ash Deposit on Conversion Efficiency of Wall Flow Type Monolithic SCR Reactor
Park, Soo-Youl ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 27~35
DOI : 10.9726/kspse.2013.17.1.027
SCR (Selective Catalytic Reduction) on DPF (Diesel Particulate Filter) is a multi-functional after-treatment device which integrates soot filtration and DeNOx function into a single can. Because of its advantage in package and cost, the SCR on DPF is considered as a potential candidate for future application. It inherently employes wall flow type monolithic reactor so ash included in exhaust gas may deposit inside the inlet channel of this device. This study is intended to identify the impact of ash deposit on SCR reaction under wall flow type monolithic reactor. Simulation approach is used so relevant species transport equations for wall flow type monolith is derived. These equations can be solved together with momentum conservation equations and give solution for conversion performance. Both ash deposit and clean catalyst case are simulated and comparison of these two cases gives an insight for the impact of ash deposit on conversion performance. Ash deposit can be classified as ash layer and ash plug. and impact of ash deposit is described along with different morphology of ash deposit.
Analysis on the Likelihood of Axisymmetric Wave Propagation in Buried Water Pipes
Park, Kyung-Jo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 36~41
DOI : 10.9726/kspse.2013.17.1.036
A study of the possible axisymmetric modes that propagate at low frequencies in buried, water-filled pipes is presented. It is well known that for a vacuum-pipe-vacuum system the sole non-torsional axisymmetric mode that exists at low frequencies is the fundamental L(0,1) mode. When a pipe is filled with water and still surrounded by a vacuum it is also known that another mode then appears which at low frequencies is characterized by predominantly axial water-borne displacements. In addition to these modes. this paper explores two other, less well known axisymmetric modes whose exitence depends on the acoustic properties of the outer medium that surrounds a pipe. The predicted characteristics of these modes are presented and the likelihood of them propagating over any significant distance in a buried water pipe is discussed.
Development of Vibroacoustic Stimulation Seat for a Movie Theater Chair
Moon, Deok-Hong ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 42~49
DOI : 10.9726/kspse.2013.17.1.042
The global movie industry is continuing rapid growth through application of the latest technology. 3D movies are being produced and shown for a more effective viewing experience. Special chairs for audiences are being experimentally manufactured and installed for the greatest viewing effect. This special chair has a structure that applies vibrating stimuli to specific parts of the body by attaching vibration transducers to theater chairs and synchronizing it with each scene of the movie. In a previous study, it has been confirmed that we can analyze the vibration transfer characteristics of sponge seats through the application of an experimental modal analysis method and obtain design variables easily. In this paper, we examine the major design parameters needed in the development of a foaming sponge seat in which auxiliary springs are inserted to improve the vibration transfer effect of a chair seat. Through analyzing several prototypes by applying experimentation as well as the experimental modal analysis method, it was confirmed that the effect of vibration transfer can be improved through the use of an auxiliary member.
Development of Vibration Analysis Algorithm for Joined Conical-cylindrical Shell Structures using Transfer of Influence Coefficient
Yeo, Dong-Jun ; Choi, Myung-Soo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 50~57
DOI : 10.9726/kspse.2013.17.1.050
This describes the formulation for the free vibration of joined conical-cylindrical shells with uniform thickness using the transfer of influence coefficient. This method was developed based on successive transmission of dynamic influence coefficients, which were defined as the relationships between the displacement and the force vectors at arbitrary nodal circles of the system. The two edges of the shell having arbitrary boundary conditions are supported by several elastic springs with meridional/axial, circumferential, radial and rotational stiffness, respectively. The governing equations of vibration of a conical shell, including a cylindrical shell, are written as a coupled set of first order differential equations by using the transfer matrix of the shell. Once the transfer matrix of a single component has been determined, the entire structure matrix is obtained by the product of each component matrix and the joining matrix. The natural frequencies and the modes of vibration were calculated numerically for joined conical-cylindrical shells. The validity of the present method is demonstrated through simple numerical examples, and through comparison with the results of previous researchers.
Experimental Study on the Aerodynamic Performance of Double Inlet Sirocco Fan for a Package Air Conditioner
Kim, Jang-Kweon ; Oh, Seok-Hyung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 58~63
DOI : 10.9726/kspse.2013.17.1.058
The aerodynamic performance of double inlet sirocco fan is strongly dependent upon the design factors of impeller and scroll. In this paper, the change of scroll size was adopted to investigate the aerodynamic performances of double inlet sirocco fan and indoor PAC. Especially, a scroll expansion angle and a cut-off clearance ratio were considered to change the scroll size. In addition, the installation depth between double inlet sirocco fan and indoor PAC was considered. As a result, the total pressure efficiency of double inlet sirocco fan shows about 62%~73% according to the change of scroll expansion angles. Moreover, the flowrate performance of indoor PAC is the best at the condition of a scroll expansion angle of 8°, an installation depth of 15 mm and a cut-off clearance ratio of 8%.
Effect of Divergence Ratio on Heat Transfer and Friction Factor in the Diverging Channel
Oh, Se-Kyung ; Lee, Myung-Sung ; Jeong, Seong-Soo ; Ahn, Soo-Whan ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 64~70
DOI : 10.9726/kspse.2013.17.1.064
The heat transfer and friction factor characteristics of turbulent flows in three stationary channels have been investigated experimentally to check out the effect of divergence ratio. These are a constant cross-sectional channel and two diverging channels with ratio of divergence(Dho/Dhi) of 1.16 and 1.49. The measurement was conducted within the range of Reynolds numbers from 15,000 to 89,000 and the dimension of uniform cross-sectional test section is
at the cross section and 1,000 mm in length. The measurements of heat transfer coefficients and friction factors in the uniform channels were conducted as a reference. Because of the streamwise flow deceleration, the heat transfer and friction factor characteristics in the diverging channel were quite different from those of the constant cross-sectional channel. The effective friction factors and convective heat transfer coefficients increased with increasing the ratio of divergence of the channel.
Study on the Adsorption and Desorption Enhance Effect of Oyster Shell Using Peltier Element
Kim, Myoung-Jun ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 71~76
DOI : 10.9726/kspse.2013.17.1.071
This study is experimentally performed for using the oyster shell as a desiccant in the batch type system. The peltier element(thermoelectric device) is used for absorbing and releasing the adsorption and desorption heat generation. The cooling and heating effects of peltier element exist in this experiment and these effects are generally known phenomena among some references. The increase in electric current induced into peltier element is effectively release the heat generation of adsorption and desorption. Consequently, the non-dimensional adsorption and desorption amount would increase with increase in electric current. However, in the case of adsorption, the increase of induced current into peltier element, the heat of cold side can not release sufficiently. So the heat of hot side of peltier is transferred into the cold side.
Study on Robust Control for Proportional Pressure Control Valve with MRC
Yun, So-Nam ; Jeong, Hwang-Hun ; Lee, Ill-Young ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 77~84
DOI : 10.9726/kspse.2013.17.1.077
The proportional pressure control valve that was used to relief valve has different dynamic characteristics on each case. Because this valve has different assembling or processing error and environmental condition. However, a customer who used the relief valve wants to have a steadily performance even if the dynamic characteristics of valve was changed. For this reason, the manufacturer try to make the robust controller that has simple structure. This paper concerns about the design of robust controller that didn`t affected by plant parameter`s changing. The control strategy is a model reference control that conducted by on line identification problem, gradient method and Lyapunov equation. This adaptvie control law`s validity that this paper deal with was confirmed by an results of step response test or hysteresis test.
A Study on the Dry CVT with Movable Flange of Ball Type
Kwon, Young-Woong ; Choi, Sang-Soo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 85~90
DOI : 10.9726/kspse.2013.17.1.085
Dry CVT consists of a driving pulley and a driven pulley joined by rubber V-belt. Each pulley consists of a fixed flange and a movable flange. The movable flange moves toward a fixed flange under the actuation of a centrifugal roller, as the driving pulley speed increases. The important claim which have an influence on the performance of the Dry CVT is the wear of the centrifugal roller. In this study ball type is proposed instead of roller type of movable flange to resolve the claim. Simulation is carried out for new model to verificate performance, experiments are carried out for new model to evaluate performances.
Study on the Grinding Characteristic of MWCNT and Al
Composite by Using Planetary Ball Mill
Seo, Chang-Myung ; Kim, Yeong-Geun ; Ji, Myoung-Kuk ; Jeong, Hyo-Min ; Chung, Han-Shik ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 91~96
DOI : 10.9726/kspse.2013.17.1.091
The present paper focuses on the fabrication of materials with higher thermal conductivity. Nanofluid is a novel transfer prepared by dispersing nanometer-sized solid particles in traditional heat transfer fluid to increase thermal conductivity and heat transfer performance. The purpose of this study is making the nano-size particle. The experiment of MWCNT and
was carried out using a planetary ball mill at several rotation speeds: 200 ~ 400 rpm. The results were examined using scanning electron microscope(SEM). In the case of the MWCNT, it could be more grinding into the small particle in the dry condition and it confirm in the case of the
to be more grinding into the small particle contrary to the MWCNT in the wet condition. In the mixture grinding result of MWCNT and
, the dry condition showed the good result in low rotation speed than the wet condition.
Structural Analysis of 800Ton Hot Stamping Press
Choi, Byeong-Keun ; Lee, Jeong-Hoon ; Lee, Jong-Myeong ; Ha, Jeong-Min ; Gu, Dong-Sik ; Kim, Won-Chul ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 97~103
DOI : 10.9726/kspse.2013.17.1.097
Press machine has advantages over other manufacturing machine which can produce large quantities of products in short time so it is widely used in lots of industrial sectors. To obtain the vehicle`s weight lightening and rigidity of the body-frame by applying `Hot stamping` technique is increasing in the automotive field. In this paper, to improve the irregular vibration arose by 800Ton hot stamping press, the research was continued. Bed, slide and main frame are the key part of working precision, so perform structural analysis was conducted, and based on the analyzing results, structural changes were done on the parts where structural deformation occurred.
The Research on the Nanoparticles Prepared by Arc-Discharge Method as Anode Materials for Lithium Ion Batteries
Kim, Hyeong-Jo ; Tulugan, Kelimu ; Kim, Hyung-Jin ; Park, Won-Jo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 104~109
DOI : 10.9726/kspse.2013.17.1.104
Tin and Tinoxide nanoparticles were prepared by arc-discharge nanopowder process. The negative electrode were fabricated using Tin and Tinoxide nanopower. The microstructure and electrochemistry properties were investigated and compared between Tin and Tinoxide. The oxidation film has microstructure of core/shell type and the shell which was attached around Tin nanoparticle consisted of amorphous
. The shape of Tinoxide nanoparticles was formed with irregular shape in comparison with Tin particle. Initial discharge capcity of Tinoxide electrode possesed about 1000mAh/g, which is about 320mAh/g higher than Tin electrode. Irreversible capacity of Tin electrode is much higher than Tinoxide. The cycle performance of Tinoxide electrode was indicated that is batter than Tin. The Tin negative electrode lost most of capacity after 4 cycle but Tinoxide electrode still retained the capacity. The Tinoxide does show some promise as Li-ion battery anode due to their large reversible capacity at low potentials.
The Research on Aluminum and Silcon Nanoparticles as Anode Materials for Lithium Ion Batteries
Kim, Hyeong-Jo ; Tulugan, Kelimu ; Kim, Hyung-Jin ; Park, Won-Jo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 1, 2013, Pages 110~115
DOI : 10.9726/kspse.2013.17.1.110
The electrochemical performance and microstructure of Al-Si, Al-Si/C was investigated as anode for lithium ion battery. The Al-Si nano composite with 5 : 1 at% ratio was prepared by arc-discharge nano powder process. However, some of problem is occurred, when Al nano composite was synthesized by this manufacturing. The oxidation film is generated around Al-Si particles for passivating processing in the manufacture. The oxidation film interrupts electrical chemistry reaction during lithium ion insertion/extraction for charge and discharge. Because of the existence the oxidation film, Al-Si first cycle capacity is very lower than other examples. Therefore, carbon synthsized by glucose (
) was conducted to remove the oxidation film covered on the composite. The results showed that the first discharge cycle capacity of Al-Si/C is improved to 113mAh/g comparing with Al-Si (18.6mAh/g). Furthermore, XRD data and TEM images indicate that
crystalline exist in Al-Si/C composite. In addition the Si-Al anode material, in which silicon is more contained was tested by same method as above, it was investigated to check the anode capacity and morphology properties in accordance with changing content of silicon, Si-Al anode has much higher initial discharge capacity(about 500mAh/g) than anode materials based on Aluminum as well as the morphology properties is also very different with the anode based Aluminum.