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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
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Volume & Issues
Volume 23, Issue 12 - Dec 2006
Volume 23, Issue 11 - Nov 2006
Volume 23, Issue 10 - Oct 2006
Volume 23, Issue 9 - Sep 2006
Volume 23, Issue 8 - Aug 2006
Volume 23, Issue 7 - Jul 2006
Volume 23, Issue 6 - Jun 2006
Volume 23, Issue 5 - May 2006
Volume 23, Issue 4 - Apr 2006
Volume 23, Issue 3 - Mar 2006
Volume 23, Issue 2 - Feb 2006
Volume 23, Issue 1 - Jan 2006
Selecting the target year
Manufacturing Automation of Welding Process Using Vision Sensor
Park, Young-Whan ; Sung, Ki-Eun ; Rhee, Se-Hun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 7~13
Measurement of the Railway Overhead Wire Height and Stagger using Stereo- Vision System
Kim, Sun-Gi ; Kim, Hyun-Chul ; Baek, Yeul-Min ; Park, Jong-Guk ; Sim, Jae-Won ; Jang, Kyoung-Young ; Kim, Whoi-Yul ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 14~21
Correction of Fisheye Distortion and Perspective Distortion
Song, Gwang-Yul ; Yoon, Pal-Joo ; Lee, Joon-Woong ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 22~29
This paper considers the lens distortions such as a fisheye distortion and a perspective distortion. While a fisheye lens has a wide field-of-view, it causes a large distortion to the images. Regardless of a fisheye lens or a rectilinear lens, a lens generates perspective distortion in a vertical direction when the lens views in an upward direction or downward direction. These distortions deform images differently from human visual functions. Therefore, this paper presents a method to correct the distortions, and whereby, the research in this paper enlarges choices of images to image processing algorithm that may select the distorted images and the corrected images depending on applications. An infinite polynomial model is employed in the fisheye radial distortion correction, and the vertical perspective distortion correction is done by using a vanishing point. The methods introduced in this paper are implemented on the images captured by a rear-view camera installed on a vehicle and showed their robustness of the correction.
Measurement of Defects and Stress by Infrared Thermography
Choi, Man-Yong ; Kang, Ki-Soo ; Park, Jung-Hak ; Kim, Won-Tea ; Kim, Koung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 30~35
Quantitative Out-of-plane Deformation Measurement of Pressure Vessel with the Defect Using Shearography
Chang, Ho-Seob ; Lee, Kun-Jung ; Kim, Kyoung-Suk ; Jung, Hyun-Chul ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 36~43
Machinability Comparison of Planetary Milling and Side Milling for Worm Machining
Lee, Min-Hwan ; Kwon, Tae-Woong ; Kang, Dong-Bae ; Kim, Hwa-Young ; Ahn, Jung-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 44~51
According to global trend of the expanding need of high-quality automobiles, the usage of small precise worm consisting of gearing part for motors to actuate convenience modules has increased rapidly. Precision of those worms has very sensitive characteristic to motor performance and noise. Forming process has been generally used to manufacture worms because of its mass productivity. However, it has problems such as deformation due to residual stress and wear of dies. Planetary milling and side milling are among alternatives using cutting tools. To overcome those problems the two machining methods have some contrast features in the sense of tool numbers and cutting mechanism. In this paper, machinability of both methods was compared in terms of cutting force, precision and cycle time.
Micro Machining by EDM and ECM
Jeon, Dong-Hun ; Kim, Bo-Hyun ; Chu, Chong-Nam ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 52~59
Micro electrical discharge machining (EDM) and micro electrochemical machining (ECM) were studied for the fabrication of micro structures. Micro EDM has been used to machine micro structures from metals. However, since the tool wear is inevitable during the machining, the tool wear is drawback for the precision machining. Micro ECM is also used for micro machining and produces better surface quality than that of micro EDM. Moreover, since tool electrodes are not worn out, micro ECM is suitable for the precision micro machining. However, the machining rate is lower than that of micro EDM. In this paper, therefore, the hybrid machining process which uses micro EDM as roughing and micro ECM as finishing is introduced. By using this hybrid machining, a hemisphere with
radius was fabricated and the efficiency of the process was investigated experimentally.
Temperature Control of Aluminum Plate by PWM Current Control of Peltier Module
Pang, Du-Yeol ; Kwon, Tae-Kyu ; Lee, Seong-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 60~67
This paper presents the temperature control in aluminum plate with Peltier module. From the experimental work, Peltier module is used to control the temperature of small aluminum plate for both heating and cooling with the control of current and fan ON/OFF. And current control of Peltier module was accomplished by PWM method. As a result of experiments, it is proper that operate cooling fan only while cooling duration and there exist a proper cooling current to drop temperature rapidly. It takes about 125sec to control temperature of aluminium plate between
and about 70sec between
, in ambient temperature
while cooling fan is operated only cooling duration. With the cooling current, temperature control of aluminum plate was accomplished more rapidly in comparison without cooling current. Future aim is to realize more rapid temperature control and develop SMHA(special metal hydride actuator) by using Peltier module as a heating and cooling source.
A Study on the Prepreg Treatment to Improve Interlaminar Fracture Behavior of Graphite/Epoxy Composites
Kim, Min-Ho ; Rhee, Kyong-Yop ; Paik, Young-Nam ; Kim, Hyeon-Ju ; Jung, Dong-Ho ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 68~73
In this study, the graphite/epoxy prepregs were surface-treated using oxygen plasma, and optimal treatment time was determined measuring the contact angle on the prepreg surface. Interlaminar fracture behavior of surface-treated graphite/epoxy composites was compared with that of regular (untreated) graphite/epoxy composites. The results showed that the contact angle was a minimum when treated for 30 minutes. The interlaminar fracture toughness of surface-treated specimen was improved about 15% compared with that of regular specimen.
A Study on the Wear Behavior of SPS5 Steel Surface-Treated by Induction Hardening Method
Kim, Min-Ho ; Rhee, Kyong-Yop ; Paik, Young-Nam ; Hong, Jai-Sung ; Ham, Young-Sam ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 74~79
In this study, the tempering effect on the wear characteristics of induction-hardened SPS5 steel was investigated. For this purpose, three tempering conditions were applied to control the hardness of heat-treated SPS5 steel. Ball-on-disk wear tests have been performed using zircornia balls on the tempered specimens to determine the variation of wear characteristics. The results showed that friction coefficient decreased with increasing hardness for induction hardening conditions. This seems to occur because real contact area between specimen and mating ball was affected by the specimen hardness.
Low Velocity Impact Behavior of Metallic Sandwich Plate with a Truss Core
Jung, Chang-Gyun ; Seong, Dae-Yong ; Yang, Dong-Yol ; Kim, Jin-Suck ; Ahn, Dong-Gyu ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 80~87
Metallic sandwich plate with a truss core has metallic inner structures which have low relative density between a pair of metal skin sheets or face sheets. In this work, low impact tests have been carried out to examine the behavior of sandwich plates with a pyramidal truss core. For the low velocity impact, the impact apparatus of drop weight type has been fabricated. From the results of the experiments, maximum energy absorption is found to happen when the upper sheet fails. The sandwich plate loses its absorption ability as soon as the inner structures have been crashed completely and optimal core thickness has existed to maximize energy absorption. Comparing the metallic sandwich plate with the monocoque plate, the absorbed energy has been improved up to 160 % and the deflection decreased by up to 76%. As a result, the metallic sandwich plate with a truss core is shown to have good material for impact resistance and energy absorption.
Material Properties of Thick Aluminum Coating Made by Cold Gas Dynamic Spray Deposition
Lee, Jae-Chul ; Ahn, Sung-Hoon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 88~95
Cold gas dynamic spray is a relatively new coating process by which coatings can be produced without significant heating during the process. Cold-spray uses supersonic gas flow to carry metallic powders to the substrate. Its low process temperature can minimize thermal stress and also reduce the deformation of the substrate. Most researches on cold-spray have focused on micro scale coating, but in this study macro scale deposition was conducted. Properties of aluminum layer by cold-spray deposition such as coefficient of thermal expansion (CTE), modulus of elasticity. hardness, and electric conductivity were measured. The results showed that properties of aluminum layer by cold-spray deposition were different from properties of pure aluminum and aluminum alloy.
Static and Structural Analyses of the Link of a Double-Action Link-Type Hydraulic Die Set
Eom, Jae-Gun ; Jun, Byoung-Yoon ; Joun, Man-Soo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 96~102
This paper presents the mechanics of the link of a double-action link-type hydraulic die set for the enclosed die forging. Operational principle of the die set in the enclosed die forging is introduced with emphasis on force transmission from the press and the hydraulic system to the material through links, die components and punches. The force exerted on the link is statically investigated and its structural analysis is carried out. The analyzed results are discussed to be used for design of the link system.
Performance Analysis of a Vacuum-Compatible Air Bearing
Khim, Gyung-Ho ; Park, Chun-Hong ; Lee, Hu-Sang ; Kim, Seung-Woo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 103~112
This paper describes a theoretical analysis and experimental verification on the performances of a vacuum-compatible air bearing, which is designed with a cascaded exhaust scheme to minimize the air leakage in a vacuum environment. The design of the vacuum-compatible air bearing equipped with the differential exhaust system requires great care because several design parameters, such as the number of exhaust stages, diameter of exhaust tube, pumping speed of a vacuum pump, and bearing clearance greatly influence the air leakage and thus degree of vacuum. In this study, a performance analysis method was proposed to estimate the performances of the air bearing, such as load capacity, stiffness, and air leakage. Results indicate that the load capacity and stiffness of the air bearing was improved as its boundary pressure, which was determined by the
exhaust method, was lowered, and the dominant factors on the chamber's degree of vacuum were the number of exhaust stages, exhaust tube diameter and bearing clearance. A vacuum chamber and air bearing stage using porous pad were fabricated to verify the theoretical analysis. The results demonstrate that chamber pressure up to an order of
Pa was achieved with the air bearing stage operating inside the chamber, and this analysis method was valid by comparing predicted values with experimental data, for the mass flow rates from the porous pad, and pressures at each exhaust port and chamber, respectively.
A Study on Structural Design and Evaluation of the High Precision Cam Profile CNC Grinding Machine
Lim, Sang-Heon ; Shin, Sang-Hun ; Lee, Choon-Man ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 113~120
A cam profile CNC grinding machine is developed for manufacture of high precision contoured cams. The developed machine is composed of the high precision spindle using boll bearings, the high stiffness box layer type bed and the three axis CNC controller with the high resolution AC servo motor. In this paper, structural and modal analysis for the developed machine is carried out to check the design criteria of the machine. The analysis is carried out by FEM simulation using the commercial software, CATIA V5. The machine is modeled by placing proper shell and solid finite elements. And also, this paper presents the measurement system and experimental investigation on the modal analysis of a grinding machine. The weak part of the machine is found by the experimental evaluation. The results provide structure modification data for good dynamic behaviors. And safety of the machine was confirmed by the modal analysis of modified machine design. Finally, the cam profile grinding machine was successfully developed.
Finite Element Analysis of Stent Expansion Considering Stent, Artery and Plaque Interaction
Kim, Sung-Min ; Park, Sung-Yun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 10, 2006, Pages 121~125
In this paper, results are presented by nonlinear finite element simulations in order to analy the interactions between the stent and artery or plaque. Maximum of von Mises stress was calculated in the contacting areas between the stent and the artery. The simulated results show that the distal end of stent, which tilts after expansion, may injure the artery wall. In conclusion, this study may help designing new stents.