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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
Editor in Chief :
Volume & Issues
Volume 25, Issue 12 - Dec 2008
Volume 25, Issue 11 - Nov 2008
Volume 25, Issue 10 - Oct 2008
Volume 25, Issue 9 - Sep 2008
Volume 25, Issue 8 - Aug 2008
Volume 25, Issue 7 - Jul 2008
Volume 25, Issue 6 - Jun 2008
Volume 25, Issue 5 - May 2008
Volume 25, Issue 4 - Apr 2008
Volume 25, Issue 3 - Mar 2008
Volume 25, Issue 2 - Feb 2008
Volume 25, Issue 1 - Jan 2008
Selecting the target year
Nano-Bio Sensor Technology and Characteristics
Yun, Yeo-Heung ; Hur, Shin ; Lee, Seong-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 7~14
Carbon Nanotube Biosensor Technology using Electro-analytical Method
Yun, Yeo-Heung ; Schulz, Mark J. ; Shanov, Vesselin ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 15~21
Nano-Bio Sensor Technology using Micro Cantilever
Hur, Shin ; Yun, Yeo-Heung ; Lee, Seong-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 22~29
Development of Biosensor using by Surface Acoustic Wave
Hong, Chul-Un ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 30~36
Gene Diagnostic Mechanism and Technology
Koo, Young-Mi ; Park, Han-Ee ; Park, Han-Oh ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 37~44
Machining of Micro Structure using Elliptical Vibration Grooving Machine
Kim, Gi-Dae ; Loh, Byoung-Gook ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 45~51
Successive micro-scale V-grooves and a grid of pyramids were machined by elliptical vibration tufting (EVC) to investigate feasibility of using EVC as an alternative method of creating micro-molds to photo-lithography and electroforming, which have been commonly employed. An elliptical vibration grooving machine was developed which consists of two orthogonally-arranged piezoelectric actuators, a diamond cutting tool, and a motorized xyz stage. The micro-scale features were machined on materials of copper, duralumin, nickel, and hastelloy and it was found that EVC significantly reduces cutting resistance and prohibits generation of side burrs and rollover burrs, thus resulting in improving machining qualify of micro-molds in ail experimented workpiece materials.
Measurement of metal materials structure by using the manufactured Scanning Confocal Microscopy
Seo, Myeong-Hee ; Kim, Jong-Bae ; Kwon, Nam-Ic ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 52~57
We demonstrate the operation of an apparatus that we call the laser scanning confocal microscopy. It is valuable tool of the investigations for imaging process. We measured the thin metal structure through the SCM manufacture. Confocal microscopy offers several advantages including shallow depth of field, elimination of out-of-focus glare, and the ability to collect serial optical sections from thick specimens than conventional optical microscope. This research is manufactured of scanning confocal microscopy and after measured of metal materials structure.
Design and Control of Industrial Dual Arm Robot
Park, Chan-Hun ; Park, Kyoung-Taik ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 58~65
The study on dual arm robot manipulator which consists of two 6-DOF srms and one 2-DOF torso is introduced. This dual arm robot manipulator is designed for automation of assembly process in automotive manufacturing line. Each industrial 6-DOF arm can be used as a stand-alone type of industrial robot manipulator with 6-DOF and as a manipulator part of dual arm robot at the same lime. These structures help the robot maker willing to succeed in emerging market of dual arm robots have the high competitive power for the current industrial robot market and the emerging market of dual arm robot at the same time. The research results of the design concept, workspace analysis and the PC-based controller will be introduced.
Design of Rolling Pass Schedule in Copper Thin Foil Cold Rolling According to Roll Crown of 6 High Mill
Lee, Sang-Ho ; Ok, Soon-Young ; Hwang, In-Youb ; Hwang, Won-Jea ; Kim, Byung-Min ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 66~72
During the plate and foil cold rolling process, considerable values of the force of material pressure on the tool occur. These pressures cause the elastic deformation of the roll, thus changing the shape of the deformation legion. Rolled copper foils should be characterized by a good quality and light dimensional tolerances. Because of automation that is commonly implemented in flat product rolling mills, these products should meet the requirements of tightened tolerances, particularly strip thickness, and feature the greatest possible flatness. The shape of the roll gap is influenced by the elastic deformation of rolls parts of the rolling process affecter of the pressure force. However, to control roll deformation should be difficult. Because the foil thickness is very thin and the permissible deviations in the thickness of foil are small. In this paper, FE-simulation of roll deformation in thin foil cold roiling process is presented.
Development of Reducer for Generating Facility of Electric Power for Low Noise/vibration
Lee, Hyoung-Woo ; Park, Chul-Woo ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 73~82
A dynamic model of reducer for generating facility of electric pourer having bevel gear pair and planetary gear train is developed by lumped method. The model accounts for the shaft and bearing flexibilities, gyroscopic effects and the force couplings among the transverse and torsion motions due to gearing. Vibration/noise analysis as well as strength of bevel gear pair and planetary gear train are considered. Exciting forces of high reducer for generating facility of electric power areconsidered as the mass unbalance of the rotors, misalignment and a function of gear transmission error. A Campbell diagram, in which the excitation sources caused by the mass unbalance of the rotors, misalignment and the transmitted errors of the gearing are considered, shows that, at the operating speed, there are not critical speed.
Characterization of SCR System for NOx Reduction of Diesel Engine (II)
Lee, Joon-Seong ; Kim, Nam-Yong ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 83~89
The Effect of Space Velocity(SV) on NOx conversion rate was performed to develop NOx reduction after-treatment system. SV is calculated from engine exhaust gas volume and SCR catalyst volume. Found the Urea injection duty of maximum efficiency for NOx conversion if increase SV, NOx Conversion rate is down. Especially, when SV is more than
, NOx conversion rate decrease suddenly. Same case, if SV is lower than
, NOx conversion rate is down. Also, the characterization of Urea-SCR system was performed. Three candidate injectors for injecting Urea were tested in terms of 속 injection rate and NOx reduction rate. The performances of SCR catalytic converter on temperature were investigated. The performance of Urea-SCR system was estimated in the NEDC test cycle with and without EGR. It was found that nozzle type injector had high NOx conversion rate. SCR catalytic converter had the highest efficiency at the temperature of
. EGR+Urea-SCR system achieved NOx reduction efficiency of 73% through the NEDC test cycle.
Effect of Printing Qualities on the Resonant Frequencies of Printed UHF RFID Tag Antennas
Kim, Chung-Hwan ; Lee, Yong-Shik ; Kim, Young-Guk ; Kim, Dong-Soo ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 90~94
Recently, a great deal of research is focused on the printed electronics. One of their mainly concerned products is printed RFID tag. RFID technology has attracted researchers and enterprises as a promising method for automatic identification, and they are expected to replace conventional bar codes in inventory tracking and management. The key to successful RFID technology lies in developing low-cost RFID tags and the first step in applying printing technology to RFID systems is to replace antennas that are conventionally produced by etching copper or aluminum. However, due to the printing quality variations, errors, and lower conductivity, the performance of the printed RFID antennas is lower than that of antennas manufactured by conventional etching methods. In this paper, the effect of variations in the printing conditions on the antenna performance is investigated. Three levels for each condition parameter is assumed and effect on the resonant frequency are examined experimentally based on orthogonal array. The most serious factor that affects the resonant frequency of the antenna is the non-uniformity of the edge and the resonant frequency is found to be lower as the non-uniformity increases.
The Characteristics of Flexure Strength and Rigidity in Light-weight CFRP Members
Yang, In-Young ; Kim, Jung-Ho ; Kim, Ji-Hoon ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 95~99
Applications of composite materials in various engineering fields have been extended significantly. For being useful composite materials, we could modify the rigidity and strength characteristics of composite material according to structures and material direction. In this study, CFRP, which has been widely used in space leisure and general structural applications due to the weight, elasticity coefficient, high fatigue strength and lower thermal transformation ect, was selected. As the CFRP is an anisotropic material whose mechanical properties change with its stacking sequence or angle, special attention was given to the effects of the fiber orientation angle on the bending characteristics of CFRP fiat and CFEP square members. It's different on the each result of strength and rigidity of CFRP flat and CFRP square members.
Dimensional Stability of an Imprinted Microoptic Waveguide
Ryu, Jin-Hwa ; Kim, Chang-Seok ; Jeong, Myung-Yung ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 100~106
We have studied the characteristic changes of optical device using imprint lithography. An imprinted structure is inherently involved in residual stress due to the temperature and the pressure cycle during fabrication process. A structure with residual stress undergoes stress relaxation, which leads io dimensional change. Therefore, annealing processes was performed to reduce the residual stress of imprinted polymer channel. Reduction of residual stress was confirmed through dimensional change, birefringence, and the mechanical properties. We have fabricated an optical device, and it saw the optical intensity changes within 0.1% for 1 month.
Biomechanical Analysis of Lower Limb Joint Motions and Lumbar Lordosis during Squat and Stoop Lifting
Hwang, Seon-Hong ; Kim, Young-Eun ; Kim, Young-Ho ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 107~118
In this study, lower extremity joint kinematics and kinetics and lumbar lordosis were investigated for two different symmetrical lifting techniques(squat and stoop) using the three-dimensional motion analysis. Twenty-six male volunteers lifted boxes weighing 5, 10 and 15kg by both squat and stoop lifting techniques. There were not significant differences in maximum lumbar joint moments between the two techniques. The hip and ankle contributed the most part of the support moments during squat lifting, and the knee flexion moment played an important role in stoop lifting. The hip, ankle and lumbar joints generated power and only the khee joint absorbed power in the squat lifting. The knee and ankle joints absorbed power, the hip and lumbar joints generated power in the stoop lifting. The bi-articular antagonist muscles' co-contraction around the knee joint during the squat lifting and the eccentric co-contraction of the gastrocnemius and semitendinosus were found to be important for straightening up during the stoop lifting. At the time of lordotic curvature appearance in the squat lifting, there were significant correlations in all three lower extremity joint moments with the lumbar joint. Differently, only the hip moment had significant correlation with the lumbar joint in the stoop lifting. In conclusion, the knee extension which is prominent kinematics during the squat tilling was produced by the contributions of the kinetic factors from the hip and ankle joints(extensor moment and power generation) and the lumbar extension which is prominent kinematics during the stoop lifting could be produced by the contributions of the knee joint kinetic factors(flexor moment, power absorption, bi-articular muscle function).
The Role of Synovial Fluid in the Micro-scale Frictional Response of Bovine Articular Cartilage from Atomic Force Microscopy
Park, Seong-Hun ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 119~125
The objective of this study was to compare micro-scale friction coefficients with and without synovial fluid, and micro-scale measurements were performed using atomic force microscopy (AFM) with a
spherical probe. Four cylindrical cartilage specimens were harvested from two fresh bovine humeral heads (4-6 months old).
deviation values of the micro-scale AFM frictional coefficients calculated from the liner fit of friction versus normal force was
with and without synovial fluid coating on AFM probe respectively, showing its reduction by
with synovial fluid. To the best of our knowledge, this experimental study investigates the first such comparisons of frictional response of articular cartilage with and without synovial fluid coating on AFM probe, and provides significant insights into the role of synovial fluid in the articular cartilage friction and lubrication independently of the confounding effect of fluid pressurization in the articular cartilage.
Investigation into Directional Properties of Rapid Prototypes and Its Application to FE Analysis Considering Anisotropy
Park, Keun ; Kim, Young-Soo ; Park, Do-Yoon ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 11, 2008, Pages 126~133
Rapid Prototyping (RP) has been widely used for rapid development of prototypes in various industrial fields. In recent years, a new requirement in RP industry has issued so as to directly manufacture a functional prototype which has enough mechanical properties to be used as a functional part. The RP prototype, however, has a limitation in mechanical properties due to its layer-by-layer manufacturing process. This manufacturing process results in anisotropy of the prototype, especially showing weakness in the building direction. In the present work, we performed tensile tests for RP prototypes in order to determine directional mechanical properties. The test specimens were made by using
by Object Geometries Ltd. Finite element analyses considering material anisotropy were then carried out for RP prototypes with various building directions. Effect of the building direction on the mechanical strength was investigated through the analysis, and compared with experimental results.