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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 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
Performance Improvement of a Linear Motors by Structural Optimization [
Hwang, Young-Kug ; Lee, Choon-Man ; Eun, In-Ung ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 7~14
A Study on the 50,000RPM-5.6KW Sensorless BLDC Motor Driver
Yoon, Seong-Sik ; Kim, Sung-Hoon ; Park, Seung-Kyu ; Ahn, Ho-Kyun ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 15~21
Development of the High Speed Dynamometer using the Generator
Kim, Chang-Soon ; Chung, Won-Jee ; Yoon, Sang-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 22~27
Development of Manufacturing Process for a Curvic Coupling of Machine Tools and Inspection Device
Park, Dong-Keun ; Lee, Choon-Man ; Kim, Jae-Woong ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 28~33
A Study on Roll Forming for Precision Improvement of High Rotation Gear
Jang, Jeong-Hwan ; Uematsu, Seizo ; Cho, Seong-Hyun ; Kim, Jun-Seong ; Lyu, Sung-Ki ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 34~42
A Study on Implementation of Al-Inserted Plastic Injection Molding Process for Automobile Interior-Parts
Lho, Tae-Jung ; Kim, Kyung-Soo ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 43~51
Generally a plastic injection molding is a manufacturing process used to produce the various parts of complicated shape at low cost. The objective of this study is to implement a new plastic injection molding process with inserted Aluminum sheet, which is highly durable, light and luminous. Moldflow analysis and simulation of plastic injection molding process with inserted Aluminum sheet were carried out in order to predict optimal molding operation conditions. The experimental results in the Al-inserted plastic injection molding process were compared with the simulation results by Moldflow. Durability and reliability test results for trial products were satisfied to adopt the Al-inserted plastic injection molding process developed as manufacturing of automobile interior parts.
Prediction System of Thermal Errors Implemented on Machine Tools with Open Architecture Controller
Kim, Sun-Ho ; Ko, Tae-Jo ; Ahn, Jung-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 52~59
The accuracy of the machine tools is degraded because of thermal error of structure due to thermal variation. To improve the accuracy of a machine tools, measurement and prediction of thermal error is very important. The main part of thermal source is spindle due to high speed with friction. The thermal error of spindle is very important because it is over 10% in total thermals errors. In this paper, the suitable thermal error prediction technology for machine tools with open architecture controller is developed and implemented to machine tools. Two thermal error prediction technologies, neural network and multi-linear regression, are investigated in several methods. The multi-linear regression method is more effective for implementation to CNC. The developed thermal error prediction technology is implemented on the internal function of CNC.
NC Milling Productivity Incensement by Short Milling Tool Setting Method
Kim, Su-Jin ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 60~68
The tool overhang length affects tool deflection and chatter that should be reduced for machined surface quality, productivity and long tool lift. The shortest tool setting algorithm that uses a safe space is proposed and applied with simulation software in NC machining. The safe space in the coordinate fixed in the tool is computed by the virtual machining system that simulates NC machining by stock model, tool model and NC code. The optimal tool assembly that has largest diameter and shortest length is possible using the safe space. This algorithm has been applied over fifty companies for safe and rigid tool setting. The collision accident between holder and stock was reduced from 3 to 0 a year and the productivity was incensed about 15% by using faster feed rate acceptable for shorten tool length.
Geometric Error Analysis of Contact Type Three Points Supporting Method for Inner Diameter Measurement
Kim, Min-Ho ; Kim, Tae-Young ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 69~76
Inner diameter of bearing race is automatically measured by complete inspection system after grinding process. Contact type three points supporting method is widely applied to automatic inner diameter measurement because of its excellent stability. However, the geometric consideration regarding three points supporting method is not sufficient. In this study, the error equation from geometric error analysis of three points supporting method is found. The effect of factors in the error equation is also investigated. The error equation is linear for difference of diameter in sample and master on range of tolerance. An error becomes more and more larger, when the distance of two supporting balls or the diameter of supporting ball are increased. In the result, some considerations are proposed for measurement of inner diameter by the three points supporting method.
Estimation of Dynamic Stress Concentration Factor by Infrared Thermography Stress Analysis
Choi, Man-Yong ; Kang, Ki-Soo ; Park, Jeong-Hak ; Ahn, Byung-Wook ; Kim, Koung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 77~81
Structural components subjected to high frequency vibrations, such as those used in vibrating parts of gas turbine engines, are usually required to avoid resonance frequencies. Generally, the operating frequency is designed at more than resonance frequencies. When a vibrating structure starts or stops, the structure has to pass through a resonance frequency, which results in large stress concentration. This paper presents the transient thermoelastic stress analysis of vibrating cantilever beam using infrared thermography and finite element method (FEM). In FEM, stress concentration factor at the 2nd resonance vibration mode is calculated by the mode superposition method of ANSYS. In experiment, stress distributions are investigated with infrared thermography and dynamic stress concentration factor is estimated. Experimental result is agreed with FEM result within 10.6%. The advantage of this technique is a better immunity to contact problem and geometric limitation in stress analysis of small or micro structures.
Development of SMA-based Wireframe Structure for 2D Shape Display
Chu, Yong-Ju ; Song, Jae-Bok ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 82~88
This paper proposes a novel method of 2 dimensional shape display. Shape displays allow us to feel tile actual volume of the object, unlike conventional 2D visual displays of 3D objects. The proposed method employs a wireframe structure to present 2D or 3D objects. The wireframe is composed of small units driven by shape memory alloy (SMA) actuators. The drive unit is analogous to the agonist-antagonist system of animal musculoskeletal systems, where the SMA actuators serve as agonist and antagonist muscles. The force in the SMA actuator is controlled by electrical current. The drive unit is equipped with the locking mechanism so that it can sustain the external force exerted by the user as well as the own weight of the wireframe structure. By controlling the current into the SMA actuator and locking mechanism, we can control the angle of the drive unit. A chain of drive units enables presentation of 2 dimensional objects. 3 dimensional presentations are possible by collecting the chains of drive units.
Use of a Prism to Compensate the Image-shifting Error of the Acousto-optic Tunable Filter
Ryu, Sung-Yoon ; You, Jang-Woo ; Kwak, Yoon-Keun ; Kim, Soo-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 89~95
The Acousto-Optic Tunable Filter (AOTF) is a high-speed full-field monochromator which generates two spectrally filtered light beams with ordinary and extraordinary polarization state. Thus, AOTF is widely used to build full-field spectral imaging system or spectral domain interferometer. However, AOTF has a big problem that the angle of diffracted light changes according to the scanning of wavelength, which makes image shift on CCD plane In this paper, we propose an analytic design of prism system to compensate the image shift. The detailed analysis of light paths in a prism and basic experimental results are presented to verify our proposed compensation method. The experimental results agree with simulation results based on suggested prism model and image shift is minimized at optimal condition. Also, it can be extended to compensate the image shift for ordinary and extraordinary polarized light simultaneously.
Gravure Offset Printing for Printed Electronics
Kim, Chung-Hwan ; Choi, Byung-Oh ; Ryu, Byung-Soon ; Kim, Dong-Soo ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 96~102
Manufacturing of printed electronics using printing technology has begun to get into the hot issue in many ways due to the low cost effectiveness to existing semi-conductor process. This technology, with low cost and high productivity, can make it possible to produce printed electronics such as TFT, solar cell, RFID Tag, printed battery, and so on. In this study, apparatus of gravure-offset printing are developed for fine line-width/gap printing and the results obtained from the apparatus shows that it is possible to make around 20 micro-meter line-width/gap printing patterns. The roll-to-roll printing system for fine line-width printing based on primary experiment is presented. The printing results obtained from the system shows around 30 micro-meter line-width/gap printing patterns.
Material Property Estimation of Paper for Dynamic Behavior Simulation
Lee, Geun-Pyo ; Choi, Jin-Hwan ; Lee, Soon-Geul ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 103~111
This study proposes a technique to estimate the material property of a paper by using an experimental methods and commercial CAE software. Under gravitation, if one side of the paper is attached to the ground, the opposite side of paper is largely deformed, and vibrates freely. Since the paper has an orthotropic characteristic due to its treatment, the deformations in two orthogonal directions of the dry paper are different. An experimental method to measure the static deformation of the paper introduces this phenomenon. And dynamic behavior, frequency of free vibration is measured. And then. virtual prototypes that can represent the static and dynamic behavior are modeled by using the commercial CAE software
/MTT3D, which has been widely used by the printer makers. While comparing the deformation and frequency from the experiment and simulation, a design optimization technique in the commercial CAE software of R-INOPL,
/AutoDesign is used to estimate the material property such as Young's modulus, shear modulus and density of the paper.
A Numerical Analysis with the FSI Mode on the Characteristics of Flow Field and Discharge Valve Motion in a Rotary Compressor
Chae, Hee-Moon ; Kim, Chang-Nyung ; Park, Sung-Kwan ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 112~120
This study has been conducted to investigate the characteristics of flow field and discharge valve motion in a rotary compressor. In this study, a transient three-dimensional numerical analysis using FSI(Fluid-Structure Interaction) model has been employed to analyze the interaction between the discharge valve and the refrigerants in the rotary compressor. It has been observed that two peaks have appeared in the displacement of the discharge valve. The maximum displacement of the discharge valve has been found to be located at the second peak. Also, the input pressure of the refrigerants has been compared with the pressures of the muffler passage and the compressor outlet in the rotary compressor. The pressure has decreased along the pathway in the rotary compressor. And the volume flow rates obtained from the current numerical study have been compared with the experiment at data to verify the validity of the present numerical study. This study may supply the fundamental data for the design of rotary compressors.
Stability Analysis of Pipe Conveying Fluid with Crack and Attached Masses
Son, In-Soo ; Yoon, Han-Ik ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 121~131
In this paper, the dynamic stability of a cracked simply supported pipe conveying fluid with an attached mass is investigated. Also, the effect of attached masses on the dynamic stability of a simply supported pipe conveying fluid is presented for the different positions and depth of the crack. Based on the Euler-Bernoulli beam theory, the equation of motion can be constructed by the energy expressions using extended Hamilton's principle. The crack section is represented by a local flexibility matrix connecting two undamaged pipe segments. The crack is assumed to be in the first mode of a fracture and to be always opened during the vibrations. Finally, the critical flow velocities and stability maps of the pipe conveying fluid are obtained by changing the attached masses and crack severity. As attached masses are increased, the region of re-stabilization of the system is decreased but the region of divergence is increased.
The Shape Optimization of washing Machine Shaft for High-Speed Rotation through Analysis of Static and Dynamic Characteristics
Kim, Eui-Soo ; Lee, Jung-Min ; Kim, Byung-Min ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 132~139
To meet demand of big capacity and high speed rotation for washing machine, more stress from bending and twisting are complexly loaded onto the shaft supporting the horizontal drum, causing problems in fracture strength and fatigue life. Also, Vibration occurs due to the frequency of the rotating parts. But, shaft has various design factors such as diameter and distance between bearings according to configuration of shaft, the optimal values can't be easily determined. Using a design of experiment (DOE) based on the FEM (Finite Element Method), which has several advantages such as less computing, high accuracy performance and usefulness, this study was performed investigating the interaction effect between the various design factor as well as the main effect of the each design factor under bending, twist and vibration and proposed optimum design using center composition method among response surface derived from regression equation of simulation-based DOE.
Fabrication and Mechanical Properties of Carbon Nanotube Probe for Ultrasmall Force Measurement in Biological Application
Kwon, Soon-Geun ; Park, Hyo-Jun ; Lee, Hyung-Woo ; Kwak, Yoon-Keun ; Kim, Soo-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 140~147
In this study, a carbon nanotube probe (CNT probe) is proposed as a mechanical force transducer for the measurement of pico-Newton (pN) order force in biological applications. In order to measure nantube's displacement in the air or liquid environment, the fabrication of a CNT probe with tip-specific loading of fluorescent dyes is performed using tip- specific functionalization of the nanotube and chemical bonding between dyes and nanotube. Also, we experimentally investigated the mechanical properties of the CNT probe using electrostatic actuation and fluorescence microscope measurement. Using fluorescence measurement of the tip deflection according to the applied voltage, we optimized the bending stiffness of the CNT probe, therefore determined the spring constant of the CNT probe. The results show that the spring constant of CNT probes is as small as 1 pN/nm and CNT probes can be used to measure pN order force.
Effect of Whole Body Vibration on Osteoporotic Trabecular Bone of Rats - Compared with the Effect of Actonel
Ko, Chang-Yong ; Lee, Tae-Woo ; Woo, Dae-Gon ; Kim, Hyo-Seon ; Kim, Han-Sung ; Lee, Beob-Yi ; Lim, Do-Hyung ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 148~154
Pharmacotherapy was mainly used to treat osteoporosis. However, some researches showed that pharmacotherapy could induce unexpected adverse effects. Some studies showed that whole body vibration affected beneficially osteoporosis. This paper studied the effect of whole body vibration fur osteoporosis compared with the effect of pharmacotherapy. 10 female rats were used and allocated into 4 group, CON, SHAM, DRUG, and WBV. Rats except SHAM group were ovariectomised to induce osteoporosis. Rats in WBV group were stimulated in whole body vibration at magnitude of
and frequency 45Hz, for 8 weeks (30 min/day, 5 days/week). Rat in DRGU group was orally administered the Actonel (0.58mg/Kg), for 8 weeks (5days/week). The
lumbar in rats were scanned at a resolution of
at baseline, before stimulation, and 8 weeks after stimulation by In-vivo micro computed tomography. For detecting and tracking changes of biomechanical characteristics (morphological and mechanical characteristics) in lumbar trabecuar bone of rats, structural parameters were measured and calculated from acquiring images and finite element analysis was performed. In the results, loss of quantity and change of structure of trabecular bone in WBV group were smaller than those in both CON and SHAM groups. In addition, mechanical strength in WBV group was stronger than that in both CON and SHAM groups. In contrast, biomechanical characteristics in WBV group were similar with those in DRUG group. These results showed that reasonable whole body vibration was likely to treat osteoporosis and be substituted partly for drug treatment.
A Study ef Biomechanical Response in Human Body during Whole-Body Vibration through Musculoskeletal Model Development
Choi, Hyun-Ho ; Lim, Do-Hyung ; Hwang, Seon-Hong ; Kim, Young-Ho ; Kim, Han-Sung ;
Journal of the Korean Society for Precision Engineering, volume 25, issue 5, 2008, Pages 155~163
This study investigated biomechanical response through the 3-dimensional virtual skeletal model developed and validated. Ten male subjects in standing posture were exposed to whole body vibrations and measured acceleration on anatomical of interest (head,
lumbar, knee joint and bottom of the vibrator). Three dimensional virtual skeletal model and vibration machine were created by using BRG LifeMOD and MSC.ADAMS. The results of forward dynamic analysis were compared with results of experiment. The results showed that the accuracy of developed model was
for all conditions.