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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
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Journal DOI :
Korean Society of Precision Engineering
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Volume & Issues
Volume 24, Issue 12 - Dec 2007
Volume 24, Issue 11 - Nov 2007
Volume 24, Issue 10 - Oct 2007
Volume 24, Issue 9 - Sep 2007
Volume 24, Issue 8 - Aug 2007
Volume 24, Issue 7 - Jul 2007
Volume 24, Issue 6 - Jun 2007
Volume 24, Issue 5 - May 2007
Volume 24, Issue 4 - Apr 2007
Volume 24, Issue 3 - Mar 2007
Volume 24, Issue 2 - Feb 2007
Volume 24, Issue 1 - Jan 2007
Selecting the target year
Displacement Measurement by Using Laser of Two Type and Speckle Method
Kim, Kyoung-Suk ; Jung, Hyun-Chul ; Jang, Su-Ok ; Jung, Sung-Wook ; Choi, Tae-Ho ; Chang, Ho-Sub ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 7~14
Synthetic Heterodyne Interferometry for Measuring Small Amplitude of Vibration
Kang, Seong-Gu ; La, Jong-Pil ; Yoon, Hee-Sun ; Park, Kyi-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 15~21
Application of Laser-Generated Guided Waves for Quantitative Evaluation of Local Wall Thinning in Carbon Steel Pipe
Lee, Joon-Hyun ; Park, Jong-Ho ; Song, Bong-Min ; Lee, Seung-Joon ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 22~28
Quantitative Evaluation of Delamination in CFRP Using Laser-Based Ultrasound
Lee, Joon-Hyun ; Lee, Seung-Joon ; Choi, Sang-Woo ; Byun, Joon-Hyung ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 29~36
Optical Measurement Using Laser Speckle Interferometry
Kim, Myung-Soo ; Baek, Tae-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 37~43
Process Analysis and Die Design for Al3003 Condenser Tube Extrusion with 12 Cell
Lee, Sang-Ho ; Lee, Jung-Min ; Jo, Hyung-Ho ; Jo, Hoon ; Kim, Mun-Bae ; Kim, Byung-Min ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 44~51
Condenser tubes are mainly produced by precision extrusion with a porthole die and are used in the flow pass of refrigerant cooling systems in automobiles. The recent technical trend of condenser tube requires the tube to be of more multi cellizing, high strength and small size, and to increase the heat transfer area and heat efficiency. Hence, this paper is shown that the results of FE-simulation are in good agreement with the experimental ones. Finally, the extrusion die shape is proposed through analysis of FE-simulation and performance of trial extrusion. Chamber shape dimension and initial temperatures of die is adjusted analysis results. And the possibility of extrusion is estimated that forming load, welding pressure and stress analysis of die in this paper. The validity of simulated results was verified into extrusion experiments on the condenser tubes.
Elliptical Vibration Cutting with Variable Trajectory for Ultra-precision Micro-Machining
Kim, Gi-Dae ; Loh, Byoung-Gook ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 52~58
A cutting device capable of generating various shapes of the cyclic elliptical trajectory of a cutting tool was proposed and micro v-grooving experiments were performed to investigate the characteristics of elliptical vibration cutting (EVC). The proposed cutting device is comprised of a pair of parallel piezoelectric actuators with which harmonic voltages of varying phase difference and magnitude are supplied, creating various shapes of the elliptical tool path. The attributes of the elliptical locus involving the direction of the axis of an ellipse, the rotational direction and amplitudes of a trajectory were fine-tuned for stable operation of the EVC. The EVC characteristics performed with brass and copper revealed reduction in the cutting resistance and suppression of burr formation, resulting in the enhancement of form accuracy of machined micro-features. While the effect of the EVC increases with the increase of excitation frequency and the amplitude, it is found that a change in the cutting force decreases as the amplitude of an elliptical locus increases.
Gain Scheduled State Feedback and Disturbance Feedforward Control for Systems with Bounded Control Input - Theory
Kang, Min-Sig ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 59~65
A new optimal state feedback and disturbance feedforward control design in the sense of minimizing
-gain from disturbance to control output is proposed for disturbance attenuation of systems with bounded control input and measurable disturbance. The controller is derived in the framework of linear matrix inequality(LMI) optimization. A gain scheduled state feedback and disturbance feedforward control design is also suggested to improve disturbance attenuation performance. The control gains are scheduled according to the proximity to the origin of the state of the plant and the magnitude of disturbance. This procedure yields a stable linear time varying control structure that allows higher gain and hence higher performance controller as the state and the disturbance move closer to the origin. The main results give sufficient conditions for the satisfaction of a parameter-dependent performance measure, without violating the bounded control input condition.
Development of Robot System for Automatic Cleaning and Inspection of Live-line Suspension Insulator Strings and Its Application
Park, Joon-Young ; Cho, Byung-Hak ; Byun, Seung-Hyun ; Lee, Jae-Kyung ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 66~75
To prevent an insulator failure, an automatic cleaning and inspection robot was developed for suspension insulator strings. The robot autonomously moves along the insulator string using the clamps installed on its two moving frames. Especially, unlike the existing cleaning robots using jets of water, the robot system adopts a dry cleaning method using rotating brushes and a circular motion guide. In addition, a mechanized brush bristles and a voltage-balancing contactor are devised to increase cleaning efficiency and to prevent arc generation under live-line conditions, respectively. We confirmed its effectiveness through experiments.
An Experimental Analysis on Dark-field Laser Scattering for the Surface Inspection of Infrared Cut-off Filters
Kim, Gyung-Bum ; Han, Jae-Chul ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 76~83
The dark-field laser scattering system has been developed to inspect surface defects in infrared cut-off filters and then laser scattering characteristics against the defects are investigated. The qualitative analysis for the reliable and accurate detection performance is described through the correlation between incident angles of a laser and viewing ones of a camera. In this paper, reliable and important information with laser scattering is given for the surface defect inspection of IR filters. Its performance has been verified through various experiments.
Injection Mold with Cavity Pressure/Temperature Sensors for Standard Tensile Test Specimen
Lee, Do-Myoung ; Han, Byoung-Kee ; Lee, Sung-Hee ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 84~90
In this study, design and manufacturing of plastic injection mold with cavity pressure/temperature sensors were performed fur tensile test specimen. International standard system for plastic tensile specimen was applied to design an injection molding system. Cavity pressure and temperature sensors were placed on the side of fixed platen of the injection mold to prevent them from external impact damage. Injection molding experiments with variations of injection speed and melt temperature were performed and then tensile test of the manufactured polycarbonate specimens was also performed. It was shown that injection molding processing parameters can have effect on the mechanical properties of the plastic injection molded part.
A Control Strategy for Systems with Single Flexible Mode to Reduce Residual Vibration
Shin, Young-Joo ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 91~100
Many manufacturing devices must execute motions as quickly as possible to achieve profitable high-volume production. Most of them have devices having flexibility and a time delay of one sampling is added to the plants when they are controlled by fast discrete controllers, which brings about non-minimum phase zeros. This paper develops a control strategy that combines feedforward and feedback control with command shaping for such devices. First, the feedback controller is designed to increase damping and eliminate steady-state error. Next, the feedforward controller is designed to speed up the transient response. Finally, an appropriate reference profile is generated using command-shaping techniques to ensure fast point-to-point motions with minimum residual vibration. The particular focus of the paper is to understand the interactions between these individual control components. The resulting control strategy is demonstrated on a model of a high-speed semiconductor manufacturing machine.
Performance Analysis of the Industrial Inkjet Printing Head Using 1D Lumped Model
Sim, Won-Chul ; Kim, Young-Jae ; Park, Chang-Sung ; Yoo, Young-Seuck ; Joung, Jae-Woo ; Oh, Yong-Soo ; Park, Sung-Jun ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 101~107
Jettability analysis using one-dimensional(1D) lumped parameter model has been investigated to design the industrial inkjet head with proper drop velocity and drop volume. By simplifying the inkjet head system into an equivalent electrical circuit, lumped model has been developed. Performance of the lumped model is verified by the comparison between measured results of droplet velocity and ejection volume and predicted value. Also, the jetting performance of an inkjet head is characterized by varying the design parameter and driving condition. As a result, simulation results shows good agreement with the experimentally measured value. The developed lumped model enables to easily understand the effect of dimension change and predict the jetting performance.
Nano-size Patterning with a High Transmission C-shaped Aperture
Park, Sin-Jeung ; Kim, Yong-Woo ; Lee, Eung-Man ; Hahn, Jae-Won ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 108~115
We have designed a high transmission C-shaped aperture using finite differential time domain (FDTD) technique. The C-shaped aperture was fabricated in the aluminum thin film on a glass substrate using a focused ion beam (FIB) milling. Nano-size patterning was demonstrated with a vacuum contact device to keep tight contact between the Al mask and the photoresist. Using 405 nm laser, we recorded a 50 nm-size dot pattern on the photoresist with the aperture and analyzed the spot size dependent on the dose illuminated on the aperture.
Development on Human Muscle Skeletal Model and Stress Analysis of Kumdo Head Hitting Motion
Lee, Jung-Hyun ; Lee, Se-Hoon ; Lee, Young-Shin ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 116~125
Human muscle skeletal model was developed for biomechanical study. The human model was consists with 19 bone-skeleton and 122 muscles. Muscle number of upper limb, trunk and lower limb part are 28, 60, 34 respectively. Bone was modeled with 3D beam element and muscle was modeled with spar element. For upper limb muscle modelling, rectus abdominis, trapezius, deltoideus, biceps brachii, triceps brachii muscle and other main muscles were considered. Lower limb muscle was modeled with gastrocenemius, gluteus maximus, gluteus medius and related muscles. The biomechanical stress and strain analysis of human was conducted by proposed finite element analysis model under Kumdo head hitting motion. In this study structural analysis has been performed in order to investigate the human body impact by Kumdo head hitting motion. As the results, the analytical displacement, stress and strain of human body are presented.
Intelligent Automated Detection System of Tuberculosis Bacilli by Using Their Color Information
Cho, Sung-Man ; Kim, Gi-Bom ; Lim, Choong-Hyuk ; Joo, Won-Jong ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 126~133
Tuberculosis (TB) is a chronic or acute infectious disease which damages more people than any other infectious diseases according to WHO estimates. In this paper, a new automatic detection system of tuberculosis bacilli by using their color information is proposed. Through the deep investigation of color and intensity compositions of tuberculosis images, new pre-processing and segmentation algorithms are suggested. Specific features of bacilli are extracted from the processed images and number counting is done by using domain-specific knowledge rules.
Shape Deformation of Triangular Net
Yoo, Dong-Jin ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 134~143
A new approach based on mean value coordinate combined with Laplacian coordinate is proposed for shape deformation of a large polygon model composed of triangular net. In the method, the spherical mean value coordinates for closed control meshes is introduced to describe a vertex in the triangle meshes to be deformed. Furthermore, the well known quardratic least square method for the Laplacian coordinates is employed in order to deform the control meshes. Because the mean value coordinates are continuous and smooth on the interior of control meshes, deforming operation of control meshes change the shape of polygon model while preserving the intrinsic surface detail. The effectiveness and validity of this novel approach was demonstrated by using it to deform large and complex polygon models with arbitrary topologies.
Automatic Generation of the Input Data for Rapid Prototyping from Unorganized Point Cloud Data
Yoo, Dong-Jin ;
Journal of the Korean Society for Precision Engineering, volume 24, issue 11, 2007, Pages 144~153
In order to generate the input data for rapid prototyping, a new approach which is based on the implicit surface interpolation method is presented. In the method a surface is reconstructed by creating smooth implicit surface from unorganized cloud of points through which the surface should pass. In the method an implicit surface is defined by the adaptive local shape functions including quadratic polynomial function, cubic polynomial function and RBF(Radial Basis Function). By the reconstruction of a surface, various types of error in raw STL file including degenerated triangles, undesirable holes with complex shapes and overlaps between triangles can be eliminated automatically. In order to get the slicing data for rapid prototyping an efficient intersection algorithm between implicit surface and plane is developed. For the direct usage for rapid prototyping, a robust transformation algorithm for the generation of complete STL data of solid type is also suggested.