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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 26, Issue 12 - Dec 2009
Volume 26, Issue 11 - Nov 2009
Volume 26, Issue 10 - Oct 2009
Volume 26, Issue 9 - Sep 2009
Volume 26, Issue 8 - Aug 2009
Volume 26, Issue 7 - Jul 2009
Volume 26, Issue 6 - Jun 2009
Volume 26, Issue 5 - May 2009
Volume 26, Issue 4 - Apr 2009
Volume 26, Issue 3 - Mar 2009
Volume 26, Issue 2 - Feb 2009
Volume 26, Issue 1 - Jan 2009
Selecting the target year
3D Packaging Process using TSV and Bonding Machine Technology
Song, Jun-Yeob ; Lee, Jae-Hak ; Ha, Tae-Ho ; Lee, Chang-Woo ; Yoo, Choong-Don ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 9~17
Technologies of TSV Filling and Solder Bumping for 3D Packaging
Yoo, Se-Hoon ; Ko, Young-Ki ; Shin, Yue-Seon ; Lee, Chang-Woo ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 18~22
Numerical Study of Thermo-mechanical Stress on TSV
Choi, Jin-Young ; Song, Cha-Gyu ; Lee, Haeng-Soo ; Choa, Sung-Hoon ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 23~31
DRIE Technology for TSV Fabrication
Baek, Kyu-Ha ; Kim, Dong-Pyo ; Park, Kun-Sik ; Kang, Jin-Young ; Lee, Ki-Jun ; Do, Lee-Mee ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 32~40
Fabrication of Through Silicon Via using Laser Drilling Process
Shin, Dong-Sig ; Suh, Jeong ; Lee, Jae-Hoon ; Kim, Kyung-Han ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 41~46
The Cutting Tool-workpiece Interference Simulation for Worm Screw Machining by Planetary Milling
Lee, Min-Hwan ; Kim, Sun-Ho ; Ahn, Jung-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 47~54
A worm screw is widely used in a geared motor unit for motion conversion from rotation to linear. For mass production of a high quality worm, the current rolling process is substituted with the milling process. Since the milling process enables the integration of all operations of worm manufacturing on a CNC(Computer Numerical Control) lathe, productivity can be remarkably improved. In this study, the tooling system for planetary milling on a CNC lathe to improve machinability is developed. However, the cutting tool-workpiece interference is important factors to be considered for producing high quality worms. For adaptability of various worms machining, the tool-workpiece interference simulation system based on a tool-tip trajectory model is developed. The developed simulation system is verified through several kinds of worms and experimental results.
Integrated Auto-Tuning of a Multi-Axis Cross-Coupling Control System
Lee, Hak-Chul ; Jee, Sung-Chul ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 55~61
Machining systems have been evolved to produce more detailed products of high added value. This has been possible, in large part, due to the development of highly accurate multi-axis CNC machine tools. The conventional CNC of machine tools has individual axis controllers to maximize tracking performance. On the other hand, cross-coupling controllers can be integrated into the conventional CNC to enhance contouring performance. For this multi-axis cross-coupling control system, it is necessary to automatically adjust the controller gains depending on operating conditions and/or other external conditions from an optimization perspective. This paper proposes automatic modeling of feed drive systems that minimizes the difference in behavior between the system model and the actual system. Based on the modeling, an integrated auto-tuning method is also proposed to improve both tracking and contouring accuracy of a 3-axis cross-coupling control system as well as users' convenience. The proposed methods are evaluated by both simulation and experiments.
The Study of Non-contact Thickness Measurement of Thin Transparent Object
Hong, Jun-Hee ; Jeong, Seok-Kyu ; Park, Simon S. ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 62~68
In this paper, we investigate a new method to measure the thickness of thin transparent objects utilizing a step index multi-mode optical fiber sensor. The method mainly depends on the refraction rate of transparent target, the diameter of optical fibers and the distance to reflector. We confirmed the effects of these parameters through the experimental verification tests. The comparison between the theoretical vs. analytical results shows good agreements with each other. The proposed model also enables users to measure the thickness of thin transparent objects without considering the reflection from the target. This approach provides simple, cost-effective and non-contact solutions to measure the thickness.
Autonomous Parking of a Model Car with Trajectory Tracking Motion Control using ANFIS
Chang, Hyo-Whan ; Kim, Chang-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 69~77
In this study an ANFIS-based trajectory tracking motion control algorithm is proposed for autonomous garage and parallel parking of a model car. The ANFIS controller is trained off-line using data set which obtained by Mandani fuzzy inference system and thereby the processing time decreases almost in half. The controller with a steering delay compensator is tuned through simulations performed under MATLAB/Simulink environment. Experiments are carried out with the model car for garage and parallel parking. The experimental results show that the trajectory tracking performance is satisfactory under various initial and road conditions
Development of 6-axis Force/moment Sensor for Humanoid Robot's Head Reacting to a External Force
Kim, Gab-Soon ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 78~84
When external force is applied to humanoid robot's head, humanoid robot's neck is rotated to prevent the damage of it. So, robot's neck have to perceive forces (Fx of x-direction, Fy of y-direction and Fz of z-direction) and moments (Mx of x-direction, My of y-direction and Mz of z-direction) using the attached 6-axis force/moment sensor. Thus, in this paper, 6-axis force/moment sensor was developed to sense the forces and moments applied to robot's head. The structure of 6-axis force/moment sensor was modeled newly, and it was designed using FEM software (ANSYS) and manufactured by attaching straingages on the sensing element, finally, the characteristic test of the sensor was carried out. As a result, it is confirmed that interference error is less than 3%. And, it is thought that the sensor can be used to measure the forces and the moments for humanoid robot's head.
A Study on Thermal and Fluid Characteristics inside Engine Room of Auxiliary Power Unit for Tracked Vehicle
Lee, Tae-Eui ; Suh, Jeong-Se ; Jeong, Sang-Hwan ; Park, Young-Sik ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 85~93
This research is intended to grasp the characteristics of heat flow inside auxiliary power device engine room to obtain the design basic data through numerical analysis and experiment. For experiment cost reduction, numerical analysis was done to obtain quantitative data by observing the change in temperature distribution of major parts according to changes in normal condition, incompressible condition, engine surface heat emission rate and absorption temperature with the use of commercial STAR-CD. The experiment was done by grasping the temperature distribution of major interested parts inside engine room in loaded and unloaded conditions during engine operation. The temperature distribution data here will serve as useful design data during APU engine room designing.
A Process Analysis for Manufacturing the Sleeve Spring of the Torsional Vibration Damper
Hwang, Beom-Cheol ; Bae, Won-Byong ; Kim, Chul ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 94~101
In diesel engines, it is inevitable that the torsional vibration is produced by the fluctuation of engine torque. Therefore, it is necessary to establish preventive measures to diminish the torsional vibration. The sleeve spring type damper is one of the preventive measures for reducing the torsional vibration. In this study, 2-roll bending process was proposed to manufacture sleeve spring; The program to calculate the initial radius including springback effect was developed and the FEA method to analyze elasto-plastic problem was verified through analysis of 90 degree bending process. The elasto-plastic analysis of 2-roll bending process was carried out by the FEA method verified to set a new criterion, and the new process design parameter(contact angle) in the 2-roll bending process was proposed.
Structural Optimization of a Manifold Valve for Pressure Vessel
Bae, Tae-Sung ; Kim, Si-Pom ; Lee, Kwon-Hee ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 102~109
This study proposes the structural optimization of a manifold valve. FE analysis is performed to evaluate the strength of a manifold valve. In addition, the structural optimization technique is applied to reduce its weight. In this study, the optimization method using the kriging interpolation method is adopted to obtain the minimum weight satisfying the strength constraint. The maximum stress and the weight are replaced by the metamodels. In this process, tile sample points are generated by latin-hypercube design. Optimum designs are obtained by ANSYS Workbench and the in-house program.
A Study on Residual Stress Analysis of Autofrettaged Thick-walled Cylinders
Kim, Jae-Hoon ; Shim, Woo-Sung ; Lee, Young-Shin ; Cha, Ki-Up ; Hong, Suck-Kyun ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 110~116
Thick-walled cylinders, such as a cannon or nuclear reactor, are autofrettaged to induce advantageous residual stresses into pressure vessels and to increase operating pressure and the fatigue lifetimes. As the autofrettage level increases, the magnitude of compressive residual stress at the bore also increases. However, the Bauschinger effect reduces the compressive residual stresses as a result of prior tensile plastic strain, and decreases the beneficial autofrettage effect. The purpose of the present paper is to predict the accurate residual stress of SNCM8 high strength steel using the Kendall model which was adopted by ASME Code. The uniaxial Bauschinger effect test was performed to decide BEF, then this constant was used in calculation. There were some differences between theoretical solution and modified solution.
Friction Drag Reduction using Microstructured Surfaces
Park, Chi-Yeol ; Bae, Seung-Il ; Lee, Sang-Min ; Ko, Jong-Soo ; Chung, Kwang-Hyo ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 117~122
The hexagonal network-type PDMS microstructures were fabricated and they were employed to low-friction drag surfaces. While the lowest contact angle measured from the smooth surface was
the highest contact angle measured from the microstructured surfaces was
The moving speed of bullet-type capsule attached with a PDMS pad of smooth surface (
) was 0.1261 m/s and that with a PDMS pad of microstructured surface (
) was 0.1464 m/s. Compared with the smooth surface, the microstructured surface showed 16.1% higher moving speed. The network-type microstructures have a composite surface that is composed with air and PDMS solid. Therefore, the surface does not wet: rather water is lifted by the microstructures. Because of the composite surface, water shows slip-flow on the microstructures, and thus friction drag can be reduced.
Application of the Polymer Behavior Model to 3D Structure Fabrication
Kim, Jong-Young ; Cho, Dong-Woo ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 123~130
This study presents the application of a polymer behavior model that considers fluid mechanics and heat transfer effects in a deposition system. The analysis of the polymer fluid properties is very important in the fabrication of precise microstructures. This fluid behavior model involves the calculation of velocity distribution and mass flow rates that include the effect of heat loss in the needle. The effectiveness of the proposed method was demonstrated by comparing estimated mass fluid rates with experimental values. The mass fluid rates under various process conditions, such as pressure, temperature, and needle size, reflected the actual deposition state relatively well, and the assumption that molten polycaprolactone(PCL) is a non-Newtonian fluid was reasonable. The successful fabrication of three-dimensional microstructures demonstrated that the model is valid for predicting the polymer behavior characteristics in the microstructure fabrication process. The results of this study can be used to investigate the effect of various parameters on fabricated structures before turning to experimental approaches.
Age-related Deficits in Response Characteristics on Safety Warning of Intelligent Vehicle
Kim, Man-Ho ; Lee, Yong-Tae ; Son, Joon-Woo ; Jang, Chee-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 131~137
Recent technological advances made a vehicle more intelligent to increase safety and comfort. An intelligent vehicle provides drivers with safety warning information through audible sounds, visual displays, and tactile devices. However, elderly drivers have been known to decrease the physical and cognitive abilities such as muscular strength, hearing, eyesight, short term memory, and spatial perception. Therefore, possible age-related deficits should be considered to design an effective warning system. This paper aims to evaluate the impact of advancing age on response performance on audible safety warnings which are widely used for alerting driving hazards. In order to understand the effect of age-related hearing loss and movement slowing, three sound characteristics (frequency, intensity, and period) and three age groups (younger, middle, and older) are considered. Data was drawn from 38 drivers who drove a simulated rural road in a driving simulator. Experimental results show that age influences driver's response performance. In conclusion, the appropriate range of a warning sound is suggested.
Development of 3D Modeling Technology of Human Vacancy for Bio-CAD
Kim, Ho-Chan ; Bae, Yong-Hwan ; Kwon, Ki-Su ; Seo, Tae-Won ; Lee, Seok-Hee ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 138~145
Custom medical treatment is being widely adapted to lots of medical applications. A technology for 3D modeling is strongly required to fabricate medical implants for individual patient. Needs on true 3D CAD data of a patient is strongly required for tissue engineering and human body simulations. Medical imaging devices show human inner section and 3D volume rendering images of human organs. CT or MRI is one of the popular imaging devices for that use. However, those image data is not sufficient to use for medical fabrication or simulation. This paper mainly deals how to generate 3D geometry data from those medical images. A new image processing technology is introduced to reconstruct 3D geometry of a human body vacancy from the medical images. Then a surface geometry data is reconstructed by using Marching cube algorithm. Resulting CAD data is a custom 3D geometry data of human vacancy. This paper introduces a novel 3D reconstruction process and shows some typical examples with implemented software.
Development of Reflected Type Photoplethysmorgraph (PPG) Sensor with Motion Artifacts Reduction
Han, Hyo-Nyoung ; Lee, Yun-Joo ; Kim, Jung-Sik ; Kim, Jung ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 12, 2009, Pages 146~153
One of the most important issues in the wearable healthcare sensors is to minimize the motion artifacts in the vital signals for continuous monitoring. This paper presents a reflected type photoplethysmograph (PPG) sensor for monitoring heart rates at the artery of the wrist. Active noise cancellation algorithm was applied to compensate the distorted signals by motions with Least Mean Square (LMS) adaptive filter algorithms, using acceleration signals from a MEMS accelerometer. Experiments with a watch type PPG sensor were performed to validate the proposed algorithm during typical daily motions such as walking and running. The developed sensor is suitable for ubiquitous healthcare system and monitoring vital arterial signals during surgery.