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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
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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
Application of RP&M for Bio and Nano Technology
Yang, Dong-Yol ; Kim, Hyo-Chan ; Park, Sang-Hu ; Lim, Tae-Woo ; Park, Seuk-Hee ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 7~16
Development of Electronic Parts Manufacturing Process Using Functional Prototype Fabrication Technology
Im, Yong-Gwan ; Cho, Byung-Hee ; Jeong, Hae-Do ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 17~23
Applications of Rapid Prototyping and Manufacturing Technologies to Bio-Medical Engineering
Ahn, Dong-Gyu ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 24~33
Aligning Method using Concentric
in Nanoimprint Lithography
Kim, Gee-Hong ; Lee, Jae-Jong ; Choi, Kee-Bong ; Park, Soo-Yeon ; Cho, Hyun-Taek ; Lee, Jong-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 34~41
Nanoimprint lithography is an emerging technology which has an ability to make patterns under 100nm width. Recently many researches have been focused to develop multilayer patterning function in nanoimprint lithography and aligning method is attracting attention as a key technology.
has been used widely to measure dislocation or deformation of objects and considered one of the best solutions to detect aligning error in nanoimprint lithography. Concentric circular patterns are used to generate a
fringe in this paper and aligning offset and direction are extracted from it. Especially this paper shows the difference of fringe equation of
which can be obtained in nanoimprint process atmosphere from normal one.
Error-compensating Techniques in 3-Point Weighing Method to Measure Unbalance Properties
Lee, Sun-Pyo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 42~49
In this paper error-compensating techniques in three-point weighing method to precisely measure unbalance properties such as center of gravity and unbalance moment. In the conventional static methods, 1) fixture-errors, 2) effects of the contact between the fixture and the load scales, and 3) side effect due to the lateral frictional forces acting on the contact points between the fixture and the load scales are the major factors that lead to measurement errors. The proposed error-compensating method perfectly eliminates both the fixture-error and the contact-error simultaneously by manipulating the three measured reaction forces at three different angular locations. Also the friction-error is calibrated by comparing the sum of three reactions with the actual mass of the specimen. A set of measurement is performed using the same measuring system as Lee's, and a comparison of the results from the convectional, Lee's, and the proposed method is provided. The results show that the proposed method effectively compensates the errors listed above.
A Study on the Water Absorption Diagnosis Method through Capacitance Measurement for Generator Stator Windings
Kim, Hee-Soo ; Bae, Yong-Chae ; Kee, Chang-Doo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 50~57
The water leak in water-cooled generator stator windings can generate the serious accidents such as insulation breakdown and it brings a generator to the unexpected sudden outage. Accordingly, it is important to diagnose the water absorption of them for the effective operation of power plant. Especially, the capacitance value which is measured for diagnosis is very small so the special diagnosis methods like stochastic theory are needed. KEPRI developed the water absorption test equipment and diagnosis technology for them. The developed diagnosis technology is applied to the real system and the results of water absorption test for stator windings are agreed to them of water leak test.
A Study on Intelligent Robot Bin-Picking System with CCD Camera and Laser Sensor
Kim, Jin-Dae ; Lee, Jeh-Won ; Shin, Chan-Bai ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 58~67
Due to the variety of signal processing and complicated mathematical analysis, it is not easy to accomplish 3D bin-picking with non-contact sensor. To solve this difficulties the reliable signal processing algorithm and a good sensing device has been recommended. In this research, 3D laser scanner and CCD camera is applied as a sensing device respectively. With these sensor we develop a two-step bin-picking method and reliable algorithm for the recognition of 3D bin object. In the proposed bin-picking, the problem is reduced to 2D intial recognition with CCD camera at first, and then 3D pose detection with a laser scanner. To get a good movement in the robot base frame, the hand eye calibration between robot's end effector and sensing device should be also carried out. In this paper, we examine auto-calibration technique in the sensor calibration step. A new thinning algorithm and constrained hough transform is also studied for the robustness in the real environment usage. From the experimental results, we could see the robust bin-picking operation under the non-aligned 3D hole object.
Implementation of an Assembly System for Automobile Side Panel Based on Digital Manufacturing Technologies
Park, Hong-Seok ; Choi, Hung-Won ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 68~77
Nowadays, the increasing global competition forces automobile manufacturer to increase quality and to reduce the cost and time for manufacturing planning. To solve these problems, automobile manufacturers try to apply digital manufacturing technologies. In this paper, a concept of method for planning the digital assembly system is proposed. Based on the requirements of assembly tasks obtained through product analysis, the function and sequence modeling for assembly process is executed using the IDEF0 and UML model. For implementation of digital assembly system, the selected components are modeled by using 3D CAD tools. According to the system configuration strategy, lots of the alternative solutions for the assembly system are generated. Finally, the optimal assembly system is chosen by the evaluation of the alternative solutions with TOPSIS(Technique for Order Preference by Similarity to Ideal Solution) method. According to proposed procedure, digital laser welding system is implemented in DELMIA.
Optimal Die Profile Design in Tube Drawing Process for Prevention of Material Fracture
Lee, Sang-Kon ; Kim, Sang-Woo ; Lee, Young-Seon ; Lee, Jung-Hwan ; Kim, Byung-Min ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 78~84
The objective of this study is to design the optimal die profile that can prevent material fracture in the tube drawing process for automobile steering input shaft. First, the CDV(Critical Damage Value) of material is obtained by the compression test and FE-analysis. The occurrence of fracture is estimated by the FE-analysis considering the CDV. In order to achieve the objective of this study, optimization technique and FE-analysis are applied. FPS(Flexible Polyhedron Search) method, which is one of the non-gradient optimization techniques often used in engineering, is used to search optimal die profile. The drawing die profile is represented by Bezier-curve to generate all the possible die profile. Using FPS method and FE-analysis the optimal drawing die profile is determined. To verify tile effectiveness of the redesigned optimal die, the tube drawing experiment is performed. In the experimental result, it is possible to produce sound product without material fracture using the redesigned optimal die.
Strength and Dynamic Performance Analysis for Tilting Train Wheel
Hur, Hyun-Moo ; Kwon, Sung-Tae ; Seo, Jung-Won ; Kwon, Seok-Jin ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 85~92
For the improvement of a conventional railway speed, tilting train(Tilting Train express) is under the development aiming for a maximum speed 180km/h. Compared to the existing conventional rolling-stock, tilting train could take an advantage of speed improvement about
on curve sections due to the improvement of cowing performance. However, this speed increasement creates a severe load at wheels, thus it is necessary to study the safety of wheel for tilting train preferentially. On the other hand, it is under consideration that the wheel for conventional railway rolling-stock at speeds of 150km/h will be applied to tilting train at speeds of 180km/h. In this paper, we have studied the strength of wheel structure, the geometrical contact characteristics, and the dynamic performance of wheel to evaluate the safety of wheel for tilting train.
Shape Reconstruction from Large Amount of Point Data using Repetitive Domain Decomposition Method
Yoo, Dong-Jin ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 93~102
In this study an advanced domain decomposition method is suggested in order to construct surface models from very large amount of points. In this method the spatial domain of interest that is occupied by the input set of points is divided in repetitive manner. First, the space is divided into smaller domains where the problem can be solved independently. Then each subdomain is again divided into much smaller domains where the problem can be solved locally. These local solutions of subdivided domains are blended together to obtain a solution of each subdomain using partition of unity function. Then the solutions of subdomains are merged together in order to construct whole surface model. The suggested methods are conceptually very simple and easy to implement. Since RDDM(Repetitive Domain Decomposition Method) is effective in the computation time and memory consumption, the present study is capable of providing a fast and accurate reconstructions of complex shapes from large amount of point data containing millions of points. The effectiveness and validity of the suggested methods are demonstrated by performing numerical experiments for the various types of point data.
Tensile Characteristics of Silane-modified MMT/epoxy Nanocomposites
Ha, Sung-Rok ; Chung, Hyup-Jae ; Rhee, Kyong-Yop ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 103~107
It is well-known that the mechanical properties of MMT(montmorillonite) nanocomposites are better than those of conventional composites. In this study, tensile tests were performed to determine the effect of silane modification of MMT and its weight ratio on the tensile properties of MMT/epoxy nanocomposites. It was found that the tensile strength and the elastic modulus of MMT/epoxy nanocomposites increased with increasing weight ratio of MMT. The elastic modulus of silane-modified MMT/epoxy nanocomposites was higher than that of untreated MMT/epoxy nanocomposites, irrespective of weight ratio.
A Study on the Structure Improvement of Bracket Housing for Structural Noise and Vibration Reduction in Hydraulic Breaker
Kim, Bong-Suk ; Kim, Min-Gi ; Byun, Dong-Woo ; Lee, Seong-Min ; Lee, Soo-Hun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 108~115
A hydraulic breaker is widely utilized for many civil engineering areas for the purpose of destroying objects such as rocks, concrete, or road. However, since the high-level noise and vibration by a hydraulic breaker is one of the major sources of environmental noise and recently the environmental regulations on construction equipments are also getting more strengthened, in order to solve such problems, it is certainly necessary to design and develop a hydraulic breaker with low noise and low vibration. This research is to understand the noise characteristics through the noise test and acoustic analysis of the bracket housing in a hydraulic breaker and to identify the element part to be modified based on the result of the element contribution analysis. An improved breaker model including X-typed rib shows the result of low-noise level within target frequency band compared with a commercial breaker model.
Fabrication of 3-Dimensional Microstructures using Digital Micromirror Device
Choi, Jae-Won ; Ha, Young-Myoung ; Choi, Kyung-Hyun ; Lee, Seok-Hee ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 116~125
MEMS and LIGA technologies have been used for fabricating microstructures, but their shape is not 3D because of difficulty for preparation of many masks. To fabricate 3D microstructures, microstereolithography technology based on Digital Micromirror Device(
) was introduced. It has no need of masks and is capable of fabricating high aspect ratio microstructures. In this technology, STL file is the standard format as the same of conventional rapid prototyping system, and 3D parts are fabricated by layer-by-layer according to 2D section sliced from STL file. The UV light source is illuminated to DMD which makes bitmap images of 2D section, and they are transferred and focused on resin surface. In this paper, we addressed optical design of microstereolithography system in consideration of light path according to DMD operation and image-forming on the resin surface using optical design program. To verify the performance of implemented microstereolithography system, 3D microstructures with complexity and high aspect ratio were fabricated.
Effect of Stem Design on Contact Pressure and Stress Distribution of End-of-stem in Revision TKR
Kim, Yoon-Hyuk ; Kwon, Oh-Soo ; Park, Si-Mon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 11, 2006, Pages 126~134
In this study, the effect of stem-end design on contact pressure and stress distribution in revision TKR was investigated using finite element method. The finite element model of tibia, including the cortical bone, the cancellous bone and canal, was developed based on CT images. The implant models with various stem lengths, diameters, friction coefficients, and press-fit effects were considered. The results showed that the longer stem length, the stronger press-fit, the bigger stem diameter, and the higher friction coefficient increased both peak contact pressure and Von-Mises stress distributions. The results supported the clinical hypothesis that peak contact pressure and stress are related to the stem end pain. The results of this study will be useful to design the stem and reduce the end-of-stem pain in revision TKR.