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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 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
Solid Freeform Fabrication Technique in Tissue Engineering
Lee, Seung-Jae ; Cho, Dong-Woo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 7~15
Imprinting Technology of Biopolymers for Tissue Engineering
Kim, Pil-Nam ; Suh, Kahp-Yang ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 16~20
Micro/Nano Fabrication Technique in Drug Delivery System(DDS)
Chu, Won-Shik ; Kim, Sung-Geun ; Ahn, Sung-Hoon ; Ha, Won-Shik ; Chi, Sang-Chul ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 21~29
High Speed Machining Considering Efficient Manual Finishing Part I: Phase Shift and Runout Affecting Surface Integrity
Kim, Min-Tae ; Je, Sung-Uk ; Lee, Hae-Sung ; Chu, Chong-Nam ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 30~37
In this work, the surface integrity smoothened with a ball end mill was investigated. Because surface integrity mainly affects the manual finishing process,
(Remaining Volume After Machining) was introduced, and it gives the relation between machining process and finishing process. Runout and phase shift which adversely affect surface integrity were considered in the generation of surface topography. Cutting points in ball end milling were identified with positional vectors and a set of vectors which have the minimum height in unit area was selected for the generation of surface and
variation according to runout and phase shift was calculated and experimentally verified in proposed HSM conditions for mold machining. From the simulations and the experiments, a desirable High Speed Machining condition was suggested.
High Speed Machining Considering Efficient Manual Finishing Part II: Optimal Manual Finishing Process and Machining Condition
Kim, Min-Tae ; Je, Sung-Uk ; Lee, Hae-Sung ; Chu, Chong-Nam ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 38~45
In this work, optimal finish machining condition considering total time for mold or electrode manufacturing was investigated. First, manual finishing time according to the machining condition was analyzed for the work material. The effect of runout and phase shift of tool path on surface finish was also considered in those analyses. Secondly, optimal manual finishing processes were determined for various machining conditions. Finally, finish machining time and corresponding manual finishing time were taken into account for the estimation of the total time of manufacturing mold. Though small feed per tooth and pick feed reduced the manual finishing time, the finish machining time increased in such conditions. With a machining condition of feed per tooth of 0.2 mm and pick feed of 0.3 mm, the minimum total time of manufacturing mold was achieved in our machining condition.
A Self-Organizing Fuzzy Control Approach to the Driving Control of a Mobile Robot
Bae, Kang-Yul ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 46~55
A robust motion controller based on self-organizing fuzzy control(SOFC) and feed-back tracking control technique is proposed for a two-wheel driven mobile robot. The feed-back control technique of the controller guarantees the robot follows a desired trajectory. The SOFC technique of the controller deals with unmodelled dynamics of the vehicle and uncertainties. The computer simulations are carried out to verify the tracking ability of the proposed controller with various driving situations. The results of the simulations reveal the effectiveness and stability of the proposed controller to compensate the unmodelled dynamics and uncertainties.
Development of Automatic Making System of a Frame Element for Flame Prevention
Kim, Gab-Soon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 56~63
This paper describes the development of automatic making system of a frame element for flame prevention. The frame element is made by turning a thin plate and a formed plate on the small pipe. The couple plate(two plates) should be pulled with constant farce to manufacture a good frame element. This is because if the gap between one couple plate and other couple plate is different, it will not prevent flame. In this paper, the automatic making system of a frame element for flame prevention was made, and which could automatically manufacture a frame element. The characteristic test of the made frame element by that system was performed, and its result was very good.
The Equipment Design by the Fluid and Thermal Analysis of the Electromagnetic Pump for Recycling of Aluminum Scrap
Choi, Woo-Sik ; Kang, Chung-Gil ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 64~71
In this study, to design aluminum scrap recycling equipment, fluid flow and thermal analysis considering electromagnetic phenomenon were carried out by using ANSYS program. The magnetic flux generated by electromagnetic pump has influence on fluid velocity of Al liquid metal with molten metal motion and thermal generation. To investigate the effect of the number of phase on fluid flow and thermal generation, electromagnetic force and magnetic flux were obtained by computer simulation. In addition, the results obtained by fluid flow and thermal analysis, recycling equipment of aluminum scrap with the cooling technology of electromagnetic coil, the most suitable phase and current were proposed.
Vibration of Non-linear System under Random Parametric Excitations by Probabilistic Method
Lee, Sin-Young ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 72~79
Vibration of a non-linear system under random parametric excitations was evaluated by probabilistic methods. The non-linear characteristic terms of a system structure were quasi-linearized and excitation terms were remained as they were An analytical method where the square mean of error was minimized was used An alternative method was an energy method where the damping energy and restoring energy of the linearized system were equalized to those of the original non-linear system. The numerical results were compared with those obtained by Monte Carlo simulation. The comparison showed the results obtained by Monte Carlo simulation located between those by the analytical method and those by the energy method.
Computational and Experimental Investigation on U-type Seal of Hydraulic Actuator
Yoo, Myung-Ho ; Kwon, Jong-Ho ; Lee, Taek-Sung ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 80~87
Seals are usually made from elastomer, a kind of rubber, and it has the non-linearity and hyper-elasticity. U-type seals are used to prevent the leakage of internal fluid sealed in hydraulic actuator because they have more excellent performance than O-rings or rectangular seals. As a core part of hydraulic actuator, U-type seal gives much effect on performance and reliability of actuator. This study considers an NBR U-type seal under high pressure of a hydraulic actuator, and provides its deformation, stress-strain characteristic and contact force using the non-linear finite element analysis. Analysis results are compared with the experimental ones performed by the self-developed testing equipment. Verification result shows that this study presents a good application process for the effective design of U-type seals under high operation pressure.
Analysis of Head Impact Test of the Passenger Air-Bag Module Assembly by LS-DYNA Explicit Code
Kim, Moon-Saeng ; Lim, Dong-Wan ; Lee, Joon-Ho ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 88~94
In this study, the dynamic impact analysis for the passenger air-bag(PAB) module has been carried out by using FEM to predict the dynamic characteristics of vehicle ride safety against head impact. The impact performance of vehicle air-bag is directly related to the design parameters of passenger air-bag module assembly, such as the tie bar bracket's width and thickness, respectively, However, the product's design of PAB module parameters are estimated through experimental trial and error according to the designer's experience, generally. Therefore, the dynamic analysis of head impact test of the passenger air-bag module assembly of automobile is needed to construct the analytical methodology At first, the FE models, which are consist of instrument panel, PAB Module, and head part, are combined to the whole module system. Then, impact analysis is carried out by the explicit solution procedure with assembled FE model. And the dynamic characteristics of the head impact are observed to prove the effectiveness of the proposed method by comparing with the experimental results. The better optimized impact performance characteristics is proposed by changing the tie bracket's width md thickness of module. The proposed approach of impact analysis will provides an efficient vehicle to improve the design quality and reduce the design period and cost. The results reported herein will provide a better understanding of the vehicle dynamic characteristics against head impact.
An Exchanging System for an Implant Model between CAD and CAE with a XML Neutral Format
Kim, Jin-Uk ; Chun, Heoung-Jae ; Lee, Soo-Hong ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 95~102
A product is designed through the collaboration among engineers in several fields such as design, analysis, and manufacturing. These series of functions are performed repeatedly during the design process. An easy access and exchange of the model data is one of the important elements that help to shorten production development time. Especially, the importance of data exchange between CAD and CAE applications is increasing in the field of verification and estimation of the products. However, information and knowledge of model which is generated by a CAD software cannot be transferred by a function of CAE software, as an exchange of product data between CAD and CAE applications. It causes a delay in design analysis and eventually discourages a designer's effort in improving his design. Therefore, we need to integrate a commercial CAD and CAE applications effectively and to use the same interface on a product model obtained in a distributed environment. This paper shows how to implement a model exchange between CAD and CAE by a web-service and how to provide a communication environment among engineers.
A Study on the Wedge Angle of the Rail Clamp according to the Change of the Design Wind Speed Criteria
Lee, Jung-Myung ; Han, Dong-Seop ; Lee, Seong-Wook ; Shim, Jae-Joon ; Han, Geun-Jo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 103~110
The rail clamp is very important device to prevent that a container crane slips along a rail due to the wind blast as well as to locate the crane in the set position during an operating mode. Recently, the design wind speed criteria were intensified from the wind speed of 16m/s to 35m/s during an operating mode, and from 50m/s to 75m/s during a stowed mode in Korea, according to the 'Inspection Criteria for Facilities and Equipments in Port' reformed after typhoon 'Maemi'. In order to design the wedge type rail clamp for the reinforced design wind speed criteria of 35m/s, we carried out the finite element analysis of the rail clamp with respect to the wedge angle, and analyzed the relationship between the wedge angle and the sliding distance of the rail clamp.
Micro Electrochemical Machining of Tungsten Carbide
Choi, Se-Hwan ; Chu, Chong-Nam ; Kim, Bo-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 111~116
Micro machining of tungsten carbide by electrochemical machining was studied. In ECM, machining conditions and electrolyte should be chosen carefully according to the property of workpiece materials. In this paper, sulfuric acid and nitric acid were used for tungsten carbide machining and machining characteristics were investigated according to machining conditions such as electrolyte, workpiece potential and applied pulse voltage. By using mixture of sulfuric acid and nitric acid, micro structures with sharp edge and good surface quality were obtained. Micro electrochemical turning was also introduced to fabricate micro shafts.
Development of a Novel Micro-stereolithography Technology using UV Lamp and Optical Fiber
Choi, Ji-Soon ; Lee, Seung-Pyo ; Ko, Tae-Jo ; Lee, In-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 117~121
Generally, micro-stereolithography technology uses laser and complex optical system as light source and light delivery system, respectively. In this research, a novel micro-stereolithography technology that uses UV lamp that is more economical than UV laser as light source and optical fiber that is simpler than previous light delivery system has been developed. Furthermore, precise control system that is composed of 3-axis linear stage and shutter has been used to fabricate truly three dimensional micro-structure. For confirming the feasibility of developed micro-stereolithography apparatus, the solidification experiments were conducted. The solidification widths and depths datum of photopolymer as varying scanning speed of the UV light have been obtained. Using developed apparatus, some micro structures were fabricated successfully.
Manipulation of Carbon Nanotube Tip Using Focused Ion Beam
Yoon, Yeo-Hwan ; Park, June-Ki ; Han, Chang-Soo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 122~127
This paper reports on the development of carbon nanotube tip modified with focused ion beam(FIB). We used an electric field which causes dielectrophoresis, to align and deposit CNTs on a metal-coated canning Probe Microscope (SPM) tip. Using the CNT attached SPM tip, we have obtained an enhanced resolution and wear property compared to that from the bare silicon tip through the scanning of the surface of the bio materials. The carbon nanotube tip was aligned toward the source of the ion beam allowing their orientation to be changed at precise angles. By this technique, metal coated carbon nanotube tips that are several micrometer in length are prepared for SPM.
Two-dimensional Nano-patterning with Immersion Holographic Lithography
Kim, Sang-Won ; Park, Sin-Jeung ; Kang, Shin-Il ; Hahn, Jae-Won ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 12, 2006, Pages 128~134
Two-dimensional nano-patterns are fabricated using immersion holographic lithography. The photoresist layer is exposed to an interference pattern generated by two incident laser beams(
=441.6 nm, He-Cd laser) of which the pitch size is less than 200 nm. Good surface profiles of the 2 dimensional patterns are achieved by trimming the lithography process parameters, such as, exposure time, developing time and refractive index of medium liquid.