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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 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
Development of Dithering Process for Accuracy of Microstructure by Projection Microstereolithgraphy based on UV-DMD
Park, In-Baek ; Ha, Young-Myung ; Kim, Min-Sub ; Lee, Seok-Hee ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 7~13
Development of Moulds and Dies Using Direct Metal Rapid Tooling & Manufacturing Technologies
Ahn, Dong-Gyu ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 14~23
A Method of 3D Metal Powder Manufacturing using UV Curing Process
Kim, Jung-Su ; Kim, Dong-Soo ; Lee, Min-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 24~28
An Experimental Study on Mechanical Characteristics along a Laser Scan Path in the SLS Process
Bae, Sung-Woo ; Kim, Dong-Soo ; Choi, Kyung-Hyun ; Yoo, Seong-Yeon ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 29~34
Recent Trends of Nano-stereolithography Process for Fabrication of 3D Nano/micro Structures and Its Applications
Yang, Dong-Yol ; Lim, Yae-Woo ; Son, Yong ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 35~46
ED-drilling of WC-Co to Minimize Electrolytic Corrosion on a Workpiece Surface
Song, Ki-Young ; Chung, Do-Kwan ; Park, Min-Soo ; Chu, Chong-Nam ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 47~54
In this study, a simple and effective method was proposed to minimize electrolytic corrosion on the workpiece during ED-drilling using water as a working fluid. The adhesion of a cover plate onto the surface of the workpiece was greatly effective for suppressing electrolytic corrosion during ED-drilling. The experiment revealed that the adhesion of the cover plate prevented corrosion without causing significant changes in machining characteristics. Using the machining method proposed in this paper, electrolytic-corrosion-free holes can be machined without change in the machinery system. By using corrosion-free hole as a start hole for wire EDM, a lead frame die with high quality was fabricated successfully.
An Experimental Study on the Determination of Efficient Superfinishing Conditions Using Polishing Film
Jung, Sung-Yong ; Park, Ki-Beom ; Jung, Yoon-Gyo ; Jung, Soo-Yong ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 55~61
Recently, many studies are being conducted to realize high quality polishing technology, but because of high dependence on field experience and insufficient research for ultra-precision polishing technology, it is difficult to establish standardization of polishing conditions. The purpose of this study is to determine high-efficiency superfinishing conditions which are applicable in the field of machining. To achieve this, we have a developed a superfinishing device and conducted a series of polishing experiments for mechanical materials such as SM45C, Brass, Al7075, and Ti, from the perspective of oscillation speed, the rotational speed of the workpiece, contact roller hardness, contact pressure, and feed rate. From the experimental results, it was confirmed that the polishable superfinishing conditions range and efficient feed rate of polishing film can be determined.
An Enhancement of Ultrasonic Based Map-building Using Newton Interpolation
Choi, Kyung-Sik ; Choi, Jung-Won ; Lee, Suk-Gyu ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 62~71
In mobile robotics, ultrasonic sensors became one of the most popular devices for collision avoidance and navigation primarily due to data robustness, the easy availability of low-cost systems, their compact size, simple circuits, and their ease in interfacing with computers. However, ultrasonic sonic sensors are subject to noise which results in inaccuracy of mapping and localization of the robot. This paper introduces a new approach to enhance environmental maps based on ultrasonic range data using linear interpolation and Newton interpolation. The simulation and experimental results show that the proposed method improves of the accuracy of the map through better distance estimation between the mobile robot and obstacles.
Development of Line Standards Measurement System Using an Optical Microscope
Kim, Jong-Ahn ; Kim, Jae-Wan ; Kang, Chu-Shik ; Eom, Tae-Bong ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 72~78
We developed a line standards measurement system using an optical microscope and measured two kinds of line standards. It consists of three main parts: an optical microscope module including a CCD camera, a stage system with a linear encoder, and a measurement program for a microscopic image processing. The magnification of microscope part was calibrated using one-dimensional gratings and the angular motion of stage was measured to estimate the Abbe error. The threshold level in line width measurement was determined by comparing with certified values of a line width reference specimen, and its validity was proved through the measurement of another line width specimen. The expanded uncertainty (k=2) was about 100 nm in the measurements of
line width. In the comparison results of line spacing measurement, two kinds of values were coincide within the expanded uncertainty, which were obtained by the one-dimensional measuring machine in KRISS and the line standards measurement system. The expanded uncertainty (k=2) in the line spacing measurement was estimated as
. Therefore, it will be applied effectively to the calibration of line standards, such as line width and line spacing, with the expanded uncertainty of several hundreds nanometer.
Stiffness Analysis of a Low-DOF Planar Parallel Manipulator
Kim, Han-Sung ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 79~88
This paper presents the analytical stiffness analysis method for a low-DOF planar parallel manipulator. An n-DOF (n<3) planar parallel manipulator to which 1- or 2-DOF serial mechanism is connected in series may be used as a positioning device in planar tasks requring high payload and high speed. Differently from a 3-DOF planar parallel manipulator, an n-DOF planar parallel counterpart may be subject to constraint forces as well as actuation forces. Using the theory of reciprocal screws, the planar stiffness is modeled such that the moving platform is supported by three springs related to the reciprocal screws of actuations (n) and constraints (3-n). Then, the spring constants can be precisely determined by modeling the compliances of joints and links in serial chains. Finally, the stiffness of two kinds of 2-DOF planar parallel manipulators with simple and complex springs is analyzed. In order to show the effectiveness of the suggested method, the results of analytical stiffness analysis are compared to those of numerical stiffness analysis by using ADAMS.
The Navigation Algorithm of Mobile Robot based on Passive RFID Tag
Ji, Yong-Kwan ; Park, Jahng-Hyon ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 89~95
In this paper, a navigation algorithm is proposed using RFID tags in indoor environments. Firstly, a stochastic sensor model of RFID is derived and the design factors including the maximum identifiable distance, the identification direction and the read success rate are obtained through experiments. The obstacle avoidance algorithm is developed with consideration of those factors for a variety of RFID antenna configurations and different indoor environments. The algorithm is tested by computer simulations and implemented on a mobile robot.
Finite Element Analysis for Precision Roll Forming Process of Stainless Slide Rail
Lee, Taek-Sung ; Kim, Gun-Wan ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 96~103
The roll forming process is commonly used for the conventional 'Fe' metal products such as a furniture drawer guide or an up-down slide guide. Recently its applications are variously expanded to the sanitary facilities or electronic devices. It is essentially required the cleanness for the high technology application and any corrosion or rust are not allowed. Therefore, in those applications the stainless steel materials are strongly demanded as the substitution of 'Fe' steel. However the mechanical properties of stainless steel are not suitable for forming process compared with those of 'Fe' steel. Up to now, the conventional F.E.M.(Finite Element Method) has been used to analyze and design the roll forming process. The purpose of this research is to obtain the proper production process and the shape of rolls to manufacture the high precision slide rails made of stainless steel material. The commercial program, SHARPE-RF, is used to analyze the entire roll forming process. The results show that the rolling process and the roll design by F.E.M. are useful from the good agreement between the shapes of products estimated by F.E.M. and those of the actual products.
A Study on the Development of the Gear Profile Design Program
Jung, Sung-Pil ; Park, Tae-Won ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 104~111
In this paper, the gear design program is presented. The profile of gears is created using classical mathematic formulations. In each gear, a kinematic joint is applied and one can define the 20 contact condition between gear pairs. Initial and boundary conditions such as force, torque, velocity, acceleration, etc. can be set. Thus, it is possible to analyze dynamic characteristics of gear pairs such as reaction moment and the variation of angular velocity. In order to find the optimal profile of gear pairs, two optimization methods based on design of experiments are inserted in the program; One is the Taguchi method and the other is the response surface analysis method. To verify the program, the rack & pinion gear is created and analyzed. Simulation results show that the developed program is useful and result data is reliable.
Analysis on the Pressure Rise Characteristics Caused by Movement of Linear and Rotary Stages using Air Bearings in High Vacuum Environment
Kim, Gyung-Ho ; Park, Chun-Hong ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 112~118
A pressure rise is generated while air bearing stages are moving in high vacuum environment. This study analyzed this pressure rise phenomenon theoretically and verified it experimentally using two different kinds of stages - linear and rotary air bearing stages. Results indicate that the pressure rise was caused by additional leakage resulting from stage velocity, along with adsorption and outgassing of gas molecules from the guide rail surface. Though tilting of the stage due to acceleration and deceleration reached several micrometers, it had a negligible effect on pressure rise because the tilting time was very short. Therefore, a rotary air bearing stage showed much less pressure rise than a linear stage because the rotary stage theoretically has nothing to do with the above causes. Additional leakage caused by stage velocity was inevitable if the stage had movements, but pressure rise caused by adsorption and outgassing could be suppressed by improving the surface quality to reduce real surface area, and by coating the guide rail surface with titanium nitride (TiN) which has less adhesion probability of gas molecules. The results also indicate that the pressure rise increased when the air bearing stage operated under high vacuum conditions.
Fabrication of 3D Metallic Molds for Multi-replication of Microstructures
Bae, Kong-Myung ; Ko, Jong-Soo ; Park, Sang-Hu ; Lim, Tae-Woo ; Yang, Dong-Yol ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 119~125
Fabrication of a three-dimensional (3D) metallic mold for multi-production of a microstructure was studied to settle the problem of long processing time in 3D microfabrication. To date, complicated 3D microstructures including 3D photonic crystals, 3D microlens array, 3D filter for microfludics, and something else were created successfully using the two-photon polymerization (TPP) which was considered as paving the way to fabricate a real 3D shape in nano/microscale. However, for those fabrications, much processing time and efforts were inevitably required. To solve this issue, a simple and effective way was proposed in this paper; 3D master patterns were prepared using TPP, and then counter-shaped Ni molds were fabricated by electroforming process. By using these molds, 3D microstructures can be reproduced with short-processing time and low-effort comparing to the conventional approach, TPP We report some parameters to fabricate a metallic mold precisely.
Three-dimensional CT based Quantitative Assessment of Normal and Dysplasia Acetabulum
An, Eun-Soo ; Lee, Soon-Hyuck ; Park, Sang-Won ; Park, Jong-Hoon ; Suh, Dong-Hun ; Noh, Won ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 126~131
Acetabular dysplasia is a condition defined by inadequate development of an individual's acetabulum. Individual diversity of the symptoms in this disease needs safe and accurate preoperative planning. Technologies that utilize multidimensional image information are thus important. The assessment method by Janzen et al. was suggested a coefficient method in evaluation of acetabular dysplasia. In this study, we applied it, using a three-dimensional computed tomography (3D CT) on the koreans. 19 cases of the normal hips and 4 cases of the acetabular dysplasia were investigated to evaluate the proved method; 3D CT was used to define the geometric center of the femoral head and to measure center edge angles at
rotational increments around the acetabular rim. Mean and standard deviation in CEAs (Center Edge Angle) of normal 19 hips at
rotational increments from anterior to posterior rim were determined, and termed as a 'normal curve'. Then this normal values were compared with the CEA data measured from 4 cases of acetabular dysplasia patiens. Quantative comparison of the CEA values between the normal cases and dysplasia cases was successfully demonstrated, and thus, we claim that this simple CT method of assessing acetabular dysplasia can be well applicable to diagnosis, quantification and surgical planning for adult acetabular dysplasia patients.
EMG-based Real-time Finger Force Estimation for Human-Machine Interaction
Choi, Chang-Mok ; Shin, Mi-Hye ; Kwon, Sun-Cheol ; Kim, Jung ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 132~141
In this paper, we describe finger force estimation from surface electromyogram (sEMG) data for intuitive and delicate force control of robotic devices such as exoskeletons and robotic prostheses. Four myoelectric sites on the skin were found to offer favorable sEMG recording conditions. An artificial neural network (ANN) was implemented to map the sEMG to the force, and its structure was optimized to avoid both under- and over-fitting problems. The resulting network was tested using recorded sEMG signals from the selected myoelectric sites of three subjects in real-time. In addition, we discussed performance of force estimation results related to the length of the muscles. This work may prove useful in relaying natural and delicate commands to artificial devices that may be attached to the human body or deployed remotely.
Enhancement and Evaluation of Fatigue Resistance for Spine Fixation System
Kim, Hyun-Mook ; Kim, Sung-Kon ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 8, 2009, Pages 142~147
Spinal fixation systems provide surgical versatility, but the complexity of their design reduces their strength and fatigue resistance. There is no published data on the mechanical properties of such screws. Screws were assembled according to a vertebrectomy model for destructive mechanical testing. A group of two assemblies was tested in static compression. One group was applied to surface a grit blasting method and another group was applied to surface a bead blasting method. Modes of failure, yield, and ultimate strength, yield stiffness, and cycles to failure were determined for six assembles. Static compression 2% offset yield load ranges was from 327 to 419N. Fatigue loads were determined two levels, 37.5% and 50% of the average load from static compression ultimate load. An assembly of bead blasting treatment only achieved 5 million cycles at 37.5% level in compression bending.