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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
Editor in Chief :
Volume & Issues
Volume 22, Issue 12 - Dec 2005
Volume 22, Issue 11 - Nov 2005
Volume 22, Issue 10 - Oct 2005
Volume 22, Issue 9 - Sep 2005
Volume 22, Issue 8 - Aug 2005
Volume 22, Issue 7 - Jul 2005
Volume 22, Issue 6 - Jun 2005
Volume 22, Issue 5 - May 2005
Volume 22, Issue 4 - Apr 2005
Volume 22, Issue 3 - Mar 2005
Volume 22, Issue 2 - Feb 2005
Volume 22, Issue 1 - Jan 2005
Selecting the target year
A Review on Ontology-Based Design Paradigm
Kim Yong Se ; Kang Mujin ; Yang Jungjin ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 7~13
Development of an Integrated Design System Based on Multi-Agent
Lee Jai-Kyung ; Park Seong-Whan ; Lee Jong-Won ; Han Seung-Ho ; Han Hyung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 14~18
Data Mining based Knowledge Management System for Supporting Design Process
Park Hong Seok ; Lee Gyu Bong ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 19~25
Design Repository for Intelligent Design
Kang Mujin ; Kim Jeong-Ki ; Ahn Jin-Cheol ; Eum Kwang-Ho ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 26~31
Improvement of Chip Thickness Model in 2-flutes Slot End Milling
Lee Dong-Kyu ; Lee Ki-Yong ; Lee Kune-Woo ; Oh Won-Zin ; Kim Jeong-Suk ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 32~38
Generally, cutting force models use a sin function method to calculate chip thickness. In slot end milling, the error from a sin function method is much bigger than other machining because a tool rotation angle in cutting is much larger. Thus in this paper, a new method to calculate chip thickness was suggested and evaluated. In a new method, tool position data according to tool rotation are checked and stored so that it is possible correct chip thickness is calculated. Cutting force waveforms simulated from a sin function method and a new method and measured waveforms from experiments were compared and error percentages were obtained. Finally, a new method had good results for simulating cutting force in slot end milling.
Tool Wear in Turning of the Presintered Low Purity Alumina
Lee Jae-Woo ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 39~46
In this study, unsintered, presintered and full-sintered low purity alumina ceramics were machined with various tools to clarify the machinability and the optimum cutting conditions. The main conclusions obtained were as follows. (1) Machined with alloy steel tool, the machinability of the presintered ceramics becomes better with the decrease of presintering temperature, but that of unsintered ceramics(white body) was extremely poor. (2) In the case of carbide, K01, the tool life in machining the white body was the longest, and the machinability of presintered ceramics becomes poorer with the increase of the presintering temperature. (3) The K01 tools exhibit longer life than the P10 tools in machining both the white body and the ceramics presintered at
or higher temperatures, but the P10 tools shows longer tool life than the K10 tools in machining of the ceramics presintered at temperatures below
Experimental Study on Effect of TiN - Coating on a Cold Forging in Surface Characteristics
Kim Hae Ji ; Lee Sang Wook ; Kang Sang Myoung ; Joun Byung Yun ; Joun Man Soo ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 47~52
In this paper, the effect of TiN-coating on product quality such as dimensional accuracy and surface roughness is experimentally investigated. A punch of SKD11 material in cold forging an automotive bearing shaft and its related process found in a cold forging company are selected as the test example. The effect of TiN-coating is revealed in a quantitative manner. It is to be noted that TiN-coating is effective in controlling the dimensional accuracy and surface roughness as well as in increasing tool lift.
Development of Real-time Remote Detection System for Crane Wire Rope Defect
Lee Kwon Soon ; Suh Jin Ho ; Min Jeong Tak ; Lee Young Jin ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 53~60
The wire rope of container crane is a important component to container transfer system and is used in a myriad of various applications such as elevator, mine hoist, construction machinery, and so on. If it happen wire rope failures in operating, it may lead to the safety accident and economic loss, which is productivity decline, competitive decline of container terminal, etc. To solve this problem, we developed the active and portable wire rope fault detecting system. The developed system consists of three parts that are the fault detecting, signal processing, and remote monitoring part. All detected signal has external noise or disturbance according to circumstances. Therefore we applied to discrete wavelet transform to extract a signal from noisy data that was used filter. As experimental result, we can reduce the expense for container terminal because of extension of exchange period of wire rope for container crane and this system is possible to apply in several fields to use wire rope.
An Automatic Travel Control of a Container Crane using Neural Network Predictive PID Control Technique
Suh Jin Ho ; Lee Jin Woo ; Lee Young Jin ; Lee Kwon Soon ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 61~72
In this paper, we develop anti-sway control in proposed techniques for an ATC system. The developed algorithm is to build the optimal path of container motion and to calculate an anti-collision path for collision avoidance in its movement to the finial coordinate. Moreover, in order to show the effectiveness in this research, we compared NNP PID controller to be tuning parameters of controller using NN with 2 DOF PID controller. The experimental results for an ATC simulator show that the proposed control scheme guarantees performances, trolley position, sway angle, and settling time in NNP PID controller than other controller. As a result, the application of NNP PID controller is analyzed to have robustness about disturbance which is wind of fixed pattern in the yard. Accordingly, the proposed algorithm in this study can be readily used for industrial applications
Test and Evaluation of a Newly Built Multi-purpose Transmission Type Polariscope
Baek Tae Hyun ; Kim Myung Soo ; Lee Choon Tae ; Kim Whan ; Park Tae Guen ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 73~81
A multi-purpose polariscope is developed by applying an electro-mechanical control system to a diffused transmission-type circular polariscope. A conventional polariscope is only good for manual control of optical elements. The new polariscope system is devised to be controlled through two stepping motors and two magnetic clutches. The developed system has both functions of a conventional linear- and circular-polariscope. The new polariscope can be used not only for the point-wise measurement using Tardy compensation technique but also for the full-field fringe analysis using conventional and/or phase measuring techniques, if applicable.
Development of the Container Damage Inspection System
Oh Jae Ho ; Hong Seong Woo ; Choi Gyu Jong ; Kim Myong Ho ; Ahn Doo Sung ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 82~88
The damage inspection of container surface is performed by the expert inspectors at the container terminal gate of harbor. In this paper, we substitute the expert's capability with the damage inspection system using the artificial intelligent control algorithm and vision system, so we can improve the work environment and effectively decrease the inspection time and cost. Firstly, using six CCD cameras attached to the terminal gate, whole container is partially captured according to eleven sensors aligned with the entering direction of container. Captured partial images are inspected by the fuzzy system which the expert's technology is embedded. Next, we compose partial images to be a complete container image through the correlation coefficient method. Complete container image is saved to solve future troublesome problems. In this paper, the effectiveness of the proposed system was verified through the field test.
A Stability Analysis of a Biped Walking Robot about Balancing Weight
Noh Kyung-Kon ; Kim Jin-Geol ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 89~96
This paper is concerned with a balancing motion formulation and control of the ZMP (Zero Moment Point) for a biped-walking robot that has a prismatic balancing weight or a revolute balancing weight. The dynamic stability equation of a walking robot which have a prismatic balancing weight is conditionally linear but a walking robot's stability equation with a revolute balancing weight is nonlinear. For a stable gait, stabilization equations of a biped-walking robot are modeled as non-homogeneous second order differential equations for each balancing weight type, and a trajectory of balancing weight can be directly calculated with the FDM (Finite Difference Method) solution of the linearized differential equation. In this paper, the 3dimensional graphic simulator is developed to get and calculate the desired ZMP and the actual ZMP. The operating program is developed for a real biped-walking robot IWRⅢ. Walking of 4 steps will be simulated and experimented with a real biped-walking robot. This balancing system will be applied to a biped humanoid robot, which consist legs and upper body, as a future work.
A Study on Induction Heating with Forced Surface Cooling in Semi-Solid Forming Process
Park Joon Hong ; Choi Young ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 97~102
The procedure of semi-solid forming is composed of heating a billet, forming, compression holding and ejecting step. There are several methods to heat a billet during semi-solid forming process such as electric heating and induction heating. Usually in semi-solid forming process, induction heating has been adopted to achieve more uniform temperature of semi-solid material. Although induction heating is better method than any others, however, there is still difference of temperature between internal part and surface part of semi-solid material. Worse yet, in case of high liquid fraction of semi-solid material, liquid of the billet will flow down though solid of the billet still remains, which is very difficult to handle. In the present study, induction heating of semi-solid material with compulsive surface cooling has been performed to obtain uniform distribution of temperature. Distribution of temperature of the billets was measured and compared with that of conventional distribution of temperature. By this new induction heating method, not only temperature over the whole billet become uniform, but also control of temperature is possible.
A Study on the Development of Shoe Outsole Mold for Flash-less
Hur Kwan Do ; Yeo Hong Tae ; Choi Young ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 103~108
In this study, to develop a flash-less mold for forming of shoe-outsole, experiments and forming analysis were carried out. In order to reduce the extra-materials, offset method and mass distribution method are used in the preform design. The vertical mold structure pressing the preform was introduced to produce a flash-less shoe-sole. To measure the contact status of parting surface of mold, the pressure film has been used. The guide-gutter system and the continuous pressing mold have been developed for the discharge of extra-materials and re-pressing. By the investigation, flash of shoe-outsole was considerably reduced.
A Study on the Development of Shoe Midsole Mold for Flash-less
Hur Kwan Do ; Yeo Hong Tae ; Choi Young ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 109~114
In this study, to develop a flash-less mold for forming of shoe-midsole, experiments and forming analysis were carried out. In order to reduce the extra-materials, the final preform has been modified by the experiment of pressure forming at the room temperature. To measure the contact status of parting surface of mold, the pressure film has been used. The midsole mold of the wedge structure type has been developed for the improvement of the contact status. The vertical pressing mold structure was introduced for the production of a flash-less midsole. By the investigation, flash of shoe-midsole was considerably reduced.
FEA Simulation for Practical Behaviors of Electrostatic Micro Actuator
Lee Yang Chang ; Lee Joon Seong ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 115~121
Micromachines are extremely novel artifacts with a variety of special characteristics. Utilizing their tiny dimensions ranging roughly from 10 to
micro-meters, the micromachines can perform tasks in a revolutionary manner that would be impossible for conventional artifacts. Micromachines are in general related to various coupled physical phenomena. They are required to be evaluated and designed considering the coupled phenomena. This paper describes finite element analysis (FEA) simulation of practical behaviors for the micro actuator. Especially, electric field modeling in micro actuators has been generally restricted to in-plane two-dimensional finite element analysis because of the complexity of the micro actuator geometry. However, in this paper, the actual three-dimensional geometry of the micro actuator is considered. The starting torque obtained from the in-plane two-dimensional analytical solutions were compared with that of the actual three-dimensional FE analysis results. The starting torque is proportional to
, and that the two-dimensional analytical solutions are larger than the three- dimensional FE ones. It is found that the evaluation of micro actuator has to be considered electrical leakage phenomenon.
Parallel Processing of 3D Rigid-Plastic FEM on a Cluster System
Choi Young ; Seo Yongwie ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 122~129
On the cluster system, the parallel code of rigid-plastic FEM has been developed. The cluster system, Simforge, has 15 processors and the total memory is 4.5GBytes. In the developed parallel code, the distributed data of the column-wise partitioned stiffness are stored as the compressed row storage and the diagonal preconditioned conjugate gradient solver is applied. The analysis of block upsetting is performed with the parallel code on Simforge cluster system. In this paper, the analysis results are compared and discussed.
The Effect of Structure on Torsional Fatigue Strength of Surface Hardened Carbon Steel
Ko Jun Bin ; Kim Woo Kang ; Won Jong Ho ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 130~136
Induction hardening increases hardness near the surface where it's most needed, and leaves the surface in compression which improves fatigue life. Although case depth and chemical composition are same, the structure of induction hardened shaft affects the fatigue strength and life because of austenization during hardening. Therefore torsional fatigue tests of specimens from various structures, which are obtained by nomalizing, spheriodized annealing and tempering after quenching, were conducted on induction hardened automotive drive shafts with various case depths and loads applied in order to evalute the relation between structure and fatigue strength.
The Effects of the GAIM Process Variables on the Penetration-Length Variations in a Unary Branch Type Runner Mold
Han Seong Ryul ; Park Tae Won ; Jeong Yeong Deug ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 137~142
Gas-Assisted Injection Molding(GAIM) is an innovative technology for producing plastic parts and has been received extensive attention in the plastic manufacturing industries. But, due to gas-polymer interacting during the gas injection phase, the process has significantly different characteristics from conventional injection molding and, therefore, the control of the process requires much technical knowledge in processing and materials. The experiment was performed about variations of gas-penetration length that is affected by filling imbalance resulting from the structure of runner. The Taguchi method was used for the design of experiment. The most effective factors for the gas-penetration length were the shot size and mold temperature. The most effective factors for the difference of the gas-penetration length were the melt temperature and shot size. This study also discussed the filling imbalance phenomenon in a unary branch runner type mold that has geometrically balanced runner.
Dynamic Behavior of Timoshenko Beam with Crack and Moving Mass
Yoon Han Ik ; Choi Chang Soo ; Son In Soo ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 143~151
This paper study the effect of open cracks on the dynamic behavior of simply supported Timoshenko beam with a moving mass. The influences of the depth and the position of the crack in the beam have been studied on the dynamic behavior of the simply supported beam system by numerical method. Using Lagrange's equation derives the equation of motion. The crack section is represented by a local flexibility matrix connecting two undamaged beam segments i.e. the crack is modeled as a rotational spring. This flexibility matrix defines the relationship between the displacements and forces on the crack section and is derived by the applying fundamental fracture mechanics theory. As the depth of the crack is increased the mid-span deflection of the Timoshenko beam with the moving mass is increased. And the effects of depth and position of crack on dynamic behavior of simply supported beam with moving mass are discussed.
Dynamic Analysis of a Pantograph-Catenary System for High-Speed Train(I. Modeling and Analysis of a Catenary System)
Seo Jong-Hwi ; Jung Il-Ho ; Park Tae-Won ; Mok Jin-Yong ; Kim Young-Guk ; Kim Seok-Won ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 152~159
The dynamic properties between catenary and pantograph of high-speed train are very important factors to affect the stable electric power supply. So as to design the reliable current collection system, a multibody simulation model is needed. In this paper, the dynamic analysis method for a pantograph-catenary cable system of high-speed train is presented. The very deformable motion of a catenary cable is demonstrated using nonlinear continuous beam theory, which is based on an absolute nodal coordinate formulation, and the pantograph is modeled as a rigid multibody. The proposed method might be very efficient, because this method can present the nonlinear properties of a flexible catenary cable and set a various boundary conditions.
Dynamic Analysis of a Pantograph-Catenary System for High-Speed Train(II. Analysis of the Integrated Current Collection System)
Seo Jong-Hwi ; Mok Jin-Yong ; Jung Il-Ho ; Park Tae-Won ; Kim Young-Guk ; Kim Seok-Won ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 160~166
In this paper, the combined system equation of motion, which can analyze the dynamic interaction between pantograph and catenary system, is derived by adopting absolute nodal coordinates and rigid body coordinates. The analysis results are compared with real experiment data from test running of Korean high-speed train (HSR 350x). In addition, a computation method for the dynamic stress of contact wire is presented using the derived system equation of motion. This method might be good example and significant in that the structural and multibody dynamics model can be unified into one numerical system.
Design of Backward Extrusion Die by using Flexible Tolerance Method and Response Surface Methodology
Hur Kwan Do ; Yeo Hong Tae ; Choi Young ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 167~174
The design for cold extrusion dies is very important, because the die insert is subjected to very high radial and hoop stresses. The design of cold extrusion dies has many constrained conditions. In this paper, the used assumptions are such that the yield strength of each ring is selected according to the allowable tensile or compressive hoop stress in each ring and the maximum allowable inner pressure, when yielding occurs in one ring of the dies, is obtained by the proposed equation. In order to obtain design variables, such as diameter ratios and interferences, using the maximum inner pressure, the flexible tolerance method was used for shrink-fitted thick-walled cylinders. ANSYS APDL was used to perform the repeated analysis of deformation of the dies due to the variation of the design variables. The response surface methodology is utilized to analyze the relationship between the design variables and the maximum radial displacement of the die insert during extrusion. From the results, it is found that outer diameter of the die insert has the largest effect on the minimization of maximum radial displacement at the inner surface of the dies.
Fabrication of Precise Patterns using a Laser Beam Expanding Technique in Nano-Replication Printing (nRP) Process
Park Sang Hu ; Lim Tae Woo ; Yang Dong-Yol ; Yi Shin Wook ; Kong Hong Jin ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 175~182
A laser beam expanding technique is employed to fabricate precise nano-patterns in a nano-replication printing (nRP) process. In the nRP process, some patterns can be fabricated in the range of several microns inside on a polymerizable resin by using a volume-pixel (voxel) matrix that is transformed from a two-tone bitmap figure file. The liquid monomers are polymerized by means of a two-photon-absorption (TPA) phenomenon that is induced by a femtosecond (fs)-pulse laser. The yokels are generated consecutively to merge into adjoining yokels in the process of fabricating a pattern. The resolution of a fabricated pattern can be obtained under the diffraction limit of a laser beam by the two-photon absorbed polymerization (TPP). In this work, a beam-expanding technique has been applied to enlarge a working area and to fabricate precise patterns. Through this work, a working area is expanded by the technique as much as 2.5 times compared with a case of without a beam expanding technique, and precision of outside patterns is improved.
Cerebrum Lateralization by Area based on the Intensity of BOLD Signal during Cognitive Performance
Chung Soon Cheol ; Shon Jin Hun ; Kim Ik Hyeon ; Lee Soo Yeol ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 183~192
This study compared cerebral lateralization index based on the area of neural activation with that based on the intensity of neural activation. For this purpose, 8 right-handed male college students (the mean age - 23.5 years) and 10 right-handed male college students (the mean age - 25.1 years) participated respectively in researches on visuospatial and verbal task brain function. Functional brain images were taken from 3T MRI using the single-shot EPI method. The result of measuring cerebral lateralization index based on the area of neural activation suggested that the right hemisphere is dominant in visuospatial tasks and the left one is in verbal tasks. However, the dominance is not sufficient to locate the exact part of the brain for these tasks. When cerebral lateralization index was computed based on the intensity of neural activation, it was derived that the area of cerebral lateralization closely related to visuospatial tasks is the superior parietal lobe, and the area of cerebral lateralization closely related to verbal tasks is the inferior and middle frontal lobes. Thus, cerebral lateralization index by area based on the intensity of neural activation as proposed by this study can determine the dominance of the cerebrum by area, so is helpful for accurate and quantitative determination of cerebral lateralization.
Visuospatial Cognitive Performance, Hyperoxia and Heart Rate due to Oxygen Administration
Chung Soon Cheol ; Shon Jin Hun ; Lee Bongsoo ; Lee Soo Yeol ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 193~198
Changes in visuospatial cognitive performance, blood oxygen saturation and heart rate due to the highly concentrated oxygen administration were observed in this study. Six male (
1.0) and six female ((
1.9) adults were asked to perform 20 visuospatial tasks with the same level of difficulties by supplying two different oxygen levels (21%, 30%). Experiment consisted of Rest1 (1 min.), Control (1 min.), Task (4 min.), and Rest2 (4 min.) and physiological signals such as blood oxygen saturation and heart rate were measured through each stage. The result showed the accuracy of task performance increased significantly at 30% oxygen concentration compared with 21%, which means oxygen supply has positive effects on visuospatial cognitive performance. When 30% oxygen was supplied, blood oxygen saturation during control and task phases was increased and heart rate was decreased compared with 21%. It means that 30% oxygen can stimulate brain activities by directly increasing the actual level of blood oxygen concentration during cognitive performance, and enough oxygen supply during cognitive performance make heart rate decrease.
A Study on the Polymer Lithography using Stereolithography
Jung Young Dae ; Lee Hyun Seop ; Son Jae Hyuk ; Cho In Ho ; Jeong Hae Do ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 1, 2005, Pages 199~206
Mask manufacturing is a high COC and COO process in developing of semiconductor devices because of mask production tool with high resolution. Direct writing has been thought to be the one of the patterning method to cope with development or small-lot production of the device. This study consists two categories. One is the additional process of the direct and maskless patterning generation using SLA for easy and convenient application and the other is a removal process using wet-etching process. In this study, cured status of epoxy pattern is most important parameter because of the beer-lambert law according to the diffusion of UV light. In order to improve the contact force between patterns and substrate, prime process was performed and to remove the semi-cured resin which makes a bad effects to the pattern, spin cleaning process using TPM was also performed. At a removal process, contact force between photo-curable resin as an etching mask and Si wafer is important parameter.