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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
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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
A Study on Development of performance Metrics for Autonomous Cleaning Robot
Ryu Jae-Chang ; Park Kwang-Ho ; Lee Soon-Geul ; Rhim Sung-Soo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 7~13
Database Research of Standard Modeling Environment for Virtual Test of Autonomy Robot according to each Module and Basic Elements
Jung Eun-Kyo ; Choi Jin-Hwan ; Lee Soon-Geul ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 14~23
Fuzzy Logic Control ofa Biped Robot Using Adaptive Backstepping Method
Hwang Jae-Pil ; Joo Jung-Ho ; Kim Eun-Tai ; Lee Hee-Jin ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 24~29
Influence of process Parameters on the Surface Roughness and the Striation Formation of the Cut Section for the Case of Cutting of CSP 1N Sheet using High Power CW Nd:YAG Laser
Ahn Dong-Gyu ; Kim Min-Su ; Park Hyung-Jun ; Yoo Young-Tae ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 30~38
Laser cutting technology is one of flexible rapid manufacturing technologies with various advantageous including a high cutting speed, manufacturing of parts with a complex shape and others. The quality of the cut part and the optimum cutting conditions are highly dependent on the combination of the process parameters. The objective of this research works is to investigate the influence of process parameters, such as power of laser, cutting speed of laser and material thickness, on the surface roughness and the striation formation of the cut section for the case of cutting of CSP 1N sheet using high power Nd:YAG Laser with a continuous wave (CW). In order to find the relationship between process parameters and the surface roughness and the striation formation of the cut section, several experiments are carried out. Through the investigation of the empirical results, it has been shown that the surface roughness is highly related to the striation formation, including the frequency and angle of the striation, of the cut section. From the results of experiments, an optimum cutting speed for each cutting condition has been obtained to improve both the quality of the cut surface and the cutting efficiency.
Characteristics Induction and Laser Surface hardening of SM45C Steel
Na Gee-Dae ; Shin Ho-Jun ; Shin Byung-Heon ; Yoo Young-Tae ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 39~50
Laser heat treatment technologies have been used to improve characteristics of wear and to enhance the fatigue resistance for automotive parts. The bjective of this research work is to investigate the influence of the process parameters, such as power of laser and defocused spot position, on the characteristics of laser heat treatment for the case of SM45C medium carbon steel. CW Nd:YAG laser is selected as the heat source. The optical lens with the elliptical profile is designed to obtain a wide heat treatment area with a uniform hardness. From the results of the experiments, it has been shown that the maximum hardness is approximatly 780 Hv when the power and the travel of laser are 1,095 W and 0.6 m/min, respectively. In addition, the hardening width using the elliptical lens was three time larger than that using the defocusing of laser beam.
An Uncertainty Analysis of a Compensation Method for the Positioning Error of Three-DOF Manipulator
Park Jae-Jun ; Eom Hyung-Wook ; Cho Nahm-Gyoo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 51~58
This study analyzes the uncertainty of the compensation method of a sensing error of three-DOF measuring system. This compensation method utilizes a reference coordinate system using a three point by moving a position of an endpoint of a three-DOF manipulator. The coordinate transformation between the three-DOF manipulator and the measuring system is identified by the reference coordinate system. According to the concept of this compensation method, each positioning error at any position of the end-point of the manipulator is derived. Uncertainty analyses of the compensation values on the basis of sensitivity analysis and Monte Carlo simulation are used to investigate a feasibility and effectiveness of the compensation method.
Development of Intelligent Filler Wire Feeding Device for Improvement of Weld quality
Lee Jae-Seok ; Sohn Young-Il ; Park Ki-Young ; Lee Kyoung-Don ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 59~66
In laser welding, automatic seam tracking is important to adjust the laser head position in real time as it moves along the seam. Also if the joint gap is occurred, filling the missing material into the joint gap is necessary to prevent welding defects and bad welding quality. In general, the joint gap width is not constant along the seam due to a variety of reason. So it is essential to control the filler wire speed into the joint gap to acquire good welding quality. This paper describes an intelligent filler wire feeding device which can control 3-dimensional seam tracking and the filler wire speed by measuring the gap position and the joint gap width in laser welding. We call this device as Smart Micro Control system(SMC). To achieve this objective, we assessed weld quality in 2mm sheets of A16061 which had various gap width by using the developed device. From the experimental results, It was found the possibility that the developed device could be used in welding various 3-dimensional structures.
A Study on Characteristics of Inter-Articular Coordination of Human Fingers for Robotic Hands
Kim Byoung-Ho ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 67~75
One of challenging topics for humanoid hands is to modulate a human-like motion of humanoid fingers handling an object. To this end, recognizing the motion behavior of human fingers is very important aspect. Based on this concept, this paper identifies the .joint trajectories of human fingers for an operation of hand opening and closing, and specifies an empirical model that coordinates an inter-articular relationship of human fingers doing the given motion. It is expected that the inter-articular model presented in this paper is applicable for humanoid fingers to mimic the natural motion of human fingers.
Development of a New Buffing Robot Manipulator for Shoes
Hwang Gyu-Deuk ; Cho Sung-Duk ; Choi Hyeung-Sik ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 76~83
In this paper, an analysis on a new robot manipulator developed for the side buffing of the shoes is presented. The robot manipulator is composed of five degrees of freedom. An analysis on the forward and inverse kinematics was performed. Through the analysis, an analytic solution was derived for the joint angles corresponding to the position and orientation of the tool in the Cartesian coordinates. The hardware system of the robot composed of the control system, input/output interface system, and related electronic system was developed. The communication system was also developed to interact the robot with the related surrounding systems. A graphic user interface(GUI) program including the forward/inverse kinematics, control algorithm, and communication program was developed using visual C++ language.
Motion Study for a Humanoid Robot Using Genetic Algorithm
Kong Jung-Shik ; Lee Bo-Hee ; Kim Jin-Geol ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 84~92
This paper deals with determination of motions of a humanoid robot using genetic algorithm. A humanoid robot has some problems of the structural instability basically. So, we have to consider the stable walking gait in gait planning. Besides, it is important to make the smoothly optimal gait for saving the electric power. A mobile robot has battery to move autonomously. But a humanoid robot needs more electric power in order to drive many joints. So, if movements of walking joint don't maintain optimally, it is hard to sustain the battery power during the working period. Also, if a gait trajectory doesn't have optimal state, the expected lift span of joints tends to be decreased. Also, if a gait trajectory doesn't have optimal state, the expected lift span of joints tends to be decreased. To solve these problems, the genetic algorithm is employed to guarantee the optimal gait trajectory. The fitness functions in a genetic algorithm are introduced to find out optimal trajectory, which enables the robot to have the less reduced jerk of joints and get smooth movement. With these all process accomplished by PC-based program, the optimal solution could be obtained from the simulation. In addition, we discuss the design consideration fur the joint motion and distributed computation of tile humanoid, ISHURO, and suggest its result such as structure of the network and a disturbance observer.
Systemization of a Remanufacturing Process and its General Guidelines with a Case Study of Automobile Alternators
Kim Hyung-Ju ; Ryu Shi-Bok ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 93~100
Post industrial technologies have improved human standard of living, however, a host of negative environmental consequences from the unlimited industrial appetite have posed serious global challenges. Remanufacturing is an industrial manufacturing process that is to restore old products to perform like a new and to save energy, natural resources, landfill space and to reduce air pollution by less re-smelting. By extending product lift cycle, remanufacturing gives us enormous opportunities for sustainable development of our society. This paper introduces needs and current state of the art in the field of remanufacturing, also analyzes old products in terms of product variety and wear conditions with an example of automobile alternators. Then, a general and a product-specified remanufacturing process will be determined with them. Finally, this paper shows systemized guidelines for remanufacturing process of the specified parts. The results could be also used as a basic information for further remanufacturing applications.
Repair of Mold by Cold Spray Deposition and Mechanical Machining
Kang Hyuk-Jin ; Jung Woo-Gyun ; Chu Won-Sik ; Ahn Sung-Hoon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 101~107
Cold gas dynamic spray or cold spray is a novel manufacturing method for coatings. Cold spray is a high rate and direct material deposition process that utilizes the kinetic energy of particles sprayed at high velocity (300-1,200m/s). In this research, a technique to repair the damaged mold by cold spray deposition and mechanical machining was proposed. An aluminum 6061 mold with three-dimensional surface was fabricated, intentionally damaged and material-added by cold spray, and its original geometry was re-obtained successfully by Computer Numerical Control (CNC) machining. To investigate deformation of material caused by cold spray, deposition was conducted on thin aluminum plates (
). The average deformation of the plates was
by Coordinate Measurement Machine (CMM). In addition, the cross section of deposited layer was analyzed by scanning electron microscopy (SEM). To compare variation of hardness, Vickers hardness was measured by micro-hardness tester.
A Study on the Back Pressure Characteristics and Engine Performance of Muffler with Exhaust Variable Valve
Park Kyoung-Suk ; Park Se-Jong ; Suh Ho-Chul ; Son Sung-Man ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 108~113
Recently, Automobile manufactures have developing automotive exhaust system under consideration for improvement in engine performance. It thus develop many exhaust components. For example active muffler, semi-active muffler, electronic muffler etc. In this components consider enhanced back pressure and reduction noise. Especially, In recent years it develop the study of semi-active muffler. Semi-active muffler is simple structure and excel performance. Recently many forms semi-active muffler was developed and adopted to the actual use in consideration of cost and technical side for noise and vibration. This study had main objects about the recently developed the semi-active muffler. It was to show its combustion performance as well as its enhanced back pressure characteristics in design. Therefore if the precise analysis of the combustion pressure according to the back pressure transmission was carried out, it was understood that this study would be utilized in the design of the exhaust system such as the semi-active muffler.
Evaluation Method of Design for Environment (DFE) and Case Study for Cellular Phone Case
Kang Y.C. ; Ahn S.H. ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 114~121
In this paper, the concept of design for environment (DFE) was introduced to mechanical design and manufacturing of cellular phone case. A new evaluation method integrated in existing product manufacturing process was developed and applied to two different types of cellular phone cases: foldable type and slider type. The evaluation results suggested that scores for 'refurbishments & recycle' criterion were relatively low for their cases. This evaluation method may assist designers to draw a checklist of the product's weak points from the perspective of DFE. From the checklist, the designers can consider possible improvements in future design.
Experimental Study for Effective Flow and Force Area of Discharge Valve System in a Linear Compressor
Lee Byung-Chan ; Lee Hyuk ; Ahn Tae-Kil ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 122~129
The linear compressor has lately attracted considerable attention because of its low power consumption and excellent efficiency. For an efficient design, it is necessary to develop an analytical model of the linear compressor. The effective flow and force areas are important parameters to describe the behavior of the linear compressor, which are used to determine the mass flow rates through the valving systems and the forces on the valves, respectively. It is not easy to estimate these parameters because shapes of the valve systems of the linear compressor are so different from those of tile conventional valve systems. In this paper, we suggest method to measure experimentally the effective discharge flow and force areas of the linear compressor and analyze valve characteristic to apply the experimental results to their theoretical model.
Study on The Anti-Shock Performance Evaluation of TFT-LCD module for Mobile IT Devices
Kim Byung-Sun ; Kim Jung-Woo ; Lee Dock-Jin ; Choi Jae-Boong ; Kim Young-Jin ; Baik Seung-Hyun ; Chu Young-Bee ; Koo Ja-Choon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 130~137
TFT-LCD(Thin Film Transistor Liquid Crystal Display) module is representative commercial product of FPD(Flat Panel Display). Thickness of TFT-LCD module is very thin. It is adopted for major display unit for IT devices such as Cellular Phone, Camcorder, Digital camera and etc. Due to the harsh user environment of mobile IT devices, it requires complicated structure and tight assembly. And user requirements for the mechanical functionalities of TFT-LCD module become more strict. However, TFT-LCD module is normally weak to high level transient mechanical shock. Since it uses thin crystallized panel. Therefore, anti-shock performance is classified as one of the most important design specifications. Traditionally, the product reliability against mechanical shock is confirmed by empirical method in the design-prototype-drop/impact test-redesign paradigm. The method is time-consuming and expensive process. It lacks scientific insight and quantitative evaluation. In this article, a systematic design evaluation of TFT-LCD module for mobile IT devices is presented with combinations of FEA and testing to support the optimal shock proof display design procedure.
Fabrication of Nanoscale Structures using SPL and Soft Lithography
Ryu Jin-Hwa ; Kim Chang-Seok ; Jeong Myung-Yung ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 138~145
A nanopatterning technique was proposed and demonstrated for low cost and mass productive process using the scanning probe lithography (SPL) and soft lithography. The nanometer scale structure is fabricated by the localized generation of oxide patterning on the H-passivated (100) silicon wafer, and soft lithography was performed to replicate of nanometer scale structures. Both height and width of the silicon oxidation is linear with the applied voltagein SPL, but the growth of width is more sensitive than that of height. The structure below 100 nm was fabricated using HF treatment. To overcome the structure height limitation, aqueous KOH orientation-dependent etching was performed on the H-passivated (100) silicon wafer. Soft lithography is also performed for the master replication process. Elastomeric stamp is fabricated by the replica molding technique with ultrasonic vibration. We showed that the elastomeric stamp with the depth of 60 nm and the width of 428 nm was acquired using the original master by SPL process.
Microstereolithography using a Digital Micromirror Device as the Dynamic Pattern Generator
Joo Jae-Young ; Kim Sung-Hoon ; Byun Hong-Seok ; Lee Kwan-Heng ; Jeong Sung-Ho ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 146~151
In order to increase the productivity of conventional microstereolithography, a new method using a digital micromirror device (
) as the dynamic patter generator is proposed. The deviation from the level of clear optical images to the level of photopolymer surface is a key for the fabrication of an accurate 3D structure, so this deviation is minimized by controlling the viscosity of FA 1260T with organic solvents. After finding the appropriate process variables, the feasibility of microstructure fabrication such as a microgear and a microsphere is demonstrated. Microstereolithography with
showed the potential to replace the existing focused beam microstereolithography.
Dynamic Threshold Model of Spasticity that Can Predict Various Pendulum Motions
Kim Chul-Seung ; Kong Se-Jin ; Kwon Sun-Duck ; Kim Jong-Moon ; Eom Gwang-Moon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 152~158
The objective of this work is to develop the knee joint model for representing various pendulum motions and quantifying the spasticity. Knee joint model included the extension and flexion muscles. The joint moment consists of both the active moment from the stretch reflex and the passive moment from the viscoelastic joint properties. The stretch reflex was modeled as nonlinear feedback of muscle length and the muscle lengthening velocity, which is Physiologically-feasible. Moreover, we modeled the spastic reflex as having dynamic threshold to account far the various pendulum trajectories of spastic patients. We determined the model parameters of three patients who showed different pendulum trajectories through minimization of error between experimental and simulated trajectories. The simulated joint trajectories closely matched with the experimental ones, which show the proposed model can predict pendulum motions of patients with different spastic severities. The predicted muscle force from spastic reflex appeared more frequently in the severe spastic patient, which indicates the dynamic threshold relaxes slowly in this patient as is manifested by the variation coefficient of dynamic threshold. The proposed method provides prediction of muscle force and intuitive and objective evaluation of spasticity and it is expected to be useful in quantitative assessment of spasticity.
A Study on Human Body Impact Characteristics of the Human-rifle System on Shooting
Lee Young-Shin ; Lee Jang-Won ; Choi Young-Jin ; Chae Je-Wook ; Choi Eui-Jung ; Kim In-Woo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 159~167
The impact time history of human body with K2 rifle on stand shooting posture is analyzed and compared with experimental results. Analysis model is Korean 50% tile of twenties and height, weight is 174 cm, 62 kgf respectively. The muscle and bone human model of Korean man's twenties 50% tile is applied. ADAMS program is used for kinematic analysis and human model is developed by Life Mod program. The effect of the ground support condition, grip position and human weight factor are studied. Maximum impact force of shoulder is 784 N. The horizontal displacement of K2 rifle muzzle is 2.9 cm.
A Study on the Development of SFF System based on 3DP Process
Lee Won-Hee ; Kim Jung-Su ; Lee Min-Cheol ; Kim Dong-Soo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 168~176
Nowadays, Three dimensional printing (3DP) technique that is one of solid freeform fabrication (SFF) technology has been notable issue, and has been applied by various fields. The SFF system can fabricate three dimensional objects of solid freeform with high speed and low cost using ink jet printing technology. In this research, a SFF system to analyze 3DP process technology is developed. We applied sliding mode control with sliding perturbation observer (SMCSPO) algorithm and minimized position error to the developed SFF system. We analyzed and optimized process variables such as jetted volume, layer thickness, powder bed and so on experimentally. Also. the dimensional error of a developed SFF system is evaluated. Finally, the feasibility of application to bio manufacturing is presented through successful fabrication of teeth and cranium model.
A Study of Design for Hot Tool to Minimize Radius of Heat Affected Zone in Rapid Heat Ablation process
Kim Hyo-Chan ; Lee Sang-Ho ; Park Seung-Kyo ; Yang Dong-Yol ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 177~186
In order to realize a three-dimensional shape on CAD, the machining process has been widely used because it offers practical advantages such as precision and versatility. However, the traditional machining process needs a large amount of time in cutting a product and the remained material causes trouble such as inconvenience due to cleaning process. Therefore, a new rapid manufacturing process, Rapid Heat Ablation process (RHA) using the hot tool, has been developed. In this paper, the hot tool for RHA process is designed to minimize radius of heat affected zone. TRIZ well-known as creative problem solving method is applied to overcome the contradictive requirements of the hot tool. For the detailed design of the hot tool, numerical model is established with several assumptions. In order to verify the numerical results, surface temperature of the hot tool is measured with K-type thermocouple at the predetermined location. Numerical and experimental results show that the devised hot tool fulfils its requirements. The practicality and effectiveness of the designed hot tool have been verified through experiments.
Offset of STL Model Generated from Multiple Surfaces
Kim Su-Jin ; Yang Min-Yang ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 7, 2006, Pages 187~193
This paper introduces and illustrates the results of a new method for offsetting the triangular mesh generated from multiple surfaces. The meshes generated from each surface are separated each other and normal directions are different. The face normal vectors are flipped to upward and the lower faces covered by upper faces are deleted. The virtual normal vectors are introduced and used to of feet boundary. It was shown that new method is better than previous methods in offsetting the triangular meshes generated from multiple surfaces. The introduced offset method was applied for 3-axis tool path generation system and tested by NC machining.