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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 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
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Technology Trend on Innovation of Control System by IT-fusion and Implementation of Nano-level Accuracy
Kim Chan-Bong ; Kim Kyung-Don ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 7~14
Understanding and Development of Programmable Automation Controllers (PACs) having Multi-Domain Functionality
Kim Kyung-Don ; Lee Kang-Joo ; Kim Chan-Bong ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 15~21
Design of Super-precision Linear Motor
Lee Woo Young ; Rim Kyung Hwa ; Seol Jin Soo ; Kim Hyun Chul ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 22~29
A Novel Cylindrical Capacitive Sensor for both Radial and Axial Motion Measurements
Kim Jong Hyuk ; Ahn Hyeong Joon ; Jang Dong Young ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 30~39
Development of a Precision Dynamometer for Testing of Nano Servo Motor System
Lee E.S. ; Roh C.Y. ; Lee M.K. ; Roh M.H. ; Kim J.K. ; Park J.J. ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 40~46
A Study on Endurance Estimation of ultra Precision Reverse-Locking Clutches under Contact Condition
Suh Jeong Se ; Lee Seok Soon ; Lee Tae Sun ; Choi Jung Hoan ; Lee Sang Bum ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 47~54
A dangerous event occurred at the field industry and mechanical system. At developed by SUNGGOKNANOTECH corp. a R-L clutches of a small and high capacity serves safety device from a variety environment of mechanical system, it permits transmission of driving torque from input to output shaft in both directions of rotation, but restrains any feedback torque of the driven load from rotating the output shaft in either direction. This study was carried out to demonstrate through finite element method and durability estimation for safety of the R-L clutches without sliding during the engagement process. As results, we organized about endurance test method when applied rated torque.
Verification for transcription of spherical radius and prediction of birefringence in injection molding optical lens
Ohmori Hitoshi ; Kwak Tae Soo ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 55~60
This paper has been focused in developing of plastic lens with ultra-precision and low birefringence ability using by injection molding simulation tools. The simulation tools,
were applied to visualize indirectly the flow pattern of melted polymer enter the mould and the simulation results are verified as compared with the experimental results. Birefringence and polarized light generated in injection molding process was also calculated for each injection conditions and compared with .the pictures of experimented optical lens go through the polarized light plates device. A spherical radius of plastic optical lens transcribed from profile of mould core surface was measured to estimate the geometrical accuracy fer the each injection conditions. It is confirmed that the simulation results about flow pattern and polarized light area coincided in experimental results. It is known that increasing in thickness shrinkage at center of lens, the spherical radius is larger from comparing the graph measured spherical radius and the thickness shrinkage at center of lens
A Study on the Environmentally Conscious Machining Technology Cutting Fluid Atomization and Environmental Impact in Grinding Operation (I)
Hwang Joon ; Chung Eui-Sik ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 61~69
This paper presents the experimental results to analyze the atomization characteristics and environmental impact of cutting fluid in grinding process. Grinding is a major machining process to improve surface quality with different machining mechanism which is compared with turning or milling process. The environmental impact due to aerosol generation via grinding process is a major concern associated with environmental consciousness. Experimental results show that the generated fine aerosol which particle size less than 10 micron appears near working zone under given operational conditions. The aerosol concentration is much higher enough to affect human health risk with its generated aerosol quantities. This study can be provided a basic knowledge fur further research of environmental consciousness machining development.
An Adaptive Control of Servo Motors for Reducing the Effect of cogging Torques
Lee Soo Han ; Heo Sang Jin ; Shin Kyu Hyeon ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 70~75
Many researches have been focused on optimal designs of a pole shape in order to reduce cogging torques, which are generated between permanent magnets and slots. In this paper, an adaptive controller is proposed fur reducing the effect of cogging torques in servo motors. The controller stabilizes the control system and shows an excellent trajectory tracking performance compared to the conventional PD controller.
High-accuracy Motion Control of Linear Synchronous Motor
Jeong Seong Hyun ; Sung Jun Yup ; Park Jung Il ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 76~82
In this paper, the pole placement controller based on the Robust Internal-loop Compensator (RIC) structure, which has inherent structural equivalence to disturbance observer, is proposed to control a linear positioning system. This controller has the advantage to easily select controller gains by using pole placement without loss of that of original RIC structure. The principal is to construct the pole placement controller for a nominal internal model instead of unknown real plant. Using linear motion experiment showed the effectiveness of the proposed controller.
Development of On-line Displacement Monitoring System for High Temperature Steam Pipe of Fossil Power Plant
Lee Young Shin ; Hyun Jung Seob ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 83~89
Most domestic fossil power plants have exceeded 100,000 hours of operation with the severe operating condition. Among the critical components of fossil power plant, high temperature steam pipe systems have had a many problems and damage from unstable displacement behavior because of frequent start up and shut down. In order to prevent the serious damage and failure of the critical pipe system in fossil power plants, 3-dimensional displacement measurement system was developed for the on-line monitoring. Displacement measurement system was developed with a use of a LVDT type sensor and two rotary encoder type sensors. This system was installed and operated on the real power plant successfully.
Control of Magnetic Flywheel System by Neuro-Fuzzy Logic
Yang Won-Seok ; Kim Young-Bae ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 90~97
Magnetic flywheel system utilizes a magnetic bearing, which is able to support the shaft without mechanical contacts, and also it is able to control rotational vibration. Magnetic flywheel system is composed of position sensors, a digital controller, actuating amplifiers, an electromagnet and a flywheel. This work applies the neuro-fuzzy control algorithm to control the vibration of a magnetic flywheel system. It proposes the design skill of an optimal controller when the system has structured uncertainty and unstructured uncertainty, i.e. it has a difficulty in extracting the exact mathematical model. Inhibitory action of vibration was verified at the specified rotating speed. Unbalance response, a serious problem in rotating machinery, is improved by using a magnetic bearing with neuro-fuzzy algorithm.
A Sliding Mode Control for a Robot Manipulator with closed-chain Structure
Choi Hyeung Sik ; Baek Chagng Yul ; Hwang I Chul ; Kim Moo Kyung ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 98~108
Conventional robot manipulators actuated by motors with the speed reducer such as the harmonic drive have weakness in the load capacity, since the speed reducer does not have enough strength. To improve this, a new type of robot actuator based on the four-bar-link mechanism driven by the ball screw was constructed. Also, a new type of revolute robot manipulator composed of the developed actuators was developed. But, modelling errors occur due to the off-set from the nominal model since the exact modeling of the complex inertia variation of the four-bar-link actuator is very difficult. To control the proposed robot along the prescribed trajectory, a sliding mode control algorithm was applied with compensation function for the modeling errors. To show performance of the proposed controller, a computer simulation was performed, and its results was presented.
Development of Acoustic Emission Monitoring System for Fine Machining - Application to Cutting State Monitoring in a Fine Fixed-abrasive Machining -
Kim Hwa Young ; Ahn Jung Hwan ; Kim Sung Ryul ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 109~117
In case of fine machining processes, the cutting state monitoring by a skilled operator is impossible because the physical changes generated during fine machining are very weak. To realize the high efficient and precise fine machining, it is necessary to develop the sensor based monitoring system which is able to detect the fine changes of cutting state. In this paper, the fine acoustic emission monitoring system is developed to monitor the state of the fine machining process. The developed system consists of the AE sensor and the AE signal processing unit. And this has the high-sensitivity and bandwidth which can detect fine AE signal generated during fine machining process. In order to investigate the feasibility of the developed system, evaluation experiments were performed in the fine fixed-abrasive machining processes such as polishing and glass ferrule slicing. Experimental results show that the developed monitoring system possesses an excellent real-time monitoring capability at fine machining processes.
A Study on the Walking Stability of the Quadruped Robot with WBO
Choi Gi Hun ; Kim Young Tark ; Yoo Jae Myung ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 118~126
There are many types of walking robots in the world. For dynamic walking of the robots it is necessary to keep its dynamic stability. The dynamic stability is influenced by the position of ZMP (zero moment point). In this paper we study the control of the ZMP position of walking robot. For experiment we developed a quadruped robot and analyzed the dynamic stability of the robot. Developed robot has 2 joints at each leg and WBO (weight balancing oscillator) on the body of the robot. The WBO is designed to move linearly from side to side when the robot walks dynamically. Walking test was performed to verify the validity of the proposed methods. Especially we showed that the dynamic stability of the robot can be improved without sacrifice of the walking speed by control the WBO.
Perception Method of the Marking Location for Automation of Billet Marking Processes
Park Jin-Woo ; Yook Hyunho ; Che Wooseong ; Boo Kwangsuck ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 127~134
The machine vision has been applied to a number of industrial applications for quality control and automations to improve the manufacturing processes. In this paper, the automation system using the machine vision is developed, which is applicable to the marking process in a steel production process line. The working environment is very harsh to workers so that the automatic system in the steel industry is required increasingly. The developed automatic marking system consists of several mechanical and electrical elements such as the laser position detecting sensor system fur a structured laser beam which is projected to the billet in order to detect the geometry of the billet. An image processing algorithm has been developed to percept the two center positions of a camera and a billet, respectively, and to align two centers. A series of experiments has been conducted to investigate the performance of the proposed algorithm. The results show that two centers of the camera and the billet could be detected very well and differences between two center positions could be also decreased via the proposed location error decreasing algorithm
Development of Shoes Process Management Monitoring System for Supporting SCM Using LabVIEW
Lee Byung Woo ; Kim Chang Dong ; Lee Young Jin ; Go Seok Jo ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 135~143
The shoes process management monitoring system for supporting SCM is developed in this study. This system consists of a monitoring program, a conveyer system, a pneumatic unit, a controller, an USB camera, and a server and a client computer. To operate the developed system easily, the monitoring program using LabVIEW in the Windows environment is developed. This program consists of 5 modules: production management, inventory control, media management, defective management, and communication management. The developed system has several advantages: reduced time for managing process work, decreased labor costs, effective operation, and continuous work without an operator. Nowadays advanced manufacturing companies are trying to find a way to check the performance of their production equipments and plants from remote sites. Thus, to manage the developed system from remote sites, communication network is constructed. In order to evaluate the performance of the monitoring system, experiments were performed. The experimental results showed that the developed system provided a reliable performance and a stable communication.
Dynamic Characteristic Evaluation of Spin Coater Module for GaAs Wafer Bonding
Song Jun Yeob ; Kim Ok Koo ; Kang Jae Hoon ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 144~151
Spin coater is regarded as a major module rotating at high speed to be used build up polymer resin thin film layer fur bonding process of GaAs wafer. This module is consisted of spin unit for spreading uniformly, align device, resin spreading nozzle and et. al. Specially, spin unit which is a component of module can cause to vibrate and finally affect to the uniformity of polymer resin film layer. For the stability prediction of rotation velocity and uniformity of polymer resin film layer, it is very important to understand the dynamic characteristics of assembled spin coater module and the dynamic response mode resulted from rotation behavior of spin chuck. In this paper, stress concentration mode and the deformed shape of spin chuck generated due to angular acceleration process are presented using analytical method for evaluation of structural safety according to the revolution speed variation of spin unit. And also, deformation form of GaAs wafer due to dynamic behavior of spin chuck is presented fur the comparison of former simulated results.
Fatigue Crack Closure and Propagation Behavior Under Mixed-Mode Loading Observed by the Direct Measuring Method
Song Sam Hong ; Seo Ki Jeong ; Lee Jeong Moo ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 152~158
The stress conditions acting on the practical structure are complex, and thus most cracks existing in the practical structures are under mixed-mode loading conditions. The effect of shear load component of mixed-mode loading acts more greatly in the stage of crack initiation and initial propagation than crack propagation stage. Hence, research on the behavior in the stage of crack initiation and initial propagation need to be examined in order to evaluate behavior of mixed-mode fatigue cracks. In this study, the crack tip displacement(CTD) was measured by using the direct measuring method(DMM). We examined the behavior at crack tip by determining crack opening load
. From the test results, the propagation behavior of mixed-mode fatigue cracks was evaluated by considering mixed-mode crack closure. Also, we examined the characteristic of crack propagation under mixed-mode loading with crack propagation direction.
Crack Face Friction Effects on Mode II Stress Intensities for a Surface-Cracked Coating In Two-Dimensional Rolling
Moon Byung-Young ; Kim Byeong Soo ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 159~167
This work focuses on the effects of crack free friction on Mode II stress intensity factors,
, for a vertical surface crack in a two-dimensional finite element model of TiN/steel subject to rolling contact. Results indicate that maximum
values, which occur when the load is adjacent to the crack, may be significantly reduced in the presence of crack face friction. The reduction is more significant for thick coatings than for thin. Crack extension and increased layer thickness result in increased
values. The effect of crack face friction on compressive
values appears negligible. Comparative results are presented for
and diamond-like carbon(DLC)/Ti systems.
The Study for Cell Morphology with Gas Cocktail in Microcellular Foaming Process
Cha Sung Woon ; Yoon Jae Dong ; Lee Yoon Sung ; Kim Hak Bin ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 168~174
Nowadays, the companies use polymer materials for many purposes fur they have many advantages. The costs of these materials take up too high a proportion of the overall cost of products that use these materials as their major material. It is advantage for polymer industries to reduce these costs. The microcellular foaming process was developed in the early 1980s to solve this problem and proved to be quite successful. Microcellular foaming process uses inert gases such as
. As these gases solve into polymer matrices, many properties are changed. The microcellular foaming process makes the glass transition temperature of polymers to low, and diminish the residual stress of polymer matrices. Besides, the microcellular foaming process has several merits, impact strength elevation, thermal insulation, noise insulation, and raw material saving etc. In previous research, many facts of microcellular foaming process are founded its characteristics. But previous researcher found the characteristics of microcellular foaming process with pure gas, for example
and so on, they did not found the characteristics of microcellular foaming process with one more gases. If one more gases inlet the resin, the characteristics of microcellular foaming process is changed very amazingly. In this paper, discuss on the characteristics of microcellular foaming process wi th gas cocktail about cell morphology.
Fabrication and Static Bending Test in Ultra Light Inner Structured and Bonded(ISB) Panel Containing Repeated Inner Pyramidal Structure
Jung Chang Gyun ; Yoon Seok-Joon ; Lee Sang Min ; Na Suck-Joo ; Lee Sang-hoon ; Ahn Dong-Gyu ; Yang Dong-Yol ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 175~182
Inner structured and bonded panel, or ISB Panel, as a kind of sandwich type panel, has metallic inner structures which have low relative density, because of their dimensional shape of metal between a pare of metal skin sheets or face sheets. In this work, ISB panels and inner structures formed as repeated pyramidal shapes are introduced. Pyramidal structures are formed easily with expanded metal sheet by the crimping process. Three kinds of pyramidal structures are made and used to fabricate test specimen. Through the multi-point electrical resistance welding, inner structures are bonded with skin sheet. 3-point bending tests are carried out to measure the bending stiffness of ISB panel and experimental results are discussed.
Calculation of Information Contents in Axiomatic Design
Shin Gwang-Seob ; Yi Jeong-Wook ; Yi Sang-Il ; Kwon Yong-Deok ; Park Gyung-Jin ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 183~191
Axiomatic design offers a scientific base for design in an efficient way. It is well known that it has two axioms: the Independence Axiom and the Information Axiom. Many applications of the Independence Axiom have been published, however, the Information Axiom has been mainly applied to IFR (functional requirement) - 1DP (design parameter) problems except fer a few case studies. This research presents various methods for calculation of information content. Generally, the information content is evaluated by the probability of success. The probability of success is calculated in two ranges: the FR range and the DP range. In the FR range, the graphical method is utilized with uniform distribution of the DP. In the FP range, the integration method is employed. It is noted that any distribution function of the DP can be accommodated in the integration method. The developed method can be applied to a decoupled design with multiple FRs and DPs. The developed method is extended to a coupled design and a design with a hierarchical structure of axiomatic design.
The Effect of Exhaust System Components on the Sl Engine Performance
Park Kyoungsuk ; Park Sejong ; Son Sungman ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 192~198
Recently, Automobile manufacturers regarding stability, economic environmental-friendly problems by the development of automobile. This reason is increasingly strict environmental regulations to lower fuel consumption and reduce emission. Designing more efficient and low emission control exhaust system results in more efficient Performance, reduced back Pressure and higher convert efficiency. Also to reduce the noise and the vibration of the automobile. According to develop variable type muffler, dual muffler and active intelligence exhaust system unit. Improvement in engine performance and fuel consumption rate, higher conversion efficiency demand information of pressure fraction and heat characteristics. To be able to determine these factor fur we experiment on each case of exhaust system unit. In this study, how back pressure is distributed in flow-through in exhaust system and how to design exhaust system flexibleness, efficiency, lower back pressure and optimal performance. This study furnish basic data for engineers, technicians.
Energy Harvesting for Bio MEMS using Piezoelectric Materials
Sohn Jung Woo ; Choi Seung Bok ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 199~206
In this work, a theoretical investigation on the energy harvesting is undertaken using one of potential smart materials; piezoelectric material. The energy equations fur both square and circular types of the piezoelectric material are derived, and the energy generated from two commercially available Products:
and PVDF (polyvinylidene fluoride) are investigated in terms of the thickness and area. In addition, a finite element analysis (FEA) is undertaken to obtain the generated energy due to the uniform pressure applied on the surface of the piezoelectric materials. A comparative work between the theory and the FEA is made followed by the brief discussion on the usage of the harvested energy for Bio MEMS.
Control of FES Cycling Considering Muscle Fatigue
Kim Chul-seung ; Hase Kazunori ; Kang Gon ; Eom Gwang-moon ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 207~212
The purpose of this work is to develop the FES controller that can cope with the muscle fatigue which is one of the most important problems of current FES (Functional Electrical Stimulation). The feasibility of the proposed FES controller was evaluated by simulation. We used a fitness function to describe the effect of muscle fatigue and recovery process. The FES control system was developed based on the biological neuronal system. Specifically, we used PD (Proportional and Derivative) and GC (Gravity Compensation) control, which was described by the neuronal feedback structure. It was possible to control of multiple joints and muscles by using the phase-based PD and GC control method and the static optimization. As a result, the proposed FES control system could maintain the cycling motion in spite of the muscle fatigue. It is expected that the proposed FES controller will play an important role in the rehabilitation of SCI patient.
A Development of an Insole Type Local Shear Measurement Transducer and Measurements of Local Plantar Shear Force During Gait
Jeong Im Sook ; Ahn Seung Chan ; Yi Jin Bok ; Kim Han Sung ; Kim Young Ho ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 213~221
An insole type local shear force measurement system was developed and local shear stresses in the foot were measured during level walking. The shear force transducer based on the magneto-resistive principle, was a rigid 3-layer circular disc. Sensor calibrations with a specially designed calibration device showed that it provided relatively linear sensor outputs. Shear transducers were mounted on the locations of four metatarsal heads and heel in the insole. Sensor outputs were amplified, decorded in the bluetooth transmission part and then transferred to PC. In order to evaluate the developed system, both shear and plantar pressure measurements, synchronized with the three-dimensional motion analysis system, were performed on twelve young healthy male subjects, walking at their comfortable speeds. The maximum peak pressure during gait was 5.00kPa/B.W at the heel. The time when large local shear stresses were acted correlated well with the time of fast COP movements. The anteroposterior shear was dominant near the COP trajectory, but the mediolateral shear was noted away from the COP trajectory. The vector sum of shear stresses revealed a strong correlation with COP movement velocity. The present study will be helpful to select the material and to design of foot orthoses and orthopedic shoes for diabetic neuropathy or Hansen disease.
Investigation into Development of Rapid Heat Ablation process Using hot tool
Kim Hyo Chan ; Lee Sang Ho ; Park Seong Kyo ; Yang Dong Yol ;
Journal of the Korean Society for Precision Engineering, volume 22, issue 6, 2005, Pages 222~231
Recently, life cycle and lead-time of products have been shortened with the demand of customers. Therefore, it is important to reduce time and cost at the stage of manufacturing trial molds. 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 for clarity. In this work, a new rapid manufacturing process using the hot tool, Rapid Heat Ablation process, has been developed to overcome such limitations. While the hot tool moves the predetermined path, the heat of the tool decomposes the remained material. The radius of heat affect ed zone related to process parameters was investigated through experiments to improve the quality of ablated parts. In order to examine the applicability of the proposed process, three-dimensional shapes such as hemisphere and standard test part, wereablatedutilizingtheapparatus.