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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
Web-based Product Development Engineering Collaboration System: System Framework
Park Ji-Hyung ; Kim Sung-Joon ; Jang Yong-Hyun ; Park Kyung-Hwa ; Lee Gyu-Bong ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 7~14
Web-based CAE Service System for Distributive Collaborative Engineering Environment
Kim Ki-Il ; Kwon Ki-Eak ; Park Ji-Hyung ; Cho Seong-Wook ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 15~23
Development of Engineering Framework for Templated Structural Analysis
Chung Il-Yong ; Ga Chung-Sik ; Lee Gyu-Bong ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 24~29
Engineering Information Search based on Ontology Mapping
Jung Min ; Suh Hyo-Won ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 30~36
The participants in collaborative environment want to get the right information or documents which are intended to find. In general search systems, documents which contain only the keywords are retrieved. For searching different word-expressions for the same meaning, we perform mapping before searching. Our mapping-based search approach has two parts, ontology-based mapping logic and ontology libraries. The ontology-based mapping consists of three steps such as character matching (CM), definition comparing (DC) and similarity checking (SC). First, the character matching is the mapping of two terminologies that have identical character strings. Second, the definition comparing is the method that compares two terminologies' ontological definitions. Third, the similarity checking pairs two terminologies which were not mapped by two prior steps through evaluating the similarity of the ontological definitions. For the ontology libraries, document ontology library (DOL), keyword ontology library (KOL), and mapping result library (MRL) are defined. With these three libraries and three mapping steps, an ontology-based search engine (OntSE) is built, and a use case scenario is discussed to show the applicability.
Development of Optimization Technique of Warm Shrink Fitting Process for Automobile Transmission Part(Shaft/Gear)
Kim Ho-Yoon ; Bae Won-Byong ; Kim Chul ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 37~43
Fitting process carried out in automobile transmission assembly line is classified into three classes; heat fitting, press fitting, and their combined fitting. Heat fitting is a method that heats gear to a suitable range under the tempering temperature and squeezes it toward the outer diameter of shaft. Its stress depends on the yield strength of gear. Press fitting is a method that generally squeezes gear toward that of shaft at room temperature by press. Another method heats warmly gear and safely squeezes it toward that of shaft. Warm shrink fitting process for automobile transmission part is now gradually increased, but the parts (shaft/gear) assembled by this process produced dimensional change in both outer diameter and profile of the gear. So that it may cause noise and vibration between gears. In order to solve these problems, we need an analysis of warm shrink fitting process, in which design parameters are involved; contact pressure according to fitting interference between outer diameter of shaft and inner diameter of gear, fitting temperature, and profile tolerance of gear. In this study, an closed form equation to predict contact pressure and fitting load was proposed in order to develop optimization technique of warm shrink fitting process and verified its reliability through the experimental results measured in the field and FEM, that is, thermal-structural coupled field analysis. Actual loads measured in the field have a good agreement with the results obtained by theoretical and finite element analysis and also the expanded amounts of the outer diameters of the gears have a good agreement with results.
A Study on the Characteristics on Ultra Precision Machining of IR Camera Mirror
Kim Gun-Hee ; Kim Hyo-Sik ; Shin Hyun-Soo ; Won Jong-Ho ; Yang Sun-Choel ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 44~50
This paper describs about the technique of ultra-precision machining for an infrared(IR) camera aspheric mirror. A 200 mm diameter aspheric mirror was fabricated by SPDTM(Single Point Diamond Turning Machine). Aluminum alloy as mirror substrates is known to be easily machined, but not polishable due to its ductility. Aspheric large reflector without a polishing process, the surface roughness of 5 nm Ra, and the form error of
for reference curved surface 200 mm has been required. The purpose of this research is to find the optimum machining conditions for cutting reflector using Al6061-T651 and apply the SPDTM technique to the manufacturing of ultra precision optical components of Al-alloy aspheric reflector. The cutting force and the surface roughness are measured according to each cutting conditions feed rate, depth of cut and cutting speed, using diamond turning machine to perform cutting processing. As a result, the surface roughness is good when feed rate is 1mm/min, depth of cut
and cutting speed is 220 m/min. We could machined the primary mirror for IR camera in diamond machine with a surface roughness within
Rt on aspheric.
Press Forming of Extruded Aluminum Profile for Automotive Parts
Choi Young ; Park Joon-Hong ; Kang Myun-Gyu ; Oh Kae-Hee ; Park Sang-Woo ; Yeo Hong-Tae ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 51~58
The necessities for heightening fuel efficiency as well as lightweight design, lead to an increase of the use of aluminum alloys in the automobile industry. Extruded aluminum profile channels are used widely for the design of frame parts as lightweight assemblies, especially if a high stiffness is needed. While many applications can be realized with forming of hollow square-sectioned extruded profiles such as a stretch bending and a hydro-forming, some applications demand the use of a press bending which can be hardly found in the previous study. In this study, by introducing the use of a press bending into car sub-frames, the demands for higher accuracy as well as higher flexible method than the conventional methods will be satisfied. With respect to the design of sub-frames, the process planning was performed from the shape of a sub-frame product. The designed processes were analyzed by the commercial FEM code, DEFORM-3D. Forming dies for the each process were designed and prototypes of sub-frames were manufactured by the verified farming process. In addition, some of the important features of design parameters in the press bending were reviewed.
Velocity Measurements of Slurry Flows in CMP Process by Particle Image Velocimetry
Kim Mun-Ki ; Yoon Young-Bin ; Koh Young-Ho ; Hong Chang-Gi ; Shin Sang-Hee ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 59~67
Chemical Mechanical Polishing(CMP) in semiconductor production is characterized its output property by Removal Rate(RR) and Non-Uniformity(NU). Some previous works show that RR is determined by production of pressure and velocity and NU is also largely affected by velocity of flowfield during CMP. This study is about the direct measurement of velocity of slurry during CMP and whole flowfield upon the non-groove pad by Particle Image Velocimetry(PIV). Typical PIV system is modified adequately for inspecting CMP and slurry flowfield is measured by changing both pad rpm and carrier rpm. We performed measurement with giving some variation in the kinds of pad. The results show that the flowfield is majorly determined not by Carrier but by Pad in the case of non-groove pad.
Noise Robust Emotion Recognition Feature : Frequency Range of Meaningful Signal
Kim Eun-Ho ; Hyun Kyung-Hak ; Kwak Yoon-Keun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 68~76
The ability to recognize human emotion is one of the hallmarks of human-robot interaction. Hence this paper describes the realization of emotion recognition. For emotion recognition from voice, we propose a new feature called frequency range of meaningful signal. With this feature, we reached average recognition rate of 76% in speaker-dependent. From the experimental results, we confirm the usefulness of the proposed feature. We also define the noise environment and conduct the noise-environment test. In contrast to other features, the proposed feature is robust in a noise-environment.
Development of the Robot's Gripper Control System using DSP
Kim Gab-Soon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 77~84
This paper describes the design and implementation of a robot's gripper control system. In order to safely grasp an unknown object using the robot's gripper, the gripper should detect the force of gripping direction and the force of gravity direction, and should perform the force control using the detected forces and the robot's gripper control system. In this paper, the robot's gripper control system is designed and manufactured using DSP(Digital Signal Processor), and the gripper is composed of two 6-axis force/moment sensors which measures the Fx force(force of x-direction), Fy force, Fz force, and the Mx moment(moment of x-direction), My moment, Mz moment at the same time. The response characteristic test of the system is performed to determine the proportional gain Kp and the integral gain Ki of PI controller. As a result, it is shown that the developed robot's gripper control system grasps an unknown object safely.
A Driving Algorithm for a Switched Reluctance type Contact-Free Linear Stage
Lee Sang-Heon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 85~92
Recently in the field of precision positioning device, the contact-free stages are gaining focuses with their outstanding performances by eliminating mechanical frictions. This paper presents the driving algorithm for contact-free linear stage based on switched reluctance principle. The proposed driving algorithm has a similar structure of that of switched reluctance motor but this study has its own originality in terms of reducing the normal farces and force ripple at the same time. The simulation and experiment are executed to verify the proposed algorithm.
Integrated Controller Design for Multi-Axis CNC Systems
Lee Hak-Chul ; Jee Sung-Chul ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 93~102
This paper proposes a controller design analysis for three-axis CNC systems considering both contouring and tracking performance. The proposed analysis inclusively combines axial controllers for each individual feed drive system together with cross-coupling controller at the beginning design stage as an integrated manner. These two controllers used to be separately designed and analyzed since they have different control objectives. The proposed scheme includes a stability analysis for the overall control system and a performance analysis in terms of contouring and tracking accuracy. Computer simulation is performed and the results show the validity of the proposed methodology. Further, the results can be used as a basic guideline in systematic and comprehensive controller design for multi-axis CNC systems.
Development of an Optical Alignment Control Module with High Speed and Accuracy for Optics-Based Products
Kim Seung-Chul ; Kim Gyung-Bum ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 103~110
Automatic optical alignment modules are a key technology in optical communication system. However, the optic component assembly depends highly on manual or semi-automated alignment process. In this paper, a novel alignment mechanism with minimum degree-of-freedom has been designed and theoretical models are derived from geometric optical characteristics on collimators, optical filters and optical ray alignment. The automatic alignment control algorithm has been newly developed based on the mechanism and models, and then we make fast, precise and reliable alignment through the algorithm. The reliability of developed modules has been verified with various simulations and performance evaluations.
Web-based Product Development System Using SOAP
Lee Seok-Hee ; Kim Ho-Chan ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 111~118
Better understanding and sharing information are getting important to manage interdisciplinary product development team in a globally-distributed company. This study proposes a solution to implement RPD(Rapid Product Development) system for the distributed development teams using SOAP(Simple Object Access Protocol). And a new approach is introduced for the better understanding of product geometry among the development members in different place and the easy sharing of product information. An application example shows that SOAP operates in distributed environment more efficiently than other RPC(Remote Procedure Call) techniques and it does not respond sensitively to firewall. And SOAP is an excellent RPC and messaging technique to exchange structured data. Procedures developed with use of SOAP are worked together with web, and users can use remote services as an application program in their local computer.
Concept Design of Modular Mobile Phone using Axiomatic Approach
Cha Sung-Woon ; Lee Kyung-Soo ; Kim Min-Soo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 119~127
Design structure of a mobile phone has been changed to a converged style, which has so many functions. However, the converged mobile phone could not satisfy the users who want to use only specific functions, so with Axiomatic Design, we have studied for making a proposal to set up the new concept. The goal of this study is to derive a general solution with Axiomatic Design to verify the Independence. By enhancing the existing design model and differentiating the function of mobile phone, user will be able to choose desirable products, which have only specific functions and/or specific parts. First of all, we checked the Independence about the existing design model. Then, we developed the new design model with the idea that base mobile phone should have basic functions and additional functions can be separated, surely be connected when users want.
A Study on Dynamic Characteristics of Induction Motor System
Lee Hyoung-Woo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 128~136
To predict the noise and vibration characteristics of induction motor system, it is necessary to develop the mathematical model including all the mechanical elements such as shaft, blower, rotor, fan, bearing, case and mounting parts. Coupling effect between case-mount system and rotor- shaft system including shaft, blower, rotor, fan and bearing is examined. Impact exciting experimentation was done in order to verify vibration model of the induction motor system. From experimental results, we can appreciate that the natural frequencies of induction motor system are in good agrements with analysis.
A Study on the Suitable Number of the Exhaust Variable Valve Spring for Semi-active Muffler
Park Se-Jong ; Seo Ho-Chul ; Son Sung-Man ; Park Kyoung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 137~142
The muffler which reduce the exhaust noise and vibration from engine influence on the engine performance. Recently, exhaust variable valve has set up in the muffler controls the backpressure in the exhaust system. And the backpressure variation according to the exhaust variable valve opening has developed the engine performance. First, the preceding of structural analysis is needed and simulation experiment is requested for the study on the design factor to influence on the operation of the exhaust variable valve. In this study, setting up the various variables according to each composition element needed for the structural analysis of the exhaust variable valve, it is experimented the analysis on the influence of each design factor with the calculation of stress distribution and the displacement to cause about the backpressure for the valve through parameter study.
Direct Finite Element Model Generation using 3 Dimensional Scan Data
Lee Su-Young ; Kim Sung-Jin ; Jeong Jae-Young ; Park Jong-Sik ; Lee Seong-Beom ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 143~148
It is still very difficult to generate a geometry model and finite element model, which has complex and many free surface, even though 3D CAD solutions are applied. Furthermore, in the medical field, which is a big growth area of recent years, there is no drawing. For these reasons, making a geometry model, which is used in finite element analysis, is very difficult. To resolve these problems and satisfy the requests of the need to create a 3D digital file for an object where none had existed before, new technologies are appeared recently. Among the recent technologies, there is a growing interest in the availability of fast, affordable optical range laser scanning. The development of 3D laser scan technology to obtain 3D point cloud data, made it possible to generate 3D model of complex object. To generate CAD and finite element model using point cloud data from 3D scanning, surface reconstruction applications have widely used. In the early stage, these applications have many difficulties, such as data handling, model creation time and so on. Recently developed point-based surface generation applications partly resolve these difficulties. However there are still many problems. In case of large and complex object scanning, generation of CAD and finite element model has a significant amount of working time and effort. Hence, we concerned developing a good direct finite element model generation method using point cloud's location coordinate value to save working time and obtain accurate finite element model.
Finite Element Analysis of Residual Stress by Cold Expansion Method with Clamping Force in the Plate having Adjacent Holes
Yang Won-Ho ; Cho Myoung-Rae ; Jang Jae-Soon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 149~154
The cold expansion method (CEM) is one of the widely used a method to improve the fatigue behavior of materials in aerospace industry. Such improvement is due to the compressive residual stress developed when a tapered mandrel goes through the fastener holes a little smaller than the mandrel. CEM is retarded of crack initiation due to the compressive residual stress developed on the hole surface. Many researchers are studied a finite element analysis of residual stress around fastener hole. But in case of real model, fastener hole has a clamping force after CE. Therefore, it is respected that residual stress distributions should be changed due to clamping forces. In this paper, it was performed finite element analysis of residual stress by clamping force after CE in the plate having adjacent holes. From this study, it has been found that compressive residual stress near the hole increases according to clamping force. Also, the more increase clamping force, the more increases compressive residual stress. However, tensile residual stress increase beyond clamping force area.
Mechanical Design and Evaluation of Linear Tape Feeder for Chip Mounter
Lee Soo-Jin ; Kang Sung-Min ; Lee Chang-Hee ; Kim Yong-Yun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 155~161
This paper introduces a new type of mechanical tape feeder for chip mounter. The mechanical feeder is composed of a pneumatic linear actuator and a linear feeding module with the application of a cam-slider. As semiconductor chips are getting smaller, PCB assembly makers require the feeder to position the chip with high accuracy. The linear feeding system improves the positioning accuracy of the chip by getting rid of the index error, which brings into existence on the sprocket rotating feeder. It also can make greatly reduce the dumping rate. The dumping error is caused by the impact occurred as the pawl to interrupt ratchet wheel rotation. The paper discusses its mechanism and mechanical performance. The positioning accuracy and the dynamic characteristic were measured for long time operation and analyzed. As a result, the feeder showed very good performance. However, the feeding system was dynamically unstable due to the cover film eliminator that is required to be modified
A Study on the Method of Residual Stress Relaxation during Wire Drawing and Evaluation of Residual Stress Using Nano Indentation Test
Ko Dae-Cheol ; Hwang Won-Ho ; Lee Sang-Kon ; Kim Byung-Min ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 162~169
Steel cord which is used as reinforcement in car tires is produced by wet-drawing process. Recently the quality improvement of the steel cord product is demanded by the tire market. After cold drawing process, produced residual stresses have a harmful effect on the durability of the wire and become the cause which decreases the quality of the product. Therefore, to improve the quality of the steel cord product, the research regarding the method of residual stress relaxation is necessary. To evaluate the quality of the cold drawn wire, it is very important to measure the residual stress, because the residual stress decides a variety of the quality level which is demanded in the cold drawn wire. The aim of this study is to propose residual stress relaxation method in the drawn wire using FE-analysis. The validity of the analysis results was verified by Nano indentation test.
Fracture Mechanism of Ceramic/Glass-fiber-reinforced-composites Laminate by High Velocity Impact
Jung Woo-Kyun ; Lee Woo-Il ; Kim Hee-Jae ; Kwon Jeong-Won ; Ahn Sung-Hoon ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 170~176
Multi-layered laminate made of ceramic/composite have been developed to prevent penetration by high velocity impact. In this study, three-layered plates consisted of 1) cover layer (glass fiber reinforced polymer), 2)
, ceramic plate, and 3) backing plate (glass fiber reinforced polymer) were fabricated with various conditions and tested for their ballistic protection characteristic. The ceramic composite laminates, with thin backing plate, were completely penetrated by armor piercing projectile. The plate with inserted rubber between ceramic and backing plate showed excellent ballistic protection, though completely penetrated by the second shoot.
A Study on the Performance Analysis for a Tape Feeder with Cam-slider Mechanism
Jeon Byung-Cheol ; Cho Myeong-Woo ; Moon Chan-Young ; Lee Soo-Jin ; Choi Jin-Hwa ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 177~183
A tape feeder is an important feeding device to supply micro-chips such as 1005 and 0603 components to PCB in SMT process. Traditionally, tape feeding methods using sprocket wheel mechanism has been used for the pickup system of chip-mounters. However, there is growing needs for new feeding mechanism with high accuracy and confidence as electric components are getting much smaller. Thus, recently, a tape feeder using cam-slider mechanism is developed to meet such requirements. The major advantages of developed system are; significantly reduced indexing and backlash errors, slim and compact design, and improved repetitive capacity compared to existing system. In this paper, the performance evaluation criteria for the developed tape feeder are suggested. Stability against induced vibration, positioning accuracy, cycle time, durability and supply error rate are estimated using developed self testers. As a result, the excellence of developed tape feeding mechanism is validated using the effective rating methods.
A Study on the Reliability Analysis for a Linear Type Pneumatic Actuator with Cross Roller Guide
Shin Bong-Cheol ; Cho Myeong-Woo ; Kang Sung-Min ; Lee Soo-Jin ; Choi Jin-Hwa ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 184~189
This research presents the performance analysis of the linear type pneumatic actuators that are used in semi-conductor assembly line to transfer some product with high accuracy. To increase positioning and repetitive accuracies, a cross roller guide is implemented inside the pneumatic actuator. The finite element method is used to verify the force against working moments, and reliability analysis is performed to classify the breakdown cases. Also, reliability, failure rate, probability density function, and
to life are estimated under the boundary of thrust or air leakage conditions. In this study, the failure probabilistic function of the pneumatic actuators is analyzed using Weibull distribution.
Micromachining Characteristics inside Transparent Materials using Femtoseocond Laser Pulses
Nam Ki-Gon ; Cho Sung-Hak ; Chang Won-Seok ; Na Suck-Joo ; Whang Kyung-Hyun ; Kim Jae-Gu ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 5, 2006, Pages 190~196
Transparent materials are widely used in the fields of optic parts and bio industry. We have experiment to find out the characteristics of the micromachining inside transparent materials using femtosecond laser pulses. With its non-linear effects by very high peak intensity, filament (plasma channel) was formed by the cause of the self-focusing and the self-defocusing. Physical damage could be found when the intensity is high enough to give rise to the thermal stress or evaporation. At the vicinity of the power which makes the visible damage or modification, the structural modification occurs with the slow scanning speed. According to the polarization direction to the scanning direction, the filament quality is quite different. There is a good quality when the polarization direction is parallel to the scanning direction. For fine filament, we could suggest the conditions of the high numerical aperture lens, the short shift of focusing point, the low scanning speed and the low power below 20 mW. As the examples of optics parts, we fabricated the fresnel zone plate with the
diameter and Y-bend optical wave guide with the