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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
Editor in Chief :
Volume & Issues
Volume 26, Issue 12 - Dec 2009
Volume 26, Issue 11 - Nov 2009
Volume 26, Issue 10 - Oct 2009
Volume 26, Issue 9 - Sep 2009
Volume 26, Issue 8 - Aug 2009
Volume 26, Issue 7 - Jul 2009
Volume 26, Issue 6 - Jun 2009
Volume 26, Issue 5 - May 2009
Volume 26, Issue 4 - Apr 2009
Volume 26, Issue 3 - Mar 2009
Volume 26, Issue 2 - Feb 2009
Volume 26, Issue 1 - Jan 2009
Selecting the target year
Development of Wearable Robot System based the Analysis of the Lower Limbs
Jang, Jae-Ho ; Lee, Hee-Don ; Jang, Hye-Yoen ; Han, Jung-Soo ; Han, Chang-Soo ; Shon, Woong-Hee ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 7~14
Optical Muscle Activation Sensor for Bionic Applications
Han, Hyo-Nyoung ; Kwon, Sun-Cheol ; Kim, Jung ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 15~21
Numerical Study of Deep Vein Thrombolysis-The effect of hole arrangement
Jeong, Woo-Won ; Rhee, Kye-Han ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 22~30
Evaluation of Mechanical Stability in Development of Customized Hip Implant
Kim, Hyung-Jin ; Kim, Jung-Sung ; Han, Sung-Min ; You, Jung-Hoon ; Choi, Kwi-Won ; Youn, In-Chan ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 31~37
Analysis of the Bonding Strength between PCM and Chondrocyte Using FEM
Choi, Jae-Bong ; Han, Jung-Soo ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 38~43
Experimental Investigations into the Precision Cutting of High-pressured Jet for Thin Multi-layered Material
Park, Kang-Su ; Bahk, Yeon-Kyeung ; Lee, Jung-Han ; Lee, Chae-Moon ; Go, Jeung-Sang ; Shin, Bo-Sung ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 44~50
High-pressured jetting is now widely used in the advanced cutting processes of polymers, metals, glass, ceramics and composite materials because of some advantages such as heatless and non-contacting cutting. Similarly to the focused laser beam machining, it is well known as a type of high-density energy processes. High-pressured jetting is going to be developed not only to minimize the cutting line width but also to achieve the short cutting time as soon as possible. However, the interaction behavior between a work piece and high-velocity abrasive particles during the high-pressured jet cutting makes the impact mechanism even more complicated. Conventional high-pressured jetting is still difficult to apply to precision cutting of micro-scaled thin work piece such as thin metal sheets, thin ceramic substrates, thin glass plates and TMM (Thin multi-layered materials). In this paper, we proposed the advanced high-pressured jetting technology by introducing a new abrasives supplying method and investigated the optimal process conditions of the cutting pressure, the cutting velocity and SOD (Standoff distance).
Noise Attenuation Effect According to the Direction of Canceling Speaker in Duct-acoustic System
Lee, Hyung-Seok ; Lee, Eung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 51~57
In this paper, we studied on an attenuation effect of automobile exhaust noise according to the direction of canceling speaker in duct-acoustic ANC system. Automobile exhaust noise was recorded at 800rpm, 3500rpm and 5000rpm of a diesel engine. Directions of canceling speaker can be set to
against the primary noise flow by acrylic ducts to be made for the experimentation. DSP board used to control the ANC system. The algorithm of this ANC system applied the Filtered-x-LMS algorithm that is modified to compensate for a property of DSP input signal and the secondary-path effect. As an experiment result, the direction of canceling speaker was proved to influence the reduction effect of noise. The
duct in the attenuation effect of noise showed a better result than the
A Study on the Optimal Condition Determination of Laser Scattering Using the Design of Experiment
Han, Jae-Chul ; Kim, Gyung-Bum ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 58~64
In this paper, an inspection mechanism based on laser scattering has been developed for the surface evaluation of infrared cut-off filters, and optimum conditions of laser scattering are determined using the design of experiment. First of all, attributes and influence factors of laser scattering are investigated and then a laser scattering inspection mechanism is newly designed based on analyses of laser scattering parameters. Also, Taguchi method, one of experimental designs, is used for the optimum condition selection of laser scattering parameters and the optimum condition is determined in order to maximize the detection capability of surface defects. Experiments show that the proposed method is useful in a consistent and effective defect detection and can be applied to surface evaluation processes in manufacturing.
Research about ESPI System Algorithm Development that Use Modulating Laser
Kim, Seong-Jong ; Kang, Young-June ; Park, Nak-Kyu ; Lee, Dong-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 65~72
Laser interferometry is widely used as a measuring system in many fields because of its high resolution and its ability to measure a broad area in real-time all at once. In conventional laser interferometry, for example out-of-plane ESPI (Electronic Speckle Pattern Interferometry), in plane ESPI, shearography and holography, it uses PZT or other components as a phase shift instrumentation to extract 3-D deformation data, vibration mode and others. However, in most cases PZT has some disadvantages, which include nonlinear errors and limited time of use. In the present study, a new type of laser interferometry using a laser diode is proposed. Using Laser Diode Sinusoidal Phase Modulating (LD-SPM) interferometry, the phase modulation can be directly modulated by controlling the laser diode injection current thereby eliminating the need for PZT and its components. This makes the interferometry more compact. This paper reports on a new approach to the LD (Laser Diode) Modulating interferometry that involves four-frame phase shift method. This study proposes a four-frame phase mapping algorithm, which was developed to have a guaranteed application, to stabilize the system in the field and to be a user-friendly GUI. In this paper, the theory for LD wavelength modulation and sinusoidal phase modulation of LD modulating interferometry is shown. Using modulating laser and research of measurement algorithm does comparison with existent ESPI measurement algorithm. Algorithm measures using GPIB communication through most LabVIEW 8.2. GPIB communication does alteration through PC. Transformation of measurement object measures through modulating laser algorithm that develops. Comparison of algorithm of modulating laser developed newly with existent PZT algorithm compares transformation price through 3-D. Comparison of 4-frame phase mapping, unwrapping, 3-D is then introduced.
Complete Coverage Path Planning for Multi-Robots
Nam, Sang-Hyun ; Shin, Ik-Sang ; Kim, Jae-Jun ; Lee, Soon-Geul ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 73~80
This paper describes a path planning algorithm, which is the minimal turning path based on the shape and size of the cell to clean up the whole area with two cleaning robots. Our method divides the whole cleaning area with each cell by cellular decomposition, and then provides some path plans among of the robots to reduce the rate of energy consumption and cleaning time of it. In addition we suggest how to plan between the robots especially when they are cleaning in the same cell. Finally simulation results demonstrate the effectiveness of the algorithm in an unknown area with multiple robots. And then we compare the performance index of two algorithms such as total of turn, total of time.
A Study on the Reliability of a Dual Capacity Reciprocating Compressor
Kim, Jong-Bong ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 81~90
Due to environmental issues, the development of low energy consumption products has become one of the main topics in the home appliance industry. The energy consumption of a refrigerator depends on the efficiency of its compressor as well as on the refrigerator cycle design, such as the capacity modulation. In this study, a dual capacity, i.e., two-step capacity modulation (TCM), reciprocating compressor is developed. In a TCM compressor, capacity modulation is achieved by changing the dead volume in the cylinder. Instead of a concentric sleeve, an eccentric sleeve, a key, and a spring are used to change the dead volume for the clockwise and counterclockwise rotation of a motor. When the compressor changes its operating mode from full capacity to partial capacity or in opposite direction, the key may collide with the eccentric sleeve. The structural reliability and mode change reliability were confirmed by analysis and experiment.
Measurement Method for Tensile Properties of PDP's Barrier Rib Materials
Oh, Chung-Seog ; Bae, Jong-Sung ; Hong, Byung-Gyu ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 91~98
A reliable tensile test technique for PDP's barrier rib materials was introduced. A tensile specimen was prepared by punching out of green sheet, curing the specimen in a high temperature furnace, attaching sand paper tabs on each grip ends, and then attaching two strain gages for the strain monitoring and specimen alignment. Preliminary tensile tests were successfully done with the specimens made from ZnO-based lead-free green sheet. The specimens cured at 3 different maximum curing temperatures were tested to demonstrate the applicability of the test method. The Young's modulus was 88
4 GPa regardless of the maximum curing temperature. The ultimate tensile strength was decreased with increasing the temperature. The tensile test method proposed in this study was proven to be reliable, useful and easy to estimate the bulk mechanical properties of barrier rib materials.
Creep Characteristic of the Polyethylene(PE) at Various Stresses and Temperatures
Kang, Suk-Choon ; Lee, Young-Won ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 99~104
Creep characteristic is an important failure mechanism when evaluating engineering materials that are soft as polymers or used as mechanical elements at high temperatures. One of the popular thermo-elastic plastics, Polyethylene(PE) which is used broadly for engineering purposes, as it has good properties and merits compared to other plastics, was studied for creep characteristic at various level of stresses and temperatures. From the experimental results, the creep limit of PE at room temperature is 75% of tensile strength. Also the creep limits decreased exponentially as the temperatures increased, up to 50% of the melting point. Also the secondary stage among the three creep stages was nonexistent nor was there any rupture failure which occurred for many metals.
Fatigue and Robust Analysis for Improving the Suspended Pedal of Vehicles
Lee, Woo-Hyung ; Hwang, Bum-Chul ; Kim, Chul ; Bae, Won-Byong ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 105~111
This study was carried out to evaluate structural stability of the suspended plastic pedal used in vehicles and to predict its fatigue life with the results obtained from finite element analysis. And also shape optimization was performed to reduce its weight. Structural analysis of the suspended plastic pedal was based on the evaluation tests such as static test, stiffness test, and fatigue test in the actual field, which were frequently carried out in the companies manufacturing plastic pedals. The evaluation for the plastic pedal was carried out by structural and fatigue analyses using a commercial FEA program and according to it, maximum stress and strain and fatigue life of the pedal satisfied all the requirements in the evaluation tests. The results of structural analysis of the suspended plastic pedal were used in the fatigue analysis. Fatigue test was performed to verify validity of the theoretical fatigue life of the plastic pedal. And the life by theoretical calculation was in good agreement with that by the experiment. Object function for optimizing shape of the plastic pedal is its volume, and total volume of the plastic pedal was reduced to about 11.7% through shape optimization.
The Supplement of Sn/Cu, Plating Solution Affects in Plating Skim Quality of the Plating Product
Jeon, Taeg-Jong ; Ko, Jun-Bin ; Lee, Dong-Ju ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 112~119
The purpose of this study is to evaluate the evaluation of process yield performed by using Sn & Cu treatment on the surface to optimize process condition for Lead-free solder application. The materials which are used for the New Surface Treatment study are Semi-Dulling plating for high speed Sn/Cu alloy of Soft Alloy GTC-33 Pb free known as "UEMURA Method" and plating substrate is alloy 42.Especially in lead-free plating process, it is important to control plating thickness and Copper composition than Sn/Pb plating. Evaluated and controlled plating thickness
, Copper composition
, plating particle and visual inspection. The optimization of these parameters and condition makes it makes possible to apply Sn/Cu Lead-free solder from Sn/Pb alloy.
Thermal Characteristics Analysis of 30,000rpm High Speed Spindle
Lim, Jeong-Suk ; Yu, Ki-Han ; Chung, Won-Jee ; Kim, Soo-Tae ; Lee, Jung-Hwan ; Lee, Choon-Man ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 120~126
Thermal displacement of high speed spindle is very important problem to be solved. To solve heat generation and thermal displacement problems that influence on the product accuracy, it is very important to predict thermal characteristics of the spindle and it is positively necessary to select the conditions of cooling, flow rate and preload of bearings. In this paper, 30,000rpm(
) spindle was designed and produced. The analysis of thermal deformation for heat generation of inner spindle was carried out using commercial program
and the result was compared with measured data using
and SGXI-1600, 1125 and 1126 module. Temperature distribution and thermal displacement according to spindle speed are measured. Using this method, it is possible to predict and to improve thermal characteristic of high speed spindle by control spindle speed, bearing preload and cooling rate.
Development of 3-DOF Parallel Manipulator Using Flexure Hinge
Shin, Dong-Ik ; Kim, Young-Soo ; Suh, Seung-Whan ; Han, Chang-Soo ; Choi, Doo-Sun ; Whang, Kyung-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 127~133
We present a
compliant parallel manipulator actuated by PZTs. The motion ranges are
translation to the z-direction and 5.7-mrad rotation about any axis on the x-y plane. A mechanical amplifier whose advantage is approximately 5.5 is designed and integrated with flexure revolute and spherical joints in a monolithic way. We evaluated the performance of the system: kinematic and dynamic characteristics. In kinematic point of view, the flexures play the roles of conventional mechanism but any nonlinearity such as dead-zone and backlash, which make it possible to achieve the steady-state resolution less than
. The system shows resonance near 86 Hz with high magnitude and, therefore, poor transient response. But the settling is faster when the flexures are strained higher.
Redundant Design of Wearable Robot Mechanism for Upper Arm
Lee, Young-Su ; Hong, Sung-Jun ; Jang, Hye-Yeon ; Jang, Jae-Ho ; Han, Chang-Su ; Han, Jung-Su ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 134~141
Recently, many researchers have tried to develop wearable robots for various fields such as medical and military purposes. We have been studying robotic exoskeletons to assist the motion of persons who have problems with their muscle function in daily activities and rehabilitation. The upper-limb motions (shoulder, elbow and wrist motion) are especially important for such persons to perform daily activities. Generally for shoulder motion 300F is needed to describe its motion(extension/flexion, abduction/adduction, internal/external rotation) but we have used a redundant actuator thus making a 4 DOF system. In this paper, we proposed the mechanism design of the exoskeleton which consists of 4-DOF for shoulder and 1-DOF for elbow robotic exoskeleton to assist upper-limb motion. Then we compared the new mechanism design and prototype mechanism design. Here we also analyze the proposed system kinematically to find out and to avoid the singular point. This research will ensure that the proposed wearable robot system make human's motion more powerfully and more easily.
Quantitative Evaluation of Spasticity through Separation of Reflex and Mechanical Component Related to Spasticity in Hemiplegic Patients
Kim, Chul-Seung ; Eom, Gwang-Moon ; Kim, Ji-Won ; Ryu, Je-Chung ; Kang, Sung-Jae ; Kim, Yo-Han ; Park, Byung-Kyu ;
Journal of the Korean Society for Precision Engineering, volume 26, issue 7, 2009, Pages 142~149
The aim of this study was to identify both the mechanical and reflex properties associated with spasticity in hemiplegic patients. Ten hemiplegic patients were included in this study. Multiple pendulum tests were executed for each subject, and knee joint angle and EMG of Rectus Femoris muscle were measured. The neuromusculoskeletal system model was developed from generally accepted mechanism and identified through minimization of the error in the model-predicted pendulum trajectories. The identification was successful in terms of small error in simulated kinematics and high sensitivity and precision of simulated torque against EMG activity. The reflex threshold showed significant difference between different clinical scores (p<0.01) and significant negative correlation (r=-0.93) with the EMG duration. It is expected that the suggested method may help in understanding mechanisms underlying spasticity.