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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 31, Issue 12 - Dec 2014
Volume 31, Issue 11 - Nov 2014
Volume 31, Issue 10 - Oct 2014
Volume 31, Issue 9 - Sep 2014
Volume 31, Issue 8 - Aug 2014
Volume 31, Issue 7 - Jul 2014
Volume 31, Issue 6 - Jun 2014
Volume 31, Issue 5 - May 2014
Volume 31, Issue 4 - Apr 2014
Volume 31, Issue 3 - Mar 2014
Volume 31, Issue 2 - Feb 2014
Volume 31, Issue 1 - Jan 2014
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Fabrication Method of Metal Grid Mesh Film Using the Gravure Offset Printing
Kim, Jung Su ; Kim, Dong Soo ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 969~974
DOI : 10.7736/KSPE.2014.31.11.969
Previously fabricated electronic devices were used for vacuum manufacturing processes such as conventional semiconductor manufacturing. However, they are difficult to apply to continuous processes such as roll-to-roll printing, which results in very high device manufacturing and processing costs. Therefore, many developers have been interested in applying continuous processes to contact printing or noncontact printing technologies and they proposed various continuous printing techniques instead of conventional batch coating. In this paper, we proposed improved gravure offset printing process as one of the contact printing technique. We used etching pattern geometry with soft core blanket roll for printing of ultra fine line below the 10um.Using this technique we obtained flexible metal grid mesh film as transparent conductive film.
Fabrication of Transparent Conductive Film for Flexible Devices Using High-Resolution Roll Imprinting
Yu, Jong-Su ; Yu, Semin ; Kwak, Sun-Woo ; Kim, Jung Su ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 975~979
DOI : 10.7736/KSPE.2014.31.11.975
Transparent conductive films (TCF) with excellent electrical properties and high mechanical flexibility have been widely studied because of their potential for application in optoelectronic devices such as light-emitting diodes, paper displays and organic solar cells. In this paper, we report on low-resistance and high-transparent TCF for flexible device applications. To fabricate a high-resolution roll imprinted TCF, the following steps were performed: the design and manufacture of an electroforming stamp mold, the fabrication of high-resolution roll imprinted on flexible film, the manufacture of Ag-nano paste which was filled into patterned film using a doctor blade process. Also, we was demonstrated with the successful application(ITO free organic photovoltaic) of the developed flexible TCF.
Measurement of Geometric Properties of Printed Patterns and Evaluation of their Printability
Jeon, Sung Woong ; Kim, Cheol ; Park, Jong-Chan ; Kim, Dong Soo ; Kim, Chung Hwan ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 981~986
DOI : 10.7736/KSPE.2014.31.11.981
Printed electronics devices are made of several sets of printed patterns. The quality or printability of the printed patterns determines the electrical performance of such devices. Moreover, control of the printability determines the reliability of such devices. Despite its importance, few studies have been reported for the measurement of the printed patterns to evaluate their printability. In this study, a measurement method is proposed for printed patterns, including the definition of the properties to be measured, and the related software is described. The proposed method measures the width, pinholes, and edge waviness and evaluates the printability of the patterns quantitatively. The proposed measurement method could be an efficient tool to evaluate and enhance the printability of printed patterns in printed electronics.
Improvement of Recognition of Register Errors and Register Control in Roll-to-roll Printing Equipment by Data Compensation
Jeon, Sung Woong ; Park, Jong-Chan ; Nam, Ki-Sang ; Kim, Cheol ; Kim, Dong Soo ; Kim, Chung Hwan ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 987~992
DOI : 10.7736/KSPE.2014.31.11.987
Register control of roll-to-roll printing system for printed electronics requires accurate measurement of register errors. The register marks used for the recognition of patterns position between layers have inherently defects due to low printability of register marks themselves, which brings out inaccurate register accuracy and consequently low performance of printed electronics devices. In this study, the compensation methods for the unrecognized or missing register data are proposed to improve the recognition and consequently the control performance of register accuracy in roll-to-roll printing equipment. The compensation methods using the prior data and the linear interpolation are proposed and compared with the case without compensation for the simulation as well as experiment. Only the linear interpolation method could successfully compensate the missing data and consequently improve the register control performance. We should apply the compensation process of the register errors to improve the register control accuracy in the roll-to-roll printing equipment.
Fabrication of Ag Grid Patterned PET Substrates by Thermal Roll-Imprinting for Flexible Organic Solar Cells
Cho, Jung Min ; Jo, Jeongdai ; Kim, Taeil ; Kim, Dong Soo ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 993~998
DOI : 10.7736/KSPE.2014.31.11.993
Silver (Ag) grid patterned PET substrates were manufactured by thermal roll-imprinting methods. We coated highly conductive layer (HCL) as a supply electrode on the Ag grid patterned PET in the three kinds of conditions. One was no-HCL without conductive PEDOT:PSS on the Ag grid patterned PET substrate, another was thin-HCL coated with ~50 nm thickness of conductive PEDOT:PSS on the Ag grid PET, and the other was thick-HCL coated with ~95 nm thickness of conductive PEDOT:PSS. These three HCLs in order showed 73.8%, 71.9%, and 64.7% each in transmittance, while indicating
each in sheet resistance. Fabrication of organic solar cells (OSCs) with HCL Ag grid patterned PET substrates showed high power conversion efficiency (PCE) on the thin-HCL device. The thick-HCL device decreased efficiency due to low open circuit voltage (
). And the Ag grid pattern device without HCL had the lowest energy efficiency caused by quite low short current density (
Sub-sampling Technique to Improve the Measurement Speed of White Light Scanning Interferometry
Chyun, In-Bum ; Joo, Ki-Nam ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 999~1006
DOI : 10.7736/KSPE.2014.31.11.999
In this investigation, we explain the sub-sampling technique of white light scanning interferometry (WLSI) to improve the measurement speed. In addition to the previous work using Fourier domain analysis, several methods to extract the height from the correlogram of WLSI are described with the sub-sampling technique. Especially, Fourier-inverse Fourier transformation method adopting sub-sampling technique is proposed and the phase compensation technique is verified with simulation and experiments. The main advantage of sub-sampling is to speed up the measurements of WLSI but the precision such as repeatability is slightly poor. In case of measuring the sample which has high height step or difference, the proposed technique can be widely used to reduce the measurement time.
Development on Tandem GMA Welding System using Seam Tracking System in Pipe Line
Lee, JongPyo ; Lee, JiHye ; Park, MinHo ; Park, CheolKyun ; Kim, IllSoo ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 1007~1013
DOI : 10.7736/KSPE.2014.31.11.1007
In this study to improve the productivity, advantage Tandem circumferential weld process of seam tracking system was applied for the laser vision sensor. Weld geometry scanning laser vision sensor and PLC control unit are used to scan correct positioning of welding torch when the program is implemented so that it can correctly track the welding line. The welding experiment was conducted to evaluate the performance of laser vision seam tracking sensor in tandem welding process. The seam tracking several experiments was to determine the reliability of the system, welding experiments relatively good quality welding bead was confirmed. Furthermore, the PLC program for seam tracking was used to confirm the validity of the application of tandem welding process according to the benefits of increased productivity, which is expected to contribute to national competitiveness.
Synchronous Control of Center Distributed Multi-Head Embroidery Machine Using Disturbance Observer
Jeong, Seung Hyun ; Choi, Deuk-Sung ; Park, Jung Il ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 1015~1021
DOI : 10.7736/KSPE.2014.31.11.1015
This paper proposes the center distributed embroidery machine structure with 1,500 RPM, 52 heads for productivity and large sized embroidery goods. The synchronous velocity controller is adopted for control of the 2-axis distributed embroidery machine and the DOB(Disturbance Observer) is also adopted for minimizing disturbances caused by needle cams. For driving experiments of 2-axis center distributed driving structure, two conventional 26 heads 1,500RPM embroidery machines are used. It was shown that the center distributed driving structure with 2-axis synchronous control can be one way for implementing a large embroidery machine.
Formation Control for Swarm Robot using Radius of Curvature
Kang, Dong Woo ; Song, Young Hun ; Lee, Suk ; Lee, Kyung Chang ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 1023~1030
DOI : 10.7736/KSPE.2014.31.11.1023
This paper presents a new method to control swarm robots so that they can keep the formation while following a curved path. The main idea is to utilize the information on the instant center of gyration. For a given path, location of the instant center of the formation center is calculated, and individual robots follow the circular path around the calculated instant center. Performance of curvature-radius based method is compared with leader-follower referenced method via MATLAB simulation.
A Development of Feature Extraction and Condition Diagnosis Algorithm for Lens Injection Molding Process
Baek, Dae Seong ; Nam, Jung Soo ; Lee, Sang Won ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 1031~1040
DOI : 10.7736/KSPE.2014.31.11.1031
In this paper, a new condition diagnosis algorithm for the lens injection molding process using various features extracted from cavity pressure, nozzle pressure and screw position signals is developed with the aid of probability neural network (PNN) method. A new feature extraction method is developed for identifying five (5), seven (7) and two (2) critical features from cavity pressure, nozzle pressure and screw position signals, respectively. The node energies extracted from cavity and nozzle pressure signals are also considered based on wavelet packet decomposition (WPD). The PNN method is introduced to build the condition diagnosis model by considering the extracted features and node energies. A series of the lens injection molding experiments are conducted to validate the model, and it is demonstrated that the proposed condition diagnosis model is useful with high diagnosis accuracy.
Sensitivity Control and Design of the Silicone Foot Sensor Using FEM
Seong, Byuck Kyung ; Seo, Hyung Kyu ; Lee, Jin Wook ; Kwon, Ae-Ran ; Kim, Dong Hwan ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 1041~1050
DOI : 10.7736/KSPE.2014.31.11.1041
A design and analysis for new foot sensor that measures pressure distribution while walking or running in daily life is introduced. In the process of the sensor design, the shape, mechanism composing of the sensor, and variables that dominate sensor's sensitivity are investigated. Through these variables analysis, an optimal shape and dimension were determined. The effects of variables on sensor's sensitivity and the relationship between each variable are proved by analyses and experiments.
The Effects of Functional Electrical Stimulation on Abdominal Obesity Improvement of Adult Women by EMG, Ultrasound and DITI
Lee, Hyun-Ju ; Tae, Ki-Sik ;
Journal of the Korean Society for Precision Engineering, volume 31, issue 11, 2014, Pages 1051~1058
DOI : 10.7736/KSPE.2014.31.11.1051
In this study, we investigated the improvement effect of obesity by treatment with a developed low frequency electrical stimulation system. Thirty female in their 20's as an experiment subjects divided 3 groups(control, commercialized device, developed device) were treated with electrical stimulation on abdomen for 4 weeks. The body weight, body mass index(BMI), waist-hip ratio(WHR), muscle strength, muscle(transverse abdominis(TrA), internal obliquus abdominis(IO), external obliquus abdominis(EO)), fat thickness and abdominal surface temperature were measured by electromyogram(EMG), ultrasound and digital infrared thermal image(DITI). In the result, the body weight and BMI were decreased. Subcutaneous abdominal fat were significantly reduced after 4 weeks. The muscle strength and TrA muscle thickness was increased 13.2%(p<0.05), and 35.5%, respectively. The fat thickness showed decrease in abdomen (p<0.05). Infrared measurement on abdominal surface temperature as a parameter of improvement in blood circulation was significantly increased(p<0.05). Therefore, the low frequency stimulation showed positive effects on parameters of the obesity improvement.