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김한솔(Han-Sol Kim),이경준(Kyung-Jun Lee),정동연(Dong-Yean Jung),이연형(Yeon-Hyeong Lee),박재현(Jea-Hyun Park),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.18 No.1
This paper describes the design for a defective product inspection device for the curved glass used in smart-phone. Cameras are used as inspection devices to find cracks in LCDs (Liquid Crystal Displays), PDPs (Plasma Display Panels), etc. The devices used to inspect the curved glass used in smart-phone consist of a camera, two back-light apparatus, an inspection apparatus main body, and an image processing program. Camera image calibration was performed to smooth an image taken with the camera, and as a result, the average error was less than 0.12 pixels. And the image of a smart-phone"s curved glass taken with the camera was processed using the produced program. As a result, the program could correctly extract the cracks on the curved glass. Thus, it is thought that the designed inspection device can successful detect cracks in curved tempered glass.
김한솔(Han-Sol Kim),이경준(Kyung-Jun Lee),정동연(Dong-Yean Jung),이연형(Yeon-Hyeong Lee),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.12
This paper describes the design of a cellphone curved glass measuring device using by camera. The measuring device was composed of two camera, two backlight system, a body and so on, and the program was made for a camera calibration and noise removal, and also the program was made for height measurement of a cellphone curved glass using by subpixel algorism. And then a new technique for measuring the height of the cell phone curved glass was proposed. The characteristics test of height measurement of gage blocks and cell phone curved glasses was carried out, the error of the height measurement of gage block is less than ±0.005 and the error of the height measurement of the cell phone curved glasses is less than ±0.005. Thus it thought that the designed cellphone curved glass measuring device and the new technique for measuring the height was used to measure the height of the cellphone curved glass.
김한솔,이경준,정동연,이연형,박재현,김갑순,Kim, Han-Sol,Lee, Kyung-Jun,Jung, Dong-Yean,Lee, Yeon-Hyeong,Park, Jea-Hyun,Kim, Gab-Soon 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.8
This paper describes the design for a defective product inspection device for the curved glass used in smart-phone. Cameras are used as inspection devices to find cracks in LCDs (Liquid Crystal Displays), PDPs (Plasma Display Panels), etc. The devices used to inspect the curved glass used in smart-phone consist of a camera, two back-light apparatus, an inspection apparatus main body, and an image processing program. Camera image calibration was performed to smooth an image taken with the camera, and as a result, the average error was less than 0.12 pixels. And the image of a smart-phone's curved glass taken with the camera was processed using the produced program. As a result, the program could correctly extract the cracks on the curved glass. Thus, it is thought that the designed inspection device can successful detect cracks in curved tempered glass.
윤지현,김규호 한국문화재보존과학회 2016 보존과학회지 Vol.32 No.1
본 연구는 거창 정장리 유적에서 복원이 불가능한 유리구슬 편 24점과 완형 유리구슬 26점에 대하여 형태적 특성 관찰과 화학 조성 분석을 통해 재질 및 특성을 밝히고자 하였다. 유리구슬의 형태적 특성은 색상, 크기, 풍화 상태, 제작 기법에 따라 크게 다섯 가지 유형으로 구분된다. 화학 조성에 따른 분류에서 첫 번째와 두 번째 유형은 소다유리군, 세 번째 유형은 포타쉬유리군, 네 번째와 다섯 번째 유형은 납바륨유리군으로 확인된다. 이를 통해 거창 정장리 유적의 유리구슬은 형태적 특성에 따라 화학 조성이 변화되는 양상을 보이며 다양한 화학 조성이 확인되었다. 본 유적의 유리 문화의 흐름을 살펴보면 납바륨유리군 II형과 포타쉬유리군 I, II형이 나타나는 유구는 비교적 선행 시기인 목곽묘 단계, 소다유리군과 납바륨유리군 III형이 나타나는 유구는 비교적 후행 시기인 목곽묘 단계의 유리 문화가 형성된 것으로 추정할 수 있다. This study defined material and characteristics of 24 glass fragments and 26 whole glass beads. The feature of glass beads shape are divided into 5 types following color, size, weathering condition and manufacturing techniques. Through the chemical composition, the first and second type is soda glass, the third type is potash glass, the fourth and fifth type is lead barium glass. This site showed the aspect that the chemical composition is changed according to the feature of glass shape and was found that various chemical compositions. Looking at the flow of glass culture, the tomb that are lead barium glass IItype and potash glass I, IItype is relatively preceding period and the tomb that are soda glass and lead barium glass IIItype is following period.
모바일 Smart 기기용 덮개유리 성형시스템의 온도해석과 실험의 비교에 관한 연구
신환준(Hwan June Shin),이준경(Jun Kyoung Lee),방영준(Young Jun Bang),이관근(Kwan Geun Lee),정동연(Dong Yean Jung),이연형(Yean Hyeong Lee),박재현(Jae Hyun Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Nowadays flat shaped cover glass was widely used for mobile devices. But for good design and convenience, curved cover glass is demanded. Thus many companies try to produce curved cover glasses by shaving technique, but the production efficiency is very low. Therefore, the molding technique has been adopted to increase the efficiency for curved glass production system. For a glass molding system, the uniform temperature distribution of the mold must be needed to produce high quality curved cover glass. Before suggesting heating conditions of the molding system for uniform temperature distribution by the thermal analysis, the verification should be required. Therefore, in this study, the temperature measurements were performed for the prototype molding system and the experimental results were compared with the computations. The temperatures on the heating block surface were in good agreement with the computational results for transient and steady conditions.
C. H. Song,M. Kim,최현우,Y. H. Kim,양용석 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
We have investigated the composition dependences of the thermal and the electrical properties in lithium-potassium-niobium-silicate (2(Li1−xKx)NbO3-SiO2) glasses. Glass samples were prepared by using a twin roller quenching method. Differential thermal analysis was used to measure the thermal characteristics, and electrical measurements were carried out in the frequency range from 102 Hz to 1.5 × 107 Hz. The frequency dependence of the electrical data was analyzed in the frameworks of the electrical modulus and the complex impedance formula. We found, from the thermal analysis, that the characteristic temperature for the crystallization of the glass varied nonlinearly with the composition. The composition dependence of the dc resistivity and the activation energies of the dc and the ac electrical conductivities obtained both from the impedance Cole-Cole formula and the modulus analysis also showed nonlinear behaviors. The composition-dependent scaling plots for the imaginary part of the electrical modulus at a selected temperature overlapped on a single master curve, irrespective of the composition.
Impedance Analysis and Low-Frequency Dispersion Behavior of Bi4Ti3O12 Glass
C. H. Song,M. Kim,S. M. Lee,최현우,양용석 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
We have studied the frequency- and the temperature-dependent dielectric relaxation for the Bi4Ti3O12 glass. The frequency dependence of the electrical data has been analyzed in the frameworks of the impedance Cole-Cole formalism and the universal power law. We have found that the frequency-dependent dielectric properties exhibit low-frequency dispersion and that the relaxation behavior is far from a Debye-type behavior. The similar values of the ac and the dc activation energies of the electrical conduction from two different models, the complex impedance formula and the power law, indicate that the activation energy is an appropriate parameter for explaining the electrical relaxation and conduction mechanisms. The frequency-dependent conductivities overlap on a single master curve, irrespective of temperature, in the glass region, implying the existence of a universal ionic relaxation process in this glass system.
Effect of stress ratio on fatigue life of GFRP composites for WT blade
Yong-Hak Huh,Jae-Hyun Lee,Dong-Jin Kim,이영신 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.7
Fatigue life of GFRP (glass-fiber reinforced plastic) composites used in wind turbine rotor blades has been evaluated considering the glass fiber orientations. Three different laminate composites with the respective laminating orientation of 0°, ±45°, and 0°±45° were prepared using vacuum infusion method. Tensile properties and S-N curves for these composites were experimentally determined at room temperature. From the tensile tests, it was found that tensile properties were greatly dependent upon the fiber orientation and the tensile strength of unidirectional composite was the largest and bidirectional (45°) composite was the weakest among three composites. The fatigue properties were determined under constant amplitude load control at different stress ratios, R, of 0.5, 0.1 and -0.2. The properties also show the dependency of stress ratios and fiber orientation. The fatigue life diagrams of these three composite were relatively well presented with the double logarithmic S-N curve. The linear slopes of the respective S-N curves for three composite were not greatly different. The fatigue limits for the composites were evaluated and predicted with linear Goodman and Gerber diagrams.
PbO-TiO$_2$-B$_2$O$_3$-BaO 계 유리에서 PbTiO$_3$ 결정의 핵생성 곡선 결정을 위한 열시차분석법의 응용
이선우,심광보,오근호 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.6
PbO-TiO2-B2O3-BaO계 유리에서 PbTiO3의 핵생성 및 결정화를 위한 최적조건의 확입을 위해 핵생성 속도 곡선을 도출하고자 열시차 분석법(DTA)을 응용하였다. PbTiO3의 함량비가 60mol%인 4성분계 유리 샘플은 용융액으로부터 자연 냉각시켜 제조되었으며, 핵생성을 위해 유리 샘플은 40$0^{\circ}C$와 50$0^{\circ}C$ 사이에서 열처리하였다. 이때 46$0^{\circ}C$에서 핵생성 속도가 최대값을 나타내었다. DTA의 결정화 피크 온도는 핵생성을 위한 열처리시간이 증가함에 따라 감소하였으며, DTA의 승온속도에 비례하여 증가하였다. 이러한 결과는 계에 생성된 핵의 밀도가 핵생성 처리온도와 시간의 증가에 따라 증가함을 보여주고 있다. Nucleation and crystallzation of a quaternary glass system for lead titanate glass-ceramics were in-vestigated using DTA(differential thermal analysis ) with variation of nucleation temperature and crystal growth time. Glass samples containing 60mol% of PbO-{{{{ { TiO}_{2 } }} were prepared from melts by the conventional normal cooling method in a cylindrical brass mould. The glass sample was nucleated between 40$0^{\circ}C$ and 50$0^{\circ}C$ for a given time and showed the maximum nucleation rate at 46$0^{\circ}C$ The DTA crystallization peak temperature decreased with increasing nucleating time and decreasing heating rate during DTA runs which indicated an increase of the number of nuclei produced in the system.