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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.
위험도분석을 통한 이단횡단보도와 일반횡단보도의 비교평가
김태호,박제진,이연형,노정현,Kim, Tae-Ho,Park, Jun-Tae,Lee, Yeon-Hyung,Rho, Jeong-Hyun 대한토목학회 2015 대한토목학회논문집 Vol.35 No.6
본 연구는 간선도로 상의 이단횡단보도와 일반횡단보도를 비교대상으로 하여 차량 및 보행자 행태분석을 통해 요인을 추출하고, 보행자의 심리적 부담감이라는 정성적 요소를 포함하여 위험도(Risk Analysis)를 비교하고자 한다. 국내 외 선행 연구고찰을 통해 이단횡단보도의 연구방향을 제시하고, 횡단보도(일반, 이단)에서 차량과 보행자의 위반행태 및 전문가 설문을 통하여 위험도 평가항목 및 구조를 정립하였다. 보행자가 느낄 수 있는 심리적 부담감과 같은 정성적 평가항목을 반영하기 위하여 계층분석법(AHP : Analytic Hierarchy Process)을 통한 가중치(Weight)를 산정하고, 조사내용을 종합 점수화하여 위험도 분석을 수행하였다. 이단횡단보도와 일반횡단보도의 위험도 평가결과, 정량적 요소 측면에서는 차량위반 항목에 대해 이단횡단보도(0.318)가 일반횡단보도(0.241)에 비해 높게 나타났으며, 보행자 위반 항목에 대해 일반횡단보도(0.241)가 이단횡단보도(0.130)보다 높게 나타나 정량적 요소에 따른 상대적 위험도는 일반횡단보도(0.482)가 이단횡단보도(0.448)보다 1.08배 높은 것으로 분석되었다. 다만, 보행자의 심리적 부담감이라는 정성적 요소를 포함하면 일반횡단보도(0.503)가 이단횡단보도(0.462)의 상대적 위험도 보다 1.09배 높은 것으로 분석되어 보행자의 심리적 불안감을 포함하더라도 간선도로 단일로 상에 설치된 이단횡단보도가 일반횡단보도 보다 다소 안전한 것으로 나타났다. This research is the study on the comparative evaluation of SPC (Staggered Pedestrian Crossings) vs PC (Pedestrian Crossings) using risk analysis. Accident factor was elicited by survey of driver's and pedestrian's at SPC & PC. I estimated the weight of a risk of violation and a mental burden by AHP (Analytic Hierarchy Process) and compared degree of risk at SPC AND PC. In conclusion, a new alternative plan of a pedestrian crossing system, staggered pedestrian crossing which plays an important role in traffic flow, pedestrian's crossings which plats an important role in traffic flow, pedestrian's convenience and traffic safer is sager than pedestrian crossings the degree of risk used this study doesn't imply an measure of the number of accident and the rate of accident, in estimating the degree of risk of pedestrian crossings, we should analyze more data of accident, behaviors, and road circumstance to include driver's and pedestrian's violation behavior in an estimate index.
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.