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Evaluation of Healing Effect by Rest Periods on Asphalt Concrete Slab Using MMLS3 and NDE Techniques
이주상,이상염,Y. Richard Kim 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.3
Fatigue life of asphalt concrete pavement is one of the most important factors in pavement management systems, which can be increased by healing effect. The healing effect by rest periods was evaluated by the third scale Model Mobile Loading Simulator (MMLS3) and Nondestructive Evaluation (NDE) techniques. Impact method of stress wave was optimized to accurately analyze the phase velocity and obtain effective sampling depth. In general, the phase velocities decrease as the pavement structure is degraded by the increase of wheel applications or load levels along both of the stress wave and ultra sonic measurement, while the recovery of phase velocities during rest periods is successfully evaluated by both techniques. Finally, based on the observation of phase velocities of waves, it was possible to confirm the healing effect of Asphalt Concrete (AC) by rest periods.
유비쿼터스 이동로봇용 천장 인공표식을 이용한 비젼기반 자위치인식법
이주상,유영재,임영철 한국지능시스템학회 2005 한국지능시스템학회논문지 Vol.15 No.5
In this paper, a practical technique for correction of a distorted image for vision-based localization of ubiquitous mobile robot. The localization of mobile robot is essential and is realized by using camera vision system. In order to wide the view angle of camera, the vision system includes a fish-eye lens, which distorts the image. Because a mobile robot moves rapidly, the image processing should be fast to recognize the localization. Thus, we propose the practical correction technique for a distorted image, verify the performance by experimental test. 본 논문은 유비쿼터스 이동로봇의 자기위치인식에 적용되는 비젼시스템의 왜곡된 영상을 보정하기 위한 실용적인 방법을 제안하다. 이동로봇에서 자기위치인식은 필수적인 요소이며 카메라 비젼시스템을 이용하여 처리 가능하다. 자기위치인식에서 비젼시스템은 넓은 시야를 확보하기 위해 어안렌즈를 이용하는데, 이는 영상의 왜곡을 발생한다. 또한 이동로봇은 지속적인 움직임을 가지므로 빠른 시간 내에 영상을 처리하여 자기위치를 인식해야 한다. 따라서 이동로봇에 적용 가능한 실용적인 영상왜곡 보정기법을 제안하고 실험을 통하여 성능을 검증한다.
이주상,윤상진,김치균 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.4
Smart phones are currently the most popular electronic devices with high volume production activities driven by high demand and requirements for rapid turnaround time. The changes of displacement were analyzed according to a variable of the gate size and runner system. The radial type and gate with large size were shown that better results in displacement. While the design and production of lenses, the key component of a camera, still need to be improved, the current technology has run into its limit with regard to trends in size and weight reduction. In this study, an injection molding analysis was performed on plastic lenses that are widely employed for smart phone cameras. Specifically, the displacement of lenses at the time of injection molding was studied by varying the gate size and runner system.
李宙相,黃聖淵,曺哉銑 慶熙大學校 1993 論文集 Vol.22 No.-
The capsaicinoids of Korean red peppers were varied with cultivars from 30 mg% to 257mg%, highest in ˝Chungyang˝and medium in ˝Dabock˝ which is most popular to Korean and major capsicinoids were capsaicin and dihydrocapsaicin which are 88.5-94.8% of total capsaicinoids in red peppers. The capsaicinoids of red pepper were distributed 46% in placenta and septum and remainder were in pericarp, seed and stem in the order. The changes in capsaicinoids content of red peppers was not significant during hot-air drying at 65-75℃and sun drying. Fluorescent light was more destructive to capsaicinoids than incandescent light when red pepper powder was exposed to those lights. The larger amount of capsaicinoids was extracted with higher concentration of salt solution, but the water extractability was not affected by pH changes. During storage at 4,25,40℃ for 180 days, capsaicinoids content of red peppers was changed.
이주상,정수연,오승열,장범수,박상현 한국방사선산업학회 2012 방사선산업학회지 Vol.6 No.3
The decomposition of 50 pesticides present in an aqueous solution using γ-irradiationfrom a 60Co gamma-ray source was investigated using laboratory-scale experiment. The rates ofdecomposition were determined using a gas chromatography-electron capture detector (GC-ECD),high-performance liquid chromatography-photo diode array detector (HPLC-PDA), and HPLCfluorescencedetector (FLD). When the initial concentration of pesticides was 10 ppm, and the radiationdose was 2, 5, 10, 20, and 30 kGy, respectively, 14 pesticide samples showed high removalrates (¤50%) at absorbed doses of more than 10 kGy. With the exception of procymidone, theywere all completely removed at a 30 kGy irradiation dose. These results provide fundamental dataon the reactivity between gamma-irradiation and pesticides in an aqueous solution. Further, anevaluation of the toxicity of radiolytic intermediate products is required.