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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.
문맥과 의미 정보를 사용한 뉴로 심볼릭 앙상블 언어 표현
이주상,옥철영 한국정보과학회 2022 정보과학회논문지 Vol.49 No.12
With the advent of the giant language model, natural language processing has presented an opportunity to break through the wall. However, since super-large language models only use information extracted from the context, they chose to simply increase the size of the model or the amount of data to improve performance. This approach increases the resources consumed by the language model. In this paper, we propose a Neuro Symbolic Ensemble Language Representation (NSELR) that learns the semantic information of vocabulary together with a language model that uses only contextual information. This model uses the semantic constraint information of hypernym and verb-noun relation in the Korean WordNet (UWordNet) and additionally uses the semantic vectors of words. The NSELR was tested in four domains, and it showed better performance than the existing model in the machine reading comprehension. In addition, the speed of learning convergence was faster than that of the existing model, and when there was insufficient data in the application area, it showed better performance than the existing model. 초거대 언어 모델의 등장으로 자연어 처리는 한 단계의 벽을 뛰어 넘는 계기가 되었다. 하지만, 초거대 언어 모델은 문맥에서 추출한 정보만을 사용하기 때문에 성능 향상을 위해 단순히 모델의 크기 또는 데이터의 양을 늘리는 방법을 선택했다. 이러한 방법은 언어 모델이 소비하는 자원의 양을 증가시켜왔다. 본 논문에서는 문맥적인 정보만을 사용하는 언어 모델에 어휘의 의미 정보를 함께 학습하는 뉴로 심볼릭 앙상블 언어 표현 방법을 제안한다. 한국어 어휘망(UWordMap)에서 상위어, 용언의 의미제약 정보 추출했으며, 단어의 의미 벡터를 추가로 사용했다. 4가지 영역에 대해서 뉴로 심볼릭 앙상블 언어 표현 모델을 테스트 했으며, 기계 독해 영역에서 기존 모델보다 좋은 성능을 보였다. 또한 기존의 모델보다 학습이 수렴하는 속도가 빠르며, 응용 영역의 데이터가 부족한 경우 기존 모델보다 좋은 성능을 보였다.
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.
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.
이도우,신혜수,김윤신,이종락,김신도,김기영,이주상 漢陽大學校 環境 및 産業醫學硏究所 1993 環境과 産業醫學 Vol.3 No.1
An investigation was carried out to obtain the basic information of working environments and health condition of workers in nine leather industries during June-October 1993. The mean concentrations of dust were below the standard in all measured industries, whereas the mean concentrations of toluene, M.E.K., and other volatile organic compounds in several industries exceeded each TLV. more that 50% of workers complained in 'headache' and 'stomachache' which might be related to working condition. In geneal, education and regulation policy in leather industries should be mire strictly controlled since working environment seemed not to be good condition.
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.