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최영주(Young-Ju Choi),서용덕(Yong-Deuk Seo),박준(Jun Park),이상국(Sang-Goog Lee) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.3
This paper has proposed a method of developing the reality navigation system that has applied the augmented reality technique to the screen of automobile navigation system. This method complements the differences between real world and map that are held by the existing navigation systems, incorrect screen display of map images, and difficulties in making and managing map images. These are made possible by taking the real images in the driving direction, by using the images in place of an electronic map, and by displaying the movement direction and major building information in real-time on the images. Also by applying the augmented reality technique, driver can recognize the navigation information such as the names and locations of major buildings easily and accurately.
이윤국(Youn-Goog Lee),김난희(Nan-Hee Kim),최영섭(Young-Seop Choi),김선정(Sun-Jung Kim),박주현(Ju-Hyun Park),강유미(Yu-Mi Kang),배석진(Seok-Jin Bae),서계원(Kye-Won Seo),김종민(Jong-Min Kim) 한국환경보건학회 2020 한국환경보건학회지 Vol.46 No.2
Objective: This study is designed to measure the concentration of DBPs (disinfection by-products) in pool water and in air and to estimate the carcinogenic potential through the evaluation of inhalation exposure. Methods: The subjects were six indoor swimming pools with many users in Gwangju. Samples of pool water and indoor air were taken every one month from August 2018 to August 2019 and analyzed for eight swimming pool standards. Three-liter air samples were collected and the VOCs were analyzed using GC/MS directly connected to thermal desorption. Results: pH was 6.8-7.5 and the concentration of free residual chlorine in pool water was 0.40-0.96 ?/ℓ. Physicochemical test items such as KMnO₄ consumption and heavy metal items such as Aluminum met existing pool hygiene standards. No VOC materials were detected except for the DBPs. The concentration of THMs in the pool water was 11.05-41.77 µg/L and the THMs mainly consist of Chloroform (63-97%) and BDCM (3- 31%). The concentration of indoor air THMs is 13.24-32.48 µg/m3 and consists of Chloroform. The results of carcinogenic assessment of chloroform in the indoor swimming pool via inhalation exposure were 2.0 to 6.4 times higher than the ‘acceptable risk level’ suggested by the US EPA. Conclusions: The concentration of THMs in the pool water is 11.05-41.77 µg/L, most of which is chloroform. In addition, the concentration of indoor air THMs is 13.24-32.48 µg/㎥ . The result of carcinogenic assessment of chloroform was 2.0 to 6.4 times higher than the ‘acceptable risk level’ suggested by the US EPA.
Ni 계 초내열합금의 PTA 오버레이 층 특성에 관한 연구
김영식,최영국,이광렬,Kim Young-Sik,Choi Young-Goog,Lee Kwang-Ryeol 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.3
The Plasma Transferred Arc (PTA) overlaying method is lately introduced as one of the most useful surface modification method of the engine component. In this paper, the characteristics of the Co-base and Ni-base super alloy overlay layers by PTA method were investigated through the metallurgical, abrasive and cavitation erosion test. Experimental results showed that the abrasive wear resistance of the Co-base Stellite 6 overlayer was the most superior and followed in order of Nimonic 80A, Inconel 625 and Inconel 718. However, the cavitation erosion characteristic of the Stellite 6 overlayer was the most inferior and it was better in order of Inconel 625, Inconel 718 and Nimonic 80A.