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수재해 정보관리 및 서비스를 위한 공간, 비공간 정보 자료 개념 설계
이정주,김동영,정영훈,황의호,채효석,Lee, Jeong-Ju,Kim, Dong-Young,Jung, Young-Hun,Hwang, Eui-Ho,Chae, Hyo-Sok 한국농공학회 2016 한국농공학회논문집 Vol.58 No.2
This study conducted a basic design of system and interface which provide both of spatial and non-spatial data for water hazard information management. This helps to decide directions of the future integrated water hazard information platform and possible technical examinations of the web-based system for the realization of the prototype. For user friendly system, this study did a survey to investigate the data format, service environment, image processing level and visualization type that users prefer. Also, authorization range was set up by type of the user group. In the water hazard information platform, the data and analysis algorithm were classified by the fields. Furthermore, the platform was consisted with six block systems according to the function and the interface and designed to flexibly mount or modify the additional functions. For a basic design of the data exchange method and protocols, a prototype was constructed by using the spatial information web service technology. The portal service system to visualize and provide spatial data was designed by the WMS/WFS type of OGC standard interface and the FTP/HTTP interface type through open source GIS software for server environment.
이정주,김유겸,Lee, Jung-Ju,Kim, You-Kyum 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.2
Selected standard methods for washing machines: agitating type; horizontal drum type. Market detergents: standard powder detergent; powder detergent; liquid detergents. Standard soiled clothes composed of five types, including the various contaminants from the actual life of soiled clothes, respectively. When washing with the standard course for a washing machine and using the standard, recommended amount of detergent product, the detergency for the agitating-type washing machine and standard soiled clothes increased by approximately 25%, on average, compared to the case of -30% use, and increased by 2% compared to the case of +60% use, respectively. When the horizontal drum-type washing machine was used, detergency increased by approximately 28%, on average, compared to -30% use, and increased by 12% compared to +100% case. Accordingly, the detergency when using the standard amount of detergent increased by approximately 27% on average, and increased by approximately 7% compared to the cases of +60%~+100% use. Moreover, the residue of the detergent components was extremely small, but proportional nonetheless to detergent concentration.
자동차 브레이크 마찰재용 비침상형 육티탄산칼륨의 합성 연구
이정주,이나리,피재환,김종영,김정주,Lee, Jung Ju,Lee, Na-Ri,Pee, Jae-Hwan,Kim, Jong-Young,Kim, Jeong-Joo 한국재료학회 2017 한국재료학회지 Vol.27 No.3
We synthesized potassium hexatitanate, ($K_2Ti_6O_{13}$, PT6), with a non-fibrous shape, by acid leaching and subsequent thermal treatment of potassium tetratitanate ($K_2Ti_4O_9$, PT4), with layered crystal structure. By controlling nucleation and growth of PT4 crystals, we obtained splinter-type crystals of PT6 with increased width and reduced thickness. The optimal holding temperature for the layered PT4 was found to be ${\sim}920^{\circ}C$. The length and width of the PT4 crystals were increased when the nucleation and growth time were increased. After a proton exchange reaction using aqueous 0.3 M HCl solution, and subsequent heat treatment at $850^{\circ}C$, the PT4 crystal transformed into splinter-type PT6 crystals. The frictional characteristics of the friction materials show that as the particle size of PT6 increases, the coefficient of friction (COF) and wear amounts of both the friction materials and counter disc increase.
GMT Sheet에서 섬유함유율 및 섬유배향이 인장강도에 미치는 영향
이정주(Jung-Ju Lee),이동기(Dong-Gi Lee),심재기(Jae-Ki Sim),조선형(Seon-Hyung Jo),김진우(Jin-Woo Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
We can say that the increasing range of the value of GMT Sheet's tensile strength in the direction of fiber orientation is getting wider as the tiber content increases. It shows that the value of GMT Sheet's tensile strength in the direction of fiber orientation 90 is similar with the value of pp's intensity when fiber orientation function is J=0.7, regardless of the tiber content. Tensile strength of GMT Sheet is affected by the fiber orientation distribution more than by the fiber content.
이정주 ( Jung Ju Lee ) 대한주산의학회 2009 Perinatology Vol.20 No.1
Low birth weight has been defined by the World Health Organization (WHO) as weight at birth of less than 2,500 g. This practical cut-off for international comparison is based on epidemiological observations that infants weighing less than 2,500 g are approximately 20 times more likely to die than heavier babies. The low birth weight rate is one of the most important indicators that represent the health care situation of a nation. The low birth weight rate for industrialized countries was around 7 percent, and in less developed countries it ranged between 5 and 33 percent, with an average of 17 percent. In Korea, low birth weight rate was presented between 4 and 9.8 percent. but I thought that the true low birth weight rate in Korea was around 5 percent recently.