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- 저자 : 이경원(Kyng-won Lee) (검색결과 2 건)
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PE 이중벽관의 맞대기 융착 용접 강도 향상에 관한 연구
안주선,이경원,김재성,이보영,An, Ju-Seon,Lee, Kyng-Won,Kim, Jae-Sung,Lee, Bo-Young 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.1
Waste water is disposed to sewage disposal plant by underground PE double wall pipes. Various processes have been introduced to join PE pipes, but most of these methods have many disadvantages such as costs, lack of reliability and difficulties in joining, etc. Recently butt welding has been paid much attention to joint PE pipes as this process has many advantages such as cost, safety and reliability. In this study, newly developed heat plate, a patent-pending heat plate with a groove, was used to butt-weld PE double wall pipes with different misalignment gaps to simulate real underground conditions, and the butt welding temperature of PE pipe was determined by thermal analysis (Thermal Gravimetric Analysis, Differential Scanning Calorimetry and Dynamic Mechanical Analysis). The resulting joining characteristics of double wall pipes were compared with those from a conventional heat plate, in terms of stiffness, flattening and leakage tests. The results from the stiffness and flattening test showed that there were no big differences between the butt-welded joints made from these two plates. From the leakage test, although PE pipes welded with a conventional heat plate did leak below the required test conditions (10 min. at 0.75kgf/cm2), the pipes welded with a patent-pending grooved heat plate did not show any leakage even at a pressure 1.5 times higher than the required conditions. It was noted that by utilizing a grooved heat plate more complete fusion at the pipe joints could be obtained, which in turn induced a high quality joints.
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B형 간염바이러스 표면항원 검색을 위한 Latex agglutination 법에 대한 고찰
허향숙 ( Hyang Suk Hur ),이경원 ( Kyng Won Lee ),양용석 ( Yong Suk Ryang ),송경순 ( Kyung Soon Song ),이삼열 ( Samuel Y. Lee ) 대한임상검사과학회 1985 대한임상검사과학회지(KJCLS) Vol.17 No.1
The study subjects consisted of positive blood serum samples from 151 patients and negative blood serum samples from 56 patients referred for HBsAg test by ELISA in Yonsei University Yeong Dong Hospital during 5 month period from December, 1984 to April, 1985. HBs Ag was tested by latex agglutination, using the original (LA-A) method and the recently developed, modified (LA-B) method separately as well as RPHA. The results were as follows: 1. Of the 151 HBs Ag positive samples confirmed by ELISA, 140(92.7%) were confirmed positive by RPHA, 134(88.7%) by LA-A and 135(89.4%) by LA-B (P>0.05). 2. Of the 56 HBs Ag negative samples confirmed by ELISA 55(98.2%) were shown negative by RPHA, 53(94.6%) by LA-A and 52(92.9%) by LA-B (P>0.05). 3. Of the 142 moderate to strongly reactive samples (O.D>2.0) confirmed by ELISA, 139(97.9`` %) were confirmed positive by RPHA, 133(93.7%) by LA-B (P>0.05). Of the 9 weakly reactive samples (O.D<2.0) reported by ELISA, 1(1 1. 1%) each was shown positive by RPHA and LA-A and 2(22.2%) by LA-B (P>0.05). 4. Comparison of the original latex agglutination (LA-A) and the modified latex agglutination (LA-B) methods showed their predictability levels were 97.7% by LA-A and 97.1 % by LA-B. There was no significant statistical difference between the LA-A and LA-B methods(P>0.05) and a further advantage of the modified method is its economical use of reagents. On the basis mentioned above, we considered these techniques very useful detection methods because both LA-A and LA-B appear to be equivalent about predictability. Also they can be. applied for mass screening of HBs Ag, and as routine tests for private clinics and emergency testing of HBs Ag in blood banks.
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