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- 저자 : 안주선 ( Ju Seon An ) (검색결과 4 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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방성혁,김중강,안주선 啓明大學校 醫科大學 1992 계명의대학술지 Vol.11 No.4
Sphenoid mucocele is vary rate. In 1872, Rouge Identified a sphenoid mucocele first, and then only about 130 cases have been reported in the literatures since sphenoid mucocele was first described by Berg in 1889. In Korea, sphenoid mucoceles have been reported in the literatures only about 10 cases since it was first described by Yoon et at, in 1988. Paranasal sinus mucoceles are usually found in the frontal sinus and ethmoid sinus, but the sphenoid and maxillary sinus mucoceles are rare. We experienced a case of sphenoid pyocele which caused blindness and was satisfactorily treated by endoscopic surgery. So, we report our endoscopic surgical experience with review of literatures.
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김중강,김종훈,안주선,방성혁,김덕준 啓明大學校 醫科大學 1992 계명의대학술지 Vol.11 No.2
Authors had clinical analysis on 100 patients (101 ears) of traumatic tympanic membrane perforation who were treated between January, 1986 to December, 1986. We analized them by age, sex, cause, symptom, location, size, and shape of the traumatic tympanic membrane perforation. The majority of patients (62%) visited to our department within 5 days after trauma. The results were as follows: Young age groups(20's, 30's, 10's in the declining order) and female were involved more frequently. Left side was more frequently involved(73%). The most common cause is hand slap, especially in the young age group. The main subjective symptoms were hard of hearing(35%), tinnitus(28%), earfullness(21%), otalgia(10%) in the declining order. The most common location of the tympanic membrane perforation was anteroinferior quadrant(32.7%), and posteroinferior quadrant occupies the next order. The size of the tympanic membrane perforation showed 82 cases(gradeⅠ), 13 cases(grade Ⅱ), 3 cases(grade Ⅲ), 3 cases(grade IIII) in the declining order. The most common shape of the tympanic membrane perforation was round to oval(73 cases), and triangular to slit(20 cases), rectangular or irregular(8 cases) in the declining order.
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