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프리스트레스트 콘크리트 침목의 재활용 기술에 대한 고찰과 기초 실험
이재영,이의준,이재원,양선모,권성우 한국건설순환자원학회 2023 한국건설순환자원학회 논문집 Vol.11 No.4
지속가능한 폐기물 관리의 필요성으로 인해 철도에 사용되는 프리스트레스트 콘크리트 침목의 재활용에 관한 관심이 높아졌다. 이에 따라, 사용 수명이 다한 폐콘크리트 침목의 양이 증가한다는 점과 이것이 환경에 미치는 영향을 고려할 때, 폐콘크리트침목의 효율적인 재활용 방법을 찾는 것은 매우 중요하다. 이 연구는 현재의 재활용 방법, 특히 기계적 처리 방법을 조사하고, 이들의 이점, 한계, 그리고 경제적 실현 가능성에 대해 파악하였다. 이를 참고하여 본 연구는 기계적 재활용 처리 방법의한 예시를 수행하여 회수된 순환 골재의 특성과 이를 포함하여 제조한 알칼리 활성화 플라이애시 콘크리트의 특성을 분석하였다. 향후 본 연구 결과물을 콘크리트 침목으로 다시 적용할 목적으로 기초적으로 연구하였다. The need for sustainable waste management has intensified the focus on recycling prestressed concrete sleepers used in railways. Given their high volume and environmental impact at the end of their service life, finding efficient recycling methods is crucial. This study explores current recycling approaches, particularly mechanical techniques, evaluating their advantages, limitations, and economic feasibility. Finally, an example of mechanical recycling was performed. The analysis results of the resulting recycled aggregates are suggested. Then, the non-cement concrete mixtures with recycled aggregates were designed, and their strength development was analyzed.
맥락총 비대에 의한 수두증을 동반한 9p Tetrasomy 1례
김철홍(Chul Hong Kim),양의준(Eui Jun Yang),남상욱(Sang Ook Nam),김수영(Su Yung Kim) 대한소아신경학회 1999 대한소아신경학회지 Vol.7 No.1
저자들은 안면 이형성증을 주소로 내원한 환아에서 실시한 염색체 검사상 9p tetrasomy로 지단 받은 후 두위가 체중 및 신장에 비해 상대적으로 증가되어 있어 실시한 뇌 자기공명영상에서 맥락총의 비대가 수두증이 보였던 경우를 경험하였다. 9p Tetrasomy is rare chromosomal aberration that was described in approximately 30 previous patients in the world and this is the first described in Korea, Here we report a 3 month-old boy who was referred for genetic evaluation because of facial dysmorphism, such as wide fontanells, hypertelorism, bulbous nose, low set eaes, cleft lip and palate. He had also psychomotor retardation and hypotonia. He was diagnosed as tetrasomy 9p syndrome by clinical feature and chromosomal study. Thereafter, increased growing of head size compared with body weight and height was observed and brain MRI shows hydrocephaly associated with remarkable hypertrophy of choroid plexus and mild Dandy Walker syndrome.
박재홍,이주석,송익진,양의준,남상욱 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.3
Behcet's disease consists of a triad of relapsing inflammatory disease of the eye (iridocyclitis) with painful and recurrent oral and genital ulcerations. Arthritis, thrombophlebitis, neurologic abnormalities, fever, and colitis are associated clinical manifestations. The disease affects predominantly young adults and is very rare in children, especially those under 10 years of age. The proportion of Behcet's colitis in Behcet's disease is about 12%. Ulcerations are localized or diffuse, with the majority occuring in the ileocecal region. Extension to the serosal surface may result in perforation. The frequent complaints are abdominal pain, nausea, vomiting, diarrhea, hematochezia, loss of appetite, loss of weight gain, distention and palpable abdominal mass. The disease is complicated by intestinal obstruction, perforation, fistula formation, abscess formation and hemorrhage. We experienced a case of Behcet's colitis in a 9-year-old boy showing symptoms of abdominal pain, tenderness, and diarrhea. Thus, we report a case of Behcet's colitis with brief review of related literatures.
Acute Motor Axonal Neuropathy 1례
김선영(Sun Young Kim),이주은(Ju En Lee),양의준(Eu Jun Yang),남상욱(Sang Ok Nam) 대한소아신경학회 1999 대한소아신경학회지 Vol.7 No.2
저자들은 임상적으로나 뇌척수액 검사 소견상 Guillain-Barré 증후군과 유사하나 전기 생리학적 검사로 축삭 병변 소견을 보여 acute motor axonal neuropahty로 진단된 1례를 문헌고찰과 함께 보고하는 바이다. In northern China, annual epidemics of acute-onset flaccid paralysis diagnosed clinically Guillain-Barre syndrome have been observed for at least 20 years. These patients had a distinctive pattern that shares clinical and cerebrospinal fluid findings with demyelinating Guillain-Barré syndrome. But it was different from Guillain-Barré syndrome physiologically and pathologically. Electrodiagnostic studies showed normal motor distal latencies and limb conduction velocity, but reduced compound muscle action potential amplitude. When sensory nerve action potentials are elicitable, F waves are within the range of normal. This disorder was named acute motor axonal neuropathy characterized pathologically by motor nerve fiber degeneration of variable severity and by sparing of sensory fibers. Recovery is usually complete. We experienced a case of acute axonal motor neuropathy, and reported the case with a review of literature.