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접히는 날개 사용을 통한 비행시간 확보와 라디오 송신 가능한 캔위성의 구현
서정기,이유영,윤용현,박민준 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
2015년 캔위성 경연대회가 미래창조과학부와 KAIST인공위성 연구센터 주최 하에 성공적으로 개최되었다. 본 논문은 슬기부 우수상 수상팀인 YYCS팀의 연구 내용을 확장임무를 중심적으로 서술하였다. YYCS 팀의 캔위성은 IMU 자세정보, 지상 이미지 정보, GPS 위치 정보를 송신하는 기본임무를 수행하였으며 ‘재난상황시 사용가능한 캔위성의 제작’을 확장임무로 선정하여 연구를 진행하였다. 재해 발생 시 전기의 불안정한 공급에 의한 통신 두절 문제를 해결하기 위하여 MP3에 녹음된 음성을 FM라디오로 송신가능한 캔위성을 구현하였다. 재난 방송 시간을 확보하기 위하여 접을 수 있는 날개구조를 제작하였으며 낙하산과 함께 사용하여 비행시간을 크게 확보하였다. 2015 Cansat Competition was held successfully under the joint auspice of Ministry of Science, ICT and Future Planning and KAIST. This study is focus on extended mission of Team YYCS who won the second prize in high school youth group. The cansat of team YYCS performed basic mission such as sending IMU attitude information, earth image information and GPS position information. YYCS team selected ‘Making usable Cansat in disaster’ for extended mission of the team and researched about it. We realize cansat which can send MP3 sound with FM radio to solve the communications interruption problem for unstable sending electricity. With the foldable propellers and parachute, our cansat could extend the broadcasting time.
소아 장림프관확장증의 진단에서 내시경적 소장생검의 의의
서정기,고재성 대한소화기내시경학회 1997 Clinical Endoscopy Vol.17 No.6
Background/Aims: Intestinal lymphangiectasia is a disease characterized by dilated lymphatics of the intestinal mucosa and excessive enteric loss of plasma proteins. Instead of multiple blind peroral jejunal biopsy, duodenal endoscopy and endoscopic small bowel biopsy were performed. We evaluated the significance of endoscopic small bowel biopsy and the usefulness of the other diagnostic methods in the diagnosis of intestinal lym- phangiectasia in children. Methods: Fourteen children seen between August 1989 and August 1997 with clinically suggestive intestinal lymphangiectasia were analysed. The median age at onset of symptoms was 4 years. Primary intestinal lymphangiectasia occurred in 10 children and secondary intestinal lymphangiectasia occurred in 4 children, of whom two had Fontan operation, one had constrictive pericarditis, and one had Crohn's disease. Low fat, high protein diet with medium chain triglycerides was the mainstay of treatment. Results: 1) Diarrhea was present in l4 patients, and edema in 11 patients. Hypocalcernic tetany occurred in 6 children and vomiting in 5 children. Eight children had ascites and three of these had chylous ascites. Growth retardation was present in four patients, chylothorax in one, and lymphedema in one. The initial serum albumin concentration was 1.8 g/dl, the serum calcium level 6.7 mg/dl, and the total lymphocyte count 623 /㎣. 2) Dilated lymphatics in the small bowel mucosa was confirmed by endoscopic biopsy in 14 children(100%). The sensitivity of α₁-antitrypsin clearance was 100%. Duodenal endoscopy showed scattered white spots covering mucosa in 11 children(79%). Small bowel series revealed thickened mucosal folds in 10 children(77%). Four(31%) had positive finding of ^(99m)Tc-antimony lymphoscintigraphy. 3) Responses to treatment in children with primary intestinal lympllangiectasia were graded as good if the symptoms resolved, and poor if there was no lasting resolution of symptoms and repeated albumin administrations. Response to therapy was food in four and poor in six patients. Tlie mean age at onset of symptotas was 8 years in good resonse group, and 2 years in poor response group(p $lt; 0.05). Conclusion: Tie diaginosis of intestinal lymphangiectasa is confirmed by duadenoscopy and endoscopic small bowel biopsy in a child with diatrltea, edema, hypoalburninemia, and lymphocytopenia. As compared with other diagnostic methods such as small bowel series and lymphoscintigraphy, duodenoscopy and endoscopc small bowel biopsy are very sensitive and should be performed early.