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함시영,정동섭,제형곤,주석중,강덕현,김재중,송재관,서준범,임태환,송명근 대한심장학회 2006 Korean Circulation Journal Vol.36 No.2
Background and Objectives:The purpose of this study was to assess the results of a newly developed aortic valverepair technique. Subjects and Methods:Between December 1997 and April 2005, 75 aortic valvuloplasties wereperformed using a new technique that addressed the 3 main components of the aortic root; annulus, sinotubularjunction and leaflet. An internal synthetic strip and ring were implanted along the fibrous annulus to reduce theannulus and sinotubular junction, and additional leaflets were implanted for leaflet correction. Based on theprimary pathology, there were 35, 22 and 18 cases of isolated aortic regurgitation, aortic regurgitation due toascending aortic aneurysm and aortic regurgitation due to annuloaortic ectasia, respectively. Results:The averageage of the subjects was 46.4±16 years; there were 51 and 24 males and females, respectively. There was no operativemortality, with a 2-year freedom from reoperation rate of 97%. Follow up echocardiograms showed significantimprovements in the grade of aortic regurgitation, from a preoperative mean of 3.1±1.2 to 1.08±0.7 immediatepostoperatively, to 1.15±0.6 at the final follow up. Conclusion:The results of the current study showed thistechnique to be effective in the treatment of aortic regurgitation of various causes. Although long-term results arepending, it is our contention that this aortic valve repair technique will be a reliable method in the future.(Korean Circulation J 2006;36:140-149) 배경 및 목적:이 연구의 목적은 새로이 개발된 대동맥판 성형술의 결과를 알아보기 위한 것이다.방 법:대동맥 근부의 세가지 중요한 요소인 판막륜, 동관연결부,판막엽의 교정에 중점을 둔 새로운 대동맥판 성형술이 1997년 12월부터 2005년 4월까지 75명의 환자에서 시행되었다.이는 ring과 strip을 이용해 대동맥 판막륜과 동관연결부의직경을 줄이고 주로 판막엽 첨가술을 이용하여 비정상적인 판막엽을 교정하는 술식으로 구성되어 있다. 병리학적 소견에따라 순수 대동맥판 폐쇄부전증 35명, 상행대동맥류에 의한대동맥판 폐쇄부전증 22명, 그리고 대동맥 근부확장증에 의한 대동맥판 폐쇄부전증 18명이 있었다.
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함시영,주석중,송현,이재원,송명근 대한흉부외과학회 2004 Journal of Chest Surgery (J Chest Surg) Vol.37 No.9
Background: Although traumatic thoracic aortic rupture is potentially a fatal condition requiring surgical attention, the presence of concomitant injury involving other parts of the body may greatly increase the risk of cardiopulmonary bypass. We report our experience of treating associated injuries prior to the thoracic aortic rupture in these patients. Material and Method: From 1997 to 2003, the medical records of 24 traumatic aortic rupture patients were retrospectively reviewed and checked for the presence of associated injury, surgical method, postoperative course, and complications. Surgical technique comprised thoracotomy with proximal anastomosis under deep hypothermic circulatory arrest followed by side arm perfusion to reestablish cerebral circulation. CSF drainage was performed to prevent lower extremity paraplegia. Result: Major concomitant injuries (n=83) were noted in all of the reviewed patients. Of these, there were 49 thoracic injuries, 18 musculoskeletal injuries, and 13 abdominal injuries. Operations for associated injuries (n=16) were performed in 12 patients on mean 7.6±12.6 days following the injury. The diagnosis of aortic rupture at the time of injury was detected in only 18 patients. Delayed surgery of the thoracic aorta was performed on average 695±1350 days after injury and there were no deaths or progression of rupture in any of these patients during the observation period There were no operative deaths and no major postoperative complications. Conclusion: Treating concomitant major injuries prior to the aortic injury in traumatic aortic rupture may reduce surgical mortality and morbidity. 배경: 외상성 흉부대동맥 파열은 수술적 치료가 요구되는 치명적 손상이며 이외에 다른 부위에 복합 손상이 동반되면 심폐 바이패스에 의한 위험도를 크게 증가시킬 수 있다. 여기서 저자들은 심한 동반손상을 먼저 치료한 후 대동맥수술을 하고 그 결과를 관찰하였다. 대상 및 방법: 1997년부터 2003년까지 외상성 흉부 대동맥질환으로 수술을 받은 24명의 환자를 대상으로 의무기록을 후향적으로 검토하여, 동반손상 여부, 수술방법, 수술 후 경과, 합병증 등을 분석하고 국내외 문헌들과 비교하였다. 수술은 초저온 심정지법하에서 심폐 바이패스를 이용한 개흉술로 하였는데 근위부 연결 후 곁가지를 통해 뇌관류를 시행하였고 요추 카테터를 통한 뇌척수액 배액으로 하반신 마비를 예방하였다. 결과: 대상환자 전원에서 83예의 동반손상이 발생하였는데, 흉부손상이 49예, 근골격계 손상 18예, 복부 손상 13예였고, 수상 후 12명의 환자에서 7.6 12.6일에 16예의 동반손상에 대한 수술이 행해졌다. 수상 당시 18예에서만 대동맥 손상이 진단되었다. 중환자실에서 혈압을 약물투여로 조절하면서 안정시키고 수상 후 695 1350일에 지연수술을 시행하였는데, 관찰기간 중 사망이나 대동맥 파열의 진행은 없었다. 수술 사망은 없었으며, 술 후 큰 합병증은 없었다 결론: 외상성 흉부대동맥 파열에 있어서 다른 부위 손상이 동반되면 심한 동반손상을 먼저 치료한 후 수술하는 것이 수술 사망률이나 이병률 면에서 좋은 결과를 가져온다.
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Optimizing SnO<sub>2</sub> for Perovskite solar cells Employing the OMO transparent electrode
윤주석,최우진,박종혁,함동석 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
OMO (Oxide/Metal(Ag)/Oxide) layers are good candidates for transparent electrode of flexible solar cells due to low sheet resistance, high transmittance and flexibility. However, when an OMO applies to as a transparent electrode of the perovskite solar cell (PSC), the silver in the OMO can react with the iodine ions which diffused in the perovskite active layer. As a result, Ag is converted to AgI compound with low conductivity, resulting reduces efficiency of PSC. Here, to solve this problem, amine-based blocking material were introduced into the SnO<sub>2</sub> electron transport layer to prevent contact between iodine and silver. In XRD analysis, AgI peak indicates that metal was transformed to insulator and makes increasing sheet resistance. In our study, because with amine-based film wasn't observed any AgI peak, it makes the using amine-based material assist to operate OMO electrode as perovskite solar cells. As a result, flexible PSCs with up to 11% PCE were fabricated using OMO electrodes.
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OLED 조명용 용액 공정이 가능한 황색 호스트 재료의 연구
신철민,남현국,함주석,김종호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We developed highly efficient solution processable Yellow HOST materials (HY-31, HY-32, HY-34 and HY-35) for OLED Lighting. For developed yellow hosts, we characterized physical properties of HOMO, LUMO, energy gap, m.p., and Tg, respectively. The device performances of the organic light-emitting diodes(OLEDs) with yellow host materials as a yellow host layer were investigated.
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