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UAV을 위한 집중 유지 지원 프레임워크의 효과 검증 연구
윤주식,권남연,최예림,박종헌,신동민 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
무인항공기(Unmanned Aerial Vehicle)는 조종사가 실제 비행 환경에서 물리적으로 떨어져있다는 점 때문에 유인항공기에 비해 집중을 유지하는 데 어려움이 있으며 이는 높은 사고율로 이어진다. 이러한 문제를 해결하기 위하여 무인항공기를 운용하는 조종사의 집중도 유지를 보조해 줄 시스템이 필요하다. 본 연구는 조종사의 EEG 신호를 기반으로 집중 여부를 판별하는 지지기반벡터 모델을 학습하여 비집중 상태를 실시간으로 파악하고 경고를 통해 이를 해소하는 집중 유지 지원 프레임워크를 제안하였다. 해당 프레임워크의 효과를 검증하기 위한 대조 실험 결과, 프레임워크로 집중 상태 유지를 도왔을 때의 비행이 그렇지 않을 때에 비해 통계적으로 더 안정적인 것으로 나타났다. 차후 집중도 판별 모델과 프레임워크의 개선 등을 통해 프레임워크를 더 좋은 성능으로 발전시킬 수 있을 것으로 예상된다. Due to the physical separation between cockpit and vehicle, UAV(Unmanned Aerial Vehicle) pilots have difficulty in maintaining attention state during maneuvering, which lead to high accident rate of UAVs. To handle this problem, system to assist UAV pilot to retain attention state is required. This research present framework that detect pilot"s inattention state using EEG signal based on Support Vector Machine(SVM) model and restore to attention state using alert system. In controlled experiment to validate framework"s effectiveness, flights using presented framework to retain attention state were statistically superior to those with no alert framework. By enhancing inattention detect model and framework"s alert system, presented framework can show better performance in the future.
Metastatic Pulmonary Ameloblastoma Misdiagnosed as Primary Squamous Cell Carcinoma Preoperatively
윤주식,김도완,김성순,최유덕,송상윤,나국주 대한흉부외과학회 2014 Journal of Chest Surgery (J Chest Surg) Vol.47 No.1
Ameloblastomas are rare odontogenic epithelial tumors that occur mainly in the mandible. Despite their benign histologic appearance, they are locally aggressive with a high recurrence rate. However, a metastasizing ameloblastoma has been rarely reported. According to the current World Health Organization classification system, the definitive diagnosis of metastasizing ameloblastoma can only be carried out in retrospect, after the event of metastasis. This case report describes a patient with metastatic pulmonary ameloblastoma, 17 years after the surgical excision of an odontogenic tumor, preoperatively misdiagnosed as primary squamous cell carcinoma.
Diffuse Large B-cell Lymphoma Arising from Chronic Tuberculous Empyema
윤주식,송상윤,강승구,김조헌,정요천,최유덕,나국주 대한흉부외과학회 2015 Journal of Chest Surgery (J Chest Surg) Vol.48 No.1
Pyothorax-associated lymphoma is a relatively rare type of lymphoma that occurs in patients who have long historiesof tuberculous pleuritis or induced pneumothorax. It is a type of non-Hodgkin’s lymphoma of mainly the B-cellphenotype and is strongly associated with Epstein−Barr virus infection. A majority of these cases have been reportedin Japan, although some cases have occurred in Western countries. Here, we describe a case of pyothorax-associated lymphoma in a patient with a 30-year history of chronic tuberculous empyema. The patient underwentdecortication under the impression of chronic empyema with fistula. The histopathologic diagnosis was a diffuselarge B-cell lymphoma associated chronic inflammation.
Mixed Squamous Cell and Glandular Papilloma of the Lung in a 64-Year-Old Woman
윤주식,김도완,최유덕,나국주,송상윤 대한흉부외과학회 2014 Journal of Chest Surgery (J Chest Surg) Vol.47 No.1
Mixed squamous cell and glandular papilloma of the lung is an extremely rare benign epithelial tumor showing a mixture of squamous and glandular epithelium. Here, we report a case of mixed squamous cell and glandular papilloma that presented as a solitary nodule in the left lower lobe of a 64-year-old woman. Chest computed tomography demonstrated a lobulated mass in the basal segment of the left lower lobe. The patient underwent a lobectomy under the suspicion of lung malignancy. The histopathological diagnosis was mixed squamous cell and glandular papilloma.
윤주식,송상윤,강승구,김상형,나국주 대한흉부외과학회 2015 Journal of Chest Surgery (J Chest Surg) Vol.48 No.4
Epithelioid hemangioendothelioma (EHE) is a relatively rare and moderately aggressive type of vascular tumor. We describe a case of EHE that presented in a 24-year-old woman as a palpable nodule in the left cervical area. Radiological examinations and fine-needle aspiration cytology led to a preliminary diagnosis of metastatic lymphadenopathy with an unknown primary site. However, during surgery, we determined that the nodule was an intravascular tumor arising from the left internal jugular vein. The histopathological examination revealed cords of epithelioid endothelial cells distributed in a hyaline stroma, compatible with a diagnosis of EHE.
윤주식,나국주,송상윤,최용선,김상형,오상기 대한흉부외과학회 2009 Journal of Chest Surgery (J Chest Surg) Vol.42 No.3
Adenoid cystic carcinoma (ACC) commonly originates in the major salivary glands and respiratory tract, but it is extremely rare to find ACC in the esophagus. ACC of the esophagus is clinopathologically different from the salivary gland variant. It shows more aggressive malignant behavior and a very poor prognosis. We report here on the surgical and clinopathologic findings of an ACC of the esophagus in a 65-year-old man, and we also include a review of the relevant medical literature. 선양 낭포성 암종은 주로 주타액선, 호흡기 등에 잘 발생하는 종양으로 식도에서는 매우 드물게 발생한다. 식도의 선양 낭포성 암종은 타액선에 발생하는 것과는 임상병리학적으로 차이가 있으며, 악성도가 높고 예후가 불량하다. 저자들은 65세 남자 환자에서 발생한 식도의 선양 낭포성 암종을 치험하였기에 이에 대한 수술 및 임상병리적 소견을 문헌 고찰과 함께 보고하고자 한다.