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[디젤엔진부문] 대형디젤기관에서 EGR 장착에 의한 성능 및 배출가스의 특성에 관한 연구(2)
한영출(Young-chool Han),엄명도(Myoung-do Eom),류정호(Jung-ho Ryu),오용석(Yong-suk Oh),양규창(Gyu-chang Yang) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effects of EGR on performance and emissions were investigated in this study. The engine used for the tests was a six-cylinder 8 litre turbo-charged heavy-duty diesel engine with a low pressure route EGR system. The quantity of recirculated gas was controlled by a manually operated valve which is installed between the turbin outlet and compressor inlet. The experiments were performed at various engine speeds and loads while the EGR rates were varied. Exhaust emissions with the EGR system were compared to the baseline emissions. To evaluate the availability of EGR technology, further testing was performed using 0-13 mode steady-state test procedure.<br/> It was found that the exhaust emissions with the EGR system resulted in a very large reduction in NOx at the expense of higher smoke and PM emissions, especially at high loads. Also, the power and fuel economy deteriorated substantially. Results of the 0-13 test indicated that the proposed 200012002 NOx standards were met.<br/>
조승호(Seung Ho Cho),김민식(Min Sik Kim),김동집,이경식(Kyung Sik Lee),김훈교(Hoon Kyo Kim),홍영선(Young Sun Hong),한지연(Ji Youn Han),서병도(Byung Do Suh),윤세철(Sei Chul Yoon),강진형(Jin Hyoung Kang),오용석(Yong Suk Oh) 대한두경부종양학회 1994 대한두경부 종양학회지 Vol.10 No.2
Soft tissue sarcoma of the head and neck is not frequent neoplasm, accounting for less than 1% of all malignant neoplasm in the region. The histological varieties include osteogenic sarcoma, malignant fibrous histiocytoma, rhabdomyosarcoma, fibrosarcoma, tenosynovial sarcoma, angiosarcoma and chondrosarcoma. Rhabdomyosarcomas of the head and neck usually occur in children under the age of 10 years (over 70%) and rarely develop in adults over the age of 20 years. The prevalent sites of involvement include the orbit, nasal cavity, external ear, paranasal sinus and soft tissue of mouth and the primary location of tumor is considered to be one of the important prognostic factors. Before the 1960s, when surgical resection was the only method of treatment, the 5-year survival rate was less than 20%, but recently it has been greatly improved by the multimodality treatment, combining surgery with chemotherapy and radiation therapy. Here we treated a rhabdomyosarcoma woman with three cycles of high dose chemotherapy followed by radiation therapy. After the, completion of preoperative treatments, successful result of more than partial response was achieved. Three months later total maxillectomy and radical neck dissection was performed. There was no evidence of tumor infiltration in the resected tumor and regional lymphnodes but metastasized tumor cells in cervical lymphnodes were detected. Tumor cell infiltration was also found on the bone marrow biopsy to evaluate the pancytopenia which occurred during postoperative recovery. Two months later she died of secondary bone marrow failure. We think that this multimodality treatment combining pre-operative chemotherapy, radiotherapy and surgery might play an important role in curative resection and eyeball preservation in patients with rhabdomyosarcoma involving the eyeball.
오용생,이동하,남도원,이전영 한국지능정보시스템학회 2001 지능정보연구 Vol.7 No.1
Sequential discovery from time series data has mainly concerned about events or item sets. Recently, the research has stated to applied to the numerical data. An example is sensor information generated by checking a machine state. The numerical data hardly have the same values while making patterns. So, it is important to extract suitable number of pattern features, which can be transformed to events or item sets and be applied to sequential pattern mining tasks. The popular methods to extract the patterns are sliding window and clustering. The results of these methods are sensitive to window size or clustering parameters; that makes users to apply data mining task repeatedly and to interpret the results. This paper suggests the method to retrieve pattern features making numerical data into vector of an angle and a magnitude. The retrieved pattern features using this method make the result easy to understand and sequential patterns fording fast. We define an inclusion relation among pattern features using angles and magnitudes of vectors. Using this relation, we can find sequential patterns faster than other methods, which use all data by reducing the data size.
주남영,도복태,임원준,석욱,오용창,김명준,우종길,정정명 인제대학교 1998 仁濟醫學 Vol.19 No.1
총수담관 막양구조는 1939년 Carter 등에 의해 처음 보고된 이래 세계적으로는 약40예, 국내는 아직 많이 보고되지 않은 드문 질환이다. 저자들은 열을 동반하지 않고 황달 및 심와부 동통을 주소로 내원한 56세 남자 환자에서 내시경적 역행술로 진단하고 수술로 치료한 총수담관 막양구조 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Common bile duct(CBD) web is a very rare disease. Since its first description in 1939 by Carter, about 40 cases have been reported in the world. This was found in a 56-year-old man who had the epigastralgia and jaundice without fever. He was diagnosed as CBD web by endoscopic retrograde cholangio-pancreatography (ER-CP) and treated with operation. We report this rare case with the review of literature.
개에서 급성 동량성 혈액희석 하에서 Sodium Nitro-prusside 를 이용한 유도저혈압이 심혈관계 및 전신 산소 균형에 미치는 영향
김태형,이상철,이국현,고홍,김용락,오용석,노영진,도상환 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.36 No.5
Background : To decrease homologuous transfusion and bleeding, Acute Normovolemic Hemodilution (ANH) may be combined with induced hypotension. Tissue oxygen balance may be in danger because of decreased tissue perfusion pressure by induced hypotension and reduced arterial oxygen content by ANH. Thus it is necessary to evaluate effects of induced hypotension combined with ANH on hemodynamics and systemic oxygen balance. Methods : In 6 mongrel dogs anesthetized with N2O-O2-enflurane and paralyzed with vecuronium, ANH was performed up to half of initial level of hemoglobin with isovolemic pentastarch infusion, and then mean arterial pressure (MAP) was lowered by 30% of the initial value by intravenous administration of Sodium Nitroprusside (SNP). Various hemodynamic parameters were measured before and after ANH and 15, 30, 45 and 60 minutes after induction of hypotension and 15 minutes after the end of hypotension. Results : Heart rate was not changed significantly throughout the study. Central venous pressure increased significantly after ANH but decreased to the initial value after induced hypotension. Systemic vascular resistance showed significant decrease after ANH, more significant decrease after induced hypotension and slight increase after discontinuation of SNP. Cardiac output increased markedly by ANH and maintained during induced hypotension. Oxygen flux decreased significantly after ANH but slightly increased after induced hypotension. Oxygen consumption and Oxygen extraction ratio were maintained throughout the study. There were no acidemia and hypoxemia throughout the study. Conclusion : The combined use of ANH and induced hypotension with SNP is safe in the aspect of cardiovascular system and systemic oxygen balance. (Korean J Anesthesiol 1999; 36: 869∼875)