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한영민,고영성,양수석,이대성,Han, Yeoung-Min,Ko, Young-Sung,Yang, Soo-Seok,Lee, Dae-Sung 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.8
In this paper, the test results of the combustion for 2 IAFR lean fuel models are described. The need for the low emission combustor has been issued from the concern on the increase of green house and the destruction of ozone layer. To evaluate the flow and combustion performance of newly designed 21AFR lean modules, the hydraulic tests in stereolithographic airflows models, the low pressure combustion tests in three injectors model for weak extinction and ignition and the high pressure combustion tests in single sector for NOx, SAE and efficiency are performed. The low pressure tests reveal that the governing parameters in weak extinction and ignition at atmospheric condition are prefilmer length, swirl flow rotation direction, secondary swirl angle and flow split. As a result of combustion test at high pressure, the efficiency and smoke level are satisfied with performance targets, but EINOx of 17.8 is higher than target value of 13.1 The high pressure tests show that the main parameters influenced on NOx are primary swirl angle, swirl flow rotation direction, heatshield exit angle and liner mixing hole location.
한영민,김승한,서성현,이광진,김종규,Han, Yeoung-Min,Kim, Seung-Han,Seo, Seong-Hyeon,Lee, Kwang-Jin,Kim, Jong-Gyu 한국항공우주연구원 2005 항공우주기술 Vol.4 No.2
본 논문에서는 와류형 및 충돌형 분사기를 가진 액체로켓엔진용 축소형 연소기의 기본 설계 및 상세설계에 대해 기술하였다. 와류분사기는 내부에 액체산소 외부에 케로신을 공급하여 노즐 내부 또는 외부에서 혼합하는 구조를 가지고 있다. 축소형 연소기는 분사기 헤드, 삭마 냉각방식의 내열재 연소실 그리고 물냉각 노즐로 구성되어 있다. 분사기 헤드는 18개의 주 분사기, 하나의 중앙 분사기, 연료 메니폴드, 산화제 매니폴드 그리고 추진제 분배기 등으로 구성되어 있다. The procedure of conceptual and detailed design of sub-scale combustor using bipropellant swirl or impinging injector with external or internal mixing for a liquid rocket engine are described in this paper. The sub-scale combustor uses liquid oxygen(LOx) and kerosene as propellants and has a injector head, an ablative material combustor wall and a water cooled nozzle. The injector head has LOx manifold, fuel manifold, fire face plate, one center swirl or impinging injector and 18 main swirl or impinging injectors.
추출된 이종 크롬 친화성 세포의 이식에 의한 마우스에서의 통증 완화 효과
한영민,이종필,황형식,송준호,박상구,박석주,진재광,최은경,김용선,안명수,Han, Young-Min,Lee, Jong-Phil,Hwang, Hyung-Sik,Song, Joon-Ho,Park, Sang-Koo,Park, Suk-Ju,Jin, Jae-Kwang,Choi, Eun-Kyoung,Kim, Yong-Sun,Ahn, Myung-Soo 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.4
Objective : Adrenal medullary chromaffin cells are known to release analgesic substances such as opioides and catecholamines. Transplantation of them is a novel method that challenges current approaches in treating chronic pain. The transplantation of xenogeneic chromaffin cells into the central nervous system(CNS) supply antinociception in animals. In this study, we investigated the analgesic effects of rat adrenal medullary chromaffin cells transplanted into the CNS of the mouse. To study the antinociceptive efficacy of transplanted chromaffin cells, the survival of rat adrenal medullary chromaffin cells transplanted into the CNS of mouse was determined. Methods : The adrenal medullary chromaffin cells isolated from rat were transplanted into the striatum of mouse. These cells were confirmed of the release of Met-enkephalin and Leu-enkephalin by HPLC, and immunoblots for tyrosine hydroxylase(TH). Two weeks after transplantation, we performed immunohistochemistry for TH to determine the survival of implanted cells and assessed pain sensitivity at the same time. Results : The isolated rat adrenal medullary chromaffin cells were positive for anti-TH antibody and released Met-enkephalin and Leu-enkephalin more than rat endothelial cells. Transplanted rat chromaffin cells were stained with anti-TH antibody in striatum of mouse after 2 weeks. Pain sensitivity was reduced on the chromaffin cell-transplanted mouse compared to endothelial cell-transplanted mouse by the hot plate test. Conclusion : These results suggest that the rat chromaffin cells were suitably transplanted into the CNS of mouse. This approach could be used as a therapy for reducing of chronic pain induced by cancer or neuronal injury.
총담관과 T-관 경로에 존재한 이물질의 경피적 올가미 제거: 2예 보고$^1$
한영민,진공용,정수현,김상원,이영환,Han, Yeong-Min,Jin, Gong-Yong,Jeong, Su-Hyeon,Kim, Sang-Won,Lee, Yeong-Hwan 대한영상의학회 2002 대한영상의학회지 Vol.47 No.2
총담관 또는 T-관 경로에 이물질이 있는 경우는 드무나 최근에 담도계의 내시경적 시술 및 경피적 담도 내시경 시술의 발달로 이물질의 빈도가 점점 증가되는 추세이다. 이에 저자들은 내시경적으로 플라스틱 스텐트를 삽입 후 스텐트의 기능부전으로 내시경하에 제거를 시도하였으나 실패한 1예와 경피적 담도 내시경으로 담도내의 결석을 제거하는 시술 도중 안내철사의 플라스틱 유도 물질이 T-관내에 삽입된 후 제거되지 못한 1예를 경피적 올가미 제거법을 이용하여 성공적으로 치료하였기에 이를 보고하는 바이다. Although the presence of foreign bodies in the common bile duct and T-tube tract is uncommon, it is because of recent developments in endoscopic biliary intervention and percutaneous choledochoscopic procedures that they are found with increasing frequency in the biliary tree. We report two cases in which foreign bodies in the biliary tree were successfully removed using the percutaneous gooseneck snare technique. In one patient a plastic biliary stent was malfunctioning and could not be removed under endoscopic guidance, while in the other, a plastic guidewire had been inserted into the T-tube tract during percutaneous choledochoscopy for the treatment of a common bile duct stone
한영민,안명수,Han, Young-Min,Ahn, Myung-Soo The Korean Neurosurgical Society 2001 Journal of Korean neurosurgical society Vol.30 No.6
척추 경막상 지방종증은 과도하게 비대되고 증가된 경막상 지방조직이 신경조직을 압박하여 신경학적 증상을 유발하는 비교적 드문 질환이며, 주로 장기간 투여한 스테로이드와 관련되어 보고되었다. 특발성 척추 경막상 지방종증은 이러한 스테로이드 사용과 상관없이 발생하는 질환으로, 주로 비만 환자에서 발생하는 매우 드문 질환이다. 저자들은 스테로이드 사용과 관련없이 발생한 척추 경막상 지방종증 환자 2례를 치험하여 문헌 고찰과 함께 보고하는 바이다. Spinal epidural lipomatosis, which causes symptomatic compression of neural elements, is a relatively uncommon disease. Although it has been reported frequently in association with the administration of exogenous steroids, a few cases of epidural lipomatosis with no association to exogenous steroids, have been reported. Idiopathic spinal epidural lipomatosis may be a separate disease from that induced by steroid. Here, the authors present two cases of symptomatic epidural lipomatosis with no history of steroid-dependent diseases and review the relevant literature.
한영민,이종필,황형식,임대철,송준호,안명수,Han, Young-Min,Lee, Jong-Phil,Hwang, Hyung-Sik,Lim, Dae-Chul,Song, Joon-Ho,Ahn, Myung-Su The Korean Neurosurgical Society 2001 Journal of Korean neurosurgical society Vol.30 No.3
경막정맥동 혈전증은 다양한 원인을 가진 비교적 드문 질환으로 알려져왔으며 임상양상 및 발현형태가 매우 다양하여 임상적 진단이 쉽지 않았다. 그러나 최근에는 여러 영상진단 방법, 특히 자기공명영상 혈관 촬영등을 통해 조기 진단이 가능하게되었다. 치료 방법을 결정할 때, 환자의 임상증상과 정맥순환계의 개인간 차이가 매우 중요한 인자중 하나이다. 저자들은 보존적 치료로 좋은 결과를 얻은 2례의 경막정맥동 환자의 특성을 문헌고찰과 함께 보고하는 바이다. Cerebral dural sinus thrombosis(CDST) has been described as a rare disease with a variety of patho-etiological factors. The diagnosis of CDST is difficult due to various symptoms and signs, none of which is specific to CDST. But timely diagosis is critical for effective management. The introduction and widespread use of computed tomography(CT), magnetic resonance imaging(MRI) and cerebral angiography made early diagnosis of CDST possible. In particular, MR venography is the most useful tool for establishing a correct diagnosis quickly. In early literature, mortality ranked between 30% and 50% but in more recent series it is between 5.5% and 30%. With the advent of diagnostic and therapeutic tools, early diagnosis and proper management has made the prognosis better. The appropriate therapy for CDST, however, has been the subject of much cortroversy. Individual variations of the venous system and collateral vessels are key factors to decide the proper treatment. In this report, we present two cases with symptomatic CDST treated without open surgical or direct endovascular interventions with good outcome.
Aneurysm Formation of Cervical Aortic Arch Combined with Subaortic Left Innominate Vein: Case Report
한영민,구자홍,진공용,곽효성,정경호,Han, Yeong-Min,Gu, Ja-Hong,Jin, Gong-Yong,Gwak, Hyo-Seong,Jeong, Gyeong-Ho The Korean Radiological Society 2004 대한영상의학회지 Vol.50 No.1
26세 남자가 종격동 종괴를 주소로 내원하였다. 조영 증강 전산화 단층 촬영상 왼쪽 경 동맥궁 동맥류와 합병된 대동맥 판막하의 왼쪽 무명 정맥으로 진단 하였다. 자기공명영상 및 계수적 감산 혈관 촬영상 경 동맥궁 동맥류로 확진되었다. 동맥류는 수술로 제거하였다.저자들은 경 동맥궁 동맥류에 합병된 대동맥 판막하의 왼쪽 무명 정맥 1예를 문헌 고찰과 함께 보고하고자 한다. An asymptomatic 26-year-old man was initially admitted with a suspicious mediastinal mass. On the basis of the contrast-enhanced chest CT findings, aneurysm formation involving the left cervical aortic arch associated with subaortic left innominate vein was diagnosed. The aneurysm was confirmed by MR angiography and DSA. The arch aneurysm was surgically removed. We describe this case, and review the literat
합병증을 동반한 외사성 신주위 혈종의 경피적 도관배액술: 증례 보고$^1$
한영민,진공용,정수현,박종관,Han, Yeong-Min,Jin, Gong-Yong,Jeong, Su-Hyeon,Park, Jong-Gwan 대한영상의학회 2002 대한영상의학회지 Vol.47 No.2
외상성 신주위 혈종은 매우 흔한 질환이다. 신주위 혈종의 정도에 따라 치료 방침이 다르지만 대부분 보존적인 요법으로 치료가 된다. 신주위 혈종으로 인한 합병증은 드믈며, 특히 이로인해 장폐쇄를 일으켰다고 보고한 논문은 거의 없다. 저자들은 신주위 혈종이 있은 후 동반된 합병증으로 장폐쇄가 발생한 환자와 신주위 농양이 발생한 환자에서 경피적 배액술을 실시하여 성공적으로 치료한 2예를 보고하는 바이다. A perirenal hematoma very commonly occurs after trauma. Treatment differs according to the degree of renal injury, though many cases are managed conservatively and complications are rare. We report two cases in which successful treatment of a perirenal hematoma involved percutaneous catheter drainage; in one there was bowel obstruction, and in the other the hematoma was infected.