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수증기 메탄 개질 반응을 이용한 수소 생산용 Ni-Cr-Al 다공체 지지 촉매의 제조, 기계적 안정성 및 수소 환원 효율
김규식,강태훈,공만식,박만호,윤중열,안지혜,이기안,Kim, Kyu-Sik,Kang, Tae-Hoon,Kong, Man Sik,Park, Man-Ho,Yun, Jung-Yeul,Ahn, Ji Hye,Lee, Kee-Ahn 한국분말재료학회 (*구 분말야금학회) 2021 한국분말재료학회지 (KPMI) Vol.28 No.3
Ni-Cr-Al metal-foam-supported catalysts for steam methane reforming (SMR) are manufactured by applying a catalytic Ni/Al<sub>2</sub>O<sub>3</sub> sol-gel coating to powder alloyed metallic foam. The structure, microstructure, mechanical stability, and hydrogen yield efficiency of the obtained catalysts are evaluated. The structural and microstructural characteristics show that the catalyst is well coated on the open-pore Ni-Cr-Al foam without cracks or spallation. The measured compressive yield strengths are 2-3 MPa at room temperature and 1.5-2.2 MPa at 750℃ regardless of sample size. The specimens exhibit a weight loss of up to 9-10% at elevated temperature owing to the spallation of the Ni/Al<sub>2</sub>O<sub>3</sub> catalyst. However, the metal-foam-supported catalyst appears to have higher mechanical stability than ceramic pellet catalysts. In SMR simulations tests, a methane conversion ratio of up to 96% is obtained with a high hydrogen yield efficiency of 82%.
이하선 부위에 발생한 Angiolymphoid Hyperplasia with Eosinophilia
김규식,노혜일,오현진,천병준,조정해,강석진,Kim, Que-Chic,Noh, He-Il,Auo, Hyeon-Jin,Chun, Byung-Joon,Cho, Jung-Hae,Kang, Seok-Jin 대한기관식도과학회 2002 大韓氣管食道科學會誌 Vol.8 No.2
Angiolymphoid hyperplasia with eosinophilia(ALHE) is an uncommon idiopathic condition that presents with isolatedor grouped cutaneous plaques or nodules of the head and neck. Extracutaneous involvement is rare. ALHE is a distinct pathologic entity marked by a proliferation of blood vessels with distinctive large endothelial cells accompanied by a characteristic inflammatory infiltrate that includes eosinophils. The lesion is benign but may be persistent and difficult to eradicate. The authors have recently experiecned a case of angiolymphoid hyperplasia with eosinophilia in a 52-year-old male who had a painless enlarging mass in his right preauricular area and external ear canal for several years. We present this case with the review of literatures.
분말 합금법으로 제조된 Fe-Cr-Al 금속 다공체의 구조, 미세조직 및 기계적 특성
김규식,강병훈,박만호,윤중열,이기안,Kim, Kyu-Sik,Kang, Byeong-Hoon,Park, Man-Ho,Yun, Jung-Yeul,Lee, Kee-Ahn 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.1
The Fe-22wt.%Cr-6wt.%Al foams were fabricated via the powder alloying process in this study. The structural characteristics, microstructure, and mechanical properties of Fe-Cr-Al foams with different average pore sizes were investigated. Result of the structural analysis shows that the average pore sizes were measured as 474 ㎛ (450 foam) and 1220 ㎛ (1200 foam). Regardless of the pore size, Fe-Cr-Al foams had a Weaire-Phelan bubble structure, and α-ferrite was the major constituent phase. Tensile and compressive tests were conducted with an initial strain rate of 10<sup>-3</sup>/s. Tensile yield strengths were 3.4 MPa (450 foam) and 1.4 MPa (1200 foam). Note that the total elongation of 1200 foam was higher than that of 450 foam. Furthermore, their compressive yield strengths were 2.5 MPa (450 foam) and 1.1 MPa (1200 foam), respectively. Different compressive deformation behaviors according to the pore sizes of the Fe-Cr-Al foams were characterized: strain hardening for the 450 foam and constant flow stress after a slight stress drop for the 1200 foam. The effect of structural characteristics on the mechanical properties was also discussed.
The treatment and prognosis of benign fibro-osseous lesions of jaw
김규식(Kyoo Sik KIM),김성곤(Seong Gon KIM),김성민(Soung Min KIM) 대한구강악안면외과학회 1995 대한구강악안면외과학회지 Vol.21 No.4
악골에 발생하는 양성섬유골성병소는 예후가 양호하고 섬유이형성증과 구별되는 질환으로 잘알려져있다. 이번 연구의 목적은 본 교실에서 치료된 증례를 중심으로 이들의 임상적, 방사선학적인 특징을 조사하고 치료 후 예후를 추적조사함으로서 이 질환만의 특징과 섬유이형성증과의 관계를 추정해보기 위함이다. 대상은 1984년 1월에서 1994년 3월까지 본 교실에서 양성섬유골성병소로 진단받고 치료받은 증례를 대상으로 하였고 임상병록지와 방사선사진, 조직병리학적인 소견을 참고하였다. 최소 1년에서 최대 11년까지 장기간 추적조사를 시행하였고 통계적 검정은 t-검정을 이용하여 다음과 같은 결과를 얻었다. 1. 양성섬유골성병소는 20대와 30대에 호발하였고, 남녀의 성비는 1:2.2였다. 2. 환자가 주장한 병소의 지속기간은 1년이상이 53.75%로 발병후 장기간 경과한 병소가 대부분이었고, 주소가 종창이었던 경우가 80%로 동통을 호소한 경우는 드물었다. 3. 화골성섬유종의 경우 변연형의 경우가 대부분이었음에 비하여 백악질형성섬유종과 백악골화섬유종의 경우 중심형이 우세하였다. 4. 치료방법은 보존적인 처치를 시행한 경우가 82.5%였고 전체 증례중 재발된 경우는 5%로 이는 치료방법과는 무관하였다. 결론적으로 양성섬유골성병소는 보존적인 방법 후에도 비교적 양호한 예후를 보였으며 재발은 드물었고 악성으로 변화한 증례는 하도 없었다. 이에 본 저자들은 양성섬유골성병소는 섬유아세포가 주된 종양세포로 섬유이형성종보다 분화된 섭유아세포에의한 양성질환으로 생각한다. The benign fibro-osseous lesions (BFO) of the jaw are well known for their good prognosis and their clinical entities defferentiated with fibrous dysplasia. Our objectives of this study are to review these lesions, and confirm their clinical-radiologic-histologic characteristics. We have analyzed the eighty patients who visited in the Dept. of oral and maxillofacial surgery, Seoul National University Hospital, from January 1, 1984 to March 31, 1994 as being diagnosed with benign fibro-osseous lesions. We have compared their clinical features, radiologic findings and treatment methods, and have investigated their individual prognosis. The results were as follows ; 1. The benign fibro-osseous lesions occured frequently in the 3rd to 4th decades, and the ratio of male to female was 1 : 2.2. 2. The subjective duration of lesions more than one year was 53.75%. The chief complaint was swelling in 80% and pain was uncommon. 3. In the case of an ossifying fibroma, the peripheral type was frequent, but in the case of a cementifying fibroma and cemento-ossifying fibroma, the more frequent type was the central. 4. Conservative treatement was used in 82.50% and the recurred cases were 5%. In conclusion, the prognosis of BFO was god after complete enucleation. Recurrence was unusual and malignant change was none. BFO is a more mild lesion than fibrous dysplasia and we suspected that the mesenchymal stem cell is a major contrubuting factor in the development of the lesion.
김규식(Kyoo Sik Kim),민병일(Byong Il Min),남일우(Il Woo Nam),김영균(Yong Gyun Kim),김병린(Byeong Rin Kim) 대한구강악안면외과학회 1988 대한구강악안면외과학회지 Vol.14 No.1
This is a retrospective study on lymphangioma of jaw bone and soft tissue. This is based on pathologic reports and clinical charts of 10 patients treated as inpatient and outpatient at Dept. of Oral and Maxillofacial Surgery, College of Dentistry, Seoul National University between 1980 and 1987. The results obtained are as follows. 1. Age distribution of patient ranged from birth to 19 years of age. 2. The ratio of men to women was 50:50. 3. The most common location of lymphangioma was buccal cheek mucosa (40%), tongue (30%) and gingiva (20%) were next in decreasing order. 4. The most frequent misdiagnosis of lymphangioma was hemangioma (50%). 5. On microscopic view, simple lymphangioma was 70%, cavernous lymphangioma was 20% and hemangiolymphangioma was 10%. 6. The mean duration from patient s fiist recognition of lesion to visiting doctor was 7.2 years. The most chief complaint was multiple small. pebble -like masses (40%). 7. Recurrence: 2 cases (20%).
비소세포폐암 환자의 혈장 DNA를 이용한 Microsatellite 분석
김규식 ( Kyu Sik Kim ),김은정 ( Eun Jung Kim ),김수옥 ( Soo Ock Kim ),오인재 ( In Jae Oh ),박창민 ( Chang Min Park ),정주연 ( Ju Yeon Jeong ),김유일 ( Yu Il Kim ),임성철 ( Sung Chul Lim ),박종태 ( Jong Tae Park ),김영철 ( Young Ch 대한결핵 및 호흡기학회 2005 Tuberculosis and Respiratory Diseases Vol.58 No.4