공명위치에 따른 ECR 플라즈마의 에너지 변화

김필수,김남성,안무선 漢陽大學校 自然科學硏究所 1996 自然科學論文集 Vol.15 No.-

ECR 플라즈마는 낮은 기체압력, 높은 이온밀도 및 낮은 이온에너지 등의 특성을 가지고 있어 저손상, 미세회로 및 신소재 개발공정의 유력한 수단으로 인식되고 있다. 본 연구에서는 공명위치에 따른 N₂ECR 플리즈마의 전자에너지를 조사하였다. N₂ECR플라즈마의 전자에너지는 보통 28eV∼30eV정도를 나타내었으나 상단코일의 자기장이 강하고 하단코일의 자기장이 약한 경우 전자에너지는 약50eV로 크게 나타났다. 공명점의 갯수는 플라즈마 에너지에 기여하지 않는 것으로 나타났으며 이로부터 첫 번째 공명위치에서 대부분의 전자에너지 공명흡수가 발생함을 알 수 있었다. 하단코일의 자기장이 약한 경우 높은 전자에너지를 가지는 이유는 낮은 자기장에 의하여 반사된 초고주파가 다시 공명흡수에 기여하기 때문으로 풀이된다. ECR plasma, having its characteristics of low gas pressure, low ion energy and high ion density, has become one of useful means to research and development for new materials and microeletronic circuits with low loss. This study deals with the characteristics of N₂ECR plasma on the variation of ECR plasma energy with resonance positions. Especially, ECR plasma energy affected by the resonance positions has been investigated. Most of the electron energies of N₂ECR plasma with various resonance positions are recorded 28eV∼30eV. But in case of strong magnetic field in the upper side coil and weak magnetic field in the lower side coil, the electron energies are measured up to 50 eV. The number of resonance positions does not contribute to the plasma energy. This result implies the resonance absorption of the electron energy is generated mainly at the first resonance position. It is shown that the high electron energy appears when magnetic field in the lower side coil is weak. This makes it possible to deduce that the UHF microwave reflected by the weak magnetic field influences the resonance absorption again.

대동맥 판막 치환술 후 반복되는 Acinetobacter baumannii 균혈증의 원인이 된 대동맥염 1예

정용필,김성철,송은희,장은영,김은경,김윤지,성흥섭,김미나,최상호,우준희,김양수 대한감염학회 2007 감염과 화학요법 Vol.39 No.3

감염성 대동맥염은 흔하지 않지만 매우 위중한 질병으로 Salmonella so.와 S. aureus가 주된 원인균이다. 아직까지 병원내 감염의 주요 원인균인 Acinetobacter baumannii에 의한 감염성 대동맥염은 보고된 바가 없었다. 저자들은 대동맥 판막 치환술을 시행받은 76세 남자 환자에서 적절한 항생제 투여에도 반복되는 A. baumannii 균혈증의 원인이 감염성 대동맥염으로 진단되었던 1예를 경험하였기에 보고하는 바이다. Infectious aortitis is an uncommon yet, life threatening disease. Early surgical treatment and prolonged antibiotic therapy is crucial to survival. Salmonella sp. and Staphylococcus aureus are the most common organisms isolated. There is no case report of infectious aortitis caused by Acinetobacter baumannii, which has recently emerged as a major cause of health care-associated infections. Here, we describe a 76-year-old male with infectious aortitis who experienced recurrent bacteremia due to A. baumannii in spite of adequate antimicrobial therapy after aortic valve replacement.

공기중의 Radon 방사능 측정에 의한 서울 대기의 혼합높이 결정

김의훈,김필수,김채옥,이건상,권기덕 漢陽大學校 環境科學硏究所 1985 環境科學論文集 Vol.6 No.-

서울 대기의 혼합높이를 1984년1월부터 4월 사이에 지표고도에서 측정한 ??으로부터 결정하였다. ?? 농도로부터 상당혼합높이를 계산하기 위하여 한 수식 모델을 개발하였다. 이로부터 계산한 상당혼합높이는 늦은 오후에 최고 및 밤 또는 이른 아침에 최저값을 가지며 수 십 미터에서 1킬로미터 또는 그 이상의 높이를 보이는 일변화를 나타냈다. 평균혼합높이는 겨울이 낮았다. 이와 같은 변화는 대기의 안정도, 일조시간, 기온 등 대기의 인자와 밀접한 관계가 있었다. The mixing heigt of the atmosphere in Seoul was determined from the measurement of ?? concentration in air at ground level for January 1984 to April 1984. In order to calculate the equivalent mixing height from ?? concentration, a mathematical model was developed. The equivalent mixing heights calculated from this model showed diurnal variation with the highest values in the late afternoon and the lowest during night hours or early morning ranging from several tens to one thousand meters or more. The average heights represented lower values in the winter. These variations were closely related to the atmospheric factors, such as atmospheric stability, daytime hour, and temperature, etc.

Effect of Highly Pressurized Hydrogen Gas Charging on the Hydrogen Embrittlement of API X70 Steel

Dong-Su Bae,Chi-Eun Sung1,Hyun-Ju Bang,Sang-Pill Lee,Jin-Kyung Lee,In-Soo Son,조영래,Un-Bong Baek,Seung-HoonNahm 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4

During the use of API X70 steel as a pipeline structural material for the transportation of natural gas,hydrogen embrittlement can occur due to the hydrogen contained in natural gas. The aim of this study is toinvestigate the effects of the hydrogen content under high-pressure hydrogen gas conditions on the hydrogenembrittlement of air-cooled API X70 steel. The air-cooled API X70 steel was manufactured by hot rollingand was then air-cooled to room temperature. Tensile test specimens were held for 0 h, 1000 h, and 2000 hwithin a pressure vessel filled with 100% hydrogen gas at a gas pressure of 10 MPa, with the tensile teststhen performed at room temperature. The microstructure of the API X70 steel consists of coarse polygonalferrite, coarse pearlite, and fine acicular ferrite. The yield and tensile strength increased and elongationdecreased considerably after a holding time of 2000 h compared to those of 0 h and 1000 h within the pressurevessel. The morphology of the fracture surface changed from ductile to brittle upon hydrogen gas charging. Secondary cracks were observed in both of the hydrogen-gas-charged specimens. No external cracks wereformed on the surface of the tensile-tested specimen with a 0 h holding time; however, many external crackswere observed on the specimen surface subjected to hydrogen gas charging.

Mycobacterium intracellulare에 의한 요추부 척추염 1예

장은영,김미영,김정욱,송은희,백관미,정용필,성흥섭,김미나,김양수,우준희,이상호 대한감염학회 2007 감염과 화학요법 Vol.39 No.3

비결핵성 미코박테리아에 의한 척추염에 대한 증례 보고가 국내에서는 아직 없었다. 저자들은 기저질환이 없는 환자에서 M. intracellulare에 의한 척추염을 rpoB 유전자에 대한 PCR-RFLP 방법을 통해 진단하였고 수술적 치료와 3제 병합 항균 요법으로 성공적인 임상 경과를 보인 1예를 경험하였기에 보고하는 바이다. We report a case of vertebral osteomyelitis due to Mycobacterium intracellulare in a 60-year-old man without predisposing conditions. He was successfully treated with surgical excision of the inflamed tissue and combined antimycobacterial therapy consisting of clarithromycin, ethambutol, and rifampin. In this case, polymerase chain reaction-restriction fragment length polymorphism analysis (PCR-RFLP) based on the rpo B gene of cultured isolates allowed rapid identification of M. intracellulare. Although very rare, nontuberculous mycobacteria (NTM) should be suspected as a causative pathogen of vertebral osteomyelitis. To the best of our knowledge, this is the first case of vertebral osteomyelitis caused by NTM reported in the Korean literature.

Bonding Interface Properties of Duo-casted Clad Materials

Sang-Pill Lee,In-Soo Son,Jin-Kyung Lee,Dong-Su Bae 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11

Association of blood glucose at admission and outcomes in patients treated with therapeutic hypothermia after cardiac arre

( Soo Hyun Kim ),( Sang Hoon Oh ),( Seung Pill Choi ),( Kyu Nam Park ),( Chun Song Youn ) 대한응급의학회 2013 대한응급의학회 학술대회초록집 Vol.2013 No.2

Background: It is well known that hyperglycemia is associated with poor outcomes in critically ill patients. We investigated the association between blood glucose level at admission and outcomes of patients treated with therapeutic hypothermia after cardiac arrest. Methods: We performed a multicenter retrospective registry-based study of adult OHCA patients treatedwith TH presenting to 24 hospitals across South Korea during the period from January 2007 to December2012. We examined the association of blood glucose at admission on survival and neurologic outcome at hospital discharge. Neurologic outcome was assessed with Cerebral Performance Category (CPC) and favorable neurologic outcome was defined CPC score of 1 and 2. Results: Of a total of 930 OHCA patients entered in the registry, 883 patients were analyzed in this study. The mean age of the sample was 56.7±16.2 years, 69.5% of subjects were male and mean blood glucose at admission was 14.1±7.0 mmol/L.In univariate analysis there were an association between glucose level at admission and favorable neurologic outcome (OR, 0.958; 95% CI, 0.934-0.983) and survival (OR, 0.965; 95% CI, 0.945-0.986). After adjustment for sex, age, history of diabetes mellitus, hypertension, renal disease and stroke, time from arrest to ROSC, initial rhythm, witness status, bystander CPR, cause of arrest and adrenaline, this association still remained: for favorable neurologic outcome (OR, 0.958; 95% CI, 0.921-0.997) and for survival (OR, 0.974; 95% CI, 0.952-0.996). Conclusion: These results show that blood glucose level at admission is associated with survival and favorable neurologic outcome at hospital discharge in patients treated with therapeutic hypothermia after cardiac arrest. Blood glucose level at admission may be a surrogate marker of ischemic insult severity during cardiac arrest. However, randomized controlled evidences are needed to address the significance of a tight glucose control during therapeutic hypothermia after cardiac arrest.

Identification of Offspring Derived from ET and AI Using the Genetic Polymorphisms of Microsatellite and Coat Color Related Genes in Jeju (Korea) Black Cattle

Sang-Hyun Han,Byoung-Chul Yang,Moon-Suck Ko,Young-Hoon Kim,Nam-Hyung Kim,Eun-Young Kim,Se-Pill Park,Sung-Soo Lee 한국동물생명공학회(구 한국동물번식학회) 2009 Reproductive & developmental biology Vol.33 No.2

Coat Color Patterns and Genotypes of Extension and Agouti in Hanwoo and Jeju Black Cattle

Sang-Hyun Han(한상현),In-Cheol Cho(조인철),Jae-Hwan Kim(김재환),Moon-Suck Ko(고문석),Young-Hoon Kim(김영훈),Eun-Young Kim(김은영),Se-Pill Park(박세필),Sung-Soo Lee(이성수) 한국생명과학회 2011 생명과학회지 Vol.21 No.4

소의 Extension(E), Agouti(A) 유전자형과 모색유전양상의 연관관계를 이해하기 위해, 한우와 제주흑우(JBC), 이들 사이에서 생산된 교배후손에서 melanocortin-1 receptor( MC1R)과 agouti signaling protein( ASIP)의 유전자형을 분석하였다. 흑모색의 JBC에서는 세 가지 MC1R대립인자들(E<SUP>D</SUP>, E?, e)이 모두 발견되었다. JBC 집단은 한우에서 우점적으로 나타나는 열성동형접합자(e/e)가 발견되지 않았다. 반면, MC1R E?/e한우는 흑모색이 아닌 갈색이나 적색의 모색을 나타내었다. ASIP유전자에서, 한우에서는 L1-BT 전위인자의 삽입/결실에 의해 세 가지 유전자형(A/A, A/A<SUP>Br</SUP>, A<SUP>Br</SUP>/A<SUP>Br</SUP>)이 모두 관찰되었다. JBC 집단에서는 ASIP A<SUP>Br</SUP> 대립인자가 드물게 관찰되고, ASIP A<SUP>Br</SUP>/A<SUP>Br</SUP> 동형접합인 개체들은 발견되지 않았다. ASIP A<SUP>Br</SUP> 대립인자를 보유하더라도 한우와 JBC, 이들의 교배후손에서도 agouti-유사 얼룩무늬 모색은 발견되지 않았다. 교배후손의 모색은 Agouti 유전자형과는 무관하고, Extension유전자형과 직접적으로 연관되어 황-갈색(e/e)과 암-갈/흑색(E?/e)으로만 구분되었다. ASIP유전자형은 아마도 한우 또는 교배 후손에서 모색의 발달에 영향이 없는 것으로 추정된다. 본 연구 결과는 한우, 제주흑우, 이들의 교배후손에서 MC1R유전자형이 모색 표현형을 결정하며, ASIP유전자형은 모색의 변이에는 핵심적인 역할을 수행하지 않는다는 것을 시사한다. To understand the relationship between coat color inheritance patterns and genotypes of Extension( E) and Agouti( A) loci in cattle, the genotypes for melanocortin-1 receptor( MC1R) and agouti signaling protein ( ASIP) were analyzed in Hanwoo, Jeju black cattle (JBC), and their crossbred progeny. Three MC1R alleles ( E<SUP>D</SUP>, E?, and e) were found in the black-colored JBC population. JBC had no recessive homoygotes (e/e), but this genotype was predominant in the Hanwoo breed. However, MC1R E?/eHanwoo did not produce a black coat color as they appeared either as brown or solid red. For ASIP, three genotypes ( A/A, A/A<SUP>Br</SUP>, and A<SUP>Br</SUP>/A<SUP>Br</SUP>) were determined by insertion/deletion of an L1-BT element in Hanwoo. The ASIP A<SUP>Br</SUP> allele was rarely observed, and no ASIP A<SUP>Br</SUP>/A<SUP>Br</SUP> homozygotes were detected in the JBC population. Cattle carrying ASIP ABr did not show any agouti-like brindle pigmentation patterns in either breed or their progeny. The coat colors of the crossbred progeny were discriminated by two colors, yellowish-brown versus dark-brown or black, and their coat colors were directly related to the genotypes of the Extensionlocus, yellowish-brown (e/e) and dark-brown or black (E?/e), but not to the Agouti locus. ASIP genotypes probably did not affect coat color development in the Hanwoo or crossbred progeny. Our results suggest that the ASIP genotypes do not play key roles in coat color variation, but the MC1R genotypes do direct the phenotypes of Hanwoo, JBC, and their progeny.

Effect of Hydrogen Charging on the Mechanical Properties of 304 Stainless Steels

Sang-Pill Lee,Seung-Kuk Hwang,Jin-Kyung Lee,In-Soo Son,Dong-Su Bae 한국동력기계공학회 2015 동력시스템공학회지 Vol.19 No.5