균질화처리한 AZ31-xCa(x=0~2.0 wt.%) 중력 주조재의 열간압연 특성

임창동,유봉선,김수현,이진수,김완철 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.6

The effects of homogenization on hot rolling properties of gravity cast AZ31-xCa (x=0-2.0 wt.%) alloys were evaluated by examination of surfaces and microstructures of sheets. The side cracking during hot rolling was decreased by homogenization through the elimination of local inhomogeneity and solution of brittle precipitate into matrix. The coarse grains in raw materials were changed to fine grains with the average particle size of 5-10 μm by repeated hot rolling through the dynamic recrystallization. A deformation twinning was more favorably formed in the hot-rolled sheets after homogenization. It is considered that the grains grow and the precipitates are solved into the matrix during homogenization heat treatment, which results in the increased possibility of formation of deformation twinning during hot rolling. (Received March 29, 2004)

호중구 감소성 발열환자에게 경험적으로 투여한 Teicoplanin의 효과

이동건,임동석,최수미,박선희,유진홍,최정현,민우성,신완식,김춘추 대한감염학회 2004 감염과 화학요법 Vol.36 No.2

목적 : 호중구감소성 발열 환자에게 경험적으로 teicoplanin을 투여할 때의 효과를 알아보고자 전향적 연구를 시행하였다. 방법 : 2003년 7월부터 12월까지 가톨릭조혈모세포이식센터에 입원하여 항암치료 혹은 조혈모세포이식을 시행하고 호중구감소성 발열이 있는 환자 중 초기 항균요법에 반응이 없어 경험적 teicoplanin 투여가 필요한 49명을 대상으로 A, B 제조회사에서 제공한 teicoplanin을 무작위로 어느 한 쪽 치료군에 배정하여 투여하였다. 용량은 첫날 400㎎ 부하용량을 정맥내 bolus로 투여하고 매 24시간마다 200㎎ 유지용량을 투여하였다. 결과 : A군 27명, B군 22명이 연구에 참여하였고 대부분의 환자가 신독성이 있는 약제를 병용하고 있었다. A군 8명, B군 7명에서 그람양성균이 동정되었고, teicoplanin에 대한 내성률은 A군 22.2%, B군 28.6%로 유의한 차이는 없었다(P=1.00; 0.61<95%CI<1.95). 미생물학적 확인 감염이 있었던 환자 중 평균 53.3%에서 완치 혹은 개선의 반응이 있었고 양 군간 유의한 차이는 없었다(A군 4명 [50.0%], B군 4명 [57.1%], P=1.00; 0.29<95%CI<2.60). 미생물학적 제거율은 평균 62.5% (A군 55.6%, B군 71.4%)이었고 그 외 미생물학적 효과는 A군에서 제거 후 재발 2명(22.2%), 내성 2명(22.2%)이었고 B군에서 각각 0명(0.0%), 2명(28.6%)이었으며 양 군간 유의한 차이는 없었다(P=0.28). 발열기간(P=0.89), teicoplanin 사용기간(P=0.47) 및 전체적인 사망률(P=1.00; 0.78<95%CI<1.24)도 양 군간 유의한 차이는 없었다. 이상반응 중 신독성은 16.3% (A군 18.5%, B군 13.6%)에서 나타났고 양 군에 차이는 없었으며(P=0.72; 0.39<95%CI<3.51), 신기능 이상과 관련있는 약제를 적어도 2개 이상 병용하고 있었다. 피부발진은 A군에서 1명, B군에서 3명 발생하였다(P=0.31; 0.93<95%CI<1.34). 결론 : 호중구감소성 발열환자에게 teicoplanin을 투여하였을 때 임상적 반응률은 평균 53.3%(A군 50.5%, B군 57.1%), 미생물학적 제거율은 평균 62.5%(A군 55.6%, B군 71.4%)이었고 두 제조회사간 차이가 없었고 이상반응도 양 군간 차이가 없었다. 앞으로 국내 호중구감소증 환자에서의 teicoplanin의 적정 용량, 용법 등을 알기 위한 집단 약동학 등의 연구를 시행할 예정이다. Background : This study was done to elucidate the efficacy of teicoplanin as the empirical treatment for febrile neutropenia. Methods : Patients were randomized to two groups according to pharmaceutical company (company A or B). Total of 49 patients (A, 27; B, 22) with neutropenic fever were studied prospectively for 6 months (Jul. 2003-Dec. 2003). Patients received 400 mg i.v. once, then 200 mg i.v. once daily. Results : Groups were matched for all demographic variables. Most of the patients were concurrently receiving nephrotoxic drugs. Gram positive microorganisms were isolated in 8 patients for A and 7 patients for B. Resistance rate against teicoplanin was 22.2% in A and 28.6% in B (P=1.0; 0.61 < 95% confidence interval [Cl] < 1.95). Among the patients with microbiologically documented infection, clinical cure or improvement was seen in 4 (50%) of 8 patients for A and 4 (57.1%) of 7 patients for B (P=1.00; 0.29 <95%CI <2.60). Bacteriologic efficacy was assessed as follows; elimination in 5 (55.6%), elimination with relapse in 2 (22.2%), resistance in 2 (22.2%) out of 9 gram-positive bacteria for A and 5 (51.4%), 0 (0.0%), 2 (28.6%) out of 7 bacteria for B, respectively (P=Q.28). There were no significant differences in duration of fever, duration of use of teicoplanin, and overall mortality. The incidence of nephrotoxicity and ototoxicity was not significant. Conclusion : For using teicoplanin as the empirical therapy for febrile neutropenia, the rate of clinical, microbiological response, and nephrotoxicity was 53.3%, 62.5%, and 16.3% respectively with no significant differences between the 2 preparations of teicoplanin. Supplementary evaluation on the adequate dose and duration of teicoplanin may be required.

시험관내 심내막염 모델에서 Methicillin 내성 포도구균에 대한 Vancomycin, Arbekacin, Gentamicin 단독 혹은 병합효과

이동건,전혜선,임동석,최수미,최정현,유진홍,신완식,강문원 대한감염학회 2003 감염과 화학요법 Vol.35 No.3

목적 : Methicillin 내성 포도구균(methicillin resistant Staphylococcus aureus, MRSA)은 병원감염의 중요한 원인균으로 vancomycin이 선택약제이다. 그러나 심내막염 등의 중증감염에서는 vancomycin의 치료실패와 함께 최근 내성균도 증가하고 있어 vancomycin을 대체할 수 있는 항균제와 보다 효과적인 항균요법의 개발이 필요하다. 본 연구에서는 사람의 환경과 유사한 시험관내 감염 모델을 적용하여 MRSA 치료를 위한 vancomycin, arbekacin, gentamicin의 단독 및 병합효과를 비교하였다. 방법 : 임상에서 분리된 MRSA 2균주(GRI 53, gentamicin 내성 : GS171, gentamicin 감수성)로 fibrin clot을 제작하여 시험관내 심내막염 모델을 만들어 vancomycin, arbekacin, gentamicin을 단독 혹은 병합주입하였다. 반감기와 최고 및 최저농도는 사람의 약동학을 기준으로 하였다. Vancomycin은 6, 12, 24시간마다 주입하거나 24시간 연속주입하였고 arbekacin은 12, 24시간마다, gentamicin은 8, 24시간마다 주입하였다. 병합주입의 경우 vancomycin은 12시간마다, gentamicin, arbekacin은 24시간마다 투여하였다. 각 투여군의 살균효과는 0, 8, 24, 32, 48, 72시간째의 fibrin clot내 집락수로 측정하였다. 결과 : GRI153에 gentamicin을 주입한 군 이외의 모든 실험군에서 대조군에 비해 의미있게 fibrin clot내 집락수가 감소하였다(P<0.001). Vancomycin과 arbekacin 단독주입군내서 8시간째의 집락수는 GRI153보다 GS171에서 의미있게 낮았고(P=0.02), GS171에 arbekacin 12시간마다 투여한 군의 집락수가 가장 낮았다(P=0.01). 72시간째 집락수는 균주의 종류나 vancomycin 혹은 arbekacin의 투여간격에 따른 차이가 없었다. GRI153에서 vancomycin과 arbekacin의 병합주입군은 24시간까지 상가작용이 있었으나 vancomycin과 gentamicin 병합주입에서는 무관작용이었고 GS171에서도 72시간 동안 무관작용을 보였다. 또한 전 실험기간 동안 내성균은 발현되지 않았다. 결론 : 시험관내 심내막염 모델에서 MRSA에 대한 arbekacin의 항균력은 vancomycin과 유사하여 단독주입이 가능함을 시사한다. Gentamicin 내성균주의 경우 두가지 항균제의 병합주입으로 24시간까지 상가작용을 보이고 있으나 임상에 적용하기 위해서는 추가연구가 필요할 것으로 생각된다. Background : Glycopeptide has been used for the one-and-only treatment of choice in methicillin resistant Staphylococcus aureus (MRSA) infection, but its exclusive use for the MRSA infection has led to the increased risk of glycopeptide-resistance. To find an alternative (s), we employed an in vitro infective endocarditis model (IVIEM) to compare the efficacy of vancomycin (VCM). arbekacin (ABK), and gentamicin (GM) alone or in combination. Methods : Using two strains of clinically isolated MRSA, one GM susceptible (GS171) and the other GM resistant (GR153), fibrin clots were prepared and suspended in IVIEM. Antibiotics were added as a bolus to simulate human pharmacokinetics of regimens, including q 6 h, q 12 h, q 24 h, or continuous infusion with VCM, q 12h or q 24 h with ABK, and q 8 h or q 24 h with GM. In cases of combination, regimens were VCM q 12 h plus ABK q 24 h, and VCM q 12 h plus GM q 24 h. Fibrin clots were removed from each model at 0, 8, 24, 32, 48. and 72 h, and the bacterial densities (in CFU/g) were determined. Results : At 8 hour, the colony counts of GS171 were lower than those of GR153 (P=0.02), and the lowest with the ABK q12h against GS171 (P=0.01). At 72 hour, monotherapy with ABK or VCM produced same degree of bacterial reductions in IVIEM, regardless of dosing frequency or GM-resistance. In the case of GM-resistance, combination of VCM and ABK did show additive effect until 24 hours, although VCM and GM showed no indifference during all the experiments. Development of resistance during experiment was not observed with any regimens. Conclusions : Our data suggest that ABK monotherapy could be used as an alternative to VCM even in the treatment of GM-resistant staphylococcal endocarditis. Further studies will clinical trials are warranted to evaluate the additive effect of VCM and ABK.

Poster Session 3 : Signal Transduction ; Effect of Protein Kinases on TCDD-induced Gene Expression

( Su Jin Yim ),( Hyun Sung Park ) 한국생화학분자생물학회 (구 한국생화학회) 2002 생화학분자생물학회 춘계학술발표논문집 Vol.2002 No.-

Poster Presentations : The MEK - 1 Inhibitor , PD98059 reduces dioxin - induced CYP1A1 expression

(Su Jin Yim),(Jung Ho Suh),(Hyun Sung Park) 서울시립대학교 산업기술연구소 2002 국제학술SYMPOSIUM논문집 Vol.10 No.1

Inhibition of poly(I:C)-induced inflammation by salvianolic acid A in skin keratinocytes

( Su-hyuk Yim ),( Qing-ling Zhang ),( Xue Mei Li ),( Jin Gwi Yoo ),( Dong-kyun Hong ),( Jin-hyup Lee ),( Chong Won Choi ),( Kyung Duck Park ),( Young Lee ),( Chang Deok Kim ),( Young-joon Seo ),( Jeun 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2

Background: Skin keratinocytes participate actively in inducing immune responses when external pathogens are introduced, thereby contributing to elimination of pathogens. However, in condition where the excessive inflammation is occurred, chronic skin disease such as psoriasis can be provoked. Objectives: We tried to screen the putative therapeutics for inflammatory skin disease, and found that salvianolic acid A (SAA) has an inhibitory effects on keratinocyte inflammatory reaction. The aim of this study is to demonstrate the effects of SAA in poly(I:C)-induced inflammatory reaction in skin keratinocytes. Methods: The keratinocytes were pretreated with SAA then stimulated with poly(I:C). Inflammatory reaction of keratinocytes, then we verified using RT-PCR, ELISA and Western blot. Results: When skin keratinocytes were pre-treated with SAA, it significantly inhibited poly(I:C)-induced expression of inflammatory cytokines including IL-1β, IL-6, IL-8, TNF-α, and CCL20. SAA inhibited poly(I:C)-induced activation of NF-κB signaling. And SAA also inhibited inflammasome activation, evidenced by decrease of IL-1β secretion. Finally, SAA markedly inhibited poly(I:C)-induced NLRP3 expression. Conclusion: These results demonstrate that SAA has an inhibitory effect on poly(I:C)-induced inflammatory reaction of keratinocytes, suggesting that SAA can be developed for the treatment of inflammatory skin diseases such as psoriasis.

Poster Session 3 : Signal Transduction ; Regulation of dioxin-induced expression of cyplal by Mek-1/p42 MAPK pathway

( Su Jin Yim ),( Myoung Seok Oh ),( Hyun Sung Park ) 한국생화학분자생물학회 (구 한국생화학회) 2003 생화학분자생물학회 춘계학술발표논문집 Vol.2003 No.-

Gomisin N isolated from Schisandra chinensis significantly induces anti-proliferative and pro-apoptotic effects in hepatic carcinoma.

Yim, Su Youn,Lee, You Jin,Lee, Yoen Kyung,Jung, Seung Eun,Kim, Ji Ha,Kim, Hak Jin,Son, Beung Gu,Park, Young Hoon,Lee, Young Guen,Choi, Young Whan,Hwang, Dae Youn D. A. Spandidos 2009 MOLECULAR MEDICINE REPORTS Vol.2 No.5

<P>Lignans isolated from Schisandria chinensis have been prescribed as anti-cancer and anti-hepatitis treatments in Chinese medicine. To investigate the applications of lignans isolated from Schisandria chinensis in hepatic carcinoma therapy, their apoptotic ability was screened using a cell proliferation assay. Compared to the other lignans, gomisin N induced high apoptotic levels in hepatic carcinoma. Cell morphology and flow cytometric analysis demonstrated that this lignan induced cell death at high concentrations, but did not induce any changes at low concentrations. In addition, the expression levels of Bcl-2 and Bax proteins, which are involved in the apoptotic pathway, were markedly increased in only the 320 ?M-treated group compared to the vehicle and other concentration groups, while the expression level of p53 protein remained unchanged in this group. These results suggest that gomisin N is an anti-cancer drug candidate capable of inhibiting the proliferation and inducing the apoptosis of human hepatic carcinomas.</P>

증례 : 순환기 ; 좌심실 부전과 심낭 압전을 유발한 급성 화농성 심낭염 1예

최수진 ( Su Jin Choi ),정우백 ( Woo Baek Chung ),김현진 ( Hyun Jin Kim ),임선미 ( Sun Mie Yim ),최윤석 ( Yun Seok Choi ),박철수 ( Chul Soo Park ),이만영 ( Man Young Lee ) 대한내과학회 2012 대한내과학회지 Vol.82 No.2

호흡곤란을 주소로 내원한 85세 남자 환자에서 폐렴과 동반한 심비대 소견이 관찰되었고, 심초음파 소견에서 중등도의 심낭 삼출액으로 인한 삼출성 협착 심낭염과 중증의 좌심실 부전이 관찰되었다. 입원 경과 중 심인성 쇼크로 진행하였고, 수축촉진제(inotropic agent) 투여 및 IABP 삽입하여도 쇼크 상태가 회복되지 않았으나, 심낭 천자 및 배액술을 시행한 후 즉시 활력 징후가 안정화되었다. 심낭 삼출액 배양 검사에서 폐렴구균(Streptococcus pneumoniae)이 동정되었다. 항생제 개발 이후 폐렴구균에 의한 심낭염은 매우 드문것으로 알려져 있고, 좌심실 부전까지 유발하는 경우는 보고된 바가 없었다. 저자들은 급성 화농성 심낭염으로 인하여 중등도 심낭 삼출 및 심낭 압전과 좌심실 부전을 경험하였기에 문헌고찰과 함께 보고하는 바이다. An 85-year-old male visited our hospital because of dyspnea. Chest radiography showed marked cardiomegaly and pneumonic infiltration. Transthoracic echocardiography showed moderate pericardial effusion, which resulted in effusive constrictive pericarditis and severe left ventricular systolic dysfunction. During the hospital course, the patient developed cardiogenic shock and was treated with an inotropic agent and intra-aortic balloon pump. The patient`s vital signs were stabilized after pericardiocentesis and drainage. A yellowish purulent pericardial effusion was drained and Streptococcus pneumoniae was isolated. Bacterial purulent pericarditis was not uncommon before the antibiotics era, but it is extremely rare nowadays. Here, we report a case of purulent bacterial pericarditis presenting with severe left ventricular systolic dysfunction and cardiac tamponade. (Korean J Med 2012;82:221-226)

국내산 소나무의 APMP 기술 최적화 연구

임수진(Su-Jin Yim),김철환(Chul-Hwan Kim),이지영(Ji-Young Lee),조후승(Hoo-Seoung Jo),이지영(Ji-Young Lee),이경선(Gyeoung-Sun Lee),남혜경(Hye-Kyoung Nam),정성현(Sung-Hyun Jung),이창기(Chang-Gi Lee),이종규(Jong-Gyu Lee) 한국펄프·종이공학회 2014 한국펄프·종이공학회 학술발표논문집 Vol.2014 No.4