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$Ba2(Ti_{8.472}Zr_{0.528})O_{20}$의 결정구조와 유전특성
백남석,이헌식,조남웅,박성,이병하,Baik, Nam-Seok,Lee, Hun-Sik,Tho, Nam-Woong,Park, Sung,Lee, Byung-Ha 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.1
A single phase Ba2(Ti8,472Zr0.528)O20 was prepared by the oxalate method from aqueous solution of BaCl2 TiCl4 and ZrOCl2. The structure ananlysis has been carried out by Rietveld analysis method at room temperature. Powder X-ray data of Ba2(Ti8,472Zr0.528)O20 was indexed with the triclinic lattice(a=7.4587 $\AA$ b=14.0672 $\AA$, c=13.3327 $\AA$, $\alpha$=89.87, $\beta$=79.45 ${\gamma}$=84.46) The R (Residual) values of structure refinement were in a range between 10.00 and 8.00 This analysis proved that the added Zr occupied Ti sites in th structure of Ba2Ti9O20. Ba2(Ti8,472Zr0.528)O20 has excellent dielectric properties(dielectric constant K=40.49 at 5.42 GHz Q=4621) so that it can be used as good microwave dielectric materials.
석준호 ( Jun Ho Seok ),박종선 ( Jong Seon Park ),김영조 ( Young Jo Kim ),김기식 ( Kee Sik Kim ),허승호 ( Seung Ho Hur ),채성철 ( Shung Chul Chae ),박헌식 ( Hun Shik Park ),차광수 ( Kwang Soo Cha ),김무현 ( Mooh Hyun Kim ),김영대 ( 대한내과학회 2002 대한내과학회지 Vol.63 No.5
Background : Aneurysms of sinus Valsalva are rare anomalies thought to be primarily congenital in origin. To evaluate the clinical features and surgical results associated with ruptured aneurysm of sinus of Valsalva, we reviewed the clinical characteristics and follow up results of the patients. Methods : From January, 1991, through June 2001, 33 patients with ruptured aneurysm of sinus of Valsalva underwent surgical correction from the above five university hospitals. The patients included 24 men and 9 women, with a mean age of 32±13 years. We reviewed symptoms, physical examination findings, ECG findings, the coexistent cardiac anomalies, echocardiographic findings, surgical results in 33 patients.Results : Patterns of fistula tract were right coronary sinus-right ventricle in 24 patients (73%), noncoronary sinus- right atrium in 3 patients (9%), noncoronary sinus - right ventricle in 3 patients (9%), right coronary sinus - right atrium in 2 patients (6%) and right coronary sinus ?right ventricle and right atrium in 1 patient (3%). Combined cardiac anomalies were VSD (20 cases; 61%), ASD (1 case; 3%) and PDA (1 case; 3%). But, only 12 cases of VSD (60%) were diagnosed with preoperative transthoracic echocardiography. The aneurysmal sacs were excised in all patients and the defects were closed with a patch in 21 patients (64%) and without patch in 12 patients (36%). No recurrence was observed during follow-up periods (68±38 months) for all survivors and there was no late complications or symptoms. Conclusion : In sinus of Valsalva aneurysm patients, combined cardiac anomalies, especially VSD, are common. Careful preoperative echocardiography should be performed to detect combined anomalies. And, surgical results are excellent without recurrence.(Korean J Med 63:532-538, 2002) Key Words : Sinus of Valsalva, Aneurysm, Combined anomalies
게이트 심근관류 SPECT상 운동 유발성 기절심근을 보이는 환자의 운동부하 심전도, 관류 SPECT 및 심혈관 조영술 소견
안병철 ( Byeong Cheol Ahn ),서지형 ( Ji Hyoung Seo ),배진호 ( Jin Ho Bae ),정신영 ( Shin Young Jeong ),박헌식 ( Hun Sik Park ),이재태 ( Jae Tae Lee ),채성철 ( Shung Chull Chae ),이규보 ( Kyu Bo Lee ) 대한핵의학회 2004 핵의학 분자영상 Vol.38 No.3
목적: 관상동맥질환을 가진 환자에서는 운동부하 후 일시적인 심근기절로 인하여 좌심실의 벽운동이상과 좌심실구혈률 감소가 발생될 수 있다. 본 연구는 운동 후 좌심실기능저하를 보이는 환자와 그렇지 않은 환자의 관상동맥조영술과 운동부하 심근관류 SPECT 소견을 비교분석 하고자 하였다. 대상 및 방법: 운동부하심전도, 관상동맥조영술 및 심근관류 SPECT를 시행한 환자 중 게이트 SPECT로 구한 좌심실구혈률이 운동 후 5%이상 감소된 36명 (기절심근군)과 Purpose: Transient wall motion abnormality and contractile dysfunction of the left ventricle (LV) can be observed in patients with coronary artery disease due to post-stress myocardial stunning. To understand clinical characteristics of stress induced LV
관상동맥질환에서 운동부하 Tc - 99m Tetrofosmin 심근스캔의 진단적 유용성 : 운동부하심전도검사와의 비교
최지용(Ji Yong Choi),황진용(Jin Yong Hwang),황종현(Jong Hyeon Hwang),임현주(Hyeon Ju Lim),박헌식(Hun Sik Park),조용근(Yong Keun Cho),채성철(Shung Chull Chae),전재은(Jae Eun Jun),박의현(Wee Hyun Park),안병철(Byeong Cheol Ahn),이재태(J 대한내과학회 1997 대한내과학회지 Vol.53 No.6
Objectives: Tetrofosmin is a new Tc-99m labeled myocardial perfusion imaging agent that shows slow clearance from the myocardium and rapid clearance from background organs. The purpose of this study was to assess the ability of exercise Tc-99m tetrofosmin single photon emission computed tomography(SPECT) to identify and localize coronary artery disease. Methods : The study population consists of 49 patients with suspected coronary artery disease who underwent both exercise Tc-99m tetrofosmin SPECT and coronary angiography within 2 weeks. Using the one day imaging protocol, 7-10mCi of Tc-99m tetrofosmin was injected at rest and 4 hours later, 25 mCi of Tc-99m tetrofosmin was injected at peak exercise. Results: The sensitivity and specificity of exercise Tc-99m tetrofosmin SPECT was 94.9% and 60% for detection of coronary artery disease with luminal narrowing more than 50%, and 96.4% and 33.3% for detection of coronary artery disease with luminal narrowing more than 70%. The sensitivity of exercise Tc-99m tetrofosmin SPECT for detection of individual stenosed vessels(≥50% and ≥70% coronary stenosis) was 79.2%, 100% for LAD, 55.6%, 55.6% for LCx and 85.0%, 92.9% for RCA and the specificity was 88.0%, 75.0% for LAD, 100%, 87.5% for LCx, 86.2%, 77.1% for RCA respectively. Conclusion: Exercise Tc-99m tetrofosmin SPECT appears to be an feasible and useful noninvasive test for the diagnosis of coronary artery disease
급성 심근경색 환자에서 예후 예측인자로 혈청 감마-글루타밀 트랜스퍼라제가 유용한가?
이장훈 ( Jang Hoon Lee ),채성철 ( Shung Chull Chae ),이현상 ( Hyun Sang Lee ),박용휘 ( Yong Whi Park ),류현민 ( Hyeon Min Ryu ),이순학 ( Soon Hak Lee ),배명환 ( Myung Hwan Bae ),양동헌 ( Dong Heon Yang ),박헌식 ( Hun Sik Park ) 대한내과학회 2007 대한내과학회지 Vol.72 No.3
Background: Serum gamma-glutamyl transferase activity (GGT) is able to catalyse low-density lipoprotein oxidation in coronary atherosclerotic plaques and has a role in the pathogenesis of atherosclerosis. GGT has been shown to be an independent risk factor for cardiac mortality in patients with a previous myocardial infarction. The purpose of this study is to determine the prognostic value of GGT within its normal range at an acute stage in patients with acute myocardial infarction. Methods: In a retrospective study, GGT and other cardiac risk factors were evaluated in 192 patients (M/F=143/49; mean age: 60.8±11.8 years) who were diagnosed with an acute myocardial infarction at the emergency room. We compared the serum GGT values for each patient with or without a cardiac event, including cardiac death, non-fetal myocardial infarction and unstable angina, after an acute myocardial infarction for a mean follow-up of 16.5±10.8 months. Results: During the follow-up period, 17 patients underwent cardiac death and experienced an acute myocardial infarction and 23 patients had unstable angina. Although the mean GGT values were significantly different from patients with cardiac events (29.5±10.0 U/L vs 25.0±11.2 U/L, p=0.024), serum GGT was not an independent cardiac risk factor for a cardiac event based on multivariate analysis adjusted for age, sex, alcohol and known cardiovascular risk factors. Conclusions: Serum GGT within its normal range at an acute stage in patients that experienced an acute myocardial infarction is not an independent prognostic marker. (Korean J Med 72:281-289, 2007)
Flecainide 독성과 관련된 치명적인 심실상빈맥의 1예
천상수 ( Sang Soo Cheon ),송준혁 ( Joon Hyuk Song ),배명환 ( Myung Hwan Bae ),이장훈 ( Jang Hoon Lee ),양동헌 ( Dong Heon Yang ),박헌식 ( Hun Sik Park ),채성철 ( Shung Chull Chae ) 대한내과학회 2014 대한내과학회지 Vol.87 No.1
Flecainide acetate is a potent class Ic anti-arrhythmic drug with a major sodium channel-blocking effect. Flecainide toxicity can cause myocardial impairment and precipitate circulatory collapse, particularly in patients with renal failure. Electrical and hemodynamic deterioration during flecainide toxicity may not respond to conventional treatments. We report the successful management of flecainide toxicity using extracorporeal membrane oxygenation (ECMO), hemoperfusion, and bicarbonate administration maintaining alkalinity. (Korean J Med 2014;87:72-76)
조용근,황진용,박헌식,채성철,전재은,박의현 慶北大學校 醫科大學 1996 慶北醫大誌 Vol.37 No.4
목적 : 정량적관상동맥조영술이 최근 널리 보급되고 있지만 국내외를 막론하고 이의 정확도 및 재현도에 관한 연구가 불충분하여 본 연구를 하였다. 대상 및 방법 : 110명의 환자에서 미국 General Electric사의 Advantx L/C/LP 디지탈혈관찰영기와 미국 USCI사의 좌관상동맥용 Judkins형의 Pro-Flo XT^(TM) 6F 도자를 이용하여 좌관상동맥조영술을 같은 각도에서 3회 실시하고 도자의 외경을 일본 Mitutoyo사의 정밀도 0.01㎜의 micrometer로 측정한 후 측정된 도자의 실제 직경과 정량적관상동맥조영술로 측정된 관상동맥의 직경을 비교하였다. 결 과 : USCI® Pro-Flo XT^(TM) 6F 좌관상동맥용 도자의 실제 외경은 1.91±0.03㎜이었고 정량적관상동맥조영술로 측정 한 도자의 외경은 1.94±0.11㎜이었다. 도자를 5.7F로 calibration했을 매 도자의 외경은 1.87±0.12㎜이었다. 세번 다 다른 화상에서 측정한 경우 근위부관상동맥 직경의 차이는 0.02±0.12㎜이었고 같은 화상에서 3회 측정하였던 경우에는 0.11±0.01㎜이었다. 결론 : 정량적관상동맥조영술의 정확도 및 재현도는 사용에 적합한 정도이나 적지 않은 문제점에 대한 보완이 필요하다고 생각된다. During quantitaive coronary angiography(QCA), contrast filled catheter is usually used as a scaling device. However the real diamerer of catheter is almost always smaller than the listed diameter. We measured the real diameter of catheters with precision micrometer(Mitutoyo® Japan). After caliberating the catheter as listed French size and diameter, we did QCA at the same tube position of the diameters of catheter and proximal left coronary artery. All measurements were done 3 times consecutively. The mean real diameter of USCI® Pro-Flo XT^(TM) 6 F left Judkin catheter was 1.91±0.03 ㎜. The mean QCA diamter of the same catheter was 1.94±0.11 ㎜. When we calibrated catheter as 1.91 ㎜. the mean QCA diameter was 1.87±0.12 ㎜. The mean differences of the diameters of the proximal left coronary artery were 0.20±0.12 ㎜ when the measurements were done in three different frames. When the measurements were done in the same frmae, the mean difference decreased to 0.11±0.01 ㎜. We conclude that the precision and reproducibility of QCA are within reasonable range, but more refimement is needed.