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Pb(Zr,Ti)O3 세라믹스에서 Bi계 세라믹스의 치환에 따른 상전이 온도 변화
이성찬,왕림,여홍구,조종호,성연수,김명호,송태권 한국물리학회 2009 새물리 Vol.58 No.5
Pb(Zr,Ti)O3 (PZT)의 상경계영역 (MPB) 조성에 Bi(Zn1/2Ti1/2)O3와 BiAlO3를 치환하면서 압전 및 유전특성을 조사하였다. 시편은 일반적인 고상반응법으로 제조하였고 X-선회절패턴을 통해 페로브스카이트 구조를 확인하였다. Bi계 세라믹스가 치환됨에 따라 큐리온도(TC)는 치환되지 않은 PZT의 큐리온도에 비해 감소하였다. 압전상수 (d33))와 전기기계결합계수 (Kp)의 값은 Bi(Zn1/2Ti1/2)O3와 BiAlO3을 각각 5mol% 치환하였을 경우에 가장 높은 값을 나타내었고 그 이후 치환량에 따라 감소하였다. The dielectric and piezoelectric properties of (1−x)Pb(Zr,Ti)O3-xBi(Me)O3 (Me: Zn, Ti, Al) ceramics with morphotropic phase boundry (MPB) composition were investigated. All samples were prepared by using a conventional solid state reaction method and were confirmed to have a perovskite structure by using X-ray diffraction. The Curie temperature of the Pb(Zr,Ti)O3 ceramics decreased with Bi(Me)O3 substitution. The maximum values of the piezoelectric constant (d33) and the electromechanical coupling coefficient (Kp) were obtained at 5 mol% Bi-based ceramics substitutions, after which the values decreased.
정상 갑상샘 기능을 가진 소아청소년에서 비만과 갑상샘 호르몬과의 연관성
이성찬,고수영,이재희,김은영 조선대학교 의학연구원 2017 The Medical Journal of Chosun University Vol.42 No.4
As the number of obese patients increases, childhood obesity also increases and it is recognized as a big problem because it increases the incidence of hypertension, hyperlipidemia, diabetes and metabolic syndrome. Although thyroid hormone abnormalities sometimes exist in obese patients without thyroid disease, there is still much controversy on the impact of obesity on thyroid hormone test results. Accordingly, the present study investigated the correlation between obesity and thyroid hormone concentrations in children with normal thyroid function. In the present study, 356 patients aged 6-18 years who visited the Chosun University Hospital were randomly selected, after exclusion of those with thyroid disease, diabetes mellitus, kidney disease, those with a history of smoking and drinking, and those taking steroids or lipid lowering agents. There were no significant differences in levels of thyroid stimulation hormone (TSH) and free thyroxin (fT4) between males and females. The patients were divided into groups based on serum TSH concentration: group A with TSH < 4.0 μIU/mL and group B with TSH ≥ 4.0 μIU/mL (upper level of normal range). BMI z score, ALT, rGTP, and total cholesterol were significantly higher in group B. Multiple regression analysis adjusted for age, gender, birth weight, and pubertal development showed that TSH and BMI z score were positively correlated, while fT4 was not correlated with other factors.
이성찬 대한외상학회 1996 大韓外傷學會誌 Vol.9 No.2
This report is a retrospective clinical study of the total 160 patients who were admitted to the Surgical Department, Inchon Medical Center with emergent intra-abdominal condi- tion due to abdominal trauma during 6 years & 4 months period from August 1990 to November 1996. We obtained the following results; 1) Total 167 cases of emergent intra-abdominal conditions due to abdominal trauma were composed of 36 cases(21.5%) of abdominal wall contusion only, 7 cases(4.2%) of lacer- ation in abdominal wall(no penetration into peritoneal cavity), 74 cases(44.3%) of panperitonitis, and 50 cases(30.0%) of hemoperitoneum(more than 2,000 cc of intraperitoneal blood). 2) Total 170 cases of emergent intra-abdominal conditions due to abdominal trauma could be divided into 137 cases(81%) of blunt trauma and 33 cases(19%) of penetrating trauma. In 137 cases of blunt trauma, there were 36 cases of abdominal wall contusion only(most common), 32 cases of small bowel rupture(2nd most common), 17 cases of splenic laceration (3rd most common), 16 cases of mesenteric tearing (4th most common), 11 cases of colon rupture, 7 cases of duodenal rupture, 6 cases of liver laceration, etc. 3) In 33 cases of penetrating trauma, there were 9 cases of abdominal wall penetration(without intra-abd. Organ damage) (most common), 7 cases of laceration in abdominal wall (without penetration into peritoneal cavity) (2nd most common), 5 cases of stomach rupture(3rd most common), 3 cases of small bowel rupture, 2 cases of liver laceration, etc. 4) Out of the 74 cases of panperitonitis due to abdominal trauma, there were 35 cases(47%, most common) of small bowel rupture, 11 cases(15%, 2nd most common) of colon rupture, 8 cases(11%) of stomach rupture, 7 cases(9%) of duodenal rupture, etc. 5) Out of the 50 cases of hemoperitoneum(more than 2,000cc) due to abdominal trauma, there were 18 cases(36%, most common) of splenic rupture, 17 cases(34%, 2nd most common) of mesenteric tearing, 8 cases of liver laceration, 3 cases of pancreas rupture, etc.
임대인의 포트폴리오전략관점에서 본 임대주택시장의 전월세전환율
이성찬,임창호,이창무 한국주택학회 2003 한국주택학회 학술대회 발표논문집 Vol.2003 No.3
It is an unique feature of the Korean rental housing market that the lease system is largely dualized by 'Jeonsei'(up-front lump-sum rent deposit) and monthly rent contracts. The Conversion rate for Jeonsei-to-monthly rent(monthly rent rate) play a role to compare a different level of rent among the various contract types. The meaning of the Conversion rate which is a financial opportunity cost of the Jeonsei deposit or security deposit can be understood as the required rate of return of equity invested in housing or the market interest rate or portfolio return of both. This study adopts that the conversion rate can be a portfolio return and induce related variables such as market interest rate and expected capital appreciation. The results show that the conversion rate will be high in sub-market where expected capital appreciation is high, the market interest rate is high in terms of portfolio return model. Futhermore, the conversion rate can be affected by negotiations process between houseowner and tenants.