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FBPE를 함유하는 PET/PEN-FBPE 공중합체의 열적 기계적 성질
공이성(Lee Sung Kong),이영실(Young Sil Lee),윤관한(Kwan Han Yoon) 한국고분자학회 2017 폴리머 Vol.41 No.5
Fluorenylidenebis(2-phenoxyethanol)(FBPE)의 농도에 따라 PET/PEN-FBPE 공중합체를 제조하였다. 이때 PEN의 농도는 8 mol%로 고정하였다. 공중합체의 Tg는 FBPE의 함량에 따라 증가하였고, FBPE의 함량이 20 mol%일 때 117℃로 45℃증가하였다. 공중합체의 열분해온도 또한 FBPE의 함량에 따라 증가하여 FBPE가 없는 PET/PEN 공중합체의 값인 369℃에서 FBPE의 함량이 20 mol%인 PET/PEN-FBPE 공중합체의 값인 423℃로 54℃의 증가가 얻어졌다. 공중합체의 열변형온도 또한 FBPE가 없는 PET/PEN 공중합체의 값인 66℃에서 FBPE의 함량 20 mol%에서 105℃로 39℃ 증가하였다. 공중합체의 충격강도는 FBPE 함량에 따라 증가하였고 FBPE가 없는 PET/PEN 공중합체의 값인 6.2 J/m에서 FBPE의 함량 20 mol%에서 10.5 J/m로 증가하였다. FBPE 함량에 따라 탄성률에서는 큰 차이를 나타내지 않았지만 인장강도의 경우는 FBPE 함량에 따라 51 MPa에서 74 MPa로 증가하였다. 공중합체의 광투과율은 FBPE 함량에 따라 90%에서 87%로 약간 감소하는 경향을 보였다. PET/PEN-FBPE copolymers containing fluorenylidene bis(2-phenoxyethanol) (FBPE) were prepared with various FBPE concentrations. The concentration of PEN in PET/PEN copolymer was fixed at 8 mol%. The glass transition temperature of copolymer was increased from 72℃ for PET/PEN copolymer to 117℃ for PET/PEN-FBPE copolymer containing 20 mol% of FBPE. The thermal decomposition temperature of copolymer measured at 5 wt% loss was increased from 369℃ for PET/PEN copolymer to 423℃ for PET/PEN-FBPE copolymer containing 20 mol% of FBPE. Also, the heat deflection temperature was increased from 66 to 105℃ with FBPE concentration. The impact strength was also increased from 6.2 to 10.5 J/m with increasing FBPE concentration. The effect of FBPE on the tensile modulus was not observed, but the tensile strength increased from 51 to 74 MPa at 20 mol% loading of FBPE. The optical transparency of copolymer was slightly decreased from 90 to 87% with increasing FBPE concentration.
유관 상피내암(DCIS)에 대한 임상적, 병리학적 분석 및 생물학적 표지자들의 발현과 예후인자들과의 관계
강성수(Sung Soo Kang),고승상(Seung Sang Ko),조백현(Back Hyun Jo),허민희(Min Hee Hur),이해경(Hae Kyung Lee),이성공(Sung Kong Lee),전이경(Yi Kyeong Chun),김의정(Yee Jeong Kim),이경상(Kyung Sang Lee),홍성란(Sung Ran Hong),이지현(Jee Hyu 대한외과학회 2003 Annals of Surgical Treatment and Research(ASRT) Vol.64 No.4
Castleman 병과 Hodgkin 병이 병발한 증례
이성규(Seong Kyu Lee),이정길(Jung Gil Lee),임창훈(Chang Hoon Yim),방수관(Soo Kwan Bang),이관우(Kwan Woo Lee),김은주(Eun Ju Kim),한인권(In Kwon Han),이성공(Seong Kong Lee),홍성란(Sung Ran Hong) 대한내과학회 1994 대한내과학회지 Vol.46 No.5
Castleman's disease, a reactive lymphoid proliferation of unknown cause and pathogenesis, was initially described by Castleman et al under the heading localized mediastinal lymph node hyperplasia resembling thymoma. This disorder has been expanded to include other sites, systemic manifestations and multicentric lesions. Castleman's disease often complicates a malignant lymphoma. In some cases, Castleman's disease and Hodgkin's disease were found to be combined. More cases, however, are needed to define this association and establish its possible prognostic value. The following is a report of a 33-year-old infertile, anemic woman who has concomitant Castleman's disease and Hodgkin's disease.
이정길(Jung Gil Lee),이성규(Seong Kyu Lee),장학철(Hak Chul Jang),민용기(Yong Ki Min),한인권(In Kwon Han),이성공(Sung Kong Lee),조정현(Jung Hyeon Jo),홍성란(Sung Ran Hong),김희숙(Hi Suk Kim) 대한내과학회 1994 대한내과학회지 Vol.46 No.6
Adrenal myelolipomas are rare, nonfunctioning, benign tumors composed of mature fat and bone-marrow elements. In the past, most cases were discovered incidentally at autopsy. Recently they are detected by ultrasonography, computed tomography, or magnetic resonance imaging scan, done for other reasons, When the preoperative diagnosis is difficult, fine-needle aspiration biopsy can be used to make the diagnosis and avoid an unnecessary operation. We report a case of adrenal myelolipoma that simulated clinically and biochemically a virilizing adrenal tumor. A 32-year-old woman was admitted to the hospital with complaints of hirsutism and amenorrhea. Endocrinologic evaluation showed mild elevation of serum testosterone, but the other adrenal hormones were normal. The computed tomography presented a 12×11×10cm-sized, well-defined, low-density suprarenal mass. The preoperative diagnosis was established by the ultrasono-guided fine needle aspiration. The tumor was surgically removed, then serum testosterone level was decreased and hirsutism was somewhat improved.
유방암에서 Nitric Oxide Synthase의 발현
이해경(Hae Kyung Lee),조백현(Back Hyun Cho),허민희(Min Hee Hur),강성수(Sung Soo Kang),이지현(Jee Hyun Lee),이성공(Sung Kong Lee),김혜선(Hye Sun Kim),김의정(Yee Jeong Kim),문병산(Byoung San Moon),김세중(Sei Joong Kim),한혜승(Hae Seung 대한외과학회 2002 Annals of Surgical Treatment and Research(ASRT) Vol.63 No.2