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진효승,장진해,김정철 한국고분자학회 2008 Macromolecular Research Vol.16 No.6
A series of colorless polyimide (PI) nanocomposite films were synthesized from 2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl (TFDB) with various organoclay contents by solution intercalation polymerization to poly(amic acid)s, followed by thermal imidization. The variation with the organoclay content of the thermomechanical properties, morphology, and optical transparency of the hybrids was examined at organoclay loadings ranging from 0 to 1.0 wt%. The hybrid films showed high optical transparency and almost no color, with cut-off wavelengths ranging from 352 and 356 nm and very low b* values of 1.19-1.77. The hybrid PI films showed good thermal properties with a glass transition temperature of 280-287 ℃. Most films did not show any significant thermal decomposition below 490 ℃. The addition of only a small amount of organoclay was sufficient to improve the tensile properties of the PI films with maximum enhancement being observed at 0.25 wt% organoclay. Moreover, these PI hybrids also had low coefficients of thermal expansion (CTE).
진효승,최성용,고재진,손호진,이효원,이상열,김정규 대한이비인후과학회 2015 대한이비인후과학회지 두경부외과학 Vol.58 No.12
Background and Objectives The choice of optimal treatment methods among various gland preserving procedures including transoral surgery, sialendoscopy and extracorporeal lithotripsy for submandibular stones is mainly determined by the size of the stone. We tried to assess the accuracy of ultrasonography (USG) and computerized tomography (CT) for the preoperative estimation of submandibular gland stone size. Subjects and Method We retrospectively reviewed the medical records of 251 patients who were treated for submandibular stones from January 2008 to December 2014. Eighty patients who checked both preoperative USG and CT were included. Preoperative USG and CT measurements of the submandibular stones were compared to postoperative measurements of removed stones. Effects of stone location and presence of acute infection on preoperative measurements were also assessed. Results The mean submandibular gland stone size was 6.60±3.8 mm by USG, 7.23±4.0 mm by neck CT and 7.89±4.7 mm by the postoperative measurement. USG and CT showed good correlation with the postoperative measurement (correlation coefficient 0.912 and 0.940, respectively). The location of stone and presence of combined infection showed no significant impact on the accuracy of USG and CT measurement. Conclusion USG and neck CT showed high accuracy for predicting submandibular gland stone size. However, it should be taken into consideration that the stone size could be greater than that shown by preoperative measurement.
산전에 발견된 거대 제4형 아가미틈새낭에서의 분만 중 자궁 외 치료 시술 1예
박훈,진효승,강승현,박준식 대한이비인후과학회 2015 대한이비인후과학회지 두경부외과학 Vol.58 No.11
Large neck masses in the fetus can result in neonatal hypoxia with airway obstruction during a delivery. The ex-utero intrapartum treatment (EXIT) is a procedure that would be helpful in safely securing a fetal airway when the maternal-fetal circulation is being obstructed. Branchial cleft cyst (BCC) is a relatively common congenital malformation in the neck, however, the fourth BCC is very rare. Herein, we present a case of a giant fourth BCC, which was prenatally detected on ultrasound and safely surgically treated to secure an airway with EXIT procedure during the delivery.
고재진,강승현,진효승,김정규 대한이비인후과학회 부산,울산,경남 지부회 2015 임상이비인후과 Vol.26 No.1
Vascular leiomyoma is an uncommon benign tumor that originates from the smooth muscle in the blood vessel walls. Vascular leiomyoma can occur in the head and neck region, but very rarely involves the hard palate. Vascular leiomyoma usually presents as small painless mass, and the diagnosis is usually confirmed after histopathologic study with immunohistochemical stain. The treatment of choice is complete surgical excision. Recently, we experienced a case of vascular leiomyoma on the hard palate and we report this case with review of literature.