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백승준,김진오,백롱민,오갑성,백세민 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.5
Hemifacial microsomia is a descriptive term for the developmental anomaly affecting the tissues derived from 1st and 2nd branchial arches, expressed as asymmetric underdevelopement in facial bony skeleton. Conventional strategy of surgical correction for hemifacial microsornia consists of leveling though maxillary LeFort osteotomy and rotation, advancement and recession through bilateral sagittal split us osteotomy, which was reinforced by ancillary procedures such as mandibular augmentation with onlay bone graft, mandibular angle ostectomy, temporomandibular dibular joint (TMJ) reconstruction and malar reconstruction. But these like conventional methods for correction of hemifacial microsomia were emphasized on the correction of vertical asymmetry primarily, overlooked the asymmetry of horizontal plane, namely hypoplastic malar deformity. In general, correction of malar hypoplasia was achieved by rib or calvarial bone graft. These methods remain donor site deformity and the result can not be precisely predicted due to progressive resorption of bone. Moreover, the natural appearance of zygomatic complex could not be established by bone graft. Malar expansion by zygomatic osteotomy and spread-out technique was applied on correction for 34 case in total 65 cases of hemifacial microsomia from March 1991 to February 1996. We could get more natural appearance of malar complex and facial symmetry in the correction of hemifacial microsomia at one stage operation than conventional malar reconstruction methods.
백승준,임재호,백룡민,오갑성,백세민 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.5
The harvesting of costal cartilage for the total ear reconstruction elicits various functional and aesthetic problems such as pneumothorax, atelectasis, pain, scar and chest contour deformities. Although the costal cartilage has been the most popular autogenous tissue for the total ear reconstruction, the studies about problems of donor site after harvesting the costal cartilage were relatively rare. From March 1989 to October 1996, 153 cases of total ear reconstruction by the costal cartilage framework insertion were done in our hospital and 61 cases whose follow up were done over 6 months were analysed for donor site scar, contour deformity and rate of satisfaction. The optimal age of microtia reconstruction was considered as over the age of 8, because of the growth of the ear and the volume of costal cartilage. Through a small incision, 3 ~ 4 cm, on the contralateral chest, the 6th, 7th and 8th costal cartilage were harvested with the outer layer of perichondrium for survival of the costal cartilage framework, the inner layer of perichondrium was remained for the growth of costal cartilage. There were 4 cases of uneventful pleural perforation, and remained no problems on the patients. The state of chest donor site were analyzed on 61 patients by use of medical records, medical photos and interview with the patients. Mean length and width of chest scar were 5.2 cm and 2.3 mm 79% of patients classified as excellent or acceptable. Chest contour deformity was observed on 39% and 85% of patients were satisfied with the result of donor site.
Rong-Jun Zhang,Wei-Jie Lu,Qing-Yuan Cai,Wei-Xi Zhou,Yu-Xiang Zheng,Liang-Yao Chen,Hui Zhou,Shi-Xiong Qian,Se-Young Seo 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4
The nonlinear optical properties have been studied using the Z-scan technique for silicon nanocrystals embedded in a SiO2 matrix formed by high-temperature annealing of SiOx/SiO2 superlattices grown by thermal evaporation. A mode-locked Ti:sapphire laser system producing 140-fs-long pulses at 800 nm was used as the optical source for the Z-scan measurements. The nonlinear refractive index and the nonlinear absorption coefficient of the silicon nanocrystals were found to be 1.2 × 10−13 cm2/W and 1.5 × 10−9 cm/W, respectively, and to be strongly enhanced compared to those of bulk silicon. Such enhancement of the nonlinear optical properties is considered to be due to the quantum confinement effect of silicon nanocrystals.
( Jun Mei Ding ),( Ting Ting Yu ),( Lian Ming Liang ),( Zhen Rong Xie ),( Yun Juan Yang ),( Jun Pei Zhou ),( Bo Xu ),( Jun Jun Li ),( Zun Xi Huang ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.11
The esterase gene Est8 from the thermophilic bacterium Bacillus sp. K91 was cloned and expressed in Escherichia coli. The monomeric enzyme exhibited a theoretical molecular mass of 24.5 kDa and an optimal activity around 50°C at pH 9.0. A model of Est8 was constructed using a hypothetical YxiM precursor structure (2O14_A) from Bacillus subtilis as template. The structure showed an α/β-hydrolase fold and indicated the presence of a typical catalytic triad consisting of Ser-11, Asp-182, and His-185, which were investigated by site directed replacements coupled with kinetic characterization. Asp-182 and His-185 residues were more critical than the Ser-11 residue in the catalytic activity of Est8. A comparison of the amino acid sequence showed that Est8 could be grouped into the GDSL family and further classified as an SGNH hydrolase. Est8 is a new member of the SGNH hydrolase subfamily and may employ a different catalytic mechanism.
Highly Reliable White LEDs Using Nitride Phosphors
Rong-Jun Xie,Naoto Hirosaki,Takashi Takeda 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.4
Nitride phosphors are now attracting significant attention of material scientists and phosphor engineers, because they promise red-shifted photoluminescence spectra, small Stokes shift, high quantum efficiency and low thermal degradation. A number of interesting nitride phosphors have been developed and practiced for producing white light with LED chips. In this paper, the applications of nitride phosphors in highly reliable wLEDs will be overviewed.
Study of the Optical Properties of Bi3:15Nd0:85Ti3O12 Ferroelectric Thin Films
Rong-Jun Zhang,Yi-Ming Chen,Yu-Xiang Zheng,Peng-Hui Mao,Wei-Jie Lu,Liang-Yao Chen 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
The optical properties of Bi3:15Nd0:85Ti3O12 (BNdT) feroelectric thin films were studied. The BNdT thin lms were deposited on Pt/Ti/SiO2/Si substrates by using a sol-gel technique. The elipsometric spectra of the BNdT thin film were measured and investigated in the photon energy range of 1.5 - 4.5 eV. The elipsometric spectral data were fited by using the four-phase layer structure model and the Forouhi-Bloomer (FB) model, which was used to describe the optical dispersion relation of the sample. The optical constants of the sample were obtained by using a data analysis based on Tauc's principle and showed that the direct band gap of the BNdT sample existed at 3.89 eV.
Jun Guan,Yu Xue,Rong-yu Zang,Ji-hong Liu,Jian-qing Zhu,Ying Zheng,Bo Wang,Hua-ying Wang,Xiao-jun Chen 대한부인종양학회 2021 Journal of Gynecologic Oncology Vol.32 No.4
Background: Sentinel lymph node (SLN) mapping has been recommended as an alternative staging approach to lymphadenectomy for apparent uterine-confined endometrial cancer (EC). However, the prognostic value of SLN mapping alone instead of systematic lymphadenectomy on EC patients remains unclear. Methods: A multi-center, open label, non-inferiority randomized controlled trial has been designed to identify if SLN mapping alone is not inferior to pelvic lymphadenectomy on prognosis of patients with intermediate-high-risk EC clinically confined to uterus. Eligible patients will be 1:1 randomly assigned to accept SLN mapping or pelvic lymphadenectomy. The primary endpoint is the 2-year progression-free survival (PFS). The second points are the 5-year PFS, 5-year overall survival, surgery-related adverse events and life quality. A total of 780 patients will be enrolled from 6 hospitals in China within 3-year period and followed up for 5 years. Trial Registration: ClinicalTrials.gov Identifier: NCT04276532
Jun Wei Wu,Yu Rong Xing,Yi Bo Wen,Tian Fang Li,Quan De Feng,Xiao Ping Shang,Yun Long Li,Jin Jin Feng,Xin Xin Wang,Rong Qun Zhai,Xiang Fei He,Tao Chen,Xin Jian Liu,Jian Guo Wen 대한배뇨장애요실금학회 2016 International Neurourology Journal Vol.20 No.2
Purpose: To investigate the prevalence of spina bifida occulta (SBO) and its relationship with the presence of overactive bladder (OAB) in middle-aged and elderly people in China. Methods: A cross-sectional community-based survey was carried out at 7 communities in Zhengzhou City, China from December 15, 2013 to June 10, 2014, where residents aged over 40 years were randomly selected to participate. All of the participants underwent lumbosacral radiographic analysis and relevant laboratory tests. A questionnaire including basic information, past medical history and present illness, and the OAB symptom score was filled out by all participants. Chi-square tests and logistic regression were used for data analysis with a P-value of <0.05 denoting statistical significance. Results: A total of 1,061 subjects were qualified for the final statistical analysis (58.8±11.7 years; male, 471 [44.4%]; female, 590 [55.6%]). The overall prevalence of SBO was 15.1% (160 of 1,061): 18.3% (86 of 471) in men and 12.5% (74 of 590) in women. Among these subjects, 13.7% (145 of 1,061) had OAB: 13.2% (62 of 471) in men and 14.1% (83 of 590) in women. The results of logistic regression showed that age, SBO, history of cerebral infarction (HCI), and constipation were risk factors for OAB (P<0.05), while sex, history of childhood enuresis (HCE), body mass index (BMI), and diabetes mellitus (DM) were not (P>0.05). In men, age, SBO, and constipation were risk factors for OAB (P<0.05), while HCE, BMI, DM, HCI, and benign prostate hyperplasia were not (P>0.05). In women, age, SBO, and HCI were risk factors for OAB (P<0.05), while HCE, BMI, DM, vaginal delivery, and constipation were not (P>0.05). Conclusions: The prevalence of SBO is high and it is related to OAB in middle-aged and elderly people in China.
Jun-Rui Xu,Jun-Jia Cui,Guangyong Sun,Yan-Rong Li,Chun-Feng Li 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
The plain strain of AZ31 magnesium alloy sheet in magnetic pulse forming was investigated by numerical simulation and experimental method. Combination of uniform pressure coil and Holmberg's specimen was employed to evaluate the plain strain of AZ31 sheet. The numerical simulation for magnetic pulse plain strain of AZ31 sheet is performed by means of ANSYS FEA software. The magnetic flux density of uniform pressure coil was distributed uniformly, especially at the center of gauged area of AZ31 sheet directly in relation to the deformation behavior of AZ31 sheet. The velocity of typical point increases as increasing energy, and the more position closes to the center of sheet the higher velocity achieves. The forming height is increased with increasing discharge voltage. Compared with C=768 μF and C=1536 μF, the capacitance of 1152 μF is more effective for forming, which is confirmed by experiments. The peak velocity at the center of sheet is about 105 m/s. The major strains of magnetic pulse plane strain lie approximately in the strain ranges of 5.83-6.45%. However, the 3.22-3.82% (major strain) are the limit strains in quasi-static condition. The experimental results indicate that the major strain of AZ31 sheet improves about 75% compared with the quasi-static case.