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Phase formation kinetics in strontium bismuth tantalate
Sung, Yun-Mo,Kwack, Woo-Chul 대진대학교 첨단소재연구소 2000 첨단소재연구소논문집 Vol.3 No.-
Phase formation characteristics of Sr0.7Bi2.4Ta2O9 (SBT) powder, synthesized via sol-gel and pyrolysis process, was investigated by using thermal analysis. Each of the two exotherms, appearing in differential thermal analysis (DTA) scan curves, was identified as crystallization of fluorite phase and transformation of fluorite to aurivillius phase, respectively by using x-ray diffraction (XRD). By applying non-isothermal kinetic analyses to the DTA results, activation energy values for the formation of fluorite and aurivillius phases were determined as 192 and 375 kJ/mol, respectively and Avrami exponent values for each reaction were determined as 0.91 and 0.96, respectively. These activation energy and Avrami exponent values were discussed in detail to understand phase formation mechanism in SBT system.
Torque control during lingual anterior retraction without posterior appliances
Sung-Seo Mo,Seong-Hun Kim,Sang-Jin Sung,Kyu-Rhim Chung,Yun-Sic Chun,Yoon-Ah Kook,Gerald Nelson 대한치과교정학회 2013 대한치과교정학회지 Vol.43 No.1
Objective: To evaluate the factors that affect torque control during anterior retraction when utilizing the C-retractor with a palatal miniplate as an exclusive source of anchorage without posterior appliances. Methods: The C-retractor was modeled using a 3-dimensional beam element (0.9-mm-diameter stainless-steel wire) attached to mesh bonding pads. Various vertical heights and 2 attachment positions for the lingual anterior retraction hooks (LARHs) were evaluated. A force of 200 g was applied from each side hook of the miniplate to the splinted segment of 6 or 8 anterior teeth. Results: During anterior retraction, an increase in the LARH vertical height increased the amount of lingual root torque and intrusion of the incisors. In particular, with increasing vertical height, the tooth displacement pattern changed from controlled tipping to bodily displacement and then to lingual root displacement. The effects were enhanced when the LARH was located between the central and lateral incisors, as compared to when the LARH was located between the lateral incisors and canines. Conclusions: Three-dimensional lingual anterior retraction of the 6 or 8 anterior teeth can be accomplished using the palatal miniplate as the only anchorage source. Using LARHs at different heights or positions affects the quality of torque and intrusion.
S-15 The Association of Gallstone & Cholecystectomy with Metabolic changes or Intestinal bacteria
( Sang Hoon Lee ),( Dae Bum Kim ),( Chang Nyol Paik ),( Yeon Ji Kim ),( Keun Joong Yun ),( Ji Min Lee ),( Woo Chul Chung ),( Kang-moon Lee ),( Jin Mo Yang ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1
Objectives: Gallbladder (GB) diseases including the status of gallstone or cholecystectomy could be associated with metabolic diseases or intestinal bacteria. However, their role has not been clarified. We investigate the relationship of GB diseases with fatty liver, hypertension, diabetes, metabolic syndrome, and small intestinal bacterial overgrowth (SIBO). Methods: We prospectively evaluated the consecutive outpatients with GB diseases attending a gastrointestinal clinic, who underwent demographic investigation, blood test for metabolic diseases, abdominal ultrasonography, glucose breath test (GBT). The 26 Controls without any abdominal symptoms were also enrolled. Results: 178 patients with GB diseases (131 GB stone, 47 cholecystectomy) were finally enrolled. The mean age of the patients were 55.4 years (range: 19-80) and 37.6% were male. The prevalence of fatty liver (46.1%), dyslipidemia (41.0%), hypertension (33.7%), metabolic syndrome (29.8%), SIBO (35.4%) and serum alanine aminotransferase (ALT) were significantly higher or higher tendency in patients with GB disease than in controls. Multivariate logistic regression analysis showed that dyslipidemia (OR=3.12, 95% confidence interval (CI): 1.02-9.73), hypertension (OR=4.62, 95% confidence interval (CI): 1.24-17.26), fatty liver (OR=3.42, 95% confidence interval (CI): 1.07-10.90) and metabolic syndrome (OR=10.39, 95% confidence interval (CI): 1.28-84.06) were independent factors associated with GB diseases. In subgroups with GB stones, dyslipidemia, hypertension, metabolic syndrome, and SIBO were independent factors. Whereas in subgroups with cholecystectomy, metabolic syndrome, fatty liver, and severity fatty liver were independent factors. Conclusions: The metabolic status with dyslipidemia, hypertension, metabolic syndrome is common risk factors related with both GB stone and cholecystectomy. Cholecystectomy is associated with the progression of fatty liver; whether GB stone is independently related with risk of intestinal bacteria
Results of Postoperative Radiotherapy for Breast Carcinoma
Yun, Sang Mo,Kim, Jae Cheol,Park, In Kyu 慶北大學校 醫科大學 1993 慶北醫大誌 Vol.34 No.4
저자들은 1986년부터 1991년까지 경북대학교 병원에서 근치적 목적으로 수술 및 수술후 방사선치료를 받은 33명의 유방암 환자를 대상으로 생존율 및 예후 인자에 대하여 후향적 분석을 실시하였다. 33명의 환자중 13명이 Ⅱ병기에, 20명이 Ⅲ병기에 해당되었다. 수술 방법은 근치 유방절제술을 시행한 4례를 제외하고 모두 변형 근치 유방절제술이었다. 추적관찰기간은 1년에서 6년이었다. 5년 생존율 및 5년 무병 생존율은 각각 62%와 47%였다. 생존율에 유의한 영향을 끼친 인자는 전체 병기(p=0.008) 및 원발 병소의 병기(p=0.008)였고, 나이, 임파절 병기, 원발 병소의 크기, 그리고 임파절의 수 등은 유의한 영향을 끼치지 않았다. 국소제발율은 21%였으며, 영향을 끼친 인자는 원발병소의 병기와 임파절의 수였으나 통계학적 유의성은 없었다. 원격전이는 33명중 10명(30%)에서 보였고, 골 전이가 가장 않았다. 저자들의 치료성적 및 다른 저자들의 결과를 종합해 볼 때 수술후 방사선치료가 실패율이 높은 유방암 환자에서 국소치유율과 생존율을 향상시키는 역할을 하고 있음을 알 수 있었다.
( Yun Hee Kim ),( Min Kyu Choi ),( Rae Hong Jung ),( Sang Pil Yoon ),( Jun Yu ),( Hee Gu Choi ),( Soon Mo Ahn ),( Hyo Bang Moon ) 한국환경분석학회 2010 환경분석과 독성보건 Vol.13 No.1
Polycyclic aromatic hydrocarbons (PAHs) and fecal sterols were determined in the sediment from Gamak Bay in Korea, to investigate their distributions and impacts on benthic environment. Concentrations of 16 PAHs and 8 fecal sterols in Gamak Bay sediments ranged from 130 to 2,100 ng/g dry weight (mean 400 ng/g dry weight), and from 740 to 9,500 ng/g dry weight (mean 2,900 ng/g dry weight), respectively. Concentrations of coprostanol (Cop), which has been used as indicator of domestic pollution, ranged from 12 to 600 ng/g dry weight. Concentrations of PAHs and Cop in the sediment from Gamak Bay were similar to or lower than those reported for industrialized bays of Korea and other countries. No correlation between the levels of PAHs and fecal sterols was found in sediment from Gamak Bay, suggesting the differences of source and behavior for these chemicals in coastal environment. Diagnostic ratios and profiles of PAHs in Gamak Bay sediment showed a strong pyrolytic origin with a slight petrogenic contamination. The Cop/(Cop+cholestanol) and Cop/ cholesterol showed that the organic pollution in Gamak Bay was attributed to biogenic source rather than sewage pollution. Spearman correlation analyses and non-parametric multidimensional scaling (MDS) technique showed that distribution of fecal sterols was associated with benthic community structure in sediment from Gamak Bay.