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Torque control during lingual anterior retraction without posterior appliances
Mo, Sung-Seo,Kim, Seong-Hun,Sung, Sang-Jin,Chung, Kyu-Rhim,Chun, Yun-Sic,Kook, Yoon-Ah,Nelson, Gerald The Korean Association Of Orthodontists 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.
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.
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
Small interfering peptides as a novel way of transcriptional control.
Yun, Ju,Kim, Sang-Gyu,Hong, Shinyoung,Park, Chung-Mo Landes Bioscience 2008 Plant signaling & behavior Vol.3 No.9
<P>Transcription factors are key components of transcriptional regulatory networks governing virtually all aspects of plant growth and developmental processes. Their activities are regulated at various steps, including gene transcription, posttranscriptional mRNA metabolism, posttranslational modifications, nucleocytoplasmic transport, and controlled proteolytic cleavage of membrane-anchored, dormant forms. Dynamic protein dimerization also plays a critical role in this process. An exquisite regulatory scheme has recently been proposed to modulate the action of transcription factors. Small peptides possessing a protein dimerization motif but lacking the DNA-binding motif form nonfunctional heterodimers with a group of specific TFs, inhibiting their transcriptional activation activities. Extensive searches for small proteins that have a similar structural organization in the databases revealed that small peptide-mediated transcription control is not an exceptional case but would be a regulatory mechanism occurring widespread in the Arabidopsis genome.</P>
Mandibular Clinical Arch Forms in Koreans with Normal Occlusions
Yun, Young-Kuk,Kook, Yoon-Ah,Kim, Seung-Hoon,Mo, Sung-Seo,Cha, Kyung-Suk,Kim, Jong-Ghee,Tae, Ki-Chul 대한치과교정학회 2004 대한치과교정학회지 Vol.34 No.6
본 연구의 목적은 한국인 정상교합자에서 하악치열궁의 형태적 차이를 알아보고자 하였다. 한국인 102명의 정상교합자를 대상으로 하악 모형의 교합면을 복사한 후 13개의 접촉점중에서 가장 협측으로 위치한 부분을 digitize하였고 각 치아의 브라켓위치에 해당하는 점을 하악치아의 두께에 의거하여 4개의 선계측과 2개의 비율을 측정하였다. 치열궁의 형태를 square, ovoid, tapered from으로 분류하여 그 빈도를 남녀성별에 따라 비교한 결과 특이한 차이점을 보이지 않았으나 대구치간 폭경에서는 남녀성별의 차이를 보였다. 정상교합자에서 치열궁 형태분포는 ovoid, square, tapered순 이었고 tapered arch from은 10%미만이었다. 치열궁 형태의 빈도분포에 있어서 남녀간의 차이는 없었다. The purpose of this study was to clarify morphologic characteristics between mandibular clinical arch forms in Koreans with normal occlusions. The study included data from 102 Koreans. The most facial portion of 13 proximal contact areas was digitized from photocopied images of the mandibular dental arches. Clinical bracket points were calculated for each tooth based on mandibular tooth thickness data. Four linear and two proportional measurements were taken. The dental arches were classified into ovoid, square and tapered forms. The frequency distributions of the three mandibular arch form classifications were determined and compared between male and female subjects. No significant differences in arch form size were found between the sexes. However, there were a few differences in molar width. It was useful to classify mandibular clinical arch forms present in normal occlusion samples into ovoid, square and tapered categories. The frequency of the ovoid form was the highest, and that of the square form was the second highest. The tapered arch form was found in less than 10 percent of subjects. No significant differences in their frequency distributions and dimensions were shown between males and females.