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최수진,김미자,권혁춘 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.3
The use of flowable composite resins as liners in class Ⅱ packable composite restoration has been suggested by some manufactures. However, the contributions of this technique are unproven. The purpose of this study was to compare the gingival microleakage in class Ⅱ packable composite restorations with or without the use of flowable composite resins as liners. Slot cavities were prepared on both proximals of 80 extracted human molars and randomly assigned to 8 groups of 20 each. The gingival margins were located at 1mm above CEJ in 80 cavities (group1-4) and 1mm below CEJ in 80 cavities (group5-8). The prepared teeth were mounted in the customized tray with adjacent teeth to simulate clinical conditions and metallic matrix band (Sectional matrix) and wooden wedges were applied. After acid etching and application of Single Bond, each group was restored with the following materials using incremental placement technique: Group 1,5 (Filtek P60), group 2, 3, 4 and group 6, 7, 8 (AeliteFlo, TetricFlow, Revolution/Filtek P60). All specimens were thermocycled 500 times between 5℃ and 55℃ with 1 mimute dwell time, immersed 2% methylene blue dye for 24 hours and then rinsed with tab water. The specimens were embedded in clear resin and sectioned longitudinally through the center of restoration with a low speed diamond saw. Dye penetration at gingival margin was viewed at 20 margnification and analyzed on a scale of 0 to 4. Kruscal-Wallis One way analysis and Mann-Whitney Rank sum test were used to analyze the results. The results of this study were as follows. 1. The leakage values seen at the enamel margin were significantly lower than those seen at the dentin margin(P<0.05). 2. On the enamel margin, packable composite resins with flowable liners showed lower leakage than those without flowable liners, but there were no significant differences among the four groups(P>0.05). 3. On the dentin margin, four groups demonstrated moderate to severe leakage, and there were no significant differences in leakage values(P>0.05).
차세대 지능형 건설물류관리 프로세스 지원을 위한 지능형 장비 간 물류정보인식 메커니즘 개발
권상혁(Kwon Sang-Hyuk),신태홍(Shin Tae-Hong),진상윤(Chin Sang-Yoon),김예상(Kim Yea-Sang),권순욱(Kwon Soon-Wook),윤수원(Yoon Su-Won) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.6
The characteristics of construction projects which are becoming higher and larger have recently required the effective management of construction material distribution as an essential part of becoming a successful project, adding up to time material distribution management and effective control. Also, application of rapidly changing ubiquitous technology to construction material distribution management, has brought upon the development of intellectual equipment and system research. Among the process of implementing these USN based intellectual equipment, when transporting numerous materials, the process of readingthe materials information and the problem of recognizing other material other than the planned can occur. Thus, the following research is based on the study of solutions of the problems that can occur when implementing USN based equipment for construction material distribution management by classifying problems and finding the best solution of material distribution reading mechanism through tests.
A phase II study of modified FOLFOX-4 for colorectal cancer patients with peritoneal carcinomatosis
( Hyuk Chan Kwon ),( Sung Hyun Kim ),( Sung Yong Oh ),( Su Ee Lee ),( Ji Hyun Lee ),( Hyo Jin Kim ) 대한내과학회 2011 대한내과학회 추계학술대회 Vol.2011 No.1
Background: Peritoneal carcinomatosis (PC) of colorectal cancer (CRC) is common and is the second most common cause of death. Clinical studies regarding chemotherapy for CRC with PC have been classically rather limited in scope. We have evaluated the efficacy of modified FOLFOX-4 (m-FOLFOX) regimen for PC of CRC origin. Methods: CRC patients with PC were treated with cycles of oxaliplatin at 85 mg/m2 on day 1, leucovorin 20 mg/m2 followed by 5-fluorouracil (5-FU) via a 400 mg/m2 bolus and a 22 h continuous infusion of 600 mg/m2 5-FU on Days 1-2 at 2-week intervals. Results: Forty patients participated in this study. Median age was 55 years. Thirty two patients (80.0%) received previous operation, and 60.0% of PC occurred synchronously, Thirty-five patients were assessable and exhibited measurable lesions. Two patients (5.7%) demonstrated complete response and six patients (17.1%) evidenced partial responses. The median overall survival time was 21.5 months (95% CI: 17.2-25.7 months).There was no treatment related death. Patients with low CEA level (37.2 vs. 15.6 months, p=0.001), or who received operation (22.5 vs. 6.8 months, p=0.040) showed better survival. Conclusion: The m-FOLFOX-4 regimen was determined to be effective for CRC patients with PC.
Kwon, Su Yong,Kim, Yong-Gyoo,Lee, Sang Hyun,Moon, Jun Hyuk Springer-Verlag 2011 METROLOGIA -BERLIN- Vol.48 No.5
<P>One of the standard methods used to measure the size of nanoparticles in aqueous solutions <I>in situ</I> is dynamic light scattering (DLS). The principle of this technique used to measure the real size of nanoparticles in a solution is the use of a procedure that extrapolates the apparent diffusion coefficients at different scattering angles and the sample concentration to infinite conditions. The uncertainty in the measurement is related to the extrapolating procedure used, and we have evaluated this for nanoparticles with diameters in the range 20 nm to 100 nm using the methods described in the ISO <I>Guide to the Expression of Uncertainty in Measurement</I>. The size of nanoparticles measured using DLS was compared with that obtained using a microscopic method, a cryo-transmission electron microscope, to check the reliability of the results obtained from the DLS measurements, which showed good agreement within the uncertainty levels evaluated.</P>
Kwon, Soonchul,Kwon, Hyuk Jae,Choi, Ji Il,Kim, Ki Chul,Seo, Jeong Gil,Park, Jung Eun,You, Su Jin,Park, Eun Duck,Jang, Seung Soon,Lee, Hyun Chul American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.37
<P>Since adsorption performances are dominantly determined by adsorbate adsorbent interactions, accurate theoretical prediction of the thermodynamic characteristics of gas adsorption is critical for designing new sorbent materials as well as understanding the sic), adsorption mechanisms. Here, through our molecular modeling approach using a newly developed quantum-mechanics-based force field, it is demonstrated that the CO2 adsorption selectivity of SBA-15 can be enhanced by incorporating crystalline potassium chloride particles. It is noted that the induced intensive electrostatic fields around potassium chloride clusters create gas-trapping sites with high selectivity for CO2 adsorption. The newly developed force field can provide a reliable theoretical tool for accurately evaluating the gas adsorption on given adsorbents, which can be utilized to identify good gas adsorbents.</P>
( Su-hyuk Yim ),( In Sun Kwon ),( Dongkyun Hong ),( Kyung Eun Jung ),( Young Lee ),( Young-joon Seo ),( Chong Won Choi ) 대한피부과학회 2021 Annals of Dermatology Vol.33 No.2
Background: Longitudinal melanonychia (LM) is a common clinical finding. Most cases of LM are benign, and a wait-and-see approach is preferred in the management of this condition. Nevertheless, it is important for clinicians to distinguish subungual melanoma (SUM) from other benign LMs. Objective: To evaluate the demographic and clinicopatho-logic characteristics of LM in the Korean population and to identify the predictor of SUM against other benign conditions. Methods: This was a single-center retrospective cohort study including patients who underwent nail biopsy for LM from January 2000 to May 2019. To identify the predictor of SUM, receiver operating characteristic (ROC) analyses was performed. Results: A total of 68 cases of biopsy-proven LM were included in the analysis. Among the 68 cases, 8 were SUM. In univariable analysis, patients diagnosed with SUM were older (p=0.035) and had a longer disease duration (p=0.004). They also showed multicolor pigmentation of LM (p=0.022), a larger width of LM (p<0.001), and associated nail plate dystrophy (p=0.010) than patients diagnosed with benign conditions. In multivariable logistic regression, width of LM showed statistical significance (odds ratio, 1.083; 95% confidence interval, 1.018∼1.153). ROC analysis suggested that an LM width >28% of the whole nail was the predictor of SUM (area under the curve=0.883; p<0.001). Conclusion: SUM has distinct demographic and clinical features. The width of LM can predict SUM against other benign LMs. (Ann Dermatol 33(2) 147∼153, 2021)