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임정일,강만석,김교한,김석삼 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.4
The friction and wear characteristics and wear mechanisms of dental compomers were investigated. Compomers such as Compoglass, F2000, Elan and Dyract AP were selected as specimens. Surface characteristics was examined by SEM and contents of glass fillers in specimens were determinated in order to analyze the effect of the fillers in fraction and wear characteristics. Ball on flat wear tester was used for a wear test. Friction and wear tests are carried out at room temperature. The friction coefficient of F2000 was quite high relatively, and the wear resistance of Compoglass and Dyract AP was better than that of F2000 and other specimens at the same experimental condition. The main wear mechanism is brittle fatigue of glass fillers, plastic flow and abrasive wear by crack propagation.
Automatic error correction using adaptive weighting for vessel-based deformable image registration
Jing Ren,Mark Green,Xishi Huang,Anwar Abdalbari 대한의용생체공학회 2017 Biomedical Engineering Letters (BMEL) Vol.7 No.2
In this paper, we extend our previous work ondeformable image registration to inhomogenous tissues. Inhomogenous tissues include the tissues with embeddedtumors, which is common in clinical applications. It is avery challenging task since the registration method thatworks for homogenous tissues may not work well withinhomogenous tissues. The maximum error normallyoccurs in the regions with tumors and often exceeds theacceptable error threshold. In this paper, we propose a newerror correction method with adaptive weighting to reducethe maximum registration error. Our previous fastdeformable registration method is used in the inner loop. We have also proposed a new evaluation metric averageerror of deformation field (AEDF) to evaluate the registrationaccuracy in regions between vessels and bifurcationpoints. We have validated the proposed method using liverMR images from human subjects. AEDF results show thatthe proposed method can greatly reduce the maximumregistration errors when compared with the previousmethod with no adaptive weighting. The proposed methodhas the potential to be used in clinical applications toreduce registration errors in regions with tumors.
Investigation on the Absorption Kinetics of Chlorogenic Acid in Rats by HPLC
Ren, Jing,Li, Chenrui,Jiang, Xeuhua 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.7
Chlorogenic acid (ChA), a major phenolic compound in the Flos Lonicerae, is widely used in the traditional Chinese medicine practice. The purpose of this study is to report the pharmacokinetic parameters of ChA in rats after oral administration and explore its absorption profile briefly. A two-compartment model was proposed and validated through the program to explain the apparent triphasic phenomenon of ChA in rats after intragastric administration. A rapid absorption and a relatively slow distribution followed by a slower elimination phase were observed. At the administered doses of 200, 400 and 600 mg/kg, the values of absorption half-life ($t_{1/2{Ka}}$)were 10.23, 18.66 and 28.13 min. The values of distribution half-life ($t_{1/2{\alpha}}$) were 12.35, 31.04 and 39.19 min. And the values of elimination half-life ($t_{1/2{\beta}}$) were 231.64, 337.23 and 420.81 min. The volume of distribution at the three doses were 55.26, 35.56, 32.22 L/kg, respectively. The $AUC_{0{\rightarrow}{\infty}}$ (area under the concentration-time curve) was not proportional to the administered dose. In the range of the doses examined, the absorption pharmacokinetics of ChA in rats was based on nonlinear kinetics.
Tribological Evaluation of Dental Composite Resins Containing Prepolymerized Particle Fillers
Ren, Jing-Ri,Kim, Kyo-Han,Kim, Seock-Sam The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.6
The Tribological evaluation of commercial dental composite resins containing prepolymerized particle fillers was investigated. Composite resins such as Metafil, Silux Plus, Heliomolar, and Palfique Estelite were selected as specimens. In the wear tests, a ball-on-flat wear test method was used. The friction coefficient of Metafil was quite high. The wear resistance of Silux Plus and Palfique Estelite was better than that of Metafil and Heliomolar under the same experimental conditions. The main wear mechanism of the composite resins containing prepolymerized particle fillers was abrasive wear caused by the brittle fracture of the prepolymerized particles and the debonding of the filler and the matrix.
Jing-Ren Wu,Luigi Di Sarno,Steve Hesketh,Nigel Phan 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.6
The practical application of cold-formed high strength steel is becoming increasingly popular in structural engineering due to its great effi ciency and cost eff ectiveness. However, cold-formed steel sections are usually associated with high slenderness, hence are susceptible to buckling failure. Consequently, the buckling resistance of steel struts made of cold-formed high strength steel must be determined with carefulness, particularly for complex compound sections. To this end, the present paper aims at investigating the behaviour of back-to-back channel sections made of S700 steel with a characteristic yield strength of 700 MPa. Compressive tests on such members are conducted for the purpose of validating the fi nite element models. Subsequently, a numerical parametric analysis is carried out on the buckling resistance of axially loaded cold-formed steel back-to-back channel sections, using the previously validated numerical modelling approach. In particular, the eff ects of stiff eners and number of bolts on the buckling resistance are investigated. Furthermore, the results of the parametric analysis are also compared with the codifi ed buckling resistance determined based on the eff ective width method adopted in Eurocode 3 Part 1–3, in order to evaluate the reliability of the standardised design method for buckling resistance.