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Sang-Wook Sohn,Young-Bin Lim,Jae-Jun Yun,Hun Choi,Hyeon-Deok Bae IEEE 2012 IEEE transactions on instrumentation and measureme Vol.61 No.1
<P>We present a method that combines a filter bank (FB) system with adaptive filtering to estimate parameters describing the harmonics and the interharmonics present in power signals. The proposed method decomposes the input power signal using an FB system that is a modular binary tree structure with the fundamental FBs arranged successively in each stage. The fundamental FB is designed to separate the odd and even harmonics to reduce spectral leakage. An adaptive filter is used to improve the accuracy of parameter estimation for each decomposed harmonic. Parameters describing the interharmonic components are estimated from the error signal of the adaptive filter, which is self-tuning. The estimation of the amplitude and frequency of each of the harmonic and interharmonic components is done recursively. Computer simulations were performed on synthesized signals to assess the performance of the method.</P>
( Sung Eun Kim ),( Young Pil Yun ),( Dong Hun Suh ),( Young Ran Kim ),( Kyeong Soon Park ),( Yong Dae Kwon ),( Joon Ho Suh ),( Jun Young Chung ),( Deok Won Lee ) 한국조직공학·재생의학회 2012 조직공학과 재생의학 Vol.9 No.4
Titanium (Ti) has been widely used in the dental field owing to its good biocompatibility, superior mechanical properties, and excellent corrosion resistance. However, Ti lacks the osteoconductivity and osteoinductivity required to promote mineralization. In the present study, the authors investigated whether apatite-coated Ti and rhBMP-2 treated apatite-coated Ti promote more mineralization than pristine Ti. Characterizations of pristine Ti, apatite-coated Ti, or rhBMP-2/apatite-coated Ti were analyzed using scanning electron microscopy (SEM), energydispersive spectroscopy (EDS), and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). In addition, the release profile of rhBMP-2 from rhBMP-2/apatite-coated Ti was monitored for 28 days, and the biocompatibility of pristine Ti, apatite-coated Ti, and rhBMP-2/apatite-coated Ti was evaluated by measuring cell proliferation, alkaline phosphatase (ALP) activity, calcium deposition, and real-time PCR using MG-63 cells. SEM, EDS, and ATR-FTIR showed that the apatite on apatite-coated Ti surfaces was similar to that of natural bone. Furthermore, rhBMP-2 appeared to be released steadily over 28 days from rhBMP-2/apatite-coated Ti, and MG-63 cells grown on rhBMP-2/apatite-coated Ti showed significantly higher proliferation activity, ALP activity, and calcium deposition compared to MG-63 cells grown on pristine Ti or apatite-coated Ti. Furthermore, osteocalcin and osteopontin gene expression in MG-63 cells grown on rhBMP-2/apatite-coated Ti was significantly greater than that in MG-63 cells grown on pristine Ti or apatite-coated Ti by real-time PCR. Taken together, rhBMP-2/apatite-coated Ti substrate has enhanced osteoblast function and mineralization. Thus, rhBMP-2/apatite-coated Ti may be a more effective substrate than pristine Ti used in the dental field.
Yun Ho Kim,Han Kyul Park,Na Rae Choi,Seong Won Kim,Gyoo Cheon Kim,Dae Seok Hwang,Yong Deok Kim,Sang Hun Shin,Uk Kyu Kim 대한구강악안면외과학회 2017 대한구강악안면외과학회지 Vol.43 No.1
Objectives: Bisphosphonate is the primary cause of bisphosphonate-related osteonecrosis of the jaw (BRONJ). Bisphosphonates are eliminated from the human body by the kidneys. It is anticipated that bisphosphonate levels in the body will increase if the kidney is in a weak state or if there is systemic disease that affects kidney function. The aim of this study was to analyze the relevance of renal function in the severity of BRONJ. Materials and Methods: Ninety-three patients diagnosed with BRONJ in Pusan National University Dental Hospital from January 2012 to December 2014 were included in this study. All patients underwent a clinical exam, radiographs, and serologic lab test, including urine analysis. The patient’s medical history was also taken, including the type of bisphosphonate drug, the duration of administration and drug holiday, route of administration, and other systemic diseases. In accordance with the guidelines of the 2009 position paper of American Association of Oral and Maxillofacial Surgeons, the BRONJ stage was divided into 4 groups, from stage 0 to 3, according to the severity of disease. IBM SPSS Statistics version 21.0 (IBM Co., USA) was used to perform regression analysis with a 0.05% significance level. Results: BRONJ stage and renal factor (estimated glomerular filtration rate) showed a moderate statistically significant correlation. In the group with higher BRONJ stage, the creatinine level was higher, but the increase was not statistically significant. Other factors showed no significant correlation with BRONJ stage. There was a high statistically significant correlation between BRONJ stage and ‘responder group’ and ‘non-responder group,’ but there was no significant difference with the ‘worsened group.’ In addition, the age of the patients was a relative factor with BRONJ stage. Conclusion: With older age and lower renal function, BRONJ is more severe, and there may be a decrease in patient response to treatment.