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( William Sievert ),( Huy Trinh ),( Giampiero Carosi ),( Ulus Akarca ),( Adrian Gadano ),( Francois Habersetzer ),( David Wong ),( Meghan Lovegren ),( Hui Zhang ),( Cyril Llamoso ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.1
Background: The aim of this study was to elucidate the antiviral efficacy and safety of telbivudine in Korean treatment-naive chronic hepatitis B (CHB) patients. Methods: A total of 143 treatment-naive patients who had been treated with telbivudine for at least 6 months were consecutively enrolled. We determined the cumulative rates of virologic response (<12 IU/ml by PCR assay), serologic response, biochemical response and monitored any side effects. Results: The median age and follow-up duration were 50.7 years and 16.4 (range 6-24 months) months, respectively. Sixty seven patients (46.9%) were positive for HBeAg and the median serum HBV DNA level was 7.23 (range 4.31-8.26) log IU/ml. In HBeAg positive group, the cumulative probabilities of HBV DNA undetectability were 14.9% , 24.6%, 34.4% and 26.3% at 6, 12, 18 and 24 months, respectively. Partial virologic response at 6 months occurred in 82.1% of patients and inadequate virologic response at 6 months in 3.0%. During the follow-up period, 8 patients achieved HBeAg loss and 3 patients achieved HBeAg seroconversion. Meanwhile, in HBeAg-negative group, the cumulative rates of virologic response were 64.5%, 86.4%, 82.1% and 81.3%, respectively and the cumulative rates of biochemical response were 89.5%, 98.3%, 100% and 100%, respectively. Among the all patients, there were 42 cases of virologic breakthrough and 21 cases of genotypic resistance and virologic breakthrough. There were 46 (32.2%) cases of CK elevation and 2 (1.4%) cases of myopathy. However, there was no clinically significant safety issue. Conclusions: In Korean treatment-naive HBeAg-negative CHB patients, telbivudine therapy induced favorable virologic, serologic and biochemical responses.
CONSTRUCTION OF CORE LOSS MEASURING SYSTEM FOR ARBITRARY WAVEFORM OF MAGNETIC INDUCTION
D. Son,J. D. Sievert,Y. Cho 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
For the core loss measurement under arbitrary waveform of magnetic induction, we have constructed a single sheet core loss measuring system which consists of yoke apparatus for single sheet of 10 ㎝ x 10 ㎝, arbitrary waveform synthesizer, B-feedback system, and two channel transient recorder. Using the constructed measuring system, we can measure core loss including higher harmonics up to 2 ㎑. Core loss of non-oreinted electrical steel was increased exponentially when higher harmonic frequency was increased or amplitude of harmonic induction was increased.