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Deviation based fault detection method for shackles under variable loading
Lee, Sunghyun,Jeon, Insu,Baek, Dong-Cheon Springer-Verlag 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.2
<P>Shackles used in lifting work are mainly subjected to fatigue loading during operation. The failure of the shackles can lead to catastrophic accidents and economic loss because they serve as a connection between loads and lifting equipment. Thus, it is necessary to detect the faults of shackles in advance. In this study, weak points of a shackle were identified through the calculated stress distribution and were verified through fatigue tests. The representative features were extracted based on RMS and peak-to-peak values of dual strain data. Thresholds for fault detection were defined using the features and the weight functions considering the inverse proportion between strain values and lifetime of shackles. The performance of detectors was evaluated by comparing with cycles between the detected fault and the incipient crack. The selected detector without using complex formulas can carry out the fault detection of shackles effectively.</P>
Sunghyun Kim,Jang-Eun Cho,Hyunjung Kim,Dongsup Lee,Bo-young Jeon,Hyejon Lee,Sang-Nae Cho,Young Keun Kim,Hyeyoung Lee 대한의생명과학회 2013 Biomedical Science Letters Vol.19 No.2
The tuberculin skin test (TST) and interferon gamma (IFN-γ) release assay (IGRA) have been widely used for diagnosis of latent tuberculosis infection (LTBI). In order to overcome limitations of current LTBI diagnostic methods, the development of a novel molecular assay which is able to measure the IFN-γ messenger RNA (mRNA) expression level after stimulation with Mycobacterium tuberculosis (MTB) specific antigen was recently developed. The ability of a molecular assay to detect MTB infection was similar to commercial IGRA however, the optimal incubation time for stimulating IFN-γ was not yet established. Therefore, in this study the direct comparisons of MTB Ag stimulation times (4 and 24 hrs) were performed for diagnosis of MTB infection. Data showed that the coincident rate between QFT-GIT IFN-γ ELISA and IFN-γ RT-PCR (4 hrs) was 88.35% and that of QFT-GIT and IFN-γ RT-PCR (24 hrs) was 70.85%. Based on a receiver operating characteristic (ROC) curve, the 4 hrs-MTB specific Ag stimulation time for IFN-γ RT-PCR had the significant P value, 95% CI value, and AUC (P < 0.0001, 95% CI=0.82 to 1.02, and AUC=0.9214) in comparison with 24 hrs-MTB specific Ag stimulation time (P = 0.009, 95% CI=0.06 to 0.94, and AUC=0.7711). These results show that 4-hr was the most optimal MTB Ag stimulation time for performing IFN-γ RT-PCR. Although semi-quantitative RT-PCR had a few analytical limitations, it might be useful as an alternative molecular diagnostic method for detecting MTB infection.
Sunghyun Hwang,이준신,Byong-Deog Choi,Ho-Kyoon Chung,Hyungjun Park,JeoungIn Lee,Ki-Young Lee,Kyung-soo Jang,S. K. Dhungel,Sungwook Jung 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.3
In this paper, we report our investigation on the effect of the presence of a high concentration of nitrogen in a silicon-oxide layer deposited by using plasma-assisted nitrous-oxide oxidation. The results of the ellipsometric measurement, the capacitance-voltage characterization studies, and the processing conditions are presented. P-type silicon wafers with 10 20 ohm·cm resistivities, 4-inch diameter; and (100) orientations were used for the fabrication of metal-insulator-semiconductor (MIS) capacitors. The silicon-oxynitride films deposited using by an inductively-coupled-plasma chemical-vapor deposition (ICPCVD) method under three different process conditions. In the first case, the RF power and the substrate temperature were kept constant while the deposition time was varied from 1 to 30 minutes. In the second case, the substrate temperature and the deposition time were kept constant while the RF power was varied from 50 to 450 W. In the thirds experiment, the RF power and deposition time were fixed while the substrate temperature was varied from 150 to 550 C. In all above processes, the nitrous-oxide flow and the working pressure were kept constant. The results of the present study indicate the suitability of the deposited films for applications in ultra very thin film transistors (UVTFT) and NVM (nonvolatile memory) devices.`t홲`t
Human Papillomavirus Prevalence and Genotype Distribution in Normal and ASCUS Specimens
Sunghyun Kim,In-soo Lee,Dongsup Lee 대한의생명과학회 2015 Biomedical Science Letters Vol.21 No.1
High-risk (HR) human papillomavirus (HPV) genotypes are strongly associated with cervical cancer, whereas other HPV genotypes are not. To identify the various HPV genotypes in clinical samples, we conducted HPV genotyping using a DNA chip test and reverse blot hybridization assay (REBA) in normal cytology samples and atypical squamous cells of undetermined significance (ASCUS) cytology samples. We also investigated the HPV infection rate and HPV genotype prevalence in women with normal cytology and ASCUS cytology. Liquid-based cytology preparations were used for the initial screening of 205 subjects with normal cytology and ASCUS cytology. The HPV infection rate was 49.8% when using the DNA chip assay and 61.0% when using the REBA test. In patients with normal cytology, the HR-HPV positive rate was 21.9% with the DNA chip assay and 43.9% with the REBA test. In contrast, 8.3% of patients with ASCUS were HR-HPV positive when using the DNA chip assay, and 13.6% were positive when tested with the REBA test. The infection rate of HR-HPV in the 40~50-year age group was significantly higher than that of the other age groups. Based on the cytological analysis of the normal and ASCUS samples, the five most prominent HPV genotypes were HPV 16, 18, 68, 33, and 58 using the DNA chip test, and they were HPV 16, 18, 53, 33, and 66 when using the REBA test. In conclusion, the findings show that the results of the REBA test are comparable to those of the DNA chip test. Most strikingly, the REBA test detected the HR-HPV genotype associated with cervical carcinoma similar to that detected with the DNA chip method. Therefore, the REBA test is a useful method to detect clinically important HR-HPV genotypes.