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Incidence and 30-day mortality of peptic ulcer bleeding in Korea
Bae, SeungJin,Kim, Nayoung,Kang, Jung Mook,Kim, Dong-Sook,Kim, Kyoung-Min,Cho, Yu Kyung,Kim, Jie-Hyun,Jung, Sung Woo,Shim, Ki-Nam Lippincott Williams Wilkins, Inc. 2012 European journal of gastroenterology & hepatology Vol.24 No.6
OBJECTIVES: To estimate the rates of peptic ulcer bleeding (PUB) incidence and the association of demographic factors with 30-day mortality after PUB. METHODS: Diagnostic algorithms for PUB were derived and validated on the basis of 115 true PUB patients at one tertiary hospital in 2005, followed by estimation of age-specific PUB incidence and 30-day mortality rates, using the Korean National Health Insurance claim database. A Cox proportional hazard model was used to determine the impact of demographic factors on the 30-day mortality rate ratio (MRR) after PUB. RESULTS: The diagnostic algorithm showed 89 and 88% positive predictive value and sensitivity, respectively. On the basis of this algorithm, the rate of PUB incidence was 22.1 per 100 000 during 2006–2007 and the age-specific incidence rate increased with advanced age. This incidence rate was more than three times higher among men than women. Among 21 107 PUB patients, the overall 30-day mortality rate was 2.15%, but it ranged from 0.83% for patients younger than 60 years to 7.65% for patients older than 80 years. The adjusted 30-day mortality rate ratio for patients older than 80 was 8.13 (95% confidence interval 6.10–10.8) compared with those younger than 60 and 7.09 (95% confidence interval 2.78–4.51) for patients with a high level of comorbidity compared with a low level of comorbidity. CONCLUSION: PUB incidence was higher among men and increased with advanced age. Increased 30-day mortality was observed in association with increasing age, after adjusting for comorbidity.
평판요소 방사효율을 이용한 원통형 구조물 음향방사파워 산출에 관한 연구
한승진(Seungjin Han),강명환(Myunghwan Kang),배수룡(Sooryong Bae),정우진(Woojin Jung) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
This study investigates an efficient method to estimate the underwater radiated noise of submerged circular cylindrical structures. The underwater radiated noise is estimated from the measured velocity and the calculated radiation efficiency of the structure surface. The estimation of total acoustic radiation power are in a good agreement with the measurement results for the mid-high frequency range. However, the estimation of radiation directivity does not match well.
Kim, Seungjin,Bae, Wookeun,Kim, Moonil,Kim, Jong-Oh,Chung, Jinwook Taylor Francis ; Publications Division, Selper Ltd 2015 Environmental Technology Vol.36 No.8
<P>A two-stage biological aerated/anoxic filter (BAF) system for denitrification-nitrification was developed to increase nitrogen removal in the treatment of municipal wastewater with low carbon:nitrogen (C/N) ratio [Formula: see text]. This system exhibited a high denitrification efficiency (67%), despite the low C/N ratio, and the ratio of reduced nitrate to consumed organic compounds was greater than the theoretical value due to the minimization of the conversion of organic carbon to biomass growth, the maintenance of low levels of dissolved oxygen in recycled water, and the maximization of use of organic carbon biosorbed inside biomass in the denitrification BAF. The maximum rate of nitrogen removal was achieved at a recycle ratio of 170%, and the headloss in two BAFs was maintained after a 24-h backwash. Biological nitrogen removal in a two-stage BAF system was possible in a short hydraulic retention time (1.2???h) because the maximum reaction rates of nitrifiers and denitrifiers in each column were achieved.</P>
Deformation behavior of nanocrystalline and ultrafine-grained CoCrCuFeNi high-entropy alloys
Nam, Seungjin,Hwang, Jun Yeon,Jeon, Jonggyu,Park, Jihye,Bae, Donghyun,Kim, Moon J.,Kim, Jae-Hun,Choi, Hyunjoo Published for the Materials Research Society by th 2019 Journal of materials research Vol.34 No.5
<▼1><B>Abstract</B><P/></▼1><▼2><P>Nanocrystalline (NC) and ultrafine-grained (UFG) CoCrCuFeNi high-entropy alloy (HEA) with grain size ranging between 59 and 386 nm was produced via powder metallurgy and heat treatment. The as-sintered HEA exhibited two face-centered cubic (FCC) phases (CoCrFeNi-rich and Cu-rich phases) and a small grain size (59 nm), whereas the alloy after heat treatment at 1000 °C exhibited a CoCuFeNi-rich phase with FCC structure and relatively larger grain size (386 nm). Moreover, the yield strength decreased from 1930 to 883 MPa, and plastic strain to failure increased by 8-32%. In terms of microstructural evolution, grain boundary strengthening coupled with lattice distortion was the dominant strengthening mechanism for NC HEAs. Furthermore, the coefficient for boundary strengthening was higher in the HEAs than in the corresponding pure elemental metals with FCC structure, possibly because of significant lattice distortion. The UFG HEAs exhibited high strength and good ductility because of the activation of dislocation.</P></▼2>
접수 원통형 구조물의 표면 진동속도를 이용한 총 방사음향파워 계산
한승진(Seungjin Han),이종주(Jongju Lee),강명환(Myunghwan Kang),배수룡(Sooryong Bae),정우진(Woojin Jung) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Most naval underwater weapon system can be simplified to a circular cylindrical structure which has vibrating machineries inside. In order to predict efficiently the total acoustic radiation power of cylindrical structure, surface velocity is measured and radiation efficiency of surface element is calculated. Then, they are substituted to the surface pressure in the simplified Helmholtz integral equation which assumes acoustic far-field and plane-wave approximation at the surface. Surface velocity and total acoustic radiation power for a submerged cylinder are measured in water-tank. In this example, it is found that total acoustic power output obtained from the prediction is in good agreement with that of measurement in mid-high frequency range.
Analysis of Statistical Methods Currently used in Toxicology Journals
Na, Jihye,Yang, Hyeri,Bae, SeungJin,Lim, Kyung-Min Korean Society of ToxicologyKorea Environmental Mu 2014 Toxicological Research Vol.30 No.3
Statistical methods are frequently used in toxicology, yet it is not clear whether the methods employed by the studies are used consistently and conducted based on sound statistical grounds. The purpose of this paper is to describe statistical methods used in top toxicology journals. More specifically, we sampled 30 papers published in 2014 from Toxicology and Applied Pharmacology, Archives of Toxicology, and Toxicological Science and described methodologies used to provide descriptive and inferential statistics. One hundred thirteen endpoints were observed in those 30 papers, and most studies had sample size less than 10, with the median and the mode being 6 and 3 & 6, respectively. Mean (105/113, 93%) was dominantly used to measure central tendency, and standard error of the mean (64/113, 57%) and standard deviation (39/113, 34%) were used to measure dispersion, while few studies provide justifications regarding why the methods being selected. Inferential statistics were frequently conducted (93/113, 82%), with one-way ANOVA being most popular (52/93, 56%), yet few studies conducted either normality or equal variance test. These results suggest that more consistent and appropriate use of statistical method is necessary which may enhance the role of toxicology in public health.
Analysis of Statistical Methods Currently used in Toxicology Journals
Jihye Na,Hyeri Yang,SeungJin Bae,Kyung-Min Lim 한국독성학회 2014 Toxicological Research Vol.30 No.3
Statistical methods are frequently used in toxicology, yet it is not clear whether the methods employed by the studies are used consistently and conducted based on sound statistical grounds. The purpose of this paper is to describe statistical methods used in top toxicology journals. More specifically, we sampled 30 papers published in 2014 from Toxicology and Applied Pharmacology, Archives of Toxicology, and Toxicological Science and described methodologies used to provide descriptive and inferential statistics. One hundred thirteen endpoints were observed in those 30 papers, and most studies had sample size less than 10, with the median and the mode being 6 and 3 & 6, respectively. Mean (105/113, 93%) was dominantly used to measure central tendency, and standard error of the mean (64/113, 57%) and standard deviation (39/113, 34%) were used to measure dispersion, while few studies provide justifications regarding why the methods being selected. Inferential statistics were frequently conducted (93/113, 82%), with one-way ANOVA being most popular (52/93, 56%), yet few studies conducted either normality or equal variance test. These results suggest that more consistent and appropriate use of statistical method is necessary which may enhance the role of toxicology in public health.