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정연걸(Cheong Yeon-Geol),이정윤(Lee Jung-Yoon),이종구(Yi Chong-Ku) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.8
This paper presents the results of an experimental study on the bond strength of glass fiber reinforced polymer (GFRP) bars under repeated load. The experimental program consisted of 36 concrete cube specimens subjected to four different loading patterns. The test results showed that the bond failure of steel and GFRP-HW bars to concrete occurred mainly at the interface 1 (interface between the exterior resin layer and the concrete), but GFRP-SC bar to concrete bond failed mainly at the interface 2(interface between the resin layer and bar fiber). In addition, the cyclic load reduced the bond strength of GFRP rebars under monotonic load.
So-Yeon Jo,Yong Hwangbo,Sang-Hee Lee,Hee-Tae Cheong,Dong-Ku Kim,Choon-Keun Park 한국동물생명공학회(구 한국동물번식학회) 2021 Journal of Animal Reproduction and Biotechnology Vol.36 No.4
The immunological sperm separation method is economical compared to the existing sorting method, and it is promising for the development of new technologies by reducing sperm damage. Wholemom (WM) is a sex-regulating protein that comprises on immunoglobulin G coupled with magnetic nanoparticles (MNPs) that responds to surface proteins derived from the Y chromosome in cattle. Y sperms are restricted in motility as the WM aggregates them, and the magnet could separate the non-aggregated cells. This study was conducted to investigate the effect of WM treatment on the characteristics of bull sperm. After treating sperm with WM and incubation for 6 h, the motility parameters including total motility, progressive motility, velocity average path, velocity straight line, amplitude of lateral head displacement, and linearity were significantly higher in the WM treatment group than in the control group (p < 0.05). Sperm viability and acrosome reaction rates were similar in both groups during each incubation period (p > 0.05). In conclusion, the immunological sperm sexing procedure using a monoclonal antibody conjugated with MNPs did not affect the characteristics of bull sperm. This study suggests that compared to other techniques, the immunological method for sperm sexing could classify sperm quickly and efficiently without the use of expensive equipment.
Kim, Kyoung-Yeon,Lee, Seung-Ku,Kim, Min-Ho,Cheong, Jae-Youn,Cho, Sung-Won,Yang, Kap-Seok,Kwack, Kyu-Bum Korea Genome Organization 2008 Genomics & informatics Vol.6 No.4
Erythropoietin-producing human hepatocellular carcinoma receptor B1 (EPHB1) is a member of the Eph family of receptor tyrosine kinases that mediate vascular system development. Eph receptor overexpression has been observed in various cancers and is related to the malignant transformation, metastasis, and differentiation of cancers, including hepatocellular carcinoma (HCC). Eph receptors regulate cell migration and attachment to the extracellular matrix by modulating integrin activity. EphrinB1, the ligand of EPHB1, has been shown to regulate HCC carcinogenesis. Here, we sought to determine whether EPHB1 polymorphisms are associated with hepatitis B virus (HBV)-infected liver diseases, including chronic liver disease (CLD) and HCC. We genotyped 26 EPHB1 single nucleotide polymorphisms (SNPs) in 399 Korean CLD, HCC, and LD (CLD+HCC) cases and seroconverted controls (HBV clearance, CLE) using the GoldenGate assay. Two SNPs (rs6793828 and rs11717042) and 1 haplotype that were composed of these SNPs were associated with an increased risk for CLD, HCC, and LD (CLD+HCC) compared with CLE. Haplotypes that could be associated with HBV-infected liver diseases by affecting downstream signaling were located in the Eph tyrosine kinase domain of EPHB1. Therefore, we suggest that EPHB1 SNPs, haplotypes, and diplotypes may be genetic markers for the progression of HBV-associated acute hepatitis to CLD and HCC.
김응호,김연구,박진호,유재형,최청송,우문식 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.1
AUC(ammonium uranylcarbonate) 분말의 배소·환원에 대한 연구를 수소분위기에서 TG-DTA를 사용하여 수행하였다. AUC 분말의 열분해 과정 중 다양한 상 변화 특성을 XRD로 확인하였다. AUC분말의 열분해 반응 메카니즘은 (NH₄)₄[UO₂(CO₃)₃]→UO₃+3CO₂+4NH₃+2H₂O 3UO₃+H₂→U₃O_8+H₂O U₃O_8+H₂→3UO₃+H₂O 와 같은 3단계로 나타났다. AUC 분말의 배소·환원속도는 비등은 열중량법으로 구하였으며, 데이터해석은 Osawa방법과 Zsako 방법으로 구하였는데 다음과 같다. (도표) Calcination and reduction of AUC(ammonium uranylcarbonate) have been carried out by using TG-DTA in H₂ atmosphere. Phases of various intermediates obtained during thermal analysis of AUC were confirmed by XRD. As results, AUC was calcined and reduced by three steps as follows ; (NH₄)₄[UO₂(CO₃)₃]→UO₃+3CO₂+4NH₃+2H₂O 3UO₃+H₂→U₃O_8+H₂O U₃O_8+H₂→3UO₃+H₂O The calcination and reduction kinetics of AUC have been also determined by non-isothermal method and the analysis of kinetic data was made by Osawa and Zsako methods. The results were as follows ; (도표)
A Photo - induced Dissolution of UO2 Sintered Pellets in a Simulated Solution
Kim, Eung Ho,Choung, Won Mung,Kim, Yeon Ku,Park, Jin Ho,Yoo, Jae Hyung,Choi, Cheong Song 한국화학공학회 2000 Korean Journal of Chemical Engineering Vol.17 No.2
The objective of this study is to improve the established dissolution technique of UO₂ target by using a photochemical reaction. Photo-dissolution tests of UO₂ sintered powder and pellets were carried out in a simulated nitric acid solution at about 50℃ under UV irradiation. The simulated solution consists of 2 M nitric acid containing elements such as Cs, Sr, Zr, Ru, Mo and Nd. The light source is a Hg-lamp emitting 254 nm wavelength. As results, in the dark reaction, UO₂ sintered pellets were hardly dissolved, whereas UO₂ was rapidly dissolved after 7 hours of dissolution time in the UV irradiation. The very low dissolution rate in the dark reaction was due to surface characteristics of sintered pellets: UO₂ sintered pellet is very dense and has extremely low specific surface area. However, the dissolution rate of UO₂ sintered pellet was considerably increased in the simulated solution under UV irradiation. This was attributed to the fact that ruthenium and molybdenum ions in the simulated solution could accelerate the dissolution of UO₂ under UV irradiation. Additionally, when the pulverized sintered UO₂ powder was used, the dissolution rate of UO₂ increased more rapidly than that of UO₂ sintered pellet.
우종태 ( Jong Tae Woo ),정연희 ( Yeon Hee Cheong ),김민경 ( Min Kyoung Kim ),구경녀 ( Kyung Nyer Ku ) 한국가축위생학회 2010 韓國家畜衛生學會誌 Vol.33 No.1
To reduce an economic loss by swine disease, this study was designed to provide helpful data which are particularly useful for each individual farm. From february to December 2009, a total of 18,173 slaughter pigs (612 herds) were randomly sampled, which were produced just in southern region of Gyeonggi-do. We examined all of them for the slaughter lesions of 8 kind diseases such as swine enzootic pneumonia (SEP), pleuritis (PL), pleuropneumonia (PP), white milk spot in liver (WMS), papular dermitis (PD), pericarditis (PC), ileitis (IL) and peritonitis (PT). Twenty four percentages (4431/18173 pigs) of the examined pigs had no lesions about 8 kind diseases. Among the pigs with lesions, the numbers of the pigs with just one lesion were 7,637(42%), followed by 4,551(25%) pigs with 2 lesions. Average prevalence of pigs were 56.5% (10288/18173 pigs) in SEP, followed by 34% in PL, 12.4% in PP, 10.1% in WMS, 6.1% in PD, 4.7% in PC, 0.1% in IL and PT, respectively. Each prevalence of SEP, PL, PP and PD was higher in spring than in winter, respectively (P?0.01). Among the pigs (n=6,105) with 2 or more than 2 kinds of lesions the top (55.5%) was the pigs with SEP and PL, and the second was 1,179 (19.3%). Swine enzootic pneumonia was considered as one of the more likely risk factors for initiation or/and acceleration of other diseases such as PL, PP, WMS and PD. The lesion of SEP was relatively severe since the pigs with late stage were more (7,277 pigs) than those with early stage.