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Fang, M.,Choi, S.D.,Baek, S.Y.,Jin, G.,Chang, Y.S. Pergamon Press ; Elsevier [distribution] 2012 Atmospheric environment Vol.49 No.-
Spatial distribution and seasonal variation of polychlorinated biphenyl (PCB) and polybrominated diphenyl ether (PBDE) bulk deposition were investigated at four sites at and around an iron and steel making plant in Pohang, South Korea from January 2008 to May 2009. The steel complex site showed the highest average deposition fluxes of 74.0, 2.1, and 41.6 ng m<SUP>-2</SUP> day<SUP>-1</SUP> for @?<SUB>tri-deca</SUB>PCBs (Tri-DecaCBs), @?<SUB>12</SUB>PCBs (dioxin-like PCBs), and @?<SUB>8</SUB>PBDEs (8 PBDE congeners), respectively, indicating the steel complex is an important source of PCBs and PBDEs. The PCB deposition was dominated by Tri-TetraCBs and BDE209 was the most abundant PBDE congener. No clear seasonal variation of PCB and PBDE deposition was observed except at the steel complex site. Precipitation appeared to play an important role in the deposition distribution of PCBs, especially when the lowly chlorinated homologues dominated. In addition, the contribution of DL PCBs (dioxin-like PCBs) to the total TEQ (toxicity equivalent quantity) showed a seasonal variation and should not be neglected in the vicinity of a steel complex.
Fang, R.J.,Li, T.J.,Yin, F.G.,Yin, Y.L.,Kong, X.F.,Wang, K.N.,Yuan, Z.,Wu, G.Y.,He, J.H.,Deng, Z.Y.,Fan, M.Z. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.7
Two experiments were conducted to determine the additivity of apparent or true digestibility of phosphorus (P) in soybean meal (SBM), peas, faba beans, corn, oats, broken rice meal, rough rice meal, buckwheat, and sorghum for growing pigs. Chromic oxide (0.3%) was used as a digestion marker in both experiments. Each experiment lasted for 12 d, which consisted of a 7-d dietary adaptation period followed by a 5-d fecal collection period. Experiment 1 involved 6 diets: the SBM-based control diet; 4 diets with corn, oats, rough rice meal and broken rice meal substituted for SBM; and an additional diet with a representative mixture of the 5 ingredients. In Experiment 2, 6 diets were prepared similarly, except that the tested ingredients besides SBM were faba beans, peas, buckwheat, and sorghum. In each experiment, six barrows with an initial average individual BW of 20.5 kg were fed one of the six diets according to a $6{\times}6$ Latin square design. The apparent and true P digestibility values for the nine tested ingredients were determined by the substitution method. There were no differences (p>0.05) between the determined and the predicted true P digestibility values for the mixture of ingredients in Experiments 1 and 2. However, the determined and the predicted apparent P digestibility values for the mixture of ingredients differed (p = 0.059) in Experiment 1, but not in Experiment 2. These results indicate that true P digestibility values are additive in ingredients containing low levels of phytate phosphorus and anti-nutritional factors, whereas the apparent P digestibility values are not always additive in single feed ingredients for growing pigs.
Generalized Set-valued Strongly Nonlinear Variational Inequalities in Banach Spaces
Y. J. Cho,Y. P. Fang,N. J. Huang,K. H. Kim 대한수학회 2003 대한수학회지 Vol.40 No.2
In this paper, we introduce and study a new class ofgeneralizedstrongly nonlinear variational inequalities with set-valued mappings. By using the KKM technique, we prove the existence and uniqueness of solution for this class of generalized set-valued strongly nonlinear variational inequalities in reflexive Banach spaces. Our results include the main results of Verma [16], [17] as special cases.
Y. J. Fang(방영젠),J. Suhr(서종환) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
With the help of selective laser melting (SLM) technique, austenitic stainless steels (SSs) with excellent strength and ductility have been successfully fabricated. However, the variety of SLM-fabricated austenitic SSs is limited. To develop more cost-effective SLM-fabricated austenitic SSs, a novel austenitic SS was successfully fabricated by SLM of a powder mixture composed of austenitic and ferritic SS powders, and the effect of laser energy density on the microstructure and mechanical properties of materials was investigated. At lowest energy density value (62.5 J/㎣), the phenomenon of lack of fusion was found and there were lots of ferrite with circular flow feature. With the increase of energy density, the porosity of materials was gradually decreased and the strength and elongation of materials were effectively increased. However, when energy density was highest (113.6 J/㎣), the occurrence of big keyhole pores severely weakened the tensile property of material. When an appropriate energy density was applied (89.3 J/㎣), sample displayed optimum ultimate tensile strength (675±4 MPa) and elongation (45.4±0.8%), which was mainly attributed to the formation of fine sub-grains. In addition, high strength could be attributed to formation of low-angle grain boundaries and dislocations, and low porosity of material.
Antimicrobial activity of eight root canal sealers before and after setting
Fang, Denny Y,Lee, WooCheol,Lai, Chern H 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.2
항균 활성도는 Root canal sealer가 갖추어야 할 필수요소 중 하나이다. 본 연구는 최근 임상술식에 사용되고 있는 8종의 root canal sealer의 근관내 혐기성 세균에 대한 항균효과를 알아보기 위해 시행되었다. 또한 본 연구에서는 혼합 직후의 경화되지 않은 sealer와 경화 7일 후 selaer의 항균효과도 비교하였다. 항균효과 측정을 위해 사용된 균주는 최근 실패한 근관치료 증례에서 배양되어 보고된 바 있는 Enterococcus faecalis와 근관내 주요 감염균인 그램음성 혐기성 세균은 Staphylococcus aureus를 대상으로 하였고, Agar diffusion test 방법을 사용하였다. 실험방법으로는 2개의 paper disk에 신선하게 혼합한 각각의 sealer를 도포하여 한개의 disk는 즉시 실험에 사용하고 다른 한개의 disk는 일주일간 혐기성 배양이게에서 경화시킨다음 사용한다. 각각의 균주를 Brucellar blood agar plate에 접종한 다음, sealer가 도포된 paper disk를 plate상에 올려놓는다. 대조군으로는 식염수에 침윤시킨 disc를 같은 방법으로 각 실험단계에 사용한다. 각 plate를 혐기성 배양기에서 48시간동안 배양한 뒤, 실험에 사용한 sealer의 항균효과를 6mm paper disk를 둘러싼 inhibition zone을 측정하여 평가한다. Fisher's PLSD 분석방법 결과 E.faecalis 에 대하여 경화 전과 후의 AH26 모두 경화 전과 후의 Roth 801, Dentalis, Apexit, AH Plus, RSA 그리고 경화 후의 MCS보다 유의성있게강한 항균효과를 나타내는 것으로 보고되었으며, 경화 후의 AH26은 경화 전의 AH26, 경화 전의 Ketac Endo, 경화 전의 MCS보다 통계학적으로 유의성이 있는 항균작용을 하는 것이 관찰되었다 (p<0.05). 경화 후 Roth 801, 경화전과 후의 Dentalis, AH plus, Apexit, RSA는 E.faecalis에 대한 항균효과를 나타내지 못하였다. S.aureus에 대하여 경화후의 AH26이 경화 전과 후의 Roth 801, Apexit, AH Plus, RSA보다 유의성있는 항균효과를 보이는 것을 발견할 수 있었고, 경화 전의 AH 26이 경화 AH plus보다 나은 항균효과를 나타냄을 알 수 있었다. 또, 경화 전과 후의 Apexit, 경화 후의 AH Plus, 경화 전과 후의 RSA에서는 S.aureus 에 대한 항균작용이 발견되지 않았다. 본 실험의 결과 AH26이 가장 강한 항균 작용을 갖는 것을 알 수 있었으며, 각 sealer의 경화 전과 후의 항균효과는 AH26이 경화전보다 경화 후에서 더 강한 항균효과를 나타내는 것 이외에는 효과의 차이가 없었다.