http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
SEO, Byoung-Joo,SONG, Eu-Tteum,LEE, Kichan,KIM, Jong-Won,JEONG, Chang-Gi,MOON, Sung-Hyun,SON, Jee Soo,KANG, Sang Hyeon,CHO, Ho-Seong,JUNG, Byeong Yeal,KIM, Won-Il The Japanese Society of Veterinary Science 2018 The Journal of veterinary medical science Vol.80 No.6
<P>The broad-spectrum lytic capability of <I>Salmonella</I> bacteriophages against various <I>Salmonella</I> species was evaluated to determine their potential as an alternative for antibiotics, and the safety and preventive effects of the bacteriophages were assessed on mice and pigs. Four bacteriophage cocktails were prepared using 13 bacteriophages, and the lytic capability of the four bacteriophage cocktails was tested using <I>Salmonella</I> reference strains and field isolates. Bacteriophage cocktail C (SEP-1, SGP-1, STP-1, SS3eP-1, STP-2, SChP-1, SAP-1, SAP-2; ≥10<SUP>9</SUP> pfu/m<I>l</I>) showed the best lytic activity against the <I>Salmonella</I> reference strains (100% of 34) and field isolates (92.5% of 107). Fifty mice were then orally inoculated with bacteriophage cocktail C to determine the distribution of bacteriophages in various organs, blood and feces. The effects of bacteriophages on <I>Salmonella</I> infection in weaned pigs (n=15) were also evaluated through an experimental challenge with <I>Salmonella</I> Typhimurium after treatment with bacteriophage cocktail C. All mice exhibited distribution of the bacteriophages in all organs, blood and feces until 15 days post infection (dpi). After 35 dpi, bacteriophages were not detected in any of these specimens. As demonstrated in a pig challenge study, treatment with bacteriophage cocktail C reduced the level of <I>Salmonella</I> shedding in feces. The metagenomic analyses of these pig feces also revealed that bacteriophage treatment decreased the number of species of the Enterobacteriaceae family without significant disturbance to the normal fecal flora. This study showed that bacteriophages effectively controlled <I>Salmonella</I> in a pig challenge model and could be a good alternative for antibiotics to control <I>Salmonella</I> infection.</P>
Seo, Gi Ho,Yun, Da Jeong,Lee, Won Ho,Yoon, Sung Min IOP 2017 Nanotechnology Vol.28 No.7
<P>ZnO nanoparticles (NPs) with monolayer structures were prepared by atomic layer deposition (ALD)?to?use for a charge-trap layer (CTL) for nonvolatile memory thin-film transistors (MTFTs). The optimum ALD temperature of the NP formation was demonstrated to be 160 °C. The size and areal density of the ZnO NPs was estimated to be approximately 33 nm and 4.8?×?10<SUP>9</SUP> cm<SUP>−2</SUP>, respectively, when the number of ALD cycles was controlled to be 20. The fabricated MTFTs using a ZnO-NP CTL exhibited typical memory window properties, which are generated by charge-trap/de-trap processes, in their transfer characteristics and the width of the memory window (MW) increased from 0.6 to 18.0 V when the number of ALD cycles increased from 5 to 30. The program characteristics?of the MTFT were markedly enhanced by the post-annealing process performed at 180 °C in an oxygen ambient due to the improvements in the?interface and bulk qualities of the ZnO NPs. The program/erase (P/E) speed was estimated to be 10 ms at P/E voltages of −14 and 17 V. The memory margin showed no degradation with the lapse?in retention time for 2?×?10<SUP>4</SUP> s and after the repetitive P/E operations of 7?×?10<SUP>3</SUP> cycles.</P>
Seo, Dong-Jun,Kim, Myeong-Ri,Yang, Seung Yong,Choi, Won-Young,Choi, Hyunguk,Choi, Seo-Won,Lee, Myeong-Hwa,Yoon, Young-Gi,Seo, Min-Ho,Kim, Hansung,Jung, Chi-Young,Kim, Tae-Young Elsevier 2018 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.43 No.37
<P><B>Abstract</B></P> <P>Control of doping levels of nitrogen to carbon support plays a key role to enhance the catalytic activity of the Pt/C catalyst toward oxygen reduction reaction. Mass-production of such materials is still challenging issue for the practical use. Here, we demonstrate a facile approach for fabrication of the nitrogen-doped Pt/C catalysts via direct soft nitriding of the Pt/C catalyst. The commercial 40 wt% Pt/C is first physically mixed with urea and then heat-treated at 300 °C, which allowed a massive production of the 6.6 atom% nitrogen-doped Pt/C catalysts without sacrificing the Pt catalysts. The specific activity increases by 46.9% after the thermal treatment, while the particle size and crystallinity of Pt remain similar to those before the thermal treatment. As a result, the fuel cell test showed a notable increase in the current density by 100% and 18.5% at 0.8 V and 0.5 V, respectively, for the membrane electrode assembly employing urea treated Pt/C catalyst. Hence, the soft nitriding by urea offers great promise as a simple, energy-efficient and eco-friendly way in manufacturing the nitrogen-doped Pt/C catalyst for the polymer electrolyte membrane fuel cell applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A facile method in preparing N-doped Pt/C is demonstrated via soft nitriding. </LI> <LI> Thermally decomposed urea at 300 °C served as the N doping source. </LI> <LI> 6.6 atom% N-doped Pt/C can be massively produced without sacrificing Pt. </LI> <LI> In acidic condition, the specific activity increases by 46.9% after soft nitriding. </LI> <LI> Cell current density increased by 100% and 18.5% at 0.8 V and 0.5 V, respectively. </LI> </UL> </P>
Seo, Gi‐,Young,Thoma, Daniel Stefan,Jung, Ui‐,Won,Lee, Jung‐,Seok John Wiley Sons, Inc. 2019 JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B Vol.107 No.3
<P><B>ABSTRACT</B></P><P><B>Objectives</B></P><P>To histologically determine the alteration in horizontal mucosal thickness at sites that received guided bone regeneration (GBR) with additional use of collagen matrix and to assess whether bone formation is affected by adding collagen matrix at GBR sites at 8 weeks of healing.</P><P><B>Materials and methods</B></P><P>Eight weeks after bilateral extraction of maxillary premolars, standardized defects were created on buccal side of edentulous ridges in four beagle dogs. One side was randomly allocated as control (biphasic calcium phosphate plus collagen membrane; GBR only), while contralateral side was allocated as test (biphasic calcium phosphate plus collagen membrane plus an additional layer of collagen matrix). Histologic observations, histomorphometric and micro‐computed tomography analyses were performed after 8 weeks.</P><P><B>Results</B></P><P>Membrane complex comprising residual collagen membrane and adjacent dense connective tissue was observed at both control and test sites. The thickness in the histologic analysis were 1.69 ± 0.23 mm (control) and 1.76 ± 0.07 mm (test) in histologic analysis and were 2.03 ± 0.26 mm (control) and 2.14 ± 0.24 mm (test) in radiographic analysis. The thickness of the membrane complex in soft‐tissue layer were 723.0 ± 241.6 μm (control) and 984.6 ± 334.4 μm (test). The percentage of new bone formation were 22.30 ± 5.92% (control) and 25.50 ± 8.08% (test). All measured outcome did not show significant differences between control and test groups.</P><P><B>Conclusion</B></P><P>The addition of collagen matrix on top of standard GBR procedure did not increase the soft tissue thickness and dense connective tissue formation at 8 weeks of healing. Bone regeneration was not affected by the addition of collagen matrix. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 741–749, 2019.</P>
Seo, Dae-Won,Jeon, Gi-Young,Song, Kang-Hyun Korean Society of Ocean Engineers 2018 Journal of advanced research in ocean engineering Vol.4 No.4
A ship repeatedly face free surface under rough sea conditions owing to relative motion with wave encounter. The impact pressure is transferred to the hull structure and causes structural damage. In this study, the bow flare slamming load of a container ship is estimated using computations fluid dynamics (CFD) and prescript formula according to various classifications. It is found that the bow flare slamming load calculated by the formulas of the common structural rule and ABS tends to be similar to the CFD results.
A 90-nm CMOS 144 GHz Injection Locked Frequency Divider with Inductive Feedback
Seo, Hyo-Gi,Seo, Seung-Woo,Yun, Jong-Won,Rieh, Jae-Sung The Institute of Electronics and Information Engin 2011 Journal of semiconductor technology and science Vol.11 No.3
This paper presents a 144 GHz divide-by-2 injection locked frequency divider (ILFD) with inductive feedback developed in a commercial 90-nm Si RFCMOS technology. It was demonstrated that division-by-2 operation is achieved with input power down to -12 dBm, with measured locking range of 0.96 GHz (144.18 - 145.14 GHz) at input power of -3 dBm. To the authors' best knowledge, this is the highest operation frequency for ILFD based on a 90-nm CMOS technology. From supply voltage of 1.8 V, the circuit draws 5.7 mA including both core and buffer. The fabricated chip occupies 0.54 mm ${\times}$ 0.69 mm including the DC and RF pads.