Amine-functionalized graphene was synthesized via a one-step solvothermal method and used as a metal-free cathode for non-aqueous lithium–oxygen batteries. The material delivered an outstanding specific capacity of 19,789 mAh/g at a current density of 200 mA/g as well as better cycling stability than graphene without the amine functional group. This improvement was attributed to the electron-donating effect of the amine groups and appropriate mesopore volume, which can promote the penetration of oxygen, electrons, and lithium ions, as well as accommodate more discharge products, Li2O2 in Li–O2 batteries. Amine-functionalized graphene has an amine functional group on the carbon surface, which improves the electrical conductivity of carbon and provides electrochemical active sites for oxygen absorption reactions.

High-level heteroatom, N and S, dual-doped graphene with an improved mesoporous structure was fabricated via facile in situ carbonization and used as metal-free cathode for non-aqueous lithium oxygen batteries. The prepared cathode delivered an ultrahigh specific capacity of 22,252 mAh/g at a current density of 200 mA/g as well as better cycling reversibility because of the larger and copious mesopores, which can promote the penetration of oxygen, electrons, and lithium ions and the ability to accommodate more discharge products, e.g., Li2O2, in Li–O2 batteries. The material had a high level of heteroatom co-doping in the carbon lattice, which enhanced the electrical conductivity and served as active sites for the oxygen reduction reaction.

Recently, young people wearing hanbok are highly visible in the palace and in Hanok Village. However, there is much controversy regarding whether the hanbok the young people are wearing is traditional. Young people in Korea are exposed to hanbok through a variety of ways such as school education, games, webtoons, television shows, and movies. In this study, we presented teenagers with illustrations of hanbok to see which they preferred and which if any they recognized as traditional. The study respondents most preferred the hanbok from the 18th century, but they considered the hanbok from the 20th century to be the traditional style. We next used text mining to analyze the students’ freely written, open-ended responses regarding the hanbok they preferred and the one they considered traditional. The hanbok from the 18th century, the one the teenagers preferred, was a sexy, cool style related to gisaeng that emphasized the waist, whereas the hanbok they believed was traditional, the 20th-century hanbok, was simple, neat, comfortable, and plain. Among the young people’s responses regarding which hanbok was traditional, the text mining extracted the following repeated words related to both the 18th- and 20th-century hanbok: “dramas,” “mass media,” “historical dramas,” and “movies.” For the 18th-century hanbok only, we extracted “webtoons” and “Hanok Village,” and for only the 20th-century hanbok, we extracted “textbooks.”

Recently, Metcalfa pruinosa is the pest that can not be easily controlled due to its wide host range. Therefore, it seems necessary to develop a trap plant that can block the entry of M. pruinosa into the farm. We have examined the host preference of M. pruinosa in previous studies and verified their attractiveness to these pests for some favored plants(bean, perilla, sunflower and sesame). We divided the plants used in the experiment into young and maturing stages. In the yougn stage of the plant, the soybeans were highly suscetible to M. pruinosa, but the sunflower was the most influential in the mature stage. Therefore, we selected sunflower as a trap plant to M. pruinosa and conducted a field survey. The sunflower attracted effectivley M. pruinosa in aronia cultivation system. But the time of our experiments was at the nymphal stages of M. pruinosa and at the beginning of adult emergence. Therefore, we plan to conduct experiments at the peak period of adult emergence and develop the trap with attractants.

The water-swollen hydrogels containing silicone or fluorine were prepared by copolymerization of 2-hydroxy ethyl methacylate (HEMA) with 3-(trimethoxysilyl)propyl methacrylate(SM) or 2,2,2-trifluoroethyl acrylate(FA). When the content of SM or FA increased in copolymers, there was tendency of water absorbance to decrease, whereas contact angles to increase. The hydrogels containing FA showed 2 ~ 4% higher water content and 4 ~ 5% lower contact angles compared to that of SM. Tensile strengths decreased as the content of SM increased. However, FA exhibited strength of 2.2 Mpa/cm2 which is similar to 2.3 Mpa/cm2 of B. FA, which implies comparatively low adherence, hence, showed better protein resistance properties than SM-based hydrogel. The photo-polymerization was also applied instead of thermal polymerization to enhance the energy efficiency. As a result, the reaction yield reached over 95% within 1 minute.

The Digital Single Lens Reflex (DSLR) camera combined with a small aperture telescope is an efficient equipment for an astronomy-related lab exercise. This paper compares the different photometry softwares to provide insights on using the GUI-based photometry tool to the conventional command-line based photometry tool. The magnitude of the same point source measured within the aperture is consistent regardless of the software used although the background estimation, partial pixel treatment, and error estimation are slightly different. In a crowded field image where the aperture photometry is less reliable, the aperture photometry with varying aperture size is useful to see the qualitative trend for the magnitude. Due to the variation in ISO settings and the color dependence on the RGB Bayer system, an initial uncertainty of ~0.15mag is expected to be embedded in the magnitude derived from the DSLR images.

목 적: 국내 및 해외 안경사의 직무범위와 국가시험 제도를 비교 분석하여, 국가시험 개선방향에 지표로 삼을 수 있도록 하고자 한다. 방 법: 국가시험관련 자료를 분석하여 국내 안경사의 직무범위와 시험제도를 해외 안경사와 비교분석해 보았으며, 실기시험 도입의 효과에 대해 안경사를 상대로 설문조사를 실시하였다. 결 과: 미국, 일본, 독일, 호주 등 안경사 면허제도가 체계화된 외국의 경우 다양한 형태로 임상실기시험 이 치러지고 있었다. 그러나 국내 안경사제도는 외국의 조제안경사(dispensing optician)와 검안사 (optometrist)의 직무를 포괄하는 제도로 운영되고 있으며, 국가시험에서는 실기과목을 30년째 이론시험으 로 대체하고 있어 실무능력을 제대로 평가하지 못하고 있다. 전국 안경사 설문조사 결과에 의하면 이러한 문 제로 발생한 신입안경사의 낮은 실무능력을 자체적으로 향상시키기 위해 재교육을 실시하고 있었다. 결 론: 시험제도는 교육현장의 질적 향상을 견인한다는 의미에서 시험제도의 체계적인 검토와 논의를 통 한 개선점 도출이 안경사 교육의 질 관리에 간접적으로 기여할 것으로 기대한다.

The purpose of this study is to develop a multi-dimensional scale measuring consumers’ perceived challenge in shopping fashion products online, and to verify its validity and reliability. Relevant literature is first reviewed to identify possible dimensions of perceived challenge. Next, Study 1 is conducted in order to explore the dimensions empirically and to see whether the dimensions that emerged were consistent with prior findings. A total of 190 responses to an open-ended question was qualitatively analyzed by using content analysis. The findings of Study 1 generate 26 items reflecting four dimensions (i.e., product knowledge, previous experience, website functionality, and product availability), which correspond to the dimensions suggested in literature review. Study 2 is subsequently conducted to refine the items so that the perceived challenge scale establishes cross-validation, convergent validity, discriminant validity, reliability, and predictive validity. A total of 238 responses is quantitatively analyzed by using exploratory factor analysis, confirmatory factor analysis, and structural equation modeling. In the results of Study 2, the perceived challenge scale is found to consist of a total of 16 items reflecting three dimensions: E-commerce Challenge (corresponding to Previous Experience reported in Study 1), Retailer Challenge (corresponding to Website Functionality), and Product Challenge (corresponding to Product Knowledge); all Product Availability items have been eliminated through the item refinement process. Specifically, E-commerce Challenge and Retailer Challenge are found to predict flow, supporting flow theory, while Product Challenge fails to lead to flow significantly. Implications, limitations, and suggestions for future studies are also discussed.

Growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15) are oocyte-specific growth factors that regulate many critical processes involved in early folliculogenesis and oocyte maturation. In this study, effects of GDF9 and BMP15 treatment during in vitro maturation of porcine oocytes upon development after parthenogenetic activation were investigated. Neither GDF, BMP15 alone nor in combination affects the number and viability of cumulus cells or the rates of oocyte maturation and blastocyst development. However, the treatment of GDF9 on porcine oocytes increased the number of trophectodermal (TE) cells of blastocysts derived from activated oocytes (P<0.05). The treatment of BMP15 increased the cell numbers of both inner cell mass (ICM) and TE cells (P<0.05). The treatment with the combination of GDF9 and BMP15 further increased the numbers of ICM and TE cells, compared with GDF9 or BMP15 treatment alone (P<0.05). In conclusion, the treatment of GDF9 or BMP15 (or both) enhanced the quality of blastocysts via the increased number of ICM and/or TE cells.

Xenotransplantation involves multiple steps of immune rejection. The present study was designed to produce nuclear transfer embryos, prior to the production of transgenic pigs, using fibroblasts carrying transgenes human complement regulatory protein hCD59 and interleukin-18 binding protein (hIL-18BP) to reduce hyperacute rejection (HAR) and cellular rejection in pig-to-human xenotransplantation. In addition to the hCD59-mediated reduction of HAR, hIL-18BP may prevent cellular rejection by inhibiting the activation of natural killer cells, activated T-cell proliferation, and induction of IFN-γ. Transgene construct including hCD59 and ILI-18BP was introduced into miniature pig fetal fibroblasts. After antibiotic selection of double transgenic fibroblasts, integration of the transgene was screened by PCR, and the transgene expression was confirmed by RT-PCR. Treatment of human serum did not affect the survival of double-transgenic fibroblasts, whereas the treatment significantly reduced the survival of non-transgenic fibroblasts (p<0.01), suggesting alleviation of HAR. Among 337 reconstituted oocytes produced by nuclear transfer using the double transgenic fibroblasts, 28 (15.3%) developed to the blastocyst stage. Analysis of individual embryos indicated that 53.6% (15/28) of embryos contained the transgene. The result of the present study demonstrates the resistance of hCD59 and IL-18BP double-transgenic fibroblasts against HAR, and the usefulness of the transgenic approach may be predicted by RT-PCR and cytolytic assessment prior to actual production of transgenic pigs. Further study on the transfer of these embryos to surrogates may produce transgenic clone miniature pigs expressing hCD59 and hIL-18BP for xenotransplantation.

We classified Abell clusters using the magnitude differences between two or three bright member galaxies and investigated how such classification was correlated with the properties of brightest cluster galaxies (BCGs). S-type BCGs being clearly brighter than the rest of the member galaxies were likely to be red, luminous, and evolved as early type galaxies. On the other hand, T-type BCGs being not dominant at all were less luminous than early type galaxies. A small fraction of BCGs was currently forming stars, and all of the star-forming BCGs were T-type BCGs. Active galactic nuclei were most frequent for S-type BCGs. Through these quantitative analyses of the BCG properties, we discussed the possible scenario of BCG formation and the differences between S-type and T-type of BCGs.