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한국과 일본의 초등학교 교사 양성체제에 관한 비교 연구 : 초등학교 과학교사를 중심으로
김재영,임채성,김경호,김남일,권치순,松本伸示 서울교육대학교 2003 한국초등교육 Vol.14 No.2
In this study, preparation system for elementary school science teacher in Korea and Japan was compared and analyzed. The study is composed of two parts. In the first part, the science curricula for elementary schools of the two nations were compared, and in the second part the preparation systems for teacher were compared. The results are as follows: First, the instructional hours allotted to science in Korea is higher than those of Japan. That is, while in Korea 102 instructional hours are allotted to science in every grade from 3rd to 6th grades, in Japan 70 hours are allotted in 3rd grade to 95 hours in 6th grade. Second, the science teacher-preparation systems of the two nations are differ manly in the courses provided to prospective elementary teacher. In Korea, the system is managed in purposeful, unified, and closed type, while in Japan the system is operated in several types, including parallel, integrative, connection of the undergraduate and graduate levels, and open types. Especially, in Korea the prospective teachers take subjects through relatively straightforward way which lacks of more specialized courses, and in Japan the courses are divided into three ways. including more specialized course for specific areas such as social science and science. which enable the prospective teachers to take the course on their decisions. Additionally, the areas of educational practices are more specifically divided in Japan. These results may have important implications for the preparation of able teachers for elementary science and improvement of quality of science instruction at schools.
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이상우,강호종,안상열,채윤석,윤재길,최경옥 진주산업대학교 농업기술연구소 2007 農業技術硏究所報 Vol.20 No.-
시중에 판매되고 있는 상토는 제조 회사에 따라 재료의 구성 및 혼합 비율이 다르다. 시판용상토를 제조사별로 구입하여 상토 제조사에 따라 배추 육묘기 묘소질에 미치는 영향에 대해 조사하였다. 상토 제조사 별로 배추의 지상부 및 지하부의 생육에 많은 차이가 있었다. 그리고 엽록소 함량 및 단백질 함량에도 차이가 많았으며, 엽록소 및 단백질 함량이 높았던 상토에서 배추의 생육이 좋았다. 상토 제조사별로 상토의 재료 및 혼합비율에 따라 배추의 유묘기 생육에 많은 영향을 미치는 것으로 나타났다. The substrate is very important to grow seedling because of directly effect on seedling quality of Chinese cabbage. The substrates manufactured by the companies consist of different materials and mixing ratios. This study was conducted to observe the seedling quality of Chinese cabbage by using of the kinds of substrate. The number of leaf, leaf area, fresh weight, dry weight, root length, root weight and T/R ratio of the seedling were shown in different from each substrate manufactured by the companies. And chlorophyll and protein content of the seedling were also shown in different from substrates supplied from the companies, respectively. Substrate which was high in that was also higher in seedling quality. The material and mixing ratios of substrate effected on the growth of cabbage
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Chae, Jae Kyoung,Subedi, Lalita,Jeong, Minsun,Park, Yong Un,Kim, Chul Young,Kim, Hakwon,Kim, Sun Yeou MDPI 2017 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.18 No.2
<P>Gomisin N, one of the lignan compounds found in <I>Schisandra chinensis</I> has been shown to possess anti-oxidative, anti-tumorigenic, and anti-inflammatory activities in various studies. Here we report, for the first time, the anti-melenogenic efficacy of Gomisin N in mammalian cells as well as in zebrafish embryos. Gomisin N significantly reduced the melanin content without cellular toxicity. Although it was not capable of modulating the catalytic activity of mushroom tyrosinase in vitro, Gomisin N downregulated the expression levels of key proteins that function in melanogenesis. Gomisin N downregulated melanocortin 1 receptor (MC1R), adenylyl cyclase 2, microphthalmia-associated transcription factor (MITF), tyrosinase, tyrosinase-related protein-1 (TRP-1), and tyrosinase-related protein-2 (TRP-2). In addition, Gomisin N-treated Melan-A cells exhibited increased p-Akt and p-ERK levels, which implies that the activation of the PI3K/Akt and MAPK/ERK pathways may function to inhibit melanogenesis. We also validated that Gomisin N reduced melanin production by repressing the expression of MITF, tyrosinase, TRP-1, and TRP-2 in mouse and human cells as well as in developing zebrafish embryos. Collectively, we conclude that Gomisin N inhibits melanin synthesis by repressing the expression of MITF and melanogenic enzymes, probably through modulating the PI3K/Akt and MAPK/ERK pathways.</P>
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Kang, Jae Kyoung,Lee, Jae Seong,Suh, Michelle,Lim, Gil Chae,Shin, Myoung Soo,Yun, Byung Min Korean Cleft Palate-Craniofacial Association 2019 Archives of Craniofacial Surgery Vol.20 No.5
Cochlear implant extrusion, which is a common complication of cochlear implants, is generally repaired by a well visualized soft-tissue flap. A 61-year-old female patient with a medical history of schizophrenia who had a skin ulcer that caused cochlear implant extrusion, but that would be a stronger statement was referred to our department for removal of the implant and reconstruction of the resultant scalp defect. Accordingly, the broad defect was covered via rotation of a temporoparietal fascia flap (TPFF) using the superficial temporal artery, with the pedicle in the preauricular region as the pivot point. Coverage of TPFF was achieved with a split-thickness skin graft using the scalp as the donor site, which led to a quick recovery after the operation and satisfactory results in terms of aesthetics. This case suggests that a TPFF might be used as a flexible flap with low donor site morbidity for reconstructing cases of cochlear implant extrusion accompanied by a large full-layer scalp defect.
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The Effect of Hydroxyapatite on Bonding Strength in Light Curing Glass Ionomer Dental Cement
Chae, M.H.,Lee, Yong Keun,Kim, Kyoung Nam,Lee, Jae Hoon,Choi, B.J.,Choi, H.J.,Park, K.T. Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.309 No.-
<P>The mineral phase of bone and teeth is mainly hydroxyapatite. Currently there are numerous researches being conducted on the effect of the addition of hydroxyapatite to dental materials. Among them, several studied were published stating that the addition of hydroxyapatite to composite resin or glass ionomer cement resulted in an improvement in bonding strength and physical properties Therefore, this study will investigate the effect that the addition of hydroxyapatite to light curing glass ionomer cement has on bonding strength. Two different light curing glass ionomer cement products were selected (FujiⅡLC, GC Cor, Japan and Vitremer™ , 3M/ESPE, USA) and hydroxyapatite was mixed into the light curing glass ionomer cement at various concentrations to create hydroxyapatite-light curing glass ionomer cement mixture. In order to confirm that hydroxyapatite-light curing glass ionomer cement met the basic requirements of dental materials, sensitivity to ambient light, depth of cure, and flexural strength were tested. From the results of the above mentioned tests, the hydroxyapatite-light curing glass ionomer cement with the most superior physical properties for each product (15% HA-Fuji Ⅱ LC, 20% HA-Vitremer™)was bonded to the teeth and then immersed in artificial saliva(36.5°C) for four weeks. Finally the sectioned surface was observed under SEM after measuring the bonding strength. As the hydroxyapatite concentration increased, the depth of cure decreased. However flexural strength increased and there was not much change in the sensitivity to ambient light. Bonding strength, which was the main focus of this study, increased with the addition of hydroxyapatie and scanning electron microscope findings show a more cohesive type of fracture in the material with bone like apatite material formation along the tooth-material interface.</P>
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Kyoung Hun Kim,Joo Seok Park,Byung Ha Lee,K. B. Shim,Jong Pil Ahn,Jae Hong Chae 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1
Spark plasma sintering (SPS) of AlN ceramics was carried out with Y₂O₃ as a sintering additive at sintering temperatures of 1,550 to 1,700 ℃. The effects of Y₂O₃ additions on the sintering behavior and thermal conductivity of AlN ceramics were studied. Y₂O₃ added to AlN showed a noticeable higher densification rate than pure AlN, but the formation of yttrium aluminate phases by the solid-state reaction of Y₂O₃ and Al2O3 occurred on the AlN surface which could retard the densification during the sintering process. The thermal conductivity of AlN specimens was improved by the addition of Y₂O₃ up to 3 wt% in spite of the formation of a YAG secondary phase in the AlN grain boundaries because Y₂O₃ additions could reduce the oxygen content in the AlN lattice which is primary factor controlling the thermal conductivity. However, the thermal conductivity decreased at a 5 wt% addition because the extra formation of the YAG phase in grain boundaries could decrease the thermal conductivity by phonon scattering thus surpassing the helpful contributions of smaller Y₂O₃ additions. Spark plasma sintering (SPS) of AlN ceramics was carried out with Y₂O₃ as a sintering additive at sintering temperatures of 1,550 to 1,700 ℃. The effects of Y₂O₃ additions on the sintering behavior and thermal conductivity of AlN ceramics were studied. Y₂O₃ added to AlN showed a noticeable higher densification rate than pure AlN, but the formation of yttrium aluminate phases by the solid-state reaction of Y₂O₃ and Al2O3 occurred on the AlN surface which could retard the densification during the sintering process. The thermal conductivity of AlN specimens was improved by the addition of Y₂O₃ up to 3 wt% in spite of the formation of a YAG secondary phase in the AlN grain boundaries because Y₂O₃ additions could reduce the oxygen content in the AlN lattice which is primary factor controlling the thermal conductivity. However, the thermal conductivity decreased at a 5 wt% addition because the extra formation of the YAG phase in grain boundaries could decrease the thermal conductivity by phonon scattering thus surpassing the helpful contributions of smaller Y₂O₃ additions.
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Sintering behavior and mechanical properties of B4C ceramics fabricated by spark plasma sintering
Kyoung Hun Kim,심광보,Jae Hong Chae,Joo Seok Park,Jong Pil Ahn 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
The sintering behavior, microstructure and mechanical properties of boron carbide ceramics, which were fabricated by a spark plasma sintering process, were investigated. The relative density of B4C ceramics using a spark plasma sintering method reached as high as 99% theoretical at a lower temperature than a conventional sintering method, and in addition, without any sintering additives. The mechanical properties of B4C ceramics could be improved by soaking at 1,300 oC during the sintering process which removed the B2O3 phase from the B4C powder surface. A remarkable improvement of mechanical properties could be achieved by the introduction of a soaking process during the spark plasma sintering process. In particular, the fracture toughness values of the specimens which experienced the B2O3 removal process improved by over 30% compared with the specimens without this process. These achievements resulted from the formation of a fine and homogeneous microstructure because the grain coarsening was suppressed by the elimination of the B2O3 phase.
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