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Chang-Lun Liao,Kuan-Hong Lin,Shun-Tian Lin 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.6
The microstructures and dielectric properties of Ba0.88(Nd1.40Bi0.42La0.30)Ti4O12/ alkali-borosilicate glass composites were investigated in this study, with the volume percentage of the glass phase in the composite being either 50, 55, or 60 vol.%. Sintered density measurements indicated that the density increased with an increase in the sintering temperature for the composites with 50 and 55 vol.% glass additions, but, at a sintering temperature higher than 800 oC, the density decreased for the composite with a 60 vol.% glass addition. XRD patterns revealed that the peak of the highest intensity in the B(NBL)T crystal belongs to the (401) crystal plane, while that in the B(NBL)T/glass composites to the (320) crystal plane. Along with the change in crystalline preferred orientation, the lattice constants of the crystal also changed. SEM micrographs indicated that the B(NBL)T phase developed into columnar grains at sintering temperatures higher than 1260 oC. Moreover, when glass was added, the grain morphology changed, especially at sintering temperatures higher than 850 oC. When sintered at 950 oC for 2 hours, the composite with 55 vol.% glass yielded the highest dielectric constant (εr= 23.2), the lowest dielectric loss (tanδ = 4.1 × 10-3), and a high Q×f value (Q × f = 1,620 GHz, Q = 1/tanδ, f = 6.67 GHz). The microstructures and dielectric properties of Ba0.88(Nd1.40Bi0.42La0.30)Ti4O12/ alkali-borosilicate glass composites were investigated in this study, with the volume percentage of the glass phase in the composite being either 50, 55, or 60 vol.%. Sintered density measurements indicated that the density increased with an increase in the sintering temperature for the composites with 50 and 55 vol.% glass additions, but, at a sintering temperature higher than 800 oC, the density decreased for the composite with a 60 vol.% glass addition. XRD patterns revealed that the peak of the highest intensity in the B(NBL)T crystal belongs to the (401) crystal plane, while that in the B(NBL)T/glass composites to the (320) crystal plane. Along with the change in crystalline preferred orientation, the lattice constants of the crystal also changed. SEM micrographs indicated that the B(NBL)T phase developed into columnar grains at sintering temperatures higher than 1260 oC. Moreover, when glass was added, the grain morphology changed, especially at sintering temperatures higher than 850 oC. When sintered at 950 oC for 2 hours, the composite with 55 vol.% glass yielded the highest dielectric constant (εr= 23.2), the lowest dielectric loss (tanδ = 4.1 × 10-3), and a high Q×f value (Q × f = 1,620 GHz, Q = 1/tanδ, f = 6.67 GHz).
김창석,이우선,정천옥,김병인 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2
In these days, the thinner film of dielectric materials is required while it's capacitance is required to be still large at the VLSI process. Most of such VLSI have MOS structures. For the research on this requirement, MOS capacitors were fabricated on the silicon wafer in four different thickness groups by RF sputtering method. SiO of the SiO/TiN film is used as the insulating layer and TIN is chosen as the barrier against the diffusion of Al which is the terminal connected by ohmic contact because TIN has the advantageous properties such as good thermal stability and very low diffusion rate in spite of it's relatively low specific resistance. In this study their electrical and optical characteristics are investigated to find refractive index, absorption coefficient and Permittivity.
Tennis 競技에 있어서 得失點에 關한 要因分析 : 女子單式 競技를 中心으로 focused on women's single game
金善應,張仁鉉,許正 慶北大學校 師範大學 1981 體育學會誌 Vol.7 No.-
We obtained the following results derived from the previously described observation and analysis: 1. In the service, the errors by the receive miss and double fault gave greater influence on gain or loss than the gaining points by the ace service. 2. In the practical game, to reduce the losing points by steady placements is more desirable than the strong strokes. 3. The back-hand strokes are the most important in win or loss of game because they attack on the general weak points of the opponent's back-hand strokes in the singles game. 4. The half volley, smash, lob, drop shot and no touch which are known as the offensive plays don't occur many times in a game, So the defensive base line play is usually prefered in the Korean women's single tennis game. 5. The losing points by errors give more influences on the win or loss of the game because no touch play loses more points than the passing shot. 6. In the games of the girl's high school students, the winners gained more points than the lost in the play of volley, passing and lob. The winners of adult women didn't make much mistakes in service, and the similar phenomena was also occured in then fore-hand strokes and back-hand strokes.
이성호,최순식,강희창 서울産業大學校 1999 논문집 Vol.49 No.2
A channel selector for wireless optical communication systems is developed using differential detection. The channel selector is composed of three photodiodes and two differential amplifiers. When two independent optical channel beams are overlapped, two pairs of the three photodiodes selet the two channels separately using differential detection method. The implementation of the channel selector is very simple and effective in an environment that two optical beams interfere each other.
고정층과 순환유동층에서 CaSO_4의 환원반응에 대한 온도와 CO농도의 영향
배달희,류호정,박재현,이창근,선도원,이동규 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.1
순환유동층 석탄연소로에서 석회석에 의한 찰황반응에 영향을 미치는 CaSO_4의 환원반응에 의한 SO-2 재배출을 실험적으로 확인하고 SO_2의 재배출에 미치는 온도와 CO 농도의 영향에대해 상용 순환유동층에 적용할 수 있는 기초자료를 확보하기 위해 고정층과 순환유동층에서 층물질로 석회석과 상용 순롼 유동층 하부회를 이용하여 환원실험을 수행하였으며 CaSO_4의 환원반응에 미치는 온도와 CO의 영향을 측정 및 해석하였다. 고온조건에서 CO가 환원제로 작용하여 C_aSO_4로부터 SO_2가 재배출되는 현상을 확인하였으며 CaSO_4로부터 SO_2의 재배출은 온도와 CO농도가 증가함에 따라 증가하였다. 본 실험의 결과에 의해 온도가 증가함에 따라 석회석에 의한 탈황율이 감소하는 현상을 환원이론으로 설명할 수 있다는 것이 확인되었다. For qualitative understanding of the sulphur capture process in a circulating fluidized bed fumace, the effects of temperature and CO concentration on the reactivity of partially sulfated CaO were experimentally examined. The tests were performed in a fixed bed reactor and lab-scale circulating fluidized bed reactor. The materials used were partially sulfated domestic limestone and bottom ash drained from commercial circulating fluidized bed furnaces. The re-emission of SO_2 from partially sulfated limestone and bottom ash increases with temperature as well as with concentration of the reducing agent CO. From the results of this study, the temperature dependence of sulfation could be explained by reduction theory.
Gap-flow patterns behind twin-cylinders at low Reynolds number
Shun Chang Yen,Chien Ting Liu 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
The flow structures, drag coefficients (Cd) and vortex shedding characteristics around a single square cylinder and twin side-by-side square cylinders were experimentally investigated with various Reynolds numbers (Re) and gap ratios (g*) in a vertical water tunnel. The Reynolds number (Re) and gap ratio (g*) were 178 < Re < 892 and 0 ≤ g* ≤ 2.5, respectively. The flow patterns and vortex shedding frequency were determined using the particle tracking flow visualization (PTFV). The flow structures, velocity properties, and drag coefficients were calculated using the particle image velocimetry (PIV). The topological flow patterns of vortex evolution processes were plotted and analyzed based on critical point theory. Furthermore, the flow structures behind twin side-by-side square cylinders were classified into three modes — single vortex-street mode, gap-flow mode and couple vortex-streets mode. The maximum Cd occurred in the single vortex-street mode, and the minimum Cd occurred in the gap-flow mode. The highest Strouhal number (St) occurred in the single vortex-street mode, and the lowest St occurred in the gap-flow mode.
Shun-Chiao Chang 연세대학교 동서문제연구원 2014 Global economic review Vol.43 No.3
The study attempts to investigate the features and determinants of China’s outward foreign direct investment (OFDI) into 138 countries and Chinese firms’ investment strategies over the 2003–2009 period using an augmented gravity model with spatial linkages. The respective evaluations of China’s OFDI are indicative of the important role played by non-financial OFDI. At the same time, Chinese firms prefer to invest in high-tech industries in developed countries while also focusing on the extraction of natural resources around the world. The empirical findings show that the host country’s economic size has a significantly positive effect in terms of promoting Chinese OFDI. Chinese firms favour a complex-vertical platform in the developed countries while they prefer a market potential foreign direct investment (FDI) surrounding the host developing countries and an export-platform FDI in the petroleum exporting countries based on the surrounding market potential effect and spatial effect. The fuel extraction motive plays a key role in China’s OFDI in line with the realities of Chinese FDI strategies in recent years.
Shun-Chiao Chang 연세대학교 동서문제연구원 2009 Global economic review Vol.38 No.1
This study investigates the features and determinants of the horizontal and vertical intra-industry trade (HIIT and VIIT) and firms’ investment strategies of the information and communications technology (IT) industry in the Asian, European Union and US markets from 1996 to 2005. The respective evolutions of the HIIT and VIIT of the IT industry indicate that HIIT has often dominated VIIT in the IT industry, which is obviously contrary to the present pattern of world trade. The empirical results further reveal the principal pattern of the IT firms’ foreign direct investment strategies as facilitating the market rather than seeking efficiency in the host regions. The effect of revealed comparative advantage in relation to VIIT and HIIT demonstrates that vertical specialization is significant between Asia and the EU whereas horizontal specialization plays a key role between Asia and the US. The Asian financial crisis significantly promoted VIIT in regard to Asian IT firms in the US market. Finally, regional trade associations such as the EU and ASEAN have strengthened the vertical specialization of EU IT firms in Asian countries. This study investigates the features and determinants of the horizontal and vertical intra-industry trade (HIIT and VIIT) and firms’ investment strategies of the information and communications technology (IT) industry in the Asian, European Union and US markets from 1996 to 2005. The respective evolutions of the HIIT and VIIT of the IT industry indicate that HIIT has often dominated VIIT in the IT industry, which is obviously contrary to the present pattern of world trade. The empirical results further reveal the principal pattern of the IT firms’ foreign direct investment strategies as facilitating the market rather than seeking efficiency in the host regions. The effect of revealed comparative advantage in relation to VIIT and HIIT demonstrates that vertical specialization is significant between Asia and the EU whereas horizontal specialization plays a key role between Asia and the US. The Asian financial crisis significantly promoted VIIT in regard to Asian IT firms in the US market. Finally, regional trade associations such as the EU and ASEAN have strengthened the vertical specialization of EU IT firms in Asian countries.
Expression of glucose transporters in the developing rat skin
Chang Seok Oh,Jong Ha Hong,Shun Nu Jin,Wang Jae Lee,Young Soo Lee,Eunju Lee 대한해부학회 2017 Anatomy & Cell Biology Vol.50 No.3
We found the changed distribution of glucose transporter (GLUT) proteins in the skin during rat development. At 15 days of gestation, GLUT1 and 2 proteins were expressed in the stratum corneum of epidermal cells. In postnatal skin, however, GLUT1 and 2 exhibit different expression patterns. While GLUT1 expression becomes more restricted to the stratum basale with development, GLUT2 was found mainly in stratum spinosum and granulosum, but not being localized in the stratum basale at any stages of perinatal skin development. Considering all these, it can be speculated that each GLUT protein plays its specific role in different epidermal layers and that the glucose used in mammalian skin in utero could be originated from the amniotic fluid during skin development.