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SangHyun Lee,MinTae Lee,ChunOk Chang,Yeongcheon Lee,ByungKi Kim 한국멀티미디어학회 2008 한국멀티미디어학회 국제학술대회 Vol.2008 No.-
This study is conducted with the intent of proposing a more supportive educational environment for handicapped students and presenting alternatives to the current school system where rules are implemented for non-handicapped students only. The e-learning system is specifically designed for all physically handicapped students. Its web-based multimedia system comprises a video conference and online voice-to-text system. It is speculated that the U-Learning environment designed to support both handicapped and non-handicapped students in collaboration with multimedia systems further enhances educational performance. This study identifies the infrastructure required to implement the U-Learning system including educational materials, contents and communication facilities followed by the description of E-learning For All Student System (EFASS) upon its completion, as well as the analytical results of this system.
조재억(Jaeeock Cho),양병기(Byungki Yang),이홍구(Honggu Lee),현덕환(Deochwan Hyun),정우원(Woowon Jung),이대종(Daejong Lee),홍근기(Keunkee Hong),이성은(Seong-Eun Lee),홍정의(Jeongeui Hong) 한국태양광발전학회 2013 Current Photovoltaic Research Vol.1 No.1
In contrast to conventional crystalline cells, back-contact solar cells feature high efficiencies, simpler module assembly, and better aesthetics. The highest commercialized cell and module efficiency was recorded by n-type back-contact solar cells. However, the mainstream PV industry uses a p?type substrate instead of n-type due to the high costs and complexity of the manufacturing processes in the case of the latter. P-type back-contact solar cells such as metal wrap?through and emitter wrap-through, which are inexpensive and compatible with the current PV industry, have consequently been developed. In this paper the characteristics of EWT (emitter wrapthrough) solar cells and their status and prospects for development are discussed.
Jang, Jeongin,Ryu, Byungki,Joo, Sung-Jae,Kim, Bong-Seo,Min, Bok-Ki,Lee, Hee-Woong,Park, Su-Dong,Lee, Ho Seong,Lee, Ji Eun Elsevier 2018 Journal of Alloys and Compounds Vol.739 No.-
<P><B>Abstract</B></P> <P>In order to achieve enhancements in thermoelectric efficiency, microstructures that can form numerous interfaces have been investigated intensively for controlling the transport of charge carriers and heat-carrying phonons. In this paper, we report the heterogeneous microstructure of Mg<SUB>2</SUB>Si<SUB>0.6</SUB>Sn<SUB>0.4</SUB> thermoelectric materials synthesized by a simple B<SUB>2</SUB>O<SUB>3</SUB> encapsulation method and investigation of its influence on thermoelectric properties. The addition of Sb causes the evolution of a Sn-rich secondary phase and a heterogeneous microstructure consisting of Sn-deficient grains and a Sn-rich boundary phase, with coherent interfaces between them. The secondary phase induced by Sb doping suppressed the bipolar effect and reduced the thermal conductivity because of minority carrier blocking and phonon scattering at phase boundaries. However, high concentration of Sb in Sn-rich phase led to insufficient doping in Si-rich main phase and electron-hole compensation by Mg vacancies, resulting in decrease of the doping efficiency of Sb.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Heterogeneous microstructured Mg<SUB>2</SUB>Si<SUB>0.6</SUB>Sn<SUB>0.4</SUB> was synthesized. </LI> <LI> Antimony doping caused the formation of a Sn-rich grain boundary phase. </LI> <LI> Coherent interfaces were formed between the Si-rich phase and the Sn-rich phase. </LI> <LI> The bipolar effect was suppressed and the thermal conductivity was reduced. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Min Ho,Byeon, Do-Gyun,Rhyee, Jong-Soo,Ryu, Byungki Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.5
<P>We investigated the thermoelectric properties and electronic band structure calculation of Sn1−xAgxTe and Sn1.03−xAgxTe (<I>x</I> = 1, 3, 5, 7 mol%) compounds. From the formation energy calculation, the Sn vacancy by Ag doping gives rise to the increase of carrier density as well as the decrease of lattice parameters. There are several possibilities of polar point defects and various neutral Ag complex defects (linear, orthogonal, square type defects <I>etc.</I>) which compensate the increase of charge carriers. The carrier scattering by Ag-related complex defects reduces Hall mobility, resulting in the decrease of electrical conductivity in spite of the increase of Hall carrier density by Ag doping. We do not observe any resonant level formation from the electronic band structure calculation. The change of the scattering exponent by an Ag complex defect (AgSn-AgTe-AgSn) may be associated with the increase of the Seebeck coefficient. Even if the defect scattering reduces electrical conductivity, the increase of the Seebeck coefficient and reduction of lattice thermal conductivity by Ag complex defects result in the enhancement of <I>ZT</I> value 0.62 at 800 K for the Sn-excess Sn0.96Ag0.07Te compound. It indicates that the Sn vacancy and Ag complex defects are associated with the enhancement of thermoelectric figure-of-merit in SnTe based compounds.</P>
李炳基 全北大學校 1970 論文集 Vol.12 No.-
1. Pollen tube의 伸長은 3∼4시간 후에 일어난다. 2. 生殖核은 花粉管으로 移動된 후 Prophase狀態로 오래 持續된다. 3. 核分裂 中期의 其間은 대단히 짧다. 4. Cytokinesis는 Constriction에 의한다. 5. Spermatogenesis時의 Spindle 및 Cytoplasm은 없다. 6. Tclophase의 期間은 길며 觀察도 容易하다. 7. 花粉管의 先端은 20시간이 지나면 破裂되는 것이 많다. Present study was attempted in order to make clear the controversial problems on the metaphase plate and spindle formation in the generative nuclear division, cell plate or furrow formation in the cytokinesis. and Cytoplasmic sheath in the resulted male gamete. 1. Pollen tube begins to grow after 3 hours. 2. Generative nucleus continues prophase in the pollen tube. 3. Duration of the metaphase is very short. 4. Cytokinesis is a Constriction. 5. Spindle and Cytoplasm are not found. 6. Duration of the telophase is long. 7. Many of the pollen tube are degenerated after 20 hous.
李炳基 全北大學校 1970 論文集 Vol.12 No.-
1. 減數分裂은 規則的이다. 2. 四分子는 Tetrahedral이다. 3. 核分裂은 不規則하다. 4. 核分裂은 開葯 2∼3일 전에 끝난다. 5. 生殖核은 작다. 1. Meiosis is normal. 2. Tetrad is tetrahedral. 3. Nuclear division is irregular. 4. Nuclear division is finished 2-3 days before open anther. 5. Generative nucleus is small.