http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Low Complexity Switched Soft Demapper for Rotated QAM Constellations
Tao, Yuting,Kim, Hak-Jin,Jeon, Sungho,Seo, Jong-Soo [Institute of Electrical and Electronics Engineers 2016 IEEE transactions on broadcasting Vol.62 No.3
<P>In the digital video broadcasting-second generation terrestrial standard, the constellation rotation and cyclic Q-delay techniques have been adopted to improve the bit error rate performance in fading channels. However, they would lead to a substantially increased demapping complexity at the receiver. In order to reduce the demapping complexity, we propose a switched soft demapper, where different demapping algorithms with different level of complexities can be selected according to the in-phase (I) and the quadrature (Q) channel fading conditions. A decision block is applied to determine the demapping algorithm. Three kinds of decision criteria are discussed and compared to verify that the decision criterion has an impact on the performance of the soft demapper. In addition, the algorithm that determines the threshold in the decision block is presented. For the rotated 64-QAM, the performance loss of the proposed demapping scheme is proved to be negligible if a suitable threshold is applied, while the demapping complexity is reduced by up to 77% in Rayleigh fading channel without erasures. For the rotated 256-QAM, the complexity is reduced by up to 95% in Rayleigh fading channel without erasures.</P>
Lu, Yuting,Chen, Luyang,Li, Yuze,Xie, Hongde,Cheng, Han,Jin Seo, Hyo Elsevier 2016 Materials letters Vol.164 No.-
<P><B>Abstract</B></P> <P>The work reports the large-scale synthesis and photocatalytic activity of Bi<SUB>23</SUB>V<SUB>4</SUB>O<SUB>44.5</SUB> nanoplates. The structural refinement was conducted in the layered δ-Bi<SUB>2</SUB>O<SUB>3</SUB> based superstructuLre. The detailed surface properties were characterized. Bi<SUB>23</SUB>V<SUB>4</SUB>O<SUB>44.5</SUB> shows efficient absorption in visible region with a band-gap of 2.384eV from the hybridization of Bi-6s and O-2p orbitals. Particularly, Bi<SUB>23</SUB>V<SUB>4</SUB>O<SUB>44.5</SUB> shows an efficient photodegradation for methylene blue (MB). The photocatalysis benefits from the layered B–O structure characteristic and the codoped defects of V<SUP>4+</SUP>/V<SUP>5+</SUP> ions in the lattices. Bi<SUB>23</SUB>V<SUB>4</SUB>O<SUB>44.5</SUB> nanoplates could be a potential photocatalyst.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bi<SUB>23</SUB>V<SUB>4</SUB>O<SUB>44.5</SUB> nanoplates were prepared by the Pechini method. </LI> <LI> It has a narrow band-gap of 2.384eV from hybridization of Bi-6s and O-2p. </LI> <LI> Bi<SUB>23</SUB>V<SUB>4</SUB>O<SUB>44.5</SUB> has photocatalysis report visible-light-irradiation. </LI> <LI> Photocatalysis is due to layered δ-Bi<SUB>2</SUB>O<SUB>3</SUB>-like structure and codoped V<SUP>4+</SUP>/V<SUP>5+</SUP> ions. </LI> </UL> </P>
Manli Li,Enqi Jin,Zhiyong Qiao,Yuting Xiong 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
In order to study the effects of molecular structure of carboxyl-containing vinyl monomers on applicationperformance of feather keratin (FK) graft copolymer for warp sizing, three kinds of carboxyl acids, i.e. acrylic acid (AA),methacrylic acid (MAA), and itaconic acid (IA), were grafted onto molecular chains of FK through initiation of K2S2O8-NaHSO3 redox system. FK-g-PAA, FK-g-PMAA, and FK-g-PIA with similar grafting ratios around 31 % were prepared assizing agents. Major sizing properties of the three grafted keratins were studied in terms of water-solubility, apparentviscosity, contact angles of sizing paste on cotton fibers, mechanical properties of sizing film, and adhesion to fibers. It wasfound that sizing properties of the grafted FK strongly depended on molecular structure of the carboxyl-containing vinylmonomers. In view of overall performance of the grafted keratin sizes, the most appropriate carboxyl-containing vinylmonomer should be AA.
Status and Policies of ICT Integration in Higher Education in Southeast Asian Countries
고장완(Ko, Jang Wan),위옥정(Wei, Yuting),김은진(Kim, Eun Jin) 한국비교교육학회 2020 比較敎育硏究 Vol.30 No.5
[연구목적] 본 연구는 최근 주목을 받고 있는 동남아시아 국가들의 고등교육에서의 ICT 활용과 정책을 살펴보고 관련 쟁점과 도전과제들을 분석하여 고등교육에서의 효과적 ICT 활용 방안을 모색하고자 하였다. 본 연구에서는 특히 아세안 국가이면서 정부차원에서 대학에서의 ICT 활용 시스템 구축에 많은 노력을 기울여 온 말레이시아와 필리핀, 그리고 전반적인 ICT 인프라는 다른 국가들에 비해 상대적으로 부족하지만 최근에 적극적인 노력을 하고 있는 인도네시아를 중심으로 분석하였다. [연구방법] 본 연구는 문헌연구를 중심으로 하였으며, 특히 다양한 정부 보고서 및 발전계획, 정부의 관련 규정, 고등교육기관에서 추진사항을 보고한 대학 보고서, 그리고 관련 컨퍼런스에서 발표한 자료 등을 분석하였다. [연구결과] 본 연구 결과, 연구대상인 말레이시아와 인도네시아, 그리고 필리핀은 고등교육에서의 ICT 활용에 있어서 공통적으로 MOOC를 강조하고 있으며 이러한 특징은 최근의 새로운 경향을 반영한 것으로 보인다. 충분하지 못한 MOOC 인프라와 상대적으로 낮은 수준의 디지털 문해력, 교수와 학생들의 ICT 관련 역량 부족은 세 국가가 공통적으로 겪고 있는 문제점으로 나타났다. [결론] 결론적으로 말레이시아와 인도네시아, 그리고 필리핀은 국가차원에서 ICT 시스템 구축 및 활용에 대한 정부 차원의 노력과 관련 정책을 추진하여 왔으며, 세 국가의 이러한 노력은 앞으로도 지속될 것으로 예상되어 향후 고등교육 발전에 기여할 것으로 보인다. Purposes: The purposes of this study were to examine the current situation of the national policies on ICT for higher education in Southeast Asian countries, especially focusing on Malaysia, Indonesia, and Philippines, to identify the pertinent issues and challenges, and to provide insights for a more effective implementation of ICT into higher education. Methods: Documentary analysis was used in this study. We analyzed official documents including government reports, national strategic plans and government regulations, reports from the HEIs implementing ICT programs, conference proceedings and presentation papers delivered by experts who have been involved in the national initiatives. Results: As a new trend that presents much potential in addressing the various challenges faced by developing countries, MOOC has found its way into all three countries with the involvement of universities in recent years. Insufficient ICT infrastructure, relatively low level of digital literacy and lack of competency and culture in using ICT among instructors and students were identified as some of the common challenges faced by all three countries. Conclusion: The governments in Malaysia, Indonesia and Philippines have shown serious commitment to ICT integration in higher education, and initiated various national educational policies. With the rapid development of new technologies, ICT will continue to have a considerable impact on HEIs in these countries.
Chung, Young Gie,Matoba, Shogo,Liu, Yuting,Eum, Jin Hee,Lu, Falong,Jiang, Wei,Lee, Jeoung Eun,Sepilian, Vicken,Cha, Kwang Yul,Lee, Dong Ryul,Zhang, Yi Elsevier 2015 Cell stem cell Vol.17 No.6
<P><B>Summary</B></P> <P>The extremely low efficiency of human embryonic stem cell (hESC) derivation using somatic cell nuclear transfer (SCNT) limits its potential application. Blastocyst formation from human SCNT embryos occurs at a low rate and with only some oocyte donors. We previously showed in mice that reduction of histone H3 lysine 9 trimethylation (H3K9me3) through ectopic expression of the H3K9me3 demethylase Kdm4d greatly improves SCNT embryo development. Here we show that overexpression of a related H3K9me3 demethylase KDM4A improves human SCNT, and that, as in mice, H3K9me3 in the human somatic cell genome is an SCNT reprogramming barrier. Overexpression of KDM4A significantly improves the blastocyst formation rate in human SCNT embryos by facilitating transcriptional reprogramming, allowing efficient derivation of SCNT-derived ESCs using adult Age-related Macular Degeneration (AMD) patient somatic nuclei donors. This conserved mechanistic insight has potential applications for improving SCNT in a variety of contexts, including regenerative medicine.</P> <P><B>Highlights</B></P> <P> <UL> <LI> H3K9me3 is a barrier for human SCNT reprogramming as in mouse </LI> <LI> Injection of human KDM4A mRNA improves SCNT success in mouse oocytes </LI> <LI> KDM4A also improves human SCNT blastocyst formation and NT-ESC derivation </LI> <LI> H3K9me3 removal facilitates zygotic genome activation in human SCNT embryos </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>