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THE BRUCK CONJECTURE AND ENTIRE FUNCTIONS SHARING POLYNOMIALS WITH THEIR k-TH DERIVATIVES
Feng Lu,Hongxun Yi 대한수학회 2011 대한수학회지 Vol.48 No.3
The purpose of this paper is twofold. The rst is to establish a uniqueness theorem for entire function sharing two polynomials with its k-th derivative, by using the theory of normal families. Meanwhile, the theorem generalizes some related results of Rubel and Yang and of Li and Yi. Several examples are provided to show the conditions are necessary. The second is to generalize the Bruck conjecture with the idea of sharing polynomial.
THE BRÜCK CONJECTURE AND ENTIRE FUNCTIONS SHARING POLYNOMIALS WITH THEIR κ-TH DERIVATIVES
Lu, Feng,Yi, Hongxun Korean Mathematical Society 2011 대한수학회지 Vol.48 No.3
The purpose of this paper is twofold. The first is to establish a uniqueness theorem for entire function sharing two polynomials with its ${\kappa}$-th derivative, by using the theory of normal families. Meanwhile, the theorem generalizes some related results of Rubel and Yang and of Li and Yi. Several examples are provided to show the conditions are necessary. The second is to generalize the Br$\"{u}$-ck conjecture with the idea of sharing polynomial.
Feng, Yi,Yu, Xin-Yao,Paik, Ungyu The Royal Society of Chemistry 2016 Chemical communications Vol.52 No.8
<P>A template-engaged strategy is used to synthesize nanostructured metal phosphides with different compositions. Among the as-synthesized metal phosphides, nickel cobalt phosphides quasi-hollow nanocubes exhibit the best electrocatalytic activity for hydrogen evolution reaction in terms of lower overpotential and smaller Tafel slope in alkaline solution.</P>
ELSEVIER : Synthesis of novel 5-oxaprotoberberines as bioisosteres of protoberberines
( Yi Feng Jin ),( Daulat Bikram Khadka ),( Su Hui Yang ),( Chao Zhao ),( Won Jea Cho ) 전남대학교 약품개발연구소 2014 약품개발연구지 Vol.23 No.-
5-0xaprotoberberinones and 5-oxaprotoberberinium were synthesized as bioisosteres of protoberberines. 5-0xaprotoberberinones were prepared by linking phenol with the isoquinolone ring of 3-phenoIisoquinoIones by methyleneoxy bridge, while the quaternary 5-oxaprotoberberinium salt was synthesized by reduction and oxidation of the lactam moiety of 5-oxaprotoberberinone. ⓒ 2014 Elsevier Ltd. All rights reserved.
Self-templated Prussian blue analogue for efficient and robust electrochemical water oxidation
Feng, Yi,Han, HyukSu,Kim, Kang Min,Dutta, Soumen,Song, Taeseup Elsevier 2019 Journal of catalysis Vol.369 No.-
<P><B>Abstract</B></P> <P>The development of high-performance and robust catalysts with low-cost is the major demand for electrochemical water oxidation. Here, a unique and facile method is reported for the synthesis of NiFe alloy derived from templated Prussian blue analogues (PBAs) on carbon cloth, exhibiting excellent water oxidation activity and stability in alkaline solution. The best water oxidation activity is obtained with O-NiFe@C-600, in which overpotential of 250 mV is required for generating water oxidation current density of 10 mA cm<SUP>−2</SUP> and overpotential of 300 mV was needed for affording 100 mA cm<SUP>−2</SUP>. In addition, outstanding long-term stability over 25 h in chronoamperometric measurements was achieved for O-NiFe@C-600. The catalysts considerably outperform the activity and stability of the other PBA derived catalysts and even the noble metal catalysts RuO<SUB>2</SUB>. The excellent performance is attributable to unique self-supported structures of the PBA-derived NiFe catalysts on carbon cloth as well as the incorporation of reactive oxygen species (ROS) by <I>in-situ</I> O<SUB>2</SUB> plasma activation which further increases the number of active sites for water oxidation. Additionally, well-defined graphitized cells largely enhances stability of the catalyst by acting as chemical protective layers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiFe alloys derived from Prussian blue analogues (PBAs) were developed as a high-performance electrocatalyst for water oxidation using a facile self-templated synthesis method combined with <I>in-situ</I> O<SUB>2</SUB> plasma activation process (O-NiFe@C). </LI> <LI> O-NiFe@C exhibited substantially low overpotential of 250 and 300 mV for affording water oxidation current densities of 10 and 100 mA cm<SUP>−2</SUP>. </LI> <LI> Excellent long-term stability longer than 24 h was obtained for O-NiFe@C at high current in alkaline media. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Applications of Intelligent Radio Technologies in Unlicensed Cellular Networks - A Survey
( Yi-feng Huang ),( Hsiao-hwa Chen ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.7
Demands for high-speed wireless data services grow rapidly. It is a big challenge to increasing the network capacity operating on licensed spectrum resources. Unlicensed spectrum cellular networks have been proposed as a solution in response to severe spectrum shortage. Licensed Assisted Access (LAA) was standardized by 3GPP, aiming to deliver data services through unlicensed 5 GHz spectrum. Furthermore, the 3GPP proposed 5G New Radio-Unlicensed (NR-U) study item. On the other hand, artificial intelligence (AI) has attracted enormous attention to implement 5G and beyond systems, which is known as Intelligent Radio (IR). To tackle the challenges of unlicensed spectrum networks in 4G/5G/B5G systems, a lot of works have been done, focusing on using Machine Learning (ML) to support resource allocation in LTE-LAA/NR-U and Wi-Fi coexistence environments. Generally speaking, ML techniques are used in IR based on statistical models established for solving specific optimization problems. In this paper, we aim to conduct a comprehensive survey on the recent research efforts related to unlicensed cellular networks and IR technologies, which work jointly to implement 5G and beyond wireless networks. Furthermore, we introduce a positioning assisted LTE-LAA system based on the difference in received signal strength (DRSS) to allocate resources among UEs. We will also discuss some open issues and challenges for future research on the IR applications in unlicensed cellular networks.
Feng Yi Cheo,Celeste Hong Fei Lim,Kai Siang Chan,Vishal Girishchandra Shelat 한국간담췌외과학회 2024 Annals of hepato-biliary-pancreatic surgery Vol.28 No.1
Hepatocellular carcinoma (HCC) is the sixth most diagnosed cancer worldwide. Healthcare resource constraints may predispose treatment delays. We aim to review existing literature on whether delayed treatment results in worse outcomes in HCC. PubMed, Embase, The Cochrane Library, and Scopus were systematically searched from inception till December 2022. Primary outcomes were overall survival (OS) and disease-free survival (DFS). Secondary outcomes included post-treatment mortality, readmission rates, and complications. Fourteen studies with a total of 135,389 patients (delayed n = 25,516, no delay n = 109,873) were included. Age, incidence of male patients, Child–Pugh B cirrhosis, and Barcelona Clinic Liver Cancer Stage 0/A HCC were comparable between delayed and no delay groups. Tumor size was significantly smaller in delayed versus no delay group (mean difference, –0.70 cm; 95% confidence interval [CI]: –1.14, 0.26; p = 0.002). More patients received radiofrequency ablation in delayed versus no delay group (OR, 1.22; 95% CI: 1.16, 1.27; p < 0.0001). OS was comparable between delayed and no delay in HCC treatment (hazard ratio [HR], 1.13; 95% CI: 0.99, 1.29; p = 0.07). Comparable DFS between delayed and no delay groups (HR, 0.99; 95% CI: 0.75, 1.30; p = 0.95) was observed. Subgroup analysis of studies that defined treatment delay as > 90 days showed comparable OS in the delayed group (HR, 1.04; 95% CI: 0.93, 1.16; p = 0.51). OS and DFS for delayed treatment were non-inferior compared to no delay, but might be due to better tumor biology/smaller tumor size in the delayed group.
Yi Feng,Lei Chen,Zhong-Yong Yuan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
The development of efficient electrocatalysts occupies a vital position in achieving efficient energy conversionand storage. Transition-metal-based layered double hydroxides (TM LDHs) featuring unique layeredstructure have received extensive attention in the field of designing highly cost-effectiveelectrocatalysts. Nevertheless, the practical application of TM LDH-based electrocatalysts still faces a seriesof challenges including insufficient active sites, inferior intrinsic conductivity and suboptimal robustness. Throughout this review, the most recent researches dedicated to TM LDH-based electrocatalysts arereviewed in terms of structural features, synthetic strategies, modification approaches and electrocatalyticapplications. This review focuses on the effective modification approaches and important electrochemicalapplications of TM LDHs. This review supplies the conducive tools to select the appropriatetechnics for adequately boosting the electrocatalytic performance of TM LDH-based electrocatalystsand concludes with a salient summary outlining orientations for further research.