Enhanced photocatalytic oxidation of humic acids using Fe<SUP>3+</SUP>-Zn<SUP>2+</SUP> co-doped TiO₂

Rongfang Yuan,Dan Liu,Shaona Wang,Beihai Zhou,Fangshu Ma 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.2

Photocatalytic oxidation in the presence of Fe-doped, Zn-doped or Fe-Zn co-doped TiO₂ was used to effectively decompose humic acids(HAs) in water. The highest HAs removal efficiency (65.7%) was achieved in the presence of 500°C calcined 0.0010% Fe-Zn co-doped TiO₂ with the Fe:Zn ratio of 3:2. The initial solution pH value, inorganic cations and anions also affected the catalyst photocatalytic ability. The HAs removal for the initial pH of 2 was the highest, and for the pH of 6 was the lowest. The photocatalytic oxidation of HAs was enhanced with the increase of the Ca<SUP>2+</SUP> or Mg2+ concentration, and reduced when concentrations of some anions increased. The inhibition order of the anions on TiO₂ photocatalytic activities was CO₃<SUP>2-</SUP> > HCO₃<SUP>-</SUP> > Cl-, but a slightly promotion was achieved when SO₄<SUP>2-</SUP> was added. Total organic carbon (TOC) removal was used to evaluate the actual HAs mineralization degree caused by the 500°C calcined 0.0010% Fe-Zn (3:2) co-doped TiO₂. For tap water added with HAs, the UV254 and TOC removal rates were 57.2% and 49.9%, respectively. The UV254 removal efficiency was higher than that of TOC because of the generation of intermediates that could significantly reduce the UV254, but not the TOC.

영화에서 표현된 색채의 특성과 내러티브의 연관성에 관한 분석

장룽팡(Zhang, Rongfang),두이천(Du, Yichen),최동혁(Choi, Donghyuk) 한국색채학회 2017 한국색채학회 논문집 Vol.31 No.4

Since the first appearance of color film in the late nineteenth Century, the amount of information carried by color films has been increasing day by day, and color has gradually become part of the basic concept of the film. Numerous film researchers and psychologists have added a variety of definitions of colors which have become an indispensable expression of the film. When watching movies, viewers will be affected by changes in lightness and chroma of color in different scenarios. The right use of color can arouse various associations of human life experiences, and certain colors have certain symbolic meanings. The purpose of this thesis is to understand the symbolism and character of color in the film and its relevance to the plot. And to study the implication of colors in human senses and the effect in the film arts. In this connection, the thesis analyzes the symbolic meaning of color in film, and scenarios directed by David Lynch as the research object, analyzes the effect of various colors’lightness and chroma on colors’symbolic value and the correlation between the performance of the color and the relevance of the story. Through these analyses, it can be found that, in David Lynch"s films, lightness and chroma are closely related to the plot of the movie Therefore, we can see that the color is indeed symbolic and has an impact on the film plot.

Clustering Based Adaptive Power Control for Interference Mitigation in Two-Tier Femtocell Networks

( Hong Wang ),( Rongfang Song ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.4

Two-tier femtocell networks, consisting of a conventional cellular network underlaid with femtocell hotspots, play an important role in the indoor coverage and capacity of cellular networks. However, the cross- and co-tier interference will cause an unacceptable quality of service (QoS) for users with universal frequency reuse. In this paper, we propose a novel downlink interference mitigation strategy for spectrum-shared two-tier femtocell networks. The proposed solution is composed of three parts. The first is femtocells clustering, which maximizes the distance between femtocells using the same slot resource to mitigate co-tier interference. The second is to assign macrocell users (MUEs) to clusters by max-min criterion, by which each MUE can avoid using the same resource as the nearest femtocell. The third is a novel adaptive power control scheme with femtocells downlink transmit power adjusted adaptively based on the signal to interference plus noise ratio (SINR) level of neighboring users. Simulation results show that the proposed scheme can effectively increase the successful transmission ratio and ergodic capacity of femtocells, while guaranteeing QoS of the macrocell.

Recent progress (2015e2020) in the investigation of the pharmacological effects and mechanisms of ginsenoside Rb₁, a main active ingredient in Panax ginseng Meyer

Zuan Lin,Rongfang Xie,Chenhui Zhong,Jianyong Huang,Peiying Shi,Hong Yao 고려인삼학회 2022 Journal of Ginseng Research Vol.46 No.1

Ginsenoside Rb1 (Rb1), one of the most important ingredients in Panax ginseng Meyer, has been confirmed to have favorable activities, including reducing antioxidative stress, inhibiting inflammation, regulating cell autophagy and apoptosis, affecting sugar and lipid metabolism, and regulating various cytokines. This study reviewed the recent progress on the pharmacological effects and mechanisms of Rb1 against cardiovascular and nervous system diseases, diabetes, and their complications, especially those related to neurodegenerative diseases, myocardial ischemia, hypoxia injury, and traumatic brain injury. This review retrieved articles from PubMed and Web of Science that were published from 2015 to 2020. The molecular targets or pathways of the effects of Rb1 on these diseases are referring to HMGB1, GLUT4, 11b-HSD1, ERK, Akt, Notch, NF-kB, MAPK, PPAR-g, TGF-b1/Smad pathway, PI3K/mTOR pathway, Nrf2/HO-1 pathway, Nrf2/ARE pathway, and MAPK/NF-kB pathway. The potential effects of Rb1 and its possible mechanisms against diseases were further predicted via Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway and disease ontology semantic and enrichment (DOSE) analyses with the reported targets. This study provides insights into the therapeutic effects of Rb1 and its mechanisms against diseases, which is expected to help in promoting the drug development of Rb1 and its clinical applications.

Novel schemes of CQI Feedback Compression based on Compressive Sensing for Adaptive OFDM Transmission

( Yongjie Li ),( Rongfang Song ) 한국인터넷정보학회 2011 KSII Transactions on Internet and Information Syst Vol.5 No.4

In multi-user wireless communication systems, adaptive modulation and scheduling are promising techniques for increasing the system throughput. However, a mass of wireless recourse will be occupied and spectrum efficiency will be decreased to feedback channel quality indication (CQI) of all users in every subcarrier or chunk for adaptive orthogonal frequency division multiplexing (OFDM) systems. Thus numerous limited feedback schemes are proposed to reduce the system overhead. The recently proposed compressive sensing (CS) theory provides a new framework to jointly measure and compress signals that allows less sampling and storage resources than traditional approaches based on Nyquist sampling. In this paper, we proposed two novel CQI feedback schemes based on general CS and subspace CS, respectively, both of which could be used in a wireless OFDM system. The feedback rate with subspace CS is greatly decreased by exploiting the subspace information of the underlying signal. Simulation results show the effectiveness of the proposed methods, with the same feedback rate, the throughputs with subspace CS outperform the discrete cosine transform (DCT) based method which is usually employed, and the throughputs with general CS outperform DCT when the feedback rate is larger than 0.13 bits/subcarrier.

MLL4 Regulates the Progression of Non-Small-Cell Lung Cancer by Regulating the PI3K/AKT/SOX2 Axis

Yang Yang,Rongfang Qiu,Qiaoyou Weng,Ziwei Xu,Jingjing Song,Siyu Zhao,Miaomiao Meng,Dengke Zhang,Chunli Kong,Hailin Wang,Min Xu,Zhongwei Zhao,Jiansong Ji 대한암학회 2023 Cancer Research and Treatment Vol.55 No.3

Purpose Mixed-lineage leukemia protein 4 (MLL4/KMT2D) is a histone methyltransferase, and its mutation has been reported to be associated with a poor prognosis in many cancers, including lung cancer. We investigated the function of MLL4 in lung carcinogenesis. Materials and Methods RNA sequencing (RNA-seq) in A549 cells transfected with control siRNA or MLL4 siRNA was performed. Also, we used EdU incorporation assay, colony formation assays, growth curve analysis, transwell invasion assays, immunohistochemical staining, and in vivo bioluminescence assay to investigate the function of MLL4 in lung carcinogenesis. Results We found that MLL4 expression was downregulated in non–small cell lung cancer (NSCLC) tissues compared to adjacent normal tissues and tended to decrease with disease stage progression. We analyzed the transcriptomes in control and MLL4- deficient cells using high-throughput RNA deep sequencing (RNA-seq) and identified a cohort of target genes, such as SOX2, ATF1, FOXP4, PIK3IP1, SIRT4, TENT5B, and LFNG, some of which are related to proliferation and metastasis. Our results showed that low expression of MLL4 promotes NSCLC cell proliferation and metastasis and is required for the maintenance of NSCLC stem cell properties. Conclusion Our findings identify an important role of MLL4 in lung carcinogenesis through transcriptional regulation of PIK3IP1, affecting the PI3K/AKT/SOX2 axis, and suggest that MLL4 could be a potential prognostic indicator and target for NSCLC therapy.

A Receiver-Aided Seamless And Smooth Inter-RAT Handover At Layer-2

( Bin Liu ),( Rongfang Song ),( Haifeng Hu ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.10

The future mobile networks consist of hyper-dense heterogeneous and small cell networks of same or different radio access technologies (RAT). Integrating mobile networks of different RATs to provide seamless and smooth mobility service will be the target of future mobile converged network. Generally, handover from high-speed networks to low-speed networks faces many challenges from application perspective, such as abrupt bandwidth variation, packet loss, round trip time variation, connection disruption, and transmission blackout. Existing inter-RAT handover solutions cannot solve all the problems at the same time. Based on the high-layer convergence sublayer design, a new receiver-aided soft inter-RAT handover is proposed. This soft handover scheme takes advantage of multihoming ability of multi-mode mobile station (MS) to smooth handover procedure. In addition, handover procedure is seamless and applicable to frequent handover scenarios. The simulation results conducted in UMTS-WiMAX converged network scenario show that: in case of TCP traffics for handover from WiMAX to UMTS, not only handover latency and packet loss are eliminated completely, but also abrupt bandwidth/wireless RTT variation is smoothed. These delightful features make this soft handover scheme be a reasonable candidate of mobility management for future mobile converged networks.

Distributed Compressive Sensing Based Channel Feedback Scheme for Massive Antenna Arrays with Spatial Correlation

( Huanqin Gao ),( Rongfang Song ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.1

Massive antenna array is an attractive candidate technique for future broadband wireless communications to acquire high spectrum and energy efficiency. However, such benefits can be realized only when proper channel information is available at the transmitter. Since the amount of the channel information required by the transmitter is large for massive antennas, the feedback is burdensome in practice, especially for frequency division duplex (FDD) systems, and needs normally to be reduced. In this paper a novel channel feedback reduction scheme based on the theory of distributed compressive sensing (DCS) is proposed to apply to massive antenna arrays with spatial correlation, which brings substantially reduced feedback load. Simulation results prove that the novel scheme is better than the channel feedback technique based on traditional compressive sensing (CS) in the aspects of mean square error (MSE), cumulative distributed function (CDF) performance and feedback resources saving.

A SINGLE-CHIP-MICROPROCESSOR CONTROLLED PHOTOVOLTAIC AC SUBMERSIBLE SCREW WATER PUMP SYSTEM

Dehong Xu,Rongfang Cai,Jianlong Shao 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10

An 1 KWp photovoltaic AC water pump system controlled by a single chip microproces­sor is presented. A submersible screw electric pump is drived by a PWM MOSFET inverter. The PWM control pulse for the inverter is generated by an IC HEF4752. Since the screw pump has constant torque property, a simpler maximum power tracking method without the need of a DC-DC converter, which is called Maximum Frequency Point Tracking(MFPT), is presented, which simplifies the control complexity.

Nanomultilayer Silicon film Solar Cell

Lishi Wen,Rongfang Huang 한국표면공학회 2008 한국표면공학회 학술발표회 초록집 Vol.2008 No.-