Power allocation for full-duplex NOMA relaying based underlay D2D communications

( Song Li ),( Shuo Li ),( Yanjing Sun ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.1

In this paper, a full-duplex NOMA relaying based underlay device-to-device (D2D) communication scheme is proposed, in which D2D transmitter assists cellular downlink transmission as a full-duplex relay. Specifically, D2D transmitter receives signals from base station and transmits the superposition signals to D2D receiver and cellular user in NOMA scheme simultaneously. Furthermore, we investigate the power allocation under the proposed scheme, aiming to maximize D2D link’s achievable transmit rate under cellular link’s transmit rate constraint and total power constraint. To tackle the power allocation problem, we first propose a power allocation method based on linear fractional programming. In addition, we derive closed-form expressions of the optimal transmit power for base station and D2D transmitter. Simulation results show that the performance of two solutions matches well and the proposed full-duplex NOMA relaying based underlay D2D communication scheme outperforms existing full-duplex relaying based D2D communication scheme.

An Incipient On-Line Anomaly Detection Approach for the Dynamic Rolling Process

Yanjing Ou,Jinwen Hu,Xiang Li,Salah Haridy 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.

Over the past decades, various methods have been developed to analysis and monitor the dynamic metal processes, specially theextensively used cold rolling process. However, some limitation still exists for the traditional data analysis tools to be implementedwell for these processes. For example, the performance of many of the traditional data analysis approaches cannot be guaranteedwhen the distribution assumption is violated. Meanwhile, it is still lack of systematic method to make good use of the huge conditionparameters. In this article we develop a viable on-line anomaly incipient detection technique towards the cold rolling process of steelsheets. Based on the condition-based SPC, the proposed approach can monitor the multi condition parameters as well as thecorresponding output characteristic in a real-time manner simultaneously and efficiently. It provides a framework for statisticalprocess monitoring development under such dynamic manufacturing environment in order to improve the detecting Sensitivity andSpecificity. The real data practical application verifies that this proposed approach can have an excellent performance without thenormal distribution assumption, thus it has great potential to be employed in a large application area.

Study of Virus Propagation Model in Cloud Environment

Tongrang Fan,Yanjing Li,Feng Gao 보안공학연구지원센터 2013 International Journal of Security and Its Applicat Vol.7 No.4

A Medium Access Control Mechanism for Distributed In-band Full-Duplex Wireless Networks

( Haiwei Zuo ),( Yanjing Sun ),( Song Li ),( Qiang Ni ),( Xiaolin Wang ),( Xiaoguang Zhang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.11

In-band full-duplex (IBFD) wireless communication supports symmetric dual transmission between two nodes and asymmetric dual transmission among three nodes, which allows improved throughput for distributed IBFD wireless networks. However, inter-node interference (INI) can affect desired packet reception in the downlink of three-node topology. The current Half-duplex (HD) medium access control (MAC) mechanism RTS/CTS is unable to establish an asymmetric dual link and consequently to suppress INI. In this paper, we propose a medium access control mechanism for use in distributed IBFD wireless networks, FD-DMAC (Full-Duplex Distributed MAC). In this approach, communication nodes only require single channel access to establish symmetric or asymmetric dual link, and we fully consider the two transmission modes of asymmetric dual link. Through FD-DMAC medium access, the neighbors of communication nodes can clearly know network transmission status, which will provide other opportunities of asymmetric IBFD dual communication and solve hidden node problem. Additionally, we leverage FD-DMAC to transmit received power information. This approach can assist communication nodes to adjust transmit powers and suppress INI. Finally, we give a theoretical analysis of network performance using a discrete-time Markov model. The numerical results show that FD-DMAC achieves a significant improvement over RTS/CTS in terms of throughput and delay.

Isolation and Characterization of a Novel Bacterium Burkholderia gladioli Bsp-1 Producing Alkaline Lipase

( Jing Zhu ),( Yanjing Liu ),( Yanqin ),( Lixia Pan ),( Yi Li ),( Geliang ),( Qingyan Wang ) 한국미생물·생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.7

Active lipase-producing bacterium Burkholderia gladioli Bps-1 was rapidly isolated using a modified trypan blue and tetracycline, ampicillin plate. The electro-phoretically pure enzyme was obtained by purification using ethanol precipitation, ion-exchange chromatography, and gel filtration chromatography. The molecular weight was 34.6 kDa and the specific activity was determined to be 443.9 U/mg. The purified lipase showed the highest activity after hydrolysis with p-NPC₁₆ at a pH of 8.5 and 50°C, and the K_m, k_cat, and k_cat/K_m values were 1.05 mM, 292.95 s^-1 and 279 s^-1mM^-1, respectively. The lipase was highly stable at 7.5 ≤ pH ≤ 10.0. K⁺ and Na⁺ exerted activation effects on the lipase which had favorable tolerance to short-chain alcohols with its residual enzyme activity being 110% after being maintained in 30% ethanol for 1 h. The results demonstrated that the lipase produced by the strain B. gladioli Bps-1 has high enzyme activity and is an alkaline lipase. The lipase has promising chemical properties for a range of applications in the food-processing and detergent industries, and has particularly high potential for use in the manufacture of biodiesel.

A Three-way Handshaking Access Mechanism for Point to Multipoint In-band Full-duplex Wireless Networks

( Haiwei Zuo ),( Yanjing Sun ),( Changlin Lin ),( Song Li ),( Hongli Xu ),( Zefu Tan ),( Yanfen Wang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.7

In-band Full-duplex (IBFD) wireless communication allows improved throughput for wireless networks. The current Half-duplex (HD) medium access mechanism Request to Send/Clear to Send (RTS/CTS) has been directly applied to IBFD wireless networks. However, this is only able to support a symmetric dual link, and does not provide the full advantages of IBFD. To increase network throughput in a superior way to the HD mechanism, a novel three-way handshaking access mechanism RTS/SRTS (Second Request to Send)/CTS is proposed for point to multipoint (PMP) IBFD wireless networks, which can support both symmetric dual link and asymmetric dual link communication. In this approach, IBFD wireless communication only requires one channel access for two-way simultaneous packet transmissions. We first describe the RTS/SRTS/CTS mechanism and the symmetric/asymmetric dual link transmission procedure and then provide a theoretical analysis of network throughput and delay using a Markov model. Using simulations, we demonstrate that the RTS/SRTS/CTS access mechanism shows improved performance relative to that of the RTS/CTS HD access mechanism.

Enhanced electrochemical performance of Ca-doped NdBa_1-xCa_xCoCuO_5+δ as cathode material for intermediate-temperature solid oxide fuel cells

Pang, Shengli,Su, Yanjing,Yang, Gongmei,Shen, Xiangqian,Zhu, Meng,Wu, Xiao,Li, Songwei,Yang, Xiaofen,Xi, Xiaoming Elsevier 2018 Ceramics international Vol.44 No.17

<P><B>Abstract</B></P> <P>Exploring advanced cathode materials that have high electrochemical activity and superior thermal compatibility with other components is of great importance for the application of intermediate-temperature solid oxide fuel cells. In the present study, influences of Ca doping on electrochemical and physicochemical properties of NdBa<SUB>1-x</SUB>Ca<SUB>x</SUB>CoCuO<SUB>5+δ</SUB> were studied systematically. A relatively low thermal expansion coefficient (16.8 × 10<SUP>−6</SUP> °C<SUP>−1</SUP>) was obtained for the Ca-doped sample over the temperature range of 25–800 °C. Moreover, Ca doping significantly enhanced the electrochemical performance of NdBa<SUB>1-x</SUB>Ca<SUB>x</SUB>CoCuO<SUB>5+δ</SUB>. The highest densities of power for NdBa<SUB>1-x</SUB>Ca<SUB>x</SUB>CoCuO<SUB>5+δ</SUB>-based single cells at the temperatures of 800 °C increased from 1.42 W cm<SUP>−2</SUP> for x = 0.0 to 1.84 W cm<SUP>−2</SUP> for x = 0.3. This increase in electrochemical performance of NdBa<SUB>1-x</SUB>Ca<SUB>x</SUB>CoCuO<SUB>5+δ</SUB> cathode with Ca doping can be ascribed to enhanced concentrations of oxygen vacancies and higher electrical conductivity.</P>

Computational study on the performance improvement of axial-flow pump by inlet guide vanes at part loads

Fan Yang,Wen-zhu Hu,Chao Li,Chao Liu,Yanjing Su 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.12

In order to investigate the influence of adjustable inlet guide vanes on the hydraulic performance of axial-flow pump and impeller, the axial-flow pump with different inlet guide vane adjustable angles was simulated based on the RNG k-ε turbulent model and Reynolds time-averaged equations. The multivariate non-linear regression prediction model was established about the effect of adjustable inlet guide vane on the hydraulic performance of axial-flow pump based on the numerical simulation. The performance curves of axial-flow pump with different inlet guide vane adjustable angles were obtained by calculation, showing that the performance curve shifts towards larger flow volume in case the guide vanes are turned from positive to negative angle. With the increase of inlet guide vane positive angle, the optimum operating of pump is closer to smaller operating condition, but the hydraulic efficiency of pump is lower. The larger the flow is, the larger the decreasing amplitude of pump efficiency is. With the decreases of inlet guide vane negative angle, the higher hydraulic efficiency of pump increases first then decreases. The inlet guide vane angle affects the axial velocity distribution of the blade trailing edge.

Outcomes of Anti-CD19 CAR-T Treatment of Pediatric B-ALL with Bone Marrow and Extramedullary Relapse

Xinyu Wan,Xiaomin Yang,Fan Yang,Tianyi Wang,Lixia Ding,Lili Song,Yan Miao,Xiang Wang,Yani Ma,Chengjuan Luo,Jingyan Tang,Longjun Gu,Jing Chen,Yanjing Tang,Jun Lu,Benshang Li 대한암학회 2022 Cancer Research and Treatment Vol.54 No.3

PurposeAnti-CD19 chimeric antigen receptor T-cell immunotherapy (19CAR-T) has achieved impressive clinical results in adult and pediatric relapsed/refractory (r/r) B-lineage acute lymphoblastic leukemia (B-ALL). However, the application and effect of CAR-T therapy in B-ALL patients with extramedullary relapse are rarely issued even disqualified in some clinical trials. Here, we examined the efficacy of 19CAR-T in patients with both bone marrow and extramedullary involvement.Materials and MethodsCAR-T cells were generated by transfection of primary human T lymphocytes with a lentiviral vector expressing anti-CD19 single chain antibody fragments (scFvs) with the cytoplasmic domains of 4-1BB and CD3ζ, and used to infuse patients diagnosed as having r/r B-ALL with extramedullary origination. Clinical responses were evaluated by the use of bone marrow aspiration, imaging, and flow cytometry. ResultsEight patients received 19CAR-T infusion and all attained complete remission (CR). Only one patient was bridged to hematopoietic stem cell transplantation (HSCT). Although three patients relapsed after infusion, they received 19/22CAR-T infusion sequentially and attained a second remission. To date, five patients are in continuous CR and all eight patients are still alive. The mean follow-up time was 21.9 months, while the 24-month estimated event-free survival is 51.4%. Conclusion19CAR-T therapy can lead to clinical remission for extramedullary relapsed pediatric B-ALL patients. However, the problem of CD19+ relapses after CAR-T remained to be solved. For patients relapsing after CAR-T, a second CAR-T therapy creates another opportunity for remission for subsequent HSCT.