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Extended Airtime Fair Scheduling Method for a Zigbee Network
Van-Tu Chau,T.T. Quyen Bui,Anh-Tuan Do,Quang-Vinh Thai 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
In a Zigbee network, when many nodes simultaneously send data packets to a Zigbee coordinator through routes (branches), the Zigbee coordinator cannot deal with all signals. Interference and noises are existed during data transmission. This problem is still one of challenges in the network communication. In this paper, we propose an extended airtime fair algorithm in which throughput of a Zigbee network is maximized and fractions of airtime are taken into account. We adapt a utility function that is proposed by Kelly (1997) in maximizing the network throughput; nevertheless, throughput of each branch is multiplied by a fraction of airtime. Fractions of airtime play a role in creating a balance of throughputs of branches: the throughput and fairness of each branch is guaranteed. Moreover, the usefulness of our proposed algorithm for a Zigbee network is presented; simulation results show that the throughput and fairness are better than those of a case of not using airtime fair.
Compounds from the aerial parts of Piper bavinum and their anti-cholinesterase activity
Hoang Viet Dung,TODAO CUONG,Nguyen Minh Chinh,Do Quyen,김정아,변정수,우미희,Jae Sui Choi,민병선 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.5
A new alkenylphenol, bavinol A (1), togetherwith six known compounds (2–7) were isolated from theaerial parts of Piper bavinum (Piperaceae). The chemicalstructures of these compounds were determined by spectroscopicanalyses including 2D NMR spectroscopy. Theanti-Alzheimer effects of compounds 1–7 were evaluatedfrom acetylcholinesterase (AChE) and butyrylcholinesterase(BChE) inhibitory activity assays. Bavinol A (1),ampelopsin (3), and violanthin (4) exhibited AChE inhibitoryactivities with IC50 values of 29.80, 59.47 and79.80 lM. Compound 1 also showed the most potentBChE inhibitory activity with an IC50 value of 19.25 lM.
Energy storage and generation through desalination using flow-electrodes capacitive deionization
Hyunseung Lim,Yuncheol Ha,Hye Bin Jung,Pil Sung Jo,Hana Yoon,Do Quyen,Namchul Cho,Chung-Yul Yoo,Younghyun Cho 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Flow electrodes-based capacitive deionization (FCDI) is a highly energy-efficient desalination processcompared to conventional processes, including reverse osmosis and multi-stageflash distillation. Furthermore, it provides a continuous desalinationflow with high salt-removal capacity, whereas CDIusingfixed electrodes requires additional electrode rinsing. In FCDI, salt ions are adsorbed ontoflowcarbon electrodes and stored in the electrode slurry container, which is similar to an electrochemicalflowcapacitor. Therefore, stored ions can generate energy during discharging in FCDI operation. In this study,such energy generation was systematically investigated in terms of the various discharging rates, feedconcentrations, and volume offlow-electrode slurry. We found that the results were correlated with thechanges in the salt concentration of the effluentflow. The discharging current of 50 mA showed thehighest capacity for energy generation out of all the experimental conditions; it recovered around 25% ofthe energy consumed during FCDI desalination. We believe that such energy recovery can greatly reducethe energy consumption needed for FCDI desalination. Such recycling of generated energy would makeFCDI more attractive than other conventional desalination techniques.
NGUYEN, Xuan Hung,DANG, Thuy Quynh,DINH, Thi Thao Quyen,DO, Phuong Thanh,PHAM, Thu Uyen,MAI, Duc Duong Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.6
The objective of this article is to assess the impact of corporate social responsibility (CSR) implementation on Corporate Brand Value (CBV) and Corporate Financial Performance (CFP). At the same time, the article examines the mediated role of CBV on the relationship between CSR implementation and CFP. In-depth interviews and observation techniques were used in this article on 4 experts to collect qualitative information. Quantitative analysis was based on primary data obtained from 454 employees working at enterprises providing Bancassurance services. The article uses various models of Cronbach's Alpha coefficient, Exploratory Factor Analysis (EFA), Confirmatory Factor Analysis (CFA), and Structural Equation Analysis (SEM) using SPSS 22.0 and AMOS 20.0 software. In addition, a 5-point Likert scale is used to measure observed variables. Research results show that CBV plays an intermediate role in the relationship between CSR implementation and CFP. At the same time, the implementation of CSR toward communities, customers, and workers directly impacts CBV and CFP. The article draws a new conclusion; there is no relationship found between the implementation of CSR and CFP. The result proposes implications for the state and Bancassurance service providers to develop and implement CSR-related policies and activities to enhance their brand value and financial performance.
Chien Minh Tran,Ngoc Thi‑Thanh Nguyen,Minh Hieu Ho,Vinh Khanh Doan,Khanh Loan Ly,Nhi Ngoc‑Thao Dang,Nam Minh‑Phuong Tran,Hoai Thi‑Thu Nguyen,Long Phuoc Truong,Thai Minh Do,Quyen Ngoc Tran,Hien Quoc Ng 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
In this study, we proposed a straightforward electrospun polycaprolactone (PCL) loaded with silver nanoparticles (SNPs)membrane fabrication process, in which SNPs were directly synthesized from silver nitrate (AgNO3) in PCL–acetone mixtureby gamma irradiation. The insolubility of AgNO3in PCL solution was solved using an auxiliary dimethyl sulfoxide solvent. As a physical approach, gamma rays readily converted silver ions into SNPs without the addition of harmful reductionagents, which reduced the cytotoxicity of the synthesized material. By avoiding some processes such as purification, solventremoval, or redispersion of SNPs, this method was more time-saving compared to other related studies. SNPs formation wasconfirmed by both UV–Visible spectrum (UV–Vis) and X-ray diffraction analysis. Scanning electron microscopy (SEM)revealed that the addition of SNPs significantly reduced the fiber diameter of PCL–Ag membranes compared to that of rawPCL. Uniform spherical-shaped SNPs incorporated in PCL fibers were observed under transmission electron microscopy(TEM). The tensile test showed that the electrospun PCL–Ag membranes exhibited good mechanical characteristics. Moistureeasily penetrated the porous microstructure of PCL–Ag, facilitating wound humidity regulation. Inductively coupledplasma-mass spectroscopy (ICP-MS) was employed to study the release profiles of SNPs at different time intervals. Overall,the PCL–Ag 500 ppm sample exerted excellent antibacterial activity against Pseudomonas aeruginosa and Staphylococcusaureus strains and low in vitro cytotoxicity.