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Capturing Software Requirements Modeling from Ontology Tree
Yaqing Liu,Jinghuan Guo,Yong Liu 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.11
Requirements modeling is an important activity in software engineering and is more basic than other activities. But for scale domain, Requirements modeling usually suffers from limited knowledge of developers. In order to get a complete requirements model, software engineers have used domain ontology to capture requirements. However, previous approaches only can automatically capture requirements and the final software system is difficult to maintain. In this paper, we decompose old domain ontology into some sub ontologies and organize them into a tree model, which is called as Ontology Tree. Accordingly, we generate requirements model from Ontology Tree rather than old ontology. From real application, our approach shows a better development and maintainability of software.
The effect of the HRB linker of Newcastle disease virus fusion protein on the fusogenic activity
Liu Yaqing,Liu Ying,Huang Yanan,Wen Hongling,Zhao Li,Song Yanyan,Wang Zhiyu 한국미생물학회 2021 The journal of microbiology Vol.59 No.5
Newcastle disease, designated a class A disease of poultry by the Office international des epizooties (OIE), is an acute infection caused by Newcastle disease virus (NDV). The merging of the envelope of NDV with the membrane of a target host cell is the key step in the infection pathway, which is driven by the concerted action of two glycoproteins: haemagglutinin- neuraminidase (HN) and fusion (F) protein. When the HN protein binds to the host cell surface receptor, the F protein is activated to mediate fusion. The three-dimensional structure of the F protein has been reported to have low electron density between the DIII domain and the HRB domain, and this electron-poor region is defined as the HRB linker. To clarify the contributing role of the HRB linker in the NDV F protein-mediated fusion process, 6 single amino acid mutants were obtained by site-directed mutagenesis of the HRB linker. The expression of the mutants and their abilities to mediate fusion were analysed, and the key amino acids in the HRB linker were identified as L436, E439, I450, and S453, as they can modulate the fusion ability or expression of the active form to a certain extent. The data shed light on the crucial role of the F protein HRB linker in the acquisition of a normal fusogenic phenotype.
MOPSO-based Data Scheduling Scheme for P2P Streaming Systems
( Pingshan Liu ),( Yaqing Fan ),( Xiaoyi Xiong ),( Yimin Wen ),( Dianjie Lu ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.10
In the Peer-to-Peer (P2P) streaming systems, peers randomly form a network overlay to share video resources with a data scheduling scheme. A data scheduling scheme can have a great impact on system performance, which should achieve two optimal objectives at the same time ideally. The two optimization objectives are to improve the perceived video quality and maximize the network throughput, respectively. Maximizing network throughput means improving the utilization of peer’s upload bandwidth. However, maximizing network throughput will result in a reduction in the perceived video quality, and vice versa. Therefore, to achieve the above two objects simultaneously, we proposed a new data scheduling scheme based on multi-objective particle swarm optimization data scheduling scheme, called MOPSO-DS scheme. To design the MOPSO-DS scheme, we first formulated the data scheduling optimization problem as a multi-objective optimization problem. Then, a multi-objective particle swarm optimization algorithm is proposed by encoding the neighbors of peers as the position vector of the particles. Through extensive simulations, we demonstrated the MOPSO-DS scheme could improve the system performance effectively.
Synthesis and Characterization of Hollow Silver Spheres at Room Temperature
Huiyu Chen,Yaqing Liu,Guizhe Zhao 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.2
Hollow silver spheres were synthesized at room temperature using sodium borohydride (NaBH4) as the reducing reagent and poly (vinyl pyrrolidone) (PVP) as the surfactant. The size of the synthesized hollow spheres ranged from 120 to 250 nm, and the surface was composed of many smaller silver nanoparticles. The asobtained product was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-vis absorption spectra. The amount of PVP had a significant effect on the morphology of the resultant silver samples. With an increasing concentration of PVP, the silver products possessed rod-like and shuttle-like shapes. The UV-vis spectrum demonstrated that the broad absorption peak centered at 417 nm resulted from the surface plasmon resonance (SPR) excitation of silver.
Highly flame-retarding cotton fabrics with a novel phosphorus/nitrogen intumescent flame retardant
Peihua Zhao,Yaqing Liu,Xinhang Li,Mei Zhang,Shengnan Liu,Wenjun Liang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
A novel phosphorus/nitrogen intumescent flame retardant, namely 6-chloro-4-(diethylamino phosphoratephosphoryl chloride)-2-(sodium 4-aminobenzensulfonate)-1,3,5-triazine (APPCABT), has been synthesized and charac-terized by elemental analysis, FT-IR,1H-NMR and31P{H}-NMR spectroscopies. To investigate the flame-retardingproperties of the treated cotton fabrics, APPCABT was applied to the chemical treatment of the cotton fabrics surface. The flame-retarding performance of the treated samples with APPCABT was evaluated by limiting oxygen index (LOI). The thermal degradation behavior of the treated samples was studied using thermogravimetric analysis (TGA). Thesurface morphology of the treated samples was observed by scanning electron microscopy (SEM). These results showthat APPCABT is both an intumescent flame retardant with high efficiency and an excellent char-forming agent forthe flame-retarding treatment of cotton fabrics.
Formation of Flower-Like Magnesium Hydroxide Microstructure via a Solvothermal Process
Huiyu Chen,Chunju Xu,Yaqing Liu,Guizhe Zhao 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.5
Flower-like magnesium hydroxide (Mg(OH)2) microstructure composed of many sheet-like nanopetals was prepared on a large scale via a solvothermal reaction at 200°C for 24 h. Water and ethanol mixed solution was employed as solvent and no additional surfactant was involved during the synthetic process. The Mg(OH)2microflowers were characterized by XRD, SEM, HRTEM, and UV-vis techniques. The average size of single flower is about 2 μm and the thickness of the petals ranges from 20 to 30 nm. The temperature and volume ratio of water to ethanol were found to be key roles for controlling the morphology of Mg(OH)2 products. The assembled petals of the Mg(OH)2 microflowers became thicker and smoother with the amount of water decreased in the mixed solvent. The present method is low cost, simple handle and environmentally benign,thus, it can be relatively easy to be scaled up for industrial production.
Green Synthesis and Characterization of Se Nanoparticles and Nanorods
Huiyu Chen,Ji-Beom Yoo,Yaqing Liu,Guizhe Zhao 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.4
Selenium nanoparticles and nanorods were successfully prepared in a mixed solvent of ethylene glycol and water at a relatively low temperature of 85°C. No other surfactant or template was employed, and glucose was used as a green and mild reducing reagent in the current synthesis. The volume ratio of ethylene glycol to water played an important role for controlling the shapes of selenium products. The obtained selenium samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectra, and UV-vis absorption spectra. The evolution process from amorphous selenium to a trigonal phase complied with a “solid-solution-solid” formation mechanism. HRTEM and SAED results indicate that the trigonal selenium nanorods grow along the [001] direction. This method might provide an environmentally-friendly and low cost route for the synthesis of other related nanomaterials with controlled morphologies.