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Liu Chang,Jia YongFei,Kong Bei ASCONS 2019 IJASC Vol.1 No.1
Background/Objectives: Internetization at the communication and channel levels impels many companies to make efforts in building themselves as a trading platform, where a huge bulk of buyers and sellers can carry on transactions. Methods/Statistical analysis: In this paper, by summarizing the critical factors of logistics information system (LIS) quality, a theoretical model was established to resolve the factors that influence customer satisfaction. In this process, customer satisfaction theory (CS) is applied to be a moderator. And then based on the PLS structural equation model, an empirical study was conducted. Findings: The results presented that making full use of Internet of things technology to accelerate the process of reengineering and standardization while guaranteeing the information quality to make contribution to the improvement of customer satisfaction. At the meantime, the establishment of service quality evaluation system in the context of Internet of things can help logistics enterprises to improve the service quality, promote the enterprises’ competitiveness, and realize the collaboration management of enterprises’ services. Improvements/Applications: At the meantime, the establishment of service quality evaluation system in the context of Internet of things can help logistics enterprises to improve the service quality, promote the enterprises’ competitiveness, and realize the collaboration management of enterprises’ services.
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Using Casual Loop Diagramming to Explore the Drivers of Web Development
Liu Chang,Seong-Taek Park,Jia Yongfei ASCONS 2018 INTERNATIONAL JOURNAL OF EMERGING MULTIDISCIPLINAR Vol.2 No.3
This paper proposes the basic analytical framework of web development systems from the perspective of system dynamics. Based on the feedback characteristic of web development activities, we analyze the causality in the web development from six aspects including work stress, web development, motivation, developer maintenance, recruitment and outsourcing and create a casual loop diagram of web development. Through system analysis, crucial factors needed for web developers to accomplish web development tasks continuously and stably are illuminated. The results show that external variables such as new recruitment and case outsourcing can have a short-term effect on the system, while internal variables such as work motivation and work stress have a greater influence on web development activities, which will result in a fluctuation of job performance. From the perspective of management, countermeasures are put forward on how to mobilize the enthusiasm and initiative of developers and improve productivity.
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Intelligent On-demand Routing Protocol for Ad Hoc Network
Yongfei Ye,Xinghua Sun,Minghe Liu,Jing Mi,Ting Yan,Lihua Ding 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.5
Ad hoc networks play an important role in mobile communications, and the performance of nodes has asignificant impact on the choice of communication links. To ensure efficient and secure data forwarding anddelivery, an intelligent routing protocol (IAODV) based on learning method is constructed. Five attributes ofnode energy, rate, credit value, computing power and transmission distance are taken as the basis ofsegmentation. By learning the selected samples and calculating the information gain of each attribute, thedecision tree of routing node is constructed, and the rules of routing node selection are determined. IAODValgorithm realizes the adaptive evaluation and classification of network nodes, so as to determine the optimaltransmission path from the source node to the destination node. The simulation results verify the feasibility,effectiveness and security of IAODV.
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Application of Dynamic Regulation to Increase L-Phenylalanine Production in Escherichia coli
( Jie Wu ),( Yongfei Liu ),( Sheng Zhao ),( Jibin Sun ),( Zhaoxia Jin ),( Dawei Zhang ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.6
Current strategies of strain improvement processes are mainly focused on enhancing the synthetic pathways of the products. However, excessive metabolic flux often creates metabolic imbalances, which lead to growth retardation and ultimately limit the yield of the product. To solve this problem, we applied a dynamic regulation strategy to produce L-phenylalanine (LPhe) in Escherichia coli. First, we constructed a series of Phe-induced promoters that exhibited different strengths through modification of the promoter region of tyrP. Then, two engineered promoters were separately introduced into a Phe-producing strain xllp1 to dynamically control the expression level of one pathway enzyme AroK. Batch fermentation results of the strain xllp3 showed that the titer of Phe reached 61.3 g/l at 48 h, representing a titer of 1.36- fold of the strain xllp1 (45.0 g/l). Moreover, the L-Phe yields on glucose of xllp3 (0.22 g/g) were also greatly improved, with an increase of 1.22-fold in comparison with the xllp1 (0.18 g/ g). In summary, we successfully improved the titer of Phe by using dynamic regulation of one key enzyme and this strategy can be applied for improving the performance of strains producing other aromatic amino acids and derived compounds.
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Application of Dynamic Regulation to Increase L-Phenylalanine Production in Escherichia coli
Wu, Jie,Liu, Yongfei,Zhao, Sheng,Sun, Jibin,Jin, Zhaoxia,Zhang, Dawei The Korean Society for Microbiology and Biotechnol 2019 Journal of microbiology and biotechnology Vol.29 No.6
Current strategies of strain improvement processes are mainly focused on enhancing the synthetic pathways of the products. However, excessive metabolic flux often creates metabolic imbalances, which lead to growth retardation and ultimately limit the yield of the product. To solve this problem, we applied a dynamic regulation strategy to produce $\text\tiny{L}$-phenylalanine ($\text\tiny{L}$-Phe) in Escherichia coli. First, we constructed a series of Phe-induced promoters that exhibited different strengths through modification of the promoter region of tyrP. Then, two engineered promoters were separately introduced into a Phe-producing strain xllp1 to dynamically control the expression level of one pathway enzyme AroK. Batch fermentation results of the strain xllp3 showed that the titer of Phe reached 61.3 g/l at 48 h, representing a titer of 1.36-fold of the strain xllp1 (45.0 g/l). Moreover, the $\text\tiny{L}$-Phe yields on glucose of xllp3 (0.22 g/g) were also greatly improved, with an increase of 1.22-fold in comparison with the xllp1 (0.18 g/g). In summary, we successfully improved the titer of Phe by using dynamic regulation of one key enzyme and this strategy can be applied for improving the performance of strains producing other aromatic amino acids and derived compounds.
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Optimized Thermoelectric Properties of AgSbTe2 through Adjustment of Fabrication Parameters
Jian Zhang,Xiaoying Qin,Di Li,송천준,Yongfei Liu,Hongxing Xin,Tianhua Zou,Yuanyue Li 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
AgSbTe2 bulk sample is obtained by hot-pressing under different fabricationparameters, and their thermoelectric properties are investigated in thetemperature range of 300 - 550 K. The highest ZT = 0.86 is achieved at475 K for the sample hot-pressed at 423 K and 500MPa due to the lowerthermal conductivity and higher power factor. The results indicate that theoptimized thermoelectric properties can be obtained for AgSbTe2 compoundat the sintering temperature of 423 K under the pressure of 500 MPa.
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