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| 1 | Research and practice on system engineering management of a mobile payment project显示文摘The popularization of the mobile internet has given rise to demand for flexible and convenient payment methods. For China, it is necessary to keep pace with or even lead the trend of innovation and development in the age of mobile payment. From the perspective of systems engineering, this paper introduces research and implementation of China Union Pay's mobile payment project. The general requirements and core engineering problems of the mobile payment project are summarized based on analyses of the characteristics and engineering difficulties of this project. Integration of innovative technologies is introduced to resolve the contradiction between ease-of-use and security. A rapid iterative development process is adopted to improve the product release efficiency as well as the users' experience. The launch of the mobile payment project also opens the window to coordinating and upgrading the whole payment industry chains. | Yongkai ZHOU Hongfeng CHAI | 2017 | Frontiers of Engineering Management2017，4，2： | 1 |
| 2 | Metal oxide semiconductor gas sensing materials for early lung cancer diagnosis显示文摘The urgency of early lung cancer(LC)diagnosis and treatment has been more and more significant.Exhaled breath analysis using gas sensors is a promising way to find out if someone has LC due to its low-cost,non-invasive,and real-time monitoring compared with traditional invasive diagnostic techniques.Among sensor-based gas detection techniques,metal oxide semiconductor’s gas sensors are one of the most important types.This review presents the-state-of-art in metal oxide gas sensors for the diagnosis of early LC.First,the exhaled breath biomarkers are described with emphasis on the concentration of abnormal volatile organic compounds(VOCs)caused by the metabolic process of LC cells.Then,the research status of metal oxide gas sensors in LC diagnosis is summarized.The sensing performance and enhancement strategy of biomarkers provided by metal oxide semiconductor materials are reviewed.Another effective way to improve VOC detection performance is to build a gas sensor array.At the same time,various gas sensors combined with self-powered techniques are mentioned to display a broad development prospect in breath diagnosis.Finally,metal oxide gas sensor-based LC diagnosis is prospected. | Xiaoxi HE Hongfeng CHAI Yifan LUO Lingfeng MIN Marc DEBLIQUY Chao ZHANG | 2023 | Journal of Advanced Ceramics2023，12，2： | 0 |
| 3 | Special issue:Blockchain technology application显示文摘As a game-changer,the emergence of blockchain technology is profoundly shaping the business,organization,economy,and society around the world.The blockchain is an open,distributed ledger that records transactions between two parties efficiently and in a verifiable and permanent way.It exhibits a chain structure composed of increasing blocks.The transaction data per unit time is encrypted into the block for that time period and used to generate a cryptographic hash of the next block.Underlying the novel technology,there are several distinguished features including distributed database,peer-to-peer transmission,transparency with pseudonymity,irreversibility of records,and computational logic.With blockchain,a new world could be imaged in which all form of transactions are embedded in digital code and protected from deletion,tampering and revision.The trust could be perfectly established by using the“algorithmic proof mechanism”in an asymmetric,uncertain,and insecure environment. | Hongfeng CHAI Xiaohong CHEN Hongwei WANG | 2020 | Frontiers of Engineering Management2020，7，4： | 0 |
| 4 | Design of a digital currency information system based on the UnionPay network显示文摘Digital currency can reduce the issuance and circulation costs of physical cash and improve the convenience and transparency of economic activities.Therefore,digital currency has received widespread attention from central banks in recent years.As an important financial infrastructure,the UnionPay network is expected to provide effective support for the construction and operation of a digital currency system.This study uses the UnionPay network as basis to systematically propose a digital currency information system from three aspects,namely,digital currency account opening,exchange,and use,and further expounds on the operation mechanism of a digital currency information system prototype.This study also discusses how to apply blockchain technology to digital currency,such as using distributed ledger for digital currency confirmation and registration and using blockchain-enabled smart contracts to realize the forward guidance function of the central bank digital currency.Lastly,the current research introduces the value of using the UnionPay network to support the operation of a digital currency information system and its technical challenges,aiming to provide beneficial guidance and reference for future research effort. | Hongfeng CHAI Quan SUN Yu ZHOU Tao ZHU | 2020 | Frontiers of Engineering Management2020，7，4： | 0 |
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