Based on previous experiments for U‐ and Z‐type manifolds, numerical models were established; then, investigations were conducted on the effect of the optimized designs on the flow distribution. An increaser and baffle plates were attached to the distribution header for the U‐ and Z‐type manifolds, respectively, considering various configurations and sizes. The results indicate that an increaser could markedly reduce the non‐uniformity with a simultaneous decrease of the pressure drop, and baffle plates could also drastically improve the flow distribution, but at the cost of a slight pressure drop increase. By comprehensively applying an increaser and baffle plates in the Z‐type manifold, this adverse effect could be eliminated.
Nowadays, smart home technology is still in continuous development; more and more enterprises and organizations began to enter this industry. However, the security problems and the unknown of emerging technologies make that most people are still in the wait-and-see stage for smart home systems. Under the background that many enterprises have different opinions on the security of smart home systems, this study is committed to forming a set of general evaluation standard index system. The main research work of this paper: the influencing factors of smart home system security are analyzed; according to the characteristics of smart home system equipment, the system security is divided into four aspects: control system, communication technology, intelligent products and cloud services; based on the current national standards, combined with the safety standards of various organizations, safety indicators are selected for each aspect. Finally, the established smart home system security evaluation index system enables users to have a set of relatively general evaluation methods among many different standards to compare and consider the current smart home system with various brands. It is helpful for users to try or further understand the smart home industry to promote the development and progress of the smart home industry.
Mobile payment is a very important service in this age of the Internet, but threats from a safety perspective are very serious. Based on the uniqueness of the mobile payment, establishes a hierarchy appraisal target system by improving the AHP method. To better determine the weight that affects the safety risk factors for mobile payment, it adopts a 3-scale method to replace the traditional 9-scale method in the construction of AHP judgment matrix and then compare it with the traditional 9-scale method. The comparison results demonstrate that the improved method does overcome the difficulty of the expert grasping the scale of judgment in the traditional analytic hierarchy process. The evaluation index structure and the adoption of improved AHP method can provide effective security risk assessment for mobile payment, can improve the efficiency and accuracy of mobile payment security risk assessment, and has strong practicality.
Block chain technology has occupied a very important position in today's society. This emerging technology has been successfully explored and developed in many fields and scenarios. However, due to the fact that block chain technology is still in the exploratory stage, there is no rigid specification and index for block chain products, Integrating the research results of block chain technology architecture and security risk assessment, this paper designs a set of evaluation indicators for block chain products. The indicators are divided into six aspects, including P2P network technology evaluation index, distributed ledger technology evaluation index, asymmetric encryption technology evaluation index, smart contract evaluation index, consensus mechanism evaluation index and other security technologies Evaluation indicators, each big evaluation index is subdivided into several more in-depth evaluation indicators, and each of the specific analysis and explanation. Finally, based on the previous analysis and design work, a block chain product evaluation software is developed, which provides users with the function of comprehensive evaluation of block chain products. The design and software implementation of the block chain product evaluation system can effectively improve the efficiency in the development of block chain products and the quality of the products themselves, which is conducive to the further development of the block chain field.
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