Research on the correlation of the sudden failure of aircraft with the human-machine-environment has important meaning to know the sudden failure mechanism of aircraft and reduce or eliminate the disaster accidents. I...
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Research on the correlation of the sudden failure of aircraft with the human-machine-environment has important meaning to know the sudden failure mechanism of aircraft and reduce or eliminate the disaster accidents. In this paper, the feature on sudden failure of aircraft, the forming reason of sudden failure, the spreading way of sudden failure and correlation on sudden failure of aircraft with human-machine environment are researched. At the same time, the relationship model on sudden failure of aircraft with human-machine environment is established, and monitoring module on aero engine in-flight shutdown is designed and it is simulated. Results show that sudden failure of aircraft is a synthetic action result on various factors with human-machine-environment, and it has an evolvement process from gradient to catastrophe and from slight to abrupt. If only the evolvement information of sudden failure can be caught in time and the correspondent measure can be adopted, the emergent fault may prevent and disastrous trouble may reduce.
The FPGAs (Field-programmable Gate Array) are popular in hardware designs and even hardware/software co-designs. Due to the advance of manufacturing technologies, leakage power has become an important issue in the des...
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ISBN:
(纸本)9781424475162
The FPGAs (Field-programmable Gate Array) are popular in hardware designs and even hardware/software co-designs. Due to the advance of manufacturing technologies, leakage power has become an important issue in the design of modern FPGAs. In particular, the partially dynamical reconfigurable FPGAs allow the latency between FPGA reconfiguration and task execution for the performance consideration. However, this latency introduces unnecessary leakage power called leakage waste. In this work, we propose a leakage-aware scheduling algorithm to minimize the leakage waste without increasing the schedule length of tasks. In this algorithm, a priority dispatcher with a split-aware placement is proposed to reduce the scheduling complexity with considering the hardware constraints of FPGAs. A series of experiments based on synthetic designs demonstrates that the proposed algorithm could effectively reduce leakage waste with limited sacrifices on the task schedulability.
during the last decades, bone tissue repair and regeneration have been increasing interest in the clinical therapy scientific field, and with the development of materials, biology and tissue engineering, the bone tiss...
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during the last decades, bone tissue repair and regeneration have been increasing interest in the clinical therapy scientific field, and with the development of materials, biology and tissue engineering, the bone tissue engineering has been as an efficient method to treat bone defects. This review summarizes several aspects related to bone tissue engineering for bone repair and regeneration: the biomaterials in the bone tissue engineering, the stem cell behavior in bone tissue engineering, and the development of biomaterials and bone tissue engineering. We also highlight several latest advancements in bone tissue engineering. Finally, a brief summary of the bone tissue engineering challenges in the field are provided with suggestions for future research directions.
Widget is an increasingly popular technology and can be designed to perform various tasks. Easy to develop, easy to deploy, personalized, interactive, and less consumption of flow of mobile widget make it ideal for mo...
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Widget is an increasingly popular technology and can be designed to perform various tasks. Easy to develop, easy to deploy, personalized, interactive, and less consumption of flow of mobile widget make it ideal for mobile Internet. However, cross-platform development of mobile widget is still challenge, and one of the most difficult problems is implementation of cross-platform API. The purpose of this paper is to research APIs of several specific platforms and propose an effective method to achieve cross-platform widget development. The framework of Mobile Widget Portable Development Library is used while developing cross-platform widgets, which offers approaches to meeting the aforementioned challenge.
This paper presents a distributed anonymous authentication scheme for MANET based on the technique of group signature, secret share and zero-knowledge proof. The scheme takes advantage of the distributed certificate m...
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This paper presents a distributed anonymous authentication scheme for MANET based on the technique of group signature, secret share and zero-knowledge proof. The scheme takes advantage of the distributed certificate management to solve the authentication and key management problems of MANET which is lack of fixed infrastructure. Meanwhile, the scheme adopts the efficient group signature presented by Camenisch and Stadler, achieved the anonymity in the process of authentication and public key transmission. In the case of a later dispute, the group manager can reveal the identity of node by opening its signature. Besides anonymity and traceability, the scheme also has the property of unforgeability and robustness.
Face to the unprecedented opportunities and challenges, we must clearly recognize that education does not fully meet our national economic and social development and the requirements of people who need receive a good ...
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Face to the unprecedented opportunities and challenges, we must clearly recognize that education does not fully meet our national economic and social development and the requirements of people who need receive a good education, it is the cornerstone of social progress and improvement, the fundamental way of the comprehensive development promotion. In this paper, based on the review of the National Long-Term Education Reform and Development Plan, profound understanding the great significance of the "National long-term educational reform and Development Plan" is discussed.
The protection of cultural relic site is an essence in modern society. Due to the immovability of the relic museum site, any attempt to exhibit the site will require the underground space to be dug out and recovered t...
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ISBN:
(纸本)9781612844589
The protection of cultural relic site is an essence in modern society. Due to the immovability of the relic museum site, any attempt to exhibit the site will require the underground space to be dug out and recovered to its original appearance. Based on the characteristic of relic museum architecture, by case analyzing of domestic and foreign typical museums, the author explained and suggested the advantage and running pattern of underground space exploration of such relic museum sites.
The Camellia algorithm has four S boxes called as S 1 , S 2 , S 3 and S 4 . Because the S 1 -box is the core of other S boxes, the avalanche property of S boxes can be studied through testing the avalanche property o...
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ISBN:
(纸本)9781457705359
The Camellia algorithm has four S boxes called as S 1 , S 2 , S 3 and S 4 . Because the S 1 -box is the core of other S boxes, the avalanche property of S boxes can be studied through testing the avalanche property of S 1 -box. The test results show that the Camellia S-box basically meet the strict avalanche criterion.
The purpose of this study was to prepare a kind of fully biodegradable nanocomposites for the sports industry. As a completely biological material, This material had not only special properties of nanomaterials, but a...
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The purpose of this study was to prepare a kind of fully biodegradable nanocomposites for the sports industry. As a completely biological material, This material had not only special properties of nanomaterials, but also had the rigidity of cellulose, dimensional stability and fully biodegradable, at the same time, such material could also solve the disposal problem of waste sports equipment. With different mass fraction, cellulose nano whiskers were added to the polylactic acid matrix, and the composites were prepared by solution casting method, then nano-cellulose whiskers / polylactic acid composites were successfully made. Tests were carried out to study the water absorption, degradation and membrane mechanical properties of the composites. Compared with the pure polylactic acid, water absorption and degradation of the composites increased significantly with the mass fraction of nano-cellulose whiskers increasing. Compared with pure PLA film, the tensile strength and elongation at break of composite membranes increased significantly. When the CNW mass fraction was at 5% maximum, the mechanical properties of nanocomposite got its maximum value. By solution casting, Nano-cellulose whiskers and polylactic acid matrix successfully were prepared into nanocomposites, which had excellent mechanical properties and very good performance at biological degradation.
Method of artillery effectiveness valuation was introduced. According to the theory of grey systems, the patterns of alternative schemes are formed with the fourteen performance indices, which reflect the artillery ef...
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Method of artillery effectiveness valuation was introduced. According to the theory of grey systems, the patterns of alternative schemes are formed with the fourteen performance indices, which reflect the artillery effectiveness best, and the standard mode of these index series is derived according to the grey target theory. The weighting of every indices was determined by Shannon information entropy, thereby the calculation formula of approaching degree was updated. The good or bad effectiveness of artillery effectiveness can be distinguished by solving the approaching degree of patterns for their standard ones and making the queue of approaching degrees in the light of their values. It is found from the evaluation of three artilleries of 122mm that the method gives the same conclusion as that from conventional method and. Therefore, the method is proved to be valid.
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