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In cloud computing environments, resources stored on the cloud servers are transmitted in the form of data flow to the clients via networks. Due to the real-time and ubiquitous requirements of cloud computing services, how to design a sophisticated transmission model to ensure service reliability and security becomes a key problem. In this paper, we first propose a Comprehensive Transmission (CT)...
The reliability of the convertor in double-fed wind power generator set is relatively poor. Once the switch of the convertor fails, the entire wind turbine set may be severely damaged or shut down. As to the issues, an open-circuited fault detection method is proposed on the basis of parameter estimation for the switch of rotor side convertor in double-fed wind power generator set. A whole model is...
Impact behaviors of high-power LED are essential due to the possible poor adhesion of interfaces and should be studied. In this study, the analysis of dynamic response for high-power LED module under impact load is conducted with simplified theoretical analysis, experimental testing and numerical simulation. A self-made microelectronics drop impact tester is established. Then reliability performances...
As the most promising candidate for the realization of high-efficiency light sources for general lighting, the high power lighting emitting diodes(HP-LEDs) still have reliability issues that hinder the large scale application of LED devices. Nowadays, the reliability is becoming an essential barrier for LED devices to substitute the traditional light sources. Failure analysis is one of the key approaches...
In a typical LED package module, a grease layer forms the interface between the substrate and copper heat spreader. We propose to carve grooves on the aluminum substrate to form an array of protruding posts. Three types of grooves are designed to measure interface thermal resistance. A preliminary feasibility study shows obvious improvement in the thermal resistance of the interfaces for the formation...
In this study, reliability performances of high power light emitting diodes module subjected to drop test conditions are evaluated experimentally. Firstly, we have a theoretical analysis of the impact dynamic progress for the LED module. Secondly, a series of impact tests for LED module are also carried out by a self-made microelectronic drop tester. The good reproducibility of dynamic parameters...
Reliability models for various fault tolerant computer architectures are developed. Markov model is very useful calculating with state space by using transition probability and initial value. In practice, sometimes we can not have the exact values of lambda, mu, rho but with some uncertainty about these values. The combination fuzzy logic and Markov model method is introduced and analyzed besides...
A key component of VoIP networks is the SIP signaling infrastructure. The reliance of public SIP servers on the Internet has opened up this critical infrastructure to a range of attacks. In particular, Denial of Service (DoS) attacks pose a serious security threat to the quality, reliability and availability of VoIP operations. In this paper, we investigate the impact of DoS attacks on SIP infrastructure,...
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