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With the degradation of electrical connector performance, the intermittent failure (IF) may occur in connector when subject to vibration, thermal and humidity stress. Intermittent failure is generally a precursor to a permanent fault (PF). During the whole life cycle of the electrical connector. The dynamic parameters such as frequency and duration of intermittent failure, evolve continuously with...
Higher spectrum efficiency is a target of the 5th generation (5G) mobile communications system. Massive MIMO is considered as one of important technologies for that purpose. Under the practical conditions that the number of antennas on user equipment (UE) is limited, multi-user MIMO (MU-MIMO) is a probable use scenario of Massive MIMO. Furthermore, massive connectivity is another important target,...
In today's era of big data, huge amounts of Web contains many important information. From the Web to extract domain-specific term is an indispensable part of the natural language processing Web, and it also plays an important role in the domain ontology study. Chinese text has no evident difference between words, therefore the present stage in Web text extraction is difficult in the field of Chinese...
Tomlinson-Harashima precoding (THP), as a suboptimal realization of dirty paper coding, has attracted extensive attentions in recent years. However, in numerous studies, only a few of them considered the limitations and restrictions in reality. In this paper, we first point out three main limitations and restrictions of THP when implementing it in the framework of a real industrial system, i.e., the...
In this paper, the work demands of the dispatchers in centralized centers were investigated. The factors contributing to the work demands were defined preliminarily by specialist workshops and were determined using a series of methods in a field study. The results of our investigation indicate that the total number of trains and frequency of communication are major roles in the total work demands...
In this paper, a fast image encryption and authentication scheme is presented. In the proposed scheme, a 512-bit message authentication code generated by a keyed hash function is embedded into the image by reversible data embedding technique. Then the embedded image is masked by the pseudo random sequence in feedback mode. The embedded message authentication code not only plays the role of authentication...
TV white space (TVWS) has been considered a favorable spectrum for sharing with other spectrum deficient technologies. There are three popular TV standards in China: the Digital Terrestrial Multimedia Broadcast (DTMB), China Multimedia Mobile Broadcasting (CMMB) and PAL-D/K (Phase Alternating Line -D/K). In this paper we present a prototype platform for experimental spectrum sensing, which is developed...
In order to correctly recognize the current state of equipment for preventing equipment farther degradation and occurrence of failure, a new method of equipment degradation state recognition based on wavelet correlation feature scale entropy(WCFSE) and hidden semi-Markov models (HSMM ) was proposed. Firstly, the gathered vibration signal of equipment was processed by the way of the wavelet transform...
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