Reconfigurable intelligent surface (RIS) has been proved effective in improving the performance of communications. In this letter, effect RIS on individual links ambient backscatter communications is examined. The average bit error rate derived for cases when source-to-reader (S-R) link, source-to-tag (S-T) or both S-R and S-T use to enhance their links. Numerical results show that generally sp...

Discussions of interaction in second language performance assessment have generally been loosely psychological in orientation, forming part of attempts to model the nature of communicative ability within the individual But in investigating the validity of performance assessments involving interactions between individuals (for example between candidate and interlocutor m speaking assessments), t...

Generally speaking, ‘almost distance-regular’ graphs share some, but not necessarily all, of the regularity properties that characterize distance-regular graphs. In this paper we propose two new dual concepts of almost distance-regularity, thus giving a better understanding of the properties of distance-regular graphs. More precisely, we characterize m-partially distance-regular graphs and j-pu...

Outsourcing data in the cloud has become nowadays very common. Since – generally speaking – cloud data storage and management providers cannot be fully trusted, mechanisms providing the confidentiality of the stored data are necessary. A possible solution is to encrypt all the data, but – of course – this poses serious problems about the effective usefulness of the stored data. In this work, we...

all humans experience anxiety in your life and it is natural that people get anxious when facing stressful situations threatening, but severe and chronic anxiety in the absence of clear cause, is uncommon. studies show that anxiety in men and a young person are less privileged economic classes and in women, low-income people and the elderly and children and teenagers are more common. when locat...

in spite of all the progress and achievements in the establish meat and development of health services in the world to date there is still a great and urgent need for new system of delivery of health and medical care particularly in developing counties. until now universities and medical institutions have been training high level professional personnel for delivery of hospital based medicaid ca...

Speaking rate is thought to affect the spectral features of vowels. Target-undershoot models of vowel production predict more spectral reduction and coarticulation of vowels in fast-rate speech than in normal-rate speech. To test this prediction, a meaningful Dutch text of about 850 words was read twice by an experienced newscaster, once at a normal speaking rate and once as fast as possible. A...

Rainfall is one of the most important climatic variables in the hydrology cycle. In flood estimation as well as environmental pollution studies in medium to large watersheds not only mus temporal pattern of rainfall t be known, but also the knowledge of its spatial distribution is required. Estimation of daily rainfall distribution without comparison and selection of suitable methods may lead...

Binary information table, multi-valued table and set-valued are three kinds of systems often encountered in processing. For any system, we can induce different granular structures, then construct the corresponding rough set models. Generally speaking, for same models Pawlak set, covering multi-granulation be induced according to rules. These effective tools data mining This paper studies relati...

This paper examines the acoustic characteristics of voiceless sibilant fricatives in English-and Japanese-speaking adults and the acquisition of contrasts involving these sounds in 2- and 3-year-old children. Both English and Japanese have a two-way contrast between an alveolar fricative (/s/), and a postalveolar fricative (/∫/ in English and /ɕ/ in Japanese). Acoustic analysis of the adult pro...