8 research outputs found
A quarter-wave Y-shaped patch antenna with two unequal arms for wideband Ultra High Frequency Radio-frequency identification (UHF RFID) operations
The radio-frequency identification (RFID) system which has become pervasive in the auto identification
technology has been noticed to have several limitations. These limitations can be broadly divided into
two major areas namely; application specific problems and general RFID problems. Application specific
problems are common to the environment in which RFID tags are deployed such as metal, aqueous and
irradiation environments. Whilst, the general problem of RFID tags include low gain, regional
specifications and so on. In this paper, a new antenna prototype has been design and stimulated. The
proposed antenna showed tendency of exhibiting improved gain from the previous RFID UHF antenna
which is 0-1 dBi to -3 dBi and impedance bandwidth of 140 MHz. The proposed antenna is Y shaped
patch with unequal monopole arms which are responsible for the different frequencies that the antenna
operates and a quarter wavelengths was adopted rather than the popular half wavelength for size
reduction. The fractional return-loss bandwidth for S11<10 dB and radiation efficiency are about 95%
was obtained
Sixth Generation (6G)Wireless Networks: Vision, Research Activities, Challenges and Potential Solutions
The standardization activities of the fifth generation communications are clearly over
and deployment has commenced globally. To sustain the competitive edge of wireless networks,
industrial and academia synergy have begun to conceptualize the next generation of wireless
communication systems (namely, sixth generation, (6G)) aimed at laying the foundation for the
stratification of the communication needs of the 2030s. In support of this vision, this study highlights
the most promising lines of research from the recent literature in common directions for the
6G project. Its core contribution involves exploring the critical issues and key potential features of
6G communications, including: (i) vision and key features; (ii) challenges and potential solutions;
and (iii) research activities. These controversial research topics were profoundly examined in relation
to the motivation of their various sub-domains to achieve a precise, concrete, and concise conclusion.
Thus, this article will contribute significantly to opening new horizons for future research direction
Sixth Generation (6G) Wireless Networks: Vision, Research Activities, Challenges and Potential Solutions
The standardization activities of the fifth generation communications are clearly over and deployment has commenced globally. To sustain the competitive edge of wireless networks, industrial and academia synergy have begun to conceptualize the next generation of wireless communication systems (namely, sixth generation, (6G)) aimed at laying the foundation for the stratification of the communication needs of the 2030s. In support of this vision, this study highlights the most promising lines of research from the recent literature in common directions for the 6G project. Its core contribution involves exploring the critical issues and key potential features of 6G communications, including: (i) vision and key features; (ii) challenges and potential solutions; and (iii) research activities. These controversial research topics were profoundly examined in relation to the motivation of their various sub-domains to achieve a precise, concrete, and concise conclusion. Thus, this article will contribute significantly to opening new horizons for future research directions
Echocardiographic Changes in Saudi Patients with Type 2 Diabetes Mellitus
Background and Objectives: Cardiovascular disease is one of the leading causes of morbidity and mortality among the diabetic population. Given the high prevalence of diabetes mellitus (DM) in Saudi Arabia and the high prevalence of heart failure in the diabetic population, this study assesses the echocardiographic changes in Saudi patients with type 2 DM (T2DM) compared with healthy controls. Materials and Methods: In this retrospective caseâcontrol study, 80 patients with diabetes (45 males, age: 58.78 ± 10.2 years) were compared with 80 controls (45 males, age: 58.6 ± 10 years) who underwent an echocardiographic study in the King Saud University Medical City, Riyadh, Saudi Arabia. Results: There were no significant differences between the patients with diabetes and controls in terms of aortic root diameter, left atrium diameter, posterior wall, interventricular wall thickness, left ventricular diameters and ejection fraction. However, diastolic dysfunction was statistically significantly higher in the diabetic group than in the control group (p Conclusions: This is the first caseâcontrol study in Saudi Arabia that assesses echocardiographic parameters in T2DM patients. DM is an independent risk factor for diastolic dysfunction regardless of its association with hypertension and dyslipidemia