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Muhammad, Hafiz Ali,Lee, Gilbong,Cho, Junhyun,Bhatti, Umair Hassan,Baik, Young-Jin,Lee, Beomjoon Elsevier 2019 Energy conversion and management Vol.195 No.-
<P><B>Abstract</B></P> <P>An innovative CO<SUB>2</SUB> pressurization system combined with supercritical CO<SUB>2</SUB> (sCO<SUB>2</SUB>) open power cycle is proposed in this study. The combined system reduced the power demand associated with CO<SUB>2</SUB> pressurization in the CO<SUB>2</SUB> capture and storage (CCS) process as well as utilized the captured CO<SUB>2</SUB> in a sCO<SUB>2</SUB> power cycle to generate power. As the first step, conventional multi-stage compression was complemented with CO<SUB>2</SUB> liquefaction and pumping to reduce the compression power. Later, a waste heat-powered recuperative sCO<SUB>2</SUB> power cycle was employed to generate additional electric power.</P> <P>The vapor compression cycle (VCC) was first modeled, validated, and explored for CO<SUB>2</SUB> liquefaction and pumping. Refrigerants R717, R134a, R290, and R32 were analyzed as the VCC working fluid. An initial thermodynamic analysis was performed to identify the most influential liquefaction parameters. Then, a genetic algorithm optimization module in MATLAB was used to minimize the overall power consumption in the VCC. The VCC was integrated with a sCO<SUB>2</SUB> cycle to utilize the high pressure CO<SUB>2</SUB>, and after optimizing the VCC, the performance of the sCO<SUB>2</SUB> cycle was evaluated. Results of our study revealed that integrating the sCO<SUB>2</SUB> cycle with a CO<SUB>2</SUB> liquefaction and pumping cycle reduced power consumption by 13.88% compared to conventional multi-stage compression. Finally, sensitivity analysis with respect to the crucial thermodynamic parameter was also performed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An innovative energy efficient CO<SUB>2</SUB> pressurization and utilization system is proposed. </LI> <LI> The proposed design involves a vapor compression cycle for CO<SUB>2</SUB> pressurization. </LI> <LI> sCO<SUB>2</SUB> power cycle is employed to reduce the power requirement for CO<SUB>2</SUB> pressurization. </LI> <LI> The integrated system results in 13.88% reduction of power consumption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A novel person re-identification network to address low-resolution problem in smart city context
Yaqoob Irfan,Hassan Muhammad Umair,Niu Dongmei,Zhao Xiuyang,Hameed Ibrahim A.,Hassan Saeed-Ul 한국통신학회 2023 ICT Express Vol.9 No.5
We argue that accurate person re-identification is a vital problem for urban public monitoring systems in the smart city context. Since images captured from different cameras have arbitrary resolutions resulting in resolution mismatch, this work proposes a model that takes arbitrary images and converts them to a pre-defined fixed resolution. The model then passes the images to a super-resolution network, producing high-resolution images. We employ a feedback network to generate more realistic super-resolution images, which are fed to the re-identification network to acquire a unique descriptor to disclose the person’s identity. We outperformed in all measures against other state-of-the-art methods.
Mubashir Ali Siddiqui,Hassan Ahmed,Muhammad Bilal Javed,Umair Shahid 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1
This study aims to present a parametric analysis of combined use of two surge protection devices in a relatively very long up-pumping water supply pipeline. Transient conditions are induced by sudden pump tripping. The effects of four parameters of hydropneumatic tank, i.e., polytropic exponent, initial air volume, orifice diameter and wave celerity and two parameters of surge tank, i.e., tank volume and tank orifice diameter are investigated on pressure surges. The parameters are optimized to achieve reduced pressure fluctuations throughout the pipe length. A numerical model is developed to perform hydraulic transient analysis in the pipeline system. Governing partial differential equations for unsteady flows are solved by the method of characteristics (MOC) and are subsequently converted into algebraic form using finite difference method. To establish the authenticity of the model, it is experimentally validated by comparing the model results with the experimental results. The validated model is then employed to analyze the effects of various parameters of the two surge protection devices on pressure fluctuations along the pipe length. The results obtained from the study are optimized for safe operation and economic use of the system.