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Muhammad Tabish Niaz,Fatima Imdad,Hyung Seok Kim 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Wireless technology is paving its way to the next generation of communication system: 5G. As the radio spectrum is exhausted, the need for the use of free unlicensed frequency band is increasing. One of the possible solutions is to use visible light communication (VLC) for indoor applications. VLC utilizes light emitting diodes (LED) for providing illumination and data communication. Hence for VLC to work for high data rate and mobile applications, there is a need to maintain a steady received optical power distribution (ROPD) over the reference receiving plane. To tackle this issue the placement of LEDs with in the room plays an important part. This paper proposes circular LED deployment technique to improve the ROPD at the receiving plane.
High-Accuracy Positioning in 5G-NR: Is carrier phase the answer?
Muhammad Tabish Niaz,Sunwoo Kim 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
With the constant evolution of 5G new radio (NR), it is anticipated that positioning will be a fundamental feature demanded by most commercial applications. Location based services will demand tighten requirement with respect to positioning accuracy and latency. Recently, carrier phase-based positioning has gained a momentum to be a prime candidate for high-accuracy positioning in 5G-NR future releases. This paper presents a brief insight of the latest discussions and techniques utilizing carrier phase for positioning in future 5G-NR releases.
Performance improvement of double-pass solar air heater – A state of art of review
Alam, Tabish,Kim, Man-Hoe Elsevier 2017 RENEWABLE & SUSTAINABLE ENERGY REVIEWS Vol.79 No.-
<P><B>Abstract</B></P> <P>This paper presents a comprehensive literature review of the various heat transfer techniques used to increase the performance of double-pass solar air heaters (SAHs). The heat transfer from absorber plate to air can be improved by increasing the convective heat transfer coefficient, the heat transfer area and by reducing thermal losses. These methodologies have guided the design and development of double-pass SAHs, and the results of several experimental studies show that double pass SAHs achieve better performance than single-pass SAHs. Literatures on double-pass SAHs have been reviewed to understand the different techniques used for performance improvement. The different operating and system parameters have been categorized to understand their performance behavior. The literature also reveals that numbers of techniques have been employed to improve heat transfer. These techniques include the incorporation of various features into the SAH design, such as extended surfaces, corrugated surfaces, artificial roughness, and packed beds. Furthermore, it is found that packed bed increase the heat transfer rate along with reduction in losses to environment because insolation is absorbed in the depth of packing material cause to lower the top layer temperature and, thereby, improvement in thermal losses.</P>
Muhammad TABISH,Muhammad Adnan BASHIR,Muhammad Mansoor ALAM,Zalizah Awang LONG,Mohd. Khairil RAHMAT 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.3
The purpose of this study is to examine the role of virtual community participation and engagement in the brand decision by building community and brand trust. In this study, two theories (Social Capital Theory and Theory of Collective Action) were tested. Both theories were linked based on existing literature, and empirical evidence was obtained through testing hypotheses. Students from five prestigious Pakistani business schools provided a total of 849 replies. The measurement model and structural model were both analyzed using the partial least square (PLS) method. The findings show that virtual community engagement and participation have a positive and significant impact on virtual community trust. Although virtual community engagement has a positive effect on brand trust, we found no evidence of a link between virtual community participation and brand trust. Later, these trusts positively influence brand choice. This study has several managerial implications. The suggested model of this study helps managers to get customers’ insight, choose the right target market, and set integrated marketing communication strategies besides social media marketing strategies. The study represents a new perspective of consumer behavior that helps to understand how a customer behaves in virtual communities to trust and take the final decision to purchase.
구조물의 동적 거동예측을 위한 다층퍼셉트론 최적화 방법
타비시알리 ( Tabish Ali ),김은주 ( Kim Robin Eunju ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
The use of Artificial Intelligence (AI) to predict the behavior of any system is common these days. Use of the technology may be economical in terms of both time and cost. The database methods are robust and reliable. The current study is about the application of AI for predicting the dynamic responses of steel frame buildings. To obtain an optimized AI method, different multi-layer perceptron were trained and tested by varying the hyperparameters like number of nodes, layers, algorithms and functions. A multilayer perceptron with 2 hidden layers and 10 nodes showed the most accurate results in terms of regression and root mean square error.
구조물의 동적 거동예측을 위한 다층퍼셉트론 최적화 방법
타비시알리 ( Tabish Ali ),김은주 ( Kim Robin Eunju ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
The use of Artificial Intelligence (AI) to predict the behavior of any system is common these days. Use of the technology may be economical in terms of both time and cost. The database methods are robust and reliable. The current study is about the application of AI for predicting the dynamic responses of steel frame buildings. To obtain an optimized AI method, different multi-layer perceptron were trained and tested by varying the hyperparameters like number of nodes, layers, algorithms and functions. A multilayer perceptron with 2 hidden layers and 10 nodes showed the most accurate results in terms of regression and root mean square error.
A critical review on artificial roughness provided in rectangular solar air heater duct
Alam, Tabish,Kim, Man-Hoe Elsevier 2017 RENEWABLE & SUSTAINABLE ENERGY REVIEWS Vol.69 No.-
<P><B>Abstract</B></P> <P>Applications of artificial roughness on the underside of absorber plate in solar air heater duct have been widely used to improve heat transfer with moderate increase of friction factor. The design of the roughness shape and arrangement is most important to optimize the roughened surfaces. The roughness parameters and ribs arrangement are responsible to alter the flow structure and heat transfer mechanisms are mainly governed by flow structure. The critical reviews on various artificial roughness elements available in literature have been conducted and the effects of the roughness patterns are discussed. The Nusselt number and friction factor correlations for various roughness elements have been summarized. A comparison study of thermohydraulic performance of different roughness elements has also been reported to understand the results of applications of artificial roughness.</P>
Heat transfer enhancement in solar air heater duct with conical protrusion roughness ribs
Alam, Tabish,Kim, Man-Hoe Elsevier 2017 Applied thermal engineering Vol.126 No.-
<P><B>Abstract</B></P> <P>Application of protrusion rib roughnesses on the absorber plate of solar air heater (SAH) duct can effectively enhance the heat transfer rate irrespective of pressure drop penalty. This paper presents the numerical investigation of SAH duct, roughened with conical protrusion ribs. Effect of relative ribs pitch (6≤p/e≤12) and relative ribs height (0.020≤e/D≤0.044) on Nusselt number and friction factor have been studied for the range of Reynolds number from 4000 to 16,000. Thermal efficiency of roughened duct have been determined using useful energy gain to air and heat losses to environment. The maximum thermal efficiency (η) and efficiency enhancement factor (EEF) are found as 69.8% and 1.346%, respectively. Correlations of friction factor and Nusselt number have also been developed as function of Reynolds number and roughness parameters of conical ribs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Investigate CFD analysis of SAH duct, roughened with conical protrusion ribs. </LI> <LI> Provide thermohydraulic performance for SAH duct with conical protrusions ribs. </LI> <LI> Obtain maximum thermal efficiency of 70% and efficiency enhancement factor of 1.35. </LI> <LI> Provide Nusselt number and friction factor correlations as function of <I>Re</I> number. </LI> </UL> </P>