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Rehman, Muhammad Muqeet,Siddiqui, Ghayas Uddin,ur Rehman, Mohammad Mutee,Kim, Hyun Bum,Doh, Yang Hoi,Choi, Kyung Hyun Elsevier 2018 Materials research bulletin Vol.105 No.-
<P><B>Abstract</B></P> <P>In this study, we have proposed a flexible, rewritable and nonvolatile memory device based on an advanced 2D nanocomposite of hexagonal boron nitride (hBN) flakes and molybdenum disulfide quantum dots (MoS<SUB>2</SUB> QDs). Complete device fabrication was carried out by using extremely simple and highly controllable all printed technology. The electrical characteristics exhibited by the as developed memory devices included the switching ratio, electrical endurance and retention time of ∼10<SUP>3</SUP>, 10<SUP>3</SUP> and 10<SUP>4</SUP> respectively. The device turned ON and OFF at the SET and RESET threshold voltages of +1.4 V and −1 V respectively. The obtained results of electrical and thermal characterizations exhibited that the switching ratio decreases via either increasing temperature (300 K–380 K) or device size (42 μm–100 μm) hence verifying the formation of conductive filament through the functional layer. Moreover, no major degradation in the switching characteristics was observed even after 1500 bending cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We have proposed a flexible, rewritable and NVM device based on an advanced 2D nanocomposite. </LI> <LI> 2D nanocomposite is synthesized by mixing hBN flakes and MoS<SUB>2</SUB> QDs. </LI> <LI> Entire device was fabricated through extremely simple and highly controllable printing technology. </LI> <LI> The RRAM device was tested electrically, mechanically, thermally and chemically. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Diet-Right: A Smart Food Recommendation System
( Faisal Rehman ),( Osman Khalid ),( Nuhman Ul Haq ),( Atta Ur Rehman Khan ),( Kashif Bilal ),( Sajjad A. Madani ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.6
Inadequate and inappropriate intake of food is known to cause various health issues and diseases. Due to lack of concise information about healthy diet, people have to rely on medicines instead of taking preventive measures in food intake. Due to diversity in food components and large number of dietary sources, it is challenging to perform real-time selection of diet patterns that must fulfill one`s nutrition needs. Particularly, selection of proper diet is critical for patients suffering from various diseases. In this article, we highlight the issue of selection of proper diet that must fulfill patients` nutrition requirements. To address this issue, we present a cloud based food recommendation system, called Diet-Right, for dietary recommendations based on users` pathological reports. The model uses ant colony algorithm to generate optimal food list and recommends suitable foods according to the values of pathological reports. Diet-Right can play a vital role in controlling various diseases. The experimental results show that compared to single node execution, the convergence time of parallel execution on cloud is approximately 12 times lower. Moreover, adequate accuracy is attainable by increasing the number of ants.
A Multi-Group Analysis of Risk Management Practices of Public and Private Commercial Banks
Khurram REHMAN,Hadi Hassan KHAN,Bilal SARWAR,Noor MUHAMMAD,Wahab AHMED,Zia Ur REHMAN 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11
The study examines the relationship between credit risk and operational risk (understanding of risk management, risk identification, risk assessment and control, and risk monitoring) on risk management practices followed by private and public sector commercial banks. The cross-sectional data method was used to check the impact of risk management practices. Data was collected from the bank employees and a total of 284 respondents were finally selected for further analysis. Measurement Invariance of Composite Models analysis is used to test the quality of the measurement model for sub-samples, and multi-group analysis is used for path analysis in sub-sample through PLS-SEM. The findings of the study as the total sample show that both types of banks are managing adequate and significant risk management practices. On the other hand, sub-groups’ results show private sector banks are more momentous than public sector banks. Risk identification is significantly different at the sub-group level, which shows public sector banks are more concentrating on this type of risk. Understanding of risk management has no significant effect on both types of banks and risk assessment & control for public sector banks, and there is a difference in the risk management practices among private and public sector commercial banks.
Butt, Abdul Rehman Sadiq,Abbasi, Muhammad Athar,Aziz-ur-Rehman, Muhammad Athar,Siddiqui, Sabahat Zahra,Raza, Hussain,Hassan, Mubashir,Shah, Syed Adnan Ali,Shahid, Muhammad,Seo, Sung-Yum Elsevier 2019 Bioorganic chemistry Vol.86 No.-
<P><B>Abstract</B></P> <P>The present research was designed for the selective synthesis of novel bi-heterocyclic acetamides, <B>9a-n</B>, and their tyrosinase inhibition to overwhelm the problem of melanogenesis. The structures of newly synthesized compounds were confirmed by spectral techniques such as <SUP>1</SUP>H NMR, <SUP>13</SUP>C NMR, and EI-MS along with elemental analysis. The inhibitory effects of these bi-heterocyclic acetamides (<B>9a-n</B>) were evaluated against tyrosinase and all these molecules were recognized as potent inhibitors relative to the standard used. The Kinetics mechanism was analyzed by Lineweaver-Burk plots which explored that compound, <B>9h</B>, inhibited tyrosinase competitively by forming an enzyme-inhibitor complex. The inhibition constants K<I> <SUB>i</SUB> </I> calculated from Dixon plots for this compound was 0.0027 µM. The computational study was coherent with the experimental records and these ligands exhibited good binding energy values (kcal/mol). The hemolytic analysis revealed their mild cytotoxicity towards red blood cell membranes and hence, these molecules can be pondered as nontoxic medicinal scaffolds for skin pigmentation and related disorders.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of novel bi-heterocyclic acetamides and their tyrosinase inhibition to overwhelm the problem of melanogenesis. </LI> <LI> <I>In vitro</I> and <I>in silico</I> analysis were performed to check their inhibitory potential against tyrosinase enzymes. </LI> <LI> The molecules with small sized methyl group/s at <I>ortho</I>-position/s in aryl part or a flexible phenethyl group, generally inhibited the tyrosinase in an excellent manner. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
자체전원공급 가능한 시스템을 위한 유연한 저전력 저항 메모리 소자
Muhammad Muqeet Rehman,Hafiz Mohammad Mutee ur Rehman,Shenawer Ali Khan,Muhammad Saqib,Woo Young Kim 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
최근 유기 비휘발성 메모리 장치는 주목받고 있다 1, 2. 본 연구에서, 두 고분자 물질(오렌지 염료, 폴리 3-헥실티오핀)의 합성물로 제작된 비휘발성 메모리 소자를 보고한다. 이 메모리 소자는 유연기판 상에 은(Ag)/유기복합체/은(Ag)의 샌드위치 구조를 가지도록 제조되었다. 제작된 메모리 소자는 -1.5V에서 +1.5V 까지의 동작전압 범위에서 전류 상한선을 1mA를 가지도록 작동하였고, 그 결과 저전력소모 동작이 가능하게 되었다. 또한 100 번 이상의 반복 측정에서도 고저항 상태와 저저항 상태가 서로 간섭하지 않고 일정한 동작을 유지하였으며, 4시간 이상 연속 동작에서도 정상 동작하였음을 확인하였다. 이 메모리 소자의 동작 메커니즘은 공간전하제한 전류(SCLC) 메커니즘으로 작동함을 이중로그 곡선으로부터 확인할 수 있었고, 오렌지 염료를 추가할수록 메모리동작을 위한 문턱전압의 크기가 감소함을 확인하였다. 폴리 3-헥실티오핀 기반의 기존 연구결과에 비해 굽힘반경 5cm 범위까지 25 번의 굽힘측정에서도 안정적인 결과를 나타내었다. 본 연구 성과는 유기물질을 기반으로 하는 고신뢰성 저전력 메모리 소자를 위한 중요한 진전으로 평가되며, 나노발전소자와도 호환가능한 자체전력공급 가능한 시스템의 중요한 요소로서 기여할 것으로 기대된다. Organic nonvolatile memory devices are of significant interest these days<sup>1,2</sup>. In this study we have reported the non-volatile memory behavior of an organic composite based on two polymers i.e. orange dye (OD) and poly(3-hexylthiophene-2,5-diyl) (P3HT). This memory device was fabricated on flexible substrate for the possible application of wearable electronics with a sandwiched structure of silver (Ag)/P3HT-OD/Ag. This device exhibited its memory behavior by applying a small voltage sweep of – 1.5 V to 1.5 V with a current compliance (CC) of 10<sup>-3</sup> A hence, resulting in low power consumption. The obtained electrical results were highly stable as the values of both high resistance state (HRS) and low resistance state (LRS) were not deteriorated for more than 100 voltage sweeps. The device was tested for nearly 4 h without any considerable deterioration in its electrical characteristics. The conduction mechanism of this device was based on space charge limited current (SCLC) model as depicted form the double logarithmic I-V curve. Addition of OD resulted in the reduction of threshold voltage (V<sub>th</sub>) value due to its lower value of work function which provided an easy path for the charge carriers to move from one electrode to another electrode. Significant achievement of this work is that no other P3HT based RRAM device has been characterized for its mechanical robustness, but our memory device showed stable electrical results against 25 bending cycles in the bending diameter range of 15 cm to 5 cm. This device is a significant step forward towards achieving a next generation low power memory device based on organic materials. Also, this low-power device will be expected to combine with nanogenerator for self-powered system in future.
Rana Naveed Ur Rehman,Yaohua You,Chengquan Yang,Abdul Rehman Khan,Pengmin Li,Fengwang Ma 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.4
The red coloration of young crabapple (Malus orientalis) flowers results from their high cellular concentrationof anthocyanins. As the petals grow larger, the color fades, which is commonly regarded as being caused by floraltissue expansion diluting the anthocyanin levels in larger cells. We hypothesized that the anthocyanins are degradeddue to hydrogen peroxide (H2O2) and that the concentrations of each phenolic intermediate depends on the physiologicalgrowth of flower petals. A high-performance liquid chromatography (HPLC) analysis was performed to characterizethe identities and concentrations of the diverse array of phenolics present during different growth stages in the crabappleflowers. The concentrations of gallic acid, caffeic acid, syringic acid, chlorogenic acid, phloridzin, procyanidin B1,procyanidin B2, and catechin significantly increased throughout development, while epicatechin and cyanidin-3-galactosidelevels declined. Most flavonols (quercetin-3-xyloside, quercetin-3-rhaminose, quercetin-3-glucoside, and quercetin-3-arabinoside)increased until the fourth stage, after which they declined suddenly. Likewise, cyanidin-3-galactoside degraded sharplyat stage III, exhibiting reciprocal relationship with H2O2 concentration. Our results suggest that the concentrations ofphenolic compounds are congruent with their functional activities in floral tissues, and that their systematicfluctuation mainly depends on environmental cues and physiological imbalances, not merely petal expansion. Theresults of this study will be useful for better understanding the physiological changes in phenolic content andanthocyanin degradation that occur during flower development.