FRACTIONAL DIFFERENTIATIONS AND INTEGRATIONS OF QUADRUPLE HYPERGEOMETRIC SERIES

Bin-Saad, Maged G.,Nisar, Kottakkaran S.,Younis, Jihad A. Korean Mathematical Society 2021 대한수학회논문집 Vol.36 No.3

The hypergeometric series of four variables are introduced and studied by Bin-Saad and Younis recently. In this line, we derive several fractional derivative formulas, integral representations and operational formulas for new quadruple hypergeometric series.

The Interplay between Comprehensive Use of Performance Management Systems and Corporate Financial and Non-Financial Performance: Evidence from Saudi Arabia

Ahmed Abdullah Saad AL-DHUBAIBI(Ahmed Abdullah Saad AL-DHUBAIBI ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.1

A significant body of prior research on performance management systems (PMSs) either explains the components and the design of the systems or investigates the link between particular system/s and organizational functions, capabilities, or performance. In contrast, this study investigates the comprehensive use of PMSs and relates them to corporate financial and non-financial performance. Further, this study examines whether the association between PMSs and performance varies between industries or is moderated by the size of the company. Data was collected using a questionnaire that was sent to companies from different industries operating in Riyadh province, where the most important businesses in Saudi Arabia are located. A total of 152 usable responses were received. The results of this study revealed that companies use a variety of PMSs at a balanced level. The extent of each category of PMS use is associated with the extent of other PMS categories’ use. However, the larger the company, the more PMSs it uses. Importantly, the results showed a positive and significant association between PMSs’ extent of use and both financial and non-financial performance. This association was minimally moderated by the company size and industry for specific categories of PMSs and performance.

C^*-compactness in L-Fuzzy Topological Spaces

Saad, Ali Kandil,Tantawy, Osama A. E.,Yakout, Mohammed Mostafa,Saleh, Salem Ali M. Korean Institute of Intelligent Systems 2009 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.9 No.4

In this paper we introduce stronger form of the notion of cover so-called p-cover which is more appropriate. According to this cover we introduce and study another type of compactness in L-fuzzy topology so-called $C^*$-compact and study some of its properties with some interrelation.

Deciphering unclassified tumors of non-small-cell lung cancer through radiomics

Saad, Maliazurina,Choi, Tae-Sun Elsevier 2017 Computers in biology and medicine Vol.91 No.-

<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Tumors are highly heterogeneous at the phenotypic, physiologic, and genomic levels. They are categorized in terms of a differentiated appearance under a microscope. Non-small-cell lung cancer tumors are categorized into three main subgroups: adenocarcinoma, squamous cell carcinoma, and large cell carcinoma. In approximately 20% of pathology reports, they are returned unclassified or classified as not-otherwise-specified (NOS) owing to scant materials or poor tumor differentiation.</P> <P><B>Method</B></P> <P>We present a radiomic interrogation of molecular spatial variations to decode unclassified NOS tumor architecture quantitatively. Twelve spatial descriptors with various displacements and directions were extracted and profiled with respect to the subgroups. The profiled descriptors were used to decipher the NOS tumor morphologic clues from the imaging phenotype perspective. This profiler was built as an extended version of a conventional support-vector-machine classifier, wherein a genetic algorithm and correlation analysis were embedded to define the molecular signatures of poorly differentiated tumors using well-differentiated-tumor information.</P> <P><B>Results</B></P> <P>Sixteen multi-class classifier models with an 81% average accuracy and descriptor subset size ranging from 12 to 144 were reported. The average area under the curve was 86.3% at a 95% confidence interval and a 0.03–0.08 standard error. Correlation analysis returned an unclassified NOS membership matrix with respect to the cell-architecture similarity score for the subgroups. The best model demonstrated 53% NOS reduction.</P> <P><B>Conclusion</B></P> <P>The membership matrix is expected to assist pathologists and oncologists in cases of unresectable tumors or scant biopsy materials for histological subtyping and cancer therapy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Non-small cell lung cancer Not-Otherwise-Specified or unclassified tumors not rare </LI> <LI> A quantitative analysis of radiomics is proposed to reduce the NOS cases </LI> <LI> The proposed method decodes the NOS tumor molecular composition computationally </LI> <LI> A membership matrix is used to correlate the NOS tumors to the known subgroups </LI> <LI> The proposed method may benefit patients with unresectable tumors. </LI> </UL> </P>

Improvement of High-Availability Seamless Redundancy (HSR) Traffic Performance for Smart Grid Communications

Saad Allawi Nsaif,이종명 한국통신학회 2012 Journal of communications and networks Vol.14 No.6

High-availability seamless redundancy (HSR) is a redundancy protocol for Ethernet networks that provides two frame copies for each frame sent. Each copy will pass through separate physical paths, pursuing zero fault recovery time. This means that even in the case of a node or a link failure, there is no stoppage of network operations whatsoever. HSR is a potential candidate for the communications of a smart grid, but its main drawback is the unnecessary traffic created due to the duplicated copies of each sent frame, which are generated and circulated inside the network. This downside will degrade network performance and might cause network congestion or even stoppage. In this paper, we present two approaches to solve the above-mentioned problem. The first approach is called quick removing (QR), and is suited to ring or connected ring topologies. The idea is to remove the duplicated frame copies from the network when all the nodes have received one copy of the sent frame and begin to receive the second copy. Therefore, the forwarding of those frame copies until they reach the source node, as occurs in standard HSR, is not needed in QR. Our example shows a traffic reduction of 37.5%compared to the standard HSR protocol. The second approach is called the virtual ring (VRing), which divides any closed-loop HSR network into several VRings. Each VRing will circulate the traffic of a corresponding group of nodes within it. Therefore, the traffic in that group will not affect any of the other network links or nodes, which results in an enhancement of traffic performance. For our sample network, the VRing approach shows a network traffic reduction in the range of 67.7to 48.4%in a healthy network case and 89.7 to 44.8%in a faulty network case, compared to standard HSR.

Direct Lightning Overvoltage Analysis of a Distribution Feeder Considering Integrated Electric Vehicles

Saad Ullah Khan,Khawaja Khalid Mehmood,Soon-Jeong Lee,Zunaib Maqsood Haider,Muhammad Kashif Rafique,Chul-Hwan Kim 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.9

Secure and continuous electric vehicle (EV) charging operation is a key concern for the safety of EVs and their reliable integration with the power grid. During a lightning incident on the distribution network, the security of integrated EVs is threatened. Lightning overvoltages can be damaging for the EVs, resulting in huge repair costs. Thus, it is necessary that the feeder is provided with lightning protection for the safe integration of EVs. This paper has analyzed direct lightning overvoltages on IEEE 13-node distribution feeder with and without surge arrester protection. The system overvoltages are evaluated on primary distribution nodes, which are the prospective locations for EV connection. Results show the importance of lightning protection of the feeder for EV integration.

Quantum One-Time Pad for Direct Communication

Saad Qaisar,Youngmin Jeong,Hyundong Shin 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.11

Compressive Sensing: From Theory to Applications, a Survey

Saad Qaisar,Rana Muhammad Bilal,Wafa Iqbal,Muqaddas Naureen,이승룡 한국통신학회 2013 Journal of communications and networks Vol.15 No.5

Compressive sensing (CS) is a novel sampling paradigmthat samples signals in a much more efficient way than the establishedNyquist sampling theorem. CS has recently gained a lot ofattention due to its exploitation of signal sparsity. Sparsity, an inherentcharacteristic of many natural signals, enables the signalto be stored in few samples and subsequently be recovered accurately,courtesy of CS. This article gives a brief background on theorigins of this idea, reviews the basic mathematical foundation ofthe theory and then goes on to highlight different areas of its applicationwith a major emphasis on communications and networkdomain. Finally, the survey concludes by identifying new areas ofresearch where CS could be beneficial.

Microorganism penetration in dentinal tubules of instrumented and retreated root canal walls. In vitro SEM study

Saad Al-Nazhan,Alaa Al-Sulaiman,Fellwa Al-Rasheed,Fatimah Alnajjar,Bander Al-Abdulwahab,Abdulhakeem Al-Badah 대한치과보존학회 2014 Restorative Dentistry & Endodontics Vol.39 No.4

Objectives: This in vitro study aimed to investigate the ability of Candida albicans (C. albicans) and Enterococcus faecalis (E. faecalis) to penetrate dentinal tubules of instrumented and retreated root canal surface of split human teeth. Materials and Methods: Sixty intact extracted human single-rooted teeth were divided into 4 groups, negative control, positive control without canal instrumentation, instrumented, and retreated. Root canals in the instrumented group were enlarged with endodontic instruments, while root canals in the retreated group were enlarged, filled, and then removed the canal filling materials. The teeth were split longitudinally after canal preparation in 3 groups except the negative control group. The teeth were inoculated with both microorganisms separately and in combination. Teeth specimens were examined by scanning electron microscopy (SEM), and the depth of penetration into the dentinal tubules was assessed using the SMILE view software (JEOL Ltd). Results: Penetration of C. albicans and E. faecalis into the dentinal tubules was observed in all 3 groups, although penetration was partially restricted by dentin debris of tubules in the instrumented group and remnants of canal filling materials in the retreated group. In all 3 groups, E. faecalis penetrated deeper into the dentinal tubules by way of cell division than C. albicans which built colonies and penetrated by means of hyphae. Conclusions: Microorganisms can easily penetrate dentinal tubules of root canals with different appearance based on the microorganism size and status of dentinal tubules.

Improved Low Speed Performance of a PI-DTC Interior PM Machine with Compensations of Dead-Time Effects and Forward Voltage Drops

Saad Sayeef,M. F. Rahman 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

The performance of direct torque control (DTC) interior permanent magnet (IPM) machines at low speed is poor due to a few reasons, namely limited accuracy of stator voltage acquisition and the presence of offset and drift components in the acquired signals. Due to factors such as forward voltage drop across devices in the three phase inverter and dead-time of switching devices, the voltage across the machine terminals differ from the reference voltage vector used to estimate stator flux and electromagnetic torque. This can lead to instability of the IPM drive during low speed operation. Compensation schemes for forward voltage drops and dead-time are implemented, resulting in better performance of the PI DTC IPM drive.