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Energy-Efficient Low-Complexity Algorithm in 5G Massive MIMO Systems

Computers, Materials & Continua 2021年第6期67卷 3189-3214页

作者： Adeeb Salh Lukman Audah Qazwan Abdullah nor Shahida M.Shah Shipun A.Hamzah Shahilah nordin Nabil Farah Wireless and Radio Science Centre(WARAS) Faculty of Electrical and Electronic EngineeringUniversiti Tun Hussein Onn MalaysiaBatu PahatJohor86400Malaysia Faculty of Engineering Technology Universiti Tun Hussein Onn MalaysiaPagohMuarJohorMalaysia Fakulti Kejuruteraan Elektrik Universiti Teknologi MARA Kampus Permatang Pauh Permatang PauhPulau Pinang13500Malaysia

Energy efficiency(EE)is a critical design when taking into account circuit power consumption(CPC)in fifth-generation cellular *** problems arise because of the increasing number of antennas in massive multiple-input multiple-output(MIMO)systems,attributable to inter-cell interference for channel state *** from that,a higher number of radio frequency(RF)chains at the base station and active users consume more power due to the processing activities in digital-to-analogue converters and power ***,antenna selection,user selection,optimal transmission power,and pilot reuse power are important aspects in improving energy efficiency in massive MIMO *** work aims to investigate joint antenna selection,optimal transmit power and joint user selection based on deriving the closed-form of the maximal EE,with complete knowledge of large-scale fading with maximum ratio *** also accounts for channel estimation and eliminating pilot contamination as antennas M→∞.This formulates the optimization problem of joint optimal antenna selection,transmits power allocation and joint user selection to mitigate inter-cellinterference in downlink multi-cell massive MIMO systems under minimized reuse of pilot sequences based on a novel iterative low-complexity algorithm(LCA)for Newton’s methods and Lagrange *** analyze the precise power consumption,a novel power consumption scheme is proposed for each individual antenna,based on the transmit power amplifier and *** results demonstrate that the maximal EE was achieved using the iterative LCA based on reasonable maximum transmit power,in the case the noise power is less than the received power *** maximum EE was achieved with the desired maximum transmit power threshold by minimizing pilot reuse,in the case the transmit power allocationρd=40 dBm,and the optimal EE=71.232 Mb/j.

关键词： Massive MIMO energy efficiency base station active users pilot contamination low-complexity algorithm radio frequency

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Piper sarmentosum as an antioxidant on oxidative stress in human umbilical vein endothelial cells induced by hydrogen peroxide

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第5期11卷 357-365页

作者： Abdul Hamid HAFizaH Zakaria ZAITON Amom ZULKHAIRI Adenan MOHD ILHAM Megat Mohd nordin nor ANITA Abdullah Mahdy ZALEHA Department of Physiology Universiti Kebangsaan Malaysia Medical CentreJalan Raja Muda Aziz50300 Kuala LumpurMalaysia Department of Human Anatomy Division of PhysiologyFaculty of Medicine and Health SciencesUniversiti Putra Malaysia Forest Research Institute of Malaysia Department of Obstetrics and Gynecology Universiti Kebangsaan Malaysia Medical Centre

Endothelial cell death due to increased reactive oxygen species(ROS) may contribute to the initial endothelial injury,which promotes atherosclerotic lesion *** sarmentosum(PS),a natural product,has been shown to have an antioxidant property,which is hypothesized to inhibit production of ROS and prevent cell ***,the present study was designed to determine the effects of PS on the hydrogen peroxide(H2O2)-induced oxidative cell damage in cultured human umbilical vein endothelial cells(HUVECs).In this experiment,HUVECs were obtained by collagenase perfusion of the large vein in the umbilical cord and cultured in medium M200 supplemented with low serum growth supplementation(LSGS).HUVECs were treated with various concentrations of H2O2(0-1000 μmol/L) and it was observed that 180 μmol/L H2O2 reduced cell viability by 50% as denoted by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT) *** the above concentration as the positive control,the H2O2-induced HUVECs were concomitantly treated with various concentrations(100,150,250 and 300 μg/ml) of three different extracts(aqueous,methanol and hexane) of ***(MDA),superoxide dismutase(SOD),catalase(CAT) and glutathione peroxidase(GPX) levels showed a significant increase(P<0.05) in HUVECs compared to the negative ***,PS extracts showed a protective effect on HUVECs from H2O2-induced cell apoptosis with a significant reduction in MDA,SOD,CAT and GPX levels(P<0.05).Furthermore,PS had exhibited ferric reducing antioxidant power with its high phenolic ***,it was concluded that PS plays a beneficial role in reducing oxidative stress in H2O2-induced HUVECs.

关键词： Piper sarmentosum Human umbilical vein endothelial cells(HUVECs) Malondialdehyde Oxidative stress Antioxidant enzymes

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Development of Immunosensor for Early Detection of Aquatic Harmful Algal Blooms （HABs）

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材料科学与工程（中英文B版） 2017年第3期7卷 127-134页

作者： Faridah Salam Hazana Razali Gayah Abdul rahman Roziawati Mohd Razali Mohd nor Azman Ayub Syah Noor Muhamad Ramli norhafniza Awaludin Biotechnology and Nanotechnology Research Centre Malaysian Agricultural Research and Development Institute (MARDI) MARDI Headquarters Persiaran MARD1-UPM Serdang 43400 Selangor Malaysia Fisheries Research lnstitute(FRI) Batu Maung 11960 Penang Malaysia

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The protective effects of procyanidin C-1 on bisphenol A-induced testicular dysfunction in aged mice

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Food Science and Human Wellness 2022年第4期11卷 965-974页

作者： Mastura Abd Malek Razif Dasiman nor-Ashikin Mohamed Noor Khan Sofee Mohamed-Akhlak Mohd-Hafi zi Mahmud Maternofetal and Embryo Research Group(MatE) Faculty of MedicineUniversiti Teknologi MARASelangor BranchSungai Buloh Campus47000 Sungai BulohSelangorMalaysia Faculty of Health Sciences Universiti Teknologi MARASelangor BranchPuncak Alam Campus42300 Puncak AlamSelangorMalaysia

The number and quality of sperm are decreased due to bisphenol A(BPA) exposure, an endocrine-disrupting chemical on the male reproductive system, especially in advanced paternal age(APA). Procyanidin C-1(PCY-1), an antioxidant from grape seed(Vitis vinifera L.), has demonstrated anti-viral, anti-melanogenic and immunostimulatory effects. Therefore, this study aims to determine the effects of PCY-1 intervention on sperm parameters, testis morphological changes, serum testosterone, oestradiol, and luteinizing hormone(LH) concentrations and the expression of apoptotic(Bax and Bcl-2) and mitochondria-related(Mfn1 and Opa1) genes in BPA-exposed aged mice. Results revealed that PCY-1 intervention improves aged male fertility in BPA-exposed conditions by decreasing abnormal sperms percentage and increasing spermatogenic cell diameter and epithelial height. PCY-1 also decreased oestradiol, and increased LH and testosterone levels. The gene expression of Bax was significantly down-regulated by PCY-1 intervention. In contrast, Bcl-2 was substantially up-regulated. Expression of Mfn1 and Opa1 genes were also significantly up-regulated in the PCY intervention group. Hence, it is demonstrated that PCY-1 was able to mitigate the adverse effects of BPA on reproductive parameters of aged mice. Collectively, we postulated that PCY-1 has a potential role in protecting the ageing male reproductive system against the damaging impacts of BPA.

关键词： Apoptosis Bisphenol A Procyanidin Mitochondrial dynamics Testis

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Identifications of drug resistance mutations among antiretroviral treatment naive HIV-1 patients in Peninsular Malaysia

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Asian Pacific Journal of Tropical Medicine 2017年第1期10卷 73-76页

作者： Rozainanee Mohd Zain Nabila Ibrahim Suriani Ismail Jeyanthi Suppiah nor Aziyah Mat Rahim Ravindran Thayan Virology Unit Institute for Medical ResearchInfectious Disease Research CentreJalan Pahang50588Kuala LumpurMalaysia

Objective: To determine drug resistance mutations and the HIV-1 subtypes among antiretroviral treatment naive HIV-1 patients in Peninsular Malaysia,Methods: A total of 45 samples from four hospitals that provide HIV viral load services were subjected to the amplification of the protease and two third of reverse transcriptase regions of the pol gene by RT-PCR and Sanger sequencing,Drug resistance mutation(DRM) interpretation reports the presence of mutations related to protease inhibitors(PIs),Nucleoside reverse-transcriptase inhibitors(NRTI) and Non-nucleoside reverse-transcriptase inhibitors(NNRTI) based on analysis using Stanford HIV database program,Results: DRMs were identified in 35% of patients,among which 46.7% of them showed minor resistance to protease inhibitor with A71 V and L10 l were the commonest DRMs detected,About 21.4% and 50.0% of patients had mutations to NRTIs and NNRTIs,respectively,CRF01_AE was found to be the predominant HIV-1 subtype,Conclusions: These findings have served as an initial crucial data in determining the prevalence of transmitted HIV-1 drug resistance for the country,However,more samples from various parts of the country need to be accumulated and analyzed to provide overall HIV-1 drug resistance in the country.

关键词： HIV Resistance Malaysia Antiretroviral treatment naive

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Outcome of trabeculectomy in hospital Melaka,Malaysia

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International Journal of Ophthalmology(English edition) 2012年第3期5卷 384-388页

作者： Moon Heng Hah Raja norliza Raja Omar Juliana Jalaluddin nor Fadzillah Abd Jalil Anusiah Selvathurai Department of Ophthalmology Hospital MelakaMalaysia

AIM:To study the success and outcome of trabeculectomy in Hospital Melaka.· METHODS:Medical records of all patients who underwent trabeculectomy between January 1,2007 and October 31,2010 whom were followed up for at least 6 months postoperatively in Hospital Melaka were retrospectively reviewed.· RESULTS:A total number of 117 eyes of 91 patients with the age range between 12 to 84 years underwent primary trabeculectomy(n =20,17.1%),combine trabeculectomy with cataract surgery(n =90,76.9%),repeat trabeculectomy(n=5,4.3%),and combine repeat trabeculectomy with cataract surgery(n =2,1.7%).The disease spectrum includes primary open-angle glaucoma(POAG)(54 patients,59.3%),priamry angle-closure glaucoma(PACG)(14 patients,15.4%),secondary glaucomas(19 patients,20.9%) and juvenile glaucomas(4 patients,4.4%).Preoperative mean intraocular pressure(IOP) was(24.69±8.67)mmHg as compared to postoperative mean IOP of(15.81±6.66)mmHg,(15.07±4.72)mmHg and(15.68±3.65)mmHg at 6-month,12-month and 24-month ***-two point one percent of eyes(n =96) achieved complete success(CS),12.8%(n =15) with qualified success(QS) and only 5.1%(n = 6) failed at 6 month with two of them warrant other filtering *** twelve months,trabeculectomy with CS was 71.6%(n =63),QS in 22.7%(n =20) and failure in 5.7%(n = 5).Sixty-seven point five percent(n =27) attained CS,20.0%(n =8) with QS while 12.5%(n =5) failed at 24 month postoperative.· CONCLUSION:As the understanding of the lower the IOP,the better the patients retaining the visual function,trabeculectomy is significantly a choice of treatment in uncontrolled *** study concluded that trabeculectomy performed in Hospital Melaka has produced significant success as compared to other studies.·

关键词： trabeculectomy glaucoma success rate

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A comprehensive investigation on the performance of durian rind as a lost circulation material in water based drilling mud

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Petroleum 2019年第3期5卷 285-294页

作者： nor Fatin Fatihah Majid Allan Katende Issham Ismail Farad Sagala norshila Md Sharif Mohd Azizi Che Yunuse Department of Petroleum Engineering Faculty of Chemical and Energy EngineeringUniversiti Teknologi Malaysia(UTM)Malaysia Department of Energy Minerals and Petroleum EngineeringFaculty of Applied Sciences and TechnologyMbarara University of Science and Technology(MUST)Kihumuro CampusUganda Department of Geoscience and Petroleum Norwegian University of Science and Technology(NTNU)Norway Department of Chemical and Petroleum Engineering University of Calgary(UC)2500 University Dr.NW CalgaryCanada Department of Chemical Engineering Faculty of Chemical and Energy EngineeringUniversiti Teknologi Malaysia(UTM)Malaysia

Oil and gas operators worldwide are expecting service companies to deliver integrated techniques to minimize,if not prevent,drilling *** fluids perform vital functions to ensure the success of drilling *** technical challenges often associated with water-based drilling fluids are loss of critical properties,such as fluid loss control and rheology,under demanding conditions,such as in drilling deeper,high-temperature and high-pressure *** loss during drilling operations has a very significant effect in both reservoir formation damage and monetary *** use of durian rind(DR)as a new additive in controlling lost circulation would provide another opportunity to reduce waste and avoid ***,DR was used to improve the rheological properties of water-based mud,and it was prepared for use as a fluid loss *** a better understanding of the influence of pectin on drilling mud properties,the rheological evaluation of untreated DR was compared to that of mud samples containing treated *** pectin in DR was extracted using four different solvents,namely,ethanol,methanol,sodium hydroxide and hydrogen peroxide,and the most effective solvent to remove the pectin was then *** Fourier transform infrared spectroscopy(FTIR)results showed that NaOH was the best solvent for removing pectin from *** analysis(TGA)was used to determine the thermal stability of DR before and after *** TGA results demonstrated that the treated DR had improved thermal stability compared to untreated *** sizes of DR used were coarse,medium,and *** untreated DR presented better rheological properties than the treated *** experimental investigation showed that a concentration of 20 lb/bbl of intermediate-sized DR was the best concentration among the tested samples.

关键词： Lost Circulation Formation damage Durian rind Pectin Water-based mud Rheological properties

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Calf Posture Recognition Using Convolutional Neural Network

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Computers, Materials & Continua 2023年第1期74卷 1493-1508页

作者： Tan Chen Tung Uswah Khairuddin Mohd Ibrahim Shapiai norhariani Md nor Mark Wen Han Hiew Nurul Aisyah Mohd Suhaimie Malaysia-Japan International Institute of Technology Universiti Teknologi MalaysiaKuala Lumpur54100Malaysia Faculty of Veterinary Medicine Universiti Putra MalaysiaSelangor43400Malaysia Faculty of Bioresources and Food Industry Besut22200Malaysia

Dairy farm management is crucial to maintain the longevity of the farm,and poor dairy youngstock or calf management could lead to gradually deteriorating calf health,which often causes premature *** was found to be the most neglected part among the management workflows in Malaysia and has caused continuous loss over the recent *** posture recognition is one of the effective methods to monitor calf behaviour and health state,which can be achieved by monitoring the calf behaviours of standing and lying where the former depicts active calf,and the latter,passive *** posture recognition module is an important component of some automated calf monitoring systems,as the system requires the calf to be in a standing posture before proceeding to the next stage of monitoring,or at the very least,to monitor the activeness of the *** posture such as standing or resting can easily be distinguished by human eye,however,to be recognized by a machine,it will require more complicated frameworks,particularly one that involves a deep learning neural networks *** number of highquality images are required to train a deep learning model for such *** this paper,multiple ConvolutionalNeuralNetwork(CNN)architectures were compared,and the residual network(ResNet)model(specifically,ResNet-50)was ultimately chosen due to its simplicity,great performance,and decent inference *** ResNet-50 models having the exact same architecture and configuration have been trained on two different image datasets respectively sourced by separate cameras placed at different *** were two camera placements to use for comparison because camera placements can significantly impact the quality of the images,which is highly correlated to the deep learning model *** model training,the performance for both CNN models were 99.7%and 99.99%accuracies,respectively,and is adequate for a real-time calf monitoring system.

关键词： Calf posture machine vision deep learning transfer learning

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mRNA transcriptome profiling of human hepatocellular carcinoma cells HepG2 treated with Catharanthus roseus-silver nanoparticles

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World Journal of Hepatology 2023年第3期15卷 393-409页

作者： Nur Asna Azhar Siti Aishah Abu Bakar Marimuthu Citartan nor Hazwani Ahmad Department of Biomedical Science Advanced Medical and Dental InstituteUniversiti Sains MalaysiaKepala Batas 13200Pulau PinangMalaysia Liver Malignancies Research Program Advanced Medical and Dental InstituteUniversiti Sains MalaysiaKepala Batas 13200Pulau PinangMalaysia Faculty of Bioresources and Food Industry Universiti Sultan Zainal AbidinBesut CampusBesut 22200TerengganuMalaysia

BACKGROUND The demand for the development of cancer nanomedicine has increased due to its great therapeutic value that can overcome the limitations of conventional cancer ***,the presence of various bioactive compounds in crude plant extracts used for the synthesis of silver nanoparticles(AgNPs)makes its precise mechanisms of action *** To assessed the mRNA transcriptome profiling of human HepG2 cells exposed to Catharanthus roseus ***(***)-*** The proliferative activity of hepatocellular carcinoma(HepG2)and normal human liver(THLE3)cells treated with *** were measured using MTT *** RNA samples were extracted and sequenced using BGIseq500 *** is followed by data filtering,mapping,gene expression analysis,differentially expression genes analysis,Gene Ontology analysis,and pathway *** The mean IC 50 values of *** on HepG2 was 4.38±1.59μg/mL while on THLE3 cells was 800±1.55μg/*** profiling revealed an alteration of 296 *** induced the expression of stress-associated genes such as MT,HSP and *** signalling pathways were potentially activated through MAPK,TNF and TGF pathways that are responsible for apoptosis and cell cycle *** alteration of ARF6,EHD2,FGFR3,RhoA,EEA1,VPS28,VPS25,and TSG101 indicated the uptake of ***-AgNPs via both clathrin-dependent and clathrinindependent *** This study provides new insights into gene expression study of biosynthesised AgNPs on cancer *** cytotoxicity effect is mediated by the aberrant gene alteration,and more interestingly the unique selective antiproliferative properties indicate the *** as an ideal anticancer candidate.

关键词： Catharanthus roseus HepG2 Silver nanoparticles Transcriptome oxidative stress Apoptosis Cell cycle

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A Passively Mode-Locked Erbium-Doped Fiber Laser Based on a Single-Wall Carbon Nanotube Polymer

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Chinese Physics Letters 2013年第5期30卷 85-88页

作者： F.Ahmad S.W.Harun R.M.nor N.R.Zulkepely H.Ahmad P.Shum Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya50603Kuala LumpurMalaysia Department of Electrical Engineering Universiti Teknologi MalaysiaKuala 54100 LumpurMalaysia Photonics Research Centre University of MalayaKuala Lumpur 50603Malaysia Department of Physics University of MalayaKuala Lumpur 50603Malaysia OPTIMUS School of Electrical and Electronics EngineeringNanyang Technological UniversitySingapore 639798Singapore

We demonstrate a simple,compact and low-cost mode-locked erbium-doped fiber laser(EDFL)using a single-wall carbon nanotube(SWCNT)poly-ethylene oxide(PEO)composite as a passive saturable absorber(SA).The composite with an SWCNT concentration of 18wt%is prepared by mixing the SWCNT homogeneous solution with a diluted PEO polymer solution.A droplet of the polymer composite is applied on the fiber ferrule end,which is then mated to another clean ferrule connector to construct an *** SA is then integrated into the laser system to self-start stable mode locking at 1557 nm without employing a polarization *** EDFL generates a stable soliton pulse train with a duration of 0.81 ps,repetition rate of 44 MHz and average output power of 92.4μW at a 980 nm pump power of 26.8 *** soliton laser starts to lase at a pump power threshold of 14.6 mW.

关键词： pump fiber polarization

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