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Millimeter-Wave Concurrent Beamforming:A Multi-Player Multi-Armed Bandit Approach

Computers, Materials & Continua 2020年第12期65卷 1987-2007页

作者： Ehab Mahmoud Mohamed sherief hashima Kohei Hatano Hani Kasban Mohamed Rihan Electrical Engineering Department College of EngineeringPrince Sattam Bin Abdulaziz UniversityWadi Addwasir11991Saudi Arabia Electrical Engineering Department Faculty of EngineeringAswan UniversityAswan81542Egypt Computational Learning Theory Team RIKEN-Advanced Intelligent ProjectFukuoka819-0395Japan Engineering Department Nuclear Research CenterEgyptian Atomic Energy AuthorityCairo13759Egypt Faculty of Arts and Science Kyushu UniversityFukuok819-0395Japan Electronics and Electrical Communication Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

The communication in the Millimeter-wave(mmWave)band,i.e.,30~300 GHz,is characterized by short-range transmissions and the use of antenna beamforming(BF).Thus,multiple mmWave access points(APs)should be installed to fully cover a target environment with gigabits per second(Gbps)connectivity.However,inter-beam interference prevents maximizing the sum rates of the established concurrent links.In this paper,a reinforcement learning(RL)approach is proposed for enabling mmWave concurrent transmissions by finding out beam directions that maximize the long-term average sum rates of the concurrent links.Specifically,the problem is formulated as a multiplayer multiarmed bandit(MAB),where mmWave APs act as the players aiming to maximize their achievable rewards,i.e.,data rates,and the arms to play are the available beam directions.In this setup,a selfish concurrent multiplayer MAB strategy is advocated.Four different MAB algorithms,namely,ϵ-greedy,upper confidence bound(UCB),Thompson sampling(TS),and exponential weight algorithm for exploration and exploitation(EXP3)are examined by employing them in each AP to selfishly enhance its beam selection based only on its previous observations.After a few rounds of interactions,mmWave APs learn how to select concurrent beams that enhance the overall system performance.The proposed MAB based mmWave concurrent BF shows comparable performance to the optimal solution.

关键词： Millimeter wave(mmWave) concurrent transmissions reinforcement learning multiarmed bandit(MAB)

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3,5-Bis(arylidene)-4-piperidones as potential dengue protease inhibitors

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Acta Pharmaceutica Sinica B 2017年第4期7卷 479-484页

作者： Hasnah Osman Nor hashima Idris Ezatul Ezleen Kamarulzaman Habibah A.Wahab Mohd.Zaheen Hassan School of Chemical Sciences Universiti Sains Malaysia School of Pharmaceutical Sciences Universiti Sains Malaysia

Dengue is a severe mosquito-borne viral infection causing half a million deaths annually.Dengue virus NS2B/NS3 protease is a validated target for anti-dengue drug design. A series of hitherto unreported 3,5-bis(arylidene)-4-piperidones analogues 4a–4j were synthesized and screened in silico against DENV2 NS2B/NS3 protease to elucidate their binding mechanism and orientation around the active sites. Results were validated through an in vitro DENV2 NS2B/NS3 protease assay using a fluorogenic Boc-Gly-Arg-Arg-AMC substrate. Nitro derivatives of 3,5-bis(arylidene)-4-piperidones(4e and 4j) emerged as promising lead molecules for novel protease inhibitors with an IC50 of 15.22 and16.23 mmol/L, respectively, compared to the standard, panduratin A, having IC50 of 57.28 mmol/L.

关键词：登革热病毒 NS2B/NS3 朊酶 Piperidone ，不饱和的酉同类朊酶禁止者

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Translation and Validation of Malay Version 5-Items Brief Illness Perception Questionnaire, BIP-Q5 towards COVID-19 among Malaysian Nurses

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Advances in Infectious Diseases 2022年第3期12卷 383-391页

作者： Hafizah Pasi Nor Azam Kamaruzaman Nadzirah Ahmad Basri Nur Hakimah A. Manan hashima E. Nasreen Department of Community Medicine Kulliyyah of Medicine International Islamic University Malaysia Kuantan Malaysia Department of Family Medicine Kulliyyah of Medicine International Islamic University Malaysia Kuantan Malaysia Department of Psychiatry Kulliyyah of Medicine International Islamic University Malaysia Kuantan Malaysia Department of Psychiatry and Mental Health Sultan Ahmad Shah Medical Centre (SASMEC) Kuantan Malaysia

Introduction: Currently, own individual perception is recognized as one of the important factors in the prevention of disease, including coronavirus disease, COVID-19. Given the massive impact of COVID-19 on all population’s life, including nurses as one of the main health services providers in the country, this study aims to translate and validate the Malay Version 5-Items Brief Illness Perception Questionnaire, BIP-Q5 towards COVID-19 among Malaysian nurses. Materials and Methods: Forward and backward translations and pretesting of the BIP-Q5 to Malay were conducted among nurses, subject matter experts, and language professionals. The validations process was elicited through an online cross-sectional study involving 56 nurses based on a ~10:1 subject-to-items ratio sample size estimations. Results: The principal component analysis (PCA) revealed one best component with eigenvalues more than one, confirming the questionnaire’s original version. There are five items within the single component, and all are with weightage of over 43%. The scree plot supported the findings, which showed that at least one factors are suitable to be retained. The overall Cronbach’s α coefficient was 0.7 and the intraclass correlation coefficient was 0.659. The Kaiser-Meyer-Olkin was 0.655, and Bartlett’s test of sphericity p-value was Conclusion: This study showed that the translated Malay Version 5-Items Brief Illness Perception Questionnaire, BIP-Q5 has a good psychometric property, and is a valid and reliable tool to be used to measure illness perceptions towards COVID-19 among Malaysian nurses.

关键词： Validation Malay BIP-Q5 COVID-19 Nurses

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Acaricidal activity of Cymbopogon citratus and Azadirachta indica against house dust mites

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Asian Pacific Journal of Tropical Biomedicine 2011年第5期1卷 365-369页

作者： Azima Laili Hanifah Siti Hazar Awang Ho Tze Ming Suhaili Zainal Abidin Maizatul hashima Omar Acarology Unit Infectious Disease Research CenterInstitute for Medical ResearchJalan Pahang Phytochemistry Unit Herbal Medical Research CenterInstitute for Medical ResearchJalan Pahang

Objective:To examine the acaricidal effects of the essential oil of Cymbopogon citratits leaf extract(lemongrass)and ethanolic Azadirachta indica leaf extract(neem)against house dust mites Dermatophagoides farinae(D.farinae)and Dermalophagoides pteronyssinus(D.pteronyssinus).Methods:Twenty-five adults mites were placed onto treated filter paper that is soaked with plant extract and been tested at different concentrations(50.00%,25.00%,12.50%,6.25%and 3.13%)and exposure times(24hrs,48hrs,72hrs and 96 hrs).All treatments were replicated 7 times,and the experiment repeated once.The topical and contact activities of the two herbs were investigated.Results:Mortalities from lemongrass extract were higher than neem for both topical and contact activities.At 50%concentration,both 24 hrs topical and contact exposures to lemongrass resulted in more than 91%mortalities for both species of inites.At the same concentration and exposure time,neem resulted in topical mortalities of 40.3%and 15.7%against D.pteronyssinus and D.farinae respectively;contact mortalities were 8.0%and 8.9%against the 2 mites,respectively.There was no difference in topical mortalities of D.pteronyssinus from exposure to concentrations oflemongrass and neem up to 12.50%;lemongrass was more effective than neem at the higher concentrations.Conclusions:Generally,topical mortalities of D.farinae due to lemongrass are higher than that due to neem.Contact mortalities of lemongrass are always higher that neem against both species of mites.

关键词： Acaricidal Lemongrass Neem House dust mites Cymbopogon citratus Azadirachta indica Dermatophagoides farinae Dermatophagoides pteronyssinus

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Impact of postnatal maternal depressive symptoms and infant’s sex on mother-infant interaction among Bangladeshi women

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Health 2013年第2期5卷 237-244页

作者： Maigun Edhborg Beatrice Hogg hashima-E Nasreen Zarina Nahar Kabir Department of Neurobiology Care Sciences and Society Karolinska Institutet Stockholm Sweden Research and Evaluation Division BRAC Dhaka Bangladesh

Aim: To investigate the impact of postnatal depressive symptoms and infant sex on perceived and observed mother-infant interaction among rural Bangladeshi women. Methods: Fifty women with depressive symptoms and their infants at 2 - 3 months were compared with 50 women without depressed symptoms and their infants, matched on geographic areas, parity and infant sex. The Edinburgh Postnatal Depression Scale assessed depressive symptoms, the Postpartum Bonding Questionnaire assessed the mother’s perception of bonding with the infant and mother-infant interactions were videotaped and analyzed with the Global Rating Scale. Results: Mothers with depressive symptoms were poorer, were less educated and rated lower infant bonding than mothers without depressive symptoms (p = 0.03), yet objective observation revealed no difference between the two groups regarding maternal interactive behavior (p = 0.57). However, infants, particularly boys (p = 0.002), of mothers with depressive symptoms fretted more in mother-infant interaction than infants of mothers without depressive symptoms (p = 0.009). Conclusion: Although mothers with depressive symptoms did not show less sensitivity in interactive behavior at 2 - 3 months than those without depressive symptoms, our results indicate that infants, particularly boys, of mothers with depressive symptoms may be negatively influenced by depressive symptoms.

关键词： Postpartum Depressive Symptoms Mother-Infant Interaction Bonding Bangladesh

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Comparison of Standard Elution and Displacement Modes in Centrifugal Partition Chromatography for an Efficient Purification of Four Anthocyanins from Hibiscus sabdariffa L.

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Journal of Pharmacy and Pharmacology 2018年第8期6卷 701-711页

作者： Nor Syaidatul Akmal Mohd Yousof Nikos Xynos Evanthia Dina Maizatul hashima Omar Choong Yew Keong Mohd Isa Wasiman Nektarios Aligiannis Phytochemistry Unit Herbal Medicine Research Centre Institute for Medical Research Jalan Pahang Kuala Lumpur 50588 Malaysia Laboratory of Pharmacognosy and Natural Products Chemistry School of Pharmacy University of Athens Panepistimioupoli Zografou Athens 15771 Greece Rousselet Robatel Kromaton 45 Avenue Rhin et Danube Annonay 07104 France

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