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Passively Q-Switched EDFL Using a Multi-Walled Carbon Nanotube Polymer Composite Based on a Saturable Absorber

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Chinese Physics Letters 2014年第3期31卷 69-72页

作者： F. ahmad H. Haris R. M. nor N. R. Zulkepely H. ahmad S. W. Harun Department of Electrical Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Research Centre University of Malaya Kuala Lumpur 50603 Malaysia Department of Physics University of Malaya Kuala Lumpur 50603 Malaysia

A stable passive Q-switched erbium-doped fiber laser （EDFL） operating at 1563.5 nm is demonstrated by using a multi-walled carbon nanotube （MWCNT） polymer composite film based saturable absorber for the first time. The composite is prepared by mixing the MWCNTs homogeneous solution into a dilute PEO polymer solution before it is left to dry at room temperature to produce thin film. Then the film is sandwiched between two FC/PC fiber connectors and is integrated into the laser cavity for Q-switching pulse generation. The EDFL generates a stable pulse train with repetition rates ranging from 4.5 kHz to 20.0 kHz by varying the 1480 nm pump power from 35 mW to 53 mW. At the 53 mW pump power, the pulse width and pulse energy are 8.8 μs and 15.3 nJ, respectively.

关键词： Saturable absorbers

Review:Botnet detection techniques: review, future trends, and issue

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第11期15卷 943-983页

作者： ahmad KARIM Rosli Bin SALLEH Muhammad SHIRAZ Syed Adeel Ali SHAH Irfan AWAN nor Badrul ANUAR Faculty of Computer Science and Information Technology University of Malaya Kuala Lumpur Malaysia Department of Computer Science University of Bradford Bradford BD7 1DP UK

In recent years, the Internet has enabled access to widespread remote services in the distributed computing environment; however, integrity of data transmission in the distributed computing platform is hindered by a number of security issues. For instance, the botnet phenomenon is a prominent threat to Internet security, including the threat of malicious codes. The botnet phenomenon supports a wide range of criminal activities, including distributed denial of service(DDoS) attacks, click fraud, phishing, malware distribution, spam emails, and building machines for illegitimate exchange of information/materials. Therefore, it is imperative to design and develop a robust mechanism for improving the botnet detection, analysis, and removal process. Currently, botnet detection techniques have been reviewed in different ways; however, such studies are limited in scope and lack discussions on the latest botnet detection techniques. This paper presents a comprehensive review of the latest state-of-the-art techniques for botnet detection and figures out the trends of previous and current research. It provides a thematic taxonomy for the classification of botnet detection techniques and highlights the implications and critical aspects by qualitatively analyzing such techniques. Related to our comprehensive review, we highlight future directions for improving the schemes that broadly span the entire botnet detection research field and identify the persistent and prominent research challenges that remain open.

关键词： Botnet detection Anomaly detection Network security Attack Defense Taxonomy

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

A Q-Switched Erbium-Doped Fiber Laser with a Carbon Nanotube Based Saturable Absorber

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Chinese Physics Letters 2012年第11期29卷 67-69页

作者： S.W.Harun M.A.Ismail F.ahmad M.F.Ismail R.M.nor N.R.Zulkepely H.ahmad Department of Electrical Engineering University of Malaya 50603 Kuala LumpurMalaysia Photonics Research Center Department of PhysicsUniversity of Malaya50603 Kuala LumpurMalaysia Department of Physics University of Malaya50603 Kuala LumpurMalaysia

We demonstrate a simple,compact and low cost Q-switched erbium-doped fiber laser(EDFL)using single-wall carbon nanotubes(CNTs)as a saturable absorber for possible applications in metrology,sensing,and medical *** EDFL operates at around 1560 nm with repetition rates of 16.1 kHz and 6.4 kHz with saturable absorbers SA1 and SA2 at a pump power of 120 *** absorbers are constructed by optically driven deposition and normal deposition *** is observed that the optical deposition method produces a Q-switched EDFL with a lower threshold of 70 mW and better Q-switching performance compared to that of the normal deposition *** EDFL also has pulse energy of 90.3 nJ and pulse width of 11.6μs at 120 mW pump power.

关键词： pump switched Erbium

Zinc and Copper Concentrations in Two Species of Intertidal Crabs from the Middle of the West Coast of Peninsular Malaysia

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湿地科学 2009年第3期7卷 218-229页

作者： Mohammad Mohd Ikram ahmad Ismail Chee Kong Yap nor Azwady Abd Aziz Department of Basic Science and Engineering Faculty of Agriculture and Food Sciences Universiti Putra Malaysia Bintulu Sarawak 97008 Malaysia Department of Biology Faculty of ScienceUniversiti Putra Malaysia UPM 43400 Serdang Selangor Malaysia

A study on Zn and Cu concentrations in 2 species of intertidal crabs,namely Uca annulipes and Dotilla myctiroides collected from the intertidal coastal area of Selangor(5 sites) and Negeri Sembilan(3 sites),west coast of Peninsular Malaysia,was carried *** various localized sources of Zn and Cu discharges towards both the crab species were mentioned.A comparative study between the 2 crab species also revealed that the concentrations of Zn and Cu were significantly(P<0.05) higher in *** when compared to *** difference was related to the organic matter percentage in the crabs' microhabitat sediments since metals can be associated with the organic matter of sediments in which they might ***(P<0.05) higher organic matter content was shown in *** sediments when compared to *** sediments for all *** metal and size relationship in the crabs was also *** relationships between Zn and Cu concentrations with body weight and carapace width of *** and *** were significantly(P<0.01 and P<0.05) correlated although the pair wise was weak.

关键词：沉积物马来西亚半岛有机物质螃蟹

A mouse model of weight-drop closed head injury:emphasis on cognitive and neurological deficiency

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Neural Regeneration Research 2016年第4期11卷 630-635页

作者： Igor Khalin nor Laili Azua Jamari Nadiawati Bt Abdul Razak Zubaidah Bt Hasain Mohd Asri bin Mohd nor Mohd Hakimi bin ahmad Zainudin Ainsah Bt Omar Renad Alyautdin Faculty of Medicine and Defence Health National Defence University of MalaysiaKem Sungai BesiKuala LumpurMalaysia Chemistry Department Centre for Defence Foundation StudiesNational Defence University of MalaysiaKem Sungai BesiKuala LumpurMalaysia Department of Civil Engineering Faculty of EngineeringNational Defence University of MalaysiaKem Sungai BesiKuala LumpurMalaysia Centre for Research and Innovation Management National Defence University of MalaysiaKem Sungai BesiKuala LumpurMalaysia Scientific Centre for Expertise of Medical Application Products Petrovsky BlvdMoscowRussia

Traumatic brain injury（TBI） is a leading cause of death and disability in individuals *** a clinically relevant TBI model in small-sized animals remains fairly *** good screening of potential therapeutics,which are effective in the treatment of TBI,animal models of TBI should be established and *** this study,we established mouse models of closed head injury using the Shohami weight-drop method with some modifications concerning cognitive deficiency assessment and provided a detailed description of the severe TBI animal *** found that 250 g falling weight from 2 cm height produced severe closed head injury in C57BL/6 male *** disorders in mice with severe closed head injury could be detected using passive avoidance test on day 7 after *** from this study indicate that weight-drop injury animal models are suitable for further screening of brain neuroprotectants and potentially are similar to those seen in human TBI.

关键词： nerve regeneration traumatic brain injury neurological severity score passive avoidance weightdrop injury model C57BL/6 mice neural regeneration

一种使用静态分析和遗传搜索在Android恶意软件检测中搜索最优特征的方法（英文）

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Frontiers of Information Technology & Electronic Engineering 2018年第6期19卷 712-736页

作者： ahmad FIRDAUS nor Badrul ANUAR ahmad KARIM Mohd Faizal Ab RAZAK Department of Computer System and Technology University of Malaya Faculty of Computer System & Software Engineering University Malaysia Pahang Department of Information Technology Bahauddin Zakariya University

移动设备制造商在全球范围内快速开发各种Android版本。同时,网络罪犯也在实施各种恶意行为,例如跟踪用户活动、窃取个人数据以及实施银行诈骗。由于在日常生活中使用Android进行重要通信的人群数量庞大,这些网络罪犯从中获得了巨大非... 详细信息

移动设备制造商在全球范围内快速开发各种Android版本。同时,网络罪犯也在实施各种恶意行为,例如跟踪用户活动、窃取个人数据以及实施银行诈骗。由于在日常生活中使用Android进行重要通信的人群数量庞大,这些网络罪犯从中获得了巨大非法收益。为此,安全从业者通过静态和动态分析对恶意软件进行识别。静态分析具有整体代码覆盖、低资源消耗和快速处理的优势。然而,静态分析需要最少量的特征才能对恶意软件进行有效分类。因此,我们采用基于遗传算法(GA)的遗传搜索(GS)在106个字符串中选择特征。为评估由GS确定的最佳特征,我们使用了5种机器学习分类器,分别是Na?ve Bayes(NB)、功能树(FT)、J48、随机森林(RF)和多层感知器(MLP)。在这5种分类器中,FT仅使用6种特征,获得最高准确度(95%)和最高真正率(TPR)(96.7%)。

关键词：恶意软件基因算法机器人特征静态搜索学习分类器安全专业人员

Demethylbelamcandaquinone B from Marantodes pumilum ***(Blume)Kuntze inhibits osteoclast differentiation in RAW264.7 cells

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Asian Pacific Journal of Tropical Biomedicine 2021年第12期11卷 535-542页

作者： Haryati ahmad Hairi Jamia Azdina Jamal nor Ashila Aladdin Khairana Husain Noor Suhaili Mohd Sofi norazlina Mohamed Isa Naina Mohamed ahmad Nazrun Shuid Department of Biochemistry Faculty of MedicineManipal University College MalaysiaJalan Batu HamparBukit Baru75150 MelakaMalaysia Faculty of Pharmacy Universiti Kebangsaan MalaysiaJalan Raja Muda Abdul Aziz50300 Kuala LumpurMalaysia Department of Pharmacology Faculty of MedicinePreclinical BuildingUniversiti Kebangsaan MalaysiaJalan Yaacob LatiffBandar Tun RazakCheras56000 Kuala LumpurMalaysia Department of Pharmacology Faculty of MedicineUniversiti Teknologi MaraJalan Hospital47000 Sungai BulohSelangorMalaysia

Objective:To investigate the bone-resorbing effect of demethylbelamcandaquinone B(Dmcq B)extracted from Marantodes pumilum *** on osteoclast differentiation in RAW264.7 ***:RAW264.7 macrophages were differentiated using RANKL into osteoclast-like ***,they were treated with 10μg/mL Marantodes pumilum *** crude aqueous extract,5μg/mL dichloromethane fraction,and 0.6μg/mL Dmcq B and 0.06μg/mL ***-resistant acid phosphatase 5b(TRACP 5b)as an osteoclast phenotypic marker was determined by TRACP staining and TRACP 5b colometric assay,and bone-resorbing pits were *** gene expression of pro-inflammatory cytokines(TNF-αand IL-6)was ***,the protein expressions of pro-inflammatory cytokines(TNF-αand IL-6)and estrogen receptors were ***:Marantodes pumilum *** crude aqueous extract and Dmcq B inhibited RANKL-stimulated osteoclast differentiation as evidenced by size reduction of giant multinucleated osteoclast cells,decreased TRACP 5b activity as well as the subsiding of resorbed pit area compared with normal *** addition,they reduced the gene and protein expressions of TNF-αand *** pumilum ***,Dmcq B,and estradiol treatments increased the protein expressions of estrogen receptors alpha and beta in ***:Marantodes pumilum *** and its active compound,Dmcq B can inhibit osteoclast differentiation.

关键词： Marantodes pumilum var.alata Phytoestrogen RAW264.7 induced-osteoclast Bone-resorbing effect

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大学生就业问题自评问卷的编制

成都师范学院学报 2022年第4期38卷 104-113页

作者：左春荣 nor Shafrin ahmad 曾吕淮南师范学院教育学院安徽淮南232038 马来西亚理科大学教育学院马来西亚槟城11800

在文献研究、访谈、开放式问卷、专家咨询基础上,构建大学生就业问题的理论模型,编制大学生就业问题自评问卷;抽取国内三所高校404名毕业生进行问卷初测,进行项目分析与修订,最终形成包含12个因子、59个项目的正式问卷。采用正式问卷,... 详细信息

在文献研究、访谈、开放式问卷、专家咨询基础上,构建大学生就业问题的理论模型,编制大学生就业问题自评问卷;抽取国内三所高校404名毕业生进行问卷初测,进行项目分析与修订,最终形成包含12个因子、59个项目的正式问卷。采用正式问卷,对国内五所大学921名学生施测,并运用SPSS 23.0统计软件和Amos 23.0软件进行问卷信效度检验,问卷总体分半信度为0.898,内部一致性系数为0.930;各因子的分半信度和内部一致性系数也较高;验证性因素分析得出总模型和分模型各拟合指标均大于0.9,RMSEA值小于0.08,且各因子与总分的相关明显高于因子之间的相关。大学生就业问题自评问卷具有较好的信度和效度,可以作为大学生就业问题的测评工具。

关键词： “双减”政策自评问卷大学生就业问题就业质量就业指导问卷编制教育测评