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Fractional Order Linear Active Disturbance Rejection Control for Linear Flexible Joint System

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Computers, Materials & Continua 2022年第3期70卷 5133-5142页

作者： Ibrahim M.Mehedi Rachid Mansouri Ubaid M.Al-Saggaf Ahmed I.M.Iskanderani Maamar Bettayeb abdulah Jeza Aljohani Thangam Palaniswamy Shaikh abdul latif abdul latif Department of Electrical and Computer Engineering(ECE) King Abdulaziz UniversityJeddah21589Saudi Arabia Center of Excellence in Intelligent Engineering Systems(CEIES) King Abdulaziz UniversityJeddah21589Saudi Arabia L2CSP Laboratory Mouloud Mammeri UniversityTizi OuzouAlgeria Electrical&Computer Engineering Department University of SharjahUnited Arab Emirates Department of Nuclear Engineering King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Mathematics King Abdulaziz UniversityJeddah21589Saudi Arabia

A linear flexible joint system using fractional order linear active disturbance rejection control is studied in this *** this control scheme,the performance against disturbances,uncertainties,and attenuation is *** active disturbance rejection control(LADRC)is mainly based on an extended state observer(ESO)technology.A fractional integral(FOI)action is combined with the LADRC technique which proposes a hybrid control scheme like *** this FOI action improves the robustness of the standard *** set-point tracking of the proposed FO-LADRC scheme is designed by Bode’s ideal transfer function(BITF)based robust closed-loop concept,an appropriate pole placement *** effectiveness of the proposed FO-LADRC scheme is illustrated through experimental results on the linear flexible joint system(LFJS).The results show the enhancement of the robustness with disturbance ***,a comparative analysis is presented with the results obtained using the integer-order LADRC and FO-LADRC scheme.

关键词： Active disturbance rejection fractional calculus ADRC pole placement linear flexible joint system robust control

Single fiber colorless symmetric WDM-PON architecture using time interleaved remodulation technique for mitigating Rayleigh backscattering resilience

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光电子快报：英文版 2013年第1期9卷 38-41页

作者： Muhammad Idrees Afridi 张杰赵永利 abdul latif Shahab Ahmed Niazi State Key Laboratory of Information Photonics and Optical Communications School of Electronic Engineering Beijing University of Posts and Telecommunications

A time interleaved differential phase shift keying (DPSK) remodulation technique is proposed to mitigate the effect of Rayleigh backscattering (RBS)-induced noise in a single fiber colorless wavelength-division-multiplexing passive optical network (WDM-PON). In order to achieve a cost effective optical network unit (ONU) solution without dedicated laser sources for upstream signals to provide optimum symmetric capacity in a colorless WDM-PON, remodulation becomes the core attraction. Also as the performance of colorless WDM-PON systems suffers from the transmission impairments due to RBS, it is mitigated by using this remodulation scheme. Simulation results show that downstream and upstream signals achieve the error-free performance at 10 Gbit/s with negligible penalty, and enhance the tolerance to RBS-induced noise over a 25 km single-mode fiber.

关键词： WDM-PON 调制技术瑞利后向散射单纤维无色对称交错时间

Ecological fitness of brown planthopper, Nilaparvata lugens (Stål), to rice nutrient management

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Ecological Processes 2017年第1期6卷 149-158页

作者： Md.Mamunur Rashid Mahbuba Jahan Khandakar S.Islam Md.abdul latif Plant Physiology Division Bangladesh Rice Research Institute(BRRI)Gazipur 1701Bangladesh Department of Entomology Bangladesh Agricultural UniversityMymensingh 2202Bangladesh Plant Pathology Division Bangladesh Rice Research Institute(BRRI)Gazipur 1701Bangladesh

Introduction:The brown planthopper(BPH),Nilaparvata lugens(Stål)(Hemiptera:Delphacidae),is a notorious insect pest of *** supplementation can alter plant biochemical compositions which may indirectly affect on ecological fitness parameters of its insect ***,few findings are available on nutrient-induced ecological fitness of BPH and relationship of BPH fitness parameters with its host rice plant biochemical ***:We studied the main and interaction effects of nitrogen(N),phosphorus(P),and potassium(K)inputs on BPH fitness,as measured by the following variables:nymph survival,nymphal duration,adult body weight,and its *** planthopper fitness parameters were regressed as function of rice plant(Oryza sativa)biochemical composition.A completely randomized design with four replications in a factorial scheme was used considering N,P,and K levels as ***:Nitrogen application to the host rice plants provided greater survival and enhanced body weight of *** nymphal duration was found to decrease with N subsidy that caused shorter generation time of *** compounds N and soluble protein(SP),total free sugar(TFS),and silicon(Si)content in rice plant tissue correlated strongly with all fitness traits of ***,SP,and TFS associated positively with BPH survival and body weight,while negatively with nymphal *** contrast,Si had negative correlation with BPH survival and body weight,but positive with nymphal *** supplementation to host plant contributed to increase BPH body *** of P with all parameters of BPH were weak except body weight which was highly significant and *** between N and P inputs demonstrated significant effect on BPH body *** of K had no significant effect on BPH survival and *** analysis did not detect significant relationship of BPH fitness parameters with plant tissue content of ***:The res

关键词： Nilaparvata lugens Nutrient management Survival Nymphal duration Body weight

An AWG-based 10 Gbit/s colorless WDM-PON system using a chirp-managed directly modulated laser

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Optoelectronics Letters 2012年第5期8卷 372-375页

作者： abdul latif 余重秀忻向军 Aftab Husain Ashiq Hussain Abid Munir Yousaf Khan State Key Laboratory of Information Photonics and Optical Communications of Ministry of Education Beijing University of Posts and Telecommunications Signal Processing and Communication Systems Research Group Heavy Industries Taxila Education City University

We propose an arrayed waveguide grating(AWG)-based 10 Gbit/s per channel full duplex wavelength division multiplexing passive optical network(WDM-PON).A chirp managed directly modulated laser with return-to-zero(RZ) differential phase shift keying(DPSK) modulation technique is utilized for downlink(DL) direction,and then the downlink signal is re-modulated for the uplink(UL) direction using intensity modulation technique with the data rate of 10 Gbit/s per channel.A successful WDM-PON transmission operation with the data rate of 10 Gbit/s per channel over a distance of 25 km without any optical amplification or dispersion compensation is demonstrated with low power penalty.

关键词： Electric power transmission Frequency modulation Passive optical networks Wavelength division multiplexing

Biochemical studies on malathion resistance, inheritance and association of carboxylesterase activity in brown planthopper, Nilaparvata lugens complex in Peninsular Malaysia

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Insect Science 2010年第6期17卷 517-526页

作者： M. A. latif Mohd Yosuh Omar Soon Guan Tan S.S. Siraj abdul Rahim Ismail Department of Crop Science Faculty of Agriculture Department of Biology Faculty of Science Department of Cell and Molecular Biology Faculty of Biotechnology and Molecular Science Department of Aquaculture Faculty of Agriculture Universiti Putra Malaysia Serdang Selangor Malaysia

Two sympatric populations of brown planthopper （BPH）, one from rice and the other from Leersia hexandra were collected from each of five locations in Malaysia. All the tested malathion-resistant individuals of the rice BPH population and F1 generation （cross between malathion-resistant [usually caught on rice] and malathion- susceptible [usually caught on Leersia]） showed high esterase activity, while all malathion- susceptible individuals on L. hexandra showed low esterase activity. In the F2 generation, all the individuals tested against malathion were approximately 75% resistant and 25% susceptible and the inheritance pattern of esterase activity （high and low esterase activity） segregated in the same manner to a 3：1 ratio. This confirms that resistance to malathion is mono-factorial and inheritance pattern ofesterase activity is also linked to malathion resistance. Carboxylesterase or total esterase activity in BPH is inherited in a simple Mendelian fashion that is encoded by a single dominant gene. For the total esterase assay, average esterase activity levels in the rice-infesting population ranged from 17.64 to 19.37 nmoles 1-napthol/mg protein while that in the Leersia-infesting population ranged from 5.29 to 6.11 nmoles 1-napthol/mg protein. In terms of esterase activity, the two sympatric Nilaparvata lugens populations separated into two distinct groups. Results based on the tube color intensity test showed 96% and 98% resistant and susceptible individuals were present in the rice- and Leersia-infesting populations, respectively. In a filter paper test, the rice-infesting population had 94% with high esterase activity while the Leersia-infesting population had 96% with low esterase activity.

关键词： brown planthopper carboxylesterase assay inheritance study insecticide resistance rice

L-homophenylalanine Production by Reductive Amination of 2-oxo-4-phenylbutanoic Acid via Integrated Membrane Bioreactor

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材料科学与工程（中英文A版） 2011年第2X期1卷 139-145页

作者： abdul latif ahmad Oh Pei Ching Syamsul Rizal Abd Shukor School of Chemical Engineering Engineering Campus Universiti Sains Malaysia Nibong Teba114300 Penang Malaysia

This paper describes the enzymatic procedures for synthesis of L-homophenylalanine (L-HPA), a precursor for production of angiotensin-converting enzyme (ACE) inhibitor, which possesses significant clinical application in the management of hypertension and congestive heart failure (CHF). For production of L-HPA, the reductive amination of 2-oxo-4-phenylbutanoic acid, catalyzed by L-phenylalanine dehydrogenase was examined. The reaction requires NADH and the cofactor was regenerated from NAD+ catalyzed by formate dehydrogenase. For production of L-HPA in an integrated membrane bioreactor, the kinetic parameters of L-phenylalanine dehydrogenase enzyme are determined. By adjusting the pH and temperature of the reaction solution, high yield could be obtained.

关键词：膜生物反应器苯丙氨酸还原胺化生产丙氨酸脱氢酶血管紧张素转换酶集成氧代

Technologies Behind the Smart Grid and Internet of Things: A System Survey

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Computers, Materials & Continua 2023年第6期75卷 5049-5072页

作者： Kuldeep Sharma Arun Malik Isha Batra A.S.M.Sanwar Hosen Md abdul latif Sarker Dong Seog Han Department of Computer Science and Engineering Lovely Professional UniversityPunjabIndia Department of Artificial Intelligence and Big Data Woosong UniversityDaejeon34606Korea Center for ICT&Automotive Convergence Kyungpook National UniversityDaegu41566Korea School of Electronics Engineering Kyungpook National UniversityDaegu41566Korea

Electric smart grids enable a bidirectional flow of electricity and information among power system *** proper monitoring and con-trolling of power quality,reliability,scalability and flexibility,there is a need for an environmentally friendly system that is transparent,sustainable,cost-saving,energy-efficient,agile and *** paper provides an overview of the emerging technologies behind smart grids and the internet of *** dependent variables are identified by analyzing the electricity consumption patterns for optimal utilization and planning preventive maintenance of their legacy assets like power distribution transformers with real-time parameters to ensure an uninterrupted and reliable power *** addition,the paper sorts out challenges in the traditional or legacy electricity grid,power generation,transmission,distribution,and revenue management challenges such as reduc-ing aggregate technical and commercial loss by reforming the existing manual or semi-automatic techniques to fully smart or automatic *** article represents a concise review of research works in creating components of the smart grid like smart metering infrastructure for postpaid as well as in prepaid mode,internal structure comparison of advanced metering methods in present scenarios,and communication systems.

关键词： Electricity consumption bidirectional advanced meter infrastructure energy internet of things smart grid smart meter

Traffic Queuing Management in the Internet of Things: An Optimized RED Algorithm Based Approach

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Computers, Materials & Continua 2021年第1期66卷 359-372页

作者： abdul Waheed Naila Habib Khan Mahdi Zareei Shahab Ul Islam latif Jan Arif Iqbal Umar Ehab Mahmoud Mohamed Department of Information Technology Hazara UniversityMansehra21120Pakistan School of Electrical and Computer Engineering Seoul National UniversitySeoul08826Korea Department of Computer Science Institute of Management SciencesPeshawar25000Pakistan Tecnologico de Monterrey School of Engineering and SciencesZapopan45201Mexico Department of Computer Science IQRA National UniversityPeshawar25124Pakistan Department of Electrical Engineering University of Engineering TechnologyPeshawar25120Pakistan Electrical Engineering Department College of EngineeringPrince Sattam Bin Abdulaziz UniversityWadi Addwasir11991Saudi Arabia Electrical Engineering Department Faculty of EngineeringAswan UniversityAswan81542Egypt

Congestion control is one of the main obstacles in cyberspace *** in internet traffic may cause several problems;such as high packet hold-up,high packet dropping,and low packet *** the course of data transmission for various applications in the Internet of things,such problems are usually generated relative to the *** tackle such problems,this paper presents an analytical model using an optimized Random Early Detection(RED)algorithm-based approach for internet traffic *** validity of the proposed model is checked through extensive simulation-based *** analysis is observed for different functions on internet *** performance metrics are taken into consideration,namely,the possibility of packet loss,throughput,mean queue length and mean queue *** sets of experiments are observed with varying simulation *** experiments are thoroughly analyzed and the best packet dropping operation with minimum packet loss is identified using the proposed model.

关键词： Random early detection(RED) active queue management(AQM) quality of service(QOS) throughput

The corrosion scenario in human body: Stainless steel 316L orthopaedic implants

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Natural Science 2012年第3期4卷 184-188页

作者： Kean-Khoon Chew Sharif Hussein Sharif Zein abdul latif ahmad School of Chemical Engineering Engineering Campus Universiti Sains Malaysia Penang Malaysia

As the world’s populations increase and age, there is a parallel increase in the number of medical procedures addressed to bone related injuries. It is estimated that approximately 1 million of orthopaedic implant surgeries in association with total joint replacements are needed every year. This number is expected to double between 1999 and 2025 as a result of increasing numbers of musculoskeletal injuries (i.e., due to routine activities such as work, sport, etc.) and musculoskeletal diseases (i.e., such as osteoporosis, arthritis and bursitis due to increase age). Consequently, the increase demand for better quality of life has necessarily led people to opt for high quality orthopaedic devices for early recovery and speedy resumption of their routine activities. Unfortunately in the present time, it has been found that the current used orthopaedic implants have the tendencies to fail after long period of usage, due to the corrosion issue of implant in the human body. Therefore, this paper provides a simple overview about the corrosion issue of stainless steel (SS) 316L as implants in human body. Electrophoretic deposition (EPD) of hydroxypaptite (HA) bioceramic was proposed as the approach to minimize the corrosion phenomena. Additionally, the corrosion testing of HA coated SS 316L in comparison to pristine SS 316L was also performed and discussed.

关键词： Corrosion Metallic Implant Stainless Steel Electrophoretic Deposition Hydroxyapatite