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Communications in Theoretical Physics 2018年第1期69卷 107-114页

作者： M.Sarker B.Hosen M.R.Hossen A.A.mamun Department of Physics Jahangirnagar University Department of General Educational Development Daffodil International University

The heavy ion-acoustic solitary waves(HIASWs) in a magnetized, collisionless, space plasma system(containing dynamical heavy ions and bi-kappa distributed electrons of two distinct temperatures) have been theoretically investigated. The Korteweg-de Vries(K-dV), modified K-dV(MK-dV), and higher-order MK-dV(HMK-dV) equations are derived by employing the reductive perturbation method. The basic features of HIASWs(viz. speed, polarity,amplitude, width, etc.) are found to be significantly modified by the effects of number density and temperature of different plasma species, and external magnetic field(obliqueness). The K-dV and HM-Kd V equations give rise to both compressive and rarefactive solitary structures, whereas the MK-dV equation supports only the compressive solitary structures. The implication of our results in some space and laboratory plasma situations are briefly discussed.

关键词： heavy ion acoustic waves solitary waves superthermal electrons higher order nonlinear equations

Backward Support Computation Method for Positive and Negative Frequent Itemset Mining

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Journal of Data Analysis and Information Processing 2023年第1期11卷 37-48页

作者： Mrinmoy Biswas Akash Indrani Mandal Md. Selim al mamun Department of Computer Science and Engineering Jatiya Kabi Kazi Nazrul Islam University Mymensingh Bangladesh

Association rules mining is a major data mining field that leads to discovery of associations and correlations among items in today’s big data environment. The conventional association rule mining focuses mainly on positive itemsets generated from frequently occurring itemsets (PFIS). However, there has been a significant study focused on infrequent itemsets with utilization of negative association rules to mine interesting frequent itemsets (NFIS) from transactions. In this work, we propose an efficient backward calculating negative frequent itemset algorithm namely EBC-NFIS for computing backward supports that can extract both positive and negative frequent itemsets synchronously from dataset. EBC-NFIS algorithm is based on popular e-NFIS algorithm that computes supports of negative itemsets from the supports of positive itemsets. The proposed algorithm makes use of previously computed supports from memory to minimize the computation time. In addition, association rules, i.e. positive and negative association rules (PNARs) are generated from discovered frequent itemsets using EBC-NFIS algorithm. The efficiency of the proposed algorithm is verified by several experiments and comparing results with e-NFIS algorithm. The experimental results confirm that the proposed algorithm successfully discovers NFIS and PNARs and runs significantly faster than conventional e-NFIS algorithm.

关键词： Data Mining Positive Frequent Itemset Negative Frequent Itemset Association Rule Backward Support

A Survey on Matching of Shoeprint with Reference Footwear in Forensic Study

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Journal of Computer and Communications 2019年第9期7卷 19-26页

作者： Md. al mamun Morium Akter Mohammad Shorif Uddin Department of Computer Science and Engineering Jahangirnagar University Savar Bangladesh

Footwear impression marks on the outside surface of shoes are distinctive patterns and an important forensic clue often found at offense scenes. However, in many cases, the footwear mark is treated with improper evidence due to difficulties in visibility and understanding. This paper presents a thorough review of matching algorithms along with enhancement techniques of shoeprint in the forensic study. Finally, it shows some research directions.

关键词： Forensic Study Footwear Shoeprint Feature Extraction Segmentation

Cylindrical and Spherical Electron-Acoustic Shock Waves in Electron-Positron-Ion Plasmas with Nonextensive Electrons and Positrons

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Communications in Theoretical Physics 2015年第2期63卷 243-248页

作者： A.Rafat M.M.Rahman M.S.alam A.A.mamun Department of Physics Jahangirnagar University

Electron-acoustic shock waves （EASWs） in an unmagnetized four-component plasma （containing hot elec- trons and positrons following the q-nonextensiv.e distribution, cold mobile viscous electron fluid, and immobile positive ions） are studied in nonplanar （cylindrical and spherical） geometry. With the help of the reductive perturbation method, the modified Burgers equation is derived. Analytically, the effects of nonplanar geometry, nonextensivity, relative number density and temperature ratios, and cold electron kinematic viscosity on the basic properties （viz. amplitude, width, speed, etc.） of EASWs are discussed. It is exarmined that the EASWs in nonplanar geometry significantly differ from those in planar geometry. The results of this investigation can be helpful in understanding the nonlinear features of EASWs in various astrophysical plasmas.

关键词： electron-acoustic shock waves electron-positron-ion plasmas modified Burgers equation nonpla-nar geometry nonextensivity

A Bayesian framework for adsorption energy prediction on bimetallic alloy catalysts

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npj Computational Materials 2020年第1期6卷 195-205页

作者： Osman mamun Kirsten T.Winther Jacob R.Boes Thomas Bligaard SUNCAT Center for Interface Science and Catalysis Department of Chemical EngineeringStanford UniversityStanfordCA 94305USA SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory2575 Sand Hill RoadMenlo ParkCA 94025USA DTU Energy Department of Energy Conversion and StorageAnker Engelunds VejBuilding 3012800 Kgs.LyngbyDenmark

For high-throughput screening of materials for heterogeneous catalysis,scaling relations provides an efficient scheme to estimate the chemisorption energies of hydrogenated ***,conditioning on a single descriptor ignores the model uncertainty and leads to suboptimal prediction of the chemisorption *** this article,we extend the single descriptor linear scaling relation to a multi-descriptor linear regression models to leverage the correlation between adsorption energy of any two pair of *** a large dataset,we use Bayesian Information Criteria(BIC)as the model evidence to select the best linear regression ***,Gaussian Process Regression(GPR)based on the meaningful convolution of physical properties of the metal-adsorbate complex can be used to predict the baseline residual of the selected *** integrated Bayesian model selection and Gaussian process regression,dubbed as residual learning,can achieve performance comparable to standard DFT error(0.1 eV)for most adsorbate *** sparse and small datasets,we propose an ad hoc Bayesian Model Averaging(BMA)approach to make a robust *** this Bayesian framework,we significantly reduce the model uncertainty and improve the prediction *** possibilities of the framework for high-throughput catalytic materials exploration in a realistic setting is illustrated using large and small sets of both dense and sparse simulated dataset generated from a public database of bimetallic alloys available in ***.

关键词： adsorption scaling bimetallic

Effect of Planting Methods on the Yield and Yield Attributes of Short Duration <i>Aman</i>Rice

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American Journal of Plant Sciences 2014年第3期5卷 251-255页

作者： Md. Masud Rana Md. abdullah al mamun Afruz Zahan Md. Nayeem Ahmed Md. Abdul Jalil Mridha Adaptive Research Division Bangladesh Rice Research Institute Gazipur Bangladesh Agronomy Division Bangladesh Rice Research Institute Gazipur Bangladesh Soil Science Division Bangladesh Rice Research Institute Gazipur Bangladesh

To find out the effect of planting methods on the yield and yield attributes of short duration Aman rice varieties, a field trial was conducted at the farm of Bangladesh Rice Research Institute, Gazipur, during July to November 2012. The treatments comprised of three BRRI released high yielding varieties viz., BRRI dhan39, BRRI dhan49 and BRRI dhan57 and three planting methods viz., direct seeding of dry seed, direct seeding of sprouted seed and transplanting. It was a factorial experiment conducted in a Randomized Complete Block Design with three replications. Planting methods had a significant effect on the growth duration of rice. The rice crop established with direct seeding of the dry and sprouted seed matured 7 days earlier than transplanting. The variety BRRI dhan39 gave the highest yield (4.964 t·ha-1) when grown with direct seeding of sprouted seed compared to other varieties. The highest net return (23362.00 BDT ha-1) and cost benefit ratio (1:1.49) were observed in direct seeding of the sprouted seed method. So, direct seeding of sprouted seed might be the best planting method because about 19.94% production cost is reduced due to the omission of seedling raising and transplanting operations as well as the reduction in the length of the crop cultivation period.

关键词： Direct Seeding of Dry and Sprouted Seed Growth Duration Short Duration Aman Rice

Prevalence and Associated Factors of Anemia among Pregnant Women Receiving Antenatal Care (ANC) at Fatima Hospital in Jashore, Bangladesh: A Cross-Sectional Study

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Food and Nutrition Sciences 2019年第9期10卷 1056-1071页

作者： Suzon Ahmed Md. abdullah al mamun Niaz Mahmud Nisat Farzana Mosammat Sadia Akther Sathi Biplob Kumar Biswas Amit Datta Tanvir Ahmad Department of Nutrition and Food Technology Faculty of Applied Science and Technology Jashore University of Science and Technology Jashore Bangladesh

Since anemia is one of the most skyrocketed public health problems worldwide, an investigation has thus been conducted to assess the prevalence and associated factors of anemia among the pregnant women receiving antenatal care (ANC) at Fatima Hospital in Jashore, Bangladesh. Facility-based cross-sectional study was carried out among 384 pregnant women at Fatima hospital, Bangladesh from February to April, 2019. Data were obtained using a structured questionnaire and participant’s current medical record card. Binary logistic regression analysis was used to identify factors associated with anemia and a P-value ally significance. The overall prevalence of anemia among pregnant women was 58.9% (226/384). Out of 226 anemic pregnant mothers, 36.3% (82/226) were mildly anemic, 62.4% (141/226) were moderately anemic and 1.3% (3/384) was severely anemic. Binary logistic regression analysis revealed that the following variables were significantly associated with anemia: Monthly family income (11,000 - 20,000 Taka) [AOR (95% CI) = 0.45 (0.21 - 0.98)], Family size (joint) [AOR (95% CI) = 1.59 (1.03 - 2.45)], Gestational age (third trimester) [AOR (95% CI) = 2.18 (1.40 - 3.40)], birth spacing alence of anemia among pregnant women is severe at Fatima Hospital in Jashore, Bangladesh.

关键词： Anemia Antenatal Care (ANC) Socio-Demographic Characteristics Maternal Characteristics Dietary Characteristics Nutritional Characteristics

Burden and outcome of human influenza in a tertiary care hospital of Bangladesh

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Asian Pacific Journal of Tropical Medicine 2011年第6期4卷 478-481页

作者： Rasul CH Bakar MA mamun AA Siraz MS Zaman RU Department of Paediatrics Khulna Medical College & HospitalKhulnaBangladesh Department of Medicine Khulna Medical College & HospitalKhulnaBangladesh International Center for Diarrhoeal Disease Research Bangladesh

Objective:To determine the magnitude and outcome of influenza in southern part of Bangladesh and also to identify intrusion of novel influenza ***:This study was conducted for two years(2008-2009) in outpatient and inpatient department of both paediatrics and medicine discipline of Khulna Medical College *** and throat swab specimens were collected from each influenza like illness(ILI) case and kept together in a virus transport media and transported to international centre for diarrhoeal disease and research,Bangladesh laboratory. Influenza virus was detected by rRT-PCR including types and ***:A total of 526 patients were enrolled during the study period with the mean(SD) age of 19(17) years. Identification of influenza virus was 14%and positive cases were mostly found in under-five children(24%).The vast majority(88%) of influenza cases were found during April to September. Virus detection rate was higher in inpatient department(IPD)(21%) than in outpatient department (12%).The dominant virus type and subtype was influenza A(87%) and H3(49%),respectively. Type A was significantly higher than type B in causing severe illness compared to ILI(0R=7.04, 95%CI:2.76-18.7,Palized cases majority(77%) recovered completely except two cases that needed referral for additional ***: Influenza mostly affected under-five children and young *** peak season here was late summer and rainy season.

关键词： Influenza Burden Outcome Bangladesh

Antidiabetic and antioxidant activities of methanol extract of Syzygium operculatum(Roxb.)***

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Journal of Coastal Life Medicine 2015年第5期 372-378页

作者： Md.Mizanur Rahman Ahmmed Rusti Foysol Anaytulla Md.Masudur Rahman Mohammed Aktar Sayeed Md.abdullah-al-mamun Mohammad Mustakim Department of Pharmacy International Islamic University ChittagongChittagong-4203Bangladesh

Objective:To evaluate the antidiabetic and antioxidant effects of the methanol extract of Syzygium operculatum bark(MSOB)using in vivo and in vitro ***:Antidiabetic activity was assessed by using alloxan induced(120 mg/kg body weight)diabetic *** plant extract(200 mg/kg and 400 mg/kg body weight)was administrated *** diabetic mice in comparison with standard metformin hydrochloride(150 mg/kg body weight).The antioxidant activity of the extract was evaluated by using a range of in vitro assays and results were compared to ***:The extract MSOB 200 mg/kg and 400 mg/kg reduced the blood glucose level 44.05%and 55.53%respectively where the standard drug metformin reduced 69.42%in dose of 150 mg/kg body *** extract MSOB showed significant 1,1-diphenyl-2-picrylhydrazyl scavenging activity,total phenol content,total flavonoid content and reducing power capacity compared to *** IC_(50)values were found 300.34μg/mL in 1,1-diphenyl-2-picrylhydrazyl radical scavenging assay where 40.31μg/mL for ascorbic *** total phenol and flavonoid contents were 197.5 and 267.5 mg of gallic acid equivalent per gram,***:The present study indicates that the extract of Syzygium operculatum bark is the potential sources of natural antioxidant and possesses significant antidiabetic activities.

关键词： Syzygium operculatum Niedz Methanol extract Antihyperglycemic alloxan Antioxidant DPPH

Influence of waning immunity on vaccination decision-making:A multi-strain epidemic model with an evolutionary approach analyzing cost and efficacy

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Infectious Disease Modelling 2024年第3期9卷 657-672页

作者： Md.mamun-Ur-Rashid Khan Jun Tanimoto Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityKasuga-koenKasuga-shiFukuoka816-8580Japan Faculty of Engineering Sciences Kyushu UniversityKasuga-koenKasuga-shiFukuoka816-8580Japan Department of Mathematics University of DhakaDhaka1000Bangladesh

In this research,we introduce a comprehensive epidemiological model that accounts for multiple strains of an infectious disease and two distinct vaccination *** stands out as the most effective means to prevent and manage infectious ***,when there are various vaccines available,each with its costs and effectiveness,the decision-making process for individuals becomes ***,the factor of waning immunity following vaccination also plays a significant role in influencing these *** understand how individuals make decisions in the context of multiple strains and waning immunity,we employ a behavioral model,allowing an epidemiological model to be coupled with the dynamics of a decision-making *** base their choice of vaccination on factors such as the total number of infected individuals and the cost-effectiveness of the *** findings indicate that as waning immunity increases,people tend to prioritize vaccines with higher costs and greater ***,when more contagious strains are present,the equilibrium in vaccine adoption is reached more ***,we delve into the social dilemma inherent in our model by quantifying the social efficiency deficit(SED)under various parameter combinations.

关键词： Multistrain epidemic model Vaccination Behavior dynamics Waning immunity Social dilemma