Dhaka University Journal of Science最新文献_第6页

An Artificial Neural Network Method for Managing Inventory of A Fertilizer Company in Bangladesh 孟加拉某化肥公司库存管理的人工神经网络方法

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60022

M. B. Hasan, Lipi Akhter

{"title":"An Artificial Neural Network Method for Managing Inventory of A Fertilizer Company in Bangladesh","authors":"M. B. Hasan, Lipi Akhter","doi":"10.3329/dujs.v69i3.60022","DOIUrl":"https://doi.org/10.3329/dujs.v69i3.60022","url":null,"abstract":"Business organizations are always facing uncertainties in demand, supply and inventories. For this, it is important for them to make the strategic plans to cope up with the uncertainty accordingly. To sustain, the business organizations must plan the future in such a way that the inventory cost, labor cost will be minimized and the utilization of time, financial resources and profit will be maximized. The optimum planning of resources also help the organizations to avoid wastage. A good forecasting technique can help the manager of a company to deal with the uncertainties. In this paper, we will work on such a planning fora fertilizer company in Bangladesh. To minimize the inventory cost, we will apply a new approach known as Artificial Neural Network (ANN), which is recently used for the problem of prediction and analyze the main characteristics of a system through an iterative training process. For this, we will first forecast the demand of fertilizer by using existing forecasting methods. We will then apply ANN for forecasting the demand of fertilizer of the company. We will also identify Economic Order Quantity (EOQ) to minimize total cost including inventory costs of the company. We use programming language MATLAB for analyzing different forecasting methods including ANN. Finally, we will use these results to find out the right forecasting technique for the fertilizer company with optimal inventory cost.\u0000Dhaka Univ. J. Sci. 69(3): 133-142, 2022 (June)","PeriodicalId":11280,"journal":{"name":"Dhaka University Journal of Science","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76870293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Benefits of Green-Space Exposure on Fifteen Health Outcomes: A Meta-Analysis 接触绿色空间对15项健康结果的益处:一项荟萃分析

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60023

Md. Hasibul Islam, M. B. Hossain

引用次数: 0

Blur Face Recognition using Blur Metric and Some Variants of Supervised Distance Preserving Projection 基于模糊度量和监督距离保持投影的模糊人脸识别

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60025

Mohiuddin Muhi, S. Jahan, Md. Anwarul Islam Bhuiyan

{"title":"Blur Face Recognition using Blur Metric and Some Variants of Supervised Distance Preserving Projection","authors":"Mohiuddin Muhi, S. Jahan, Md. Anwarul Islam Bhuiyan","doi":"10.3329/dujs.v69i3.60025","DOIUrl":"https://doi.org/10.3329/dujs.v69i3.60025","url":null,"abstract":"This paper is focused on face recognition techniques in uncontrolled scenarios, specifically on the recognition of face images with blur effects. At first, the blur level of the testing image is determined using recently proposed blur metric. This blur metric value is used to blur the training set of gallery images using Gaussian filter. The blur level of training images is the same as that of the testing image. Two variants of Supervised Distance Preserving Projection (SDPP), SDPP as Semidefinite Least Square (SLS-SDPP) and Regularized Supervised Distance Preserving Projection (RSDPP), are used for extracting effective features of training and testing images. K-Nearest Neighbor classifier is used for matching. Numerical experiments were carried out on two benchmarking face data ORL and Yale. The performances of SLS-SDPP and RSDPP are compared with one of the leading methods Eigenface method. Experimental results show that the combination of blur metric and the feature extraction methods achieved outstanding performance in recognizing blur images of different levels and also outperforms the base methods and Eigenface method.\u0000Dhaka Univ. J. Sci. 69(3): 154-160, 2022 (June)","PeriodicalId":11280,"journal":{"name":"Dhaka University Journal of Science","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89984679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Temperature and Solvents on the Thermodynamical and Electronic Properties of N-acetyl-para-aminophenol (APAP): A Computational Study 温度和溶剂对n -乙酰-对氨基苯酚(APAP)热力学和电子性质影响的计算研究

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60021

M. Alauddin

{"title":"The Effect of Temperature and Solvents on the Thermodynamical and Electronic Properties of N-acetyl-para-aminophenol (APAP): A Computational Study","authors":"M. Alauddin","doi":"10.3329/dujs.v69i3.60021","DOIUrl":"https://doi.org/10.3329/dujs.v69i3.60021","url":null,"abstract":"Effects of temperature and solvents on the thermodynamical and electronic properties of N-acetyl-para-aminophenol (APAP) have been investigated using density functional theory (DFT) and time dependent density functional theory (TD-DFT). Calculated results shows that thermodynamic properties such as enthalpy (H), entropy (S) and specific heat capacity (Cv) are increased by the raising of temperature (100 K-1200 K) because of enhancing the intensities of molecular vibration. On the contrary, change of Gibb’s free energy (ΔG) has been decreased with the increase of temperature. FMO energy gap is enlarged by solvation and therefore APAP becomes more stable in solution especially in polar solvents. Moreover, solvation increases the magnitude of ionization potential, electron affinity, electronegativity, chemical potential and global hardness. Two UV absorption maxima (λmax1 and λmax2) are found at 243.08 nm and 193.85 nm which are originated from phenyl and amide chromophore, respectively. The calculated λmax1 and λmax2 agree quite well with the available experimental data. On the other hand, calculated results reveal that solvation blueshifts the electronic absorption spectraas well as enhances the absorption intensity significantly.\u0000Dhaka Univ. J. Sci. 69(3): 125-132, 2022 (June)","PeriodicalId":11280,"journal":{"name":"Dhaka University Journal of Science","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87072796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Lyapunov Mappings and Analysis of a Nonlinear Spatio-temporal Epidemic Model 一类非线性时空流行病模型的Lyapunov映射与分析

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60026

M. Kamrujjaman, Md. Saiful Islam, Md. Shahidul Islam

引用次数: 0

An Orbital Free Ab-initio Molecular Dynamics Study of Liquid Pt for Static and Dynamic Properties 液态铂的静态和动态性质的无轨道ab -从头算分子动力学研究

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60028

M. R. Molla, GM Bhuiyan, A. Ahmed

{"title":"An Orbital Free Ab-initio Molecular Dynamics Study of Liquid Pt for Static and Dynamic Properties","authors":"M. R. Molla, GM Bhuiyan, A. Ahmed","doi":"10.3329/dujs.v69i3.60028","DOIUrl":"https://doi.org/10.3329/dujs.v69i3.60028","url":null,"abstract":"Using the orbital free ab-initio molecular dynamics (OF-AIMD) simulation scheme we have examined the static and dynamic properties of liquid Pt at the thermodynamic state near to its melting point. In this simulation scheme, the Hohenberg and Kohn orbital free density functional theory (OF-DFT) has been employed. In OF-DFT, we have estimated the electron-ion interaction by a local pseudopotential and also controlled the exchange-correlation energy functional by using the local density approximation (LDA). The static properties, for instance, static structure factor, S(q), pair correlation function, g(r), coordination number, Nc, and isothermal compressibility, κT, are examined. Using the familiar single-particle dynamics, the self-diffusion coefficient and self-intermediate scattering function are studied. It is found that the self-intermediate scattering function is controlled by the selfdiffusion coefficient. While for studying the collective dynamics of the system, we have calculated velocity of sound from the longitudinal dispersion relation and shear viscosity from the transverse current correlation function, JT(q, t). The OF-AIMD results are nicely fit with the theoretical and experimental results accessible to us for comparison.\u0000Dhaka Univ. J. Sci. 69(3): 179-185, 2022 (June)","PeriodicalId":11280,"journal":{"name":"Dhaka University Journal of Science","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81552944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Carbon Nanoparticles from Candle and Their Characterization by Advanced Spectroscopic Methods 蜡烛炭纳米颗粒的制备及其先进的光谱方法表征

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60032

Mohammad Abul Hossain, Shahidul Islam

引用次数: 1

Effects of Mixed Convection and Radiation Parameter on MHD Heat Transfer Flow over a Curved Stretching Sheet 对流和辐射混合参数对弯曲拉伸板上MHD换热流动的影响

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60027

M. Ferdows, M. Murtaza, M. Bangalee, M. Hossain

引用次数: 1

The Sensitivity of Initial Condition and Horizontal Resolution on Simulation of Tropical Cyclone Amphan over the Bay of Bengal using WRF-ARW Model WRF-ARW模式模拟孟加拉湾热带气旋安潘的初始条件和水平分辨率敏感性

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60031

Md Shakil Hossain, Md Abdus Samad, Md. Saddam Hossain, SM Arif Hossen, Md. Asraful Islam, S. Hassan

{"title":"The Sensitivity of Initial Condition and Horizontal Resolution on Simulation of Tropical Cyclone Amphan over the Bay of Bengal using WRF-ARW Model","authors":"Md Shakil Hossain, Md Abdus Samad, Md. Saddam Hossain, SM Arif Hossen, Md. Asraful Islam, S. Hassan","doi":"10.3329/dujs.v69i3.60031","DOIUrl":"https://doi.org/10.3329/dujs.v69i3.60031","url":null,"abstract":"Simulation of Super Cyclonic Storm (SuCS) Amphan (2020) has been carried out as a case study to analyze the sensitivity of Initial Condition (IC) and Horizontal Resolution (HR) on the intensity, track, and landfall predictions of the Tropical Cyclones (TCs). The results suggest that the IC and HR have a significant impact on TC simulations. Diminishing the HR in simulation results in a comparatively higher severity of the system. The simulation with a reduced lead time and a comparatively smaller HR has forecasted the Minimum Central Pressure (MCP) distribution reasonably well. In comparison to the observations, the reduced lead time model run with higher resolution has forecasted the Maximum Sustained Wind Speed (MSWS) distribution precisely. According to the statistical analysis, the continual reduction of lead time in simulation with the HR of 27 km has simulated better track and landfall positions than other resolutions. Thus, the combination of reduced lead time and higher resolution in simulation may be considered for the proper track and landfall forecasting.\u0000Dhaka Univ. J. Sci. 69(3): 202-211, 2022 (June)","PeriodicalId":11280,"journal":{"name":"Dhaka University Journal of Science","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81837245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

ZnO-TiO2 Composite Mediated Photocatalytic Degradation of Orange G from Aqueous Solution ZnO-TiO2复合材料光催化降解水溶液中的橙G

Dhaka University Journal of Science Pub Date : 2022-07-04 DOI: 10.3329/dujs.v69i3.60033

Farhana Hossain, M. Rahman, M. Hossain

引用次数: 0