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Mostofa Mahmud HASAN(Mostofa Mahmud HASAN ),BM Sajjad HOSSAIN(BM Sajjad HOSSAIN ),Md. Abu SAYEM(Md. Abu SAYEM ),Mahnaz AFSAR(Mahnaz AFSAR ) 한국유통과학회 2022 유통과학연구 Vol.20 No.11
Purpose: The purpose of this study was to determine the effect of agricultural exports and imports on economic growth in Bangladesh and propose an upgraded and customized model of the supply chain for agribusiness growth in Bangladesh to achieve plain sailing and systematic operation and financial gains at home and abroad. Research design, data, and methodology: All data in the research have been collected from secondary sources. Gross domestic product was used as the dependent variable and exports and imports of agricultural products were used as independent variables. Pairwise Granger causality was utilized to see the impact of the variable responsible for the economic growth in Bangladesh and the causal relationship between the variables analyzed was measured using Johansen co-integration test. Results: From the empirical analysis, the researchers observed that agricultural commodity imports and exports have a unidirectional impact on economic growth in Bangladesh and a long-run causal link with economic growth in Bangladesh. The suggested supply chain model of agnbusiness aids in achieving smooth operations, systematic management, and monetary gains both domestically and internationally. Conclusions: This paper contnbutes to the development of a more effective and profitable agribusiness supply chain in Bangladesh systematically through their theoretical and practical implications.
Computational fluid analysis of abrasive waterjet cutting head
Mostofa, Golam,Kwak, Yong-Kil,Ahn, Jung-Hwan 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
Waterjet cutting is an appealing technology for cutting thick materials with zones that must not be affected by heat. This paper presents computational fluid dynamics (CFD) and theoretical analyses to optimize the mixing of components by the multi-phase approach. Water, air, and abrasives are mixed in a mixing chamber. This modeling is used to predict the influence of air and abrasives on the mixing at different distances within the mixing tube. At the same time, particle tracking was conducted to monitor the erosion rate density at the nozzle wall. Results show that nozzle length has an effect on the mixing of water, air, and the abrasives, and that the velocity of the waterjet influences the erosion rate at the nozzle wall. The k-${\varepsilon}$ turbulence model was used for simulation of the abrasive coupled with air. This investigation reveals that the erosion in the nozzle body is higher at the initial zone and that as the length of the nozzle length increases, the volume fraction of air increases accordingly. The entrance of the orifice is affected by a highly pressurized water stream (with minimal particulate matter), which causes chipping at the leading edge. To reduce the turbulence inside the mixing chamber, the use of a vacuum assist could be helpful, but precautions should be taken in order that the abrasives do not escape from the mixing chamber.
Mostofa, Sk. Mamun,Mezbah-ul-Islam, Muhammad Korea Institute of Science and Technology Informat 2015 Journal of Information Science Theory and Practice Vol.3 No.4
Knowledge Management (KM) has become a fundamental process for all types of institutions in society. Academic libraries are also an integral part of the knowledge system, these institutions being one of the forms that contribute to knowledge development. This study aims to find out the challenges and opportunities associated with KM practices in Dhaka University Library (DUL). The specific objectives were to ascertain the understanding of KM concepts among library professionals of DUL, to explore an overview of KM and its role, and to identify the rationale behind not practicing KM properly at DUL. Appropriate methods were employed. The findings indicate that limited expertise and lack of clear guidelines are the major challenges for the implementation of KM in DUL.
Summarized bit batch-based triangle listing in massive graphs
Rasel, Mostofa Kamal,Elena, En,Lee, Young-Koo Elsevier science 2018 Information sciences Vol.441 No.-
<P><B>Abstract</B></P> <P>The presence of triangles in massive graphs provides many important uses in different graph algorithms, such as finding highly relevant vertices for dense subgraph mining, measuring the clustering coefficient, and computing the transitivity for network analysis. In-memory algorithms cannot be used for triangle listing in massive graphs because the graphs are too large to fit into memory. External memory-based techniques address this problem by focusing on the I/O efficiency to improve performance. However, triangulation is a CPU intensive process that iteratively joins lists of neighbors to determine the adjacent vertices in each triangle. Therefore, the cost of a triangle listing algorithm on a massive graph is dominated by the join operations among the lists of neighbors. In this paper, we propose a disk-based triangle listing approach that uses an efficient technique to join the lists of neighbors by exploiting CPU parallelism through bitwise operations. We represent the lists of neighbors using bit vectors and compress them using our proposed <I>summarized bit batch</I>, which allows the bitwise operations to be performed directly on the compressed data. Our proposed technique slices a bit vector into a series of <I>word length</I> bit batches that it summarizes by pruning the bit batches that contain only 0-bits. Then our proposed approach for listing the triangles asynchronously accesses the summarized bit batches and joins them using bitwise operations. Our proposed technique achieves 40% higher compression for some real world datasets compared to the classic compression technique. The triangulation technique using the summarized bit batches also significantly outperforms the existing solutions in terms of wall clock time.</P>
Tooling device design for vibration-assisted high speed shaping of PMMA
Md. Golam Mostofa,J. H. Noh,김화영,안중환,D. B. Kang 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.8
PMMA optical components that are used as one of the most important parts of high precision equipments and machines are increasingly replacing the glass due to the various advantages of PMMA. Especially in Light Guide Panels, the PMMA sheet that is used in Liquid Crystal Displays plays an important role in scattering the incident light and requires very fine machining as the sheet is directly related to the optical characteristics of the panels. The High Speed End milling and High Speed Shaping processes that are widely adopted and applied to the precise machining of Light Incident Plane still have quality problems, such as cracks, breakages, poor waviness,and straightness. This paper presents the tooling device design for machining a Light Incident Plane through vibration-assisted High Speed Shaping for increasing the optical quality by minimizing the above-mentioned problems. The cutting tool and the tool post presented in this paper are designed by the authors to increase the magnitude of the cutting stroke by adopting the resonant frequency without weakening the stiffness and to reduce vibrations during even high speed feeding. The dynamic characteristics of the cutting tool and the tool post are evaluated through simulation and experiment as well. The results reveal very appropriate dynamic characteristics for vibration-assisted High Speed Shaping.