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Scientific and technological journals in Vietnam: the current state and direction of development
Banh Tien Long,Nguyen Duc Toan 한국과학학술지편집인협의회 2015 Science Editing Vol.2 No.1
Vietnam is on its way to becoming a more developed country and more integrated into the global community. One of the most important key factors for development is science and technology. Scientific publications bring the most up-to-date information to scientists, researchers, and society. The quality of Vietnam’s scientific journals should be increased to international level. Also, the number of high quality articles published in international journals from Vietnam is limited compared to the number of researchers in Vietnam. There is still no Vietnamese journal indexed in Web of Science up to January 2015; while, three journals has been indexed in Scopus. This article discusses the current scenario of scientific and technological journals in Vietnam and the trend of development to international level.
A Flexible Solid 3D Model Reconstruction System for Mechanical CAD /CAM Systems
Long Hoang,Long Banh Tien 한국정밀공학회 2019 한국정밀공학회지 Vol.36 No.8
Three-dimensional CAD models are usually used by designers because of their applications in the areas of CAD/CAM/CAE/CAQ. A desirous trend to create this model, long been studied by scientists globally, is 3D model reconstruction from views. With this method, geometric information can be easily entered as well as using existing 2D drawings. Most of the previous studies used three views, but many of the common parts needed only two views. A flexible reconstruction system that responds to both forms is the subject of this study. The proposed method has been installed and tested by an ADSRX program running on AutoCAD software. The 3D model results have been checked for the compatibility with CAD/CAM systems.
Bui Van-Bien,Banh Tien-Long,Nguyen Duc-Toan 한국정밀공학회 2019 한국정밀공학회지 Vol.36 No.8
From 2010, the first version of Microsoft Kinect, a low-cost RGB-D camera, was released which used structured light technology to capture depth information. This device has been widely applied in many segments of the industry. In July 2014, the second version of Microsoft Kinect was launched with improved hardware. Obtaining point clouds of an observed scene with high frequency being possible leads to imaging its application to meeting the demand of 3D data acquisition. However, evaluating device capacity for mechanical part modeling has been a challenge needed to be solved. This paper intends to enhance acquired depth maps of the Microsoft Kinect v2 device for mechanical part modeling and receive an assessment about the accuracy of 3D reconstruction. Influence of materials for mechanical part modeling is also evaluated. Additionally, experimental methodology for 3D modeling of the mechanical part is finally reported to ascertain the proposed model in this paper.
Nguyen Huu-Phan,Banh Tien-Long,Le Quang-Dung,Nguyen Duc-Toan,T. Muthuramalingam Korean Society for Precision Engineering 2019 한국정밀공학회지 Vol.36 No.9
Powder mixed electrical discharge machining (PMEDM) is a new machining technology. The optimization of process parameters in PMEDM is being researched. The determination of the value of the weights of quality indicators in a multiobjective optimization problem is often complex and difficulty. Preferential selection index (PSI) is a new computational technique for solving multi-objective problems. This contributes to the process of solving the multi-objective optimization problems. In this study, material removal rate (MRR) and surface roughness (SR) were optimized with the help of the PSI method. The specimen and tool materials, electrode polarity, current, pulse-on-time, pulse-off-time and powder concentration were considered. The investigation showed that powder concentration can increase MRR with lower SR. The most significant factor was the electrode material. The optimal values were found as SKD11 (workpiece), Gr (tool), + (polarity), 5 ㎲ (ton), 57 ㎛ (toff), 8A (current) and 10 g/l (powder concentration) with a high accuracy of 7.82%. The electrode material and powder concentration could provide strong influence on the performance measures owing to their importance on determining spark energy in the PMEDM. The research results were compared with those of TOPSIS, GRA and MOORA methods. In conclusion, PSI is the method for the highest efficiency.
Thi-Bich Mac,Tien-Long Banh,Duc-Toan Nguyen Korean Society for Precision Engineering 2019 한국정밀공학회지 Vol.36 No.9
In this work, we present an experimental study on cutting force and chip shrinkage coefficient during the milling of SKD11 steel at elevated temperatures using a high-frequency induction heating method. To improve the determination of the chip shrinkage coefficient, a 3D scanning method incorporating GOM Inspect 3D data analysis software was used to measure the chip length. To evaluate the effect of the heating process on output data such as chip geometry, cutting force, and chip shrinkage coefficient, cutting experiments were conducted at room and elevated temperatures with the same machining parameters of cutting speed, feed rate, and cutting depth. The Taguchi orthogonal array method was subsequently used for experimental design to obtain optimum values of the machining parameters. The analysis of variance method was also performed to indicate the percentage effect of the machining parameters on the cutting force and chip shrinkage coefficient. Finally, models of the cutting force and chip shrinkage coefficient during thermal-assisted milling of SKD11 were established and compared with experimental data.