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Fabrication of Planar Waveguide Chip for Splitting or Combining an Infrared Light Beam
Nguyen Thanh Binh,Nguyen Tat Thanh,Duong Thanh Trung,Nguyen Thanh Huong,Le Quoc Minh 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Based on hybrid materials of polymethamethyl acrylat, silica and zirconia (ASZ)/Titania (AST), some planar structures of optical power splitter/combiner type 1×N channels were designed and simulated for making masks by using computer software. Splitter chips were then fabricated by using the thin-film sol-gel technique and their structure was formed by using a direct photo-patterning method with UV light and a mask. A conformation of the waveguide was tested with an Alpha-Step IQ system. The waveguide properties of the splitter were measured with a 1550 nm laser source. The experimental results show that the light was transmitted through the chip with a total output efficiency of around 6% and was separated uniformly at the output channels. Based on hybrid materials of polymethamethyl acrylat, silica and zirconia (ASZ)/Titania (AST), some planar structures of optical power splitter/combiner type 1×N channels were designed and simulated for making masks by using computer software. Splitter chips were then fabricated by using the thin-film sol-gel technique and their structure was formed by using a direct photo-patterning method with UV light and a mask. A conformation of the waveguide was tested with an Alpha-Step IQ system. The waveguide properties of the splitter were measured with a 1550 nm laser source. The experimental results show that the light was transmitted through the chip with a total output efficiency of around 6% and was separated uniformly at the output channels.
Development of 3D CAM system for End mills manufacturing
Trung-Thanh Pham,Sung-Lim Ko,Yong-Hyun Kim 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The development of 3D CAM system for the manufacturing of end mills becomes a key approach to save the time and reduce cost for end mills manufacturing. This paper presents the calculation and simulation of end mill tools CNC machining bases on 5-axes CNC grinding machine tool. In this study describes the process of generation and simulation of grinding point data between the tool and the grinding wheels through the machined time. Depend on input data of end mill geometry, wheels geometry, wheel setting, machine setting the end mill configuration and NC code for machining will be generated and visualized in 3 dimension before machining. The 3D visualizations of end mill manufacturing was generated by using OpenGL in C++. The development software was designed by using Microsoft Visual C++, which has many advantages for users, saving time and reducing manufacturing cost.
Trung Thanh Pham,고성림(Sung Lim Ko) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The CAM software for drill grinding has been developed to save time, reduce cost for tool manufacturing and obtain accuracy of tool. In this paper, the developing software for drill will be presented including calculation and simulation of machining processes using 5-axes CNC grinding machine. The algorithm for helical flute grinding was applied into calculating NC data. The software will generate NC code for machining by using input data of tool geometry, wheel geometry, wheel setting, machine setting. These NC code files will be used in simulator as input file. The simulator provides some functions for simulating machining processes, inspecting and measuring tool geometry.
Trajectory analyses of uncontrolled circular parachutes in random spatial wind fields
Thanh Dong Pham,Anh Tuan Nguyen,Vu Dan Thanh Le,Trung Kien Nguyen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
The present paper explores the trajectories of two uncontrolled circular parachute models which differ in size and mass in random spatial wind fields. The wind velocity components were generated through three-dimensional inverse fast Fourier transforms; and the correlations of the simulation data compared with the theoretical functions to confirm the accuracy of the wind model. The parachute systems are modelled as six-degrees-of-freedom rigid bodies, on which the aerodynamic forces and moments are applied. The dynamics model was validated before being used to study the drop trajectories of the parachute systems in spatial wind fields. Analyzing the drop trajectories and the impact point dispersion characteristics of the two parachute systems, the paper shows that the smaller one oscillates at a higher frequency and is affected more strongly by the wind. While descending at low altitude, there could be resonance between the dynamics of the larger parachute model and the wind turbulence. Moreover, it is found that the use of simplified vertical wind profiles, which include only the variation of the wind velocity against the altitude, may cause significant error in the simulation results.
Thanh Nguyen Trung,Murthy Hosakatte Niranjana,Yu Kee-Won,Jeong Cheol Seung,Hahn Eun-Joo,Paek Kee-Yoeup The Korean Society of Plant Biotechnology 2004 Plant molecular biology and biotechnology research Vol.6 No.4
Cell growth and ginseng saponin production by large-scale suspension (bioreactor) cultures of Panax ginseng were investigated under various inoculum sizes. Cell growth was low at an inoculum size of 40 g FW/L, and the maximum cell growth was obtained with increasing inoculum size up to 100 g FW/L. The cell density of 333 g FW/L and 12.7 g DW/L was obtained at inoculum size of 100 g FW/L after 30 days of cultivation. Maximum saponin production of $4.40\;\cal{mg/g}$ DW was achieved at 60 g FW/L of inoculum size. Thus, inoculum size 60 g FW/L was suitable for optimum biomass accumulation as well as saponin production during bioreactor cultivation of ginseng suspension cells.
Trung Thanh Nguyen,Van-Tuan Tran,Minh-Thai Le 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.7
This work addresses a process parameter-based optimization of the electrical discharge drilling (EDD) of the hole to decrease the specific drilling energy (SDE), the dilation of the hole (DH), and the tapper ratio (TR). The input parameters are the applied current (AC), pulse on time (TON), pulse off time (TOFF), discharge voltage (VO), gap voltage adjustor (GAP), capacitance parallel connection (CAP), and servo sensitivity selection (SV). The adaptive neuro based-fuzzy inference system (ANFIS)-based models were proposed to render the relations between the process parameters and EDD performances. The weights between multi-responses are determined using the entropy method. The optimum factors were obtained by the neighborhood cultivation genetic algorithm (NCGA). The findings revealed that the proposed ANFIS models employing gaussmf membership function may help to minimize the predictive error. The optimal values of the AC, TON, TOFF, VO, GAP, CAP, and SV are 5 A, 60 μs, 50 μs, 60 V, 6, 7, and 7, respectively. The SDE, DH, and TR are reduced by 10.13%, 34.46%, and 11.63%, respectively, as compared to initial values. Moreover, a hybrid approach using the ANFIS model, entropy method, and NCGA is a prominent technique for modeling and optimizing different EDD processes.
Thanh Trung Thach,지준구,이상호 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.4
RAP80 plays a key role in DNA damage responses by recognizing K63-linked polyubiquitin moieties through its two ubiquitin-interacting motif (UIM) domains. The linker between the two UIMs possesses a phosphorylation site, but the relationship between phosphorylation and polyubiquitin recognition remains elusive. We investigated the interaction between a phosphorylation-mimic RAP80 mutant S101E and linear polyubiquitins, structurally equivalent to the K63-linked ones, using isothermal titration calorimetry (ITC). ITC analysis revealed differential binding affinities for linear tetraubiquitin by otherwise equivalent UIMs in S101E. Mutational analysis supported such differential polyubiquitin recognition by S101E. Our results suggest a potential crosstalk between polyubiquitin recognition and phosphorylation in RAP80.
Optimization of the Burnishing Process for Energy Responses and Surface Properties
Trung-Thanh Nguyen,Le-Hai Cao 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.6
In the current work, the optimal factors are selected to achieve the improvements in the energy consumption (EB), power factor (PB), decreased roughness (DR) and improved surface hardness (IH) for the roller burnishing operation. The process inputs are the burnishing speed ( V ), the feed (f ), and the depth ( d ). A hybrid approach comprising the principal component analysis and Technique for Order of Preference by Similarity to Ideal Solution was used to explore the weight values of burnishing performances and select the optimum parameters. Moreover, another optimization technique employing the response surface method and archive-based micro-genetic algorithm was adopted to identify the optimal outcomes in the continuous domain. The main fi ndings showed the performances measured are primarily aff ected by the burnishing feed, depth and speed, respectively. The energy consumption and roughness are approximately decreased by 31.46% and 7.41%, while the power factor and hardness are improved by 17.47% and 43.09%, respectively, as compared to the general process. The outcomes and fi ndings of the investigated work can be used for further research in sustainable design and manufacturing as well as directly used in the knowledge-based and expert systems for burnishing applications in industrial practices.
Micropropagation from root segments to improve seedling quality in Chinese foxglove crops
Thanh Loan Pham,Van Huy Nguyen,Thi Le Thu Hoang,Thi Tam Tien Ha,Trung Kien Tran,Xuan Duong Vu,Phi Bang Cao,Quang Trung Nguyen 한국식물생명공학회 2020 JOURNAL OF PLANT BIOTECHNOLOGY Vol.47 No.3
This is the first study to establish a complete protocol for micropropagation of Rehmannia glutinosa from root segments. The study involved investigating the effect of plant growth regulators on in vitro shoot regeneration and rooting and identifying substrates supporting survival and growth performance of ex vitro seedlings. A Murashige and Skoog (MS) medium containing 30 g/L sucrose for shoot induction and 0.2 mg/L indole-3-acetic acid (IAA), 1 mg/L 6-benzylaminopurine (BAP), and 1 g/L polyvinylpyrrolidone (PVP) for shoot multiplication resulted in the highest number of shoots per explant and shoot height. Applying a medium containing 0.5 mg/L IAA and 1 g/L PVP yielded optimal rooting of the shoots grown in vitro. Compost enriched with microbial inoculants and perlite enhanced seedling growth better than that with organic biofertilizer-free substrates (soil and sand). We recommend the continuous production of micropropagated R. glutinosa seedlings from root segments under the aforementioned conditions as a possible propagation technique for crops of this species.