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The Welfare and Sectoral Adjustment Effects of Mega-Regional Trade Agreements on ASEAN Countries
Le Tien Dat 한국무역학회 2017 한국무역학회 국제학술대회 Vol.2017 No.11
When developing training programs, the perceptions of trainees with regard to how to organize and delivery the training should be investigated. Factors relating to the training programs, such as the length of the program, the number of sessions, and most importantly the target audiences are considered to have significant effect to the training effectiveness perceived by participants. Potential issues with training delivery and administration should always be gauged and addressed, as not doing so may negatively impact on the training effectiveness. This paper investigates the perceptions of Vietnamese small and medium-sized enterprise (SME) potential and current exporters with regard to the delivery and organization of training programs on international managerial skills. Given the importance of Vietnamese SMEs in supporting sustainable, diversified and long-term economic growth, a wide range of policies and programs have been developed to support SMEs. However, to improve the effectiveness of these training programs, aspects with regard to training organization and delivery should be highly considered to meet the actual needs of SME managers. In this study, the perceptions of SME managers were explored by using qualitative interviews with 58 SME managers in three big cities of Vietnam, including Hanoi, Da Nang and Ho Chi Minh City (HCMC). The research outcomes are expected to be helpful for SMEs, training providers and government agencies in organizing suitable training programs for SMEs. Further, the study is also expected to make contribution to the body of knowledge on human resources (HR) development of SME sector in developing countries.
Tien Manh Huynh,Quang Dinh Le,Nhan Quang Le,Huy Minh Le,Duc Trong Quach 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.4
Background/Aims: Accurate neoplastic prediction can significantly decrease costs associated with pathology and unnecessary colorectal polypectomies. Narrow-band imaging (NBI) and dual-focus (DF) mode are promising emerging optical technologies for recognizing neoplastic features of colorectal polyps digitally. This study aimed to clarify the clinical usefulness of NBI with and without DF assistance in the neoplastic prediction of small colorectal polyps (<10 mm). Methods: This cross-sectional study included 530 small colorectal polyps from 343 consecutive patients who underwent colonoscopy at the University Medical Center from September 2020 to May 2021. Each polyp was endoscopically diagnosed in three successive steps using white-light endoscopy (WLE), NBI, and NBI-DF and retrieved for histopathological assessment. The diagnostic accuracy of each modality was evaluated with reference to histopathology. Results: There were 295 neoplastic polyps and 235 non-neoplastic polyps. The overall accuracies of WLE, WLE+NBI, and WLE+NBI+NBI-DF in the neoplastic prediction of colorectal polyps were 70.8%, 87.4%, and 90.8%, respectively (p<0.001). The accuracy of WLE+NBI+NBI-DF was significantly higher than that of WLE+NBI in the polyp size ≤5 mm subgroup (87.3% vs. 90.1%, p<0.001). Conclusions: NBI improved the real-time neoplastic prediction of small colorectal polyps. The DF mode was especially useful in polyps ≤5 mm in size.
Le, Xuan The,Pham, Dung Tien,Pham, Tuan Anh,Tran, Tung Thanh,Khuat, Thanh Huu,Le, Hoa Quang,Vu, Ut Ngoc The Korean Society of Fisheries and Aquatic Scienc 2019 Fisheries and Aquatic Sciences Vol.22 No.8
Bacillus is a diverse genus consisting of more than 200 species with extensive genetic diversity. Their beneficial effects in industrial shrimp farming have been well documented. However, little is known about the biodiversity of the Bacillus spp. in this aquaculture system. Taxonomic analysis by 16S rRNA sequencing does not always allow species-level identification of Bacillus spp. In this study, 26 Bacillus isolates from two industrial Litopenaeus vannamei shrimp ponds in Bac Lieu Province, Vietnam, were analyzed for their genetic diversity by multi-locus sequence typing (MLST). A total of 22 sequence types were identified and segregated into four distinct clusters, corresponding to B. subtilis, B. velezensis, B. siamensis, and B. licheniformis. Bacillus subtilis and B. velezensis accounted for more than 73% of the Bacillus isolates. Notably, the MLST scheme exhibited high discriminatory power and might be further simplified to be a convenient method to identify species of the genus Bacillus.
Le, Dung Tien,Lee, Byung Cheon,Marino, Stefano M.,Zhang, Yan,Fomenko, Dmitri E.,Kaya, Alaattin,Hacioglu, Elise,Kwak, Geun-Hee,Koc, Ahmet,Kim, Hwa-Young,Gladyshev, Vadim N. American Society for Biochemistry and Molecular Bi 2009 The Journal of biological chemistry Vol.284 No.7
<P>Methionine sulfoxide reductases (Msrs) are oxidoreductases that catalyze thiol-dependent reduction of oxidized methionines. MsrA and MsrB are the best known Msrs that repair methionine-S-sulfoxide (Met-S-SO) and methionine-R-sulfoxide (Met-R-SO) residues in proteins, respectively. In addition, an Escherichia coli enzyme specific for free Met-R-SO, designated fRMsr, was recently discovered. In this work, we carried out comparative genomic and experimental analyses to examine occurrence, evolution, and function of fRMsr. This protein is present in single copies and two mutually exclusive subtypes in about half of prokaryotes and unicellular eukaryotes but is missing in higher plants and animals. A Saccharomyces cerevisiae fRMsr homolog was found to reduce free Met-R-SO but not free Met-S-SO or dabsyl-Met-R-SO. fRMsr was responsible for growth of yeast cells on Met-R-SO, and the double fRMsr/MsrA mutant could not grow on a mixture of methionine sulfoxides. However, in the presence of methionine, even the triple fRMsr/MsrA/MsrB mutant was viable. In addition, fRMsr deletion strain showed an increased sensitivity to oxidative stress and a decreased life span, whereas overexpression of fRMsr conferred higher resistance to oxidants. Molecular modeling and cysteine residue targeting by thioredoxin pointed to Cys(101) as catalytic and Cys(125) as resolving residues in yeast fRMsr. These residues as well as a third Cys, resolving Cys(91), clustered in the structure, and each was required for the catalytic activity of the enzyme. The data show that fRMsr is the main enzyme responsible for the reduction of free Met-R-SO in S. cerevisiae.</P>
Adaptive Neural Network Second-order Sliding Mode Control of Dual Arm Robots
Le Anh Tuan,주영훈,Le Quoc Tien,Pham Xuan Duong 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
An adaptive robust control system is considered for dual-arm manipulators (DAM) using the combinationof second-order sliding mode control (SOSMC) and neural networks. The SOSMC deals with the system robustnesswhen faced with external disturbances and parametric uncertainties. Meanwhile, the radial basis function network(RBFN) is to constitute an adaptation mechanism for approximating the unknown dynamic model of DAM. Thestability of model estimator-integrated controller is analyzed using Lyapuov theory. To show the effectiveness ofproposed controller, a four DOFs-DAM is applied as an illustrating example. The results reveal that the controllerworks well, excellently adapt to no information of robot modeling.
Parameter Estimator Integrated-sliding Mode Control of Dual Arm Robots
Le Anh Tuan,주영훈,Pham Xuan Duong,Le Quoc Tien 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
This paper presents the parameter estimator-integrated sliding mode control of dual arm robots. Todo so, a robust adaptive controller is designed for 3D cooperative motion of dual-arm robots based on the frameof second-order sliding mode control (SOSMC). Additionally, the method of the model-reference adaptive control(MRAC) is also utilized for constituting an adaptation mechanism then integrating it into the control loop to estimatethe unknown robot parameters. By doing so, the proposed controller is robust with disturbances and parametricuncertainties. Furthermore, the adaptive behavior is also achieved in which the control system does not need theinformation of many system parameters. Finally, the applicability and feasibility of the proposed controller ispresented through a 4 four degree-of-freedoms (DOFs) dual-arm manipulator.
Tien H. Le Nguyen,Phuoc H. Vo Luong Techno-Press 2023 Ocean systems engineering Vol.13 No.3
The vertical distribution of suspended sediments in the mangrove-mud coast is complicated due to the characterization of cohesive sediment properties, and the influence of hydrodynamic factors. In this study, the time-evolution of suspended sediment concentration (SSC) in water depth is simulated by a one-dimensional model. The model applies in-situ data measured in October 2014 at the outer station in Cu Lao Dung coastal areas, Soc Trang, Vietnam. In the model, parameters which have influence on vertical distribution of SSC include the settling velocity Ws and the diffusion coefficient Kz. The settling velocity depends on the cohesive sediment properties, and the diffusion coefficient depends on the wave-current dynamics. The settling velocity is determined by the settling column experiment in the laboratory, which is a constant of 1.8 × 10<sup>-4</sup> ms<sup>-1</sup>. Two hydrodynamic conditions are simulated including a strong current condition and a strong wave condition. Both simulations show that the SSC near the bottom is much higher than ones at the surface due to higher turbulence at the bottom. At the bottom layer, the SSC is strongly influenced by the current.