The measured brain signals are affected by various interference sources and should be removed to obtain a clean brain signal. Most research works of removing noises from brain signals have performed based on offline filtering techniques such as low-pass filtering, wavelet filtering, ICA (independent component analysis), etc., which did not meet the real time application requirements in peripheral control based on brain signals. Thus, in this research, we use an adaptive filtering algorithm based on recursive least squares estimation (RLSE) to eliminate interference for EEG signal (electroencephalography). First, a simulation of brain signal and known noise mix together. Then, use an adaptive filtering algorithm based on RLSE to reduce noise and reconstruct the simulation of brain signal. After that, this algorithm will be apply to the real EEG signal from the EPOC (Emotiv). Finally, the results will to compare with low-pass filter and wavelet filter. Experimental results showed that the adaptive filtering algorithm based on RLSE is better than low-pass filter and wavelet filter. In particular, the adaptive filtering algorithm based on RLSE can apply adaptive brain signal in real time while the wavelet filter can’t do so.

Utilization of solar energy is an effective solution for a company to reduce dependence on fossil energy and CO2 emissions. Therefore, this study presents a green supply chain network design problem considering solar rooftop photovoltaic systems (PVs) to minimize total cost and CO2 emissions occurred during production and transportation activities. Net present value (NPV) is used to evaluate and verify the feasibility of installing PVs for different facility sizes. Following this analysis, a mixed integer linear programming model (MILP) is proposed to determine facility location, the amount of transportation between components in supply chain (SC). The capability of the model and the methodology are then applied for a case study of garment mannufacturer located in the Mekong Delta region, Viet Nam. Results showed that adopting PVs creates huge benefits in energy cost savings and CO2 emissions reducion for the whole supply chain.

Nowadays, PID controller have been used to regulate a process in most of the industrial control systems. This is commonly designed by the Ziegler-Nichols tuning method. However, this method has the disadvantage that it depends on actual processes, so it is difficult to find optimal parameters of the controller by manual turning. This paper is to proposes a combination of a fuzzy controller to generate a signal to compensate for the PID controller, so called fuzzy-PID controller. The characteristics of the Fuzzy-PID controller are illustrated with simulation results in the control of direction and speed of a snake robot. Simulation results were implemented basing on  MATLAB/Simulink software  as follows The overshoot, rise time and setting time of the system with fuzzy-PID controller are superior to those of the PID controller. Besides, the controller also responded to noise interference on the systems.

Supplier selection can be considered as one of the most important action, which contributes to the success of supply chain management in a company. To select appropriate suppliers, business owners need to use systematic and effective approaches. This study proposes an integrated approach of Fuzzy-TOPSIS to evaluate suppliers. The methodology allows of objective supplier evaluation under consideration of different criteria in an uncertainty environment. A case study in Thanh Phu Plastic Packaging Company was applied to illustrate the proposed methodology. The result allows companies to select appropriated suppliers to improve business performance as well as supply chain performance.

The main purpose of wind energy system is to achieve the maximum power from air flows. The maximum power point tracking (MPPT) method is used to gain the maximum power from many different wind speeds. This paper presents a way to find the maximum power point of PMSG wind generator by using “Perturb and Observe” (P&O) algorithm. The maximum power and wind turbine system are based on rotor speed achieved. The proposed model is designed and simulated in MATLAB/Simulink. The simulation result shows that this is the optimal technique, improving efficiency of system.

Publication of research is the ultimate and significant step to recognize scientific work. However, in the submission system with a wide range of subjects (e.g. Association for Computing Machinery with 2,000 subjects), it may take the authors a lot of time to classify a manuscript into an appropriate group of subjects before it is submitted to a journal or conference. Therefore, this article is aimed to propose automatic solutions to extract information and categorize scientific papers on suitable topics. The experiments was based on the data set of scientific articles published in Can Tho University Journal of Science. The input data were pre-processed, extracted, vectorized and classified using three machine learning techniques including support vector machines, Naïve Bayes, and k-nearest neighbors. The experimental results showed that with the accuracy of over 91%, support vector machines technique proved its feasibility for developing the automatic classification system of scientific papers.

Soc Trang is a coastal province in the Vietnamese Mekong Delta. Groundwater is the main source for urban water supply systems of the province; however, both the quality and quantity of this water source are declining. Therefore, shifting from groundwater to surface water exploitation plays an important role in the sustainable water supply for the province. Methods of the statistics in water resources and compare with the Vietnamese national standards for surface water quality (QCVN 08-MT: 2015/BTNMT) were applied to evaluate salinity and pollutants of the surface water source in the province. The result shows Hau river and its distribuaries in Ke Sach District were less affected by the salinity and pollutants comparing different regions of the province. Besides, the polluted parameters, are often found in the surface sources in the district, are BOD, COD, TSS, total Coliform and total iron pollutants. The study result also reveals the water quality of Hau river, Cai Vop, Cai Tram, So 1 canal and the upstream of 30/4 canal has the water pollution frequency less than the others in the province. These rivers and canals can be considered as the water sources supplying for Soc Trang city.

The study was conducted to provide a picture of the status of species diversity and distribution of seaweed around Nam Du archipelago, Kien Giang province. In two survey trips from July 29 to August 09, 2017 and from April 22 to May 3, 2018, using field survey method of deep diving with scubas, combining with photographing, sampling, classifying by comparative morphological method, 96 seaweed species belonging to 35 families, 20 orders of 4 seaweed phyla were identified. Among them, Rhodophyta phylum was the highest abundant population with 44 species; followed by Chlorophyta (25 species), then Phaeophyta (23 species) and ended by Cyanophyta (4 species). The study results also recorded 43 economic seaweed species; 1 species of endangered, precious and rare seaweed needs priority protection. Seaweed system in Nam Du archipelago was tropical (P = 3.0); the similarity index was medium (S = 0.35). Seaweeds usually distribute into narrow strips on the islands. The species Tubinaria decurrens - prevails and have high frequency of occurrence with over 95% at survey stations and over 50% of biomass there.

based on the improvements in building universe set, the relation of each element in series and the principle for defuzzification, this paper is to propose a time series interpolating model. The parameters in the proposed model are considered so that they can be applied in reality and are illustrated for specific steps by the numerical example. The proposed model has more advantages than some existing models by a lot of the considered benchmark data. It is also applied in forecasting salty peak for a coastal province in the Mekong Delta. This application also shows the potential of the proposed model in forecasting.

Scaffold - a porous structure is an important component in tissue engineering, because it supports the formation of 3D structure. Therefore, this study was conducted to fabricate scaffold from polylactic acid (PLA). Nonsolvent induced phase separation method (NIPS) was applied and important factors affecting the formation of scaffold such as solvent types, polymer concentration, temperature of solvent system, the ratio of ethanol/water, and the ratio of solvent/nonsolvent (v/v) were investigated. Experimental results showed that when increasing the concentration of polymer and the water content in the nonsolvent were reducing pore size of scaffold. In contrast, when increasing the temperature and the ratio of solvents/nonsolvent were increasing the pore size of scaffold. Scaffold in the pore size of 42.4 μm could be prepared at condition of PLA 150 g/L, 40 ºC, the ethanol to water volume ratio of 96/4, the solvent/nonsolvent volume ratio of 1/20. In addition, the results of mechanical tests showed that tensile strength of scaffold decreased as the pore size increased. Tensile strength of scaffold in pore size of 42.4 μm was 65.5 MPa and its specific surface area was 25.7 m²/g.

The objective of this study was to isolate antibacterial endophytic bacteria from Physalis angulata L. Samples of roots, stems, leaves and fruits of Physalis angulata L from Ninh Kieu District in Can Tho City were used as materials to isolate bacteria. Antibacterial activity was tested by disc diffusion method. The results showed a total of 62 antibacterial endophytic bacteria were isolated from Physalis angulata L. Twenty five strains had the ability against Aeromonas hydrophila, 20 strains were  active  against  Escherichia  coli, and 13 strains  showed  antibacterial  activity against Staphyloccocus aureus. In addition, the results of the test about antibiotic resistance ability of the best 12 antimicrobial strains showed that 12 tested strains were able to resist to Streptomycin at various concentration varied from 0.125 to 256 mg.L-1. Eleven strains were able to resist to Penicillin V at various concentration ranked from 0.125 to 0.5 mg.L-1 and eight out of 12 strains showed their resistant to Cephalexin at various concentration varied between 0.125 to 256 mg.L-1. Based on recording of 16S rRNA gene sequences, these three bacterial strains including DL19, DR7 and DTR12 belong to Bacillus, Enterobacter and Bacillus and have a closest relationship to Bacillus amyloliquefaciens NBRC 15535, Enterobacter cloacae DSM 30054 and Bacillus subtilis IAM 12118, respectively.

Aspergillus is one of the strong cellulose degrading microorganisms. This study was done to select Aspergillus spp. strains for waste harvested mushroom hydrolyzing ability assay by isolating, selecting, identifying and applying of cellulose degrading activity of Aspergillus spp. From the result, 65 strains of the genus Aspergillus were isolated and initially classified from five sources of rhizophere soil, rice-field soil, rotten straw (O Mon), bagasse (Hau Giang), sawdust (Can Tho). Two strains namely BM-CMC-6 and DR-GL-9 showed the highest cellulase activity by giving strongest cellulolytic activity on inductive substrates such as bagasse, rice-straw or filter paper. These strains also showed the highest activity of endoglucanses and β-glucosidases. Combination of BM-CMC-6 and DR-GL-9 strains revealed as a potential product in treating bagasse obtained from mushroom harvest with the C/N ratio (27,48) and reduced weight (31,57%) of the bagasse after hydrolyzed 15 days. Hyphae characteristics and the DNA sequences indicated BM-CMC-6 belonged to A. niger and DR-GL-9 was A. tubingensis.

Cashew apple juice contains high minerals, vitamins and sugar content suitable for wine fermentation. This study investigated effects of Brix degree (19-25), pH (4-5) and yeast content (5-10%) to alcohol content of cashew apple wine. The response surface methodology in a central composite design of experiment was applied to determine the optimal conditions for the main of cashew apple wine fermentation process. The results showed that Brix degree effected strongest to alcohol content. The alcohol content of 12.1% v/v was obtained at the optimal conditions of 22o Brix, pH = 4.5 and yeast of 7.5% vol. There was no difference detected (p

The study aimed to investigate the use of pesticides in vegetable production in Thua Thien Hue Province, in which a social practice approach was employed. Data collectionwas based on both qualitative and quantitative methods. Three communes were selected for this study, including Quang Thanh, Huong An, and Dien Hai. The results show that up to 84.5 % of the vegetable farmers were under secondary education. All the interviewed farmers applied pesticides to their vegetable crops. Up to 20 different active ingredients were utilized for vegetable production at the study sites, in association with incidents of overdose application. Neither age, educational level or gender are the main impact factors to the pesticide use of local farmers. The practices on pesticide use were mainly based on the experience of individuals or oral communications. There were few farmers only having knowledge on pesticide toxicity as well as awareness of environmental protection, expressed by an indifference to labor protection, or improper pesticide storage and waste disposal that might cause unexpected harmful issues to the environment and to the farmers themselves.

The study was carried out to identify the brand of Ly Son garlic (Allium sativum L.) in Quang Ngai province by using morphological characteristics of bulbs and molecular markers. Six garlic accessions were collected from local farms and supermarkets including Ly Son, Phan Rang, Khanh Hoa, Lam Dong and Hai Duong and China. A total of 10 morphological and structural characteristics of garlic bulbs and 5 markers has been evaluated. The results showed that Ly Son garlic was distinct from garlic of Hai Duong, Lam Dong and China based on the color of bulb skin, bulb diameter, root zone diameter. However, there were many similar characteristics between Ly Son bulb garlic and Phan Rang, Khanh Hoa garlic. Therefore, it was necessary to evaluate the number of cloves per bulb, bulb diameter and root zone diameter. Ly Son garlic had 19.8 ± 3.7 cloves; bulb diameter - 2.79 ± 0.2 cm; root zone diameter - 1.11 ± 0.09 cm. The cpSSR and cpSTR markers designed in the present study only allow distinguishing between Ly Son garlic and Phan Rang, Lam Dong, Khanh Hoa, Chinese garlic. Application of molecular markers confirmed the genetic homogeneity of Ly Son and Khanh Hoa garlic.

The program of developing cacao-coconut intercrop farming is expected to boost the income of farmers in Tien Giang province. However, in recent years, farmers are facing many challenges such as increasing in disease infestation, low yield, and cacao price fluctuation. Consequently, farmers do not want to continue planting cacao. This study aims to analyze factors affecting the responses of cacao-coconut intercropping farmers to the cacao price fluctuation in Tien Giang province using The multinomial logit model. Data for the analysis were obtained through a structured survey with 212 cacao farmers conducted in Cho Gao, Go Cong Tay, and Tan Phu Dong districts. Results of the study showed that farmers have three main responses to the cacao price fluctuations, namely: maintaining their cacao area, partially cutting the cacao area, and cutting all of their cacao area. Factors that significantly affecting the responses of farmers include the rate of contribution of income from cacao farming, the area of coconut cultivation, the expectation on the rise of cacaoselling price in the future, the number of family labors, and pest and disease infestation.

This study was conducted to determine theappropriate feed for maturation culture and spawning induction method on black sea urchin Diadema setosum. Two experiments were conducted. In the first experiment, sea urchins were fed with three different diets including  (1) Seaweed Gracilaria sp., 2) pellet feed, and 3) the combination of sea weed and pellet feed. For the second experiment, four different spawning inductions of injection 1.0 mL KCl (0.5M), temperature shock, UV shock and H2O2 methods were employed to induce spawning of black sea urchin. The result showed that the average survival rate was above 50% in all diets of the first experiment after 90 days. The highest GSI (7.08±2.95%) was found for those animal fed with pellet feed and was significantly different (P

This study was conducted to determine the efficacy of inactivated Streptococcus agalactiae vaccine on tilapia (Oreochromis niloticus) fingerling. The experiment is a completely randomised design with three replications of four treatments where fish were vaccinated with 0.05, 0.1, 0.2 ml vaccine/fish and non-vaccinated (control). Three weeks after vaccination, fish were challenged with S. agalactiae and followed-up for 3 weeks post challenge to determine the relative percentage survival rate (RPS%). Blood samples were collected every week to analyse hematological parameters and specific antibody concentration. The results showed that inactivated S. agalactiae vaccine has immunostimulatory effect in tilapia and lasting at least 4 weeks post vaccination. The hematological parameters and specific antibody concentration in vaccinated fish were statistically significantly higher (P

This study aim to determine effects of R. communis L. extract on the immune response and resistance to V. parahaemolyticus of the white leg shrimp (P. vannamei). The shrimp was reared with commercial feed mixed with 0; 0.5%; 1% and 2% R. communis extract for 60 days. The total haemocyte count (THC), the differential haemocyte count (DHC), phenoloxidase (PO) activity and superoxide dismutase (SOD) activity of the supplemented experiment at 30-day and 60-day treatment. The resistance to V. parahaemolyticus of P. vannamei were examine somebody in the 60 day treatment. The results showed that (i) THC, DHC and PO activity in the supplemented treatments were higher than in the control treatment in the 30th day and 60th day; however, the supplemented treatment of 1.0% was the highest (P

This research is aimed to find suitable density for growth and survival rate of black tiger shrimp larvae and postlarvae (PL) using biofloc technology. The experiment is completely randomized design with three replications of four treatments which are stocking densities of 150, 200, 250, and 300 larvae/liter. The biofloc medium in composite tanks is 500 L water at 30‰ salinity modified with molasses at C/N ratio of 25:1. The results showed that the environmental factors, bacterial density, bioflocs during rearing in treatment of 150 and 200 larvae/litter were appropriate for the development of larval and postlarval tiger shrimp. At treatment of 150 larvae/litter yielded significantly higher PL-15 length (12.37±0.21 mm), and survival (61.2±4.3%) (p0.05). Production (112,515±7,118 PL/m3) in treatment of 200 larvae/litter was significantly higher (p0.05). It can be concluded that nursing larvae of the black tiger shrimp in biofloc system at 200 larvae/litter is the most suitable.

The study is carried out to describe and compare histopathological characteristics of bacillary necrosis disease in striped catfish (Pangasianodon hypophthalmus) and red tilapia (Oreochromis sp.).  Diseased samples of striped catfish and red tilapia were collected from cultured ponds/cages and from the experimental infection with Edwardsiella ictaluri. Both diseased striped catfish and red tilapia exhibited the same pathological signs such as stop feeding, lethargic swimming, appearance of round white spots with a diameter of 0.5-3 mm in the internal organs (liver, kidney and spleen). The results of histopathological analysis showed similar characteristics in two fish species, including: (1) many areas of liver, kidney and spleen tissues of diseased fishes displayed congestion, hemorrhage, necrosis and structural changes, (2) pigmented macrophage centers increased in number and size on kidney and spleen tissue. In diseased red tilapia, there were many lipid vacuoles in liver tissue and granulomas on the kidney and spleen.

This study was conducted to evaluate the effects of dietary Bacillus subtilis and fructooligosaccharides (FOS) on immune response and disease resistance of red tilapia (Oreochromis sp.). The experiment was in a completely randomized design with 4 treatments including control; B. subtilis (107 CFU/g); B. subtilis (107 CFU/g) and 0.2% FOS; B. subtilis (107 CFU/g) and 0.5% FOS. Sampling was conducted after the fish fed diets containing B. subtilis and FOS for 2 weeks, 4 weeks and after 3 days of infection with Streptococcus agalactiae. The result of hematology showed that the total erythrocyte, leukocyte, monocytes, neutrophils, lymphocytes and lysozyme activity were significantly increased (p

The study was conducted to evaluate effects of oxytetracycline on immune parameters and susceptibility of white leg shrimp (Litopenaeus vannamei) to acute hepatopancreatic necrosis disease (AHPND). Shrimp (2.8 ± 0.48 g/shrimp) were randomly distributed (30 shrimp/tank) with four treatments (TM) (in triplicate): (TM1) unchallenged control; (TM2) challenged control; (TM3) unchallenged and fed diet coated with oxytetracycline (2 g/kg for 5 days); and (TM4) challenged and fed diet coated with oxytetracycline (for 5 days after challenge). After 14 days challenge, cumulative mortality in TM2 (48.9 ± 1.9%) was significantly higher (P

A study on fish species composition and abundance in the lower areas of Bassac River was conducted for 6 months, from March 2017 to August 2017. The fish samples were collected by using bottom trawl nets. The results showed that 84 species belonging to 36 families and 12 orders were identified. Perciformes is the most diverse order with 33 species accounting for 39%, followed by the Siluriformes with 14 species (17%) and Cypriniformes with 10 species (12%). Salinity has affects on the fish species composition. The results also indicated that catch per unit effort (CPUE) was relatively low and fluctuated through the sampling sites and times. CPUE increased from freshwater sites (1,075±750 g/ha) to estuarine sites (1,795±1,578 g/ha). CPUE was lowest in April with 684± 66 g/ha and highest in August with 2,535±2510 g/ha.

The study is aimed to optimize the stocking density for growth and survival rate of mudskipper (Pseudapocryptes elongatus) in biofloc systems. The experiment design was completely randomized with three replications of four stocking density including:  100, 200, 300 and 400 inds/m3. Fish were stocked in 0.5 m3 tanks containing 0.35 m3 of 15‰brackish water in biofloc system (C:N ratio =15:1). The body weight and length of initial fish was 2.07±0.04 gand 8.17±0.36 cm, respectively. After 56 days of culture, the body length and weight of fish at 100 and 200 inds/m3 were higher, FCR lower and were significantly different (p0.05). Fish biomass at 200 inds/m3 was 2.6 kg/m3, was not significantly different compared to 300 and 400 inds/m3, but significantly different compared to 100 ind/m3 (1.3 kg/m3). In conclusion, tank culture of mudskipper applied bio-floc technology at stocking density of 200 inds/m3 was appropriate.

This study is aimed to evaluate the growth, survival rate, production and quality of the oysters originated from Ben Tre, Tra Vinh and Ca Mau provinces. Oysters were cultured in extensive shrimp pond at Dam Doi district, Ca Mau province. Oyster seeds  with shell length from 8-9 cm were cultured in the net frame at the density of 140 individuals/m2. After 7 months of culture, the survival rate of Ca Mau oysters was higher than that of Ben Tre and Tra Vinh oysters but there was not significant difference (p>0.05). Growth rate in shell length, total weight and production of Ca Mau oysters obtained highest results (20.84 kg/m2, followed by Ben Tre oyster (20.04 kg/m2) and the lowest in Tra Vinh oysters (19.15 kg/m2).The results of the evaluation of oyster quality showed that appearance of shell and meat color of fresh oysters were not significantly different among oysters from the three origins (p>0.05). Results from this study showed that oysters originated from Ben Tre and Tra Vinh provinces can be cultured commercially in extensive shrimp pond at Dam Doi district, Ca Mau province although the growth rate and production was lower than the local oysters.

A total of 137 fishing households, 5 trawlers, 5 gillnets and 8 fishing purchasing agents were to be interviewed to collect data on the production composition in Kien Giang province. The results showed that trawlers and gill nets could provide fishing products whole year round. The yield and trash fish of gill nets were 3.1 ± 2.2 tons/year (16.8%) and for the trawlers were 39.4 ± 15.9 tons/year (22.8%). The harvested products of the trawlers were mainly sold to the purchasing agents of 96.9%; and purchasing agents sold 47.9% of fishery products to the processing factories. For the gill nets, the products were mainly sold (90.5%) to purchasing agents and purchasing agents sold 44.8% of products to processing factories. The rest products were for retailers. The annual profit of purchasing agents was 6.6 ± VND 1.1 billion per year with benefit ratio of 0.19. Most of the purchasing agents encountered the greatest difficulty in terms of unstable prices, which made it difficult for both fishermen and purchasing agencies.

The effects of chitosan films with lime leaf extract on the quality of knifefish paste (Chitala chitala) at cold storage (4±1ºC) were examined. The results showed that the ratio 1:1.5 of leaf and distilled water (w/v) reached the highest antioxidant activity based on the total polyphenol content (170 mgGAE/g), flavonoid compounds (63.2 μgQE/g) and the free radical DPPH inhibition (IC50= 171 µg/mL). After 15 days of storage, the control samples (wrapped in chitosan film only) and the samples wrapped in 4% lime leaf extract added chitosan film maintained the sensory qualification (11.8 and 13.8, respectively) and the total microbial in permission limit (8.17x105 and 6.69x105 cfu/g, respectively). The results of peroxide value (PV) analysis indicated that PV of the treated samples by 4% lime leaf extract added chitosan film chitosan film (0.607 meq/kg) was lower than the control samples (1.29 meq/kg) after 12 days of reservation. The combination of chitosan film and natural compounds extracted from plants can extend the storage time of fish paste products.

Homestay is a type of sustainable tourism that brings many benefits as creating new experiences for tourists, ensuring livelihood and income for the locals. Therefore, homestay tourism is a new and promising trend in many countries around the world. An Bien district (Kien Giang province) has lots of potentials to develop homestay tourism with the typical characteristics of a coastal area. However, the strengths in the area only exist in the form of potential, not yet be exploited in association with tourism to generate income for the people and develop the local economy. Therefore, this study is aimed to analyze the potentials of homestay tourism in An Bien district, Kien Giang province; thereby providing some orientations for homestay models and solutions to overcome shortcomings to develop homestay tourism in the area effectively as well as to improve the quality of people's lives and to strengthen rural construction towards sustainable development.

Sea-island tourism is one of the unique types of tourism in Kien Giang province. Especially, Nam Du archipelago and Lai Son island (Kien Hai district) are attractive destinations of tourists, not only domestic but also international. However, what attracting tourists to sea-island tourism in this area has not been well studied. Therefore, this study is aimed to evaluate such attracting factors of Kien Hai district, Kien Giang province. The method of descriptive statistics and exploratory factor analysis (with SPSS 20.0) used to analyze the data collected from 130 tourists. This study outcomes indicated that there are nine factors that attract tourists to sea-island tourism at Kien Hai district, Kien Giang province: (1) hygiene and no price challenged; (2) price; (3) entertainment; (4) humans; (5) tourism resources; (6) accommodation, restaurant and wharf; (7) roads and transportation; (8) advertisement and promotion policies; (9) safety and security. Based on outcomes, some suggestions were proposed to attract more tourists in the future.

The paper is aimed to analyse law and regulation on right to appeal and scope of right to appeal of defendant in the Criminal Proceduce Code of 2015. Shortcomings with respect to this issue were pointed out. On that basis, suggestions were proposed to improve revelant law and regulation.