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PublicationEffects of Several Organic Extracts on the Growth, Yield and Quality of Anoectochilus Formosanus Biomass( 2018)Anoectochilus formosanus is a high economic value herbal remedy, the oldest in herbal medicine. Nowadays, A. formosanus has been applied in many products of caring human health. However, A. formosanus in nature have slow growth characteristics, restrictive adapting conditions and susceptible to fungal diseases. Application of plant tissue culture technology can help to produce a large amount of A. formosanus biomass in controllable conditions. To be able to use A. formosanus biomass for serving human, plant growth regulators should not be used because of their disadvantageous affected on production quality. This topic surveys the effects of some organic extracts, using traditional plant tissue culture, on growing ability, yield and quality of A. formosanusbiomass. Some residual minerals which are useless for our health, such as NO3-, heavy metals (Cu, Zn, etc.) were also investigated for evaluating the quality of A. formosanusbiomass. After 60 days of culture, media supplementing with coconut water, yeast extract or Spirulina extract separately influenced positively to the growth and development of in-vitro A. formosanus. Yeast extract with the concentration of 2 g/l obtained the highest results in all targets, average height of explant was 11.69 cm/explant, average fresh weight was 2.57 g/explant. Contents of NO3-, Cu2+, Zn2+ are lower than the allowed threshold of FAO in all treatments. This study also examines the influence of culture density effecting on the yield capacity of A. formosanus. Results showed that, when cultured at a density of 10 explants per sigma box, their growth and development were better than others, achieved 251.44 g/L (total biomass/medium)
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PublicationNhân tố ảnh hưởng đến quyết định chọn mua thực phẩm sạch của người tiêu dùng tại Tp. Hồ Chí Minh( 2018)Bài viết xác định những nhân tố ảnh hưởng đến quyết định chọn mua thực phẩm sạch của người tiêu dùng tại TP. Hồ Chí Minh từ đó đo lường xác suất của người tiêu dùng khi quyết định chọn mua. Nghiên cứu cho thấy, quyết định chọn mua thực phẩm sạch của người tiêu dùng tại TP. Hồ Chí Minh vẫn còn rất thấp vì sự hoài nghi về thực phẩm trên thị trường cũng như sự hiểu biết về thực phẩm sạch chưa sâu sắc. Kết quả nghiên cứu cho thấy có 4 nhân tố ảnh hưởng đến quyết định chọn mua thực phẩm sạch tại TP. Hồ Chí Minh, đó là: Truyền thông, đặc điểm thực phẩm sạch, Xã hội và Nhận thức cá nhân. Bài viết đưa ra một số khuyến nghị đối với Nhà nước và doanh nghiệp nhằm nâng cao quyết định tiêu dùng thực phẩm sạch.
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PublicationDownlink Resource Allocation Maximized Video Delivery Capacity over Multi-hop Multi-path in Dense D2D 5G Networks( 2020)One of the significant challenges to 5G networks is how to serve a proliferation of dense mobile users (MUs) various video applications and services (VASs) at high delivery capacity under a scarcity of resources. In this paper, we exploit the resources of dense MUs to establish a set of device-to-device (D2D) multi-hop multi-path (MHMP) communications that can assist the macro base station (MBS) to offload the videos. Particularly, there are three types of MUs including cellular MUs (CUs), source MUs (SUs), and relay MUs, which are willing to share the downlink spectrum resources, provide the cached videos, and forward the videos, respectively. A downlink resource allocation for D2D MHMP communications (DRA-DMC) optimization problem is formulated to find the optimal allocation pairs of CUs and D2D hops in each path from the SUs to a destination MU (DU). Consequently, the DU can receive the videos flexibly from both the MBS and the SUs over D2D MHMP communications by reusing the downlink resources of the CUs, at maximum delivery capacity. Simulation results are performed to demonstrate the benefits of the DRA-DMC solution compared to other conventional schemes.
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PublicationThe Application of Metacognitive Strategies in Computer-Assisted Listening Comprehension Class( 2021)Computer-Assisted Language Learning (CALL) in listening comprehension courses has long been proved effective in enhancing EFL learner's listening proficiency as it creates enough space for students to individualize their learning process. However, it is a need to provide students appropriate strategies to help them overcome various difficulties in their listening practice. This quasi-experimental research aims at investigating the influence of metacognitive strategies on EFL learner's listening comprehension performance in CALL listening class. Forty-nine Vietnamese English major freshmen from two intact classes at Van Lang University, participated in the study. During the 10-week listening comprehension course, learners in the experimental group were instructed to use metacognitive strategies, while those in the control group received no strategy instruction. The collected data from the pre-test and post-test were analyzed by t-test using SPSS software. Students were also required to complete the Metacognitive Awareness Listening Questionnaire (MALQ), adopted from Vandergrift (2004). The findings suggested that metacognitive strategy instruction positively affects students' listening comprehension competence.
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PublicationDiscovery & Perceptions of Champa: the Đồng Dương Complex of Quảng Nam Province, Vietnam( 2021)Typical scholarly portrayals of the Đồng Dương site refer to a “Buddhist Monastery” of the classical Champā civilization, found in present-day Vietnam. French Orientalist research has strongly shaped scholarly focus on the monastery itself for the past century, informing the most recent English language scholarly production. However, more recent Vietnamese scholarship has begun to revise this portrayal, although most publications are archaeological reports for field experts and thus do not give a holistic understanding of Đồng Dương’s total archaeological footprint within a broader historical context. We bring English, French, and Vietnamese scholarship together in our analysis with field research and knowledge gleaned from indigenous Cham community members. We examine watchtowers, a citadel, relations with nearby ports, religious sites, a production site, and funerary sites while also noting challenges for ongoing research and providing recommendations for preserving the site in our conclusion.