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NGUYEN Trung Hieu,NGUYEN Phuoc Tai DAOS(The Daesoon Academy of Sciences) 2023 Journal of Daesoon Thought and the Religions of Ea Vol.2 No.2
Daoism was introduced into the South-West of Vietnam via two main entries: the missionaries from North and Central Vietnam who migrated to the South by following the Southward movement and the spread of Daoism by Chinese migrant men who came and settled in the South-West of Vietnam from the late seventieth century to late nineteenth century. However, the biggest influence of Daoism in the Southwest of Vietnam was mainly the Chinese missionaries of Daoism. As time went by, together with the impacts of social and historical circumstances, Daoism had a strong influence on the lives of the South-West people in terms of different aspects, especially their faith and religions. The impact of Daoism into people's faith and religion was considerable, especially to the indigenous religions, of which the religion, Four Debts of Gratitude, is a representative example. With the aims of clarifying how Four Debts of Gratitude was influenced by Daoist thought and how the indigenous religions and systemized ideologies in the South-West of Vietnam were related during the period of living condition expansion as well as cohabitation of several ethnic groups in the region, this article focuses on Daoist thought expressed in typical symbols in the sacred architecture of the Four Debts of Gratitude such as Cổ Lầu, wine gourds, and the Eight Trigrams. Once properly examined, it becomes clear that the prominent symbols and other Daoist elements show that Daoism had a profound influence on the Four Debts of Gratitude.
SnO<sub>2</sub> Hollow Hemisphere Array for Methane Gas Sensing
Hieu, Nguyen Minh,Vuong, Nguyen Minh,Kim, Dojin,Choi, Byung Il,Kim, Myungbae Materials Research Society of Korea 2014 한국재료학회지 Vol.24 No.9
We developed a high-performance methane gas sensor based on a $SnO_2$ hollow hemisphere array structure of nano-thickness. The sensor structures were fabricated by sputter deposition of Sn metal over an array of polystyrene spheres distributed on a planar substrate, followed by an oxidation process to oxidize the Sn to $SnO_2$ while removing the polystyrene template cores. The surface morphology and structural properties were examined by scanning electron microscopy. An optimization of the structure for methane sensing was also carried out. The effects of oxidation temperature, film thickness, gold doping, and morphology were examined. An impressive response of ~220% was observed for a 200 ppm concentration of $CH_4$ gas at an operating temperature of $400^{\circ}C$ for a sample fabricated by 30 sec sputtering of Sn, and oxidation at $800^{\circ}C$ for 2 hr in air. This high response was enabled by the open structure of the hemisphere array thin films.
Hieu, Tran Trung,Kim, Soon-Il,Lee, Sang-Guei,Ahn, Young-Joon Oxford University Press 2010 Journal of medical entomology Vol.47 No.4
<B>Abstract</B><P>The repellency to female Stomoxys calcitrans (L.) (Diptera: Muscidae) of 21 essential oils (EOs) alone or in combination with Calophyllum inophyllum L. (Clusiaceae) nut oil (tamanu oil) was examined using an exposed human hand bioassay. Results were compared with those of commonly used repellent N,N-diethyl-3-methylbenzamide (DEET). In tests with six human male volunteers at a dose of 0.5 mg/cm2, patchouli (protection time [PT], 3.67 h) was the most effective EO but less active than DEET (4.47 h), as judged by the PT to first bite. Very strong repellency also was produced by clove bud, lovage root, and clove leaf EOs (PT, 3.50-3.25 h), whereas strong repellency was obtained from thyme white EO (2.12 h). Thyme red, oregano, and geranium EOs exhibited moderate repellency (PT, 1.24-1.11 h). At 0.25 mg/cm2, protection time of clove bud, clove leaf, and lovage root EOs (PT, ≈1 h) was shorter than that of DEET (2.17 h). An increase in the protection time was produced by binary mixtures (PT, 2.68-2.04 h) of five EOs (clove bud, clove leaf, thyme white, patchouli, and savory) and tamanu oil (0.25:2.0 mg/cm2) compared with that of either the constituted essential oil or tamanu oil alone (PT, 0.56 h). The protection time of these binary mixtures was comparable with that of DEET. With the exception of savory EO, the other EOs, tamanu oil, and binary mixtures did not induce any adverse effects on the human volunteers at 0.5 mg/cm2. Thus, binary mixtures of essential oils and tamanu oil described merit further study as potential repellents for protection from humans and domestic animals from biting and nuisance caused by S. calcitrans.</P>
Kalman filter-based ARAIM algorithm for integrity monitoring in urban environment
Hieu Trung Tran,Letizia Lo Presti 한국통신학회 2019 ICT Express Vol.5 No.1
This work proposes an adaptation of Advanced Receiver Autonomous Integrity Monitoring (ARAIM) algorithm for snapshot integrity monitoring in urban environment, using Kalman Filter (KF) as underlying positioning method. This new method can follow the changes of signal quality, maintaining good performance under the effect of multipath which is always presents in urban areas. Performance analysis using both simulated and real data validates the method, and comparison with conventional ARAIM algorithm (which was developed for aviation) further consolidates the suitability of the proposed method for urban scenario.
Hieu, Hoang Nhat,Dao, Van-Duong,Vuong, Nguyen Minh,Kim, Dojin,Choi, Ho-Suk Materials Research Society of Korea 2014 한국재료학회지 Vol.24 No.9
Light scattering enhancement is widely used to enhance the optical absorption efficiency of dye-sensitized solar cells. In this work, we systematically analyzed the effects of spherical voids distributed as light-scattering centers in photoanode films made of an assembly of zinc oxide nanoparticles. Spherical voids in electrode films were formed using a sacrificial template of polystyrene (PS) spheres. The diameter and volume concentration of these spheres was varied to optimize the efficiency of dye-sensitized solar cells. The effects of film thickness on this efficiency was also examined. Electrochemical impedance spectroscopy was performed to study electron transport in the electrodes. The highest power conversion efficiency of 4.07 % was observed with $12{\mu}m$ film thickness. This relatively low optimum thickness of the electrode film is due to the enhanced light absorption caused by the light scattering centers of voids distributed in the film.
A pilot power allocation for improving spectral efficiency of massive MIMO systems
Hieu Trong Dao(다오 충 히에우),Sunghwan Kim(김성환) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
In this paper, we introduce a pilot power scheme in multi-cell multi-user massive MIMO systems to enhance system spectral efficiency. Specifically, we propose an optimization problem to improve the uplink sum rate of a predefined cell in the system. We also prove that the proposed problem can be solved by using a method of Lagrange multiplier Simulation results are provided to compare between our proposed scheme performance and other proposed schemes.
Hieu Tran, Van,Park, Hyunjun,Park, Jaekyung,Kwon, Young-Do,Kang, Shinwoo,Ho Jung, Jae,Chang, Keun-A,Chul Lee, Byung,Lee, Sang-Yoon,Kang, Soosung,Kim, Hee-Kwon Elsevier 2019 Bioorganic & medicinal chemistry Vol.27 No.18
<P><B>Abstract</B></P> <P>Translocator protein (TSPO) expression is closely related with neuroinflammation and neuronal damage which might cause several central nervous system diseases. Herein, a series of TSPO ligands (<B>11a</B>–<B>c</B> and <B>13a</B>–<B>d</B>) with a 2-phenylpyrazolo[1,5-<I>a</I>]pyrimidin-3-yl acetamide structure were prepared and evaluated via an <I>in vitro</I> binding assay. Most of the novel ligands exhibited a nano-molar affinity for TSPO, which was better than that of DPA-714. Particularly, <B>11a</B> exhibited a subnano-molar TSPO binding affinity with suitable lipophilicity for <I>in vivo</I> brain studies. After radiolabeling with fluorine-18, [<SUP>18</SUP>F]<B>11a</B> was used for a dynamic positron emission tomography (PET) study in a rat LPS-induced neuroinflammation model; the inflammatory lesion was clearly visualized with a superior target-to-background ratio compared to [<SUP>18</SUP>F]DPA-714. An immunohistochemical examination of the dissected brains confirmed that the uptake location of [<SUP>18</SUP>F]<B>11a</B> in the PET study was consistent with a positively activated microglia region. This study proved that [<SUP>18</SUP>F]<B>11a</B> could be employed as a potential PET tracer for detecting neuroinflammation and could give possibility for diagnosis of other diseases, such as cancers related with TSPO expression.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>