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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.
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.
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.
A Connection Entropy-based Multi-Rate Routing Protocol for Mobile Ad Hoc Networks
Hieu, Cao Trong,Hong, Choong-Seon Korean Institute of Information Scientists and Eng 2010 Journal of Computing Science and Engineering Vol.4 No.3
This paper introduces a new approach to modeling relative distance among nodes under a variety of communication rates, due to node's mobility in Mobile Ad-hoc Networks (MANETs). When mobile nodes move to another location, the relative distance of communicating nodes will directly affect the data rate of transmission. The larger the distance between two communicating nodes is, the lower the rate that they can use for transferring data will be. The connection certainty of a link also changes because a node may move closer to or farther away out of the communication range of other nodes. Therefore, the stability of a route is related to connection entropy. Taking into account these issues, this paper proposes a new routing metric for MANETs. The new metric considers both link weight and route stability based on connection entropy. The problem of determining the best route is subsequently formulated as the minimization of an object function formed as a linear combination of the link weight and the connection uncertainty of that link. The simulation results show that the proposed routing metric improves end-to-end throughput and reduces the percentage of link breakages and route reparations.
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.
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.