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Nguyen, Van-Toan,Tran, Quoc Chinh,Quang, Nguyen Duc,Nguyen, Ngoc-Anh,Bui, Van-Tien,Dao, Van-Duong,Choi, Ho-Suk Elsevier 2018 Journal of alloys and compounds Vol.766 No.-
<P><B>Abstract</B></P> <P>The improvement of the catalytic performance for methanol and formic acid oxidation reactions remains a key issue for the development of a new generation of direct methanol and formic acid fuel cells. This study reports a simple approach, using selective chemical etching for the synthesis of unique nitrogen-doped carbon dot/Pt<SUB>84</SUB>Pd<SUB>16</SUB> (N-Cdot/Pt<SUB>84</SUB>Pd<SUB>16</SUB>) nano-network structure at room temperature with excellent electrocatalytic properties. The obtained nano-network hybrid material exhibits significant enhancement of the electrocatalytic activity for the electro-oxidation reaction of both methanol and formic acid with current densities of 999.0 and 1919.5 mA/mg<SUB>metal</SUB>, respectively, compared with the commercial ones of 751.32 and 806.02 mA/mg<SUB>metal</SUB>, respectively. Furthermore, the N-Cdot/Pt<SUB>84</SUB>Pd<SUB>16</SUB> nano-network hybrid materials exhibit excellent stability and hydrophilic dispersibility at room temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N-Cdot/PtPd nanonetwork hybrid material is synthesized at room temperature. </LI> <LI> A simple coreduction and a selective chemical etching are applied to the synthesis. </LI> <LI> It generates a nano-network structure with excellent electrocatalytic properties. </LI> <LI> N-Cdot functions as a uniform interconnection between the nanohybrid materials. </LI> <LI> The hybrid exhibits significant enhancement of the activity for both MOR and FAOR. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
GNU Radio와 USRP 플랫폼을 이용한 OFDM및 COFDM 구현에 관한 연구
디엔 뉴옌 반(Dien Nguyen Van),투안 뉴옌 안(Tuan Nguyen Anh),티엔 호아 뉴옌(Tien Hoa Nguyen),반 둑 뉴옌(Van Duc Nguyen),노승환(Soonghwan Ro) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.2
SDR allows users to adjust a system with its flexibility and re-configurability for any frequency band and different modulation of various physical parameters by using programmable hardware and software. In this paper, we implement an Orthogonal Frequency Division Multiplexing (OFDM) system with and without channel coding blocks based on Software-Defined Radio. Quadrature amplitude modulation QAM-16, convolutional encoder with block interleaving algorithm and hard decision Viterbi decoder are deployed for the implementation. Different scenarios have been implemented in real-time wireless transmission in order to evaluate the Packet Failure Rate (PFR). The results show that the introduction of channel coding reduces the PFR of transmitted data signals.
Decentralized Dynamic Sub-Carrier Assignment for OFDMA-Based Adhoc and Cellular Networks
NGUYEN, Van-Duc,HAAS, Harald,KYAMAKYA, Kyandoghere,CHEDJOU, Jean-Chamerlain,NGUYEN, Tien-Hoa,YOON, Seokho,CHOO, Hyunseung The Institute of Electronics, Information and Comm 2009 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.92 No.12
<P>In this paper, a novel decentralised dynamic sub-carrier assignment (DSA) algorithm for orthogonal frequency division multiple access (OFDMA)-based adhoc and cellular networks operating in time division duplexing (TDD) mode is proposed to solve the hidden and exposed node problem in media access control (MAC). This method reduces the co-channel interference (CCI), and thus increases the overall throughput of the network. Reduced CCI and increased throughput can be achieved, if time and frequency selectivity of the multi-path fading channel and the channel reciprocity offered by the TDD are fully exploited. The time and frequency selectivity of the channel are usually the main problem in mobile communication. However, in the context of channel assignment for OFDMA-based networks in TDD mode, the time and frequency selectivity of the channel are the key to reduce the interference. In the proposed channel assignment mechanism, several clusters of sub-carriers are assigned for data transmission between a transmitter and a receiver only if the corresponding channels of those sub-carriers linking this transmitter to potential victim receivers are deeply faded. In addition, the proposed algorithm works in a fully decentralised fashion and, therefore, it is able to effectively support ad hoc and multihop communication as well as network self-organisation. Numerical results show that the throughput obtained by the proposed approach for a given quality of service is higher than those of the conventional methods in any precondition of adhoc geographic scenario.</P>
Nguyen Huu Tung,Chau Van Minh,Phan Van Kiem,Hoang Thanh Huong,Tran Thu Ha,Nguyen Tien Dat,Nguyen Xuan Nhiem,Nguyen Xuan Cuong,Jae-Hee Hyun,Hee-Kyoung Kang,김영호 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.12
One new C29 sterol with a cyclopropane ring at C-25 and C-26, aragusteroketal B (1), and aragusterol B (2) were isolated from the Vietnamese marine sponge Ianthella sp. Their structures were elucidated by extensive spectroscopic analyses. Both 1 and 2 showed moderate cytotoxic activity against MCF-7, SK-Hep-1, and HeLa cell lines with IC50 in the range of 12.8-27.8 μM.
Control of Active Suspension System by Using H$\infty$ Theory
Nguyen, Tan-Tien,Nguyen, Van-Giap,Kim, Sang-Bong Institute of Control 2000 Transaction on control, automation and systems eng Vol.2 No.1
This paper presents a control of active suspension for quarter car model with two degree of freedom by using H$\infty$ method. Absolute velocity of car body is measured for feedback. The system parameter variations are treated with multiplicative uncertainty model. Simulation results show that the H$\infty$ control provides good trade-off between ride quality, suspension packaging and road holding constraints. The experiment with a front wheel suspension system was done to verify the simulation results.
Nguyen Van Tien 한국콘텐츠학회 2009 ICCC International Digital Design Invitation Exhib Vol.2009 No.12
A special pagoda type in Bac Bo plain from the Ly dynasty with Thay pagoda as the first architecture of this type is Front Buddha-Back Sant pagoda. Its distinguished appearance is in architectural composition and the arrangement of cultic characters who existed in the real life. These characters with their magic power deprived of their education and drill were honoured to stains. And after they died, they were taken to pagoda for cult with Buddha. This is a faily typical phenomenon was found in mahy places in the right bank of Red River. It existed in the period when Vietnamese Buddhism was at the climax, after that it didn't appeared again.
New Ceramide from Alocasia macrorrhiza
Tien, Nguyen Quyet,Ngoc, PhamHoang,Minh, Pham Hong,Kiem, Phan Van,Minh, Chau Van,Kim , Young-Ho The Pharmaceutical Society of Korea 2004 Archives of Pharmacal Research Vol.27 No.10
A new ceramide alomacrorrhiza A was isolated from the ethanolic extract of the plant Alocasia macrorrhiza (L.) Schott. Its chemical structure was elucidated as (2S,3S,4R)-2N-[(2'R)-2'- hydroxy-hexacosanoyl]-tetradecane-1,3,4-triol based on extensive 1D, 2D NMR, EI-MS, FABMS, HR-FAB-MS spectroscopic data and chemical degradation studies.