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Chu Van Tuan,Mai Anh Tuan,Nguyen Van Hieu,Tran Trung 한국물리학회 2012 Current Applied Physics Vol.12 No.4
In this work, we have successfully developed a facile and effective electrochemical route for directly growing polyaniline (PANI) nanowires (NWs) on platinum interdigitated microelectrode. The asprepared NWs were characterized by field-emission scanning electron microscopy, transmission electron microscopy and Fourier-transform infrared spectroscopy. They revealed that the PANI NWs were obtained with diameters ranging from 50 to 200 nm and length up to hundreds of micro meters,depending on growth time. The as-obtained PANI NWs on the electrode exhibited a porous nature and the conducting emeraldine type structure. The gas sensing properties of PNAI NWs were explored by monitoring NH3 in synthetic air in the concentration range of 25-500 ppm at room temperature. The results obtained demonstrated that PANI NWs have good potential as novel room temperature sensors for practical applications.
Mai, Linh,Song, Hae-Il,Tuan, Le Minh,Su, Pham Van,Yoon, Giwan Wiley Subscription Services, Inc., A Wiley Company 2005 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS - Vol.47 No.5
<P>This paper presents some methods to improve the resonance characteristics of film bulk acoustic-wave resonator (FBAR) devices. The FBAR devices were fabricated on Bragg reflectors. Thermal treatments were done using sintering and/or annealing processes. The measurement shows a considerable improvement of return loss (S<SUB>11</SUB>) and quality factor (Q<SUB>s/p</SUB>). These thermal treatments seem very promising for enhancing the FBAR's resonance performance. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 459–462, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21199</P>
Effects of Thermal Treatment on the Characteristics of Spiral Inductors on Bragg Reflectors
Mai, Linh,Lee, Jae-Young,Le, Minh-Tuan,Pham, Van-Su,Yoon, Gi-Wan The Korea Institute of Information and Commucation 2006 Journal of information and communication convergen Vol.4 No.4
This paper presents the thermal technique to improve characteristic of planar spiral inductors. The spiral inductors were fabricated on silicon dioxide/silicon (SiO2/Si) wafer. The thermal treatment was done by annealing processes. The measure results showed a considerable improvement of return loss (Sl1). This thermal treatment seems very promising for enhancing spiral inductors based RF IC's.
New Alkaloids and Anti-inflammatory Constituents from the Leaves of Antidesma ghaesembilla
Van Kiem, Phan,Cuong, Le Canh Viet,Trang, Do Thi,Nhiem, Nguyen Xuan,Le Tuan Anh, Hoang,Tai, Bui Huu,Huong, Le Mai,Van Minh, Chau,Lee, Taek Hwan,Kim, Sun Yeou NATURAL PRODUCT COMMUNICATIONS 2017 Natural product communications Vol.12 No.1
Spiral inductors fabricated on multi-layered Bragg reflector for Si-based RF IC applications
Mai, Linh,Song, Hae-il,Minh Tuan, Le,Van Su, Pham,Yoon, Giwan Wiley Subscription Services, Inc., A Wiley Company 2006 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.48 No.7
<P>In this paper, for the first time, a novel physical structure of planar spiral inductors fabricated on a multilayered Bragg reflector is proposed. The multilayered Bragg reflector (BR) was fabricated on Si substrate. The effects of the multilayered Bragg reflector and inductor patterns on the characteristics of inductors are studied. The results show that the inductors fabricated on the Bragg reflector result in a significant improvement in terms of the S<SUB>11</SUB>-parameter. This approach seems highly feasible and promising for future Si-based RF IC applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1296–1298, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21621</P>
QRD-based Blind Detection for Orthogonal Space-Time Block Codes
Van-Su Pham,Minh-Tuan Le,Linh Mai,Jae-young Lee,S.M. Humayun Kabir,Giwan Yoon 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This work presents a simplified QR decomposition based (QRD-based) blind decoding for Orthogonal Space-Time Block Codes (OSTBCs) with M-ary Phase Shift Keying (M-PSK) modulation constellation. By applying the proposed matrix partition, the blind detection problem becomes simpler. In addition, with the aid of QRD, the proposed detection requires a remarkably low complexity while maintaining a reasonable low Bit-error-rate (BER).
A New Planar Spiral Inductor with Multi-layered Bragg Reflector for Si-Based RFIC's
Mai Linh,Lee Jae-Young,Le Minh-Tuan,Pham Van-Su,Yoon Gi-Wan The Korea Institute of Information and Commucation 2006 Journal of information and communication convergen Vol.4 No.2
In this paper, a novel physical structure for planar spiral inductors is proposed. The spiral inductors were designed and fabricated on multi-layered substrate Bragg-reflector/silicon (BR/Si) wafer. The impacts of multi-layered structure substrate and pattern on characteristics of inductor were studied. Experimental results show that the inductor embedded on Bragg reflector/silicon substrate can achieve the best improvement. At 0.4-1.6 GHz, the Bragg reflector seems to significantly increase the S11-parameter of the inductor.
Pham, Van-Su,Le, Minh-Tuan,Mai, Linh,Kabir, S.M.Humayun,Yoon, Gi-Wan The Korea Institute of Information and Commucation 2008 Journal of information and communication convergen Vol.6 No.2
In the blind Maximum-likelihood (ML) detection for Orthogonal Space-Time Block Codes (OSTBC), the problem of ambiguity in determining the symbols has been a great concern. A possible solution to this problem is to apply semi-blind ML detection, i.e. the blind ML decoding with pilot symbols or training sequence. In order to increase the performance, the number of pilot symbols or length of training sequence should be increased. Unfortunately, this leads to a significantly decrease in system spectral efficiency. This work presents an approach to resolve the aforementioned issue by introducing a new method for constructing transmitted information symbols, in which transmitting information symbols drawn form different modulation constellations. Therefore, the ambiguity can be easily eliminated. In addition, computer simulation is implemented to verify the performance of the proposed approach.