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Nguyen Thi Minh Hong,Nguyen Ba Doan,Nguyen Huy Tiep,Le Viet Cuong,Bui Nguyen Quoc Trinh,Pham Duc Thang,김동현 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
In this work, we study the magnetic properties of a CoFe/NiFe/PZT heterostructured nanocompositethat is affected by the strain in the PZT substrate when a voltage in the range from –250to 250 V is applied. An interesting electric-voltage-controlled magnetic anisotropy, with a relativeincrease in magnetization up to above 100%, is observed. This brings a new challenge to operate alow-power-consuming spin electronic device. We also utilize a theoretical model based on interfacecharge-mediated and strain-mediated magnetic-electric coupling to understand the change in themagnetic properties of the investigated material.
Nguyen, Tiep Tien,Pham, Tung Thanh,Nguyen, Hanh Thuy,Nepal, Mahesh Raj,Phung, Cao Dai,You, Zhiwei,Katila, Nikita,Pun, Nirmala Tillija,Jeong, Tae Cheon,Choi, Dong-Young,Park, Pil-Hoon,Yong, Chul Soon,K Elsevier 2019 Biomaterials Vol.221 No.-
<P><B>Abstract</B></P> <P>Host immune response remains an obstacle in cell-replacement therapy for treating type I diabetes. Long-term systemic immunosuppression results in suboptimal efficacy and adverse reactions. Thus, “cell-particle hybrids” of pancreatic islets and tissue-adhesive, polydopamine-coated, FK506-loaded biodegradable microspheres (PD-FK506-MS) were developed to locally modulate the immune response at the transplantation site. Coating of FK506-MS with PD enabled the rapid formation of stable cell-particle hybrids without significant changes in islet viability and functionality. Extremely low quantities of FK506 (approximately 600 ng per recipient) sustainably released from cell-particle hybrids effectively prolonged survival of xenogeneic islet graft. Interestingly, FK506 exhibited extended bioavailability in the grafts but was undetectable in systemic circulation and other tissues. Moreover, mRNA expression of inflammatory cytokines was significantly inhibited in the PD-FK506-MS-containing grafts but not in lymphoid organs. This study presents a promising platform that facilitates the translation of local immunomodulation towards an effective strategy with improved safety profiles for treating type I diabetes.</P>
The Role of Zn Doping on the Catalytic Activity of the Nanoparticle Perovskite La0.7Sr0.3MnO3
Tran Thi Minh Nguyet,Nguyen Quang Huan,Tran Que Chi,Do The Chan,Nguyen Doan Thai,Nguyen Cong Trang,Luu Tien Hung,Le Van Tiep,Nguyen Van Qui 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The nanometer complex oxide La0:7Sr0.3Mn0.6Zn0.₄O₃ was prepared by using a Sol-Gel method with citric acid as a ligand. The in uence of Zn doping of La0.7Sr0.₃MnO₃ on the structure, the morphology, the surface properties and on the catalytic activity of material was studied by using X-ray diraction (XRD), transmission electron microscopy (TEM), a high-resolution images and selected area electron diraction (SAED), physical adsorption and temperature programmed surface reaction (TPSR) methods. The results showed that perovskite La0:7Sr0:3Mn0:6. Zn0.₄O₃ could well catalyse propene oxidation in the temperature range 190 { 280 ℃, which was reduced to 100 { 120 ℃ for catalyst La1-χSrχMnO₃ The nanometer complex oxide La0:7Sr0.3Mn0.6Zn0.₄O₃ was prepared by using a Sol-Gel method with citric acid as a ligand. The in uence of Zn doping of La0.7Sr0.₃MnO₃ on the structure, the morphology, the surface properties and on the catalytic activity of material was studied by using X-ray diraction (XRD), transmission electron microscopy (TEM), a high-resolution images and selected area electron diraction (SAED), physical adsorption and temperature programmed surface reaction (TPSR) methods. The results showed that perovskite La0:7Sr0:3Mn0:6. Zn0.₄O₃ could well catalyse propene oxidation in the temperature range 190 { 280 ℃, which was reduced to 100 { 120 ℃ for catalyst La1-χSrχMnO₃
농업 이미지 처리를 위한 빅데이터 플랫폼 설계 및 구현
반퀴엣뉘엔 ( Van-quyet Nguyen ),신응억뉘엔 ( Sinh Ngoc Nguyen ),둑티엡부 ( Duc Tiep Vu ),김경백 ( Kyungbaek Kim ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2
Image processing techniques play an increasingly important role in many aspects of our daily life. For example, it has been shown to improve agricultural productivity in a number of ways such as plant pest detecting or fruit grading. However, massive quantities of images generated in real-time through multi-devices such as remote sensors during monitoring plant growth lead to the challenges of big data. Meanwhile, most current image processing systems are designed for small-scale and local computation, and they do not scale well to handle big data problems with their large requirements for computational resources and storage. In this paper, we have proposed an IPABigData (Image Processing Algorithm BigData) platform which provides algorithms to support large-scale image processing in agriculture based on Hadoop framework. Hadoop provides a parallel computation model MapReduce and Hadoop distributed file system (HDFS) module. It can also handle parallel pipelines, which are frequently used in image processing. In our experiment, we show that our platform outperforms traditional system in a scenario of image segmentation.
서민수(Min-Su Seo),조성대(Sung-Dae Cho),안남식(Nam-Shik Ahn),정지원(Ji-Won Jung),양세란(Se-Ran Yang),박준석(Joon-Suk Park),박기수(Ki-Su Park),홍인선(In-Sun Hong),조은혜(Eun-Hye Jo),Nguyen Ba Tiep(Nguyen Ba Tiep),이영순(Yong-Soon L 한국독성학회 2003 Toxicological Research Vol.19 No.2
A nonspecific immunostimulator BARODON® was tested for mutagenicity using Ames Salmonella tester strains TA98, TA100, TA102, TA1535 and TA1537 with or without metabolic activation<br/> (S9 mix). None of the fresh species showed mutagenicity. In the reverse mutation test using Salmonella typhimurium TA98, TA100, TA102, TA1535 and TA1537 did not increase the number of revertants at all doses tested (5, 2.5 or 1.25 mg/ml). Chromosome aberration test was carried out in Chinese hamster lung (CHL) cell line. The cells were treated with BARODON® (1, 0.5 or 0.25 mg/ml), while positive control group was treated with Mitomycin C (0.1 mg/ml). The results show that there is no statistically significant difference between positive control and treatment groups. In mouse micronucleus test, there was significant increase in the ratio of micronucleated polychromatic erythrocyte (MNPCE) in the high dose group (10% BARODON®), while there is no significance between control and low (2.5% BARODON®) or middle (5% BARODON®) dose groups. Taken togather, this results suggest that below 5% BARODON® might not have mutagenic potential in vitro and vivo systems.
Secrecy Capacity of the Primary System in a Cognitive Radio Network
Nguyen, Van-Dinh,Hoang, Tiep M.,Shin, Oh-Soon IEEE 2015 IEEE Transactions on Vehicular Technology VT Vol.64 No.8
<P>With fast growth of wireless services, secrecy has become an increasingly important issue for wireless networks. In this paper, we investigate the secrecy capacity of the primary system in a cognitive radio system based on artificial noise, which has been proposed for dealing with the eavesdropper. We first consider a special case of one eavesdropper and two regimes of the eavesdropping channel condition. Specifically, we analyze the impact of interference generated by a secondary system toward the primary system in a cognitive radio system. The channel state information (CSI) of the primary channel is assumed to be perfectly known at both the primary transmitter and receiver, whereas that of the eavesdropper is partially known. Under these assumptions, we derive analytical expressions for the ergodic secrecy capacity in the cases of strong eavesdropping channel and weak eavesdropping channel and analyze the impact of the secondary system on the primary ergodic secrecy capacity. Moreover, we extend the analysis to the general case of arbitrary eavesdropping channel condition and arbitrary number of eavesdroppers. Some numerical results will be also presented to verify the analysis.</P>
Design and Implementation of Geo-Social Information based Personalized Warning Notification System
Tiep Vu Duc,Quyet Nguyen-Van,Kyungbaek Kim 한국스마트미디어학회 2016 스마트미디어저널 Vol.5 No.2
In case of a emergency situation or a natural disaster, a warning notification system is an essential tool to notify at-risk people in advance and provide them useful information to survive the event. Although some systems have been proposed such as emergency alert system using android, SMS, or P2P overlay network, these works mainly focus on a reliable message distribution methods. In this paper, we proposed a novel design and implementation of a personalized warning notification system to help inform not only the at-risk people but also their family and friends about the coming disaster as well as escape plan and survival information. The system consists of three main modules: the user selection module, the knowledge based message generator, and message distribution modules. The user selection module collects the list of people involved in the event and sorts them based on their level of involvement (their location, working position and social relationships). The knowledge based message generator provides each person with a personalized message that is concise and contains only the necessary information for the particular person based on their working position and their involvement in the event. The message distribution module will then find a best path for sending the personalized messages based on trustiness of locations since network failures may exist in a disaster event. Additionally, the system also have a comprehensive database and an interactive web interface for both user and system administrator. For evaluation, the system was implemented and demonstrated successfully with a building on fire scenario.
Advances in alginate encapsulation of pancreatic islets for immunoprotection in type 1 diabetes
쩌우더리디네스,Nguyen Tiep Tien,Yook, Simmyung,정지헌 한국약제학회 2023 Journal of Pharmaceutical Investigation Vol.53 No.5
Background Islet transplantation is a promising minimally invasive approach that dispenses with many challenges, especially immunological complications such as instant blood-mediated inflammatory reaction, autoimmunity, and allogeneic or xenogeneic rejection. Besides, scare of islet donor, side effects of immunosuppressant, and poor angiogenesis are also crucial factors for long-term islet survival and function. Approaches to the encapsulation of islets have been introduced to address aforementioned challenges. Area covered In this review, we summarize the concept of islet encapsulation using alginate to minimize the immunological complications, maintain islet morphology, and exchange of nutrients, hormones, and metabolic waste via isolating pancreatic islets from host immune cells. Alginate encapsulation technologies like dripping, microfluidics, and 3D printing are also briefly introduced. Similarly, this review outlines islet encapsulation strategies (co-encapsulation with other cells, peptides, drugs, etc.,) and approaches (nano-, micro-, and macroencapsulation) using alginate. Alongside this, this review introduces the use of alginate in an oxygenation system to overcome the hypoxic environment faced by encapsulated islets. Finally, challenges and opportunities for islet encapsulation using alginate are also discussed in terms of clinical applications. Expert opinion With the aim of immunoisolation, islet encapsulation using alginate reduces immunological attacks and enhances the survivability of islets after transplantation. Alginate shows promise based on its biocompatibility, non-toxicity, and easy and fast gelation under physiological conditions. Intriguingly, it can also co-encapsulate islets with other biomolecules and shows compatibility with other polymers. With ongoing strides in research on islet encapsulation, alginateencapsulated islets could be available for the treatment of type 1 diabetes in the near future.