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Duyen Ha Thi Kim,Tien Ngo Manh,Cuong Nguyen Manh,Nhan Duc Nguyen,Dung Pham Tien,Manh Tran Van,Minh Phan Xuan 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.4
The paper proposes the method to deal with control problems of unmodeled components of the fourwheeled Omni-directional mobile robot. It is commonly challenging to design a model-based control scheme to achieve smooth movement in the tracking process due to the unknown elements in the mathematical model of the robot or external disturbances. Our main contribution focuses on designing an adaptive controller based on neural networks with online weight updating laws and Fuzzy logic to guarantee the high accuracy of the robot’s movement when the unknown factors adversely affect the robot control. At the initial step, a Dynamic Surface Control plays a role as a core of the controller for the robot system. Then, with the ability to estimate the appropriate value for uncertain nonlinear parts, a Radial Basis Function Neural Network is designed. Finally, a Fuzzy law is to utilize control parameters in each period to increase the adaptive behavior of the system. The stability and convergence of the system are proven by the Lyapunov’s stability theory. The simulation results illustrate the validity and the efficiency of the proposed control algorithm when the system is lack of robot model’s information.
Inhibitory Effects of Vietnamese Medicinal Plants on Monoamine Oxidase Activity
Hung, Vu Manh,Minh, Chau Van,Kiem, Phan Van,Dang Thi Lan Huong,Nguyen Tien Dat,Kim, Young Ho 충남대학교 약학대학 의약품개발연구소 2002 藥學論文集 Vol.17 No.-
In vitro in screening test aiming to find monoamine oxidase (MAO) inhibitors from Vietnamese medicinal plants, the MeOH extracts of seventeen medicinal plants were tested for the inhibitory effects on monoamine oxidase activity. MAO was purified from mouse brain and its activity was determined by fluorospectrophotometer using kynuramine as a substrate. Five MeOH extracts of medicinal plants including Cnidium monnineri showed quite strong inhibitory effects at the concentration of 250 ㎍/㎖. Six MeOH extracts of herbs including Astragalus membranaceus showed moderate inhibitory effects on this enzyme. Seven medicinal plants which showed good inhibitory effects on MAO were fractionated with CH_2Cl_2, EtOAc, BuOH and H_2O, successively. They were investigated for the inhibitory effects on MAO.
Assessment of the Magnetocaloric Effect upon the Magnetic Entropy Change
Ying De Zhang,Tien Van Manh,The Long Phan,박홍렬,유성초 한국물리학회 2021 New Physics: Sae Mulli Vol.71 No.4
The magnetocaloric effect is a dynamic phenomenon associated with a temperature change of a magnetic material when it is subjected to a magnetic-field change. The effect can be assessed through the adiabatic temperature change (ΔTad) or the isothermal magnetic-entropy change (ΔSm). This work reviews some typical methods that are usually used to calculate ΔSm for perovskite-type manganites. These methods was thermodynamic relations and different theoretical models to analyze magnetization isotherms, M(H) data, recorded at temperatures around the ferromagnetic-paramagnetic phase transition (TC), Together with showing the methods for calculating of ΔSm, we also take into account the figures of merit of a MC material.
Efforts in the Formation and Development of Nuclear Medicine in Vietnam
Trong Khoa Mai,Cam Phuong Pham,Tien Cong Bui,Hai Binh Tran,Van Thai Pham,Manh Phuong Dao,Dinh Ha Tran 대한핵의학회 2019 핵의학 분자영상 Vol.53 No.2
The foundations of nuclear medicine in Vietnam were established from 1970. Until now, after 48 years of development, in Vietnam, we have some basic equipment including 31 SPECT, 4 SPECT/CT machines, 11 PET/CT scanners, five cyclotrons, and one nuclear reactor.Many nuclearmedicine techniques in diagnosis and treatment have been routinely performed at provincial and central level health facilities such as tumor scintigraphy, thyroid scintigraphy, bone scintigraphy, kidney scintigraphy, cardiac scintigraphy, and radio-isotope therapy with I-131 and P-32. Selective internal radiation therapy with Y-90 microsphere and I-125 radioactive seed implantation has been also successfully applied in some big hospitals. However, there are still many difficulties for Vietnam as the lack of new widely used radioisotopes such as Ga-67, Cu-64, Samarium-153, and Lutetium-177 and the lack of nuclear medicine specialists. In the future, we are putting our efforts on the applications of new isotopes in diagnosis and treatment of cancers (theranostic) like Ga-68-DOTATATE, Lutetium-177-DOTATATE, Ga-68-PSMA, and Lutetium-177-PSMA, equipping modern nuclear medicine diagnostic tools, strengthening the human resources training in nuclear medicine. At the same time, we are trying our best to strengthen the cooperation with international nuclear medicine societies in over the world.
Tran Dang Thanh,Dinh Chi Linh,Tien Van Manh,Wen-Zhe Nan,Seong-Cho Yu,Hong-Guang Piao,Liqing Pan 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.3
In this work, we present a detailed study on the magnetic and the magnetocaloric properties of Sm0.5+xSr0.5−xMnO3 compounds with x = 0 − 0.1, which were prepared by using a solid-state reaction method. The x-dependent magnetic, as well as magnetocaloric, properties, including the magnetic phase transition, have been studied. The increase in Sm/Sr ratio plays an important role in controlling the Curie temperature (TC). We point out that all the samples undergo a first-order phase transition and exhibit a giant magnetocaloric effect. The magnetic entropy change (Sm) of samples was calculated based on isothermal M(H, T) data. The maximum value of Sm (denoted as |Smax|) at around TC is found to be 2.6 − 8.9 J·kg−1·K−1 for H = 30 kOe and depends on the value of x. We have also used the universal master curve method for the temperature dependences of Sm curves measured at different H values, Sm(T,H), to distinguish the magnetic order in the samples. Interestingly, none of the Sm(T,H) curves for the samples follow the universal master curve, Sm(T,H)/Smax versus = (T −TC)/(Tr−TC). As a consequence, a breakdown in the universal behavior of Sm(T,H)/Smax versus curve is another feature confirming a first-order phase-transition nature.
톨러런스기반 플레이트 접합 장치를 사용한 고중량 RC보의 설치 성능
홍원기 ( Hong Won-kee ),응엔반티엔 ( Nguyen Van Tien ),응엔만컹 ( Nguyen Manh Cuong ),쿤디마나에릭 ( Nkundimana Eric ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
Methods for the manufacture, erection, and assembly of heavy frame modules were proposed. Interferences among precast members were prevented by using bolted metal plates for dry precast beam-to-column joints during assembly with a clearance for tolerance implementing grouted concrete filler plates instead of metal filler plates. Clearances for tolerances were provided to avoid conflictions among components during erection phases. These gaps were, then, grouted by high-strength mortar. The constructability of new connections of a beam-to-column joint using bolted metal plates for precast structures was examined using a full-scale assembly test in which practical observations indicated that members could be aligned and placed accurately in both horizontal and vertical directions, leading to a fast and convenient assembling. Bolt holes of the endplate were properly aligned using couplers with 30 mm fastened length embedded in the columns. The assembly test demonstrated the erection safety and structural stability of the proposed joints that were without filler plates when they were subjected to heavy loads at the time of their erection. The facile and rapid assembly of precast beam-to-column connections with a 30 mm tolerance was observed. The proposed assembly method is rapid, sustainable, and resilient, replacing the conventional methods of concrete frame construction, offering a connection that can be used in constructing infrastructure, such as buildings and pipe-rack frames.
Tran Dang Thanh,Dinh Chi Linh,Le Viet Bau,Thi Anh Ho,Tien Van Manh,The-Long Phan,Seong-Cho Yu IEEE 2015 IEEE transactions on magnetics Vol.51 No.1
<P>Four samples of La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>Mn<SUB>0.92</SUB>Co<SUB>0.08</SUB>O<SUB>3</SUB> (LSMCO) with different crystallite sizes were prepared by the combination of solid-state reaction and mechanical milling methods. Based on isothermal magnetization data, M(H), temperature dependences of magnetic entropy change, ΔS<SUB>m</SUB>T, of the samples under a magnetic field change of 10 kOe were calculated. The maximum values of magnetic entropy change (|ΔS<SUB>max</SUB>|) at room temperature are in the range of 0.9-1.4 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP>, corresponding to ferromagnetic (FM)-paramagnetic phase transition. In addition, M<SUP>2</SUP> versus H/M curves at temperatures around TC prove the samples exhibiting a second-order magnetic phase transition. The critical exponents β, γ, and δ were determined using the modified Arrott plot method and critical isotherm analysis. Here, these exponent values are located in between those expected for the mean-field theory and 3-D Heisenberg model. It means the coexistence of short-range and long-range FM interactions in LSMCO nanoparticles.</P>