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A Novel Design of Suspension System for Driver's Seat
Thanh-Tung Luu(Thanh-Tung Luu),박성태(Sung-Tae Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
A driver's seat can be modeled with a suspension system of spring, mass and damper. To increase the capacity of anti-vibration, the natural frequency should be decreased as low as possible. In this paper, the method to decrease the natural frequency by the potential energy is introduced. In addition, the experiment is done on a small model to prove the theorem.
TUNG, Le Thanh,THANG, Pham Nang Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.3
The paper aims to investigate the impact of foreign direct investment (FDI) on private investment with a sample having 49 developing countries in Asia (17 countries) and Africa (32 countries) during the period of 1990-2017. Unlike previous studies, we split the data into three groups for further analysis, including the Asian, African and the full-panel samples. The results confirm a crowding-in effect which shows that foreign direct investment promotes private investment on all three research samples. Besides, the lagged private investment has a positive and significant effect on itself in the next period which reflects the inertia in the trend of private investment in recipient countries. In the full-panel sample, there are some macro factors such as GDP per capita, trade openness, and electricity that also have a positive and statistically significant impact on private investment. Besides, when more deeply estimate with smaller samples, we find that trade openness and labour force have a positive and significant in Africa, on the other hand, not in Asia. However, the domestic credit variable has a negative and significant effect on private investment only in Asian developing countries. Furthermore, there is only a positive and significant impact of the electricity variable on private investment in Asia.
Throughput Maximization for a Primary User with Cognitive Radio and Energy Harvesting Functions
( Thanh-tung Nguyen ),( Insoo Koo ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.9
In this paper, we consider an advanced wireless user, called primary-secondary user (PSU) who is capable of harvesting renewable energy and connecting to both the primary network and cognitive radio networks simultaneously. Recently, energy harvesting has received a great deal of attention from the research community and is a promising approach for maintaining long lifetime of users. On the other hand, the cognitive radio function allows the wireless user to access other primary networks in an opportunistic manner as secondary users in order to receive more throughput in the current time slot. Subsequently, in the paper we propose the channel access policy for a PSU with consideration of the energy harvesting, based on a Partially Observable Markov decision process (POMDP) in which the optimal action from the action set will be selected to maximize expected long-term throughput. The simulation results show that the proposed POMDP-based channel access scheme improves the throughput of PSU, but it requires more computations to make an action decision regarding channel access.
Thanh-Tung Duonga,Phan Huy Hoang,Luu Thi Nhan,Luong Van Duong,Man Hoai Nam,Le Quoc Tuan 한국물리학회 2019 Current Applied Physics Vol.19 No.11
Large-grain-size and void-free CH3NH3PbI3 films with bilayer structure are fabricated by spin-coating a PbI2 layer onto a mesoporous TiO2 layer and sequentially spraying CH3NH3I (methylammonium iodide, MAI) multilayers. The sprayer is controlled by a homemade three-axis computer numerical control machine; thus, the substrates are coated by successive parallel passes achieved by moving the nozzle. Spray deposition at the optimal spray rate and substrate temperature produces a large-grain-size and void-free methylammonium lead iodide (MAPbI3) bilayer structure. The mesoporous TiO2 layer plays an important role in electron transport by preventing the return of electrons to the perovskite layer and decreasing the contact resistance at the perovskite/ compact TiO2/fluorine tin oxide interface. When the films are incorporated into a solar cell device with a conductive carbon counter electrode, a maximum power conversion efficiency of 10.58% is realised.
Tung Nguyen Thanh,신힘차,김활란,박소라,김지영,최병현 한국조직공학과 재생의학회 2017 조직공학과 재생의학 Vol.14 No.3
In recent years, several kinds of cardiac progenitor cells have been identified and isolated from heart tissue. These cells showed differentiation potential into cardiomyocytes, smooth muscle cells, and endothelial cells in vitro and in vivo. Morphogenetic events are tightly regulated during development to determine cell destiny and reshape the embryonic lineage. In this study, we directly compared the characteristics of rat fetal cardiac progenitor cells (rFCPCs) isolated from the chamber formation stage at embryonic day 12 (E12) and at the septation stage of E15. Both kinds of rFCPCs expressed mesenchymal stem cell markers (CD105, CD73, and CD29) but not CD34 and CD45. The E12 rFCPCs expressed a high level of Oct4 compared to E15 until passage 5 and showed a steep decline of Nkx2.5 expression at passage 5. However, Nkx2.5 expression at E15 was maintained until passage 5 and Oct4 expression slightly increased at passage 5. We also detected an intense staining for Oct4 antibody in E12 heart tissue sections. The average doubling time of the E12 rFCPCs from passage 3 to passage 15 was about 5 hours longer than E15. These cells could also be induced into cardiomyocytes expressing a-MHC, cTnT, cTnC, and Cx43 under cardiomyogenic culture conditions and rFCPCs at E15 showed more intense staining of a-MHC than cells at E12 by immunocytochemistry. Taken together, our results show that developmental differences between E12 and E15 may influence their properties and differentiation. Furthermore those differences should be considered when deciding on the optimal cell source for cell replacement therapy in cardiovascular regeneration.
Tung Thanh Bui,Hai Thanh Nguyen 경희대학교 융합한의과학연구소 2017 Oriental Pharmacy and Experimental Medicine Vol.17 No.4
Sophora japonica has been shown many beneficial pharmacological activities, including the neuroprotective effects. Flavonoids, isoflavonoids, triterpenes, alkaloids are bioactive compounds identified presence in Sophora japonica. The present study aimed to evaluate the neuroprotective effects of ethanolic extract of Sophora japonica flower buds on scopolamine (SCP)-induced cognitive deficits in mice. The modulatory effect of Sophora japonica on memory impairment was investigated using Y-maze and the Morris water maze tasks. Acetylcholine (ACh) levels and acetylcholinesterase enzyme (AChE) activity were measured in brain tissue to investigate the cholinergic effect of Sophora japonica. Pro-inflammatory tumor necrosis factor alpha (TNF-α), interleukin 1 beta (IL-1β), and anti-inflammatory interleukin 10 (IL-10) were also evaluated in mice brain tissue to investigate the anti-inflammatory effect of Sophora japonica. Scopolamine induced the cognitive deficits in Y-maze and Morris water maze test along with reducing ACh level and increasing AChE activity and inflammation in brain tissue. Treatment with ethanolic extract of Sophora japonica flower buds reduced the SCP-induced memory impairment in both behavioral tests along with reducing inflammation and AChE activity, and increasing ACh level in brain tissue. Our data demonstrated that ethanolic extract of Sophora japonica flower buds enhanced cognitive deficits in mice induced by scopolamine, and it is a promising source for the treatment of Alzheimer.
Tung Thanh Pham,Hanh Thuy Nguyen,Cao Dai Phung,Shiva Pathak,Shobha Regmi,하동호,김종오,용철순,김상균,최지은,육심명,박준범,정지헌 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
Selective delivery of anti-cancer drugs to bone tumors remains an on-going developmental issue due toproblems of drug availability and the physiological nature of bone. This study was undertaken to enhanceaccumulation of doxorubicin (DOX) in bone metastasis microenvironments using alendronate-functionalized graphene oxide nanosheets (NGO-ALs). In vivo biodistribution study showed NGO-ALswere retained for longer and at higher concentrations in bone tumor areas than non-functionalizedNGOs. Ourfindings suggest that NGO-ALs could be used as a promising carrier to enhance antitumoreffects and diminish the off-target effects of DOX for the treatment of bone metastasis.