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Huynh Van Thao,Bui Thi Chuyen,Pham Van Toan,Tran Sy Nam,Nguyen Van Cong 환경독성보건학회 2023 환경독성보건학회지 Vol.38 No.4
Fenobucarb is one of most common insecticides applied to rice crops in the Vietnamese Mekong Delta. Paddy fields are preferred habitats for snakehead fish (Channa striata). Therefore, the probability of exposure risks and growth effects is highly. This paper aimed to examine the effects of using fenobucarb based – Excel Basa 50EC on the brain cholinesterase (ChE) of snakehead fish. Two rice fields, in which a single dose of Excel Basa 50EC was applied to one field, whilst the other acted as a control. Each field was subdivided into three plots by earthen dikes. In each plot, one fish cage (1.2 m x 1.2 m x 1.2 m) was installed that was stocked with 20 snakehead fish. The Excel Basa 50EC was applied once at the indication dose. The results highlighted that the concentration of fenobucarb in water at 1 hr after application was 116.72 ppb ± 12.64, which decreased to 23.96 ± 6.61 ppb after d and then to below detection limits (0.02 ppb). For fish living in this field, no mortality was seen, but ChE was significantly inhibited for 31 % on the first day and recovery following 7 days of exposure. Residues of fenobucarb in soil and fish should also be investigated furthermore.
Modified Sliding Mode Control for Mismatched Uncertain Large-Scale Systems
Van Van Huynh,Bach Hoang Dinh 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.6
In this paper, a modified sliding mode control is proposed to stabilize a class of large-scale systems with mismatched uncertainties, unknown exogenous disturbances and without the measurements of the states. Based on the Lyapunov method, appropriate linear matrix inequality stability conditions are derived to guarantee the stability of the system. Then, a modified adaptive sliding mode control law is proposed to guarantee the finite time reachability of the system states by using output feedback only. Final, a double-inverted pendulums system connected by a spring is simulated to demonstrate the efficacy of the proposed method.
Fairness CSMA/CA MAC Protocol for VLC Networks
Huynh, Vu Van,Jang, Yeong-Min The Institute of Internet 2012 Journal of Advanced Smart Convergence Vol.1 No.1
This paper presents a fair MAC protocol based on the CSMA/CA algorithm in visible light communication (VLC) networks. The problem of bandwidth sharing among differentiated priority in VLC networks can be solved by using number of backoff time and backoff exponent parameters with AIFS. The proposed algorithm can achieve fair allocation of the bandwidth resource among differentiated priority. The two dimension Markov chain is assisted for analyzing the proposed mechanism about throughput and delay metrics. Numerical results show that our proposed algorithm improves the fairness among different traffic flows.
Probabilistic Approach to Predicting Residual Longitudinal Strength of Damaged Double HullVLCC
Van-Vu Huynh,Seung-Hyun Lee,Sang-Rai Cho 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.3
This paper estimates the residual longitudinal strength af a damaged double hull VLCC (Very Large Crude Carrier) under combined vertical and horizontal bending moments using Smith’s method. The damage estimated in this study occurred due to collision or grounding accidents. The effects af the randomness af the yield stress, plate thickness, extent of damage, and the combination af these three parameters on the ultimate hull girder strength were investigated. Random variables were generated by a Monte Carlo simulation and applied to the double hull VLCC described by the ISSC (International Ship and Offshore Structures Congress) 2000 report.
Reliability analysis of Residual longitudinal strength of damaged ships.
Huynh Van-Vu,Cho Sang-Rai 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
In the present study, based on the value of residual longitudinal strength of damaged ships was predicted by the Smith's method, the reliability analysis has been carried out for both vertical and horizontal bending moments. The limit state function was derived based on the interaction equation. Four cases of still water bending moment and two Monte Carlo simulations which different samples have been performed. This study focused on Bulk Carrier and Double Hull VLCC in ISSC 2000.
A Multi-scale CFD Study on Cooling Performance of Lithium-ion Battery using Phase Change Material
Van-Tinh Huynh(후인반띤),Sang-Wook Lee(이상욱),Kyoung-Sik Chang(장경식) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This paper analyzes the effect of phase change material (n-octadecane) on a large format (52.3 Ah) lithium-ion (Li-ion) pouch battery at different discharge rates (3C, 4C and 5C). Numerical simulations were conducted in ANSYS FLUENT software with Newman, Tiedemann, Gu and Kim (NTGK) model. By combining two PCM layers next to a cell, the maximum temperature was decreased significantly. Additionally, the temperature uniformity reached 10 ℃ under 3C rate.