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Non-Jumping Take off Performance in Beetle Flight （Rhinoceros Beetle Trypoxylus dichotomus）

Journal of Bionic Engineering 2014年第1期11卷 61-71页

作者： Tien van truong Tuyen Quang Le Hoon Cheol Park Kwang Joon Yoon Min Jun Kim doyoung Byun Department of Aerospace and Information Engineering Konkuk University Seoul South Korea Department of Mechanical Engineering National University of Singapore Singapore KoreaInstitute of Ocean Science and Technology PO Box 29 Ansan 425-600 South Korea Department of Advanced Technology Fusion Konkuk University Seoul South Korea Department of Mechanical Engineering and Mechanics Drexel University Philadelphia PA 19104 USA Department of Mechanical Engineering Sungkyunkwan University Suwon South Korea

In recent decades, the take-off mechanisms of flying animals have received much attention in insect flight initiation. Most of previous works have focused on the jumping mechanism, which is the most common take-off mechanism found in flying animals. Here, we presented that the rhinoceros beetle, Trypoxylus dichotomus, takes offwithout jumping. In this study, we used 3-Dimensional （3D） high-speed video techniques to quantitatively analyze the wings and body kinematics during the initiation periods of flight. The details of the flapping angle, angle of attack of the wings and the roll, pitch and yaw angles of the body were investigated to understand the mechanism of take-off in T. dichotomus. The beetle took off gradually with a small velocity and small acceleration. The body kinematic analyses showed that the beetle exhibited stable take-off. To generate high lift force, the beetle modulated its hind wing to control the angle of attack; the angle of attack was large during the upstroke and small during the downstroke. The legs of beetle did not contract and strongly release like other insects. The hind wing could be con- sidered as a main source of lift for heavy beetle.

关键词： take-oft non-jumping mechanism rhinoceros beetle kinematics

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Flow Visualization of Rhinoceros Beetle （Trypoxylus dichotomus） in Free Flight

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Journal of Bionic Engineering 2012年第3期9卷 304-314页

作者： Tien van truong Tuyen Quang Le Hieu Trung Tran Hoon Cheol Parka Kwang Joon Yoon doyoung Byun . Department of Aerospace Information Engineering Konkuk University Seoul 143-70 l Republic of Korea 2.Costal Engineering and Ocean Energy Research Department Korea Ocean Research and Development Institute 454 Haeanro Sangrok-gu Ansan 426-744 Republic of Korea Department of Advanced Technology Fusion Konkuk University Seoul 143-701 Republic of Korea Department of Mechanical Engineering Sungkyunkwan University Suwon 440-746 Republic of Korea

Aerodynamic characteristics of the beetle, Trypoxylus dichotomus, which has a pair of elytra （forewings） and flexible hind wings, are investigated. Visualization experiments were conducted for various flight conditions of a beetle, Trypoxylus di- chotomus： free, tethered, hovering, forward and climbing flights. Leading edge, trailing edge and tip vortices on both wings were observed clearly. The leading edge vortex was stable and remained on the top surface of the elytron for a wide interval during the downstroke of free forward flight. Hence, the elytron may have a considerable role in lift force generation of the beetle. In addition, we reveal a suction phenomenon between the gaps of the hind wing and the elytron in upstroke that may improve the positive lift force on the hind wing. We also found the reverse clap-fling mechanism of the T. dichotomus beetle in hovering flight. The hind wings touch together at the beginning of the upstroke. The vortex generation, shedding and interaction give a better understanding of the detailed aerodynamic mechanism of beetle flight.

关键词： beetle smoke wire visualization free flight hovering flight wing interaction elytron effect

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Autophagy modulates physiologic and adaptive response in the liver

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Liver Research 2023年第4期7卷 304-320页

作者： Trinh van Le Nhung Hai truong Ai Xuan L.Holterman Laboratory of Stem Cell Research and Application University of Science-VNUHCMHo Chi Minh CityVietnam Vietnam National University Ho Chi Minh CityVietnam Faculty of Biology and Biotechnology University of Science-VNUHCMHo Chi Minh CityVietnam Department of Pediatrics and Surgery University of Illinois College of MedicineChicago and PeoriaILUSA

Autophagy is a physiological process that is ubiquitous and essential to the disposal or recycling of damaged cellular organelles and misfolded proteins to maintain organ homeostasis and *** importance in the regulation of liver function in normal and pathological conditions is increasingly *** review summarizes how autophagy regulates epithelial cell-and non-epithelial cellspecific function in the liver and how it differentially participates in hepatic homeostasis,hepatic injury response to stress-induced liver damage such as cholestasis,sepsis,non-alcoholic and alcohol-associated liver disease,viral hepatitis,hepatic fibrosis,hepatocellular and cholangiocellular carcinoma,and ***-based interventional studies for liver diseases that are currently registered in *** are *** the broad and multidirectional autophagy response in the liver,a more refined understanding of the liver cell-specific autophagy activities in a context-dependent manner is necessary。

关键词： Autophagy Biliary epithelial cell Hepatitis Hepatocellular carcinoma Hepatic stellate cell Hepatocyte

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越南苦苣苔科植物四新记录种(英文)

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广西植物 2013年第3期33卷 395-400页

作者： do van truong 刘晟源韦毅刚温放越南国家自然博物馆维管束植物分类与多样性保育中心广西弄岗国家级自然保护区管理局广西龙州532400 广西壮族自治区中国科学院广西植物研究所广西桂林541006

报道了4个苦苣苔科(Gesneriaceae)植物在越南的分布新记录,其中1种为半蒴苣苔属(Hemiboea)的红苞半蒴苣苔(***),2种为报春苣苔属(Primulina Hance)的文采报春苣苔(***)和疏花报春苣苔(*** flora),还有1种为吊石苣苔属(Lysionotus)的桂... 详细信息

报道了4个苦苣苔科(Gesneriaceae)植物在越南的分布新记录,其中1种为半蒴苣苔属(Hemiboea)的红苞半蒴苣苔(***),2种为报春苣苔属(Primulina Hance)的文采报春苣苔(***)和疏花报春苣苔(*** flora),还有1种为吊石苣苔属(Lysionotus)的桂黔吊石苣苔(*** ynanthoides)。文中列出了每个种的标本引证和地理分布情况。

关键词：红苞半蒴苣苔桂黔吊石苣苔疏花报春苣苔文采报春苣苔新记录越南

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金喜楼梯草(荨麻科),越南楼梯草属植物一新种（英文）

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植物研究 2017年第3期37卷 321-324页

作者： do van truong 林云 TRAN Ngoc Hai 韦毅刚越南国家自然博物馆维管束植物分类与多样性保育中心河内100803 湖南省医药技工学校湖南食品药品职业学院长沙410208 越南国家林业大学河内100803 广西壮族自治区中国科学院广西植物研究所广西喀斯特植物保育与恢复生态学重点实验室桂林541006

对产自越南的荨麻科楼梯草属植物一新种金喜楼梯草(Elatostema kimhyense ***&***)作了描述和绘图。该种生长于海拔350~400和1 100~1 200 m的石灰岩山地林下。该新种与越南楼梯草(*** ***&***)接近,区别在于其拥有肉质茎,羽状脉,叶背面... 详细信息

对产自越南的荨麻科楼梯草属植物一新种金喜楼梯草(Elatostema kimhyense ***&***)作了描述和绘图。该种生长于海拔350~400和1 100~1 200 m的石灰岩山地林下。该新种与越南楼梯草(*** ***&***)接近,区别在于其拥有肉质茎,羽状脉,叶背面、苞片和小苞片被微硬毛。

关键词：楼梯草属分类学荨麻科越南

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Sigmoid函数的低复杂度概率分段线性拟合法

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西安电子科技大学学报 2020年第3期47卷 58-65页

作者： NGUYEN van-truong 蔡觉平魏琳育褚洁西安电子科技大学微电子学院陕西西安710071

针对传统的Sigmoid激活函数拟合方法准确度不高、消耗大量资源等问题,提出了一种基于各层神经元值分布概率的Sigmoid函数分段线性拟合方法,以便在仅使用加法电路的情况下,提高神经网络的识别精度。首先以Sigmoid函数的二阶导数为基础,将... 详细信息

针对传统的Sigmoid激活函数拟合方法准确度不高、消耗大量资源等问题,提出了一种基于各层神经元值分布概率的Sigmoid函数分段线性拟合方法,以便在仅使用加法电路的情况下,提高神经网络的识别精度。首先以Sigmoid函数的二阶导数为基础,将Sigmoid函数划分为3个固定区域;其次根据每层神经元值的概率变化,将每个固定区域的曲线再划分成不同数量、长度的子区域,以减少近似误差,提高识别精度。分段线性函数斜率设为2-n,有效地降低了Sigmoid函数的硬件实现复杂度。最后,设计了拟合函数的硬件电路结构,并在Xilinx FPGA-XC7A200T上实现MNIST手写数字识别,对所提出的拟合方法进行验证。实验结果表明,该方法的识别准确率在深度神经网络中约达到97.45%,而在卷积神经网络中约达到98.42%。与其他仅使用加法电路的拟合方法对比,准确率分别提高了约0.84%和0.57%。

关键词： Sigmoid函数概率神经网络分段线性拟合现场可编程门阵列

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How Could Beetle＇s Elytra Support Their Own Weight during Forward Flight？

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Journal of Bionic Engineering 2014年第4期11卷 529-540页

作者： Tuyen Quang Le Tien van truong Hieu TrungTran Soo Hyung Park Jin Hwan Ko Hoon Cheol Park doyoung Byun Korea Institute of Ocean Science and Technology Ansan P. O. Box 29 425-600 South Korea Institute of High Performance Computing 1 Fusionopolis Way Singapore 138632 Singapore Department of Aerospace and Information Engineering Konkuk University Seoul South Korea Department of Mechanical Engineering National University of Singapore Singapore Department of Advanced Technology Fusion Konkuk University Seoul South Korea Department of Mechanical Engineering Sungkyunkwan University Suwon South Korea

The aerodynamic role of the elytra during a beetle＇s flapping motion is not well-elucidated, although it is well-recognized that the evolution of elytra has been a key in the success of coleopteran insects due to their protective function. An experimental study on wing kinematics reveals that for almost concurrent flapping with the hind wings, the flapping angle of the elytra is 5 times smaller than that of the hind wings. Then, we explore the aerodynamic forces on elytra in free forward flight with and without an effect of elytron-hind wing interaction by three-dimensional numerical simulation. The numerical results show that vertical force generated by the elytra without interaction is not sufficient to support even its own weight. However, the elytron-hind wing interaction improves the vertical force on the elytra up to 80%; thus, the total vertical force could fully support its own weight. The interaction slightly increases the vertical force on the hind wind by 6% as well.

关键词： wing interaction elytra beetle free forward flight three-dimensional numerical simulation

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Artificial Intelligence Technique in Hydrological Forecasts Supporting for Water Resources Management of a Large River Basin in Vietnam

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Open Journal of Modern Hydrology 2023年第4期13卷 246-258页

作者： truong van Anh Faculty of Meteorology and Hydrology Hanoi University of Natural Resources and Environment Hanoi Vietnam

Hydrological forecasting plays an important role in water resource management, supporting socio-economic development and managing water-related risks in river basins. There are many flow forecasting techniques that have been developed several centuries ago, ranging from physical models, physics-based models, conceptual models, and data-driven models. Recently, Artificial Intelligence (AI) has become an advanced technique applied as an effective data-driven model in hydrological forecasting. The main advantage of these models is that they give results with compatible accuracy, and require short computation time, thus increasing forecasting time and reducing human and financial effort. This study evaluates the applicability of machine learning and deep learning in Hanoi water level forecasting where it is controlled for flood management and water supply in the Red River Delta, Vietnam. Accordingly, SANN (machine learning algorithm) and LSTM (deep learning algorithm) were tested and compared with a Physics-Based Model (PBM) for the Red River Delta. The results show that SANN and LSTM give high accuracy. The R-squared coefficient is greater than 0.8, the mean squared error (MSE) is less than 20 cm, the correlation coefficient of the forecast hydrology is greater than 0.9 and the level of assurance of the forecast plan ranges from 80% to 90% in both cases. In addition, the calculation time is much reduced compared to the requirement of PBM, which is its limitation in hydrological forecasting for large river basins such as the Red River in Vietnam. Therefore, SANN and LSTM are expected to help increase lead time, thereby supporting water resource management for sustainable development and management of water-related risks in the Red River Delta.

关键词： Hydrological Forecast Water Resources Management Machine Learning Deep Learning Red River Basin

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Adaptive Nonlinear PD Controller of Two-Wheeled Self-Balancing Robot with External Force

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Computers, Materials & Continua 2024年第11期81卷 2337-2356页

作者： van-truong Nguyen Dai-Nhan Duong Dinh-Hieu Phan Thanh-Lam Bui Xiem Hoangvan Phan Xuan Tan Faculty of Mechatronics SMAEHanoi University of IndustryHanoi159999Vietnam Faculty of Electronics and Telecommunications Vietnam National University-University of Engineering and Technology(VNU-UET)Hanoi10000Vietnam College of Engineering Shibaura Institute of TechnologyTokyo135-8548Japan

This paper proposes an adaptive nonlinear proportional-derivative(ANPD)controller for a two-wheeled self-balancing robot(TWSB)modeled by the Lagrange equation with external *** proposed control scheme is designed based on the combination of a nonlinear proportional-derivative(NPD)controller and a genetic algorithm,in which the proportional-derivative(PD)parameters are updated online based on the tracking error and the preset error *** addition,the genetic algorithm is employed to adaptively select initial controller parameters,contributing to system stability and improved control *** proposed controller is basic in design yet simple to *** ANPD controller has the advantage of being computationally lightweight and providing high robustness against external *** stability of the closed-loop system is rigorously analyzed and verified using Lyapunov theory,providing theoretical assurance of its *** and experimental results show that the TWSB robot with the proposed ANPD controller achieves quick balance and tracks target values with very small errors,demonstrating the effectiveness and performance of the proposed *** proposed ANPD controller demonstrates significant improvements in balancing and tracking performance for two-wheeled self-balancing robots,which has great applicability in the field of robot control *** represents a promising solution for applications requiring precise and stable motion control under varying external conditions.

关键词： Two-wheeled self-balancing robot nonlinear PD control external force genetic algorithm

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First Records of Megophrys daweimontis Rao and Yang, 1997 and Amolops vitreus(Bain, Stuart and Orlov, 2006)(Anura: Megophryidae, Ranidae) from Vietnam

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Asian Herpetological Research 2015年第1期6卷 66-72页

作者： Dzung Trung LE Anh van PHAM Son Hung Lan NGUYEN Thomas ZIEGLER truong Quang NGUYEN Faculty of Biology Hanoi National University of Education Faculty of Biology and Chemistry Tay Bac University AG Zoologischer Garten Kln Institute of Ecology and Biological Resources Vietnam Academy of Science and Technology

Two amphibian species,Megophrys daweimontisandAmolops vitreus,are recorded for the ifrst time from Vietnam, on the basis of a new amphibian collection from Dien Bien and Son La provinces. In addition, acoustic analysis ofA. vitreus is also provided based on the advertisement calls recorded in Muong Nhe Nature Reserve of Dien Bien Province, Vietnam.

关键词： Amolops vitreus Megophrys daweimontis new records advertisement call Dien Bien Province Son La Province

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