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Two new species of Camellia (Theaceae) from Vietnam
Lieu Thi Nguyen,Ninh Tran,Uematsu CHIYOMI,Katayama HIRONORI,Dung Van Luong,Son Thanh Hoang,Ky Danh NGUYEN,Hung Viet NGUYEN,Toan Canh THAI 한국식물분류학회 2018 식물 분류학회지 Vol.48 No.2
Two new species of Camellia (Theaceae) are described from Vietnam: Camellia vuquangensis Luong, Tran & L. T. Nguyen and Camellia hatinhensis Luong, Tran & L. T. Nguyen. The new taxa were col- lected from Vu Quang National Park in the center of Vietnam. The new finds are morphologically dissimilar to all known Camellia species. Recent Camellia discoveries have increased the number of species recorded in Viet- nam from 50 to 75, making Vietnam a center of diversity and a crucial area for more research into the diversity and distributions of Camellia.
Canh Toan Nguyen,Ngoc Linh Nguyen,이형석,김대경,이충한,문형필,구자춘,남재도,한정헌,최혁렬 한국고분자학회 2013 Macromolecular Research Vol.21 No.1
The synthetic elastomer based on acrylonitrile butadiene rubber (NBR) has been recently developed as a kind of dielectric elastomer actuators (DEAs). Its advantages are that its properties can be modified according to the requirements of applications. In this paper, we report a comprehensive study on the effects of plasticizers including diisodecyl phthalate (DIDP), dioctyladipate (DOA), and dioctyl phthalate (DOP) as well as a high dielectric additive,which is, barium titanate (BaTiO3) with respect to the overall performance of the synthetic elastomer. We investigate how the significant parameters representing the actuator performance can be changed according to the composition of the additives and how the actuation performances can be improved. In addition, we address how the environmental conditions such as exposure to the light and the air have influence on the properties of the synthetic elastomer, and a method for extending the lifetime of DEA is also addressed.
Multiple-degrees-of-freedom dielectric elastomer actuators for soft printable hexapod robot
Nguyen, Canh Toan,Phung, Hoa,Nguyen, Tien Dat,Jung, Hosang,Choi, Hyouk Ryeol Elsevier 2017 Sensors and actuators. A Physical Vol.267 No.-
<P><B>Abstract</B></P> <P>In this paper, we present the development of a printable hexapod walking robot driven by the multiple-degrees-of-freedom (multi-DOF) soft actuators based on dielectric elastomer. The multi-DOF soft actuators are employed to provide versatile movements including two translations and single rotation within a simple structure based on the antagonistic configuration of two elastomer membranes. The soft actuators demonstrate the potential of being used as a multifunctional joint to actuate the robot leg’s motion which biologically mimics the animal’s walking posture. The actuator performances are enhanced by developing the novel mixed silicone compound, Wacker P7670 and Nusil CF2-2186, and applying the optimized prestrain to the silicone-based actuator membranes. A theoretically and experimentally comprehensive study was carried out to investigate the soft actuators performances in terms of linear displacements, deflection angle, output force, torque, dynamic response, and load carrying capability. We successfully demonstrated the robot’s locomotion on the flat rigid surfaces with the forward and backward walking movements at an average speed of 3cm/s (about 12 body-lengths/min) using the alternating tripod walking gait of insects.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The application of the multiple-degrees-of-freedom (multi-DOF) soft actuators based on dielectric elastomer in driving the locomotion of a hexapod walking robot is presented in this paper. </LI> <LI> The actuator performances are significantly enhanced by replacing the synthetic elastomer with the novel mixed silicone compound, Wacker P7670 and Nusil CF2-2186, and applying the optimized prestrain to the silicone-based actuator membranes. </LI> <LI> The hexapod robot’s fabrication process is implemented using 3D printing technology which provides the lightweight, scalable, and easy-to-manufacture characteristic of the robot. </LI> <LI> A theoretically and experimentally comprehensive study is carried out to investigate the soft actuators performances in terms of linear displacements, deflection angle, output force, torque, dynamic response, and load carrying capability. </LI> <LI> The hexapod robot’s locomotion on flat rigid surfaces with the forward and backward walking movements at an average speed of 3cm/s (about 12 body-lengths/min) using the alternating tripod walking gait of insects is successfully demonstrated. </LI> </UL> </P>
Musclelike joint mechanism driven by dielectric elastomer actuator for robotic applications
Jung, Ho Sang,Cho, Kyeong Ho,Park, Jae Hyeong,Yang, Sang Yul,Kim, Youngeun,Kim, Kihyeon,Nguyen, Canh Toan,Phung, Hoa,Hoang, Phi Tien,Moon, Hyungpil,Koo, Ja Choon,Choi, Hyouk Ryeol Institute of Physics Publishing 2018 Smart materials & structures Vol.27 No.7
<P>The purpose of this study is to develop an artificial muscle actuator suitable for robotic applications, and to demonstrate the feasibility of applying this actuator to an arm mechanism, and controlling it delicately and smoothly like a human being. To accomplish this, we perform the procedures that integrate the soft actuator, called the single body dielectric elastomer actuator, which is very flexible and capable of high speed operation, and the displacement amplification mechanism called the sliding filament joint mechanism, which mimics the sliding filament model of human muscles. In this paper, we describe the characteristics and control method of the actuation system that consists of actuator, mechanism, and embedded controller, and show the experimental results of the closed-loop position and static stiffness control of the robotic arm application. Finally, based on the results, we evaluate the performance of this application.</P>