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A novel design technique for IPMC diaphragm in micropump application
Doan Ngoc Chi Nam,Yoon Jong Il,Ahn Kyoung Kwan 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Micropumps have gained a great potential to be applied as biomedical devices and micro systems. Because of low driven voltage, flexible operation, and self sensing ability, the ionic polymer metal composite (IPMC) material has been used as diaphragm of micropumps. This paper presents a novel design technique of IPMC diaphragm with numerical results about deformation capabilities and makes the design process of IPMC diaphragm be more convenient. The technique starts from a physical induced stress model of IPMC actuators, where the induced stress information inside the IPMC can be obtained corresponding to the input voltage signal. The induced stress model is achieved by solving the partial differential equation (PDE) of charging density along the IPMC thickness. Next, the induced stress information is imported into the ANSYS finite element model as deforming mechanism. Via ANSYS environment, the deformation of IPMC actuator can be visually analyzed. Using this technique, a novel design of IPMC diaphragm is then investigated and the optimized design of IPMC diaphragm for micropump is obtained.
Doan Ngoc Chi Nam,Dinh Quang Truong,Yoon Jong Il,Ahn Kyoung Kwan 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
An ionic polymer metal composite (IPMC) actuator is an Electro-Active Polymer (EAP) that bends in response to a small applied electrical field as a result of mobility of cations in the polymer network. This paper proposes a dynamic fuzzy Nonlinear Auto Regressive Exogenous (NARX) model for modeling and identifying the nonlinear behavior of on type IPMC actuator. Firstly, a set of open loop input voltage signals were applied to the IPMC in order to investigate the IPMC bending actuation. Consequently, a proper fuzzy NARX model was constructed and an identification scheme based on Particle Swam Optimization (PSO) algorithm was developed. Validation results proved the ability of proposed scheme to capture the bending behaviors of IPMC actuator.
Quantifying the Effect of Economic Sanctions on Trade in Cultural Goods
Doan Ngoc Thang,Tran Manh Ha 한국국제경제학회 2023 International Economic Journal Vol.37 No.3
The question of whether the imposition of economic sanctions impairs or nurtures cultural affinity remains controversial. In effect, this paper investigates the effect of economic sanctions on the trade of cultural goods as a proxy for cultural proximity, using cross-country data with 5,304 country pairs ranging from the years 1996–2019. Through extensive robustness checks, our main findings reveal that economic sanctions drive up the trade of cultural goods. The effect on the trade of cultural goods is heterogeneous across various forms of economic sanctions. While military, arms, trade, and travel sanctions are trade facilitators, financial and other sanctions are trade barriers. These effects are conditional on the level of economic development in the sanctioned countries and change over time. Our findings suggest cultural implications of economic sanctions in foreign policy design.
Precision Control for Ionic Polymer Metal Composite Actuator Based on Quantitative Feedback Theory
Doan Ngoc Chi Nam,Dinh Quang Truong,Yoon Jong Il,Ahn Kyoung Kwan 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
An ion polymer metal composite (IPMC) is an Electro-Active Polymer (EAP) that bends in response to a small applied electrical field as a result of mobility of cations in the polymer network and vice versa. Recently, IPMC is widely applied in many fields such as biometric, biomedical and micro manipulator fields. This paper proposes a robust position controller for IPMCs which is based on the quantitative feedback theory (QFT). Firstly, the IPMC actuation was investigated. The PRBS input voltage signals were applied to the IPMC in order to identify the system characteristic. Consequently, the QFT controller for the IPMC was designed from the identified IPMC model. Experiments were carried out to validate the effectiveness of proposed controller applied to the IPMC.
Doan Ngoc Chi Nam,Jong Il Yoon,Dinh Quang Truong,Kyoung Kwan Ahn 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
An ionic polymer metal composite (IPMC) actuator is an Electro-Active Polymer (EAP) that bends in response to a small applied electrical field as a result of mobility of cations in the polymer network. This paper proposes a cascaded model of Preisach operator and fuzzy Nonlinear Auto Regressive Exogenous (NARX) structure for modeling and identifying the nonlinear behavior of on type IPMC actuator. Firstly, a set of open loop input voltage signals were applied to the IPMC in order to investigate the IPMC bending actuation. Consequently, Secondly, a proper Preisach type fuzzy NARX model is developed with one input and one output to estimate the IPMC tip displacement. By employing the collected training data, an identification scheme based on incorporation of least square method and Particle Swarm Optimization (PSO) algorithm is then carried out to tune the model parameters.
Gender and Innovation in Southeast Asia
Thi Ngoc Thuy DOAN,Chia-Hua CHANG 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6
This study examines how female managers or owners impact a firm’s innovation. Moreover, this research examines the role of absorptive capacity with R&D as a proxy in moderating the female managers/owners-innovation relationship. This study uses firm-level data from the World Bank Enterprise Surveys. The final sample consists of 4,438 firms in manufacturing industries in 2015–2016 across nine Southeast Asian economies (Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Thailand, Timor Leste, and Vietnam). The research adopts the multilevel mixed-effects logistic regression technique to deal with the hierarchical data structure issue, which is not addressed in the traditional binary choice regression technique (logistic or probit regression). The results show that firms led by female managers have a higher possibility to innovate. Female ownership is also positively associated with innovation propensity. The positive effects of female managers on a firm’s innovation are enhanced by R&D activities. Besides, R&D also strengthens the positive effects of female owners on a firm’s innovation. This study contributes as probably the first to develop the theoretical argument that R&D can positively moderate the gender–innovation link. Furthermore, from an empirical standpoint, the current study contributes as the first research on this topic in the Southeast Asian region.