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East Asia Free Trade Area: From ASEAN Plus One Perspective
Tran Nhuam Kien 대구대학교 경제경영연구소 2006 경제경영연구 Vol.4 No.1
This paper analyzes reasons and motivations for the initiative of the ASEAN+1 FTAs in the context of East Asia's regional economic integrating that such initiative marks the commencement of an East Asian FTA, and in succession triggers the East Asian economic integration, which will balance the two major regional arrangements in the world, EU and NAFTA. Using a gravity model, I have examined whether ASEAN+1 FTAs are trade creation or trade diversion between member and non member countries on the way of forming FTAs in East Asia. The empirical results in the paper suggest two important conclusions. First, GDP, population, area of member countries as well as distance and language connection show significant for East Asia regional trade. Second, all ASEAN+1 FTAs are open to trade with the rest of the world (i.e., no trade diversion). However, the establishment of ASEAN+1 FTAs would worsen the trade balances of member counties with the United States and Japan.
A New Approach for Micro-WEDM Control based on Real-Time Estimation of Material Removal Rate
Kien Trung Hoang,양승한 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.2
This paper describes a new approach for controlling a micro wire electrical discharge machining (μ-WEDM) process. In thisapproach, the relative feedrate of electrodes was controlled based on the real-time estimation of material removal rate and theidentification of the workpiece height. An assisted vibration was applied to the workpiece, eliminating the limitation of a smalldischarge gap. This allows the electrode to be moved continuously, which cannot be performed in conventional WEDM. To verify theefficiency of the system, two workpieces with different shapes were used. For one workpiece, the height was varied linearly, whereasfor the other, the height was varied non-linearly. The discharge current, discharge voltage, and number of discharge pulses weremeasured using current and voltage probes. The signal was uploaded to a computer through data acquisition devices, and a LabVIEWprogram was developed to estimate the feedrate and control the stages. The experimental results showed that the developed systemworked effectively, with high machining stability and efficiency.
Solving and Resolving the East China Sea Dispute: Beijing`s Options
( Kien Hong Yu ) 한국국방연구원 2005 The Korean Journal of Defense Analysis Vol.17 No.3
In early 2005, the East China Sea (ECS) became a hotly-disputed area. mainly between the People`s Republic of China (PRC) and Japan. especially in view of the fact that in August 2005, for the first time in history, the price of light, sweet crude oil futures for October 2005 delivery on the New York Mercantile Exchange (NYMEX) crossed the US$70 per barrel mark. This paper explores what Beijing would likely do to solve or resolve its dispute with Tokyo, if not Taipei as well. It suggests, as a first step, the creation of a series of either international or bicoastal regimes, including between mainland China and Taiwan, which should be able to reduce tension between all the parties. By examining the PRC`s past words and deeds, the author has inductively pointed out options that mainland China can choose from to handle the dispute, such as dragging on as well as making compromises or adopting a fifty-fifty formula. Arguably, the PRC will try to solve or resolve the dispute in a peaceful way. In other words, it may first provoke, but not by firing the first shot. The Chinese Communist leaders are still adhering to their "paramount leader," Deng Xiaoping`s strategy of peace and development. In short, Beijing may have to make some concessions to Japan and/or Taipei for the sake of all concerned.
Kien Nguyen, T.,Nguyen, V.D.,Seong, B.,Hoang, N.,Park, J.,Byun, D. Pergamon Press 2014 Journal of aerosol science Vol.71 No.-
Electrospray and electrohydrodynamic (EHD) jet have been paid much attention to produce fine droplets or particles. However, although applying a constant voltage, meniscus fluctuation may occur because of the variation in electric field. There are various reasons for the change in electric field such as distance between a nozzle to a substrate, wetting condition, pressure drop, and liquid vaporization. The fluctuation of the meniscus during jetting may cause unstable jetting and spray, which results in non-uniform patterning or coating. To tackle this problem, this paper introduces an advanced control of applied voltage that keeps the meniscus stable. An image processing method called meniscus characterization is used to provide information about the meniscus shape to a controller as a feedback signal. In addition, this meniscus information is also used to evaluate an optimal voltage that is applied to the nozzle to improve the startup time in the spray and EHD ejection. The experiment results show that the shape of meniscus is stably maintained, the jetting and the electrospray also become stable and the jet startup time is reduced.
Kien Trung Hoang,Satish Kumar Gopalan,양승한 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
Micro-electrical discharge machining (μ-EDM) has recently received increased attentions in high precision machining and micro manufacturing. Since μ-EDM is a very complex process, it is difficult to develop a comprehensive model to analyze and predict its characteristics. This makes μ-EDM more difficult to control and requiring high skilled, experienced operators. Although electro-thermal modelshave been developed to estimate the material removal rate, tool wear ratio and surface roughness of the μ-EDM process, since they arebased on the usage of incorrect value of fraction of energy distributed to electrodes the estimations deviate significantly from the experimentalresults. This paper presents an experimental study of the fraction of energy distributed to the electrodes of a μ-EDM processwhere the material of both electrodes and dielectric are in concern. The fractions of the energy are estimated using an electro-thermalmodel based on controllable parameters, and were simplified by empirical models for investigation and comparison.