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Keizan, South Korea

Bai S.-E.,Yeungnam University | Shim J.-S.,Yeungnam University | Lee C.-H.,Yeungnam University | Bai C.-H.,Yeungnam University | Shin K.-Y.,Daegu Future College
Japanese Journal of Applied Physics | Year: 2014

In this study, experiments on liquid transfer were performed to observe the change of the surface contact angle with respect to the process speed. The liquid transfer ratio from the experiments was compared with that from numerical simulation for low speed ranges. While the surface contact angle on the lower plate was almost constant in the experiment regardless of operating speed, the surface contact angle on the upper plate was found to be significantly changed during the process at the low speed ranges. This resulted in a reduction of the transfer ratio. By applying the timedependent values of contact angle to the numerical simulation model, the transfer ratio showed better agreement with the experimental results. The dynamic effect of surface contact angle should be considered as an additional variable, especially for the analysis of liquid transfer in a low speed printing process. © 2014 The Japan Society of Applied Physics. Source


Suh B.,University of California at Davis | Chang Y.H.,Induk University | Han S.B.,Induk University | Chung Y.J.,Daegu Future College
International Journal of Automotive Technology | Year: 2012

The plug-in hybrid electric bus (HEB) is designed to overcome the vulnerable driving range and performance limitations of a purely electric vehicle (EV) and have an improved fuel economy and lower exhaust emissions than those of a conventional bus and convention HEBs. The control strategy of the plug-in parallel HEB's complicated connected propulsion system is one of the most significant factors for achieving a higher fuel economy and lower exhaust emissions than those of the HEV. The proposed powertrain control strategy has flexibility in adapting to the battery's state of charge (SOC), exhaust emissions, classified driving patterns, driving conditions, and engine temperature. Simulation is required to model hybrid powertrain systems and test and develop powertrain control strategies for the plug-in parallel HEB. This paper describes the simulation analysis tools, powertrain components' models and modifications, simulation procedure, and simulation results. © 2012 The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg. Source


Kim H.Y.,Seoul Regional Korea Food and Drug Administration | Choi S.H.,Seoul Regional Korea Food and Drug Administration | Chung S.Y.,Seoul Regional Korea Food and Drug Administration | Choi H.J.,Seoul Regional Korea Food and Drug Administration | And 9 more authors.
Korean Journal of Food Science and Technology | Year: 2011

The purpose of this study was to develop a methodology to detect spinosad which are difficult to analyze by multi-component simultaneous analysis of pesticide residues. We monitored spinosad due to the paucity of related information. The spinosad was determined using HPLC with UV detector at 250 nm. Correlation coefficient (r2) for standard curve of spinosad A and D at standard concentration of 0.1-5.0 mg/kg were 0.999, respectively. Limit of quantitation (LOQ) of HPLC analysis was 0.005 mg/kg while limit of detection (LOD) was 0.001 mg/kg. Recovery experiments were conducted on five representative agricultural products to validate the analytical method. The recovery of proposed methods ranged from 74.9% to 104.0% and relative standard deviations were less than 10%. Spinosad residues were investigated in 16 commodities collected from 22 provinces. In this study, residues on all samples were not detected. © The Korean Society of Food Science and Technology. Source


Suh B.,University of California at Davis | Frank A.,University of California at Davis | Chung Y.J.,Daegu Future College | Lee E.Y.,Kunsan National University | And 2 more authors.
International Journal of Automotive Technology | Year: 2011

This research concerns the design of a powertrain system for a plug-in parallel diesel hybrid electric bus equipped with a continuously variable transmission (CVT) and presents a new design paradigm for the plug-in hybrid electric bus (HEB). The criteria and method for selecting and sizing powertrain components equipped in the plug-in HEB are presented. The plug-in HEB is designed to overcome the vulnerable limitations of driving range and performance of a purely electric vehicle (EV), and it is also designed to improve the fuel economy and exhaust emissions of conventional buses and conventional HEBs. Optimization of the control strategy for the complicated and interconnected propulsion system in the plug-in parallel HEB is one of the most significant factors for achieving higher fuel economy and lower exhaust emissions in the hybrid electric vehicle (HEV). In this research, the proposed control strategy was simulated to prove its validity using the ADVISOR (advanced vehicle simulator) analysis simulation tool. © 2011 The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg. Source


Han S.B.,Induk University | Chang Y.H.,Induk University | Lee E.Y.,Kunsan National University | Chung Y.J.,Daegu Future College | Suh B.,University of California at Davis
International Journal of Automotive Technology | Year: 2010

Hybrids combine a combustion engine with an electric motor and battery. The two technologies can be combined to reduce fuel consumption and exhaust emissions. This paper presents the concept of hybrid electric vehicles (HEVs) applied to truck or van vehicles with diesel engines. The simulation results from the advanced vehicle simulator (ADVISOR) demonstrate that the required power may be properly shared between the internal combustion engine and electric motor. The simulation can also be used to prove that the technique is useful for improvements in driving performance; additionally, the technique is suitable for hybrid electric vehicles, allowing for good fuel economy and low emissions performance. © 2010 The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg. Source

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