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Search Results: 1 - 10 of 16586 matches for " Su Yeong Gwon "
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Remote Gaze Tracking System on a Large Display
Hyeon Chang Lee,Won Oh Lee,Chul Woo Cho,Su Yeong Gwon,Kang Ryoung Park,Heekyung Lee,Jihun Cha
Sensors , 2013, DOI: 10.3390/s131013439
Abstract: We propose a new remote gaze tracking system as an intelligent TV interface. Our research is novel in the following three ways: first, because a user can sit at various positions in front of a large display, the capture volume of the gaze tracking system should be greater, so the proposed system includes two cameras which can be moved simultaneously by panning and tilting mechanisms, a wide view camera (WVC) for detecting eye position and an auto-focusing narrow view camera (NVC) for capturing enlarged eye images. Second, in order to remove the complicated calibration between the WVC and NVC and to enhance the capture speed of the NVC, these two cameras are combined in a parallel structure. Third, the auto-focusing of the NVC is achieved on the basis of both the user’s facial width in the WVC image and a focus score calculated on the eye image of the NVC. Experimental results showed that the proposed system can be operated with a gaze tracking accuracy of ±0.737°~±0.775° and a speed of 5~10 frames/s.
Superstability of generalized cauchy functional equations
Lee Young-Su,Chung Soon-Yeong
Advances in Difference Equations , 2011,
Abstract: In this paper, we consider the stability of generalized Cauchy functional equations such as Especially interesting is that such equations have the Hyers-Ulam stability or superstability whether g is identically one or not. 2000 Mathematics Subject Classification: 39B52, 39B82.
Stability of Quartic Functional Equations in the Spaces of Generalized Functions
Lee Young-Su,Chung Soon-Yeong
Advances in Difference Equations , 2009,
Abstract: We consider the general solution of quartic functional equations and prove the Hyers-Ulam-Rassias stability. Moreover, using the pullbacks and the heat kernels we reformulate and prove the stability results of quartic functional equations in the spaces of tempered distributions and Fourier hyperfunctions.
Stability of Quartic Functional Equations in the Spaces of Generalized Functions
Young-Su Lee,Soon-Yeong Chung
Advances in Difference Equations , 2009, DOI: 10.1155/2009/838347
Abstract: We consider the general solution of quartic functional equations and prove the Hyers-Ulam-Rassias stability. Moreover, using the pullbacks and the heat kernels we reformulate and prove the stability results of quartic functional equations in the spaces of tempered distributions and Fourier hyperfunctions.
Stability of Cubic Functional Equation in the Spaces of Generalized Functions
Young-Su Lee,Soon-Yeong Chung
Journal of Inequalities and Applications , 2007, DOI: 10.1155/2007/79893
Abstract: In this paper, we reformulate and prove the Hyers-Ulam-Rassias stability theorem of the cubic functional equation f(ax+y)+f(ax ¢ ’y)=af(x+y)+af(x ¢ ’y)+2a(a2 ¢ ’1)f(x) for fixed integer a with a ¢ ‰ 0, ±1 in the spaces of Schwartz tempered distributions and Fourier hyperfunctions.
Acculturative and Psychosocial Predictors of Academic-Related Outcomes among Cambodian American High School Students
Khanh Dinh,Traci L. Weinstein,Su Yeong Kim
Journal of Southeast Asian American Education and Advancement , 2008,
Abstract: This study examined the acculturative and psychosocial predictors of academic-related outcomes among Cambodian American high school students from an urban school district in the State of Massachusetts. Student participants (N = 163) completed an anonymous survey that assessed demographic characteristics, acculturative experiences, intergenerational conflict, depression, and academic-related outcomes. The main results indicated that acculturative and psychosocial variables were significant predictors of academic-related outcomes. Specifically, Cambodian and Anglo/White cultural orientations and depression played significant roles across the four dimensions of academic-related outcomes, including grade point average, educational aspirations, beliefs in the utility of education, and psychological sense of school membership. This study provides important implications for school-based and family-based prevention and intervention programs in addressing the acculturative and academic challenges faced by Cambodian American students.
Stationary Vector Autoregressive Representation of Error Correction Models  [PDF]
Yun-Yeong Kim
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.22027
Abstract: The paper introduces a stationary vector autoregressive (VAR) representation of the error correction model (ECM). This representation explicitly regards the cointegration error a dependent variable, making the direct implementation of standard dynamic analyses using standard VAR models possible, particularly with respect to the cointegration error. Of course, an ECM does not have an explicit VAR form, and thus, it is not convenient for conducting such dynamic analyses. In this regard, we transform the original nonstationary VAR model into a VAR model with the cointegration error and stationary variables. Finally, we employ the model to dynamically analyze the real exchange rate between the US dollar and the Japanese yen.
Optimal Foreign Exchange Risk Hedging: A Mean Variance Portfolio Approach  [PDF]
Yun-Yeong Kim
Theoretical Economics Letters (TEL) , 2013, DOI: 10.4236/tel.2013.31001
Abstract:


This paper introduces the optimal foreign exchange risk hedging model following a standard portfolio theory. The results indicate that a lower level of risk can be achieved, given a specified level of expected return, from using optimization modeling. In the paper the expected hedging return is defined from the expected cost of the foreign currency using a specified hedging strategy minus the expected cost of the foreign currency when it is purchased form the spot market. The focal point of the technique is its ability to identify optimal combinations of hedging vehicles, those are currency options, forward contracts, leaving the position open (foreign exchange risk hedging tools suggested by the US. Department of Commerce) in a closed form.


Fixture Design to Supplement Machining and Fuel Cell Education  [PDF]
Yeong Ryu, Hazem Tawfik
Engineering (ENG) , 2017, DOI: 10.4236/eng.2017.95022
Abstract: A vital part of enhancing the ability of students to learn about advanced fabrication techniques is identifying the barriers to the student’s entry and excelling in the manufacturing field. In the Manufacturing and Mechanical Technology fields, there exists an intimidating experience gap or barrier between professionals and novice students. The students’ participation in the design and fabrication of a fixture for manufacturing a mechanical part will aid in eliminating this barrier by making fuel cell’s bipolar plates production accessible to inexperienced technology students. The process of manufacturing a fixture for the production of hydrogen fuel cell and hydrogen purifier plates required a careful planning and step-by-step methodological implementation. Through the use of our designed fixture, it is now possible to teach students how to use a CNC milling machine with relative ease while also allowing for precision part machining. The setup of the fixture allows students to observe the necessary measures to properly machine a part while also teaching them the benefits of fixtures in the manufacturing industry. In summary, the purpose of this paper is to provide the students with applied learning experience through involving them in the design and fabrication of a multi-disciplinary mechanical fixture and the utilization of practice oriented teaching resources in a full scale learning environment.
Optimal Foreign Exchange Risk Hedging: Closed Form Solutions Maximizing Leontief Utility Function  [PDF]
Yun-Yeong Kim
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.814181
Abstract: In this paper, we extend Kim (2013)for the optimal foreign exchange (FX) risk hedging solution to the multiple FX rates and suggest its application method. First, the generalized optimal hedging method of selling/buying of multiple foreign currencies is introduced. Second, the cost of handling forward contracts is included. Third, as a criterion of hedging performance evaluation, there is consideration of the Leontief utility function, which represents the risk averseness of a hedger. Fourth, specific steps are introduced about what is needed to proceed with hedging. There is a computation of the weighting ratios of the optimal combinations of three conventional hedging vehicles, i.e., call/put currency options, forward contracts, and leaving the position open. The closed form solution of mathematical optimization may achieve a lower level of foreign exchange risk for a specified level of expected return. Furthermore, there is also a suggestion provided about a procedure that may be conducted in the business fields by means of Excel.
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