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Search Results: 1 - 10 of 698 matches for " Jihun Cha "
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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.
A note on del Pezzo fibrations of degree 1
Jihun Park
Mathematics , 2001,
Abstract: We study del Pezzo fibrations of degree 1 with terminal singularities. A connection between singularities on del Pezzo surfaces of degree 1 and Kodaira's classification of elliptic singular fibers will be studied in this paper. By this investigation we obtain several results on birational maps of del Pezzo fibrations of degree 1 with terminal singularities.
Birational maps of del Pezzo fibrations
Jihun Park
Mathematics , 1999,
Abstract: In this paper, we study rigidity of nonsingular del Pezzo fibrations over a germ of smooth curve.
Investigative Report for Economists; “Prediction of Stock Market” and Functional “Invisible Hand” and “Law of Supply and Demand”  [PDF]
Deoksoo Cha
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.66120
Abstract: This paper is an innovative scientific report about the following economic problems. It considers why the stock price cannot be predicted and the function of the invisible hand and the law of supply and demand. Incidentally, it is possible to solve these by other science, for example, the systems’ analysis theory in engineering. Therefore, economic science is very rational or systematic economic systems are not black boxes. It cannot be solved with traditional science but with other science, and proved with simulations. This scientific research has the potential to be sensational for economic development; therefore, scientists across the world must be informed about its solution.
The Advanced Solution for Mission of Complexity  [PDF]
Deoksoo Cha
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.87072
Abstract: This paper provides a clarification of the advanced solution for the mission of complexity in science, which was previously published in 2015; but the new solution is too difficult to scientists; for this, this paper describes the academic reasoning and the relevant scientific background behind solution. Moreover, it shows that the solution can be simulated the complex systems by the computer program MATLAB Simulink or an analog-type simulator under virtual circumstances. Thus, this paper verifies that the new solution has validity and superiority; additionally, it must replace the established older chaos theory with the advanced solution in future, so that this new solution is disadvantageous to many chaos physicists and the famous organization SFI, and others. However, they must suspend their work on complexity, because the complexity is a solvable problem in science.
Factorial hypersurfaces in P^4 with nodes
Ivan Cheltsov,Jihun Park
Mathematics , 2005,
Abstract: We prove that for n= 5, 6, 7, a nodal hypersurface of degree n in P^4 is factorial if it has at most (n-1)^2-1 nodes.
Birationally rigid Fano threefold hypersurfaces
Ivan Cheltsov,Jihun Park
Mathematics , 2013,
Abstract: We prove that every quasi-smooth hypersurface in the 95 families of weighted Fano threefold hypersurfaces is birationally rigid.
Log Canonical Thresholds and Generalized Eckardt Points
Ivan Cheltsov,Jihun Park
Mathematics , 2000,
Abstract: Let $X$ be a smooth hypersurface of degree $n\geq 3$ in $\mathbb{P}^n$. We prove that the log canonical threshold of $H\in|-K_X|$ is at least $\frac{n-1}{n}$. Under the assumption of the Log minimal model program, we also prove that a hyperplane section $H$ of $X$ is a cone in $\mathbb{P}^{n-1}$ over a smooth hypersurface of degree $n$ in $\mathbb{P}^{n-2}$ if and only if the log canonical threshold of $H$ is $\frac{n-1}{n}$.
Log canonical thresholds on Gorenstein canonical del Pezzo surfaces
Jihun Park,Joonyeong Won
Mathematics , 2009, DOI: 10.1017/S001309150900039X
Abstract: We classify all the effective anticanonical divisors on weak del Pezzo surfaces. Through this classification we obtain the smallest number among the log canonical thresholds of effective anticanonical divisors on a given Gorenstein canonical del Pezzo surface.
Weighted Fano threefold hypersurfaces
Ivan Cheltsov,Jihun Park
Mathematics , 2005,
Abstract: We study birational transformations into elliptic fibrations and birational automorphisms of quasismooth anticanonically embedded weighted Fano 3-fold hypersurfaces having terminal singularities classified by A.R. Iano-Fletcher, J. Johnson, J. Kollar, and M. Reid.
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