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Search Results: 1 - 10 of 47908 matches for " Ying-Cheng Hung "
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University-Industry Business Incubators in Taiwan  [PDF]
Wen-Bo Wang, Ying-Cheng Hung, Chu-Ching Wang
Open Journal of Business and Management (OJBM) , 2013, DOI: 10.4236/ojbm.2013.11001
Abstract: According to World Economic Forum data, if an area’s average income per capita is over 9000 US dollars, then knowledge and technological innovation will be the most important forces driving its economic growth. In Taiwan 98% of the companies are small and medium enterprises (SMEs), and they play a fundamental role in the sustainable development of Taiwan’s economy, but due to limited funding, very few of them have established research and development (R&D) departments. Over 70% of the R & D resources in Taiwan are held by universities, which have become hubs for new knowledge and technologies. Through university-industry collaboration, original and breakthrough ideas, inventions, and innovations are systematically channeled from universities into industrial applications and used to develop an entrepreneurial economy. This method has been proven effective in many developing countries. This paper examines how the government policy helps university incubators enhance R & D ability and subsequently promote production efficiency and product quality.
Demonstration of the Interaction between Two Stopped Light Pulses
Yi-Hsin Chen,Meng-Jung Lee,Weilun Hung,Ying-Cheng Chen,Yong-Fan Chen,Ite A. Yu
Physics , 2011, DOI: 10.1103/PhysRevLett.108.173603
Abstract: We report the first experimental demonstration that two light pulses were made motionless and interacted with each other via a medium. The interaction time is, in principle, as long as possible and a considerable efficiency can be achieved even below single-photon level. We utilized the optical process of one photon pulse switched by another based on the effect of electromagnetically induced transparency to demonstrate the enhancement of optical nonlinear efficiency. With moving light pulses, the switching is activated at energy per area of 2 photons per atomic absorption cross section in the best situation as discussed in [Phys. Rev. Lett. 82, 4611 (1999)]. With motionless light pulses, we demonstrated that the switching is activated at 0.56 photons per atomic absorption cross section and that the light level can be further reduced by increasing the optical density of the medium. Our work enters a new regime of low light physics.
Cusp-scaling behavior in fractal dimension of chaotic scattering
Adilson E. Motter,Ying-Cheng Lai
Physics , 2002, DOI: 10.1103/PhysRevE.65.065201
Abstract: A topological bifurcation in chaotic scattering is characterized by a sudden change in the topology of the infinite set of unstable periodic orbits embedded in the underlying chaotic invariant set. We uncover a scaling law for the fractal dimension of the chaotic set for such a bifurcation. Our analysis and numerical computations in both two- and three-degrees-of-freedom systems suggest a striking feature associated with these subtle bifurcations: the dimension typically exhibits a sharp, cusplike local minimum at the bifurcation.
Cascade-based attacks on complex networks
Adilson E. Motter,Ying-Cheng Lai
Physics , 2003, DOI: 10.1103/PhysRevE.66.065102
Abstract: We live in a modern world supported by large, complex networks. Examples range from financial markets to communication and transportation systems. In many realistic situations the flow of physical quantities in the network, as characterized by the loads on nodes, is important. We show that for such networks where loads can redistribute among the nodes, intentional attacks can lead to a cascade of overload failures, which can in turn cause the entire or a substantial part of the network to collapse. This is relevant for real-world networks that possess a highly heterogeneous distribution of loads, such as the Internet and power grids. We demonstrate that the heterogeneity of these networks makes them particularly vulnerable to attacks in that a large-scale cascade may be triggered by disabling a single key node. This brings obvious concerns on the security of such systems.
Efficient algorithm for detecting unstable periodic orbits in chaotic systems
Ruslan L. Davidchack,Ying-Cheng Lai
Physics , 1999, DOI: 10.1103/PhysRevE.60.6172
Abstract: We present an efficient method for fast, complete, and accurate detection of unstable periodic orbits in chaotic systems. Our method consists of a new iterative scheme and an effective technique for selecting initial points. The iterative scheme is based on the semi-implicit Euler method, which has both fast and global convergence, and only a small number of initial points is sufficient to detect all unstable periodic orbits of a given period. The power of our method is illustrated by numerical examples of both two- and four-dimensional maps.
Blowout bifurcation of chaotic saddles
Tomasz Kapitaniak,Ying-Cheng Lai,Celso Grebogi
Discrete Dynamics in Nature and Society , 1998, DOI: 10.1155/s1026022699000023
Abstract: Chaotic saddles are nonattracting dynamical invariant sets that can lead to a variety of physical phenomena. We describe the blowout bifurcation of chaotic saddles located in the symmetric invariant manifold of coupled systems and discuss dynamical phenomena associated with this bifurcation.
Range-based attack on links in scale-free networks: are long-range links responsible for the small-world phenomenon?
Adilson E. Motter,Takashi Nishikawa,Ying-Cheng Lai
Physics , 2002, DOI: 10.1103/PhysRevE.66.065103
Abstract: The small-world phenomenon in complex networks has been identified as being due to the presence of long-range links, i.e., links connecting nodes that would otherwise be separated by a long node-to-node distance. We find, surprisingly, that many scale-free networks are more sensitive to attacks on short-range than on long-range links. This result, besides its importance concerning network efficiency and/or security, has the striking implication that the small-world property of scale-free networks is mainly due to short-range links.
Large-scale structural organization of social networks
Adilson E. Motter,Takashi Nishikawa,Ying-Cheng Lai
Physics , 2003, DOI: 10.1103/PhysRevE.68.036105
Abstract: The characterization of large-scale structural organization of social networks is an important interdisciplinary problem. We show, by using scaling analysis and numerical computation, that the following factors are relevant for models of social networks: the correlation between friendship ties among people and the position of their social groups, as well as the correlation between the positions of different social groups to which a person belongs.
Reactive dynamics of inertial particles in nonhyperbolic chaotic flows
Adilson E. Motter,Ying-Cheng Lai,Celso Grebogi
Physics , 2003, DOI: 10.1103/PhysRevE.68.056307
Abstract: Anomalous kinetics of infective (e.g., autocatalytic) reactions in open, nonhyperbolic chaotic flows are important for many applications in biological, chemical, and environmental sciences. We present a scaling theory for the singular enhancement of the production caused by the universal, underlying fractal patterns. The key dynamical invariant quantities are the effective fractal dimension and effective escape rate, which are primarily determined by the hyperbolic components of the underlying dynamical invariant sets. The theory is general as it includes all previously studied hyperbolic reactive dynamics as a special case. We introduce a class of dissipative embedding maps for numerical verification.
Transition to turbulence in ferrofluids
Sebastian Altmeyer,Younghae Do,Ying-Cheng Lai
Physics , 2015,
Abstract: It is known that in classical fluids turbulence typically occurs at high Reynolds numbers. But can turbulence occur at low Reynolds numbers? Here we investigate the transition to turbulence in the classic Taylor-Couette system in which the rotating fluids are manufactured ferrofluids with magnetized nanoparticles embedded in liquid carriers. We find that, in the presence of a magnetic field turbulence can occur at Reynolds numbers that are at least one order of magnitude smaller than those in conventional fluids. This is established by extensive computational ferrohydrodynamics through a detailed bifurcation analysis and characterization of behaviors of physical quantities such as the energy, the wave number, and the angular momentum through the bifurcations. A striking finding is that, as the magnetic field is increased, the onset of turbulence can be determined accurately and reliably. Our results imply that experimental investigation of turbulence can be greatly facilitated by using ferrofluids, opening up a new avenue to probe into the fundamentals of turbulence and the challenging problem of turbulence control.
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