Entity-relationship modeling re-revisited

Paper presented at the 23rd International Conference on Conceptual Modeling (ER 2004), Shanghai, China, November 2004. Lecture Notes in Computer Science 3288, pp. 43-52 (http://springerlink.metapress.com/link.asp?id=xt88y6nmtyabjdlv). Retrieved 6/26/2006 from http://www.cis.drexel.edu/faculty/song/publications/p_ER_Revisited_ER2004-Final.pdf.Since its introduction, the Entity-Relationship (ER) model has been the vehicle of choice in communicating the structure of a database schema in an implementation-independent fashion. Part of its popularity has no doubt been due to the clarity and simplicity of the associated pictorial Entity-Relationship Diagrams (“ERD’s”) and to the dependable mapping it affords to a relational database schema. Although the model has been extended in different ways over the years, its basic properties have been remarkably stable. Even though the ER model has been seen as pretty well “settled,” some recent papers, notably [4] and [2 (from whose paper our title is derived)], have enumerated what their authors consider serious shortcomings of the ER model. They illustrate these by some interesting examples. We believe, however, that those examples are themselves flawed. In fact, while not claiming that the ER model is perfect, we do believe that the overhauls hinted at are probably not necessary and possibly counterproductive

Entrepreneurship, Innovation and Economic Growth:The Case of Yangtze River Delta in China

This paper firstly discusses why the economic growth in the Yangtze River Delta has been slowed down recently and suggests a need totransform the current input-based economic growth pattern into aninnovation-based one. Next, through our theoretical analysis, we find that the change of current economic growth pattern is just the innovative reallocationof production factors, and the new economic growth driven by innovation is mainly initiated by the transmutation of entrepreneurship. Finally, we test our belief with real-world evidence. It shows that the Delta has formed a mechanism in which entrepreneurship and human capital mutually promote each other. However, the interactive relationship between R&D expenditure and entrepreneurship has not been developed in general. In addition, excessive government interventions will do harm to the growth of entrepreneurs and economic development.entrepreneurship, innovation and economic growth pattern

Efficient Algorithms and Error Analysis for the Modified Nystrom Method

Many kernel methods suffer from high time and space complexities and are thus prohibitive in big-data applications. To tackle the computational challenge, the Nystr\"om method has been extensively used to reduce time and space complexities by sacrificing some accuracy. The Nystr\"om method speedups computation by constructing an approximation of the kernel matrix using only a few columns of the matrix. Recently, a variant of the Nystr\"om method called the modified Nystr\"om method has demonstrated significant improvement over the standard Nystr\"om method in approximation accuracy, both theoretically and empirically. In this paper, we propose two algorithms that make the modified Nystr\"om method practical. First, we devise a simple column selection algorithm with a provable error bound. Our algorithm is more efficient and easier to implement than and nearly as accurate as the state-of-the-art algorithm. Second, with the selected columns at hand, we propose an algorithm that computes the approximation in lower time complexity than the approach in the previous work. Furthermore, we prove that the modified Nystr\"om method is exact under certain conditions, and we establish a lower error bound for the modified Nystr\"om method.Comment: 9-page paper plus appendix. In Proceedings of the 17th International Conference on Artificial Intelligence and Statistics (AISTATS) 2014, Reykjavik, Iceland. JMLR: W&CP volume 3

State-of-the-Art of High Power Gyro-Devices and Free Electron Masers. Update 2016 (KIT Scientific Reports ; 7735)

This report reviews the current experimental state-of-the-art of megawatt-class gyrotrons for fusion plasma heating. In addition, it summarizes the status of frequency-tunable gyrotrons, multi-megawatt gyrotrons with coaxial resonator, gyrotrons for technological and spectroscopic applications, relativistic gyrotrons, cyclotron-autoresonance-masers, gyroklystrons, gyro-TWT-and gyrotwystron-amplifiers, gyro-BWOs, gyro-harmonic-convertors gyro-peniotrons, magnicons, and free-electron-masers

Passively harmonic mode-locking in an Erbium-doped fiber laser based on carbon nanotubes film at repetition rates to 500MHz

Passively harmonic mode-locking (HML) of an Erbium-doped fiber laser using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film is presented. The 20th harmonic mode-locking pulses at 500MHz repetition rate with 42dB super-mode suppression ratio (SMSR) are achieved

Dealloyed porous gold anchored by: In situ generated graphene sheets as high activity catalyst for methanol electro-oxidation reaction

A novel one-step method to prepare the nanocomposites of reduced graphene oxide (RGO)/nanoporous gold (NPG) is realized by chemically dealloying an Al2Au precursor. The RGO nanosheets anchored on the surface of NPG have a cicada wing like shape and act as both conductive agent and buffer layer to improve the catalytic ability of NPG for methanol electro-oxidation reaction (MOR). This improvement can also be ascribed to the microstructure change of NPG in dealloying with RGO. This work inspires a facile and economic method to prepare the NPG based catalyst for MOR