7,280 research outputs found
Surface Polaron Formation in the Holstein model
The effect of a solid-vacuum interface on the properties of a strongly
coupled electron-phonon system is analyzed using dynamical mean-field theory to
solve the Holstein model in a semi-infinite cubic lattice. Polaron formation is
found to occur more easily (i.e., for a weaker electron-phonon coupling) on the
surface than in the bulk. On the other hand, the metal-insulator transition
associated to the binding of polarons takes place at a unique critical strength
in the bulk and at the surface.Comment: 5 pages, 3 figure
Design of Finite-Length Irregular Protograph Codes with Low Error Floors over the Binary-Input AWGN Channel Using Cyclic Liftings
We propose a technique to design finite-length irregular low-density
parity-check (LDPC) codes over the binary-input additive white Gaussian noise
(AWGN) channel with good performance in both the waterfall and the error floor
region. The design process starts from a protograph which embodies a desirable
degree distribution. This protograph is then lifted cyclically to a certain
block length of interest. The lift is designed carefully to satisfy a certain
approximate cycle extrinsic message degree (ACE) spectrum. The target ACE
spectrum is one with extremal properties, implying a good error floor
performance for the designed code. The proposed construction results in
quasi-cyclic codes which are attractive in practice due to simple encoder and
decoder implementation. Simulation results are provided to demonstrate the
effectiveness of the proposed construction in comparison with similar existing
constructions.Comment: Submitted to IEEE Trans. Communication
Lowering the Error Floor of LDPC Codes Using Cyclic Liftings
Cyclic liftings are proposed to lower the error floor of low-density
parity-check (LDPC) codes. The liftings are designed to eliminate dominant
trapping sets of the base code by removing the short cycles which form the
trapping sets. We derive a necessary and sufficient condition for the cyclic
permutations assigned to the edges of a cycle of length in the
base graph such that the inverse image of in the lifted graph consists of
only cycles of length strictly larger than . The proposed method is
universal in the sense that it can be applied to any LDPC code over any channel
and for any iterative decoding algorithm. It also preserves important
properties of the base code such as degree distributions, encoder and decoder
structure, and in some cases, the code rate. The proposed method is applied to
both structured and random codes over the binary symmetric channel (BSC). The
error floor improves consistently by increasing the lifting degree, and the
results show significant improvements in the error floor compared to the base
code, a random code of the same degree distribution and block length, and a
random lifting of the same degree. Similar improvements are also observed when
the codes designed for the BSC are applied to the additive white Gaussian noise
(AWGN) channel
Exploring Successful International Human Resource Management: Past, Present, and Future Directions
Today, approximately 60,000 multinational enterprises (MNEs) employ more than 45 million people worldwide. This is about twice as many as in 1990, and this number is predicted to increase to 75 million people by 2010 (Schuler, 2003). This paper is dedicated to helping develop the understanding and competencies necessary for HR managers to succeed. Additionally, this paper aims to review the most important aspects of International Human Resource Management, (IHRM), such as the development of IHRM, IHRM vs. domestic HRM, successful localization, and talent management in IHRM. Finally this paper discusses issues that are likely to gain importance in the IHRM field in the near future.IHRM, HRM, Localization, Talent Management, IHRM Future
Literature Review of The Store Windows Display Influences on Consumers Attractiveness Through the Layout Design
Windows display is one of the important aspect in retail design in order to increase consumer product awareness. The store windows design had been varied especially with the creative visual merchandiser in managing a visual approach of store windows display. Flat type store windows display often used in Bandung Retail, and has characteristic of its own retail brand image to improve attractiveness. Layout design of a store windows display has an important role for the influence of consumer behavior especially in shopping attitudes. This research identify the effects of WAKAI and MANGO store windows display at Trans Studio Mall on consumer attractiveness through the implementation of layout design principles
Keywords Store Windows, Retail, Attractiveness, Layout design
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