Sub-channel Assignment, Power Allocation and User Scheduling for Non-Orthogonal Multiple Access Networks

In this paper, we study the resource allocation and user scheduling problem for a downlink nonorthogonal multiple access network where the base station allocates spectrum and power resources to a set of users. We aim to jointly optimize the sub-channel assignment and power allocation to maximize the weighted total sum-rate while taking into account user fairness. We formulate the sub-channel allocation problem as equivalent to a many-to-many two-sided user-subchannel matching game in which the set of users and sub-channels are considered as two sets of players pursuing their own interests. We then propose a matching algorithm which converges to a two-side exchange stable matching after a limited number of iterations. A joint solution is thus provided to solve the sub-channel assignment and power allocation problems iteratively. Simulation results show that the proposed algorithm greatly outperforms the orthogonal multiple access scheme and a previous non-orthogonal multiple access scheme.Comment: Accepted as a regular paper by IEEE Transactions on Wireless Communication

Chinese Folk Elements in Dunnan Liu’s Piano Concerto The Mountain Forest

The Mountain Forest is a piano concerto composed by Chinese-American composer Dunnan Liu in 1979. The Concerto was inspired by the folk elements of the Chinese Miao ethnic minority group, including the elements of one of their most famous folk tunes, the “Fly Tune,” as well as folk instruments, dance, and festivals. The purpose of this project is to address how the Miao minority folk materials influence this work. The project contains a brief historical background of the piano in China, a brief biography of the composer and historical background of the Concerto, as well as an introduction of the Chinese Miao ethnic minority elements in the work. Lastly, I will offer some performance suggestions for pianists related to the influence of the folk elements. My goal is to provide knowledge of the cultural background, and tasteful performance notes for the pianists who want to study or perform this work

V2X Meets NOMA: Non-Orthogonal Multiple Access for 5G Enabled Vehicular Networks

Benefited from the widely deployed infrastructure, the LTE network has recently been considered as a promising candidate to support the vehicle-to-everything (V2X) services. However, with a massive number of devices accessing the V2X network in the future, the conventional OFDM-based LTE network faces the congestion issues due to its low efficiency of orthogonal access, resulting in significant access delay and posing a great challenge especially to safety-critical applications. The non-orthogonal multiple access (NOMA) technique has been well recognized as an effective solution for the future 5G cellular networks to provide broadband communications and massive connectivity. In this article, we investigate the applicability of NOMA in supporting cellular V2X services to achieve low latency and high reliability. Starting with a basic V2X unicast system, a novel NOMA-based scheme is proposed to tackle the technical hurdles in designing high spectral efficient scheduling and resource allocation schemes in the ultra dense topology. We then extend it to a more general V2X broadcasting system. Other NOMA-based extended V2X applications and some open issues are also discussed.Comment: Accepted by IEEE Wireless Communications Magazin

Unsupervised Learning of Long-Term Motion Dynamics for Videos

We present an unsupervised representation learning approach that compactly encodes the motion dependencies in videos. Given a pair of images from a video clip, our framework learns to predict the long-term 3D motions. To reduce the complexity of the learning framework, we propose to describe the motion as a sequence of atomic 3D flows computed with RGB-D modality. We use a Recurrent Neural Network based Encoder-Decoder framework to predict these sequences of flows. We argue that in order for the decoder to reconstruct these sequences, the encoder must learn a robust video representation that captures long-term motion dependencies and spatial-temporal relations. We demonstrate the effectiveness of our learned temporal representations on activity classification across multiple modalities and datasets such as NTU RGB+D and MSR Daily Activity 3D. Our framework is generic to any input modality, i.e., RGB, Depth, and RGB-D videos.Comment: CVPR 201

Effect of Copper Vapor on Radiation Properties of C4F7N Gas Mixtures

C4F7N and its mixture with buffer gases are regarded as the most promising SF6-alternative gases in gas circuit breakers. The switching arc can severely ablate the electrodes, producing copper metal vapor that combine with the C4F7N gas mixture to chang radiation characteristics. This paper compares the net emission coefficient of C4F7N mixtures at various mixing ratios and assesses the effect of 20% copper vapor. It is found that adding copper vapor can greatly enhance radiation

Material Transfer Buildup on PVD Coated Work Rolls during Hot Rolling of an Al Alloy

This study examines material transfer and adhesion from Al-Mg alloy samples to various PVD coatings deposited on AISI M2 steel rolls during hot rolling. It explores to examine if these PVD coatings can aid in extending the work roll life by either mitigating against material transfer or aiding in the early development of the roll coatings. Scanning electron microscopy (SEM) and focus ion beam (FIB) microscopy were used to investigate material transfer and adhesion to the surfaces of the work rolls. Aluminum and magnesium transfers were observed on all work rolls\u27 surfaces from the 1st hot rolling pass. A two-way material transfer mechanism between the work roll and the rolled aluminum alloy surfaces was confirmed to determine the amount of material transfer on the work roll surfaces. The lubrication flow rate was reduced to examine the lubrication’s influence on the Al/Mg adhesion mitigation behavior of Cr and TiCN PVD coatings during hot rolling. The emulsion was identified as playing a significant role in the Al/Mg transfer and buildup of roll coatings on the work roll surfaces. Under both high and low lubrication conditions during hot rolling no damage was observed on the work roll surfaces which indicated that the PVD coatings were effective at extending the work roll life, although they were not able to totally mitigate against Al/Mg transfer and buildup on the work roll surfaces

Stock market reactions to changes in the FTSE SmallCap and S&P/TSX SmallCap indices

Stocks added to (deleted from) the Russell 2000 and the S&P 600 indexes experience positive (negative) abnormal returns following the announcement. However, researchers disagree on whether these abnormal returns are permanent or temporary and offer competing explanations. I address this controversy by examining market reactions for firms that are added to or deleted from the FTSE Small Cap index (the main testing sample) and the S&P/TSX SmallCap index (the comparison sample). For the main testing sample, all stocks except pure additions, experience a permanent price change that is accompanied by a permanent change in liquidity. However, for the comparison sample, abnormal returns over the announcement period fully reverted within 30 days. In further examination of stock liquidity for the main testing sample, sample stocks experience permanent change in liquidity. Taken together, the observed results support the price pressure and liquidity hypotheses

Shareholder Wealth Effect and Payment Method in Domestic M&As Transactions: Evidence from the US and Asia Emerging Market

This paper employs the empirical methodology to investigate the impacts of M&As on shareholder wealth and the relationship between firm value and payment choice. Furthermore, it also intends to recognize some important determinants of payment choice. Most of theories have only been examined in developed economies. However, the studies in developing countries are still insufficient. That is due to the reason that comprehensive database and the number of transactions is shortage in developing countries. Therefore, it begs the question of whether the evidence found in a developed country is equally suitable for the emerging market. In general, the empirical results are in accordance with the previous study. For instance, the shareholder will obtain negative or around zero return from M&As in the US market, while the merger deal would create a significant positive return for acquiring shareholders in Asia emerging market. In addition, the cash offer can generate higher abnormal return compared with stock offer in both markets. However, different with most of the studies, the conclusion in the Asia market suggests that stock-financed acquisition will also generate positive returns which may be due to the centralized shareholder structure. Because of the different characteristics in these two markets, the investigation illustrates that the determinants which are significant in the US market lose their explanatory power in the Asia emerging market