Browsing by Issue Date, starting with "2016-05-05"

Now showing 1 - 20 of 17337

Efficiently sphere-decodable physical layer transmission schemes for wireless storage networks
(2016-05-05)
Lu, Hsiao-feng (Francis)
;
Barreal, Amaro
;
Karpuk, David
;
Hollanti, Camilla
;
資訊工程學系
Three transmission schemes over a new type of multiple-access channel (MAC) model with inter-source communication links are proposed and investigated in this paper. This new channel model is well motivated by, e.g., wireless distributed storage networks, where communication to repair a lost node takes place from helper nodes to a repairing node over a wireless channel. Since in many wireless networks nodes can come and go in an arbitrary manner, there must be an inherent capability of inter-node communication between every pair of nodes. Assuming that communication is possible between every pair of helper nodes, the newly proposed schemes are based on various smart time-sharing and relaying strategies. In other words, certain helper nodes will be regarded as relays, thereby converting the conventional uncooperative multiple-access channel to a multiple-access relay channel (MARC). The diversity-multiplexing gain tradeoff (DMT) of the system together with efficient sphere-decodability and low structural complexity in terms of the number of antennas required at each end is used as the main design objectives. While the optimal DMT for the new channel model is fully open, it is shown that the proposed schemes outperform the DMT of the simple time-sharing protocol and, in some cases, even the optimal uncooperative MAC DMT. While using a wireless distributed storage network as a motivating example throughout the paper, the MAC transmission techniques proposed here are completely general and as such applicable to any MAC communication with inter-source communication links.
Efficiently sphere-decodable physical layer transmission schemes for wireless storage networks
(2016-05-05)
Lu, Hsiao-feng (Francis)
;
Barreal, Amaro
;
Karpuk, David
;
Hollanti, Camilla
;
電機工程學系
Three transmission schemes over a new type of multiple-access channel (MAC) model with inter-source communication links are proposed and investigated in this paper. This new channel model is well motivated by, e.g., wireless distributed storage networks, where communication to repair a lost node takes place from helper nodes to a repairing node over a wireless channel. Since in many wireless networks nodes can come and go in an arbitrary manner, there must be an inherent capability of inter-node communication between every pair of nodes. Assuming that communication is possible between every pair of helper nodes, the newly proposed schemes are based on various smart time-sharing and relaying strategies. In other words, certain helper nodes will be regarded as relays, thereby converting the conventional uncooperative multiple-access channel to a multiple-access relay channel (MARC). The diversity-multiplexing gain tradeoff (DMT) of the system together with efficient sphere-decodability and low structural complexity in terms of the number of antennas required at each end is used as the main design objectives. While the optimal DMT for the new channel model is fully open, it is shown that the proposed schemes outperform the DMT of the simple time-sharing protocol and, in some cases, even the optimal uncooperative MAC DMT. While using a wireless distributed storage network as a motivating example throughout the paper, the MAC transmission techniques proposed here are completely general and as such applicable to any MAC communication with inter-source communication links.
Quantum criticality of the two-channel pseudogap Anderson model: universal scaling in linear and non-linear conductance
(2016-05-05)
Wu, Tsan-Pei
;
Wang, Xiao-Qun
;
Guo, Guang-Yu
;
Anders, Frithjof
;
Chung, Chung-Hou
The quantum criticality of the two-lead two-channel pseudogap Anderson impurity model is studied. Based on the non-crossing approximation (NCA) and numerical renormalization group (NRG) approaches, we calculate both the linear and nonlinear conductance of the model at finite temperatures with a voltage bias and a power-law vanishing conduction electron density of states, rho(c)(omega) alpha | omega-mu(F)|(r) (0 < r < 1) near the Fermi energy mu(F). At a fixed leadimpurity hybridization, a quantum phase transition from the two-channel Kondo (2CK) to the local moment (LM) phase is observed with increasing r from r = 0 to r = r(c) < 1. Surprisingly, in the 2CK phase, different power-law scalings from the well-known root T or root V form is found. Moreover, novel power-law scalings in conductances at the 2CK-LM quantum critical point are identified. Clear distinctions are found on the critical exponents between linear and non-linear conductance at criticality. The implications of these two distinct quantum critical properties for the non-equilibrium quantum criticality in general are discussed.
交大e-News第208期-以植物盆栽促進人類溝通頻率交大團隊奪高齡設計賽全球第三
(2016-05-05)
國立交通大學秘書室
;
Secretariat
Drag force of Anisotropic plasma at finite U(1) chemical potential
(2016-05-05)
Cheng, Long
;
Ge, Xian-Hui
;
Wu, Shang-Yu
;
電子物理學系
;
Department of Electrophysics
We perform the calculation of the drag force acting on amassive quark moving through an anisotropic N = 4 SU(N) Super Yang-Mills plasma in the presence of a U(1) chemical potential. We present the numerical results for any value of the anisotropy and arbitrary direction of the quark velocity with respect to the direction of the anisotropy. We find the effect of the chemical potential or charge density will enhance the drag force for our charged solution.
Economic dispatch of chiller plant by improved ripple bee swarm optimization algorithm for saving energy
(2016-05-05)
Lo, Chi-Chun
;
Tsai, Shang-Ho
;
Lin, Bor-Shyh
;
影像與生醫光電研究所
;
電控工程研究所
This paper presents an improved ripple bee swarm optimization (IRBSO) algorithm to solve the problem of the economic dispatch of chiller plants (EDCP). Using the characteristics of biological communities, different movement models are adopted to search within the feasible solution space. This paper uses nonlinear ripple weight factors and self-adaption repulsion factor to improve the BSO and proposes the influence of parameters on the IRBSO method to more effectively search the feasible space. For all bee swarms, the efficiency of searching movement in the solution space improves, and the capacity of information discovery and mining increases. This paper utilizes the test cases to verify the proposed IRBSO, including EDCP problems for a single day and a single week. Compared with other methods, the results of the proposed IRBSO exhibit higher accuracy and stability, making it suitable for the operation planning of multiple chiller systems. (C) 2016 Elsevier Ltd. All rights reserved.
Remarks on the weak formulation of the Navier-Stokes equations on the 2D hyperbolic space
(2016-05-06)
Chan, Chi Hin
;
Czubak, Magdalena
;
應用數學系
;
Department of Applied Mathematics
The Leray-Hopf solutions to the Navier Stokes equation are known to be unique on R-2. In our previous work, we showed the breakdown of uniqueness in a hyperbolic setting. In this article, we show how to formulate the problem in order so the uniqueness can be restored. (C) 2015 Elsevier Masson SAS. All rights reserved.
Functional Connectivity During Phonemic and Semantic Verbal Fluency Test: A Multichannel Near Infrared Spectroscopy Study
(2016-05-06)
Huang, Chun-Jung
;
Chou, Po-Han
;
Wei, Hao-Lin
;
Sun, Chia-Wei
;
光電工程學系
Verbal fluency tests (VFTs) are widely used frontal lobe neuropsychological tests. They have been frequently used in various functional brain mapping studies. There are two versions of VFTs based on the type of cue: the letter fluency task (LFT) and the category fluency task (CFT). However, the fundamental aspects of brain connectivity across the frontotemporal regions during the VFTs have not been elucidated. In this study, we hypothesized that differences in cortical functional connectivity over the left and right frontotemporal regions may be observed by means of multi-channel functional near-infrared spectroscopy (fNIRS) during the performance of LFT and CFT. Our results from fNIRS (ETG-4000) showed different patterns of brain functional connectivity during the two types of VFTs, which was consistent with the different cognitive requirements of each task. We demonstrate increased brain functional connectivity over the frontal and temporal regions during the LFT than during the CFT; these results are in line with previous brain activity studies using fNIRS to demonstrate higher frontal and temporal region activation during LFT and CFT, with more pronounced frontal activation by the LFT.
傢俱魔法師　理念付諸設計
(2016-05-08)
修瑞韓
;
Department of Communication and Technology
;
傳播與科技學系
傢俱與道具佈置設計師李承峰堅持自我信念，賦予老舊傢俱新的生命及意義。
先知瑪莉　雨季的聲音
(2016-05-08)
趙廣絜
;
Department of Communication and Technology
;
傳播與科技學系
以鏡頭紀錄先知瑪莉《梅雨季》巡迴臺北場。
藝術呈現與突破　蜷川實花
(2016-05-08)
蕭泳
;
Department of Communication and Technology
;
傳播與科技學系
簡介蜷川實花的台北首展。
獸迷文化之介紹
(2016-05-08)
王鈞鋒
;
Department of Communication and Technology
;
傳播與科技學系
以資訊圖表簡單介紹獸迷文化與理念。
斜坡上的歌手　達卡鬧
(2016-05-08)
林湘芸
;
Department of Communication and Technology
;
傳播與科技學系
原住民歌手達卡鬧，用音樂記錄原住民的一切。
沉默的王牌　王建民
(2016-05-08)
李宗諺
;
Department of Communication and Technology
;
傳播與科技學系
王建民歷經成功、受傷、失意，一直以來默默地努力，沉默的王牌始終如一。
放膽追夢　以愛經營
(2016-05-08)
翁世樺
;
Department of Communication and Technology
;
傳播與科技學系
吳佩君在南崁開了三間印尼小吃店，除了實踐自己的夢想外，她還希望帶給身邊的印尼朋友家鄉的溫暖。
廉價航空VS傳統航空
(2016-05-08)
鄭宇茹
;
Department of Communication and Technology
;
傳播與科技學系
比較廉價航空與傳統航空的差異。
動漫社會學　從動漫談社會
(2016-05-08)
吳昀蒨
;
Department of Communication and Technology
;
傳播與科技學系
《動漫社會學：別說得好像還有救》是一本從社會學的理論與概念來討論動漫遊戲的文章合輯。
電影的另外一段歷史
(2016-05-08)
許凱智
;
Department of Communication and Technology
;
傳播與科技學系
電影播放技術越來越進步，而已被淘汰的器材，仍舊象徵著當時電影獨有的記憶。
農倉強拆　喚醒公民意識
(2016-05-08)
唐宜嘉
;
Department of Communication and Technology
;
傳播與科技學系
二〇一六年四月十七日，彰化農業倉庫被無預警拆除。搶救百年彰化農業倉庫聯盟舉辦系列活動，期待喚醒鄉土意識與公民參與。
動態圖像　用短片說故事
(2016-05-08)
林謙耘
;
Department of Communication and Technology
;
傳播與科技學系
動態圖像又被稱為會動的平面圖像，是能在相當短的時間內，傳達許多資訊的短片。