Browsing by Issue Date, starting with "2008-04-24"

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Fast retransmit and fast recovery schemes of transport protocols: A survey and taxonomy
(2008-04-24)
Ho, Cheng-Yuan
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Chen, Yaw-Chung
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Chan, Yi-Cheng
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Ho, Cheng-Yun
;
資訊工程學系
Although there are two standard transport protocols, TCP and UDP, offering services in the Internet, the majority of the traffic over the Internet is TCP-based. TCP-based applications can react to packet losses; however, many performance problems have been recently observed in the Internet. To resolve these problems, several new TCP fast retransmit and fast recovery algorithms have been proposed. This article surveys state-of-the-art fast retransmit and fast recovery mechanisms of TCP to address the lost packet problem, and presents a description of some useful algorithms, design issues, advantages, and disadvantages. The objective of this article is fourfold: to provide an introduction to TCP protocol; to discuss problems degrading TCP retransmission performance in the present-day Internet; to describe some proposed transport protocols that solve a number of throughput issues; and finally, to gain new insight into these protocols and thereby suggest avenues for future research. Based on our taxonomy, existing fast retransmit and fast recovery schemes of transport protocols are described in this survey. (C) 2008 Elsevier B.V. All rights reserved.
Iris recognition method
(2008-04-24)
Hwang, Wen-Liang
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Lin, Jian-Liang
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Huang, Chung-Lin
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Che, Wei-Gang
The present invention disclose an iris recognition method, which utilizes a matching pursuit algorithm to simplify the extraction and reconstruction of iris features and reduce the memory space required by each iris feature vector without the penalty of recognition accuracy. The iris recognition method of the present invention comprises an iris-localization component and a pattern matching component. The iris-localization component locates the iris region via the color difference between different portions of the eyeball. The primary iris features are extracted from iris information and transformed into a sequence of iris feature vectors by a matching pursuit algorithm. Thus, the iris image can be represented by a sequence of atoms, and each atom contains base, amplitude and location. Then, the comparison between the feature vectors of two irises is performed to determine whether the two irises match.
SCPS: A self-configuring power-saving protocol for wireless ad hoc networks
(2008-04-24)
Huang, Shih-Chang
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Jan, Rong-Hong
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Yang, Wuu
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資訊工程學系
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Department of Computer Science
SCPS is a novel self-configuring power-saving protocol for wireless one-hop ad hoc networks. According to IEEE 802.11 WLAN standard, a station may enter a special power-saving (PS) mode. SCPS allows all stations in the PS mode to adjust their wakeup schedules whenever a station enters or exits the PS mode. The adjustment can balance the number of wakeup, stations in each beacon interval so that the contention for transmission medium and the collisions in transmission will be ameliorated, which results in more efficient energy usage. Simulation results show that SCPS successfully balances the number of stations that wake up in each beacon interval, increases the sleep ratio, and reduces the collision probability. The combined effect reduces total energy consumption. (C) 2008 Elsevier B.V. All rights reserved.
5 GHz quadrature voltage-controlled oscillator using trifilar transformers
(2008-04-24)
Syu, J. -S.
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Meng, C.
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Tsung, K. -C.
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Huang, G. -W.
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電信工程研究所
A 0.18 mm CMOS 5 GHz quadrature voltage-controlled oscillator (QVCO) is demonstrated by using trifilar transformer coupling. The trifilar transformers composed of one primary coil and two secondary coils are used to separate the gate and drain bias for output voltage swing optimisation and also replace a conventional transistor-coupling method for quadrature output generation simultaneously. As a result, the trifilar-coupling QVCO achieves 180.1 dBc/Hz figure of merit (FOM) at the supply voltage of 1.2 V. The on-chip passive single sideband upconversion mixer is also demonstrated to fairly measure the quadrature accuracy of the QVCO. Thus, a 33.7 dB sideband rejection ratio is achieved.
Sub-single-cycle optical pulse train with constant carrier envelope phase
(2008-04-25)
Chen, Wei-Jan
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Hsieh, Zhi-Ming
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Huang, ShuWei
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Su, Hao-Yu
;
Lai, Chien-Jen
We describe the synthesis of periodic waveforms consisting of a train of pulses that are 0.83 cycles long and have an electric field pulse width of 0.44 fs using 7 Raman sidebands generated by molecular modulation in H(2). We verify by optical correlation that the carrier-envelope phase is constant in these waveforms when they are synthesized from commensurate sidebands. The estimated overall shift of the carrier-envelope phase is less than 0.18 cycles from the first to the last pulse of nearly 10(6) pulses in the pulse train.
希伯崙社會邊緣人之家
(2008-04-27)
張雅雯
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Department of Communication and Technology
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傳播與科技學系
每天晚上打開電視新聞，家暴、吸毒、跳樓或是燒炭自殺等負面新聞層出不窮，有些人因為原生家庭的破碎，導致行為偏差；有些人則是因為社會經濟的壓力，而走上絕路。這些社會邊緣人因為各種不同的原因和背景，無法在社會正常生存，因而需要一個地方來接納、包容他們，而位於桃園楊梅的「希伯崙」就是一個能提供庇護的「家」。
黃國倫返母校用歌聲鼓勵交大人
(2008-04-27)
謝佳慧
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Department of Communication and Technology
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傳播與科技學系
黃國倫交大演講
「食」在不方便交大學生健康堪慮
(2008-04-27)
林暐家
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Department of Communication and Technology
;
傳播與科技學系
堪慮阿堪慮
第二十期總編輯的話
(2008-04-27)
李怡萱
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Department of Communication and Technology
;
傳播與科技學系
第二十期總編輯的話
都市新夜景新竹城市光廊
(2008-04-27)
楊宇軒
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Department of Communication and Technology
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傳播與科技學系
帶您來看看夜晚的新竹
Pain of Salvation─與眾不同的前衛
(2008-04-27)
蔡昇峰
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Department of Communication and Technology
;
傳播與科技學系
Pain of Salvation，一個來自瑞典的前衛金屬搖滾樂團。自從首張專輯《Entropia》在1997年發行後，就在前衛金屬界造成轟動，用其獨樹一格的樂風，以及深度廣度兼備的感情與專輯概念，顛覆對前衛金屬的認知。
PTT言論助力還是暴力
(2008-04-27)
沈昭邦
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Department of Communication and Technology
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傳播與科技學系
藉由這次燒狗事件看PTT鄉民的群眾力量以及群眾暴力
以物易物潮流清交也瘋狂
(2008-04-27)
黃夙蓮
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Department of Communication and Technology
;
傳播與科技學系
環保以物易物欲換團
為骷髏脊椎填色—Frida Kahlo
(2008-04-27)
鄭瑋津
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Department of Communication and Technology
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傳播與科技學系
Frida是一聞名世界的墨西哥女畫家，親自探訪她的故鄉和過去後，認為是頗值得一去的地方。
《東京鐵搭》最動人的親情
(2008-04-27)
陳惠玟
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Department of Communication and Technology
;
傳播與科技學系
書評─東京鐵搭
2008年財經科技論壇曹興誠談國際趨勢
(2008-04-27)
姜建亨
;
Department of Communication and Technology
;
傳播與科技學系
交大舉辦了2008年財經科技論壇曹興誠談國際趨勢分享科技產業趨勢以新聞帶角度完成這支影片
用客語寫歌─羅紹麒
(2008-04-27)
陳貞儒
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Department of Communication and Technology
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傳播與科技學系
羅紹麒
SBL王者爭霸戰裕隆吞敗
(2008-04-27)
汪承漢
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Department of Communication and Technology
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傳播與科技學系
王者裕隆的下一步？
2008年財經科技論壇曹興誠談國際趨勢
(2008-04-27)
姜建亨
;
Department of Communication and Technology
;
傳播與科技學系
由2008財經科技論壇記者會以及演講內容與專訪曹興誠的電視新聞帶
狗肉合法化人類文明大後退
(2008-04-27)
鍾瑄
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Department of Communication and Technology
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傳播與科技學系
媽呀