Browsing by Issue Date, starting with "2011-12-19"

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Room temperature lasing with high group index in metal-coated GaN nanoring
(2011-12-19)
Wang, Yow-Gwo
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Chang, Shu-Wei
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Chen, Cheng-Chang
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Chiu, Ching-Hsueh
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Kuo, Ming-Yen
The room temperature lasing action from a metal-coated GaN nanoring cavity was observed by optical pumping. The GaN nanoring is 7 mu m in diameter and 400 nm in width. The quality factor of the cavity is approximately 860 with a threshold power density of 37.5 mJ/cm(2). Such a device performance was attributed to the combination of metal-coated nanocavity with whispering-gallery modes. Moreover, the group index extracted from the experiment was 5.99 and was verified with calculations and analyses of the lasing modes as well as their characteristics. The study showed a promising way to further improve the performance of metal-coated nanolasers. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3671648]
Radio frequency identification (RFID) with mobile-grid based framework for farmland irrigation facility management
(2011-12-19)
Wu, Teng-yen
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Yeh, Kun-chieh
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Chen, Ruey-shun
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Chen, C. C.
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Chen, Y. C.
The farmland irrigation system is the lifeblood for the agriculture; due to the fact that the farmland irrigation facilities in Taiwan cover a wide range of area, the traditional Web-based system cannot appropriately meet the dynamic service requirements in the field, and their resource services could not be fully shared and reused. Therefore, in response to the distributed environmental requirements of the farmland irrigation facilities, the mobile grid will combine the grid resource framework and the mobile service mechanism: the grid resource sharing mode addresses the bottleneck in the use of the distributed information; through the use of the radio frequency identification (RFID) technology as the information trigger component of the gird nodes, the on-site patrol performance of the irrigation facilities is improved; and the combination of the global positioning system (GPS) and geographic information system (GIS) systems to build the grid application presentation interface facilitates the monitor of the irrigation facilities and patrol status. With the help of the integrated service platform of the mobile grid, the wide-area distributed nodes can be optimally controlled and used.
Using adaptive four-band OFDM modulation with 40 Gb/s downstream and 10 Gb/s upstream signals for next generation long-reach PON
(2011-12-19)
Yeh, C. H.
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Chow, C. W.
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Chen, H. Y.
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Chen, B. W.
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光電工程學系
In this demonstration, we propose and demonstrate an adaptive long-reach passive optical network (LR-PON) using four-band orthogonal frequency division multiplexed (OFDM) channels. The downstream traffic rates from 6.25 to 40 Gb/s (using fixed quadrature amplitude modulation (QAM) level in the four OFDM bands) and from 9.37 to 40.3 Gb/s (using variable QAM levels in the four OFDM bands) can be achieved adaptively in the optical network units (ONUs) depending on different fiber transmission lengths from 0 to 100 km. For the upstream transmission, a 10 Gb/s 16-QAM OFDM signal with pre-emphasis is experimentally performed by using a 2.5 GHz directly modulated laser (DML). Based on the simulation and experimental results, the proposed adaptive four-band OFDM system could be a promising candidate for the future LR-PON. (C)2011 Optical Society of America
交大e-News第108期
(2011-12-20)
Secretariat
;
國立交通大學秘書室
全像資訊記錄與讀取裝置
(2011-12-21)
謝美莉
;
林烜輝
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王瑞鑫
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許根玉
;
蔣東堯
一種全像資訊記錄與讀取裝置，係利用光纖引導記錄所需之參考光，並搭配旋轉裝置使參考光可以不同角度入射至記錄介質，與攜帶資料之信號光相交干涉後，由全像記錄介質將資訊儲存下來；讀取資料時，再以相同裝置導引讀取光，以記錄時參考光所用的角度入射於全像記錄介質中，即可讀取原儲存資料。由於此發明利用光纖導引參考與讀取光，因此在參考與讀取光路徑上無光學元件阻攔，此舉可簡化參考與讀取光之光路系統；同時，利用光纖導引光線可以大幅度改善此裝置所能改變之角度範圍，並且可整合穿透式、反射式與90度的三種不同形式之全像儲存技術，可為全像材料之測試平台。
在網路流量中分類所屬應用程式之方法
(2011-12-21)
林盈達
;
彭偉豪
;
賴源正
;
呂俊男
;
陳一瑋
本發明提出了一種網路流量分類方法，其利用網路傳輸層行為特徵以及應用程式連線封包大小分佈與結合埠關聯特性，做為辨認流量中所屬應用程式之依據。利用應用程式在傳輸層中行為計算出的向量值與已知的代表特徵點比對辨認，並且利用埠關聯的特性一併將與應用程式相關的連線辨識出來。
從牟斯的《禮物》談當代社會的禮物
(2011-12-21)
何翠萍
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開放教育推動中心
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Open Education Office
課程首頁本課程是由交通大學新文藝復興閱讀計畫提供。 96 年 8 月當各大學紛紛摩拳擦掌準備迎接新生的同時，交通大學校長吳重雨則因為一則來自於七月份泰晤士報，有關於英國首相布朗公布其夏日讀書清單的新聞中，看到了他對知識的尊重。在這同時，吳重雨校長也思考著，要如何為學生準備追求知識的環境和激發他們對知識的尊重與喜愛。台積電張忠謀董事長曾陳述他 18 歲進入哈佛那一年，博覽文史哲理工經典群籍，至此奠定了他求知的基礎，並借海明威名言，將其改為「哈佛這一年為人生可帶走的盛宴。」吳重雨校長以張董事長的學習為借鏡，認為學生固然能藉由自我閱讀的方式學習到豐沛的知識，但透過名人、大師親臨現場地介紹經典書籍，更能加深學子們對於書籍的認識與興趣，這也是「新文藝復興閱讀計劃」 ( 以下簡稱 : 「經典名著選讀」 ) 活動展開籌劃的緣由。於是，吳重雨校長便積極敦請「交大通識教育委員會」，接手籌備本計劃的相關活動，而該中心也成為實際施行本計畫的策動、開課以及認證單位。至此，期許交大學子藉由閱讀、聽講來提昇人文素養、開拓視野的「新文藝復興閱讀計劃」，就此展開。
Quantum Chemistry Study on Internal Conversion of Diphenyldibenzofulvene in Solid Phase
(2011-12-22)
Li, Ming-Chung
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Hayashi, Michitoshi
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Lin, Sheng-Hsien
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應用化學系
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Department of Applied Chemistry
We investigate the nonradiative decay process of diphenyldibenzofulvene (DPDBF) in solid phase by using the quantum chemistry methods. To carry out the nonradiative rate constant calculation, we construct a solid phase model based on the ONIOM method. The geometry of the DPDBF molecule is optimized for the ground state by DFT and the first excited state by TD-DFT, and the corresponding vibrational frequencies and normal coordinates are computed. Under displaced-distorted harmonic oscillator potential approximation, Huang-Rhys factors are obtained. Vibronic coupling constants are calculated as a function of the normal mode based on Domcke's scheme. We find that vibronic coupling constants of 12 modes with large reorganization energies are of similar order, and if this result is still valid for other modes, the internal conversion rate would be determined by high frequency modes because they have a significant nuclear factor that is related to Franck-Condon overlap intergrals. We also find that geometrical changes are suppressed due to the stacking effect, which yields small Huang-Rhys values in the solid phase.
PLANAR ASYMMETRIC CROSSOVER COUPLER
(2011-12-22)
Kuo Jen-Tsai
;
Chiou Yi-Chyun
;
Chan Chi-Hung
A planar asymmetric crossover coupler has a first branch to a seventh branch. The first branch to the fourth branch form a first region having a first port and a fourth port. The fourth branch to the seventh branch form a second region having a second port and a third port. The characteristic impedance of each branch is determined according to the load impedance and power distribution ratio of each port.
Safrole-2 ',3 '-oxide induces cytotoxic and genotoxic effects in HepG2 cells and in mice
(2011-12-24)
Chiang, Su-yin
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Lee, Pei-yi
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Lai, Ming-tsung
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Shen, Li-ching
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Chung, Wen-sheng
Safrole-2',3'-oxide (SAFO) is a reactive electrophilic metabolite of the hepatocarcinogen safrole, the main component of sassafras oil. Safrole occurs naturally in a variety of spices and herbs, including the commonly used Chinese medicine Xi xin (Asari Radix et Rhizoma) and Dong quai (Angelica sinensis). SAFO is the most mutagenic metabolite of safrole tested in the Ames test. However, little or no data are available on the genotoxicity of SAFO in mammalian systems. In this study, we investigated the cytotoxicity and genotoxicity of SAFO in human HepG2 cells and male FVB mice. Using MTT assay. SAFO exhibited a dose-and time-dependent cytotoxic effect in HepG2 cells with TC(50) values of 361.9 mu M and 193.2 mu M after 24 and 48 h exposure. respectively. In addition, treatment with SAFO at doses of 125 mu M and higher for 24 h in HepG2 cells resulted in a 5.1-79.6-fold increase in mean Comet tail moment by the alkaline Comet assay and a 2.6-7.8-fold increase in the frequency of micronucleated binucleated cells by the cytokinesis-block micronucleus assay. Furthermore, repeated intraperitoneal administration of SAFO (15, 30, 45, and 60 mg/kg) to mice every other day for a total of twelve doses caused a significant dose-dependent increase in mean Comet tail moment in peripheral blood leukocytes (13.3-43.4-fold) and in the frequency of micronucleated reticulocytes (1.5-5.8-fold). Repeated administration of SAFO (60 mg/kg) to mice caused liver lesions manifested as a rim of ballooning degeneration of hepatocytes immediately surrounding the central vein. Our data clearly demonstrate that SAFO significantly induced cytotoxicity. DNA strand breaks. micronuclei formation both in human cells in vitro and in mice. More studies are needed to explore the role SAFO plays in safrole-induced genotoxicity. (C) 2011 Elsevier B.V. All rights reserved.
選戰逼近　旗幟滿天飛
(2011-12-25)
王俐文
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Department of Communication and Technology
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傳播與科技學系
每逢選舉，台灣的街景便「百家爭鳴」，四處都是候選人的旗幟和肖像。走在路上，一不小心就會踩中候選人的臉；上廁所時丟衛生紙，就又看到候選人的面孔躺在垃圾桶裡；開車騎車時，沿街的旗幟在身旁隨風狂舞，令人捏一把冷汗。
士林市場搬遷　吸客或阻客
(2011-12-25)
林冠儀
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Department of Communication and Technology
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傳播與科技學系
隨著士林市場改建工程完工，美食小吃雲集的士林臨時市場最近搬遷，陪伴台北人走過九年歲月的士林臨時市場，即將在12月25日吹熄燈號，而士林市場美食攤位地下化到底是好是壞，也引起不少討論。
來自邊陲的教育
(2011-12-25)
陳奕儒
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Department of Communication and Technology
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傳播與科技學系
在彰化高中圖書館裡，二三十個學生坐在位置上，聆聽一個學生發表自己的意見。他們即將代表彰化高中到日本做親善大使，由於機會難得每個學生都盡可能陳述想法。一個神情略帶疲倦的中年人，靠在書架上滿足的看著討論紛紛的現場。他是整個活動的發起人，也是這個高中圖書館的主任 – 呂興忠。
人潮背後
(2011-12-25)
胡哲揚
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Department of Communication and Technology
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傳播與科技學系
內灣，新竹的歷史與新商圈結合之處。每到假日，人潮洶湧。但是，光明背後總有著黑暗。
總編輯的話
(2011-12-25)
楊廣培
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Department of Communication and Technology
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傳播與科技學系
這兩天天氣突然轉冷，假如偶然想宅在電腦前面，我們喀報也是可以成為大家的眼睛，幫讀者們探索這個世界，以及它的人與事。本期的２5篇文章絕對可以擴大讀者的視野，其中關於人物和社會議題的報導各佔5篇和６篇之多，以圖片為主題的也佔據了6個位子。喀報的文章內容讓大家不出門也知天下事。
領對票　選對人
(2011-12-25)
賴映秀
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Department of Communication and Technology
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傳播與科技學系
民國101年元月14日將舉辦第十三屆總統副總統暨第八屆立委選舉，立委選舉採單一選區兩票制，每個投票人將同時領有三張選票，領對票才不會浪費自己寶貴的一票。
自然率真魏如萱
(2011-12-25)
林彥伶
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Department of Communication and Technology
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傳播與科技學系
不按理出牌，不管是聲音或音樂總是變幻莫測讓樂迷難以掌握，這就是「魏如萱」的音樂風格。新時代的獨立歌手魏如萱就像是魔術師，不斷地帶來音樂的驚喜，新專輯《不允許哭泣的場合》又再次帶給樂迷全新的精采。
那些年一起瘋狂的女孩
(2011-12-25)
許鈺煊
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Department of Communication and Technology
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傳播與科技學系
一群女孩，很傻很瘋，永遠用最真的一切寫下自己的青春。我很懷念，那些無所忌憚的日子；也很感謝，那些日子的笑與淚，堆疊成現在的自己。
歐洲　邂逅之後
(2011-12-25)
王升含
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Department of Communication and Technology
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傳播與科技學系
對、對、對，歐洲很美。但優雅精緻的背後暗含的歷史糾結和文化脈絡，得透過樸實、深沉的對話方可滲透。「哇！好美麗喔～」之後，到底蘊藏哪些元素，使歐羅巴成為今日另許多人又愛又恨的她？
新電腦時代
(2011-12-25)
李彥璋
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Department of Communication and Technology
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傳播與科技學系
數位時代的來臨，科技產業蓬勃發展，自電腦發明至今後，電腦、手機等３Ｃ產品已是一般大眾的必備品，如今平板電腦的誕生將在科技產業裡造成相當大的衝擊，證明後電腦時代即將來臨。