Browsing by Issue Date, starting with "2017-11-15"

Now showing 1 - 20 of 12763

Equalization of PAM-4 Signal Generated by Silicon Microring Modulator for 64-Gbit/s Transmission
(2017-11-15)
Tzu, T. C.
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Hsu, Y.
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Chuang, C. Y.
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Wu, X.
;
Chow, C. W.
We propose and demonstrate a 64-Gbit/s four-level pulse-amplitude-modulation transmission by using a limited modulation bandwidth silicon microring modulator (SiMRM) and the Volterra equalization scheme. Severe intersymbol interference caused by both the chromatic dispersion of the optical fiber and the bandwidth limitation of components can be compensated. Besides, several equalization schemes are compared and analyzed in terms of performance and complexity. In addition, the design and characteristics of the SiMRM used in the experiment are also discussed.
Extremality of numerical radii of matrix commutators and Jordan products
(2017-11-15)
Gau, Hwa-Long
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Wang, Kuo-Zhong
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應用數學系
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Department of Applied Mathematics
It is known that the numerical radius of the commutator (resp., Jordan product) AB - BA (resp., AB + BA) of two n-by-n matrices A and B is related to those of A and B by w(AB +/- BA) <= 4w(A)w(B). In this paper, we give complete characterizations of A and B for which the equality is attained. The matrices involved can be considered as elaborate generalizations of the equality-attaining A = [0 a (0 0)] and B = [0 0 (b) (0)]. (C) 2017 Elsevier Inc. All rights reserved.
Numerical ranges of products of two positive contractions
(2017-11-15)
Gau, Hwa-Long
;
Wu, Pei Yuan
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應用數學系
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Department of Applied Mathematics
Let A and B be positive contractions on a Hilbert space. It was known before that the numerical range W(AB) of their product is contained in the rectangular region [-1/8,1] x [-1/4,1/4]. In this paper, we determine exactly when W(AB) touches on its four sides. This follows from the more general information on a containing region of W(AB) and on when they share a common tangent line. We also give an example of A and B on three-dimensional space for which W (AB) is not symmetric with respect to the x-axis. (C) 2017 Elsevier Inc. All rights reserved.
Supply chain optimization of forest biomass electricity and bioethanol coproduction
(2017-11-15)
Liu, Wan-Yu
;
Lin, Chun-Cheng
;
Yeh, Tzu-Lei
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工業工程與管理學系
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Department of Industrial Engineering and Management
To establish a systematic and efficient forest bioenergy supply chain management system, most previous related studies did not investigate a system that involves generating two or more types of energy simultaneously, and did not consider the carbon emissions caused by electricity power generation of forest biomass combustion. Consequently, this study addressed the problems regarding the tactical supply chain optimization of a forest biomass electricity and second-generation bioethanol coproduction plant. A mixed-integer linear programming model was employed to determine the optimal production strategies to maximize the profit and to minimize the carbon emissions cost. The advantages of coproduction include enabling equipment and facility sharing, reducing investment costs, and dispersing the risks that involve raw materials, leading to synergy. Empirical simulation results indicated that the coproduction model yielded more profit than the independently operated model. When electricity demand is reduced, the coproduction model mitigates its profit losses through an increase in its bioethanol production. However, when faced with an increase in carbon emission costs, the coproduction model loses its advantages. According to the sensitivity analysis, electricity prices are the most vital parameter to the profit of the model, followed sequentially by the higher heating value of raw materials and carbon emission costs. (C) 2017 Elsevier Ltd. All rights reserved.
Chemical structures of extra- and intra-cellular algogenic organic matters as precursors to the formation of carbonaceous disinfection byproducts
(2017-11-15)
Hua, Lap-Cuong
;
Lin, Jr-Lin
;
Chen, Pei-Chung
;
Huang, Chihpin
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環境工程研究所
Algal eutrophication in reservoirs is frequently accompanied by a remarkable increase in the concentration of algogenic organic matter (AOM). Because AOM is well-known as an important precursor to disinfection by-products (DBPs) in drinking water, algal eutrophication poses severe concerns for public health. This study aimed to characterize the chemical properties of AOM from two major origins, i.e. extra-(EOM) and intracellular organic matter (IOM), of a commonly found green alga Chlorella sp. as precursors to trihalomethanes (THMs) and haloacetic acids (HAAs). Particularly, the corresponding relation between the chemical functional structure of EOM and IOM and their THM and HAA formation potential (THMFP and HAAFP) was comprehensively investigated. Results show that IOM chiefly comprised of aromatic and other aliphatic protein-like materials (high organic nitrogen content) those have high activity for chlorine substitution (high UV253/UV203 value) due to the high hydroxyl and amide contents in its chemical structures. EOM alternatively exhibited the characteristics of humic-and fulvic-like materials accompanying with high DOC/DON ratio and aromaticity. However, the chemical structure of EOM had a low tendency for chlorine substitution (low UV253/UV203 value); it was also accompanied by a considerable content of carboxylic moisture, which likely resulted in an unfavorable substitution reaction of EOM with chlorine. As a result, the carbonaceous DBP formation potential (C-DBPFP) showed that IOM yielded higher levels of both THMFP and HAAFP than that yielded by EOM.
恐懼的年代　
(2017-11-19)
戴葦婷
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Department of Communication and Technology
;
傳播與科技學系
在景美人權文化園區走進那令人恐懼的年代。
多元文化大雜燴　西門鬧區
(2017-11-19)
黃郁庭
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Department of Communication and Technology
;
傳播與科技學系
以照片呈現有著各式文化的西門町街頭。
於是我就這麼睡去
(2017-11-19)
郭庭芸
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Department of Communication and Technology
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傳播與科技學系
我總是在不應該睡著的時候睡著。以這樣的煩惱出發，我想做一些無理頭的插畫與小動畫。
漂流
(2017-11-19)
簡文怡
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Department of Communication and Technology
;
傳播與科技學系
對世界的害怕需要一個出口，我們值得被溫柔地接住嗎？
堅持對的事　呂植的保育之路
(2017-11-19)
葉宜瑩
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Department of Communication and Technology
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傳播與科技學系
呂植為「山水自然保護中心」創辦人，早期因保育熊貓而聞名，現在將視野擴大到保育其他物種。
惜食減塑推手　黃尚衍
(2017-11-19)
簡嘉瑩
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Department of Communication and Technology
;
傳播與科技學系
捨棄食材的華麗包裝，只剩對夢想的堅持和對這塊土地的熱愛。
夢
(2017-11-19)
巫尹文
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Department of Communication and Technology
;
傳播與科技學系
送給一個月前為了夢想而哭泣的自己。
基因轉殖大突破　泡泡龍新契機
(2017-11-19)
謝瀚陞
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Department of Communication and Technology
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傳播與科技學系
基因轉殖的技術讓罕見的遺傳性疾病患者看到了機會的曙光。
創作者新天地　手感市集
(2017-11-19)
楊巧柔
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Department of Communication and Technology
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傳播與科技學系
好好手感微笑市集，於遊客眾多的新北投捷運站旁進行設攤，吸引路過遊客前來參觀選購，提供創作者管道進行商品展示與販售。
棉花糖女孩當道嗎？
(2017-11-19)
楊佩臻
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Department of Communication and Technology
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傳播與科技學系
近年來「棉花糖女孩」的形象似乎越來越受歡迎，自信散發出的美才是最重要的，然而，人們真的不再以「瘦」為美了嗎？
總編輯的話
(2017-11-19)
顏維萱
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Department of Communication and Technology
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傳播與科技學系
本期為喀報275期，稿件數量共19件；其中包含社會議題1篇，人物特寫3篇，科技新知1篇，文化現象2篇，照片故事6篇以及自由創作6篇。本期頭題為楊佩臻的文化現象——「棉花糖女孩當道嗎？」，探討用來形容女性微胖身形「棉花糖女孩」一詞，其流行是否取代了「瘦即是美」的審美價值。
韓掀選秀熱潮　出道新型態
(2017-11-19)
蔡璨竹
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Department of Communication and Technology
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傳播與科技學系
韓國人笑稱：「現在除了我之外都是偶像嗎？」近年來韓國選秀節目崛起，透過事例來了解選秀成功之因。
左眼的獨白　失明舞蹈家張忠安
(2017-11-19)
林育平
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Department of Communication and Technology
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傳播與科技學系
失明舞蹈家張忠安，用舞蹈代替語言，向大眾訴說心底的世界與故事。
曾經的時代尖端　雨港之都
(2017-11-19)
陳咨諭
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Department of Communication and Technology
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傳播與科技學系
舊時代遺留下來的委託行與崁仔頂，藏身在巷弄，傍著海浪一同見證基隆的興衰。
被遺忘的國境之西　台西五條港
(2017-11-19)
黃昱晉
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Department of Communication and Technology
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傳播與科技學系
在台西五條港逐漸落寞的漁村中，看見在地的活力。