Browsing by Issue Date, starting with "2017-01-02"

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Luminescence Enhancement and Enlarged Dirac Point Shift of MoS2/Graphene Hetero-Structure Photodetectors With Postgrowth Annealing Treatment
(2017-01-02)
Wu, Chong-Rong
;
Liao, Kun-Cheng
;
Wu, Chao-Hsin
;
Lin, Shih-Yen
;
影像與生醫光電研究所
Enhanced photoluminescence intensities are observed for the MoS2 film prepared by chemical vapor deposition (CVD) with an additional 850 degrees C postgrowth annealing procedure under sulfur-rich environment. The enlarged Dirac point shift of the MoS2/graphene hetero-structure photodetectors with the postgrowth annealing procedure suggests that more photoexcited electrons will transport to the graphene and effectively higher n-type doped the channel. The direct 2-D crystal hetero-structure growth by using CVD has avoided the complicated procedure of sequential attachment of different 2-D crystals, which is advantageous for the practical application of 2-D crystal heterostructures.
Surface roughness effects on aluminium-based ultraviolet plasmonic nanolasers
(2017-01-03)
Chung, Yi-Cheng
;
Cheng, Pi-Ju
;
Chou, Yu-Hsun
;
Chou, Bo-Tsun
;
Hong, Kuo-Bin
We systematically investigate the effects of surface roughness on the characteristics of ultraviolet zinc oxide plasmonic nanolasers fabricated on aluminium films with two different degrees of surface roughness. We demonstrate that the effective dielectric functions of aluminium interfaces with distinct roughness can be analysed from reflectivity measurements. By considering the scattering losses, including Rayleigh scattering, electron scattering, and grain boundary scattering, we adopt the modified Drude-Lorentz model to describe the scattering effect caused by surface roughness and obtain the effective dielectric functions of different Al samples. The sample with higher surface roughness induces more electron scattering and light scattering for SPP modes, leading to a higher threshold gain for the plasmonic nanolaser. By considering the pumping efficiency, our theoretical analysis shows that diminishing the detrimental optical losses caused by the roughness of the metallic interface could effectively lower (-33.1%) the pumping threshold of the plasmonic nanolasers, which is consistent with the experimental results.
無負擔生活產業發展協會，看見土地與社區的價值
(國立交通大學客家文化學院, 2017-01-05)
徐仟妤
沿著竹49線前行，城市的色彩漸漸褪去，逐漸被質樸的農村景觀景觀所取代。鄰近峨眉溪雲霧繚繞的山巒，栽植鴨間稻的農場，遍布山間的柑橘園，隱身高地的無菜單料理。這裡是峨眉鄉無負擔社區，一群對故鄉與土地懷揣熱情的小農，藉由生活產業發展協會立足於社區，將在地關懷通過社區參與及教育，轉化為實際的動能，為居民和土地帶來新的生機。
交大e-News第224期-交大120--時光寶盒典藏回憶-60年後再開啟
(2017-01-05)
國立交通大學秘書室
;
Secretariat
Low-complexity hopping DFT design based on a compact recursive structure
(2017-01-05)
Juang, W. -H.
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Lai, S. -C.
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Chen, K. -H.
;
Tsai, W. -K.
;
Luo, C. -H.
A novel hopping discrete Fourier transform (DFT) algorithm and its architecture design for efficiently computing time-frequency spectra are presented. Since the sliding process is adopted sample by sample, the spectral bin output data rate is the same as the input data rate. Under the conditions of an M-sample complex input sequence (M = 256), and N-point recursive DFT computation (N = 64) for time hop L (L = 4), the proposed method has the following advantages: (i) the computational complexity of Proposed-I requires only four complex additions and four complex multiplications for each frequency bin, after the first spectral component has been finally calculated; (ii) Proposed-II utilises a re-timing scheme to greatly shorten and balance the critical path; (iii) Proposed-II is less computationally complex than Wang et al.\'s method, as the numbers of multiplication and addition operations in the proposed algorithm are 768 and 1024, representing reductions of 50 and 20%, respectively. In addition, the number of coefficients can be reduced by 50% compared with Park et al.\'s method. In the FPGA implementation, the proposed design can be operated at 47.26 MHz. It is thus more suitable for use with real-time analytic applications of time-frequency spectra.
Finite elements in flow problems 2015, Taiwan
(2017-01-05)
Lin, Chao-An
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Bazilevs, Yuri
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Brummelen, E. Harald
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Chen, Ching-Yao
;
Takizawa, Kenji
Electrically Pumped III-N Microcavity Light Emitters Incorporating an Oxide Confinement Aperture
(2017-01-05)
Lai, Ying-Yu
;
Chang, Tsu-Chi
;
Li, Ya-Chen
;
Lu, Tien-Chang
;
Wang, Shing-Chung
In this work, we report on electrically pumped III-N microcavity (MC) light emitters incorporating oxide confinement apertures. The utilized SiO2 aperture can provide a planar ITO design with a higher index contrast (similar to 1) over other previously reported approaches. The fabricated MC light emitter with a 15-mu m-aperture shows a turn-on voltage of 3.3 V, which is comparable to conventional light emitting diodes (LEDs), showing a good electrical property of the proposed structure. A uniform light output profile within the emission aperture suggesting the good capability of current spreading and current confinement of ITO and SiO2 aperture, respectively. Although the quality factor (Q) of fabricated MC is not high enough to achieve lasing action (similar to 500), a superlinear emission can still be reached under a high current injection density (2.83 kA/cm(2)) at 77 K through the exciton-exciton scattering, indicating the high potential of this structure for realizing excitonic vertical-cavity surface-emitting laser (VCSEL) action or even polariton laser after fabrication optimization.
〈小村子〉看見女性育兒不為人知的憂愁
(國立交通大學客家文化學院, 2017-01-05)
戴淨妍
隱藏在錯綜複雜的農田與村落中，是新竹市千甲里集會所，當你想走近一探究竟，便能聽見孩童的笑聲滿溢出集會所的大門，因為這裡同時也是〈小村子mama teams up〉的集會所，由創辦人高雅雪所成立的社會企業，專門解決年輕媽媽在辛苦的育兒之路中所遇見的各種疑難雜症。
Radial flows in heterogeneous porous media with a linear injection scheme
(2017-01-05)
Chen, Ching-Yao
;
Yan, Pei-Yu
;
機械工程學系
;
Department of Mechanical Engineering
A robust diffuse-interface formulation is applied to simulate miscible and immiscible radial flows in heterogeneous porous media, in which the permeability is characterized by a log Gaussian distribution. The stabilizing effects of linear injection scheme, determined by the fingering interfacial length, are investigated to verify its applicability in various conditions of miscibility and permeability heterogeneity. For fully miscible conditions, the linear injection scheme shows destabilizing effects both in homogeneous and heterogeneous media. On the other hand, even the immiscible fingering instability in a homogenous medium can be suppressed effectively by applying the linear injection scheme, the stabilizing effect on such a linear injection scheme is insignificant in a heterogeneous medium. (C) 2015 Elsevier Ltd. All rights reserved.
〈小村子〉母語日文化傳承的展現
(國立交通大學客家文化學院, 2017-01-05)
戴淨妍
　每個星期三，〈小村子〉便會在基地裡舉辦母語日活動，他們主張，「你說你的母語，我說我的母語」，創造一個和諧的母語環境，而非聚焦在某個特定的語言上是他們的理念。每一周都會有一個媽媽老師教大家說她的母語，而記者採訪時(2016/12/7)，他們請到的是教授閩南語的媽媽，小孩與大人齊聲念出了閩南語童詩，形成親子共學的歡樂景象，而另外有一位老師也同樣會在母語日的時候教大家唸客家話。
PRISM GROUP AND PROJECTION APPARATUS
(2017-01-05)
Jui-Wen Pan
;
Yung-Chih Huang
;
Ping-Chun Lin
;
Che-Wen Chiang
A prism group including a first, a second, and a third prisms is provided. The first prism has a first light incidence surface, a first light emitting surface, and a first connecting surface. The second prism has a second light incidence surface, a second light emitting surface, and a second connecting surface. The second light incidence surface is located between the first light emitting surface and the second light emitting surface. A first air gap is between the second light incidence surface and the first light emitting surface. The third prism has a third light incidence surface, a third light emitting surface, and a third connecting surface. The third light incidence surface is located between the second light emitting surface and the third light emitting surface. A second air gap is between the third light incidence surface and the second light emitting surface. A projection apparatus is also provided.
共學共耕共食，以老人關懷促進社區認同
(國立交通大學客家文化學院, 2017-01-05)
徐仟妤
什麼是老人共食？如何提升土地意識與社區認同感？位於新竹縣峨眉鄉的無負擔社區，當地居民與小農共同成立無負擔生活產業發展協會（簡稱無負擔協會），透過老人關懷以及食農教育，讓社區長者有了不一樣的老年體驗。
小檔案：何謂Play Group？
(國立交通大學客家文化學院, 2017-01-05)
戴淨妍
Play Group，簡稱PG，由少數幾對母親與孩子組成的遊戲小組，約定一個固定的時間進行活動，旨在增加幼童間接觸學習的機會。
小檔案：灌行農法與友善耕作
(國立交通大學客家文化學院, 2017-01-05)
徐仟妤
傳統的灌行農法（Conventional Agriculture）為現今多數一級產業使用的作法，其優點為能減少人力、物力的耗費與農損，並且讓產量極大化。通常大量使用農藥與化學肥料，灌行農法所栽種出來的農作物於市面上大量流通，但長期使用容易造成地力枯竭甚至酸化，並殘留相關化學物質於人體。友善農法（Sustainable Agriculture）則為不施放農藥及化學肥料的耕作方式，促進環境與生物的循環。然而，化學物質殘留同時也會受到外在條件干擾，如鄰田汙染。一般採行友善農法的農產品，需要經過嚴格毒物篩檢才可被認證為有機，讓多數小農心有餘而力不足。2016年新政府上台後即將訂定機農業專法，草案中已明確納入未經第三方驗證的友善耕作。
Radial flows in heterogeneous porous media with a linear injection scheme
(2017-01-05)
Chen, Ching-Yao
;
Yan, Pei-Yu
;
機械工程學系
;
Department of Mechanical Engineering
A robust diffuse-interface formulation is applied to simulate miscible and immiscible radial flows in heterogeneous porous media, in which the permeability is characterized by a log Gaussian distribution. The stabilizing effects of linear injection scheme, determined by the fingering interfacial length, are investigated to verify its applicability in various conditions of miscibility and permeability heterogeneity. For fully miscible conditions, the linear injection scheme shows destabilizing effects both in homogeneous and heterogeneous media. On the other hand, even the immiscible fingering instability in a homogenous medium can be suppressed effectively by applying the linear injection scheme, the stabilizing effect on such a linear injection scheme is insignificant in a heterogeneous medium. (C) 2015 Elsevier Ltd. All rights reserved.
METHOD FOR CONSTITUTING HYBRID NETWORK SPANNING TREES, METHOD OF REDUNDANCY, AND CONTROL SYSTEM THEREOF
(2017-01-05)
SHIE-YUAN WANG
;
CHIA-CHENG WU
The disclosure is related to a method for constructing hybrid network spanning trees, a method of redundancy, and a control system thereof. The method and system are adapted to a hybrid network system including at least one software-defined network (SDN) and at least one non-SDN network. In the method, a controller of the SDN is employed to collect network packets over the hybrid network. After analyzing the information carried in the network packets, the information relating to the topology can be obtained. Therefore, all the possible spanning trees can be constituted according to the topology. As well, the path delay and path bandwidth respectively for the SDN and non-SDN can also be obtained. The information allows the system to render utility function for every spanning tree. The most suitable spanning tree over the hybrid network system is applied. A mechanism of redundancy is also provided.
東里家風　百年古厝的溫情
(國立交通大學客家文化學院, 2017-01-06)
張巧宜
位於苗栗縣苑裡鎮北邊的苑坑里，客家與閩南族群雖各佔一半，但客家人大部分已經被同化，語言以閩南話為主。反映苑裡地區的族群特色，東里家風融合客家、閩南建築特色，是苑坑鄭家聚落的三合院建築，也是目前台灣少見保存良好的紅磚瓦與交趾陶建築物。透過提供一日導覽、民宿以及餐飲，東里家風提供弱勢者和附近居民工作機會，並繼續維修古厝保存文化，達到多元關懷的目標。
農村再生　拍戲成最大特色
(國立交通大學客家文化學院, 2017-01-06)
張巧宜
台南市後壁區無米樂社區的荷蘭井民宿，同樣以一座三合院為主軸，因有一口三百年的荷蘭井而命名。原本古厝因農村人口外移已無人居住，黃永全承租下來改造，成立民宿。庭院常舉辦各種農村體驗活動，也同樣提供割稻飯供遊客享用，民宿也只有公共衛浴，情況與東里家風非常相似。
小檔案：東里家風
(國立交通大學客家文化學院, 2017-01-06)
張巧宜
A novel point cloud registration using 2D image features
(2017-01-07)
Lin, Chien-Chou
;
Tai, Yen-Chou
;
Lee, Jhong-Jin
;
Chen, Yong-Sheng
;
資訊工程學系
Since a 3D scanner only captures a scene of a 3D object at a time, a 3D registration for multi-scene is the key issue of 3D modeling. This paper presents a novel and an efficient 3D registration method based on 2D local feature matching. The proposed method transforms the point clouds into 2D bearing angle images and then uses the 2D feature based matching method, SURF, to find matching pixel pairs between two images. The corresponding points of 3D point clouds can be obtained by those pixel pairs. Since the corresponding pairs are sorted by their distance between matching features, only the top half of the corresponding pairs are used to find the optimal rotation matrix by the least squares approximation. In this paper, the optimal rotation matrix is derived by orthogonal Procrustes method (SVD-based approach). Therefore, the 3D model of an object can be reconstructed by aligning those point clouds with the optimal transformation matrix. Experimental results show that the accuracy of the proposed method is close to the ICP, but the computation cost is reduced significantly. The performance is six times faster than the generalized-ICP algorithm. Furthermore, while the ICP requires high alignment similarity of two scenes, the proposed method is robust to a larger difference of viewing angle.