中國南海爭端下灰色地帶研究

南海區域長期以來存在很多領土爭議，中共建政後以歷史繼承方式宣稱擁有南海所有主權，持續不斷運用各種方法與手段在該區域擴張影響力，自2012年開始積極直接在南海爭議島礁上大興土木工程，完全沒有停止跡象，北京政府過去十年以來有計畫性挑選南海各處島礁實施各項建設，成立行政省區，為增加人造陸域面積，執行各種填海造陸方式，其建造速度快面積大，且為多形式多種類軍民事基礎設施，擴大部屬前進軍事基地，打造南海大戰略，以至於觸發區域內外國際各國敏感神經防線，區域內各聲索國提出強烈反對及海上衝突對峙，而區域外大國則以航行自由介入爭端，使其區域更加複雜化，近年來頻繁運用「灰色地帶」模式蠶食吞鯨，以新常態逐步推進，促使國際社會無法立即反制，本研究主要是能更加了解現今南海爭端下的新態樣

Efficient Light Harvesting/Extraction Schemes Employing Structure Designs from Microscale to Nanoscale for InGaN/GaN Devices

在本篇論文中，我們將先討論氮化鎵系的太陽能電池，接著為氮化鎵系的發光二極體，最後是我們的總結。 首先，在氮化銦鎵系的多重量子井太陽能電池上，利用自組裝的銀奈米小球當作蝕刻遮罩，去做反應式離子蝕刻，製做出二氧化矽奈米柱陣列。由於光捕捉效應及折射率的匹配(在空氣及元件間)，使此二氧化矽奈米柱陣列可有效地降低元件的表面反射率(從330至570奈米波段)。電池在模擬太陽光源(air mass 1.5G)的照射下，其短路電流明顯提升，而轉換效率可增加21 %。模擬軟體的分析也進一步証明此表面結構能改善電池的光伏特性。 第二，將太陽能電池的p型氮化鎵層製做成微米鐘的結構，也可以顯著的提升其轉化效率達102 %之多。此微米鐘結構能降低元件表面的反射率，增加電池的光吸收能力，並提升短路電流及填充因子。此經由磊晶直接成長出微米鐘的方法，可有效的改善元件的光伏特性。 第三，二氧化矽奈米柱陣列/p型氮化鎵微米鐘的分層結構被應用在氮化銦鎵的多層量子井太陽能電池上，以當作光擷取層。同樣以自組裝的銀球當作蝕刻遮罩來做反應式離子蝕刻，來將二氧化矽奈米柱陣列製作於p型氮化鎵微米鐘之上。由於此粗糙結構的光捕捉效應以及奈米柱具匹配的折射率，使得介面的菲涅耳反射(Fresnel reflection)能被更有效地降低。具此分層結構的電池表現出優異的光伏特性，能提升短路電流及填充因子，進而使轉換效率增加1.47倍。此外，元件光吸收能力的增加與以有限差分時域法(finite-difference time-domain, FDTD)分析的結果相吻合。 最後，我們將此分層結構應用在LED上，發現能增加LED的出光強度。與表面未經粗化的LED相比，在20mA注入電流下，微米鐘LED出光強度增強16.7 %，而奈米柱/微米鐘LED則增強了36.8 %之多。此結果歸因於粗化結構能使出射光散射並提供一等效折射率，來降低元件的內部全反射，進而提高光萃取率。此LED出光強度的增加也同樣可由有限差分時域法來分析得到。In this thesis, we will firstly focus on InGaN/GaN solar cells, and secondly we move to GaN/InGaN light emitting diodes. The final is our conclusion. First, SiO2 nanorod arrays (NRAs) are fabricated on InGaN-based multiple quantum well (MQW) solar cells using self-assembled Ag nanoparticles as the etching mask and subsequent reactive ion etching. The SiO2 NRAs effectively suppress the undesired surface reflections over the wavelengths from 330 to 570 nm, which is attributed to the light-trapping effect and the improved mismatch of refractive index at the air/MQW device interface. Under the air mass 1.5 global illumination, the conversion efficiency of the solar cell is enhanced by ~21 % largely due to increased short-circuit current from 0.71 to 0.76 mA/cm2. The enhanced device performances by the optical absorption improvement are supported by the simulation analysis as well. Second, InGaN-based multiple quantum well (MQW) solar cells (SCs) employing the p-GaN microdome were demonstrated to significantly boost the conversion efficiency by 102 %. The improvements in short-circuit current density (Jsc, from 0.43 to 0.54 mA/cm2) and fill factor (from 44 % to 72 %) using the p-GaN microdome are attributed to enhanced light absorption due to surface reflection suppression. The concept of microdome directly grown during SC epitaxial growth preserving mechanical robustness and wafer-scale uniformity proves a promising way in promoting the photovoltaic performances of SCs without any additional process. Third, the hierarchical structure of SiO2 nanorod arrays/p-GaN microdomes was applied as a light harvesting scheme on InGaN-based multiple quantum well solar cells. Using self-assembled Ag nanoparticles as the etching mask and subsequent reactive ion etching, SiO2 NRAs were fabricated upon the p-GaN microdomes. Due to the light trapping effect of the roughness and the improved match of refractive index by SiO2 nanorod arrays, the undesired Fresnel reflections are effectively suppressed. Cells with the hierarchical surfaces exhibit excellent photovoltaic performances including enhanced short-circuit current densities and fill factor, and the measured conversion efficiency is enhanced by 1.47-fold. The improved light absorption in device is consistent with the finite-difference time-domain analysis. Finally, we report the enhanced light extraction efficiency of the hierarchical structure, SiO2 nanorods/p-GaN microdomes, fabricating on InGaN/GaN LEDs. Compared with conventional flat LEDs, the light output intensity of bare microdome LED presents an improvement of 16.7 % at 20 mA, yet it boosts to 36.8 % for SiO2 NRA/p-GaN microdome LED. The results are attributed to the scattering effect and the effective refraction indexes of the textured structures that reduce the total internal reflection, contributing to the most light extraction. The enhanced optical performances are supported by the improved light output power calculated by finite-difference time-domain analysis

The Research of Vibration Analysis and Optimal Design on Electric Vehicle Drive System

本研究以華創/華擎車電開發之電動車為研究對象，進行電動車動力系統的振動分析和減振的優化設計。一開始根據文獻回顧，蒐集並歸納電動車動力系統（馬達、減速齒輪箱）模組化結構之振動原因，接著使用有限元素軟體Abaqus建立動力系統模型，並透過模態敲擊試驗驗證模型的準確性。本研究所建立之模型由實體元素和薄殼元素組成，且網格經適當分割，不僅品質較佳的網格可確保分析維持準確性，同時因大幅減少網格的數量，尚能節省大量軟體模擬運算時間。在振動分析中，分別就兩個主要影響振動的因素：馬達轉子動平衡，以及齒輪嚙合進行模擬，並探討個別因素對動力系統振動的影響程度。最後，透過改善振動源和增加結構剛性的方式，產出的優化設計可降低19.9%振動位移。This thesis studies the vibration influences on the whole drive system of vehicle for HAITEC/CECTEC’s EV car and proposes an optimal design which can reduce vibration. From literature review, this study summarizes the sources of vibration. Then this thesis uses finite element software: Abaqus to create whole model of the electric vehicle drive system. The accuracy of the finite element model is confirmed by the experiment of modal testing. The model is created by both solid and shell elements which is well meshed, so it has better quality and lower quantity of mesh elements, which can not only keep the precision of analysis but also decrease software simulation time. This thesis investigates and simulates two main sources of vibrations: rotor’s unbalance rotating mass and gear meshing during vibration analysis, then explores the importance between each reason and vibration of the whole drive system. At last, this thesis proposes a new optimal design which can lower 19.9% of vibration displacement by improving vibration sources and enhancing the stiffness of structure

寬頻網路技術與服務

[[abstract]]隨著網路的進步，各家的電信分分在搶客，佔據龍頭的是中華電信，是臺灣五大電信業者之一，為了想了解而開始進一步開始找尋資料、研究使大家更明白。 本研究欲將中華電信Hinet寬頻網路作為研究對象，分析其ADSL、VDSL、光纖服務的內容及優劣勢，除此之外，本研究亦探討行動網路3G至5G的發展，以及電信產業之相關競爭對手，並分析其未來發展可能性。 本研究結論如下： (一) ADSL、VDSL及光纖到府各有其特有技術發展及行銷方式。但是光纖到府才能滿足用戶頻寬需求，將會是未來發展趨勢。 (二) 行動網路的發展取代固網雖有其可能性，但還是存在部分問題需要解決，如基地台多用戶分享頻寬，容易有過載問題…等等。 (三) 多媒體影音服務方面，傳統的第四台業者面臨競爭對手的壓力及新進入者如OTT產業(如NETFLIX)蓬勃發展下，除了將兩者視為競爭對手加入內容產業外，尚有許多合作的可能性

聚集诱导发光

聚集诱导发光(AIE)是唐本忠院士于2001年提出的一个科学概念,是指一类在溶液中不发光或者发光微弱的分子聚集后发光显著增强的现象。高效固态发光的AIE材料有望从根本上解决有机发光材料面临的聚集导致发光猝灭难题,具有重大的实际应用价值。从分子内旋转受限到分子内运动受限,从聚集诱导发光到聚集体科学,AIE领域已经取得了许多原创性的成果。在本综述中,我们从AIE材料的分类、机理、概念衍生、性能、应用和挑战等方面讨论了AIE领域最近取得的显著进展。希望本综述能激发更多关于分子聚集体的研究,并推动材料、化学和生物医学等学科的进一步交叉融合和更大发展。 Aggregation-induced emission (AIE), conceptually coined by Prof. Ben Zhong Tang in 2001, refers to a unique photophysical phenomenon non- or weakly emissive luminogens in dilute solutions emit intensely upon aggregation. AIE can solve the aggregation-caused quenching problem that traditional fluorophores are suffering from and hold great technological values for practical applications. The past 20 years have witnessed the rapid development of AIE research, from the restriction of intramolecular rotations to restriction of intramolecular motions, and from AIE to aggregate science, and many original results have been achieved. In this review, we summarize the advances in the field of AIE and its related areas. We specifically discuss the recent progress in AIE area, including material classification, mechanism, concept derivation, property, applications, and challenges. It is hoped that this review will inspire more research into the molecular aggregate level and make significant advances in materials, chemistry and biological sciences