1,720,980 research outputs found
A Novel Differential-Mode Equalizer with Broadband Common-Mode Filtering for Gbps Differential Signaling
No full text在運用各種耦合傳輸線的高速差動信號傳輸系統中，維持差模信號的傳輸品質以及有效地抑制共模雜訊是確保接收端具有良好信號完整度的決定性因素。為此，我們提出了一個結合共模濾波器效果的新式被動等化器，其除了能夠等化差模信號外亦能過濾共模雜訊，名為「VCPW-R」。所提出之等化器可製作於封裝或印刷電路基板上，其具有價格低廉、體積小以及適用於不同傳輸速率之優點。
本論文將會先介紹幾種常見的耦合傳輸線，之後再描述所提出結構(即VCPW-R)的整體架構與相應的等效電路模型。此結構於差模及共模的傳輸特性分別利用奇模和偶模半電路進行分析。此外，我們也對此結構提出一個兼顧差模與共模傳輸特性之共設計流程，利用此設計流程針對8 Gb/s差動傳輸找出一組設計參數並用於實作測試電路板。根據實作板的頻域及時域量測結果，所提出結構之差模等化及共模濾波效果成功地獲得驗證。In high-speed differential signal transmission using various kinds of coupled lines, good signal integrity (SI) at the receiving end is mainly attributed to high quality of the transmitted differential-mode signal and effective suppression of the generated common-mode noise. In view of this, an innovative passive equalizer able to not only equalize differential-mode signals but also filter common-mode noise, named “VCPW-R”, is proposed so that the two modes can be well treated with a low cost, compact and adaptable structure on a package or PCB substrate.
After the discussion of the characteristic of typical coupled lines, the configuration and corresponding equivalent model of the proposed VCPW-R is described. The characteristics of the proposed structure under differential-mode and common-mode transmission are discussed separately with the corresponding half-circuit models. Based on the proposed co-design flow, which takes both modes into consideration, a set of the design parameters are determined for 8 Gb/s differential transmission and utilized in the fabrication of test boards. The frequency-domain and time-domain measurements of the test board successfully demonstrate the effectiveness of the proposed structure
Theoretical Calculation on Electronic Properties of Organic Light Emitting Materials
No full text摘要
本論文利用理論模擬計算來探討應用在有機發光二極體中的有機分子材料的特性。能階狀態密度、吉普士自由能差、能階、電子分布和分子軌域將被模擬計算並和實驗結果進行比較。本論文討論四種材料：8-羟基喹啉鋁(Alq3)的鋰錯合物、8-羟基喹啉鋁的鍶錯合物、氯化硼亞酞菁(SubPc)摻雜氟化鋰和N,N''-二苯基-N,N''-(1-萘基)-1,1''-聯苯-4,4''-二胺(NPB)摻雜氯化硼亞酞菁。在這些情況中皆發現了能帶差中的可存在態(Gap State)的存在。其中8-羟基喹啉鋁的鋰錯合物、8-羟基喹啉鋁的鍶錯合物、氯化硼亞酞菁摻雜氟化鋰等三種材料是N型摻雜，它們可被用在陰極來得到好的電性。而N,N''-二苯基-N,N''-(1-萘基)-1,1''-聯苯-4,4''-二胺摻雜氯化硼亞酞菁則可以被用在陽極。Abstract
Theoretical calculation is used to investigate characteristics of organic light emitting materials in this thesis. Density of states, difference of Gibb’s free energy, energy levels, electron population and molecular orbital are calculated and compared with experimental results. Four materials: Alq3-Li complex, Alq3-Cs complex, SubPc co-doping with LiF and SubPc doped NPB are discussed. Gap states are observed for these materials. N-type doping effects are found for Alq3-Li complex, Alq3-Cs complex and SubPc co-doping with LiF. They can be used in cathodes to get better electronic properties. SubPc doped NPB is used in anodes
Script-based Multi-video Summarization
No full text自動影像摘要近年來引起廣泛的討論。相關研究可細分為兩類，一為以靜態圖片為基礎之影像摘要，一為動態影片之影像摘要。近年來因電腦計算能力及媒體儲存容量快速增長，動態影片摘要可快速產生。然而先前並無劇本導向影像摘要之研究及多部影片摘要之相關實驗。本論文將探討針對使用者需求所產生之多部影片影像摘要。
我們採用語言方面之資訊和場景變化之資訊把影片分段。接著資訊檢索系統根據使用者需求找出相關之影片片段。影片sub-shot分群之結果用來衡量一影片片段視覺上新穎之程度。而結合這兩種分數可使我們選擇資訊上相關及視覺上生動的影片。
為了達到視覺上的平順，片段的重新排列亦被我們所考慮。我們分析了每個片段的影像內容。根據導演的節奏及一些經驗法則，我們提出了一可達到視覺平順之演算法。在實驗中證明在我們提出的四個演算法中，此種方法最能有效達到視覺平順，而不失去相關的資訊。Automatic video summarization methods have attracted research attentions for a long time. Previous works can be classified into two categories: keyframe-based video summarization and dynamic video summarization. Recently the rapid growth of computing power and storage capacity make it possible to generate dynamic video summaries much faster. However there is no previous work on generating video summaries according to specific user information needs and experiments on a multi-video environment. In this thesis we will explore the problem of script-based video summarization, in which the information needs are contained in a user script.
We first use linguistic information and shot boundary detection results to divide videos into segments, which are the foundation stones of building the summary. Then information retrieval system retrieves relevant segments using the user script as queries, and captions of the segments as documents. After sub-shot clustering, visual importance scores are evaluated for each segment based on the clustering results of its constituent sub-shots. The relevant score and the visual importance score are combined to select both informative and vivid segments.
To achieve better coherence, segment re-ordering is applied. We analyze the audio and video content, finding the editing rhythm and editing heuristics, and then develop an algorithm for visual coherence. Experiments show that this algorithm has better coherence compared with other text-based algorithm, without loss of informativeness.Table of Contents
Chapter 1 Introduction 1
1.1. Motivation 1
1.2. Related works 1
1.3. System architecture 4
1.3. Organization of the thesis 6
Chapter 2 Video Segmentation 7
2.1. Introduction 7
2.2. Video preprocessing 8
2.3. Shot boundary detection 8
2.4. Linking elements in Mandarin Chinese 9
2.5. The combining algorithm 12
2.6. Evaluation 14
2.6.1. Golden standard 14
2.6.2. Evaluation metric 14
2.6.3. Experimant results 16
2.6.4. Discussion 19
2.7. Conclusion 21
Chapter 3 Segment Selection 23
3.1. Text-relevant summaries 23
3.2. Visual-rich summaries 24
3.2.1. Introduction 24
3.2.2. Frame sampling 24
3.2.3. Sub-shot definition 24
3.2.4. Keyframe selection 26
3.2.5. Sub-shot clustering 26
3.2.6. Clustering result analysis 27
3.2.7. Visual importance score 30
3.3. Conclusion 31
Chapter 4 Video Summary Coherence 33
4.1. Introduction 33
4.2. Text-coherent summarization 34
4.3. Visual-coherent summarization 35
4.3.1. Visual dynamics modeling 35
4.3.2. Audio dynamics modeling 35
4.3.3. Editing rhythm mining 35
4.3.4. Algorithm 37
4.4. Experiment setup 38
4.5. Evaluation 40
4.6. Discussion 43
Chapter 5 Conclusion and Future Works 45
5.1. Conclusion 45
5.2. Future works 4
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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