1,720,956 research outputs found
Style Transformation and Mesh Deformation for 3D Content Creation
No full text三維模型(3D model)的製作以及其動作的生成，一直是電腦圖學中重要的研究，主要原因是良好的三維模型，在製作上相當困難以及耗費時間，在應用上總是帶來許多負擔。本論文中提出一套新的系統，讓使用者能藉由一個基本模型(base model)，利用此系統快速地製作出使用者指定之風格的良好三維模型，在有需要很多同質性、類似的三維模型時，能大大的縮短生產時間。
首先系統需要得到一個基本模型，以及使用者給定欲變形之形狀，並在這兩樣資訊上給定特徵點對應(features mapping)的限制，使系統得知重要的輪廓及變形的形狀。接著藉由風格轉換(style transformation)的技術，並配合模型變形(mesh deformation)的演算法，將基本三維模型轉換成符合使用者需求的新三維模型。
此系統在相似性高、重複性高的三維模型上效果顯著，例如需要數百隻的魚群、顛峰時段馬路的車輛、或是一支軍隊，利用此系統，則使用者只需要產生一個基本的三維模型，便可快速大量生產其類似卻具有不同風格之新三維模型，對於電腦圖學領域上的有相當大的助益。The generation of 3D models and their animations has been an important issue in computer graphics research. The main reason is the difficulty to create a exquisite 3D model. And in the process of creation, it usually costs very much and wastes long time. This paper will propose a new system that enables users to start from a base model with animation data, rapidly manufacture a well-designed 3D model. This is really effective and time-saving, especially when requiring many similar 3D models.
In the beginning, the system requires a basic model and also a shape for deformation. Based on the information mentioned above, users should provide constraints of features mapping, in order to inform the system of the main contours and the shape of deformation. According to the style transformation technique, accompanies with the algorithm of mesh deformation, the system can transfer a basic 3D model to a new 3D model as users wish. The system is even more effective when it comes to highly resemble and repeating models and it is really helpful for the computer graphics area
Reliability Assessment of Electronic Connectors Based on Multiple-Stress Accelerated Life Test
No full text 本論文根據複合應力加速測試結果探討電子連接器端子的可靠度。一般而言，連接器端子在單一廣義應力加壓下，具有良好的抵抗力與高可靠度，但為能確切分析其失效模式與壽命分佈，需要設計適當的複合應力加速測試，此複合應力包含溫度、濕度、腐蝕氣體濃度、插拔次數與連接器本身的抗應力因子—鍍層厚度。在適當複合應力組配下完成各實驗後，本論文採用非線性迴歸分析，套用至相關加速模型，並依據可靠度理論分析實驗數據。若將連接器端子在正常環境作用下之壽命稱為正常壽命，分析結果顯示，正常壽命是在溫度393 K之加速環境作用下壽命的97.09 倍、在濕度90 %之加速環境作用下壽命的1.23倍、在插拔次數300次之加速環境作用下壽命的1.04倍、在腐蝕氣體倍率1.0之加速環境作用下壽命的1.72倍。此型連接器端子在正常環境作用下，如果鍍層厚度為50微英吋，則其平均壽命可達28.1年、標準差為10.5年；如果鍍層厚度調整為40微英吋，其平均壽命變為26.6年，標準差變為10.0年；如果調為30微英吋，則其平均壽命變為24.2年，標準差變為9.1年；調為20微英吋，平均壽命變為19.9年，標準差變為7.5年。To understand the failure mode and the characteristics of life distribution of system or components of electronic products in a short time, accelerated test has become an important test in industry. Temperature, humidity, electricity voltage or the processing cycles stress are often the factors tested. In the traditional accelerated test, most of the generalized stress tests combine one or two elements. However, the research object of this dissertation, electronic connector pins, have already exhibit high reliability and great resistance to the simple environmental stress tests. In order to analyze their failure modes and the characteristics of life distribution more accurately, a multiple stress accelerated test is designed which includes factors such as temperature, humidity, density of mixed eroding gas, plugging and unplugging cycles, and plating thickness, latter of which has stress resistant capability itself. The methodology adopted here to analyze the experiment data is the nonlinear regression, based on reliability theory and applied to the accelerated model.
If the life of connector pins under normal environment is defined as a normal life span. Research analysis shows that normal life span is 97.09 times more than the life span under the accelerated temperature 393 K condition, 1.23 times more under the accelerated humidity 90 % condition, 1.04 times more for plugging and unplugging cycles 300, and 1.72 times more under the accelerated eroding gas density 1.0, independently. The average life with plating thickness of 50 μ" in the regular environment is 28.1 years and its standard deviation is 10.5 years. 26.6 years of average life and 10.0 years of standard deviation are the data for plating thickness of 40 μ". 24.2 years of average life and 9.1 years of standard deviation are shown for plating thickness of 30 μ". 19.9 years of average life and 7.5 years of standard deviation are n for plating thickness of 20 μ"
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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