1,721,165 research outputs found
Hung Fu, La géographie du thé
No full textAllix André. Hung Fu, La géographie du thé. In: Les Études rhodaniennes, vol. 9, n°3-4, 1933. pp. 283-286
Chung Chi Wang, La navigation du Yang-tseu
No full textHung Fu. Chung Chi Wang, La navigation du Yang-tseu. In: Les Études rhodaniennes, vol. 9, n°2, 1933. p. 159
Performance analysis of the IEEE 802.11-based wireless networks in the presence of hidden stations:
No full textThe IEEE 802.11 is the most widely used standard in WLAN currently. It can support not only a WLAN with an access point but also an ad hoc wireless network. The key for being able to support various wireless networks is the Distribution Coordination Function (DCF) which is one of channel access methods in the IEEE 802.11 Medium Access Control (MAC) protocol. The DCF is a random access method where each station has the right to initiate a transmission without any central coordination. Hence, this method is useable not only in infrastructure network configurations but also in distributed and self-organized wireless networks. However, this random access method unavoidably introduces the hidden station problem that multiple stations simultaneously transmit packets to a common destination resulting in packet collision at the destination. This problem results from that DCF does not support the destination coordinating the traffic inside its transmission range. The hidden station problem is unique to wireless networks and significantly degrades the performance of wireless networks, but this problem has been ignored in previous studies.
We propose our research work that model and analyze the performance of wireless networks including the hidden station effect in access-point and ad hoc type wireless networks. In access-point based wireless networks, we present a modified two-dimensional Markov chain model that characterizes the network performance in the presence of hidden stations. This model generalizes the existing work on IEEE 802.11 DCF performance modeling, and it is validated by comparison with ns-2 simulation. Second, in wireless ad hoc networks, the hidden station effect is different from that in an access-point based wireless network. Furthermore, this effect largely depends on the sender-receiver distance and physical carrier-sensing range. We devise a spatiotemporal analytical model that estimates the number of hidden stations based on the sender-receiver distance and physical carrier-sensing range. In addition, we also use our two-dimensional Markov chain model to evaluate the network performance under the hidden station effect in wireless ad hoc network. This result is in agreement with the result obtained by ns-2 simulation.Ph.D.Includes bibliographical references (p. 84-86)by Fu-Yi Hun
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
Coming Out and Telling Stories in Classrooms: The Analysis of LGBT Education Movement Led by Taiwan Tongzhi Hotline Association
No full text隨著2004年通過 《性別平等教育法》，性別教育在校園裡如火如荼地展開，當中的同志教育也開始萌芽。但同志議題並非藉由法律的力量就能順利地進入校園，中間的過程還需經過 不同行動者與策略才能完成。本研究以「台灣同志諮詢熱線協會」的教育小組為研究對象，透過實際的校園同志運動經驗，探討和理解法律與實作之間的差距與困境。首先，本研究發現同志教育在整個性別教育當中，仍處於邊緣的位置，此邊緣化的現象並非理所當然，而是實作上就受到課程安排的結構限制。在現實校園中，許多教育者也只把性別教育當成兩性平等，此種以「兩性」平權為核心思維的性別教育觀念無形地邊緣化同志議題。再來，本研究和社會運動中說故事的研究對話，當真實的同志運動者在教室出櫃現身說故事時，我發現在相對不自由的場域，同志運動者說故事會有不同的策略包裝故事，而非真實地訴說自己的生命經驗。在回應與「性」相關的問題時，運動者也有意識地使用轉化議題的技巧，避而不談敏感的情慾。最後，我觀察到運動者在一場接一場的演講中，開始和自己的生命經驗異化，說故事變成是一個抽離的工作。本研究也參考美國酷兒運動的兩種認同路線爭論，試圖分析同志教育在強調差異與強調相似之間的辯證關係，並反思「尊重多元」的精神應立基在差異而非相似。整體而言，儘管同志教育在校園中仍有爭議，但在傳遞「尊重多元」觀念上，同志現身於教室中說故事，仍為一項有力量的對話工具。When Gender Equity Education Act was prescribed in 2004, the gender education was starting in schools, including LGBT education. However, it was not successful to practice LGBT education in Taiwan’s schools. It still needs different actors and other strategies to involve this movement. I observed Taiwan Tongzhi hotline association (TTHA) as my object of study. Through the experience of TTHA’s LGBT movement in schools, I want to discuss the gap between the law and practice. First, I find LGBT education was still in a marginal place of the whole gender education. In practice, the school’s curriculum arrangement makes LGBT education in a limited structure, and many educators have just considered gender education as an education of sex equality. Secondly, based on conversation with storytelling in social movement studies, I find gay activist would not tell their true life stories. By using different strategies to change their own life stories, the activists can tell a good and positive story which avoiding bad plots. In response to students’ sexual questions, the activists consciously used transformational assimilation to talk sex without talking desire. Lastly, telling stories in classrooms unceasingly, the activists were aliened with their own life stories. Storytelling becomes an alienated job in the end. Compared with the argument between two gay groups in America queer movement, I try to analysis the dialectic relation between difference and assimilation on LGBT education, and support that “respects diverse gender” should be based on difference. As a whole, though LGBT is controversial in Taiwan, gay storytelling is still a powerful tool in dialogue and communication with heterosexual teachers and students
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
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