1,722,088 research outputs found
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
Canceller 를 이용한 Bluetooth 와 Wi-Fi 성능 향상
No full textBluetooth and Wi-Fi are two common wireless technologies today and are especially prevalent in smart phones. Although these two technologies are convenient, if the two are used simultaneously, performance degradation, such as throughput and communication valid distance, occurs.
This paper presents a simple and effective solution for resolving the in-device coexistence problem between Wi-Fi and Bluetooth. The main idea is to introduce a canceller in the circuit to cancel out the in-device interference when Wi-Fi and Bluetooth radios operate simultaneously in one device. Based on the testbed, extensive experiments were carried out to validate the performance of the proposed scheme. Our results show that the proposed solution gives substantially better performance than existing methods. Our results show that our proposed scheme provides more isolation to use AFH mechanism in small devices than current techniques. Our proposed approach, entitled the hybrid arbitrator, can significantly improve the performance of both of Wi-Fi and Bluetooth. ⓒ 2014 DGISTⅠ. INTRODUCTION
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Ⅱ. Background
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2.1 Bluetooth 4
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2.2 Wi-Fi 7
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Ⅲ. Existing solutions and limitations
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3.1 Existing solutions for coexistence of Wi-Fi and Bluetooth 12
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3.2 Limitation of existing coexistence solutions 14
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3.2.1 TDM-based solutions 14
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3.2.2 FDM-based solutions 15
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Ⅳ. Proposed scheme
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4.1 Canceller 17
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4.2 Cancellation channel setting 18
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4.3 Hybrid arbitrator 19
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Ⅴ. Experimental
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5.1 Canceller performance 21
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5.1.1 Canceller Arrangement 21
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5.1.2 Measurement of cancellation performance according to frequency 22
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5.1.3 Measurement of active cancellation performance using spectrum analyzer 23
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5.2 Measurement of real throughput 25
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5.2.1 Organization of test bed 25
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5.2.2 Case of Wi-Fi TX and Bluetooth RX 27
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5.2.3 Case of Wi-Fi RX and Bluetooth TX 28
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Ⅵ. Conclusion
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References 31최근 스마트폰과 같이 한 단말기에 Wi-Fi 와 Bluetooth 기능이 공존하는 기기가 많다. Bluetooth 와 Wi-Fi 는 같은 2.4GHz ISM band 를 사용하는데 동시에 무선통신이 이루어지면 상호간섭으로 인하여 통신 유효거리, 통신속도 등 성능저하가 일어 난다.이러한 문제를 해결하기 위하여 IEEE 802.15.2 표준이 있다. 이 표준에서는 PTA, AWMA, DSE, APSS, AFH 기법을 소개하고 있는데 그 중 AFH 방법이 가장 널리 사용되고 있다. AFH 방법은 Bluetooth 가 channel hopping sequence 를 결정할 때, 전체 채널의 noise level 을 검색하여 noise 가 많은 채널은 bad channel 로 등록하고 hopping sequence에서 제거하는 방법 이다. Wi-Fi 의 한 개 채널당 bandwidth 는 20MHz 이기 때문에 Bluetooth 가 사용하는 전채 bandwidth: 83.5MHz 에서 20MHz 를 뺀 나머지를 사용하면 될 것 같지만, 실제로 한 단말기내에서는 공간이 부족하여 Wi-Fi 와 Bluetooth 안테나가 가까이에 있어 Wi-Fi 가 송신신호를 내보낼 때, sideband lobe 가 영향을 주어 Bluetooth SINR 이 내려간다. 반대로 Bluetooth 가 송신신호를 내보내고 Wi-Fi 가 수신상황일 때도 Bluetooth 의 송신신호가 영향을 주어 Wi-Fi 수신 감도가 내려가게 된다.
이를 개선하기 위하여 본 연구에서는 Canceller 를 이용하였다. 송신신호를 Coupler를 통하여 1%의 cancel 신호와 99% 송신신호로 나누어 송신 신호는 안테나를 통하여 방사 시킨다. 이때 cancel 신호는 위상 반전 및 delay 를 이용하여 송신 신호의 위상과 반대되는 신호로 가공하고 수신안테나를 통하여 들어오는 자기 간섭신호와 합해져 간섭신호를 제거한다.
본 연구의 성능 검증을 위하여 실제 하드웨어를 설계하고 상용제품에 적용하여 적용전 후의 성능을 실험하였다. 실험 결과 송신성능의 저하 없이 수신성능이 Bluetooth 의 경우 약 50%, Wi-Fi 의 경우 약 20% 성능향상이 있었다.
본 논문에서 제안한 기술은 공간적으로 작게 설계가 가능함으로 상업적으로 즉시 사용이 가능하며, 이전에 존재하지 않았던 새로운 간섭제거 방법을 소개하고 있다. ⓒ 2014 DGISTMasterdCollectio
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
sj-docx-2-cpc-10.1177_10556656221105204 - Supplemental material for Comparison of Cleft Lip Nasal Deformities Between Lesser-Form and Incomplete Cleft Lips: Implication for Primary Rhinoplasty
No full textSupplemental material, sj-docx-2-cpc-10.1177_10556656221105204 for Comparison of Cleft Lip Nasal Deformities Between Lesser-Form and Incomplete Cleft Lips: Implication for Primary Rhinoplasty by Young Chul Kim, Dae Won Hong and Tae-Suk Oh in The Cleft Palate-Craniofacial Journal</p
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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