1,721,158 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
Analog-to-Digital Converter for Biomedical System
No full text在世界各地的大多數已開發國家，人口老齡化是一個普遍觀察到的現象。而電機電子領域人將研究重點從消費性電子產品轉向生醫應用。在這個趨勢下，我們設計適合應用於生醫系統的類比數位轉換器。 在本論文的第二章，我們將先介紹類比數位轉換器的基本理論。 在本論文的第三章，我們介紹一種利用單調式切換電容以減少功耗的連續漸進式類比數位轉換器。 在本論文的第四章，我們介紹一個輔助牙醫師診斷、治療阻塞性睡眠呼吸中止症的生醫系統晶片。 這些晶片都是使用UMC 0.18um CMOS的製程實現。Ageing population is a commonly observed phenomenon in most developed countries all over the world. Electrical engineers have turned their attention from consumer products to application in biomedical. We design ADCs that are suitable for biomedical application under this trend. In chapter 2, the fundamentals of analog-to-digital converters is introduced. In chapter 3 of this thesis, a low power successive approximation register analog-to-digital converter (SAR ADC) using monotonic switching procedure to decrease the power consumption is presented. In chapter 4 of this thesis, a biomedical system on chip (SoC) for smart oral appliance is introduced. These chips are fabricated in UMC 0.18 um CMOS process and the measurement results will be shown
The Study of Fund Performance and Investment Style around Management Changes: Evidence from Open-End Equity Funds in Taiwan
No full text本研究以1998年到2003年之間曾經發生經理人替換的74支台灣開放式股票型基金為研究對象，探討基金經理人替換前後，基金績效、風險、與風格型態的變化情形，並試圖找出造成經理人替換後基金績效、風險與風格型態差異的可能原因。本研究採用不同的方法檢測本文的研究假說，基金績效衡量方式包括：基金淨值報酬率排名百分比、Jensen績效指標與四因子績效指標；風險的測度有總風險與系統風險；基金風格型態的分類則是依照其資產配置情形進行區分。
本研究的實證結果顯示：一、基金在經理人替換後的平均績效比經理人替換前好，且基金在經理人替換後績效有改善的個數也比惡化的個數多，但只有淨值報酬率排名百分比的檢定結果為顯著。二、如果新任經理人未曾擔任過基金經理人者，則多數樣本基金在經理人替換後的績效有改善，但不具有統計上顯著的差異。然而，對於新任經理人曾經擔任過基金經理人而言，不同績效指標所得的結果並不相同，且都不具有統計上顯著的差異。三、在新任經理人是從其他投信公司挖角過來的前提下，不論基金成立時間的長短，不同績效指標所得的結果並不相同，且都不具有統計上顯著的差異。四、基金在經理人替換前屬績效差者，多數新任經理人傾向調高投資組合的風險，但只有系統性風險的檢定結果為顯著。然而，基金在經理人替換前屬績效好者，多數新任經理人會調降投資組合的系統風險，但並沒有顯著的差異。五、大多數的基金在經理人替換後仍維持相同的風格型態，且完全集中在大型成長。如果採用更細的風格分類方式，則基金在經理人替換後風格型態會有顯著的改變。此外，基金在經理人替換前的績效與風格移轉之間可能沒有關連。I examine changes in performance, risk, and investment style for mutual funds that replaced managers, and attempt to find the possible reasons that may explain the differences. I use a sample of 74 open-end equity funds during 1998-2003 in Taiwan. This study adopts different methods to check hypotheses. Fund performance measurements include the percentage rankings of the fund returns, Jensen alpha and Carhart's (1997) four-factor model. I employ the standard deviation of monthly returns and beta which proxy for total risk and systematic risk. The classification of investment style is based on the fund's asset allocations.
Results show that funds experiencing managerial changes performed better after the changes, but only the percentage rankings were found to be significant. If new managers hadn't been fund managers, fund performances improved after the management changes, but they aren't significant. Whether the funds' establishment time was long or short, new managers who were moved from another firm had uncertain performances. I document that funds' systematic risk increased significantly after the management changes, if former managers belonged to underperformers. More than 77 percent of the funds maintained the same style after the management changes, and centralize on large-cap/growth. Using detailed classification, funds experienced shifts in investment style significantly after the management changes. It had no relation between pre-replacement performance and style shift.謝 詞…………………………………………………………………iv
中文摘要………………………………………………………………v
英文摘要………………………………………………………………vi
目 錄…………………………………………………………………vii
表 次………………………………………………………………viii
第一章 緒論…………………………………………………………1
第一節 研究動機與目的…………………………………………1
第二節 文獻回顧…………………………………………………3
第二章 研究設計……………………………………………………5
第一節 研究假說…………………………………………………5
第二節 樣本選取與資料來源……………………………………7
第三節 研究方法…………………………………………………12
第四節 變數之操作性定義………………………………………17
第三章 實證結果與分析……………………………………………19
第一節 基金經理人替換前後之績效分析………………………19
第二節 新任經理人的操作經驗對基金績效之影響……………21
第三節 基金成立時間與新任經理人績效之關係………………25
第四節 經理人替換前的績效對新任經理人風險調整行為
之影響……………………………………………………29
第五節 基金經理人替換前後之風格分析………………………32
第四章 結論與建議…………………………………………………35
參考文獻………………………………………………………………3
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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