1,720,973 research outputs found
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
클러스터 파일 시스템들을 위한 홈 기반 상호 협력 캐쉬와 읽기/쓰기 단계 프로토콜
No full text학위논문(박사) - 한국과학기술원 : 전산학전공, 2006.2, [ viii, 82 p. ]Recently, there has been much research about cluster computing to achieve high performance using low cost nodes connected with high speed networks. In cluster computing, I/O operations are still a performance bottleneck because an I/O speed is much slower than any other component``s speed. To provide users with high performance I/O, many cluster I/O subsystems and mechanisms have been proposed such as cluster file systems, Cooperative Cache, collective I/O operations and so on.
In this work, we propose the new Cooperative Cache architecture and RW-phase protocol for scientific applications to improve the write performance of cluster file systems.
First, we propose the home-based Cooperative Cache. In the home-based Cooperative Cache, each block has it own home node and the home node is statically and globally determined. All information about a cached block is managed by the home node of the block and the home node does the write buffering as well as the read caching of the block. Using the home-based Cooperative Cache, a client can directly fetch a block from the home node of the block without contacting the manager as long as the block is in Cooperative Cache. Additionally, using the write buffering in home nodes, the home-based Cooperative Cache can improve write performance of I/O subsystems and can easily solve a false sharing problem in write-back Cooperative Cache because all small written data to a block is buffered in the home node of the block. For efficiently managing cached block in the home-based Cooperative Cache, we propose the new replacement policy named Pcs-LRU. Using Pcs-LRU, the home blocks can exist longer than the replication blocks in Cooperative Cache without the loss of the hit ratio. We also support the data migration for the making up the weak point of the static home management. Using the data migration, the data can be migrated to the frequently used node if the data is not accessed in the home node.
Second, to eliminate redundant o...한국과학기술원 : 전산학전공
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
The design and implementation of reliable network ram on Linux
No full text학위논문(석사) - 한국과학기술원 : 전산학전공, 2001.2, [ ii, 35 p. ]한국과학기술원 : 전산학전공
Structurchemistry of Rhenium-, Uran- and Goldfluorides
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#### Titelblatt
#### Inhaltsverzeichnis
#### Danksagung
1.
#### Einleitung
1
2.
## Theoretischer Teil
3
2.1.
Rhenium-Fluor Chemie
3
2\. 2.
##### Uran-Fluor Chemie
25
2\. 3.
### Gold-Fluor Chemie
40
3.
#### Experimenteller Teil
67
3\. 1.
Allgemeine Angaben
67
3\. 2.
Rhenium-Fluor-Verbindungen
69
3\. 3.
### Uran-Fluor-Verbindungen
85
### 3\. 4.
### Gold-Fluor-Verbindungen
### 105
4.
Zusammenfassung
132
5.
## Englische Zusammenfassung
134
6.
Literaturverzeichnis
136
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[if !supportEmptyParas] [endif]4. Zusammenfassung
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In dieser Arbeit wurden die Strukturprinzipien von Re- und
U-Oktafluorometallaten untersucht und Goldfluoride dargestellt.
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1\. Oktafluororhenate (VII) und Oktafluorouranate (VI)
Rhenium und Uran können in hohen Oxidationsstufen vorliegen. Ihre Ionenradien
sind relativ groß. Sie können deshalb stabile achtfach koordinierte
Fluorokomplexionen bilden.
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Für die folgenden Verbindungen wurden Einkristalle erhalten und die
Kristallstruktur bestimmt.
CsReF8 (NO)2UF8
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Die folgenden Oktafluororhenate(VII) und Oktafluorouranate(VI) wurden durch
Sublimation, Hochdruckfluorierung oder Festkörperreaktion in reiner Form
hergestellt und über ihre Raman-Spektren charakterisiert:
(NO)ReF8 (NO2)ReF8 (CH3)4NReF8
Cs2UF8 (NO2)2UF8 K2UF8
Die Spektren sind für alle genannten Verbindungen qualitativ sehr ähnlich. Das
legt eine ähnliche Anionengeometrie nahe.
Leider gelang weder Oktafluorouranat(V) rein darzustellen noch einen
Einkristall zu isolieren.
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Als vorläufige Strukturprinzipien kann man feststellen:
[if !supportLists]1. [endif]Die Geometrie von [if !vml][endif] und [if
!vml][endif] ist quadratisch antiprismatisch, unabhängig von der Art der
Kation.
[if !supportLists]2. [endif]Die gemittelten Winkel a als Maß der Verzerrung
des quadratischen Antiprismas hängen etwas von der Elektronkonfiguration am
Zentralatom ab.
4d10 : 57.6°
4d10 5s2 : 57.9°
5d1 : 57.9°
5d0 : 57.5°
5f0 : 57.0°
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Ein ?ideales? quadratisches Antiprisma hat a = 57.1°.
[if !supportLists]3. [endif]Die Bindungsabstände werden etwas vom Kation
beeinflußt und schwanken für [if !vml][endif] um ± 4 pm.
Zufallsentdeckungen waren die Verbindungen Cs(Re2N2F9) und Ca(H4)(U4O8F14),
deren Kristallstrukturen gelöst wurden.
Mit Hilfe von Einkristalldaten wurde auch die Struktur des ReF6 neu bestimmt.
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2\. Goldfluoride
Es wurden die folgenden Gold-Fluor-Verbindungen dargestellt und die Strukturen
bestimmt.
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O2AuF6 (AuF5)2
(Au3F7)(SbF5)3 (Au3F8)(SbF5)2 [Au(HF)2][(SbF6)2]·2(HF)
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Von Dioxygenylhexafluoroaurat(V) wurde eine neue Modifikation erhalten, die
eine geordnete Variante der bekannten Struktur darstellt.
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Goldpentafluorid ist offensichtlich das einzige Pentafluorid mit dimerer
Struktur im Festkörper. Nach ab-initio-Rechnungen ist AuF5 eine extrem starke
Lewis-Säure, stärker als SbF5.
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(Au3F7)(SbF5)3 ist eine gemischtvalente Gold(II/III)-Fluor-Verbindung, in der
quadratisch planare AuF4-Einheiten unendliche Bänder bilden.
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(Au3F8)(SbF5)2 besitzt eine Schichtstruktur der Konstitution
[AuII(AuIIIF4)2](SbF5)2. Durch Vergleich der Fluor-Brückenbindungsabstände in
der Au?F?Sb-Einheit kann man ableiten, daß AuF3 im Kristall ein stärkerer F--
Acceptor ist als SbF5.
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[Au(HF)2][(SbF6)2]·2(HF) ist die erste bekannte Au-HF-Koordinationsverbindung.
[if !supportEmptyParas] [endif]5\. Summary
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A number of gold fluor compounds have been synthesized and its structures
determined. Some structural principles of the octafluorometalates of Re and U
have been elucidated.
# 1. Octafluororhenate(VII) and Octafluorouranate(VI)
Re and U form high oxidation states. Even then their ionic radii are fairly
large. That is why Re and U are capable of forming stable eight coordinated
fluorocomplexes.
The following compounds were prepared and their crystal structures determined.
CsReF8 (NO)2UF8
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The following Octafluororhenates(VII) and Octafluorouranates(VI) were prepared
and characterized by Raman spectroscopy:
(NO)ReF8 (NO2)ReF8 (CH3)4NReF8
Cs2UF8 (NO2)2UF8 K2UF8
The spectra appear similar for all compounds.
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All attempts to prepare simple crystals of octafluorouranate(V) failed.
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Thus far the following structural principles seem valid for eight coordinated
fluorocomplexes:
[if !supportLists]1. [endif]The geometry of the anion is a fairly regular
square antiprism, regardless of the cation involved.
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[if !supportLists]2. [endif]The averaged angle a as a measure for the
distortion of the square antiprism depends somewhat on the electronic
configuration of the central atom:
4d10 : 57.6°
4d10 5s2 : 57.9°
5d1 : 57.9°
5d0 : 57.5°
5f0 : 57.0°
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Compare a = 57.1° for an ideal square antiprism.
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[if !supportLists]3. [endif] The M-F bonding distances are affected by cation-
anion interactions. For [if !vml][endif] distances reaming from 207 pm to 215
pm are observed.
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The compounds Cs(Re2N2F9) and Ca(H4)(U4O8F14) were obtained by accident. Their
crystal structures have been solved.
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The crystal structures of ReF6 has been redetermined from single crystal data.
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# 2. Gold fluorides
The following gold fluor compounds were prepared and their crystal structures
determined.
O2AuF6 (AuF5)2
(Au3F7)(SbF5)3 (Au3F8)(SbF5)2 [Au(HF)2][(SbF6)2]·2(HF)
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A new modification was obtained for Dioxygenylhexafluoroaurat(V) comprising an
ordering variant of the known (disordered) structure.
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Gold pentafluoride is the only pentafluoride with a dimeric structure in the
solid state. It is an extreme stronger Lewis-acid, even stronger than SbF5.
This is suggested by Ab-initio calculations.
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(Au3F7)(SbF5)3 is a mixed valence gold(II/III) fluor compound. The structure
comprises ribbons extending into infinity in one dimension.
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(Au3F8)(SbF5)2 comprises a layer structure. It may be written more
appropriately as [AuII(AuIIIF4)2](SbF5)2. Comparison of the fluor-bridging
distances in the (Au-F-Sb)-unit suggests that AuF3 is a stronger F- acceptor
than the SbF5 molecule in the solid state.
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[Au(HF)2][(SbF6)2]·2(HF) is the first know Au-HF-coordination compound.
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