1,720,984 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
No full textWe 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
DRIFT CONTROL DEEP BEAM-TO-DEEP COLUMN SPECIAL MOMENT FRAMES DENGAN SAMBUNGAN RBS
No full textBeams having high flexural stiffnesses can be utilized to reduce the building drifts to
conform within the code requirements. However the large flexural capacities of the beam will
increase strength demand of the connection. To avoid the plastic hinges at the connections, the
beam-column connections should be designed based on the maximum possible beam flexural
strength which is about (1.1-1.2)RyMp. If the top and bottom flanges of the beam are welded
directly to the column flange using complete penetration groove welds which have the weld tensile
capacity of 0.9FyA, the tensile force in the beam flange is potentially greater than the weld tensile
capacity so that some reinforcements, such as cover plates or side plates, are required.When RBS
connection is chosen, the flange cut near the ends of the beam will reduce Mp and the tensile force
in the beam flange will be reduced as well so that the need for coverplates can be eliminated. The
span to depth ratio of a deep beam in steel moment resisting frame generally is not large, the
interaction between shear and bending moment should be checked in the design of the beam and
the connection. In this paper the design of RBS connection for deep beam to deep column special
steel moment resisting frames is doneusing a different approach than the one in the AISC 341-05.
Experimental and analytical studies have shown that Euler-Bernoulli hypothesis can not be applied
at the connection region. Therefore the truss-analogy model will be used to express the flow of the
forces at the connection, starting from the face of the column to the centroid of the plastic hinge.
Truss-analogy model developed by Arlekar and Murty will be used to design the beam-column
connection, coverplate in this model will be eliminated but the vertical rib is kept. Combination of
deep beam and deep column in steel moment resisting frames will make better drift control,
economical connection is realized through the RBS connection
Composite Column Force Transfer in Special Two-Story X-Braced Frames
No full textReseach results have shown that columns in low-to-medium rise special two-story X-braced frames should be
designed based on the capacity of the braces because of high column demands. Composite columns, either encased of filled, can be an economical solution to deal with the additional axial load capacity over that available with steel columns alone.
Forces must be transferred between steel and concrete in composite columns so that dissimilar materials can achieve a state of equilibrium and act in a composite manner. With the new 2010 AISC Specification for Structural Steel Buildings, the provisions for force transfer have been greatly expanded in a new section to address the lack of clarity in previous Specification. The concept of load introduction length (AISC Specification I6.4) will be applied in the design the composite columns in low-to-medium rise special two-story X-braced frames with particular emphasis on the headed stud anchor provisions as they relate to load transfer. The clearer guidance in addressing component behaviour, design techniques, and proper detailing considerations in the 2010 AISC Specification will be followed
Aplikasi Sambungan RBS pada SRPMK dengan Kolom Dalam
No full textSalah satu cara efektif untuk mendapat kemampuan pemencaran energi tinggi pada rangka baja terbuka adalah dengan membuat coakan pada sayap atas dan bawah balok di dekat muka kolom. Hasilnya adalah sambungan momen yang dikenal sebagai sambungan Reduced Beam Section (RBS). AISC telah membentuk Connection Prequalification Review Panel (CPRP) suatu badan independen yang melakukan review terhadap data hasil tes sesuai lampiran P dari ANSI/AISC 34105.
Cara yang termudah dan juga murah untuk memenuhi ketentuan perencanaan tahan gempa untuk Sistem Rangka Pemikul Momen Khusus (SRPMK) adalah dengan memakai dokumen hasil kerja CPRP.
Sambungan momen RBS merupakan salah satu sambungan yang direkomendasi oleh CPRP. Pendetilan sambungan ini sesuai
format ANSI/AISC 358-05. FEMA-350-00 merekomendasi sambungan RBS untuk kolom W12 dan W14 namun ANSI/AISC 358-05 telah memperluas rekomendasi ini untuk kolom dalam, sehingga sambungan RBS dapat dipakai sampai kolom W36. Sambungan RBS, meskipun perilaku histeretisnya bagus, punya kelemahan yaitu interaksi instabilitas lokal dan lateral yang dampaknya mengurangi kemampuan balok mendukung beban. Semakin ketatnya batasan simpangan antar lantai pada peraturan yang berlaku saat ini menuntut kekakuan lateral yang lebih besar pada struktur, salah satu cara untuk mendapatkan struktur yang lebih kaku adalah dengan menggunakan kolom dalam. Struktur baja enam
lantai tahan gempa, dengan penahan gaya lateral berupa sistem ganda pada satu arah dan SRPMK dengan kolom dalam pada arah yang lain akan direncanakan dengan sambungan RBS. Batasan-batasan dari ANSI/AISC 358-05 dan ANSI/AISC 341-05 dipakai dalam perencanaan ini
SEISMIC COLUMN DEMANDS PADA SISTEM RANGKA BRESING KONSENTRIK KHUSUS DENGAN BRESING TIPE X DUA TINGKAT
No full textKeuntungan Sistem Rangka Bresing Konsentrik Khusus (SRBKK) dalam desain baja seismikadalah faktor R tinggi dan kontrol terhadap drift yang sederhana. Bresing tipe Chevron saat ini banyak dihindari pemakaiannya karena mengharuskan balok untuk dirancang terhadap gaya tidak
seimbang yang timbul akibat redistribusi gaya gaya dalam saat bresing yang mengalami gaya desak tertekuk. Alternatif bresing Chevron adalah bresing tipe X dua tingkat (two-story X bracing) yang bisa menahan gaya tidak seimbang pada balok sehingga penampang balok menjadi lebih kecil.
Namum hasil studi pada tiga SRBKK (3, 9 dan 18 tingkat) oleh Richards (2009) dengan analisis beban dorong statik dan analisis dinamik non-linier dengan 10 rekaman gempa menunjukkan bahwa normalized column demands yaitu rasio antara gaya aksial maksimum (P) terhadap gaya aksial
beban lateral elastik ekivalen (Pe) mencapai Pu/Pe
Universitas Udayana – Universitas Pelita Harapan Jakarta – Universitas Atma Jaya Yogyakarta
u
= 4,2 untuk kolom tingkat pertama dan kedua
pada SRBKK 3 tingkat, 2,2 ≤ P
≤ 4,8 untuk semua kolom pada SRBKK 9 tingkat dan 1,8 ≤
P
u
/P
e
u
/P
e
≤ 5,0 untuk kolom tingkat lima ke atas pada SRBKK 18 tingkat. Hasil studi ini menunjukkan
bahwa seismic column demands (P
) pada SBKK dengan tingkat rendah dan sedang bisa melebihi
Ω
o
P
e
= 2 P
e
u
untuk yang dipakai dalam desain (Ω
= 2 pada ICC 2006). Kajian terhadap
hasil studi ini menunjukkan tekuk pada bresing menyebabkan redistribusi gaya gaya dalam sehingga
o
menaikkan sangat drastis beban aksial kolom, jauh lebih besar dari system overstrengh factor hasil analisis beban dorong statik. Jadi desain kolom pada SRBKK dengan tipe bresing X dua tingkat harus memperhatikan redistribusi beban setelah bresing desak tertekuk, sama seperti desain balok pada SRBKK dengan bresing tipe Chevron, kolom harus dirancang berdasar gaya aksial maksimum yang besarnya tergantung pada kapasitas tarik dari bresing. Prinsip perencanaan kapasitas dipakai untuk menentukan besar gaya aksial kolom maksimu
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