1,720,977 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
Modified model reference adaptive control using lyapunov rule for power module in nuclear reactor system
Get PDFReactor TRIGA PUSPATI (RTP) was successfully installed in 1982 at Malaysia Nuclear Agency and has been conducting safe operation for more than 35 years. It is the only research reactor in Malaysia. RTP is a TRIGA Mark II pool-type reactor, with 1 MW thermal power. The power system of the RTP was currently upgraded from relay mode to automated power control system. The safety features of the system also have been designed to avoid any abnormality in the electronic and associate components that may lead to uncontrolled rate of reactivity The reactivity and reactor power are controlled by the movements of four control rods, known as Safety, Shim, Regulating, and Transient. Currently, the RTP using PI controller indicates transient response with longer settling time and rise time. Thus, the efficiency of the reactor core is reduced and the reactor’s lifetime is shortened. Since the RTP is very important in various research fields, transient performance is vital. To overcome this problem, are quite challenging using PI controller since this controller are not capable to improve the transient response without produce overshoot and keep maintaining the steady state error less than 1% FP. Therefore, to solve this problem, it is necessary to design a controller that good in tracking and confirms the stability of the system.
This research use Model Reference Adaptive Control MRAC controller to control the RTP power level because it good in adaptation and have a reference model. Even though the MRAC confirm the stability, but it gives unsatisfied performance to track the reference model. Thus, the modified (MRAC) with Lyapunov rule was proposed. The RTP model was modelled using a system identification method from its real-time power operation. Pole placement technique was applied to design the reference model with 47.8% ratio of movement. The stability of the proposed system was validated using transfer function test to ensure its capability. The Ziegler-Nichols technique was implemented to determine the adjustment mechanism. The adjustment mechanism will minimise the error of the reactor power to zero. The value of adjustment mechanism was determined by measuring the delay time and time constant from the operation data. The stability of controller has been checked using Lyapunov stability derivation. Results from the conventional MRAC and modified MRAC were compared and analysed. The percentage of improvement in terms of settling time was 33%, rise time was 33%, and there were no changes of for steady state error and tracking error. In conclusion, the modified MRAC had performed well in transient response, with settling time of 123.36 sec and rise time of 93.76 sec, which are applicable for a nuclear reactor power control system
Regenerative braking model for electric vehicles with modified super-twisting sliding mode control
Get PDFAs global warming comes and the prices of fuel keep rising, the clean and environmental friendly features of electric vehicles are increasingly focused. The electric vehicle is ideally compatible with the existing situation due to its efficiency compared to the Internal Combustion Engine (ICE). For full electric vehicles, the battery is the only source of energy, and the battery faces issues such as longer
charging period. In general, Battery Electric Vehicle (BEV) has limited driving range due to battery capacity storage. The regenerative braking system (RBS) became important for electric vehicles that could allow motor vehicles function
as a generator and alternator for the recovery process of kinetic energy during a
braking event.
During regenerative braking, the kinetic energy produced by the engine during
deceleration and the energy needs to be recycled to extend driving range. The energy will be transmitted to charge the battery or store it in the energy storage. If the braking force distribution is not adequately regulated, the controller might fail to generate the necessary braking torque. In reality, the battery pack will cause harm due to overcharging induced by uncontrolled recovery. Appropriate braking system are required to be established in order to optimise the energy transferred during the regenerative braking process.
The presence of classical regenerative braking is to optimise the regeneration of kinetic energy by reconciling regenerative technology with braking efficiency and vehicle behaviour. However, the existing result is insufficient where only 1056.6 kJ per cycle for the Urban Dynamometer Driving Schedule (UDDS) and 4599 kJ per cycle for New European Driving Cycle (NEDC). This research introduced new topology of Integrated Regenerative Braking Force Distribution (IBFD) for
optimum braking and vehicle stability by combining average speed distribution
of the braking force with National Renewable Energy Laboratory (NREL) braking design. The average speed level for the urban driving cycle in Malaysia is 31.89
km/h. The average braking force is used to optimise the default braking distribution mechanism.
This research verify conventional Sliding Mode Control Super-Twisting (SMCST) controller because it is useful due to it robustness against the disturbances and uncertainties. Even though the conventional SMCST controller confirms the stability, nevertheless it gives unsatisfied performance to obtain the desired State of Charge (SoC). Thus, the modified Sliding Mode Control Super-Twisting with
hybrid fuzzy-gain scheduling optimisation component was proposed. The proportional gain was added to the switching control for faster response to the
desired sliding surface. The modified SMCST is pairing with IBFD. Based on the results for NEDC, driving cycle using modified SMCST with IBFD braking, the energy transmitted is 600 kJ more than NREL, average motor efficiency increase to 0.85, overall efficiency 2.799 and the SoC is 0.899. The slip ratio output at 32
km/h deceleration is -0.19 that proved the stability of this topology. The proposed
methodologies successfully integrate the regenerative and friction braking forces
to achieve the control goal
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
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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