1,721,058 research outputs found
Modelling Energy Balance and Storage in the Design of Smart Microgrids
Full text linkThis paper introduces and demonstrates appropriate and realistic modelling approaches for smart microgrids, with a focus on local energy balance. There is an increasing interest in microgrids, as the nature of large-scale electricity generation and distribution changes, with a conscious shift to more sustainable and renewable energy sources. However, the modelling and design techniques traditionally used have tended to be based on economics and design criteria more suited to the top-down planning for power generation and distribution typical of legacy grids, than to bottom-up energy balance incorporating localised distributed generation and storage, significant characteristics of these new systems. Several aspects of microgrid design and specification are modelled using an example based on an installation incorporating solar photovoltaic panels and battery storage. Important features of each of the models shown are the associated visualisations, which lead to improved understanding of design implications, compromises, and consequences, and the true context of a renewable-energy based microgrid
The effect of group size and communication modes in CSCW environments
Full text linkAn earlier study by M. Masoodian et al. (1995) has examined the impact of different human-to-human communication modes on computer supported work involving groups of two people. Based on the findings of this study an experiment was designed to explore the relative impact of face-to-face and audio-only communication modes in supporting shared-workspace interaction between groups of three people. This paper describes the experiment, and examines its findings with the aim of establishing the relationship between the effectiveness of the various communication modes and the group size
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
Empowering Energy Innovation in the Communities of Aotearoa
Full text linkSince the electricity grid began connecting more and more areas of Aotearoa New Zealand, we have been relying on technology that was fit for purpose for a 1980s future. In the last ten years, the New Zealand power system has seen an increase in non-dispatchable generation and an accelerated rate of electrification, creating supply and demand volatility. Aotearoa New Zealand uses more electricity in homes, cars, factories, and devices than ever, yet the generation currently installed around the country is not increasing at the rate of usage or predicted usage. As a result, the national grid operator, Transpower, runs closer to constraint limits on cold evenings every year, has recently been fined over handling a low-generation event in 2021, and subsequently has been issuing more Customer Advisory Notices (CAN) than ever before.
Through a combination of technology-driven development and energy infrastructure, the energy sector has the potential to find new ways to access more electricity through the use of existing generation, or through infrastructure predicted to exist, in more innovative and efficient ways. While companies are working on specific solutions, many of these are required to have an economic benefit for the company by bringing in revenue, as opposed to providing relief to the communities these companies operate in and have been supported. Technology-driven change should support these communities.
This research focuses on how technology driving change in the energy space can be used more effectively to provide security of supply to communities that have yet to be considered when energy policy was written.
The first phase of this research analysed small-scale and medium-heat processes in a beverage factory with solar panels to understand and show how solar generation can be used to offset a factory’s electricity load from the grid. Case Study One analysed how this approach could reduce demand and reliance on the grid by allowing electricity to go where it is required on cold evenings. A monitoring system was custom created for Chia Sisters as a way to provide a deeper understanding of their electricity and solar usage. The system has been available as an open-source project on GitHub for use by other companies in a similar position to Chia Sisters.
The second phase of this research simulated the electricity storage potential in electric buses by applying Vehicle to Grid technology advancements to school buses in the Wellington region through Case Study Two. This simulation took advantage of stationary school buses, which sit idle during school hours and evenings. Nationally, school buses are changing and are required to become electric in the next decade, with electric school buses expected to be a part of the transport system by 2035.
By combining these two community-centred approaches to improving ex- isting infrastructure, smaller communities have potential to gain generation opportunities through a deployable system that would monitor microgrids and monitoring systems. The theorised Community Energy Management System (CEMS) looks at all the inputs (generation and electric vehicles), usage times, and electricity usage trends in remote, rural, or isolated communities to allow electricity to be used more effectively in our communities. These communities often need to be at the forefront of legislation planning. Such a system shows how supply and demand has the potential to change in communities across New Zealand over time by using a community management system. Approaches such as the CEMS theorised have been seen in emergency climate response situations already in New Zealand, so by applying these more resilient microgrid systems with generation stemming from factory roof solar, storage from school buses, and being used in communities, this overall process could become a crucial part of our energy future
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
Visualize online collocation dictionary with force-directed graph
No full textFor second-language learners, collocational knowledge is very important. Knowing collocational phrases allows learners to speak and write in their targeted language naturally and reduce dramatically side effect of their first language. In order for learners to learn collocations easily, a lot of learning methods have been introduced. Particularly, learning from online-collocational corpus has become popular due to its accessibility and massive database. Although, its current presentation of information is still simple, it can be improved by using optimized representations in order to help users learning.
In this thesis, we represent a suitable way to visualize online collocational dictionary by using graph representation in order to facilitate users’ learning and provide flexible exploration. Animation is also used to increase level of engagement for users. We use force-directed model for the layout, but we develop our own graph component and combine some current algorithms in order to create a proper algorithm for our purposes. The implementation is tested by a small group of participants and the results are promising
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