1,720,958 research outputs found
Perancangan Kontrol Optimal Adaptif Melalui Observer Beban Pada Sistem Pembangkit Tenaga Listrik Mesin Tunggal Yang Ter-Interkoneksi
Full text linkPerbaikan performansi sistem dinamik pembangkit tenaga listrik dikarenakan
terjadi suatu gangguan atau perubahan beban yang mengakibatkan (frekuensi dan
tegangan) sistem menjadi tidak stabil yang berarti kehilangan sinkronisasi sistem. Untuk
memperbaiki respons sistem dinamik tersebut digunakan metode pendekatan kontrol
optimal dengan solusi meminimumkan kriteria indeks performansi kuadratik berbasis
observer beban.
Dalam tesis ini akan diajukan metode Kontrol Optimal Adaptif Berbasis Observer
Beban dengan harapan sistem akan bekerja optimal dalam arti sistem mampu
dipertahankan stabil dan beradaptasi pada perubahan beban yang selalu ber-osilasi.
Dari simulasi dengan menerapkan kontrol optimal terlihat bahwa setelah diberi
input gangguan yang sifatnya deteministik, sistem mengalami perbaikan respons menuju
ke keadaan mantap (steady state) pada range yang diijinkan
Analisis Pembagian Beban Generator Unit PLTD Desa Tana Merah Kabupaten Tana Tidung Provinsi Kalimantan Utara
Full text link: Unit Layanan (ULD) desa Tana Merah, kabupaten Tana Tidung, Kalimantan Utara merupakan salah satu unit PT. PLN sistem Mahakam, Kalimantan Timur. Saat ini terdiri atas 3 unit pembangkit, yakni 2 unit PLTD dan 1 unit PLTMG. Penelitian ini menganalisa sistem pembebanan dari 2 unit PLTD yang beroperasi sebagai cadangan daya listrik ke pelanggan. Jika terjadi peningkatan kapasitas beban sedangkan PLTMG tidak mampu memikulnya atau karena bermasalah di sistem pembangkitan, maka PLTD Tana Merah akan beroperasi untuk meningkatkan kapasitas pembangkitan dan menjaga kehandalan sistem. Sistem paralel unit generator PLTD dilakukan secara manual dengan metode zero meter. Teknik pensaklaran tegangan nol ini sebagai alat indikator pengaturan parameter keluaran generator melalui penyesuaian tegangan running, pengaturan frekuensi dengan mengatur speed kontrol governor untuk menyesuaikan masukan bahan bakar. Setelah dilakukan analisa pembagian beban pada setiap generator maka beban listrik yang harus dipikul setiap generator sebesar 0,263 MW dari kapasitas mampu generator sebesar 0,36 MW atau setara dengan 73 persen daya mampu generator
Applying of Double Seasonal ARIMA Model for Electrical Power Demand Forecasting at PT. PLN Gresik Indonesia
Get PDFThe prediction of the use of electric power is very important to maintain a balance between the supply and demand of electric power in the power generation system. Due to a fluctuating of electrical power demand in the electricity load center, an accurate forecasting method is required to maintain the efficiency and reliability of power generation system continuously. Such conditions greatly affect the dynamic stability of power generation systems. The objective of this research is to propose Double Seasonal Autoregressive Integrated Moving Average (DSARIMA) to predict electricity load. Half hourly load data for of three years period at PT. PLN Gresik Indonesia power plant unit are used as case study. The parameters of DSARIMA model are estimated by using least squares method. The result shows that the best model to predict these data is subset DSARIMA with order with MAPE about 2.06%. Thus, future research could be done by using these predictive results as models of optimal control parameters on the power system side
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
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
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