14 research outputs found
Building data warehouses in the era of big data: an approach for scalable and flexible big data warehouses
During the last few years, the concept of Big Data Warehousing gained significant attention from the scientific community, highlighting the need to make design changes to the traditional Data Warehouse (DW) due to its limitations, in order to achieve new characteristics relevant in Big Data contexts (e.g., scalability on commodity hardware, real-time performance, and flexible storage). The state-of-the-art in Big Data Warehousing reflects the young age of the concept, as well as ambiguity and the lack of common approaches to build Big Data Warehouses (BDWs). Consequently, an approach to design and implement these complex systems is of major relevance to business analytics researchers and practitioners. In this tutorial, the design and implementation of BDWs is targeted, in order to present a general approach that researchers and practitioners can follow in their Big Data Warehousing projects, exploring several demonstration cases focusing on system design and data modelling examples in areas like smart cities, retail, finance, manufacturing, among others
PENGARUH PENAMBAHAN LENSA NOZZLE DAN JUMLAH BLADE AIRFOIL TIPE NACA 4415 TERHADAP HASIL DAYA LISTRIK TURBIN ANGIN SUMBU HORISONTAL
Danur Lambang Pristiandaru. PENGARUH PENAMBAHAN LENSA NOZZLE
TURBIN ANGIN DAN JUMLAH BLADE AIRFOIL TIPE NACA 4415
TERHADAP HASIL DAYA LISTRIK. Skripsi, Fakultas Keguruan dan Ilmu
Pendidikan Universitas Sebelas Maret Surakarta. Januari 2016
Tujuan penelitian ini adalah: (1) Menyelidiki pengaruh jumlah blade pada
turbin angin non-twisted blade tipe airfoil NACA 4415 terhadap daya listrik yang
dihasilkan. (2) Menyelidiki pengaruh penambahan lensa nozzle pada turbin angin
non-twisted blade tipe airfoil NACA 4415 terhadap daya listrik yang dihasilkan
turbin angin. (3) Menyelidiki pengaruh bersama (interaksi) antara penambahan
lensa nozzle dan jumlah blade terhadap daya listrik yang dihasilkan turbin angin.
Penelitian ini menggunakan metode deskriptif kuantitatif. Sampel dalam
penelitian ini adalah Turbin Angin Sumbu Horisontal (TASH) dengan desain blade
airfoil NACA 4415 non-twisted. 3 desain lensa nozzle digunakan untuk mengetahui
pengaruhnya terhadap peningkatan daya listrik TASH. Terdapat 3 variasi jumlah
blade yaitu jumlah blade 2, jumlah blade 3, dan jumlah blade 4. Variasi kecepatan
angin yang digunakan dalam penelitian ini adalah 2,5 m/s, 3,5 m/s, dan 4,5 m/s.
Data diperoleh dengan melakukan pengujian TASH menggunakan angin rekayasa,
daya listrik yang dihasilkan dibaca dan direkam oleh data logger. Data yang
diperoleh dari hasil penelitian dimasukkan ke dalam tabel dan ditampilkan dalam
bentuk grafik, kemudian dianalisis.
Berdasarkan hasil penelitian dapat disimpulkan bahwa: (1) Adanya
pengaruh variasi jumlah blade terhadap daya listrik turbin angin. TASH 3 blade
menghasilkan daya listrik yang paling besar yaitu 0,7222 W pada kecepatan angin
4,5 m/s. (2) Adanya pengaruh penambahan lensa nozzle terhadap turbin angin.
Lensa nozzle mampu meningkatkan hasil daya listrik turbin angin semua jenis
variasi jumlah blade dibandingkan turbin angin tanpa lensa nozzle. (3) Ada
pengaruh bersama yang signifikan antara variasi jumlah blade dan variasi jenis
lensa terhadap daya listrik turbin angin. TASH 3 blade dengan lensa C pada
kecepatan angin 4,5 m/s memiliki daya listrik tertinggi yaitu sebesar 0,82041 W.
Daya listrik tersebut meningkat 13,60% dibanding TASH 3 blade tanpa
penambahan lensa, yaitu 0,7222 W.
Kata kunci: Turbin Angin, Lensa Nozzle, Daya Listrik, Data Logge
Scalability considerations for multivariate graph visualization
Real-world, multivariate datasets are frequently too large to show in their entirety on a visual display. Still, there are many techniques we can employ to show useful partial views-sufficient to support incremental exploration of large graph datasets. In this chapter, we first explore the cognitive and architectural limitations which restrict the amount of visual bandwidth available to multivariate graph visualization approaches. These limitations afford several design approaches, which we systematically explore. Finally, we survey systems and studies that exhibit these design strategies to mitigate these perceptual and architectural limitations
Visualizing and Managing Network Topologies via Rectangular Dualization
Rectangular dualization is an effective, hierarchically oriented visualization method for network topologies and can be used in many other problems having in common with networks the condition that objects and their interoccurring relations are represented by means of a planar graph. However, only 4-connected triangulated planar graphs admit a rectangular dual. In this paper we present a linear time algorithm to optimally construct a rectangular layout for a general class of graphs and we discuss a variety of application fields where this approach represents an helpful support for visualization tools
RECTANGULAR DUALIZATION OF BICONNECTED PLANAR GRAPHS IN LINEAR TIME AND RELATED APPLICATIONS
Although rectangular dualization has been studied for several years in the context of floorplanning problems, its descriptive power has not been fully exploited for graph representation. The main obstacle is that the computation of a rectangular dual of any planar biconnected graph requires a sequence of non-trivial steps, some of which are still under investigation. In particular, the most tricky issue is the optimal management of separating triangles, for which no existing algorithm runs in linear time. In this paper we present our advances in rectangular dualization and we show two applications that, while very different, explain better than others its role
“Il database per la progettazione integrata”.
codice lavoro 703
Virtual institutions for preserving and simulating the culture of Mount Bego's ancient people
The Alps of southeastern France, better known as the Valley of Marvels, hide an impressive collection of engrav-ings, mostly visible on the rocks around Mount Bego, which are irreplaceable witnesses of what life of the people who created them looked like. This calls for immediate action on promoting the awareness of this cultural trea-sure, which is hardly accessible by interested common men, as well as on helping domain experts to analyze these engravings and share their understanding and theories about them with other experts and with the mass. In this position paper, we propose technologies and partially achieved results for preserving in digital form all kinds of available data about the region. The technology will allow domain experts to: (i) organize and structure data into an existing collaborative tool set, (2) process them, (3) make assumptions about the way of life of the ancient people based on them, and (4) make the results of such activities available in form of 3D Virtual Worlds. 1
An antimicrobial molecule mitigates signs of sepsis in vivo and eradicates infections from lung tissue
The peptide sequence KKIRVRLSA was synthesized in a dimeric structure (SET-M33DIM) and evaluated as a candidate drug for infections due to multidrug-resistant (MDR) Gram-negative pathogens. SET-M33DIM showed significant antibacterial activity against MDR strains of Klebsiella pneumoniae, Acinetobacter baumannii, and Escherichia coli (Minimal Inhibitory Concentration [MICs], 1.5-11 µM), and less activity against Pseudomonas aeruginosa (MICs, 11-22 µM). It showed very low toxicity in vitro, ex vivo, and in vivo; in cytotoxicity tests, its EC50 was as much as 22 times better than that of SET-M33, a peptide with the same amino-acid sequence, but synthesized in tetra-branched form (638 vs 28 µM). In in vivo and ex vivo experiments, SET-M33DIM cleared P. aeruginosa infection, significantly reducing signs of sepsis in animals, and restoring cell viability in lung tissue after bacterial challenge. It also quelled inflammation triggered by LPS and live bacterial cells, inhibiting expression of inflammatory mediators in lung tissue, cultured macrophages, and bronchial cells from a cystic fibrosis patient. © 2019 Federation of American Societies for Experimental Biolog