Judul: Evaluasi Algoritme Breadth First, Best First, Dan Page Rank Pada Web Crawler
Abstrak: Web crawling is a process by which we gather pages from the web, in order to index them and support a search engine. The objective of crawling is to quickly and efficiently gather as many useful web pages as possible, together with the link structure that interconnects them. The objective of this research is to evaluate Breadth First, Breadth First with Time Constraint, Best First and Page Rank algorithms. The process of collecting web pages consists of the initialization process (keywords and starting URL), inserting a link to the frontier, stoping crawling, take\ing the link from frontier, fetch, parsing and indexing. The focus of web crawler algorithm is determines the next link that will be visited. Based on the precision and opportunity of keywords per algorithm, the result of the evaluation indicates that the page rank algorithm is better than three other algorithms. While based on the complexity of algorithm, the result of the evaluation indicates that the page rank algorithm has higher complexity as compared to three other algorithms. In addition, based on the average fetch time, the result of the evaluation indicates that the best first algorithm is more stable than three other algorithms. Keywords : web crawler, web crawling, breadth first, breadth first with time constraint, best first, page rank, cosine similarity, web crawler evalution, precision values of web crawler, complexity algorithm of web crawler.
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Judul: Sistem Peringkas Teks Otomatis Menggunakan Algoritme Page Rank
Abstrak: With the rapid growth of World Wide Web, a huge amount of information is available and accessible online. People do not have the time to read everything, and yet they have to make critical decisions based on whatever information is available. Automatic text summarization is a technique to assist people in digesting the vast amount of information online. Recently, a number of graph-based approaches, such as PageRank, LexRank, and TextRank, have been suggested for text summarization. Automatic text sllnnnarization is a computerized process of distilling the most important information of a source (or sources) for making a brief version of text(s). This research implements graph-based sunamarization algorithm and similarity using graph-based ranking concept for ranking sentences. The process produces the output in the form of extractive summary that consists of high ranking sentences. The graph-based method applied is PageRank, combined with cosine and content overlap similarity. Evaluation of the summaries uses three human judges and their judgement is compared using kappa measure. The result of our experiment shows that the accuracy of PageRank and cosine similarity is better than PageRank with content overlap similarity. Similarity to title produced the best result than similarity with no title.
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Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4