Judul: Ekspansi Kueri pada Sistem Temu Kembali Informasi dengan Tesaurus dan Bobot Irisan
Abstrak: Query expansion is a technique to change the intial query from user in order to improve and optimize result of a retrieval system by getting more relevant documents. Thesaurus is a collection of synonyms and antonyms that can be utilized to get additional terms in query expansion. We propose a method to choose additional terms for query expansion based on insersection betweeen results from original query and results from expanded query. We experiment with synonyms and antonyms using 2095 documents and 20 queries that we made for this research. To make these queries, we use words that are generally different from the words that are contained in the document collection. The result of this research shows that the use of query expansion can improve the performance of the retrieval system in getting more relevant documents. It also shows that the use of two synonym terms result in the best query expansion, retrieving 98.1% relevant documents with an average precision of 0.252, while the use of an antonym is only able to retrieve 86.9% relevant documents with an average precision of 0.173.
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Judul: Ekspansi Kueri pada Sistem Temu Kembali Informasi Berbahasa Indonesia Menggunakan Thesaurus
Abstrak: Query expansion is a common technique for fixed query in order to yield a better information retrieval result. Using a thesaurus is a way for fixed query. Thesaurus is a dictionary of words and terms which are collected and filtered by correlation of meaning of the word, like synonim, antonim, hyponim, and hypernim. This research is intended to analyze the effectivity of query expansion using thesaurus Global Analysis Method. There are a thousand agricultural documents and 93 medical plants documents. The research used Tf-Idf as a weighting method. The result of system performance which were used in this research is good with average precision of 53% for agricultural document and 76% for medical plants document using thesaurus query expansion. The maximal result that the thesaurus could gain is by using two-word length query. Query expansion method using thesaurus has a better result than the one using 2-language dictionary and pseudo relevance feedback document segmentation. The query length and the taking of some number of word group in thesaurus will affect the result of information retrieval.
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Judul: Kandungan Logam Berat Hg, Cd, Pb, dan Cu pada Ikan Bandeng Chanos chanos (Forsskal, 1775) di Perairan Bojonegara, Teluk Banten
Abstrak: Perairan Bojonegara sebagai bagian dari Teluk Banten, merupakan perairan yang mendapat pengaruh dari aktivitas industri, perkapalan, dan domestik. Aktivitas tersebut dapat menimbulkan pencemaran berupa logam berat. Penelitian ini bertujuan untuk menentukan tingkat akumulasi logam berat (Hg, Cd, Pb, dan Cu) pada daging ikan bandeng serta menentukan batas aman dalam mengkonsumsi ikan bandeng (Chanos chanos) di perairan Bojonegara, Teluk Banten. Pengambilan contoh ikan dan pengamatan perairan dilaksanakan dari bulan Agustus hingga Oktober 2020. Pengukuran kandungan logam berat pada daging ikan dilakukan dengan menggunakan AAS (Atomic Absorption Spectrophotometer). Kandungan logam berat Hg, Cd, dan Pb masih berada dibawah limit deteksi alat AAS dan masih berada di bawah baku mutu. Kandungan logam Cu pada ikan bandeng ukuran besar berkisar antara 2,87- 16,87 mg/kg, sedangkan ukuran kecil berkisar antara 0,273-0,481 mg/kg. Kandungan logam Cu pada ikan bandeng ukuran kecil masih berada di bawah baku mutu, sedangkan ikan bandeng ukuran besar telah melebihi baku mutu yang telah ditetapkan. Akumulasi logam Hg, Cd, dan Pb pada ikan bandeng tergolong akumulasi rendah, sedangkan akumulasi logam Cu tergolong akumulasi rendah hingga tinggi. Kandungan logam berat Hg, Cd, Pb, dan Cu terhadap ukuran ikan besar dan kecil tidak berbeda nyata., Bojonegara waters as part of Banten Bay, are waters that are affected by industrial, shipping and domestic activities. These activities can cause pollution in the form of heavy metals. This study aims to determine the level of accumulation of heavy metal (Hg, Cd, Pb, and Cu) in milkfish meat and determine the safe limit for consuming milkfish (Chanos chanos) in Bojonegara waters. Measurement of heavy metals content in fish meat was carried out using AAS (Atomic Absorption Spectrophotometer). The content of heavy metals Hg, Cd, and Pb is still below the detection of the AAS tool and is still below the quality standard. The content of Cu metal in large milkfish ranges from 2,87-16,87 mg/kg, while the small size ranges from 0,273-0,481 mg/kg .The content of Cu metal in small milkfish is still below the quality standard, while large milkfish has exceeded the established quality standard. The accumulation of Hg, Cd, and Pb in milkfish is classified as low accumulation, while the accumulation of Cu metal is classified as low to high accumulation. The content of heavy metals Hg, Cd, Pb, and Cu on the size of the large and small fish is not significantly different.
Keyword: Banten Bay, Bojonegara waters, heavy metals