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 dengan Tesaurus dan Pendekatan Boolean
Abstrak: This research implements and evaluates the implementation of automatic query expansion with synonyms and antonyms derived from thesaurus with boolean approach. The research was conducted because query expansion in the previous research by Pancawan using intersection weight required a long time. This research used 2095 documents and 30 queries. Using one synonym produced the best performance with an average F1 of 0.06376 in average time of query expansion 5.256 seconds, while the previous research produced an average F1 of 0.06385 in 23.451 seconds. Using one antonym on this and previous research produced the same average F1 of 0.06651. However, the average time required for the query expansion in this research was 1.916 seconds, only half of the previous research that took 4.890 seconds. From the evaluation result of the document retrieval comparison, this research obtained a similar performance in less time.
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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