Judul: Perancangan Usability Sistem Visualisasi Keterkaitan Subjek Tesis Berbasis Web
Abstrak: Visualisasi data dengan beragam keunggulannya dapat menjadi solusi untuk memperoleh putusan informasi lebih cepat yang kerap kali dituntut pada institusi pendidikan. Penerapan teknik visualisasi data telah dilakukan terhadap data keterkaitan subjek karya ilmiah pada data tesis perpustakaan Institut Pertanian Bogor (IPB) melalui sistem Subject Term Relationship Visualization (STRV). Unsur interaksi manusia dan komputer dalam sistem tersebut belum diterapkan. Penelitian ini bertujuan meningkatkan unsur tersebut terutama komponen learnability dan memorable dengan membuat prototipe sistem melalui pendekatan user experience. Metode yang digunakan dalam penelitian ini adalah metode Wilson. Hasil yang diperoleh melalui penelitian ini adalah prototipe medium fidelity sebagai saran perbaikan sistem agar pengguna dapat mencapai tujuannya dengan lebih mudah. Evaluasi dilakukan dengan menggunakan menjawab 16 pernyataan visualization-specific heuristic evaluation. Hasil pengujian menunjukkan bahwa prototipe sistem telah berhasil meningkatkan komponen learnability dan memorable pada sistem.
Keyword: keterkaitan subjek, user experience, sistem visualisasi

Judul: Visualisasi dan Navigasi Semantik pada Subjek Tesis IPB Menggunakan Peluang Bersyarat
Abstrak: Searching and browsing research documents, such as thesis, using subject terms in document is an effective way to obtain information about existing research in IPB. These two tasks results will be more interactive when a visualization module is added. This research aims to build a document browsing system based on subjects of the IPB’s thesis metadata and to visualize the relations among subject terms. Subject terms are stemmed using the Porter Stemmer algorithm and the list of subject term are created using the thresholding technique. Analysis on threshold values is performed to determine the threshold level which gives efficient computation time and the optimal number of subject terms. The experimental results show that the threshold value of 4 provides the computation time of 334 seconds and results in 381 subject terms. Furthermore, the probabilities of subject terms are calculated using the conditional probability formula and a visualization module is designed.
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Judul: Insecticidal Activity of Essential Oils Leaves of Cinnamomum spp. (Lauraceae) against Crocidolomia pavonana and Their Phytotoxicity on Broccoli Seedlings
Abstrak: Essential oils from leaves of 13 species of Cinnamomum were tested for their insecticidal activity on the cabbage head caterpillar Crocidolomia pavonana with leaf immerse method. The results showed that the treatment with 1% (w/v) essential oils leaves of C. celebicum, C. multiflorum, C. sintoc, and C. verum caused 21.45, 93.65, 60.30, and 76.10% mortality, respectively. Based on the results of phytotoxicity and insecticidal activity tests, C. multiflorum oil was further tested at 6 concentration levels. In all treatments, larval mortality has occurred at 24 hours after treatment (HAT) and increased at 48 HAT. LC50 of C. multiflorum oil at 24 and 48 HAT was 0.504 and 0.396%, respectively. The treatment with C. multiflorum oil at ≤0.31% did not inhibit the development of C. pavonana larvae. Determination of the chemical constituents of Cinnamomum oils were carried out by gas chromatography-mass spectrometry (GCMS). Totally, 345 compounds were identified. Methyleugenol constituted the main component (49.4%) of leaf essential oil of C. multiflorum and was assumed to be responsible for the insecticidal activity of the oil against C. pavonana larvae. LC50 of pure methyleugenol obtained at 0.365% (48 HAT) and 0.363% (72 HAT). The results showed that C. multiflorum was more effective with LC50 value equivalent to methyleugenol content of 0.32% (24 HAT) and 0.24% (48 HAT).
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