Judul: Analisis Pola Jaringan Sosial menggunakan Sociogram pada Mahasiswa Departemen Statistika IPB Tahun Masuk 2010
Abstrak: College world is often associated with independent learning system. Students can choose their friends, who can be trusted to help resolve the problems, as their partner discussion. The social network can be seen from the interaction which students made when choosing their partner. Course managers and lecturers can take policy in improving student’s performance by examining the patterns of the student’s social network. The patterns and structure of the social network can be described by a graph called sociogram. The data was obtained from the questionnaires which was conducted on a group of students. The group was taken from the Department of Statistics students, 2010 academic year. Data was processed using NetDraw software. Based on the result obtained, sociogram discovered some interesting things. One of them is that the most partner discussion was the problem of lecture.
Keyword: sociogram, characteristic, social network analysis

Judul: Preferensi Mahasiswa IPB terhadap Mata Kuliah Metode Statistika Menggunakan Analisis Konjoin (Studi Kasus pada Mahasiswa IPB Program Strata Satu yang Mengambil Mata Kuliah Metode Statistika Menggunakan Analisis Konjoin)
Abstrak: Metode Statistika merupakan salah satu mata kuliah interdept IPB, oleh karena itu, perlu diadakan evaluasi untuk mengetahui preferensi atau keinginan mahasiswa terhadap mata kuliah tersebut. Analisis konjoin merupakan analisis yang dapat digunakan untuk mengetahui preferensi atau keinginan mahasiswa mengenai metode pengajaran untuk Metode Statistika. Kombinasi metode pengajaran disusun menggunakan fraksional faktorial dimana level dari faktor ditentukan berdasarkan survei pendahuluan. Teknik sampling yang digunakan adalah penarikan contoh acak bertahap terhadap mahasiswa yang pernah mengambil mata kuliah Metode Statistika pada tahun akademik 2009/2010. Berdasarkan Nilai relatif penting (NRP) pada hasil analisis konjoin, atribut modul, jumlah mahasiswa dan jam kuliah menempati tiga urutan teratas. Sedangkan, nilai kegunaan taraf (NKT) menunjukkan mahasiswa cenderung lebih menyukai materi sesuai mayor, modul yang terstruktur, dosen yang komunikatif, mahasiswa sebagai pengajar responsi, jumlah mahasiswa <50 satu kelasnya dan jam kuliah antara jam 07.00-12.00.
Keyword: 

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).
Keyword: