Judul: Transformasi Koordinat menggunakan Jaringan Syaraf Tiruan Propagasi Balik Resilient (Studi Kasus: Daerah Sumatera Bagian Selatan)
Abstrak: Genuk Datum and World Geodetic System 1984 (WGS’84) are used as geodetic reference frames in Indonesia. To fully utilize the technology of WGS’84, it is necessary to transform twodimensional (2D) coordinate data from Genuk to WGS’84. The four-parameter similarity transformation method is frequently used for 2D coordinate transformation in geodesy. In this study, Resilient Backpropagation (Rprop) model is evaluated as an alternative 2D coordinate transformation method. Rprop is compared with four-parameter similarity transformation over a test area in terms of mean square error. The result indicates that the employment of Rprop transformed 2D coordinate (x, y) is more accurate than four-parameter similarity transformation and can be useful for 2D coordinate transformation between Genuk and WGS’84.
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Judul: Transformasi Koordinat Menggunakan Jaringan Syaraf Tiruan Propagasi Balik Levenberg-Marquardt (Studi Kasus: Daerah Jawa Bagian Timur)
Abstrak: Indonesia has used several local datums as ellipsoid geometry reference, one of which is Genuk datum, which uses Bessel Ellipsoid 1841 model. Later, Indonesia chose DGN-95 datum as the national standard datum, which uses WGS-84 ellipsoid reference. It means coordinate points which use Genuk datum before must be transformed into WGS-84. One of the methods to transform coordinates is by using similiarity transformation. This research is aimed to find an alternative method for coordinate transformation using Levenberg-Mardquardt Backpropagation. Data used in this research are coordinates of East Java, which are transformed from Genuk datum into WGS84 datum using similarity transformation and Levenberg-Mardquardt algorithm. MSE values from each method are compared, and the result shows that Levenberg-Mardquardt algorithm can be used as an alternative model for coordinate transform.
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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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