Judul: Penyusunan Kunci Identifikasi pada Anakan Jenis-jenis Anggota Marga Shorea Roxb. ex Gaertner f.
Abstrak: Tingginya keanekaragaman jenis pohon menjadikan manusia sejak lama memanfaatkan sumberdaya hutan tersebut baik untuk keperluan pangan, sandang, maupun papan. Untuk memudahkan kegiatan pemanfaatan tumbuhan, perlu adanya pengetahuan mengenai pengenalan identitas jenis pohon. Jenis-jenis pohon andalan Indonesia salah satunya berasal dari suku Dipterocarpaceae, yaitu kayu meranti dari marga Shorea. Pengelolaan kawasan hutan penghasil kayu meranti perlu dilakukan agar produktivitas kayu tetap terjaga, salah satunya melalui pengelolaan regenerasi alaminya. Identifikasi jenis dalam tingkat anakan menjadi sangat penting agar tidak terjadi kesalahan pemeliharaan jenis yang tidak diinginkan. Penelitian dilakukan dengan mencatat data morfologi dari 43 jenis Shorea spp. pada fase semai dan pancang yang sudah teridentifikasi hingga nama spesiesnya. Penelitian dilaksanakan mulai bulan Januari hingga April 2019 di Persemaian Kantor Pusat Penelitian dan Pengembangan Hutan, Kota Bogor. Selanjutnya data diolah sehingga dihasilkan kunci identifikasi marga Shorea. Ciri morfologi khusus dari anakan marga Shorea yaitu memiliki pertulangan tersier daun tangga (scalariform veination), ditemukannya kelenjar (gland) yang menyebar pada lamina, terdapat stipule atau daun penumpu, dan mayoritas bentuk petiole yang membengkak (swollen) dan melutut (geniculate).
Keyword: anakan, Dipterocarpaceae, kunci identifikasi, morfologi, Shorea

Judul: Identifikasi jenis shorea menggunakan jaringan syaraf tiruan propagasi balik berdasarkan karakteristik morfologi daun
Abstrak: Dipterocarpaceae is a major timber tree of tropical rain forest. Shorea is a genus of the Dipterocarpaceae family which consists of around 194 species. Species diversity may lead to difficulty in distinguishing species of Shorea of one another. It takes knowledge from an expert in the field of Shorea to be able to identify the types of Shorea. Errors in identifying the type of Shorea wood can lead to inappropriate selection for the final usability. Identifying the type of Shorea carried out on five species of Shorea owned Bogor Botanical Gardens on the basis of morphological characteristics of leaves. The identification was carried out using Backpropagation Neural Network. To obtain the values of each leaf morphological characteristics of Shorea, each sample measurement data collected manually. The values are then processed using Backpropagation Neural Network to get the pattern from the training and the accuracy of the test phase. This research used a total of 50 data from five species of Shorea. The data are divided into five subsets. The fifth subset is used in the training and testing phases and conducted five times. The use of methods Backpropagation neural networks in identifying species Shorea produces an average accuracy of 90%.
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Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
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