Judul: Habitat Characteristics, Population and Distribution of Belitung Tarsier (Cephalopachus bancanus saltator Elliot 1910) in Bukit Peramun Area, Belitung
Abstrak: Tarsius belitung (Cephalopachus bancanus saltator Elliot 1910) merupakan salah satu subspesies dari Western tarsier yang hanya tersebar di Pulau Belitung. Satwa tersebut termasuk ke dalam daftar Appendix II CITES dan kategori Endangered menurut IUCN Redlist. Penelitian ini bertujuan untuk menganalisis karakteristik habitat, populasi dan sebaran tarsius belitung di Kawasan Bukit Peramun. Penelitian dilakukan dengan metode consentration count dan analisis vegetasi. Habitat tarsius belitung adalah hutan sekunder dengan ketinggian 110 – 150 mdpl dan kelerengan 0 – 8,33%. Spesies vegetasi sebagai pohon tidur tarsius adalah pancang seruk (Schima wallichii) dan pelepak (Hydnocarpus sp.). Ular dan burung hantu serak bukit (Phodilus badius) adalah predator tarsius, sedangkan kompetitornya adalah tokek (Gekko gecko). Potensi serangga sebagai pakan tarsius adalah jangkrik, belalang, ngengat, kupu-kupu, semut, laba-laba, kumbang, dan capung. Populasi terbanyak dari tarsius belitung adalah 13 individu, kepadatan 0,536 individu/ha atau 53,6 individu/km2 dengan nisbah kelamin 0,71 : 1. Sebaran tarsius belitung banyak terdapat di Hutan sekunder karena ketersediaan sumberdaya yang melimpah dan kelerengan yang landai menyebabkan sedikitnya jumlah predator di areal tersebut., Belitung tarsier (Cephalopachus bancanus saltator Elliot 1910) is one of the subspecies of Western tarsier which is only spread on Belitung Island. The animal is included in the CITES Appendix II list and the Endangered category according to the IUCN Redlist. This study aims to analyze the characteristics of the habitat, population and distribution of the Belitung tarsier in the Bukit Peramun area. The study was conducted using the method of concentration count and vegetation analysis. Belitung tarsier habitat is secondary forest with an altitude of 110 – 150 mdpl and a slope of 0 – 8,33%. Vegetation species as tarsiers sleeping trees are seruk (Schima wallichii) and pelpaks (Hydnocarpus sp.). Snakes and hill husky owls (Phodilus badius) are tarsier predators, while their competitors are geckos(Gekko gecko). Potential insects asfood for tarsier are crickets, grasshoppers, moths, butterflies, ants, spiders, beetles, and dragonflies. The largest population of belitung tarsier is 13 individuals, density is 0,536 individuals/ha or 53,6 individuals/km2 with sex ratio 0,71 : 1. The distribution of belitung tarsier is widely found in secondary forest due to the availability of abundant resources and gentle slopes causing the small number of predators in the area.
Keyword: belitung tarsier, bukit peramun area, distribution, habitat characteristics, population

Judul: Population and Distribution of Tarsier ( Cephalopachus bancanus borneanus Elliot 1910) at Resort Pondok Ambung, Tanjung Puting National Park
Abstrak: Tarsius kalimantan (Cephalopachus bancanus borneanus) merupakan salah satu subspesies dari Cephalopachus yang hanya tersebar di Pulau Kalimantan. Satwa tersebut termasuk kategori vulnerable menurut IUCN redlist. Perlindungan terhadap C.b. borneanus telah ditetapkan pada Permen LHK No. P.106 Tahun 2018 sebagai jenis satwa yang dilindungi. Penelitian ini bertujuan untuk menganalisis populasi dan distribusi tarsius kalimantan di Resort Pondok Ambung, Taman Nasional Tanjung Puting. Penelitian dilakukan dengan metode eksplorasi dan consentration count sebanyak sepuluh kali serta penandaan titik pada setiap perjumpaannya. Data perjumpaan satwa dianalisis menggunakan software ArcGis 10.8 dan software MaxEnt v3.3.4k untuk membuat model distribusi spasial tarsius kalimantan. Populasi terbanyak tarsius kalimantan yang didapatkan sebanyak 6 individu, kepadatan 0,097 individu/ha atau 9,7 individu/km² dengan nisbah kelamin 1 - 0,66. Akurasi kinerja model prediksi menggunakan MaxEnt menunjukkan angka 0.876 yang artinya baik. Peta prediksi pada pemodelan MaxEnt menunjukkan bahwa lokasi penelitian merupakan area penting untuk pelestarian tarsius kalimantan. Variabel lingkungan yang paling berpengaruh adalah ketinggian dan NDVI (Normalized Difference Vegetation Index). Pohon yang dimanfaatkan sebagai habitat tarsius di area penelitian adalah puspa (Schima walichii). Kategori strata tertinggi habitat tarsius kalimantan di Resort Pondok Ambung umumnya berada pada stratum C., The Kalimantan tarsier (Cephalopachus bancanus borneanus) is one of the subspecies of Cephalopachus which is only found on the island of Borneo. This animal is categorized as vulnerable according to the IUCN redlist. Protection against C.b. borneanus has been stipulated in Permen LHK No. P.106 of 2018 as a protected animal species. This study aims to analyze the population and distribution of the Kalimantan tarsiers at Pondok Ambung Resort, Tanjung Puting National Park. The research was carried out using the method of exploration and concentration, counting ten times as well as marking points at each encounter. To create a spatial distribution model for the Kalimantan tarsiers, data from animal encounters was analyzed using ArcGis 10.8 software and MaxEnt v3.3.4k software. The largest population of Kalimantan tarsiers obtained was 6 individuals, with a density of 0.097 individuals/ha or 9.7 individuals/km2 with sex ratio of 1: 0.66. The performance accuracy of the prediction model using MaxEnt shows a number of 0.876, which means it is good. The prediction map of MaxEnt's modeling shows that the research location is an important area for the preservation of the Kalimantan tarsiers. The most influential environmental variables are altitude and NDVI (Normalized Difference Vegetation Index). The tree used as a habitat for tarsiers in the research area is puspa (Schima walichii). The highest strata category of the Kalimantan tarsier habitat at Pondok Ambung Resort is generally in stratum C.
Keyword: Kalimantan tarsier, Maximum entropy, Pondok Ambung Resort, Population

Judul: Model Input-output dalam Masalah Network Flow
Abstrak: Production process is a process, which is done by industry, to transform input into output. According to the type of output and its activity, industry can be classified into various sectors, which are connected to each other. Therefore, a model to analyze the connection among sections is needed. The model is known as input-output model (IO model). IO model presents an IO table, which shows informations about the transaction between goods and services in each economic sector. Furthermore, the IO model also shows that the amount of all input is the same as the amount of all output. In this paper, the transaction of each economic sector in IO table is analyzed using network flow theory. The formulated network flow problem implies that each sector represents partly as a producer and also as a consumer. This paper also solves a minimum cost circulation problem.
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