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All Journal Desimal: Jurnal Matematika Jurnal Hutan Tropika
Setiarno, Setiarno
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Agriculture, Biological Sciences & Forestry Education Mathematics Social Sciences

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Machine learning survival analysis on couple time-to-divorce data Putera, Muhammad Luthfi Setiarno; Setiarno, Setiarno
Desimal: Jurnal Matematika Vol. 5 No. 3 (2022): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v5i3.13742

Abstract

Marriage life does not always last harmoniously and occasionally can lead to divorce. The trend for the last three years since 2019 shows that divorce cases in Palangka Raya occur with a fluctuating trend that has recently been increasing. This research used a machine learning method called Survival Support Vector Machine on the divorce dataset in Palangka Raya. This research developed a feature selection technique using backward elimination to determine the factors influencing the couple’s decision to have their divorce registered in the religious court. The backward elimination method yielded the variables contributing to divorce: the number of children, the defendant's occupation, the plaintiff's age at marriage, the cause of divorce, and the defendant's education. Based on the comparison of the survival model performance between the Cox proportional hazard and the Survival Support Vector Machine, it was found that the latter was better since it had a higher concordance index and hazard ratio, which were 61.24 and 0.54, respectively. Thus, 61.24% of divorce cases were classified precisely by SUR-SVM in terms of the time sequence of events. Moreover, the hazard ratio of 0.54 indicated that the divorce rate of couples with censored status was 0.54 times than that of couples with failed/endpoint status.
Keanekaragaman Jenis Tumbuhan dan Status Konservasi Tumbuhan di Kebun Raya Katingan : Plant Species Diversity and Conservation Status in Katingan Botanical Garden Setiarno, Setiarno; Sari , Nurmila; Sosilawaty, Sosilawaty; Hidayat, Nisfiatul; Junaedi, Ajun
HUTAN TROPIKA Vol 18 No 2 (2023): Volume 18 Nomor 2 Tahun 2023
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v18i2.12013

Abstract

The existence of the Katingan Botanical Garden which will collect various plants (fruits, orchids, and various types of forest vegetation typical of Kalimantan) will be utilized and developed for research, education, cultivation, conservation, tourism, and environmental services. This study aims to analyze the diversity and reveal the rarity status of plant species in the Katingan Botanical Garden area, Katingan Regency, Central Kalimantan Province. The method used to collect vegetation data is the plot method in the form of quadratic transects. The size of the observation plot transect is 20 m x 500 m with 2 (two) transects. The research object is seedling, sapling, pole, and tree-stage vegetation. The composition of vegetation species found in the community unit (2,0 ha) is 28 species belonging to 17 tribes, in this, there are 2 individuals that have not been identified. Akasia (Acacia mangium), Tumih (Cambretocarpus rotundatus), and Gerunggang (Cratoxylum arborescent BI.) dominated at all growth stages. The biodiversity indices (diversity, richness, and evenness indices) are classified as medium, low, and high, respectively. There are 3 (three) plant species classified as IUCN status, namely Pulai (Alstonia scholaris) with Least Concern (LC) or low-risk criteria, Jelutung (Dyera lowii) with Vulnerable (VU) or vulnerable criteria, Kempas (Koompassia malaccensis) with Vulnerable (VU) or vulnerable criteria, and 1 (one) plant species including protected, namely Kempas (Koompassia malaccensis).
Struktur Komunitas Vegetasi Pada Blok Perlindungan di Kawasan Taman Hutan Raya Lapak Jaru Kabupaten Gunung Mas: Vegetation Community Structure in Protection Block in The Lapak Jaru Highway Forest Park Area Gunung Mas District Setiarno, Setiarno; Sopya, Sopya; Tanduh, Yusinta; Junaedi, Ajun; Yulianti, Reri
HUTAN TROPIKA Vol 19 No 1 (2024): Volume 19 Nomor 1 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i1.14243

Abstract

Botanical Forest Park (Tahura) is very important to support human life and the environment. The purpose of the study was to analyze the structure of the vegetation community, including the level of diversity, and the similarity of the vegetation community. The research method follows the sampling technique procedure with the plot method. Data were analyzed using the Index of Important Value to test the mastery of the species, the Shannon-Wiener Index to test the level of diversity of vegetation species, and community stability, community similarity index to test the similarity between flora communities. The results obtained are the value of the species diversity index, in general, is included in the medium category, which means that productivity is sufficient, ecosystem conditions are quite balanced, and ecological pressure is moderate. The species evenness index is high, the species richness index is in the medium category, and the similarity index between plant communities is very high.
Sifat Fisika Dan Mekanika Papan Partikel Dari Kayu Durian (Durio zibethinus Murr): The Physical and Mechanical Properties of Particle Board from Durian Wood (Durio zibethinus Murr) Indrayanti, Lies; Siska, Grace; Wahyudi, Wahyudi; Setiarno, Setiarno; Sianipar, L.
HUTAN TROPIKA Vol 19 No 1 (2024): Volume 19 Nomor 1 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i1.14275

Abstract

The studi aimed to determine the characteristics particle board of Durian Wood. The material used durian wood which is no longer productive. The adhesive used is PVAc adhesive. The research method used a Completely Randomized Design with a single factor, namely particle size with 3 levels, namely 4.5 and 6 mesh. The parameters tested, namely the physical and mechanical properties of the board, refer to the SNI 03-2105-2006 standard. The results showed that the average water content ranged from 16.94–17.25%, density 0.134–0.145 g.cm-3, water absorption capacity 2.09– 2.50%, thickness expansion 10.93–15.25% , while MoE 65629.90-79209.38 kgf.cm-2, MoR 267.86 – 431.33 kgf.cm-2, internal bond strength 0.08–0.15 kgf.cm-2, Screw holding strength 0.021 –0.035 kgf. Thickness development at the 5 mesh level, Modulus of Elasticity (MoE), and Modulus of Ropture (MoR) have met the SNI 04-2105-2006 standards, while the water content, density, water absorption capacity, internal adhesive strength and Screw holding strength still do not meet the standards set. The highest MoE reached 125,000 kgf.cm-2 and MoR reached 643 kgf.cm-2. The results of mechanical tests show that particle board of durian wood has the potential to be used as interiors construction.
Komposisi Vegetasi, Keanekaragaman Jenis, Dan Pola Dispersi Tumbuhan Langka Pada Kawasan Laboratorium Alam Lahan Gambut Universitas Palangka Raya: The composition of vegetation, species diversity, and dispersion patterns of rare plants in the Natural Peatland Laboratory Area of the University of Palangka Raya Setiarno, Setiarno; Nababan, Suzet Rotua Tasya; Hidayat, Nisfiatul; Rotinsulu, Johanna Maria; Junaedi, Ajun
HUTAN TROPIKA Vol 20 No 1 (2025): Volume 20 Nomor 1 Tahun 2025
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v20i1.20219

Abstract

This research aims to describe and analyze species composition, species diversity, and dispersion patterns of rare plants, particularly those classified as critically endangered, in the Natural Laboratory of Peatland Palangka Raya University. Vegetation data collection was conducted using the quadrat plot technique based on a purposive systematic sampling. The data in the research plots were analyzed using Microsoft Excel, referring to the Important Value Index (IVI), species dominance index, diversity index, evenness index, and dispersion index. This research identified 47 types of plants (the total number of plants at the seedling, sapling, pole, and tree levels) categorized into 38 genera and 27 families. There were rare plants fall into critically endangered or endangered, namely ramin (Gonystylus bancanus) and nyatoh (Palaquium bintuluense). Nyatoh (Palaquium bintuluense), jambu-jambu (Eugenia spp.), and mangkinang (Elaeocarpus stipularis BI.) were almost always among the top five dominant species from the seedling stage to the tree stage at various peat thickness levels, but there was no concentration of species dominance in the plot. The majority of the species diversity index values (Shannon-Wiener) in the plots were classified as high (H’>3), indicating that the forest ecosystem conditions at the location are relatively stable. The evenness index of species in all plant communities and peat thickness levels fell into almost uniform abundance category (E = 0.76 – 0.95). The dispersion pattern of the population of critically endangered rare plants, such as Gonystylus bancanus (Mig.) and Palquium bintulense, at various peat thickness levels was clustered. In terms of growth stages, the population of Palquium bintulense was entirely clustered, while that of Gonystylus bancanus (Mig.) was only clustered at the sapling stage, but at the seedling and pole stages, it had random pattern.
Co-Authors Hidayat, Nisfiatul Indrayanti, Lies Johanna Maria Rotinsulu Junaedi, Ajun Nababan, Suzet Rotua Tasya Putera, Muhammad Luthfi Setiarno Sari , Nurmila Sianipar, L. Siska, Grace Sopya, Sopya Sosilawaty, Sosilawaty Tanduh, Yusinta Wahyudi Wahyudi Yulianti, Reri