Judul: Study of Ecological Function of Plants and
Aesthetics in Open Areas of Two Office Buildings in South Jakarta
Abstrak: Ruang terbuka hijau di gedung perkantoran memiliki peran yang sangat penting karena keberadaannya berkaitan dengan aspek fungsi ekologis dan estetika kawasan. Namun, masih banyak RTH perkantoran di Jakarta yang pemanfaatannya belum maksimal. Penelitian ini bertujuan mengidentifikasi kondisi eksisting, menganalisis kenyamanan termal, audial, dan estetika di area sekitar Gedung TMT dan Sopo Del Tower berdasarkan pengukuran iklim mikro persepsi dan preferensi. Metode analisis yang digunakan di antaranya Key Performance Index, Temperature Humidity Index, Scenic Beauty Estimation, dan analisis statistik deskriptif dari persepsi dan preferensi pengguna. Hasil penelitian menunjukkan jumlah individu dan spesies pohon lebih banyak di Gedung TMT. Penilaian tanaman dalam fungsi modifikasi suhu, kontrol kelembapan udara, penahan angin, dan peredam kebisingan pada kedua lokasi termasuk dalam kategori sedang. Hasil perhitungan THI menunjukkan bahwa area terbuka Gedung TMT belum memenuhi kenyamanan termal yang ideal. Hasil penilaian untuk kualitas estetika lanskap Sopo Del Tower lebih tinggi dibandingkan dengan lanskap Gedung TMT. Responden cukup puas dengan kondisi eksisting kedua lokasi, namun masih perlu ada perbaikan dan penambahan fasilitas pada beberapa titik lokasi. Responden menyarankan adanya pemeliharaan yang lebih lagi untuk fasilitas, tanaman, dan selalu menjaga kebersihan lokasi., Green open space in office buildings has a very important role because its existence is related to aspects of ecological and aesthetic functions of the area. However, there are still many green spaces in Jakarta whose utilization is not optimal. This study aims to identify existing conditions, analyze thermal and aesthetic comfort in the area around Gedung TMT and Sopo Del Tower based on perceptions and preferences. The analysis methods used include Key Performance Index, Temperature Humidity Index, Scenic Beauty Estimation, and descriptive statistical analysis of user perceptions and preferences. The results showed that the number of individuals and tree species are more in Gedung TMT. The assessment of plants in the function of temperature modification, air humidity control, windbreak, and noise dampening at both locations is in the medium category. THI calculation results show that the open area of Gedung TMT has not met the ideal thermal comfort. The assessment results for the aesthetic quality of the Sopo Del Tower landscape are higher than those of the Gedung TMT landscape. Respondents were quite satisfied with the existing conditions of both locations, but there still needs improvements and additional facilities at several locations. Respondents suggested more maintenance for facilities, plants, and location cleanliness.
Keyword: fungsi ekologis, ruang terbuka hijau, fungsi estetika, gedung kantor

Judul: Evaluation of Ecological Functions
of Trees in Two Residential Complexes in West Bogor Sub-District
Abstrak: Perumahan di Kecamatan Bogor Barat terus mengalami perkembangan, termasuk Perumahan Pakuan Regency dan Sinbad Green Residence. Letak kedua perumahan yang strategis dan adanya berbagai aktivitas manusia yang mendorong munculnya berbagai masalah lingkungan, menyebabkan tingkat kenyamanan lingkungan menurun. Hal tersebut membuat RTH berperan penting pada lanskap perumahan. Pohon memiliki beragam fungsi ekologis, diantaranya sebagai modifikasi suhu (peneduh), kontrol kelembapan udara, penahan angin, dan peredam kebisingan. Kesesuaian pola penanaman dalam penataan tata hijau diperlukan agar suhu udara pada lanskap perumahan dapat lebih nyaman. Peningkatan suhu udara mempengaruhi kenyamanan termal bagi populasi yang terdapat pada wilayah tersebut. Tujuan penelitian ini melakukan evaluasi terkait fungsi ekologis pohon dan pola penanaman pada RTH kawasan lanskap perumahan serta menilai kenyamanan termal pada Ruang Terbuka Hijau perumahan tersebut. Tahap penelitian dilakukan melalui beberapa tahapan mulai dari tahap persiapan, inventarisasi, analisis, penilaian dan evaluasi, serta rekomendasi. Fungsi ekologis akan dianalisis dengan membandingkan kondisi eksisting dengan kriteria baku fungsi ekologis. Hasil evaluasi ini menunjukkan bahwa vegetasi di Cluster Jaya Dewata pada Perumahan Pakuan Regency unggul dalam hal modifikasi suhu (peneduh) dengan skor sebesar 257, penahan angin dengan skor sebesar 277, dan peredam kebisingan dengan skor sebesar 218. Vegetasi di Perumahan Sinbad Green Residence unggul dalam memenuhi fungsi pengontrol kelembapan udara dengan skor sebesar 263., Housing developments in West Bogor District continue to grow, including Pakuan Regency and Sinbad Green Residence. The strategic location of the two housing and the existence of various human activities that encourage the emergence of various environmental problems, causing the level of environmental comfort to decrease. This situation highlights the important role of green open spaces in the residential landscape. Trees have various ecological functions, such as temperature modification (providing shade), air humidity control, windbreaks, and noise reduction. Proper planting patterns are needed in green space planning to create more comfortable air temperatures in residential landscapes. Increased air temperature affects thermal comfort for the population in the area. The aim of this study is to evaluate the ecological functions of trees and planting patterns in the green open space of residential landscapes and assess the thermal comfort in the green open spaces of these housing areas. The research stages include preparation, inventory, analysis, assessment and evaluation, and recommendations. The ecological functions will be analyzed by comparing existing conditions with standard ecological function criteria. The evaluation results indicate that the vegetation in Cluster Jaya Dewata at Pakuan Regency excels in terms of temperature modification (providing shade) with a score of 257, windbreak function with a score of 277, and noise reduction with a score of 218. The vegetation at Sinbad Green Residence excels in fulfilling the air humidity control function with a score of 263.
Keyword: fungsi ekologis, kenyamanan termal, ruang terbuka hijau

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model