Quinoza Guvil

This study evaluates the impact of incorporating lateral mass density variations into geoid models for Java, Indonesia, aiming to enhance the accuracy of regional geoid determinations. Geoid models have traditionally used a constant density assumption; however, Java’s varied topography and geological complexity suggest that density variability may significantly influence geoid accuracy. Employing the Stokes–Helmert method combined with the remove–compute–restore (RCR) technique, we calculated geoid models using both constant density and laterally variable density from the UNB TopoDens model. The models were validated against GNSS/leveling data, showing that while lateral density variations had limited effects along flat topographic profiles, they introduced notable discrepancies in regions with considerable elevation changes. Specifically, variable density models exhibited discrepancies of up to 30 cm in regions with complex terrain, underscoring the importance of selecting appropriate density models for precise geoid computations in heterogeneous landscapes. Nonetheless, a comprehensive validation using geometric geoid models is required to confirm the accuracy improvements across the entire region.

Land cover monitoring is important to maintaining human needs and ecological function balance that will be able to observe, analyse, and present land use form. Some methods that can be implemented to this case are Normalized Difference Vegetation Index (NDVI) and Bare soil Index (BI). Land cover identification is using Pleiades images in 2018 for Jatinangor area, with land cover classes were built in five class, divided by producer’s and user’s accuracy and validated with field survey results. Accuracy of NDVI method is 69.56% with kappa 0.57 also producer’s accuracy is 73.94% water bodies, 84.88% built land, 67.37% open field, 98.79% crops field, and 98.79% vegetation. User’s accuracy in a row for each class are 26.86% 82.78%, 20.01%, 76.15%, and 75.37%. The Accuracy of BI method is 69.17% with kappa 0.52. Producer’s accuracy for each class is 73.28% water bodies, 70.71% land build, 52.83% open filed, 63,04% crop field, and vegetation with 81.29%. User’s accuracy in a row for each class is 17.05%, 81.29%, 21.44%, 65.13%, and 88.54%. Validation of NDVI more fit in the field than BI that can be concluded NDVI has a good result than BI.

Pengendalian on street parking berbasis teknologi parkir meter telah diuji cobadi tiga kawasan pertokoan di kota Padang, salah satunya ruas jalan Permindo, sejak September 2016. Namun penerapan parkir meter tersebut dilaporkan masih belum optimal (Agusmanto, 2017; Wahyudi, 2016). Dari pengamatan visual, kinerja ruas jalan Permindo masih kurang optimal akibat adanya gangguan arus lalu lintas akibat aktivitas parkir dan PKL. Secara konseptual, praktek on street parkingjuga berdampak terhadap pengurangan kapasitas jalan, penurunan Level of Service (LOS), merugikan pengguna angkutan umum dan pejalan kaki, meningkatkan resiko kecelakaan lalu lintas, menurunkan potensi ekonomi, serta menghilangkan ruang publik. Sebetulnya Pemerintah Kota Padang telah melakukan upaya manajemen parkir yang perlu diapresiasi, salah satunya melaluiParking Meter System. Penelitian ini bertujuan mengkaji karakteristik aktivitas on street parking di ruas jalan Permindo pasca diberlakukannya alat meter parkir tersebut.Pendekatan analisis dilakukan secara deskriptif dengan mengamati karaktersitik parkir di kawasan kajian. Metode pengumpulan data sekunder dilakukan melalui survey parkir dan penyebaran kuisioner kepada 100 responden (pengendara dan pengguna ruang parkir).Kajian inidiawali dengananalisis karakteristik parkir. Analisis karakteristik parkir yang dimaksud meliputi perhitungan volume parkir, akumulasi parkir, durasi parkir, Parking Turn Over, kapasitas parkir, indeks parkir dan kebutuhan ruang parkir. Dari hasil tersebut diketahui bahwa ruang parkir yang disediakan sudah tidak mampu lagi menampung kendaraan parkir (IP= 143 % > 100 %). Hasil analisis parkir tersebutperlu dikaitkan dengan hasil analisis deskriptif respon pengguna sistem meter parkir. Pengendalian on street parking dengan formulasi kebijakan yang sesuai perlu dilakukan agar memberi dampak yang berarti khususnya terkait pola aktivitas parkir masyarakat. Hasil penelitian ini merupakan tahap preliminary analisis yang dapat digunakan sebagai catatan bagi perumusan kebijakan perparkiran dikawasan Permindo.

In this paper, it will be studied stability for a SEIR epidemic model with infectious force in latent, infected and immune period with saturated incidence. From the model it will be found investigated the existence and uniqueness solution of points its equilibrium. Existence solution of points equilibrium proved by show its differential equations system of equilibrium continue, and uniqueness solution of points equilibrium proved by show its differential equation system of equilibrium differentiable continue.

For a connected graph and a subset of . For a vertex the distance betwen and is . For an ordered k-partition of , the representation of with respect to is The k-partition is a resolving partition if are distinct for every The minimum k for which there is a resolving partition of is the partition dimension of In this paper will shown resolving partition of connected graph order where is a bipartite graph. Then it is shown dimension partition of bipartite graph, are pd(Kst)=n-1