Judul: Generalized LASSO to Analyze Factors of COVID-19 Booster Vaccine Uptake in Sumatra Island
Abstrak: Vaksinasi booster atau dosis ketiga untuk COVID-19 mulai diberikan kepada masyarakat umum sejak awal 2022 di Indonesia. Meskipun upaya pemerintah untuk menyediakan vaksin booster, cakupan vaksinasi di Pulau Sumatera baru mencapai 29,67% dari target total 208.265.720 orang. Diantara sepuluh provinsi di Pulau Sumatera, hanya Sumatera Utara dan Aceh yang telah mencapai target nasional, dengan cakupan masing-masing sebesar 32,94% dan 30,44%. Studi ini mengkaji faktor-faktor yang memengaruhi vaksinasi booster COVID-19 di Pulau Sumatera berdasarkan kedekatan antar wilayahnya, dan mengevaluasi model terbaik yang dihasilkan. Peubah respon yang digunakan pada penelitian ini adalah jumlah vaksinasi booster COVID-19 di pulau Sumatera tahun 2022. Penelitian ini mempertimbangkan Jumlah Puskesmas, Desa, Siswa Aktif, Persentase Penduduk Miskin, dan Produk Domestik Regional Bruto (PDRB) pada tahun yang sama sebagai prediktor potensial untuk memahami faktor-faktor yang memengaruhi vaksinasi booster. Generalized LASSO digunakan dalam penelitian ini karena memiliki kemampuan untuk menjalankan tujuan-tujuan tersebut. Penelitian ini menggunakan K-Nearest Neighbor dengan nilai K sebesar 2, 3, 4, dan 5 untuk menentukan kedekatan antar provinsinya. Hasil analisis menggunakan metode Generalized LASSO menyatakan bahwa peubah-peubah yang digunakan memiliki pengaruh terhadap kedekatan antar provinsi di Pulau Sumatera. Peubah Jumlah Desa memiliki dampak yang sama pada kesepuluh provinsi di Pulau Sumatera. Peubah Jumlah Puskesmas dan Persentase Penduduk Miskin masing-masing membentuk dua dan tiga kelompok wilayah. Peubah Jumlah Siswa Aktif dan PDRB membentuk empat kelompok wilayah. Model terbaik pada penelitian ini didapatkan ketika nilai K sebesar 2 dan lambda sebesar 0,607. Model ini menghasilkan nilai R2 sebesar 0,754, RMSE sebesar 0,368, dan MAPE sebesar 2,548., Booster vaccinations or the third dose for COVID-19 began to be administrated to the public from early 2022 in Indonesia. Despite government efforts to provide booster vaccines, vaccination coverage in Sumatra Island has only reached 29.67% of the total target of 208,265,720 people. Among the ten provinces on Sumatra Island, only North Sumatra and Aceh have reached the national target, with coverage of 32.94% and 30.44% respectively. This study examines the factors influencing COVID-19 booster vaccination in Sumatra Island based on proximity between regions, and evaluates the best model generated. The response variable used in this study is the number of COVID-19 booster vaccinations on the island of Sumatra in 2022. This study considers the Number of Health Centers, Villages, Active Students, Percentage of Poor People, and Gross Regional Domestic Product (GRDP) in the same year as potential predictors to understand the factors that affect booster vaccination. Generalized LASSO is used in this study because it has the ability to carry out these objectives. This study uses K-Nearest Neighbor with K values of 2, 3, 4, and 5 to determine the proximity between provinces. The results of the analysis using the Generalized LASSO method state that the variables used have an influence on the proximity between provinces on the island of Sumatra. The variable Number of Villages has the same impact on all ten provinces on the island of Sumatra. The variables Number of Community Health Centers and Percentage of Poor Population form two and three regional groups, respectively. The variables Number of Active Students and GRDP form four regional groups. The best model
Keyword: COVID-19, Generalized LASSO, LASSO, Vaccine

Judul: The Correlation between Community Participation and The Effectiveness of the COVID-19 Vaccination Program (Case: RT 09 dan RT 16 RW 07 Pondok Bambu Village East Jakarta City)
Abstrak: Program vaksinasi COVID-19 sebagai program pemerintah dalam rangka percepatan penanganan pandemi COVID-19 di Indonesia. Partisipasi masyarakat diperlukan dalam pelaksanaan program tersebut. Penelitian ini bertujuan untuk menganalisis tingkat partisipasi masyarakat pada program vaksinasi COVID-19, menganalisis tingkat efektivitas program vaksinasi COVID-19, dan menganalisis hubungan antara tingkat partisipasi masyarakat dengan tingkat efektivitas program. Responden dalam penelitian ini berjumlah 30 orang. Penelitian ini menggunakan metode kuantitatif yang didukung data kualitatif dengan analisis uji korelasi Rank Spearman. Hasil penelitian menunjukkan tingkat partisipasi masyarakat dominan berada pada tingkat informasi, tingkat efektivitas program vaksinasi COVID-19 tergolong efektif, dan tingkat partisipasi masyarakat dengan tingkat efektivitas program vaksinasi COVID-19 memiliki hubungan positif., The COVID-19 vaccination program is a government program in the context of accelerating the handling of the COVID-19 pandemic in Indonesia. Community participation is required in the implementation of the program. This study aims to analyze the level of community participation in the COVID-19 vaccination program, analyze the effectiveness of the COVID-19 vaccination program, and analyze the correlation between the level of community participation and the level of program effectiveness. Respondents in this study amounted to 30 people. This study uses quantitative methods supported by qualitative data with Rank Spearman correlation test analysis. The results showed that the dominant level of community participation was at the information level. The effectiveness of the COVID-19 vaccination program was classified as effective, and the level of community participation and the effectiveness of the COVID-19 vaccination program had a positive relationship.
Keyword: participation, program effectiveness, vaccination

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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