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All Journal International Journal of Applied Mathematics, Sciences, and Technology for National Defense
Atmadi
Indonesia Defense University
Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Mathematics Physics

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Analysis of submerged breakwater models using ripple tank Mutmainnah; Viviq Ardita Wulandari; Roman Argus; Atmadi; Raditya Faradina Pratiwi; Imastuti
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol. 1 No. 2 (2023): International Journal of Applied Mathematics, Sciences, and Technology for Nati
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v1i2.222

Abstract

A breakwater is an infrastructure that functions to dampen wave energy. To secure the area directly adjacent to the coast, an effective breakwater model is needed based on the analysis of the dissipation coefficient value ( ). This study aims to determine a good breaker model based on the  value using a ripple tank. The data analyzed were wave heights before and after passing through the breakwaters of the three concrete models whose arrangement was varied. The results showed that the breaker model that is effective in reducing wave energy is the Grooved cube model with holes arranged horizontally based on the resulting small reflection coefficient ( ) and transmission coefficient ( ) values and large  values
Development of magnetic materials for cobalt titanium oxide using mechanical milling and the characterization methods Imastuti; Adi Wisnu Ari; Mutmainnah Mutmainnah; Haziza Elsa Putri; Raditya Faradina Pratiwi; Atmadi
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol. 1 No. 2 (2023): International Journal of Applied Mathematics, Sciences, and Technology for Nati
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v1i2.224

Abstract

In the synthesis of magnetic materials for absorbing radar waves, it is necessary to have a base material that has unique magnetic properties that can reach the broadband characteristics of radar frequencies. Cobalt titanium oxide is synthesized using mechanical milling. The phase formed by calcination at 1000℃ with a holding time of 5 hours. Sample characterization was carried out by XRD, VSM and VNA. Based on the research results, it was found that the material obtained had semiparamagnetic properties. From the SEM measurements, it is reactive to the sintering temperature. Radar wave absorption measured by VNA shows that cobalt titanium oxide shows a value with uniform absorption in the X-band wave.
Linear mixed model approach: The effect of poor people & unemployment rate on various types of crime in 34 provinces in Indonesia Atmadi; Nieldy R Tarigan; I Putu Aditya Brama Putra Cakra Negara; Najlaa Syalaisa; Muhammad Iqbal Al-Banna Ismail
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol. 2 No. 1 (2024): International Journal of Applied Mathematics, Sciences, and Technology for Nati
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v2i1.350

Abstract

Currently, Indonesia faces serious challenges related to increasing crime rates throughout the country. Various types of crime, such as increasing drug cases, increasingly concerning violations of decency, and disturbing acts of fraud, embezzlement, and corruption, have become a major concern for society and the government. In this context, this research plays an important role in efforts to understand the factors that drive the growth of crime and pursue the vision and mission of Indonesia Emas 2045, which sets targets to reduce poverty to reach zero percent. The main focus of the research is to link poverty and unemployment rates with three key types of crime that affect Indonesia's future. In this study, we try to understand how poverty rates and unemployment rates affect these types of crime in 34 provinces in Indonesia. The study used a statistical method called Linear Mixed Model with the support of R software. Of the 27 models analyzed, several models had a significant impact. The data used in this study was obtained from the Central Statistics Agency (BPS). The results of this study provide valuable insights into the factors influencing crime in Indonesia, which in turn can be used as a basis for designing more effective policies in an effort to achieve the vision and mission of Indonesia Emas 2045.
Insights into latent tuberculosis biomarkers from differential gene expression analysis in CD8 memory cells using secondary data Insilico approach Atmadi; Tiara Rahayu; Indah Kusuma Wardani; Reihana Marsha Cahyani Elsadi; Azizah Eka Milasari; M. Ridwan Amarullah Witadi
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol. 2 No. 3 (2024): International Journal of Applied Mathematics, Sciences, and Technology for Nati
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def..v2i3.362

Abstract

Tuberculosis (TB) remains a global health challenge, significantly impacting infectious disease mortality and morbidity. In the quest for effective diagnostic tools and precise treatment strategies, differential gene expression (DEG)-based biomarkers offer a promising avenue. These biomarkers provide specific insights into disease states and treatment responses by deciphering gene alterations within body cells. In this study, we aimed to identify immunological signatures associated with latent Mycobacterium tuberculosis infection in memory T cells. Leveraging transcriptomic analysis, we examined memory CD8 T cells from individuals with latent TB (NCBI-GEO GSM2643205) and healthy controls (NCBI-GEO GSM2643198). Our findings highlight candidate biomarker genes—LDB1, ZNF121, and STAT6—whose differential expression could significantly enhance our understanding of CD8 T cell genetic regulation during latent TB infection. These results hold promise for the development of more accurate biomarkers for diagnosing latent tuberculosis.
Rice distribution optimization using initial basic feasible and modified solution to increase food security in West Java Fachri Al Aziz Putrandi; Divacha Vicha Mollie; Atmadi; Julio Rivaldo Sembiring; Abdul Fakhar
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol. 3 No. 1 (2025): International Journal of Applied Mathematics, Sciences, and Technology for Nati
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v3i1.434

Abstract

Rice is one of the main commodities needed by more than 95% of developing countries, including Indonesia. High population growth that is not accompanied by sufficient rice production will lead to many problems such as malnutrition, famine, and economic crisis, so the availability of rice in Indonesia is the main focus in food security. Farmer welfare is one of the factors in increasing rice production. But in reality, farmers are often constrained by the high cost of distributing rice.  As one of the largest rice producing regions in Indonesia, optimisation of rice distribution costs in West Java needs to be done. the process of optimising rice distribution costs can be done using the transportation method. The transportation method is carried out in 2 stages, namely obtaining the initial solution and the optimal solution. Initial Basic Feasible Solution (IBFS) as one of the approaches in obtaining the initial solution works by considering the average value of new unit costs and columns. As for obtaining the optimal solution, MODI is used, which calculates the opportunity cost of cells that are not given a distribution allocation to assess the optimality of the table. Optimisation of rice distribution using IBFS and MODI resulted in an initial solution of Rp 27,259,921600 and an optimal solution of Rp 27,259,921600 with the Bandung area as the area that supplies the most rice in West Java.
Co-Authors Abdul Fakhar Adi Wisnu Ari Azizah Eka Milasari Divacha Vicha Mollie Fachri Al Aziz Putrandi Haziza Elsa Putri I Putu Aditya Brama Putra Cakra Negara Imastuti Indah Kusuma Wardani Julio Rivaldo Sembiring M. Ridwan Amarullah Witadi Muhammad Iqbal Al-Banna Ismail Mutmainnah Mutmainnah Mutmainnah Najlaa Syalaisa Nieldy R Tarigan Raditya Faradina Pratiwi Raditya Faradina Pratiwi Reihana Marsha Cahyani Elsadi Roman Argus Tiara Rahayu Viviq Ardita Wulandari