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All Journal International Journal of Applied Mathematics, Sciences, and Technology for National Defense
Napitupulu, Jofim Yordaniel
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Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Mathematics Physics

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Simulation of calculation of combat vehicle fuel efficiency by reducing vehicle weight using aluminum material Napitupulu, Jofim Yordaniel; Murniati, Riri; Kusumadjati, Adhi; Hirawan, Agung; Alwan, Mochamad Ibnu; Blanchard, Ramandasoavina
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 Natio
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v2i1.336

Abstract

In the contemporary landscape, combat vehicles are tasked with meeting multifaceted demands, ranging from fortified defense capabilities to enhanced operational versatility and lethal efficacy. At the crux of these requirements lies the pivotal challenge of managing vehicular weight, a parameter that profoundly impacts endurance, agility, and speed. Extensive research endeavors have shed light on aluminum as a compelling solution to mitigate this weight burden while ensuring the requisite durability in combat vehicles. Through the utilization of MATLAB simulations, this study endeavors to elucidate the correlation between mass reduction and fuel efficiency, culminating in the creation of a comparative graph. The findings of this research make a significant contribution by demonstrating that a 15 percent reduction in vehicle mass, equivalent to 324 kilograms through the substitution of conventional materials with aluminum, yields substantial fuel savings amounting to 13.36 percent, or 1.3 liters. Such insights underscore the pivotal role of material selection in optimizing fuel efficiency in combat vehicle design
Ultrasonic sensor system for detection of the objects position in two-dimensional plane Kusumadjati, Adhi; Napitupulu, Jofim Yordaniel; Setiawan, Roni; Samosir, Andrew Imada; Cengiz, Korhan
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol 1, No 1 (2023): International Journal of Applied Mathematics, Sciences, and Technology for Natio
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v1i1.168

Abstract

Ultrasonic sensors are usually used to measure the distance to the object in front of it. It can be used to measure object distances accurately at a detection angle of 15 degrees to the sensor's normal plane and can be carried out up to a maximum distance of 4 m. Three ultrasonic sensors arrange in a triangular configuration can be used to determine the position of objects within the detection area formed by the three sensors. The sensors are positioned and the coverage angle is limited so that detection between sensors in the formation does not overlap or interfere with each other. In addition, using the position data for each unit of time, it is possible to find out the direction of movement of the object. Based on the above concepts, microcontrollers, data acquisition systems, and data processing systems can be used to measure the position and orientation of an object's movement in real time.
Anti-kyphosis smart bag detection of overweight bag load and improper spinal posture in army members when using work bags Hirawan, Agung; Renoult, Muhammad Rey; Parwatiningtyas, Diyan; Dahlan, Iqbal Ahmad; Kusumadjati, Adhi; Napitupulu, Jofim Yordaniel
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 Natio
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def..v2i3.410

Abstract

Heavy field equipment owned by soldiers such as backpacks unknowingly makes soldiers move with the wrong body posture when in the field. Carrying a bag with a heavy load and the wrong posture (slouching), can cause abnormalities in the spine, such as slouching (kyphosis). Therefore, a posture therapy is needed with the method of habituation using a work bag with a load not exceeding 15 percent of the user's body weight and using it with the correct posture. This therapy / habituation is of course carried out outside of field training hours that do not ignore the use of heavy loads, for example in the office or anywhere else when carrying a bag. Seeing this, researchers are trying to create and develop an anti-kyphosis smart bag that can prevent and treat spinal deformities. After making the system, this smart bag was then tested quantitatively with the aim of seeing the qualification of the system's ability to detect excess bag weight, if the weight of the bag exceeds 15 percent of the user's body weight and the ability of the system to detect improper posture seen from the sensitivity level of the load cell sensor based on its placement position in the back area. The test was conducted on three respondents who were selected based on their height, namely 170 cm, 175 cm, and 182cm. The system calibration results show that the system works accurately, with a measuring error of 0% and effective sensor placement between the thoracic kyphosis and lumbar lordosis areas of the back, with the ability to detect a bend angle of at least 24.7°. Seeing the effectiveness of this anti-kyphosis smart bag, it is hoped that it can be a smart solution for TNI members in maintaining spinal posture to avoid kyphosis due to the habit of carrying excessive loads with the wrong body posture.
Co-Authors Alwan, Mochamad Ibnu Blanchard, Ramandasoavina Cengiz, Korhan Dahlan, Iqbal Ahmad Hirawan, Agung Kusumadjati, Adhi Murniati, Riri Parwatiningtyas, Diyan Renoult, Muhammad Rey Rony, Zahara Tussoleha Samosir, Andrew Imada