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All Journal Pendidikan Matematika Science and Technology Indonesia Jurnal TNI Angkatan Udara Integra: Journal of Integrated Mathematics and Computer Science
Desiana Putri
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Aerospace Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics

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PENGARUH PENERAPAN PEMBELAJARAN KOOPERATIF TIPE NUMBERED HEADS TOGETHER DISERTAI KOMIK TERHADAP PEMAHAMAN KONSEP MATEMATIS SISWA KELAS VIII SMPN 5 PADANG Putri, Desiana; Aima, Zulfitri; Yunita, Alfi
Pendidikan Matematika Vol 2, No 2 (2013): Jurnal Wisuda Ke 47, Genap 2013-2014 Pendidikan Matematika
Publisher : STKIP PGRI Sumbar

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Abstract

Background of this research the interest of students in learning mathematics is still less so the comprehension of mathematics concepts is low in VIII grade and it can be seen from math quiz point in VIII grade at SMPN 5 Padang academic year of 2013/2014. This research aimed to determine whether students comprehension of mathematics concepts by implementing cooperative learning type Numbered Heads Together using Comic better than conventional learning in VIII grade at SMPN5 Padang. This type of research is experimental research using design randomized trials on the subject. The research population was a VIII grade at SMPN 5 Padang academic year of 2013/2014 except class VIII1 and VIII2 because it has a different Minimum Completeness Criteria. Technique sample using randomly, using class VIII3 as experimental class and class VIII5 as control class. The research instrument was a test of comprehension of mathematics concepts using the reliability = 0.78. The data analysis technique used is the one side t test using MINITAB software. Based on the analysis of the data found that the two sample classes are normally distributed and homogeneous at significance level α = 0.05. Hypothesis test results obtained P - value = 0.000 is less than α , the research hypothesis is accepted. It can be concluded that the students comprehension of mathematics concepts by implementing cooperative learning Type Numbered Heads Together using Comic better than conventional learning in VIII grade at SMPN 5 Padang.
The Comparison of the Nearest Neighbor and Modified Sollin Algorithms for Determining the Shortest Tour for BNI Bank Branches in Lampung Province Maharani, Assyfa Dwipa; Putri, Desiana; Sapitri, Nonik Mega; Notiragayu; Ansori, Muslim
Integra: Journal of Integrated Mathematics and Computer Science Vol. 2 No. 3 (2025): November
Publisher : Magister Program of Mathematics, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/integrajimcs.20252342

Abstract

BNI is one of the government -owned banks in Indonesia. At certain times, BNI experiences a significant increase in the number of customers, which can lead to long queues. In such situations, customers generally consider visiting other BNI branches. To optimize time and cost, it is necessary to have information to determine the shortest tour between BNI locations in Lampung Province. The purpose of this study is to determine the shortest tour among 21 BNI locations in Lampung Province. The results show that both the Nearest Neighbor Heuristic Algorithm and the Modified Sollin’s Algorithm produce the same solution for Euclidean distance data and Haversine distance data. However, for time-based data, the Modified Sollin’s Algorithm performs better than the Nearest Neighbor Heuristic Algorithm.
3. APU STARTER MOTOR RELIABILITY ANALYSIS P/N 2704506 – 4 AIRBUS A320S USING WEIBULL DISTRIBUTION AND FAILURE MODE AND EFFECT ANALYSIS AT PT INDONESIA AIRASIA Yogi Prisma; Caesar Pradewa; Feti Fatonah; Djoko Herwanto; Desiana Putri; Muchammad Furqon; Suroso; Dikasitama
Jurnal TNI Angkatan Udara Vol 5 No 1 (2026): Jurnal TNI Angkatan Udara Triwulan Pertama
Publisher : Staf Komunikasi dan Elektronika, TNI Angkatan Udara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62828/jpb.v5i1.190

Abstract

This study aims to determine the reliability value and failure characteristics ofthe APU starter motor P/N 2704506-4, as well as to identify the failure mode qualitatively toprovide improvement recommendations for PT Indonesia AirAsia. The starter motor in theauxiliary power unit (APU) is a vital component that functions to start the operating cycle.The method used is a mixed method, with quantitative analysis through processing historicaltime to failure data from 20 unscheduled removal cases using the Weibull distribution, andqualitative analysis through failure mode and effect analysis. Data were obtained from theAircraft Maintenance Manual, Component Maintenance Manual, and semi-structuredinterviews with engineers. The analysis results show a value of β = 2.029 (β>1) whichindicates a wear-out failure pattern. The scale parameter η recorded 3,095.71 flight hourswith a mean time to failure of 2,742.85 hours. Reliability projections show that at 2,800 hours,reliability drops to 44.23% with a failure probability of 55.77%. The FMEA analysis identifiedthree failure modes: brush wear, terminal winding burn, and oil contamination. Of these,brush wear was the dominant failure mode, with 12 cases and the highest RPN value (252).The study concluded that starter motor failure is predictive and dominated by brush wear.The primary recommendation is to transition to a preventive maintenance strategy throughvisual inspection of brush wear indicators and scheduled replacement at 2,500–2,600 flighthours to reduce unscheduled removals and increase aircraft availability.
The Relation of Tribinomial Coefficients with Triangular, Catalan and Mersenne Number Wamiliana; Putri, Desiana; Notiragayu
Science and Technology Indonesia Vol. 11 No. 2 (2026): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2026.11.2.750-757

Abstract

Numbers are inseparable from mathematics. Each of these types of numbers has its own distinct definition and properties. Numbers are not only used in mathematics, but are also essential in other fields such as philosophy, technology, and science. Tribinomial coefficients, Catalan numbers, and Mersenne numbers are three types of numbers that has their own uniqueness and beauty. Tribinomial coefficients derived from triangular number using similar definition for binomial coefficients. Triangular numbers constitute a class of figurative numbers derived from the systematic arrangement of discrete units (such as dots) into the geometric configuration of an equilateral triangle. The Catalan numbers constitute a sequence of positive integers that emerge in numerous combinatorial enumeration problems. Formally, the n-th Catalan number is defined by the closed-form expression: $C_n = \frac{1}{n+1} \binom{2n}{n}= \frac{(2n)!}{(n+1)!n!}, n \in N$. Mersenne numbers are the numbers known in mathematics that also have their own beauty and uniqueness. When represented using binary, all Mersenne numbers are repeating 1s. The first eight Mersenne numbers are 1, 3, 7, 15, 31, 63, 127, 255, which are represented in binary as 1, 11, 111, 1111, 11111, 111111, 1111111, 11111111. In this study the relationship of Tribinomial coefficients with Catalan and Marsenne numbers will be disccused.
Co-Authors Alfi Yunita Caesar Pradewa Dikasitama Djoko Herwanto Feti Fatonah Maharani, Assyfa Dwipa Muchammad Furqon Muslim Ansori Notiragayu Sapitri, Nonik Mega Suroso Wamiliana Yogi Prisma Zulfitri Aima