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All Journal Proceedings of KNASTIK Al-Jabar : Jurnal Pendidikan Matematika Jurnal Math Educator Nusantara: Wahana Publikasi Karya Tulis Ilmiah di Bidang Pendidikan Matematika Wiyata Dharma: Jurnal Penelitian dan Evaluasi Pendidikan Jurnal Magister Pendidikan Matematika (JUMADIKA) AMM Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika Edumatika Setawar Abdimas Indonesian Journal of Aerospace
Wahyu Widada
Edwar Technology Co
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Computer Science & IT Decision Sciences, Operations Research & Management Education Mathematics Social Sciences

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PENERAPAN LOW PASS FILTER UNTUK MEMPERBAIKI HASIL ESTIMASI SUDUT PADA SISTEM RADIO TRACKING ROKET Zain, Satria Gunawan; Susanto, Adhi; Widodo, Thomas Sri; Kliwati, Sri; Widada, Wahyu
Indonesian Journal of Aerospace Vol. 8 No. 1 Juni (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Radio tracking system can be applied to track the position of a rocket and is potential to be developed to replace the GPS technology. This system is used to estimate the direction angle (azimuth and elevation) of transmitter source. In measurement and trial there are many noises that cause the results of angle estimation are not accurate. These noises can be obsreved from the value of the angle estimation varied for a fixed measurement point. This is caused by the interference on the received sinyal. This paper discusses the application of low pass filter to eliminate noises in the radio receiver system. Experiment results show that the variation of estimates angle becomes 1600 times smaller compared to the one without filter
ON-BOARD FUNDAMENTAL FREQUENCY ESTIMATION OF ROCKET FLIGHT EXPERIMENTS USING DSP MICROCONTROLLER AND ACCELEROMETER Syah, Agus Harno Nurdin; Kliwati, Sri; Widada, Wahyu
Indonesian Journal of Aerospace Vol. 7 No. 1 Juni (2009): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Fundamental frequency vibrasi roket pada saat terbang sangat penting diukur untuk pengembangan sistem elektronik maupun mekanik muatan roket. Tulisan ini membahas metode pengukuran fundamental frekuensi tersebut dengan menggunakan sensor accelerometer dan 32 bit DSP (Digital Signal Processor) microcontroller. CPU ini digunakan untuk akuisisi data dan perhitungan algoritma DFT (Discrete Fourier Transform) serta algoritma penentuan frekuensi fundamentalnya. Deteksi fundamental frekuensi berbasis envelope (lowpass filter) spektrum frekuensi. Sistem yang telah dibuat dapat dikombinasikan dengan radio modem untuk pengiriman data dengan kecepatan serta sampling rate yang cukup tinggi. Maksimum frekuensi yang dapat diestimasi hingga 2 kHz, cukup untuk parameter roket.
PREDIKSI TRAYEKTOR WAKTU-NYATA ROKET BALISTIK DENGAN MENGGUNAKAN GPS Widada, Wahyu
Indonesian Journal of Aerospace Vol. 1 No. 1 (2003): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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This paper described the real-time prediction of the trajectory of a balistic rocket based on gps data. The method was used a parabolic motion under the assumption of a constant gravitational acceleration. The algorithm was successfully applied to GPS flight data of a RX150 rocket launched at Pameungpeuk, Jawa Barat
RANCANGAN DAN ANALISA ANTENA DI PERMUKAAN BADAN ROKET Kliwati, Sri; Widada, Wahyu
Indonesian Journal of Aerospace Vol. 2 No. 1 (2004): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2004.v2.a791

Abstract

The antenna telemetry is usually placed in the body of LAPAN rocket for the launching campaign, which affected to the quality of radio communication. Especially, such effect increas the antenna overshadow to the surface of body rocket, which not influenced to the aerodynamic of rocket. This antenna was made by using the PCB plate with size of 1 cm width and 1 per 2 also 1 per 4 length for the frequency of 900 MHz
METODE KALIBRASI TIME DIFFERENT OF ARRIVAL TDOA UNTUK SISTEM PASSIVE RADAR TRAYEKTORI ROKET Widada, Wahyu; Kliwati, Sri
Indonesian Journal of Aerospace Vol. 5 No. 2 (2007): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Design passive ranging base on radio with Time Different of Arrival TDOA (passive RADAR) have been developed for the application of tracking rocket trajectory. Calibration of the passive RADAR can be done in launching site for obtaining optimal position, however it is also require to be done in laboratory for testing the system algorithm. This article describes the calibration method of time delay calculation in laboratory using antenna cable with various of lengths. We obtain an accurate correlation results between time delay from measurement of oscilloscope and calculation TDOA with cross-correlation method. This method is practical and effective for calibration system in the development of passive RADAR. Keywords: TDOA, Passive RADAR, Trajectory rocket, Calibration method, Cross-correlation.-
Decoding cognitive transitions in undergraduate mathematics: An integrated APOS AND SOLO+ framework for formal epsilon-delta limit proofs Nugroho, Khathibul Umam Zaid; Sukasno, Sukasno; Widada, Wahyu; Alias, Norma; Herawaty, Dewi; Anggoro, Shadaqnas Dewarif Tri
Al-Jabar: Jurnal Pendidikan Matematika Vol 17 No 2 (2026): Al-Jabar: Jurnal Pendidikan Matematika
Publisher : Universitas Islam Raden Intan Lampung, INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/ajpm.v17i2.31308

Abstract

Purpose: This study examines cognitive transitions and epistemological obstacles in undergraduate mathematics education by testing an integrated APOS and SOLO+ framework within formal ε-δ limit proofs. Method: Using an explanatory sequential mixed-methods design, CB-SEM analyzed data from 278 undergraduates to test theoretical structural relationships. Qualitatively, a "diagnostic task analysis" employing the Constant Comparative Method examined task-based interviews from 8 key informants to dissect transitional cognitive anomalies. Findings: CB-SEM confirmed that Structural Complexity (SOLO+) significantly partially mediates the effect of Cognitive Mechanisms (APOS) on Proof Proficiency, explaining 62.4% of the variance. Qualitative autopsies identified two specific transitional traps: Interiorization Instability (Semi-Relational level), marked by universal quantifier failures and reversed logic in linear tasks; and Encapsulation Rigidity (Semi-Extended level), marked by intuitive blockages during bounding strategies in non-linear tasks. Consequently, a grounded taxonomy was generated to distinguish superficial syntactic "slips" from deep-seated epistemological "errors." Significance: This framework shifts pedagogical evaluation from outcome-based syntax to transitional cognitive diagnosis, providing a powerful blueprint for addressing learning barriers and laying the theoretical foundation for future diagnostic tools.
Path analysis of AI-based assessment use in higher education: The roles of self-efficacy, digital literacy, and perceived academic  performance Widyawati, Santi; Widada, Wahyu; Yensi, Nurul Asuti
Al-Jabar: Jurnal Pendidikan Matematika Vol 17 No 3 (2026): Al-Jabar : Jurnal Pendidikan Matematika
Publisher : Universitas Islam Raden Intan Lampung, INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/ajpm.v17i3.31588

Abstract

Purpose: The growing adoption of artificial intelligence (AI)-based assessment in higher education has created new opportunities to enhance learning evaluation. However, empirical evidence explaining how students’ digital literacy and self-efficacy relate to AI-based assessment use and perceived academic performance remains limited, particularly in developing higher education contexts. This study examined the structural relationships among digital literacy, self-efficacy, AI-based assessment use, and perceived academic performance among university students.Method: A quantitative cross-sectional survey was conducted using purposive sampling involving 100 undergraduate students from five teacher education programs at Universitas Nahdlatul Ulama Lampung, Indonesia. Data were collected through a structured questionnaire comprising multi-item measures of digital literacy, self-efficacy, AI-based assessment use, and perceived academic performance. The proposed structural relationships were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM).Findings: The results indicated that digital literacy was positively associated with self-efficacy and AI-based assessment use. Self-efficacy showed a significant positive relationship with perceived academic performance and emerged as the strongest predictor of this construct. In contrast, AI-based assessment use and digital literacy were not directly associated with perceived academic performance. These findings suggest that students’ psychological readiness plays a more important role than technology use alone in explaining perceived academic performance within AI-supported assessment environments.Significance: Unlike previous studies that primarily emphasize technology acceptance or technological effectiveness, this study integrates digital literacy and self-efficacy within a structural model of AI-based assessment use to explain students’ perceived academic performance in an Indonesian higher education context. The findings provide practical implications for higher education institutions seeking to strengthen students’ digital competencies and self-efficacy to support the effective implementation of AI-based assessment.
Co-Authors Adhi Susanto Adi Susanto Alias, Norma Anggoro, Abdurrobbil Falaq Anggoro, Abdurrobbil Falaq Dwi Anggoro, Shadaqnas Dewarif Tri DEWI HERAWATY Ismoen, Muhaimin Izwanto, Eddy Khathibul Umam Zaid Nugroho Rahmat Jumri romi wiryadinata Santi Widyawati Sarwoedi, Sarwoedi Sasongko Pramono Hadi Sri Kliwati Sukasno Syah, Agus Harno Nurdin Thomas Sri Widodo WAHYUDI Yensi, Nurul Asuti Zain, Satria G.