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Journal of Science and Applicative Technology
Published by Institut Teknologi Sumatera
ISSN : 25810545     EISSN : 25810545     DOI : -
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Materials Science & Nanotechnology Mechanical Engineering
Journal of Science and Applicative Technology is soon indexed by google scholar, SINTA (Science and Technology Index), portal garuda, DOAJ (Directory of Open Access Journals). This journal has been registered at PDII LIPI (ISSN: 2581-0545). This journal is semiannual journal. It will be published in June and December. The objective of the journal is to provide a room for students, researchers, lecturers, pratictioners and communities to present their ideas regarding several topics covered in this journal. Journal of Science and Applicative Technology covers wide area of research. We welcome full research articles in the following area, including but not limited to : 1. Renewable Energy 2. Green Infrastructure 3. Community Development 4. Computer Science 5. Civil and Environmental Engineering 6. Electrical Engineering 7. Mechanical Engineering 8. Telecommunication 9. Earth and Planetary Sciences (Geography, Geodesy, Geology, Geophysics, Oceanography, Astronomy, Atmospheric) 10. Natural Sciences (Mathematics, Chemistry, Physics, Statistics) 11. Life Sciences (Biochemistry, Biology, Pharmacy) 12. Regional and City Planning
Arjuna Subject : -
Articles 223 Documents
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Analisis Prestasi Akademik Mahasiswa Teknik Informatika Institut Teknologi Sumatera (ITERA) Berdasarkan Jalur Seleksi Masuk Perguruan Tinggi Negeri Mohamad Idris
Journal of Science and Applicative Technology Vol 5 No 1 (2021): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i1.410

Abstract

Indicators of student success in the academic at university is the Cumulative grade point average (GPA). Assessed from the Selection Pathways students for State Universities, it is suspected that there are differences in the academic achievement of students. Therefore, this study aims to determine and analyze the academic achievement of students based on the Selection Pathways students at the Department of Informatics Engineering, ITERA. This research is a quantitative research. The population in this study were all students who still active at the Department of Informatics Engineering generation 2017, 2018, and 2019. The samples of this study were 239 (SNMPTN), 239 (SBMPTN), and 35 (Mandiri). The data collection methods were conducted using documentation techniques in the form of GPA data’s students and the Selection Pathways students. Data were analyzed using the ANOVA test. The results of data analysis research were obtained an average GPA of students in the SNMPTN (2.93), SBMPTN (2.89), and Mandiri (2.59). Result of ANOVA test showed that F count (4.363) > F table (3.0133). The conclusion of this study showed that there are significant differences in the academic achievement of students Based on the Selection Pathways for State Universities.
Peramalan Cryptocurrency dengan Autoregressive Integrated Moving Average (ARIMA) dan Risiko Kerugian dengan Value at Risk (VaR) Amalia Listiani; Dani Al Mahkya
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.904

Abstract

Blockchain is a technology that is used for recording digital transactions that are interconnected and cannot be changed. Cryptocurrencies use blockchain technology, which has advantages due to a high level of security, low fees, and a high return on investment. One of the most popular cryptocurrencies and one that has a high market cap is Bitcoin. High volatility carries the risk of large losses. So it is necessary to analyze the risk of loss and forecast Bitcoin. Forecasting is carried out using the Autoregressive Integrated Moving Average (ARIMA) model, which is then carried out by risk analysis using Value at Risk (VaR) using the Historical Data method. Based on the research results, ARIMA [4,1,2] was great for predicting Bitcoin, with a Mean Absolute Percentage Error (MAPE) of 6%. Based on the results of research with Value at Risk (VaR), investors have a maximum loss tolerance of 5.86% and there is a 5% possibility that the losses will exceed 5.85%.
Optimasi Multi Respon pada Proses End-Milling Glass Fiber Reinforced Polymer (GFRP) Dengan Menggunakan Metode Back Propagation Neural Network – Particle Swarm Optimization (BPNN-PSO) Fajar Perdana Nurullah; Abdul Muhyi; Devia Gahana Cindi Alfian
Journal of Science and Applicative Technology Vol 5 No 2 (2021): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i2.447

Abstract

The use of composite materials continues to show an increasing trend in various fields such as sports, aviation and the military. This also increases the need for knowledge about the manufacturing process of composites. One of the most widely used composite materials is glass fiber reinforced polymer (GFRP). In the process of making components made from GFRP, one of the processes that is often used is end-milling. The studies that have been carried out on the GFRP end-milling process mostly use woven fibers, while research on machining of GFRP using combo fibers has not been widely conducted. This research was conducted to determine the effect of spindle speed, feeding speed, and cutting depth, on cutting forces, surface roughness, and delamination. In addition, multi response optimization is carried out using the combined method of BPNN-PSO to obtain the most optimal combination of machining parameters. The results shows that the optimal level of cut depth, spindle speed, and feeding speed are 1 mm, 4871 rpm and 788 mm / minute, respectively.
Analisis Kesesuaian Lahan Kawasan Lahan Basah (Wetland) untuk Perencanaan Tata Guna Lahan Berkelanjutan di Kabupaten Tulang Bawang Dwi Bayu Prasetya; Hediyati Anisia
Journal of Science and Applicative Technology Vol 5 No 1 (2021): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i1.310

Abstract

The wetland area in Tulang Bawang Regency is a stretch of swamps that has an important value ecologically and hydrologically and has economic value. However, currently, the area's condition has begun to change its function to agricultural land, resulting in damage to the habitat and function of swamps, causing a decrease in biological resources such as fish and bird populations. The use of wetlands must be carefully planned and designed with land use principles with a sustainable perspective. The aim of this research is; 1.) Identifying the potential for hydrology, potential land use, and the condition of biodiversity in the Wetland area; 2) Formulating alternative land suitability in the wetland area planning in Tulang Bawang Regency by taking into account biophysical factors and area functions. This research's approach method is spatial pattern analysis, which is to study the patterns, shapes, and distribution of phenomena on the earth's surface. In addition, understand the meaning of these patterns and use them in sustainable land use planning. Based on the results of land suitability analysis for wetland planning in Tulang Bawang Regency, it can be concluded that this area is classified as very suitable (S1) with a score of 93.33. For the development of wetlands through nature conservation and cultural heritage of the Tulang Bawang community as objects and the main attraction of this area.
Studi Inhibisi Korosi Pipa Sistem Pendingin Sekunder RSG-GAS BATAN Oleh Karboksimetil Kitosan Edwin Rizki Safitra; Dwi Cahyani; Idra Herlina
Journal of Science and Applicative Technology Vol 6 No 1 (2022): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i1.764

Abstract

Corrosion is one of the unavoidable problems in nuclear reactor cooling systems that use water as a cooling medium. secondary cooling systemThe Reaktor Serba Guna–G.A. Siwabessy (RSG-GAS) is an open recirculation cooling system that uses carbon steel pipes for water delivery. Due to the obvious open recirculation cooling system, components in the system interact with oxygen in the air, resulting in corrosion. Corrosion control in the RSG-GAS has been accomplished through the continuous injection of zinc phosphate (ZnPO4) inorganic inhibitors, but the use of these inhibitors can contribute to environmental pollution and health issues. To resolve these concerns, environmentally-friendly corrosion inhibitors such as carboxymethyl chitosan have been used. CMC (carboxymethyl chitosan) is widely used because it is more amphiprotic than other chitosan derivatives. Because of the number of functional groups in carboxymethyl chitosan, it is an effective corrosion inhibitor. The corrosion inhibition test by CMC on carbon steel in the secondary cooling water system was performed using a weight-loss method in this study with variations of 0, 1, and 3 g CMC. The steel material's composition is 0.23% C, 0.17% Si, 0.008% P, 0.004% S, 0.012% Cr, and 0.037% Mn. According to the study, the corrosion rate generated at variations of 0, 1, and 3 g CMC is 8.237, 5,645, and 5,113 mpy, respectively. According to the data, the addition of CMC can reduce the weight loss of steel due to corrosion because CMC contains many amphiprotic groups that are adsorbed on the surface in half-full d Fe orbitals.
Modifikasi Algoritma Kriptografi Klasik dengan Implementasi Deterministic Finite Automata melalui Partisi Pesan Asli berdasarkan Kriteria Pesan Bagian Angga Wijaya
Journal of Science and Applicative Technology Vol 4 No 2 (2020): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v4i2.346

Abstract

Classical cryptography is study of securing a secret message (plaintext) into a hidden message (ciphertext) which in the process changes each character. The process of converting plaintext into ciphertext is called encryption, the reverse process is called decryption. There is monoalphabetic algorithm, which changes each plaintext letter paired wisely with one particular letter in the ciphertext. The weakness of this algorithm is that the encryption rules can be guessed by analysing the frequency of occurrence of letters. Meanwhile, in polyalphabetic cipher, an algorithm that allows the same letter to be encrypted into different letters. One of them is the Vigenere cipher, which uses keywords that can be repeated to add to the plaintext in the computation of integer modulo. However, this algorithm can be solved using the Kasiski method, because pattern of repeating keywords. In this research, a Deterministic Finite Automata computation model is applied to partition messages before being processed with keywords. Partitions that are formed based on the criteria of message parts ending by the letter E, as letters that often appear in English text. This can increase the security of classical cryptographic algorithms, because they cannot be attacked by frequency analysis or Kasiski methods.
Distribution Strategies Analysis Using AHP and TOPSIS: A Distribution Company Case’s Study in Special Region of Yogyakarta, Indonesia Teny Sylvia; Noveliska Br Sembiring; Nadia Ulfiyati
Journal of Science and Applicative Technology Vol 5 No 2 (2021): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i2.364

Abstract

The selection of distribution strategy is important for the company in order for the product to be delivered to the customer in time and according to the required quality and quantity. This research aims to analyze and determine the company's distribution strategy using the AHP and TOPSIS methods. The results of the calculations with AHP indicate that the distributor reliability is seen from the history and experience (0268), effective fund management (0159), and the financial structure of the distributor (0147) are three criteria with the weight of interest highest. The geographical strategy is a strategy that has the highest value so it is recommended to be the main strategy of the company in distributing products to customers.
Pengoptimalan Pembangunan Flyover Pramuka Melalui Pengaturan Intensitas Bangunan di Kota Bandar Lampung Balqis Febriyantina Gunari; M. Abi Berkah Nadi
Journal of Science and Applicative Technology Vol 5 No 1 (2021): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i1.399

Abstract

Kota Bandar Lampung sebagai ibukota Provinsi Lampung menyebabkan jumlah pergerakannya tinggi sehingga kemacetan lalu lintas tidak dapat dihindari pada beberapa ruas jalan di Kota Bandar Lampung. Penyelesaiaan atas permasalahan tersebut oleh pemerintah Kota Bandar Lampung dilakukannya pembangunan flyover di beberapa ruas jalan yang mengalami kemacetan, salah satunya di ruas Jalan Pramuka. Flyover Pramuka dibangun pada tahun 2017 dan memiliki daya tahan menjaga arus stabil berjangka waktu hingga 10 tahun dari saat keberadaan flyover memberikan pengaruh positif terhadap penurunan volume capacity rasio (VCR). Waktu jenuh jalan eksisting dan flyover diketahui dengan menggunakan metode analisis sensitivitas melalui pembebanan bertahap. Hasil penelitian menunjukkan bahwa pembangunan flyover menyebabkan kondisi jalan eksisting dan sisi flyover mengalami waktu jenuh pada tahun 2028-2038 sehingga penting untuk Pemerintah Kota Bandar Lampung mengantisipasinya dengan menetapkan aturan intensitas bangunan. Jenis kegiatan yang terdapat di wilayah internal dan wilayah eksternal di dominasi oleh perdagangan dan jasa. Pengaturan intensitas bangunan sebagai bentuk pengoptimalan pembangunan flyover penting untuk memperhatikan pula arahan rencana struktur ruang yang ikut mempengaruhi beban lalu-lintas pada jalan eksisting dan flyover. Kata Kunci: flyover, intensitas bangunan, wilayah internal, wilayah eksternal
Komparasi Indikator Rumah Layak Huni dan Permukiman Kumuh Indonesia Tetty Harahap
Journal of Science and Applicative Technology Vol 5 No 1 (2021): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i1.426

Abstract

Perkembangan Kota yang tidak diantisipasi adalah awal dari munculnya permasalahan perumahan dan permukiman. Di Indonesia permasalahan permukiman dikelompokkan menjadi empat macam, yaitu permasalahan backlog perumahan, rumah tidak layak huni, permukiman kumuh dan rumah liar. Bila diobservasi, penampakan fisik permukiman kumuh dan rumah tidak layak huni tidak jauh berbeda. Tujuan dari penelitian ini adalah mengidentifikasi kesesuaian indikator untuk permukiman kumuh dan rumah layak huni. Unit amatan dan analisis dalam penelitian ini adalah pemenuhan indikator rumah layak huni di permukiman kumuh Kota Bandar Lampung dan perbandingan indikator permukiman kumuh dan rumah layak huni Indonesia dengan beberapa negara lain (Malaysia, Korea, Australia, Kanada, dan Inggris). Metode yang digunakan adalah metode deduktif kuantitatif dan teknik analisis uji fisher exact dan komparasi indikator. Hasil dari penelitian ini adalah (1) tidak signifikannya hubungan pemenuhan indikator rumah layak huni dan kekumuhan dan (2) Indikator Rumah Layak Huni beberapa negara lain (Malaysia, Korea, Australia, Kanada, dan Inggris). Indikator tersebut merupakan gabungan dari Indikator permukiman kumuh dan rumah layak huni milik Indonesia. Dengan adanya penelitian ini, diharapkan Indikator penentuan permukiman kumuh dan rumah layak huni dapat diintegrasikan sehingga dapat mengefektifkan dan mengefisienkan penanganan permasalahan permukiman di Indonesia.
ARANG AKTIF SERAT SABUT KELAPA DAN APLIKASINYA SEBAGAI ADSORBEN ION KROMIUM(III) DARI LARUTAN AIR Manuntun Manurung; Widihati Widihati; I.A.G. Yunilawati
Journal of Science and Applicative Technology Vol 6 No 2 (2022): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v6i2.1003

Abstract

The coconut husk contains high cellulose, so it can be processed as a basic materials to make activated charcoal. The purpose of the study was to make activated charcoal from coconut husk fiber with hydrochloric acid activator and to determine the effect of changing coconut husk fiber into charcoal, as well as activation of the adsorption power of Cr(III) metal ions from solution. The research started by separating the coconut husk fiber, carbonization at various temperatures. The resulting charcoal was characterized according to SNI 06-3730-1995. The best quality charcoal was activated with HCl, then coconut husk fiber, unactivated and activated charcoals were applied to absorb Cr(III) ions. Optimization of adsorption parameters such as contact time, solution pH, temperature and adsorption isotherm were also studied. The results showed that the optimum carbonization temperature was 600oC, contact time was 5 hours, optimum pH was 6, room temperature. The adsorption capacity of Cr(III) ions were 8.2580 mg/g, 13.5645 mg/g and 16.1452 mg/g for coconut husk fiber, unactivated and activated charcoal, respectively. The increase in adsorption power from coconut husk fiber to charcoal was 64.36% and from charcoal to activated charcoal increased by 19.02%. Coconut husk fiber and unactivated charcoal followed the Langmuir isotherm while activated charcoal followed Freundlich.

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