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Irza Sukmana
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Faculty of Engineering, Universitas Lampung. Jl. Soemantri Brojonegoro No.1 Bandar Lampung – Indonesia. http://eng.unila.ac.id
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Journal of Engineering and Scientific Research (JESR)
Published by Universitas Lampung
ISSN : 26850338     EISSN : 26851695     DOI : https://doi.org/10.23960/jesr.v4i1.78
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Industrial & Manufacturing Engineering
The focus and scopes of JESR is on but not limited to Mechanical Engineering and Material Sciences, Chemical and Environmental, Industrial and Manufacturing Engineering, Computer and Information Technology, Electrical and Telecommunication, Civil and Geodetic Engineering, Architecture and Urban Planning, Geophysical Science and Engineering, and other multidisciplinary research. The main criteria for publication are including the originality, scientific quality and interest to the aim and focus. JESR publishes twice a year for June and December editions. We welcome for publication collaborations with organizer of International Seminars, Conferences and Symposiums around the world. We are encouraging authors to submit their manuscript through our online system.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 130 Documents
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SNR Gain Evaluation in Narrowband IoT Uplink Data Transmission with Repetition Increment: A Simulation Approach Hamdani, Fadil; Susanto, Misfa; Sigwele, Tshiamo
Journal of Engineering and Scientific Research Vol. 5 No. 1 (2023)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v5i1.160

Abstract

Deploying Internet of Things (IoT) on a large scale necessitates widespread network infrastructures supporting Machine Type Communication. Integrating IoT into cellular networks like LTE, known as Narrowband-IoT (NB-IoT), can fulfill this infrastructure need. Standard 3GPP Release 13 introduces NB-IoT's Repetition features, expanding radio transmission coverage while maintaining LTE performance. Focusing on uplink data traffic, this study examines NB-IoT's repetition mechanism, grid resource distribution, and NPUSCH performance through simulations. Results show that at SNR greater than -5 dB, maximum repetitions of 128 yield the highest BLER, while minimum repetitions of 2 result in the lowest. Quadrupling repetitions increases SNR by 5 dB, emphasizing repetition's role in error mitigation and uplink reliability, especially in challenging SNR conditions. For optimal throughput in SNR above -5 dB, maximum repetitions of 128 for NPUSCH format 1 are recommended. These findings underscore the importance of repetition in enhancing Narrowband IoT performance, offering insights for system optimization, where increasing the number of repetitions generally leads to higher SNR gain. The attained BLER and throughput values from Narrowband IoT simulations highlight the robustness of data transmission across varying channel conditions, affirming NB-IoT applicability to a wide range of IoT applications.
The Effect of Chamfer Angle Variations on the Quality of Friction Welding Results of AZ-31B Magnesium Ferdouza, Nouval; Risano, Ahmad Y E; Riszal, Akhmad; Tarkono, Tarkono
Journal of Engineering and Scientific Research Vol. 6 No. 1 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i1.162

Abstract

Friction welding is one of the solid-state welding types. Friction welding is a joining process whose application melts the material itself by using the heat generated between the surfaces through a combination of rotational motion and the application of compressive loads. The use of magnesium alloys is widely used in various industrial fields, examples of magnesium alloy applications include coating materials from iron and steel as a means of protecting against corrosion. The use of AZ-31B series magnesium alloys has a high specific strength compared to other series such as AM. The purpose of this final project research is to determine the effect of the addition of chamfer angle on the tensile strength value and microstructure of AZ-31B magnesium friction welding results. From this research, the results obtained in tensile testing are that the addition of the chamfer angle to the surface of the weld specimen will increase the tensile strength value. The highest maximum stress value was obtained in the chamfer angle variation of 300 with an average of 228.525 MPa and the lowest maximum stress value was in the material that did not use the chamfer angle variation with an average of 105.722 MPa. Based on microstructure testing, it shows differences in ?- Mg and ?-Mg phase grains17 Al12 in each region, this is influenced by heat and also the melting generated from welding so that it changes its microstructure.
Structural Geology Identification based on Derivative Analysis Gravity Data in Tangkuban Perahu Mountain Rasimeng, Syamsurijal; Pratama, Tectona Putra Epriyan; Wibowo, Rahmat Catur
Journal of Engineering and Scientific Research Vol. 6 No. 1 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i1.163

Abstract

The earth is composed of structures with different rock types, properties, and characteristics and can be known by applying the laws of physics in the form of geophysical methods such as the gravity method. The gravity method is a passive geophysical method that is widely used for geodynamic and exploration studies in estimating fault structures. The aim of this research is to model the subsurface geological structure based on the results of derivative analysis of gravity data related to geothermal prospects. The data used are GGMplus gravity acceleration data and topography (elevation) from each measurement point, totaling 6889. The data was then subjected to several corrections to produce a complete Bouguer anomaly. Then, the next stage is derivative analysis, which is used to obtain a subsurface geological structure model and geothermal prospects for the Tangkuban Perahu area. Based on the correlation between derivative analysis and two-dimensional modeling results, it can be seen that the Tangkuban Perahu geothermal system is controlled by structures in the form of horsts and grabens formed due to Tangkuban Perahu volcanic activity. The Tangkuban Perahu geothermal reservoir prospect is estimated to be at a depth of around 0.6 km – 2.8 km with a density ranging from 2.15 g/cc to 2.45 g/cc, which is estimated to be basalt breccia.
Review: The Use of Eco-Enzymes in Greywater Treatment Khotimah, Siti Nurul; Ginting, Simparmin Br; Arifaini, Nur; Mardhotillah, Nur Anisa; Puligadda, Lohit Krishna Pranav
Journal of Engineering and Scientific Research Vol. 6 No. 1 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i1.169

Abstract

Water pollution such as in rivers has become a concern due to its impact on health and the decreasing availability of clean water. There is a common assumption that industrial pollution is the main cause of water pollution. However, an interesting fact is that river pollution is largely dominated by contamination from household wastewater (domestic waste) discharged directly into drainage systems and ending up in rivers without prior treatment. Such cases are particularly prevalent in developing countries. Therefore, the challenge is to find solutions to treat domestic wastewater using simpler and cheaper technologies. Current research is focused on treating domestic wastewater especially greywater with eco-enzymes. Eco-enzymes are enzymes produced from the fermentation process of organic materials such as fruit peels or vegetable scraps for a minimum of three months. This paper will review the treatment of greywater using eco-enzymes, including the eco-enzyme production process, its characteristics, greywater characteristics, the methods employed, and the research findings. Finally, the paper will recommend possible avenues for further research related to the treatment of greywater using eco-enzymes
Cover and Table of Content JESR, Editor
Journal of Engineering and Scientific Research Vol. 6 No. 1 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i1.170

Abstract

Cover and Table of Content
Household Food Security: Evaluation of Influential Variables Using Exploratory Factor Analysis Jelita, Jelita; Irwansyah, Budi; Puji Lestari, Lilla; Darmayani, Satya; Nilna Minah, Faidliyah
Journal of Engineering and Scientific Research Vol. 6 No. 2 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i2.164

Abstract

Understanding the patterns that influence food security is very important. Deconstructing food security assessment into clearly defined variables might enhance its effectiveness. Efforts to improve food security measurements are generally prioritized on the most visible, objectively measurable, and familiar dimensions. In reality, there is sometimes confusion regarding which components of the food security definition a metrics is assessing, leading to the interchangeable use of indicators for distinct food security dimensions. Identifying, studying, and understanding these determining factors is the first step in exploring government policies and strategies to reduce food insecurity in any development. This research aims to analyze and identify those factors that have been identified through literature, their ranking is done by a questionnaire-based survey and an exploratory factor analysis approach. The literature identifies fifteen variables that have an impact on family food security. From these variables, four elements are extracted, which are household debt, distance to market, age of household head, and transportation cost dimensions. The findings of this study can serve as a point of reference for future research aiming to understand the impact of these four characteristics on family food security.
The Evaluation of Low-Cost Apartment Building Lampung University (Rusunawa Building) Using Greenship Rating Tools for Existing Buildings Widyawati, Ratna; Kustiani, Ika; Isneini, M; Girinandi, I; Aminudin, KM; Surahman, R; Aini , N; Mardhotillah , AN
Journal of Engineering and Scientific Research Vol. 6 No. 2 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i2.171

Abstract

The assessment of the green building at the Rusunawa Lampung University was conducted using the Greenship Rating Tools for Existing Building Version 1.1. Measurements were carried out to examine the overall sub-criteria of each greenship assessment category. The greenship rating tools for existing buildings version 1.1 are quite complex, as there are 6 (six) feasibility tests and sub-criteria. Based on field measurements and analysis of the green building assessment criteria using the greenship existing building rating tools version 1.1 at the Rusunawa Lampung University, as there used rating score of 17 points. The final result, the Rusunawa Building Lampung University does not have a rating for the Green Building criteria. To achieve a minimum bronze rating, and an assessment of the greenship assessment categories, the parties felt necessary to obtain recommendations for the improvements according to the assessment matrix that can enhance the Green Building rating for Rusunawa Lampung University.
Assessment of Data Over 3G and 4G LTE Networks in Ibadan Metropolis, Nigeria Olasunkanmi, Oluwaseun Joel; Awofolaju, Tolulope Tola; Emmanuael, Olowookere Oluwasomidotun
Journal of Engineering and Scientific Research Vol. 6 No. 2 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i2.173

Abstract

The routes plied are situated in Ibadan, Oyo State, Nigeria with different longitude and latitude respectively to assess the signal quality of 3G and 4G networks, compare four service/network providers in terms of coverage, service quality with respect to location, and determine areas with weak strength that needs optimization of different operators. The relevance of this study is to provide information as regards each operator in order to provide solution and to educate the subscribers for proper fixed or dynamic internet usage and voice calls. The work would benefit users within the city and the network providers. The mast is built in a sectorial way so that it could serve the arc and has a monitoring neighbor BTS (Base Transceiver Station) in sectorial way so it can circulate the area, though during the test, it was noticed that there are some areas with no monitoring neighbor BTS. The results show the received signal strength indicator (signal strength quality) of each network provider.
Analysis of The Accuracy of Earthquake Parameters In Minahassa Peninsula, Sulawesi, With Seismogram Waveform Data Processing Triyan, Aldi Muhammad; Suharno, Suharno; Yogi, Ida Bagus Suananda; Wibowo, Rahmat Catur
Journal of Engineering and Scientific Research Vol. 6 No. 2 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i2.200

Abstract

The Manihassa Peninsula is located in the northern part of Sulawesi, a meeting point for several major tectonic plates, namely the Sunda Plate, the Philippine Plate and the Pacific Plate. The movement and interaction between these plates cause active seismic conditions. Around the Manihassa Peninsula, there are also local faults that can cause earthquakes. This study aims to analyze the accuracy of earthquake parameters published by BMKG by processing waveform data using the author's SeisComP software. This study uses two waveform data of earthquake events in the Minahassa Peninsula of Sulawesi obtained from WebDC3 and processed using SeisComP software with the results of the first earthquake event with an occurrence time of 2024-08-01 00:00:05 UTC, a depth of 146 km, a location point of latitude 0.07 ?S, longitude 123.37 ?E, a magnitude of 5.4 Mw with RMS Res. 1.6 s and Azimuth Gap 144 ? and the second earthquake event with an event time of 2024-08-22 04:43:05 UTC, a depth of 120 km, a location point of latitude 0.09 ?S, longitude 123.50 ?E, a magnitude of 4.7 Mw with RMS Res. 1.0 s and Azimuth Gap 144 ?. From these results, it can be concluded that the search for earthquake parameters that occur using seismogram waveform data on SeisComP software with open-source limitations has quite a good accuracy.
An Assessment on Green Campus Rating of the University of Lampung Main Campus Kustiani, Ika; Matemba, Esther Elly; Widyawati, Ratna; Putra, Rahmad Syah
Journal of Engineering and Scientific Research Vol. 6 No. 2 (2024)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v6i2.203

Abstract

Currently, people perceive higher education as an industry that operates within a specific area. Therefore, the concept of a green campus or eco-campus can be linked to the concept of a green neighborhood. The aim of carrying out this assessment is to determine the performance of the Gedong Meneng Campus of the University of Lampung based on the Greenship Neighborhood Rating Tool criteria from the Green Building Council Indonesia (GBCI). The research data was obtained primarily based on observations, along with secondary data in the form of formal documents such as the campus master plan and several other documents. Based on the assessment result, despite the fact that the campus has implemented principles of the sustainable green neighborhood concept, it has not been able to obtain even the lowest rank of Greenship Neighborhood. With a score of 38 out of a total of 117 points, or 34.48%, it is only a small difference to achieve a bronze rank. The assessment results led to the formulation of a set of cost-free management solutions aimed at transforming the campus area into a green campus neighborhood. By improving community welfare, movement, and connectivity, as well as land ecology criteria, it is expected that the score would increase by 22 points, resulting in a Silver Rank that can be achieved.

Page 12 of 13 | Total Record : 130

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