Indonesia Conference Directory

Corresponding Author
tris Sutrisno

Institutions
Politeknik Negeri Bandung
sutrisno[at]polban.ac.id

Abstract
Microwave amplifier is a radio frequency device used for many applications in telecommunication technology such as C Band weather radar application. The microwave amplifier usually exists in transmitter section to amplify weak signal that will be delivered to antenna. This paper discuss, design and fabrication of a microwave amplifier using High Mobility Electron Transistor (HMET) CGH40006P. The reason using such kind of transistor is due to its high gain and linearity. In order to achieve maximum power transfer at frequency of 5.6 GHz. The amplifier is constructed in cascade architecture using the same type of transistors. Open ended single stub matching impedance networks are applied in this design as well. Based on measurement result, power gain of 21 dB is obtained for +20 dBm input power with Voltage Standing Wave Ratio (VSWR) of 1.1 and 13 dB noise figure.

Keywords
open single stub, noise figure ,gain, linearity

Topic
Electrical Engineering

Link: https://ifory.id/abstract/bxcLJA3WXnC7

Corresponding Author
Chaznin R. Muhammad

Institutions
Teknik Industri, Universitas Islam Bandung
Jl. Tamansari No.1 Bandung 40116

Abstract
CNC Machining Center is a type of CNC machine that can does several processes simultaneously. In some cases, this machine is often single used to make a product through several production stages, from raw material to end product. The reason for using a single machine is to avoid material handling time from one production stage on one machine to the next on another machine. In the case of batch production, the use of a single machine will cause the products flow time to be long which will certainly increase the cost of work in process (WIP) inventory. This research was conducted to reduce the cost of WIP inventory of motorcycle spare parts on the CNC Machining Center. Minimization of WIP inventory cost is done through two steps. Step 1 is to allocate three production stages to three serial CNC Machining Centers. Stage 2 is determining the transfer batch size (10 units) is smaller than the production batch size (50 units). The results of this study indicate that the WIP inventory cost for the use of a single machine is Rp. 2.150,250, while the WIP inventory cost for three serial machines is Rp. 202,100.

Keywords
CNC Machining Center, batch production, WIP inventory, production batch, transfer batch.

Topic
Industrial Engineering

Link: https://ifory.id/abstract/e9nGzwfVpJZM

Corresponding Author
Herdy Puradimaja

Institutions
Universitas Pendidikan Indonesia
*herdypuradimaja[at]gmail.com

Abstract
The purpose of this research is to learn how utilize mobile based in digital learning media in automotive engineering education. This study uses the Systematic Literature Review method by reviewing journals that discuss mobile based digital learning media, from 2014 to 2019. The result show that mobile based digital learning media can be used easily include in automotive engineering educatiove user to be a reference for researchers about the aplication of mobile learning media in automotive engineering education.

Keywords
based mobile, digital learning media, automotive engineering

Topic
Engineering Education Research

Link: https://ifory.id/abstract/xBk9XtEmzMfQ

Corresponding Author
Aditya Ramadhan Islami

Institutions
Universitas Pendidikan Indonesia, Bandung, Indonesia
a.ramadhan[at]student.upi.edu

Abstract
The purpose of this article is to study the use of devices and media for mobile learning. This research was conducted using a systematic literature review, which was published in only 30 journals published in 2014 to 2019 that discussed mobile learning. The results of this literature review state that there are a number of devices used in Mobile Learning such as iPods, MP3 Players, Smartphones, UMPCs, Laptops and Tablet PCs. Technological devices currently being used are smartphones, laptops and tablet PCs. That devices can facilitate applications such as Quick Response Code (QR), Augmented Reality (AR) and Virtual Reality (VR) that require devices to access cameras, GPS, Gyroscope Sensors, Accelerometer Sensors, Sensor compass and Magneto meter. This mobile learning can be used in vocational learning, specifically in practical learning that can be done with simulation or physical learning skill.

Keywords
Mobile learning, Augmented Reality, Vocational, Vusual Reality

Topic
Technical and Vocational Education

Link: https://ifory.id/abstract/uG3Cf8xtARqr

Corresponding Author
Fachri Koeshardono

Institutions
Politeknik Negeri Bandung, Ministry of Industry

Abstract
Engineering drawing as language between designer and manufacturer has been stagnant for the last century. However, with the rise of information technology in the past decade, the paper based document become digital format. It is inevitable for the engineering drawing toward this trend especially in the era of Industry 4.0. Model Based Definition is incepted when ASME Y14.41 was introduced in 1994. This paper present the model based definition of fire safe valve body in early stage of reverse engineering. This model that contains the data of product then could be used as further use especially in manufacturing process planning.

Keywords
Model Based Definition, Engineering Drawing, Reverse Engineering, Manufacturing Process Planning

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/VW7KtbgdYArz

Corresponding Author
Khalis Khalifanatama Adiranti

Institutions
Universitas Pendidikan Indonesia, Bandung, Indonesia
khaliskhalifanatama[at]gmail.com

Abstract
The purpose of the study is to find digital learning models suited to industrial needs and to find out what efforts have been made to bridge the vocational education gap with the demands of the industrial revolution (ri) 4.0. To determine answers, the writer does a systematic literature review of the digital learning model is used asa basic method of developing study skills for graduate graduate can compete in the international journal of well-known and accredited national journals for 2014 to 2019. The result reveals the use of interactive animation helps students in obtaining concepts, thanks to their visual and interactive features. This interactive animation has been embedded in many examples, drills and automatic evaluation tests, which facilitate understanding of different concepts. That impact will enable it to standardize vocational education graduates according to the requirements of the industrial revolution (ri) 4.0.

Keywords
digital learning, learning model, partnership model

Topic
Technical and Vocational Education

Link: https://ifory.id/abstract/h6cWmCdUbZu8

Corresponding Author
Afrizal STP

Institutions
Post-Graduate Studies School, Universitas Pendidikan Indonesia, No. 207, Dr. Setiabudhi Street, Bandung 40154, Indonesia
*afrizal[at]upi.edu

Abstract
Cyber-physical system (CPS) as one of the aspects in the cyber-system of industrial revolution 4.0 is currently widely used by industry for its development. The integration of computation and physical process control in line with technological development benefits from its implementation. Vocational Education as a provider of labor in the industry must respond to CPS through teaching factories so that it is inline in the Industry. The purpose of this paper is to analyze the concept of CPS that is applied in the current industry. The method used in making this paper is a systematic literature review. The paper search results illustrate that CPS is a management model in the industry that applies the principle of technology integration. The working principle of the CPS-based industry has the characteristics of the integration of cyber human systems and cyber-physical systems. CPS has been widely used in the current industry, but has not yet been developed in vocational education so that it will widen the gap between the industry and vocational education. Need further research for the development of CPS in vocational education

Keywords
cyber physical system, Teaching factory, industry 4.0

Topic
Technical and Vocational Education

Link: https://ifory.id/abstract/bPGkwCQjgW2e

Corresponding Author
Dwi Suhartanto

Institutions
Department of Business Administration
Politeknik Negeri Bandung
Indonesia

Abstract
Introduction The online food delivery service industry has emerged as huge and prospective industry. In this competitive business environment, having and developing loyal customer are essential; yet, research to examine customer loyalty modelling in this industry is limited. Aim of the study This study is designed to assess the applicability of Partial Least Square Modelling to assess the customer loyalty toward online food delivery service. Method This study uses a survey of 439 online food service customers collected from greater Bandung region. The model, including four quality system predictors (efficiency, fulfilment, availability, and privacy), was examined using SmartPLS software. Result The results show that the model of loyalty toward online food has an acceptable Goodness of Fit Index. Further, the R2 of the customer loyalty in the model is 0.67. These results indicate that the method applied is suitable for modelling customer loyalty. Conclusion This study offer an empirical evidence on the applicability of Partial Least Square to model the customer loyalty toward online food delivery service. This result extends the existing methodological and managerial practices to develop loyalty in the online food industry.

Keywords
Partial least square, Online food industry, Customer loyalty

Topic
Industrial Engineering

Link: https://ifory.id/abstract/zDuvTA9y6RE4

Corresponding Author
veronikha effendy

Institutions
(a) Informatics Department, School of Computing, Telkom University
Jl. Telekomunikasi Terusan Buah Batu, Bandung 40257 Indonesia
(b) Information technology Department, School of Computing, Telkom University
Jl. Telekomunikasi Terusan Buah Batu, Bandung 40257 Indonesia
veffendy[at]telkomuniversity.ac.id
danangjunaedi[at]telkomuniversity.ac.id

Abstract
Emergencies can occur anytime, anywhere, and to anyone. The local government offers an application called "Panic Button" as a solution to these problems. This application aims to help people who experience or see emergency conditions so that they can be followed up by the authorities. However, this application has not been targeted at disability users. The procedure for using this application still has weaknesses that make it difficult for users with hearing loss, especially when an emergency event is confirmed. Normally, emergency event confirmation uses telephone calls to the incident reporter (user). This confirmation method is a big problem for those users with disabilities to be able to confirm the details of emergency events. In this research, a user interface re-design was carried out at the application interface to be able to accommodate the needs of users. The interaction re-design is built using the User-Centered Design (UCD) method to produce a design that matches the users characteristics and limitations. The resulting prototype was evaluated using the USE Questionnaire method and results in a usability value of 87% with a very good category after the 3rd iteration. These results indicate that the results of the re-design that have been done are quite easy to learn and use by users.

Keywords
emergency, disability, panic button, UCD, USE Questionnaire

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/A2rL8gbUJj4Y

Corresponding Author
Suryani Suryani

Institutions
1Departement of Chemical Engineering, Politeknik Negeri Lhokseumawe, 24301, Aceh-Indonesia
*suryanisalim[at]yahoo.com

Abstract
Cinnamon essential oil (CEO) is a natural antimicrobial being investigated for food packaging as a substitute for synthetic chemicals due to consumer concerns over food safety. In this study, lactic acid poly (PLA) and chitosan were successfully modified with essential oil (CEO) at concentrations (1.5%, 2%, 2.5%, and 3% v / v) that formed composite fibres with using a simple electrospinning method. The morphology of the composite fibres can be seen from PLA / CS-CEO-2.5 showing good stability of the CEO so that the antimicrobial activity is increased compared to other blends. PLA / CS-CEO fibre shows a high level of long-term inactivation against Escherichia coli and Staphylococcus aureus due to the CEOs ongoing release, indicating that advanced PLA / CS-CEO fibres have great potential for active food packaging applications

Keywords
CEO, PLA, chitosan, packaging

Topic
Material Engineering

Link: https://ifory.id/abstract/uMyadGLHKv3h

Corresponding Author
Setya Wibawa

Institutions
Universitas Negeri Surabaya

Abstract
The mobility of students in the world of education is displaced by social media which is a concern for educators to utilize, create or innovate in the world of Education. In this study aims to utilize moodle mobile in the development of learning material as an online learning media that approaches social media platforms. The media application development method uses Black Box, consisting of (1) feasibility study, (2) requirements, (3) system design, (4) Coding, (5) Testing system, (6) Acceptance Test. Sample testing on media experts, Acceptance Test uses a response assessment consisting of 5 aspects namely Perceived ease of use (PEOU), Perceived usefulness (PU), Perceived Enjoyment (PE), and Intention to use (INT). From the analysis of the Acceptance Test study for 130 students Perceived ease of use (PEOU) of 92.30%, Perceived usefulness (PU) of 86.34, Perceived Enjoyment (PE) of 88%, and Intention to use (INT) of 87, 10% Then from the two classes using independent T-Test two samples showed that the value of the T-test reached 0.046 where the value was below the significance value of 0.05, indicating that H0 was rejected and accepted H1, and so the result was a difference between learning outcomes using the method conventional and learning using Moodle Mobile.

Keywords
enjoyable Learning, Moodle Mobile, Acceptance Test

Topic
Computers, Internet, Multimedia in Engineering Education

Link: https://ifory.id/abstract/He9PR7r8aydp

Corresponding Author
Suharjanto Utomo

Institutions
Prodi Informatika Universitas Nurtanio Bandung

Abstract
Mortar is one of the weapons that is still used for warfare. In determining the direction of mortar shoot there are still using conventional way with paper. Then it takes a portable calculator that is fast and accurate in determining the angle of elevation and angle of azimuth. So it is proposed that this mortar fire direction is a mobile application with multiplatform development method that can run on Windows, Android, and iOS operating systems. The result of this research is a prototype mobile application that provides a report of elevation angles and azimuth angles rather than mortar quickly and accurately to the intended goal.

Keywords
mortar, elevation, azimuth, multiplatform

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/QXFq86dvgkrb

Corresponding Author
Achmad Rusmanto

Institutions
a) Department of Civil Engineering General Ahmad Yani University, Jl. Terusan Jend. Sudirman, Cibeber, Kec. Cimahi Selatan, Cimahi, Jawa Barat 40525, Indonesia
*smg.7ph1[at]gmail.com
b) Department of Civil Engineering State Polytechnic of Bandung, Jl. Gegerkalong Hilir, Ciwaruga, Kec. Parongpong, Kabupaten Bandung Barat, Jawa Barat 40559, Indonesia

Abstract
The Ancam Port is planned to be a roll on - roll off ship. That is why the Ancam port is equipped with a moveable bridge to anticipate tides. The Moveable Bridge structure is a steel frame bridge with a length of 35,740 meters with one joint and another that can move vertically. This vertical free movement is accommodated by the pontoon but cannot deform in a horizontal plane in the direction of the bridge extending, causing damage to the connection between the pier and the moveable bridge. Tidal river conditions cause the pontoon to move vertically. Under the pontoon there are indications of piles emerging from the riverbed and recurring collisions occur due to tides. This causes leakage so that water enters and causes an imbalance from the pontoon and a collapse of the Moveable Bridge occurs. The movable bridge analysis method is carried out using SAP 2000 software. Based on the analysis of the collapse the moveable bridge is able to withstand the planned load on the condition that the pontoon has to function properly. The solution to re-enable the moveable bridge is to use a geofoam-type styrofoam pontoon wrapped in steel plates.

Keywords
Ancam Port, Movable Bridge, Pontoon

Topic
Civil Engineering

Link: https://ifory.id/abstract/DqMKL8zFynvH

Corresponding Author
Ginny Ginanjar Mustofa

Institutions
Universitas Pendidikan Indonesia, Bandung, Indonesia
*okeginny[at]upi.edu

Abstract
The making of this paper aims to analyze the definition, development and use of multi platform technology in education. Literature reviews was used to identify ten relevant journals that were published from 2015 to 2019. All of the journals were classified based on variations in technology, operating systems, and content of multi platform applications that have been developed. The findings of this literature review indicate that multi platform technology is a multimedia application that can be operated on a variety of desktop and mobile devices and various operating systems. The development of multi platform technology was done by combining several technologies such as web, hybrid and native. Some common features found in multi platform technology are graphics, video, AR, VR, text, and sound. Multi platform technology was able to made the access of learning information more easier, interest, effective and efficient.

Keywords
multi platform, multimedia, application development, technologies use in education

Topic
Technical and Vocational Education

Link: https://ifory.id/abstract/PKr3Xz4dCQvU

Corresponding Author
Erlangga Bayu Setyawan

Institutions
a) School of Industrial and System Engineering, Bandung Telkom University,
Telekommunication St. No.1, Bandung 40257, Indonesia
*erlanggabs[at]telkomuniversity.ac.id

b) School of Industrial and System Engineering, Bandung Telkom University,
Telekommunication St. No.1, Bandung 40257, Indonesia
*novitasarinia[at]telkomuniversity.ac.id

c) School of Industrial and System Engineering, Bandung Telkom University,
Telekommunication St. No.1, Bandung 40257, Indonesia
*prafajars[at]telkomuniversity.ac.id

Abstract
The focus of this research is to doing analysis and study of public cemeteries as supporters of green space in Bandung regency for 2018 until 2028 period with the aim to determine number of population in Bandung Regency with considering total population, population growth rate, and mortality rate. The method used in this study is ARIMA (P, Q, N). Based on the results of the analysis and study of public cemeteries (TPU) as supporters of Green Open Space in the Bandung Regency area for the period 2018 to 2028, state that cemetery conditions in Bandung Regency require new burial sites. This is evidenced by the results of forecasting (forecasting) of the population per district in Bandung Regency from 2019 to 2028. In making forecasting there are special cases in certain districts. For example, Kutawaringin District can only be forecasted within the next 5 years, because Kutawaringin District is a new subdistrict since 2008, so more historical data is needed to obtain forecasting results over a 10-year period. Based on the conclusions obtained, the authors suggest the Department of Housing and Land Service District Government Bandung Regency to conduct further research, namely the determination of the optimal number of funerals and graves in Bandung district

Keywords
Forecasting, Operation Research, ARIMA

Topic
Industrial Engineering

Link: https://ifory.id/abstract/2PCwXH3ZMKDt

Corresponding Author
Mira Ayu Lestari

Institutions
Fashion Management Education Study Program, Departement of Family Welfare, Faculty of Technology and Vocational Education, Indonesian Education University
Email: mira.ayu0904[at]gmail.com, marlina[at]upi.edu, mkarmila[at]upi.edu.

Abstract
ABSTRACT Spinning is the process of converting fiber into yarn through several stages, namely: Blowing, Carding, Drawing, Roving and Ring Spinning. Cotton fiber spinning is one of the materials in the General Textile course. The media used is still in Power Point, so learning multimedia is developed for Cotton Fiber Spinning course. This study aims to identify the learning media used in cotton fiber spinning material, design and make multimedia videos on Cotton Fiber Spinning learning, and conduct validation, revision, verification and data analysis. This research used Research and Development (R&D) method through the stages of design, production, validation, revision, and data analysis. The results of multimedia video validation of cotton fiber spinning learning by material experts obtained an average of 97.5% and the results of multimedia expert validation obtained an average of 95.94%. From the results of the validation, the average percentage is included in the "Eligible" category, so that the Multimedia Video Learning of Cotton Fiber Spinning can be used in the process of learning of cotton fiber spinning. The recommendation that the author proposes is to the lecturers of General Textile course, it is expected that multimedia videos of cotton fiber spinning learning can be used as learning media for General Textile course.

Keywords
multimedia learning video, cotton fiber spinning

Topic
Computers, Internet, Multimedia in Engineering Education

Link: https://ifory.id/abstract/Znt8GdCmRzpa

Corresponding Author
Hanny Noviyanti

Institutions
Educational of Fashion Design Study Programme, Home Economics Department, Universitas Pendidikan Indonesia.
Educational of Information Technology, Informatics Department, Universitas Negeri Surabaya, Indonesia.

Abstract
The bleaching batik inverse cap technique is a new innovation by replacing the coloring process on the batik cap with the bleaching technique so that it produces batik that has its own aesthetic value and uniqueness. The stamping technique in this study is the inverse cap technique. Based on the manufacturing of batik, the bleaching technique starts from determining the batik motif, the process of seizing/composing the canting cap motif, and the bleaching process. The method used in this research is the Research and Development method, including: (1) the analysis phase, (2) the planning stage, (3) the production phase, (4) the validation stage, (5) the revision stage, (6) the assessment stage. The results of the validation from the material experts obtained a percentage of 97.1% that interactive learning multimedia is considered very appropriate to be used as a medium of learning in reverse batik bleaching techniques as decoration applications on the bag. Validation from multimedia experts obtained a percentage of 98.6% that multimedia interactive learning is considered very suitable to be used as a learning medium. The results of a limited trial of the user obtained a percentage of 93.8% considered to be very appropriate to be used to support the learning process of reverse stamped batik bleaching techniques as decoration applications on bags.

Keywords
Multimedia Video Tutorial, Batik Inverse Cap Bleaching Technique, Application Decoration, bag

Topic
Computers, Internet, Multimedia in Engineering Education

Link: https://ifory.id/abstract/kdHAFQNRfa42

Corresponding Author
Nita PA Hidayat

Institutions
1) Industrial Engineering, Bandung Islamic University, Jl. Taman Sari no 1 Bandung, Indonesia
* nita.ph[at]gmail.com
2) Industrial Engineering, Sahid University of Surakarta, Jl. Adi Sucipto no 154 Solo, Indonesia
3) Industrial Engineering, Bandung Institute of Technology, Jl. Ganesha Bandung, Indonesia

Abstract
This research is to address a problem of scheduling batches consisting of multiple item parts processed on a batch processor where each item requires a certain processing time which may differ from others. A number of parts are defined as a batch and processed simultaneously with sharing a set up time. A batch can be formed of the parts with different type of item and the processing time of batch equals the longest processing time of parts in the batch. It is assumed that an excessive duration of processing the parts will not lead to any defect, but increase the operating cost. The completed part must simultaneously be delivered at common due date, d. The objective is to minimise total actual flowtime of parts through the shop. An algorithm to solve the problem is proposed and numerical examples are shown.

Keywords
Batch Scheduling, Batch processor, Actual Flow Time

Topic
Industrial Engineering

Link: https://ifory.id/abstract/AeGZKqbxEfhv

Corresponding Author
Krisnhadi Bima

Institutions
Universitas Telkom

Abstract
Internet of Things (IoT) is a paradigm for connecting any devices onto internet. The IoT applications can be implemented in IoT, for example, e-health, smart logistics, smart transportations, and smart homes. In smart logistics, objects and deliveries location need to be updated in real time, so they can be tracked easily. Asset tracking employs Global Positioning System (GPS) and commonly General Packet Radio Service (GPRS) connections to send telemetry data to database server. Narrowband-IoT (NB-IoT), a new cellular standard that is optimized for Low Power Wide Area Network (LPWAN) applications, such as asset tracking. Compared to GPRS, it has smaller uplink transmit power and has decent uplink speed. In this paper, NB-IoT was utilized for asset tracking. The performance of NB-IoT was compared to GPRS, specially for these parameters: latency, throughput, packet loss, and power usage. The result obtained shows that, NB-IoT has average latency around 1.4 seconds, with packet loss (UDP) 44% compared to GPRS 68%. NB-IoT has better power consumption during data transmission against GPRS (0.405 W vs 0.737 W) even though both of them have similar uplink throughput (around 350 B/s). From this test result, this new cellular standard is appropriate in Asset Tracking application.

Keywords
Internet of Things (IoT), General Packet Radio Service (GPRS), Narrowband-IoT (NB-IoT), smart logistic, asset tracking

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/ZY8bQMvLatfK

Corresponding Author
Meifal Rusli

Institutions
Mechanical Engineering Department, Faculty of Engineering, Andalas University, Kampus Limau Manis, Padang 25163 - Indonesia.
*henderydahlan[at]eng.unand.ac.id,
*meifal[at]eng.unand.ac.id

Abstract
The phenomenon of crack branching is one of the typical fracture behaviors. The effect of orientation crack branching is investigated in this paper. By considering a static branched crack in a 2D plate under uniaxial traction, the numerical study is carried out for two study cases. The first study case is a symmetric crack branching in which the various crack branching lengths and orientations have same value between both cracks branching. The second case is an asymmetric case crack branching. In this case, both crack branching length has constant certain value. Furthermore, the first orientation of crack branching is constant and then the second one has various values. The stress intensity factors of the crack tips are calculated for both study cases. It is revealed that for the symmetric case, the increasing of the crack branching length will increase the value of stress intensity factor for various orientations of crack branching. Whereas, the stress intensity factor will tend to decrease along with the increasing of the crack branching orientation. In the asymmetric case, the stress intensity factor of first crack branching will increase, but the stress intensity factor of second crack branching will decrease along with increasing of the second orientation crack branching.

Keywords
crack branching; crack orientation; stress intensity factor

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/L8HDwRBNYeUM

Corresponding Author
Bandiyah Sri Aprillia

Institutions
Telkom University

Abstract
There is a potential of collision hazard on the railroad crossing then the crossing guard will give the signal and call the control station to stop the train that passes by, but there is so many railroad crossing with the passive level crossing which have not guards. In this study focus on the collision detection system comprised single board computer, LORA communication module, and Image processing machine with HOG & SVM method embedded within it as the cheap and effective solution to tackle such a problem. From Prototype testing with a 20% confidence threshold, the outcome has 89% true rate for the classification and 53% successful rate of the communication on urban city test condition.

Keywords
railroad crossing, HOG and SVM, Hazard Detection

Topic
Electrical Engineering

Link: https://ifory.id/abstract/UqRrEPyBd4ab

Corresponding Author
Andriyanto Setyawan

Institutions
Department of Refrigeration and Air Conditioning Engineering, Politeknik Negeri Bandung
Jalan Gegerkalong Hilir, Ciwaruga, Bandung 40012
*andriyanto[at]polban.ac.id

Abstract
The tropical climate in Indonesia promises the availability of solar energy year-round. However, the utilization is very limited. This paper discuses an experimental investigation on the use of solar energy for supplying a refrigeration machine using an AC mini freezer with power input of 85 W supplied by 200 Watt-peak solar panel. The experiment was carried out in Bandung, Indonesia, and showed that the average energy density of solar radiation is 445 W/m2 while the average output of the panel is 106.4 Watts. The daily average energy supplied to the battery is 1182 Wh, sufficient for continuous operation of the freezer in 13.9 hours. If the machine has an on/off cycle with a usage factor of 56.8%, as in the experiment, the energy could operate the machine within 24.4 hours.

Keywords
solar power plant, refrigeration, solar radiation

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/dzPn7LmUac8y

Corresponding Author
Pairin Pairin

Institutions
a) IAIN Kendari
*syahrul.stain[at]gmail.com
b) IAIN Kendari
c) IAIN Kendari
d) IAIN Kendari
e) IAIN Kendari
f) Universitas Halu Oleo

Abstract
This article aims to provide an overview of: 1) online learning practices at IAIN Kendari; 2) video tutorial design in learning at IAIN Kendari; 3) the use of blogs as a means of online learning. The study was conducted qualitatively, where data was collected through observations, interviews, and study of learning documents. The results showed that: 1) learning practices using online media such as video tutorials and blogs were only carried out by a few lecturers; 2) video tutorial design contains learning material on several subjects that require repeat views; 3) the use of blogs as a means of online learning is still low, this is related to the low technology literacy of lecturers at IAIN Kendari.

Keywords
Laboratory; Online Learning; Technology Literacy

Topic
New Technologies in Education

Link: https://ifory.id/abstract/CMajnz3TFvDR

Corresponding Author
Ekananda Sulistyo Putra

Institutions
Electrical Engineering Departement, State Polytechnic of Malang. Jl. Soekarno-Hatta No. 9, Malang 65141, Indonesia.

Abstract
Electrical energy is an important component in an industry, that is needed by electrical equipment / machines that exist in the industry. Currently, the majority of electrical energy is produced from fossils. Therefore, efficiency application of electricity loads in industries need to be logged and analyzed. To make electricity load efficiency possible, it can be done by monitoring and logging real-time electricity loads in the industry. So that, the electrical power consumed can be analyzed. In this paper, a 3-phase electricity monitoring system is builded for Low Voltage Power Distribution (LVDP) that can be monitored anytime and anywhere via internet for the needs of electricity quality analysis. Monitoring parameters are voltage, current, real power, apparent power, power factor, IHD voltage and current, and voltage and current THD for each phase. That variables send to database and display on the web. Error reading of voltage sensor is found on average error 0.00254% compared to multimeter. For current sensor, the average error is 0.0074%. On the user interface, all functions are running well, so that, it can be utilized for the needs of electrical analysis, which means the power consumed and the malconsumed can be known.

Keywords
Data Logging; Monitoring; Power Quality; LVDP

Topic
Electrical Engineering

Link: https://ifory.id/abstract/RUPp9ybdkXwE

Corresponding Author
Kalih Trumansyahjaya

Institutions
Department of Architecture, Gorontalo State University, Gorontalo, Indonesia

Abstract
Based on an empirical analysis, this study examines model of the effect of strategy and tactics on effectiveness of construction projects implementation process. Using ten variables that have been presumed by reseachers to be determinants of strategy and tactics that will affect on effectiveness of construction projects implementation process. Data is drawn from the survey responses of project in the construction, and public service. This study supports the idea that a strategy and tactics are critical success factors in the construction projects implementation process. In additions balancing strategy and tactics are needed so that construction projects will be effectiveness.

Keywords
strategy, tactics, effectiveness

Topic
Civil Engineering

Link: https://ifory.id/abstract/R3v9HgbG7eYN

Corresponding Author
Tina Mulya Gantina

Institutions
a) Energy Conversion Engineering – Politeknik Negeri Bandung
Jl. Gegerkalong Hilir, Ciwaruga, Bandung 40012, Indonesia
*tina.gantina[at]polban.ac.id

Abstract
Brown coal (lignite) is a type of coal which possesses the lowest energy density relative to any other types of coal such as bituminous and anthracite. Its abundance, various usage, and relatively cheaper price is some of the many profitable traits for it to be used as an energy source for many industries. Because of the composition of the chemical compounds contained in lignite, harmful environmental impacts may arise along with the process of converting its energy through direct combustion processes. Its high water content along with low carbon content cause higher greenhouse gas emissions to be produced. However, the technology of using lignite as fuel does not only come in the form of direct combustion, a process called biosolubilization utilizes the role of microorganisms to convert solid coal into liquid fuel/chemical compounds while still producing environmentally friendly byproducts. This technology provides the opportunities to reduce the impact of pollutions caused by direct combustion and increase the utilization of lignite as a raw material for the production of liquid fuels without the involvement of thermal, physical and/or chemical processes. Studies found that lignite has a considerable abundance in Indonesia. In brown coal, the types and composition of aromatic compounds contained within it will affect the resulting compounds produced from the solubilization process. The more complex the chemical structure between aromatic compounds, the more difficult the solubilization process will become. Lignite, however, contains simpler aromatic compounds, a condition which optimizes the process. The opportunity to develop preparation techniques to obtain optimal biosolubilization results is still likely to be studied. The biosolubilization process involves several important stages, starting from coal preparations, optimizing the enzymatic activity of biosolubilization microorganisms, liquefaction processes, and depolymerization. The process of preparation and optimization of enzymatic activity has been widely carried out, the biggest opportunity for the development of biosolubilization techniques is the yield optimization within the process.

Keywords
lignite, biosolubilation, aromatic composition, enzymatic activity

Topic
Chemical Engineering

Link: https://ifory.id/abstract/Du2V4J6mrANj

Corresponding Author
Iswandaru iswandaru

Institutions
Universitas Islam Bandung

Abstract
Mining activities related to excavation or landfill will always face problems with slopes, both in the form of working slope and final slope, in addition the groundwater factor in the rock layer increases the burden by filling pores and reducing friction inter-grain influences the slope stability. The slopes must be analyzed for stability to prevent landslide hazards because they involve work safety, equipment safety, and smooth production. PT. XYZ is a coal mining company located in Sungai Lilin, South Sumatra, planning to optimize and stabilize the final slope to a depth of 120 m. Geotechnical drilling has been carried out as many as 3 points with a total depth of 270 m and 80 samples of rock and soil testing. The results of slope modeling using the Limit Equilibrium method, mining can be done up to a depth of 120 m with an angle of 30o and 35o with a dewatering system.

Keywords
Excavation, Optimization, slope stability, Limit Equilibrium Method

Topic
Mining Engineering

Link: https://ifory.id/abstract/mdn9JtaehVXE

Corresponding Author
Ade Andri Hendriadi

Institutions
a) PTK Universitas Pendidikan Indonesia
b) Faculty Of Computer Science, Singaperbangsa University

Abstract
The effectiveness and optimization of financial services is one of the things that happens when there is financial technology or fintech. Various fintech services have a strategy to attract customers. One of the strategies is to offer promos to potential customers or early customers. Promos given to customers will provide maximum benefits when they use accurate type of promo on a promo provided by fintech services. Knowledge of various fintech services and a lot of promo information will provide an effective alternative for customers to use promos. For this reason, applications or software have been developed to provide information on various e-money and e-wallet services and promos. The method used is Lean UX which consists of 4 stages namely declare assumpts, Develop MVP, run experiments , feedback and user research. The result obtained on this research is a mobile android application that can display fintech and promo information. Lean UX development is done with 2 iterations and produces features that are validly needed by the user but still need development in terms of User Experience. In the development of fintech management which is devoted to assisting in the management of TVET finances, it is necessary to manage rules in accordance with financial management policies in TVET education.

Keywords
Financial Technology, Fintech, TVET

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/8qpdreDQ42kH

Corresponding Author
Deni Mulyana

Institutions
Mechanical Engineering Departement, Politeknik Negeri Bandung
*deni.mulyana[at]polban.ac.id

Abstract
The fishing ship propulsion system will affect the performance of the ship and impact the fishermens income. A crucial factor is the level of efficiency produced by propellers mounted on fishing vessels. In B-series propellers, propeller efficiency can be optimized by varying the size of the geometric dimensions. This propeller optimization process can be done after the ship resistance value is known. In Cirebon waters, as in other regions in Indonesia, the selection of propellers by fishermen is still unclear. Most are only based on the availability of goods on the market, without looking at how big the actual ship resistance occur. In this research, one of the fishing boats that will be built will be chosen to estimate the ships resistance, after that by considering the engine used as its driving source, the geometry dimensions that can produce the highest efficiency are sought. Estimation of ship resistance is sought by the Holtrop method and propeller optimization is carried out with the help of software. From the results of this study, the value of ship resistance commonly used by Cirebon waters fishermen is 2.608 kN at an operational speed of 7 knots. Optimized propeller design provides a 6 percent increase in efficiency compared to previously used propellers.

Keywords
b-series propeller, optimization, efficiency

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/BLuZ8zeK9WH6

Corresponding Author
Ratu Fenny Muldiani

Institutions
Politeknik Negeri Bandung
Jalan Gegerkalong Hilir Ds. Ciwaruga 40012 Bandung Indonesia
*ratu.fenny[at]polban.ac.id

Abstract
The results of Charles Gay-Lussacs law experimental tools at Polban Applied Physics Laboratory show the pressure value of 1.027 x 10^5 Pa with relative uncertainty value of 11.1% and the number of moles in a flask of 12.47 mmole with relative uncertainty value of 24.3%. The experimental data has relatively low accuracy. In this study, Charless Law experimental tools were optimized by a measured temperature correction on the capillary pipe using the conduction concept. The heat distribution equation that occurs in capillary pipe was solved by numerical solutions using the finite difference method. The modification of Gay-Lussac-s Law experimental tools to get fixed volume was located on the manometer integrated with a glass flask. Data collection techniques were carried out in two different circumstances, namely when the system is experiencing heating and cooling, then compared. After temperature correction, it was obtained that pressure value 0.977 x 10^5 Pa with relative uncertainty of 5.7%. After using integrated manometer and data collection techniques when cooling, the number of moles in the flask was 21.5 mmole with relative uncertainty value of 6.2%. With the correction of temperature in the capillary pipe and the volume maintained provides more accurate experimental results.

Keywords
Laboratory Experimental, Gay-Lussac-s Law, Charles-s Law, Temperature Correction, Integrated Manometer

Topic
Basic Science in Engineering Education

Link: https://ifory.id/abstract/nXBqvAtj9x8b