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The hydrogen production was studied using Scenedesmus sp. by PHM-S media under anaerobic and photosynthesis process. The Investigated of hydrogen gas using by Natural Gas Analyzer (NGA): HP (Hewlett Packard) 6890 with a molecular sieve 5A (CH4, O2. N2, H2) a thermal conductivity detector is used in a mesh-packed column. The results show highest value of hydrogen production in second experiment. It was obtained because the second experiment had longer for incubation time so the photosynthesis process was took longer then algae could produce more hydrogen gas. Interestingly, the hydrogen does not produce within a certain timeframe. We believe that this was related to the reaction enzymatic in algae that was mostly induced by the oxygen, an inhibitor of the hydrogenate enzyme, was reduced during anaerobic adaptation, resulting in an increase in hydrogen production.

Game merupakan salah satu perkembangan yang sangat pesat dalam bidang ilmu komputer. Game tersebut merupakan salah satu bentuk aplikasi edukatif yang artinya dapat digunakan sebagai media pembelajaran yang dalam prosesnya dapat diselesaikan melalui konsep pembelajaran dan game. Game edukasi Quiz ini diberinama “SmartQuiz ini adalah salah satunya. Dalam permainan tersebut, orang tua dapat mengajari anaknya bermain sambil belajar memahami pegetahuan anak dalam game ini. Game edukatif adalah alat pembelajaran dengan tujuan tertentu. Pada aplikasi ini pengguna akan diberi pertanyaan tentang ilmu pengetahuan umum, sehingga pengguna dipaksa untuk berfikir dalam menjawab pertanyaan tersebut.Kebanyakan game edukasi mirip dengan menjawab pertanyaan. Dalam game ini, pengguna harus menjawab pertanyan-pertanyaan yang tersedia, dan hasil akhirnya adalah skor yang didapat pengguna. Pada penelitian ini metode Linear Congruential Generator dipilih karena merupakan metode pengacakan yang lebih baik, atau dapat dikatakan cocok untuk pengacakan soal, dengan waktu eksekusi yang cepat dan tidak membutuhkan waktu yang lama untuk pengacakan

The purpose of this study was to develop a model of a student's final project recommendation system by applying the Collaborative Filtering (CF) method. Agile Development Methods (ASD) is used in software development where this method is widely used for software development because it can produce system requirements data that is more descriptive and easy to implement into software. After going through the process of completing this research, the results of this study; 1) In knowing the topic or research theme in the final project, students with an expert system can be seen from the themes and sub-themes and valid calculations are carried out in helping students to find out the research title for the final project quickly, 2) By applying the Collaborative Filtering (CF) method ) in detecting research topics or themes at AMIK Indonesia, it can produce valid calculations that are the same as manual calculations so that the selection process can be carried out quickly and accurately, 3) In designing this application, it consists of the main menu page, a list of research topics, FAQs and about applications with using the programming language PHP, ReachJS and MySQL as data processing in the recommendation of the student's final project, and 4) The test is carried out using Mean Absolute Error (MAE), root-mean-square error (RMSE), Recall Value, and F-Measure. The results of the test evaluation show that the Collaborative Filtering (CF) method is quite accurate with the resulting recommendations.

Scheduling is the activity of planning in conducting activity at a certain time. The main objective of the scheduling is to improve the effectiveness and the efficiency of the use of resources so that progress that has been determined previously achieved well. A genetic algorithm is one of the most often algorithms used in optimization scheduling. This algorithm works based on a natural process carried out using heuristic methods. One of the scheduling problems at company x in the step to increase security through system security updates with this antivirus installation program involves all employees as users of each division and handled by the IT team as the pic that handles the program. Scheduling is still compiled manually so that raises some of the problems starting from the preparation process to the division of the schedules to require a long time, it usually tends to clashes between the hour and the day when the PIC handles the user due to not automatic scheduling. Therefore, designing an application system by using web-based programming is conducted waterfall method to ease in the process of the preparation and distribution of a schedule which is more systematic with the implementation of the method of the genetic algorithm so that the scheduling that there will be more optimal.

Pigeons are very close to human life, therefore doves are often pets or livestock. Caring for pigeons because of their uniqueness and care is not that difficult. Care that is not so difficult is not that doves are immune to chicks. Many people do not know how to treat pigeons with disease first. Therefore we need advice from experts on pigeons to treat the disease. Because the disease in pigeons can attack humans, it must be treated first. To overcome this problem, an expert system was built which was equipped with 10 diseases and 33 symptoms obtained from experts or experts. The Naïve Bayes method is a simple classification method which results in a probability value for each disease that appears. This system is made with the advantages of a user friendly display on the gejela selection page. The final result of the diagnosis is according to the first treatment method before being taken to the vet, using a web-based system which can make it easier for users to get information for disease diagnosis in pigeons.

This review paper discusses the complete evolution of free-space optical (FSO) communication, also known as unguided optical communication (UOC) technologies, all the way back to ancient man’s fire to today’s machine-learning-supported UOC systems. The principles, significance, and developments that have happened over the past several decades, as well as installation methodologies, technological limitations, and today’s challenges of UOCs are presented. All the subsets of UOC: FSO communication, underwater optical wireless communication (UOWC), and visible light communication (VLC), with their technology/system developments, potential applications, and limitations are reviewed. The state-of-the-art developments/achievements in (i) FSO channel effects and their mitigation techniques; (ii) radio-over-FSO techniques; (iii) wavelength division multiplexing and sub-carrier multiplexing techniques; (iv) FSO for worldwide interoperability for microwave access applications; (v) space optical satellite communication (SOSC); (vi) UWOC; (vii) photoacoustic communication (PAC); (viii) light-fidelity; (ix) VLC; (x) vehicular VLC (V2LC); and (xi) optical camera communication are reviewed. In addition, the current developments on emerging technologies such as artificial intelligence (to improve the performance of UOC systems), energy harvesting (for the effective utilization of UOC channels), and near-future communication network scenarios (mandatory for secured broadband digital links) are covered. Finally, in brief, to achieve the full potential of UOC systems, challenges that require immediate research attention are summarized.

General elections are basically still carried out conventionally, namely by using paper media in voting. This will lead to weaknesses in the calculation of votes such as a waste of money and time. This study aims to develop a website-based e-voting information system in the general election for the chairman of the RW which is expected to minimize the weaknesses of conventional elections. This system was developed to make the voting process more efficient and easy to use. This application is designed using the PHP programming language and MySQL database, using the waterfall method. By doing black box testing, it is hoped that the e-voting system can run well functionally without any error, and dummy variable testing to determine the influence of voters in selecting candidates based on graduation rate

Electronic health (E-health) uses information and communication technology including electronics, telecommunications, computers, and informatics to process various types of medical information, to carry out clinical services (diagnosis or therapy). Health is the most important asset in human life, therefore maintaining health is a top priority and serious attention needed. Heart rate and body temperature are vital signs that the hospital routinely checks for clinical signs and are useful for strengthening the diagnosis of a disease. In this research monitoring heart rate and body temperature with the wireless sensor network (WSN) method that uses NodeMCU 1.0 as a controller module and wireless as communication between nodes, the wireless network used in this research Wi-Fi network. As a data taker, a DS18b20 temperature sensor and a heart rate sensor (pulse sensor) are needed, which will be displayed by the ThingSpeak web and smartphones. From the test results, the success rate of the system in detecting heart rates is 97.17%. Whereas in detecting body temperature the success rate of the system is 99.28%. For data transmission, the system can send data smoothly at a maximum distance of 15 meters with a barrier.

Microsoft PowerPoint is an application that is often used in presentations because of the ease of operation. Even so, users are still required to adjust the presentation manually such as starting a slide, continuing to the next slide, returning to the previous slide, and so on by pressing the keyboard button. Often, it is difficult for users to reach the computer while doing a presentation in front of many people and it will certainly take time. The purpose of this research is to reduce physical contact between users and computers by using voice instead of keyboard commands to operate the presentation so that it is more effective. This research implements the Hidden Markov Models base of Microsoft Speech API in C# programming language. The tolerance level of word pattern changes approaching the original word is 84.29% and the accuracy of the program running in the clear background is 100%. Users can use the application with a microphone or the like as input that is compatible with their computer., Microsoft PowerPoint merupakan aplikasi yang sering dipakai dalam presentasi dikarenakan kemudahan pengoperasiannya. Meski begitu, pengguna masih diharuskan untuk mengatur jalannya presentasi secara manual seperti memulai slide, meneruskan ke slide selanjutnya, kembali ke slide sebelumnya, dan sebagainya dengan menekan tombol di keyboard. Sering kali, sulit bagi pengguna meraih komputer saat sedang melakukan presentasi di depan orang banyak dan tentu akan memakan waktu. Tujuan penelitian ini adalah untuk mengurangi kontak fisik antara pengguna dengan komputer dengan menggunakan suara sebagai pengganti perintah keyboard untuk mengatur jalannya presentasi sehingga lebih efektif. Penelitian ini mengimplementasikan Hidden Markov Models dasar Microsoft Speech API dengan bahasa pemrograman C#. Tingkat toleransi perubahan pola kata yang mendekati kata asli adalah 84,29% serta akurasi jalannya program dalam latar suara jernih adalah 100%. Pengguna bisa menggunakan aplikasi dengan mikrofon atau semacamnya sebagai input yang sesuai dengan komputer mereka.

The development of technology in this era of globalization is growing quite rapidly, one of which is a multi-functional device that is often used today is a mobile application as a medium for accessing information easily. PT. Pegadaian (Persero) is a credit institution that distributes credit on a legal basis for pawning. In the pawnshop line, Pegadaian can receive gold, electronic, and vehicle pawn services. For vehicle pawning, the validation process based on the condition of the car is still done manually using a checklist document, therefore the application is made using the Android Studio programming language to digitize the vehicle pawn process at Pegadaian which is designed using the Software Development Life Cycle (SDLC) method.

Forest fires are a phenomenon of natural disasters that often occur in Indonesia and are a local and global concern. Forest fires that occur today are caused by two main factors namely natural factors and uncontrolled human activity factors. Therefore in this research is to find ways to reduce forest fires that often occur today. Therefore, a fire detection system with dual sensor based wireless sensor network based with Sugeno FIS (Fuzzy Inference System) algorithm is designed that can be accessed through the Internet network. The purpose of this research is to create a forest fire monitoring system for a wide area of fire-prone areas using WSN (Wireless Sensor Network). In this study also used the FIS (Fuzzy Inference System) method as a method of decision making with mathematical calculations that can improve accuracy in the fire detection system so that the output of this method is the level of fire status. Internet of Things technology is also used so that information can be received by users in real-time through the Internet network. Based on the test results on the system that has been designed, Sugeno FIS (Fuzzy Inference System) calculations on SN1 and SN2 have 100% accuracy when compared to manual calculations. The average speed of sending data on SN1 is 1.67 seconds and on SN2 is 1.52 seconds. Testing the detection status of the fire sensor with a distance of 10 to 100 cm has results that correspond to a predetermined threshold.

In order to connecting villages in rural area with a city, a hybrid optical communication is proposed. The Optical fiber communications that are implemented as a backbone on the Palapa Ring network has an opportunity to be expanded to reach rural area through the implementation of free-space optical communications (FSO) as the optical relaying networks (ORN). The major problem of FSO as the ORN is turbulence effects induce an optical propagation. In this research, FSO as the ORN implements novel technique to improve the performance of hybrid FSO where the amplification of signal is produced through serial configuration of optical amplifiers in cascaded meanwhile to reduce the noise in the end of receiver, optical band pass filter is implemented. The simulation of hybrid FSO is performed in Optisystem 7.0 where ORN is implemented in two nodes. The length of optical fiber connection to FSO is set to be constant at 75 km. The range of optical propagation in FSO is set at 1–9.4 km. The results of simulation show that at the range of 1–8 km of optical propagation under atmospheric turbulence, range values for SNR and BER are achieved at 46.23–26.61 dB and 6.7x10-17–1.5x10-6, respectively.

OTA shoe store is a shoe shop that sells local Indonesian shoes. But this shoe shop still carries out a sales system that is still very simple and inefficient, including transaction processing, recording shoe stock, and in making sales reports. This is the author's reference in designing a sales information system at the OTA Shoe Store. This system is designed using Sublime Text software with HTML, CSS, and PHP as the programming language, while for the database it uses MySQL. The design of this system is assisted by the Waterfall design method. The purpose or intent of this research is to design a cashier information system that can assist cashiers in processing transactions and can provide information to cashiers about the stock of shoes available in the warehouse. This information system can also help cashiers as admins in recording stock of goods based on the perpetual method of recording goods and can also make sales reports to be given to shop owners.

The school is a place where the teaching and learning process takes place where the school applies virtual learning, so that students easily feel bored when learning. There are many types of learning, and the problems that arise in the learning process are also diverse. In this study, problems in the learning process were still limited, and the delivery of material provided by the teacher made it difficult for students to understand, thereby reducing student interest in learning. Responding to this situation, the temporary results of the author succeeded in creating a website and doing graphic testing on the website that was created, which only 56 users could access. If there are 100 users accessing the website, the server will be down and the website cannot be accessed by anyone.

Cattle is one of the most livestock products in Indonesia, therefore to increase the yield of Indonesian livestock, the government has created a cattle assistance program that can help local breeders in improving the quality and commodities, especially cows, the priority of the program is local cattle to be able to compete. with other imported cattle. With this program, an application is made that can help realize the program. The application that is made is the Information System for Monitoring the Distribution of Cattle Aid where this application is devoted to monitoring all aspects related to distribution. The Information System for Monitoring the Distribution of Cattle Aid can support government programs according to the specified target. Because this government program is aid, this application will be able to accumulate distribution results so that it can be evenly distributed according to the data of prospective recipients that have been set and algorithms that help in running it. This application is a first fit algorithm that can assist in inputting and determining memory locations that can be used to accommodate and minimize fragmentation. The Cattle Assistance Distribution Monitoring Information System assists users in checking data efficiently in terms of timeliness and data accuracy. This study aims to understand the flow and use of information systems in the monitoring and distribution section, the method used to design and create an Information System application for Monitoring the Distribution of Cattle Aid is by observation and document study. The application of this information system monitoring the distribution of cattle assistance has had a good impact on the development of livestock, coupled withsophistication technological and assisted farmers in increasing input and development of livestock in the distribution sector.

Sinar Adventure Store is a shop that provides camping equipment, this store has many customers who want to rent camping equipment such as tents, carril bags, stoves and sling bags. But the camping equipment rental transaction at this shop still uses the conventional process, so there are still many errors that occur in writing information and data reports on this camping equipment rental. This is the author's reference in designing a web-based camping equipment rental information system, with HTML, CSS, and PHP programming languages as the database. This system is designed using the waterfall method and the system follows the flow of the Time Charter Party method. In data processing, such as recording rental transaction data, it is still stored in a ledger storage media so that data security is not guaranteed because there is no more searching for camping equipment data at the Sinar Adventure Store who still has to wait a long time because they have to find one data person in the books. The purpose of creating this rental system is to overcome the problems that are currently happening at the Sinar Adventure Store store. The results of this study are to provide convenience in the processing of camping equipment data at the Sinar Adventure Store store such as admin data, data rental, ordering, checkout and to simplify the data search process in addition to having a more effective and larger storage media.

Car rental is a transportation service that offers rental services for vehicles. This business can also help the community or immigrants who need four-wheeled vehicle rental services for various purposes and needs. Car rental currently still uses the bookkeeping method and manually analyzes the data for recording the rental transaction data. Website-based information systems also have an important role in supporting progress in the application of the car rental business so that they can carry out car rental business activities optimally with progress. Website-Based Car Rental Information System is designed using Sublime tools, Notepad++ and uses a MySQL database. The system design method used is First Come First Served, which is a system that is used to make reservations by paying in advance. The method applies a system of advance payment in advance to get this car unit for rent. From this research, the First Come First Served method is very beneficial for the admin because if there is no rental status payment, it will be taken by other users with the desired car unit.

Discipline is one of the significant points in building education, especially at SMP NEGERI 20 DEPOK. The school picket officer is tasked with processing books, second recording student attendance, student permits, and student performance reports at SMP Negeri 20 Depok. Computer-based information systems also have an important role in supporting the school to carry out teaching and learning activities optimally. The Picket Officer Daily Report Information System is designed using Sublime Text 3 tools and uses a MySQL database. While the programming languages used are HTML, CSS and PHP using the waterfall method which will take data from SMP Negeri 20 Depok. Based on the retrieval of information carried out, the Daily Report Information System is designed to assist the processing of all student activities such as student attendance, student permits and student performance reports. The Picket Officer report information system helps process data efficiently and maximally both in terms of time and materials used, where so far the daily reports of picket officers at SMP Negeri 20 Depok are still done conventionally.

Leo futsal is a business that provides facilities for futsal sports that was established in 2019. The high interest in every day makes Leo futsal overwhelmed because the futsal field rental system is still conventional where customers still have to go to the location to check the schedule the field is still vacant or the customer contacts the managers' WhatsApp to find out the available fields and to notify the field tenants if the rental time has run out, the field manager must look at the wall clock several times. That's what made the writer decide to design a website-based futsal field rental information system with the aim of making it easier for field managers and making it easier for customers to see the empty field schedule. The researcher designed the futsal field reservation information system using the first come first served method with the system development method using the waterfall method.

Every electronic device requires a good power supply so it perform functionally needed. Many devices use electrical energy. Starting from a laptop or computer device, TV, AC, refrigerator, cellphone, lights all use electric power. Even in every agency or company requires electrical energy for work activities to be more optimal. UPS (Uninterruptible Power Supply) itself is very useful for protecting electronic devices from blackouts that can occur at any time. This tool stores electrical energy such as battery and re-flows it, so that devices such as computers are not damaged. By using the calculation algorithm method TOPSIS (Technique For Others Reference by Similarity to Ideal Solution) and SAW (Simple Additive Weighting) in making the best UPS quality decisions in terms of quality of goods by considering the quality of weight with the following criteria: Price, Capacity (VA), Capacity (Watts) and Runtime at 60W (min).

Indonesia has entered the stage of digital era where the trend of internet users as well as activity for online transactions has grown significant in the last 5 years. Meanwhile, the demographic population of Indonesia has shown major problem where the distribution of occupants are concentrated in main islands and villages or rural areas. This condition rises problem of connectivity as well as to provide equal information access to all citizen through out the islands. For this reason, government of Republic Indonesia has setup the Palapa Ring Network that is designed to connect all provinces and cities. However, the problem of connectivity still does exist since the Palapa Ring Network has a space or barrier for reaching the last mile access or users in the villages or rural areas. In concerning those problem, a scheme of optical relaying network that uses full-duplex of free-space optical (FSO) communications is proposed in this research as one of the solution to connect city and rural areas. Full-duplex of FSO implement two channels of wavelength division multiplexing (WDM) that capable carry 20 Gbps. The finding of the research is the length of optical propagation that is supported by two nodes transmission for each hop can be expanded into 4-6.25 Km where the performance of SNR is at the range of 42.92-33.179 dB and BER is at the range of 2.3×10−9 −3.5×10−8.

In this chapter, the main contribution by proposing the OSF as the detection method in FSO is producing an optical method that capable to filtering noise and minimizing scintillation in real time where these advantages are accordance to the benefit of FSO as the low cost platform of telecommunication. The OSF-detection method capable to solve the weaknesses of DD method where spatial noise, beam wander and scintillation as the results of turbulence effects can be suppressed optimally before the signal detected by PD. The OSF detection method also can solve the major problem in optical amplification using Erbium-doped fiber amplifier (EDFA) where beam wandering can cause the loss signal that should be coupled into the stage of amplification process. Thus, implementing the OSF as a detection method in FSO brings significance for the improvement of performance.

In the last decade, coherent narrow linewidth optical system technology has contributed to reaching a new generation called high-speed optical communication. This technology has improved the transmission capacity of long-haul fiber optic transmission systems. State of the art in the market is a bit rate up to 100 Gbps per channel, where in one fiber optic can be traversed by 80 channels or 8 TB per fiber. The main key of the high-speed transmission is narrowing the laser linewidth which will increase the laser coherency. Some techniques have been proposed before such as the use of quantum well structure, distributed feedback braggers and application of external cavity resonators that have been able to narrow semiconductor linewidth lasers. In this paper we make a theoretical analysis to attempt for narrowing the linewidth semiconductor laser with laser current injection control. We intend the application of narrowing linewidth technique for the free-space optical communications in the case of visible light communication where the demand of laser source with narrower linewidth of signal is one of the key to improve the performance. The analysis is performed based on Schawlow-Townes equation. We prove that increasing the current injection twice causes linewidth constriction twice. The analysis and simulations are performed using Optiwave software.

Cocoa is one of the many plantation products in Indonesia which has considerable economic value, and has plantation land and its production each year has increased significantly. The lack of agricultural extension experts in providing direction, guidance, and information dissemination about the development of cocoa plant diseases faced by the cultivators of these plants can have an impact on the cultivators. The method used in this research is the forward chaining and naïve Bayes method. This system is expected to be useful for users in diagnosing cocoa diseases independently, of course easily and efficiently without having to require experts in their fields, with reference to the results and discussions carried out, the accuracy of this system has an accuracy value of about 95% in carrying out the diagnosis

Soil moisture is needed in rice fields for plant growth, with attention to soil moisture in rice fields, it can increase fertility in the land which impacts existing plants. But in regulating soil moisture requires a level that is following the existing plants, because each plant has different humidity settings. This research will design a tool to adjust soil moisture in rice fields automatically to maintain soil moisture according to plant needs. This tool is designed to use a Soil Moisture sensor which can later be used as input data to the ESP8266 to drive a Servo Motor as a soil moisture regulator, a Servo Motor as an irrigation door drive. In making the design of irrigation arrangements, moisture data from each plant is needed because each plant has a different moisture content, from the results of the study, it was found that the soil moisture of kale plants was ± 49% - 68%, and soil moisture of corn plants ± 48% - 63%.Keywords:Automatic Watering, ESP8266, Soil Moisture Sensor.

Focal-spot wandering is the main cause for the major power loss in free-space optical communications. Thus,mitigating it is a primary requirement for the successful performance improvement. In order to prove this prerequisite, an experimental set-up using 155-Mbps data transmission is built for the link range of 0.5 km at an altitude of 15.25 m. In the experiment, the receiver is equiped with a control system to stabilize the received optical propagation at the detector plane which is called as focal-spot wandering mitigation control so as to couple the power in bucket perfectly to the photodetector. The performance improvements due to mitigating focal-spot wandering are regressively investigated in terms of various quality assessment key parameters. Maximum radial distance of 0.25 mm, maximum effective scintillation index of 0.17, optical signal-to-noise ratio of 9 dB, minimum eye-opening of ±0.37 V, minimum eye-height of ±0.51 V, controlled bit-error-rate of 6.45 × 10−9 to 7.09 × 10−8 and the li...

At this time, information and communication technology is growing rapidly. One example of technological developments is Augmented Reality (AR). Augmented Reality in theory is to present virtual effects in the real world. This AR technology has been applied in several fields. One of them is in the field of education. In this study, an AR application was made as an educational medium for the history of the heritage buildings of the Ottoman Empire, especially for Madrasah students in the subject of Islamic Cultural History (SKI). This research will discuss the history of heritage buildings of the Ottoman Empire such as; Hagia Sophia Monument, Yeni Valide Mosque, and Blue Mosque. The Ottoman Empire was one of the world's Islamic empires that played a major role in the spread of Islamic teachings. This AR application uses the Marker Based Tracking method and the Fast Corner Detection algorithm. The tools used are Android Studio, Unity 3D, Sketchup, Figma, and Vuforia. The results of this study resulted in the application having succeeded in displaying a 3D Object from the Ottoman Sultanate heritage building, along with a description next to the 3D Object. In addition, this Monument AR application also works well on the Android operating system.Keywords:Augmented Reality, Marker Based Tracking, Fast Corner Detection, 3D Object, Android.

Many person or institutions are still not aware of security on a server, not only rely on IDS and IPS applications and some firewall applications that we can easily find through internet networks. Special security handling is required on servers that are not related to third-party applications. The security design can be implemented through kernel configuration and tweaks that can be done by relying on the default application of an operating system. These applications are very common and can be found in almost all types of Linux server distributions. And there are still many people who do not maximize the security provided by the BIOS (Basic Input Output System) so that the operating system that has been installed and the data stored therein can be easily accessed by parties who are not responsible. Than as a preventive measure so that the data stored can not be accessed haphazardly by people who are not responsible, provided encryption and the sharing of system files that will be installed on the server. In the security steps for account access, the password that is created will be expired and the user cannot use the old password that he has used before

Container-based virtualization is very popular among programming development in a lightweight virtualization because where the Linux kernel can divide resource-using containers to prevent uninterrupted performance between And as a burden divider in tackling the many incoming bandwidth. One of the most commonly used container-based virtualization is Docker. Docker itself is an open source software that can be changed to your liking. Docker containers can be used for clustering Web servers. It aims to reduce "a single point of failure" (SPOF) in a Web server. However, arranging a lot of containers is very complicated, but Docker has an engine to set it up called Docker Swarm. With it in the NGINX management help so that it can cause the resource between hosts is not divided on average. Therefore the research aims to distribute Web server traffic across the host with loadbalancing based on time-based monitoring and failover resources. By winning the low resources or resources used by Docker in the operation of an application that can be virtualized only what is needed

Saat ini penggunaan smartphone sangat masif di seluruh dunia, khusus nya android . Fitur yang dimiliki sangat mudah dipakai, namun sebagian orang tidak mampu untuk menggunakan secara maksimal fitur-fitur yang ada karena membutuhkan waktu untuk berinteraksi dengan fitur tersebut, salah satu teknologi yang dapat dimanfaatkan untuk mengoptimalkan android , yaitu voice recognition namun teknologi yang sudah dikembangkan oleh vendor membutuhkan koneksi internet untuk dapat berjalan, untuk sebagian user yang tidak terdapat jaringan internet tidak bisa menikmati teknologi tersebut, untuk dapat mengatasi masalah ini dibutuhkan aplikasi personal assistant yang dapat digunakan ketika tidak ada koneksi internet sekalipun, ide yang didapat dari penciptaan aplikasi ini adalah untuk menyempurnakan kekurangan dari penelitian sebelumnya, dengan ada nya teknik Natural Language Processing ( NLP ) mempermudah dalam proses pembuatan aplikasi ini, aplikasi sudah diuji dengan serangkaian tes dan hasil dari tes tersebut menunjukkan bahwa instalasi dapat dilakukan di versi terbaru yaitu android 10 dan 10 dari 12 perintah yang diuji berhasil dilakukan dengan rata-rata respon selama 0.054 detik. Semua fitur dapat dijalankan tanpa perlu koneksi internet.

In the last decade, the coherent technology of narrow linewidth optical system has contributed to achieving a new generation called high speed optical communication. This technology has improved the capacity of transmitting long-haul fiber optic transmission systems. State of the art in the market is the bit rate up to 100 Gbps per channel, where in one fiber optic can be traversed by 80 channels or 8 Tbps per fiber. The main key to high speed transmission is narrowing the linewidth laser that will increase laser coherency. Narrowing Linewidth laser is also widely used for power laser cutting applications, because narrowing linewidth results in reducing chromatic aberration that narrowing of the focal diameter, such that laser cutting becomes more effective. Several techniques have been known previously such as the use of a quantum well structure, distributed Bragg feedback and the use of an external cavity resonator that can obviously narrow the semiconductor laser linewidth. In this paper, we make a new theoretical analysis to narrow the semiconductor laser linewidth by controlling laser current injection. The analysis is performed based on the Schawlow-Townes equation and its new revision. We prove that by increasing current injection causes narrowing of the linewidth. The analysis and simulations are performed using Optiwave software.

We propose an optical spatial filter (OSF) method to suppress beam wander and spatial noise effects. Signal from random displacements of the focus spot around the optical axis within the constricted area is collected. This method advantageously suppresses fluctuations in signal intensity. The OSF consists of a pinhole and cone reflector. The pinhole produces Fresnel diffraction on the focus spot. The cone reflector provides directed reflectance onto the pinhole for random focus spot displacements due to beam wander. The calculations of signal power are based on fluctuations of signal intensity that are minimized by the circular aperture function of the pinhole and the cosine of the reflectance angle from the cone reflector. The method is applied to free-space optical communications at a wavelength of 1.55 μm with an atmospheric chamber to provide optical propagation media. Based on calculations, the beam wander angles that can be received by the OSF are from 14.0° to 28.0°. Moreover, based on experiment, the OSF with a pinhole diameter of 20.0 μm and cone reflector diameter of 1.5 mm produces signal power of −15.3 dBm. Both calculations and experiment show that the OSF enhances the received signal power in the presence of turbulence.

Layanan dan data teknologi Cloud Computing tersimpan pada server, hal ini menjadikan faktor pentingnya server sebagai pendukung ketersediaan layanan. Semakin banyak pengguna yang mengakses layanan tersebut akan mengakibatkan beban kinerja mesin server menjadi lebih berat dan kurang optimal, karena layanan harus bekerja menyediakan data terus-menerus yang dapat diakses kapanpun oleh penggunanya melalui jaringan terkoneksi. Perangkat keras server memiliki masa performa kinerja. Hal serupa dengan perangkat lunak yang dapat mengalami crash. Dengan fungsi server yang memberikan layanan kepada client, server dituntut untuk memiliki tingkat availability yang tinggi. Hal tersebut memungkinkan mesin server mengalami down. Server juga harus dimatikan untuk keperluan pemeliharaan. Penelitian bertujuan ini membangun Clustering Server yang dapat bekerja bersama yang seolah merupakan sistem tunggal diatas lingkungan virtual. Hal ini merupakan solusi untuk mengatasi permasalahan tersebut. Pada penelitian ini penulis menggunakan server virtualisasi proxmox, FreeNAS sebagai server NAS dan DRBD untuk pendukung ketersediaan layanan tinggi dalam lingkup HA, sinkronisasi data dalam High Availability (HA) yang dapat melakukan mirroring sistem kemesin lain. Dengan diterapkannya metode HA dan sinkronasi DRBD serta penggunaan NFS (Network File System) pada sistem cluster didapatkan hasil rata-rata waktu migrasi sebesar 9.7(s) pada node1 menuju node2, 3.7(s) node2 menuju node3, dan 3(s) pada node3 menuju node1. Didaptkan juga waktu downtime yang lebih sedikit yaitu sebesar 0.58 ms pada node1, 0.02 ms pada node2, dan 0.02 ms pada node3.

Data dan informasi merupakan hal yang penting dan berharga dalam suatu lembaga atau instansi, oleh karena itu data sangat penting untuk menjaga dan mengelola data dengan baik, apalagi di instansi atau perusahaan yang sedang dalam tahap perkembangan, tentunya hal tersebut perlu dilakukan. Peran private cloud storage merupakan layanan yang terintegrasi untuk meningkatkan keamanan dan mempercepat akses data. Pada penelitian ini digunakan OwnCloud sebagai sharing data gratis dan menyediakan pengamanan yang baik, paltform virtualisasi Proxmox sebagai pelayanan Infrastructure-As-A-Service (IAAS) Cloud Computing yang dapat menyediakan sebuah infrastructure Paltform yang bersifat opensource dan Redundant Array of Independent Disk (RAID) untuk menambah kapasistas disk dan mempercepat pengaksesan data. Dengan diterapkannya Redundant Array of Independent Disk (RAID) pada Infrastructure as a Service (IAAS) didapatkan hasil maksimum pada penggunaan sisi Ethernet0 90.75 Mbps, Memory terpakai 9.65%, dan pada CPU loading hingga 36% saat upload data File 559MB dengan 11 user secara hampir bersamaan. Kata Kunci ̶ Private Cloud Storage, IAAS, Server Proxmox, RAID0

The optical propagation of free-space optical (FSO) communications under the influence of atmospheric turbulence exhibits deterioration of signal spectral. By this nature, fiber-detection method that is implemented in the receiver system frequently, cannot overcome the turbulence effects. In order to improve the fiber-detection method, an optical spatial filter (OSF) that is composed of cone reflector, pinhole and multi-mode fiber is proposed as a detection method. It aims to increase intensity of signal spectral and signal power by suppressing temporal fluctuation. Thus performance improvement of FSO can be achieved by the OSF. The measurements of signal spectral from the OSF are compared to fiber-detection method. The OSF is intalled in rear focus spot of receiver lens before photodetector. The experiment results show significant improvement in suppressing temporal fluctuation in signal spectral from the OSF. (SNR) increases that are 36.5 dB, 37.5 dB, 37.7 dB, and 38.2 dB for D P1 , D P2 , D P3 , and D P4 , respectively. (BER) are produced more lower that are 10−9 to 10−12 by OSF. Those performances improvement is achieved higher by the OSF compared to fiber-detection method. The outcome of this work is recovering signal spectral that is deteriorated caused by turbulence effects modulation into optical propagation. Hence the OSF can be implemented for integrating FSO with optical fiber communication system in order to enhance bit-error-rate and signal-to-noise ratio performances.

Teaching aids for learning to Build Space now still depend on the old way, namely by still using 2-Dimensional media. Teachers such as Teachers still have difficulty making visual tools to learn the material of Building 3 Dimensions. And students still find it difficult to learn and explore the material to Build Space delivered by the teaching staff, with its limitations and lack of visual tools they can only imagine what the shape of the Space Build is like. With that, the author tries to make interactive learning applications so that geometric models such as cubes, tubes, cones, pyramids and balls can foster interest in learning mathematics at elementary school level by utilizing Augmented Reality (AR) technology, which is technology that merge two-dimensional or three-dimensional virtual objects into a real environment and then project these virtual objects in real time. One of the materials in learning mathematics for fifth grade elementary school students is Build Space. If you pay attention to the average age of elementary school students in class V is at the age of 10-11 years. The author obtained the final results of the study in the form of learning to Build 3-Dimensional Space with the Virtual Button method and test results from Smartphone Xiaomi Redmi 4 devices with a minimum distance of ± 15cm and a maximum of ± 81cm. Testing the response speed

In this Digital era, Microcontrollers are now growing rapidly and are increasingly in demand in control system applications. Including Arduino Microcontroller, by using this Arduino trying to overcome a problem that often occurs in the Data Center space, namely the problem of temperature and humidity instability that has a major impact on data on each rack in the data center space. This problem occurs if the temperature is too hot or too excessive humidity which results in overheating so that it can damage data stored in the data center. To solve the problem, Arduino detects temperature and humidity using a DHT11 module that can detect clearly and accurately, and can display on the LCD screen, or display the results of temperature and humidity detection on a webbased Thingspeak application and the Blynk application that can be accessed via a smartphone. Internet-based of Things (IoT). With DHT11 processed by Arduino can produce an ideal temperature of 18 ° C - 28 ° C and humidity of 40.00% - 60.00%, and provide Notifications that will be sent to the blynk application if there are problems with temperature and humidity instability.

At present there are still many government offices, especially the tourism and cultural offices of the Thousand Islands, which do not utilize technology for employee attendance, resulting in frequent manipulation of attendance data. Manual presence can cause the tourism office to have to manually record a large amount of attendance data, and make the process ineffective and inefficient. Therefore, this study aims to discuss the Employee Presence System Design with IoT (Internet of Things) Based RFID Using NodeMCU ESP8266. So this research can facilitate the Department of Tourism for the present system of attendance for employees to be more effective and efficient and does not take much time. This system is integrated with the website so that when the employee makes a presence, the data is automatically saved directly into the website database. Database processing on websites using MySQL with the PHP programming language. From several tests, many types of cards can be read by RFID Reader, because these

Rainbow digital hologram is very potential 3D display media in the next future generation for electronics device. Rainbow hologram method is one of the method which can support this development. Since rainbow hologram records a large ammount of spatial and temporal frequency component from the object that represents as rainbow spectrum, huge information need to be decoded digitally. In this paper, we propose a method for compression method applied in rainbow digital hologram. The compression method is wavelet transform for the recording and reconstruction process that capable to compress an object and fringe pattern digitally. The compression is based on major spectral component on the recording process which are red, green, and blue. This method has benefit among other compression scheme that offers high resolution of the reconstructed image. From the simulation, compression using wavelet in the recording process can reduce the file size to be stored in computer significantly where the score is 73.9 %. The quality of reconstructed image does not degrade siginificant as well where the comparison for compression and uncompression show identical characteristics. &nbsp

Deep Learning is still an interesting issue and is still widely studied. In this study Deep Learning was used for the diagnosis of corn plant disease using the Convolutional Neural Network (CNN) method, with a total dataset of 3.854 images of diseases in corn plants, which consisted of three types of corn diseases namely Common Rust, Gray Leaf Spot, and Northern Leaf Blight. With an accuracy of 99%, in detecting disease in corn plants.

We report an experimental of free-space optical communication (FSOC) system that use tube propagation simulator (TPS) as the turbulence medium. The FSOC system usewavelength of 1550 nm at the rate transmission of 1000 Mbps and amplified with EDFA at the output of +23 dBm. Index structure of 10-15–10-13 as the representation of atmosphere index turbulences are used for simulation of intensity distribution model or scintillation. The simulation use gammagamma and K model as well. The beam wave propagation models used in simulation are plane wave, spherical wave and Gaussian wave. Spherical wave achieves highest performance via gamma-gamma in strong turbulence. While Gaussian wave achieves highest performance also via K model. We also found, characteristical FSOC system performance is calculated more accurately with gamma-gamma method for strong turbulence than K model. The performances from gamma-gamma for strong turbulenceare at 22.55 dB, at 5.33×10-4, and at 9.41 ×10-6.&nbsp

On this preliminary work we employ distributed raman amplifier with pumping schemes are forward- & backward pumping on SMF. The model of simulation and analysis used are multiple-pump interactions on CWDM band. We used four level configuration of pumps on wavelengths; 1435 nm, 1445 nm, 1455 nm and 1465 nm with the range of tuneable power levels are 300 mWatt - 400 mWatt each ones. The average results of Stokes gain measured at L = 0 km and L = 40 km are 17.875 B and -3.5 dB respectively while the noise figure is at the range of 3 dB - 2.5 dB. The maximum length of fiber are reach at L = ~50 km. Two factors found that could decreasing the performances of distributed Raman amplifier are amplified spontaneous scattering (ASS) and Rayleigh backscattering effects. Finally the flattening gains for C band are reached successfully.