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1. Simulating Free-Space Optical Communications to Support a Li-Fi Access Network in a Smart City Concept.

Author

Darusalam, Ucuk, Nathasia, Novi Dian, Zarlis, Muhammad, and Priambodo, Purnomo Sidi

Subjects
FREE-space optical technology, WAVELENGTH division multiplexing, SMART cities, FIBER Bragg gratings, URBAN growth
Abstract

Smart city development has grown rapidly in the decades since 4G and 5G technologies have been released. Moreover, a highly reliable network is required to support the Internet of Things (IoT) and mobile access within a city. Light Fidelity (Li-Fi) technology can provide huge bitrate transmission and high-speed communications. In the research, a backbone based on Free-Space Optical (FSO) communication (FSO) is designed through simulation to provide a Li-Fi access network with a high capacity data rate. The originality of the proposed method is the implementation of double filtering techniques, which gives an advantage when forwarding the signal to a node and improves the quality of the signal received by the Li-Fi. The FSO as the Optical Relaying Network (ORN) is designed with a configuration of 12 channels of Dense Wavelength Division Multiplexing (DWDM) amplified by optical amplifiers in the transmitter and receiver. The signal output is filtered by a Fiber Bragg Grating (FBG) and a Gaussian filter. In the simulation, the ORN has node spacing in the range of 500 m to 2,000 m. Then, the data transmission rate at 120 Gbps is provided by the implementation of DWDM channels to serve as an access network. From the simulation, the FSO backbone can optimally deliver highly reliable Li-Fi access networks. When the nodes are spaced in a 500-2,000 m range, the Bit-Error-Rate (BER) performance is produced at the order of 10-6. [ABSTRACT FROM AUTHOR]

Published
2024
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5. A review–unguided optical communications: Developments, technology evolution, and challenges

Author

Raj, A. Arockia Bazil, Krishnan, Prabu, Darusalam, Ucuk, Kaddoum, Georges, Ghassemlooy, Zabih, Abadi, Mojtaba Mansour, Majumdar, Arun K., Ijaz, Muhammad, Raj, A. Arockia Bazil, Krishnan, Prabu, Darusalam, Ucuk, Kaddoum, Georges, Ghassemlooy, Zabih, Abadi, Mojtaba Mansour, Majumdar, Arun K., and Ijaz, Muhammad

Abstract

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.

Published
2023

9. The improvement of fiber-detection method to enhance the output of amplify-received relaying on FSO communications.

Author

Darusalam, Ucuk, Priambodo, Purnomo Sidi, Zulkifli, Fitri Yuli, and Rahardjo, Eko Tjipto

Subjects
*OPTICAL amplifiers, *OPTICAL communications, *BEAMFORMING, *SIGNAL processing, *OPTICAL modulators
Abstract

The performance of free-space optical (FSO) communications that using an optical amplifier (OA) in the scheme of an amplify-received (AR)-relaying has a major drawback in the detection of input signal quality under the effects of turbulence. As an OA is based on a fiber-detection (FD) method to receive and delivers a signal at the amplification process stage, there is an opportunity to implement an optical spatial filter (OSF) to improve the quality of an input signal. In this paper, as the continuation of previous work on the direct-detection, the OSF is applied on the AR-relaying. The novelty proposed in this work is the improvement of FD method where the OSF is designed as the integration of cone reflector, pinhole and multi-mode fiber with an OA. The OSF produces an optical signal, the input of the OA, which minimizes the effects of turbulence, background noise and signal fluctuation. Thus, OA in AR-relaying produces signal output with high power and rise up below threshold level. Additionally, an OSF with a lower pinhole diameter produces the best quality of the signal spectral to be delivered into an EDFA. Through this implementation, the performance of optical relaying on FSO can be significantly improved. [ABSTRACT FROM AUTHOR]

Published
2023
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20. Battery State of Charge Estimation Based on Internal Resistance and Recovery Effect Analysis.

Author

Wahyuddin, Mohammad Iwan, Darusalam, Ucuk, Priambodo, Purnomo Sidi, and Sudibyo, Harry

Subjects
*OPEN-circuit voltage, *BATTERY management systems, *STORAGE batteries
Abstract

State of Charge (SoC) is a parameter used to determine the current capacity on a battery as well as indicate the operational characteristics. The SoC is an important parameter for optimizing battery utilization in many applications requiring DC current source. However, estimating the SoC value is the major problem since it cannot be measured directly. In this study, we proposed SoC measurement method based on analysis internal resistance of battery. The internal resistance is correlated with the parameters of the magnitude of the terminal voltage and open circuit. Both voltages come from the influence of current during the charging-discharging process. We report that the proposed method has successfully obtained the correlation between the SoC and the internal resistance value for two process, which are the charging- and discharging process. [ABSTRACT FROM AUTHOR]

Published
2022

26. APLIKASI PERINTAH SUARA UNTUK OPERASI POWERPOINT

Author

Ruhiat, Sandy Kurniawan, Darusalam, Ucuk, Benrahman, Benrahman, Ruhiat, Sandy Kurniawan, Darusalam, Ucuk, and Benrahman, Benrahman

Abstract

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.

Published
2021

30. Application of the O-Chat Bot Program to Provide Learning Motivation to National University Students Using AIML: Application of the O-Chat Bot Program to Provide Learning Motivation to National University Students Using AIML

Author

Husein, Muhammad Fikri Haikal, Darusalam, Ucuk, and Aningsih, Andri

Subjects
AIML, Program-o, Chatbot
Abstract

Teaching and learning process raises new problems, some students feel the turmoil in understanding the online-based learning process and the lack of motivation to do the work. With the Chatbot-O Program, students will find it helpful to better understand the online learning process but have not been fully able to build student learning motivation. This study aims to develop to a further stage regarding the Chatbot application to provide motivation to learn at national university students by displaying answer messages based on the questions given. This research uses AIML which is part of the XML set. And also as a language used in composing chatbot logic to understand the input that has been received

Published
2020
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31. Analysis System About Muscle-Bone-Joint Symptoms by the Association Rule Method: Analysis System About Muscle-Bone-Joint Symptoms by the Association Rule Method

Author

Harianto, Rian, Darusalam, Ucuk, and Andrianingsih, Andrianingsih

Subjects
Algoritma Apriori, Data mining, Asociation Rule
Abstract

Muscle, Bone, Joint Problems are health problems in the human body. Problems of muscles, bones, joints felt by almost everyone, both parents, adolescents, and children. Symptoms of muscle, bone, joint problems can be pain in the knee, pain in the shoulder, pain in the neck, pain in the hands, pain in the legs or pain in the back. To categorize the problems of muscles, bones, joints, there are many problems in management reporting to find out the symptoms that often occur in one semester. Based on this it is necessary studies that lead to the creation of a system that can categorize the spread of symptoms in muscles, bones, joints to determine the results of diagnosis based on the pattern of symptoms experienced by patients. So that helps management to find out and get information based on the pattern of symptoms that occur in patients. One alternative to the problem, this study we make a search pattern or association rule association (associative rules) of large-scale data and is very closely related to data mining that can be used to find certain rules that associate data with one other data with a priori algorithm method. The purpose of the method is to search historical data to identify data patterns based on previous characteristics to determine the disease diagnosis. So that the information generated can be used by management to provide appropriate diagnostic information according to the natural pattern of symptoms by the patient.

Published
2020
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32. Application of IP Security and Mac Address Filtering Authentication Methods to Build Encrypted Interconnection Networks: Application of IP Security and Mac Address Filtering Authentication Methods to Build Encrypted Interconnection Networks

Author

Putra, Mochamad Akbar Fajar Hidayat, Darusalam, Ucuk, and Aningsih, Andri

Subjects
Authentication, Mac Address Filtering, Security, IP Security, Interconnection
Abstract

The development of the industry is happening very fast, Making the company must improve its resource capabilities, one of which is the technology used to be able to contribute to the company. Security issues become very important at this time, especially for companies that already have many branches in different locations that require high-performance security systems, because the network interconnections that occur between the head office and branch offices are very vulnerable to attacks from irresponsible parties, The use of IP Security and MAC Address Filtering authentication methods on network devices is very useful to be able to protect, verify and filter company data from enemies on the internet. IP Security authentication provides integrity between connections, then Filtering MAC Address can help the router task to be able to recognize users on the network, So that expected the combination between IP Security and Mac Address Filtering will provide security for every transfer and receive data from Headquarter to branch office, then the company doesn't have to worry about data package being robbed or manipulated by the irresponsible parties.

Published
2020
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33. Academic Information System for Student Leave at the National University: Academic Information System for Student Leave at the National University

Author

Pantoro, Ary Dwi, Darusalam, Ucuk, and Rahman, Ben.

Subjects
Filing Cuti, Student, Model Waterfall
Abstract

Limitations regarding the leave application process at the national university students tend to be effective and efficient because it still uses a manual system that makes students feel difficult. Since the number of files that accumulate leave so as to make the part of academic administration forgot to process when there are students who ask leave of absence. The purpose of this design will generate student leave application program is web based, so as to provide convenience to the user in filing and processing leave. Software system development methods using Waterfall Model. The results of this study will show the main page there is also a facility to leave application, as well as leave application status changes. Through this website, students can leave application process online.

Published
2020

34. Lecture Duty Submission System In National University: Lecture Duty Submission System In National University

Author

Rasyid, Sahrul, Darusalam, Ucuk, and Ningsi, Sari

Subjects
Application for Lecturer Task Load, The task load, ComputingMilieux_COMPUTERSANDEDUCATION, load, Model Waterfall
Abstract

The inefficient process of requesting lecturer workload at national universities tends to be ineffective because it still uses a manual system that makes lecturers feel slow. Due to the large number of other lecturer workload files that accumulate, making operators or HR forget to process when there are lecturers who submit workload sheets. The purpose of designing this system will produce a web-based lecturer workload program so that it makes it easy for lecturers to submit and process lecturer workload sheets. This software system development method uses the Waterfall Model. The results of making this application lecturers can easily make a report of the workload that is directly connected with the people concerned with the report of the workload itself so that the use of paper in making the report of the workload becomes reduced even almost not using the slightest paper.

Published
2020

35. Analysis of Student Active Learning in Moodle LMS Using the SERVQUAL Method: Analysis of Student Active Learning in Moodle LMS Using the SERVQUAL Method

Author

Ali, Haidar, Darusalam, Ucuk, and Iskandar, Agus

Subjects
ComputingMilieux_COMPUTERSANDEDUCATION, Servqual, Level of activity, Students, the LMS Moodle
Abstract

Growth in the use of technology in education in Indonesia is increasing every year. Various universities in Indonesia already have e-learning systems based on LMS moodle. In the e-learning system, teachers and students generally do not meet face to face, so it is difficult to know how enthusiasm and response of students to the subject matter they receive and the success of the teaching and learning system itself. The purpose of this study is to design a system that can analyze the level of student activity. This system was created using PHP and mySQL programming languages as a database and data analysis with the SERVQUAL method. Based on the results of research analysis of learning by using the best ranking servqual method, namely students named Vony Oktavia (193112700650077) with the highest weighting value of 1.57143 out of 30 students.

Published
2020

36. Perancangan Sistem Presensi Untuk Pegawai Dengan RFID Berbasis IoT Menggunakan NodeMCU ESP8266

Author

Nasional University, Informatics Engineering, Aji, Kukuh Prasetiyo, Darusalam, Ucuk, Nathasia, Novi Dian, Nasional University, Informatics Engineering, Aji, Kukuh Prasetiyo, Darusalam, Ucuk, and Nathasia, Novi Dian

Abstract

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

Published
2020

37. Aplikasi Personal Assistant Berbasis Voice Command Pada Sistem Operasi Android Dengan NLP

Author

Constantin, Yoshua, Darusalam, Ucuk, Nathasia, Novi Dian, Constantin, Yoshua, Darusalam, Ucuk, and Nathasia, Novi Dian

Abstract

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.

Published
2020

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