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All Journal JURNAL ITENAS REKAYASA REKA ELKOMIKA TELKOMNIKA (Telecommunication Computing Electronics and Control) Bulletin of Electrical Engineering and Informatics ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika TRANSISTOR Elektro dan Informatika JETT (Jurnal Elektro dan Telekomunikasi Terapan) Indonesian Journal of Electrical Engineering and Computer Science REKA ELKOMIKA: Jurnal Pengabdian kepada Masyarakat
LUCIA JAMBOLA
Institut Teknologi Nasional Bandung
Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

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Perancangan dan Implementasi Reflector Antena Wifi dengan Frekuensi 2,4 GHz YURANDI, NUGRAHA; JAMBOLA, LUCIA; DARLIS, ARSYAD RAMADHAN
REKA ELKOMIKA Vol 1, No 3 (2013)
Publisher : REKA ELKOMIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1194.589 KB)

Abstract

ABSTRAK Saat ini wifi sudah banyak diaplikasikan di berbagai lokasi strategis. Di tempat - tempat tersebut biasanya para pengguna bebas menggunakan akses internet. Bagi yang tempat tinggalnya dekat dengan access point merupakan suatu keuntungan, bagi yang tempat tinggalnya jauh bisa mengakses access point tersebut dengan membangun antena dengan gain yang tinggi sebagai penerima, karena dengan gain yang tinggi maka jangkauan meningkat, salah satu contohnya ada antena directional dengan reflector parabola. Pada penelitian ini dirancang dan diimplementasi antena menggunakan reflector dengan bahan wajan dan kawat. Perancangan dibuat berdasarkan perhitungan rumus secara teoritis terhadap titik fokus reflector dan waveguide, dan diuji dengan kondisi di dalam ruangan dan di luar ruangan. Dari hasil pengukuran dan analisis, diperoleh gain wajanbolic dan gridbolic sama sebesar 17,065 dBi, sedangkan gain berdasarkan teori sebesar 17,18 dBi. Level sinyal wajanbolic sebesar -40,94 dBm ( indoor ) dan -75,38 dBm ( outdoor ) lebih besar dibandingkan level sinyal gridbolic sebesar -47,02 dBm ( indoor ) dan -83 dBm ( outdoor ). Wajanbolic menangkap 16 access point sedangkan gridbolic 14 access point. Dengan demikian wajanbolic lebih unggul dibandingkan gridbolic. Kata kunci : Reflector, Wajanbolic, Gridbolic, Access Point ABSTRACT   Currently wifi is widely applied in various strategic locations. In that place, usually the user is free to use internet access. Those who lived close to the access point is an advantage, for those who have access to their homes far away access point is to build a high gain antenna as a receiver, because when the gain is high then the range increases, there is one example of a directional antenna with a parabolic reflector . In this research, it was designed and implemented the antenna  using a reflector with frying pan and wire materials. The design was based on the calculation of the theory formula for the focal point reflector and waveguide, and tested in the indoor and outdoor conditions. From the measurement and analysis, it has obtained where the wajanbolic and gridbolic had the same gain of 17.065 dBi, while based on the theory the gain was 17.18 dBi. The wajanbolic signal levels were -40.94 dBm wajanbolic (indoor) and -75.38 dBm (outdoor), where it was greater than the gridbolic signal levels as -47.02 dBm (indoor) and -83 dBm (outdoor). The wajanbolic capture was 16 access points while that the gridbolic was 14 access point. Thus the wajanbolic better than the gridbolic.   Keywords : Reflector, Wajanbolic, Gridbolic, Access point
Remotely Garden Irrigation for Residential Area Based on Internet of Things (IoT) Lidyawati, Lita; Kristiana, Lisa; Darlis, Arsyad Ramadhan; Jambola, Lucia; Susana, Ratna
REKA ELKOMIKA: Jurnal Pengabdian kepada Masyarakat Vol 1, No 1 (2020): REKA ELKOMIKA
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaelkomika.v1i1.35-44

Abstract

Activities such as planting and gardening become one of prominent hobbies. An issue of having such well grown plants is the impractical and unachieavable task to monitor 24 hours a day, thus we need a smart gardening system that can monitor the garden on demand. One of the problems in residential gardening systems is how to water the plants while the owner is not at home. Some of people have an adequate knowledge of using IoT to make their life easier. This paper proposes a simple automatic gardening system in watering several plants as programmed. In addition, this system allows human’s manual intervention either locally or remotely via Internet, to control a water pump. To build this smart gardening system, we use Xiaomi home application from Google Play. In this application, we can set the program to water the plants daily with definite time periodic independently.
Security and Watering System Counseling Based on Internet of Things (IoT) in Pondok Hijau Indah Residential Area Lidyawati, Lita; Jambola, Lucia; Darlis, Arsyad Ramadhan; Kristiana, Lisa; Susana, Ratna
REKA ELKOMIKA: Jurnal Pengabdian kepada Masyarakat Vol 1, No 2 (2020): REKA ELKOMIKA
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaelkomika.v1i2.65-74

Abstract

Nowadays, security and gardening systems in densely populated residential areas are generally done manually. The security system in housing sometimes places security posts at street corners that are some distance from citizen’s homes thus they cannot be monitored at all times. Whereas other problem of watering system in citizen’s homes, someone has to water the plants one by one that it is not efficient in  energy, time and water availability thus that it can reduce the quality of the plants. Internet of Things (IoT) is a concept and method for remote control, monitoring, and various tasks. IoT is connected to a network that it can be accessed anywhere which can make things easier. IoT can be used to solve various problems. One of them is security issues and gardening activities. By using smart home technology, the security system is carried out by placing CCTV (Closed Circuit Television) which can be accessed by the home owner, anytime and anywhere the home owner is located. On the other hand, gardening is one of the most popular hobbies. In this field, IoT can be used to monitor and regulate various things to support gardening activities. In this community service activity, we are proposed a simple automatic gardening system for watering some plants programmatically in Pondok Hijau Indah residence. The system also allows manual human intervention either locally or remotely via the internet to control CCTV and water pumps. To build this smart Home system we will use the Xiaomi Home application from Google Play. In this application, we can set a program to control CCTV and water the plants every day at a certain time periodically, in this case, we set every 7 hours to watering the plants. 
Analisis Kinerja Sistem Penyambungan Serat Optik Menggunakan Metoda Fusion Splicing Pada Ruas Soreang - Nanjung Yosi Wismaya; Lucia Jambola
TRANSISTOR Elektro dan Informatika Vol 3, No 1: 2018
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (454.519 KB) | DOI: 10.30659/ei.3.1.62-70

Abstract

Maraknya penggunaan serat optik pada perusahaan yang bergerak dibidang telekomunikasi bertujuan untuk memberikan layanan terbaik, mudah, dan cepat. Dengan menggunakan serat optik, penyedia layanan telekomunikasi dapat menekan biaya sehinga biaya yang diperlukan relatif rendah dengan mutu pelayanan yang tinggi. Namun, dengan berbagai keunggulan serat optik bukan berarti sistem komunikasi serat optik tidak memiliki permasalahan. Salah satu permasalahan yang terjadi pada serat optik adalah hilangnya energi cahaya didalam inti serat optik yang diakibatkan oleh beberapa hal seperti sambungan yang kurang baik, putusnya kabel, atau kualitas kabel yang menurun sehingga mengakibatkan redaman dan rugi – rugi (loss transmission) pada proses pengiriman data. Penyambungan serat optik dilakukan dengan metoda Fusion Splicing. Alat yang digunakan adalah Optical Fiber Fusion Splicer atau yang lebih dikenal dengan Fusion Splicer, alat tersebut yang akan menyambungkan serat optik antara satu inti dengan inti yang lain. Pada ruas Soreang – Nanjung serat optik yang terpasang adalah sepanjang 15,947 km dan memiliki kapasitas sebanyak 24 inti. Kerusakan yang terjadi adalah dikarenakan penggalian pipa oleh pihak lain sehingga kabel terkena perkakas dan terputus. Kemudian dilakukan pengukuran menggunakan Optical Time Domain Reflectometer (OTDR) di stasiun Nanjung dan tercatat kabel serat optik putus pada inti nomor 11 hingga 24 dengan rata – rata jarak yang terukur 15,187 km. Kemudian dilakukan penyambungan serat optik dengan niliai redaman maksimum setiap inti sebesar 0,03 dB.
Light follower systems for visually impaired using visible light communication Arsyad Ramadhan Darlis; Lucia Jambola; Tedi Hadyansyah
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 19, No 1: February 2021
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v19i1.16509

Abstract

Visual impairment is the condition of someone who has a disorder or an obstacle in their vision. In this research, the implementation of light follower systems for visually impaired using visible light is proposed. This system can enable visually impaired people to determine orientation and support mobility, especially in an indoor situation, using visible light. The prototype of the visually impaired pathway was made as visible light communication (VLC) transmitter consisting of a 12 V power supply, light emitting diode (LED), MPEG-1 Layer-3 (MP3), and band pass filter (BPF) filter circuit. The VLC receiver is made a prototype of a blind stick consisting of a photodiode, amplifier, buzzer, timer, and 9 V battery. The measurement of this system uses acrylic and color filters with system accuracy taking into account the angle and conditions when the fluorescent lights are turned on and off. This result showed the system could transmit audio signals at a frequency of 3000 Hz. Furthermore, the comparison results showed that the quality of measurements without using a filter is better than using a filter. The output voltage value without using a filter with an angle of 700 degree is 7.19 Vp-p, meanwhile using a filter with an angle of 700 degree is 6.48 Vp-p.
Digital watermarking image using three-level discrete wavelet transform under attacking noise Lita Lidyawati; Arsyad Ramadhan Darlis; Lucia Jambola; Lisa Kristiana; Rea Ramada Jayandanu
Bulletin of Electrical Engineering and Informatics Vol 11, No 1: February 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v11i1.3565

Abstract

The authentication, identification, and copyright protection can be obtained by constructing the digital image watermarking technique. Watermark robustness and imperceptibility account for the capability of the hidden watermark to survive the manipulation. The proposed paper is a robust algorithm for digital image watermarking with 3-level discrete wavelet transform (DWT) with some attacks method. The 3-level DWT method was used constants α=0.01 and 0.03 as a function of how depth the watermark inserts to the host image in the insertion and extraction process. The algorithm was evaluated using 8 bits per pixel (bpp) grayscale, 1024x1024 pixels for the host image, and 256x256 pixels for the watermark image. The method is also implemented some experimental with attacks such as gaussian, salt and pepper, blurring, and compression. The algorithm is relatively acceptable of good quality, achieves low-value mean squared error (MSE), high peak signals to noise ratio (PSNR), and structural similarity index metric (SSIM) value approach to 1. It is found that the highest image quality measurements by using α=0.03 with the attacking method of salt and pepper yield MSE=0.01, PSNR=45.6 dB and SSIM=0.95, respectively. 
Remotely Garden Irrigation for Residential Area Based on Internet of Things (IoT) Lita Lidyawati; Lisa Kristiana; Arsyad Ramadhan Darlis; Lucia Jambola; Ratna Susana
REKA ELKOMIKA: Jurnal Pengabdian kepada Masyarakat Vol 1, No 1 (2020): REKA ELKOMIKA
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaelkomika.v1i1.35-44

Abstract

Activities such as planting and gardening become one of prominent hobbies. An issue of having such well grown plants is the impractical and unachieavable task to monitor 24 hours a day, thus we need a smart gardening system that can monitor the garden on demand. One of the problems in residential gardening systems is how to water the plants while the owner is not at home. Some of people have an adequate knowledge of using IoT to make their life easier. This paper proposes a simple automatic gardening system in watering several plants as programmed. In addition, this system allows human’s manual intervention either locally or remotely via Internet, to control a water pump. To build this smart gardening system, we use Xiaomi home application from Google Play. In this application, we can set the program to water the plants daily with definite time periodic independently.
Security and Watering System Counseling Based on Internet of Things (IoT) in Pondok Hijau Indah Residential Area Lita Lidyawati; Lucia Jambola; Arsyad Ramadhan Darlis; Lisa Kristiana; Ratna Susana
REKA ELKOMIKA: Jurnal Pengabdian kepada Masyarakat Vol 1, No 2 (2020): REKA ELKOMIKA
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaelkomika.v1i2.65-74

Abstract

Nowadays, security and gardening systems in densely populated residential areas are generally done manually. The security system in housing sometimes places security posts at street corners that are some distance from citizen’s homes thus they cannot be monitored at all times. Whereas other problem of watering system in citizen’s homes, someone has to water the plants one by one that it is not efficient in  energy, time and water availability thus that it can reduce the quality of the plants. Internet of Things (IoT) is a concept and method for remote control, monitoring, and various tasks. IoT is connected to a network that it can be accessed anywhere which can make things easier. IoT can be used to solve various problems. One of them is security issues and gardening activities. By using smart home technology, the security system is carried out by placing CCTV (Closed Circuit Television) which can be accessed by the home owner, anytime and anywhere the home owner is located. On the other hand, gardening is one of the most popular hobbies. In this field, IoT can be used to monitor and regulate various things to support gardening activities. In this community service activity, we are proposed a simple automatic gardening system for watering some plants programmatically in Pondok Hijau Indah residence. The system also allows manual human intervention either locally or remotely via the internet to control CCTV and water pumps. To build this smart Home system we will use the Xiaomi Home application from Google Play. In this application, we can set a program to control CCTV and water the plants every day at a certain time periodically, in this case, we set every 7 hours to watering the plants. 
Optical repeater for indoor visible light communication using amplify-forward method Arsyad Ramadhan Darlis; Lucia Jambola; Lita Lidyawati; Adisty Hanny Asri
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 3: December 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i3.pp1351-1360

Abstract

In this paper, the implementation of an optical repeater for indoor visible light communication using the amplify-forward method was proposed. In indoor, visible light communication (VLC) can occur by transmitting information signals from lamps as a VLC transmitter toward the VLC receiver as line-of-sight (LOS) that is located with only a few meters. In the non-los (NLOS) communication, the signal will be attenuated, so it needs to amplify to improve good signal quality in a VLC receiver. The optical repeater could be used to improve the signal quality that attenuating due to distance. The audio signal was generated and sent using VLC Transmitter toward the light emitting diode (LED). Then, the electrical signal was converted to become visible light, and it was amplified using an optical amplifier with an amplify-forward method. The signal in the form of visible light that had been amplified would be received by the photodiode (PD), and the VLC receiver processed it. The measurement results showed the system that used the optical repeater could improving the distance until 9.5 m with frequency 6000 Hz, where the best signal quality at a frequency of 3000 Hz. The measurement result showed that the use of repeater components with the amplify-forward method for VLC systems, especially in the room, can increase the range until 4.5 m compare without an optical repeater. This result exceeds the minimum distance of an indoor visible light communication system, with an average distance of the roof to the floor is 3.5 m.
SIMULASI ANGGARAN DAYA SISTEM KOMUNIKASI SERAT OPTIK BERBASIS MATLAB 7.5 Lucia Jambola
Jurnal Elektro dan Telekomunikasi Terapan (e-Journal) Vol 3 No 1: JETT Juli (2016)
Publisher : Direktorat Penelitian dan Pengabdian Masyarakat, Universitas Telkom

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (510.078 KB) | DOI: 10.25124/jett.v3i1.135

Abstract

Berkembangnya dunia telekomunikasi membuat kebutuhan akan media transmisi yang dapat menyalurkan informasi dengan kecepatan tinggi, memiliki kapasitas besar dan handal semakin dibutuhkan. Penggunaan kabel serat optik sebagai media transmisi dalam dunia telekomunikasi merupakan salah satu solusi dari berbagai permasalahan diatas. Serat optik mampu meningkatkan pelayanan sistem komunikasi data, suara dan video seperti peningkatan kanal yang tersedia.Sebelum serat optik digunakan dalam sebuah jaringan telekomunikasi perlu dilakukan suatu perhitungan dan analisis anggaran daya untuk mengetahui kualitas, biaya, kelayakan sistem dan kebutuhan komponen Erbium Dopped Fiber Amplifier (EDFA) sehingga sistem komunikasi serat optik tersebut dapat berjalan dengan baik. Pengujian yang dilakukan adalah menghitung anggaran daya pada system komukasi serat optik Bandung – Garut tanpa menggunakan penguat EDFA serta menggunakan penguat EDFA. Untuk mempermudah perencanaan sistem komunikasi serat optik diperlukan simulasi perhitungan anggaran daya menggunakan GUI MATLAB 7.5.
Co-Authors Adisty Hanny Asri ADITYA, MUHAMMAD ILHAM Aloysius Adya Pramudita ARSYAD RAMADHAN DARLIS Cahaya Ramadhan EKARIANI PRATIVI Fauziah, Dini FITRIA DEWI ADRIANI HUSAENI, DZIKRI FACHRI KRISTIANA, LISA LITA LIDYAWATI NUGRAHA YURANDI NURUL WULANDARI POERNOMO TRISAPTO pribadi, aditya arif RATNA SUSANA Rea Ramada Jayandanu REZA WIBISANA RIZKI AL AKHSAN RIZKI HADIANSYAH, RIZKI ROVAN NUGRAHA Tedi Hadyansyah Yosi Wismaya ZUL RAMADHAN